# HG changeset patch
# User ccheung
# Date 1382764003 25200
# Node ID b4aa8fc5d0d5eb1b55e6ab6c280d86079a32607d
# Parent  209aa13ab8c0f4a3fda2927c0478e510551f97d7# Parent  0dcdec729cdaa3b46bb3e89fe7c12d1a74b2cbf3
Merge

diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/cpu/sparc/vm/macroAssembler_sparc.cpp
--- a/src/cpu/sparc/vm/macroAssembler_sparc.cpp	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/cpu/sparc/vm/macroAssembler_sparc.cpp	Fri Oct 25 22:06:43 2013 -0700
@@ -4099,15 +4099,19 @@
 
 void MacroAssembler::encode_klass_not_null(Register r) {
   assert (UseCompressedClassPointers, "must be compressed");
-  assert(Universe::narrow_klass_base() != NULL, "narrow_klass_base should be initialized");
-  assert(r != G6_heapbase, "bad register choice");
-  set((intptr_t)Universe::narrow_klass_base(), G6_heapbase);
-  sub(r, G6_heapbase, r);
-  if (Universe::narrow_klass_shift() != 0) {
-    assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong");
-    srlx(r, LogKlassAlignmentInBytes, r);
+  if (Universe::narrow_klass_base() != NULL) {
+    assert(r != G6_heapbase, "bad register choice");
+    set((intptr_t)Universe::narrow_klass_base(), G6_heapbase);
+    sub(r, G6_heapbase, r);
+    if (Universe::narrow_klass_shift() != 0) {
+      assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong");
+      srlx(r, LogKlassAlignmentInBytes, r);
+    }
+    reinit_heapbase();
+  } else {
+    assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift() || Universe::narrow_klass_shift() == 0, "decode alg wrong");
+    srlx(r, Universe::narrow_klass_shift(), r);
   }
-  reinit_heapbase();
 }
 
 void MacroAssembler::encode_klass_not_null(Register src, Register dst) {
@@ -4115,11 +4119,16 @@
     encode_klass_not_null(src);
   } else {
     assert (UseCompressedClassPointers, "must be compressed");
-    assert(Universe::narrow_klass_base() != NULL, "narrow_klass_base should be initialized");
-    set((intptr_t)Universe::narrow_klass_base(), dst);
-    sub(src, dst, dst);
-    if (Universe::narrow_klass_shift() != 0) {
-      srlx(dst, LogKlassAlignmentInBytes, dst);
+    if (Universe::narrow_klass_base() != NULL) {
+      set((intptr_t)Universe::narrow_klass_base(), dst);
+      sub(src, dst, dst);
+      if (Universe::narrow_klass_shift() != 0) {
+        srlx(dst, LogKlassAlignmentInBytes, dst);
+      }
+    } else {
+      // shift src into dst
+      assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift() || Universe::narrow_klass_shift() == 0, "decode alg wrong");
+      srlx(src, Universe::narrow_klass_shift(), dst);
     }
   }
 }
@@ -4129,14 +4138,16 @@
 // the instructions they generate change, then this method needs to be updated.
 int MacroAssembler::instr_size_for_decode_klass_not_null() {
   assert (UseCompressedClassPointers, "only for compressed klass ptrs");
-  // set + add + set
-  int num_instrs = insts_for_internal_set((intptr_t)Universe::narrow_klass_base()) + 1 +
-    insts_for_internal_set((intptr_t)Universe::narrow_ptrs_base());
-  if (Universe::narrow_klass_shift() == 0) {
-    return num_instrs * BytesPerInstWord;
-  } else { // sllx
-    return (num_instrs + 1) * BytesPerInstWord;
+  int num_instrs = 1;  // shift src,dst or add
+  if (Universe::narrow_klass_base() != NULL) {
+    // set + add + set
+    num_instrs += insts_for_internal_set((intptr_t)Universe::narrow_klass_base()) +
+                  insts_for_internal_set((intptr_t)Universe::narrow_ptrs_base());
+    if (Universe::narrow_klass_shift() != 0) {
+      num_instrs += 1;  // sllx
+    }
   }
+  return num_instrs * BytesPerInstWord;
 }
 
 // !!! If the instructions that get generated here change then function
@@ -4145,13 +4156,17 @@
   // Do not add assert code to this unless you change vtableStubs_sparc.cpp
   // pd_code_size_limit.
   assert (UseCompressedClassPointers, "must be compressed");
-  assert(Universe::narrow_klass_base() != NULL, "narrow_klass_base should be initialized");
-  assert(r != G6_heapbase, "bad register choice");
-  set((intptr_t)Universe::narrow_klass_base(), G6_heapbase);
-  if (Universe::narrow_klass_shift() != 0)
-    sllx(r, LogKlassAlignmentInBytes, r);
-  add(r, G6_heapbase, r);
-  reinit_heapbase();
+  if (Universe::narrow_klass_base() != NULL) {
+    assert(r != G6_heapbase, "bad register choice");
+    set((intptr_t)Universe::narrow_klass_base(), G6_heapbase);
+    if (Universe::narrow_klass_shift() != 0)
+      sllx(r, LogKlassAlignmentInBytes, r);
+    add(r, G6_heapbase, r);
+    reinit_heapbase();
+  } else {
+    assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift() || Universe::narrow_klass_shift() == 0, "decode alg wrong");
+    sllx(r, Universe::narrow_klass_shift(), r);
+  }
 }
 
