# HG changeset patch
# User amurillo
# Date 1409759528 25200
# Node ID 7430aa5718a5b984d9e0766a5e7f7fe22ea344e5
# Parent  edb5f3b38aabf58e977822a600fc95ac6c3aa14a# Parent  a178c2e6f85f36991460bc2fbcde7bf02daaedb9
Merge

diff -r a178c2e6f85f -r 7430aa5718a5 agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/G1CollectedHeap.java
--- a/agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/G1CollectedHeap.java	Tue Sep 02 11:42:01 2014 -0700
+++ b/agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/G1CollectedHeap.java	Wed Sep 03 08:52:08 2014 -0700
@@ -43,8 +43,8 @@
 // Mirror class for G1CollectedHeap.
 
 public class G1CollectedHeap extends SharedHeap {
-    // HeapRegionSeq _seq;
-    static private long hrsFieldOffset;
+    // HeapRegionManager _hrm;
+    static private long hrmFieldOffset;
     // MemRegion _g1_reserved;
     static private long g1ReservedFieldOffset;
     // size_t _summary_bytes_used;
@@ -67,7 +67,7 @@
     static private synchronized void initialize(TypeDataBase db) {
         Type type = db.lookupType("G1CollectedHeap");
 
-        hrsFieldOffset = type.getField("_hrs").getOffset();
+        hrmFieldOffset = type.getField("_hrm").getOffset();
         summaryBytesUsedField = type.getCIntegerField("_summary_bytes_used");
         g1mmField = type.getAddressField("_g1mm");
         oldSetFieldOffset = type.getField("_old_set").getOffset();
@@ -75,7 +75,7 @@
     }
 
     public long capacity() {
-        return hrs().capacity();
+        return hrm().capacity();
     }
 
     public long used() {
@@ -83,13 +83,13 @@
     }
 
     public long n_regions() {
-        return hrs().length();
+        return hrm().length();
     }
 
-    private HeapRegionSeq hrs() {
-        Address hrsAddr = addr.addOffsetTo(hrsFieldOffset);
-        return (HeapRegionSeq) VMObjectFactory.newObject(HeapRegionSeq.class,
-                                                         hrsAddr);
+    private HeapRegionManager hrm() {
+        Address hrmAddr = addr.addOffsetTo(hrmFieldOffset);
+        return (HeapRegionManager) VMObjectFactory.newObject(HeapRegionManager.class,
+                                                         hrmAddr);
     }
 
     public G1MonitoringSupport g1mm() {
@@ -110,7 +110,7 @@
     }
 
     private Iterator<HeapRegion> heapRegionIterator() {
-        return hrs().heapRegionIterator();
+        return hrm().heapRegionIterator();
     }
 
     public void heapRegionIterate(SpaceClosure scl) {
diff -r a178c2e6f85f -r 7430aa5718a5 agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/HeapRegionManager.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/HeapRegionManager.java	Wed Sep 03 08:52:08 2014 -0700
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+package sun.jvm.hotspot.gc_implementation.g1;
+
+import java.util.Iterator;
+import java.util.Observable;
+import java.util.Observer;
+
+import sun.jvm.hotspot.debugger.Address;
+import sun.jvm.hotspot.runtime.VM;
+import sun.jvm.hotspot.runtime.VMObject;
+import sun.jvm.hotspot.runtime.VMObjectFactory;
+import sun.jvm.hotspot.types.AddressField;
+import sun.jvm.hotspot.types.CIntegerField;
+import sun.jvm.hotspot.types.Type;
+import sun.jvm.hotspot.types.TypeDataBase;
+
+// Mirror class for HeapRegionManager.
+
+public class HeapRegionManager extends VMObject {
+    // G1HeapRegionTable _regions
+    static private long regionsFieldOffset;
+    // uint _committed_length
+    static private CIntegerField numCommittedField;
+
+    static {
+        VM.registerVMInitializedObserver(new Observer() {
+                public void update(Observable o, Object data) {
+                    initialize(VM.getVM().getTypeDataBase());
+                }
+            });
+    }
+
+    static private synchronized void initialize(TypeDataBase db) {
+        Type type = db.lookupType("HeapRegionManager");
+
+        regionsFieldOffset = type.getField("_regions").getOffset();
+        numCommittedField = type.getCIntegerField("_num_committed");
+    }
+
+    private G1HeapRegionTable regions() {
+        Address regionsAddr = addr.addOffsetTo(regionsFieldOffset);
+        return (G1HeapRegionTable) VMObjectFactory.newObject(G1HeapRegionTable.class,
+                                                             regionsAddr);
+    }
+
+    public long capacity() {
+        return length() * HeapRegion.grainBytes();
+    }
+
+    public long length() {
+        return regions().length();
+    }
+
+    public long committedLength() {
+        return numCommittedField.getValue(addr);
+    }
+
+    public Iterator<HeapRegion> heapRegionIterator() {
+        return regions().heapRegionIterator(length());
+    }
+
+    public HeapRegionManager(Address addr) {
+        super(addr);
+    }
+}
diff -r a178c2e6f85f -r 7430aa5718a5 agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/HeapRegionSeq.java
--- a/agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/HeapRegionSeq.java	Tue Sep 02 11:42:01 2014 -0700
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,88 +0,0 @@
-/*
- * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- *
- */
-
-package sun.jvm.hotspot.gc_implementation.g1;
-
-import java.util.Iterator;
-import java.util.Observable;
-import java.util.Observer;
-
-import sun.jvm.hotspot.debugger.Address;
-import sun.jvm.hotspot.runtime.VM;
-import sun.jvm.hotspot.runtime.VMObject;
-import sun.jvm.hotspot.runtime.VMObjectFactory;
-import sun.jvm.hotspot.types.AddressField;
-import sun.jvm.hotspot.types.CIntegerField;
-import sun.jvm.hotspot.types.Type;
-import sun.jvm.hotspot.types.TypeDataBase;
-
-// Mirror class for HeapRegionSeq. It essentially encapsulates the G1HeapRegionTable.
-
-public class HeapRegionSeq extends VMObject {
-    // G1HeapRegionTable _regions
-    static private long regionsFieldOffset;
-    // uint _committed_length
-    static private CIntegerField numCommittedField;
-
-    static {
-        VM.registerVMInitializedObserver(new Observer() {
-                public void update(Observable o, Object data) {
-                    initialize(VM.getVM().getTypeDataBase());
-                }
-            });
-    }
-
-    static private synchronized void initialize(TypeDataBase db) {
-        Type type = db.lookupType("HeapRegionSeq");
-
-        regionsFieldOffset = type.getField("_regions").getOffset();
-        numCommittedField = type.getCIntegerField("_num_committed");
-    }
-
-    private G1HeapRegionTable regions() {
-        Address regionsAddr = addr.addOffsetTo(regionsFieldOffset);
-        return (G1HeapRegionTable) VMObjectFactory.newObject(G1HeapRegionTable.class,
-                                                             regionsAddr);
-    }
-
-    public long capacity() {
-        return length() * HeapRegion.grainBytes();
-    }
-
-    public long length() {
-        return regions().length();
-    }
-
-    public long committedLength() {
-        return numCommittedField.getValue(addr);
-    }
-
-    public Iterator<HeapRegion> heapRegionIterator() {
-        return regions().heapRegionIterator(length());
-    }
-
-    public HeapRegionSeq(Address addr) {
-        super(addr);
-    }
-}
diff -r a178c2e6f85f -r 7430aa5718a5 make/excludeSrc.make
--- a/make/excludeSrc.make	Tue Sep 02 11:42:01 2014 -0700
+++ b/make/excludeSrc.make	Wed Sep 03 08:52:08 2014 -0700
@@ -70,7 +70,8 @@
       CXXFLAGS += -DINCLUDE_CDS=0
       CFLAGS += -DINCLUDE_CDS=0
 
-      Src_Files_EXCLUDE += filemap.cpp metaspaceShared.cpp
+      Src_Files_EXCLUDE += filemap.cpp metaspaceShared*.cpp sharedPathsMiscInfo.cpp \
+        systemDictionaryShared.cpp classLoaderExt.cpp sharedClassUtil.cpp
 endif
 
 ifeq ($(INCLUDE_ALL_GCS), false)
diff -r a178c2e6f85f -r 7430aa5718a5 make/hotspot_version
--- a/make/hotspot_version	Tue Sep 02 11:42:01 2014 -0700
+++ b/make/hotspot_version	Wed Sep 03 08:52:08 2014 -0700
@@ -35,7 +35,7 @@
 
 HS_MAJOR_VER=25
 HS_MINOR_VER=40
-HS_BUILD_NUMBER=08
+HS_BUILD_NUMBER=09
 
 JDK_MAJOR_VER=1
 JDK_MINOR_VER=8
diff -r a178c2e6f85f -r 7430aa5718a5 src/cpu/x86/vm/vm_version_x86.cpp
--- a/src/cpu/x86/vm/vm_version_x86.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/cpu/x86/vm/vm_version_x86.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -612,6 +612,17 @@
 
 #if INCLUDE_RTM_OPT
   if (UseRTMLocking) {
+    if (is_intel_family_core()) {
+      if ((_model == CPU_MODEL_HASWELL_E3) ||
+          (_model == CPU_MODEL_HASWELL_E7 && _stepping < 3) ||
+          (_model == CPU_MODEL_BROADWELL  && _stepping < 4)) {
+        if (!UnlockExperimentalVMOptions) {
+          vm_exit_during_initialization("UseRTMLocking is only available as experimental option on this platform. It must be enabled via -XX:+UnlockExperimentalVMOptions flag.");
+        } else {
+          warning("UseRTMLocking is only available as experimental option on this platform.");
+        }
+      }
+    }
     if (!FLAG_IS_CMDLINE(UseRTMLocking)) {
       // RTM locking should be used only for applications with
       // high lock contention. For now we do not use it by default.
diff -r a178c2e6f85f -r 7430aa5718a5 src/cpu/x86/vm/vm_version_x86.hpp
--- a/src/cpu/x86/vm/vm_version_x86.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/cpu/x86/vm/vm_version_x86.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -276,7 +276,10 @@
     CPU_MODEL_WESTMERE_EX    = 0x2f,
     CPU_MODEL_SANDYBRIDGE    = 0x2a,
     CPU_MODEL_SANDYBRIDGE_EP = 0x2d,
-    CPU_MODEL_IVYBRIDGE_EP   = 0x3a
+    CPU_MODEL_IVYBRIDGE_EP   = 0x3a,
+    CPU_MODEL_HASWELL_E3     = 0x3c,
+    CPU_MODEL_HASWELL_E7     = 0x3f,
+    CPU_MODEL_BROADWELL      = 0x3d
   } cpuExtendedFamily;
 
   // cpuid information block.  All info derived from executing cpuid with
diff -r a178c2e6f85f -r 7430aa5718a5 src/os/linux/vm/os_linux.cpp
--- a/src/os/linux/vm/os_linux.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/os/linux/vm/os_linux.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -2244,7 +2244,7 @@
   const siginfo_t* si = (const siginfo_t*)siginfo;
 
   os::Posix::print_siginfo_brief(st, si);
-
+#if INCLUDE_CDS
   if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
       UseSharedSpaces) {
     FileMapInfo* mapinfo = FileMapInfo::current_info();
@@ -2254,6 +2254,7 @@
                 " possible disk/network problem.");
     }
   }
+#endif
   st->cr();
 }
 
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/classfile/classFileParser.cpp
--- a/src/share/vm/classfile/classFileParser.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/classfile/classFileParser.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -31,6 +31,9 @@
 #include "classfile/javaClasses.hpp"
 #include "classfile/symbolTable.hpp"
 #include "classfile/systemDictionary.hpp"
+#if INCLUDE_CDS
+#include "classfile/systemDictionaryShared.hpp"
+#endif
 #include "classfile/verificationType.hpp"
 #include "classfile/verifier.hpp"
 #include "classfile/vmSymbols.hpp"
@@ -60,6 +63,7 @@
 #include "services/threadService.hpp"
 #include "utilities/array.hpp"
 #include "utilities/globalDefinitions.hpp"
+#include "utilities/ostream.hpp"
 
 // We generally try to create the oops directly when parsing, rather than
 // allocating temporary data structures and copying the bytes twice. A
@@ -3737,7 +3741,15 @@
   instanceKlassHandle nullHandle;
 
   // Figure out whether we can skip format checking (matching classic VM behavior)
-  _need_verify = Verifier::should_verify_for(class_loader(), verify);
+  if (DumpSharedSpaces) {
+    // verify == true means it's a 'remote' class (i.e., non-boot class)
+    // Verification decision is based on BytecodeVerificationRemote flag
+    // for those classes.
+    _need_verify = (verify) ? BytecodeVerificationRemote :
+                              BytecodeVerificationLocal;
+  } else {
+    _need_verify = Verifier::should_verify_for(class_loader(), verify);
+  }
 
   // Set the verify flag in stream
   cfs->set_verify(_need_verify);
@@ -3756,6 +3768,18 @@
   u2 minor_version = cfs->get_u2_fast();
   u2 major_version = cfs->get_u2_fast();
 
+  if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
+    ResourceMark rm;
+    warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
+            major_version,  minor_version, name->as_C_string());
+    Exceptions::fthrow(
+      THREAD_AND_LOCATION,
+      vmSymbols::java_lang_UnsupportedClassVersionError(),
+      "Unsupported major.minor version for dump time %u.%u",
+      major_version,
+      minor_version);
+  }
+
   // Check version numbers - we check this even with verifier off
   if (!is_supported_version(major_version, minor_version)) {
     if (name == NULL) {
@@ -3863,6 +3887,18 @@
       if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
       tty->print_cr("]");
     }
+#if INCLUDE_CDS
+    if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
+      // Only dump the classes that can be stored into CDS archive
+      if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
+        if (name != NULL) {
+          ResourceMark rm(THREAD);
+          classlist_file->print_cr("%s", name->as_C_string());
+          classlist_file->flush();
+        }
+      }
+    }
+#endif
 
     u2 super_class_index = cfs->get_u2_fast();
     instanceKlassHandle super_klass = parse_super_class(super_class_index,
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/classfile/classFileStream.cpp
--- a/src/share/vm/classfile/classFileStream.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/classfile/classFileStream.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,7 +30,7 @@
   THROW_MSG(vmSymbols::java_lang_ClassFormatError(), "Truncated class file");
 }
 
-ClassFileStream::ClassFileStream(u1* buffer, int length, char* source) {
+ClassFileStream::ClassFileStream(u1* buffer, int length, const char* source) {
   _buffer_start = buffer;
   _buffer_end   = buffer + length;
   _current      = buffer;
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/classfile/classFileStream.hpp
--- a/src/share/vm/classfile/classFileStream.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/classfile/classFileStream.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -53,20 +53,20 @@
   u1*   _buffer_start; // Buffer bottom
   u1*   _buffer_end;   // Buffer top (one past last element)
   u1*   _current;      // Current buffer position
-  char* _source;       // Source of stream (directory name, ZIP/JAR archive name)
+  const char* _source; // Source of stream (directory name, ZIP/JAR archive name)
   bool  _need_verify;  // True if verification is on for the class file
 
   void truncated_file_error(TRAPS);
  public:
   // Constructor
-  ClassFileStream(u1* buffer, int length, char* source);
+  ClassFileStream(u1* buffer, int length, const char* source);
 
   // Buffer access
   u1* buffer() const           { return _buffer_start; }
   int length() const           { return _buffer_end - _buffer_start; }
   u1* current() const          { return _current; }
   void set_current(u1* pos)    { _current = pos; }
-  char* source() const         { return _source; }
+  const char* source() const   { return _source; }
   void set_verify(bool flag)   { _need_verify = flag; }
 
   void check_truncated_file(bool b, TRAPS) {
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/classfile/classLoader.cpp
--- a/src/share/vm/classfile/classLoader.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/classfile/classLoader.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -26,8 +26,13 @@
 #include "classfile/classFileParser.hpp"
 #include "classfile/classFileStream.hpp"
 #include "classfile/classLoader.hpp"
+#include "classfile/classLoaderExt.hpp"
 #include "classfile/classLoaderData.inline.hpp"
 #include "classfile/javaClasses.hpp"
+#if INCLUDE_CDS
+#include "classfile/sharedPathsMiscInfo.hpp"
+#include "classfile/sharedClassUtil.hpp"
+#endif
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "compiler/compileBroker.hpp"
@@ -35,6 +40,7 @@
 #include "interpreter/bytecodeStream.hpp"
 #include "interpreter/oopMapCache.hpp"
 #include "memory/allocation.inline.hpp"
+#include "memory/filemap.hpp"
 #include "memory/generation.hpp"
 #include "memory/oopFactory.hpp"
 #include "memory/universe.inline.hpp"
@@ -129,8 +135,12 @@
 
 ClassPathEntry* ClassLoader::_first_entry         = NULL;
 ClassPathEntry* ClassLoader::_last_entry          = NULL;
+int             ClassLoader::_num_entries         = 0;
 PackageHashtable* ClassLoader::_package_hash_table = NULL;
 
+#if INCLUDE_CDS
+SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
+#endif
 // helper routines
 bool string_starts_with(const char* str, const char* str_to_find) {
   size_t str_len = strlen(str);
@@ -194,9 +204,10 @@
   return false;
 }
 
-ClassPathDirEntry::ClassPathDirEntry(char* dir) : ClassPathEntry() {
-  _dir = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
-  strcpy(_dir, dir);
+ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
+  char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
+  strcpy(copy, dir);
+  _dir = copy;
 }
 
 
@@ -209,6 +220,14 @@
   // check if file exists
   struct stat st;
   if (os::stat(path, &st) == 0) {
+#if INCLUDE_CDS
+    if (DumpSharedSpaces) {
+      // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
+      // we should never find a file underneath it -- unless user has added a new file while we are running
+      // the dump, in which case let's quit!
+      ShouldNotReachHere();
+    }
+#endif
     // found file, open it
     int file_handle = os::open(path, 0, 0);
     if (file_handle != -1) {
@@ -232,8 +251,9 @@
 
 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
   _zip = zip;
-  _zip_name = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
-  strcpy(_zip_name, zip_name);
+  char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
+  strcpy(copy, zip_name);
+  _zip_name = copy;
 }
 
 ClassPathZipEntry::~ClassPathZipEntry() {
@@ -243,13 +263,13 @@
   FREE_C_HEAP_ARRAY(char, _zip_name, mtClass);
 }
 
-ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
-  // enable call to C land
+u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
+    // enable call to C land
   JavaThread* thread = JavaThread::current();
   ThreadToNativeFromVM ttn(thread);
   // check whether zip archive contains name
-  jint filesize, name_len;
-  jzentry* entry = (*FindEntry)(_zip, name, &filesize, &name_len);
+  jint name_len;
+  jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
   if (entry == NULL) return NULL;
   u1* buffer;
   char name_buf[128];
@@ -260,19 +280,33 @@
     filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
   }
 
-  // file found, get pointer to class in mmaped jar file.
+  // file found, get pointer to the entry in mmapped jar file.
   if (ReadMappedEntry == NULL ||
       !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
-      // mmaped access not available, perhaps due to compression,
+      // mmapped access not available, perhaps due to compression,
       // read contents into resource array
-      buffer     = NEW_RESOURCE_ARRAY(u1, filesize);
+      int size = (*filesize) + ((nul_terminate) ? 1 : 0);
+      buffer = NEW_RESOURCE_ARRAY(u1, size);
       if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
   }
+
+  // return result
+  if (nul_terminate) {
+    buffer[*filesize] = 0;
+  }
+  return buffer;
+}
+
+ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
+  jint filesize;
+  u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
+  if (buffer == NULL) {
+    return NULL;
+  }
   if (UsePerfData) {
     ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
   }
-  // return result
-  return new ClassFileStream(buffer, filesize, _zip_name);    // Resource allocated
+  return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated
 }
 
 // invoke function for each entry in the zip file
@@ -287,12 +321,13 @@
   }
 }
 
-LazyClassPathEntry::LazyClassPathEntry(char* path, const struct stat* st) : ClassPathEntry() {
+LazyClassPathEntry::LazyClassPathEntry(const char* path, const struct stat* st, bool throw_exception) : ClassPathEntry() {
   _path = strdup(path);
   _st = *st;
   _meta_index = NULL;
   _resolved_entry = NULL;
   _has_error = false;
+  _throw_exception = throw_exception;
 }
 
 bool LazyClassPathEntry::is_jar_file() {
@@ -304,7 +339,11 @@
     return (ClassPathEntry*) _resolved_entry;
   }
   ClassPathEntry* new_entry = NULL;
-  new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, CHECK_NULL);
+  new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, _throw_exception, CHECK_NULL);
+  if (!_throw_exception && new_entry == NULL) {
+    assert(!HAS_PENDING_EXCEPTION, "must be");
+    return NULL;
+  }
   {
     ThreadCritical tc;
     if (_resolved_entry == NULL) {
@@ -338,6 +377,23 @@
   return true;
 }
 
+u1* LazyClassPathEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
+  if (_has_error) {
+    return NULL;
+  }
+  ClassPathEntry* cpe = resolve_entry(THREAD);
+  if (cpe == NULL) {
+    _has_error = true;
+    return NULL;
+  } else if (cpe->is_jar_file()) {
+    return ((ClassPathZipEntry*)cpe)->open_entry(name, filesize, nul_terminate,THREAD);
+  } else {
+    ShouldNotReachHere();
+    *filesize = 0;
+    return NULL;
+  }
+}
+
 static void print_meta_index(LazyClassPathEntry* entry,
                              GrowableArray<char*>& meta_packages) {
   tty->print("[Meta index for %s=", entry->name());
@@ -348,15 +404,62 @@
   tty->print_cr("]");
 }
 
+#if INCLUDE_CDS
+void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
+  assert(DumpSharedSpaces, "only called at dump time");
+  tty->print_cr("Hint: enable -XX:+TraceClassPaths to diagnose the failure");
+  vm_exit_during_initialization(error, message);
+}
+#endif
 
-void ClassLoader::setup_meta_index() {
+void ClassLoader::trace_class_path(const char* msg, const char* name) {
+  if (!TraceClassPaths) {
+    return;
+  }
+
+  if (msg) {
+    tty->print("%s", msg);
+  }
+  if (name) {
+    if (strlen(name) < 256) {
+      tty->print("%s", name);
+    } else {
+      // For very long paths, we need to print each character separately,
+      // as print_cr() has a length limit
+      while (name[0] != '\0') {
+        tty->print("%c", name[0]);
+        name++;
+      }
+    }
+  }
+  if (msg && msg[0] == '[') {
+    tty->print_cr("]");
+  } else {
+    tty->cr();
+  }
+}
+
+void ClassLoader::setup_bootstrap_meta_index() {
   // Set up meta index which allows us to open boot jars lazily if
   // class data sharing is enabled
+  const char* meta_index_path = Arguments::get_meta_index_path();
+  const char* meta_index_dir  = Arguments::get_meta_index_dir();
+  setup_meta_index(meta_index_path, meta_index_dir, 0);
+}
+
+void ClassLoader::setup_meta_index(const char* meta_index_path, const char* meta_index_dir, int start_index) {
   const char* known_version = "% VERSION 2";
-  char* meta_index_path = Arguments::get_meta_index_path();
-  char* meta_index_dir  = Arguments::get_meta_index_dir();
   FILE* file = fopen(meta_index_path, "r");
   int line_no = 0;
+#if INCLUDE_CDS
+  if (DumpSharedSpaces) {
+    if (file != NULL) {
+      _shared_paths_misc_info->add_required_file(meta_index_path);
+    } else {
+      _shared_paths_misc_info->add_nonexist_path(meta_index_path);
+    }
+  }
+#endif
   if (file != NULL) {
     ResourceMark rm;
     LazyClassPathEntry* cur_entry = NULL;
@@ -391,7 +494,7 @@
           // Hand off current packages to current lazy entry (if any)
           if ((cur_entry != NULL) &&
               (boot_class_path_packages.length() > 0)) {
-            if (TraceClassLoading && Verbose) {
+            if ((TraceClassLoading || TraceClassPaths) && Verbose) {
               print_meta_index(cur_entry, boot_class_path_packages);
             }
             MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
@@ -402,8 +505,10 @@
           boot_class_path_packages.clear();
 
           // Find lazy entry corresponding to this jar file
-          for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next()) {
-            if (entry->is_lazy() &&
+          int count = 0;
+          for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next(), count++) {
+            if (count >= start_index &&
+                entry->is_lazy() &&
                 string_starts_with(entry->name(), meta_index_dir) &&
                 string_ends_with(entry->name(), &package_name[2])) {
               cur_entry = (LazyClassPathEntry*) entry;
@@ -440,7 +545,7 @@
     // Hand off current packages to current lazy entry (if any)
     if ((cur_entry != NULL) &&
         (boot_class_path_packages.length() > 0)) {
-      if (TraceClassLoading && Verbose) {
+      if ((TraceClassLoading || TraceClassPaths) && Verbose) {
         print_meta_index(cur_entry, boot_class_path_packages);
       }
       MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
@@ -451,36 +556,90 @@
   }
 }
 
+#if INCLUDE_CDS
+void ClassLoader::check_shared_classpath(const char *path) {
+  if (strcmp(path, "") == 0) {
+    exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
+  }
+
+  struct stat st;
+  if (os::stat(path, &st) == 0) {
+    if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory
+      if (!os::dir_is_empty(path)) {
+        tty->print_cr("Error: non-empty directory '%s'", path);
+        exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
+      }
+    }
+  }
+}
+#endif
+
 void ClassLoader::setup_bootstrap_search_path() {
   assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
-  char* sys_class_path = os::strdup(Arguments::get_sysclasspath());
-  if (TraceClassLoading && Verbose) {
-    tty->print_cr("[Bootstrap loader class path=%s]", sys_class_path);
+  const char* sys_class_path = Arguments::get_sysclasspath();
+  if (PrintSharedArchiveAndExit) {
+    // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
+    // the same as the bootcp of the shared archive.
+  } else {
+    trace_class_path("[Bootstrap loader class path=", sys_class_path);
+  }
+#if INCLUDE_CDS
+  if (DumpSharedSpaces) {
+    _shared_paths_misc_info->add_boot_classpath(sys_class_path);
   }
+#endif
+  setup_search_path(sys_class_path);
+}
 
-  int len = (int)strlen(sys_class_path);
+#if INCLUDE_CDS
+int ClassLoader::get_shared_paths_misc_info_size() {
+  return _shared_paths_misc_info->get_used_bytes();
+}
+
+void* ClassLoader::get_shared_paths_misc_info() {
+  return _shared_paths_misc_info->buffer();
+}
+
+bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
+  SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
+  bool result = checker->check();
+  delete checker;
+  return result;
+}
+#endif
+
+void ClassLoader::setup_search_path(const char *class_path) {
+  int offset = 0;
+  int len = (int)strlen(class_path);
   int end = 0;
 
   // Iterate over class path entries
   for (int start = 0; start < len; start = end) {
-    while (sys_class_path[end] && sys_class_path[end] != os::path_separator()[0]) {
+    while (class_path[end] && class_path[end] != os::path_separator()[0]) {
       end++;
     }
-    char* path = NEW_C_HEAP_ARRAY(char, end-start+1, mtClass);
-    strncpy(path, &sys_class_path[start], end-start);
-    path[end-start] = '\0';
+    EXCEPTION_MARK;
+    ResourceMark rm(THREAD);
+    char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
+    strncpy(path, &class_path[start], end - start);
+    path[end - start] = '\0';
     update_class_path_entry_list(path, false);
-    FREE_C_HEAP_ARRAY(char, path, mtClass);
-    while (sys_class_path[end] == os::path_separator()[0]) {
+#if INCLUDE_CDS
+    if (DumpSharedSpaces) {
+      check_shared_classpath(path);
+    }
+#endif
+    while (class_path[end] == os::path_separator()[0]) {
       end++;
     }
   }
 }
 
-ClassPathEntry* ClassLoader::create_class_path_entry(char *path, const struct stat* st, bool lazy, TRAPS) {
+ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
+                                                     bool lazy, bool throw_exception, TRAPS) {
   JavaThread* thread = JavaThread::current();
   if (lazy) {
-    return new LazyClassPathEntry(path, st);
+    return new LazyClassPathEntry(path, st, throw_exception);
   }
   ClassPathEntry* new_entry = NULL;
   if ((st->st_mode & S_IFREG) == S_IFREG) {
@@ -489,7 +648,11 @@
     char canonical_path[JVM_MAXPATHLEN];
     if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
       // This matches the classic VM
-      THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
+      if (throw_exception) {
+        THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
+      } else {
+        return NULL;
+      }
     }
     char* error_msg = NULL;
     jzfile* zip;
@@ -501,7 +664,7 @@
     }
     if (zip != NULL && error_msg == NULL) {
       new_entry = new ClassPathZipEntry(zip, path);
-      if (TraceClassLoading) {
+      if (TraceClassLoading || TraceClassPaths) {
         tty->print_cr("[Opened %s]", path);
       }
     } else {
@@ -515,12 +678,16 @@
         msg = NEW_RESOURCE_ARRAY(char, len); ;
         jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
       }
-      THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
+      if (throw_exception) {
+        THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
+      } else {
+        return NULL;
+      }
     }
   } else {
     // Directory
     new_entry = new ClassPathDirEntry(path);
-    if (TraceClassLoading) {
+    if (TraceClassLoading || TraceClassPaths) {
       tty->print_cr("[Path %s]", path);
     }
   }
@@ -535,11 +702,8 @@
   struct stat st;
   if (os::stat(path, &st) == 0) {
     if ((st.st_mode & S_IFREG) == S_IFREG) {
-      char orig_path[JVM_MAXPATHLEN];
       char canonical_path[JVM_MAXPATHLEN];
-
-      strcpy(orig_path, path);
-      if (get_canonical_path(orig_path, canonical_path, JVM_MAXPATHLEN)) {
+      if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
         char* error_msg = NULL;
         jzfile* zip;
         {
@@ -581,23 +745,37 @@
       _last_entry = new_entry;
     }
   }
+  _num_entries ++;
 }
 
-void ClassLoader::update_class_path_entry_list(char *path,
-                                               bool check_for_duplicates) {
+// Returns true IFF the file/dir exists and the entry was successfully created.
+bool ClassLoader::update_class_path_entry_list(const char *path,
+                                               bool check_for_duplicates,
+                                               bool throw_exception) {
   struct stat st;
   if (os::stat(path, &st) == 0) {
     // File or directory found
     ClassPathEntry* new_entry = NULL;
     Thread* THREAD = Thread::current();
-    new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, CHECK);
+    new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, throw_exception, CHECK_(false));
+    if (new_entry == NULL) {
+      return false;
+    }
     // The kernel VM adds dynamically to the end of the classloader path and
     // doesn't reorder the bootclasspath which would break java.lang.Package
     // (see PackageInfo).
     // Add new entry to linked list
     if (!check_for_duplicates || !contains_entry(new_entry)) {
-      add_to_list(new_entry);
+      ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
     }
+    return true;
+  } else {
+#if INCLUDE_CDS
+    if (DumpSharedSpaces) {
+      _shared_paths_misc_info->add_nonexist_path(path);
+    }
+#endif
+    return false;
   }
 }
 
@@ -749,10 +927,10 @@
     assert(n == number_of_entries(), "just checking");
   }
 
-  void copy_table(char** top, char* end, PackageHashtable* table);
+  CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);)
 };
 
-
+#if INCLUDE_CDS
 void PackageHashtable::copy_table(char** top, char* end,
                                   PackageHashtable* table) {
   // Copy (relocate) the table to the shared space.
@@ -760,33 +938,30 @@
 
   // Calculate the space needed for the package name strings.
   int i;
-  int n = 0;
-  for (i = 0; i < table_size(); ++i) {
-    for (PackageInfo* pp = table->bucket(i);
-                      pp != NULL;
-                      pp = pp->next()) {
-      n += (int)(strlen(pp->pkgname()) + 1);
-    }
-  }
-  if (*top + n + sizeof(intptr_t) >= end) {
-    report_out_of_shared_space(SharedMiscData);
-  }
-
-  // Copy the table data (the strings) to the shared space.
-  n = align_size_up(n, sizeof(HeapWord));
-  *(intptr_t*)(*top) = n;
-  *top += sizeof(intptr_t);
+  intptr_t* tableSize = (intptr_t*)(*top);
+  *top += sizeof(intptr_t);  // For table size
+  char* tableStart = *top;
 
   for (i = 0; i < table_size(); ++i) {
     for (PackageInfo* pp = table->bucket(i);
                       pp != NULL;
                       pp = pp->next()) {
       int n1 = (int)(strlen(pp->pkgname()) + 1);
+      if (*top + n1 >= end) {
+        report_out_of_shared_space(SharedMiscData);
+      }
       pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1));
       *top += n1;
     }
   }
   *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord));
+  if (*top >= end) {
+    report_out_of_shared_space(SharedMiscData);
+  }
+
+  // Write table size
+  intptr_t len = *top - (char*)tableStart;
+  *tableSize = len;
 }
 
 
@@ -797,7 +972,7 @@
 void ClassLoader::copy_package_info_table(char** top, char* end) {
   _package_hash_table->copy_table(top, end, _package_hash_table);
 }
-
+#endif
 
 PackageInfo* ClassLoader::lookup_package(const char *pkgname) {
   const char *cp = strrchr(pkgname, '/');
@@ -890,7 +1065,8 @@
 
 instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) {
   ResourceMark rm(THREAD);
-  EventMark m("loading class %s", h_name->as_C_string());
+  const char* class_name = h_name->as_C_string();
+  EventMark m("loading class %s", class_name);
   ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
 
   stringStream st;
@@ -898,18 +1074,24 @@
   // st.print("%s.class", h_name->as_utf8());
   st.print_raw(h_name->as_utf8());
   st.print_raw(".class");
-  char* name = st.as_string();
+  const char* file_name = st.as_string();
+  ClassLoaderExt::Context context(class_name, file_name, THREAD);
 
   // Lookup stream for parsing .class file
   ClassFileStream* stream = NULL;
   int classpath_index = 0;
+  ClassPathEntry* e = NULL;
+  instanceKlassHandle h;
   {
     PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(),
                                ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(),
                                PerfClassTraceTime::CLASS_LOAD);
-    ClassPathEntry* e = _first_entry;
+    e = _first_entry;
     while (e != NULL) {
-      stream = e->open_stream(name, CHECK_NULL);
+      stream = e->open_stream(file_name, CHECK_NULL);
+      if (!context.check(stream, classpath_index)) {
+        return h; // NULL
+      }
       if (stream != NULL) {
         break;
       }
@@ -918,9 +1100,7 @@
     }
   }
 
-  instanceKlassHandle h;
   if (stream != NULL) {
-
     // class file found, parse it
     ClassFileParser parser(stream);
     ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
@@ -930,12 +1110,19 @@
                                                        loader_data,
                                                        protection_domain,
                                                        parsed_name,
-                                                       false,
-                                                       CHECK_(h));
-
-    // add to package table
-    if (add_package(name, classpath_index, THREAD)) {
-      h = result;
+                                                       context.should_verify(classpath_index),
+                                                       THREAD);
+    if (HAS_PENDING_EXCEPTION) {
+      ResourceMark rm;
+      if (DumpSharedSpaces) {
+        tty->print_cr("Preload Error: Failed to load %s", class_name);
+      }
+      return h;
+    }
+    h = context.record_result(classpath_index, e, result, THREAD);
+  } else {
+    if (DumpSharedSpaces) {
+      tty->print_cr("Preload Error: Cannot find %s", class_name);
     }
   }
 
@@ -1030,14 +1217,27 @@
 
   // lookup zip library entry points
   load_zip_library();
+#if INCLUDE_CDS
   // initialize search path
+  if (DumpSharedSpaces) {
+    _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
+  }
+#endif
   setup_bootstrap_search_path();
   if (LazyBootClassLoader) {
     // set up meta index which makes boot classpath initialization lazier
-    setup_meta_index();
+    setup_bootstrap_meta_index();
   }
 }
 
