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/*
* Copyright 2015 WebAssembly Community Group participants
*
* 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 wasm_mixed_arena_h
#define wasm_mixed_arena_h
#include <vector>
#include "support/threads.h"
//
// Arena allocation for mixed-type data.
//
struct MixedArena {
std::vector<char*> chunks;
int index; // in last chunk
template<class T>
T* alloc() {
// this structure should not be modified by multiple threads at once.
assert(!wasm::ThreadPool::isRunning());
const size_t CHUNK = 10000;
size_t currSize = (sizeof(T) + 7) & (-8); // same alignment as malloc TODO optimize?
assert(currSize < CHUNK);
if (chunks.size() == 0 || index + currSize >= CHUNK) {
chunks.push_back(new char[CHUNK]);
index = 0;
}
T* ret = (T*)(chunks.back() + index);
index += currSize;
new (ret) T();
return ret;
}
void clear() {
assert(!wasm::ThreadPool::isRunning());
for (char* chunk : chunks) {
delete[] chunk;
}
chunks.clear();
}
~MixedArena() {
clear();
}
};
extern MixedArena globalAllocator;
#endif // wasm_mixed_arena_h
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