uint32
ion::ReflowTypeInfo(uint32 bailoutResult)
{
JSContext *cx = GetIonContext()->cx;
IonActivation *activation = cx->runtime->ionActivation;
IonSpew(IonSpew_Bailouts, "reflowing type info");
if (bailoutResult == BAILOUT_RETURN_ARGUMENT_CHECK) {
IonSpew(IonSpew_Bailouts, "reflowing type info at argument-checked entry");
ReflowArgTypes(cx);
return true;
}
RootedScript script(cx, cx->fp()->script());
jsbytecode *pc = activation->bailout()->bailoutPc();
JS_ASSERT(js_CodeSpec[*pc].format & JOF_TYPESET);
IonSpew(IonSpew_Bailouts, "reflowing type info at %s:%d pcoff %d", script->filename,
script->lineno, pc - script->code);
types::AutoEnterTypeInference enter(cx);
if (bailoutResult == BAILOUT_RETURN_TYPE_BARRIER)
script->analysis()->breakTypeBarriers(cx, pc - script->code, false);
else
JS_ASSERT(bailoutResult == BAILOUT_RETURN_MONITOR);
// When a type barrier fails, the bad value is at the top of the stack.
Value &result = cx->regs().sp[-1];
types::TypeScript::Monitor(cx, script, pc, result);
return true;
}
/*
* Given a frame that is about to return, make sure its return value and
* activation objects are fixed up. Then, pop the frame and advance the
* current PC. Note that while we could enter the JIT at this point, the
* logic would still be necessary for the interpreter, so it's easier
* (and faster) to finish frames in C++ even if at a safe point here.
*/
static bool
HandleFinishedFrame(VMFrame &f, StackFrame *entryFrame)
{
JSContext *cx = f.cx;
JS_ASSERT(FrameIsFinished(cx));
/*
* This is the most difficult and complicated piece of the tracer
* integration, and historically has been very buggy. The problem is that
* although this frame has to be popped (see RemoveExcessFrames), it may
* be at a JSOP_RETURN opcode, and it might not have ever been executed.
* That is, fp->rval may not be set to the top of the stack, and if it
* has, the stack has already been decremented. Note that fp->rval is not
* the only problem: the epilogue may never have been executed.
*
* Here are the edge cases and whether the frame has been exited cleanly:
* 1. No: A trace exited directly before a RETURN op, and the
* interpreter never ran.
* 2. Yes: The interpreter exited cleanly.
* 3. No: The interpreter exited on a safe point. LEAVE_ON_SAFE_POINT
* is not used in between JSOP_RETURN and advancing the PC,
* therefore, it cannot have been run if at a safe point.
* 4. No: Somewhere in the RunTracer call tree, we removed a frame,
* and we returned to a JSOP_RETURN opcode. Note carefully
* that in this situation, FrameIsFinished() returns true!
* 5. Yes: The function exited in the method JIT, during
* FinishExcessFrames() However, in this case, we'll never enter
* HandleFinishedFrame(): we always immediately pop JIT'd frames.
*
* Since the only scenario where this fixup is NOT needed is a normal exit
* from the interpreter, we can cleanly check for this scenario by checking
* a bit it sets in the frame.
*/
bool returnOK = true;
if (!cx->fp()->finishedInInterpreter()) {
if (JSOp(*cx->regs().pc) == JSOP_RETURN)
cx->fp()->setReturnValue(f.regs.sp[-1]);
returnOK = ScriptEpilogue(cx, cx->fp(), true);
}
if (cx->fp() != entryFrame) {
InlineReturn(f);
AdvanceReturnPC(cx);
}
return returnOK;
}
/*
* Interprets until either a safe point is reached that has method JIT'd
* code, or the current frame tries to return.
