--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/code/NMethod.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,361 @@
+/*
+ * Copyright 2000-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+package sun.jvm.hotspot.code;
+
+import java.io.*;
+import java.util.*;
+import sun.jvm.hotspot.debugger.*;
+import sun.jvm.hotspot.memory.*;
+import sun.jvm.hotspot.oops.*;
+import sun.jvm.hotspot.runtime.*;
+import sun.jvm.hotspot.types.*;
+import sun.jvm.hotspot.utilities.*;
+
+public class NMethod extends CodeBlob {
+  private static long          pcDescSize;
+  private static CIntegerField zombieInstructionSizeField;
+  private static sun.jvm.hotspot.types.OopField methodField;
+  /** != InvocationEntryBci if this nmethod is an on-stack replacement method */
+  private static CIntegerField entryBCIField;
+  /** To support simple linked-list chaining of nmethods */
+  private static AddressField  linkField;
+  /** Offsets for different nmethod parts */
+  private static CIntegerField exceptionOffsetField;
+  private static CIntegerField deoptOffsetField;
+  private static CIntegerField origPCOffsetField;
+  private static CIntegerField stubOffsetField;
+  private static CIntegerField scopesDataOffsetField;
+  private static CIntegerField scopesPCsOffsetField;
+  private static CIntegerField dependenciesOffsetField;
+  private static CIntegerField handlerTableOffsetField;
+  private static CIntegerField nulChkTableOffsetField;
+  private static CIntegerField nmethodEndOffsetField;
+
+  /** Offsets for entry points */
+  /** Entry point with class check */
+  private static AddressField  entryPointField;
+  /** Entry point without class check */
+  private static AddressField  verifiedEntryPointField;
+  /** Entry point for on stack replacement */
+  private static AddressField  osrEntryPointField;
+
+  // FIXME: add access to flags (how?)
+
+  /** NMethod Flushing lock (if non-zero, then the nmethod is not removed) */
+  private static JIntField     lockCountField;
+
+  /** not_entrant method removal. Each mark_sweep pass will update
+      this mark to current sweep invocation count if it is seen on the
+      stack.  An not_entrant method can be removed when there is no
+      more activations, i.e., when the _stack_traversal_mark is less than
+      current sweep traversal index. */
+  private static CIntegerField stackTraversalMarkField;
+
+  static {
+    VM.registerVMInitializedObserver(new Observer() {
+        public void update(Observable o, Object data) {
+          initialize(VM.getVM().getTypeDataBase());
+        }
+      });
+  }
+
+  private static void initialize(TypeDataBase db) {
+    Type type = db.lookupType("nmethod");
+
+    zombieInstructionSizeField  = type.getCIntegerField("_zombie_instruction_size");
+    methodField                 = type.getOopField("_method");
+    entryBCIField               = type.getCIntegerField("_entry_bci");
+    linkField                   = type.getAddressField("_link");
+    exceptionOffsetField        = type.getCIntegerField("_exception_offset");
+    deoptOffsetField            = type.getCIntegerField("_deoptimize_offset");
+    origPCOffsetField           = type.getCIntegerField("_orig_pc_offset");
+    stubOffsetField             = type.getCIntegerField("_stub_offset");
+    scopesDataOffsetField       = type.getCIntegerField("_scopes_data_offset");
+    scopesPCsOffsetField        = type.getCIntegerField("_scopes_pcs_offset");
+    dependenciesOffsetField     = type.getCIntegerField("_dependencies_offset");
+    handlerTableOffsetField     = type.getCIntegerField("_handler_table_offset");
+    nulChkTableOffsetField      = type.getCIntegerField("_nul_chk_table_offset");
+    nmethodEndOffsetField       = type.getCIntegerField("_nmethod_end_offset");
+    entryPointField             = type.getAddressField("_entry_point");
+    verifiedEntryPointField     = type.getAddressField("_verified_entry_point");
+    osrEntryPointField          = type.getAddressField("_osr_entry_point");
+    lockCountField              = type.getJIntField("_lock_count");
+    stackTraversalMarkField     = type.getCIntegerField("_stack_traversal_mark");
+
+    pcDescSize = db.lookupType("PcDesc").getSize();
+  }
+
+  public NMethod(Address addr) {
+    super(addr);
+  }
+
+
+  // Accessors
+  public Address getAddress() {
+    return addr;
+  }
+
+  public Method getMethod() {
+    return (Method) VM.getVM().getObjectHeap().newOop(methodField.getValue(addr));
+  }
+
+  // Type info
+  public boolean isNMethod()      { return true;                    }
+  public boolean isJavaMethod()   { return !getMethod().isNative(); }
