| /* |
| * Copyright (C) 2020 Igalia, S.L. All rights reserved. |
| * Copyright (C) 2020 Metrological Group B.V. |
| * Copyright (C) 2008-2019 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| |
| #if ENABLE(JIT) |
| #if USE(JSVALUE32_64) |
| #include "JIT.h" |
| |
| #include "CacheableIdentifierInlines.h" |
| #include "CodeBlock.h" |
| #include "Interpreter.h" |
| #include "JITInlines.h" |
| #include "JSArray.h" |
| #include "JSFunction.h" |
| #include "JSCInlines.h" |
| #include "LinkBuffer.h" |
| #include "OpcodeInlines.h" |
| #include "ResultType.h" |
| #include "SetupVarargsFrame.h" |
| #include "SlowPathCall.h" |
| #include "StackAlignment.h" |
| #include "ThunkGenerators.h" |
| #include <wtf/StringPrintStream.h> |
| |
| namespace JSC { |
| |
| template<typename Op> |
| void JIT::emitPutCallResult(const Op& bytecode) |
| { |
| emitValueProfilingSite(bytecode, JSValueRegs(regT1, regT0)); |
| emitStore(destinationFor(bytecode, m_bytecodeIndex.checkpoint()).virtualRegister(), regT1, regT0); |
| } |
| |
| void JIT::emit_op_ret(const Instruction* currentInstruction) |
| { |
| auto bytecode = currentInstruction->as<OpRet>(); |
| VirtualRegister value = bytecode.m_value; |
| |
| emitLoad(value, regT1, regT0); |
| |
| checkStackPointerAlignment(); |
| emitRestoreCalleeSaves(); |
| emitFunctionEpilogue(); |
| ret(); |
| } |
| |
| void JIT::emitSlow_op_call(const Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter) |
| { |
| compileOpCallSlowCase<OpCall>(currentInstruction, iter, m_callLinkInfoIndex++); |
| } |
| |
| void JIT::emitSlow_op_tail_call(const Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter) |
| { |
| compileOpCallSlowCase<OpTailCall>(currentInstruction, iter, m_callLinkInfoIndex++); |
| } |
| |
| void JIT::emitSlow_op_call_eval(const Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter) |
| { |
| compileOpCallSlowCase<OpCallEval>(currentInstruction, iter, m_callLinkInfoIndex); |
| } |
| |
| void JIT::emitSlow_op_call_varargs(const Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter) |
| { |
| compileOpCallSlowCase<OpCallVarargs>(currentInstruction, iter, m_callLinkInfoIndex++); |
| } |
| |
| void JIT::emitSlow_op_tail_call_varargs(const Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter) |
| { |
| compileOpCallSlowCase<OpTailCallVarargs>(currentInstruction, iter, m_callLinkInfoIndex++); |
| } |
| |
| void JIT::emitSlow_op_tail_call_forward_arguments(const Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter) |
| { |
| compileOpCallSlowCase<OpTailCallForwardArguments>(currentInstruction, iter, m_callLinkInfoIndex++); |
| } |
| |
| void JIT::emitSlow_op_construct_varargs(const Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter) |
| { |
| compileOpCallSlowCase<OpConstructVarargs>(currentInstruction, iter, m_callLinkInfoIndex++); |
| } |
| |
| void JIT::emitSlow_op_construct(const Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter) |
| { |
| compileOpCallSlowCase<OpConstruct>(currentInstruction, iter, m_callLinkInfoIndex++); |
| } |
| |
| void JIT::emit_op_call(const Instruction* currentInstruction) |
| { |
| compileOpCall<OpCall>(currentInstruction, m_callLinkInfoIndex++); |
| } |
| |
| void JIT::emit_op_tail_call(const Instruction* currentInstruction) |
| { |
| compileOpCall<OpTailCall>(currentInstruction, m_callLinkInfoIndex++); |