+#if INCLUDE_CDS
+void ClassLoader::initialize_shared_path() {
+  if (DumpSharedSpaces) {
+    ClassLoaderExt::setup_search_paths();
+    _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
+  }
+}
+#endif
 
 jlong ClassLoader::classloader_time_ms() {
   return UsePerfData ?
@@ -1081,11 +1281,17 @@
 }
 
 
-bool ClassLoader::get_canonical_path(char* orig, char* out, int len) {
+bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
   assert(orig != NULL && out != NULL && len > 0, "bad arguments");
   if (CanonicalizeEntry != NULL) {
-    JNIEnv* env = JavaThread::current()->jni_environment();
-    if ((CanonicalizeEntry)(env, os::native_path(orig), out, len) < 0) {
+    JavaThread* THREAD = JavaThread::current();
+    JNIEnv* env = THREAD->jni_environment();
+    ResourceMark rm(THREAD);
+
+    // os::native_path writes into orig_copy
+    char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
+    strcpy(orig_copy, orig);
+    if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
       return false;
     }
   } else {
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/classfile/classLoader.hpp
--- a/src/share/vm/classfile/classLoader.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/classfile/classLoader.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -72,11 +72,11 @@
 
 class ClassPathDirEntry: public ClassPathEntry {
  private:
-  char* _dir;           // Name of directory
+  const char* _dir;           // Name of directory
  public:
   bool is_jar_file()  { return false;  }
   const char* name()  { return _dir; }
-  ClassPathDirEntry(char* dir);
+  ClassPathDirEntry(const char* dir);
   ClassFileStream* open_stream(const char* name, TRAPS);
   // Debugging
   NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
@@ -100,13 +100,14 @@
 
 class ClassPathZipEntry: public ClassPathEntry {
  private:
-  jzfile* _zip;        // The zip archive
-  char*   _zip_name;   // Name of zip archive
+  jzfile* _zip;              // The zip archive
+  const char*   _zip_name;   // Name of zip archive
  public:
   bool is_jar_file()  { return true;  }
   const char* name()  { return _zip_name; }
   ClassPathZipEntry(jzfile* zip, const char* zip_name);
   ~ClassPathZipEntry();
+  u1* open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS);
   ClassFileStream* open_stream(const char* name, TRAPS);
   void contents_do(void f(const char* name, void* context), void* context);
   // Debugging
@@ -122,16 +123,18 @@
 // For lazier loading of boot class path entries
 class LazyClassPathEntry: public ClassPathEntry {
  private:
-  char* _path; // dir or file
+  const char* _path; // dir or file
   struct stat _st;
   MetaIndex* _meta_index;
   bool _has_error;
+  bool _throw_exception;
   volatile ClassPathEntry* _resolved_entry;
   ClassPathEntry* resolve_entry(TRAPS);
  public:
   bool is_jar_file();
   const char* name()  { return _path; }
-  LazyClassPathEntry(char* path, const struct stat* st);
+  LazyClassPathEntry(const char* path, const struct stat* st, bool throw_exception);
+  u1* open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS);
   ClassFileStream* open_stream(const char* name, TRAPS);
   void set_meta_index(MetaIndex* meta_index) { _meta_index = meta_index; }
   virtual bool is_lazy();
@@ -142,6 +145,7 @@
 
 class PackageHashtable;
 class PackageInfo;
+class SharedPathsMiscInfo;
 template <MEMFLAGS F> class HashtableBucket;
 
 class ClassLoader: AllStatic {
@@ -149,7 +153,7 @@
   enum SomeConstants {
     package_hash_table_size = 31  // Number of buckets
   };
- private:
+ protected:
   friend class LazyClassPathEntry;
 
   // Performance counters
@@ -191,10 +195,15 @@
   static ClassPathEntry* _first_entry;
   // Last entry in linked list of ClassPathEntry instances
   static ClassPathEntry* _last_entry;
+  static int _num_entries;
+
   // Hash table used to keep track of loaded packages
   static PackageHashtable* _package_hash_table;
   static const char* _shared_archive;
 
+  // Info used by CDS
+  CDS_ONLY(static SharedPathsMiscInfo * _shared_paths_misc_info;)
+
   // Hash function
   static unsigned int hash(const char *s, int n);
   // Returns the package file name corresponding to the specified package
@@ -205,19 +214,23 @@
   static bool add_package(const char *pkgname, int classpath_index, TRAPS);
 
   // Initialization
-  static void setup_meta_index();
+  static void setup_bootstrap_meta_index();
+  static void setup_meta_index(const char* meta_index_path, const char* meta_index_dir,
+                               int start_index);
   static void setup_bootstrap_search_path();
+  static void setup_search_path(const char *class_path);
+
   static void load_zip_library();
-  static ClassPathEntry* create_class_path_entry(char *path, const struct stat* st,
-                                                 bool lazy, TRAPS);
+  static ClassPathEntry* create_class_path_entry(const char *path, const struct stat* st,
+                                                 bool lazy, bool throw_exception, TRAPS);
 
   // Canonicalizes path names, so strcmp will work properly. This is mainly
   // to avoid confusing the zip library
-  static bool get_canonical_path(char* orig, char* out, int len);
+  static bool get_canonical_path(const char* orig, char* out, int len);
  public:
-  // Used by the kernel jvm.
-  static void update_class_path_entry_list(char *path,
-                                           bool check_for_duplicates);
+  static bool update_class_path_entry_list(const char *path,
+                                           bool check_for_duplicates,
+                                           bool throw_exception=true);
   static void print_bootclasspath();
 
   // Timing
@@ -300,6 +313,7 @@
 
   // Initialization
   static void initialize();
+  CDS_ONLY(static void initialize_shared_path();)
   static void create_package_info_table();
   static void create_package_info_table(HashtableBucket<mtClass> *t, int length,
                                         int number_of_entries);
@@ -314,10 +328,21 @@
     return e;
   }
 
+#if INCLUDE_CDS
   // Sharing dump and restore
   static void copy_package_info_buckets(char** top, char* end);
   static void copy_package_info_table(char** top, char* end);
 
+  static void  check_shared_classpath(const char *path);
+  static void  finalize_shared_paths_misc_info();
+  static int   get_shared_paths_misc_info_size();
+  static void* get_shared_paths_misc_info();
+  static bool  check_shared_paths_misc_info(void* info, int size);
+  static void  exit_with_path_failure(const char* error, const char* message);
+#endif
+
+  static void  trace_class_path(const char* msg, const char* name = NULL);
+
   // VM monitoring and management support
   static jlong classloader_time_ms();
   static jlong class_method_total_size();
@@ -341,7 +366,7 @@
 
   // Force compilation of all methods in all classes in bootstrap class path (stress test)
 #ifndef PRODUCT
- private:
+ protected:
   static int _compile_the_world_class_counter;
   static int _compile_the_world_method_counter;
  public:
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/classfile/classLoaderExt.hpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/classfile/classLoaderExt.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_CLASSFILE_CLASSLOADEREXT_HPP
+#define SHARE_VM_CLASSFILE_CLASSLOADEREXT_HPP
+
+#include "classfile/classLoader.hpp"
+
+class ClassLoaderExt: public ClassLoader { // AllStatic
+public:
+
+  class Context {
+    const char* _file_name;
+  public:
+    Context(const char* class_name, const char* file_name, TRAPS) {
+      _file_name = file_name;
+    }
+
+    bool check(ClassFileStream* stream, const int classpath_index) {
+      return true;
+    }
+
+    bool should_verify(int classpath_index) {
+      return false;
+    }
+
+    instanceKlassHandle record_result(const int classpath_index,
+                                      ClassPathEntry* e, instanceKlassHandle result, TRAPS) {
+      if (ClassLoader::add_package(_file_name, classpath_index, THREAD)) {
+        if (DumpSharedSpaces) {
+          result->set_shared_classpath_index(classpath_index);
+        }
+        return result;
+      } else {
+        return instanceKlassHandle(); // NULL
+      }
+    }
+  };
+
+
+  static void add_class_path_entry(const char* path, bool check_for_duplicates,
+                                   ClassPathEntry* new_entry) {
+    ClassLoader::add_to_list(new_entry);
+  }
+  static void setup_search_paths() {}
+};
+
+#endif // SHARE_VM_CLASSFILE_CLASSLOADEREXT_HPP
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/classfile/dictionary.cpp
--- a/src/share/vm/classfile/dictionary.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/classfile/dictionary.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -209,6 +209,29 @@
   _pd_cache_table->roots_oops_do(strong, weak);
 }
 
+void Dictionary::remove_classes_in_error_state() {
+  assert(DumpSharedSpaces, "supported only when dumping");
+  DictionaryEntry* probe = NULL;
+  for (int index = 0; index < table_size(); index++) {
+    for (DictionaryEntry** p = bucket_addr(index); *p != NULL; ) {
+      probe = *p;
+      InstanceKlass* ik = InstanceKlass::cast(probe->klass());
+      if (ik->is_in_error_state()) { // purge this entry
+        *p = probe->next();
+        if (probe == _current_class_entry) {
+          _current_class_entry = NULL;
+        }
+        free_entry(probe);
+        ResourceMark rm;
+        tty->print_cr("Removed error class: %s", ik->external_name());
+        continue;
+      }
+
+      p = probe->next_addr();
+    }
+  }
+}
+
 void Dictionary::always_strong_oops_do(OopClosure* blk) {
   // Follow all system classes and temporary placeholders in dictionary; only
   // protection domain oops contain references into the heap. In a first
@@ -682,16 +705,17 @@
 
 
 // ----------------------------------------------------------------------------
-#ifndef PRODUCT
 
-void Dictionary::print() {
+void Dictionary::print(bool details) {
   ResourceMark rm;
   HandleMark   hm;
 
-  tty->print_cr("Java system dictionary (table_size=%d, classes=%d)",
-                 table_size(), number_of_entries());
-  tty->print_cr("^ indicates that initiating loader is different from "
-                "defining loader");
+  if (details) {
+    tty->print_cr("Java system dictionary (table_size=%d, classes=%d)",
+                   table_size(), number_of_entries());
+    tty->print_cr("^ indicates that initiating loader is different from "
+                  "defining loader");
+  }
 
   for (int index = 0; index < table_size(); index++) {
     for (DictionaryEntry* probe = bucket(index);
@@ -702,21 +726,28 @@
       ClassLoaderData* loader_data =  probe->loader_data();
       bool is_defining_class =
          (loader_data == InstanceKlass::cast(e)->class_loader_data());
-      tty->print("%s%s", is_defining_class ? " " : "^",
+      tty->print("%s%s", ((!details) || is_defining_class) ? " " : "^",
                    e->external_name());
 
+      if (details) {
         tty->print(", loader ");
-      loader_data->print_value();
+        if (loader_data != NULL) {
+          loader_data->print_value();
+        } else {
+          tty->print("NULL");
+        }
+      }
       tty->cr();
     }
   }
-  tty->cr();
-  _pd_cache_table->print();
+
+  if (details) {
+    tty->cr();
+    _pd_cache_table->print();
+  }
   tty->cr();
 }
 
-#endif
-
 void Dictionary::verify() {
   guarantee(number_of_entries() >= 0, "Verify of system dictionary failed");
 
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/classfile/dictionary.hpp
--- a/src/share/vm/classfile/dictionary.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/classfile/dictionary.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -100,6 +100,7 @@
   void methods_do(void f(Method*));
 
   void unlink(BoolObjectClosure* is_alive);
+  void remove_classes_in_error_state();
 
   // Classes loaded by the bootstrap loader are always strongly reachable.
   // If we're not doing class unloading, all classes are strongly reachable.
@@ -126,9 +127,7 @@
 
   ProtectionDomainCacheEntry* cache_get(oop protection_domain);
 
-#ifndef PRODUCT
-  void print();
-#endif
+  void print(bool details = true);
   void verify();
 };
 
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/classfile/sharedClassUtil.hpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/classfile/sharedClassUtil.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_CLASSFILE_SHAREDCLASSUTIL_HPP
+#define SHARE_VM_CLASSFILE_SHAREDCLASSUTIL_HPP
+
+#include "classfile/sharedPathsMiscInfo.hpp"
+#include "memory/filemap.hpp"
+
+class SharedClassUtil : AllStatic {
+public:
+
+  static SharedPathsMiscInfo* allocate_shared_paths_misc_info() {
+    return new SharedPathsMiscInfo();
+  }
+
+  static SharedPathsMiscInfo* allocate_shared_paths_misc_info(char* buf, int size) {
+    return new SharedPathsMiscInfo(buf, size);
+  }
+
+  static FileMapInfo::FileMapHeader* allocate_file_map_header() {
+    return new FileMapInfo::FileMapHeader();
+  }
+
+  static size_t file_map_header_size() {
+    return sizeof(FileMapInfo::FileMapHeader);
+  }
+
+  static size_t shared_class_path_entry_size() {
+    return sizeof(SharedClassPathEntry);
+  }
+
+  static void update_shared_classpath(ClassPathEntry *cpe,
+                                      SharedClassPathEntry* ent,
+                                      time_t timestamp,
+                                      long filesize, TRAPS) {
+    ent->_timestamp = timestamp;
+    ent->_filesize  = filesize;
+  }
+
+  static void initialize(TRAPS) {}
+
+  inline static bool is_shared_boot_class(Klass* klass) {
+    return (klass->_shared_class_path_index >= 0);
+  }
+};
+
+#endif // SHARE_VM_CLASSFILE_SHAREDCLASSUTIL_HPP
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/classfile/sharedPathsMiscInfo.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/classfile/sharedPathsMiscInfo.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "classfile/classLoader.hpp"
+#include "classfile/classLoaderData.inline.hpp"
+#include "classfile/sharedPathsMiscInfo.hpp"
+#include "memory/allocation.inline.hpp"
+#include "memory/metaspaceShared.hpp"
+#include "runtime/arguments.hpp"
+
+void SharedPathsMiscInfo::add_path(const char* path, int type) {
+  if (TraceClassPaths) {
+    tty->print("[type=%s] ", type_name(type));
+    trace_class_path("[Add misc shared path ", path);
+  }
+  write(path, strlen(path) + 1);
+  write_jint(jint(type));
+}
+
+void SharedPathsMiscInfo::ensure_size(size_t needed_bytes) {
+  assert(_allocated, "cannot modify buffer during validation.");
+  int used = get_used_bytes();
+  int target = used + int(needed_bytes);
+  if (target > _buf_size) {
+    _buf_size = _buf_size * 2 + (int)needed_bytes;
+    _buf_start = REALLOC_C_HEAP_ARRAY(char, _buf_start, _buf_size, mtClass);
+    _cur_ptr = _buf_start + used;
+    _end_ptr = _buf_start + _buf_size;
+  }
+}
+
+void SharedPathsMiscInfo::write(const void* ptr, size_t size) {
+  ensure_size(size);
+  memcpy(_cur_ptr, ptr, size);
+  _cur_ptr += size;
+}
+
+bool SharedPathsMiscInfo::read(void* ptr, size_t size) {
+  if (_cur_ptr + size <= _end_ptr) {
+    memcpy(ptr, _cur_ptr, size);
+    _cur_ptr += size;
+    return true;
+  }
+  return false;
+}
+
+bool SharedPathsMiscInfo::fail(const char* msg, const char* name) {
+  ClassLoader::trace_class_path(msg, name);
+  MetaspaceShared::set_archive_loading_failed();
+  return false;
+}
+
+bool SharedPathsMiscInfo::check() {
+  // The whole buffer must be 0 terminated so that we can use strlen and strcmp
+  // without fear.
+  _end_ptr -= sizeof(jint);
+  if (_cur_ptr >= _end_ptr) {
+    return fail("Truncated archive file header");
+  }
+  if (*_end_ptr != 0) {
+    return fail("Corrupted archive file header");
+  }
+
+  while (_cur_ptr < _end_ptr) {
+    jint type;
+    const char* path = _cur_ptr;
+    _cur_ptr += strlen(path) + 1;
+    if (!read_jint(&type)) {
+      return fail("Corrupted archive file header");
+    }
+    if (TraceClassPaths) {
+      tty->print("[type=%s ", type_name(type));
+      print_path(tty, type, path);
+      tty->print_cr("]");
+    }
+    if (!check(type, path)) {
+      if (!PrintSharedArchiveAndExit) {
+        return false;
+      }
+    } else {
+      trace_class_path("[ok");
+    }
+  }
+
+  return true;
+}
+
+bool SharedPathsMiscInfo::check(jint type, const char* path) {
+  switch (type) {
+  case BOOT:
+    if (strcmp(path, Arguments::get_sysclasspath()) != 0) {
+      return fail("[BOOT classpath mismatch, actual: -Dsun.boot.class.path=", Arguments::get_sysclasspath());
+    }
+    break;
+  case NON_EXIST: // fall-through
+  case REQUIRED:
+    {
+      struct stat st;
+      if (os::stat(path, &st) != 0) {
+        // The file does not actually exist
+        if (type == REQUIRED) {
+          // but we require it to exist -> fail
+          return fail("Required file doesn't exist");
+        }
+      } else {
+        // The file actually exists
+        if (type == NON_EXIST) {
+          // But we want it to not exist -> fail
+          return fail("File must not exist");
+        }
+        time_t    timestamp;
+        long      filesize;
+
+        if (!read_time(&timestamp) || !read_long(&filesize)) {
+          return fail("Corrupted archive file header");
+        }
+        if (timestamp != st.st_mtime) {
+          return fail("Timestamp mismatch");
+        }
+        if (filesize != st.st_size) {
+          return fail("File size mismatch");
+        }
+      }
+    }
+    break;
+
+  default:
+    return fail("Corrupted archive file header");
+  }
+
+  return true;
+}
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/classfile/sharedPathsMiscInfo.hpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/classfile/sharedPathsMiscInfo.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -0,0 +1,187 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_CLASSFILE_SHAREDPATHSMISCINFO_HPP
+#define SHARE_VM_CLASSFILE_SHAREDPATHSMISCINFO_HPP
+
+#include "runtime/os.hpp"
+
+// During dumping time, when processing class paths, we build up the dump-time
+// classpath. The JAR files that exist are stored in the list ClassLoader::_first_entry.
+// However, we need to store other "misc" information for run-time checking, such as
+//
+// + The values of Arguments::get_sysclasspath() used during dumping.
+//
+// + The meta-index file(s) used during dumping (incl modification time and size)
+//
+// + The class path elements specified during dumping but did not exist --
+//   these elements must also be specified at run time, and they also must not
+//   exist at run time.
+//
+// These misc items are stored in a linear buffer in SharedPathsMiscInfo.
+// The storage format is stream oriented to minimize its size.
+//
+// When writing the information to the archive file, SharedPathsMiscInfo is stored in
+// the archive file header. At run-time, this information is used only during initialization
+// (accessed using read() instead of mmap()), and is deallocated afterwards to save space.
+//
+// The SharedPathsMiscInfo class is used for both creating the the information (during
+// dumping time) and validation (at run time). Different constructors are used in the
+// two situations. See below.
+
+class SharedPathsMiscInfo : public CHeapObj<mtClass> {
+protected:
+  char* _buf_start;
+  char* _cur_ptr;
+  char* _end_ptr;
+  int   _buf_size;
+  bool  _allocated;   // was _buf_start allocated by me?
+  void ensure_size(size_t needed_bytes);
+  void add_path(const char* path, int type);
+
+  void write(const void* ptr, size_t size);
+  bool read(void* ptr, size_t size);
+
+  static void trace_class_path(const char* msg, const char* name = NULL) {
+    ClassLoader::trace_class_path(msg, name);
+  }
+protected:
+  static bool fail(const char* msg, const char* name = NULL);
+  virtual bool check(jint type, const char* path);
+
+public:
+  enum {
+    INITIAL_BUF_SIZE = 128
+  };
+  // This constructor is used when creating the misc information (during dump)
+  SharedPathsMiscInfo() {
+    _buf_size = INITIAL_BUF_SIZE;
+    _cur_ptr = _buf_start = NEW_C_HEAP_ARRAY(char, _buf_size, mtClass);
+    _allocated = true;
+  }
+  // This constructor is used when validating the misc info (during run time)
+  SharedPathsMiscInfo(char *buff, int size) {
+    _cur_ptr = _buf_start = buff;
+    _end_ptr = _buf_start + size;
+    _buf_size = size;
+    _allocated = false;
+  }
+  ~SharedPathsMiscInfo() {
+    if (_allocated) {
+      FREE_C_HEAP_ARRAY(char, _buf_start, mtClass);
+    }
+  }
+  int get_used_bytes() {
+    return _cur_ptr - _buf_start;
+  }
+  void* buffer() {
+    return _buf_start;
+  }
+
+  // writing --
+
+  // The path must not exist at run-time
+  void add_nonexist_path(const char* path) {
+    add_path(path, NON_EXIST);
+  }
+
+  // The path must exist and have required size and modification time
+  void add_required_file(const char* path) {
+    add_path(path, REQUIRED);
+
+    struct stat st;
+    if (os::stat(path, &st) != 0) {
+      assert(0, "sanity");
+      ClassLoader::exit_with_path_failure("failed to os::stat(%s)", path); // should not happen
+    }
+    write_time(st.st_mtime);
+    write_long(st.st_size);
+  }
+
+  // The path must exist, and must contain exactly <num_entries> files/dirs
+  void add_boot_classpath(const char* path) {
+    add_path(path, BOOT);
+  }
+  int write_jint(jint num) {
+    write(&num, sizeof(num));
+    return 0;
+  }
+  void write_time(time_t t) {
+    write(&t, sizeof(t));
+  }
+  void write_long(long l) {
+    write(&l, sizeof(l));
+  }
+
+  bool dump_to_file(int fd) {
+    int n = get_used_bytes();
+    return (os::write(fd, _buf_start, n) == (size_t)n);
+  }
+
+  // reading --
+
+  enum {
+    BOOT      = 1,
+    NON_EXIST = 2,
+    REQUIRED  = 3
+  };
+
+  virtual const char* type_name(int type) {
+    switch (type) {
+    case BOOT:      return "BOOT";
+    case NON_EXIST: return "NON_EXIST";
+    case REQUIRED:  return "REQUIRED";
+    default:        ShouldNotReachHere(); return "?";
+    }
+  }
+
+  virtual void print_path(outputStream* out, int type, const char* path) {
+    switch (type) {
+    case BOOT:
+      out->print("Expecting -Dsun.boot.class.path=%s", path);
+      break;
+    case NON_EXIST:
+      out->print("Expecting that %s does not exist", path);
+      break;
+    case REQUIRED:
+      out->print("Expecting that file %s must exist and is not altered", path);
+      break;
+    default:
+      ShouldNotReachHere();
+    }
+  }
+
+  bool check();
+  bool read_jint(jint *ptr) {
+    return read(ptr, sizeof(jint));
+  }
+  bool read_long(long *ptr) {
+    return read(ptr, sizeof(long));
+  }
+  bool read_time(time_t *ptr) {
+    return read(ptr, sizeof(time_t));
+  }
+};
+
+#endif // SHARE_VM_CLASSFILE_SHAREDPATHSMISCINFO_HPP
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/classfile/systemDictionary.cpp
--- a/src/share/vm/classfile/systemDictionary.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/classfile/systemDictionary.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -30,10 +30,15 @@
 #include "classfile/placeholders.hpp"
 #include "classfile/resolutionErrors.hpp"
 #include "classfile/systemDictionary.hpp"
+#if INCLUDE_CDS
+#include "classfile/sharedClassUtil.hpp"
+#include "classfile/systemDictionaryShared.hpp"
+#endif
 #include "classfile/vmSymbols.hpp"
 #include "compiler/compileBroker.hpp"
 #include "interpreter/bytecodeStream.hpp"
 #include "interpreter/interpreter.hpp"
+#include "memory/filemap.hpp"
 #include "memory/gcLocker.hpp"
 #include "memory/oopFactory.hpp"
 #include "oops/instanceKlass.hpp"
@@ -109,6 +114,8 @@
                          CHECK);
 
   _java_system_loader = (oop)result.get_jobject();
+
+  CDS_ONLY(SystemDictionaryShared::initialize(CHECK);)
 }
 
 
@@ -974,6 +981,7 @@
     // as the host_klass
     assert(EnableInvokeDynamic, "");
     guarantee(host_klass->class_loader() == class_loader(), "should be the same");
+    guarantee(!DumpSharedSpaces, "must not create anonymous classes when dumping");
     loader_data = ClassLoaderData::anonymous_class_loader_data(class_loader(), CHECK_NULL);
     loader_data->record_dependency(host_klass(), CHECK_NULL);
   } else {
@@ -1135,7 +1143,7 @@
   return k();
 }
 
-
+#if INCLUDE_CDS
 void SystemDictionary::set_shared_dictionary(HashtableBucket<mtClass>* t, int length,
                                              int number_of_entries) {
   assert(length == _nof_buckets * sizeof(HashtableBucket<mtClass>),
@@ -1168,15 +1176,21 @@
 instanceKlassHandle SystemDictionary::load_shared_class(
                  Symbol* class_name, Handle class_loader, TRAPS) {
   instanceKlassHandle ik (THREAD, find_shared_class(class_name));
-  return load_shared_class(ik, class_loader, THREAD);
+  // Make sure we only return the boot class for the NULL classloader.
+  if (ik.not_null() &&
+      SharedClassUtil::is_shared_boot_class(ik()) && class_loader.is_null()) {
+    Handle protection_domain;
+    return load_shared_class(ik, class_loader, protection_domain, THREAD);
+  }
+  return instanceKlassHandle();
 }
 
-instanceKlassHandle SystemDictionary::load_shared_class(
-                 instanceKlassHandle ik, Handle class_loader, TRAPS) {
-  assert(class_loader.is_null(), "non-null classloader for shared class?");
+instanceKlassHandle SystemDictionary::load_shared_class(instanceKlassHandle ik,
+                                                        Handle class_loader,
+                                                        Handle protection_domain, TRAPS) {
   if (ik.not_null()) {
     instanceKlassHandle nh = instanceKlassHandle(); // null Handle
-    Symbol*  class_name = ik->name();
+    Symbol* class_name = ik->name();
 
     // Found the class, now load the superclass and interfaces.  If they
     // are shared, add them to the main system dictionary and reset
@@ -1185,7 +1199,7 @@
     if (ik->super() != NULL) {
       Symbol*  cn = ik->super()->name();
       resolve_super_or_fail(class_name, cn,
-                            class_loader, Handle(), true, CHECK_(nh));
+                            class_loader, protection_domain, true, CHECK_(nh));
     }
 
     Array<Klass*>* interfaces = ik->local_interfaces();
@@ -1198,7 +1212,7 @@
       // reinitialized yet (they will be once the interface classes
       // are loaded)
       Symbol*  name  = k->name();
-      resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh));
+      resolve_super_or_fail(class_name, name, class_loader, protection_domain, false, CHECK_(nh));
     }
 
     // Adjust methods to recover missing data.  They need addresses for
@@ -1207,30 +1221,45 @@
 
     // Updating methods must be done under a lock so multiple
     // threads don't update these in parallel
-    // Shared classes are all currently loaded by the bootstrap
-    // classloader, so this will never cause a deadlock on
-    // a custom class loader lock.
+    //
+    // Shared classes are all currently loaded by either the bootstrap or
+    // internal parallel class loaders, so this will never cause a deadlock
+    // on a custom class loader lock.
 
+    ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader());
     {
       Handle lockObject = compute_loader_lock_object(class_loader, THREAD);
       check_loader_lock_contention(lockObject, THREAD);
       ObjectLocker ol(lockObject, THREAD, true);
-      ik->restore_unshareable_info(CHECK_(nh));
+      ik->restore_unshareable_info(loader_data, protection_domain, CHECK_(nh));
     }
 
     if (TraceClassLoading) {
       ResourceMark rm;
       tty->print("[Loaded %s", ik->external_name());
       tty->print(" from shared objects file");
+      if (class_loader.not_null()) {
+        tty->print(" by %s", loader_data->loader_name());
+      }
       tty->print_cr("]");
     }
+
+    if (DumpLoadedClassList != NULL && classlist_file->is_open()) {
+      // Only dump the classes that can be stored into CDS archive
+      if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
+        ResourceMark rm(THREAD);
+        classlist_file->print_cr("%s", ik->name()->as_C_string());
+        classlist_file->flush();
+      }
+    }
+
     // notify a class loaded from shared object
     ClassLoadingService::notify_class_loaded(InstanceKlass::cast(ik()),
                                              true /* shared class */);
   }
   return ik;
 }
-
+#endif // INCLUDE_CDS
 
 instanceKlassHandle SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) {
   instanceKlassHandle nh = instanceKlassHandle(); // null Handle
@@ -1240,8 +1269,10 @@
     // shared spaces.
     instanceKlassHandle k;
     {
+#if INCLUDE_CDS
       PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time());
       k = load_shared_class(class_name, class_loader, THREAD);
+#endif
     }
 
     if (k.is_null()) {
@@ -1600,7 +1631,6 @@
   Universe::flush_dependents_on(k);
 }
 
-
 // ----------------------------------------------------------------------------
 // GC support
 
@@ -1682,6 +1712,7 @@
 void SystemDictionary::roots_oops_do(OopClosure* strong, OopClosure* weak) {
   strong->do_oop(&_java_system_loader);
   strong->do_oop(&_system_loader_lock_obj);
+  CDS_ONLY(SystemDictionaryShared::roots_oops_do(strong);)
 
   // Adjust dictionary
   dictionary()->roots_oops_do(strong, weak);
@@ -1693,6 +1724,7 @@
 void SystemDictionary::oops_do(OopClosure* f) {
   f->do_oop(&_java_system_loader);
   f->do_oop(&_system_loader_lock_obj);
+  CDS_ONLY(SystemDictionaryShared::oops_do(f);)
 
   // Adjust dictionary
   dictionary()->oops_do(f);
@@ -1754,6 +1786,10 @@
   invoke_method_table()->methods_do(f);
 }
 
+void SystemDictionary::remove_classes_in_error_state() {
+  dictionary()->remove_classes_in_error_state();
+}
+
 // ----------------------------------------------------------------------------
 // Lazily load klasses
 
@@ -2566,10 +2602,12 @@
 
 
 // ----------------------------------------------------------------------------
-#ifndef PRODUCT
+void SystemDictionary::print_shared(bool details) {
+  shared_dictionary()->print(details);
+}
 
-void SystemDictionary::print() {
-  dictionary()->print();
+void SystemDictionary::print(bool details) {
+  dictionary()->print(details);
 
   // Placeholders
   GCMutexLocker mu(SystemDictionary_lock);
@@ -2579,7 +2617,6 @@
   constraints()->print();
 }
 
-#endif
 
 void SystemDictionary::verify() {
   guarantee(dictionary() != NULL, "Verify of system dictionary failed");
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/classfile/systemDictionary.hpp
--- a/src/share/vm/classfile/systemDictionary.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/classfile/systemDictionary.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -111,6 +111,7 @@
   do_klass(SecurityManager_klass,                       java_lang_SecurityManager,                 Pre                 ) \
   do_klass(ProtectionDomain_klass,                      java_security_ProtectionDomain,            Pre                 ) \
   do_klass(AccessControlContext_klass,                  java_security_AccessControlContext,        Pre                 ) \
+  do_klass(SecureClassLoader_klass,                     java_security_SecureClassLoader,           Pre                 ) \
   do_klass(ClassNotFoundException_klass,                java_lang_ClassNotFoundException,          Pre                 ) \
   do_klass(NoClassDefFoundError_klass,                  java_lang_NoClassDefFoundError,            Pre                 ) \
   do_klass(LinkageError_klass,                          java_lang_LinkageError,                    Pre                 ) \
@@ -167,6 +168,15 @@
   do_klass(StringBuilder_klass,                         java_lang_StringBuilder,                   Pre                 ) \
   do_klass(misc_Unsafe_klass,                           sun_misc_Unsafe,                           Pre                 ) \
                                                                                                                          \
+  /* support for CDS */                                                                                                  \
+  do_klass(ByteArrayInputStream_klass,                  java_io_ByteArrayInputStream,              Pre                 ) \
+  do_klass(File_klass,                                  java_io_File,                              Pre                 ) \
+  do_klass(URLClassLoader_klass,                        java_net_URLClassLoader,                   Pre                 ) \
+  do_klass(URL_klass,                                   java_net_URL,                              Pre                 ) \
+  do_klass(Jar_Manifest_klass,                          java_util_jar_Manifest,                    Pre                 ) \
+  do_klass(sun_misc_Launcher_klass,                     sun_misc_Launcher,                         Pre                 ) \
+  do_klass(CodeSource_klass,                            java_security_CodeSource,                  Pre                 ) \
+                                                                                                                         \
   /* It's NULL in non-1.4 JDKs. */                                                                                       \
   do_klass(StackTraceElement_klass,                     java_lang_StackTraceElement,               Opt                 ) \
   /* Universe::is_gte_jdk14x_version() is not set up by this point. */                                                   \
@@ -226,7 +236,7 @@
   static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
   // Convenient call for null loader and protection domain.
   static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
-private:
+protected:
   // handle error translation for resolve_or_null results
   static Klass* handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
 
@@ -331,6 +341,9 @@
   // loaders.  Returns "true" iff something was unloaded.
   static bool do_unloading(BoolObjectClosure* is_alive);
 
+  // Used by DumpSharedSpaces only to remove classes that failed verification
+  static void remove_classes_in_error_state();
+
   static int calculate_systemdictionary_size(int loadedclasses);
 
   // Applies "f->do_oop" to all root oops in the system dictionary.
@@ -340,7 +353,7 @@
   // System loader lock
   static oop system_loader_lock()           { return _system_loader_lock_obj; }
 
-private:
+protected:
   // Extended Redefine classes support (tbi)
   static void preloaded_classes_do(KlassClosure* f);
   static void lazily_loaded_classes_do(KlassClosure* f);
@@ -353,7 +366,8 @@
   static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length,
                                     int number_of_entries);
   // Printing
-  static void print()                   PRODUCT_RETURN;
+  static void print(bool details = true);
+  static void print_shared(bool details = true);
   static void print_class_statistics()  PRODUCT_RETURN;
   static void print_method_statistics() PRODUCT_RETURN;
 
@@ -439,7 +453,7 @@
 
   static void load_abstract_ownable_synchronizer_klass(TRAPS);
 
-private:
+protected:
   // Tells whether ClassLoader.loadClassInternal is present
   static bool has_loadClassInternal()       { return _has_loadClassInternal; }
 
@@ -467,7 +481,7 @@
 
   // Register a new class loader
   static ClassLoaderData* register_loader(Handle class_loader, TRAPS);
-private:
+protected:
   // Mirrors for primitive classes (created eagerly)
   static oop check_mirror(oop m) {
     assert(m != NULL, "mirror not initialized");
@@ -536,7 +550,7 @@
   static void delete_resolution_error(ConstantPool* pool);
   static Symbol* find_resolution_error(constantPoolHandle pool, int which);
 
- private:
+ protected:
 
   enum Constants {
     _loader_constraint_size = 107,                     // number of entries in constraint table
@@ -587,7 +601,7 @@
   friend class CounterDecay;
   static Klass* try_get_next_class();
 
-private:
+protected:
   static void validate_protection_domain(instanceKlassHandle klass,
                                          Handle class_loader,
                                          Handle protection_domain, TRAPS);
@@ -614,10 +628,10 @@
   static instanceKlassHandle find_or_define_instance_class(Symbol* class_name,
                                                 Handle class_loader,
                                                 instanceKlassHandle k, TRAPS);
-  static instanceKlassHandle load_shared_class(Symbol* class_name,
-                                               Handle class_loader, TRAPS);
   static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
-                                               Handle class_loader, TRAPS);
+                                               Handle class_loader,
+                                               Handle protection_domain,
+                                               TRAPS);
   static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
   static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
   static void check_loader_lock_contention(Handle loader_lock, TRAPS);
@@ -625,9 +639,12 @@
   static bool is_parallelDefine(Handle class_loader);
 
 public:
+  static instanceKlassHandle load_shared_class(Symbol* class_name,
+                                               Handle class_loader,
+                                               TRAPS);
   static bool is_ext_class_loader(Handle class_loader);
 
-private:
+protected:
   static Klass* find_shared_class(Symbol* class_name);
 
