void compileOSRExit(ExecState* exec)
{
if (exec->vm().callFrameForCatch)
RELEASE_ASSERT(exec->vm().callFrameForCatch == exec);
CodeBlock* codeBlock = exec->codeBlock();
ASSERT(codeBlock);
ASSERT(codeBlock->jitType() == JITCode::DFGJIT);
VM* vm = &exec->vm();
// It's sort of preferable that we don't GC while in here. Anyways, doing so wouldn't
// really be profitable.
DeferGCForAWhile deferGC(vm->heap);
uint32_t exitIndex = vm->osrExitIndex;
OSRExit& exit = codeBlock->jitCode()->dfg()->osrExit[exitIndex];
if (vm->callFrameForCatch)
ASSERT(exit.m_kind == GenericUnwind);
if (exit.isExceptionHandler())
ASSERT(!!vm->exception());
prepareCodeOriginForOSRExit(exec, exit.m_codeOrigin);
// Compute the value recoveries.
Operands<ValueRecovery> operands;
codeBlock->jitCode()->dfg()->variableEventStream.reconstruct(codeBlock, exit.m_codeOrigin, codeBlock->jitCode()->dfg()->minifiedDFG, exit.m_streamIndex, operands);
SpeculationRecovery* recovery = 0;
if (exit.m_recoveryIndex != UINT_MAX)
recovery = &codeBlock->jitCode()->dfg()->speculationRecovery[exit.m_recoveryIndex];
{
CCallHelpers jit(vm, codeBlock);
OSRExitCompiler exitCompiler(jit);
if (exit.m_kind == GenericUnwind) {
// We are acting as a defacto op_catch because we arrive here from genericUnwind().
// So, we must restore our call frame and stack pointer.
jit.restoreCalleeSavesFromVMEntryFrameCalleeSavesBuffer();
jit.loadPtr(vm->addressOfCallFrameForCatch(), GPRInfo::callFrameRegister);
jit.addPtr(CCallHelpers::TrustedImm32(codeBlock->stackPointerOffset() * sizeof(Register)),
GPRInfo::callFrameRegister, CCallHelpers::stackPointerRegister);
}
jit.jitAssertHasValidCallFrame();
if (vm->m_perBytecodeProfiler && codeBlock->jitCode()->dfgCommon()->compilation) {
Profiler::Database& database = *vm->m_perBytecodeProfiler;
Profiler::Compilation* compilation = codeBlock->jitCode()->dfgCommon()->compilation.get();
Profiler::OSRExit* profilerExit = compilation->addOSRExit(
exitIndex, Profiler::OriginStack(database, codeBlock, exit.m_codeOrigin),
exit.m_kind, exit.m_kind == UncountableInvalidation);
jit.add64(CCallHelpers::TrustedImm32(1), CCallHelpers::AbsoluteAddress(profilerExit->counterAddress()));
}
exitCompiler.compileExit(exit, operands, recovery);
LinkBuffer patchBuffer(*vm, jit, codeBlock);
exit.m_code = FINALIZE_CODE_IF(
shouldDumpDisassembly() || Options::verboseOSR(),
patchBuffer,
("DFG OSR exit #%u (%s, %s) from %s, with operands = %s",
exitIndex, toCString(exit.m_codeOrigin).data(),
exitKindToString(exit.m_kind), toCString(*codeBlock).data(),
toCString(ignoringContext<DumpContext>(operands)).data()));
}
MacroAssembler::repatchJump(exit.codeLocationForRepatch(codeBlock), CodeLocationLabel(exit.m_code.code()));
vm->osrExitJumpDestination = exit.m_code.code().executableAddress();
}