+  public boolean isNativeMethod() { return getMethod().isNative();  }
+  public boolean isOSRMethod()    { return getEntryBCI() != VM.getVM().getInvocationEntryBCI(); }
+
+  /** Boundaries for different parts */
+  public Address constantsBegin()       { return instructionsBegin();                                }
+  public Address constantsEnd()         { return getEntryPoint();                                    }
+  public Address codeBegin()            { return getEntryPoint();                                    }
+  public Address codeEnd()              { return headerBegin().addOffsetTo(getStubOffset());         }
+  public Address exceptionBegin()       { return headerBegin().addOffsetTo(getExceptionOffset());    }
+  public Address deoptBegin()           { return headerBegin().addOffsetTo(getDeoptOffset());        }
+  public Address stubBegin()            { return headerBegin().addOffsetTo(getStubOffset());         }
+  public Address stubEnd()              { return headerBegin().addOffsetTo(getScopesDataOffset());   }
+  public Address scopesDataBegin()      { return headerBegin().addOffsetTo(getScopesDataOffset());   }
+  public Address scopesDataEnd()        { return headerBegin().addOffsetTo(getScopesPCsOffset());    }
+  public Address scopesPCsBegin()       { return headerBegin().addOffsetTo(getScopesPCsOffset());    }
+  public Address scopesPCsEnd()         { return headerBegin().addOffsetTo(getDependenciesOffset()); }
+  public Address dependenciesBegin()    { return headerBegin().addOffsetTo(getDependenciesOffset()); }
+  public Address dependenciesEnd()      { return headerBegin().addOffsetTo(getHandlerTableOffset()); }
+  public Address handlerTableBegin()    { return headerBegin().addOffsetTo(getHandlerTableOffset()); }
+  public Address handlerTableEnd()      { return headerBegin().addOffsetTo(getNulChkTableOffset());  }
+  public Address nulChkTableBegin()     { return headerBegin().addOffsetTo(getNulChkTableOffset());  }
+  public Address nulChkTableEnd()       { return headerBegin().addOffsetTo(getNMethodEndOffset());   }
+
+  public int constantsSize()            { return (int) constantsEnd()   .minus(constantsBegin());    }
+  public int codeSize()                 { return (int) codeEnd()        .minus(codeBegin());         }
+  public int stubSize()                 { return (int) stubEnd()        .minus(stubBegin());         }
+  public int scopesDataSize()           { return (int) scopesDataEnd()  .minus(scopesDataBegin());   }
+  public int scopesPCsSize()            { return (int) scopesPCsEnd()   .minus(scopesPCsBegin());    }
+  public int dependenciesSize()         { return (int) dependenciesEnd().minus(dependenciesBegin()); }
+  public int handlerTableSize()         { return (int) handlerTableEnd().minus(handlerTableBegin()); }
+  public int nulChkTableSize()          { return (int) nulChkTableEnd() .minus(nulChkTableBegin());  }
+  public int origPCOffset()             { return (int) origPCOffsetField.getValue(addr);             }
+
+  public int totalSize() {
+    return
+      constantsSize()    +
+      codeSize()         +
+      stubSize()         +
+      scopesDataSize()   +
+      scopesPCsSize()    +
+      dependenciesSize() +
+      handlerTableSize() +
+      nulChkTableSize();
+  }
+
+  public boolean constantsContains   (Address addr) { return constantsBegin()   .lessThanOrEqual(addr) && constantsEnd()   .greaterThan(addr); }
+  public boolean codeContains        (Address addr) { return codeBegin()        .lessThanOrEqual(addr) && codeEnd()        .greaterThan(addr); }
+  public boolean stubContains        (Address addr) { return stubBegin()        .lessThanOrEqual(addr) && stubEnd()        .greaterThan(addr); }
+  public boolean scopesDataContains  (Address addr) { return scopesDataBegin()  .lessThanOrEqual(addr) && scopesDataEnd()  .greaterThan(addr); }
+  public boolean scopesPCsContains   (Address addr) { return scopesPCsBegin()   .lessThanOrEqual(addr) && scopesPCsEnd()   .greaterThan(addr); }
+  public boolean handlerTableContains(Address addr) { return handlerTableBegin().lessThanOrEqual(addr) && handlerTableEnd().greaterThan(addr); }
+  public boolean nulChkTableContains (Address addr) { return nulChkTableBegin() .lessThanOrEqual(addr) && nulChkTableEnd() .greaterThan(addr); }
+
+  /** Entry points */
+  public Address getEntryPoint()         { return entryPointField.getValue(addr);         }
+  public Address getVerifiedEntryPoint() { return verifiedEntryPointField.getValue(addr); }
+
+  // FIXME: add interpreter_entry_point()
+  // FIXME: add lazy_interpreter_entry_point() for C2
+
+  // **********
+  // * FIXME: * ADD ACCESS TO FLAGS!!!!
