memory-chunk-inl.h

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// Copyright 2024 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_HEAP_MEMORY_CHUNK_INL_H_
#define V8_HEAP_MEMORY_CHUNK_INL_H_
 
#include "src/heap/memory-chunk.h"
// Include the non-inl header before the rest of the headers.
 
#include "src/heap/memory-chunk-metadata.h"
#include "src/sandbox/check.h"
 
namespace v8 {
namespace internal {
 
MemoryChunkMetadata* MemoryChunk::Metadata() {
  // If this changes, we also need to update
  // CodeStubAssembler::PageMetadataFromMemoryChunk
#ifdef V8_ENABLE_SANDBOX
  DCHECK_LT(metadata_index_,
            MemoryChunkConstants::kMetadataPointerTableSizeMask);
  MemoryChunkMetadata** metadata_pointer_table =
      IsolateGroup::current()->metadata_pointer_table();
  MemoryChunkMetadata* metadata = metadata_pointer_table
      [metadata_index_ & MemoryChunkConstants::kMetadataPointerTableSizeMask];
  // Check that the Metadata belongs to this Chunk, since an attacker with write
  // inside the sandbox could've swapped the index.
  SBXCHECK_EQ(metadata->Chunk(), this);
  return metadata;
#else
  return metadata_;
#endif
}
 
const MemoryChunkMetadata* MemoryChunk::Metadata() const {
  return const_cast<MemoryChunk*>(this)->Metadata();
}
 
Heap* MemoryChunk::GetHeap() { return Metadata()->heap(); }
 
}  // namespace internal
}  // namespace v8
 
#endif  // V8_HEAP_MEMORY_CHUNK_INL_H_