   // Setup link to hierarchy
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/classfile/systemDictionaryShared.hpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/classfile/systemDictionaryShared.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+
+#ifndef SHARE_VM_CLASSFILE_SYSTEMDICTIONARYSHARED_HPP
+#define SHARE_VM_CLASSFILE_SYSTEMDICTIONARYSHARED_HPP
+
+#include "classfile/systemDictionary.hpp"
+
+class SystemDictionaryShared: public SystemDictionary {
+public:
+  static void initialize(TRAPS) {}
+  static instanceKlassHandle find_or_load_shared_class(Symbol* class_name,
+                                                       Handle class_loader,
+                                                       TRAPS) {
+    return instanceKlassHandle();
+  }
+  static void roots_oops_do(OopClosure* blk) {}
+  static void oops_do(OopClosure* f) {}
+  static bool is_sharing_possible(ClassLoaderData* loader_data) {
+    oop class_loader = loader_data->class_loader();
+    return (class_loader == NULL);
+  }
+};
+
+#endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARYSHARED_HPP
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/classfile/vmSymbols.hpp
--- a/src/share/vm/classfile/vmSymbols.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/classfile/vmSymbols.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -91,11 +91,17 @@
   template(java_lang_CharSequence,                    "java/lang/CharSequence")                   \
   template(java_lang_SecurityManager,                 "java/lang/SecurityManager")                \
   template(java_security_AccessControlContext,        "java/security/AccessControlContext")       \
+  template(java_security_CodeSource,                  "java/security/CodeSource")                 \
   template(java_security_ProtectionDomain,            "java/security/ProtectionDomain")           \
+  template(java_security_SecureClassLoader,           "java/security/SecureClassLoader")          \
+  template(java_net_URLClassLoader,                   "java/net/URLClassLoader")                  \
+  template(java_net_URL,                              "java/net/URL")                             \
+  template(java_util_jar_Manifest,                    "java/util/jar/Manifest")                   \
   template(impliesCreateAccessControlContext_name,    "impliesCreateAccessControlContext")        \
   template(java_io_OutputStream,                      "java/io/OutputStream")                     \
   template(java_io_Reader,                            "java/io/Reader")                           \
   template(java_io_BufferedReader,                    "java/io/BufferedReader")                   \
+  template(java_io_File,                              "java/io/File")                             \
   template(java_io_FileInputStream,                   "java/io/FileInputStream")                  \
   template(java_io_ByteArrayInputStream,              "java/io/ByteArrayInputStream")             \
   template(java_io_Serializable,                      "java/io/Serializable")                     \
@@ -106,6 +112,7 @@
   template(java_util_Hashtable,                       "java/util/Hashtable")                      \
   template(java_lang_Compiler,                        "java/lang/Compiler")                       \
   template(sun_misc_Signal,                           "sun/misc/Signal")                          \
+  template(sun_misc_Launcher,                         "sun/misc/Launcher")                        \
   template(java_lang_AssertionStatusDirectives,       "java/lang/AssertionStatusDirectives")      \
   template(getBootClassPathEntryForClass_name,        "getBootClassPathEntryForClass")            \
   template(sun_misc_PostVMInitHook,                   "sun/misc/PostVMInitHook")                  \
@@ -397,6 +404,14 @@
   template(signers_name,                              "signers_name")                             \
   template(loader_data_name,                          "loader_data")                              \
   template(dependencies_name,                         "dependencies")                             \
+  template(input_stream_void_signature,               "(Ljava/io/InputStream;)V")                 \
+  template(getFileURL_name,                           "getFileURL")                               \
+  template(getFileURL_signature,                      "(Ljava/io/File;)Ljava/net/URL;")           \
+  template(definePackageInternal_name,                "definePackageInternal")                    \
+  template(definePackageInternal_signature,           "(Ljava/lang/String;Ljava/util/jar/Manifest;Ljava/net/URL;)V") \
+  template(getProtectionDomain_name,                  "getProtectionDomain")                      \
+  template(getProtectionDomain_signature,             "(Ljava/security/CodeSource;)Ljava/security/ProtectionDomain;") \
+  template(url_code_signer_array_void_signature,      "(Ljava/net/URL;[Ljava/security/CodeSigner;)V") \
                                                                                                   \
   /* non-intrinsic name/signature pairs: */                                                       \
   template(register_method_name,                      "register")                                 \
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/concurrentMark.cpp
--- a/src/share/vm/gc_implementation/g1/concurrentMark.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/concurrentMark.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -34,8 +34,8 @@
 #include "gc_implementation/g1/g1OopClosures.inline.hpp"
 #include "gc_implementation/g1/g1RemSet.hpp"
 #include "gc_implementation/g1/heapRegion.inline.hpp"
+#include "gc_implementation/g1/heapRegionManager.inline.hpp"
 #include "gc_implementation/g1/heapRegionRemSet.hpp"
-#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
 #include "gc_implementation/g1/heapRegionSet.inline.hpp"
 #include "gc_implementation/shared/vmGCOperations.hpp"
 #include "gc_implementation/shared/gcTimer.hpp"
@@ -433,10 +433,6 @@
   }
 }
 
-bool ConcurrentMark::not_yet_marked(oop obj) const {
-  return _g1h->is_obj_ill(obj);
-}
-
 CMRootRegions::CMRootRegions() :
   _young_list(NULL), _cm(NULL), _scan_in_progress(false),
   _should_abort(false),  _next_survivor(NULL) { }
@@ -891,7 +887,16 @@
   }
 
   virtual bool doHeapRegion(HeapRegion* r) {
-    return _bitmap->getNextMarkedWordAddress(r->bottom(), r->end()) != r->end();
+    // This closure can be called concurrently to the mutator, so we must make sure
+    // that the result of the getNextMarkedWordAddress() call is compared to the
+    // value passed to it as limit to detect any found bits.
+    // We can use the region's orig_end() for the limit and the comparison value
+    // as it always contains the "real" end of the region that never changes and
+    // has no side effects.
+    // Due to the latter, there can also be no problem with the compiler generating
+    // reloads of the orig_end() call.
+    HeapWord* end = r->orig_end();
+    return _bitmap->getNextMarkedWordAddress(r->bottom(), end) != end;
   }
 };
 
@@ -1116,20 +1121,17 @@
     if (!_cm->has_aborted()) {
       do {
         double start_vtime_sec = os::elapsedVTime();
-        double start_time_sec = os::elapsedTime();
         double mark_step_duration_ms = G1ConcMarkStepDurationMillis;
 
         the_task->do_marking_step(mark_step_duration_ms,
                                   true  /* do_termination */,
                                   false /* is_serial*/);
 
-        double end_time_sec = os::elapsedTime();
         double end_vtime_sec = os::elapsedVTime();
         double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec;
-        double elapsed_time_sec = end_time_sec - start_time_sec;
         _cm->clear_has_overflown();
 
-        bool ret = _cm->do_yield_check(worker_id);
+        _cm->do_yield_check(worker_id);
 
         jlong sleep_time_ms;
         if (!_cm->has_aborted() && the_task->has_aborted()) {
@@ -1139,17 +1141,6 @@
           os::sleep(Thread::current(), sleep_time_ms, false);
           SuspendibleThreadSet::join();
         }
-        double end_time2_sec = os::elapsedTime();
-        double elapsed_time2_sec = end_time2_sec - start_time_sec;
-
-#if 0
-          gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, "
-                                 "overhead %1.4lf",
-                                 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms,
-                                 the_task->conc_overhead(os::elapsedTime()) * 8.0);
-          gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms",
-                                 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0);
-#endif
       } while (!_cm->has_aborted() && the_task->has_aborted());
     }
     the_task->record_end_time();
@@ -1408,7 +1399,7 @@
   void set_bit_for_region(HeapRegion* hr) {
     assert(!hr->continuesHumongous(), "should have filtered those out");
 
-    BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index();
+    BitMap::idx_t index = (BitMap::idx_t) hr->hrm_index();
     if (!hr->startsHumongous()) {
       // Normal (non-humongous) case: just set the bit.
       _region_bm->par_at_put(index, true);
@@ -1596,7 +1587,7 @@
       if (_verbose) {
         gclog_or_tty->print_cr("Region %u: marked bytes mismatch: "
                                "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT,
-                               hr->hrs_index(), exp_marked_bytes, act_marked_bytes);
+                               hr->hrm_index(), exp_marked_bytes, act_marked_bytes);
       }
       failures += 1;
     }
@@ -1605,7 +1596,7 @@
     // (which was just calculated) region bit maps.
     // We're not OK if the bit in the calculated expected region
     // bitmap is set and the bit in the actual region bitmap is not.
-    BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index();
+    BitMap::idx_t index = (BitMap::idx_t) hr->hrm_index();
 
     bool expected = _exp_region_bm->at(index);
     bool actual = _region_bm->at(index);
@@ -1613,7 +1604,7 @@
       if (_verbose) {
         gclog_or_tty->print_cr("Region %u: region bitmap mismatch: "
                                "expected: %s, actual: %s",
-                               hr->hrs_index(),
+                               hr->hrm_index(),
                                BOOL_TO_STR(expected), BOOL_TO_STR(actual));
       }
       failures += 1;
@@ -1634,7 +1625,7 @@
         if (_verbose) {
           gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": "
                                  "expected: %s, actual: %s",
-                                 hr->hrs_index(), i,
+                                 hr->hrm_index(), i,
                                  BOOL_TO_STR(expected), BOOL_TO_STR(actual));
         }
         failures += 1;
@@ -2947,11 +2938,6 @@
   _nextMarkBitMap->clearRange(mr);
 }
 
-void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) {
-  clearRangePrevBitmap(mr);
-  clearRangeNextBitmap(mr);
-}
-
 HeapRegion*
 ConcurrentMark::claim_region(uint worker_id) {
   // "checkpoint" the finger
@@ -3254,7 +3240,7 @@
     assert(limit_idx <= end_idx, "or else use atomics");
 
     // Aggregate the "stripe" in the count data associated with hr.
-    uint hrs_index = hr->hrs_index();
+    uint hrm_index = hr->hrm_index();
     size_t marked_bytes = 0;
 
     for (uint i = 0; i < _max_worker_id; i += 1) {
@@ -3263,7 +3249,7 @@
 
       // Fetch the marked_bytes in this region for task i and
       // add it to the running total for this region.
-      marked_bytes += marked_bytes_array[hrs_index];
+      marked_bytes += marked_bytes_array[hrm_index];
 
       // Now union the bitmaps[0,max_worker_id)[start_idx..limit_idx)
       // into the global card bitmap.
@@ -3497,17 +3483,6 @@
   }
 }
 
-bool ConcurrentMark::containing_card_is_marked(void* p) {
-  size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1);
-  return _card_bm.at(offset >> CardTableModRefBS::card_shift);
-}
-
-bool ConcurrentMark::containing_cards_are_marked(void* start,
-                                                 void* last) {
-  return containing_card_is_marked(start) &&
-         containing_card_is_marked(last);
-}
-
 #ifndef PRODUCT
 // for debugging purposes
 void ConcurrentMark::print_finger() {
@@ -3760,7 +3735,7 @@
 
   if (_cm->verbose_medium()) {
       gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, "
-                        "scanned = %d%s, refs reached = %d%s",
+                        "scanned = "SIZE_FORMAT"%s, refs reached = "SIZE_FORMAT"%s",
                         _worker_id, last_interval_ms,
                         _words_scanned,
                         (_words_scanned >= _words_scanned_limit) ? " (*)" : "",
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/concurrentMark.hpp
--- a/src/share/vm/gc_implementation/g1/concurrentMark.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/concurrentMark.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -683,7 +683,9 @@
     return _task_queues->steal(worker_id, hash_seed, obj);
   }
 
-  ConcurrentMark(G1CollectedHeap* g1h, G1RegionToSpaceMapper* prev_bitmap_storage, G1RegionToSpaceMapper* next_bitmap_storage);
+  ConcurrentMark(G1CollectedHeap* g1h,
+                 G1RegionToSpaceMapper* prev_bitmap_storage,
+                 G1RegionToSpaceMapper* next_bitmap_storage);
   ~ConcurrentMark();
 
   ConcurrentMarkThread* cmThread() { return _cmThread; }
@@ -712,8 +714,10 @@
   // inconsistent) and always passing the size. hr is the region that
   // contains the object and it's passed optionally from callers who
   // might already have it (no point in recalculating it).
-  inline void grayRoot(oop obj, size_t word_size,
-                       uint worker_id, HeapRegion* hr = NULL);
+  inline void grayRoot(oop obj,
+                       size_t word_size,
+                       uint worker_id,
+                       HeapRegion* hr = NULL);
 
   // It iterates over the heap and for each object it comes across it
   // will dump the contents of its reference fields, as well as
@@ -734,7 +738,8 @@
   //   AND MARKED : indicates that an object is both explicitly and
   //   implicitly live (it should be one or the other, not both)
   void print_reachable(const char* str,
-                       VerifyOption vo, bool all) PRODUCT_RETURN;
+                       VerifyOption vo,
+                       bool all) PRODUCT_RETURN;
 
   // Clear the next marking bitmap (will be called concurrently).
   void clearNextBitmap();
@@ -771,12 +776,11 @@
   // this carefully!
   inline void markPrev(oop p);
 
-  // Clears marks for all objects in the given range, for the prev,
-  // next, or both bitmaps.  NB: the previous bitmap is usually
+  // Clears marks for all objects in the given range, for the prev or
+  // next bitmaps.  NB: the previous bitmap is usually
   // read-only, so use this carefully!
   void clearRangePrevBitmap(MemRegion mr);
   void clearRangeNextBitmap(MemRegion mr);
-  void clearRangeBothBitmaps(MemRegion mr);
 
   // Notify data structures that a GC has started.
   void note_start_of_gc() {
@@ -798,21 +802,6 @@
                            bool verify_thread_buffers,
                            bool verify_fingers) PRODUCT_RETURN;
 
-  bool isMarked(oop p) const {
-    assert(p != NULL && p->is_oop(), "expected an oop");
-    HeapWord* addr = (HeapWord*)p;
-    assert(addr >= _nextMarkBitMap->startWord() ||
-           addr < _nextMarkBitMap->endWord(), "in a region");
-
-    return _nextMarkBitMap->isMarked(addr);
-  }
-
-  inline bool not_yet_marked(oop p) const;
-
-  // XXX Debug code
-  bool containing_card_is_marked(void* p);
-  bool containing_cards_are_marked(void* start, void* last);
-
   bool isPrevMarked(oop p) const {
     assert(p != NULL && p->is_oop(), "expected an oop");
     HeapWord* addr = (HeapWord*)p;
@@ -898,7 +887,8 @@
   // marked_bytes array slot for the given HeapRegion.
   // Sets the bits in the given card bitmap that are associated with the
   // cards that are spanned by the memory region.
-  inline void count_region(MemRegion mr, HeapRegion* hr,
+  inline void count_region(MemRegion mr,
+                           HeapRegion* hr,
                            size_t* marked_bytes_array,
                            BitMap* task_card_bm);
 
@@ -906,56 +896,27 @@
   // data structures for the given worker id.
   inline void count_region(MemRegion mr, HeapRegion* hr, uint worker_id);
 
-  // Counts the given memory region in the task/worker counting
-  // data structures for the given worker id.
-  inline void count_region(MemRegion mr, uint worker_id);
-
   // Counts the given object in the given task/worker counting
   // data structures.
-  inline void count_object(oop obj, HeapRegion* hr,
+  inline void count_object(oop obj,
+                           HeapRegion* hr,
                            size_t* marked_bytes_array,
                            BitMap* task_card_bm);
 
-  // Counts the given object in the task/worker counting data
-  // structures for the given worker id.
-  inline void count_object(oop obj, HeapRegion* hr, uint worker_id);
-
   // Attempts to mark the given object and, if successful, counts
   // the object in the given task/worker counting structures.
-  inline bool par_mark_and_count(oop obj, HeapRegion* hr,
+  inline bool par_mark_and_count(oop obj,
+                                 HeapRegion* hr,
                                  size_t* marked_bytes_array,
                                  BitMap* task_card_bm);
 
   // Attempts to mark the given object and, if successful, counts
   // the object in the task/worker counting structures for the
   // given worker id.
-  inline bool par_mark_and_count(oop obj, size_t word_size,
-                                 HeapRegion* hr, uint worker_id);
-
-  // Attempts to mark the given object and, if successful, counts
-  // the object in the task/worker counting structures for the
-  // given worker id.
-  inline bool par_mark_and_count(oop obj, HeapRegion* hr, uint worker_id);
-
-  // Similar to the above routine but we don't know the heap region that
-  // contains the object to be marked/counted, which this routine looks up.
-  inline bool par_mark_and_count(oop obj, uint worker_id);
-
-  // Similar to the above routine but there are times when we cannot
-  // safely calculate the size of obj due to races and we, therefore,
-  // pass the size in as a parameter. It is the caller's reponsibility
-  // to ensure that the size passed in for obj is valid.
-  inline bool par_mark_and_count(oop obj, size_t word_size, uint worker_id);
-
-  // Unconditionally mark the given object, and unconditinally count
-  // the object in the counting structures for worker id 0.
-  // Should *not* be called from parallel code.
-  inline bool mark_and_count(oop obj, HeapRegion* hr);
-
-  // Similar to the above routine but we don't know the heap region that
-  // contains the object to be marked/counted, which this routine looks up.
-  // Should *not* be called from parallel code.
-  inline bool mark_and_count(oop obj);
+  inline bool par_mark_and_count(oop obj,
+                                 size_t word_size,
+                                 HeapRegion* hr,
+                                 uint worker_id);
 
   // Returns true if initialization was successfully completed.
   bool completed_initialization() const {
@@ -1227,9 +1188,12 @@
     _finger = new_finger;
   }
 
-  CMTask(uint worker_id, ConcurrentMark *cm,
-         size_t* marked_bytes, BitMap* card_bm,
-         CMTaskQueue* task_queue, CMTaskQueueSet* task_queues);
+  CMTask(uint worker_id,
+         ConcurrentMark *cm,
+         size_t* marked_bytes,
+         BitMap* card_bm,
+         CMTaskQueue* task_queue,
+         CMTaskQueueSet* task_queues);
 
   // it prints statistics associated with this task
   void print_stats();
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/concurrentMark.inline.hpp
--- a/src/share/vm/gc_implementation/g1/concurrentMark.inline.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/concurrentMark.inline.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -86,7 +86,7 @@
   HeapWord* start = mr.start();
   HeapWord* end = mr.end();
   size_t region_size_bytes = mr.byte_size();
-  uint index = hr->hrs_index();
+  uint index = hr->hrm_index();
 
   assert(!hr->continuesHumongous(), "should not be HC region");
   assert(hr == g1h->heap_region_containing(start), "sanity");
@@ -125,14 +125,6 @@
   count_region(mr, hr, marked_bytes_array, task_card_bm);
 }
 
-// Counts the given memory region, which may be a single object, in the
-// task/worker counting data structures for the given worker id.
-inline void ConcurrentMark::count_region(MemRegion mr, uint worker_id) {
-  HeapWord* addr = mr.start();
-  HeapRegion* hr = _g1h->heap_region_containing_raw(addr);
-  count_region(mr, hr, worker_id);
-}
-
 // Counts the given object in the given task/worker counting data structures.
 inline void ConcurrentMark::count_object(oop obj,
                                          HeapRegion* hr,
@@ -142,17 +134,6 @@
   count_region(mr, hr, marked_bytes_array, task_card_bm);
 }
 
-// Counts the given object in the task/worker counting data
-// structures for the given worker id.
-inline void ConcurrentMark::count_object(oop obj,
-                                         HeapRegion* hr,
-                                         uint worker_id) {
-  size_t* marked_bytes_array = count_marked_bytes_array_for(worker_id);
-  BitMap* task_card_bm = count_card_bitmap_for(worker_id);
-  HeapWord* addr = (HeapWord*) obj;
-  count_object(obj, hr, marked_bytes_array, task_card_bm);
-}
-
 // Attempts to mark the given object and, if successful, counts
 // the object in the given task/worker counting structures.
 inline bool ConcurrentMark::par_mark_and_count(oop obj,
@@ -184,63 +165,6 @@
   return false;
 }
 
-// Attempts to mark the given object and, if successful, counts
-// the object in the task/worker counting structures for the
-// given worker id.
-inline bool ConcurrentMark::par_mark_and_count(oop obj,
-                                               HeapRegion* hr,
-                                               uint worker_id) {
-  HeapWord* addr = (HeapWord*)obj;
-  if (_nextMarkBitMap->parMark(addr)) {
-    // Update the task specific count data for the object.
-    count_object(obj, hr, worker_id);
-    return true;
-  }
-  return false;
-}
-
-// As above - but we don't know the heap region containing the
-// object and so have to supply it.
-inline bool ConcurrentMark::par_mark_and_count(oop obj, uint worker_id) {
-  HeapWord* addr = (HeapWord*)obj;
-  HeapRegion* hr = _g1h->heap_region_containing_raw(addr);
-  return par_mark_and_count(obj, hr, worker_id);
-}
-
-// Similar to the above routine but we already know the size, in words, of
-// the object that we wish to mark/count
-inline bool ConcurrentMark::par_mark_and_count(oop obj,
-                                               size_t word_size,
-                                               uint worker_id) {
-  HeapWord* addr = (HeapWord*)obj;
-  if (_nextMarkBitMap->parMark(addr)) {
-    // Update the task specific count data for the object.
-    MemRegion mr(addr, word_size);
-    count_region(mr, worker_id);
-    return true;
-  }
-  return false;
-}
-
-// Unconditionally mark the given object, and unconditinally count
-// the object in the counting structures for worker id 0.
-// Should *not* be called from parallel code.
-inline bool ConcurrentMark::mark_and_count(oop obj, HeapRegion* hr) {
-  HeapWord* addr = (HeapWord*)obj;
-  _nextMarkBitMap->mark(addr);
-  // Update the task specific count data for the object.
-  count_object(obj, hr, 0 /* worker_id */);
-  return true;
-}
-
-// As above - but we don't have the heap region containing the
-// object, so we have to supply it.
-inline bool ConcurrentMark::mark_and_count(oop obj) {
-  HeapWord* addr = (HeapWord*)obj;
-  HeapRegion* hr = _g1h->heap_region_containing_raw(addr);
-  return mark_and_count(obj, hr);
-}
-
 inline bool CMBitMapRO::iterate(BitMapClosure* cl, MemRegion mr) {
   HeapWord* start_addr = MAX2(startWord(), mr.start());
   HeapWord* end_addr = MIN2(endWord(), mr.end());
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
--- a/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -528,9 +528,9 @@
       // again to allocate from it.
       append_secondary_free_list();
 
-      assert(_hrs.num_free_regions() > 0, "if the secondary_free_list was not "
+      assert(_hrm.num_free_regions() > 0, "if the secondary_free_list was not "
              "empty we should have moved at least one entry to the free_list");
-      HeapRegion* res = _hrs.allocate_free_region(is_old);
+      HeapRegion* res = _hrm.allocate_free_region(is_old);
       if (G1ConcRegionFreeingVerbose) {
         gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : "
                                "allocated "HR_FORMAT" from secondary_free_list",
@@ -571,7 +571,7 @@
     }
   }
 
-  res = _hrs.allocate_free_region(is_old);
+  res = _hrm.allocate_free_region(is_old);
 
   if (res == NULL) {
     if (G1ConcRegionFreeingVerbose) {
@@ -597,7 +597,7 @@
       // always expand the heap by an amount aligned to the heap
       // region size, the free list should in theory not be empty.
       // In either case allocate_free_region() will check for NULL.
-      res = _hrs.allocate_free_region(is_old);
+      res = _hrm.allocate_free_region(is_old);
     } else {
       _expand_heap_after_alloc_failure = false;
     }
@@ -609,7 +609,7 @@
 G1CollectedHeap::humongous_obj_allocate_initialize_regions(uint first,
                                                            uint num_regions,
                                                            size_t word_size) {
-  assert(first != G1_NO_HRS_INDEX, "pre-condition");
+  assert(first != G1_NO_HRM_INDEX, "pre-condition");
   assert(isHumongous(word_size), "word_size should be humongous");
   assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition");
 
@@ -747,7 +747,7 @@
 
   verify_region_sets_optional();
 
-  uint first = G1_NO_HRS_INDEX;
+  uint first = G1_NO_HRM_INDEX;
   uint obj_regions = (uint)(align_size_up_(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords);
 
   if (obj_regions == 1) {
@@ -756,7 +756,7 @@
     // later.
     HeapRegion* hr = new_region(word_size, true /* is_old */, false /* do_expand */);
     if (hr != NULL) {
-      first = hr->hrs_index();
+      first = hr->hrm_index();
     }
   } else {
     // We can't allocate humongous regions spanning more than one region while
@@ -772,18 +772,18 @@
 
     // Policy: Try only empty regions (i.e. already committed first). Maybe we
     // are lucky enough to find some.
-    first = _hrs.find_contiguous_only_empty(obj_regions);
-    if (first != G1_NO_HRS_INDEX) {
-      _hrs.allocate_free_regions_starting_at(first, obj_regions);
-    }
-  }
-
-  if (first == G1_NO_HRS_INDEX) {
+    first = _hrm.find_contiguous_only_empty(obj_regions);
+    if (first != G1_NO_HRM_INDEX) {
+      _hrm.allocate_free_regions_starting_at(first, obj_regions);
+    }
+  }
+
+  if (first == G1_NO_HRM_INDEX) {
     // Policy: We could not find enough regions for the humongous object in the
     // free list. Look through the heap to find a mix of free and uncommitted regions.
     // If so, try expansion.
-    first = _hrs.find_contiguous_empty_or_unavailable(obj_regions);
-    if (first != G1_NO_HRS_INDEX) {
+    first = _hrm.find_contiguous_empty_or_unavailable(obj_regions);
+    if (first != G1_NO_HRM_INDEX) {
       // We found something. Make sure these regions are committed, i.e. expand
       // the heap. Alternatively we could do a defragmentation GC.
       ergo_verbose1(ErgoHeapSizing,
@@ -792,7 +792,7 @@
                     ergo_format_byte("allocation request"),
                     word_size * HeapWordSize);
 
-      _hrs.expand_at(first, obj_regions);
+      _hrm.expand_at(first, obj_regions);
       g1_policy()->record_new_heap_size(num_regions());
 
 #ifdef ASSERT
@@ -802,14 +802,14 @@
         assert(is_on_master_free_list(hr), "sanity");
       }
 #endif
-      _hrs.allocate_free_regions_starting_at(first, obj_regions);
+      _hrm.allocate_free_regions_starting_at(first, obj_regions);
     } else {
       // Policy: Potentially trigger a defragmentation GC.
     }
   }
 
   HeapWord* result = NULL;
-  if (first != G1_NO_HRS_INDEX) {
+  if (first != G1_NO_HRM_INDEX) {
     result = humongous_obj_allocate_initialize_regions(first, obj_regions, word_size);
     assert(result != NULL, "it should always return a valid result");
 
@@ -1244,7 +1244,7 @@
     : _hr_printer(hr_printer) { }
 };
 
-void G1CollectedHeap::print_hrs_post_compaction() {
+void G1CollectedHeap::print_hrm_post_compaction() {
   PostCompactionPrinterClosure cl(hr_printer());
   heap_region_iterate(&cl);
 }
@@ -1413,7 +1413,7 @@
         // that all the COMMIT / UNCOMMIT events are generated before
         // the end GC event.
 
-        print_hrs_post_compaction();
+        print_hrm_post_compaction();
         _hr_printer.end_gc(true /* full */, (size_t) total_collections());
       }
 
@@ -1486,7 +1486,7 @@
       // Update the number of full collections that have been completed.
       increment_old_marking_cycles_completed(false /* concurrent */);
 
-      _hrs.verify_optional();
+      _hrm.verify_optional();
       verify_region_sets_optional();
 
       verify_after_gc();
@@ -1730,7 +1730,7 @@
                 ergo_format_byte("allocation request"),
                 word_size * HeapWordSize);
   if (expand(expand_bytes)) {
-    _hrs.verify_optional();
+    _hrm.verify_optional();
     verify_region_sets_optional();
     return attempt_allocation_at_safepoint(word_size,
                                  false /* expect_null_mutator_alloc_region */);
@@ -1758,7 +1758,7 @@
   uint regions_to_expand = (uint)(aligned_expand_bytes / HeapRegion::GrainBytes);
   assert(regions_to_expand > 0, "Must expand by at least one region");
 
-  uint expanded_by = _hrs.expand_by(regions_to_expand);
+  uint expanded_by = _hrm.expand_by(regions_to_expand);
 
   if (expanded_by > 0) {
     size_t actual_expand_bytes = expanded_by * HeapRegion::GrainBytes;
@@ -1771,7 +1771,7 @@
     // The expansion of the virtual storage space was unsuccessful.
     // Let's see if it was because we ran out of swap.
     if (G1ExitOnExpansionFailure &&
-        _hrs.available() >= regions_to_expand) {
+        _hrm.available() >= regions_to_expand) {
       // We had head room...
       vm_exit_out_of_memory(aligned_expand_bytes, OOM_MMAP_ERROR, "G1 heap expansion");
     }
@@ -1786,7 +1786,7 @@
                                          HeapRegion::GrainBytes);
   uint num_regions_to_remove = (uint)(shrink_bytes / HeapRegion::GrainBytes);
 
-  uint num_regions_removed = _hrs.shrink_by(num_regions_to_remove);
+  uint num_regions_removed = _hrm.shrink_by(num_regions_to_remove);
   size_t shrunk_bytes = num_regions_removed * HeapRegion::GrainBytes;
 
   ergo_verbose3(ErgoHeapSizing,
@@ -1819,7 +1819,7 @@
   shrink_helper(shrink_bytes);
   rebuild_region_sets(true /* free_list_only */);
 
-  _hrs.verify_optional();
+  _hrm.verify_optional();
   verify_region_sets_optional();
 }
 
@@ -2028,7 +2028,7 @@
                                          CMBitMap::mark_distance(),
                                          mtGC);
 
-  _hrs.initialize(heap_storage, prev_bitmap_storage, next_bitmap_storage, bot_storage, cardtable_storage, card_counts_storage);
+  _hrm.initialize(heap_storage, prev_bitmap_storage, next_bitmap_storage, bot_storage, cardtable_storage, card_counts_storage);
   g1_barrier_set()->initialize(cardtable_storage);
    // Do later initialization work for concurrent refinement.
   _cg1r->init(card_counts_storage);
@@ -2049,8 +2049,8 @@
 
   _g1h = this;
 
-  _in_cset_fast_test.initialize(_hrs.reserved().start(), _hrs.reserved().end(), HeapRegion::GrainBytes);
-  _humongous_is_live.initialize(_hrs.reserved().start(), _hrs.reserved().end(), HeapRegion::GrainBytes);
+  _in_cset_fast_test.initialize(_hrm.reserved().start(), _hrm.reserved().end(), HeapRegion::GrainBytes);
+  _humongous_is_live.initialize(_hrm.reserved().start(), _hrm.reserved().end(), HeapRegion::GrainBytes);
 
   // Create the ConcurrentMark data structure and thread.
   // (Must do this late, so that "max_regions" is defined.)
@@ -2111,7 +2111,7 @@
 
   // Here we allocate the dummy HeapRegion that is required by the
   // G1AllocRegion class.
-  HeapRegion* dummy_region = _hrs.get_dummy_region();
+  HeapRegion* dummy_region = _hrm.get_dummy_region();
 
   // We'll re-use the same region whether the alloc region will
   // require BOT updates or not and, if it doesn't, then a non-young
@@ -2228,14 +2228,14 @@
 }
 
 size_t G1CollectedHeap::capacity() const {
-  return _hrs.length() * HeapRegion::GrainBytes;
+  return _hrm.length() * HeapRegion::GrainBytes;
 }
 
 void G1CollectedHeap::reset_gc_time_stamps(HeapRegion* hr) {
   assert(!hr->continuesHumongous(), "pre-condition");
   hr->reset_gc_time_stamp();
   if (hr->startsHumongous()) {
-    uint first_index = hr->hrs_index() + 1;
+    uint first_index = hr->hrm_index() + 1;
     uint last_index = hr->last_hc_index();
     for (uint i = first_index; i < last_index; i += 1) {
       HeapRegion* chr = region_at(i);
@@ -2533,7 +2533,7 @@
 }
 
 bool G1CollectedHeap::is_in(const void* p) const {
-  if (_hrs.reserved().contains(p)) {
+  if (_hrm.reserved().contains(p)) {
     // Given that we know that p is in the reserved space,
     // heap_region_containing_raw() should successfully
     // return the containing region.
@@ -2547,7 +2547,7 @@
 #ifdef ASSERT
 bool G1CollectedHeap::is_in_exact(const void* p) const {
   bool contains = reserved_region().contains(p);
-  bool available = _hrs.is_available(addr_to_region((HeapWord*)p));
+  bool available = _hrm.is_available(addr_to_region((HeapWord*)p));
   if (contains && available) {
     return true;
   } else {
@@ -2614,7 +2614,7 @@
 }
 
 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const {
-  _hrs.iterate(cl);
+  _hrm.iterate(cl);
 }
 
 void
@@ -2622,7 +2622,7 @@
                                                  uint worker_id,
                                                  uint num_workers,
                                                  jint claim_value) const {
-  _hrs.par_iterate(cl, worker_id, num_workers, claim_value);
+  _hrm.par_iterate(cl, worker_id, num_workers, claim_value);
 }
 
 class ResetClaimValuesClosure: public HeapRegionClosure {
@@ -2842,9 +2842,9 @@
 }
 
 HeapRegion* G1CollectedHeap::next_compaction_region(const HeapRegion* from) const {
-  HeapRegion* result = _hrs.next_region_in_heap(from);
+  HeapRegion* result = _hrm.next_region_in_heap(from);
   while (result != NULL && result->isHumongous()) {
-    result = _hrs.next_region_in_heap(result);
+    result = _hrm.next_region_in_heap(result);
   }
   return result;
 }
@@ -2904,7 +2904,7 @@
 }
 
 size_t G1CollectedHeap::max_capacity() const {
-  return _hrs.reserved().byte_size();
+  return _hrm.reserved().byte_size();
 }
 
 jlong G1CollectedHeap::millis_since_last_gc() {
@@ -3433,9 +3433,9 @@
   st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K",
             capacity()/K, used_unlocked()/K);
   st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")",
-            _hrs.reserved().start(),
-            _hrs.reserved().start() + _hrs.length() + HeapRegion::GrainWords,
-            _hrs.reserved().end());
+            _hrm.reserved().start(),
+            _hrm.reserved().start() + _hrm.length() + HeapRegion::GrainWords,
+            _hrm.reserved().end());
   st->cr();
   st->print("  region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K);
   uint young_regions = _young_list->length();
@@ -3678,7 +3678,7 @@
     }
     G1CollectedHeap* g1h = G1CollectedHeap::heap();
 
-    uint region_idx = r->hrs_index();
+    uint region_idx = r->hrm_index();
     bool is_candidate = !g1h->humongous_region_is_always_live(region_idx);
     // Is_candidate already filters out humongous regions with some remembered set.
     // This will not lead to humongous object that we mistakenly keep alive because
@@ -4200,7 +4200,7 @@
     // output from the concurrent mark thread interfering with this
     // logging output either.
 
