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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/. */
/*
* Shadow definition of |js::BaseShape| and |js::Shape| innards. Do not use
* this directly!
*/
#ifndef js_shadow_Shape_h
#define js_shadow_Shape_h
#include <stdint.h> // uint32_t
#include "jstypes.h" // JS_PUBLIC_API
#include "js/Id.h" // JS::PropertyKey
struct JSClass;
class JS_PUBLIC_API JSObject;
namespace JS {
namespace shadow {
struct BaseShape {
const JSClass* clasp;
JS::Realm* realm;
};
class Shape {
public:
shadow::BaseShape* base;
uint32_t immutableFlags;
enum class Kind : uint8_t {
// SharedShape or DictionaryShape for NativeObject.
// (Only) these two kinds must have the low bit set, to allow for fast
// is-native checking.
Shared = 1,
Dictionary = 3,
// ProxyShape for ProxyObject.
Proxy = 0,
// WasmGCShape for WasmGCObject.
WasmGC = 2,
};
static constexpr uint32_t KIND_SHIFT = 4;
static constexpr uint32_t KIND_MASK = 0b11;
static constexpr uint32_t FIXED_SLOTS_SHIFT = 6;
static constexpr uint32_t FIXED_SLOTS_MASK = 0x1f << FIXED_SLOTS_SHIFT;
bool isProxy() const {
return Kind((immutableFlags >> KIND_SHIFT) & KIND_MASK) == Kind::Proxy;
}
};
} // namespace shadow
} // namespace JS
#endif // js_shadow_Shape_h
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