Function gjs_dump_heap

modules/system.cpp:111–131

This can reduce performance, so should be used for debugging only. js::CollectNurseryBeforeDump() promotes any live objects in the nursery to the tenured heap. This is slow, but this way, we are certain to get an accurate picture of the heap.

// the tenured heap. This is slow, but this way, we are certain to get an
// accurate picture of the heap.
static bool gjs_dump_heap(JSContext* cx, unsigned argc, JS::Value* vp) {
    JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
    Gjs::AutoChar filename;

    if (!gjs_parse_call_args(cx, "dumpHeap", args, "|F", "filename", &filename))
        return false;

    LogFile file(filename);
    if (file.has_error()) {
        gjs_throw(cx, "Cannot dump heap to %s: %s", filename.get(),
                  file.errmsg());
        return false;
    }
    js::DumpHeap(cx, file.fp(), js::CollectNurseryBeforeDump);

    gjs_debug(GJS_DEBUG_CONTEXT, "Heap dumped to %s",
              filename ? filename.get() : "stdout");

    args.rval().setUndefined();
    return true;
}

static bool gjs_gc(JSContext* cx, unsigned argc, JS::Value* vp) {
    JS::CallArgs args = JS::CallArgsFromVp(argc, vp);