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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_SANDBOX_SANDBOXED_POINTER_INL_H_
#define V8_SANDBOX_SANDBOXED_POINTER_INL_H_
#include "include/v8-internal.h"
#include "src/common/ptr-compr-inl.h"
#include "src/sandbox/sandbox.h"
#include "src/sandbox/sandboxed-pointer.h"
namespace v8 {
namespace internal {
V8_INLINE Address ReadSandboxedPointerField(Address field_address,
PtrComprCageBase cage_base) {
#ifdef V8_ENABLE_SANDBOX
SandboxedPointer_t sandboxed_pointer =
base::ReadUnalignedValue<SandboxedPointer_t>(field_address);
Address offset = sandboxed_pointer >> kSandboxedPointerShift;
Address pointer = cage_base.address() + offset;
return pointer;
#else
return ReadMaybeUnalignedValue<Address>(field_address);
#endif
}
V8_INLINE void WriteSandboxedPointerField(Address field_address,
PtrComprCageBase cage_base,
Address pointer) {
#ifdef V8_ENABLE_SANDBOX
// The pointer must point into the sandbox.
CHECK(GetProcessWideSandbox()->Contains(pointer));
Address offset = pointer - cage_base.address();
SandboxedPointer_t sandboxed_pointer = offset << kSandboxedPointerShift;
base::WriteUnalignedValue<SandboxedPointer_t>(field_address,
sandboxed_pointer);
#else
WriteMaybeUnalignedValue<Address>(field_address, pointer);
#endif
}
} // namespace internal
} // namespace v8
#endif // V8_SANDBOX_SANDBOXED_POINTER_INL_H_
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