RematerializedFrame::RematerializedFrame(JSContext *cx, uint8_t *top, unsigned numActualArgs,
InlineFrameIterator &iter, MaybeReadFallback &fallback)
: prevUpToDate_(false),
isDebuggee_(iter.script()->isDebuggee()),
top_(top),
pc_(iter.pc()),
frameNo_(iter.frameNo()),
numActualArgs_(numActualArgs),
script_(iter.script())
{
CopyValueToRematerializedFrame op(slots_);
iter.readFrameArgsAndLocals(cx, op, op, &scopeChain_, &hasCallObj_, &returnValue_,
&argsObj_, &thisValue_, ReadFrame_Actuals,
fallback);
}
static void
CloseLiveIterators(JSContext *cx, const InlineFrameIterator &frame)
{
AssertCanGC();
RootedScript script(cx, frame.script());
jsbytecode *pc = frame.pc();
if (!script->hasTrynotes())
return;
JSTryNote *tn = script->trynotes()->vector;
JSTryNote *tnEnd = tn + script->trynotes()->length;
uint32 pcOffset = uint32(pc - script->main());
for (; tn != tnEnd; ++tn) {
if (pcOffset < tn->start)
continue;
if (pcOffset >= tn->start + tn->length)
continue;
if (tn->kind != JSTRY_ITER)
continue;
JS_ASSERT(JSOp(*(script->main() + tn->start + tn->length)) == JSOP_ENDITER);
JS_ASSERT(tn->stackDepth > 0);
uint32 localSlot = tn->stackDepth;
CloseLiveIterator(cx, frame, localSlot);
}
}
RematerializedFrame::RematerializedFrame(ThreadSafeContext *cx, uint8_t *top,
InlineFrameIterator &iter)
: prevUpToDate_(false),
top_(top),
frameNo_(iter.frameNo()),
numActualArgs_(iter.numActualArgs()),
script_(iter.script())
{
CopyValueToRematerializedFrame op(slots_);
iter.readFrameArgsAndLocals(cx, op, op, &scopeChain_, &returnValue_,
&argsObj_, &thisValue_, ReadFrame_Actuals);
}
RematerializedFrame::RematerializedFrame(JSContext* cx, uint8_t* top, unsigned numActualArgs,
InlineFrameIterator& iter, MaybeReadFallback& fallback)
: prevUpToDate_(false),
isDebuggee_(iter.script()->isDebuggee()),
isConstructing_(iter.isConstructing()),
hasCachedSavedFrame_(false),
top_(top),
pc_(iter.pc()),
frameNo_(iter.frameNo()),
numActualArgs_(numActualArgs),
script_(iter.script())
{
if (iter.isFunctionFrame())
callee_ = iter.callee(fallback);
else
callee_ = nullptr;
CopyValueToRematerializedFrame op(slots_);
iter.readFrameArgsAndLocals(cx, op, op, &scopeChain_, &hasCallObj_, &returnValue_,
&argsObj_, &thisArgument_, ReadFrame_Actuals,
fallback);
}
static void
CloseLiveIterator(JSContext *cx, const InlineFrameIterator &frame, uint32 localSlot)
{
SnapshotIterator si = frame.snapshotIterator();
// Skip stack slots until we reach the iterator object.
uint32 base = CountArgSlots(frame.maybeCallee()) + frame.script()->nfixed;
uint32 skipSlots = base + localSlot - 1;
for (unsigned i = 0; i < skipSlots; i++)
si.skip();
Value v = si.read();
JSObject *obj = &v.toObject();
if (cx->isExceptionPending())
UnwindIteratorForException(cx, obj);
else
UnwindIteratorForUncatchableException(cx, obj);
}