| /* |
| * Copyright (C) 2013-2019 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" |
| #include "DFGOSRExitCompilerCommon.h" |
| |
| #if ENABLE(DFG_JIT) |
| |
| #include "Bytecodes.h" |
| #include "CheckpointOSRExitSideState.h" |
| #include "DFGJITCode.h" |
| #include "DFGOperations.h" |
| #include "JIT.h" |
| #include "JSCJSValueInlines.h" |
| #include "JSCInlines.h" |
| #include "LLIntData.h" |
| #include "LLIntThunks.h" |
| #include "ProbeContext.h" |
| #include "StructureStubInfo.h" |
| |
| namespace JSC { namespace DFG { |
| |
| void handleExitCounts(VM& vm, CCallHelpers& jit, const OSRExitBase& exit) |
| { |
| if (!exitKindMayJettison(exit.m_kind)) { |
| // FIXME: We may want to notice that we're frequently exiting |
| // at an op_catch that we didn't compile an entrypoint for, and |
| // then trigger a reoptimization of this CodeBlock: |
| // https://bugs.webkit.org/show_bug.cgi?id=175842 |
| return; |
| } |
| |
| jit.add32(AssemblyHelpers::TrustedImm32(1), AssemblyHelpers::AbsoluteAddress(&exit.m_count)); |
| |
| jit.move(AssemblyHelpers::TrustedImmPtr(jit.codeBlock()), GPRInfo::regT3); |
| |
| AssemblyHelpers::Jump tooFewFails; |
| |
| jit.load32(AssemblyHelpers::Address(GPRInfo::regT3, CodeBlock::offsetOfOSRExitCounter()), GPRInfo::regT2); |
| jit.add32(AssemblyHelpers::TrustedImm32(1), GPRInfo::regT2); |
| jit.store32(GPRInfo::regT2, AssemblyHelpers::Address(GPRInfo::regT3, CodeBlock::offsetOfOSRExitCounter())); |
| |
| jit.move(AssemblyHelpers::TrustedImmPtr(jit.baselineCodeBlock()), GPRInfo::regT0); |
| AssemblyHelpers::Jump reoptimizeNow = jit.branch32( |
| AssemblyHelpers::GreaterThanOrEqual, |
| AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecuteCounter()), |
| AssemblyHelpers::TrustedImm32(0)); |
| |
| // We want to figure out if there's a possibility that we're in a loop. For the outermost |
| // code block in the inline stack, we handle this appropriately by having the loop OSR trigger |
| // check the exit count of the replacement of the CodeBlock from which we are OSRing. The |
| // problem is the inlined functions, which might also have loops, but whose baseline versions |
| // don't know where to look for the exit count. Figure out if those loops are severe enough |
| // that we had tried to OSR enter. If so, then we should use the loop reoptimization trigger. |
| // Otherwise, we should use the normal reoptimization trigger. |
| |
| AssemblyHelpers::JumpList loopThreshold; |
| |
| for (InlineCallFrame* inlineCallFrame = exit.m_codeOrigin.inlineCallFrame(); inlineCallFrame; inlineCallFrame = inlineCallFrame->directCaller.inlineCallFrame()) { |
| loopThreshold.append( |
| jit.branchTest8( |
| AssemblyHelpers::NonZero, |
| AssemblyHelpers::AbsoluteAddress( |
| inlineCallFrame->baselineCodeBlock->ownerExecutable()->addressOfDidTryToEnterInLoop()))); |
| } |
| |
| jit.move( |
| AssemblyHelpers::TrustedImm32(jit.codeBlock()->exitCountThresholdForReoptimization()), |
| GPRInfo::regT1); |
| |
| if (!loopThreshold.empty()) { |
| AssemblyHelpers::Jump done = jit.jump(); |
| |
| loopThreshold.link(&jit); |
| jit.move( |
| AssemblyHelpers::TrustedImm32( |
| jit.codeBlock()->exitCountThresholdForReoptimizationFromLoop()), |
| GPRInfo::regT1); |
| |
| done.link(&jit); |
| } |
| |