 void  MacroAssembler::decode_klass_not_null(Register src, Register dst) {
@@ -4161,16 +4176,21 @@
     // Do not add assert code to this unless you change vtableStubs_sparc.cpp
     // pd_code_size_limit.
     assert (UseCompressedClassPointers, "must be compressed");
-    assert(Universe::narrow_klass_base() != NULL, "narrow_klass_base should be initialized");
-    if (Universe::narrow_klass_shift() != 0) {
-      assert((src != G6_heapbase) && (dst != G6_heapbase), "bad register choice");
-      set((intptr_t)Universe::narrow_klass_base(), G6_heapbase);
-      sllx(src, LogKlassAlignmentInBytes, dst);
-      add(dst, G6_heapbase, dst);
-      reinit_heapbase();
+    if (Universe::narrow_klass_base() != NULL) {
+      if (Universe::narrow_klass_shift() != 0) {
+        assert((src != G6_heapbase) && (dst != G6_heapbase), "bad register choice");
+        set((intptr_t)Universe::narrow_klass_base(), G6_heapbase);
+        sllx(src, LogKlassAlignmentInBytes, dst);
+        add(dst, G6_heapbase, dst);
+        reinit_heapbase();
+      } else {
+        set((intptr_t)Universe::narrow_klass_base(), dst);
+        add(src, dst, dst);
+      }
     } else {
-      set((intptr_t)Universe::narrow_klass_base(), dst);
-      add(src, dst, dst);
+      // shift/mov src into dst.
+      assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift() || Universe::narrow_klass_shift() == 0, "decode alg wrong");
+      sllx(src, Universe::narrow_klass_shift(), dst);
     }
   }
 }
diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/cpu/sparc/vm/sparc.ad
--- a/src/cpu/sparc/vm/sparc.ad	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/cpu/sparc/vm/sparc.ad	Fri Oct 25 22:06:43 2013 -0700
@@ -1660,12 +1660,16 @@
   if (UseCompressedClassPointers) {
     assert(Universe::heap() != NULL, "java heap should be initialized");
     st->print_cr("\tLDUW   [R_O0 + oopDesc::klass_offset_in_bytes],R_G5\t! Inline cache check - compressed klass");
-    st->print_cr("\tSET    Universe::narrow_klass_base,R_G6_heap_base");
-    if (Universe::narrow_klass_shift() != 0) {
-      st->print_cr("\tSLL    R_G5,3,R_G5");
+    if (Universe::narrow_klass_base() != 0) {
+      st->print_cr("\tSET    Universe::narrow_klass_base,R_G6_heap_base");
+      if (Universe::narrow_klass_shift() != 0) {
+        st->print_cr("\tSLL    R_G5,Universe::narrow_klass_shift,R_G5");
+      }
+      st->print_cr("\tADD    R_G5,R_G6_heap_base,R_G5");
+      st->print_cr("\tSET    Universe::narrow_ptrs_base,R_G6_heap_base");
+    } else {
+      st->print_cr("\tSLL    R_G5,Universe::narrow_klass_shift,R_G5");
     }
-    st->print_cr("\tADD    R_G5,R_G6_heap_base,R_G5");
-    st->print_cr("\tSET    Universe::narrow_ptrs_base,R_G6_heap_base");
   } else {
     st->print_cr("\tLDX    [R_O0 + oopDesc::klass_offset_in_bytes],R_G5\t! Inline cache check");
   }
diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/cpu/x86/vm/macroAssembler_x86.cpp
--- a/src/cpu/x86/vm/macroAssembler_x86.cpp	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/cpu/x86/vm/macroAssembler_x86.cpp	Fri Oct 25 22:06:43 2013 -0700
@@ -5049,25 +5049,32 @@
 }
 
 void MacroAssembler::encode_klass_not_null(Register r) {
-  assert(Universe::narrow_klass_base() != NULL, "Base should be initialized");
-  // Use r12 as a scratch register in which to temporarily load the narrow_klass_base.
-  assert(r != r12_heapbase, "Encoding a klass in r12");
-  mov64(r12_heapbase, (int64_t)Universe::narrow_klass_base());
-  subq(r, r12_heapbase);
+  if (Universe::narrow_klass_base() != NULL) {
+    // Use r12 as a scratch register in which to temporarily load the narrow_klass_base.
+    assert(r != r12_heapbase, "Encoding a klass in r12");
+    mov64(r12_heapbase, (int64_t)Universe::narrow_klass_base());
+    subq(r, r12_heapbase);
+  }
   if (Universe::narrow_klass_shift() != 0) {
     assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong");
     shrq(r, LogKlassAlignmentInBytes);
   }
-  reinit_heapbase();
+  if (Universe::narrow_klass_base() != NULL) {
+    reinit_heapbase();
+  }
 }
 
 void MacroAssembler::encode_klass_not_null(Register dst, Register src) {
   if (dst == src) {
     encode_klass_not_null(src);
   } else {
-    mov64(dst, (int64_t)Universe::narrow_klass_base());
-    negq(dst);
-    addq(dst, src);
+    if (Universe::narrow_klass_base() != NULL) {
+      mov64(dst, (int64_t)Universe::narrow_klass_base());
+      negq(dst);
+      addq(dst, src);
+    } else {
+      movptr(dst, src);
+    }
     if (Universe::narrow_klass_shift() != 0) {
       assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong");
       shrq(dst, LogKlassAlignmentInBytes);
@@ -5081,15 +5088,19 @@
 // generate change, then this method needs to be updated.
 int MacroAssembler::instr_size_for_decode_klass_not_null() {
   assert (UseCompressedClassPointers, "only for compressed klass ptrs");
-  // mov64 + addq + shlq? + mov64  (for reinit_heapbase()).
-  return (Universe::narrow_klass_shift() == 0 ? 20 : 24);
+  if (Universe::narrow_klass_base() != NULL) {
+    // mov64 + addq + shlq? + mov64  (for reinit_heapbase()).
+    return (Universe::narrow_klass_shift() == 0 ? 20 : 24);
+  } else {
+    // longest load decode klass function, mov64, leaq
+    return 16;
+  }
 }
 