-    _hrs.verify_optional();
+    _hrm.verify_optional();
     verify_region_sets_optional();
 
     TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats());
@@ -6019,7 +6019,7 @@
                                   bool locked) {
   assert(!hr->isHumongous(), "this is only for non-humongous regions");
   assert(!hr->is_empty(), "the region should not be empty");
-  assert(_hrs.is_available(hr->hrs_index()), "region should be committed");
+  assert(_hrm.is_available(hr->hrm_index()), "region should be committed");
   assert(free_list != NULL, "pre-condition");
 
   if (G1VerifyBitmaps) {
@@ -6050,7 +6050,7 @@
   hr->set_notHumongous();
   free_region(hr, free_list, par);
 
-  uint i = hr->hrs_index() + 1;
+  uint i = hr->hrm_index() + 1;
   while (i < last_index) {
     HeapRegion* curr_hr = region_at(i);
     assert(curr_hr->continuesHumongous(), "invariant");
@@ -6074,7 +6074,7 @@
   assert(list != NULL, "list can't be null");
   if (!list->is_empty()) {
     MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
-    _hrs.insert_list_into_free_list(list);
+    _hrm.insert_list_into_free_list(list);
   }
 }
 
@@ -6443,7 +6443,7 @@
     // While this cleanup is not strictly necessary to be done (or done instantly),
     // given that their occurrence is very low, this saves us this additional
     // complexity.
-    uint region_idx = r->hrs_index();
+    uint region_idx = r->hrm_index();
     if (g1h->humongous_is_live(region_idx) ||
         g1h->humongous_region_is_always_live(region_idx)) {
 
@@ -6682,22 +6682,22 @@
     // this is that during a full GC string deduplication needs to know if
     // a collected region was young or old when the full GC was initiated.
   }
-  _hrs.remove_all_free_regions();
+  _hrm.remove_all_free_regions();
 }
 
 class RebuildRegionSetsClosure : public HeapRegionClosure {
 private:
   bool            _free_list_only;
   HeapRegionSet*   _old_set;
-  HeapRegionSeq*   _hrs;
+  HeapRegionManager*   _hrm;
   size_t          _total_used;
 
 public:
   RebuildRegionSetsClosure(bool free_list_only,
-                           HeapRegionSet* old_set, HeapRegionSeq* hrs) :
+                           HeapRegionSet* old_set, HeapRegionManager* hrm) :
     _free_list_only(free_list_only),
-    _old_set(old_set), _hrs(hrs), _total_used(0) {
-    assert(_hrs->num_free_regions() == 0, "pre-condition");
+    _old_set(old_set), _hrm(hrm), _total_used(0) {
+    assert(_hrm->num_free_regions() == 0, "pre-condition");
     if (!free_list_only) {
       assert(_old_set->is_empty(), "pre-condition");
     }
@@ -6710,7 +6710,7 @@
 
     if (r->is_empty()) {
       // Add free regions to the free list
-      _hrs->insert_into_free_list(r);
+      _hrm->insert_into_free_list(r);
     } else if (!_free_list_only) {
       assert(!r->is_young(), "we should not come across young regions");
 
@@ -6738,7 +6738,7 @@
     _young_list->empty_list();
   }
 
-  RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_hrs);
+  RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_hrm);
   heap_region_iterate(&cl);
 
   if (!free_list_only) {
@@ -6928,7 +6928,7 @@
 private:
   HeapRegionSet*   _old_set;
   HeapRegionSet*   _humongous_set;
-  HeapRegionSeq*   _hrs;
+  HeapRegionManager*   _hrm;
 
 public:
   HeapRegionSetCount _old_count;
@@ -6937,8 +6937,8 @@
 
   VerifyRegionListsClosure(HeapRegionSet* old_set,
                            HeapRegionSet* humongous_set,
-                           HeapRegionSeq* hrs) :
-    _old_set(old_set), _humongous_set(humongous_set), _hrs(hrs),
+                           HeapRegionManager* hrm) :
+    _old_set(old_set), _humongous_set(humongous_set), _hrm(hrm),
     _old_count(), _humongous_count(), _free_count(){ }
 
   bool doHeapRegion(HeapRegion* hr) {
@@ -6949,19 +6949,19 @@
     if (hr->is_young()) {
       // TODO
     } else if (hr->startsHumongous()) {
-      assert(hr->containing_set() == _humongous_set, err_msg("Heap region %u is starts humongous but not in humongous set.", hr->hrs_index()));
+      assert(hr->containing_set() == _humongous_set, err_msg("Heap region %u is starts humongous but not in humongous set.", hr->hrm_index()));
       _humongous_count.increment(1u, hr->capacity());
     } else if (hr->is_empty()) {
-      assert(_hrs->is_free(hr), err_msg("Heap region %u is empty but not on the free list.", hr->hrs_index()));
+      assert(_hrm->is_free(hr), err_msg("Heap region %u is empty but not on the free list.", hr->hrm_index()));
       _free_count.increment(1u, hr->capacity());
     } else {
-      assert(hr->containing_set() == _old_set, err_msg("Heap region %u is old but not in the old set.", hr->hrs_index()));
+      assert(hr->containing_set() == _old_set, err_msg("Heap region %u is old but not in the old set.", hr->hrm_index()));
       _old_count.increment(1u, hr->capacity());
     }
     return false;
   }
 
-  void verify_counts(HeapRegionSet* old_set, HeapRegionSet* humongous_set, HeapRegionSeq* free_list) {
+  void verify_counts(HeapRegionSet* old_set, HeapRegionSet* humongous_set, HeapRegionManager* free_list) {
     guarantee(old_set->length() == _old_count.length(), err_msg("Old set count mismatch. Expected %u, actual %u.", old_set->length(), _old_count.length()));
     guarantee(old_set->total_capacity_bytes() == _old_count.capacity(), err_msg("Old set capacity mismatch. Expected " SIZE_FORMAT ", actual " SIZE_FORMAT,
         old_set->total_capacity_bytes(), _old_count.capacity()));
@@ -6980,7 +6980,7 @@
   assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */);
 
   // First, check the explicit lists.
-  _hrs.verify();
+  _hrm.verify();
   {
     // Given that a concurrent operation might be adding regions to
     // the secondary free list we have to take the lock before
@@ -7011,9 +7011,9 @@
   // Finally, make sure that the region accounting in the lists is
   // consistent with what we see in the heap.
 
-  VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_hrs);
+  VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_hrm);
   heap_region_iterate(&cl);
-  cl.verify_counts(&_old_set, &_humongous_set, &_hrs);
+  cl.verify_counts(&_old_set, &_humongous_set, &_hrm);
 }
 
 // Optimized nmethod scanning
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp
--- a/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -33,7 +33,7 @@
 #include "gc_implementation/g1/g1MonitoringSupport.hpp"
 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
 #include "gc_implementation/g1/g1YCTypes.hpp"
-#include "gc_implementation/g1/heapRegionSeq.hpp"
+#include "gc_implementation/g1/heapRegionManager.hpp"
 #include "gc_implementation/g1/heapRegionSet.hpp"
 #include "gc_implementation/shared/hSpaceCounters.hpp"
 #include "gc_implementation/shared/parGCAllocBuffer.hpp"
@@ -291,7 +291,7 @@
   G1RegionMappingChangedListener _listener;
 
   // The sequence of all heap regions in the heap.
-  HeapRegionSeq _hrs;
+  HeapRegionManager _hrm;
 
   // Alloc region used to satisfy mutator allocation requests.
   MutatorAllocRegion _mutator_alloc_region;
@@ -429,7 +429,7 @@
 
   // If the HR printer is active, dump the state of the regions in the
   // heap after a compaction.
-  void print_hrs_post_compaction();
+  void print_hrm_post_compaction();
 
   double verify(bool guard, const char* msg);
   void verify_before_gc();
@@ -715,7 +715,7 @@
   // We register a region with the fast "in collection set" test. We
   // simply set to true the array slot corresponding to this region.
   void register_region_with_in_cset_fast_test(HeapRegion* r) {
-    _in_cset_fast_test.set_in_cset(r->hrs_index());
+    _in_cset_fast_test.set_in_cset(r->hrm_index());
   }
 
   // This is a fast test on whether a reference points into the
@@ -1171,17 +1171,17 @@
   // But G1CollectedHeap doesn't yet support this.
 
   virtual bool is_maximal_no_gc() const {
-    return _hrs.available() == 0;
+    return _hrm.available() == 0;
   }
 
   // The current number of regions in the heap.
-  uint num_regions() const { return _hrs.length(); }
+  uint num_regions() const { return _hrm.length(); }
 
   // The max number of regions in the heap.
-  uint max_regions() const { return _hrs.max_length(); }
+  uint max_regions() const { return _hrm.max_length(); }
 
   // The number of regions that are completely free.
-  uint num_free_regions() const { return _hrs.num_free_regions(); }
+  uint num_free_regions() const { return _hrm.num_free_regions(); }
 
   // The number of regions that are not completely free.
   uint num_used_regions() const { return num_regions() - num_free_regions(); }
@@ -1233,7 +1233,7 @@
 
 #ifdef ASSERT
   bool is_on_master_free_list(HeapRegion* hr) {
-    return _hrs.is_free(hr);
+    return _hrm.is_free(hr);
   }
 #endif // ASSERT
 
@@ -1245,7 +1245,7 @@
   }
 
   void append_secondary_free_list() {
-    _hrs.insert_list_into_free_list(&_secondary_free_list);
+    _hrm.insert_list_into_free_list(&_secondary_free_list);
   }
 
   void append_secondary_free_list_if_not_empty_with_lock() {
@@ -1356,13 +1356,13 @@
   // Return "TRUE" iff the given object address is in the reserved
   // region of g1.
   bool is_in_g1_reserved(const void* p) const {
-    return _hrs.reserved().contains(p);
+    return _hrm.reserved().contains(p);
   }
 
   // Returns a MemRegion that corresponds to the space that has been
   // reserved for the heap
   MemRegion g1_reserved() const {
-    return _hrs.reserved();
+    return _hrm.reserved();
   }
 
   virtual bool is_in_closed_subset(const void* p) const;
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/g1CollectedHeap.inline.hpp
--- a/src/share/vm/gc_implementation/g1/g1CollectedHeap.inline.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/g1CollectedHeap.inline.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -30,15 +30,15 @@
 #include "gc_implementation/g1/g1AllocRegion.inline.hpp"
 #include "gc_implementation/g1/g1CollectorPolicy.hpp"
 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
+#include "gc_implementation/g1/heapRegionManager.inline.hpp"
 #include "gc_implementation/g1/heapRegionSet.inline.hpp"
-#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
 #include "runtime/orderAccess.inline.hpp"
 #include "utilities/taskqueue.hpp"
 
 // Inline functions for G1CollectedHeap
 
 // Return the region with the given index. It assumes the index is valid.
-inline HeapRegion* G1CollectedHeap::region_at(uint index) const { return _hrs.at(index); }
+inline HeapRegion* G1CollectedHeap::region_at(uint index) const { return _hrm.at(index); }
 
 inline uint G1CollectedHeap::addr_to_region(HeapWord* addr) const {
   assert(is_in_reserved(addr),
@@ -48,7 +48,7 @@
 }
 
 inline HeapWord* G1CollectedHeap::bottom_addr_for_region(uint index) const {
-  return _hrs.reserved().start() + index * HeapRegion::GrainWords;
+  return _hrm.reserved().start() + index * HeapRegion::GrainWords;
 }
 
 template <class T>
@@ -57,7 +57,7 @@
   assert(is_in_g1_reserved((const void*) addr),
       err_msg("Address "PTR_FORMAT" is outside of the heap ranging from ["PTR_FORMAT" to "PTR_FORMAT")",
           p2i((void*)addr), p2i(g1_reserved().start()), p2i(g1_reserved().end())));
-  return _hrs.addr_to_region((HeapWord*) addr);
+  return _hrm.addr_to_region((HeapWord*) addr);
 }
 
 template <class T>
@@ -87,7 +87,7 @@
 }
 
 inline bool G1CollectedHeap::obj_in_cs(oop obj) {
-  HeapRegion* r = _hrs.addr_to_region((HeapWord*) obj);
+  HeapRegion* r = _hrm.addr_to_region((HeapWord*) obj);
   return r != NULL && r->in_collection_set();
 }
 
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/g1RemSet.cpp
--- a/src/share/vm/gc_implementation/g1/g1RemSet.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/g1RemSet.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -32,7 +32,7 @@
 #include "gc_implementation/g1/g1GCPhaseTimes.hpp"
 #include "gc_implementation/g1/g1OopClosures.inline.hpp"
 #include "gc_implementation/g1/g1RemSet.inline.hpp"
-#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
+#include "gc_implementation/g1/heapRegionManager.inline.hpp"
 #include "gc_implementation/g1/heapRegionRemSet.hpp"
 #include "memory/iterator.hpp"
 #include "oops/oop.inline.hpp"
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/heapRegion.cpp
--- a/src/share/vm/gc_implementation/g1/heapRegion.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/heapRegion.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -29,7 +29,7 @@
 #include "gc_implementation/g1/g1OopClosures.inline.hpp"
 #include "gc_implementation/g1/heapRegion.inline.hpp"
 #include "gc_implementation/g1/heapRegionRemSet.hpp"
-#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
+#include "gc_implementation/g1/heapRegionManager.inline.hpp"
 #include "gc_implementation/shared/liveRange.hpp"
 #include "memory/genOopClosures.inline.hpp"
 #include "memory/iterator.hpp"
@@ -344,11 +344,11 @@
   return low;
 }
 
-HeapRegion::HeapRegion(uint hrs_index,
+HeapRegion::HeapRegion(uint hrm_index,
                        G1BlockOffsetSharedArray* sharedOffsetArray,
                        MemRegion mr) :
     G1OffsetTableContigSpace(sharedOffsetArray, mr),
-    _hrs_index(hrs_index),
+    _hrm_index(hrm_index),
     _humongous_type(NotHumongous), _humongous_start_region(NULL),
     _in_collection_set(false),
     _next_in_special_set(NULL), _orig_end(NULL),
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/heapRegion.hpp
--- a/src/share/vm/gc_implementation/g1/heapRegion.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/heapRegion.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -54,15 +54,15 @@
 
 #define HR_FORMAT "%u:(%s)["PTR_FORMAT","PTR_FORMAT","PTR_FORMAT"]"
 #define HR_FORMAT_PARAMS(_hr_) \
-                (_hr_)->hrs_index(), \
+                (_hr_)->hrm_index(), \
                 (_hr_)->is_survivor() ? "S" : (_hr_)->is_young() ? "E" : \
                 (_hr_)->startsHumongous() ? "HS" : \
                 (_hr_)->continuesHumongous() ? "HC" : \
                 !(_hr_)->is_empty() ? "O" : "F", \
                 p2i((_hr_)->bottom()), p2i((_hr_)->top()), p2i((_hr_)->end())
 
-// sentinel value for hrs_index
-#define G1_NO_HRS_INDEX ((uint) -1)
+// sentinel value for hrm_index
+#define G1_NO_HRM_INDEX ((uint) -1)
 
 // A dirty card to oop closure for heap regions. It
 // knows how to get the G1 heap and how to use the bitmap
@@ -234,7 +234,7 @@
 
  protected:
   // The index of this region in the heap region sequence.
-  uint  _hrs_index;
+  uint  _hrm_index;
 
   HumongousType _humongous_type;
   // For a humongous region, region in which it starts.
@@ -330,7 +330,7 @@
   size_t _predicted_bytes_to_copy;
 
  public:
-  HeapRegion(uint hrs_index,
+  HeapRegion(uint hrm_index,
              G1BlockOffsetSharedArray* sharedOffsetArray,
              MemRegion mr);
 
@@ -385,9 +385,9 @@
   inline HeapWord* par_allocate_no_bot_updates(size_t word_size);
   inline HeapWord* allocate_no_bot_updates(size_t word_size);
 
-  // If this region is a member of a HeapRegionSeq, the index in that
+  // If this region is a member of a HeapRegionManager, the index in that
   // sequence, otherwise -1.
-  uint hrs_index() const { return _hrs_index; }
+  uint hrm_index() const { return _hrm_index; }
 
   // The number of bytes marked live in the region in the last marking phase.
   size_t marked_bytes()    { return _prev_marked_bytes; }
@@ -458,7 +458,7 @@
   // with this HS region.
   uint last_hc_index() const {
     assert(startsHumongous(), "don't call this otherwise");
-    return hrs_index() + region_num();
+    return hrm_index() + region_num();
   }
 
   // Same as Space::is_in_reserved, but will use the original size of the region.
@@ -570,7 +570,7 @@
   void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; }
   bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; }
 
-  HeapWord* orig_end() { return _orig_end; }
+  HeapWord* orig_end() const { return _orig_end; }
 
   // Reset HR stuff to default values.
   void hr_clear(bool par, bool clear_space, bool locked = false);
@@ -813,7 +813,7 @@
 // HeapRegionClosure is used for iterating over regions.
 // Terminates the iteration when the "doHeapRegion" method returns "true".
 class HeapRegionClosure : public StackObj {
-  friend class HeapRegionSeq;
+  friend class HeapRegionManager;
   friend class G1CollectedHeap;
 
   bool _complete;
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/heapRegionManager.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/gc_implementation/g1/heapRegionManager.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -0,0 +1,446 @@
+/*
+ * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "gc_implementation/g1/heapRegion.hpp"
+#include "gc_implementation/g1/heapRegionManager.inline.hpp"
+#include "gc_implementation/g1/heapRegionSet.inline.hpp"
+#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
+#include "gc_implementation/g1/concurrentG1Refine.hpp"
+#include "memory/allocation.hpp"
+
+void HeapRegionManager::initialize(G1RegionToSpaceMapper* heap_storage,
+                               G1RegionToSpaceMapper* prev_bitmap,
+                               G1RegionToSpaceMapper* next_bitmap,
+                               G1RegionToSpaceMapper* bot,
+                               G1RegionToSpaceMapper* cardtable,
+                               G1RegionToSpaceMapper* card_counts) {
+  _allocated_heapregions_length = 0;
+
+  _heap_mapper = heap_storage;
+
+  _prev_bitmap_mapper = prev_bitmap;
+  _next_bitmap_mapper = next_bitmap;
+
+  _bot_mapper = bot;
+  _cardtable_mapper = cardtable;
+
+  _card_counts_mapper = card_counts;
+
+  MemRegion reserved = heap_storage->reserved();
+  _regions.initialize(reserved.start(), reserved.end(), HeapRegion::GrainBytes);
+
+  _available_map.resize(_regions.length(), false);
+  _available_map.clear();
+}
+
+bool HeapRegionManager::is_available(uint region) const {
+  return _available_map.at(region);
+}
+
+#ifdef ASSERT
+bool HeapRegionManager::is_free(HeapRegion* hr) const {
+  return _free_list.contains(hr);
+}
+#endif
+
+HeapRegion* HeapRegionManager::new_heap_region(uint hrm_index) {
+  HeapWord* bottom = G1CollectedHeap::heap()->bottom_addr_for_region(hrm_index);
+  MemRegion mr(bottom, bottom + HeapRegion::GrainWords);
+  assert(reserved().contains(mr), "invariant");
+  return new HeapRegion(hrm_index, G1CollectedHeap::heap()->bot_shared(), mr);
+}
+
+void HeapRegionManager::commit_regions(uint index, size_t num_regions) {
+  guarantee(num_regions > 0, "Must commit more than zero regions");
+  guarantee(_num_committed + num_regions <= max_length(), "Cannot commit more than the maximum amount of regions");
+
+  _num_committed += (uint)num_regions;
+
+  _heap_mapper->commit_regions(index, num_regions);
+
+  // Also commit auxiliary data
+  _prev_bitmap_mapper->commit_regions(index, num_regions);
+  _next_bitmap_mapper->commit_regions(index, num_regions);
+
+  _bot_mapper->commit_regions(index, num_regions);
+  _cardtable_mapper->commit_regions(index, num_regions);
+
+  _card_counts_mapper->commit_regions(index, num_regions);
+}
+
+void HeapRegionManager::uncommit_regions(uint start, size_t num_regions) {
+  guarantee(num_regions >= 1, err_msg("Need to specify at least one region to uncommit, tried to uncommit zero regions at %u", start));
+  guarantee(_num_committed >= num_regions, "pre-condition");
+
+  // Print before uncommitting.
+  if (G1CollectedHeap::heap()->hr_printer()->is_active()) {
+    for (uint i = start; i < start + num_regions; i++) {
+      HeapRegion* hr = at(i);
+      G1CollectedHeap::heap()->hr_printer()->uncommit(hr->bottom(), hr->end());
+    }
+  }
+
+  _num_committed -= (uint)num_regions;
+
+  _available_map.par_clear_range(start, start + num_regions, BitMap::unknown_range);
+  _heap_mapper->uncommit_regions(start, num_regions);
+
+  // Also uncommit auxiliary data
+  _prev_bitmap_mapper->uncommit_regions(start, num_regions);
+  _next_bitmap_mapper->uncommit_regions(start, num_regions);
+
+  _bot_mapper->uncommit_regions(start, num_regions);
+  _cardtable_mapper->uncommit_regions(start, num_regions);
+
+  _card_counts_mapper->uncommit_regions(start, num_regions);
+}
+
+void HeapRegionManager::make_regions_available(uint start, uint num_regions) {
+  guarantee(num_regions > 0, "No point in calling this for zero regions");
+  commit_regions(start, num_regions);
+  for (uint i = start; i < start + num_regions; i++) {
+    if (_regions.get_by_index(i) == NULL) {
+      HeapRegion* new_hr = new_heap_region(i);
+      _regions.set_by_index(i, new_hr);
+      _allocated_heapregions_length = MAX2(_allocated_heapregions_length, i + 1);
+    }
+  }
+
+  _available_map.par_set_range(start, start + num_regions, BitMap::unknown_range);
+
+  for (uint i = start; i < start + num_regions; i++) {
+    assert(is_available(i), err_msg("Just made region %u available but is apparently not.", i));
+    HeapRegion* hr = at(i);
+    if (G1CollectedHeap::heap()->hr_printer()->is_active()) {
+      G1CollectedHeap::heap()->hr_printer()->commit(hr->bottom(), hr->end());
+    }
+    HeapWord* bottom = G1CollectedHeap::heap()->bottom_addr_for_region(i);
+    MemRegion mr(bottom, bottom + HeapRegion::GrainWords);
+
+    hr->initialize(mr);
+    insert_into_free_list(at(i));
+  }
+}
+
+uint HeapRegionManager::expand_by(uint num_regions) {
+  return expand_at(0, num_regions);
+}
+
+uint HeapRegionManager::expand_at(uint start, uint num_regions) {
+  if (num_regions == 0) {
+    return 0;
+  }
+
+  uint cur = start;
+  uint idx_last_found = 0;
+  uint num_last_found = 0;
+
+  uint expanded = 0;
+
+  while (expanded < num_regions &&
+         (num_last_found = find_unavailable_from_idx(cur, &idx_last_found)) > 0) {
+    uint to_expand = MIN2(num_regions - expanded, num_last_found);
+    make_regions_available(idx_last_found, to_expand);
+    expanded += to_expand;
+    cur = idx_last_found + num_last_found + 1;
+  }
+
+  verify_optional();
+  return expanded;
+}
+
+uint HeapRegionManager::find_contiguous(size_t num, bool empty_only) {
+  uint found = 0;
+  size_t length_found = 0;
+  uint cur = 0;
+
+  while (length_found < num && cur < max_length()) {
+    HeapRegion* hr = _regions.get_by_index(cur);
+    if ((!empty_only && !is_available(cur)) || (is_available(cur) && hr != NULL && hr->is_empty())) {
+      // This region is a potential candidate for allocation into.
+      length_found++;
+    } else {
+      // This region is not a candidate. The next region is the next possible one.
+      found = cur + 1;
+      length_found = 0;
+    }
+    cur++;
+  }
+
+  if (length_found == num) {
+    for (uint i = found; i < (found + num); i++) {
+      HeapRegion* hr = _regions.get_by_index(i);
+      // sanity check
+      guarantee((!empty_only && !is_available(i)) || (is_available(i) && hr != NULL && hr->is_empty()),
+                err_msg("Found region sequence starting at " UINT32_FORMAT ", length " SIZE_FORMAT
+                        " that is not empty at " UINT32_FORMAT ". Hr is " PTR_FORMAT, found, num, i, p2i(hr)));
+    }
+    return found;
+  } else {
+    return G1_NO_HRM_INDEX;
+  }
+}
+
+HeapRegion* HeapRegionManager::next_region_in_heap(const HeapRegion* r) const {
+  guarantee(r != NULL, "Start region must be a valid region");
+  guarantee(is_available(r->hrm_index()), err_msg("Trying to iterate starting from region %u which is not in the heap", r->hrm_index()));
+  for (uint i = r->hrm_index() + 1; i < _allocated_heapregions_length; i++) {
+    HeapRegion* hr = _regions.get_by_index(i);
+    if (is_available(i)) {
+      return hr;
+    }
+  }
+  return NULL;
+}
+
+void HeapRegionManager::iterate(HeapRegionClosure* blk) const {
+  uint len = max_length();
+
+  for (uint i = 0; i < len; i++) {
+    if (!is_available(i)) {
+      continue;
+    }
+    guarantee(at(i) != NULL, err_msg("Tried to access region %u that has a NULL HeapRegion*", i));
+    bool res = blk->doHeapRegion(at(i));
+    if (res) {
+      blk->incomplete();
+      return;
+    }
+  }
+}
+
+uint HeapRegionManager::find_unavailable_from_idx(uint start_idx, uint* res_idx) const {
+  guarantee(res_idx != NULL, "checking");
+  guarantee(start_idx <= (max_length() + 1), "checking");
+
+  uint num_regions = 0;
+
+  uint cur = start_idx;
+  while (cur < max_length() && is_available(cur)) {
+    cur++;
+  }
+  if (cur == max_length()) {
+    return num_regions;
+  }
+  *res_idx = cur;
+  while (cur < max_length() && !is_available(cur)) {
+    cur++;
+  }
+  num_regions = cur - *res_idx;
+#ifdef ASSERT
+  for (uint i = *res_idx; i < (*res_idx + num_regions); i++) {
+    assert(!is_available(i), "just checking");
+  }
+  assert(cur == max_length() || num_regions == 0 || is_available(cur),
+         err_msg("The region at the current position %u must be available or at the end of the heap.", cur));
+#endif
+  return num_regions;
+}
+
+uint HeapRegionManager::start_region_for_worker(uint worker_i, uint num_workers, uint num_regions) const {
+  return num_regions * worker_i / num_workers;
+}
+
+void HeapRegionManager::par_iterate(HeapRegionClosure* blk, uint worker_id, uint num_workers, jint claim_value) const {
+  const uint start_index = start_region_for_worker(worker_id, num_workers, _allocated_heapregions_length);
+
+  // Every worker will actually look at all regions, skipping over regions that
+  // are currently not committed.
+  // This also (potentially) iterates over regions newly allocated during GC. This
+  // is no problem except for some extra work.
+  for (uint count = 0; count < _allocated_heapregions_length; count++) {
+    const uint index = (start_index + count) % _allocated_heapregions_length;
+    assert(0 <= index && index < _allocated_heapregions_length, "sanity");
+    // Skip over unavailable regions
+    if (!is_available(index)) {
+      continue;
+    }
+    HeapRegion* r = _regions.get_by_index(index);
+    // We'll ignore "continues humongous" regions (we'll process them
+    // when we come across their corresponding "start humongous"
+    // region) and regions already claimed.
+    if (r->claim_value() == claim_value || r->continuesHumongous()) {
+      continue;
+    }
+    // OK, try to claim it
+    if (!r->claimHeapRegion(claim_value)) {
+      continue;
+    }
+    // Success!
+    if (r->startsHumongous()) {
+      // If the region is "starts humongous" we'll iterate over its
+      // "continues humongous" first; in fact we'll do them
+      // first. The order is important. In one case, calling the
+      // closure on the "starts humongous" region might de-allocate
+      // and clear all its "continues humongous" regions and, as a
+      // result, we might end up processing them twice. So, we'll do
+      // them first (note: most closures will ignore them anyway) and
+      // then we'll do the "starts humongous" region.
+      for (uint ch_index = index + 1; ch_index < index + r->region_num(); ch_index++) {
+        HeapRegion* chr = _regions.get_by_index(ch_index);
+
+        assert(chr->continuesHumongous(), "Must be humongous region");
+        assert(chr->humongous_start_region() == r,
+               err_msg("Must work on humongous continuation of the original start region "
+                       PTR_FORMAT ", but is " PTR_FORMAT, p2i(r), p2i(chr)));
+        assert(chr->claim_value() != claim_value,
+               "Must not have been claimed yet because claiming of humongous continuation first claims the start region");
+
+        bool claim_result = chr->claimHeapRegion(claim_value);
+        // We should always be able to claim it; no one else should
+        // be trying to claim this region.
+        guarantee(claim_result, "We should always be able to claim the continuesHumongous part of the humongous object");
+
+        bool res2 = blk->doHeapRegion(chr);
+        if (res2) {
+          return;
+        }
+
+        // Right now, this holds (i.e., no closure that actually
+        // does something with "continues humongous" regions
+        // clears them). We might have to weaken it in the future,
+        // but let's leave these two asserts here for extra safety.
+        assert(chr->continuesHumongous(), "should still be the case");
+        assert(chr->humongous_start_region() == r, "sanity");
+      }
+    }
+
+    bool res = blk->doHeapRegion(r);
+    if (res) {
+      return;
+    }
+  }
+}
+
+uint HeapRegionManager::shrink_by(uint num_regions_to_remove) {
+  assert(length() > 0, "the region sequence should not be empty");
+  assert(length() <= _allocated_heapregions_length, "invariant");
+  assert(_allocated_heapregions_length > 0, "we should have at least one region committed");
+  assert(num_regions_to_remove < length(), "We should never remove all regions");
+
+  if (num_regions_to_remove == 0) {
+    return 0;
+  }
+
+  uint removed = 0;
+  uint cur = _allocated_heapregions_length - 1;
+  uint idx_last_found = 0;
+  uint num_last_found = 0;
+
+  while ((removed < num_regions_to_remove) &&
+      (num_last_found = find_empty_from_idx_reverse(cur, &idx_last_found)) > 0) {
+    uint to_remove = MIN2(num_regions_to_remove - removed, num_last_found);
+
+    uncommit_regions(idx_last_found + num_last_found - to_remove, to_remove);
+
+    cur -= num_last_found;
+    removed += to_remove;
+  }
+
+  verify_optional();
+
+  return removed;
+}
+
+uint HeapRegionManager::find_empty_from_idx_reverse(uint start_idx, uint* res_idx) const {
+  guarantee(start_idx < _allocated_heapregions_length, "checking");
+  guarantee(res_idx != NULL, "checking");
+
+  uint num_regions_found = 0;
+
+  jlong cur = start_idx;
+  while (cur != -1 && !(is_available(cur) && at(cur)->is_empty())) {
+    cur--;
+  }
+  if (cur == -1) {
+    return num_regions_found;
+  }
+  jlong old_cur = cur;
+  // cur indexes the first empty region
+  while (cur != -1 && is_available(cur) && at(cur)->is_empty()) {
+    cur--;
+  }
+  *res_idx = cur + 1;
+  num_regions_found = old_cur - cur;
+
+#ifdef ASSERT
+  for (uint i = *res_idx; i < (*res_idx + num_regions_found); i++) {
+    assert(at(i)->is_empty(), "just checking");
+  }
+#endif
+  return num_regions_found;
+}
+
+void HeapRegionManager::verify() {
+  guarantee(length() <= _allocated_heapregions_length,
+            err_msg("invariant: _length: %u _allocated_length: %u",
+                    length(), _allocated_heapregions_length));
+  guarantee(_allocated_heapregions_length <= max_length(),
+            err_msg("invariant: _allocated_length: %u _max_length: %u",
+                    _allocated_heapregions_length, max_length()));
+
+  bool prev_committed = true;
+  uint num_committed = 0;
+  HeapWord* prev_end = heap_bottom();
+  for (uint i = 0; i < _allocated_heapregions_length; i++) {
+    if (!is_available(i)) {
+      prev_committed = false;
+      continue;
+    }
+    num_committed++;
+    HeapRegion* hr = _regions.get_by_index(i);
+    guarantee(hr != NULL, err_msg("invariant: i: %u", i));
+    guarantee(!prev_committed || hr->bottom() == prev_end,
+              err_msg("invariant i: %u "HR_FORMAT" prev_end: "PTR_FORMAT,
+                      i, HR_FORMAT_PARAMS(hr), p2i(prev_end)));
+    guarantee(hr->hrm_index() == i,
+              err_msg("invariant: i: %u hrm_index(): %u", i, hr->hrm_index()));
+    // Asserts will fire if i is >= _length
+    HeapWord* addr = hr->bottom();
+    guarantee(addr_to_region(addr) == hr, "sanity");
+    // We cannot check whether the region is part of a particular set: at the time
+    // this method may be called, we have only completed allocation of the regions,
+    // but not put into a region set.
+    prev_committed = true;
+    if (hr->startsHumongous()) {
+      prev_end = hr->orig_end();
+    } else {
+      prev_end = hr->end();
+    }
+  }
+  for (uint i = _allocated_heapregions_length; i < max_length(); i++) {
+    guarantee(_regions.get_by_index(i) == NULL, err_msg("invariant i: %u", i));
+  }
+
+  guarantee(num_committed == _num_committed, err_msg("Found %u committed regions, but should be %u", num_committed, _num_committed));
+  _free_list.verify();
+}
+
+#ifndef PRODUCT
+void HeapRegionManager::verify_optional() {
+  verify();
+}
+#endif // PRODUCT
+
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/heapRegionManager.hpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/gc_implementation/g1/heapRegionManager.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -0,0 +1,238 @@
+/*
+ * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONMANAGER_HPP
+#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONMANAGER_HPP
+
+#include "gc_implementation/g1/g1BiasedArray.hpp"
+#include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
+#include "gc_implementation/g1/heapRegionSet.hpp"
+
+class HeapRegion;
+class HeapRegionClosure;
+class FreeRegionList;
+
+class G1HeapRegionTable : public G1BiasedMappedArray<HeapRegion*> {
+ protected:
+  virtual HeapRegion* default_value() const { return NULL; }
+};
+
+// This class keeps track of the actual heap memory, auxiliary data
+// and its metadata (i.e., HeapRegion instances) and the list of free regions.
+//
+// This allows maximum flexibility for deciding what to commit or uncommit given
+// a request from outside.
+//
+// HeapRegions are kept in the _regions array in address order. A region's
+// index in the array corresponds to its index in the heap (i.e., 0 is the
+// region at the bottom of the heap, 1 is the one after it, etc.). Two
+// regions that are consecutive in the array should also be adjacent in the
+// address space (i.e., region(i).end() == region(i+1).bottom().
+//
+// We create a HeapRegion when we commit the region's address space
+// for the first time. When we uncommit the address space of a
+// region we retain the HeapRegion to be able to re-use it in the
+// future (in case we recommit it).
+//
+// We keep track of three lengths:
+//
+// * _num_committed (returned by length()) is the number of currently
+//   committed regions. These may not be contiguous.
+// * _allocated_heapregions_length (not exposed outside this class) is the
+//   number of regions+1 for which we have HeapRegions.
+// * max_length() returns the maximum number of regions the heap can have.
+//
+
+class HeapRegionManager: public CHeapObj<mtGC> {
+  friend class VMStructs;
+
+  G1HeapRegionTable _regions;
+
+  G1RegionToSpaceMapper* _heap_mapper;
+  G1RegionToSpaceMapper* _prev_bitmap_mapper;
+  G1RegionToSpaceMapper* _next_bitmap_mapper;
+  G1RegionToSpaceMapper* _bot_mapper;
+  G1RegionToSpaceMapper* _cardtable_mapper;
+  G1RegionToSpaceMapper* _card_counts_mapper;
+
+  FreeRegionList _free_list;
+
+  // Each bit in this bitmap indicates that the corresponding region is available
+  // for allocation.
+  BitMap _available_map;
+
+   // The number of regions committed in the heap.
+  uint _num_committed;
+
+  // Internal only. The highest heap region +1 we allocated a HeapRegion instance for.
+  uint _allocated_heapregions_length;
+
+   HeapWord* heap_bottom() const { return _regions.bottom_address_mapped(); }
+   HeapWord* heap_end() const {return _regions.end_address_mapped(); }
+
+  void make_regions_available(uint index, uint num_regions = 1);
+
+  // Pass down commit calls to the VirtualSpace.
+  void commit_regions(uint index, size_t num_regions = 1);
+  void uncommit_regions(uint index, size_t num_regions = 1);
+
+  // Notify other data structures about change in the heap layout.
+  void update_committed_space(HeapWord* old_end, HeapWord* new_end);
+  // Calculate the starting region for each worker during parallel iteration so
+  // that they do not all start from the same region.
+  uint start_region_for_worker(uint worker_i, uint num_workers, uint num_regions) const;
+
+  // Find a contiguous set of empty or uncommitted regions of length num and return
+  // the index of the first region or G1_NO_HRM_INDEX if the search was unsuccessful.
+  // If only_empty is true, only empty regions are considered.
+  // Searches from bottom to top of the heap, doing a first-fit.
+  uint find_contiguous(size_t num, bool only_empty);
+  // Finds the next sequence of unavailable regions starting from start_idx. Returns the
+  // length of the sequence found. If this result is zero, no such sequence could be found,
+  // otherwise res_idx indicates the start index of these regions.
+  uint find_unavailable_from_idx(uint start_idx, uint* res_idx) const;
+  // Finds the next sequence of empty regions starting from start_idx, going backwards in
+  // the heap. Returns the length of the sequence found. If this value is zero, no
+  // sequence could be found, otherwise res_idx contains the start index of this range.
+  uint find_empty_from_idx_reverse(uint start_idx, uint* res_idx) const;
+  // Allocate a new HeapRegion for the given index.
+  HeapRegion* new_heap_region(uint hrm_index);
+#ifdef ASSERT
+public:
+  bool is_free(HeapRegion* hr) const;
+#endif
+  // Returns whether the given region is available for allocation.
+  bool is_available(uint region) const;
+
+ public:
+  // Empty constructor, we'll initialize it with the initialize() method.
+  HeapRegionManager() : _regions(), _heap_mapper(NULL), _num_committed(0),
+                    _next_bitmap_mapper(NULL), _prev_bitmap_mapper(NULL), _bot_mapper(NULL),
+                    _allocated_heapregions_length(0), _available_map(),
+                    _free_list("Free list", new MasterFreeRegionListMtSafeChecker())
+  { }
+
+  void initialize(G1RegionToSpaceMapper* heap_storage,
+                  G1RegionToSpaceMapper* prev_bitmap,
+                  G1RegionToSpaceMapper* next_bitmap,
+                  G1RegionToSpaceMapper* bot,
+                  G1RegionToSpaceMapper* cardtable,
+                  G1RegionToSpaceMapper* card_counts);
+
+  // Return the "dummy" region used for G1AllocRegion. This is currently a hardwired
+  // new HeapRegion that owns HeapRegion at index 0. Since at the moment we commit
+  // the heap from the lowest address, this region (and its associated data
+  // structures) are available and we do not need to check further.
+  HeapRegion* get_dummy_region() { return new_heap_region(0); }
+
+  // Return the HeapRegion at the given index. Assume that the index
+  // is valid.
+  inline HeapRegion* at(uint index) const;
+
+  // If addr is within the committed space return its corresponding
+  // HeapRegion, otherwise return NULL.
+  inline HeapRegion* addr_to_region(HeapWord* addr) const;
+
+  // Insert the given region into the free region list.
+  inline void insert_into_free_list(HeapRegion* hr);
+
+  // Insert the given region list into the global free region list.
+  void insert_list_into_free_list(FreeRegionList* list) {
+    _free_list.add_ordered(list);
+  }
+
+  HeapRegion* allocate_free_region(bool is_old) {
+    HeapRegion* hr = _free_list.remove_region(is_old);
+
+    if (hr != NULL) {
+      assert(hr->next() == NULL, "Single region should not have next");
+      assert(is_available(hr->hrm_index()), "Must be committed");
+    }
+    return hr;
+  }
+
+  inline void allocate_free_regions_starting_at(uint first, uint num_regions);
+
+  // Remove all regions from the free list.
+  void remove_all_free_regions() {
+    _free_list.remove_all();
+  }
+
+  // Return the number of committed free regions in the heap.
+  uint num_free_regions() const {
+    return _free_list.length();
+  }
+
+  size_t total_capacity_bytes() const {
+    return num_free_regions() * HeapRegion::GrainBytes;
+  }
+
+  // Return the number of available (uncommitted) regions.
+  uint available() const { return max_length() - length(); }
+
+  // Return the number of regions that have been committed in the heap.
+  uint length() const { return _num_committed; }
+
+  // Return the maximum number of regions in the heap.
+  uint max_length() const { return (uint)_regions.length(); }
+
+  MemRegion reserved() const { return MemRegion(heap_bottom(), heap_end()); }
+
+  // Expand the sequence to reflect that the heap has grown. Either create new
+  // HeapRegions, or re-use existing ones. Returns the number of regions the
+  // sequence was expanded by. If a HeapRegion allocation fails, the resulting
+  // number of regions might be smaller than what's desired.
+  uint expand_by(uint num_regions);
+
+  // Makes sure that the regions from start to start+num_regions-1 are available
+  // for allocation. Returns the number of regions that were committed to achieve
+  // this.
+  uint expand_at(uint start, uint num_regions);
+
+  // Find a contiguous set of empty regions of length num. Returns the start index of
+  // that set, or G1_NO_HRM_INDEX.
+  uint find_contiguous_only_empty(size_t num) { return find_contiguous(num, true); }
+  // Find a contiguous set of empty or unavailable regions of length num. Returns the
+  // start index of that set, or G1_NO_HRM_INDEX.
+  uint find_contiguous_empty_or_unavailable(size_t num) { return find_contiguous(num, false); }
+
+  HeapRegion* next_region_in_heap(const HeapRegion* r) const;
+
+  // Apply blk->doHeapRegion() on all committed regions in address order,
+  // terminating the iteration early if doHeapRegion() returns true.
+  void iterate(HeapRegionClosure* blk) const;
+
+  void par_iterate(HeapRegionClosure* blk, uint worker_id, uint no_of_par_workers, jint claim_value) const;
+
+  // Uncommit up to num_regions_to_remove regions that are completely free.
+  // Return the actual number of uncommitted regions.
+  uint shrink_by(uint num_regions_to_remove);
+
+  void verify();
+
+  // Do some sanity checking.
+  void verify_optional() PRODUCT_RETURN;
+};
+
+#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONMANAGER_HPP
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/heapRegionManager.inline.hpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/gc_implementation/g1/heapRegionManager.inline.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONMANAGER_INLINE_HPP
+#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONMANAGER_INLINE_HPP
+
+#include "gc_implementation/g1/heapRegion.hpp"
+#include "gc_implementation/g1/heapRegionManager.hpp"
+#include "gc_implementation/g1/heapRegionSet.inline.hpp"
+
+inline HeapRegion* HeapRegionManager::addr_to_region(HeapWord* addr) const {
+  assert(addr < heap_end(),
+        err_msg("addr: "PTR_FORMAT" end: "PTR_FORMAT, p2i(addr), p2i(heap_end())));
+  assert(addr >= heap_bottom(),
+        err_msg("addr: "PTR_FORMAT" bottom: "PTR_FORMAT, p2i(addr), p2i(heap_bottom())));
+
+  HeapRegion* hr = _regions.get_by_address(addr);
+  return hr;
+}
+
+inline HeapRegion* HeapRegionManager::at(uint index) const {
+  assert(is_available(index), "pre-condition");
+  HeapRegion* hr = _regions.get_by_index(index);
+  assert(hr != NULL, "sanity");
+  assert(hr->hrm_index() == index, "sanity");
+  return hr;
+}
+
+inline void HeapRegionManager::insert_into_free_list(HeapRegion* hr) {
+  _free_list.add_ordered(hr);
+}
+
+inline void HeapRegionManager::allocate_free_regions_starting_at(uint first, uint num_regions) {
+  _free_list.remove_starting_at(at(first), num_regions);
+}
+
+#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONMANAGER_INLINE_HPP
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp
--- a/src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -27,7 +27,7 @@
 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp"
 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
 #include "gc_implementation/g1/heapRegionRemSet.hpp"
-#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
+#include "gc_implementation/g1/heapRegionManager.inline.hpp"
 #include "memory/allocation.hpp"
 #include "memory/padded.inline.hpp"
 #include "memory/space.inline.hpp"
@@ -419,7 +419,7 @@
 }
 