| tooFewFails = jit.branch32(AssemblyHelpers::BelowOrEqual, GPRInfo::regT2, GPRInfo::regT1); |
| |
| reoptimizeNow.link(&jit); |
| |
| jit.setupArguments<decltype(operationTriggerReoptimizationNow)>(GPRInfo::regT0, GPRInfo::regT3, AssemblyHelpers::TrustedImmPtr(&exit)); |
| jit.prepareCallOperation(vm); |
| jit.move(AssemblyHelpers::TrustedImmPtr(tagCFunctionPtr<OperationPtrTag>(operationTriggerReoptimizationNow)), GPRInfo::nonArgGPR0); |
| jit.call(GPRInfo::nonArgGPR0, OperationPtrTag); |
| AssemblyHelpers::Jump doneAdjusting = jit.jump(); |
| |
| tooFewFails.link(&jit); |
| |
| // Adjust the execution counter such that the target is to only optimize after a while. |
| int32_t activeThreshold = |
| jit.baselineCodeBlock()->adjustedCounterValue( |
| Options::thresholdForOptimizeAfterLongWarmUp()); |
| int32_t targetValue = applyMemoryUsageHeuristicsAndConvertToInt( |
| activeThreshold, jit.baselineCodeBlock()); |
| int32_t clippedValue; |
| switch (jit.codeBlock()->jitType()) { |
| case JITType::DFGJIT: |
| clippedValue = BaselineExecutionCounter::clippedThreshold(jit.codeBlock()->globalObject(), targetValue); |
| break; |
| case JITType::FTLJIT: |
| clippedValue = UpperTierExecutionCounter::clippedThreshold(jit.codeBlock()->globalObject(), targetValue); |
| break; |
| default: |
| RELEASE_ASSERT_NOT_REACHED(); |
| #if COMPILER_QUIRK(CONSIDERS_UNREACHABLE_CODE) |
| clippedValue = 0; // Make some compilers, and mhahnenberg, happy. |
| #endif |
| break; |
| } |
| jit.store32(AssemblyHelpers::TrustedImm32(-clippedValue), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecuteCounter())); |
| jit.store32(AssemblyHelpers::TrustedImm32(activeThreshold), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionActiveThreshold())); |
| jit.store32(AssemblyHelpers::TrustedImm32(formattedTotalExecutionCount(clippedValue)), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionTotalCount())); |
| |
| doneAdjusting.link(&jit); |
| } |
| |
| MacroAssemblerCodePtr<JSEntryPtrTag> callerReturnPC(CodeBlock* baselineCodeBlockForCaller, BytecodeIndex callBytecodeIndex, InlineCallFrame::Kind trueCallerCallKind, bool& callerIsLLInt) |
| { |
| callerIsLLInt = Options::forceOSRExitToLLInt() || baselineCodeBlockForCaller->jitType() == JITType::InterpreterThunk; |
| |
| if (callBytecodeIndex.checkpoint()) { |
| if (!callerIsLLInt) |
| baselineCodeBlockForCaller->m_hasLinkedOSRExit = true; |
| return LLInt::getCodePtr<JSEntryPtrTag>(checkpoint_osr_exit_from_inlined_call_trampoline); |
| } |
| |
| MacroAssemblerCodePtr<JSEntryPtrTag> jumpTarget; |
| |
| if (callerIsLLInt) { |
| const Instruction& callInstruction = *baselineCodeBlockForCaller->instructions().at(callBytecodeIndex).ptr(); |
| #define LLINT_RETURN_LOCATION(name) (callInstruction.isWide16() ? LLInt::getWide16CodePtr<JSEntryPtrTag>(name##_return_location) : (callInstruction.isWide32() ? LLInt::getWide32CodePtr<JSEntryPtrTag>(name##_return_location) : LLInt::getCodePtr<JSEntryPtrTag>(name##_return_location))) |
| |
| switch (trueCallerCallKind) { |
| case InlineCallFrame::Call: |
| jumpTarget = LLINT_RETURN_LOCATION(op_call); |
| break; |
| case InlineCallFrame::Construct: |
| jumpTarget = LLINT_RETURN_LOCATION(op_construct); |
| break; |
| case InlineCallFrame::CallVarargs: |
