compiler-rt/lib/lsan/lsan_allocator.h

//=-- lsan_allocator.h ----------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of LeakSanitizer.
// Allocator for standalone LSan.
//
//===----------------------------------------------------------------------===//

#ifndef LSAN_ALLOCATOR_H
#define LSAN_ALLOCATOR_H

#include "sanitizer_common/sanitizer_allocator.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_internal_defs.h"
#include "lsan_common.h"

namespace __lsan {

void *Allocate(const StackTrace &stack, uptr size, uptr alignment,
               bool cleared);
void Deallocate(void *p);
void *Reallocate(const StackTrace &stack, void *p, uptr new_size,
                 uptr alignment);
uptr GetMallocUsableSize(const void *p);

template<typename Callable>
void ForEachChunk(const Callable &callback);

void GetAllocatorCacheRange(uptr *begin, uptr *end);
void AllocatorThreadFinish();
void InitializeAllocator();

const bool kAlwaysClearMemory = true;

struct ChunkMetadata {
  u8 allocated : 8;  // Must be first.
  ChunkTag tag : 2;
#if SANITIZER_WORDSIZE == 64
  uptr requested_size : 54;
#else
  uptr requested_size : 32;
  uptr padding : 22;
#endif
  u32 stack_trace_id;
};

#if defined(__mips64) || defined(__aarch64__) || defined(__i386__) || \
    defined(__arm__)
static const uptr kRegionSizeLog = 20;
static const uptr kNumRegions = SANITIZER_MMAP_RANGE_SIZE >> kRegionSizeLog;
typedef TwoLevelByteMap<(kNumRegions >> 12), 1 << 12> ByteMap;
typedef CompactSizeClassMap SizeClassMap;
typedef SizeClassAllocator32<0, SANITIZER_MMAP_RANGE_SIZE,
    sizeof(ChunkMetadata), SizeClassMap, kRegionSizeLog, ByteMap>
    PrimaryAllocator;
#elif defined(__x86_64__)
struct AP64 {  // Allocator64 parameters. Deliberately using a short name.
  static const uptr kSpaceBeg = 0x600000000000ULL;
  static const uptr kSpaceSize =  0x40000000000ULL; // 4T.
  static const uptr kMetadataSize = sizeof(ChunkMetadata);
  typedef DefaultSizeClassMap SizeClassMap;
  typedef NoOpMapUnmapCallback MapUnmapCallback;
  static const uptr kFlags = 0;
};

typedef SizeClassAllocator64<AP64> PrimaryAllocator;
#endif
typedef SizeClassAllocatorLocalCache<PrimaryAllocator> AllocatorCache;

AllocatorCache *GetAllocatorCache();

void *lsan_memalign(uptr alignment, uptr size, const StackTrace &stack);
void *lsan_malloc(uptr size, const StackTrace &stack);
void lsan_free(void *p);
void *lsan_realloc(void *p, uptr size, const StackTrace &stack);
void *lsan_calloc(uptr nmemb, uptr size, const StackTrace &stack);
void *lsan_valloc(uptr size, const StackTrace &stack);
uptr lsan_mz_size(const void *p);

}  // namespace __lsan

#endif  // LSAN_ALLOCATOR_H