 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) {
-  uint cur_hrs_ind = hr()->hrs_index();
+  uint cur_hrm_ind = hr()->hrm_index();
 
   if (G1TraceHeapRegionRememberedSet) {
     gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").",
@@ -434,10 +434,10 @@
   if (G1TraceHeapRegionRememberedSet) {
     gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = "INT32_FORMAT")",
                   hr()->bottom(), from_card,
-                  FromCardCache::at((uint)tid, cur_hrs_ind));
+                  FromCardCache::at((uint)tid, cur_hrm_ind));
   }
 
-  if (FromCardCache::contains_or_replace((uint)tid, cur_hrs_ind, from_card)) {
+  if (FromCardCache::contains_or_replace((uint)tid, cur_hrm_ind, from_card)) {
     if (G1TraceHeapRegionRememberedSet) {
       gclog_or_tty->print_cr("  from-card cache hit.");
     }
@@ -447,7 +447,7 @@
 
   // Note that this may be a continued H region.
   HeapRegion* from_hr = _g1h->heap_region_containing_raw(from);
-  RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index();
+  RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrm_index();
 
   // If the region is already coarsened, return.
   if (_coarse_map.at(from_hrs_ind)) {
@@ -493,8 +493,8 @@
       } else {
         if (G1TraceHeapRegionRememberedSet) {
           gclog_or_tty->print_cr("   [tid %d] sparse table entry "
-                        "overflow(f: %d, t: %d)",
-                        tid, from_hrs_ind, cur_hrs_ind);
+                        "overflow(f: %d, t: %u)",
+                        tid, from_hrs_ind, cur_hrm_ind);
         }
       }
 
@@ -606,9 +606,9 @@
   guarantee(max != NULL, "Since _n_fine_entries > 0");
 
   // Set the corresponding coarse bit.
-  size_t max_hrs_index = (size_t) max->hr()->hrs_index();
-  if (!_coarse_map.at(max_hrs_index)) {
-    _coarse_map.at_put(max_hrs_index, true);
+  size_t max_hrm_index = (size_t) max->hr()->hrm_index();
+  if (!_coarse_map.at(max_hrm_index)) {
+    _coarse_map.at_put(max_hrm_index, true);
     _n_coarse_entries++;
     if (G1TraceHeapRegionRememberedSet) {
       gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] "
@@ -632,7 +632,7 @@
                               BitMap* region_bm, BitMap* card_bm) {
   // First eliminated garbage regions from the coarse map.
   if (G1RSScrubVerbose) {
-    gclog_or_tty->print_cr("Scrubbing region %u:", hr()->hrs_index());
+    gclog_or_tty->print_cr("Scrubbing region %u:", hr()->hrm_index());
   }
 
   assert(_coarse_map.size() == region_bm->size(), "Precondition");
@@ -655,9 +655,9 @@
       // If the entire region is dead, eliminate.
       if (G1RSScrubVerbose) {
         gclog_or_tty->print_cr("     For other region %u:",
-                               cur->hr()->hrs_index());
+                               cur->hr()->hrm_index());
       }
-      if (!region_bm->at((size_t) cur->hr()->hrs_index())) {
+      if (!region_bm->at((size_t) cur->hr()->hrm_index())) {
         *prev = nxt;
         cur->set_collision_list_next(NULL);
         _n_fine_entries--;
@@ -751,7 +751,7 @@
 }
 
 void OtherRegionsTable::clear_fcc() {
-  FromCardCache::clear(hr()->hrs_index());
+  FromCardCache::clear(hr()->hrm_index());
 }
 
 void OtherRegionsTable::clear() {
@@ -802,7 +802,7 @@
 
 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const {
   HeapRegion* hr = _g1h->heap_region_containing_raw(from);
-  RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index();
+  RegionIdx_t hr_ind = (RegionIdx_t) hr->hrm_index();
   // Is this region in the coarse map?
   if (_coarse_map.at(hr_ind)) return true;
 
@@ -839,7 +839,7 @@
 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa,
                                    HeapRegion* hr)
   : _bosa(bosa),
-    _m(Mutex::leaf, FormatBuffer<128>("HeapRegionRemSet lock #%u", hr->hrs_index()), true),
+    _m(Mutex::leaf, FormatBuffer<128>("HeapRegionRemSet lock #%u", hr->hrm_index()), true),
     _code_roots(), _other_regions(hr, &_m), _iter_state(Unclaimed), _iter_claimed(0) {
   reset_for_par_iteration();
 }
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/heapRegionSeq.cpp
--- a/src/share/vm/gc_implementation/g1/heapRegionSeq.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,450 +0,0 @@
-/*
- * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- *
- */
-
-#include "precompiled.hpp"
-#include "gc_implementation/g1/heapRegion.hpp"
-#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
-#include "gc_implementation/g1/heapRegionSet.inline.hpp"
-#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
-#include "gc_implementation/g1/concurrentG1Refine.hpp"
-#include "memory/allocation.hpp"
-
-void HeapRegionSeq::initialize(G1RegionToSpaceMapper* heap_storage,
-                               G1RegionToSpaceMapper* prev_bitmap,
-                               G1RegionToSpaceMapper* next_bitmap,
-                               G1RegionToSpaceMapper* bot,
-                               G1RegionToSpaceMapper* cardtable,
-                               G1RegionToSpaceMapper* card_counts) {
-  _allocated_heapregions_length = 0;
-
-  _heap_mapper = heap_storage;
-
-  _prev_bitmap_mapper = prev_bitmap;
-  _next_bitmap_mapper = next_bitmap;
-
-  _bot_mapper = bot;
-  _cardtable_mapper = cardtable;
-
-  _card_counts_mapper = card_counts;
-
-  MemRegion reserved = heap_storage->reserved();
-  _regions.initialize(reserved.start(), reserved.end(), HeapRegion::GrainBytes);
-
-  _available_map.resize(_regions.length(), false);
-  _available_map.clear();
-}
-
-bool HeapRegionSeq::is_available(uint region) const {
-  return _available_map.at(region);
-}
-
-#ifdef ASSERT
-bool HeapRegionSeq::is_free(HeapRegion* hr) const {
-  return _free_list.contains(hr);
-}
-#endif
-
-HeapRegion* HeapRegionSeq::new_heap_region(uint hrs_index) {
-  HeapWord* bottom = G1CollectedHeap::heap()->bottom_addr_for_region(hrs_index);
-  MemRegion mr(bottom, bottom + HeapRegion::GrainWords);
-  assert(reserved().contains(mr), "invariant");
-  return new HeapRegion(hrs_index, G1CollectedHeap::heap()->bot_shared(), mr);
-}
-
-void HeapRegionSeq::commit_regions(uint index, size_t num_regions) {
-  guarantee(num_regions > 0, "Must commit more than zero regions");
-  guarantee(_num_committed + num_regions <= max_length(), "Cannot commit more than the maximum amount of regions");
-
-  _num_committed += (uint)num_regions;
-
-  _heap_mapper->commit_regions(index, num_regions);
-
-  // Also commit auxiliary data
-  _prev_bitmap_mapper->commit_regions(index, num_regions);
-  _next_bitmap_mapper->commit_regions(index, num_regions);
-
-  _bot_mapper->commit_regions(index, num_regions);
-  _cardtable_mapper->commit_regions(index, num_regions);
-
-  _card_counts_mapper->commit_regions(index, num_regions);
-}
-
-void HeapRegionSeq::uncommit_regions(uint start, size_t num_regions) {
-  guarantee(num_regions >= 1, err_msg("Need to specify at least one region to uncommit, tried to uncommit zero regions at %u", start));
-  guarantee(_num_committed >= num_regions, "pre-condition");
-
-  // Print before uncommitting.
-  if (G1CollectedHeap::heap()->hr_printer()->is_active()) {
-    for (uint i = start; i < start + num_regions; i++) {
-      HeapRegion* hr = at(i);
-      G1CollectedHeap::heap()->hr_printer()->uncommit(hr->bottom(), hr->end());
-    }
-  }
-
-  _num_committed -= (uint)num_regions;
-
-  _available_map.par_clear_range(start, start + num_regions, BitMap::unknown_range);
-  _heap_mapper->uncommit_regions(start, num_regions);
-
-  // Also uncommit auxiliary data
-  _prev_bitmap_mapper->uncommit_regions(start, num_regions);
-  _next_bitmap_mapper->uncommit_regions(start, num_regions);
-
-  _bot_mapper->uncommit_regions(start, num_regions);
-  _cardtable_mapper->uncommit_regions(start, num_regions);
-
-  _card_counts_mapper->uncommit_regions(start, num_regions);
-}
-
-void HeapRegionSeq::make_regions_available(uint start, uint num_regions) {
-  guarantee(num_regions > 0, "No point in calling this for zero regions");
-  commit_regions(start, num_regions);
-  for (uint i = start; i < start + num_regions; i++) {
-    if (_regions.get_by_index(i) == NULL) {
-      HeapRegion* new_hr = new_heap_region(i);
-      _regions.set_by_index(i, new_hr);
-      _allocated_heapregions_length = MAX2(_allocated_heapregions_length, i + 1);
-    }
-  }
-
-  _available_map.par_set_range(start, start + num_regions, BitMap::unknown_range);
-
-  for (uint i = start; i < start + num_regions; i++) {
-    assert(is_available(i), err_msg("Just made region %u available but is apparently not.", i));
-    HeapRegion* hr = at(i);
-    if (G1CollectedHeap::heap()->hr_printer()->is_active()) {
-      G1CollectedHeap::heap()->hr_printer()->commit(hr->bottom(), hr->end());
-    }
-    HeapWord* bottom = G1CollectedHeap::heap()->bottom_addr_for_region(i);
-    MemRegion mr(bottom, bottom + HeapRegion::GrainWords);
-
-    hr->initialize(mr);
-    insert_into_free_list(at(i));
-  }
-}
-
-uint HeapRegionSeq::expand_by(uint num_regions) {
-  return expand_at(0, num_regions);
-}
-
-uint HeapRegionSeq::expand_at(uint start, uint num_regions) {
-  if (num_regions == 0) {
-    return 0;
-  }
-
-  uint cur = start;
-  uint idx_last_found = 0;
-  uint num_last_found = 0;
-
-  uint expanded = 0;
-
-  while (expanded < num_regions &&
-         (num_last_found = find_unavailable_from_idx(cur, &idx_last_found)) > 0) {
-    uint to_expand = MIN2(num_regions - expanded, num_last_found);
-    make_regions_available(idx_last_found, to_expand);
-    expanded += to_expand;
-    cur = idx_last_found + num_last_found + 1;
-  }
-
-  verify_optional();
-  return expanded;
-}
-
-uint HeapRegionSeq::find_contiguous(size_t num, bool empty_only) {
-  uint found = 0;
-  size_t length_found = 0;
-  uint cur = 0;
-
-  while (length_found < num && cur < max_length()) {
-    HeapRegion* hr = _regions.get_by_index(cur);
-    if ((!empty_only && !is_available(cur)) || (is_available(cur) && hr != NULL && hr->is_empty())) {
-      // This region is a potential candidate for allocation into.
-      length_found++;
-    } else {
-      // This region is not a candidate. The next region is the next possible one.
-      found = cur + 1;
-      length_found = 0;
-    }
-    cur++;
-  }
-
-  if (length_found == num) {
-    for (uint i = found; i < (found + num); i++) {
-      HeapRegion* hr = _regions.get_by_index(i);
-      // sanity check
-      guarantee((!empty_only && !is_available(i)) || (is_available(i) && hr != NULL && hr->is_empty()),
-                err_msg("Found region sequence starting at " UINT32_FORMAT ", length " SIZE_FORMAT
-                        " that is not empty at " UINT32_FORMAT ". Hr is " PTR_FORMAT, found, num, i, p2i(hr)));
-    }
-    return found;
-  } else {
-    return G1_NO_HRS_INDEX;
-  }
-}
-
-HeapRegion* HeapRegionSeq::next_region_in_heap(const HeapRegion* r) const {
-  guarantee(r != NULL, "Start region must be a valid region");
-  guarantee(is_available(r->hrs_index()), err_msg("Trying to iterate starting from region %u which is not in the heap", r->hrs_index()));
-  for (uint i = r->hrs_index() + 1; i < _allocated_heapregions_length; i++) {
-    HeapRegion* hr = _regions.get_by_index(i);
-    if (is_available(i)) {
-      return hr;
-    }
-  }
-  return NULL;
-}
-
-void HeapRegionSeq::iterate(HeapRegionClosure* blk) const {
-  uint len = max_length();
-
-  for (uint i = 0; i < len; i++) {
-    if (!is_available(i)) {
-      continue;
-    }
-    guarantee(at(i) != NULL, err_msg("Tried to access region %u that has a NULL HeapRegion*", i));
-    bool res = blk->doHeapRegion(at(i));
-    if (res) {
-      blk->incomplete();
-      return;
-    }
-  }
-}
-
-uint HeapRegionSeq::find_unavailable_from_idx(uint start_idx, uint* res_idx) const {
-  guarantee(res_idx != NULL, "checking");
-  guarantee(start_idx <= (max_length() + 1), "checking");
-
-  uint num_regions = 0;
-
-  uint cur = start_idx;
-  while (cur < max_length() && is_available(cur)) {
-    cur++;
-  }
-  if (cur == max_length()) {
-    return num_regions;
-  }
-  *res_idx = cur;
-  while (cur < max_length() && !is_available(cur)) {
-    cur++;
-  }
-  num_regions = cur - *res_idx;
-#ifdef ASSERT
-  for (uint i = *res_idx; i < (*res_idx + num_regions); i++) {
-    assert(!is_available(i), "just checking");
-  }
-  assert(cur == max_length() || num_regions == 0 || is_available(cur),
-         err_msg("The region at the current position %u must be available or at the end of the heap.", cur));
-#endif
-  return num_regions;
-}
-
-uint HeapRegionSeq::start_region_for_worker(uint worker_i, uint num_workers, uint num_regions) const {
-  return num_regions * worker_i / num_workers;
-}
-
-void HeapRegionSeq::par_iterate(HeapRegionClosure* blk, uint worker_id, uint num_workers, jint claim_value) const {
-  const uint start_index = start_region_for_worker(worker_id, num_workers, _allocated_heapregions_length);
-
-  // Every worker will actually look at all regions, skipping over regions that
-  // are currently not committed.
-  // This also (potentially) iterates over regions newly allocated during GC. This
-  // is no problem except for some extra work.
-  for (uint count = 0; count < _allocated_heapregions_length; count++) {
-    const uint index = (start_index + count) % _allocated_heapregions_length;
-    assert(0 <= index && index < _allocated_heapregions_length, "sanity");
-    // Skip over unavailable regions
-    if (!is_available(index)) {
-      continue;
-    }
-    HeapRegion* r = _regions.get_by_index(index);
-    // We'll ignore "continues humongous" regions (we'll process them
-    // when we come across their corresponding "start humongous"
-    // region) and regions already claimed.
-    if (r->claim_value() == claim_value || r->continuesHumongous()) {
-      continue;
-    }
-    // OK, try to claim it
-    if (!r->claimHeapRegion(claim_value)) {
-      continue;
-    }
-    // Success!
-    if (r->startsHumongous()) {
-      // If the region is "starts humongous" we'll iterate over its
-      // "continues humongous" first; in fact we'll do them
-      // first. The order is important. In one case, calling the
-      // closure on the "starts humongous" region might de-allocate
-      // and clear all its "continues humongous" regions and, as a
-      // result, we might end up processing them twice. So, we'll do
-      // them first (note: most closures will ignore them anyway) and
-      // then we'll do the "starts humongous" region.
-      for (uint ch_index = index + 1; ch_index < index + r->region_num(); ch_index++) {
-        HeapRegion* chr = _regions.get_by_index(ch_index);
-
-        assert(chr->continuesHumongous(), "Must be humongous region");
-        assert(chr->humongous_start_region() == r,
-               err_msg("Must work on humongous continuation of the original start region "
-                       PTR_FORMAT ", but is " PTR_FORMAT, p2i(r), p2i(chr)));
-        assert(chr->claim_value() != claim_value,
-               "Must not have been claimed yet because claiming of humongous continuation first claims the start region");
-
-        bool claim_result = chr->claimHeapRegion(claim_value);
-        // We should always be able to claim it; no one else should
-        // be trying to claim this region.
-        guarantee(claim_result, "We should always be able to claim the continuesHumongous part of the humongous object");
-
-        bool res2 = blk->doHeapRegion(chr);
-        if (res2) {
-          return;
-        }
-
-        // Right now, this holds (i.e., no closure that actually
-        // does something with "continues humongous" regions
-        // clears them). We might have to weaken it in the future,
-        // but let's leave these two asserts here for extra safety.
-        assert(chr->continuesHumongous(), "should still be the case");
-        assert(chr->humongous_start_region() == r, "sanity");
-      }
-    }
-
-    bool res = blk->doHeapRegion(r);
-    if (res) {
-      return;
-    }
-  }
-}
-
-uint HeapRegionSeq::shrink_by(uint num_regions_to_remove) {
-  assert(length() > 0, "the region sequence should not be empty");
-  assert(length() <= _allocated_heapregions_length, "invariant");
-  assert(_allocated_heapregions_length > 0, "we should have at least one region committed");
-  assert(num_regions_to_remove < length(), "We should never remove all regions");
-
-  if (num_regions_to_remove == 0) {
-    return 0;
-  }
-
-  uint removed = 0;
-  uint cur = _allocated_heapregions_length - 1;
-  uint idx_last_found = 0;
-  uint num_last_found = 0;
-
-  while ((removed < num_regions_to_remove) &&
-      (num_last_found = find_empty_from_idx_reverse(cur, &idx_last_found)) > 0) {
-    // Only allow uncommit from the end of the heap.
-    if ((idx_last_found + num_last_found) != _allocated_heapregions_length) {
-      return 0;
-    }
-    uint to_remove = MIN2(num_regions_to_remove - removed, num_last_found);
-
-    uncommit_regions(idx_last_found + num_last_found - to_remove, to_remove);
-
-    cur -= num_last_found;
-    removed += to_remove;
-  }
-
-  verify_optional();
-
-  return removed;
-}
-
-uint HeapRegionSeq::find_empty_from_idx_reverse(uint start_idx, uint* res_idx) const {
-  guarantee(start_idx < _allocated_heapregions_length, "checking");
-  guarantee(res_idx != NULL, "checking");
-
-  uint num_regions_found = 0;
-
-  jlong cur = start_idx;
-  while (cur != -1 && !(is_available(cur) && at(cur)->is_empty())) {
-    cur--;
-  }
-  if (cur == -1) {
-    return num_regions_found;
-  }
-  jlong old_cur = cur;
-  // cur indexes the first empty region
-  while (cur != -1 && is_available(cur) && at(cur)->is_empty()) {
-    cur--;
-  }
-  *res_idx = cur + 1;
-  num_regions_found = old_cur - cur;
-
-#ifdef ASSERT
-  for (uint i = *res_idx; i < (*res_idx + num_regions_found); i++) {
-    assert(at(i)->is_empty(), "just checking");
-  }
-#endif
-  return num_regions_found;
-}
-
-void HeapRegionSeq::verify() {
-  guarantee(length() <= _allocated_heapregions_length,
-            err_msg("invariant: _length: %u _allocated_length: %u",
-                    length(), _allocated_heapregions_length));
-  guarantee(_allocated_heapregions_length <= max_length(),
-            err_msg("invariant: _allocated_length: %u _max_length: %u",
-                    _allocated_heapregions_length, max_length()));
-
-  bool prev_committed = true;
-  uint num_committed = 0;
-  HeapWord* prev_end = heap_bottom();
-  for (uint i = 0; i < _allocated_heapregions_length; i++) {
-    if (!is_available(i)) {
-      prev_committed = false;
-      continue;
-    }
-    num_committed++;
-    HeapRegion* hr = _regions.get_by_index(i);
-    guarantee(hr != NULL, err_msg("invariant: i: %u", i));
-    guarantee(!prev_committed || hr->bottom() == prev_end,
-              err_msg("invariant i: %u "HR_FORMAT" prev_end: "PTR_FORMAT,
-                      i, HR_FORMAT_PARAMS(hr), p2i(prev_end)));
-    guarantee(hr->hrs_index() == i,
-              err_msg("invariant: i: %u hrs_index(): %u", i, hr->hrs_index()));
-    // Asserts will fire if i is >= _length
-    HeapWord* addr = hr->bottom();
-    guarantee(addr_to_region(addr) == hr, "sanity");
-    // We cannot check whether the region is part of a particular set: at the time
-    // this method may be called, we have only completed allocation of the regions,
-    // but not put into a region set.
-    prev_committed = true;
-    if (hr->startsHumongous()) {
-      prev_end = hr->orig_end();
-    } else {
-      prev_end = hr->end();
-    }
-  }
-  for (uint i = _allocated_heapregions_length; i < max_length(); i++) {
-    guarantee(_regions.get_by_index(i) == NULL, err_msg("invariant i: %u", i));
-  }
-
-  guarantee(num_committed == _num_committed, err_msg("Found %u committed regions, but should be %u", num_committed, _num_committed));
-  _free_list.verify();
-}
-
-#ifndef PRODUCT
-void HeapRegionSeq::verify_optional() {
-  verify();
-}
-#endif // PRODUCT
-
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/heapRegionSeq.hpp
--- a/src/share/vm/gc_implementation/g1/heapRegionSeq.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,238 +0,0 @@
-/*
- * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- *
- */
-
-#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP
-#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP
-
-#include "gc_implementation/g1/g1BiasedArray.hpp"
-#include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
-#include "gc_implementation/g1/heapRegionSet.hpp"
-
-class HeapRegion;
-class HeapRegionClosure;
-class FreeRegionList;
-
-class G1HeapRegionTable : public G1BiasedMappedArray<HeapRegion*> {
- protected:
-  virtual HeapRegion* default_value() const { return NULL; }
-};
-
-// This class keeps track of the actual heap memory, auxiliary data
-// and its metadata (i.e., HeapRegion instances) and the list of free regions.
-//
-// This allows maximum flexibility for deciding what to commit or uncommit given
-// a request from outside.
-//
-// HeapRegions are kept in the _regions array in address order. A region's
-// index in the array corresponds to its index in the heap (i.e., 0 is the
-// region at the bottom of the heap, 1 is the one after it, etc.). Two
-// regions that are consecutive in the array should also be adjacent in the
-// address space (i.e., region(i).end() == region(i+1).bottom().
-//
-// We create a HeapRegion when we commit the region's address space
-// for the first time. When we uncommit the address space of a
-// region we retain the HeapRegion to be able to re-use it in the
-// future (in case we recommit it).
-//
-// We keep track of three lengths:
-//
-// * _num_committed (returned by length()) is the number of currently
-//   committed regions. These may not be contiguous.
-// * _allocated_heapregions_length (not exposed outside this class) is the
-//   number of regions+1 for which we have HeapRegions.
-// * max_length() returns the maximum number of regions the heap can have.
-//
-
-class HeapRegionSeq: public CHeapObj<mtGC> {
-  friend class VMStructs;
-
-  G1HeapRegionTable _regions;
-
-  G1RegionToSpaceMapper* _heap_mapper;
-  G1RegionToSpaceMapper* _prev_bitmap_mapper;
-  G1RegionToSpaceMapper* _next_bitmap_mapper;
-  G1RegionToSpaceMapper* _bot_mapper;
-  G1RegionToSpaceMapper* _cardtable_mapper;
-  G1RegionToSpaceMapper* _card_counts_mapper;
-
-  FreeRegionList _free_list;
-
-  // Each bit in this bitmap indicates that the corresponding region is available
-  // for allocation.
-  BitMap _available_map;
-
-   // The number of regions committed in the heap.
-  uint _num_committed;
-
-  // Internal only. The highest heap region +1 we allocated a HeapRegion instance for.
-  uint _allocated_heapregions_length;
-
-   HeapWord* heap_bottom() const { return _regions.bottom_address_mapped(); }
-   HeapWord* heap_end() const {return _regions.end_address_mapped(); }
-
-  void make_regions_available(uint index, uint num_regions = 1);
-
-  // Pass down commit calls to the VirtualSpace.
-  void commit_regions(uint index, size_t num_regions = 1);
-  void uncommit_regions(uint index, size_t num_regions = 1);
-
-  // Notify other data structures about change in the heap layout.
-  void update_committed_space(HeapWord* old_end, HeapWord* new_end);
-  // Calculate the starting region for each worker during parallel iteration so
-  // that they do not all start from the same region.
-  uint start_region_for_worker(uint worker_i, uint num_workers, uint num_regions) const;
-
-  // Find a contiguous set of empty or uncommitted regions of length num and return
-  // the index of the first region or G1_NO_HRS_INDEX if the search was unsuccessful.
-  // If only_empty is true, only empty regions are considered.
-  // Searches from bottom to top of the heap, doing a first-fit.
-  uint find_contiguous(size_t num, bool only_empty);
-  // Finds the next sequence of unavailable regions starting from start_idx. Returns the
-  // length of the sequence found. If this result is zero, no such sequence could be found,
-  // otherwise res_idx indicates the start index of these regions.
-  uint find_unavailable_from_idx(uint start_idx, uint* res_idx) const;
-  // Finds the next sequence of empty regions starting from start_idx, going backwards in
-  // the heap. Returns the length of the sequence found. If this value is zero, no
-  // sequence could be found, otherwise res_idx contains the start index of this range.
-  uint find_empty_from_idx_reverse(uint start_idx, uint* res_idx) const;
-  // Allocate a new HeapRegion for the given index.
-  HeapRegion* new_heap_region(uint hrs_index);
-#ifdef ASSERT
-public:
-  bool is_free(HeapRegion* hr) const;
-#endif
-  // Returns whether the given region is available for allocation.
-  bool is_available(uint region) const;
-
-  public:
-   // Empty constructor, we'll initialize it with the initialize() method.
-  HeapRegionSeq() : _regions(), _heap_mapper(NULL), _num_committed(0),
-                    _next_bitmap_mapper(NULL), _prev_bitmap_mapper(NULL), _bot_mapper(NULL),
-                    _allocated_heapregions_length(0), _available_map(),
-                    _free_list("Free list", new MasterFreeRegionListMtSafeChecker())
-  { }
-
-  void initialize(G1RegionToSpaceMapper* heap_storage,
-                  G1RegionToSpaceMapper* prev_bitmap,
-                  G1RegionToSpaceMapper* next_bitmap,
-                  G1RegionToSpaceMapper* bot,
-                  G1RegionToSpaceMapper* cardtable,
-                  G1RegionToSpaceMapper* card_counts);
-
-  // Return the "dummy" region used for G1AllocRegion. This is currently a hardwired
-  // new HeapRegion that owns HeapRegion at index 0. Since at the moment we commit
-  // the heap from the lowest address, this region (and its associated data
-  // structures) are available and we do not need to check further.
-  HeapRegion* get_dummy_region() { return new_heap_region(0); }
-
-  // Return the HeapRegion at the given index. Assume that the index
-  // is valid.
-  inline HeapRegion* at(uint index) const;
-
-  // If addr is within the committed space return its corresponding
-  // HeapRegion, otherwise return NULL.
-  inline HeapRegion* addr_to_region(HeapWord* addr) const;
-
-  // Insert the given region into the free region list.
-  inline void insert_into_free_list(HeapRegion* hr);
-
-  // Insert the given region list into the global free region list.
-  void insert_list_into_free_list(FreeRegionList* list) {
-    _free_list.add_ordered(list);
-  }
-
-  HeapRegion* allocate_free_region(bool is_old) {
-    HeapRegion* hr = _free_list.remove_region(is_old);
-
-    if (hr != NULL) {
-      assert(hr->next() == NULL, "Single region should not have next");
-      assert(is_available(hr->hrs_index()), "Must be committed");
-    }
-    return hr;
-  }
-
-  inline void allocate_free_regions_starting_at(uint first, uint num_regions);
-
-  // Remove all regions from the free list.
-  void remove_all_free_regions() {
-    _free_list.remove_all();
-  }
-
-  // Return the number of committed free regions in the heap.
-  uint num_free_regions() const {
-    return _free_list.length();
-  }
-
-  size_t total_capacity_bytes() const {
-    return num_free_regions() * HeapRegion::GrainBytes;
-  }
-
-  // Return the number of available (uncommitted) regions.
-  uint available() const { return max_length() - length(); }
-
-  // Return the number of regions that have been committed in the heap.
-  uint length() const { return _num_committed; }
-
-  // Return the maximum number of regions in the heap.
-  uint max_length() const { return (uint)_regions.length(); }
-
-  MemRegion reserved() const { return MemRegion(heap_bottom(), heap_end()); }
-
-  // Expand the sequence to reflect that the heap has grown. Either create new
-  // HeapRegions, or re-use existing ones. Returns the number of regions the
-  // sequence was expanded by. If a HeapRegion allocation fails, the resulting
-  // number of regions might be smaller than what's desired.
-  uint expand_by(uint num_regions);
-
-  // Makes sure that the regions from start to start+num_regions-1 are available
-  // for allocation. Returns the number of regions that were committed to achieve
-  // this.
-  uint expand_at(uint start, uint num_regions);
-
-  // Find a contiguous set of empty regions of length num. Returns the start index of
-  // that set, or G1_NO_HRS_INDEX.
-  uint find_contiguous_only_empty(size_t num) { return find_contiguous(num, true); }
-  // Find a contiguous set of empty or unavailable regions of length num. Returns the
-  // start index of that set, or G1_NO_HRS_INDEX.
-  uint find_contiguous_empty_or_unavailable(size_t num) { return find_contiguous(num, false); }
-
-  HeapRegion* next_region_in_heap(const HeapRegion* r) const;
-
-  // Apply blk->doHeapRegion() on all committed regions in address order,
-  // terminating the iteration early if doHeapRegion() returns true.
-  void iterate(HeapRegionClosure* blk) const;
-
-  void par_iterate(HeapRegionClosure* blk, uint worker_id, uint no_of_par_workers, jint claim_value) const;
-
-  // Uncommit up to num_regions_to_remove regions that are completely free.
-  // Return the actual number of uncommitted regions.
-  uint shrink_by(uint num_regions_to_remove);
-
-  void verify();
-
-  // Do some sanity checking.
-  void verify_optional() PRODUCT_RETURN;
-};
-
-#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/heapRegionSeq.inline.hpp
--- a/src/share/vm/gc_implementation/g1/heapRegionSeq.inline.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,58 +0,0 @@
-/*
- * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- *
- */
-
-#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP
-#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP
-
-#include "gc_implementation/g1/heapRegion.hpp"
-#include "gc_implementation/g1/heapRegionSeq.hpp"
-#include "gc_implementation/g1/heapRegionSet.inline.hpp"
-
-inline HeapRegion* HeapRegionSeq::addr_to_region(HeapWord* addr) const {
-  assert(addr < heap_end(),
-        err_msg("addr: "PTR_FORMAT" end: "PTR_FORMAT, p2i(addr), p2i(heap_end())));
-  assert(addr >= heap_bottom(),
-        err_msg("addr: "PTR_FORMAT" bottom: "PTR_FORMAT, p2i(addr), p2i(heap_bottom())));
-
-  HeapRegion* hr = _regions.get_by_address(addr);
-  return hr;
-}
-
-inline HeapRegion* HeapRegionSeq::at(uint index) const {
-  assert(is_available(index), "pre-condition");
-  HeapRegion* hr = _regions.get_by_index(index);
-  assert(hr != NULL, "sanity");
-  assert(hr->hrs_index() == index, "sanity");
-  return hr;
-}
-
-inline void HeapRegionSeq::insert_into_free_list(HeapRegion* hr) {
-  _free_list.add_ordered(hr);
-}
-
-inline void HeapRegionSeq::allocate_free_regions_starting_at(uint first, uint num_regions) {
-  _free_list.remove_starting_at(at(first), num_regions);
-}
-
-#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/heapRegionSet.cpp
--- a/src/share/vm/gc_implementation/g1/heapRegionSet.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/heapRegionSet.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -39,11 +39,11 @@
 
