1 /*
   2  * Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.hotspot;
  24 
  25 import java.util.EnumSet;
  26 
  27 import org.graalvm.compiler.code.CompilationResult;
  28 import org.graalvm.compiler.core.common.CompilationIdentifier;
  29 import org.graalvm.compiler.core.common.cfg.AbstractBlockBase;
  30 import org.graalvm.compiler.core.common.spi.ForeignCallDescriptor;
  31 import org.graalvm.compiler.core.common.spi.ForeignCallLinkage;
  32 import org.graalvm.compiler.core.target.Backend;
  33 import org.graalvm.compiler.graph.Node.ConstantNodeParameter;
  34 import org.graalvm.compiler.graph.Node.NodeIntrinsic;
  35 import org.graalvm.compiler.hotspot.meta.HotSpotProviders;
  36 import org.graalvm.compiler.hotspot.nodes.VMErrorNode;
  37 import org.graalvm.compiler.hotspot.nodes.aot.ResolveConstantStubCall;
  38 import org.graalvm.compiler.hotspot.replacements.AESCryptSubstitutions;
  39 import org.graalvm.compiler.hotspot.replacements.BigIntegerSubstitutions;
  40 import org.graalvm.compiler.hotspot.replacements.CipherBlockChainingSubstitutions;
  41 import org.graalvm.compiler.hotspot.replacements.SHA2Substitutions;
  42 import org.graalvm.compiler.hotspot.replacements.SHA5Substitutions;
  43 import org.graalvm.compiler.hotspot.replacements.SHASubstitutions;
  44 import org.graalvm.compiler.hotspot.stubs.ExceptionHandlerStub;
  45 import org.graalvm.compiler.hotspot.stubs.Stub;
  46 import org.graalvm.compiler.hotspot.stubs.UnwindExceptionToCallerStub;
  47 import org.graalvm.compiler.hotspot.word.KlassPointer;
  48 import org.graalvm.compiler.hotspot.word.MethodCountersPointer;
  49 import org.graalvm.compiler.lir.LIR;
  50 import org.graalvm.compiler.lir.LIRFrameState;
  51 import org.graalvm.compiler.lir.LIRInstruction;
  52 import org.graalvm.compiler.lir.LIRInstruction.OperandFlag;
  53 import org.graalvm.compiler.lir.LIRInstruction.OperandMode;
  54 import org.graalvm.compiler.lir.StandardOp.LabelOp;
  55 import org.graalvm.compiler.lir.StandardOp.SaveRegistersOp;
  56 import org.graalvm.compiler.lir.ValueConsumer;
  57 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  58 import org.graalvm.compiler.lir.framemap.FrameMap;
  59 import org.graalvm.compiler.nodes.UnwindNode;
  60 import org.graalvm.compiler.nodes.extended.ForeignCallNode;
  61 import org.graalvm.compiler.options.Option;
  62 import org.graalvm.compiler.options.OptionKey;
  63 import org.graalvm.compiler.options.OptionType;
  64 import org.graalvm.compiler.options.OptionValues;
  65 import org.graalvm.compiler.phases.tiers.SuitesProvider;
  66 import org.graalvm.compiler.word.Word;
  67 import org.graalvm.util.EconomicMap;
  68 import org.graalvm.util.EconomicSet;
  69 import org.graalvm.util.Equivalence;
  70 import org.graalvm.util.MapCursor;
  71 import org.graalvm.word.Pointer;
  72 
  73 import jdk.vm.ci.code.CompilationRequest;
  74 import jdk.vm.ci.code.CompiledCode;
  75 import jdk.vm.ci.code.Register;
  76 import jdk.vm.ci.code.RegisterSaveLayout;
  77 import jdk.vm.ci.code.StackSlot;
  78 import jdk.vm.ci.code.ValueUtil;
  79 import jdk.vm.ci.hotspot.HotSpotCompilationRequest;
  80 import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime;
  81 import jdk.vm.ci.hotspot.HotSpotResolvedJavaMethod;
  82 import jdk.vm.ci.meta.ResolvedJavaMethod;
  83 import jdk.vm.ci.meta.Value;
  84 import jdk.vm.ci.runtime.JVMCICompiler;
  85 
  86 /**
  87  * HotSpot specific backend.