 // !!! If the instructions that get generated here change then function
 // instr_size_for_decode_klass_not_null() needs to get updated.
 void  MacroAssembler::decode_klass_not_null(Register r) {
   // Note: it will change flags
-  assert(Universe::narrow_klass_base() != NULL, "Base should be initialized");
   assert (UseCompressedClassPointers, "should only be used for compressed headers");
   assert(r != r12_heapbase, "Decoding a klass in r12");
   // Cannot assert, unverified entry point counts instructions (see .ad file)
@@ -5100,14 +5111,15 @@
     shlq(r, LogKlassAlignmentInBytes);
   }
   // Use r12 as a scratch register in which to temporarily load the narrow_klass_base.
-  mov64(r12_heapbase, (int64_t)Universe::narrow_klass_base());
-  addq(r, r12_heapbase);
-  reinit_heapbase();
+  if (Universe::narrow_klass_base() != NULL) {
+    mov64(r12_heapbase, (int64_t)Universe::narrow_klass_base());
+    addq(r, r12_heapbase);
+    reinit_heapbase();
+  }
 }
 
 void  MacroAssembler::decode_klass_not_null(Register dst, Register src) {
   // Note: it will change flags
-  assert(Universe::narrow_klass_base() != NULL, "Base should be initialized");
   assert (UseCompressedClassPointers, "should only be used for compressed headers");
   if (dst == src) {
     decode_klass_not_null(dst);
@@ -5115,7 +5127,6 @@
     // Cannot assert, unverified entry point counts instructions (see .ad file)
     // vtableStubs also counts instructions in pd_code_size_limit.
     // Also do not verify_oop as this is called by verify_oop.
-
     mov64(dst, (int64_t)Universe::narrow_klass_base());
     if (Universe::narrow_klass_shift() != 0) {
       assert(LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong");
diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/os/bsd/vm/os_bsd.cpp
--- a/src/os/bsd/vm/os_bsd.cpp	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/os/bsd/vm/os_bsd.cpp	Fri Oct 25 22:06:43 2013 -0700
@@ -945,17 +945,15 @@
 // Used by VMSelfDestructTimer and the MemProfiler.
 double os::elapsedTime() {
 
-  return (double)(os::elapsed_counter()) * 0.000001;
+  return ((double)os::elapsed_counter()) / os::elapsed_frequency();
 }
 
 jlong os::elapsed_counter() {
-  timeval time;
-  int status = gettimeofday(&time, NULL);
-  return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
+  return javaTimeNanos() - initial_time_count;
 }
 
 jlong os::elapsed_frequency() {
-  return (1000 * 1000);
+  return NANOSECS_PER_SEC; // nanosecond resolution
 }
 
 bool os::supports_vtime() { return true; }
@@ -3582,7 +3580,7 @@
   Bsd::_main_thread = pthread_self();
 
   Bsd::clock_init();
-  initial_time_count = os::elapsed_counter();
+  initial_time_count = javaTimeNanos();
 
 #ifdef __APPLE__
   // XXXDARWIN
diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/os/linux/vm/os_linux.cpp
--- a/src/os/linux/vm/os_linux.cpp	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/os/linux/vm/os_linux.cpp	Fri Oct 25 22:06:43 2013 -0700
@@ -1333,17 +1333,15 @@
 // Used by VMSelfDestructTimer and the MemProfiler.
 double os::elapsedTime() {
 
-  return (double)(os::elapsed_counter()) * 0.000001;
+  return ((double)os::elapsed_counter()) / os::elapsed_frequency(); // nanosecond resolution
 }
 
 jlong os::elapsed_counter() {
-  timeval time;
-  int status = gettimeofday(&time, NULL);
-  return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
+  return javaTimeNanos() - initial_time_count;
 }
 
 jlong os::elapsed_frequency() {
-  return (1000 * 1000);
+  return NANOSECS_PER_SEC; // nanosecond resolution
 }
 
 bool os::supports_vtime() { return true; }
@@ -4750,7 +4748,7 @@
   Linux::_main_thread = pthread_self();
 
   Linux::clock_init();
-  initial_time_count = os::elapsed_counter();
+  initial_time_count = javaTimeNanos();
 
   // pthread_condattr initialization for monotonic clock
   int status;
diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/os_cpu/bsd_x86/vm/os_bsd_x86.cpp
--- a/src/os_cpu/bsd_x86/vm/os_bsd_x86.cpp	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/os_cpu/bsd_x86/vm/os_bsd_x86.cpp	Fri Oct 25 22:06:43 2013 -0700
@@ -79,6 +79,15 @@
 # include <pthread_np.h>
 #endif
 
+// needed by current_stack_region() workaround for Mavericks
+#if defined(__APPLE__)
+# include <errno.h>
+# include <sys/types.h>
+# include <sys/sysctl.h>
+# define DEFAULT_MAIN_THREAD_STACK_PAGES 2048
+# define OS_X_10_9_0_KERNEL_MAJOR_VERSION 13
+#endif
+
 #ifdef AMD64
 #define SPELL_REG_SP "rsp"
 #define SPELL_REG_FP "rbp"
@@ -828,6 +837,21 @@
   pthread_t self = pthread_self();
   void *stacktop = pthread_get_stackaddr_np(self);
   *size = pthread_get_stacksize_np(self);
+  // workaround for OS X 10.9.0 (Mavericks)
+  // pthread_get_stacksize_np returns 128 pages even though the actual size is 2048 pages
+  if (pthread_main_np() == 1) {
+    if ((*size) < (DEFAULT_MAIN_THREAD_STACK_PAGES * (size_t)getpagesize())) {
+      char kern_osrelease[256];
+      size_t kern_osrelease_size = sizeof(kern_osrelease);
+      int ret = sysctlbyname("kern.osrelease", kern_osrelease, &kern_osrelease_size, NULL, 0);
+      if (ret == 0) {
+        // get the major number, atoi will ignore the minor amd micro portions of the version string
+        if (atoi(kern_osrelease) >= OS_X_10_9_0_KERNEL_MAJOR_VERSION) {
+          *size = (DEFAULT_MAIN_THREAD_STACK_PAGES*getpagesize());
+        }
+      }
+    }
+  }
   *bottom = (address) stacktop - *size;
 #elif defined(__OpenBSD__)
   stack_t ss;
diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/share/vm/classfile/classLoaderData.cpp
--- a/src/share/vm/classfile/classLoaderData.cpp	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/share/vm/classfile/classLoaderData.cpp	Fri Oct 25 22:06:43 2013 -0700
@@ -131,6 +131,17 @@
   }
 }
 
