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Java example source code file (NMethod.java)

This example Java source code file (NMethod.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

address, addressfield, cintegerfield, codeblob, hashmap, log2_radix, map\/\*, metadata, methoddata, nmethod, observer, pcdesc, scopedesc, string, util

The NMethod.java Java example source code

/*
 * Copyright (c) 2000, 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.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 AddressField  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  osrLinkField;
  private static AddressField  scavengeRootLinkField;
  private static JByteField    scavengeRootStateField;

  /** Offsets for different nmethod parts */
  private static CIntegerField exceptionOffsetField;
  private static CIntegerField deoptOffsetField;
  private static CIntegerField deoptMhOffsetField;
  private static CIntegerField origPCOffsetField;
  private static CIntegerField stubOffsetField;
  private static CIntegerField oopsOffsetField;
  private static CIntegerField metadataOffsetField;
  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;

  private static CIntegerField compLevelField;

  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");

    methodField                 = type.getAddressField("_method");
    entryBCIField               = type.getCIntegerField("_entry_bci");
    osrLinkField                = type.getAddressField("_osr_link");
    scavengeRootLinkField       = type.getAddressField("_scavenge_root_link");
    scavengeRootStateField      = type.getJByteField("_scavenge_root_state");

    exceptionOffsetField        = type.getCIntegerField("_exception_offset");
    deoptOffsetField            = type.getCIntegerField("_deoptimize_offset");
    deoptMhOffsetField          = type.getCIntegerField("_deoptimize_mh_offset");
    origPCOffsetField           = type.getCIntegerField("_orig_pc_offset");
    stubOffsetField             = type.getCIntegerField("_stub_offset");
    oopsOffsetField             = type.getCIntegerField("_oops_offset");
    metadataOffsetField         = type.getCIntegerField("_metadata_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");
    compLevelField              = type.getCIntegerField("_comp_level");
    pcDescSize = db.lookupType("PcDesc").getSize();
  }

  public NMethod(Address addr) {
    super(addr);
  }


  // Accessors
  public Address getAddress() {
    return addr;
  }

  public Method getMethod() {
    return (Method)Metadata.instantiateWrapperFor(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 contentBegin();                                     }
  public Address constantsEnd()         { return getEntryPoint();                                    }
  public Address instsBegin()           { return codeBegin();                                        }
  public Address instsEnd()             { return headerBegin().addOffsetTo(getStubOffset());         }
  public Address exceptionBegin()       { return headerBegin().addOffsetTo(getExceptionOffset());    }
  public Address deoptHandlerBegin()    { return headerBegin().addOffsetTo(getDeoptOffset());        }
  public Address deoptMhHandlerBegin()  { return headerBegin().addOffsetTo(getDeoptMhOffset());      }
  public Address stubBegin()            { return headerBegin().addOffsetTo(getStubOffset());         }
  public Address stubEnd()              { return headerBegin().addOffsetTo(getOopsOffset());         }
  public Address oopsBegin()            { return headerBegin().addOffsetTo(getOopsOffset());         }
  public Address oopsEnd()              { return headerBegin().addOffsetTo(getMetadataOffset());     }
  public Address metadataBegin()        { return headerBegin().addOffsetTo(getMetadataOffset());     }
  public Address metadataEnd()          { 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 instsSize()                { return (int) instsEnd()       .minus(instsBegin());        }
  public int stubSize()                 { return (int) stubEnd()        .minus(stubBegin());         }
  public int oopsSize()                 { return (int) oopsEnd()        .minus(oopsBegin());         }
  public int metadataSize()             { return (int) metadataEnd()    .minus(metadataBegin());     }
  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()    +
      instsSize()        +
      stubSize()         +
      scopesDataSize()   +
      scopesPCsSize()    +
      dependenciesSize() +
      handlerTableSize() +
      nulChkTableSize();
  }

  public boolean constantsContains   (Address addr) { return constantsBegin()   .lessThanOrEqual(addr) && constantsEnd()   .greaterThan(addr); }
  public boolean instsContains       (Address addr) { return instsBegin()       .lessThanOrEqual(addr) && instsEnd()       .greaterThan(addr); }
  public boolean stubContains        (Address addr) { return stubBegin()        .lessThanOrEqual(addr) && stubEnd()        .greaterThan(addr); }
  public boolean oopsContains        (Address addr) { return oopsBegin()        .lessThanOrEqual(addr) && oopsEnd()        .greaterThan(addr); }
  public boolean metadataContains    (Address addr) { return metadataBegin()    .lessThanOrEqual(addr) && metadataEnd()    .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); }

  public int getOopsLength() { return (int) (oopsSize() / VM.getVM().getOopSize()); }
  public int getMetadataLength() { return (int) (metadataSize() / VM.getVM().getOopSize()); }