  88  */
  89 public abstract class HotSpotBackend extends Backend implements FrameMap.ReferenceMapBuilderFactory {
  90 
  91     public static class Options {
  92         // @formatter:off
  93         @Option(help = "Use Graal arithmetic stubs instead of HotSpot stubs where possible")
  94         public static final OptionKey<Boolean> GraalArithmeticStubs = new OptionKey<>(true);
  95         @Option(help = "Enables instruction profiling on assembler level. Valid values are a comma separated list of supported instructions." +
  96                         " Compare with subclasses of Assembler.InstructionCounter.", type = OptionType.Debug)
  97         public static final OptionKey<String> ASMInstructionProfiling = new OptionKey<>(null);
  98         // @formatter:on
  99     }
 100 
 101     /**
 102      * Descriptor for {@link ExceptionHandlerStub}. This stub is called by the
 103      * {@linkplain GraalHotSpotVMConfig#MARKID_EXCEPTION_HANDLER_ENTRY exception handler} in a
 104      * compiled method.
 105      */
 106     public static final ForeignCallDescriptor EXCEPTION_HANDLER = new ForeignCallDescriptor("exceptionHandler", void.class, Object.class, Word.class);
 107 
 108     /**
 109      * Descriptor for SharedRuntime::get_ic_miss_stub().
 110      */
 111     public static final ForeignCallDescriptor IC_MISS_HANDLER = new ForeignCallDescriptor("icMissHandler", void.class);
 112 
 113     /**
 114      * Descriptor for SharedRuntime::get_handle_wrong_method_stub().
 115      */
 116     public static final ForeignCallDescriptor WRONG_METHOD_HANDLER = new ForeignCallDescriptor("wrongMethodHandler", void.class);
 117 
 118     /**
 119      * Descriptor for {@link UnwindExceptionToCallerStub}. This stub is called by code generated
 120      * from {@link UnwindNode}.
 121      */
 122     public static final ForeignCallDescriptor UNWIND_EXCEPTION_TO_CALLER = new ForeignCallDescriptor("unwindExceptionToCaller", void.class, Object.class, Word.class);
 123 
 124     /**
 125      * Descriptor for the arguments when unwinding to an exception handler in a caller.
 126      */
 127     public static final ForeignCallDescriptor EXCEPTION_HANDLER_IN_CALLER = new ForeignCallDescriptor("exceptionHandlerInCaller", void.class, Object.class, Word.class);
 128 
 129     private final HotSpotGraalRuntimeProvider runtime;
 130 
 131     /**
 132      * @see AESCryptSubstitutions#encryptBlockStub(ForeignCallDescriptor, Word, Word, Pointer)
 133      */
 134     public static final ForeignCallDescriptor ENCRYPT_BLOCK = new ForeignCallDescriptor("encrypt_block", void.class, Word.class, Word.class, Pointer.class);
 135 
 136     /**
 137      * @see AESCryptSubstitutions#decryptBlockStub(ForeignCallDescriptor, Word, Word, Pointer)
 138      */
 139     public static final ForeignCallDescriptor DECRYPT_BLOCK = new ForeignCallDescriptor("decrypt_block", void.class, Word.class, Word.class, Pointer.class);
 140 
 141     /**
 142      * @see AESCryptSubstitutions#decryptBlockStub(ForeignCallDescriptor, Word, Word, Pointer)
 143      */
 144     public static final ForeignCallDescriptor DECRYPT_BLOCK_WITH_ORIGINAL_KEY = new ForeignCallDescriptor("decrypt_block_with_original_key", void.class, Word.class, Word.class, Pointer.class,
 145                     Pointer.class);
 146 
 147     /**
 148      * @see CipherBlockChainingSubstitutions#crypt
 149      */
 150     public static final ForeignCallDescriptor ENCRYPT = new ForeignCallDescriptor("encrypt", void.class, Word.class, Word.class, Pointer.class, Pointer.class, int.class);
 151 
 152     /**