| } |
| |
| void JIT::emit_op_call_eval(const Instruction* currentInstruction) |
| { |
| compileOpCall<OpCallEval>(currentInstruction, m_callLinkInfoIndex); |
| } |
| |
| void JIT::emit_op_call_varargs(const Instruction* currentInstruction) |
| { |
| compileOpCall<OpCallVarargs>(currentInstruction, m_callLinkInfoIndex++); |
| } |
| |
| void JIT::emit_op_tail_call_varargs(const Instruction* currentInstruction) |
| { |
| compileOpCall<OpTailCallVarargs>(currentInstruction, m_callLinkInfoIndex++); |
| } |
| |
| void JIT::emit_op_tail_call_forward_arguments(const Instruction* currentInstruction) |
| { |
| compileOpCall<OpTailCallForwardArguments>(currentInstruction, m_callLinkInfoIndex++); |
| } |
| |
| void JIT::emit_op_construct_varargs(const Instruction* currentInstruction) |
| { |
| compileOpCall<OpConstructVarargs>(currentInstruction, m_callLinkInfoIndex++); |
| } |
| |
| void JIT::emit_op_construct(const Instruction* currentInstruction) |
| { |
| compileOpCall<OpConstruct>(currentInstruction, m_callLinkInfoIndex++); |
| } |
| |
| template <typename Op> |
| std::enable_if_t< |
| Op::opcodeID != op_call_varargs && Op::opcodeID != op_construct_varargs |
| && Op::opcodeID != op_tail_call_varargs && Op::opcodeID != op_tail_call_forward_arguments |
| , void> |
| JIT::compileSetupFrame(const Op& bytecode, CallLinkInfo*) |
| { |
| unsigned checkpoint = m_bytecodeIndex.checkpoint(); |
| int argCount = argumentCountIncludingThisFor(bytecode, checkpoint); |
| int registerOffset = -static_cast<int>(stackOffsetInRegistersForCall(bytecode, checkpoint)); |
| |
| if (Op::opcodeID == op_call && shouldEmitProfiling()) { |
| emitLoad(VirtualRegister(registerOffset + CallFrame::argumentOffsetIncludingThis(0)), regT0, regT1); |
| Jump done = branchIfNotCell(regT0); |
| load32(Address(regT1, JSCell::structureIDOffset()), regT0); |
| store32ToMetadata(regT0, bytecode, OpCall::Metadata::offsetOfCallLinkInfo() + LLIntCallLinkInfo::offsetOfArrayProfile() + ArrayProfile::offsetOfLastSeenStructureID()); |
| done.link(this); |
| } |
| |
| addPtr(TrustedImm32(registerOffset * sizeof(Register) + sizeof(CallerFrameAndPC)), callFrameRegister, stackPointerRegister); |
| store32(TrustedImm32(argCount), Address(stackPointerRegister, CallFrameSlot::argumentCountIncludingThis * static_cast<int>(sizeof(Register)) + PayloadOffset - sizeof(CallerFrameAndPC))); |
| } |
| |
| template<typename Op> |
| std::enable_if_t< |
| Op::opcodeID == op_call_varargs || Op::opcodeID == op_construct_varargs |
| || Op::opcodeID == op_tail_call_varargs || Op::opcodeID == op_tail_call_forward_arguments |
| , void> |
| JIT::compileSetupFrame(const Op& bytecode, CallLinkInfo* info) |
| { |
| OpcodeID opcodeID = Op::opcodeID; |
| VirtualRegister thisValue = bytecode.m_thisValue; |
| VirtualRegister arguments = bytecode.m_arguments; |
| int firstFreeRegister = bytecode.m_firstFree.offset(); |
| int firstVarArgOffset = bytecode.m_firstVarArg; |
| |
| emitLoad(arguments, regT1, regT0); |
| Z_JITOperation_GJZZ sizeOperation; |
| if (Op::opcodeID == op_tail_call_forward_arguments) |
| sizeOperation = operationSizeFrameForForwardArguments; |
| else |
| sizeOperation = operationSizeFrameForVarargs; |
| callOperation(sizeOperation, m_profiledCodeBlock->globalObject(), JSValueRegs(regT1, regT0), -firstFreeRegister, firstVarArgOffset); |