| jumpTarget = LLINT_RETURN_LOCATION(op_call_varargs_slow); |
| break; |
| case InlineCallFrame::ConstructVarargs: |
| jumpTarget = LLINT_RETURN_LOCATION(op_construct_varargs_slow); |
| break; |
| case InlineCallFrame::GetterCall: { |
| if (callInstruction.opcodeID() == op_get_by_id) |
| jumpTarget = LLINT_RETURN_LOCATION(op_get_by_id); |
| else if (callInstruction.opcodeID() == op_get_by_val) |
| jumpTarget = LLINT_RETURN_LOCATION(op_get_by_val); |
| else |
| RELEASE_ASSERT_NOT_REACHED(); |
| break; |
| } |
| case InlineCallFrame::SetterCall: { |
| if (callInstruction.opcodeID() == op_put_by_id) |
| jumpTarget = LLINT_RETURN_LOCATION(op_put_by_id); |
| else if (callInstruction.opcodeID() == op_put_by_val) |
| jumpTarget = LLINT_RETURN_LOCATION(op_put_by_val); |
| else |
| RELEASE_ASSERT_NOT_REACHED(); |
| break; |
| } |
| default: |
| RELEASE_ASSERT_NOT_REACHED(); |
| } |
| |
| #undef LLINT_RETURN_LOCATION |
| |
| } else { |
| baselineCodeBlockForCaller->m_hasLinkedOSRExit = true; |
| |
| switch (trueCallerCallKind) { |
| case InlineCallFrame::Call: |
| case InlineCallFrame::Construct: |
| case InlineCallFrame::CallVarargs: |
| case InlineCallFrame::ConstructVarargs: { |
| CallLinkInfo* callLinkInfo = |
| baselineCodeBlockForCaller->getCallLinkInfoForBytecodeIndex(callBytecodeIndex); |
| RELEASE_ASSERT(callLinkInfo); |
| |
| jumpTarget = callLinkInfo->callReturnLocation().retagged<JSEntryPtrTag>(); |
| break; |
| } |
| |
| case InlineCallFrame::GetterCall: |
| case InlineCallFrame::SetterCall: { |
| StructureStubInfo* stubInfo = |
| baselineCodeBlockForCaller->findStubInfo(CodeOrigin(callBytecodeIndex)); |
| RELEASE_ASSERT(stubInfo); |
| |
| jumpTarget = stubInfo->doneLocation.retagged<JSEntryPtrTag>(); |
| break; |
| } |
| |
| default: |
| RELEASE_ASSERT_NOT_REACHED(); |
| } |
| } |
| |
| return jumpTarget; |
| } |
| |
| CCallHelpers::Address calleeSaveSlot(InlineCallFrame* inlineCallFrame, CodeBlock* baselineCodeBlock, GPRReg calleeSave) |
| { |
| const RegisterAtOffsetList* calleeSaves = baselineCodeBlock->calleeSaveRegisters(); |
| for (unsigned i = 0; i < calleeSaves->size(); i++) { |
| RegisterAtOffset entry = calleeSaves->at(i); |
| if (entry.reg() != calleeSave) |
| continue; |
| return CCallHelpers::Address(CCallHelpers::framePointerRegister, static_cast<VirtualRegister>(inlineCallFrame->stackOffset).offsetInBytes() + entry.offset()); |
| } |
| |
| RELEASE_ASSERT_NOT_REACHED(); |
| return CCallHelpers::Address(CCallHelpers::framePointerRegister); |
| } |
| |
| void reifyInlinedCallFrames(CCallHelpers& jit, const OSRExitBase& exit) |
| { |
| // FIXME: We shouldn't leave holes on the stack when performing an OSR exit |
| // in presence of inlined tail calls. |
| // https://bugs.webkit.org/show_bug.cgi?id=147511 |
| ASSERT(JITCode::isBaselineCode(jit.baselineCodeBlock()->jitType())); |
| jit.storePtr(AssemblyHelpers::TrustedImmPtr(jit.baselineCodeBlock()), AssemblyHelpers::addressFor(CallFrameSlot::codeBlock)); |
| |
| const CodeOrigin* codeOrigin; |
| for (codeOrigin = &exit.m_codeOrigin; codeOrigin && codeOrigin->inlineCallFrame(); codeOrigin = codeOrigin->inlineCallFrame()->getCallerSkippingTailCalls()) { |
| InlineCallFrame* inlineCallFrame = codeOrigin->inlineCallFrame(); |