+void ClassLoaderData::loaded_classes_do(KlassClosure* klass_closure) {
+  // Lock to avoid classes being modified/added/removed during iteration
+  MutexLockerEx ml(metaspace_lock(),  Mutex::_no_safepoint_check_flag);
+  for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
+    // Do not filter ArrayKlass oops here...
+    if (k->oop_is_array() || (k->oop_is_instance() && InstanceKlass::cast(k)->is_loaded())) {
+      klass_closure->do_klass(k);
+    }
+  }
+}
+
 void ClassLoaderData::classes_do(void f(InstanceKlass*)) {
   for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
     if (k->oop_is_instance()) {
@@ -600,6 +611,12 @@
   }
 }
 
+void ClassLoaderDataGraph::loaded_classes_do(KlassClosure* klass_closure) {
+  for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
+    cld->loaded_classes_do(klass_closure);
+  }
+}
+
 void ClassLoaderDataGraph::classes_unloading_do(void f(Klass* const)) {
   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!");
   for (ClassLoaderData* cld = _unloading; cld != NULL; cld = cld->next()) {
diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/share/vm/classfile/classLoaderData.hpp
--- a/src/share/vm/classfile/classLoaderData.hpp	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/share/vm/classfile/classLoaderData.hpp	Fri Oct 25 22:06:43 2013 -0700
@@ -78,6 +78,7 @@
   static void keep_alive_oops_do(OopClosure* blk, KlassClosure* klass_closure, bool must_claim);
   static void classes_do(KlassClosure* klass_closure);
   static void classes_do(void f(Klass* const));
+  static void loaded_classes_do(KlassClosure* klass_closure);
   static void classes_unloading_do(void f(Klass* const));
   static bool do_unloading(BoolObjectClosure* is_alive);
 
@@ -186,6 +187,7 @@
   bool keep_alive() const       { return _keep_alive; }
   bool is_alive(BoolObjectClosure* is_alive_closure) const;
   void classes_do(void f(Klass*));
+  void loaded_classes_do(KlassClosure* klass_closure);
   void classes_do(void f(InstanceKlass*));
 
   // Deallocate free list during class unloading.
diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/share/vm/memory/metaspace.cpp
--- a/src/share/vm/memory/metaspace.cpp	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/share/vm/memory/metaspace.cpp	Fri Oct 25 22:06:43 2013 -0700
@@ -56,7 +56,7 @@
 
 MetaWord* last_allocated = 0;
 
-size_t Metaspace::_class_metaspace_size;
+size_t Metaspace::_compressed_class_space_size;
 
 // Used in declarations in SpaceManager and ChunkManager
 enum ChunkIndex {
@@ -2843,6 +2843,8 @@
 #define VIRTUALSPACEMULTIPLIER 2
 
 #ifdef _LP64
+static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
+
 void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) {
   // Figure out the narrow_klass_base and the narrow_klass_shift.  The
   // narrow_klass_base is the lower of the metaspace base and the cds base
@@ -2852,14 +2854,22 @@
   address higher_address;
   if (UseSharedSpaces) {
     higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()),
-                          (address)(metaspace_base + class_metaspace_size()));
+                          (address)(metaspace_base + compressed_class_space_size()));
     lower_base = MIN2(metaspace_base, cds_base);
   } else {
-    higher_address = metaspace_base + class_metaspace_size();
+    higher_address = metaspace_base + compressed_class_space_size();
     lower_base = metaspace_base;
+
+    uint64_t klass_encoding_max = UnscaledClassSpaceMax << LogKlassAlignmentInBytes;
+    // If compressed class space fits in lower 32G, we don't need a base.
+    if (higher_address <= (address)klass_encoding_max) {
+      lower_base = 0; // effectively lower base is zero.
+    }
   }
+
   Universe::set_narrow_klass_base(lower_base);
-  if ((uint64_t)(higher_address - lower_base) < (uint64_t)max_juint) {
+
+  if ((uint64_t)(higher_address - lower_base) < UnscaledClassSpaceMax) {
     Universe::set_narrow_klass_shift(0);
   } else {
     assert(!UseSharedSpaces, "Cannot shift with UseSharedSpaces");
@@ -2874,24 +2884,24 @@
   assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
   address lower_base = MIN2((address)metaspace_base, cds_base);
   address higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()),
-                                (address)(metaspace_base + class_metaspace_size()));
-  return ((uint64_t)(higher_address - lower_base) < (uint64_t)max_juint);
+                                (address)(metaspace_base + compressed_class_space_size()));
+  return ((uint64_t)(higher_address - lower_base) < UnscaledClassSpaceMax);
 }
 
 // Try to allocate the metaspace at the requested addr.
 void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) {
   assert(using_class_space(), "called improperly");
   assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
-  assert(class_metaspace_size() < KlassEncodingMetaspaceMax,
+  assert(compressed_class_space_size() < KlassEncodingMetaspaceMax,
          "Metaspace size is too big");
-  assert_is_ptr_aligned(requested_addr,          _reserve_alignment);
-  assert_is_ptr_aligned(cds_base,                _reserve_alignment);
-  assert_is_size_aligned(class_metaspace_size(), _reserve_alignment);
+  assert_is_ptr_aligned(requested_addr, _reserve_alignment);
+  assert_is_ptr_aligned(cds_base, _reserve_alignment);
+  assert_is_size_aligned(compressed_class_space_size(), _reserve_alignment);
 
   // Don't use large pages for the class space.
   bool large_pages = false;
 