*/
static inline JSBool
PartialInterpret(VMFrame &f)
{
JSContext *cx = f.cx;
StackFrame *fp = cx->fp();
#ifdef DEBUG
JSScript *script = fp->script();
JS_ASSERT(!fp->finishedInInterpreter());
JS_ASSERT(fp->hasImacropc() ||
!script->maybeNativeCodeForPC(fp->isConstructing(), cx->regs().pc));
#endif
JSBool ok = JS_TRUE;
ok = Interpret(cx, fp, JSINTERP_SAFEPOINT);
return ok;
}
uint32
ion::ThunkToInterpreter(Value *vp)
{
JSContext *cx = GetIonContext()->cx;
IonActivation *activation = cx->runtime->ionActivation;
BailoutClosure *br = activation->takeBailout();
if (!EnsureHasCallObject(cx, cx->fp()))
return Interpret_Error;
// By default we set the forbidOsr flag on the ion script, but if a GC
// happens just after we re-enter the interpreter, the ion script get
// invalidated and we do not see the forbidOsr flag. This may cause a loop
// which apear with eager compilation and gc zeal enabled. This code is a
// workaround to avoid recompiling with OSR just after a bailout followed by
// a GC. (see Bug 746691 & Bug 751383)
jsbytecode *pc = cx->regs().pc;
while (JSOp(*pc) == JSOP_GOTO)
pc += GET_JUMP_OFFSET(pc);
if (JSOp(*pc) == JSOP_LOOPENTRY)
cx->regs().pc = GetNextPc(pc);
// When JSScript::argumentsOptimizationFailed, we cannot access Ion frames
// in order to create an arguments object for them. However, there is an
// invariant that script->needsArgsObj() implies fp->hasArgsObj() (after the
// prologue), so we must create one now for each inlined frame which needs
// one.
{
br->entryfp()->clearRunningInIon();
ScriptFrameIter iter(cx);
StackFrame *fp = NULL;
Rooted<JSScript*> script(cx, NULL);
do {
fp = iter.interpFrame();
script = iter.script();
if (script->needsArgsObj()) {
// Currently IonMonkey does not compile if the script needs an
// arguments object, so the frame should not have any argument
// object yet.
JS_ASSERT(!fp->hasArgsObj());
ArgumentsObject *argsobj = ArgumentsObject::createExpected(cx, fp);
if (!argsobj)
return Interpret_Error;
InternalBindingsHandle bindings(script, &script->bindings);
const unsigned var = Bindings::argumentsVarIndex(cx, bindings);
// The arguments is a local binding and needsArgsObj does not
// check if it is clobbered. Ensure that the local binding
// restored during bailout before storing the arguments object
// to the slot.
if (fp->unaliasedLocal(var).isMagic(JS_OPTIMIZED_ARGUMENTS))
fp->unaliasedLocal(var) = ObjectValue(*argsobj);
}
++iter;
} while (fp != br->entryfp());
}
if (activation->entryfp() == br->entryfp()) {
// If the bailout entry fp is the same as the activation entryfp, then
// there are no scripted frames below us. In this case, just shortcut
// out with a special return code, and resume interpreting in the
// original Interpret activation.
vp->setMagic(JS_ION_BAILOUT);
js_delete(br);
return Interpret_Ok;
}
InterpretStatus status = Interpret(cx, br->entryfp(), JSINTERP_BAILOUT);
if (status == Interpret_OSR) {
// The interpreter currently does not ask to perform inline OSR, so
// this path is unreachable.
JS_NOT_REACHED("invalid");
IonSpew(IonSpew_Bailouts, "Performing inline OSR %s:%d",
cx->fp()->script()->filename,
PCToLineNumber(cx->fp()->script(), cx->regs().pc));
// We want to OSR again. We need to avoid the problem where frequent
// bailouts cause recursive nestings of Interpret and EnterIon. The
// interpreter therefore shortcuts out, and now we're responsible for
// completing the OSR inline.
//
// Note that we set runningInIon so that if we re-enter C++ from within
// the inlined OSR, StackIter will know to traverse these frames.