| CodeBlock* baselineCodeBlock = jit.baselineCodeBlockFor(*codeOrigin); |
| InlineCallFrame::Kind trueCallerCallKind; |
| CodeOrigin* trueCaller = inlineCallFrame->getCallerSkippingTailCalls(&trueCallerCallKind); |
| GPRReg callerFrameGPR = GPRInfo::callFrameRegister; |
| |
| bool callerIsLLInt = false; |
| |
| if (!trueCaller) { |
| ASSERT(inlineCallFrame->isTail()); |
| jit.loadPtr(AssemblyHelpers::Address(GPRInfo::callFrameRegister, CallFrame::returnPCOffset()), GPRInfo::regT3); |
| #if CPU(ARM64E) |
| jit.addPtr(AssemblyHelpers::TrustedImm32(sizeof(CallerFrameAndPC)), GPRInfo::callFrameRegister, GPRInfo::regT2); |
| jit.untagPtr(GPRInfo::regT2, GPRInfo::regT3); |
| jit.addPtr(AssemblyHelpers::TrustedImm32(inlineCallFrame->returnPCOffset() + sizeof(void*)), GPRInfo::callFrameRegister, GPRInfo::regT2); |
| jit.tagPtr(GPRInfo::regT2, GPRInfo::regT3); |
| #endif |
| jit.storePtr(GPRInfo::regT3, AssemblyHelpers::addressForByteOffset(inlineCallFrame->returnPCOffset())); |
| jit.loadPtr(AssemblyHelpers::Address(GPRInfo::callFrameRegister, CallFrame::callerFrameOffset()), GPRInfo::regT3); |
| callerFrameGPR = GPRInfo::regT3; |
| } else { |
| CodeBlock* baselineCodeBlockForCaller = jit.baselineCodeBlockFor(*trueCaller); |
| auto callBytecodeIndex = trueCaller->bytecodeIndex(); |
| MacroAssemblerCodePtr<JSEntryPtrTag> jumpTarget = callerReturnPC(baselineCodeBlockForCaller, callBytecodeIndex, trueCallerCallKind, callerIsLLInt); |
| |
| if (trueCaller->inlineCallFrame()) { |
| jit.addPtr( |
| AssemblyHelpers::TrustedImm32(trueCaller->inlineCallFrame()->stackOffset * sizeof(EncodedJSValue)), |
| GPRInfo::callFrameRegister, |
| GPRInfo::regT3); |
| callerFrameGPR = GPRInfo::regT3; |
| } |
| |
| #if CPU(ARM64E) |
| jit.addPtr(AssemblyHelpers::TrustedImm32(inlineCallFrame->returnPCOffset() + sizeof(void*)), GPRInfo::callFrameRegister, GPRInfo::regT2); |
| jit.move(AssemblyHelpers::TrustedImmPtr(jumpTarget.untaggedExecutableAddress()), GPRInfo::nonArgGPR0); |
| jit.tagPtr(GPRInfo::regT2, GPRInfo::nonArgGPR0); |
| jit.storePtr(GPRInfo::nonArgGPR0, AssemblyHelpers::addressForByteOffset(inlineCallFrame->returnPCOffset())); |
| #else |
| jit.storePtr(AssemblyHelpers::TrustedImmPtr(jumpTarget.untaggedExecutableAddress()), AssemblyHelpers::addressForByteOffset(inlineCallFrame->returnPCOffset())); |
| #endif |
| } |
| |
| jit.storePtr(AssemblyHelpers::TrustedImmPtr(baselineCodeBlock), AssemblyHelpers::addressFor((VirtualRegister)(inlineCallFrame->stackOffset + CallFrameSlot::codeBlock))); |
| |
| // Restore the inline call frame's callee save registers. |
| // If this inlined frame is a tail call that will return back to the original caller, we need to |
| // copy the prior contents of the tag registers already saved for the outer frame to this frame. |
| jit.emitSaveOrCopyCalleeSavesFor( |
| baselineCodeBlock, |
| static_cast<VirtualRegister>(inlineCallFrame->stackOffset), |
| trueCaller ? AssemblyHelpers::UseExistingTagRegisterContents : AssemblyHelpers::CopyBaselineCalleeSavedRegistersFromBaseFrame, |
| GPRInfo::regT2); |
| |
| if (callerIsLLInt) { |
| CodeBlock* baselineCodeBlockForCaller = jit.baselineCodeBlockFor(*trueCaller); |
| jit.storePtr(CCallHelpers::TrustedImmPtr(baselineCodeBlockForCaller->metadataTable()), calleeSaveSlot(inlineCallFrame, baselineCodeBlock, LLInt::Registers::metadataTableGPR)); |