-  ReservedSpace metaspace_rs = ReservedSpace(class_metaspace_size(),
+  ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(),
                                              _reserve_alignment,
                                              large_pages,
                                              requested_addr, 0);
@@ -2906,7 +2916,7 @@
       while (!metaspace_rs.is_reserved() && (addr + increment > addr) &&
              can_use_cds_with_metaspace_addr(addr + increment, cds_base)) {
         addr = addr + increment;
-        metaspace_rs = ReservedSpace(class_metaspace_size(),
+        metaspace_rs = ReservedSpace(compressed_class_space_size(),
                                      _reserve_alignment, large_pages, addr, 0);
       }
     }
@@ -2917,11 +2927,11 @@
     // initialization has happened that depends on UseCompressedClassPointers.
     // So, UseCompressedClassPointers cannot be turned off at this point.
     if (!metaspace_rs.is_reserved()) {
-      metaspace_rs = ReservedSpace(class_metaspace_size(),
+      metaspace_rs = ReservedSpace(compressed_class_space_size(),
                                    _reserve_alignment, large_pages);
       if (!metaspace_rs.is_reserved()) {
         vm_exit_during_initialization(err_msg("Could not allocate metaspace: %d bytes",
-                                              class_metaspace_size()));
+                                              compressed_class_space_size()));
       }
     }
   }
@@ -2943,8 +2953,8 @@
   if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
     gclog_or_tty->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: " SIZE_FORMAT,
                             Universe::narrow_klass_base(), Universe::narrow_klass_shift());
-    gclog_or_tty->print_cr("Metaspace Size: " SIZE_FORMAT " Address: " PTR_FORMAT " Req Addr: " PTR_FORMAT,
-                           class_metaspace_size(), metaspace_rs.base(), requested_addr);
+    gclog_or_tty->print_cr("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT " Req Addr: " PTR_FORMAT,
+                           compressed_class_space_size(), metaspace_rs.base(), requested_addr);
   }
 }
 
@@ -3010,7 +3020,7 @@
   MaxMetaspaceExpansion = restricted_align_down(MaxMetaspaceExpansion, _commit_alignment);
 
   CompressedClassSpaceSize = restricted_align_down(CompressedClassSpaceSize, _reserve_alignment);
-  set_class_metaspace_size(CompressedClassSpaceSize);
+  set_compressed_class_space_size(CompressedClassSpaceSize);
 }
 
 void Metaspace::global_initialize() {
@@ -3039,12 +3049,12 @@
     }
 
 #ifdef _LP64
-    if (cds_total + class_metaspace_size() > (uint64_t)max_juint) {
+    if (cds_total + compressed_class_space_size() > UnscaledClassSpaceMax) {
       vm_exit_during_initialization("Unable to dump shared archive.",
           err_msg("Size of archive (" SIZE_FORMAT ") + compressed class space ("
                   SIZE_FORMAT ") == total (" SIZE_FORMAT ") is larger than compressed "
-                  "klass limit: " SIZE_FORMAT, cds_total, class_metaspace_size(),
-                  cds_total + class_metaspace_size(), (size_t)max_juint));
+                  "klass limit: " SIZE_FORMAT, cds_total, compressed_class_space_size(),
+                  cds_total + compressed_class_space_size(), UnscaledClassSpaceMax));
     }
 
     // Set the compressed klass pointer base so that decoding of these pointers works
@@ -3092,7 +3102,8 @@
         cds_end = (char *)align_ptr_up(cds_end, _reserve_alignment);
         allocate_metaspace_compressed_klass_ptrs(cds_end, cds_address);
       } else {
-        allocate_metaspace_compressed_klass_ptrs((char *)CompressedKlassPointersBase, 0);
+        char* base = (char*)align_ptr_up(Universe::heap()->reserved_region().end(), _reserve_alignment);
+        allocate_metaspace_compressed_klass_ptrs(base, 0);
       }
     }
 #endif
@@ -3354,6 +3365,11 @@
   return result;
 }
 
+size_t Metaspace::class_chunk_size(size_t word_size) {
+  assert(using_class_space(), "Has to use class space");
+  return class_vsm()->calc_chunk_size(word_size);
+}
+
 void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetadataType mdtype, TRAPS) {
   // If result is still null, we are out of memory.
   if (Verbose && TraceMetadataChunkAllocation) {
@@ -3365,9 +3381,19 @@
     MetaspaceAux::dump(gclog_or_tty);
   }
 
+  bool out_of_compressed_class_space = false;
+  if (is_class_space_allocation(mdtype)) {
+    Metaspace* metaspace = loader_data->metaspace_non_null();
+    out_of_compressed_class_space =
+      MetaspaceAux::committed_bytes(Metaspace::ClassType) +
+      (metaspace->class_chunk_size(word_size) * BytesPerWord) >
+      CompressedClassSpaceSize;
+  }
+
   // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
-  const char* space_string = is_class_space_allocation(mdtype) ? "Compressed class space" :
-                                                                 "Metadata space";
+  const char* space_string = out_of_compressed_class_space ?
+    "Compressed class space" : "Metaspace";
+
   report_java_out_of_memory(space_string);
 
   if (JvmtiExport::should_post_resource_exhausted()) {
@@ -3380,7 +3406,7 @@
     vm_exit_during_initialization("OutOfMemoryError", space_string);
   }
 
-  if (is_class_space_allocation(mdtype)) {
+  if (out_of_compressed_class_space) {
     THROW_OOP(Universe::out_of_memory_error_class_metaspace());
   } else {
     THROW_OOP(Universe::out_of_memory_error_metaspace());
diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/share/vm/memory/metaspace.hpp
--- a/src/share/vm/memory/metaspace.hpp	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/share/vm/memory/metaspace.hpp	Fri Oct 25 22:06:43 2013 -0700
@@ -115,13 +115,13 @@
   static size_t align_word_size_up(size_t);
 
   // Aligned size of the metaspace.
-  static size_t _class_metaspace_size;
+  static size_t _compressed_class_space_size;
 