 #ifndef PRODUCT
 void HeapRegionSetBase::verify_region(HeapRegion* hr) {
-  assert(hr->containing_set() == this, err_msg("Inconsistent containing set for %u", hr->hrs_index()));
-  assert(!hr->is_young(), err_msg("Adding young region %u", hr->hrs_index())); // currently we don't use these sets for young regions
-  assert(hr->isHumongous() == regions_humongous(), err_msg("Wrong humongous state for region %u and set %s", hr->hrs_index(), name()));
-  assert(hr->is_empty() == regions_empty(), err_msg("Wrong empty state for region %u and set %s", hr->hrs_index(), name()));
-  assert(hr->rem_set()->verify_ready_for_par_iteration(), err_msg("Wrong iteration state %u", hr->hrs_index()));
+  assert(hr->containing_set() == this, err_msg("Inconsistent containing set for %u", hr->hrm_index()));
+  assert(!hr->is_young(), err_msg("Adding young region %u", hr->hrm_index())); // currently we don't use these sets for young regions
+  assert(hr->isHumongous() == regions_humongous(), err_msg("Wrong humongous state for region %u and set %s", hr->hrm_index(), name()));
+  assert(hr->is_empty() == regions_empty(), err_msg("Wrong empty state for region %u and set %s", hr->hrm_index(), name()));
+  assert(hr->rem_set()->verify_ready_for_par_iteration(), err_msg("Wrong iteration state %u", hr->hrm_index()));
 }
 #endif
 
@@ -158,7 +158,7 @@
     HeapRegion* curr_from = from_list->_head;
 
     while (curr_from != NULL) {
-      while (curr_to != NULL && curr_to->hrs_index() < curr_from->hrs_index()) {
+      while (curr_to != NULL && curr_to->hrm_index() < curr_from->hrm_index()) {
         curr_to = curr_to->next();
       }
 
@@ -183,7 +183,7 @@
       }
     }
 
-    if (_tail->hrs_index() < from_list->_tail->hrs_index()) {
+    if (_tail->hrm_index() < from_list->_tail->hrm_index()) {
       _tail = from_list->_tail;
     }
   }
@@ -309,8 +309,8 @@
     if (curr->next() != NULL) {
       guarantee(curr->next()->prev() == curr, "Next or prev pointers messed up");
     }
-    guarantee(curr->hrs_index() == 0 || curr->hrs_index() > last_index, "List should be sorted");
-    last_index = curr->hrs_index();
+    guarantee(curr->hrm_index() == 0 || curr->hrm_index() > last_index, "List should be sorted");
+    last_index = curr->hrm_index();
 
     capacity += curr->capacity();
 
@@ -319,7 +319,7 @@
     curr = curr->next();
   }
 
-  guarantee(_tail == prev0, err_msg("Expected %s to end with %u but it ended with %u.", name(), _tail->hrs_index(), prev0->hrs_index()));
+  guarantee(_tail == prev0, err_msg("Expected %s to end with %u but it ended with %u.", name(), _tail->hrm_index(), prev0->hrm_index()));
   guarantee(_tail == NULL || _tail->next() == NULL, "_tail should not have a next");
   guarantee(length() == count, err_msg("%s count mismatch. Expected %u, actual %u.", name(), length(), count));
   guarantee(total_capacity_bytes() == capacity, err_msg("%s capacity mismatch. Expected " SIZE_FORMAT ", actual " SIZE_FORMAT,
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/heapRegionSet.hpp
--- a/src/share/vm/gc_implementation/g1/heapRegionSet.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/heapRegionSet.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -238,14 +238,14 @@
 
   // Add hr to the list. The region should not be a member of another set.
   // Assumes that the list is ordered and will preserve that order. The order
-  // is determined by hrs_index.
+  // is determined by hrm_index.
   inline void add_ordered(HeapRegion* hr);
 
   // Removes from head or tail based on the given argument.
   HeapRegion* remove_region(bool from_head);
 
   // Merge two ordered lists. The result is also ordered. The order is
-  // determined by hrs_index.
+  // determined by hrm_index.
   void add_ordered(FreeRegionList* from_list);
 
   // It empties the list by removing all regions from it.
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/heapRegionSet.inline.hpp
--- a/src/share/vm/gc_implementation/g1/heapRegionSet.inline.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/heapRegionSet.inline.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -60,14 +60,14 @@
   if (_head != NULL) {
     HeapRegion* curr;
 
-    if (_last != NULL && _last->hrs_index() < hr->hrs_index()) {
+    if (_last != NULL && _last->hrm_index() < hr->hrm_index()) {
       curr = _last;
     } else {
       curr = _head;
     }
 
     // Find first entry with a Region Index larger than entry to insert.
-    while (curr != NULL && curr->hrs_index() < hr->hrs_index()) {
+    while (curr != NULL && curr->hrm_index() < hr->hrm_index()) {
       curr = curr->next();
     }
 
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/sparsePRT.cpp
--- a/src/share/vm/gc_implementation/g1/sparsePRT.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/sparsePRT.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -478,7 +478,7 @@
 bool SparsePRT::add_card(RegionIdx_t region_id, CardIdx_t card_index) {
 #if SPARSE_PRT_VERBOSE
   gclog_or_tty->print_cr("  Adding card %d from region %d to region %u sparse.",
-                         card_index, region_id, _hr->hrs_index());
+                         card_index, region_id, _hr->hrm_index());
 #endif
   if (_next->occupied_entries() * 2 > _next->capacity()) {
     expand();
@@ -530,7 +530,7 @@
 
 #if SPARSE_PRT_VERBOSE
   gclog_or_tty->print_cr("  Expanded sparse table for %u to %d.",
-                         _hr->hrs_index(), _next->capacity());
+                         _hr->hrm_index(), _next->capacity());
 #endif
   for (size_t i = 0; i < last->capacity(); i++) {
     SparsePRTEntry* e = last->entry((int)i);
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/gc_implementation/g1/vmStructs_g1.hpp
--- a/src/share/vm/gc_implementation/g1/vmStructs_g1.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/vmStructs_g1.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -26,7 +26,7 @@
 #define SHARE_VM_GC_IMPLEMENTATION_G1_VMSTRUCTS_G1_HPP
 
 #include "gc_implementation/g1/heapRegion.hpp"
-#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
+#include "gc_implementation/g1/heapRegionManager.inline.hpp"
 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
 
 #define VM_STRUCTS_G1(nonstatic_field, static_field)                          \
@@ -42,10 +42,10 @@
   nonstatic_field(G1HeapRegionTable, _bias,             size_t)               \
   nonstatic_field(G1HeapRegionTable, _shift_by,         uint)                 \
                                                                               \
-  nonstatic_field(HeapRegionSeq,   _regions,            G1HeapRegionTable)    \
-  nonstatic_field(HeapRegionSeq,   _num_committed,      uint)                 \
+  nonstatic_field(HeapRegionManager, _regions,          G1HeapRegionTable)    \
+  nonstatic_field(HeapRegionManager, _num_committed,    uint)                 \
                                                                               \
-  nonstatic_field(G1CollectedHeap, _hrs,                HeapRegionSeq)        \
+  nonstatic_field(G1CollectedHeap, _hrm,                HeapRegionManager)    \
   nonstatic_field(G1CollectedHeap, _summary_bytes_used, size_t)               \
   nonstatic_field(G1CollectedHeap, _g1mm,               G1MonitoringSupport*) \
   nonstatic_field(G1CollectedHeap, _old_set,            HeapRegionSetBase)    \
@@ -72,7 +72,7 @@
                                                                               \
   declare_type(G1OffsetTableContigSpace, CompactibleSpace)                    \
   declare_type(HeapRegion, G1OffsetTableContigSpace)                          \
-  declare_toplevel_type(HeapRegionSeq)                                        \
+  declare_toplevel_type(HeapRegionManager)                                        \
   declare_toplevel_type(HeapRegionSetBase)                                    \
   declare_toplevel_type(HeapRegionSetCount)                                   \
   declare_toplevel_type(G1MonitoringSupport)                                  \
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/memory/allocation.hpp
--- a/src/share/vm/memory/allocation.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/memory/allocation.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -265,7 +265,8 @@
   f(ConstantPool) \
   f(ConstantPoolCache) \
   f(Annotation) \
-  f(MethodCounters)
+  f(MethodCounters) \
+  f(Deallocated)
 
 #define METASPACE_OBJ_TYPE_DECLARE(name) name ## Type,
 #define METASPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name;
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/memory/filemap.cpp
--- a/src/share/vm/memory/filemap.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/memory/filemap.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -24,9 +24,14 @@
 
 #include "precompiled.hpp"
 #include "classfile/classLoader.hpp"
+#include "classfile/sharedClassUtil.hpp"
 #include "classfile/symbolTable.hpp"
+#include "classfile/systemDictionaryShared.hpp"
 #include "classfile/altHashing.hpp"
 #include "memory/filemap.hpp"
+#include "memory/metadataFactory.hpp"
+#include "memory/oopFactory.hpp"
+#include "oops/objArrayOop.hpp"
 #include "runtime/arguments.hpp"
 #include "runtime/java.hpp"
 #include "runtime/os.hpp"
@@ -41,7 +46,6 @@
 #endif
 
 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
-
 extern address JVM_FunctionAtStart();
 extern address JVM_FunctionAtEnd();
 
@@ -77,12 +81,27 @@
 void FileMapInfo::fail_continue(const char *msg, ...) {
   va_list ap;
   va_start(ap, msg);
-  if (RequireSharedSpaces) {
-    fail(msg, ap);
+  MetaspaceShared::set_archive_loading_failed();
+  if (PrintSharedArchiveAndExit && _validating_classpath_entry_table) {
+    // If we are doing PrintSharedArchiveAndExit and some of the classpath entries
+    // do not validate, we can still continue "limping" to validate the remaining
+    // entries. No need to quit.
+    tty->print("[");
+    tty->vprint(msg, ap);
+    tty->print_cr("]");
+  } else {
+    if (RequireSharedSpaces) {
+      fail(msg, ap);
+    } else {
+      if (PrintSharedSpaces) {
+        tty->print_cr("UseSharedSpaces: %s", msg);
+      }
+    }
   }
   va_end(ap);
   UseSharedSpaces = false;
-  close();
+  assert(current_info() != NULL, "singleton must be registered");
+  current_info()->close();
 }
 
 // Fill in the fileMapInfo structure with data about this VM instance.
@@ -117,67 +136,201 @@
   }
 }
 
+FileMapInfo::FileMapInfo() {
+  assert(_current_info == NULL, "must be singleton"); // not thread safe
+  _current_info = this;
+  memset(this, 0, sizeof(FileMapInfo));
+  _file_offset = 0;
+  _file_open = false;
+  _header = SharedClassUtil::allocate_file_map_header();
+  _header->_version = _invalid_version;
+}
+
+FileMapInfo::~FileMapInfo() {
+  assert(_current_info == this, "must be singleton"); // not thread safe
+  _current_info = NULL;
+}
+
 void FileMapInfo::populate_header(size_t alignment) {
-  _header._magic = 0xf00baba2;
-  _header._version = _current_version;
-  _header._alignment = alignment;
-  _header._obj_alignment = ObjectAlignmentInBytes;
+  _header->populate(this, alignment);
+}
+
+size_t FileMapInfo::FileMapHeader::data_size() {
+  return SharedClassUtil::file_map_header_size() - sizeof(FileMapInfo::FileMapHeaderBase);
+}
+
+void FileMapInfo::FileMapHeader::populate(FileMapInfo* mapinfo, size_t alignment) {
+  _magic = 0xf00baba2;
+  _version = _current_version;
+  _alignment = alignment;
+  _obj_alignment = ObjectAlignmentInBytes;
+  _classpath_entry_table_size = mapinfo->_classpath_entry_table_size;
+  _classpath_entry_table = mapinfo->_classpath_entry_table;
+  _classpath_entry_size = mapinfo->_classpath_entry_size;
 
   // The following fields are for sanity checks for whether this archive
   // will function correctly with this JVM and the bootclasspath it's
   // invoked with.
 
   // JVM version string ... changes on each build.
-  get_header_version(_header._jvm_ident);
+  get_header_version(_jvm_ident);
+}
+
+void FileMapInfo::allocate_classpath_entry_table() {
+  int bytes = 0;
+  int count = 0;
+  char* strptr = NULL;
+  char* strptr_max = NULL;
+  Thread* THREAD = Thread::current();
 
-  // Build checks on classpath and jar files
-  _header._num_jars = 0;
-  ClassPathEntry *cpe = ClassLoader::classpath_entry(0);
-  for ( ; cpe != NULL; cpe = cpe->next()) {
+  ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
+  size_t entry_size = SharedClassUtil::shared_class_path_entry_size();
 
-    if (cpe->is_jar_file()) {
-      if (_header._num_jars >= JVM_SHARED_JARS_MAX) {
-        fail_stop("Too many jar files to share.", NULL);
-      }
+  for (int pass=0; pass<2; pass++) {
+    ClassPathEntry *cpe = ClassLoader::classpath_entry(0);
+
+    for (int cur_entry = 0 ; cpe != NULL; cpe = cpe->next(), cur_entry++) {
+      const char *name = cpe->name();
+      int name_bytes = (int)(strlen(name) + 1);
 
-      // Jar file - record timestamp and file size.
-      struct stat st;
-      const char *path = cpe->name();
-      if (os::stat(path, &st) != 0) {
-        // If we can't access a jar file in the boot path, then we can't
-        // make assumptions about where classes get loaded from.
-        fail_stop("Unable to open jar file %s.", path);
-      }
-      _header._jar[_header._num_jars]._timestamp = st.st_mtime;
-      _header._jar[_header._num_jars]._filesize = st.st_size;
-      _header._num_jars++;
-    } else {
+      if (pass == 0) {
+        count ++;
+        bytes += (int)entry_size;
+        bytes += name_bytes;
+        if (TraceClassPaths || (TraceClassLoading && Verbose)) {
+          tty->print_cr("[Add main shared path (%s) %s]", (cpe->is_jar_file() ? "jar" : "dir"), name);
+        }
+      } else {
+        SharedClassPathEntry* ent = shared_classpath(cur_entry);
+        if (cpe->is_jar_file()) {
+          struct stat st;
+          if (os::stat(name, &st) != 0) {
+            // The file/dir must exist, or it would not have been added
+            // into ClassLoader::classpath_entry().
+            //
+            // If we can't access a jar file in the boot path, then we can't
+            // make assumptions about where classes get loaded from.
+            FileMapInfo::fail_stop("Unable to open jar file %s.", name);
+          }
 
-      // If directories appear in boot classpath, they must be empty to
-      // avoid having to verify each individual class file.
-      const char* name = ((ClassPathDirEntry*)cpe)->name();
-      if (!os::dir_is_empty(name)) {
-        fail_stop("Boot classpath directory %s is not empty.", name);
+          EXCEPTION_MARK; // The following call should never throw, but would exit VM on error.
+          SharedClassUtil::update_shared_classpath(cpe, ent, st.st_mtime, st.st_size, THREAD);
+        } else {
+          ent->_filesize  = -1;
+          if (!os::dir_is_empty(name)) {
+            ClassLoader::exit_with_path_failure("Cannot have non-empty directory in archived classpaths", name);
+          }
+        }
+        ent->_name = strptr;
+        if (strptr + name_bytes <= strptr_max) {
+          strncpy(strptr, name, (size_t)name_bytes); // name_bytes includes trailing 0.
+          strptr += name_bytes;
+        } else {
+          assert(0, "miscalculated buffer size");
+        }
       }
     }
+
+    if (pass == 0) {
+      EXCEPTION_MARK; // The following call should never throw, but would exit VM on error.
+      Array<u8>* arr = MetadataFactory::new_array<u8>(loader_data, (bytes + 7)/8, THREAD);
+      strptr = (char*)(arr->data());
+      strptr_max = strptr + bytes;
+      SharedClassPathEntry* table = (SharedClassPathEntry*)strptr;
+      strptr += entry_size * count;
+
+      _classpath_entry_table_size = count;
+      _classpath_entry_table = table;
+      _classpath_entry_size = entry_size;
+    }
   }
 }
 
+bool FileMapInfo::validate_classpath_entry_table() {
+  _validating_classpath_entry_table = true;
+
+  int count = _header->_classpath_entry_table_size;
+
+  _classpath_entry_table = _header->_classpath_entry_table;
+  _classpath_entry_size = _header->_classpath_entry_size;
+
+  for (int i=0; i<count; i++) {
+    SharedClassPathEntry* ent = shared_classpath(i);
+    struct stat st;
+    const char* name = ent->_name;
+    bool ok = true;
+    if (TraceClassPaths || (TraceClassLoading && Verbose)) {
+      tty->print_cr("[Checking shared classpath entry: %s]", name);
+    }
+    if (os::stat(name, &st) != 0) {
+      fail_continue("Required classpath entry does not exist: %s", name);
+      ok = false;
+    } else if (ent->is_dir()) {
+      if (!os::dir_is_empty(name)) {
+        fail_continue("directory is not empty: %s", name);
+        ok = false;
+      }
+    } else {
+      if (ent->_timestamp != st.st_mtime ||
+          ent->_filesize != st.st_size) {
+        ok = false;
+        if (PrintSharedArchiveAndExit) {
+          fail_continue(ent->_timestamp != st.st_mtime ?
+                        "Timestamp mismatch" :
+                        "File size mismatch");
+        } else {
+          fail_continue("A jar file is not the one used while building"
+                        " the shared archive file: %s", name);
+        }
+      }
+    }
+    if (ok) {
+      if (TraceClassPaths || (TraceClassLoading && Verbose)) {
+        tty->print_cr("[ok]");
+      }
+    } else if (!PrintSharedArchiveAndExit) {
+      _validating_classpath_entry_table = false;
+      return false;
+    }
+  }
+
+  _classpath_entry_table_size = _header->_classpath_entry_table_size;
+  _validating_classpath_entry_table = false;
+  return true;
+}
+
 
 // Read the FileMapInfo information from the file.
 
 bool FileMapInfo::init_from_file(int fd) {
-
-  size_t n = read(fd, &_header, sizeof(struct FileMapHeader));
-  if (n != sizeof(struct FileMapHeader)) {
+  size_t sz = _header->data_size();
+  char* addr = _header->data();
+  size_t n = os::read(fd, addr, (unsigned int)sz);
+  if (n != sz) {
     fail_continue("Unable to read the file header.");
     return false;
   }
-  if (_header._version != current_version()) {
+  if (_header->_version != current_version()) {
     fail_continue("The shared archive file has the wrong version.");
     return false;
   }
   _file_offset = (long)n;
+
+  size_t info_size = _header->_paths_misc_info_size;
+  _paths_misc_info = NEW_C_HEAP_ARRAY_RETURN_NULL(char, info_size, mtClass);
+  if (_paths_misc_info == NULL) {
+    fail_continue("Unable to read the file header.");
+    return false;
+  }
+  n = os::read(fd, _paths_misc_info, (unsigned int)info_size);
+  if (n != info_size) {
+    fail_continue("Unable to read the shared path info header.");
+    FREE_C_HEAP_ARRAY(char, _paths_misc_info, mtClass);
+    _paths_misc_info = NULL;
+    return false;
+  }
+
+  _file_offset += (long)n;
   return true;
 }
 
@@ -232,7 +385,16 @@
 // Write the header to the file, seek to the next allocation boundary.
 
 void FileMapInfo::write_header() {
-  write_bytes_aligned(&_header, sizeof(FileMapHeader));
+  int info_size = ClassLoader::get_shared_paths_misc_info_size();
+
+  _header->_paths_misc_info_size = info_size;
+
+  align_file_position();
+  size_t sz = _header->data_size();
+  char* addr = _header->data();
+  write_bytes(addr, (int)sz); // skip the C++ vtable
+  write_bytes(ClassLoader::get_shared_paths_misc_info(), info_size);
+  align_file_position();
 }
 
 
@@ -242,7 +404,7 @@
   align_file_position();
   size_t used = space->used_bytes_slow(Metaspace::NonClassType);
   size_t capacity = space->capacity_bytes_slow(Metaspace::NonClassType);
-  struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i];
+  struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i];
   write_region(i, (char*)space->bottom(), used, capacity, read_only, false);
 }
 
@@ -252,7 +414,7 @@
 void FileMapInfo::write_region(int region, char* base, size_t size,
                                size_t capacity, bool read_only,
                                bool allow_exec) {
-  struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[region];
+  struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[region];
 
   if (_file_open) {
     guarantee(si->_file_offset == _file_offset, "file offset mismatch.");
@@ -334,7 +496,7 @@
 // JVM/TI RedefineClasses() support:
 // Remap the shared readonly space to shared readwrite, private.
 bool FileMapInfo::remap_shared_readonly_as_readwrite() {
-  struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0];
+  struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[0];
   if (!si->_read_only) {
     // the space is already readwrite so we are done
     return true;
@@ -362,7 +524,7 @@
 
 // Map the whole region at once, assumed to be allocated contiguously.
 ReservedSpace FileMapInfo::reserve_shared_memory() {
-  struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0];
+  struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[0];
   char* requested_addr = si->_base;
 
   size_t size = FileMapInfo::shared_spaces_size();
@@ -384,7 +546,7 @@
 static const char* shared_region_name[] = { "ReadOnly", "ReadWrite", "MiscData", "MiscCode"};
 
 char* FileMapInfo::map_region(int i) {
-  struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i];
+  struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i];
   size_t used = si->_used;
   size_t alignment = os::vm_allocation_granularity();
   size_t size = align_size_up(used, alignment);
@@ -410,7 +572,7 @@
 // Unmap a memory region in the address space.
 
 void FileMapInfo::unmap_region(int i) {
-  struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i];
+  struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i];
   size_t used = si->_used;
   size_t size = align_size_up(used, os::vm_allocation_granularity());
   if (!os::unmap_memory(si->_base, size)) {
@@ -427,12 +589,21 @@
 
 
 FileMapInfo* FileMapInfo::_current_info = NULL;
-
+SharedClassPathEntry* FileMapInfo::_classpath_entry_table = NULL;
+int FileMapInfo::_classpath_entry_table_size = 0;
+size_t FileMapInfo::_classpath_entry_size = 0x1234baad;
+bool FileMapInfo::_validating_classpath_entry_table = false;
 
 // Open the shared archive file, read and validate the header
 // information (version, boot classpath, etc.).  If initialization
 // fails, shared spaces are disabled and the file is closed. [See
 // fail_continue.]
+//
+// Validation of the archive is done in two steps:
+//
+// [1] validate_header() - done here. This checks the header, including _paths_misc_info.
+// [2] validate_classpath_entry_table - this is done later, because the table is in the RW
+//     region of the archive, which is not mapped yet.
 bool FileMapInfo::initialize() {
   assert(UseSharedSpaces, "UseSharedSpaces expected.");
 
@@ -446,92 +617,66 @@
   }
 
   init_from_file(_fd);
-  if (!validate()) {
+  if (!validate_header()) {
     return false;
   }
 
-  SharedReadOnlySize =  _header._space[0]._capacity;
-  SharedReadWriteSize = _header._space[1]._capacity;
-  SharedMiscDataSize =  _header._space[2]._capacity;
-  SharedMiscCodeSize =  _header._space[3]._capacity;
+  SharedReadOnlySize =  _header->_space[0]._capacity;
+  SharedReadWriteSize = _header->_space[1]._capacity;
+  SharedMiscDataSize =  _header->_space[2]._capacity;
+  SharedMiscCodeSize =  _header->_space[3]._capacity;
   return true;
 }
 
-
-bool FileMapInfo::validate() {
-  if (_header._version != current_version()) {
-    fail_continue("The shared archive file is the wrong version.");
+bool FileMapInfo::FileMapHeader::validate() {
+  if (_version != current_version()) {
+    FileMapInfo::fail_continue("The shared archive file is the wrong version.");
     return false;
   }
-  if (_header._magic != (int)0xf00baba2) {
-    fail_continue("The shared archive file has a bad magic number.");
+  if (_magic != (int)0xf00baba2) {
+    FileMapInfo::fail_continue("The shared archive file has a bad magic number.");
     return false;
   }
   char header_version[JVM_IDENT_MAX];
   get_header_version(header_version);
-  if (strncmp(_header._jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) {
-    fail_continue("The shared archive file was created by a different"
-                  " version or build of HotSpot.");
-    return false;
-  }
-  if (_header._obj_alignment != ObjectAlignmentInBytes) {
-    fail_continue("The shared archive file's ObjectAlignmentInBytes of %d"
-                  " does not equal the current ObjectAlignmentInBytes of %d.",
-                  _header._obj_alignment, ObjectAlignmentInBytes);
-    return false;
-  }
-
-  // Cannot verify interpreter yet, as it can only be created after the GC
-  // heap has been initialized.
-
-  if (_header._num_jars >= JVM_SHARED_JARS_MAX) {
-    fail_continue("Too many jar files to share.");
+  if (strncmp(_jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) {
+    if (TraceClassPaths) {
+      tty->print_cr("Expected: %s", header_version);
+      tty->print_cr("Actual:   %s", _jvm_ident);
+    }
+    FileMapInfo::fail_continue("The shared archive file was created by a different"
+                  " version or build of HotSpot");
     return false;
   }
-
-  // Build checks on classpath and jar files
-  int num_jars_now = 0;
-  ClassPathEntry *cpe = ClassLoader::classpath_entry(0);
-  for ( ; cpe != NULL; cpe = cpe->next()) {
-
-    if (cpe->is_jar_file()) {
-      if (num_jars_now < _header._num_jars) {
-
-        // Jar file - verify timestamp and file size.
-        struct stat st;
-        const char *path = cpe->name();
-        if (os::stat(path, &st) != 0) {
-          fail_continue("Unable to open jar file %s.", path);
-          return false;
-        }
-        if (_header._jar[num_jars_now]._timestamp != st.st_mtime ||
-            _header._jar[num_jars_now]._filesize != st.st_size) {
-          fail_continue("A jar file is not the one used while building"
-                        " the shared archive file.");
-          return false;
-        }
-      }
-      ++num_jars_now;
-    } else {
-
-      // If directories appear in boot classpath, they must be empty to
-      // avoid having to verify each individual class file.
-      const char* name = ((ClassPathDirEntry*)cpe)->name();
-      if (!os::dir_is_empty(name)) {
-        fail_continue("Boot classpath directory %s is not empty.", name);
-        return false;
-      }
-    }
-  }
-  if (num_jars_now < _header._num_jars) {
-    fail_continue("The number of jar files in the boot classpath is"
-                  " less than the number the shared archive was created with.");
+  if (_obj_alignment != ObjectAlignmentInBytes) {
+    FileMapInfo::fail_continue("The shared archive file's ObjectAlignmentInBytes of %d"
+                  " does not equal the current ObjectAlignmentInBytes of %d.",
+                  _obj_alignment, ObjectAlignmentInBytes);
     return false;
   }
 
   return true;
 }
 
+bool FileMapInfo::validate_header() {
+  bool status = _header->validate();
+
+  if (status) {
+    if (!ClassLoader::check_shared_paths_misc_info(_paths_misc_info, _header->_paths_misc_info_size)) {
+      if (!PrintSharedArchiveAndExit) {
+        fail_continue("shared class paths mismatch (hint: enable -XX:+TraceClassPaths to diagnose the failure)");
+        status = false;
+      }
+    }
+  }
+
+  if (_paths_misc_info != NULL) {
+    FREE_C_HEAP_ARRAY(char, _paths_misc_info, mtClass);
+    _paths_misc_info = NULL;
+  }
+  return status;
+}
+
 // The following method is provided to see whether a given pointer
 // falls in the mapped shared space.
 // Param:
@@ -540,8 +685,8 @@
 // True if the p is within the mapped shared space, otherwise, false.
 bool FileMapInfo::is_in_shared_space(const void* p) {
   for (int i = 0; i < MetaspaceShared::n_regions; i++) {
-    if (p >= _header._space[i]._base &&
-        p < _header._space[i]._base + _header._space[i]._used) {
+    if (p >= _header->_space[i]._base &&
+        p < _header->_space[i]._base + _header->_space[i]._used) {
       return true;
     }
   }
@@ -552,7 +697,7 @@
 void FileMapInfo::print_shared_spaces() {
   gclog_or_tty->print_cr("Shared Spaces:");
   for (int i = 0; i < MetaspaceShared::n_regions; i++) {
-    struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i];
+    struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i];
     gclog_or_tty->print("  %s " INTPTR_FORMAT "-" INTPTR_FORMAT,
                         shared_region_name[i],
                         si->_base, si->_base + si->_used);
@@ -565,9 +710,9 @@
   if (map_info) {
     map_info->fail_continue(msg);
     for (int i = 0; i < MetaspaceShared::n_regions; i++) {
-      if (map_info->_header._space[i]._base != NULL) {
+      if (map_info->_header->_space[i]._base != NULL) {
         map_info->unmap_region(i);
-        map_info->_header._space[i]._base = NULL;
+        map_info->_header->_space[i]._base = NULL;
       }
     }
   } else if (DumpSharedSpaces) {
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/memory/filemap.hpp
--- a/src/share/vm/memory/filemap.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/memory/filemap.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -37,30 +37,55 @@
 //  misc data (block offset table, string table, symbols, dictionary, etc.)
 //  tag(666)
 
-static const int JVM_SHARED_JARS_MAX = 128;
-static const int JVM_SPACENAME_MAX = 128;
 static const int JVM_IDENT_MAX = 256;
-static const int JVM_ARCH_MAX = 12;
-
 
 class Metaspace;
 
+class SharedClassPathEntry VALUE_OBJ_CLASS_SPEC {
+public:
+  const char *_name;
+  time_t _timestamp;          // jar timestamp,  0 if is directory
+  long   _filesize;           // jar file size, -1 if is directory
+  bool is_dir() {
+    return _filesize == -1;
+  }
+};
+
 class FileMapInfo : public CHeapObj<mtInternal> {
 private:
+  friend class ManifestStream;
   enum {
     _invalid_version = -1,
-    _current_version = 1
+    _current_version = 2
   };
 
   bool  _file_open;
   int   _fd;
   long  _file_offset;
 
+private:
+  static SharedClassPathEntry* _classpath_entry_table;
+  static int                   _classpath_entry_table_size;
+  static size_t                _classpath_entry_size;
+  static bool                  _validating_classpath_entry_table;
+
   // FileMapHeader describes the shared space data in the file to be
   // mapped.  This structure gets written to a file.  It is not a class, so
   // that the compilers don't add any compiler-private data to it.
 
