Mercurial > hg > truffle
view graal/com.oracle.graal.hotspot.amd64/src/com/oracle/graal/hotspot/amd64/AMD64HotSpotLIRGenerator.java @ 18490:ca81508f2a19
Generalize NULL handling to work on arbitrary pointers.
author | Roland Schatz <roland.schatz@oracle.com> |
---|---|
date | Mon, 24 Nov 2014 13:53:14 +0100 |
parents | f91e40c4bb47 |
children | be44c1ca8f00 |
line wrap: on
line source
/* * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.hotspot.amd64; import static com.oracle.graal.amd64.AMD64.*; import static com.oracle.graal.api.code.ValueUtil.*; import static com.oracle.graal.hotspot.HotSpotBackend.*; import static com.oracle.graal.hotspot.HotSpotGraalRuntime.*; import java.util.*; import com.oracle.graal.amd64.*; import com.oracle.graal.api.code.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.compiler.amd64.*; import com.oracle.graal.compiler.common.*; import com.oracle.graal.compiler.common.calc.*; import com.oracle.graal.compiler.common.spi.*; import com.oracle.graal.hotspot.*; import com.oracle.graal.hotspot.HotSpotVMConfig.CompressEncoding; import com.oracle.graal.hotspot.amd64.AMD64HotSpotMove.HotSpotStoreConstantOp; import com.oracle.graal.hotspot.meta.*; import com.oracle.graal.hotspot.stubs.*; import com.oracle.graal.lir.*; import com.oracle.graal.lir.StandardOp.NoOp; import com.oracle.graal.lir.StandardOp.SaveRegistersOp; import com.oracle.graal.lir.amd64.*; import com.oracle.graal.lir.amd64.AMD64ControlFlow.CondMoveOp; import com.oracle.graal.lir.amd64.AMD64Move.CompareAndSwapOp; import com.oracle.graal.lir.amd64.AMD64Move.LeaDataOp; import com.oracle.graal.lir.amd64.AMD64Move.LoadOp; import com.oracle.graal.lir.amd64.AMD64Move.MoveFromRegOp; import com.oracle.graal.lir.amd64.AMD64Move.StoreOp; import com.oracle.graal.lir.gen.*; import com.oracle.graal.phases.util.*; /** * LIR generator specialized for AMD64 HotSpot. */ public class AMD64HotSpotLIRGenerator extends AMD64LIRGenerator implements HotSpotLIRGenerator { final HotSpotVMConfig config; private HotSpotLockStack lockStack; protected AMD64HotSpotLIRGenerator(HotSpotProviders providers, HotSpotVMConfig config, CallingConvention cc, LIRGenerationResult lirGenRes) { this(new DefaultLIRKindTool(providers.getCodeCache().getTarget().wordKind), providers, config, cc, lirGenRes); } protected AMD64HotSpotLIRGenerator(LIRKindTool lirKindTool, HotSpotProviders providers, HotSpotVMConfig config, CallingConvention cc, LIRGenerationResult lirGenRes) { super(lirKindTool, providers, cc, lirGenRes); assert config.basicLockSize == 8; this.config = config; } @Override public HotSpotProviders getProviders() { return (HotSpotProviders) super.getProviders(); } /** * Utility for emitting the instruction to save RBP. */ class SaveRbp { final NoOp placeholder; /** * The slot reserved for saving RBP. */ final StackSlot reservedSlot; public SaveRbp(NoOp placeholder) { this.placeholder = placeholder; AMD64FrameMapBuilder frameMapBuilder = (AMD64FrameMapBuilder) getResult().getFrameMapBuilder(); this.reservedSlot = frameMapBuilder.allocateRBPSpillSlot(); } /** * Replaces this operation with the appropriate move for saving rbp. * * @param useStack specifies if rbp must be saved to the stack */ public AllocatableValue finalize(boolean useStack) { AllocatableValue dst; if (useStack) { dst = reservedSlot; } else { ((AMD64FrameMapBuilder) getResult().getFrameMapBuilder()).freeRBPSpillSlot(); dst = newVariable(LIRKind.value(Kind.Long)); } placeholder.replace(getResult().getLIR(), new MoveFromRegOp(Kind.Long, dst, rbp.asValue(LIRKind.value(Kind.Long)))); return dst; } } SaveRbp saveRbp; /** * List of epilogue operations that need to restore RBP. */ List<AMD64HotSpotEpilogueOp> epilogueOps = new ArrayList<>(2); @Override public void append(LIRInstruction