 153      * @see CipherBlockChainingSubstitutions#crypt
 154      */
 155     public static final ForeignCallDescriptor DECRYPT = new ForeignCallDescriptor("decrypt", void.class, Word.class, Word.class, Pointer.class, Pointer.class, int.class);
 156 
 157     /**
 158      * @see CipherBlockChainingSubstitutions#crypt
 159      */
 160     public static final ForeignCallDescriptor DECRYPT_WITH_ORIGINAL_KEY = new ForeignCallDescriptor("decrypt_with_original_key", void.class, Word.class, Word.class, Pointer.class, Pointer.class,
 161                     int.class, Pointer.class);
 162 
 163     /**
 164      * @see BigIntegerSubstitutions#multiplyToLen
 165      */
 166     public static final ForeignCallDescriptor MULTIPLY_TO_LEN = new ForeignCallDescriptor("multiplyToLen", void.class, Word.class, int.class, Word.class, int.class, Word.class, int.class);
 167 
 168     public static void multiplyToLenStub(Word xAddr, int xlen, Word yAddr, int ylen, Word zAddr, int zLen) {
 169         multiplyToLenStub(HotSpotBackend.MULTIPLY_TO_LEN, xAddr, xlen, yAddr, ylen, zAddr, zLen);
 170     }
 171 
 172     @NodeIntrinsic(ForeignCallNode.class)
 173     private static native void multiplyToLenStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word xIn, int xLen, Word yIn, int yLen, Word zIn, int zLen);
 174 
 175     /**
 176      * @see BigIntegerSubstitutions#mulAdd
 177      */
 178     public static final ForeignCallDescriptor MUL_ADD = new ForeignCallDescriptor("mulAdd", int.class, Word.class, Word.class, int.class, int.class, int.class);
 179 
 180     public static int mulAddStub(Word inAddr, Word outAddr, int newOffset, int len, int k) {
 181         return mulAddStub(HotSpotBackend.MUL_ADD, inAddr, outAddr, newOffset, len, k);
 182     }
 183 
 184     @NodeIntrinsic(ForeignCallNode.class)
 185     private static native int mulAddStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word inAddr, Word outAddr, int newOffset, int len, int k);
 186 
 187     /**
 188      * @see BigIntegerSubstitutions#implMontgomeryMultiply
 189      */
 190     public static final ForeignCallDescriptor MONTGOMERY_MULTIPLY = new ForeignCallDescriptor("implMontgomeryMultiply", void.class, Word.class, Word.class, Word.class, int.class, long.class,
 191                     Word.class);
 192 
 193     public static void implMontgomeryMultiply(Word aAddr, Word bAddr, Word nAddr, int len, long inv, Word productAddr) {
 194         implMontgomeryMultiply(HotSpotBackend.MONTGOMERY_MULTIPLY, aAddr, bAddr, nAddr, len, inv, productAddr);
 195     }
 196 
 197     @NodeIntrinsic(ForeignCallNode.class)
 198     private static native void implMontgomeryMultiply(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word aAddr, Word bAddr, Word nAddr, int len, long inv, Word productAddr);
 199 
 200     /**
 201      * @see BigIntegerSubstitutions#implMontgomerySquare
 202      */
 203     public static final ForeignCallDescriptor MONTGOMERY_SQUARE = new ForeignCallDescriptor("implMontgomerySquare", void.class, Word.class, Word.class, int.class, long.class, Word.class);
 204 
 205     public static void implMontgomerySquare(Word aAddr, Word nAddr, int len, long inv, Word productAddr) {
 206         implMontgomerySquare(HotSpotBackend.MONTGOMERY_SQUARE, aAddr, nAddr, len, inv, productAddr);
 207     }
 208 
 209     @NodeIntrinsic(ForeignCallNode.class)
 210     private static native void implMontgomerySquare(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word aAddr, Word nAddr, int len, long inv, Word productAddr);
 211 
 212     /**