| move(TrustedImm32(-firstFreeRegister), regT1); |
| emitSetVarargsFrame(*this, returnValueGPR, false, regT1, regT1); |
| addPtr(TrustedImm32(-(sizeof(CallerFrameAndPC) + WTF::roundUpToMultipleOf(stackAlignmentBytes(), 6 * sizeof(void*)))), regT1, stackPointerRegister); |
| emitLoad(arguments, regT2, regT4); |
| F_JITOperation_GFJZZ setupOperation; |
| if (opcodeID == op_tail_call_forward_arguments) |
| setupOperation = operationSetupForwardArgumentsFrame; |
| else |
| setupOperation = operationSetupVarargsFrame; |
| callOperation(setupOperation, m_profiledCodeBlock->globalObject(), regT1, JSValueRegs(regT2, regT4), firstVarArgOffset, regT0); |
| move(returnValueGPR, regT1); |
| |
| // Profile the argument count. |
| load32(Address(regT1, CallFrameSlot::argumentCountIncludingThis * static_cast<int>(sizeof(Register)) + PayloadOffset), regT2); |
| load32(info->addressOfMaxArgumentCountIncludingThis(), regT0); |
| Jump notBiggest = branch32(Above, regT0, regT2); |
| store32(regT2, info->addressOfMaxArgumentCountIncludingThis()); |
| notBiggest.link(this); |
| |
| // Initialize 'this'. |
| emitLoad(thisValue, regT2, regT0); |
| store32(regT0, Address(regT1, PayloadOffset + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))))); |
| store32(regT2, Address(regT1, TagOffset + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))))); |
| |
| addPtr(TrustedImm32(sizeof(CallerFrameAndPC)), regT1, stackPointerRegister); |
| } |
| |
| template<typename Op> |
| bool JIT::compileCallEval(const Op&) |
| { |
| return false; |
| } |
| |
| template<> |
| bool JIT::compileCallEval(const OpCallEval& bytecode) |
| { |
| addPtr(TrustedImm32(-static_cast<ptrdiff_t>(sizeof(CallerFrameAndPC))), stackPointerRegister, regT1); |
| storePtr(callFrameRegister, Address(regT1, CallFrame::callerFrameOffset())); |
| |
| addPtr(TrustedImm32(stackPointerOffsetFor(m_unlinkedCodeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister); |
| |
| move(TrustedImm32(bytecode.m_ecmaMode.value()), regT2); |
| callOperation(operationCallEval, m_profiledCodeBlock->globalObject(), regT1, regT2); |
| |
| addSlowCase(branchIfEmpty(regT1)); |
| |
| emitPutCallResult(bytecode); |
| |
| return true; |
| } |
| |
| void JIT::compileCallEvalSlowCase(const Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter) |
| { |
| linkAllSlowCases(iter); |
| |
| auto bytecode = instruction->as<OpCallEval>(); |
| CallLinkInfo* info = m_profiledCodeBlock->addCallLinkInfo(CodeOrigin(m_bytecodeIndex)); |
| info->setUpCall(CallLinkInfo::Call, regT0); |
| |
| int registerOffset = -bytecode.m_argv; |
| VirtualRegister callee = bytecode.m_callee; |
| |
| addPtr(TrustedImm32(registerOffset * sizeof(Register) + sizeof(CallerFrameAndPC)), callFrameRegister, stackPointerRegister); |
| |
| emitLoad(callee, regT1, regT0); |
| emitVirtualCall(*m_vm, m_profiledCodeBlock->globalObject(), info); |
| addPtr(TrustedImm32(stackPointerOffsetFor(m_unlinkedCodeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister); |
| checkStackPointerAlignment(); |
| |
| emitPutCallResult(bytecode); |
| } |
| |
| template <typename Op> |
| void JIT::compileOpCall(const Instruction* instruction, unsigned callLinkInfoIndex) |
| { |
| OpcodeID opcodeID = Op::opcodeID; |
| auto bytecode = instruction->as<Op>(); |
| VirtualRegister callee = calleeFor(bytecode, m_bytecodeIndex.checkpoint()); |