StackFrame *fp = cx->fp();
fp->setRunningInIon();
vp->setPrivate(fp);
js_delete(br);
return Interpret_OSR;
}
if (status == Interpret_Ok)
*vp = br->entryfp()->returnValue();
// The BailoutFrameGuard's destructor will ensure that the frame is
// removed.
js_delete(br);
return status;
}
uint32
ion::InvalidationBailout(InvalidationBailoutStack *sp, size_t *frameSizeOut)
{
AssertCanGC();
sp->checkInvariants();
JSContext *cx = GetIonContext()->cx;
// We don't have an exit frame.
cx->runtime->ionTop = NULL;
IonActivationIterator ionActivations(cx);
IonBailoutIterator iter(ionActivations, sp);
IonActivation *activation = ionActivations.activation();
IonSpew(IonSpew_Bailouts, "Took invalidation bailout! Snapshot offset: %d", iter.snapshotOffset());
// Note: the frame size must be computed before we return from this function.
*frameSizeOut = iter.topFrameSize();
uint32 retval = ConvertFrames(cx, activation, iter);
{
IonJSFrameLayout *frame = iter.jsFrame();
IonSpew(IonSpew_Invalidate, "converting to exit frame");
IonSpew(IonSpew_Invalidate, " orig calleeToken %p", (void *) frame->calleeToken());
IonSpew(IonSpew_Invalidate, " orig frameSize %u", unsigned(frame->prevFrameLocalSize()));
IonSpew(IonSpew_Invalidate, " orig ra %p", (void *) frame->returnAddress());
frame->replaceCalleeToken(NULL);
EnsureExitFrame(frame);
IonSpew(IonSpew_Invalidate, " new calleeToken %p", (void *) frame->calleeToken());
IonSpew(IonSpew_Invalidate, " new frameSize %u", unsigned(frame->prevFrameLocalSize()));
IonSpew(IonSpew_Invalidate, " new ra %p", (void *) frame->returnAddress());
}
iter.ionScript()->decref(cx->runtime->defaultFreeOp());
if (cx->runtime->hasIonReturnOverride())
cx->regs().sp[-1] = cx->runtime->takeIonReturnOverride();
if (retval != BAILOUT_RETURN_FATAL_ERROR) {
if (activation->entryfp()) {
if (void *annotation = activation->entryfp()->annotation()) {
// If the entry frame has an annotation, then we invalidated and have
// immediately returned into this bailout. Transfer the annotation to
// the new topmost frame.
activation->entryfp()->setAnnotation(NULL);
cx->fp()->setAnnotation(annotation);
}
}
// If invalidation was triggered inside a stub call, we may still have to
// monitor the result, since the bailout happens before the MMonitorTypes
// instruction is executed.
jsbytecode *pc = activation->bailout()->bailoutPc();
// If this is not a ResumeAfter bailout, there's nothing to monitor,
// we will redo the op in the interpreter.
bool isResumeAfter = GetNextPc(pc) == cx->regs().pc;
if ((js_CodeSpec[*pc].format & JOF_TYPESET) && isResumeAfter) {
JS_ASSERT(retval == BAILOUT_RETURN_OK);
return BAILOUT_RETURN_MONITOR;
}
return retval;
}
return BAILOUT_RETURN_FATAL_ERROR;
}
uint32
ion::ThunkToInterpreter(Value *vp)
{
JSContext *cx = GetIonContext()->cx;
IonActivation *activation = cx->runtime->ionActivation;
BailoutClosure *br = activation->takeBailout();
if (!EnsureHasCallObject(cx, cx->fp()))
return Interpret_Error;
// By default we set the forbidOsr flag on the ion script, but if a GC
// happens just after we re-enter the interpreter, the ion script get
// invalidated and we do not see the forbidOsr flag. This may cause a loop
// which apear with eager compilation and gc zeal enabled. This code is a
// workaround to avoid recompiling with OSR just after a bailout followed by
// a GC. (see Bug 746691 & Bug 751383)
jsbytecode *pc = cx->regs().pc;
while (JSOp(*pc) == JSOP_GOTO)
pc += GET_JUMP_OFFSET(pc);
if (JSOp(*pc) == JSOP_LOOPENTRY)
cx->regs().pc = GetNextPc(pc);
if (activation->entryfp() == br->entryfp()) {
// If the bailout entry fp is the same as the activation entryfp, then
// there are no scripted frames below us. In this case, just shortcut
// out with a special return code, and resume interpreting in the
// original Interpret activation.