 213      * @see BigIntegerSubstitutions#implSquareToLen
 214      */
 215     public static final ForeignCallDescriptor SQUARE_TO_LEN = new ForeignCallDescriptor("implSquareToLen", void.class, Word.class, int.class, Word.class, int.class);
 216 
 217     public static void implSquareToLen(Word xAddr, int len, Word zAddr, int zLen) {
 218         implSquareToLen(SQUARE_TO_LEN, xAddr, len, zAddr, zLen);
 219     }
 220 
 221     @NodeIntrinsic(ForeignCallNode.class)
 222     private static native void implSquareToLen(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word xAddr, int len, Word zAddr, int zLen);
 223 
 224     /**
 225      * @see SHASubstitutions#implCompress0
 226      */
 227     public static final ForeignCallDescriptor SHA_IMPL_COMPRESS = new ForeignCallDescriptor("shaImplCompress", void.class, Word.class, Object.class);
 228 
 229     public static void shaImplCompressStub(Word bufAddr, Object state) {
 230         shaImplCompressStub(HotSpotBackend.SHA_IMPL_COMPRESS, bufAddr, state);
 231     }
 232 
 233     @NodeIntrinsic(ForeignCallNode.class)
 234     private static native void shaImplCompressStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word bufAddr, Object state);
 235 
 236     /**
 237      * @see SHA2Substitutions#implCompress0
 238      */
 239     public static final ForeignCallDescriptor SHA2_IMPL_COMPRESS = new ForeignCallDescriptor("sha2ImplCompress", void.class, Word.class, Object.class);
 240 
 241     public static void sha2ImplCompressStub(Word bufAddr, Object state) {
 242         sha2ImplCompressStub(HotSpotBackend.SHA2_IMPL_COMPRESS, bufAddr, state);
 243     }
 244 
 245     @NodeIntrinsic(ForeignCallNode.class)
 246     private static native void sha2ImplCompressStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word bufAddr, Object state);
 247 
 248     /**
 249      * @see SHA5Substitutions#implCompress0
 250      */
 251     public static final ForeignCallDescriptor SHA5_IMPL_COMPRESS = new ForeignCallDescriptor("sha5ImplCompress", void.class, Word.class, Object.class);
 252 
 253     public static void sha5ImplCompressStub(Word bufAddr, Object state) {
 254         sha5ImplCompressStub(HotSpotBackend.SHA5_IMPL_COMPRESS, bufAddr, state);
 255     }
 256 
 257     @NodeIntrinsic(ForeignCallNode.class)
 258     private static native void sha5ImplCompressStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word bufAddr, Object state);
 259 
 260     /**
 261      * @see org.graalvm.compiler.hotspot.meta.HotSpotUnsafeSubstitutions#copyMemory
 262      */
 263     public static final ForeignCallDescriptor UNSAFE_ARRAYCOPY = new ForeignCallDescriptor("unsafe_arraycopy", void.class, Word.class, Word.class, Word.class);
 264 
 265     public static void unsafeArraycopy(Word srcAddr, Word dstAddr, Word size) {
 266         unsafeArraycopyStub(HotSpotBackend.UNSAFE_ARRAYCOPY, srcAddr, dstAddr, size);
 267     }
 268 


 269     @NodeIntrinsic(ForeignCallNode.class)
 270     private static native void unsafeArraycopyStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word srcAddr, Word dstAddr, Word size);
 271 
 272     /**
 273      * @see VMErrorNode
 274      */
 275     public static final ForeignCallDescriptor VM_ERROR = new ForeignCallDescriptor("vm_error", void.class, Object.class, Object.class, long.class);
 276 
 277     /**
 278      * New multi array stub call.
 279      */
 280     public static final ForeignCallDescriptor NEW_MULTI_ARRAY = new ForeignCallDescriptor("new_multi_array", Object.class, KlassPointer.class, int.class, Word.class);
 281 
 282     /**
 283      * New array stub.