| jit.storePtr(CCallHelpers::TrustedImmPtr(baselineCodeBlockForCaller->instructionsRawPointer()), calleeSaveSlot(inlineCallFrame, baselineCodeBlock, LLInt::Registers::pbGPR)); |
| } |
| |
| if (!inlineCallFrame->isVarargs()) |
| jit.store32(AssemblyHelpers::TrustedImm32(inlineCallFrame->argumentCountIncludingThis), AssemblyHelpers::payloadFor(VirtualRegister(inlineCallFrame->stackOffset + CallFrameSlot::argumentCountIncludingThis))); |
| jit.storePtr(callerFrameGPR, AssemblyHelpers::addressForByteOffset(inlineCallFrame->callerFrameOffset())); |
| uint32_t locationBits = CallSiteIndex(baselineCodeBlock->bytecodeIndexForExit(codeOrigin->bytecodeIndex())).bits(); |
| jit.store32(AssemblyHelpers::TrustedImm32(locationBits), AssemblyHelpers::tagFor(VirtualRegister(inlineCallFrame->stackOffset + CallFrameSlot::argumentCountIncludingThis))); |
| #if USE(JSVALUE64) |
| if (!inlineCallFrame->isClosureCall) |
| jit.store64(AssemblyHelpers::TrustedImm64(JSValue::encode(JSValue(inlineCallFrame->calleeConstant()))), AssemblyHelpers::addressFor(VirtualRegister(inlineCallFrame->stackOffset + CallFrameSlot::callee))); |
| #else // USE(JSVALUE64) // so this is the 32-bit part |
| jit.store32(AssemblyHelpers::TrustedImm32(JSValue::CellTag), AssemblyHelpers::tagFor(VirtualRegister(inlineCallFrame->stackOffset + CallFrameSlot::callee))); |
| if (!inlineCallFrame->isClosureCall) |
| jit.storePtr(AssemblyHelpers::TrustedImmPtr(inlineCallFrame->calleeConstant()), AssemblyHelpers::payloadFor(VirtualRegister(inlineCallFrame->stackOffset + CallFrameSlot::callee))); |
| #endif // USE(JSVALUE64) // ending the #else part, so directly above is the 32-bit part |
| } |
| |
| // Don't need to set the toplevel code origin if we only did inline tail calls |
| if (codeOrigin) { |
| uint32_t locationBits = CallSiteIndex(BytecodeIndex(codeOrigin->bytecodeIndex().offset())).bits(); |
| jit.store32(AssemblyHelpers::TrustedImm32(locationBits), AssemblyHelpers::tagFor(CallFrameSlot::argumentCountIncludingThis)); |
| } |
| } |
| |
| static void osrWriteBarrier(VM& vm, CCallHelpers& jit, GPRReg owner, GPRReg scratch) |
| { |
| AssemblyHelpers::Jump ownerIsRememberedOrInEden = jit.barrierBranchWithoutFence(owner); |
| |
| jit.setupArguments<decltype(operationOSRWriteBarrier)>(&vm, owner); |
| jit.prepareCallOperation(vm); |
| jit.move(MacroAssembler::TrustedImmPtr(tagCFunctionPtr<OperationPtrTag>(operationOSRWriteBarrier)), scratch); |
| jit.call(scratch, OperationPtrTag); |
| |
| ownerIsRememberedOrInEden.link(&jit); |
| } |
| |
| void adjustAndJumpToTarget(VM& vm, CCallHelpers& jit, const OSRExitBase& exit) |
| { |
| jit.memoryFence(); |
| |
| jit.move( |
| AssemblyHelpers::TrustedImmPtr( |
| jit.codeBlock()->baselineAlternative()), GPRInfo::argumentGPR1); |
| osrWriteBarrier(vm, jit, GPRInfo::argumentGPR1, GPRInfo::nonArgGPR0); |
| |
| // We barrier all inlined frames -- and not just the current inline stack -- |
| // because we don't know which inlined function owns the value profile that |
| // we'll update when we exit. In the case of "f() { a(); b(); }", if both |
| // a and b are inlined, we might exit inside b due to a bad value loaded |
| // from a. |
