bool JITFinalizer::finalizeFunction()
{
RELEASE_ASSERT(!m_withArityCheck.isEmptyValue());
m_jitCode->initializeCodeRef(
FINALIZE_DFG_CODE(*m_linkBuffer, ("DFG JIT code for %s", toCString(CodeBlockWithJITType(m_plan.codeBlock.get(), JITCode::DFGJIT)).data())),
m_withArityCheck);
m_plan.codeBlock->setJITCode(m_jitCode);
finalizeCommon();
return true;
}
bool JITFinalizer::finalize()
{
m_jitCode->initializeCodeRef(
FINALIZE_DFG_CODE(*m_linkBuffer, ("DFG JIT code for %s", toCString(CodeBlockWithJITType(m_plan.codeBlock.get(), JITCode::DFGJIT)).data())),
MacroAssemblerCodePtr());
m_plan.codeBlock->setJITCode(m_jitCode);
finalizeCommon();
return true;
}
MacroAssemblerCodeRef generateRegisterPreservationWrapper(VM& vm, ExecutableBase* executable, MacroAssemblerCodePtr target)
{
#if ENABLE(FTL_JIT)
// We shouldn't ever be generating wrappers for native functions.
RegisterSet toSave = registersToPreserve();
ptrdiff_t offset = registerPreservationOffset();
AssemblyHelpers jit(&vm, 0);
jit.preserveReturnAddressAfterCall(GPRInfo::regT1);
jit.load32(
AssemblyHelpers::Address(
AssemblyHelpers::stackPointerRegister,
(JSStack::ArgumentCount - JSStack::CallerFrameAndPCSize) * sizeof(Register) + PayloadOffset),
GPRInfo::regT2);
// Place the stack pointer where we want it to be.
jit.subPtr(AssemblyHelpers::TrustedImm32(offset), AssemblyHelpers::stackPointerRegister);
// Compute the number of things we will be copying.
jit.add32(
AssemblyHelpers::TrustedImm32(
JSStack::CallFrameHeaderSize - JSStack::CallerFrameAndPCSize),
GPRInfo::regT2);
ASSERT(!toSave.get(GPRInfo::regT4));
jit.move(AssemblyHelpers::stackPointerRegister, GPRInfo::regT4);
AssemblyHelpers::Label loop = jit.label();
jit.sub32(AssemblyHelpers::TrustedImm32(1), GPRInfo::regT2);
jit.load64(AssemblyHelpers::Address(GPRInfo::regT4, offset), GPRInfo::regT0);
jit.store64(GPRInfo::regT0, GPRInfo::regT4);
jit.addPtr(AssemblyHelpers::TrustedImm32(sizeof(Register)), GPRInfo::regT4);
jit.branchTest32(AssemblyHelpers::NonZero, GPRInfo::regT2).linkTo(loop, &jit);
// At this point regT4 + offset points to where we save things.
ptrdiff_t currentOffset = 0;
jit.storePtr(GPRInfo::regT1, AssemblyHelpers::Address(GPRInfo::regT4, currentOffset));
for (GPRReg gpr = AssemblyHelpers::firstRegister(); gpr <= AssemblyHelpers::lastRegister(); gpr = static_cast<GPRReg>(gpr + 1)) {
if (!toSave.get(gpr))
continue;
currentOffset += sizeof(Register);
jit.store64(gpr, AssemblyHelpers::Address(GPRInfo::regT4, currentOffset));
}
// Assume that there aren't any saved FP registers.
// Restore the tag registers.
jit.move(AssemblyHelpers::TrustedImm64(TagTypeNumber), GPRInfo::tagTypeNumberRegister);
jit.add64(AssemblyHelpers::TrustedImm32(TagMask - TagTypeNumber), GPRInfo::tagTypeNumberRegister, GPRInfo::tagMaskRegister);
jit.move(
AssemblyHelpers::TrustedImmPtr(
vm.getCTIStub(registerRestorationThunkGenerator).code().executableAddress()),
GPRInfo::nonArgGPR0);
jit.restoreReturnAddressBeforeReturn(GPRInfo::nonArgGPR0);
AssemblyHelpers::Jump jump = jit.jump();
LinkBuffer linkBuffer(vm, &jit, GLOBAL_THUNK_ID);
linkBuffer.link(jump, CodeLocationLabel(target));
if (Options::verboseFTLToJSThunk())
dataLog("Need a thunk for calls from FTL to non-FTL version of ", *executable, "\n");
return FINALIZE_DFG_CODE(linkBuffer, ("Register preservation wrapper for %s/%s, %p", toCString(executable->hashFor(CodeForCall)).data(), toCString(executable->hashFor(CodeForConstruct)).data(), target.executableAddress()));
#else // ENABLE(FTL_JIT)
UNUSED_PARAM(vm);
UNUSED_PARAM(executable);
UNUSED_PARAM(target);
// We don't support non-FTL builds for two reasons:
// - It just so happens that currently only the FTL bottoms out in this code.
// - The code above uses 64-bit instructions. It doesn't necessarily have to; it would be
// easy to change it so that it doesn't. But obviously making that change would be a
// prerequisite to removing this #if.
UNREACHABLE_FOR_PLATFORM();
return MacroAssemblerCodeRef();
#endif // ENABLE(FTL_JIT)
}
