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