| // FIXME: MethodOfGettingAValueProfile should remember which CodeBlock owns |
| // the value profile. |
| InlineCallFrameSet* inlineCallFrames = jit.codeBlock()->jitCode()->dfgCommon()->inlineCallFrames.get(); |
| if (inlineCallFrames) { |
| for (InlineCallFrame* inlineCallFrame : *inlineCallFrames) { |
| jit.move( |
| AssemblyHelpers::TrustedImmPtr( |
| inlineCallFrame->baselineCodeBlock.get()), GPRInfo::argumentGPR1); |
| osrWriteBarrier(vm, jit, GPRInfo::argumentGPR1, GPRInfo::nonArgGPR0); |
| } |
| } |
| |
| auto* exitInlineCallFrame = exit.m_codeOrigin.inlineCallFrame(); |
| if (exitInlineCallFrame) |
| jit.addPtr(AssemblyHelpers::TrustedImm32(exitInlineCallFrame->stackOffset * sizeof(EncodedJSValue)), GPRInfo::callFrameRegister); |
| |
| CodeBlock* codeBlockForExit = jit.baselineCodeBlockFor(exit.m_codeOrigin); |
| ASSERT(codeBlockForExit == codeBlockForExit->baselineVersion()); |
| ASSERT(JITCode::isBaselineCode(codeBlockForExit->jitType())); |
| |
| void* jumpTarget; |
| bool exitToLLInt = Options::forceOSRExitToLLInt() || codeBlockForExit->jitType() == JITType::InterpreterThunk; |
| if (exitToLLInt) { |
| auto bytecodeIndex = exit.m_codeOrigin.bytecodeIndex(); |
| const Instruction& currentInstruction = *codeBlockForExit->instructions().at(bytecodeIndex).ptr(); |
| MacroAssemblerCodePtr<JSEntryPtrTag> destination; |
| if (bytecodeIndex.checkpoint()) |
| destination = LLInt::getCodePtr<JSEntryPtrTag>(checkpoint_osr_exit_trampoline); |
| else |
| destination = LLInt::getCodePtr<JSEntryPtrTag>(currentInstruction); |
| |
| if (exit.isExceptionHandler()) { |
| jit.move(CCallHelpers::TrustedImmPtr(¤tInstruction), GPRInfo::regT2); |
| jit.storePtr(GPRInfo::regT2, &vm.targetInterpreterPCForThrow); |
| } |
| |
| jit.move(CCallHelpers::TrustedImmPtr(codeBlockForExit->metadataTable()), LLInt::Registers::metadataTableGPR); |
| jit.move(CCallHelpers::TrustedImmPtr(codeBlockForExit->instructionsRawPointer()), LLInt::Registers::pbGPR); |
| jit.move(CCallHelpers::TrustedImm32(bytecodeIndex.offset()), LLInt::Registers::pcGPR); |
| jumpTarget = destination.retagged<OSRExitPtrTag>().executableAddress(); |
| } else { |
| codeBlockForExit->m_hasLinkedOSRExit = true; |
| |
| BytecodeIndex exitIndex = exit.m_codeOrigin.bytecodeIndex(); |
| MacroAssemblerCodePtr<JSEntryPtrTag> destination; |
| if (exitIndex.checkpoint()) |
| destination = LLInt::getCodePtr<JSEntryPtrTag>(checkpoint_osr_exit_trampoline); |
| else { |
| ASSERT(codeBlockForExit->bytecodeIndexForExit(exitIndex) == exitIndex); |
| destination = codeBlockForExit->jitCodeMap().find(exitIndex); |
| } |
| |
| ASSERT(destination); |
| |
| jumpTarget = destination.retagged<OSRExitPtrTag>().executableAddress(); |
| } |
| |
| jit.addPtr(AssemblyHelpers::TrustedImm32(JIT::stackPointerOffsetFor(codeBlockForExit) * sizeof(Register)), GPRInfo::callFrameRegister, AssemblyHelpers::stackPointerRegister); |
| if (exit.isExceptionHandler()) { |
| // Since we're jumping to op_catch, we need to set callFrameForCatch. |
| jit.storePtr(GPRInfo::callFrameRegister, vm.addressOfCallFrameForCatch()); |
| } |
| |
| jit.move(AssemblyHelpers::TrustedImmPtr(jumpTarget), GPRInfo::regT2); |
| jit.farJump(GPRInfo::regT2, OSRExitPtrTag); |
| } |
| |
| } } // namespace JSC::DFG |
| |
| #endif // ENABLE(DFG_JIT) |
| |