vp->setMagic(JS_ION_BAILOUT);
js_delete(br);
return Interpret_Ok;
}
InterpretStatus status = Interpret(cx, br->entryfp(), JSINTERP_BAILOUT);
if (status == Interpret_OSR) {
// The interpreter currently does not ask to perform inline OSR, so
// this path is unreachable.
JS_NOT_REACHED("invalid");
IonSpew(IonSpew_Bailouts, "Performing inline OSR %s:%d",
cx->fp()->script()->filename,
PCToLineNumber(cx->fp()->script(), cx->regs().pc));
// We want to OSR again. We need to avoid the problem where frequent
// bailouts cause recursive nestings of Interpret and EnterIon. The
// interpreter therefore shortcuts out, and now we're responsible for
// completing the OSR inline.
//
// Note that we set runningInIon so that if we re-enter C++ from within
// the inlined OSR, StackIter will know to traverse these frames.
StackFrame *fp = cx->fp();
fp->setRunningInIon();
vp->setPrivate(fp);
js_delete(br);
return Interpret_OSR;
}
if (status == Interpret_Ok)
*vp = br->entryfp()->returnValue();
// The BailoutFrameGuard's destructor will ensure that the frame is
// removed.
js_delete(br);
return status;
}
extern "C" void *
js_InternalThrow(VMFrame &f)
{
JSContext *cx = f.cx;
ExpandInlineFrames(cx->compartment);
// The current frame may have an associated orphaned native, if the native
// or SplatApplyArgs threw an exception.
RemoveOrphanedNative(cx, f.fp());
JS_ASSERT(!f.fp()->finishedInInterpreter());
// Make sure sp is up to date.
JS_ASSERT(&cx->regs() == &f.regs);
jsbytecode *pc = NULL;
for (;;) {
if (cx->isExceptionPending()) {
// Call the throw hook if necessary
JSThrowHook handler = cx->runtime->debugHooks.throwHook;
if (handler || !cx->compartment->getDebuggees().empty()) {
Value rval;
JSTrapStatus st = Debugger::onExceptionUnwind(cx, &rval);
if (st == JSTRAP_CONTINUE && handler) {
RootedScript fscript(cx, cx->fp()->script());
st = handler(cx, fscript, cx->regs().pc, &rval,
cx->runtime->debugHooks.throwHookData);
}
switch (st) {
case JSTRAP_ERROR:
cx->clearPendingException();
break;
case JSTRAP_CONTINUE:
break;
case JSTRAP_RETURN:
cx->clearPendingException();
cx->fp()->setReturnValue(rval);
return cx->jaegerRuntime().forceReturnFromExternC();
case JSTRAP_THROW:
cx->setPendingException(rval);
break;
default:
JS_NOT_REACHED("bad onExceptionUnwind status");
}
}
}
pc = FindExceptionHandler(cx);
if (pc)
break;
// The JIT guarantees that ScriptDebugEpilogue() and ScriptEpilogue()
// have always been run upon exiting to its caller. This is important
// for consistency, where execution modes make similar guarantees about
// prologues and epilogues. Interpret(), and Invoke() all rely on this
// property.
