bool
SavedStacks::insertFrames(JSContext *cx, ScriptFrameIter &iter, MutableHandle<SavedFrame*> frame)
{
if (iter.done()) {
frame.set(nullptr);
return true;
}
ScriptFrameIter thisFrame(iter);
Rooted<SavedFrame*> parentFrame(cx);
if (!insertFrames(cx, ++iter, &parentFrame))
return false;
RootedScript script(cx, thisFrame.script());
RootedFunction callee(cx, thisFrame.maybeCallee());
const char *filename = script->filename();
RootedAtom source(cx, Atomize(cx, filename, strlen(filename)));
if (!source)
return false;
uint32_t column;
uint32_t line = PCToLineNumber(script, thisFrame.pc(), &column);
SavedFrame::Lookup lookup(source,
line,
column,
callee ? callee->displayAtom() : nullptr,
parentFrame,
thisFrame.compartment()->principals);
frame.set(getOrCreateSavedFrame(cx, lookup));
return frame.address() != nullptr;
}
bool
SavedStacks::getLocation(JSContext *cx, const FrameIter &iter, MutableHandleLocationValue locationp)
{
// We should only ever be caching location values for scripts in this
// compartment. Otherwise, we would get dead cross-compartment scripts in
// the cache because our compartment's sweep method isn't called when their
// compartment gets collected.
assertSameCompartment(cx, this, iter.compartment());
// When we have a |JSScript| for this frame, use a potentially memoized
// location from our PCLocationMap and copy it into |locationp|. When we do
// not have a |JSScript| for this frame (asm.js frames), we take a slow path
// that doesn't employ memoization, and update |locationp|'s slots directly.
if (!iter.hasScript()) {
if (const char16_t *displayURL = iter.scriptDisplayURL()) {
locationp->source = AtomizeChars(cx, displayURL, js_strlen(displayURL));
} else {
const char *filename = iter.scriptFilename() ? iter.scriptFilename() : "";
locationp->source = Atomize(cx, filename, strlen(filename));
}
if (!locationp->source)
return false;
locationp->line = iter.computeLine(&locationp->column);
return true;
}
RootedScript script(cx, iter.script());
jsbytecode *pc = iter.pc();
PCKey key(script, pc);
PCLocationMap::AddPtr p = pcLocationMap.lookupForAdd(key);
if (!p) {
RootedAtom source(cx);
if (const char16_t *displayURL = iter.scriptDisplayURL()) {
source = AtomizeChars(cx, displayURL, js_strlen(displayURL));
} else {
const char *filename = script->filename() ? script->filename() : "";
source = Atomize(cx, filename, strlen(filename));
}
if (!source)
return false;
uint32_t column;
uint32_t line = PCToLineNumber(script, pc, &column);
LocationValue value(source, line, column);
if (!pcLocationMap.add(p, key, value))
return false;
}
locationp.set(p->value());
return true;
}