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// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_COMMON_EXTERNAL_POINTER_H_
#define V8_COMMON_EXTERNAL_POINTER_H_
#include "src/common/globals.h"
namespace v8 {
namespace internal {
// See v8:10391 for details about V8 heap sandbox.
constexpr uint32_t kExternalPointerSalt =
0x7fffffff & ~static_cast<uint32_t>(kHeapObjectTagMask);
static_assert(static_cast<int32_t>(kExternalPointerSalt) >= 0,
"Salt value must be positive for better assembly code");
// Convert external pointer value into encoded form suitable for being stored
// on V8 heap.
V8_INLINE ExternalPointer_t EncodeExternalPointer(Isolate* isolate,
Address external_pointer);
// Convert external pointer from on-V8-heap representation to an actual external
// pointer value.
V8_INLINE Address DecodeExternalPointer(const Isolate* isolate,
ExternalPointer_t encoded_pointer);
} // namespace internal
} // namespace v8
#endif // V8_COMMON_EXTERNAL_POINTER_H_
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