JS_ASSERT(!f.fp()->finishedInInterpreter());
UnwindScope(cx, 0);
f.regs.setToEndOfScript();
if (cx->compartment->debugMode()) {
// This can turn a throw or error into a healthy return. Note that
// we will run ScriptDebugEpilogue again (from AnyFrameEpilogue);
// ScriptDebugEpilogue is prepared for this eventuality.
if (js::ScriptDebugEpilogue(cx, f.fp(), false))
return cx->jaegerRuntime().forceReturnFromExternC();
}
f.fp()->epilogue(f.cx);
// Don't remove the last frame, this is the responsibility of
// JaegerShot()'s caller. We only guarantee that ScriptEpilogue()
// has been run.
if (f.entryfp == f.fp())
break;
f.cx->stack.popInlineFrame(f.regs);
DebugOnly<JSOp> op = JSOp(*f.regs.pc);
JS_ASSERT(op == JSOP_CALL ||
op == JSOP_NEW ||
op == JSOP_EVAL ||
op == JSOP_FUNCALL ||
op == JSOP_FUNAPPLY);
f.regs.pc += JSOP_CALL_LENGTH;
}
JS_ASSERT(&cx->regs() == &f.regs);
if (!pc)
return NULL;
StackFrame *fp = cx->fp();
RootedScript script(cx, fp->script());
/*
* Fall back to EnterMethodJIT and finish the frame in the interpreter.
* With type inference enabled, we may wipe out all JIT code on the
* stack without patching ncode values to jump to the interpreter, and
* thus can only enter JIT code via EnterMethodJIT (which overwrites
* its entry frame's ncode). See ClearAllFrames.
*/
cx->jaegerRuntime().setLastUnfinished(Jaeger_Unfinished);
if (!JSScript::ensureRanAnalysis(cx, script)) {
js_ReportOutOfMemory(cx);
return NULL;
}
analyze::AutoEnterAnalysis enter(cx);
/*
* Interpret the ENTERBLOCK and EXCEPTION opcodes, so that we don't go
* back into the interpreter with a pending exception. This will cause
* it to immediately rethrow.
*/
if (cx->isExceptionPending()) {
JS_ASSERT(JSOp(*pc) == JSOP_ENTERBLOCK);
StaticBlockObject &blockObj = script->getObject(GET_UINT32_INDEX(pc))->asStaticBlock();
Value *vp = cx->regs().sp + blockObj.slotCount();
SetValueRangeToUndefined(cx->regs().sp, vp);
cx->regs().sp = vp;
if (!cx->regs().fp()->pushBlock(cx, blockObj))
return NULL;
JS_ASSERT(JSOp(pc[JSOP_ENTERBLOCK_LENGTH]) == JSOP_EXCEPTION);
cx->regs().sp[0] = cx->getPendingException();
cx->clearPendingException();
cx->regs().sp++;
cx->regs().pc = pc + JSOP_ENTERBLOCK_LENGTH + JSOP_EXCEPTION_LENGTH;
}
*f.oldregs = f.regs;
return NULL;
}
uint32_t
ion::InvalidationBailout(InvalidationBailoutStack *sp, size_t *frameSizeOut,
BaselineBailoutInfo **bailoutInfo)
{
sp->checkInvariants();
JSContext *cx = GetIonContext()->cx;
// We don't have an exit frame.
cx->mainThread().ionTop = NULL;
IonActivationIterator ionActivations(cx);
IonBailoutIterator iter(ionActivations, sp);
IonActivation *activation = ionActivations.activation();
IonSpew(IonSpew_Bailouts, "Took invalidation bailout! Snapshot offset: %d", iter.snapshotOffset());
// Note: the frame size must be computed before we return from this function.