-  struct FileMapHeader {
+public:
+  struct FileMapHeaderBase : public CHeapObj<mtClass> {
+    virtual bool validate() = 0;
+    virtual void populate(FileMapInfo* info, size_t alignment) = 0;
+  };
+  struct FileMapHeader : FileMapHeaderBase {
+    // Use data() and data_size() to memcopy to/from the FileMapHeader. We need to
+    // avoid read/writing the C++ vtable pointer.
+    static size_t data_size();
+    char* data() {
+      return ((char*)this) + sizeof(FileMapHeaderBase);
+    }
+
     int    _magic;                    // identify file type.
     int    _version;                  // (from enum, above.)
     size_t _alignment;                // how shared archive should be aligned
@@ -78,44 +103,64 @@
     // The following fields are all sanity checks for whether this archive
     // will function correctly with this JVM and the bootclasspath it's
     // invoked with.
-    char  _arch[JVM_ARCH_MAX];            // architecture
     char  _jvm_ident[JVM_IDENT_MAX];      // identifier for jvm
-    int   _num_jars;              // Number of jars in bootclasspath
 
-    // Per jar file data:  timestamp, size.
+    // The _paths_misc_info is a variable-size structure that records "miscellaneous"
+    // information during dumping. It is generated and validated by the
+    // SharedPathsMiscInfo class. See SharedPathsMiscInfo.hpp and sharedClassUtil.hpp for
+    // detailed description.
+    //
+    // The _paths_misc_info data is stored as a byte array in the archive file header,
+    // immediately after the _header field. This information is used only when
+    // checking the validity of the archive and is deallocated after the archive is loaded.
+    //
+    // Note that the _paths_misc_info does NOT include information for JAR files
+    // that existed during dump time. Their information is stored in _classpath_entry_table.
+    int _paths_misc_info_size;
 
-    struct {
-      time_t _timestamp;          // jar timestamp.
-      long   _filesize;           // jar file size.
-    } _jar[JVM_SHARED_JARS_MAX];
-  } _header;
+    // The following is a table of all the class path entries that were used
+    // during dumping. At run time, we require these files to exist and have the same
+    // size/modification time, or else the archive will refuse to load.
+    //
+    // All of these entries must be JAR files. The dumping process would fail if a non-empty
+    // directory was specified in the classpaths. If an empty directory was specified
+    // it is checked by the _paths_misc_info as described above.
+    //
+    // FIXME -- if JAR files in the tail of the list were specified but not used during dumping,
+    // they should be removed from this table, to save space and to avoid spurious
+    // loading failures during runtime.
+    int _classpath_entry_table_size;
+    size_t _classpath_entry_size;
+    SharedClassPathEntry* _classpath_entry_table;
+
+    virtual bool validate();
+    virtual void populate(FileMapInfo* info, size_t alignment);
+  };
+
+  FileMapHeader * _header;
+
   const char* _full_path;
+  char* _paths_misc_info;
 
   static FileMapInfo* _current_info;
 
   bool  init_from_file(int fd);
   void  align_file_position();
+  bool  validate_header_impl();
 
 public:
-  FileMapInfo() {
-    _file_offset = 0;
-    _file_open = false;
-    _header._version = _invalid_version;
-  }
+  FileMapInfo();
+  ~FileMapInfo();
 
   static int current_version()        { return _current_version; }
   void   populate_header(size_t alignment);
-  bool   validate();
+  bool   validate_header();
   void   invalidate();
-  int    version()                    { return _header._version; }
-  size_t alignment()                  { return _header._alignment; }
-  size_t space_capacity(int i)        { return _header._space[i]._capacity; }
-  char*  region_base(int i)           { return _header._space[i]._base; }
-  struct FileMapHeader* header()      { return &_header; }
-
-  static void set_current_info(FileMapInfo* info) {
-    CDS_ONLY(_current_info = info;)
-  }
+  int    version()                    { return _header->_version; }
+  size_t alignment()                  { return _header->_alignment; }
+  size_t space_capacity(int i)        { return _header->_space[i]._capacity; }
+  char*  region_base(int i)           { return _header->_space[i]._base; }
+  struct FileMapHeader* header()      { return _header; }
 
   static FileMapInfo* current_info() {
     CDS_ONLY(return _current_info;)
@@ -146,7 +191,7 @@
 
   // Errors.
   static void fail_stop(const char *msg, ...);
-  void fail_continue(const char *msg, ...);
+  static void fail_continue(const char *msg, ...);
 
   // Return true if given address is in the mapped shared space.
   bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false);
@@ -160,6 +205,22 @@
 
   // Stop CDS sharing and unmap CDS regions.
   static void stop_sharing_and_unmap(const char* msg);
+
+  static void allocate_classpath_entry_table();
+  bool validate_classpath_entry_table();
+
+  static SharedClassPathEntry* shared_classpath(int index) {
+    char* p = (char*)_classpath_entry_table;
+    p += _classpath_entry_size * index;
+    return (SharedClassPathEntry*)p;
+  }
+  static const char* shared_classpath_name(int index) {
+    return shared_classpath(index)->_name;
+  }
+
+  static int get_number_of_share_classpaths() {
+    return _classpath_entry_table_size;
+  }
 };
 
 #endif // SHARE_VM_MEMORY_FILEMAP_HPP
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/memory/metadataFactory.hpp
--- a/src/share/vm/memory/metadataFactory.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/memory/metadataFactory.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -79,6 +79,12 @@
   // Deallocation method for metadata
   template <class T>
   static void free_metadata(ClassLoaderData* loader_data, T md) {
+    if (DumpSharedSpaces) {
+      // FIXME: the freeing code is buggy, especially when PrintSharedSpaces is enabled.
+      // Disable for now -- this means if you specify bad classes in your classlist you
+      // may have wasted space inside the archive.
+      return;
+    }
     if (md != NULL) {
       assert(loader_data != NULL, "shouldn't pass null");
       int size = md->size();
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/memory/metaspace.cpp
--- a/src/share/vm/memory/metaspace.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/memory/metaspace.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -413,6 +413,7 @@
 VirtualSpaceNode::VirtualSpaceNode(size_t bytes) : _top(NULL), _next(NULL), _rs(), _container_count(0) {
   assert_is_size_aligned(bytes, Metaspace::reserve_alignment());
 
+#if INCLUDE_CDS
   // This allocates memory with mmap.  For DumpSharedspaces, try to reserve
   // configurable address, generally at the top of the Java heap so other
   // memory addresses don't conflict.
@@ -428,7 +429,9 @@
       _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages);
     }
     MetaspaceShared::set_shared_rs(&_rs);
-  } else {
+  } else
+#endif
+  {
     bool large_pages = should_commit_large_pages_when_reserving(bytes);
 
     _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages);
@@ -2937,11 +2940,14 @@
   // between the lower base and higher address.
   address lower_base;
   address higher_address;
+#if INCLUDE_CDS
   if (UseSharedSpaces) {
     higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()),
                           (address)(metaspace_base + compressed_class_space_size()));
     lower_base = MIN2(metaspace_base, cds_base);
-  } else {
+  } else
+#endif
+  {
     higher_address = metaspace_base + compressed_class_space_size();
     lower_base = metaspace_base;
 
@@ -2962,6 +2968,7 @@
   }
 }
 
+#if INCLUDE_CDS
 // Return TRUE if the specified metaspace_base and cds_base are close enough
 // to work with compressed klass pointers.
 bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base) {
@@ -2972,6 +2979,7 @@
                                 (address)(metaspace_base + compressed_class_space_size()));
   return ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax);
 }
+#endif
 
 // Try to allocate the metaspace at the requested addr.
 void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) {
@@ -2991,6 +2999,7 @@
                                              large_pages,
                                              requested_addr, 0);
   if (!metaspace_rs.is_reserved()) {
+#if INCLUDE_CDS
     if (UseSharedSpaces) {
       size_t increment = align_size_up(1*G, _reserve_alignment);
 
@@ -3005,7 +3014,7 @@
                                      _reserve_alignment, large_pages, addr, 0);
       }
     }
-
+#endif
     // If no successful allocation then try to allocate the space anywhere.  If
     // that fails then OOM doom.  At this point we cannot try allocating the
     // metaspace as if UseCompressedClassPointers is off because too much
@@ -3024,12 +3033,13 @@
   // If we got here then the metaspace got allocated.
   MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass);
 
+#if INCLUDE_CDS
   // Verify that we can use shared spaces.  Otherwise, turn off CDS.
   if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(metaspace_rs.base(), cds_base)) {
     FileMapInfo::stop_sharing_and_unmap(
         "Could not allocate metaspace at a compatible address");
   }
-
+#endif
   set_narrow_klass_base_and_shift((address)metaspace_rs.base(),
                                   UseSharedSpaces ? (address)cds_base : 0);
 
@@ -3113,6 +3123,7 @@
   MetaspaceShared::set_max_alignment(max_alignment);
 
   if (DumpSharedSpaces) {
+#if INCLUDE_CDS
     SharedReadOnlySize  = align_size_up(SharedReadOnlySize,  max_alignment);
     SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment);
     SharedMiscDataSize  = align_size_up(SharedMiscDataSize,  max_alignment);
@@ -3150,23 +3161,22 @@
     }
 
     Universe::set_narrow_klass_shift(0);
-#endif
-
+#endif // _LP64
+#endif // INCLUDE_CDS
   } else {
+#if INCLUDE_CDS
     // If using shared space, open the file that contains the shared space
     // and map in the memory before initializing the rest of metaspace (so
     // the addresses don't conflict)
     address cds_address = NULL;
     if (UseSharedSpaces) {
       FileMapInfo* mapinfo = new FileMapInfo();
-      memset(mapinfo, 0, sizeof(FileMapInfo));
 
       // Open the shared archive file, read and validate the header. If
       // initialization fails, shared spaces [UseSharedSpaces] are
       // disabled and the file is closed.
       // Map in spaces now also
       if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) {
-        FileMapInfo::set_current_info(mapinfo);
         cds_total = FileMapInfo::shared_spaces_size();
         cds_address = (address)mapinfo->region_base(0);
       } else {
@@ -3174,21 +3184,23 @@
                "archive file not closed or shared spaces not disabled.");
       }
     }
-
+#endif // INCLUDE_CDS
 #ifdef _LP64
     // If UseCompressedClassPointers is set then allocate the metaspace area
     // above the heap and above the CDS area (if it exists).
     if (using_class_space()) {
       if (UseSharedSpaces) {
+#if INCLUDE_CDS
         char* cds_end = (char*)(cds_address + cds_total);
         cds_end = (char *)align_ptr_up(cds_end, _reserve_alignment);
         allocate_metaspace_compressed_klass_ptrs(cds_end, cds_address);
+#endif
       } else {
         char* base = (char*)align_ptr_up(Universe::heap()->reserved_region().end(), _reserve_alignment);
         allocate_metaspace_compressed_klass_ptrs(base, 0);
       }
     }
-#endif
+#endif // _LP64
 
     // Initialize these before initializing the VirtualSpaceList
     _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
@@ -3366,6 +3378,10 @@
 
 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
   if (SafepointSynchronize::is_at_safepoint()) {
+    if (DumpSharedSpaces && PrintSharedSpaces) {
+      record_deallocation(ptr, vsm()->get_raw_word_size(word_size));
+    }
+
     assert(Thread::current()->is_VM_thread(), "should be the VM thread");
     // Don't take Heap_lock
     MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
@@ -3420,8 +3436,9 @@
     if (result == NULL) {
       report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite);
     }
-
-    space->record_allocation(result, type, space->vsm()->get_raw_word_size(word_size));
+    if (PrintSharedSpaces) {
+      space->record_allocation(result, type, space->vsm()->get_raw_word_size(word_size));
+    }
 
     // Zero initialize.
     Copy::fill_to_aligned_words((HeapWord*)result, word_size, 0);
@@ -3520,15 +3537,55 @@
 void Metaspace::record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size) {
   assert(DumpSharedSpaces, "sanity");
 
-  AllocRecord *rec = new AllocRecord((address)ptr, type, (int)word_size * HeapWordSize);
+  int byte_size = (int)word_size * HeapWordSize;
+  AllocRecord *rec = new AllocRecord((address)ptr, type, byte_size);
+
   if (_alloc_record_head == NULL) {
     _alloc_record_head = _alloc_record_tail = rec;
-  } else {
+  } else if (_alloc_record_tail->_ptr + _alloc_record_tail->_byte_size == (address)ptr) {
     _alloc_record_tail->_next = rec;
     _alloc_record_tail = rec;
+  } else {
+    // slow linear search, but this doesn't happen that often, and only when dumping
+    for (AllocRecord *old = _alloc_record_head; old; old = old->_next) {
+      if (old->_ptr == ptr) {
+        assert(old->_type == MetaspaceObj::DeallocatedType, "sanity");
+        int remain_bytes = old->_byte_size - byte_size;
+        assert(remain_bytes >= 0, "sanity");
+        old->_type = type;
+
+        if (remain_bytes == 0) {
+          delete(rec);
+        } else {
+          address remain_ptr = address(ptr) + byte_size;
+          rec->_ptr = remain_ptr;
+          rec->_byte_size = remain_bytes;
+          rec->_type = MetaspaceObj::DeallocatedType;
+          rec->_next = old->_next;
+          old->_byte_size = byte_size;
+          old->_next = rec;
+        }
+        return;
+      }
+    }
+    assert(0, "reallocating a freed pointer that was not recorded");
   }
 }
 
+void Metaspace::record_deallocation(void* ptr, size_t word_size) {
+  assert(DumpSharedSpaces, "sanity");
+
+  for (AllocRecord *rec = _alloc_record_head; rec; rec = rec->_next) {
+    if (rec->_ptr == ptr) {
+      assert(rec->_byte_size == (int)word_size * HeapWordSize, "sanity");
+      rec->_type = MetaspaceObj::DeallocatedType;
+      return;
+    }
+  }
+
+  assert(0, "deallocating a pointer that was not recorded");
+}
+
 void Metaspace::iterate(Metaspace::AllocRecordClosure *closure) {
   assert(DumpSharedSpaces, "unimplemented for !DumpSharedSpaces");
 
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/memory/metaspace.hpp
--- a/src/share/vm/memory/metaspace.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/memory/metaspace.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -171,9 +171,10 @@
   static const MetaspaceTracer* tracer() { return _tracer; }
 
  private:
-  // This is used by DumpSharedSpaces only, where only _vsm is used. So we will
+  // These 2 methods are used by DumpSharedSpaces only, where only _vsm is used. So we will
   // maintain a single list for now.
   void record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size);
+  void record_deallocation(void* ptr, size_t word_size);
 
 #ifdef _LP64
   static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base);
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/memory/metaspaceShared.cpp
--- a/src/share/vm/memory/metaspaceShared.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/memory/metaspaceShared.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -26,6 +26,7 @@
 #include "classfile/dictionary.hpp"
 #include "classfile/loaderConstraints.hpp"
 #include "classfile/placeholders.hpp"
+#include "classfile/sharedClassUtil.hpp"
 #include "classfile/symbolTable.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "code/codeCache.hpp"
@@ -46,6 +47,10 @@
 
 ReservedSpace* MetaspaceShared::_shared_rs = NULL;
 
+bool MetaspaceShared::_link_classes_made_progress;
+bool MetaspaceShared::_check_classes_made_progress;
+bool MetaspaceShared::_has_error_classes;
+bool MetaspaceShared::_archive_loading_failed = false;
 // Read/write a data stream for restoring/preserving metadata pointers and
 // miscellaneous data from/to the shared archive file.
 
@@ -445,6 +450,23 @@
   SystemDictionary::classes_do(collect_classes);
 
   tty->print_cr("Number of classes %d", _global_klass_objects->length());
+  {
+    int num_type_array = 0, num_obj_array = 0, num_inst = 0;
+    for (int i = 0; i < _global_klass_objects->length(); i++) {
+      Klass* k = _global_klass_objects->at(i);
+      if (k->oop_is_instance()) {
+        num_inst ++;
+      } else if (k->oop_is_objArray()) {
+        num_obj_array ++;
+      } else {
+        assert(k->oop_is_typeArray(), "sanity");
+        num_type_array ++;
+      }
+    }
+    tty->print_cr("    instance classes   = %5d", num_inst);
+    tty->print_cr("    obj array classes  = %5d", num_obj_array);
+    tty->print_cr("    type array classes = %5d", num_type_array);
+  }
 
   // Update all the fingerprints in the shared methods.
   tty->print("Calculating fingerprints ... ");
@@ -610,38 +632,58 @@
 #undef fmt_space
 }
 
-static void link_shared_classes(Klass* obj, TRAPS) {
+
+void MetaspaceShared::link_one_shared_class(Klass* obj, TRAPS) {
   Klass* k = obj;
   if (k->oop_is_instance()) {
     InstanceKlass* ik = (InstanceKlass*) k;
     // Link the class to cause the bytecodes to be rewritten and the
-    // cpcache to be created.
-    if (ik->init_state() < InstanceKlass::linked) {
-      ik->link_class(THREAD);
-      guarantee(!HAS_PENDING_EXCEPTION, "exception in class rewriting");
+    // cpcache to be created. Class verification is done according
+    // to -Xverify setting.
+    _link_classes_made_progress |= try_link_class(ik, THREAD);
+    guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
+  }
+}
+
+void MetaspaceShared::check_one_shared_class(Klass* k) {
+  if (k->oop_is_instance() && InstanceKlass::cast(k)->check_sharing_error_state()) {
+    _check_classes_made_progress = true;
+  }
+}
+
+void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) {
+  // We need to iterate because verification may cause additional classes
+  // to be loaded.
+  do {
+    _link_classes_made_progress = false;
+    SystemDictionary::classes_do(link_one_shared_class, THREAD);
+    guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
+  } while (_link_classes_made_progress);
+
+  if (_has_error_classes) {
+    // Mark all classes whose super class or interfaces failed verification.
+    do {
+      // Not completely sure if we need to do this iteratively. Anyway,
+      // we should come here only if there are unverifiable classes, which
+      // shouldn't happen in normal cases. So better safe than sorry.
+      _check_classes_made_progress = false;
+      SystemDictionary::classes_do(check_one_shared_class);
+    } while (_check_classes_made_progress);
+
+    if (IgnoreUnverifiableClassesDuringDump) {
+      // This is useful when running JCK or SQE tests. You should not
+      // enable this when running real apps.
+      SystemDictionary::remove_classes_in_error_state();
+    } else {
+      tty->print_cr("Please remove the unverifiable classes from your class list and try again");
+      exit(1);
     }
   }
 }
 
-
-// Support for a simple checksum of the contents of the class list
-// file to prevent trivial tampering. The algorithm matches that in
-// the MakeClassList program used by the J2SE build process.
-#define JSUM_SEED ((jlong)CONST64(0xcafebabebabecafe))
-static jlong
-jsum(jlong start, const char *buf, const int len)
-{
-    jlong h = start;
-    char *p = (char *)buf, *e = p + len;
-    while (p < e) {
-        char c = *p++;
-        if (c <= ' ') {
-            /* Skip spaces and control characters */
-            continue;
-        }
-        h = 31 * h + c;
-    }
-    return h;
+void MetaspaceShared::prepare_for_dumping() {
+  ClassLoader::initialize_shared_path();
+  FileMapInfo::allocate_classpath_entry_table();
 }
 
 // Preload classes from a list, populate the shared spaces and dump to a
@@ -650,72 +692,112 @@
   TraceTime timer("Dump Shared Spaces", TraceStartupTime);
   ResourceMark rm;
 
+  tty->print_cr("Allocated shared space: %d bytes at " PTR_FORMAT,
+                MetaspaceShared::shared_rs()->size(),
+                MetaspaceShared::shared_rs()->base());
+
   // Preload classes to be shared.
   // Should use some os:: method rather than fopen() here. aB.
-  // Construct the path to the class list (in jre/lib)
-  // Walk up two directories from the location of the VM and
-  // optionally tack on "lib" (depending on platform)
-  char class_list_path[JVM_MAXPATHLEN];
-  os::jvm_path(class_list_path, sizeof(class_list_path));
-  for (int i = 0; i < 3; i++) {
-    char *end = strrchr(class_list_path, *os::file_separator());
-    if (end != NULL) *end = '\0';
+  const char* class_list_path;
+  if (SharedClassListFile == NULL) {
+    // Construct the path to the class list (in jre/lib)
+    // Walk up two directories from the location of the VM and
+    // optionally tack on "lib" (depending on platform)
+    char class_list_path_str[JVM_MAXPATHLEN];
+    os::jvm_path(class_list_path_str, sizeof(class_list_path_str));
+    for (int i = 0; i < 3; i++) {
+      char *end = strrchr(class_list_path_str, *os::file_separator());
+      if (end != NULL) *end = '\0';
+    }
+    int class_list_path_len = (int)strlen(class_list_path_str);
+    if (class_list_path_len >= 3) {
+      if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) {
+        strcat(class_list_path_str, os::file_separator());
+        strcat(class_list_path_str, "lib");
+      }
+    }
+    strcat(class_list_path_str, os::file_separator());
+    strcat(class_list_path_str, "classlist");
+    class_list_path = class_list_path_str;
+  } else {
+    class_list_path = SharedClassListFile;
   }
-  int class_list_path_len = (int)strlen(class_list_path);
-  if (class_list_path_len >= 3) {
-    if (strcmp(class_list_path + class_list_path_len - 3, "lib") != 0) {
-      strcat(class_list_path, os::file_separator());
-      strcat(class_list_path, "lib");
-    }
+
+  int class_count = 0;
+  GrowableArray<Klass*>* class_promote_order = new GrowableArray<Klass*>();
+
+  // sun.io.Converters
+  static const char obj_array_sig[] = "[[Ljava/lang/Object;";
+  SymbolTable::new_permanent_symbol(obj_array_sig, THREAD);
+
+  // java.util.HashMap
+  static const char map_entry_array_sig[] = "[Ljava/util/Map$Entry;";
+  SymbolTable::new_permanent_symbol(map_entry_array_sig, THREAD);
+
+  tty->print_cr("Loading classes to share ...");
+  _has_error_classes = false;
+  class_count += preload_and_dump(class_list_path, class_promote_order,
+                                  THREAD);
+  if (ExtraSharedClassListFile) {
+    class_count += preload_and_dump(ExtraSharedClassListFile, class_promote_order,
+                                    THREAD);
+  }
+  tty->print_cr("Loading classes to share: done.");
+
+  if (PrintSharedSpaces) {
+    tty->print_cr("Shared spaces: preloaded %d classes", class_count);
   }
-  strcat(class_list_path, os::file_separator());
-  strcat(class_list_path, "classlist");
+
+  // Rewrite and link classes
+  tty->print_cr("Rewriting and linking classes ...");
+
+  // Link any classes which got missed. This would happen if we have loaded classes that
+  // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
+  // fails verification, all other interfaces that were not specified in the classlist but
+  // are implemented by K are not verified.
+  link_and_cleanup_shared_classes(CATCH);
+  tty->print_cr("Rewriting and linking classes: done");
 
+  // Create and dump the shared spaces.   Everything so far is loaded
+  // with the null class loader.
+  ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
+  VM_PopulateDumpSharedSpace op(loader_data, class_promote_order);
+  VMThread::execute(&op);
+
+  // Since various initialization steps have been undone by this process,
+  // it is not reasonable to continue running a java process.
+  exit(0);
+}
+
+int MetaspaceShared::preload_and_dump(const char * class_list_path,
+                                      GrowableArray<Klass*>* class_promote_order,
+                                      TRAPS) {
   FILE* file = fopen(class_list_path, "r");
+  char class_name[256];
+  int class_count = 0;
+
   if (file != NULL) {
-    jlong computed_jsum  = JSUM_SEED;
-    jlong file_jsum      = 0;
-
-    char class_name[256];
-    int class_count = 0;
-    GrowableArray<Klass*>* class_promote_order = new GrowableArray<Klass*>();
-
-    // sun.io.Converters
-    static const char obj_array_sig[] = "[[Ljava/lang/Object;";
-    SymbolTable::new_permanent_symbol(obj_array_sig, THREAD);
-
-    // java.util.HashMap
-    static const char map_entry_array_sig[] = "[Ljava/util/Map$Entry;";
-    SymbolTable::new_permanent_symbol(map_entry_array_sig, THREAD);
-
-    tty->print("Loading classes to share ... ");
     while ((fgets(class_name, sizeof class_name, file)) != NULL) {
-      if (*class_name == '#') {
-        jint fsh, fsl;
-        if (sscanf(class_name, "# %8x%8x\n", &fsh, &fsl) == 2) {
-          file_jsum = ((jlong)(fsh) << 32) | (fsl & 0xffffffff);
-        }
-
+      if (*class_name == '#') { // comment
         continue;
       }
       // Remove trailing newline
       size_t name_len = strlen(class_name);
-      class_name[name_len-1] = '\0';
-
-      computed_jsum = jsum(computed_jsum, class_name, (const int)name_len - 1);
+      if (class_name[name_len-1] == '\n') {
+        class_name[name_len-1] = '\0';
+      }
 
       // Got a class name - load it.
       TempNewSymbol class_name_symbol = SymbolTable::new_permanent_symbol(class_name, THREAD);
       guarantee(!HAS_PENDING_EXCEPTION, "Exception creating a symbol.");
       Klass* klass = SystemDictionary::resolve_or_null(class_name_symbol,
                                                          THREAD);
-      guarantee(!HAS_PENDING_EXCEPTION, "Exception resolving a class.");
+      CLEAR_PENDING_EXCEPTION;
       if (klass != NULL) {
         if (PrintSharedSpaces && Verbose && WizardMode) {
           tty->print_cr("Shared spaces preloaded: %s", class_name);
         }
 
-
         InstanceKlass* ik = InstanceKlass::cast(klass);
 
         // Should be class load order as per -XX:+TraceClassLoadingPreorder
@@ -725,52 +807,14 @@
         // cpcache to be created. The linking is done as soon as classes
         // are loaded in order that the related data structures (klass and
         // cpCache) are located together.
-
-        if (ik->init_state() < InstanceKlass::linked) {
-          ik->link_class(THREAD);
-          guarantee(!(HAS_PENDING_EXCEPTION), "exception in class rewriting");
-        }
-
-        // TODO: Resolve klasses in constant pool
-        ik->constants()->resolve_class_constants(THREAD);
+        try_link_class(ik, THREAD);
+        guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
 
         class_count++;
       } else {
-        if (PrintSharedSpaces && Verbose && WizardMode) {
-          tty->cr();
-          tty->print_cr(" Preload failed: %s", class_name);
-        }
+        //tty->print_cr("Preload failed: %s", class_name);
       }
-      file_jsum = 0; // Checksum must be on last line of file
-    }
-    if (computed_jsum != file_jsum) {
-      tty->cr();
-      tty->print_cr("Preload failed: checksum of class list was incorrect.");
-      exit(1);
-    }
-
-    tty->print_cr("done. ");
-
-    if (PrintSharedSpaces) {
-      tty->print_cr("Shared spaces: preloaded %d classes", class_count);
     }
-
-    // Rewrite and unlink classes.
-    tty->print("Rewriting and linking classes ... ");
-
-    // Link any classes which got missed.  (It's not quite clear why
-    // they got missed.)  This iteration would be unsafe if we weren't
-    // single-threaded at this point; however we can't do it on the VM
-    // thread because it requires object allocation.
-    SystemDictionary::classes_do(link_shared_classes, CATCH);
-    tty->print_cr("done. ");
-
-    // Create and dump the shared spaces.   Everything so far is loaded
-    // with the null class loader.
-    ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
-    VM_PopulateDumpSharedSpace op(loader_data, class_promote_order);
-    VMThread::execute(&op);
-
   } else {
     char errmsg[JVM_MAXPATHLEN];
     os::lasterror(errmsg, JVM_MAXPATHLEN);
@@ -778,11 +822,39 @@
     exit(1);
   }
 
-  // Since various initialization steps have been undone by this process,
-  // it is not reasonable to continue running a java process.
-  exit(0);
+  return class_count;
 }
 
+// Returns true if the class's status has changed
+bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) {
+  assert(DumpSharedSpaces, "should only be called during dumping");
+  if (ik->init_state() < InstanceKlass::linked) {
+    bool saved = BytecodeVerificationLocal;
+    if (!SharedClassUtil::is_shared_boot_class(ik)) {
+      // The verification decision is based on BytecodeVerificationRemote
+      // for non-system classes. Since we are using the NULL classloader
+      // to load non-system classes during dumping, we need to temporarily
+      // change BytecodeVerificationLocal to be the same as
+      // BytecodeVerificationRemote. Note this can cause the parent system
+      // classes also being verified. The extra overhead is acceptable during
+      // dumping.
+      BytecodeVerificationLocal = BytecodeVerificationRemote;
+    }
+    ik->link_class(THREAD);
+    if (HAS_PENDING_EXCEPTION) {
+      ResourceMark rm;
+      tty->print_cr("Preload Error: Verification failed for %s",
+                    ik->external_name());
+      CLEAR_PENDING_EXCEPTION;
+      ik->set_in_error_state();
+      _has_error_classes = true;
+    }
+    BytecodeVerificationLocal = saved;
+    return true;
+  } else {
+    return false;
+  }
+}
 
 // Closure for serializing initialization data in from a data area
 // (ptr_array) read from the shared file.
@@ -866,7 +938,8 @@
       (_rw_base = mapinfo->map_region(rw)) != NULL &&
       (_md_base = mapinfo->map_region(md)) != NULL &&
       (_mc_base = mapinfo->map_region(mc)) != NULL &&
-      (image_alignment == (size_t)max_alignment())) {
+      (image_alignment == (size_t)max_alignment()) &&
+      mapinfo->validate_classpath_entry_table()) {
     // Success (no need to do anything)
     return true;
   } else {
@@ -883,7 +956,7 @@
     // If -Xshare:on is specified, print out the error message and exit VM,
     // otherwise, set UseSharedSpaces to false and continue.
     if (RequireSharedSpaces) {
-      vm_exit_during_initialization("Unable to use shared archive.", NULL);
+      vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on.");
     } else {
       FLAG_SET_DEFAULT(UseSharedSpaces, false);
     }
@@ -983,6 +1056,20 @@
 
   // Close the mapinfo file
   mapinfo->close();
+
+  if (PrintSharedArchiveAndExit) {
+    if (PrintSharedDictionary) {
+      tty->print_cr("\nShared classes:\n");
+      SystemDictionary::print_shared(false);
+    }
+    if (_archive_loading_failed) {
+      tty->print_cr("archive is invalid");
+      vm_exit(1);
+    } else {
+      tty->print_cr("archive is valid");
+      vm_exit(0);
+    }
+  }
 }
 
 // JVM/TI RedefineClasses() support:
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/memory/metaspaceShared.hpp
--- a/src/share/vm/memory/metaspaceShared.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/memory/metaspaceShared.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -38,7 +38,10 @@
   // CDS support
   static ReservedSpace* _shared_rs;
   static int _max_alignment;
-
+  static bool _link_classes_made_progress;
+  static bool _check_classes_made_progress;
+  static bool _has_error_classes;
+  static bool _archive_loading_failed;
  public:
   enum {
     vtbl_list_size = 17, // number of entries in the shared space vtable list.
@@ -67,7 +70,11 @@
     NOT_CDS(return 0);
   }
 
+  static void prepare_for_dumping() NOT_CDS_RETURN;
   static void preload_and_dump(TRAPS) NOT_CDS_RETURN;
+  static int preload_and_dump(const char * class_list_path,
+                              GrowableArray<Klass*>* class_promote_order,
+                              TRAPS) NOT_CDS_RETURN;
 
   static ReservedSpace* shared_rs() {
     CDS_ONLY(return _shared_rs);
@@ -78,6 +85,9 @@
     CDS_ONLY(_shared_rs = rs;)
   }
 
+  static void set_archive_loading_failed() {
+    _archive_loading_failed = true;
+  }
   static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false);
   static void initialize_shared_spaces() NOT_CDS_RETURN;
 
@@ -97,5 +107,10 @@
   static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true);
 
   static void print_shared_spaces();
+
+  static bool try_link_class(InstanceKlass* ik, TRAPS);
+  static void link_one_shared_class(Klass* obj, TRAPS);
+  static void check_one_shared_class(Klass* obj);
+  static void link_and_cleanup_shared_classes(TRAPS);
 };
 #endif // SHARE_VM_MEMORY_METASPACE_SHARED_HPP
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/memory/universe.cpp
--- a/src/share/vm/memory/universe.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/memory/universe.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -26,6 +26,9 @@
 #include "classfile/classLoader.hpp"
 #include "classfile/classLoaderData.hpp"
 #include "classfile/javaClasses.hpp"
+#if INCLUDE_CDS
+#include "classfile/sharedClassUtil.hpp"
+#endif
 #include "classfile/symbolTable.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
@@ -34,6 +37,7 @@
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "interpreter/interpreter.hpp"
 #include "memory/cardTableModRefBS.hpp"
+#include "memory/filemap.hpp"
 #include "memory/gcLocker.inline.hpp"
 #include "memory/genCollectedHeap.hpp"
 #include "memory/genRemSet.hpp"
@@ -238,8 +242,9 @@
 void initialize_basic_type_klass(Klass* k, TRAPS) {
   Klass* ok = SystemDictionary::Object_klass();
   if (UseSharedSpaces) {
+    ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
     assert(k->super() == ok, "u3");
-    k->restore_unshareable_info(CHECK);
+    k->restore_unshareable_info(loader_data, Handle(), CHECK);
   } else {
     k->initialize_supers(ok, CHECK);
   }
@@ -665,6 +670,10 @@
     SymbolTable::create_table();
     StringTable::create_table();
     ClassLoader::create_package_info_table();
+
+    if (DumpSharedSpaces) {
+      MetaspaceShared::prepare_for_dumping();
+    }
   }
 
   return JNI_OK;
@@ -1166,6 +1175,11 @@
   MemoryService::add_metaspace_memory_pools();
 
   MemoryService::set_universe_heap(Universe::_collectedHeap);
+#if INCLUDE_CDS
+  if (UseSharedSpaces) {
+    SharedClassUtil::initialize(CHECK_false);
+  }
+#endif
   return true;
 }
 
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/oops/arrayKlass.cpp
--- a/src/share/vm/oops/arrayKlass.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/oops/arrayKlass.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -186,8 +186,9 @@
   set_component_mirror(NULL);
 }
 
-void ArrayKlass::restore_unshareable_info(TRAPS) {
-  Klass::restore_unshareable_info(CHECK);
+void ArrayKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
+  assert(loader_data == ClassLoaderData::the_null_class_loader_data(), "array classes belong to null loader");
+  Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
   // Klass recreates the component mirror also
 }
 
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/oops/arrayKlass.hpp
--- a/src/share/vm/oops/arrayKlass.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/oops/arrayKlass.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -137,7 +137,7 @@
 
   // CDS support - remove and restore oops from metadata. Oops are not shared.
   virtual void remove_unshareable_info();
-  virtual void restore_unshareable_info(TRAPS);
+  virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
 
   // Printing
   void print_on(outputStream* st) const;
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/oops/instanceKlass.cpp
--- a/src/share/vm/oops/instanceKlass.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/oops/instanceKlass.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -66,7 +66,7 @@
 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
 #include "gc_implementation/g1/g1OopClosures.inline.hpp"
 #include "gc_implementation/g1/g1RemSet.inline.hpp"
-#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
+#include "gc_implementation/g1/heapRegionManager.inline.hpp"
 #include "gc_implementation/parNew/parOopClosures.inline.hpp"
 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp"
 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
@@ -2321,12 +2321,14 @@
   array_klasses_do(remove_unshareable_in_class);
 }
 
-void restore_unshareable_in_class(Klass* k, TRAPS) {
-  k->restore_unshareable_info(CHECK);
+static void restore_unshareable_in_class(Klass* k, TRAPS) {
+  // Array classes have null protection domain.
+  // --> see ArrayKlass::complete_create_array_klass()
+  k->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
 }
 
-void InstanceKlass::restore_unshareable_info(TRAPS) {
-  Klass::restore_unshareable_info(CHECK);
+void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
+  Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
   instanceKlassHandle ik(THREAD, this);
 
   Array<Method*>* methods = ik->methods();
@@ -2352,6 +2354,38 @@
   ik->array_klasses_do(restore_unshareable_in_class, CHECK);
 }
 
+// returns true IFF is_in_error_state() has been changed as a result of this call.
+bool InstanceKlass::check_sharing_error_state() {
+  assert(DumpSharedSpaces, "should only be called during dumping");
+  bool old_state = is_in_error_state();
+
+  if (!is_in_error_state()) {
+    bool bad = false;
+    for (InstanceKlass* sup = java_super(); sup; sup = sup->java_super()) {
+      if (sup->is_in_error_state()) {
+        bad = true;
+        break;
+      }
+    }
+    if (!bad) {
+      Array<Klass*>* interfaces = transitive_interfaces();
+      for (int i = 0; i < interfaces->length(); i++) {
+        Klass* iface = interfaces->at(i);
+        if (InstanceKlass::cast(iface)->is_in_error_state()) {
+          bad = true;
+          break;
+        }
+      }
+    }
+
+    if (bad) {
+      set_in_error_state();
+    }
+  }
+
+  return (old_state != is_in_error_state());
+}
+
 static void clear_all_breakpoints(Method* m) {
   m->clear_all_breakpoints();
 }
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/oops/instanceKlass.hpp
--- a/src/share/vm/oops/instanceKlass.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/oops/instanceKlass.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -1004,6 +1004,13 @@
 
   u2 idnum_allocated_count() const      { return _idnum_allocated_count; }
 
+public:
+  void set_in_error_state() {
+    assert(DumpSharedSpaces, "only call this when dumping archive");
+    _init_state = initialization_error;
+  }
+  bool check_sharing_error_state();
+
 private:
   // initialization state
 #ifdef ASSERT
@@ -1062,7 +1069,7 @@
 public:
   // CDS support - remove and restore oops from metadata. Oops are not shared.
   virtual void remove_unshareable_info();
-  virtual void restore_unshareable_info(TRAPS);
+  virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
 