 284      */
 285     public static final ForeignCallDescriptor NEW_ARRAY = new ForeignCallDescriptor("new_array", Object.class, KlassPointer.class, int.class, boolean.class);
 286 
 287     /**
 288      * New instance stub.
 289      */
 290     public static final ForeignCallDescriptor NEW_INSTANCE = new ForeignCallDescriptor("new_instance", Object.class, KlassPointer.class);
 291 
 292     /**
 293      * @see ResolveConstantStubCall
 294      */
 295     public static final ForeignCallDescriptor RESOLVE_STRING_BY_SYMBOL = new ForeignCallDescriptor("resolve_string_by_symbol", Object.class, Word.class, Word.class);
 296 
 297     /**
 298      * @see ResolveConstantStubCall
 299      */
 300     public static final ForeignCallDescriptor RESOLVE_DYNAMIC_INVOKE = new ForeignCallDescriptor("resolve_dynamic_invoke", Object.class, Word.class);
 301 
 302     /**
 303      * @see ResolveConstantStubCall
 304      */
 305     public static final ForeignCallDescriptor RESOLVE_KLASS_BY_SYMBOL = new ForeignCallDescriptor("resolve_klass_by_symbol", Word.class, Word.class, Word.class);
 306 
 307     /**
 308      * @see ResolveConstantStubCall
 309      */
 310     public static final ForeignCallDescriptor INITIALIZE_KLASS_BY_SYMBOL = new ForeignCallDescriptor("initialize_klass_by_symbol", Word.class, Word.class, Word.class);
 311 
 312     /**
 313      * @see ResolveConstantStubCall
 314      */
 315     public static final ForeignCallDescriptor RESOLVE_METHOD_BY_SYMBOL_AND_LOAD_COUNTERS = new ForeignCallDescriptor("resolve_method_by_symbol_and_load_counters", Word.class, Word.class, Word.class,
 316                     Word.class);
 317 
 318     /**
 319      * Tiered support.
 320      */
 321     public static final ForeignCallDescriptor INVOCATION_EVENT = new ForeignCallDescriptor("invocation_event", void.class, MethodCountersPointer.class);
 322     public static final ForeignCallDescriptor BACKEDGE_EVENT = new ForeignCallDescriptor("backedge_event", void.class, MethodCountersPointer.class, int.class, int.class);
 323 
 324     public HotSpotBackend(HotSpotGraalRuntimeProvider runtime, HotSpotProviders providers) {
 325         super(providers);
 326         this.runtime = runtime;
 327     }
 328 
 329     public HotSpotGraalRuntimeProvider getRuntime() {
 330         return runtime;
 331     }
 332 
 333     /**
 334      * Performs any remaining initialization that was deferred until the {@linkplain #getRuntime()
 335      * runtime} object was initialized and this backend was registered with it.
 336      *
 337      * @param jvmciRuntime
 338      * @param options
 339      */
 340     public void completeInitialization(HotSpotJVMCIRuntime jvmciRuntime, OptionValues options) {
 341     }
 342 
 343     /**
 344      * Finds all the registers that are defined by some given LIR.
 345      *
 346      * @param lir the LIR to examine
 347      * @return the registers that are defined by or used as temps for any instruction in {@code lir}
 348      */
 349     protected final EconomicSet<Register> gatherDestroyedCallerRegisters(LIR lir) {
 350         final EconomicSet<Register> destroyedRegisters = EconomicSet.create(Equivalence.IDENTITY);
 351         ValueConsumer defConsumer = new ValueConsumer() {
 352 
 353             @Override
 354             public void visitValue(Value value, OperandMode mode, EnumSet<OperandFlag> flags) {
 355                 if (ValueUtil.isRegister(value)) {
 356                     final Register reg = ValueUtil.asRegister(value);
 357                     destroyedRegisters.add(reg);
 358                 }
 359             }
 360         };
 361         for (AbstractBlockBase<?> block : lir.codeEmittingOrder()) {
 362             if (block == null) {
 363                 continue;
 364             }
 365             for (LIRInstruction op : lir.getLIRforBlock(block)) {
 366                 if (op instanceof LabelOp) {
 367                     // Don't consider this as a definition
 368                 } else {
 369                     op.visitEachTemp(defConsumer);
 370                     op.visitEachOutput(defConsumer);
 371                 }
 372             }
 373         }
 374         return translateToCallerRegisters(destroyedRegisters);
 375     }
 376 
 377     /**
 378      * Updates a given stub with respect to the registers it destroys.