*frameSizeOut = iter.topFrameSize();
uint32_t retval;
if (IsBaselineEnabled(cx)) {
*bailoutInfo = NULL;
retval = BailoutIonToBaseline(cx, activation, iter, true, bailoutInfo);
JS_ASSERT(retval == BAILOUT_RETURN_BASELINE ||
retval == BAILOUT_RETURN_FATAL_ERROR ||
retval == BAILOUT_RETURN_OVERRECURSED);
JS_ASSERT_IF(retval == BAILOUT_RETURN_BASELINE, *bailoutInfo != NULL);
if (retval != BAILOUT_RETURN_BASELINE) {
IonJSFrameLayout *frame = iter.jsFrame();
IonSpew(IonSpew_Invalidate, "converting to exit frame");
IonSpew(IonSpew_Invalidate, " orig calleeToken %p", (void *) frame->calleeToken());
IonSpew(IonSpew_Invalidate, " orig frameSize %u", unsigned(frame->prevFrameLocalSize()));
IonSpew(IonSpew_Invalidate, " orig ra %p", (void *) frame->returnAddress());
frame->replaceCalleeToken(NULL);
EnsureExitFrame(frame);
IonSpew(IonSpew_Invalidate, " new calleeToken %p", (void *) frame->calleeToken());
IonSpew(IonSpew_Invalidate, " new frameSize %u", unsigned(frame->prevFrameLocalSize()));
IonSpew(IonSpew_Invalidate, " new ra %p", (void *) frame->returnAddress());
}
iter.ionScript()->decref(cx->runtime->defaultFreeOp());
return retval;
} else {
retval = ConvertFrames(cx, activation, iter);
IonJSFrameLayout *frame = iter.jsFrame();
IonSpew(IonSpew_Invalidate, "converting to exit frame");
IonSpew(IonSpew_Invalidate, " orig calleeToken %p", (void *) frame->calleeToken());
IonSpew(IonSpew_Invalidate, " orig frameSize %u", unsigned(frame->prevFrameLocalSize()));
IonSpew(IonSpew_Invalidate, " orig ra %p", (void *) frame->returnAddress());
frame->replaceCalleeToken(NULL);
EnsureExitFrame(frame);
IonSpew(IonSpew_Invalidate, " new calleeToken %p", (void *) frame->calleeToken());
IonSpew(IonSpew_Invalidate, " new frameSize %u", unsigned(frame->prevFrameLocalSize()));
IonSpew(IonSpew_Invalidate, " new ra %p", (void *) frame->returnAddress());
iter.ionScript()->decref(cx->runtime->defaultFreeOp());
// Only need to take ion return override if resuming to interpreter.
if (cx->runtime->hasIonReturnOverride())
cx->regs().sp[-1] = cx->runtime->takeIonReturnOverride();
if (retval != BAILOUT_RETURN_FATAL_ERROR) {
// If invalidation was triggered inside a stub call, we may still have to
// monitor the result, since the bailout happens before the MMonitorTypes
// instruction is executed.
jsbytecode *pc = activation->bailout()->bailoutPc();
// If this is not a ResumeAfter bailout, there's nothing to monitor,
// we will redo the op in the interpreter.
bool isResumeAfter = GetNextPc(pc) == cx->regs().pc;
if ((js_CodeSpec[*pc].format & JOF_TYPESET) && isResumeAfter) {
JS_ASSERT(retval == BAILOUT_RETURN_OK);
return BAILOUT_RETURN_MONITOR;
}
return retval;
}
return BAILOUT_RETURN_FATAL_ERROR;
}
}
/*
* Called when an error is in progress and the topmost frame could not handle
* it. This will unwind to a given frame, or find and align to an exception
* handler in the process.
*/
static inline bool
HandleErrorInExcessFrame(VMFrame &f, StackFrame *stopFp, bool searchedTopmostFrame = true)
{
JSContext *cx = f.cx;
/*
* Callers of this called either Interpret() or JaegerShot(), which would
* have searched for exception handlers already. If we see stopFp, just
* return false. Otherwise, pop the frame, since it's guaranteed useless.
*
* Note that this also guarantees ScriptEpilogue() has been called.
*/
StackFrame *fp = cx->fp();
if (searchedTopmostFrame) {
/*
* This is a special case meaning that fp->finishedInInterpreter() is
* true. If so, and fp == stopFp, our only choice is to propagate this
* error up, back to the method JIT, and then to js_InternalThrow,
* where this becomes a special case. See the comment there and bug
* 624100.
*/
if (fp == stopFp)
return false;
/*
* Otherwise, the protocol here (like Invoke) is to assume that the
* execution mode finished the frame, and to just pop it.
