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126 lines
4.5 KiB
126 lines
4.5 KiB
//===-- scudo_allocator.h ---------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// Header for scudo_allocator.cpp.
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///
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//===----------------------------------------------------------------------===//
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#ifndef SCUDO_ALLOCATOR_H_
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#define SCUDO_ALLOCATOR_H_
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#include "scudo_platform.h"
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namespace __scudo {
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enum AllocType : u8 {
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FromMalloc = 0, // Memory block came from malloc, realloc, calloc, etc.
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FromNew = 1, // Memory block came from operator new.
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FromNewArray = 2, // Memory block came from operator new [].
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FromMemalign = 3, // Memory block came from memalign, posix_memalign, etc.
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};
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enum ChunkState : u8 {
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ChunkAvailable = 0,
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ChunkAllocated = 1,
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ChunkQuarantine = 2
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};
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// Our header requires 64 bits of storage. Having the offset saves us from
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// using functions such as GetBlockBegin, that is fairly costly. Our first
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// implementation used the MetaData as well, which offers the advantage of
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// being stored away from the chunk itself, but accessing it was costly as
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// well. The header will be atomically loaded and stored.
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typedef u64 PackedHeader;
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struct UnpackedHeader {
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u64 Checksum : 16;
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u64 ClassId : 8;
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u64 SizeOrUnusedBytes : 20; // Size for Primary backed allocations, amount of
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// unused bytes in the chunk for Secondary ones.
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u64 State : 2; // available, allocated, or quarantined
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u64 AllocType : 2; // malloc, new, new[], or memalign
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u64 Offset : 16; // Offset from the beginning of the backend
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// allocation to the beginning of the chunk
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// itself, in multiples of MinAlignment. See
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// comment about its maximum value and in init().
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};
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typedef atomic_uint64_t AtomicPackedHeader;
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COMPILER_CHECK(sizeof(UnpackedHeader) == sizeof(PackedHeader));
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// Minimum alignment of 8 bytes for 32-bit, 16 for 64-bit
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const uptr MinAlignmentLog = FIRST_32_SECOND_64(3, 4);
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const uptr MaxAlignmentLog = 24; // 16 MB
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const uptr MinAlignment = 1 << MinAlignmentLog;
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const uptr MaxAlignment = 1 << MaxAlignmentLog;
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// constexpr version of __sanitizer::RoundUp without the extraneous CHECK.
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// This way we can use it in constexpr variables and functions declarations.
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constexpr uptr RoundUpTo(uptr Size, uptr Boundary) {
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return (Size + Boundary - 1) & ~(Boundary - 1);
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}
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namespace Chunk {
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constexpr uptr getHeaderSize() {
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return RoundUpTo(sizeof(PackedHeader), MinAlignment);
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}
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}
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#if SANITIZER_CAN_USE_ALLOCATOR64
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const uptr AllocatorSpace = ~0ULL;
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struct AP64 {
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static const uptr kSpaceBeg = AllocatorSpace;
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static const uptr kSpaceSize = AllocatorSize;
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static const uptr kMetadataSize = 0;
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typedef __scudo::SizeClassMap SizeClassMap;
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typedef NoOpMapUnmapCallback MapUnmapCallback;
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static const uptr kFlags =
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SizeClassAllocator64FlagMasks::kRandomShuffleChunks;
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using AddressSpaceView = LocalAddressSpaceView;
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};
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typedef SizeClassAllocator64<AP64> PrimaryT;
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#else
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struct AP32 {
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static const uptr kSpaceBeg = 0;
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static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
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static const uptr kMetadataSize = 0;
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typedef __scudo::SizeClassMap SizeClassMap;
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static const uptr kRegionSizeLog = RegionSizeLog;
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using AddressSpaceView = LocalAddressSpaceView;
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typedef NoOpMapUnmapCallback MapUnmapCallback;
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static const uptr kFlags =
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SizeClassAllocator32FlagMasks::kRandomShuffleChunks |
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SizeClassAllocator32FlagMasks::kUseSeparateSizeClassForBatch;
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};
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typedef SizeClassAllocator32<AP32> PrimaryT;
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#endif // SANITIZER_CAN_USE_ALLOCATOR64
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#include "scudo_allocator_secondary.h"
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typedef LargeMmapAllocator SecondaryT;
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#include "scudo_allocator_combined.h"
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typedef CombinedAllocator BackendT;
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typedef CombinedAllocator::AllocatorCache AllocatorCacheT;
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void initScudo();
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void *scudoAllocate(uptr Size, uptr Alignment, AllocType Type);
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void scudoDeallocate(void *Ptr, uptr Size, uptr Alignment, AllocType Type);
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void *scudoRealloc(void *Ptr, uptr Size);
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void *scudoCalloc(uptr NMemB, uptr Size);
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void *scudoValloc(uptr Size);
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void *scudoPvalloc(uptr Size);
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int scudoPosixMemalign(void **MemPtr, uptr Alignment, uptr Size);
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void *scudoAlignedAlloc(uptr Alignment, uptr Size);
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uptr scudoMallocUsableSize(void *Ptr);
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} // namespace __scudo
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#endif // SCUDO_ALLOCATOR_H_
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