void* prepareOSREntry(
ExecState* exec, CodeBlock* dfgCodeBlock, CodeBlock* entryCodeBlock,
unsigned bytecodeIndex, unsigned streamIndex)
{
VM& vm = exec->vm();
CodeBlock* baseline = dfgCodeBlock->baselineVersion();
DFG::JITCode* dfgCode = dfgCodeBlock->jitCode()->dfg();
ForOSREntryJITCode* entryCode = entryCodeBlock->jitCode()->ftlForOSREntry();
if (Options::verboseOSR()) {
dataLog(
"FTL OSR from ", *dfgCodeBlock, " to ", *entryCodeBlock, " at bc#",
bytecodeIndex, ".\n");
}
if (bytecodeIndex != entryCode->bytecodeIndex()) {
if (Options::verboseOSR())
dataLog(" OSR failed because we don't have an entrypoint for bc#", bytecodeIndex, "; ours is for bc#", entryCode->bytecodeIndex());
return 0;
}
Operands<JSValue> values;
dfgCode->reconstruct(
exec, dfgCodeBlock, CodeOrigin(bytecodeIndex), streamIndex, values);
if (Options::verboseOSR())
dataLog(" Values at entry: ", values, "\n");
for (int argument = values.numberOfArguments(); argument--;) {
RELEASE_ASSERT(
exec->r(virtualRegisterForArgument(argument).offset()).jsValue() == values.argument(argument));
}
RELEASE_ASSERT(
static_cast<int>(values.numberOfLocals()) == baseline->m_numCalleeRegisters);
EncodedJSValue* scratch = static_cast<EncodedJSValue*>(
entryCode->entryBuffer()->dataBuffer());
for (int local = values.numberOfLocals(); local--;)
scratch[local] = JSValue::encode(values.local(local));
int stackFrameSize = entryCode->common.requiredRegisterCountForExecutionAndExit();
if (!vm.interpreter->stack().grow(&exec->registers()[virtualRegisterForLocal(stackFrameSize).offset()])) {
if (Options::verboseOSR())
dataLog(" OSR failed because stack growth failed.\n");
return 0;
}
exec->setCodeBlock(entryCodeBlock);
void* result = entryCode->addressForCall().executableAddress();
if (Options::verboseOSR())
dataLog(" Entry will succeed, going to address", RawPointer(result), "\n");
return result;
}
SUPPRESS_ASAN
void* prepareOSREntry(
ExecState* exec, CodeBlock* dfgCodeBlock, CodeBlock* entryCodeBlock,
unsigned bytecodeIndex, unsigned streamIndex)
{
VM& vm = exec->vm();
CodeBlock* baseline = dfgCodeBlock->baselineVersion();
ExecutableBase* executable = dfgCodeBlock->ownerExecutable();
DFG::JITCode* dfgCode = dfgCodeBlock->jitCode()->dfg();
ForOSREntryJITCode* entryCode = entryCodeBlock->jitCode()->ftlForOSREntry();
if (Options::verboseOSR()) {
dataLog(
"FTL OSR from ", *dfgCodeBlock, " to ", *entryCodeBlock, " at bc#",
bytecodeIndex, ".\n");
}
if (bytecodeIndex)
jsCast<ScriptExecutable*>(executable)->setDidTryToEnterInLoop(true);
if (bytecodeIndex != entryCode->bytecodeIndex()) {
if (Options::verboseOSR())
dataLog(" OSR failed because we don't have an entrypoint for bc#", bytecodeIndex, "; ours is for bc#", entryCode->bytecodeIndex(), "\n");
return 0;
}
Operands<JSValue> values;
dfgCode->reconstruct(
exec, dfgCodeBlock, CodeOrigin(bytecodeIndex), streamIndex, values);
if (Options::verboseOSR())
dataLog(" Values at entry: ", values, "\n");
for (int argument = values.numberOfArguments(); argument--;) {
JSValue valueOnStack = exec->r(virtualRegisterForArgument(argument).offset()).asanUnsafeJSValue();
JSValue reconstructedValue = values.argument(argument);
if (valueOnStack == reconstructedValue || !argument)
continue;
dataLog("Mismatch between reconstructed values and the the value on the stack for argument arg", argument, " for ", *entryCodeBlock, " at bc#", bytecodeIndex, ":\n");
dataLog(" Value on stack: ", valueOnStack, "\n");
dataLog(" Reconstructed value: ", reconstructedValue, "\n");
RELEASE_ASSERT_NOT_REACHED();
}
RELEASE_ASSERT(
static_cast<int>(values.numberOfLocals()) == baseline->m_numCalleeRegisters);
EncodedJSValue* scratch = static_cast<EncodedJSValue*>(
entryCode->entryBuffer()->dataBuffer());
for (int local = values.numberOfLocals(); local--;)
scratch[local] = JSValue::encode(values.local(local));
int stackFrameSize = entryCode->common.requiredRegisterCountForExecutionAndExit();
if (!vm.interpreter->stack().ensureCapacityFor(&exec->registers()[virtualRegisterForLocal(stackFrameSize - 1).offset()])) {
if (Options::verboseOSR())
dataLog(" OSR failed because stack growth failed.\n");
return 0;
}
exec->setCodeBlock(entryCodeBlock);
void* result = entryCode->addressForCall(
vm, executable, ArityCheckNotRequired,
RegisterPreservationNotRequired).executableAddress();
if (Options::verboseOSR())
dataLog(" Entry will succeed, going to address", RawPointer(result), "\n");
return result;
}