+  // **********
+  // public boolean isInUse();
+  // public boolean isAlive();
+  // public boolean isNotEntrant();
+  // public boolean isZombie();
+
+  // ********************************
+  // * MAJOR FIXME: MAJOR HACK HERE *
+  // ********************************
+  public boolean isZombie() { return false; }
+
+  // public boolean isUnloaded();
+  // public boolean isYoung();
+  // public boolean isOld();
+  // public int     age();
+  // public boolean isMarkedForDeoptimization();
+  // public boolean isMarkedForUnloading();
+  // public boolean isMarkedForReclamation();
+  // public int     level();
+  // public int     version();
+
+  // FIXME: add mutators for above
+  // FIXME: add exception cache access?
+
+  /** On-stack replacement support */
+  // FIXME: add mutators
+  public int getOSREntryBCI() {
+    if (Assert.ASSERTS_ENABLED) {
+      Assert.that(getEntryBCI() != VM.getVM().getInvocationEntryBCI(), "wrong kind of nmethod");
+    }
+    return getEntryBCI();
+  }
+
+  public NMethod getLink() {
+    return (NMethod) VMObjectFactory.newObject(NMethod.class, linkField.getValue(addr));
+  }
+
+  /** Tells whether frames described by this nmethod can be
+      deoptimized. Note: native wrappers cannot be deoptimized. */
+  public boolean canBeDeoptimized() { return isJavaMethod(); }
+
+  // FIXME: add inline cache support
+  // FIXME: add flush()
+
+  public boolean isLockedByVM() { return lockCountField.getValue(addr) > 0; }
+
+  // FIXME: add mark_as_seen_on_stack
+  // FIXME: add can_not_entrant_be_converted
+
+  // FIXME: add GC support
+  //  void follow_roots_or_mark_for_unloading(bool unloading_occurred, bool& marked_for_unloading);
+  //  void follow_root_or_mark_for_unloading(oop* root, bool unloading_occurred, bool& marked_for_unloading);
+  //  void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, void f(oop*));
+  //  void adjust_pointers();
+
+  /** Finds a PCDesc with real-pc equal to "pc" */
+  public PCDesc getPCDescAt(Address pc) {
+    // FIXME: consider adding cache like the one down in the VM
+    for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) {
+      PCDesc pcDesc = new PCDesc(p);
+      if (pcDesc.getRealPC(this).equals(pc)) {
+        return pcDesc;
+      }
+    }
+    return null;
+  }
+
+  /** ScopeDesc for an instruction */
+  public ScopeDesc getScopeDescAt(Address pc) {
+    PCDesc pd = getPCDescAt(pc);
+    if (Assert.ASSERTS_ENABLED) {
+      Assert.that(pd != null, "scope must be present");
+    }
+    return new ScopeDesc(this, pd.getScopeDecodeOffset());
+  }
+
+  /** This is only for use by the debugging system, and is only
+      intended for use in the topmost frame, where we are not
+      guaranteed to be at a PC for which we have a PCDesc. It finds
+      the PCDesc with realPC closest to the current PC. */
+  public PCDesc getPCDescNearDbg(Address pc) {
+    PCDesc bestGuessPCDesc = null;
+    long bestDistance = 0;
+    for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) {
+      PCDesc pcDesc = new PCDesc(p);
+      // In case pc is null
+      long distance = -pcDesc.getRealPC(this).minus(pc);
+      if ((bestGuessPCDesc == null) ||
+          ((distance >= 0) && (distance < bestDistance))) {
+        bestGuessPCDesc = pcDesc;
+        bestDistance    = distance;
+      }
+    }
+    return bestGuessPCDesc;
+  }
+
+  /** This is only for use by the debugging system, and is only
+      intended for use in the topmost frame, where we are not
