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;
}
bool report(Census &census, MutableHandleValue report) {
JSContext *cx = census.cx;
RootedObject obj(cx, NewBuiltinClassInstance(cx, &JSObject::class_));
if (!obj)
return false;
for (typename Table::Range r = table.all(); !r.empty(); r.popFront()) {
EachType &entry = r.front().value();
RootedValue entryReport(cx);
if (!entry.report(census, &entryReport))
return false;
const jschar *name = r.front().key();
MOZ_ASSERT(name);
JSAtom *atom = AtomizeChars(cx, name, js_strlen(name));
if (!atom)
return false;
RootedId entryId(cx, AtomToId(atom));
if (!JSObject::defineGeneric(cx, obj, entryId, entryReport))
return false;
}
report.setObject(*obj);
return true;
}
