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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_COMPILER_UTILS_ATOMIC_DEX_REF_MAP_H_
#define ART_COMPILER_UTILS_ATOMIC_DEX_REF_MAP_H_
#include "base/atomic.h"
#include "base/dchecked_vector.h"
#include "base/macros.h"
#include "base/safe_map.h"
#include "dex/dex_file_reference.h"
namespace art HIDDEN {
class DexFile;
// Used by CompilerCallbacks to track verification information from the Runtime.
template <typename DexFileReferenceType, typename Value>
class AtomicDexRefMap {
public:
AtomicDexRefMap() {}
~AtomicDexRefMap() {}
// Atomically swap the element in if the existing value matches expected.
enum InsertResult {
kInsertResultInvalidDexFile,
kInsertResultCASFailure,
kInsertResultSuccess,
};
InsertResult Insert(const DexFileReferenceType& ref,
const Value& expected,
const Value& desired);
// Retreive an item, returns false if the dex file is not added.
bool Get(const DexFileReferenceType& ref, Value* out) const;
// Remove an item and return the existing value. Returns false if the dex file is not added.
bool Remove(const DexFileReferenceType& ref, Value* out);
// Dex files must be added before method references belonging to them can be used as keys. Not
// thread safe.
void AddDexFile(const DexFile* dex_file);
void AddDexFiles(const std::vector<const DexFile*>& dex_files);
// Return a vector of all dex files which were added to the map.
std::vector<const DexFile*> GetDexFiles() const;
bool HaveDexFile(const DexFile* dex_file) const {
return arrays_.find(dex_file) != arrays_.end();
}
// Visit all of the dex files and elements.
template <typename Visitor>
void Visit(const Visitor& visitor);
void ClearEntries();
private:
// Verified methods. The method array is fixed to avoid needing a lock to extend it.
using ElementArray = dchecked_vector<Atomic<Value>>;
using DexFileArrays = SafeMap<const DexFile*, ElementArray>;
const ElementArray* GetArray(const DexFile* dex_file) const;
ElementArray* GetArray(const DexFile* dex_file);
static size_t NumberOfDexIndices(const DexFile* dex_file);
DexFileArrays arrays_;
};
} // namespace art
#endif // ART_COMPILER_UTILS_ATOMIC_DEX_REF_MAP_H_