op) { super.append(op); if (op instanceof AMD64HotSpotEpilogueOp) { epilogueOps.add((AMD64HotSpotEpilogueOp) op); } } @Override public StackSlotValue getLockSlot(int lockDepth) { return getLockStack().makeLockSlot(lockDepth); } private HotSpotLockStack getLockStack() { assert lockStack != null; return lockStack; } protected void setLockStack(HotSpotLockStack lockStack) { assert this.lockStack == null; this.lockStack = lockStack; } private Register findPollOnReturnScratchRegister() { RegisterConfig regConfig = getProviders().getCodeCache().getRegisterConfig(); for (Register r : regConfig.getAllocatableRegisters(Kind.Long)) { if (!r.equals(regConfig.getReturnRegister(Kind.Long)) && !r.equals(AMD64.rbp)) { return r; } } throw GraalInternalError.shouldNotReachHere(); } private Register pollOnReturnScratchRegister; @Override public void emitReturn(Value input) { AllocatableValue operand = Value.ILLEGAL; if (input != null) { operand = resultOperandFor(input.getLIRKind()); emitMove(operand, input); } if (pollOnReturnScratchRegister == null) { pollOnReturnScratchRegister = findPollOnReturnScratchRegister(); } append(new AMD64HotSpotReturnOp(operand, getStub() != null, pollOnReturnScratchRegister)); } @Override public boolean needOnlyOopMaps() { // Stubs only need oop maps return ((AMD64HotSpotLIRGenerationResult) getResult()).getStub() != null; } @Override public void emitData(AllocatableValue dst, byte[] data) { append(new LeaDataOp(dst, data)); } private LIRFrameState currentRuntimeCallInfo; @Override protected void emitForeignCall(ForeignCallLinkage linkage, Value result, Value[] arguments, Value[] temps, LIRFrameState info) { currentRuntimeCallInfo = info; super.emitForeignCall(linkage, result, arguments, temps, info); } public void emitLeaveCurrentStackFrame(SaveRegistersOp saveRegisterOp) { append(new AMD64HotSpotLeaveCurrentStackFrameOp(saveRegisterOp)); } public void emitLeaveDeoptimizedStackFrame(Value frameSize, Value initialInfo) { Variable frameSizeVariable = load(frameSize); Variable initialInfoVariable = load(initialInfo); append(new AMD64HotSpotLeaveDeoptimizedStackFrameOp(frameSizeVariable, initialInfoVariable)); } public void emitEnterUnpackFramesStackFrame(Value framePc, Value senderSp, Value senderFp, SaveRegistersOp saveRegisterOp) { Register threadRegister = getProviders().getRegisters().getThreadRegister(); Variable framePcVariable = load(framePc); Variable senderSpVariable = load(senderSp); Variable senderFpVariable = load(senderFp); append(new AMD64HotSpotEnterUnpackFramesStackFrameOp(threadRegister, config.threadLastJavaSpOffset(), config.threadLastJavaPcOffset(), config.threadLastJavaFpOffset(), framePcVariable, senderSpVariable, senderFpVariable, saveRegisterOp)); } public void emitLeaveUnpackFramesStackFrame(SaveRegistersOp saveRegisterOp) { Register threadRegister = getProviders().getRegisters().getThreadRegister(); append(new AMD64HotSpotLeaveUnpackFramesStackFrameOp(threadRegister, config.threadLastJavaSpOffset(), config.threadLastJavaPcOffset(), config.threadLastJavaFpOffset(), saveRegisterOp)); } /** * @param savedRegisters the registers saved by this operation which may be subject to pruning * @param savedRegisterLocations the slots to which the registers are saved * @param supportsRemove determines if registers can be pruned */ protected AMD64SaveRegistersOp emitSaveRegisters(Register[] savedRegisters, StackSlotValue[] savedRegisterLocations, boolean supportsRemove) { AMD64SaveRegistersOp save = new AMD64SaveRegistersOp(savedRegisters, savedRegisterLocations, supportsRemove); append(save); return save; } /** * Adds a node to the graph that saves all allocatable registers to the stack. * * @param supportsRemove determines if registers can be pruned * @return the register save node */ private