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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 {
// 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,
ExternalPointerTag tag);
constexpr ExternalPointer_t kNullExternalPointer = 0;
// Creates uninitialized entry in external pointer table and writes the entry id
// to the field.
// When sandbox is not enabled, it's a no-op.
V8_INLINE void InitExternalPointerField(Address field_address,
Isolate* isolate);
// Creates and initializes entry in external pointer table and writes the entry
// id to the field.
// Basically, it's InitExternalPointerField() followed by
// WriteExternalPointerField().
V8_INLINE void InitExternalPointerField(Address field_address, Isolate* isolate,
Address value, ExternalPointerTag tag);
// Reads external pointer for the field, and decodes it if the sandbox is
// enabled.
V8_INLINE Address ReadExternalPointerField(Address field_address,
const Isolate* isolate,
ExternalPointerTag tag);
// Encodes value if the sandbox is enabled and writes it into the field.
V8_INLINE void WriteExternalPointerField(Address field_address,
Isolate* isolate, Address value,
ExternalPointerTag tag);
} // namespace internal
} // namespace v8
#endif // V8_COMMON_EXTERNAL_POINTER_H_
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