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// Copyright 2018 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_WASM_WASM_IMPORT_WRAPPER_CACHE_H_
#define V8_WASM_WASM_IMPORT_WRAPPER_CACHE_H_
#include "src/base/platform/mutex.h"
#include "src/compiler/wasm-compiler.h"
namespace v8 {
namespace internal {
class Counters;
namespace wasm {
class WasmCode;
class WasmEngine;
using FunctionSig = Signature<ValueType>;
// Implements a cache for import wrappers.
class WasmImportWrapperCache {
public:
using CacheKey = std::pair<compiler::WasmImportCallKind, FunctionSig*>;
class CacheKeyHash {
public:
size_t operator()(const CacheKey& key) const {
return base::hash_combine(static_cast<uint8_t>(key.first), *key.second);
}
};
// Helper class to modify the cache under a lock.
class ModificationScope {
public:
explicit ModificationScope(WasmImportWrapperCache* cache)
: cache_(cache), guard_(&cache->mutex_) {}
V8_EXPORT_PRIVATE WasmCode*& operator[](const CacheKey& key);
private:
WasmImportWrapperCache* const cache_;
base::MutexGuard guard_;
};
// Not thread-safe, use ModificationScope to get exclusive write access to the
// cache.
V8_EXPORT_PRIVATE WasmCode*& operator[](const CacheKey& key);
// Assumes the key exists in the map.
V8_EXPORT_PRIVATE WasmCode* Get(compiler::WasmImportCallKind kind,
FunctionSig* sig) const;
~WasmImportWrapperCache();
private:
base::Mutex mutex_;
std::unordered_map<CacheKey, WasmCode*, CacheKeyHash> entry_map_;
};
} // namespace wasm
} // namespace internal
} // namespace v8
#endif // V8_WASM_WASM_IMPORT_WRAPPER_CACHE_H_