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IsoHeap.h
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152 lines (124 loc) · 4.43 KB
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/*
* Copyright (C) 2017-2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "IsoConfig.h"
#include "Mutex.h"
#if BUSE(LIBPAS)
#include "bmalloc_heap_ref.h"
#endif
#if BENABLE_MALLOC_HEAP_BREAKDOWN
#include <malloc/malloc.h>
#endif
namespace bmalloc {
template<typename Config> class IsoHeapImpl;
namespace api {
// You have to declare IsoHeaps this way:
//
// static IsoHeap<type> myTypeHeap;
//
// It's not valid to create an IsoHeap except in static storage.
#if BUSE(LIBPAS)
BEXPORT void* isoAllocate(pas_heap_ref& heapRef);
BEXPORT void* isoTryAllocate(pas_heap_ref& heapRef);
BEXPORT void isoDeallocate(void* ptr);
// The name "LibPasBmallocHeapType" is important for the pas_status_reporter to work right.
template<typename LibPasBmallocHeapType>
struct IsoHeap {
constexpr IsoHeap(const char* = nullptr) { }
void* allocate()
{
return isoAllocate(provideHeap());
}
void* tryAllocate()
{
return isoTryAllocate(provideHeap());
}
void deallocate(void* p)
{
isoDeallocate(p);
}
void scavenge()
{
}
void initialize()
{
}
bool isInitialized()
{
return true;
}
static pas_heap_ref& provideHeap()
{
static const bmalloc_type type = BMALLOC_TYPE_INITIALIZER(sizeof(LibPasBmallocHeapType), alignof(LibPasBmallocHeapType), __PRETTY_FUNCTION__);
static pas_heap_ref heap = BMALLOC_HEAP_REF_INITIALIZER(&type);
return heap;
}
};
#else // BUSE(LIBPAS) -> so !BUSE(LIBPAS)
template<typename Type>
struct IsoHeap {
typedef IsoConfig<sizeof(Type)> Config;
#if BENABLE_MALLOC_HEAP_BREAKDOWN
IsoHeap(const char* = nullptr);
#else
constexpr IsoHeap(const char* = nullptr) { }
#endif
void* allocate();
void* tryAllocate();
void deallocate(void* p);
void scavenge();
void initialize();
bool isInitialized();
unsigned allocatorOffset() { return m_allocatorOffsetPlusOne - 1; }
void setAllocatorOffset(unsigned value) { m_allocatorOffsetPlusOne = value + 1; }
unsigned deallocatorOffset() { return m_deallocatorOffsetPlusOne - 1; }
void setDeallocatorOffset(unsigned value) { m_deallocatorOffsetPlusOne = value + 1; }
IsoHeapImpl<Config>& impl();
Mutex m_initializationLock;
unsigned m_allocatorOffsetPlusOne { 0 };
unsigned m_deallocatorOffsetPlusOne { 0 };
IsoHeapImpl<Config>* m_impl { nullptr };
#if BENABLE_MALLOC_HEAP_BREAKDOWN
malloc_zone_t* m_zone;
#endif
};
#endif // BUSE(LIBPAS) -> so end of !BUSE(LIBPAS)
// Use this together with MAKE_BISO_MALLOCED_IMPL.
#define MAKE_BISO_MALLOCED(isoType, exportMacro) \
public: \
static exportMacro ::bmalloc::api::IsoHeap<isoType>& bisoHeap(); \
\
void* operator new(size_t, void* p) { return p; } \
void* operator new[](size_t, void* p) { return p; } \
\
exportMacro void* operator new(size_t size);\
exportMacro void operator delete(void* p);\
\
void* operator new[](size_t size) = delete; \
void operator delete[](void* p) = delete; \
using webkitFastMalloced = int; \
private: \
using __makeBisoMallocedMacroSemicolonifier BUNUSED_TYPE_ALIAS = int
} } // namespace bmalloc::api