-  static size_t class_metaspace_size() {
-    return _class_metaspace_size;
+  static size_t compressed_class_space_size() {
+    return _compressed_class_space_size;
   }
-  static void set_class_metaspace_size(size_t metaspace_size) {
-    _class_metaspace_size = metaspace_size;
+  static void set_compressed_class_space_size(size_t size) {
+    _compressed_class_space_size = size;
   }
 
   static size_t _first_chunk_word_size;
@@ -192,6 +192,8 @@
   AllocRecord * _alloc_record_head;
   AllocRecord * _alloc_record_tail;
 
+  size_t class_chunk_size(size_t word_size);
+
  public:
 
   Metaspace(Mutex* lock, MetaspaceType type);
@@ -252,6 +254,7 @@
   static bool is_class_space_allocation(MetadataType mdType) {
     return mdType == ClassType && using_class_space();
   }
+
 };
 
 class MetaspaceAux : AllStatic {
diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/share/vm/memory/universe.cpp
--- a/src/share/vm/memory/universe.cpp	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/share/vm/memory/universe.cpp	Fri Oct 25 22:06:43 2013 -0700
@@ -677,13 +677,13 @@
 // HeapBased - Use compressed oops with heap base + encoding.
 
 // 4Gb
-static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1);
+static const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1);
 // 32Gb
-// OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes;
+// OopEncodingHeapMax == UnscaledOopHeapMax << LogMinObjAlignmentInBytes;
 
 char* Universe::preferred_heap_base(size_t heap_size, size_t alignment, NARROW_OOP_MODE mode) {
   assert(is_size_aligned((size_t)OopEncodingHeapMax, alignment), "Must be");
-  assert(is_size_aligned((size_t)NarrowOopHeapMax, alignment), "Must be");
+  assert(is_size_aligned((size_t)UnscaledOopHeapMax, alignment), "Must be");
   assert(is_size_aligned(heap_size, alignment), "Must be");
 
   uintx heap_base_min_address_aligned = align_size_up(HeapBaseMinAddress, alignment);
@@ -702,20 +702,40 @@
     // If the total size is small enough to allow UnscaledNarrowOop then
     // just use UnscaledNarrowOop.
     } else if ((total_size <= OopEncodingHeapMax) && (mode != HeapBasedNarrowOop)) {
-      if ((total_size <= NarrowOopHeapMax) && (mode == UnscaledNarrowOop) &&
+      if ((total_size <= UnscaledOopHeapMax) && (mode == UnscaledNarrowOop) &&
           (Universe::narrow_oop_shift() == 0)) {
         // Use 32-bits oops without encoding and
         // place heap's top on the 4Gb boundary
-        base = (NarrowOopHeapMax - heap_size);
+        base = (UnscaledOopHeapMax - heap_size);
       } else {
         // Can't reserve with NarrowOopShift == 0
         Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
+
         if (mode == UnscaledNarrowOop ||
-            mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) {
+            mode == ZeroBasedNarrowOop && total_size <= UnscaledOopHeapMax) {
+
           // Use zero based compressed oops with encoding and
           // place heap's top on the 32Gb boundary in case
           // total_size > 4Gb or failed to reserve below 4Gb.
-          base = (OopEncodingHeapMax - heap_size);
+          uint64_t heap_top = OopEncodingHeapMax;
+
+          // For small heaps, save some space for compressed class pointer
+          // space so it can be decoded with no base.
+          if (UseCompressedClassPointers && !UseSharedSpaces &&
+              OopEncodingHeapMax <= 32*G) {
+
+            uint64_t class_space = align_size_up(CompressedClassSpaceSize, alignment);
+            assert(is_size_aligned((size_t)OopEncodingHeapMax-class_space,
+                   alignment), "difference must be aligned too");
+            uint64_t new_top = OopEncodingHeapMax-class_space;
+
+            if (total_size <= new_top) {
+              heap_top = new_top;
+            }
+          }
+
+          // Align base to the adjusted top of the heap
+          base = heap_top - heap_size;
         }
       }
     } else {
@@ -737,7 +757,7 @@
       // Set to a non-NULL value so the ReservedSpace ctor computes
       // the correct no-access prefix.
       // The final value will be set in initialize_heap() below.
-      Universe::set_narrow_oop_base((address)NarrowOopHeapMax);
+      Universe::set_narrow_oop_base((address)UnscaledOopHeapMax);
 #ifdef _WIN64
       if (UseLargePages) {
         // Cannot allocate guard pages for implicit checks in indexed
@@ -833,7 +853,7 @@
         Universe::set_narrow_oop_use_implicit_null_checks(true);
       }
 #endif //  _WIN64
-      if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) {
+      if((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
         // Can't reserve heap below 4Gb.
         Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
       } else {
@@ -1029,7 +1049,7 @@
     Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
     java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
 
-    msg = java_lang_String::create_from_str("Metadata space", CHECK_false);
+    msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
     java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
     msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
     java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/share/vm/oops/instanceKlass.cpp
--- a/src/share/vm/oops/instanceKlass.cpp	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/share/vm/oops/instanceKlass.cpp	Fri Oct 25 22:06:43 2013 -0700
@@ -2393,15 +2393,38 @@
 
 
 const char* InstanceKlass::signature_name() const {
+  int hash_len = 0;
+  char hash_buf[40];
+
+  // If this is an anonymous class, append a hash to make the name unique
+  if (is_anonymous()) {
+    assert(EnableInvokeDynamic, "EnableInvokeDynamic was not set.");
+    intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
+    sprintf(hash_buf, "/" UINTX_FORMAT, (uintx)hash);
+    hash_len = (int)strlen(hash_buf);
+  }
+
+  // Get the internal name as a c string
   const char* src = (const char*) (name()->as_C_string());
   const int src_length = (int)strlen(src);
-  char* dest = NEW_RESOURCE_ARRAY(char, src_length + 3);
-  int src_index = 0;
+
+  char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
+
+  // Add L as type indicator
   int dest_index = 0;
   dest[dest_index++] = 'L';
-  while (src_index < src_length) {
+
+  // Add the actual class name
+  for (int src_index = 0; src_index < src_length; ) {
     dest[dest_index++] = src[src_index++];
   }
+
+  // If we have a hash, append it
+  for (int hash_index = 0; hash_index < hash_len; ) {
+    dest[dest_index++] = hash_buf[hash_index++];
+  }
+
+  // Add the semicolon and the NULL
   dest[dest_index++] = ';';
   dest[dest_index] = '\0';
   return dest;
diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/share/vm/prims/jvmtiGetLoadedClasses.cpp
--- a/src/share/vm/prims/jvmtiGetLoadedClasses.cpp	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/share/vm/prims/jvmtiGetLoadedClasses.cpp	Fri Oct 25 22:06:43 2013 -0700
@@ -29,8 +29,43 @@
 #include "runtime/thread.hpp"
 