*/
InlineReturn(f);
}
/* Remove the bottom frame. */
bool returnOK = false;
for (;;) {
fp = cx->fp();
/* Clear imacros. */
if (fp->hasImacropc()) {
cx->regs().pc = fp->imacropc();
fp->clearImacropc();
}
JS_ASSERT(!fp->hasImacropc());
/* If there's an exception and a handler, set the pc and leave. */
if (cx->isExceptionPending()) {
jsbytecode *pc = FindExceptionHandler(cx);
if (pc) {
cx->regs().pc = pc;
returnOK = true;
break;
}
}
/* Don't unwind if this was the entry frame. */
if (fp == stopFp)
break;
/* Unwind and return. */
returnOK &= bool(js_UnwindScope(cx, 0, returnOK || cx->isExceptionPending()));
returnOK = ScriptEpilogue(cx, fp, returnOK);
InlineReturn(f);
}
JS_ASSERT(&f.regs == &cx->regs());
JS_ASSERT_IF(!returnOK, cx->fp() == stopFp);
return returnOK;
}
extern "C" void *
js_InternalThrow(VMFrame &f)
{
JSContext *cx = f.cx;
// It's possible that from within RunTracer(), Interpret() returned with
// an error and finished the frame (i.e., called ScriptEpilogue), but has
// not yet performed an inline return.
//
// In this case, RunTracer() has no choice but to propagate the error
// up to the method JIT, and thus to this function. But ScriptEpilogue()
// has already been called. Detect this, and avoid double-finishing the
// frame. See HandleErrorInExcessFrame() and bug 624100.
if (f.fp()->finishedInInterpreter()) {
// If it's the last frame, just propagate the failure up again.
if (f.fp() == f.entryfp)
return NULL;
InlineReturn(f);
}
// Make sure sp is up to date.
JS_ASSERT(&cx->regs() == &f.regs);
jsbytecode *pc = NULL;
for (;;) {
if (cx->isExceptionPending()) {
// Call the throw hook if necessary
JSThrowHook handler = cx->debugHooks->throwHook;
if (handler || !cx->compartment->getDebuggees().empty()) {
Value rval;
JSTrapStatus st = Debugger::onExceptionUnwind(cx, &rval);
if (st == JSTRAP_CONTINUE && handler) {
st = handler(cx, cx->fp()->script(), cx->regs().pc, Jsvalify(&rval),
cx->debugHooks->throwHookData);
}
switch (st) {
case JSTRAP_ERROR:
cx->clearPendingException();
return NULL;
case JSTRAP_RETURN:
cx->clearPendingException();
cx->fp()->setReturnValue(rval);
return cx->jaegerCompartment()->forceReturnFromExternC();
case JSTRAP_THROW:
cx->setPendingException(rval);
break;
default:
break;
}
}
}
pc = FindExceptionHandler(cx);
if (pc)
break;
// The JIT guarantees that ScriptEpilogue() has always been run
// upon exiting to its caller. This is important for consistency,
// where execution modes make similar guarantees about prologues
// and epilogues. RunTracer(), Interpret(), and Invoke() all
// rely on this property.
JS_ASSERT(!f.fp()->finishedInInterpreter());
js_UnwindScope(cx, 0, cx->isExceptionPending());
ScriptEpilogue(f.cx, f.fp(), false);
// Don't remove the last frame, this is the responsibility of
// JaegerShot()'s caller. We only guarantee that ScriptEpilogue()
// has been run.
if (f.entryfp == f.fp())
break;
JS_ASSERT(f.regs.sp == cx->regs().sp);
InlineReturn(f);
}
JS_ASSERT(f.regs.sp == cx->regs().sp);
if (!pc)
return NULL;
StackFrame *fp = cx->fp();
JSScript *script = fp->script();
return script->nativeCodeForPC(fp->isConstructing(), pc);
}
extern "C" void *
js_InternalThrow(VMFrame &f)
{
JSContext *cx = f.cx;
ExpandInlineFrames(cx->compartment);
// The current frame may have an associated orphaned native, if the native
// or SplatApplyArgs threw an exception.
