#include "config.h"
#include "DFGThunks.h"
#if ENABLE(DFG_JIT)
#include "CCallHelpers.h"
#include "DFGJITCode.h"
#include "DFGOSRExit.h"
#include "FPRInfo.h"
#include "GPRInfo.h"
#include "LinkBuffer.h"
#include "MacroAssembler.h"
#include "JSCInlines.h"
#include "DFGOSRExitCompilerCommon.h"
namespace JSC { namespace DFG {
MacroAssemblerCodeRef<JITThunkPtrTag> osrExitThunkGenerator(VM* vm)
{
MacroAssembler jit;
jit.probe(OSRExit::executeOSRExit, vm);
LinkBuffer patchBuffer(jit, GLOBAL_THUNK_ID);
return FINALIZE_CODE(patchBuffer, JITThunkPtrTag, "DFG OSR exit thunk");
}
MacroAssemblerCodeRef<JITThunkPtrTag> osrExitGenerationThunkGenerator(VM* vm)
{
MacroAssembler jit;
adjustFrameAndStackInOSRExitCompilerThunk<DFG::JITCode>(jit, vm, JITCode::DFGJIT);
size_t scratchSize = sizeof(EncodedJSValue) * (GPRInfo::numberOfRegisters + FPRInfo::numberOfRegisters);
ScratchBuffer* scratchBuffer = vm->scratchBufferForSize(scratchSize);
EncodedJSValue* buffer = static_cast<EncodedJSValue*>(scratchBuffer->dataBuffer());
for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i) {
#if USE(JSVALUE64)
jit.store64(GPRInfo::toRegister(i), buffer + i);
#else
jit.store32(GPRInfo::toRegister(i), buffer + i);
#endif
}
for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
jit.move(MacroAssembler::TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0);
jit.storeDouble(FPRInfo::toRegister(i), MacroAssembler::Address(GPRInfo::regT0));
}
jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->addressOfActiveLength()), GPRInfo::regT0);
jit.storePtr(MacroAssembler::TrustedImmPtr(scratchSize), MacroAssembler::Address(GPRInfo::regT0));
#if CPU(X86)
jit.poke(GPRInfo::callFrameRegister, 0);
#else
jit.move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR0);
#endif
MacroAssembler::Call functionCall = jit.call(OperationPtrTag);
jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->addressOfActiveLength()), GPRInfo::regT0);
jit.storePtr(MacroAssembler::TrustedImmPtr(nullptr), MacroAssembler::Address(GPRInfo::regT0));
for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
jit.move(MacroAssembler::TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0);
jit.loadDouble(MacroAssembler::Address(GPRInfo::regT0), FPRInfo::toRegister(i));
}
for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i) {
#if USE(JSVALUE64)
jit.load64(buffer + i, GPRInfo::toRegister(i));
#else
jit.load32(buffer + i, GPRInfo::toRegister(i));
#endif
}
jit.jump(MacroAssembler::AbsoluteAddress(&vm->osrExitJumpDestination), OSRExitPtrTag);
LinkBuffer patchBuffer(jit, GLOBAL_THUNK_ID);
patchBuffer.link(functionCall, FunctionPtr<OperationPtrTag>(OSRExit::compileOSRExit));
return FINALIZE_CODE(patchBuffer, JITThunkPtrTag, "DFG OSR exit generation thunk");
}
MacroAssemblerCodeRef<JITThunkPtrTag> osrEntryThunkGenerator(VM* vm)
{
AssemblyHelpers jit(nullptr);
ptrdiff_t offsetOfFrameSize = 0; ptrdiff_t offsetOfTargetPC = offsetOfFrameSize + sizeof(EncodedJSValue);
ptrdiff_t offsetOfPayload = offsetOfTargetPC + sizeof(EncodedJSValue);
ptrdiff_t offsetOfLocals = offsetOfPayload + sizeof(Register) * CallFrame::headerSizeInRegisters;
jit.move(GPRInfo::returnValueGPR2, GPRInfo::regT0);
jit.loadPtr(MacroAssembler::Address(GPRInfo::regT0, offsetOfFrameSize), GPRInfo::regT1); jit.negPtr(GPRInfo::regT1, GPRInfo::regT2);
jit.getEffectiveAddress(MacroAssembler::BaseIndex(GPRInfo::callFrameRegister, GPRInfo::regT2, MacroAssembler::TimesEight), MacroAssembler::stackPointerRegister);
MacroAssembler::Label loop = jit.label();
jit.subPtr(MacroAssembler::TrustedImm32(1), GPRInfo::regT1);
jit.negPtr(GPRInfo::regT1, GPRInfo::regT4);
jit.load32(MacroAssembler::BaseIndex(GPRInfo::regT0, GPRInfo::regT1, MacroAssembler::TimesEight, offsetOfLocals), GPRInfo::regT2);
jit.load32(MacroAssembler::BaseIndex(GPRInfo::regT0, GPRInfo::regT1, MacroAssembler::TimesEight, offsetOfLocals + sizeof(int32_t)), GPRInfo::regT3);
jit.store32(GPRInfo::regT2, MacroAssembler::BaseIndex(GPRInfo::callFrameRegister, GPRInfo::regT4, MacroAssembler::TimesEight, -static_cast<intptr_t>(sizeof(Register))));
jit.store32(GPRInfo::regT3, MacroAssembler::BaseIndex(GPRInfo::callFrameRegister, GPRInfo::regT4, MacroAssembler::TimesEight, -static_cast<intptr_t>(sizeof(Register)) + static_cast<intptr_t>(sizeof(int32_t))));
jit.branchPtr(MacroAssembler::NotEqual, GPRInfo::regT1, MacroAssembler::TrustedImmPtr(bitwise_cast<void*>(-static_cast<intptr_t>(CallFrame::headerSizeInRegisters)))).linkTo(loop, &jit);
jit.loadPtr(MacroAssembler::Address(GPRInfo::regT0, offsetOfTargetPC), GPRInfo::regT1);
MacroAssembler::Jump ok = jit.branchPtr(MacroAssembler::Above, GPRInfo::regT1, MacroAssembler::TrustedImmPtr(bitwise_cast<void*>(static_cast<intptr_t>(1000))));
jit.abortWithReason(DFGUnreasonableOSREntryJumpDestination);
ok.link(&jit);
jit.restoreCalleeSavesFromEntryFrameCalleeSavesBuffer(vm->topEntryFrame);
jit.emitMaterializeTagCheckRegisters();
jit.jump(GPRInfo::regT1, GPRInfo::callFrameRegister);
LinkBuffer patchBuffer(jit, GLOBAL_THUNK_ID);
return FINALIZE_CODE(patchBuffer, JITThunkPtrTag, "DFG OSR entry thunk");
}
} }
#endif // ENABLE(DFG_JIT)