| |
| /* Caller always: |
| - Updates callFrameRegister to callee callFrame. |
| - Initializes ArgumentCount; CallerFrame; Callee. |
| |
| For a JS call: |
| - Callee initializes ReturnPC; CodeBlock. |
| - Callee restores callFrameRegister before return. |
| |
| For a non-JS call: |
| - Caller initializes ReturnPC; CodeBlock. |
| - Caller restores callFrameRegister after return. |
| */ |
| CallLinkInfo* info = nullptr; |
| if (opcodeID != op_call_eval) |
| info = m_profiledCodeBlock->addCallLinkInfo(CodeOrigin(m_bytecodeIndex)); |
| compileSetupFrame(bytecode, info); |
| // SP holds newCallFrame + sizeof(CallerFrameAndPC), with ArgumentCount initialized. |
| |
| auto bytecodeIndex = m_profiledCodeBlock->bytecodeIndex(instruction); |
| uint32_t locationBits = CallSiteIndex(bytecodeIndex).bits(); |
| store32(TrustedImm32(locationBits), tagFor(CallFrameSlot::argumentCountIncludingThis)); |
| emitLoad(callee, regT1, regT0); // regT1, regT0 holds callee. |
| |
| store32(regT0, Address(stackPointerRegister, CallFrameSlot::callee * static_cast<int>(sizeof(Register)) + PayloadOffset - sizeof(CallerFrameAndPC))); |
| store32(regT1, Address(stackPointerRegister, CallFrameSlot::callee * static_cast<int>(sizeof(Register)) + TagOffset - sizeof(CallerFrameAndPC))); |
| |
| if (compileCallEval(bytecode)) |
| return; |
| |
| info->setUpCall(CallLinkInfo::callTypeFor(opcodeID), regT0); |
| ASSERT(m_callCompilationInfo.size() == callLinkInfoIndex); |
| m_callCompilationInfo.append(CallCompilationInfo()); |
| m_callCompilationInfo[callLinkInfoIndex].callLinkInfo = info; |
| |
| addSlowCase(branchIfNotCell(regT1)); |
| |
| checkStackPointerAlignment(); |
| if (opcodeID == op_tail_call || opcodeID == op_tail_call_varargs || opcodeID == op_tail_call_forward_arguments) { |
| auto slowPaths = info->emitTailCallFastPath(*this, regT0, [&] { |
| emitRestoreCalleeSaves(); |
| prepareForTailCallSlow(regT2); |
| }); |
| addSlowCase(slowPaths); |
| auto doneLocation = label(); |
| m_callCompilationInfo[callLinkInfoIndex].doneLocation = doneLocation; |
| return; |
| } |
| |
| auto slowPaths = info->emitFastPath(*this, regT0, regT2, CallLinkInfo::UseDataIC::No); |
| addSlowCase(slowPaths); |
| m_callCompilationInfo[callLinkInfoIndex].doneLocation = label(); |
| |
| addPtr(TrustedImm32(stackPointerOffsetFor(m_unlinkedCodeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister); |
| checkStackPointerAlignment(); |
| |
| emitPutCallResult(bytecode); |
| } |
| |
| template <typename Op> |
| void JIT::compileOpCallSlowCase(const Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter, unsigned callLinkInfoIndex) |
| { |
| OpcodeID opcodeID = Op::opcodeID; |
| |
| if (opcodeID == op_call_eval) { |
| compileCallEvalSlowCase(instruction, iter); |
| return; |
| } |
| |
| linkAllSlowCases(iter); |
| |
| m_callCompilationInfo[callLinkInfoIndex].slowPathStart = label(); |
| |
| if (opcodeID == op_tail_call || opcodeID == op_tail_call_varargs || opcodeID == op_tail_call_forward_arguments) |
| emitRestoreCalleeSaves(); |
| |
| move(TrustedImmPtr(m_profiledCodeBlock->globalObject()), regT3); |
| m_callCompilationInfo[callLinkInfoIndex].callLinkInfo->emitSlowPath(*m_vm, *this); |
| |
| if (opcodeID == op_tail_call || opcodeID == op_tail_call_varargs || opcodeID == op_tail_call_forward_arguments) { |