AMD64SaveRegistersOp emitSaveAllRegisters(Register[] savedRegisters, boolean supportsRemove) { StackSlotValue[] savedRegisterLocations = new StackSlotValue[savedRegisters.length]; for (int i = 0; i < savedRegisters.length; i++) { PlatformKind kind = target().arch.getLargestStorableKind(savedRegisters[i].getRegisterCategory()); assert kind != Kind.Illegal; VirtualStackSlot spillSlot = getResult().getFrameMapBuilder().allocateSpillSlot(LIRKind.value(kind)); savedRegisterLocations[i] = spillSlot; } return emitSaveRegisters(savedRegisters, savedRegisterLocations, supportsRemove); } @Override public SaveRegistersOp emitSaveAllRegisters() { // We are saving all registers. // TODO Save upper half of YMM registers. return emitSaveAllRegisters(cpuxmmRegisters, false); } protected void emitRestoreRegisters(AMD64SaveRegistersOp save) { append(new AMD64RestoreRegistersOp(save.getSlots().clone(), save)); } public Stub getStub() { return ((AMD64HotSpotLIRGenerationResult) getResult()).getStub(); } @Override public Variable emitForeignCall(ForeignCallLinkage linkage, LIRFrameState state, Value... args) { HotSpotForeignCallLinkage hotspotLinkage = (HotSpotForeignCallLinkage) linkage; boolean destroysRegisters = hotspotLinkage.destroysRegisters(); AMD64SaveRegistersOp save = null; if (destroysRegisters) { if (getStub() != null) { if (getStub().preservesRegisters()) { Register[] savedRegisters = getResult().getFrameMapBuilder().getRegisterConfig().getAllocatableRegisters(); save = emitSaveAllRegisters(savedRegisters, true); } } } Variable result; // TODO (je) check if we can remove this LIRFrameState deoptInfo = null; if (hotspotLinkage.canDeoptimize()) { deoptInfo = state; assert deoptInfo != null || getStub() != null; assert hotspotLinkage.needsJavaFrameAnchor(); } if (hotspotLinkage.needsJavaFrameAnchor()) { Register thread = getProviders().getRegisters().getThreadRegister(); append(new AMD64HotSpotCRuntimeCallPrologueOp(config.threadLastJavaSpOffset(), thread)); result = super.emitForeignCall(hotspotLinkage, deoptInfo, args); append(new AMD64HotSpotCRuntimeCallEpilogueOp(config.threadLastJavaSpOffset(), config.threadLastJavaFpOffset(), thread)); } else { assert deoptInfo == null; result = super.emitForeignCall(hotspotLinkage, null, args); } if (destroysRegisters) { if (getStub() != null) { if (getStub().preservesRegisters()) { AMD64HotSpotLIRGenerationResult generationResult = (AMD64HotSpotLIRGenerationResult) getResult(); assert !generationResult.getCalleeSaveInfo().containsKey(currentRuntimeCallInfo); generationResult.getCalleeSaveInfo().put(currentRuntimeCallInfo, save); emitRestoreRegisters(save); } else { assert zapRegisters(); } } } return result; } public Value emitUncommonTrapCall(Value trapRequest, SaveRegistersOp saveRegisterOp) { ForeignCallLinkage linkage = getForeignCalls().lookupForeignCall(UNCOMMON_TRAP); Register thread = getProviders().getRegisters().getThreadRegister(); append(new AMD64HotSpotCRuntimeCallPrologueOp(config.threadLastJavaSpOffset(), thread)); Variable result = super.emitForeignCall(linkage, null, thread.asValue(LIRKind.value(Kind.Long)), trapRequest); append(new AMD64HotSpotCRuntimeCallEpilogueOp(config.threadLastJavaSpOffset(), config.threadLastJavaFpOffset(), thread)); Map<LIRFrameState, SaveRegistersOp> calleeSaveInfo = ((AMD64HotSpotLIRGenerationResult) getResult()).getCalleeSaveInfo(); assert !calleeSaveInfo.containsKey(currentRuntimeCallInfo); calleeSaveInfo.put(currentRuntimeCallInfo, saveRegisterOp); return result; } public Value emitDeoptimizationFetchUnrollInfoCall(SaveRegistersOp saveRegisterOp) { ForeignCallLinkage linkage = getForeignCalls().lookupForeignCall(FETCH_UNROLL_INFO); Register thread = getProviders().getRegisters().getThreadRegister(); append(new