SkSLMemoryPool.h

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/*
 * Copyright 2020 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef SKSL_MEMORYPOOL
#define SKSL_MEMORYPOOL
 
#include <memory>
 
#include "include/core/SkTypes.h"
#include "src/base/SkArenaAlloc.h"
 
namespace SkSL {
 
class MemoryPool {
public:
    static std::unique_ptr<MemoryPool> Make() {
        return std::make_unique<MemoryPool>();
    }
    void* allocate(size_t size) {
        return fArena.makeBytesAlignedTo(size, kAlignment);
    }
    void release(void*) {
        // SkArenaAlloc does not ever attempt to reclaim space.
    }
 
private:
#ifdef SK_FORCE_8_BYTE_ALIGNMENT
    // https://github.com/emscripten-core/emscripten/issues/10072
    // Since Skia does not use "long double" (16 bytes), we should be ok to force it back to 8 bytes
    // until emscripten is fixed.
    static constexpr size_t kAlignment = 8;
#else
    // Guaranteed alignment of pointer returned by allocate().
    static constexpr size_t kAlignment = alignof(std::max_align_t);
#endif
 
    SkSTArenaAlloc<65536> fArena{/*firstHeapAllocation=*/32768};
};
 
}  // namespace SkSL
 
#endif // SKSL_MEMORYPOOL