| abortWithReason(JITDidReturnFromTailCall); |
| return; |
| } |
| |
| addPtr(TrustedImm32(stackPointerOffsetFor(m_unlinkedCodeBlock) * sizeof(Register)), callFrameRegister, stackPointerRegister); |
| checkStackPointerAlignment(); |
| |
| auto bytecode = instruction->as<Op>(); |
| emitPutCallResult(bytecode); |
| } |
| |
| void JIT::emit_op_iterator_open(const Instruction* instruction) |
| { |
| auto bytecode = instruction->as<OpIteratorOpen>(); |
| auto* tryFastFunction = ([&] () { |
| switch (instruction->width()) { |
| case Narrow: return iterator_open_try_fast_narrow; |
| case Wide16: return iterator_open_try_fast_wide16; |
| case Wide32: return iterator_open_try_fast_wide32; |
| default: RELEASE_ASSERT_NOT_REACHED(); |
| } |
| })(); |
| |
| JITSlowPathCall slowPathCall(this, instruction, tryFastFunction); |
| slowPathCall.call(); |
| Jump fastCase = branch32(NotEqual, GPRInfo::returnValueGPR2, TrustedImm32(static_cast<uint32_t>(IterationMode::Generic))); |
| |
| compileOpCall<OpIteratorOpen>(instruction, m_callLinkInfoIndex++); |
| |
| advanceToNextCheckpoint(); |
| |
| // call result (iterator) is in regT1 (tag)/regT0 (payload) |
| const Identifier* ident = &vm().propertyNames->next; |
| |
| emitJumpSlowCaseIfNotJSCell(regT1); |
| |
| GPRReg tagIteratorGPR = regT1; |
| GPRReg payloadIteratorGPR = regT0; |
| |
| GPRReg tagNextGPR = tagIteratorGPR; |
| GPRReg payloadNextGPR = payloadIteratorGPR; |
| |
| JSValueRegs nextRegs = JSValueRegs(tagNextGPR, payloadNextGPR); |
| |
| JITGetByIdGenerator gen( |
| m_profiledCodeBlock, |
| JITType::BaselineJIT, |
| CodeOrigin(m_bytecodeIndex), |
| CallSiteIndex(BytecodeIndex(m_bytecodeIndex.offset())), |
| RegisterSet::stubUnavailableRegisters(), |
| CacheableIdentifier::createFromImmortalIdentifier(ident->impl()), |
| JSValueRegs(tagIteratorGPR, payloadIteratorGPR), |
| nextRegs, |
| InvalidGPRReg, |
| AccessType::GetById); |
| |
| gen.generateFastPath(*this); |
| addSlowCase(gen.slowPathJump()); |
| m_getByIds.append(gen); |
| |
| emitValueProfilingSite(bytecode, nextRegs); |
| emitPutVirtualRegister(bytecode.m_next, nextRegs); |
| |
| fastCase.link(this); |
| } |
| |
| void JIT::emitSlow_op_iterator_open(const Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter) |
| { |
| linkAllSlowCases(iter); |
| compileOpCallSlowCase<OpIteratorOpen>(instruction, iter, m_callLinkInfoIndex++); |
| emitJumpSlowToHotForCheckpoint(jump()); |
| |
| linkAllSlowCases(iter); |
| |
| GPRReg tagIteratorGPR = regT1; |
| GPRReg payloadIteratorGPR = regT0; |
| |
| JumpList notObject; |
| notObject.append(branchIfNotCell(tagIteratorGPR)); |
| notObject.append(branchIfNotObject(payloadIteratorGPR)); |
| |
| auto bytecode = instruction->as<OpIteratorOpen>(); |
| VirtualRegister nextVReg = bytecode.m_next; |
| UniquedStringImpl* ident = vm().propertyNames->next.impl(); |
| |
| JITGetByIdGenerator& gen = m_getByIds[m_getByIdIndex++]; |
| |
| Label coldPathBegin = label(); |
| |
| Call call = callOperationWithProfile( |
| bytecode, |
| operationGetByIdOptimize, // operation |
| nextVReg, // result |
| TrustedImmPtr(m_profiledCodeBlock->globalObject()), // arg1 |
| gen.stubInfo(), // arg2 |
| JSValueRegs(tagIteratorGPR, payloadIteratorGPR), // arg3 |
| CacheableIdentifier::createFromImmortalIdentifier(ident).rawBits()); // arg4 |
| |
