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49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef DOM_BINDINGS_PINNEDSTRINGID_H_
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#define DOM_BINDINGS_PINNEDSTRINGID_H_
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#include "js/GCAnnotations.h"
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#include "js/Id.h"
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#include "js/RootingAPI.h"
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#include "js/String.h"
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#include "jsapi.h"
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class JSString;
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struct JSContext;
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namespace mozilla::dom {
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/*
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* Holds a jsid that is initialized to a pinned string, with automatic
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* conversion to Handle<jsid>, as it is held live forever by pinning.
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*/
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class PinnedStringId {
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jsid id;
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public:
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constexpr PinnedStringId() : id(JS::PropertyKey::Void()) {}
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bool init(JSContext* cx, const char* string) {
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JSString* str = JS_AtomizeAndPinString(cx, string);
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if (!str) {
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return false;
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}
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id = JS::PropertyKey::fromPinnedString(str);
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return true;
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}
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operator const jsid&() const { return id; }
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operator JS::Handle<jsid>() const {
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/* This is safe because we have pinned the string. */
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return JS::Handle<jsid>::fromMarkedLocation(&id);
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}
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} JS_HAZ_ROOTED;
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} // namespace mozilla::dom
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#endif
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