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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_INL_H_
#define V8_SANDBOX_INDIRECT_POINTER_INL_H_
#include "include/v8-internal.h"
#include "src/base/atomic-utils.h"
#include "src/execution/isolate.h"
#include "src/sandbox/code-pointer-table-inl.h"
#include "src/sandbox/indirect-pointer-table-inl.h"
#include "src/sandbox/indirect-pointer.h"
namespace v8 {
namespace internal {
#ifdef V8_ENABLE_SANDBOX
template <IndirectPointerTag tag>
V8_INLINE Tagged<Object> ReadIndirectPointerField(Address field_address,
const Isolate* isolate) {
auto location = reinterpret_cast<IndirectPointerHandle*>(field_address);
IndirectPointerHandle handle = base::AsAtomic32::Relaxed_Load(location);
DCHECK_NE(handle, kNullIndirectPointerHandle);
if constexpr (tag == kCodeIndirectPointerTag) {
// These are special as they use the code pointer table, not the indirect
// pointer table.
// Here we assume that the load from the table cannot be reordered before
// the load of the code object pointer due to the data dependency between
// the two loads and therefore use relaxed memory ordering, but technically
// we should use memory_order_consume here.
CodePointerTable* table = GetProcessWideCodePointerTable();
return Tagged<Object>(table->GetCodeObject(handle));
}
const IndirectPointerTable& table = isolate->indirect_pointer_table();
return Tagged<Object>(table.Get(handle));
}
#endif // V8_ENABLE_SANDBOX
//
} // namespace internal
} // namespace v8
#endif // V8_SANDBOX_INDIRECT_POINTER_INL_H_
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