| gen.reportSlowPathCall(coldPathBegin, call); |
| auto done = jump(); |
| |
| notObject.link(this); |
| callOperation(operationThrowIteratorResultIsNotObject, TrustedImmPtr(m_profiledCodeBlock->globalObject())); |
| |
| done.link(this); |
| } |
| |
| void JIT::emit_op_iterator_next(const Instruction* instruction) |
| { |
| auto bytecode = instruction->as<OpIteratorNext>(); |
| auto* tryFastFunction = ([&] () { |
| switch (instruction->width()) { |
| case Narrow: return iterator_next_try_fast_narrow; |
| case Wide16: return iterator_next_try_fast_wide16; |
| case Wide32: return iterator_next_try_fast_wide32; |
| default: RELEASE_ASSERT_NOT_REACHED(); |
| } |
| })(); |
| |
| JSValueRegs nextRegs(regT1, regT0); |
| emitGetVirtualRegister(bytecode.m_next, nextRegs); |
| Jump genericCase = branchIfNotEmpty(nextRegs); |
| |
| JITSlowPathCall slowPathCall(this, instruction, tryFastFunction); |
| slowPathCall.call(); |
| Jump fastCase = branch32(NotEqual, GPRInfo::returnValueGPR2, TrustedImm32(static_cast<uint32_t>(IterationMode::Generic))); |
| |
| genericCase.link(this); |
| load8FromMetadata(bytecode, OpIteratorNext::Metadata::offsetOfIterationMetadata() + IterationModeMetadata::offsetOfSeenModes(), regT0); |
| or32(TrustedImm32(static_cast<uint8_t>(IterationMode::Generic)), regT0); |
| store8ToMetadata(regT0, bytecode, OpIteratorNext::Metadata::offsetOfIterationMetadata() + IterationModeMetadata::offsetOfSeenModes()); |
| compileOpCall<OpIteratorNext>(instruction, m_callLinkInfoIndex++); |
| advanceToNextCheckpoint(); |
| // call result ({ done, value } JSObject) in regT1, regT0 |
| |
| GPRReg tagValueGPR = regT1; |
| GPRReg payloadValueGPR = regT0; |
| |
| GPRReg tagDoneGPR = regT5; |
| GPRReg payloadDoneGPR = regT4; |
| |
| { |
| JSValueRegs doneRegs = JSValueRegs(tagDoneGPR, payloadDoneGPR); |
| |
| GPRReg tagIterResultGPR = regT3; |
| GPRReg payloadIterResultGPR = regT2; |
| |
| // iterResultGPR will get trashed by the first get by id below. |
| move(regT1, tagIterResultGPR); |
| move(regT0, payloadIterResultGPR); |
| |
| emitJumpSlowCaseIfNotJSCell(tagIterResultGPR); |
| |
| RegisterSet preservedRegs = RegisterSet::stubUnavailableRegisters(); |
| preservedRegs.add(tagValueGPR); |
| preservedRegs.add(payloadValueGPR); |
| JITGetByIdGenerator gen( |
| m_profiledCodeBlock, |
| JITType::BaselineJIT, |
| CodeOrigin(m_bytecodeIndex), |
| CallSiteIndex(BytecodeIndex(m_bytecodeIndex.offset())), |
| preservedRegs, |
| CacheableIdentifier::createFromImmortalIdentifier(vm().propertyNames->done.impl()), |
| JSValueRegs(tagIterResultGPR, payloadIterResultGPR), |
| doneRegs, |
| InvalidGPRReg, |
| AccessType::GetById); |
| gen.generateFastPath(*this); |
| addSlowCase(gen.slowPathJump()); |
| m_getByIds.append(gen); |
| |
| emitValueProfilingSite(bytecode, doneRegs); |
| emitPutVirtualRegister(bytecode.m_done, doneRegs); |
| advanceToNextCheckpoint(); |
| } |
| |
| { |
| JSValueRegs resultRegs = JSValueRegs(tagValueGPR, payloadValueGPR); |
| GPRReg tagIterResultGPR = regT1; |
| GPRReg payloadIterResultGPR = regT0; |
| |
| GPRReg scratch1 = regT6; |
| GPRReg scratch2 = regT7; |
| const bool shouldCheckMasqueradesAsUndefined = false; |
| JumpList iterationDone = branchIfTruthy(vm(), JSValueRegs(tagDoneGPR, payloadDoneGPR), scratch1, scratch2, fpRegT0, fpRegT1, shouldCheckMasqueradesAsUndefined, m_profiledCodeBlock->globalObject()); |
