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// Copyright 2021 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_SECURITY_CAGED_POINTER_INL_H_
#define V8_SECURITY_CAGED_POINTER_INL_H_
#include "include/v8-internal.h"
#include "src/execution/isolate.h"
#include "src/security/caged-pointer.h"
namespace v8 {
namespace internal {
#ifdef V8_CAGED_POINTERS
V8_INLINE CagedPointer_t ReadCagedPointerField(Address field_address,
PtrComprCageBase cage_base) {
// Caged pointers are currently only used if the sandbox is enabled.
DCHECK(V8_HEAP_SANDBOX_BOOL);
Address caged_pointer = base::ReadUnalignedValue<Address>(field_address);
Address offset = caged_pointer >> kCagedPointerShift;
Address pointer = cage_base.address() + offset;
return pointer;
}
V8_INLINE void WriteCagedPointerField(Address field_address,
PtrComprCageBase cage_base,
CagedPointer_t pointer) {
// Caged pointers are currently only used if the sandbox is enabled.
DCHECK(V8_HEAP_SANDBOX_BOOL);
// The pointer must point into the virtual memory cage.
DCHECK(GetProcessWideVirtualMemoryCage()->Contains(pointer));
Address offset = pointer - cage_base.address();
Address caged_pointer = offset << kCagedPointerShift;
base::WriteUnalignedValue<Address>(field_address, caged_pointer);
}
#endif // V8_CAGED_POINTERS
} // namespace internal
} // namespace v8
#endif // V8_SECURITY_CAGED_POINTER_INL_H_
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