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/*
* Copyright (C) 2013 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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.
*/
#ifndef Partitions_h
#define Partitions_h
#include "base/allocator/partition_allocator/partition_alloc.h"
#include "base/synchronization/spin_lock.h"
#include "wtf/Assertions.h"
#include "wtf/WTF.h"
#include "wtf/WTFExport.h"
#include <string.h>
namespace WTF {
class WTF_EXPORT Partitions {
public:
typedef void (*ReportPartitionAllocSizeFunction)(size_t);
// Name of allocator used by tracing for marking sub-allocations while take
// memory snapshots.
static const char* const kAllocatedObjectPoolName;
static void initialize(ReportPartitionAllocSizeFunction);
ALWAYS_INLINE static base::PartitionRootGeneric* bufferPartition() {
DCHECK(s_initialized);
return m_bufferAllocator.root();
}
ALWAYS_INLINE static base::PartitionRootGeneric* fastMallocPartition() {
DCHECK(s_initialized);
return m_fastMallocAllocator.root();
}
ALWAYS_INLINE static base::PartitionRoot* nodePartition() {
NOTREACHED();
return nullptr;
}
ALWAYS_INLINE static base::PartitionRoot* layoutPartition() {
DCHECK(s_initialized);
return m_layoutAllocator.root();
}
static size_t currentDOMMemoryUsage() {
NOTREACHED();
return 0;
}
static size_t totalSizeOfCommittedPages() {
size_t totalSize = 0;
totalSize += m_fastMallocAllocator.root()->total_size_of_committed_pages;
totalSize += m_bufferAllocator.root()->total_size_of_committed_pages;
totalSize += m_layoutAllocator.root()->total_size_of_committed_pages;
return totalSize;
}
static void decommitFreeableMemory();
static void reportMemoryUsageHistogram();
static void dumpMemoryStats(bool isLightDump, base::PartitionStatsDumper*);
ALWAYS_INLINE static void* bufferMalloc(size_t n, const char* typeName) {
return PartitionAllocGeneric(bufferPartition(), n, typeName);
}
ALWAYS_INLINE static void* bufferRealloc(void* p,
size_t n,
const char* typeName) {
return PartitionReallocGeneric(bufferPartition(), p, n, typeName);
}
ALWAYS_INLINE static void bufferFree(void* p) {
PartitionFreeGeneric(bufferPartition(), p);
}
ALWAYS_INLINE static size_t bufferActualSize(size_t n) {
return PartitionAllocActualSize(bufferPartition(), n);
}
static void* fastMalloc(size_t n, const char* typeName) {
return PartitionAllocGeneric(Partitions::fastMallocPartition(), n,
typeName);
}
static void* fastZeroedMalloc(size_t n, const char* typeName) {
void* result = fastMalloc(n, typeName);
memset(result, 0, n);
return result;
}
static void* fastRealloc(void* p, size_t n, const char* typeName) {
return PartitionReallocGeneric(Partitions::fastMallocPartition(), p, n,
typeName);
}
static void fastFree(void* p) {
PartitionFreeGeneric(Partitions::fastMallocPartition(), p);
}
static void handleOutOfMemory();
private:
static base::subtle::SpinLock s_initializationLock;
static bool s_initialized;
// We have the following four partitions.
// - LayoutObject partition: A partition to allocate LayoutObjects.
// We prepare a dedicated partition for LayoutObjects because they
// are likely to be a source of use-after-frees. Another reason
// is for performance: As LayoutObjects are guaranteed to only be used
// by the main thread, we can bypass acquiring a lock. Also we can
// improve memory locality by putting LayoutObjects together.
// - Buffer partition: A partition to allocate objects that have a strong
// risk where the length and/or the contents are exploited from user
// scripts. Vectors, HashTables, ArrayBufferContents and Strings are
// allocated in the buffer partition.
// - Fast malloc partition: A partition to allocate all other objects.
static base::PartitionAllocatorGeneric m_fastMallocAllocator;
static base::PartitionAllocatorGeneric m_bufferAllocator;
static base::SizeSpecificPartitionAllocator<1024> m_layoutAllocator;
static ReportPartitionAllocSizeFunction m_reportSizeFunction;
};
using base::kGenericMaxDirectMapped;
using base::kPageAllocationGranularity;
using base::kPageAllocationGranularityBaseMask;
using base::kPageAllocationGranularityOffsetMask;
using base::kSystemPageSize;
using base::AllocPages;
using base::DecommitSystemPages;
using base::DiscardSystemPages;
using base::PartitionFree;
using base::FreePages;
using base::GetAllocPageErrorCode;
using base::RecommitSystemPages;
using base::RoundDownToSystemPage;
using base::RoundUpToSystemPage;
using base::SetSystemPagesAccessible;
using base::SetSystemPagesInaccessible;
using base::PageAccessible;
using base::PageInaccessible;
using base::PartitionStatsDumper;
using base::PartitionMemoryStats;
using base::PartitionBucketMemoryStats;
using base::PartitionAllocHooks;
} // namespace WTF
#endif // Partitions_h
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