  /** Entry points */
  public Address getEntryPoint()         { return entryPointField.getValue(addr);         }
  public Address getVerifiedEntryPoint() { return verifiedEntryPointField.getValue(addr); }

  /** Support for oops in scopes and relocs. Note: index 0 is reserved for null. */
  public OopHandle getOopAt(int index) {
    if (index == 0) return null;
    if (Assert.ASSERTS_ENABLED) {
      Assert.that(index > 0 && index <= getOopsLength(), "must be a valid non-zero index");
    }
    return oopsBegin().getOopHandleAt((index - 1) * VM.getVM().getOopSize());
  }

  /** Support for metadata in scopes and relocs. Note: index 0 is reserved for null. */
  public Address getMetadataAt(int index) {
    if (index == 0) return null;
    if (Assert.ASSERTS_ENABLED) {
      Assert.that(index > 0 && index <= getMetadataLength(), "must be a valid non-zero index");
    }
    return metadataBegin().getAddressAt((index - 1) * VM.getVM().getOopSize());
  }

  public Method getMethodAt(int index) {
    return (Method)Metadata.instantiateWrapperFor(getMetadataAt(index));
  }

  // 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 getOSRLink() {
    return (NMethod) VMObjectFactory.newObject(NMethod.class, osrLinkField.getValue(addr));
  }

  public NMethod getScavengeRootLink() {
    return (NMethod) VMObjectFactory.newObject(NMethod.class, scavengeRootLinkField.getValue(addr));
  }

  public int getScavengeRootState() {
    return (int) scavengeRootStateField.getValue(addr);
  }

  // MethodHandle
  public boolean isMethodHandleReturn(Address returnPc) {
    // Hard to read a bit fields from Java and it's only there for performance
    // so just go directly to the PCDesc
    // if (!hasMethodHandleInvokes())  return false;
    PCDesc pd = getPCDescAt(returnPc);
    if (pd == null)
      return false;
    return pd.isMethodHandleInvoke();
  }

  // Deopt
  // Return true is the PC is one would expect if the frame is being deopted.
  public boolean isDeoptPc      (Address pc) { return isDeoptEntry(pc) || isDeoptMhEntry(pc); }
  public boolean isDeoptEntry   (Address pc) { return pc == deoptHandlerBegin(); }
  public boolean isDeoptMhEntry (Address pc) { return pc == deoptMhHandlerBegin(); }

  /** 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(), pd.getObjDecodeOffset(), pd.getReexecute());
  }

  /** 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;
  }

  PCDesc find_pc_desc(long pc, boolean approximate) {
    return find_pc_desc_internal(pc, approximate);
  }

  // Finds a PcDesc with real-pc equal to "pc"
  PCDesc find_pc_desc_internal(long pc, boolean approximate) {
    long base_address = VM.getAddressValue(codeBegin());
    int pc_offset = (int) (pc - base_address);

    // Fallback algorithm: quasi-linear search for the PcDesc
    // Find the last pc_offset less than the given offset.
    // The successor must be the required match, if there is a match at all.
    // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
    Address lower = scopesPCsBegin();
    Address upper = scopesPCsEnd();
    upper = upper.addOffsetTo(-pcDescSize); // exclude final sentinel
    if (lower.greaterThan(upper))  return null;  // native method; no PcDescs at all