AMD64HotSpotCRuntimeCallPrologueOp(config.threadLastJavaSpOffset(), thread)); Variable result = super.emitForeignCall(linkage, null, thread.asValue(LIRKind.value(Kind.Long))); append(new AMD64HotSpotCRuntimeCallEpilogueOp(config.threadLastJavaSpOffset(), config.threadLastJavaFpOffset(), thread)); Map<LIRFrameState, SaveRegistersOp> calleeSaveInfo = ((AMD64HotSpotLIRGenerationResult) getResult()).getCalleeSaveInfo(); assert !calleeSaveInfo.containsKey(currentRuntimeCallInfo); calleeSaveInfo.put(currentRuntimeCallInfo, saveRegisterOp); return result; } protected AMD64ZapRegistersOp emitZapRegisters(Register[] zappedRegisters, JavaConstant[] zapValues) { AMD64ZapRegistersOp zap = new AMD64ZapRegistersOp(zappedRegisters, zapValues); append(zap); return zap; } protected boolean zapRegisters() { Register[] zappedRegisters = getResult().getFrameMapBuilder().getRegisterConfig().getAllocatableRegisters(); JavaConstant[] zapValues = new JavaConstant[zappedRegisters.length]; for (int i = 0; i < zappedRegisters.length; i++) { PlatformKind kind = target().arch.getLargestStorableKind(zappedRegisters[i].getRegisterCategory()); assert kind != Kind.Illegal; zapValues[i] = zapValueForKind(kind); } ((AMD64HotSpotLIRGenerationResult) getResult()).getCalleeSaveInfo().put(currentRuntimeCallInfo, emitZapRegisters(zappedRegisters, zapValues)); return true; } @Override public void emitTailcall(Value[] args, Value address) { append(new AMD64TailcallOp(args, address)); } @Override public void emitCCall(long address, CallingConvention nativeCallingConvention, Value[] args, int numberOfFloatingPointArguments) { Value[] argLocations = new Value[args.length]; getResult().getFrameMapBuilder().callsMethod(nativeCallingConvention); // TODO(mg): in case a native function uses floating point varargs, the ABI requires that // RAX contains the length of the varargs AllocatableValue numberOfFloatingPointArgumentsRegister = AMD64.rax.asValue(); emitMove(numberOfFloatingPointArgumentsRegister, JavaConstant.forInt(numberOfFloatingPointArguments)); for (int i = 0; i < args.length; i++) { Value arg = args[i]; AllocatableValue loc = nativeCallingConvention.getArgument(i); emitMove(loc, arg); argLocations[i] = loc; } Value ptr = emitMove(JavaConstant.forLong(address)); append(new AMD64CCall(nativeCallingConvention.getReturn(), ptr, numberOfFloatingPointArgumentsRegister, argLocations)); } @Override public void emitUnwind(Value exception) { ForeignCallLinkage linkage = getForeignCalls().lookupForeignCall(HotSpotBackend.UNWIND_EXCEPTION_TO_CALLER); CallingConvention outgoingCc = linkage.getOutgoingCallingConvention(); assert outgoingCc.getArgumentCount() == 2; RegisterValue exceptionParameter = (RegisterValue) outgoingCc.getArgument(0); emitMove(exceptionParameter, exception); append(new AMD64HotSpotUnwindOp(exceptionParameter)); } private void moveDeoptValuesToThread(Value actionAndReason, Value speculation) { moveValueToThread(actionAndReason, runtime().getConfig().pendingDeoptimizationOffset); moveValueToThread(speculation, runtime().getConfig().pendingFailedSpeculationOffset); } private void moveValueToThread(Value v, int offset) { LIRKind wordKind = LIRKind.value(getProviders().getCodeCache().getTarget().wordKind); RegisterValue thread = getProviders().getRegisters().getThreadRegister().asValue(wordKind); AMD64AddressValue address = new AMD64AddressValue(wordKind, thread, offset); emitStore(v.getLIRKind(), address, v, null); } @Override public void emitDeoptimize(Value actionAndReason, Value speculation, LIRFrameState state) { moveDeoptValuesToThread(actionAndReason, speculation); append(new AMD64DeoptimizeOp(state)); } @Override public void emitDeoptimizeCaller(DeoptimizationAction action, DeoptimizationReason reason) { moveDeoptValuesToThread(getMetaAccess().encodeDeoptActionAndReason(action, reason, 