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// Copyright 2023 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_SANDBOX_INDIRECT_POINTER_H_
#define V8_SANDBOX_INDIRECT_POINTER_H_
#include "src/common/globals.h"
#include "src/sandbox/indirect-pointer-tag.h"
namespace v8 {
namespace internal {
// Indirect pointers.
//
// An indirect pointer references a HeapObject (like a tagged pointer), but
// does so through a pointer table indirection. Indirect pointers are used when
// the sandbox is enabled to reference objects _outside_ of the sandbox in a
// memory-safe way. For that, each indirect pointer has an associated
// IndirectPointerTag which encodes the type of the referenced object. The
// indirect pointer table (IPT) then ensures that the tag of the pointer
// matches the type of the referenced object, or else the pointer will be
// invalid (it cannot be dereferenced).
// Reads the IndirectPointerHandle from the field and loads the Object
// referenced by this handle from the pointer table. The given
// IndirectPointerTag specifies the expected type of object.
//
// Only available when the sandbox is enabled.
template <IndirectPointerTag tag>
V8_INLINE Object ReadIndirectPointerField(Address field_address,
const Isolate* isolate);
} // namespace internal
} // namespace v8
#endif // V8_SANDBOX_INDIRECT_POINTER_H_
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