    // Take giant steps at first (4096, then 256, then 16, then 1)
    int LOG2_RADIX = 4;
    int RADIX = (1 << LOG2_RADIX);
    Address mid;
    for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
      while ((mid = lower.addOffsetTo(step * pcDescSize)).lessThan(upper)) {
        PCDesc m = new PCDesc(mid);
        if (m.getPCOffset() < pc_offset) {
          lower = mid;
        } else {
          upper = mid;
          break;
        }
      }
    }
    // Sneak up on the value with a linear search of length ~16.
    while (true) {
      mid = lower.addOffsetTo(pcDescSize);
      PCDesc m = new PCDesc(mid);
      if (m.getPCOffset() < pc_offset) {
        lower = mid;
      } else {
        upper = mid;
        break;
      }
    }

    PCDesc u = new PCDesc(upper);
    if (match_desc(u, pc_offset, approximate)) {
      return u;
    } else {
      return null;
    }
  }

  // ScopeDesc retrieval operation
  PCDesc pc_desc_at(long pc)   { return find_pc_desc(pc, false); }
  // pc_desc_near returns the first PCDesc at or after the givne pc.
  PCDesc pc_desc_near(long pc) { return find_pc_desc(pc, true); }

  // Return a the last scope in (begin..end]
  public ScopeDesc scope_desc_in(long begin, long end) {
    PCDesc p = pc_desc_near(begin+1);
    if (p != null && VM.getAddressValue(p.getRealPC(this)) <= end) {
      return new ScopeDesc(this, p.getScopeDecodeOffset(), p.getObjDecodeOffset(), p.getReexecute());
    }
    return null;
  }

  static boolean match_desc(PCDesc pc, int pc_offset, boolean approximate) {
    if (!approximate) {
      return pc.getPCOffset() == pc_offset;
    } else {
      PCDesc prev = new PCDesc(pc.getAddress().addOffsetTo(-pcDescSize));
       return prev.getPCOffset() < pc_offset && pc_offset <= pc.getPCOffset();
    }
  }

  /** 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(), pd.getObjDecodeOffset(), pd.getReexecute());
  }

  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);
  }

  protected void printComponentsOn(PrintStream tty) {
    // FIXME: add relocation information
    tty.println(" content: [" + contentBegin() + ", " + contentEnd() + "), " +
                " code: [" + codeBegin() + ", " + codeEnd() + "), " +
                " data: [" + dataBegin() + ", " + dataEnd() + "), " +
                " oops: [" + oopsBegin() + ", " + oopsEnd() + "), " +
                " frame size: " + getFrameSize());
  }

  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();
  }

  public void dumpReplayData(PrintStream out) {
    HashMap h = new HashMap();
    for (int i = 1; i < getMetadataLength(); i++) {
      Metadata meta = Metadata.instantiateWrapperFor(getMetadataAt(i));
      System.err.println(meta);
      if (h.get(meta) != null) continue;
      h.put(meta, meta);
      if (meta instanceof InstanceKlass) {
        ((InstanceKlass)meta).dumpReplayData(out);
      } else if (meta instanceof Method) {
        ((Method)meta).dumpReplayData(out);
        MethodData mdo = ((Method)meta).getMethodData();
        if (mdo != null) {
          mdo.dumpReplayData(out);
        }
      }
    }
    Method method = getMethod();
    if (h.get(method) == null) {
      method.dumpReplayData(out);
      MethodData mdo = method.getMethodData();
      if (mdo != null) {
        mdo.dumpReplayData(out);
      }
    }
    if (h.get(method.getMethodHolder()) == null) {
      ((InstanceKlass)method.getMethodHolder()).dumpReplayData(out);
    }
    Klass holder = method.getMethodHolder();
    out.println("compile " + holder.getName().asString() + " " +
                OopUtilities.escapeString(method.getName().asString()) + " " +
                method.getSignature().asString() + " " +
                getEntryBCI() + " " + getCompLevel());

  }

  //--------------------------------------------------------------------------------
  // 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 getDeoptMhOffset()      { return (int) deoptMhOffsetField     .getValue(addr); }
  private int getStubOffset()         { return (int) stubOffsetField        .getValue(addr); }
  private int getOopsOffset()         { return (int) oopsOffsetField        .getValue(addr); }
  private int getMetadataOffset()     { return (int) metadataOffsetField    .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); }
  private int getCompLevel()          { return (int) compLevelField         .getValue(addr); }
}

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