| |
| JITGetByIdGenerator gen( |
| m_profiledCodeBlock, |
| JITType::BaselineJIT, |
| CodeOrigin(m_bytecodeIndex), |
| CallSiteIndex(BytecodeIndex(m_bytecodeIndex.offset())), |
| RegisterSet::stubUnavailableRegisters(), |
| CacheableIdentifier::createFromImmortalIdentifier(vm().propertyNames->value.impl()), |
| JSValueRegs(tagIterResultGPR, payloadIterResultGPR), |
| resultRegs, |
| InvalidGPRReg, |
| AccessType::GetById); |
| gen.generateFastPath(*this); |
| addSlowCase(gen.slowPathJump()); |
| m_getByIds.append(gen); |
| |
| emitValueProfilingSite(bytecode, resultRegs); |
| emitPutVirtualRegister(bytecode.m_value, resultRegs); |
| |
| iterationDone.link(this); |
| } |
| |
| fastCase.link(this); |
| } |
| |
| void JIT::emitSlow_op_iterator_next(const Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter) |
| { |
| linkAllSlowCases(iter); |
| compileOpCallSlowCase<OpIteratorNext>(instruction, iter, m_callLinkInfoIndex++); |
| emitJumpSlowToHotForCheckpoint(jump()); |
| |
| auto bytecode = instruction->as<OpIteratorNext>(); |
| { |
| VirtualRegister doneVReg = bytecode.m_done; |
| GPRReg tagValueGPR = regT1; |
| GPRReg payloadValueGPR = regT0; |
| |
| GPRReg tagIterResultGPR = regT3; |
| GPRReg payloadIterResultGPR = regT2; |
| |
| GPRReg tagDoneGPR = regT5; |
| GPRReg payloadDoneGPR = regT4; |
| |
| linkAllSlowCases(iter); |
| JumpList notObject; |
| notObject.append(branchIfNotCell(tagIterResultGPR)); |
| notObject.append(branchIfNotObject(payloadIterResultGPR)); |
| |
| UniquedStringImpl* ident = vm().propertyNames->done.impl(); |
| JITGetByIdGenerator& gen = m_getByIds[m_getByIdIndex++]; |
| |
| Label coldPathBegin = label(); |
| |
| Call call = callOperationWithProfile( |
| bytecode, |
| operationGetByIdOptimize, // operation |
| doneVReg, // result |
| TrustedImmPtr(m_profiledCodeBlock->globalObject()), // arg1 |
| gen.stubInfo(), // arg2 |
| JSValueRegs(tagIterResultGPR, payloadIterResultGPR), // arg3 |
| CacheableIdentifier::createFromImmortalIdentifier(ident).rawBits()); // arg4 |
| |
| gen.reportSlowPathCall(coldPathBegin, call); |
| emitGetVirtualRegister(doneVReg, JSValueRegs(tagDoneGPR, payloadDoneGPR)); |
| emitGetVirtualRegister(bytecode.m_value, JSValueRegs(tagValueGPR, payloadValueGPR)); |
| emitJumpSlowToHotForCheckpoint(jump()); |
| |
| notObject.link(this); |
| callOperation(operationThrowIteratorResultIsNotObject, TrustedImmPtr(m_profiledCodeBlock->globalObject())); |
| } |
| |
| { |
| GPRReg tagIterResultGPR = regT1; |
| GPRReg payloadIterResultGPR = regT0; |
| |
| linkAllSlowCases(iter); |
| VirtualRegister valueVReg = bytecode.m_value; |
| |
| UniquedStringImpl* ident = vm().propertyNames->value.impl(); |
| JITGetByIdGenerator& gen = m_getByIds[m_getByIdIndex++]; |
| |
| Label coldPathBegin = label(); |
| |
| Call call = callOperationWithProfile( |
| bytecode, |
| operationGetByIdOptimize, // operation |
| valueVReg, // result |
| TrustedImmPtr(m_profiledCodeBlock->globalObject()), // arg1 |
| gen.stubInfo(), // arg2 |
| JSValueRegs(tagIterResultGPR, payloadIterResultGPR), // arg3 |
| CacheableIdentifier::createFromImmortalIdentifier(ident).rawBits()); // arg4 |
| |
| gen.reportSlowPathCall(coldPathBegin, call); |
| } |
| } |
| |
| } // namespace JSC |
| |
| #endif // USE(JSVALUE32_64) |
| #endif // ENABLE(JIT) |