+      guaranteed to be at a PC for which we have a PCDesc. It finds
+      the ScopeDesc closest to the current PC. NOTE that this may
+      return NULL for compiled methods which don't have any
+      ScopeDescs! */
+  public ScopeDesc getScopeDescNearDbg(Address pc) {
+    PCDesc pd = getPCDescNearDbg(pc);
+    if (pd == null) return null;
+    return new ScopeDesc(this, pd.getScopeDecodeOffset());
+  }
+
+  public Map/*<Address, PcDesc>*/ getSafepoints() {
+    Map safepoints = new HashMap(); // Map<Address, PcDesc>
+    sun.jvm.hotspot.debugger.Address p = null;
+    for (p = scopesPCsBegin(); p.lessThan(scopesPCsEnd());
+         p = p.addOffsetTo(pcDescSize)) {
+       PCDesc pcDesc = new PCDesc(p);
+       sun.jvm.hotspot.debugger.Address pc = pcDesc.getRealPC(this);
+       safepoints.put(pc, pcDesc);
+    }
+    return safepoints;
+  }
+
+  // FIXME: add getPCOffsetForBCI()
+  // FIXME: add embeddedOopAt()
+  // FIXME: add isDependentOn()
+  // FIXME: add isPatchableAt()
+
+  /** Support for code generation. Only here for proof-of-concept. */
+  public static int getEntryPointOffset()            { return (int) entryPointField.getOffset();            }
+  public static int getVerifiedEntryPointOffset()    { return (int) verifiedEntryPointField.getOffset();    }
+  public static int getOSREntryPointOffset()         { return (int) osrEntryPointField.getOffset();         }
+  public static int getEntryBCIOffset()              { return (int) entryBCIField.getOffset();              }
+  /** NOTE: renamed from "method_offset_in_bytes" */
+  public static int getMethodOffset()                { return (int) methodField.getOffset();                }
+
+  public void print() {
+    printOn(System.out);
+  }
+
+  public String toString() {
+    Method method = getMethod();
+    return "NMethod for " +
+            method.getMethodHolder().getName().asString() + "." +
+            method.getName().asString() + method.getSignature().asString() + "==>n" +
+            super.toString();
+  }
+
+  public String flagsToString() {
+    // FIXME need access to flags...
+    return "";
+  }
+
+  public String getName() {
+    Method method = getMethod();
+    return "NMethod for " +
+           method.getMethodHolder().getName().asString() + "." +
+           method.getName().asString() +
+           method.getSignature().asString();
+  }
+
+  //--------------------------------------------------------------------------------
+  // Internals only below this point
+  //
+
+  private int getEntryBCI()           { return (int) entryBCIField          .getValue(addr); }
+  private int getExceptionOffset()    { return (int) exceptionOffsetField   .getValue(addr); }
+  private int getDeoptOffset()        { return (int) deoptOffsetField       .getValue(addr); }
+  private int getStubOffset()         { return (int) stubOffsetField        .getValue(addr); }
+  private int getScopesDataOffset()   { return (int) scopesDataOffsetField  .getValue(addr); }
+  private int getScopesPCsOffset()    { return (int) scopesPCsOffsetField   .getValue(addr); }
+  private int getDependenciesOffset() { return (int) dependenciesOffsetField.getValue(addr); }
+  private int getHandlerTableOffset() { return (int) handlerTableOffsetField.getValue(addr); }
+  private int getNulChkTableOffset()  { return (int) nulChkTableOffsetField .getValue(addr); }
+  private int getNMethodEndOffset()   { return (int) nmethodEndOffsetField  .getValue(addr); }
+}