 
+// The closure for GetLoadedClasses
+class LoadedClassesClosure : public KlassClosure {
+private:
+  Stack<jclass, mtInternal> _classStack;
+  JvmtiEnv* _env;
 
-// The closure for GetLoadedClasses and GetClassLoaderClasses
+public:
+  LoadedClassesClosure(JvmtiEnv* env) {
+    _env = env;
+  }
+
+  void do_klass(Klass* k) {
+    // Collect all jclasses
+    _classStack.push((jclass) _env->jni_reference(k->java_mirror()));
+  }
+
+  int extract(jclass* result_list) {
+    // The size of the Stack will be 0 after extract, so get it here
+    int count = (int)_classStack.size();
+    int i = count;
+
+    // Pop all jclasses, fill backwards
+    while (!_classStack.is_empty()) {
+      result_list[--i] = _classStack.pop();
+    }
+
+    // Return the number of elements written
+    return count;
+  }
+
+  // Return current size of the Stack
+  int get_count() {
+    return (int)_classStack.size();
+  }
+};
+
+// The closure for GetClassLoaderClasses
 class JvmtiGetLoadedClassesClosure : public StackObj {
   // Since the SystemDictionary::classes_do callback
   // doesn't pass a closureData pointer,
@@ -165,19 +200,6 @@
     }
   }
 
-  // Finally, the static methods that are the callbacks
-  static void increment(Klass* k) {
-    JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
-    if (that->get_initiatingLoader() == NULL) {
-      for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) {
-        that->set_count(that->get_count() + 1);
-      }
-    } else if (k != NULL) {
-      // if initiating loader not null, just include the instance with 1 dimension
-      that->set_count(that->get_count() + 1);
-    }
-  }
-
   static void increment_with_loader(Klass* k, ClassLoaderData* loader_data) {
     JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
     oop class_loader = loader_data->class_loader();
@@ -196,24 +218,6 @@
     }
   }
 
-  static void add(Klass* k) {
-    JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
-    if (that->available()) {
-      if (that->get_initiatingLoader() == NULL) {
-        for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) {
-          oop mirror = l->java_mirror();
-          that->set_element(that->get_index(), mirror);
-          that->set_index(that->get_index() + 1);
-        }
-      } else if (k != NULL) {
-        // if initiating loader not null, just include the instance with 1 dimension
-        oop mirror = k->java_mirror();
-        that->set_element(that->get_index(), mirror);
-        that->set_index(that->get_index() + 1);
-      }
-    }
-  }
-
   static void add_with_loader(Klass* k, ClassLoaderData* loader_data) {
     JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
     if (that->available()) {
@@ -255,39 +259,30 @@
 
 jvmtiError
 JvmtiGetLoadedClasses::getLoadedClasses(JvmtiEnv *env, jint* classCountPtr, jclass** classesPtr) {
-  // Since SystemDictionary::classes_do only takes a function pointer
-  // and doesn't call back with a closure data pointer,
-  // we can only pass static methods.
 
-  JvmtiGetLoadedClassesClosure closure;
+  LoadedClassesClosure closure(env);
   {
     // To get a consistent list of classes we need MultiArray_lock to ensure
-    // array classes aren't created, and SystemDictionary_lock to ensure that
-    // classes aren't added to the system dictionary,
+    // array classes aren't created.
     MutexLocker ma(MultiArray_lock);
-    MutexLocker sd(SystemDictionary_lock);
+
+    // Iterate through all classes in ClassLoaderDataGraph
+    // and collect them using the LoadedClassesClosure
+    ClassLoaderDataGraph::loaded_classes_do(&closure);
+  }
 
-    // First, count the classes
-    SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::increment);
-    Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::increment);
-    // Next, fill in the classes
-    closure.allocate();
-    SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::add);
-    Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::add);
-    // Drop the SystemDictionary_lock, so the results could be wrong from here,
-    // but we still have a snapshot.
+  // Return results by extracting the collected contents into a list
+  // allocated via JvmtiEnv
+  jclass* result_list;
+  jvmtiError error = env->Allocate(closure.get_count() * sizeof(jclass),
+                               (unsigned char**)&result_list);
+
+  if (error == JVMTI_ERROR_NONE) {
+    int count = closure.extract(result_list);
+    *classCountPtr = count;
+    *classesPtr = result_list;
   }
-  // Post results
-  jclass* result_list;
-  jvmtiError err = env->Allocate(closure.get_count() * sizeof(jclass),
-                                 (unsigned char**)&result_list);
-  if (err != JVMTI_ERROR_NONE) {
-    return err;
-  }
-  closure.extract(env, result_list);
-  *classCountPtr = closure.get_count();
-  *classesPtr = result_list;
-  return JVMTI_ERROR_NONE;
+  return error;
 }
 
 jvmtiError
diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/share/vm/services/jmm.h
--- a/src/share/vm/services/jmm.h	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/share/vm/services/jmm.h	Fri Oct 25 22:06:43 2013 -0700
@@ -78,6 +78,7 @@
   JMM_COMPILE_TOTAL_TIME_MS          = 8,    /* Total accumulated time spent in compilation */
   JMM_GC_TIME_MS                     = 9,    /* Total accumulated time spent in collection */
   JMM_GC_COUNT                       = 10,   /* Total number of collections */
+  JMM_JVM_UPTIME_MS                  = 11,   /* The JVM uptime in milliseconds */
 