   // jvm support
   jint compute_modifier_flags(TRAPS) const;
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/oops/instanceMirrorKlass.cpp
--- a/src/share/vm/oops/instanceMirrorKlass.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/oops/instanceMirrorKlass.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -42,7 +42,7 @@
 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
 #include "gc_implementation/g1/g1OopClosures.inline.hpp"
 #include "gc_implementation/g1/g1RemSet.inline.hpp"
-#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
+#include "gc_implementation/g1/heapRegionManager.inline.hpp"
 #include "gc_implementation/parNew/parOopClosures.inline.hpp"
 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/oops/instanceRefKlass.cpp
--- a/src/share/vm/oops/instanceRefKlass.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/oops/instanceRefKlass.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -38,7 +38,7 @@
 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
 #include "gc_implementation/g1/g1OopClosures.inline.hpp"
 #include "gc_implementation/g1/g1RemSet.inline.hpp"
-#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
+#include "gc_implementation/g1/heapRegionManager.inline.hpp"
 #include "gc_implementation/parNew/parOopClosures.inline.hpp"
 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/oops/klass.cpp
--- a/src/share/vm/oops/klass.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/oops/klass.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -184,6 +184,7 @@
   // The klass doesn't have any references at this point.
   clear_modified_oops();
   clear_accumulated_modified_oops();
+  _shared_class_path_index = -1;
 }
 
 jint Klass::array_layout_helper(BasicType etype) {
@@ -508,27 +509,25 @@
   set_class_loader_data(NULL);
 }
 
-void Klass::restore_unshareable_info(TRAPS) {
+void Klass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
   TRACE_INIT_ID(this);
   // If an exception happened during CDS restore, some of these fields may already be
   // set.  We leave the class on the CLD list, even if incomplete so that we don't
   // modify the CLD list outside a safepoint.
   if (class_loader_data() == NULL) {
-    ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
-    // Restore class_loader_data to the null class loader data
+    // Restore class_loader_data
     set_class_loader_data(loader_data);
 
-    // Add to null class loader list first before creating the mirror
+    // Add to class loader list first before creating the mirror
     // (same order as class file parsing)
     loader_data->add_class(this);
   }
 
-  // Recreate the class mirror.  The protection_domain is always null for
-  // boot loader, for now.
+  // Recreate the class mirror.
   // Only recreate it if not present.  A previous attempt to restore may have
   // gotten an OOM later but keep the mirror if it was created.
   if (java_mirror() == NULL) {
-    java_lang_Class::create_mirror(this, Handle(NULL), CHECK);
+    java_lang_Class::create_mirror(this, protection_domain, CHECK);
   }
 }
 
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/oops/klass.hpp
--- a/src/share/vm/oops/klass.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/oops/klass.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -175,6 +175,16 @@
   jbyte _modified_oops;             // Card Table Equivalent (YC/CMS support)
   jbyte _accumulated_modified_oops; // Mod Union Equivalent (CMS support)
 
+private:
+  // This is an index into FileMapHeader::_classpath_entry_table[], to
+  // associate this class with the JAR file where it's loaded from during
+  // dump time. If a class is not loaded from the shared archive, this field is
+  // -1.
+  jshort _shared_class_path_index;
+
+  friend class SharedClassUtil;
+protected:
+
   // Constructor
   Klass();
 
@@ -281,6 +291,15 @@
   void clear_accumulated_modified_oops() { _accumulated_modified_oops = 0; }
   bool has_accumulated_modified_oops()   { return _accumulated_modified_oops == 1; }
 
+  int shared_classpath_index() const   {
+    return _shared_class_path_index;
+  };
+
+  void set_shared_classpath_index(int index) {
+    _shared_class_path_index = index;
+  };
+
+
  protected:                                // internal accessors
   Klass* subklass_oop() const            { return _subklass; }
   Klass* next_sibling_oop() const        { return _next_sibling; }
@@ -452,7 +471,7 @@
  public:
   // CDS support - remove and restore oops from metadata. Oops are not shared.
   virtual void remove_unshareable_info();
-  virtual void restore_unshareable_info(TRAPS);
+  virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
 
  protected:
   // computes the subtype relationship
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/oops/objArrayKlass.cpp
--- a/src/share/vm/oops/objArrayKlass.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/oops/objArrayKlass.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -51,7 +51,7 @@
 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
 #include "gc_implementation/g1/g1OopClosures.inline.hpp"
 #include "gc_implementation/g1/g1RemSet.inline.hpp"
-#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
+#include "gc_implementation/g1/heapRegionManager.inline.hpp"
 #include "gc_implementation/parNew/parOopClosures.inline.hpp"
 #include "gc_implementation/parallelScavenge/psCompactionManager.hpp"
 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/prims/jvm.cpp
--- a/src/share/vm/prims/jvm.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/prims/jvm.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -28,6 +28,10 @@
 #include "classfile/javaClasses.hpp"
 #include "classfile/symbolTable.hpp"
 #include "classfile/systemDictionary.hpp"
+#if INCLUDE_CDS
+#include "classfile/sharedClassUtil.hpp"
+#include "classfile/systemDictionaryShared.hpp"
+#endif
 #include "classfile/vmSymbols.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "interpreter/bytecode.hpp"
@@ -996,7 +1000,15 @@
                                                               h_loader,
                                                               Handle(),
                                                               CHECK_NULL);
-
+#if INCLUDE_CDS
+  if (k == NULL) {
+    // If the class is not already loaded, try to see if it's in the shared
+    // archive for the current classloader (h_loader).
+    instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class(
+        klass_name, h_loader, CHECK_NULL);
+    k = ik();
+  }
+#endif
   return (k == NULL) ? NULL :
             (jclass) JNIHandles::make_local(env, k->java_mirror());
 JVM_END
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/runtime/arguments.cpp
--- a/src/share/vm/runtime/arguments.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/runtime/arguments.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -23,6 +23,7 @@
  */
 
 #include "precompiled.hpp"
+#include "classfile/classLoader.hpp"
 #include "classfile/javaAssertions.hpp"
 #include "classfile/symbolTable.hpp"
 #include "compiler/compilerOracle.hpp"
@@ -40,6 +41,7 @@
 #include "services/memTracker.hpp"
 #include "utilities/defaultStream.hpp"
 #include "utilities/macros.hpp"
+#include "utilities/stringUtils.hpp"
 #include "utilities/taskqueue.hpp"
 #ifdef TARGET_OS_FAMILY_linux
 # include "os_linux.inline.hpp"
@@ -1111,11 +1113,11 @@
 // Conflict: required to use shared spaces (-Xshare:on), but
 // incompatible command line options were chosen.
 
-static void no_shared_spaces() {
+static void no_shared_spaces(const char* message) {
   if (RequireSharedSpaces) {
     jio_fprintf(defaultStream::error_stream(),
       "Class data sharing is inconsistent with other specified options.\n");
-    vm_exit_during_initialization("Unable to use shared archive.", NULL);
+    vm_exit_during_initialization("Unable to use shared archive.", message);
   } else {
     FLAG_SET_DEFAULT(UseSharedSpaces, false);
   }
@@ -1556,7 +1558,7 @@
   // at link time, or rewrite bytecodes in non-shared methods.
   if (!DumpSharedSpaces && !RequireSharedSpaces &&
       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
-    no_shared_spaces();
+    no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
   }
 #endif
 
@@ -3251,6 +3253,15 @@
     }
   }
 
+  // PrintSharedArchiveAndExit will turn on
+  //   -Xshare:on
+  //   -XX:+TraceClassPaths
+  if (PrintSharedArchiveAndExit) {
+    FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
+    FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
+    FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
+  }
+
   // Change the default value for flags  which have different default values
   // when working with older JDKs.
 #ifdef LINUX
@@ -3259,9 +3270,55 @@
     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
   }
 #endif // LINUX
+  fix_appclasspath();
   return JNI_OK;
 }
 
+// Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
+//
+// This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
+// in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
+// Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
+// path is treated as the current directory.
+//
+// This causes problems with CDS, which requires that all directories specified in the classpath
+// must be empty. In most cases, applications do NOT want to load classes from the current
+// directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
+// scripts compatible with CDS.
+void Arguments::fix_appclasspath() {
+  if (IgnoreEmptyClassPaths) {
+    const char separator = *os::path_separator();
+    const char* src = _java_class_path->value();
+
+    // skip over all the leading empty paths
+    while (*src == separator) {
+      src ++;
+    }
+
+    char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
+    strncpy(copy, src, strlen(src) + 1);
+
+    // trim all trailing empty paths
+    for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
+      *tail = '\0';
+    }
+
+    char from[3] = {separator, separator, '\0'};
+    char to  [2] = {separator, '\0'};
+    while (StringUtils::replace_no_expand(copy, from, to) > 0) {
+      // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
+      // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
+    }
+
+    _java_class_path->set_value(copy);
+    FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
+  }
+
+  if (!PrintSharedArchiveAndExit) {
+    ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
+  }
+}
+
 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
   // This must be done after all -D arguments have been processed.
   scp_p->expand_endorsed();
@@ -3432,9 +3489,8 @@
         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
     }
   } else {
-    // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
     if (!UseCompressedOops || !UseCompressedClassPointers) {
-      no_shared_spaces();
+      no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
     }
 #endif
   }
@@ -3692,7 +3748,7 @@
     FLAG_SET_DEFAULT(UseSharedSpaces, false);
     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
   }
-  no_shared_spaces();
+  no_shared_spaces("CDS Disabled");
 #endif // INCLUDE_CDS
 
   return JNI_OK;
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/runtime/arguments.hpp
--- a/src/share/vm/runtime/arguments.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/runtime/arguments.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -585,12 +585,15 @@
     _meta_index_dir  = meta_index_dir;
   }
 
-  static char *get_java_home() { return _java_home->value(); }
-  static char *get_dll_dir() { return _sun_boot_library_path->value(); }
-  static char *get_endorsed_dir() { return _java_endorsed_dirs->value(); }
-  static char *get_sysclasspath() { return _sun_boot_class_path->value(); }
+  static char* get_java_home() { return _java_home->value(); }
+  static char* get_dll_dir() { return _sun_boot_library_path->value(); }
+  static char* get_endorsed_dir() { return _java_endorsed_dirs->value(); }
+  static char* get_sysclasspath() { return _sun_boot_class_path->value(); }
   static char* get_meta_index_path() { return _meta_index_path; }
   static char* get_meta_index_dir()  { return _meta_index_dir;  }
+  static char* get_ext_dirs() { return _java_ext_dirs->value(); }
+  static char* get_appclasspath() { return _java_class_path->value(); }
+  static void  fix_appclasspath();
 
   // Operation modi
   static Mode mode()                        { return _mode; }
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/runtime/globals.hpp
--- a/src/share/vm/runtime/globals.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/runtime/globals.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -2334,6 +2334,12 @@
   notproduct(bool, TraceScavenge, false,                                    \
           "Trace scavenge")                                                 \
                                                                             \
+  product(bool, IgnoreEmptyClassPaths, false,                               \
+          "Ignore empty path elements in -classpath")                       \
+                                                                            \
+  product(bool, TraceClassPaths, false,                                     \
+          "Trace processing of class paths")                                \
+                                                                            \
   product_rw(bool, TraceClassLoading, false,                                \
           "Trace all classes loaded")                                       \
                                                                             \
@@ -3780,6 +3786,13 @@
   product(bool, PrintSharedSpaces, false,                                   \
           "Print usage of shared spaces")                                   \
                                                                             \
+  product(bool, PrintSharedArchiveAndExit, false,                           \
+          "Print shared archive file contents")                             \
+                                                                            \
+  product(bool, PrintSharedDictionary, false,                               \
+          "If PrintSharedArchiveAndExit is true, also print the shared "    \
+          "dictionary")                                                     \
+                                                                            \
   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
           "Size of read-write space for metadata (in bytes)")               \
                                                                             \
@@ -3800,6 +3813,10 @@
           "support JSR 292 (method handles, invokedynamic, "                \
           "anonymous classes")                                              \
                                                                             \
+  diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
+          "Do not quit -Xshare:dump even if we encounter unverifiable "     \
+          "classes. Just exclude them from the shared dictionary.")         \
+                                                                            \
   diagnostic(bool, PrintMethodHandleStubs, false,                           \
           "Print generated stub code for method handles")                   \
                                                                             \
@@ -3895,9 +3912,19 @@
   product(bool , AllowNonVirtualCalls, false,                               \
           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
                                                                             \
+  product(ccstr, DumpLoadedClassList, NULL,                                 \
+          "Dump the names all loaded classes, that could be stored into "   \
+          "the CDS archive, in the specified file")                         \
+                                                                            \
+  product(ccstr, SharedClassListFile, NULL,                                 \
+          "Override the default CDS class list")                            \
+                                                                            \
   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
           "Override the default location of the CDS archive file")          \
                                                                             \
+  product(ccstr, ExtraSharedClassListFile, NULL,                            \
+          "Extra classlist for building the CDS archive file")              \
+                                                                            \
   experimental(uintx, ArrayAllocatorMallocLimit,                            \
           SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx),                        \
           "Allocation less than this value will be allocated "              \
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/runtime/javaCalls.cpp
--- a/src/share/vm/runtime/javaCalls.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/runtime/javaCalls.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -308,6 +308,10 @@
 }
 
 void JavaCalls::call_helper(JavaValue* result, methodHandle* m, JavaCallArguments* args, TRAPS) {
+  // During dumping, Java execution environment is not fully initialized. Also, Java execution
+  // may cause undesirable side-effects in the class metadata.
+  assert(!DumpSharedSpaces, "must not execute Java bytecodes when dumping");
+
   methodHandle method = *m;
   JavaThread* thread = (JavaThread*)THREAD;
   assert(thread->is_Java_thread(), "must be called by a java thread");
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/runtime/vmStructs.cpp
--- a/src/share/vm/runtime/vmStructs.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/runtime/vmStructs.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -320,7 +320,7 @@
   nonstatic_field(InstanceKlass,               _jni_ids,                                      JNIid*)                                \
   nonstatic_field(InstanceKlass,               _osr_nmethods_head,                            nmethod*)                              \
   nonstatic_field(InstanceKlass,               _breakpoints,                                  BreakpointInfo*)                       \
-  nonstatic_field(InstanceKlass,               _generic_signature_index,                           u2)                               \
+  nonstatic_field(InstanceKlass,               _generic_signature_index,                      u2)                                    \
   nonstatic_field(InstanceKlass,               _methods_jmethod_ids,                          jmethodID*)                            \
   volatile_nonstatic_field(InstanceKlass,      _idnum_allocated_count,                        u2)                                    \
   nonstatic_field(InstanceKlass,               _annotations,                                  Annotations*)                          \
@@ -665,6 +665,7 @@
       static_field(SystemDictionary,            WK_KLASS(StackOverflowError_klass),            Klass*)                               \
       static_field(SystemDictionary,            WK_KLASS(ProtectionDomain_klass),              Klass*)                               \
       static_field(SystemDictionary,            WK_KLASS(AccessControlContext_klass),          Klass*)                               \
+      static_field(SystemDictionary,            WK_KLASS(SecureClassLoader_klass),             Klass*)                               \
       static_field(SystemDictionary,            WK_KLASS(Reference_klass),                     Klass*)                               \
       static_field(SystemDictionary,            WK_KLASS(SoftReference_klass),                 Klass*)                               \
       static_field(SystemDictionary,            WK_KLASS(WeakReference_klass),                 Klass*)                               \
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/utilities/exceptions.cpp
--- a/src/share/vm/utilities/exceptions.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/utilities/exceptions.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -85,9 +85,13 @@
 #endif // ASSERT
 
   if (thread->is_VM_thread()
-      || thread->is_Compiler_thread() ) {
+      || thread->is_Compiler_thread()
+      || DumpSharedSpaces ) {
     // We do not care what kind of exception we get for the vm-thread or a thread which
     // is compiling.  We just install a dummy exception object
+    //
+    // We also cannot throw a proper exception when dumping, because we cannot run
+    // Java bytecodes now. A dummy exception will suffice.
     thread->set_pending_exception(Universe::vm_exception(), file, line);
     return true;
   }
@@ -108,9 +112,13 @@
   }
 
   if (thread->is_VM_thread()
-      || thread->is_Compiler_thread() ) {
+      || thread->is_Compiler_thread()
+      || DumpSharedSpaces ) {
     // We do not care what kind of exception we get for the vm-thread or a thread which
     // is compiling.  We just install a dummy exception object
+    //
+    // We also cannot throw a proper exception when dumping, because we cannot run
+    // Java bytecodes now. A dummy exception will suffice.
     thread->set_pending_exception(Universe::vm_exception(), file, line);
     return true;
   }
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/utilities/ostream.cpp
--- a/src/share/vm/utilities/ostream.cpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/utilities/ostream.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -365,6 +365,7 @@
 xmlStream*   xtty;
 outputStream* tty;
 outputStream* gclog_or_tty;
+CDS_ONLY(fileStream* classlist_file;) // Only dump the classes that can be stored into the CDS archive
 extern Mutex* tty_lock;
 
 #define EXTRACHARLEN   32
@@ -476,7 +477,8 @@
   return buf;
 }
 
-// log_name comes from -XX:LogFile=log_name or -Xloggc:log_name
+// log_name comes from -XX:LogFile=log_name, -Xloggc:log_name or
+// -XX:DumpLoadedClassList=<file_name>
 // in log_name, %p => pid1234 and
 //              %t => YYYY-MM-DD_HH-MM-SS
 static const char* make_log_name(const char* log_name, const char* force_directory) {
@@ -1116,6 +1118,16 @@
     gclog_or_tty = gclog;
   }
 
+#if INCLUDE_CDS
+  // For -XX:DumpLoadedClassList=<file> option
+  if (DumpLoadedClassList != NULL) {
+    const char* list_name = make_log_name(DumpLoadedClassList, NULL);
+    classlist_file = new(ResourceObj::C_HEAP, mtInternal)
+                         fileStream(list_name);
+    FREE_C_HEAP_ARRAY(char, list_name, mtInternal);
+  }
+#endif
+
   // If we haven't lazily initialized the logfile yet, do it now,
   // to avoid the possibility of lazy initialization during a VM
   // crash, which can affect the stability of the fatal error handler.
@@ -1128,6 +1140,11 @@
   static bool ostream_exit_called = false;
   if (ostream_exit_called)  return;
   ostream_exit_called = true;
+#if INCLUDE_CDS
+  if (classlist_file != NULL) {
+    delete classlist_file;
+  }
+#endif
   if (gclog_or_tty != tty) {
       delete gclog_or_tty;
   }
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/utilities/ostream.hpp
--- a/src/share/vm/utilities/ostream.hpp	Tue Sep 02 11:42:01 2014 -0700
+++ b/src/share/vm/utilities/ostream.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -214,6 +214,8 @@
   void flush();
 };
 
+CDS_ONLY(extern fileStream*   classlist_file;)
+
 // unlike fileStream, fdStream does unbuffered I/O by calling
 // open() and write() directly. It is async-safe, but output
 // from multiple thread may be mixed together. Used by fatal
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/utilities/stringUtils.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/utilities/stringUtils.cpp	Wed Sep 03 08:52:08 2014 -0700
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "utilities/stringUtils.hpp"
+
+int StringUtils::replace_no_expand(char* string, const char* from, const char* to) {
+  int replace_count = 0;
+  size_t from_len = strlen(from);
+  size_t to_len = strlen(to);
+  assert(from_len >= to_len, "must not expand input");
+
+  for (char* dst = string; *dst && (dst = strstr(dst, from)) != NULL;) {
+    char* left_over = dst + from_len;
+    memmove(dst, to, to_len);                       // does not copy trailing 0 of <to>
+    dst += to_len;                                  // skip over the replacement.
+    memmove(dst, left_over, strlen(left_over) + 1); // copies the trailing 0 of <left_over>
+    ++ replace_count;
+  }
+
+  return replace_count;
+}
diff -r a178c2e6f85f -r 7430aa5718a5 src/share/vm/utilities/stringUtils.hpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/utilities/stringUtils.hpp	Wed Sep 03 08:52:08 2014 -0700
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_UTILITIES_STRINGUTILS_HPP
+#define SHARE_VM_UTILITIES_STRINGUTILS_HPP
+
+#include "memory/allocation.hpp"
+
+class StringUtils : AllStatic {
+public:
+  // Replace the substring <from> with another string <to>. <to> must be
+  // no longer than <from>. The input string is modified in-place.
+  //
+  // Replacement is done in a single pass left-to-right. So replace_no_expand("aaa", "aa", "a")
+  // will result in "aa", not "a".
+  //
+  // Returns the count of substrings that have been replaced.
+  static int replace_no_expand(char* string, const char* from, const char* to);
+};
+
+#endif // SHARE_VM_UTILITIES_STRINGUTILS_HPP
diff -r a178c2e6f85f -r 7430aa5718a5 test/TEST.groups
--- a/test/TEST.groups	Tue Sep 02 11:42:01 2014 -0700
+++ b/test/TEST.groups	Wed Sep 03 08:52:08 2014 -0700
@@ -137,6 +137,7 @@
   gc/6581734/Test6581734.java \
   gc/7072527/TestFullGCCount.java \
   gc/g1/TestHumongousAllocInitialMark.java \
+  gc/g1/TestHumongousShrinkHeap.java \
   gc/arguments/TestG1HeapRegionSize.java \
   gc/metaspace/TestMetaspaceMemoryPool.java \
   gc/arguments/TestDynMinHeapFreeRatio.java \
diff -r a178c2e6f85f -r 7430aa5718a5 test/compiler/classUnloading/methodUnloading/TestMethodUnloading.java
--- a/test/compiler/classUnloading/methodUnloading/TestMethodUnloading.java	Tue Sep 02 11:42:01 2014 -0700
+++ b/test/compiler/classUnloading/methodUnloading/TestMethodUnloading.java	Wed Sep 03 08:52:08 2014 -0700
@@ -35,7 +35,7 @@
  * @build TestMethodUnloading
  * @build WorkerClass
  * @run main ClassFileInstaller sun.hotspot.WhiteBox
- * @run main/othervm -Xbootclasspath/a:. -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-BackgroundCompilation -XX:-UseCompressedOops -XX:+UseParallelGC -XX:CompileOnly=TestMethodUnloading::doWork TestMethodUnloading
+ * @run main/othervm -Xbootclasspath/a:. -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-BackgroundCompilation -XX:-UseCompressedOops -XX:CompileOnly=TestMethodUnloading::doWork TestMethodUnloading
  */
 public class TestMethodUnloading {
     private static final String workerClassName = "WorkerClass";
diff -r a178c2e6f85f -r 7430aa5718a5 test/compiler/rtm/cli/TestUseRTMDeoptOptionOnSupportedConfig.java
--- a/test/compiler/rtm/cli/TestUseRTMDeoptOptionOnSupportedConfig.java	Tue Sep 02 11:42:01 2014 -0700
+++ b/test/compiler/rtm/cli/TestUseRTMDeoptOptionOnSupportedConfig.java	Wed Sep 03 08:52:08 2014 -0700
@@ -62,13 +62,16 @@
         // verify default value
         CommandLineOptionTest.verifyOptionValueForSameVM("UseRTMDeopt",
                 TestUseRTMDeoptOptionOnSupportedConfig.DEFAULT_VALUE,
+                CommandLineOptionTest.UNLOCK_EXPERIMENTAL_VM_OPTIONS,
                 "-XX:+UseRTMLocking");
         // verify that option is off when UseRTMLocking is off
-        CommandLineOptionTest.verifyOptionValueForSameVM("UseRTMDeopt",
-                "false", "-XX:-UseRTMLocking", "-XX:+UseRTMDeopt");
+        CommandLineOptionTest.verifyOptionValueForSameVM("UseRTMDeopt", "false",
+                CommandLineOptionTest.UNLOCK_EXPERIMENTAL_VM_OPTIONS,
+                "-XX:-UseRTMLocking", "-XX:+UseRTMDeopt");
         // verify that option could be turned on
-        CommandLineOptionTest.verifyOptionValueForSameVM("UseRTMDeopt",
-                "true", "-XX:+UseRTMLocking", "-XX:+UseRTMDeopt");
+        CommandLineOptionTest.verifyOptionValueForSameVM("UseRTMDeopt", "true",
+                CommandLineOptionTest.UNLOCK_EXPERIMENTAL_VM_OPTIONS,
+                "-XX:+UseRTMLocking", "-XX:+UseRTMDeopt");
     }
 
     public static void main(String args[]) throws Throwable {
diff -r a178c2e6f85f -r 7430aa5718a5 test/compiler/rtm/cli/TestUseRTMLockingOptionOnSupportedConfig.java
--- a/test/compiler/rtm/cli/TestUseRTMLockingOptionOnSupportedConfig.java	Tue Sep 02 11:42:01 2014 -0700
+++ b/test/compiler/rtm/cli/TestUseRTMLockingOptionOnSupportedConfig.java	Wed Sep 03 08:52:08 2014 -0700
@@ -58,24 +58,31 @@
                 new String[]{
                         RTMGenericCommandLineOptionTest.RTM_INSTR_ERROR,
                         unrecongnizedOption
-                }, ExitCode.OK, "-XX:+UseRTMLocking"
+                }, ExitCode.OK,
+                CommandLineOptionTest.UNLOCK_EXPERIMENTAL_VM_OPTIONS,
+                "-XX:+UseRTMLocking"
         );
 
         CommandLineOptionTest.verifySameJVMStartup(null,
                 new String[]{
                         RTMGenericCommandLineOptionTest.RTM_INSTR_ERROR,
                         unrecongnizedOption
-                }, ExitCode.OK, "-XX:-UseRTMLocking"
+                }, ExitCode.OK,
+                CommandLineOptionTest.UNLOCK_EXPERIMENTAL_VM_OPTIONS,
+                "-XX:-UseRTMLocking"
         );
         // verify that UseRTMLocking is of by default
         CommandLineOptionTest.verifyOptionValueForSameVM("UseRTMLocking",
-                TestUseRTMLockingOptionOnSupportedConfig.DEFAULT_VALUE);
+                TestUseRTMLockingOptionOnSupportedConfig.DEFAULT_VALUE,
+                CommandLineOptionTest.UNLOCK_EXPERIMENTAL_VM_OPTIONS);
         // verify that we can change UseRTMLocking value
         CommandLineOptionTest.verifyOptionValueForSameVM("UseRTMLocking",
                 TestUseRTMLockingOptionOnSupportedConfig.DEFAULT_VALUE,
+                CommandLineOptionTest.UNLOCK_EXPERIMENTAL_VM_OPTIONS,
                 "-XX:-UseRTMLocking");
         CommandLineOptionTest.verifyOptionValueForSameVM("UseRTMLocking",
-                "true", "-XX:+UseRTMLocking");
+                "true", CommandLineOptionTest.UNLOCK_EXPERIMENTAL_VM_OPTIONS,
+                "-XX:+UseRTMLocking");
     }
 
     public static void main(String args[]) throws Throwable {
diff -r a178c2e6f85f -r 7430aa5718a5 test/compiler/rtm/cli/TestUseRTMLockingOptionWithBiasedLocking.java
--- a/test/compiler/rtm/cli/TestUseRTMLockingOptionWithBiasedLocking.java	Tue Sep 02 11:42:01 2014 -0700
+++ b/test/compiler/rtm/cli/TestUseRTMLockingOptionWithBiasedLocking.java	Wed Sep 03 08:52:08 2014 -0700
@@ -53,18 +53,22 @@
         // verify that we will not get a warning
         CommandLineOptionTest.verifySameJVMStartup(null,
                 new String[] { warningMessage }, ExitCode.OK,
+                CommandLineOptionTest.UNLOCK_EXPERIMENTAL_VM_OPTIONS,
                 "-XX:+UseRTMLocking", "-XX:-UseBiasedLocking");
         // verify that we will get a warning
         CommandLineOptionTest.verifySameJVMStartup(
                 new String[] { warningMessage }, null, ExitCode.OK,
+                CommandLineOptionTest.UNLOCK_EXPERIMENTAL_VM_OPTIONS,
                 "-XX:+UseRTMLocking", "-XX:+UseBiasedLocking");
         // verify that UseBiasedLocking is false when we use rtm locking
         CommandLineOptionTest.verifyOptionValueForSameVM("UseBiasedLocking",
-                "false", "-XX:+UseRTMLocking");
+                "false", CommandLineOptionTest.UNLOCK_EXPERIMENTAL_VM_OPTIONS,
+                "-XX:+UseRTMLocking");
         // verify that we can't turn on biased locking when
         // using rtm locking
         CommandLineOptionTest.verifyOptionValueForSameVM("UseBiasedLocking",
-                "false", "-XX:+UseRTMLocking", "-XX:+UseBiasedLocking");
+                "false", CommandLineOptionTest.UNLOCK_EXPERIMENTAL_VM_OPTIONS,
+                "-XX:+UseRTMLocking", "-XX:+UseBiasedLocking");
     }
 
     public static void main(String args[]) throws Throwable {
diff -r a178c2e6f85f -r 7430aa5718a5 test/gc/g1/TestHumongousShrinkHeap.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/gc/g1/TestHumongousShrinkHeap.java	Wed Sep 03 08:52:08 2014 -0700
@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * @test TestHumongousShrinkHeap
+ * @bug 8036025 8056043
+ * @summary Verify that heap shrinks after GC in the presence of fragmentation due to humongous objects
+ * @library /testlibrary
+ * @run main/othervm -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=50 -XX:+UseG1GC -XX:G1HeapRegionSize=1M -verbose:gc TestHumongousShrinkHeap
+ */
+
+import java.lang.management.ManagementFactory;
+import java.lang.management.MemoryUsage;
+import java.util.ArrayList;
+import java.util.List;
+import sun.management.ManagementFactoryHelper;
+import static com.oracle.java.testlibrary.Asserts.*;
+
+public class TestHumongousShrinkHeap {
+
+    public static final String MIN_FREE_RATIO_FLAG_NAME = "MinHeapFreeRatio";
+    public static final String MAX_FREE_RATIO_FLAG_NAME = "MaxHeapFreeRatio";
+
+    private static final ArrayList<ArrayList<byte[]>> garbage = new ArrayList<>();
+    private static final int PAGE_SIZE = 1024 * 1024; // 1M
+    private static final int PAGES_NUM = 5;
+
+
+    public static void main(String[] args) {
+        new TestHumongousShrinkHeap().test();
+    }
+
+    private final void test() {
+        System.gc();
+        MemoryUsagePrinter.printMemoryUsage("init");
+
+        eat();
+        MemoryUsagePrinter.printMemoryUsage("eaten");
+        MemoryUsage muFull = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
+
+        free();
+        MemoryUsagePrinter.printMemoryUsage("free");
+        MemoryUsage muFree = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
+
+        assertLessThan(muFree.getCommitted(), muFull.getCommitted(), String.format(
+                "committed free heap size is not less than committed full heap size, heap hasn't been shrunk?%n"
+                + "%s = %s%n%s = %s",
+                MIN_FREE_RATIO_FLAG_NAME,
+                ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MIN_FREE_RATIO_FLAG_NAME).getValue(),
+                MAX_FREE_RATIO_FLAG_NAME,
+                ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MAX_FREE_RATIO_FLAG_NAME).getValue()
+        ));
+    }
+
+    private void eat() {
+        int HumongousObjectSize = Math.round(.9f * PAGE_SIZE);
+        System.out.println("Will allocate objects of size=" +
+                MemoryUsagePrinter.humanReadableByteCount(HumongousObjectSize, true));
+
+        for (int i = 0; i < PAGES_NUM; i++) {
+            ArrayList<byte[]> stuff = new ArrayList<>();
+            eatList(stuff, 100, HumongousObjectSize);
+            MemoryUsagePrinter.printMemoryUsage("eat #" + i);
+            garbage.add(stuff);
+        }
+    }
+
+    private void free() {
+        // do not free last one list
+        garbage.subList(0, garbage.size() - 1).clear();
+
+        // do not free last one element from last list
+        ArrayList stuff = garbage.get(garbage.size() - 1);
+        stuff.subList(0, stuff.size() - 1).clear();
+        System.gc();
+    }
+
+    private static void eatList(List garbage, int count, int size) {
+        for (int i = 0; i < count; i++) {
+            garbage.add(new byte[size]);
+        }
+    }
+}
+
+/**
+ * Prints memory usage to standard output
+ */
+class MemoryUsagePrinter {
+
+    public static String humanReadableByteCount(long bytes, boolean si) {
+        int unit = si ? 1000 : 1024;
+        if (bytes < unit) {
+            return bytes + " B";
+        }
+        int exp = (int) (Math.log(bytes) / Math.log(unit));
+        String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1) + (si ? "" : "i");
+        return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
+    }
+
+    public static void printMemoryUsage(String label) {
+        MemoryUsage memusage = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
+        float freeratio = 1f - (float) memusage.getUsed() / memusage.getCommitted();
+        System.out.format("[%-24s] init: %-7s, used: %-7s, comm: %-7s, freeRatio ~= %.1f%%%n",
+                label,
+                humanReadableByteCount(memusage.getInit(), true),
+                humanReadableByteCount(memusage.getUsed(), true),
+                humanReadableByteCount(memusage.getCommitted(), true),
+                freeratio * 100
+        );
+    }
+}
diff -r a178c2e6f85f -r 7430aa5718a5 test/testlibrary/com/oracle/java/testlibrary/BuildHelper.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/testlibrary/com/oracle/java/testlibrary/BuildHelper.java	Wed Sep 03 08:52:08 2014 -0700
@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package com.oracle.java.testlibrary;
+
+import java.io.File;
+import java.io.FileReader;
+import java.util.Properties;
+
+public class BuildHelper {
+
+    /**
+     * Commercial builds should have the BUILD_TYPE set to commercial
+     * within the release file, found at the root of the JDK.
+     */
+    public static boolean isCommercialBuild() throws Exception {
+        String buildType = getReleaseProperty("BUILD_TYPE","notFound");
+        return buildType.equals("commercial");
+    }
+
+
+    /**
+     * Return the value for property key, or defaultValue if no property not found.
+     * If present, double quotes are trimmed.
+     */
+    public static String getReleaseProperty(String key, String defaultValue) throws Exception {
+        Properties properties = getReleaseProperties();
+        String value = properties.getProperty(key, defaultValue);
+        return trimDoubleQuotes(value);
+    }
+
+    /**
+     * Return the value for property key, or null if no property not found.
+     * If present, double quotes are trimmed.
+     */
+    public static String getReleaseProperty(String key) throws Exception {
+        return getReleaseProperty(key, null);
+    }
+
+    /**
+     * Get properties from the release file
+     */
+    public static Properties getReleaseProperties() throws Exception {
+        Properties properties = new Properties();
+        properties.load(new FileReader(getReleaseFile()));
+        return properties;
+    }
+
+    /**
+     * Every JDK has a release file in its root.
+     * @return A handler to the release file.
+     */
+    public static File getReleaseFile() throws Exception {
+        String jdkPath = getJDKRoot();
+        File releaseFile = new File(jdkPath,"release");
+        if ( ! releaseFile.canRead() ) {
+            throw new Exception("Release file is not readable, or it is absent: " +
+                    releaseFile.getCanonicalPath());
+        }
+        return releaseFile;
+    }
+
+    /**
+     * Returns path to the JDK under test.
+     * This path is obtained through the test.jdk property, usually set by JTREG.
+     */
+    public static String getJDKRoot() {
+        String jdkPath = System.getProperty("test.jdk");
+        if (jdkPath == null) {
+            throw new RuntimeException("System property 'test.jdk' not set. This property is normally set by jtreg. "
+                    + "When running test separately, set this property using '-Dtest.jdk=/path/to/jdk'.");
+        }
+        return jdkPath;
+    }
+
+    /**
+     * Trim double quotes from the beginning and the end of the given string.
+     * @param original string to trim.
+     * @return a new trimmed string.
+     */
+    public static String trimDoubleQuotes(String original) {
+        if (original == null) { return null; }
+        String trimmed = original.replaceAll("^\"+|\"+$", "");
+        return trimmed;
+    }
+}