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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef builtin_WeakMapObject_inl_h
#define builtin_WeakMapObject_inl_h
#include "builtin/WeakMapObject.h"
#include "js/friend/ErrorMessages.h" // js::GetErrorMessage, JSMSG_*
#include "js/Prefs.h"
#include "js/Wrapper.h"
#include "gc/WeakMap-inl.h"
#include "vm/JSObject-inl.h"
namespace js {
static bool TryPreserveReflector(JSContext* cx, HandleObject obj) {
if (!MaybePreserveDOMWrapper(cx, obj)) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
JSMSG_BAD_WEAKMAP_KEY);
return false;
}
return true;
}
static MOZ_ALWAYS_INLINE bool WeakCollectionPutEntryInternal(
JSContext* cx, Handle<WeakCollectionObject*> obj, HandleValue key,
HandleValue value) {
ValueValueWeakMap* map = obj->getMap();
if (!map) {
auto newMap = cx->make_unique<ValueValueWeakMap>(cx, obj.get());
if (!newMap) {
return false;
}
map = newMap.release();
InitReservedSlot(obj, WeakCollectionObject::DataSlot, map,
MemoryUse::WeakMapObject);
}
if (key.isObject()) {
RootedObject keyObj(cx, &key.toObject());
// Preserve wrapped native keys to prevent wrapper optimization.
if (!TryPreserveReflector(cx, keyObj)) {
return false;
}
RootedObject delegate(cx, UncheckedUnwrapWithoutExpose(keyObj));
if (delegate && !TryPreserveReflector(cx, delegate)) {
return false;
}
}
MOZ_ASSERT_IF(key.isObject(),
key.toObject().compartment() == obj->compartment());
MOZ_ASSERT_IF(value.isGCThing(),
gc::ToMarkable(value)->zoneFromAnyThread() == obj->zone() ||
gc::ToMarkable(value)->zoneFromAnyThread()->isAtomsZone());
MOZ_ASSERT_IF(value.isObject(),
value.toObject().compartment() == obj->compartment());
if (!map->put(key, value)) {
JS_ReportOutOfMemory(cx);
return false;
}
return true;
}
// https://tc39.es/ecma262/#sec-canbeheldweakly
static MOZ_ALWAYS_INLINE bool CanBeHeldWeakly(JSContext* cx,
HandleValue value) {
// 1. If v is an Object, return true.
if (value.isObject()) {
return true;
}
#ifdef NIGHTLY_BUILD
bool symbolsAsWeakMapKeysEnabled =
JS::Prefs::experimental_symbols_as_weakmap_keys();
// 2. If v is a Symbol and KeyForSymbol(v) is undefined, return true.
if (symbolsAsWeakMapKeysEnabled && value.isSymbol() &&
value.toSymbol()->code() != JS::SymbolCode::InSymbolRegistry) {
return true;
}
#endif
// 3. Return false.
return false;
}
} // namespace js
#endif /* builtin_WeakMapObject_inl_h */
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