0), JavaConstant.NULL_POINTER); append(new AMD64HotSpotDeoptimizeCallerOp()); } @Override public void beforeRegisterAllocation() { super.beforeRegisterAllocation(); boolean hasDebugInfo = getResult().getLIR().hasDebugInfo(); AllocatableValue savedRbp = saveRbp.finalize(hasDebugInfo); if (hasDebugInfo) { ((AMD64HotSpotLIRGenerationResult) getResult()).setDeoptimizationRescueSlot(((AMD64FrameMapBuilder) getResult().getFrameMapBuilder()).allocateDeoptimizationRescueSlot()); } for (AMD64HotSpotEpilogueOp op : epilogueOps) { op.savedRbp = savedRbp; } } private static LIRKind toStackKind(LIRKind kind) { if (kind.getPlatformKind() instanceof Kind) { Kind stackKind = ((Kind) kind.getPlatformKind()).getStackKind(); return kind.changeType(stackKind); } else { return kind; } } public void emitPushInterpreterFrame(Value frameSize, Value framePc, Value senderSp, Value initialInfo) { Variable frameSizeVariable = load(frameSize); Variable framePcVariable = load(framePc); Variable senderSpVariable = load(senderSp); Variable initialInfoVariable = load(initialInfo); append(new AMD64HotSpotPushInterpreterFrameOp(frameSizeVariable, framePcVariable, senderSpVariable, initialInfoVariable)); } @Override public Variable emitLoad(LIRKind kind, Value address, LIRFrameState state) { AMD64AddressValue loadAddress = asAddressValue(address); Variable result = newVariable(toStackKind(kind)); append(new LoadOp((Kind) kind.getPlatformKind(), result, loadAddress, state)); return result; } /** * Checks whether the supplied constant can be used without loading it into a register for store * operations, i.e., on the right hand side of a memory access. * * @param c The constant to check. * @return True if the constant can be used directly, false if the constant needs to be in a * register. */ protected boolean canStoreConstant(JavaConstant c) { // there is no immediate move of 64-bit constants on Intel switch (c.getKind()) { case Long: return Util.isInt(c.asLong()) && !getCodeCache().needsDataPatch(c); case Double: return false; case Object: return c.isNull(); default: return true; } } @Override public void emitStore(LIRKind kind, Value address, Value inputVal, LIRFrameState state) { AMD64AddressValue storeAddress = asAddressValue(address); if (isConstant(inputVal)) { JavaConstant c = asConstant(inputVal); if (canStoreConstant(c)) { append(new HotSpotStoreConstantOp((Kind) kind.getPlatformKind(), storeAddress, c, state)); return; } } Variable input = load(inputVal); append(new StoreOp((Kind) kind.getPlatformKind(), storeAddress, input, state)); } @Override public Value emitCompress(Value pointer, CompressEncoding encoding, boolean nonNull) { LIRKind inputKind = pointer.getLIRKind(); assert inputKind.getPlatformKind() == Kind.Long || inputKind.getPlatformKind() == Kind.Object; if (inputKind.isReference(0)) { // oop Variable result = newVariable(LIRKind.reference(Kind.Int)); append(new AMD64HotSpotMove.CompressPointer(result, asAllocatable(pointer), getProviders().getRegisters().getHeapBaseRegister().asValue(), encoding, nonNull)); return result; } else { // metaspace pointer Variable result = newVariable(LIRKind.value(Kind.Int)); AllocatableValue base = Value.ILLEGAL; if (encoding.base != 0) { base = emitMove(JavaConstant.forLong(encoding.base)); } append(new AMD64HotSpotMove.CompressPointer(result, asAllocatable(pointer), base, encoding, nonNull)); return result; } } @Override public Value emitUncompress(Value pointer, CompressEncoding encoding, boolean nonNull) { LIRKind inputKind = pointer.getLIRKind(); assert inputKind.getPlatformKind() == Kind.Int; if (inputKind.isReference(0)) { // oop Variable result = newVariable(LIRKind.reference(Kind.Object)); append(new