RemoveOrphanedNative(cx, f.fp());
JS_ASSERT(!f.fp()->finishedInInterpreter());
// Make sure sp is up to date.
JS_ASSERT(&cx->regs() == &f.regs);
jsbytecode *pc = NULL;
for (;;) {
if (cx->isExceptionPending()) {
// Call the throw hook if necessary
JSThrowHook handler = cx->debugHooks->throwHook;
if (handler || !cx->compartment->getDebuggees().empty()) {
Value rval;
JSTrapStatus st = Debugger::onExceptionUnwind(cx, &rval);
if (st == JSTRAP_CONTINUE && handler) {
st = handler(cx, cx->fp()->script(), cx->regs().pc, &rval,
cx->debugHooks->throwHookData);
}
switch (st) {
case JSTRAP_ERROR:
cx->clearPendingException();
return NULL;
case JSTRAP_CONTINUE:
break;
case JSTRAP_RETURN:
cx->clearPendingException();
cx->fp()->setReturnValue(rval);
return cx->jaegerCompartment()->forceReturnFromExternC();
case JSTRAP_THROW:
cx->setPendingException(rval);
break;
default:
JS_NOT_REACHED("bad onExceptionUnwind status");
}
}
}
pc = FindExceptionHandler(cx);
if (pc)
break;
// The JIT guarantees that ScriptEpilogue() has always been run
// upon exiting to its caller. This is important for consistency,
// where execution modes make similar guarantees about prologues
// and epilogues. RunTracer(), Interpret(), and Invoke() all
// rely on this property.
JS_ASSERT(!f.fp()->finishedInInterpreter());
UnwindScope(cx, 0, cx->isExceptionPending());
if (cx->compartment->debugMode())
js::ScriptDebugEpilogue(cx, f.fp(), false);
ScriptEpilogue(f.cx, f.fp(), false);
// Don't remove the last frame, this is the responsibility of
// JaegerShot()'s caller. We only guarantee that ScriptEpilogue()
// has been run.
if (f.entryfp == f.fp())
break;
JS_ASSERT(f.regs.sp == cx->regs().sp);
InlineReturn(f);
}
JS_ASSERT(f.regs.sp == cx->regs().sp);
if (!pc)
return NULL;
StackFrame *fp = cx->fp();
JSScript *script = fp->script();
/*
* Fall back to EnterMethodJIT and finish the frame in the interpreter.
* With type inference enabled, we may wipe out all JIT code on the
* stack without patching ncode values to jump to the interpreter, and
* thus can only enter JIT code via EnterMethodJIT (which overwrites
* its entry frame's ncode). See ClearAllFrames.
*/
cx->compartment->jaegerCompartment()->setLastUnfinished(Jaeger_Unfinished);
if (!script->ensureRanAnalysis(cx, NULL)) {
js_ReportOutOfMemory(cx);
return NULL;
}
analyze::AutoEnterAnalysis enter(cx);
cx->regs().pc = pc;
cx->regs().sp = fp->base() + script->analysis()->getCode(pc).stackDepth;
/*
* Interpret the ENTERBLOCK and EXCEPTION opcodes, so that we don't go
* back into the interpreter with a pending exception. This will cause
* it to immediately rethrow.
*/
if (cx->isExceptionPending()) {
JS_ASSERT(JSOp(*pc) == JSOP_ENTERBLOCK);
JSObject *obj = script->getObject(GET_SLOTNO(pc));
Value *vp = cx->regs().sp + OBJ_BLOCK_COUNT(cx, obj);
SetValueRangeToUndefined(cx->regs().sp, vp);
cx->regs().sp = vp;
JS_ASSERT(JSOp(pc[JSOP_ENTERBLOCK_LENGTH]) == JSOP_EXCEPTION);
cx->regs().sp[0] = cx->getPendingException();
cx->clearPendingException();
cx->regs().sp++;
cx->regs().pc = pc + JSOP_ENTERBLOCK_LENGTH + JSOP_EXCEPTION_LENGTH;
}
*f.oldregs = f.regs;
return NULL;
}
