| //===-- sanitizer_allocator_combined.h --------------------------*- C++ -*-===// |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Part of the Sanitizer Allocator. |
| // |
| //===----------------------------------------------------------------------===// |
| #ifndef SANITIZER_ALLOCATOR_H |
| #error This file must be included inside sanitizer_allocator.h |
| #endif |
| |
| // This class implements a complete memory allocator by using two |
| // internal allocators: |
| // PrimaryAllocator is efficient, but may not allocate some sizes (alignments). |
| // When allocating 2^x bytes it should return 2^x aligned chunk. |
| // PrimaryAllocator is used via a local AllocatorCache. |
| // SecondaryAllocator can allocate anything, but is not efficient. |
| template <class PrimaryAllocator, class AllocatorCache, |
| class SecondaryAllocator> // NOLINT |
| class CombinedAllocator { |
| public: |
| typedef typename SecondaryAllocator::FailureHandler FailureHandler; |
| |
| void InitLinkerInitialized(s32 release_to_os_interval_ms) { |
| primary_.Init(release_to_os_interval_ms); |
| secondary_.InitLinkerInitialized(); |
| stats_.InitLinkerInitialized(); |
| } |
| |
| void Init(s32 release_to_os_interval_ms) { |
| primary_.Init(release_to_os_interval_ms); |
| secondary_.Init(); |
| stats_.Init(); |
| } |
| |
| void *Allocate(AllocatorCache *cache, uptr size, uptr alignment) { |
| // Returning 0 on malloc(0) may break a lot of code. |
| if (size == 0) |
| size = 1; |
| if (size + alignment < size) |
| return FailureHandler::OnBadRequest(); |
| uptr original_size = size; |
| // If alignment requirements are to be fulfilled by the frontend allocator |
| // rather than by the primary or secondary, passing an alignment lower than |
| // or equal to 8 will prevent any further rounding up, as well as the later |
| // alignment check. |
| if (alignment > 8) |
| size = RoundUpTo(size, alignment); |
| // The primary allocator should return a 2^x aligned allocation when |
| // requested 2^x bytes, hence using the rounded up 'size' when being |
| // serviced by the primary (this is no longer true when the primary is |
| // using a non-fixed base address). The secondary takes care of the |
| // alignment without such requirement, and allocating 'size' would use |
| // extraneous memory, so we employ 'original_size'. |
| void *res; |
| if (primary_.CanAllocate(size, alignment)) |
| res = cache->Allocate(&primary_, primary_.ClassID(size)); |
| else |
| res = secondary_.Allocate(&stats_, original_size, alignment); |
| if (!res) |
| return FailureHandler::OnOOM(); |
| if (alignment > 8) |
| CHECK_EQ(reinterpret_cast<uptr>(res) & (alignment - 1), 0); |
| return res; |
| } |
| |
| s32 ReleaseToOSIntervalMs() const { |
| return primary_.ReleaseToOSIntervalMs(); |
| } |
| |
| void SetReleaseToOSIntervalMs(s32 release_to_os_interval_ms) { |
| primary_.SetReleaseToOSIntervalMs(release_to_os_interval_ms); |
| } |
| |
| void Deallocate(AllocatorCache *cache, void *p) { |
| if (!p) return; |
| if (primary_.PointerIsMine(p)) |
| cache->Deallocate(&primary_, primary_.GetSizeClass(p), p); |
| else |
| secondary_.Deallocate(&stats_, p); |
| } |
| |
| void *Reallocate(AllocatorCache *cache, void *p, uptr new_size, |
| uptr alignment) { |
| if (!p) |
| return Allocate(cache, new_size, alignment); |
| if (!new_size) { |
| Deallocate(cache, p); |
| return nullptr; |
| } |
| CHECK(PointerIsMine(p)); |
| uptr old_size = GetActuallyAllocatedSize(p); |
| uptr memcpy_size = Min(new_size, old_size); |
| void *new_p = Allocate(cache, new_size, alignment); |
| if (new_p) |
| internal_memcpy(new_p, p, memcpy_size); |
| Deallocate(cache, p); |
| return new_p; |
| } |
| |
| bool PointerIsMine(void *p) { |
| if (primary_.PointerIsMine(p)) |
| return true; |
| return secondary_.PointerIsMine(p); |
| } |
| |
| bool FromPrimary(void *p) { |
| return primary_.PointerIsMine(p); |
| } |
| |
| void *GetMetaData(const void *p) { |
| if (primary_.PointerIsMine(p)) |
| return primary_.GetMetaData(p); |
| return secondary_.GetMetaData(p); |
| } |
| |
| void *GetBlockBegin(const void *p) { |
| if (primary_.PointerIsMine(p)) |
| return primary_.GetBlockBegin(p); |
| return secondary_.GetBlockBegin(p); |
| } |
| |
| // This function does the same as GetBlockBegin, but is much faster. |
| // Must be called with the allocator locked. |
| void *GetBlockBeginFastLocked(void *p) { |
| if (primary_.PointerIsMine(p)) |
| return primary_.GetBlockBegin(p); |
| return secondary_.GetBlockBeginFastLocked(p); |
| } |
| |
| uptr GetActuallyAllocatedSize(void *p) { |
| if (primary_.PointerIsMine(p)) |
| return primary_.GetActuallyAllocatedSize(p); |
| return secondary_.GetActuallyAllocatedSize(p); |
| } |
| |
| uptr TotalMemoryUsed() { |
| return primary_.TotalMemoryUsed() + secondary_.TotalMemoryUsed(); |
| } |
| |
| void TestOnlyUnmap() { primary_.TestOnlyUnmap(); } |
| |
| void InitCache(AllocatorCache *cache) { |
| cache->Init(&stats_); |
| } |
| |
| void DestroyCache(AllocatorCache *cache) { |
| cache->Destroy(&primary_, &stats_); |
| } |
| |
| void SwallowCache(AllocatorCache *cache) { |
| cache->Drain(&primary_); |
| } |
| |
| void GetStats(AllocatorStatCounters s) const { |
| stats_.Get(s); |
| } |
| |
| void PrintStats() { |
| primary_.PrintStats(); |
| secondary_.PrintStats(); |
| } |
| |
| // ForceLock() and ForceUnlock() are needed to implement Darwin malloc zone |
| // introspection API. |
| void ForceLock() { |
| primary_.ForceLock(); |
| secondary_.ForceLock(); |
| } |
| |
| void ForceUnlock() { |
| secondary_.ForceUnlock(); |
| primary_.ForceUnlock(); |
| } |
| |
| // Iterate over all existing chunks. |
| // The allocator must be locked when calling this function. |
| void ForEachChunk(ForEachChunkCallback callback, void *arg) { |
| primary_.ForEachChunk(callback, arg); |
| secondary_.ForEachChunk(callback, arg); |
| } |
| |
| private: |
| PrimaryAllocator primary_; |
| SecondaryAllocator secondary_; |
| AllocatorGlobalStats stats_; |
| }; |