AMD64HotSpotMove.UncompressPointer(result, asAllocatable(pointer), getProviders().getRegisters().getHeapBaseRegister().asValue(), encoding, nonNull)); return result; } else { // metaspace pointer Variable result = newVariable(LIRKind.value(Kind.Long)); AllocatableValue base = Value.ILLEGAL; if (encoding.base != 0) { base = emitMove(JavaConstant.forLong(encoding.base)); } append(new AMD64HotSpotMove.UncompressPointer(result, asAllocatable(pointer), base, encoding, nonNull)); return result; } } @Override protected AMD64LIRInstruction createMove(AllocatableValue dst, Value src) { if (src instanceof JavaConstant) { return new AMD64HotSpotMove.HotSpotLoadConstantOp(dst, (JavaConstant) src); } else { return super.createMove(dst, src); } } public Value emitCompareAndSwap(Value address, Value expectedValue, Value newValue, Value trueValue, Value falseValue) { LIRKind kind = newValue.getLIRKind(); assert kind.equals(expectedValue.getLIRKind()); Kind memKind = (Kind) kind.getPlatformKind(); AMD64AddressValue addressValue = asAddressValue(address); RegisterValue raxRes = AMD64.rax.asValue(kind); emitMove(raxRes, expectedValue); append(new CompareAndSwapOp(memKind, raxRes, addressValue, raxRes, asAllocatable(newValue))); assert trueValue.getLIRKind().equals(falseValue.getLIRKind()); Variable result = newVariable(trueValue.getLIRKind()); append(new CondMoveOp(result, Condition.EQ, asAllocatable(trueValue), falseValue)); return result; } public Value emitAtomicReadAndAdd(Value address, Value delta) { LIRKind kind = delta.getLIRKind(); Kind memKind = (Kind) kind.getPlatformKind(); Variable result = newVariable(kind); AMD64AddressValue addressValue = asAddressValue(address); append(new AMD64Move.AtomicReadAndAddOp(memKind, result, addressValue, asAllocatable(delta))); return result; } public Value emitAtomicReadAndWrite(Value address, Value newValue) { LIRKind kind = newValue.getLIRKind(); Kind memKind = (Kind) kind.getPlatformKind(); Variable result = newVariable(kind); AMD64AddressValue addressValue = asAddressValue(address); append(new AMD64Move.AtomicReadAndWriteOp(memKind, result, addressValue, asAllocatable(newValue))); return result; } public void emitNullCheck(Value address, LIRFrameState state) { if (address.getLIRKind().getPlatformKind() == Kind.Int) { CompressEncoding encoding = config.getOopEncoding(); if (encoding.shift <= 3) { AMD64AddressValue uncompressionAddress = emitAddress(getProviders().getRegisters().getHeapBaseRegister().asValue(), 0, load(address), 1 << encoding.shift); append(new AMD64HotSpotMove.CompressedNullCheckOp(uncompressionAddress, state)); } else { Value uncompress = emitUncompress(address, encoding, false); append(new AMD64Move.NullCheckOp(load(uncompress), state)); } } else { assert address.getKind() == Kind.Object || address.getKind() == Kind.Long : address + " - " + address.getKind() + " not a pointer!"; append(new AMD64Move.NullCheckOp(load(address), state)); } } @Override protected void emitCompareOp(PlatformKind cmpKind, Variable left, Value right) { if (right instanceof HotSpotConstant) { append(new AMD64HotSpotCompare.HotSpotCompareConstantOp(left, (JavaConstant) right)); } else { super.emitCompareOp(cmpKind, left, right); } } @Override protected void emitCompareMemoryConOp(Kind kind, AMD64AddressValue address, JavaConstant value, LIRFrameState state) { if (value instanceof HotSpotConstant) { append(new AMD64HotSpotCompare.HotSpotCompareMemoryConstantOp(kind, address, value, state)); } else { super.emitCompareMemoryConOp(kind, address, value, state); } } @Override public boolean canInlineConstant(JavaConstant c) { if (HotSpotCompressedNullConstant.COMPRESSED_NULL.equals(c)) { return true; } else if (c instanceof HotSpotObjectConstant) { return ((HotSpotObjectConstant) c).isCompressed(); } else { return super.canInlineConstant(c); } } }