 379      * <p>
 380      * Any entry in {@code calleeSaveInfo} that {@linkplain SaveRegistersOp#supportsRemove()
 381      * supports} pruning will have {@code destroyedRegisters}
 382      * {@linkplain SaveRegistersOp#remove(EconomicSet) removed} as these registers are declared as
 383      * temporaries in the stub's {@linkplain ForeignCallLinkage linkage} (and thus will be saved by
 384      * the stub's caller).
 385      *
 386      * @param stub the stub to update
 387      * @param destroyedRegisters the registers destroyed by the stub
 388      * @param calleeSaveInfo a map from debug infos to the operations that provide their
 389      *            {@linkplain RegisterSaveLayout callee-save information}
 390      * @param frameMap used to {@linkplain FrameMap#offsetForStackSlot(StackSlot) convert} a virtual
 391      *            slot to a frame slot index
 392      */
 393     protected void updateStub(Stub stub, EconomicSet<Register> destroyedRegisters, EconomicMap<LIRFrameState, SaveRegistersOp> calleeSaveInfo, FrameMap frameMap) {
 394         stub.initDestroyedCallerRegisters(destroyedRegisters);
 395 
 396         MapCursor<LIRFrameState, SaveRegistersOp> cursor = calleeSaveInfo.getEntries();
 397         while (cursor.advance()) {
 398             SaveRegistersOp save = cursor.getValue();
 399             if (save.supportsRemove()) {
 400                 save.remove(destroyedRegisters);
 401             }
 402             if (cursor.getKey() != LIRFrameState.NO_STATE) {
 403                 cursor.getKey().debugInfo().setCalleeSaveInfo(save.getMap(frameMap));
 404             }
 405         }
 406     }
 407 
 408     @Override
 409     public HotSpotProviders getProviders() {
 410         return (HotSpotProviders) super.getProviders();
 411     }
 412 
 413     @Override
 414     public SuitesProvider getSuites() {
 415         return getProviders().getSuites();
 416     }
 417 
 418     protected void profileInstructions(LIR lir, CompilationResultBuilder crb) {
 419         if (HotSpotBackend.Options.ASMInstructionProfiling.getValue(lir.getOptions()) != null) {
 420             HotSpotInstructionProfiling.countInstructions(lir, crb.asm);
 421         }
 422     }
 423 
 424     @Override
 425     public CompiledCode createCompiledCode(ResolvedJavaMethod method, CompilationRequest compilationRequest, CompilationResult compResult) {
 426         HotSpotCompilationRequest compRequest = compilationRequest instanceof HotSpotCompilationRequest ? (HotSpotCompilationRequest) compilationRequest : null;
 427         return HotSpotCompiledCodeBuilder.createCompiledCode(getCodeCache(), method, compRequest, compResult);
 428     }
 429 
 430     @Override
 431     public CompilationIdentifier getCompilationIdentifier(ResolvedJavaMethod resolvedJavaMethod) {
 432         if (resolvedJavaMethod instanceof HotSpotResolvedJavaMethod) {
 433             HotSpotCompilationRequest request = new HotSpotCompilationRequest((HotSpotResolvedJavaMethod) resolvedJavaMethod, JVMCICompiler.INVOCATION_ENTRY_BCI, 0L);
 434             return new HotSpotCompilationIdentifier(request);
 435         }
 436         return super.getCompilationIdentifier(resolvedJavaMethod);
 437     }
 438 }
--- EOF ---