   JMM_INTERNAL_ATTRIBUTE_INDEX       = 100,
   JMM_CLASS_LOADED_BYTES             = 101,  /* Number of bytes loaded instance classes */
diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/share/vm/services/management.cpp
--- a/src/share/vm/services/management.cpp	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/share/vm/services/management.cpp	Fri Oct 25 22:06:43 2013 -0700
@@ -1032,6 +1032,9 @@
   case JMM_JVM_INIT_DONE_TIME_MS:
     return Management::vm_init_done_time();
 
+  case JMM_JVM_UPTIME_MS:
+    return Management::ticks_to_ms(os::elapsed_counter());
+
   case JMM_COMPILE_TOTAL_TIME_MS:
     return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
 
diff -r 0dcdec729cda -r b4aa8fc5d0d5 src/share/vm/utilities/globalDefinitions.hpp
--- a/src/share/vm/utilities/globalDefinitions.hpp	Fri Oct 25 08:38:42 2013 -0700
+++ b/src/share/vm/utilities/globalDefinitions.hpp	Fri Oct 25 22:06:43 2013 -0700
@@ -368,8 +368,6 @@
 // Klass encoding metaspace max size
 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes;
 
-const jlong CompressedKlassPointersBase = NOT_LP64(0) LP64_ONLY(CONST64(0x800000000));  // 32*G
-
 // Machine dependent stuff
 
 #ifdef TARGET_ARCH_x86
diff -r 0dcdec729cda -r b4aa8fc5d0d5 test/runtime/CompressedOops/CompressedClassPointers.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/runtime/CompressedOops/CompressedClassPointers.java	Fri Oct 25 22:06:43 2013 -0700
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 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.
+ */
+
+/*
+ * @test
+ * @bug 8024927
+ * @summary Testing address of compressed class pointer space as best as possible.
+ * @library /testlibrary
+ */
+
+import com.oracle.java.testlibrary.*;
+
+public class CompressedClassPointers {
+
+    public static void smallHeapTest() throws Exception {
+        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+            "-XX:+UnlockDiagnosticVMOptions",
+            "-XX:SharedBaseAddress=8g",
+            "-Xmx128m",
+            "-XX:+PrintCompressedOopsMode",
+            "-XX:+VerifyBeforeGC", "-version");
+        OutputAnalyzer output = new OutputAnalyzer(pb.start());
+        output.shouldContain("Narrow klass base: 0x0000000000000000");
+        output.shouldHaveExitValue(0);
+    }
+
+    public static void smallHeapTestWith3G() throws Exception {
+        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+            "-XX:+UnlockDiagnosticVMOptions",
+            "-XX:CompressedClassSpaceSize=3g",
+            "-Xmx128m",
+            "-XX:+PrintCompressedOopsMode",
+            "-XX:+VerifyBeforeGC", "-version");
+        OutputAnalyzer output = new OutputAnalyzer(pb.start());
+        output.shouldContain("Narrow klass base: 0x0000000000000000, Narrow klass shift: 3");
+        output.shouldHaveExitValue(0);
+    }
+
+    public static void largeHeapTest() throws Exception {
+        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+            "-XX:+UnlockDiagnosticVMOptions",
+            "-Xmx30g",
+            "-XX:+PrintCompressedOopsMode",
+            "-XX:+VerifyBeforeGC", "-version");
+        OutputAnalyzer output = new OutputAnalyzer(pb.start());
+        output.shouldNotContain("Narrow klass base: 0x0000000000000000");
+        output.shouldContain("Narrow klass shift: 0");
+        output.shouldHaveExitValue(0);
+    }
+
+    public static void largePagesTest() throws Exception {
+        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+            "-XX:+UnlockDiagnosticVMOptions",
+            "-Xmx128m",
+            "-XX:+UseLargePages",
+            "-XX:+PrintCompressedOopsMode",
+            "-XX:+VerifyBeforeGC", "-version");
+        OutputAnalyzer output = new OutputAnalyzer(pb.start());
+        output.shouldContain("Narrow klass base:");
+        output.shouldHaveExitValue(0);
+    }
+
+    public static void sharingTest() throws Exception {
+        // Test small heaps
+        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+            "-XX:+UnlockDiagnosticVMOptions",
+            "-XX:SharedArchiveFile=./sample.jsa",
+            "-Xmx128m",
+            "-XX:SharedBaseAddress=8g",
+            "-XX:+PrintCompressedOopsMode",
+            "-XX:+VerifyBeforeGC",
+            "-Xshare:dump");
+        OutputAnalyzer output = new OutputAnalyzer(pb.start());
+        try {
+          output.shouldContain("Loading classes to share");
+          output.shouldHaveExitValue(0);
+
+          pb = ProcessTools.createJavaProcessBuilder(
+            "-XX:+UnlockDiagnosticVMOptions",
+            "-XX:SharedArchiveFile=./sample.jsa",
+            "-Xmx128m",
+            "-XX:SharedBaseAddress=8g",
+            "-XX:+PrintCompressedOopsMode",
+            "-Xshare:on",
+            "-version");
+          output = new OutputAnalyzer(pb.start());
+          output.shouldContain("sharing");
+          output.shouldHaveExitValue(0);
+
+        } catch (RuntimeException e) {
+          output.shouldContain("Unable to use shared archive");
+          output.shouldHaveExitValue(1);
+        }
+    }
+
+  public static void main(String[] args) throws Exception {
+      if (!Platform.is64bit()) {
+          // Can't test this on 32 bit, just pass
+          System.out.println("Skipping test on 32bit");
+          return;
+      }
+      // Solaris 10 can't mmap compressed oops space without a base
+      if (Platform.isSolaris()) {
+           String name = System.getProperty("os.version");
+           if (name.equals("5.10")) {
+               System.out.println("Skipping test on Solaris 10");
+               return;
+           }
+      }
+      smallHeapTest();
+      smallHeapTestWith3G();
+      largeHeapTest();
+      largePagesTest();
+      sharingTest();
+  }
+}