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// Copyright 2022 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.
#if !V8_ENABLE_WEBASSEMBLY
#error This header should only be included if WebAssembly is enabled.
#endif // !V8_ENABLE_WEBASSEMBLY
#ifndef V8_WASM_ASSEMBLER_BUFFER_CACHE_H_
#define V8_WASM_ASSEMBLER_BUFFER_CACHE_H_
#include <memory>
#include "src/wasm/wasm-code-manager.h"
namespace v8::internal {
class AssemblerBuffer;
}
namespace v8::internal::wasm {
class CachedAssemblerBuffer;
// Creating assembler buffers can be expensive, in particular if PKU is used,
// which requires an {mmap} and {pkey_protect} system call for each new buffer.
// Hence pool-allocate a larger memory region and reuse it if assembler buffers
// are freed.
class AssemblerBufferCache final {
public:
~AssemblerBufferCache();
std::unique_ptr<AssemblerBuffer> GetAssemblerBuffer(int size);
private:
friend class CachedAssemblerBuffer;
// Called when CachedAssemblerBuffers get destroyed, to return memory to the
// cache.
void Return(base::AddressRegion);
DisjointAllocationPool available_memory_;
int total_allocated_ = 0;
};
} // namespace v8::internal::wasm
#endif // V8_WASM_ASSEMBLER_BUFFER_CACHE_H_
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