251 lines
7.2 KiB
C++
251 lines
7.2 KiB
C++
//=-- lsan_allocator.cc ---------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of LeakSanitizer.
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// See lsan_allocator.h for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lsan_allocator.h"
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#include "sanitizer_common/sanitizer_allocator.h"
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#include "sanitizer_common/sanitizer_allocator_interface.h"
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#include "sanitizer_common/sanitizer_internal_defs.h"
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#include "sanitizer_common/sanitizer_stackdepot.h"
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#include "sanitizer_common/sanitizer_stacktrace.h"
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#include "lsan_common.h"
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extern "C" void *memset(void *ptr, int value, uptr num);
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namespace __lsan {
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struct ChunkMetadata {
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bool allocated : 8; // Must be first.
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ChunkTag tag : 2;
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uptr requested_size : 54;
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u32 stack_trace_id;
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};
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#if defined(__mips64)
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static const uptr kMaxAllowedMallocSize = 4UL << 30;
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static const uptr kRegionSizeLog = 20;
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static const uptr kNumRegions = SANITIZER_MMAP_RANGE_SIZE >> kRegionSizeLog;
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typedef TwoLevelByteMap<(kNumRegions >> 12), 1 << 12> ByteMap;
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typedef CompactSizeClassMap SizeClassMap;
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typedef SizeClassAllocator32<0, SANITIZER_MMAP_RANGE_SIZE,
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sizeof(ChunkMetadata), SizeClassMap, kRegionSizeLog, ByteMap>
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PrimaryAllocator;
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#else
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static const uptr kMaxAllowedMallocSize = 8UL << 30;
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static const uptr kAllocatorSpace = 0x600000000000ULL;
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static const uptr kAllocatorSize = 0x40000000000ULL; // 4T.
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typedef SizeClassAllocator64<kAllocatorSpace, kAllocatorSize,
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sizeof(ChunkMetadata), DefaultSizeClassMap> PrimaryAllocator;
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#endif
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typedef SizeClassAllocatorLocalCache<PrimaryAllocator> AllocatorCache;
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typedef LargeMmapAllocator<> SecondaryAllocator;
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typedef CombinedAllocator<PrimaryAllocator, AllocatorCache,
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SecondaryAllocator> Allocator;
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static Allocator allocator;
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static THREADLOCAL AllocatorCache cache;
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void InitializeAllocator() {
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allocator.InitLinkerInitialized(common_flags()->allocator_may_return_null);
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}
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void AllocatorThreadFinish() {
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allocator.SwallowCache(&cache);
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}
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static ChunkMetadata *Metadata(const void *p) {
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return reinterpret_cast<ChunkMetadata *>(allocator.GetMetaData(p));
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}
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static void RegisterAllocation(const StackTrace &stack, void *p, uptr size) {
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if (!p) return;
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ChunkMetadata *m = Metadata(p);
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CHECK(m);
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m->tag = DisabledInThisThread() ? kIgnored : kDirectlyLeaked;
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m->stack_trace_id = StackDepotPut(stack);
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m->requested_size = size;
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atomic_store(reinterpret_cast<atomic_uint8_t *>(m), 1, memory_order_relaxed);
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}
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static void RegisterDeallocation(void *p) {
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if (!p) return;
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ChunkMetadata *m = Metadata(p);
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CHECK(m);
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atomic_store(reinterpret_cast<atomic_uint8_t *>(m), 0, memory_order_relaxed);
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}
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void *Allocate(const StackTrace &stack, uptr size, uptr alignment,
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bool cleared) {
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if (size == 0)
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size = 1;
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if (size > kMaxAllowedMallocSize) {
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Report("WARNING: LeakSanitizer failed to allocate %zu bytes\n", size);
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return 0;
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}
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void *p = allocator.Allocate(&cache, size, alignment, false);
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// Do not rely on the allocator to clear the memory (it's slow).
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if (cleared && allocator.FromPrimary(p))
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memset(p, 0, size);
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RegisterAllocation(stack, p, size);
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if (&__sanitizer_malloc_hook) __sanitizer_malloc_hook(p, size);
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return p;
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}
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void Deallocate(void *p) {
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if (&__sanitizer_free_hook) __sanitizer_free_hook(p);
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RegisterDeallocation(p);
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allocator.Deallocate(&cache, p);
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}
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void *Reallocate(const StackTrace &stack, void *p, uptr new_size,
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uptr alignment) {
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RegisterDeallocation(p);
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if (new_size > kMaxAllowedMallocSize) {
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Report("WARNING: LeakSanitizer failed to allocate %zu bytes\n", new_size);
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allocator.Deallocate(&cache, p);
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return 0;
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}
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p = allocator.Reallocate(&cache, p, new_size, alignment);
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RegisterAllocation(stack, p, new_size);
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return p;
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}
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void GetAllocatorCacheRange(uptr *begin, uptr *end) {
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*begin = (uptr)&cache;
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*end = *begin + sizeof(cache);
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}
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uptr GetMallocUsableSize(const void *p) {
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ChunkMetadata *m = Metadata(p);
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if (!m) return 0;
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return m->requested_size;
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}
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///// Interface to the common LSan module. /////
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void LockAllocator() {
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allocator.ForceLock();
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}
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void UnlockAllocator() {
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allocator.ForceUnlock();
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}
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void GetAllocatorGlobalRange(uptr *begin, uptr *end) {
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*begin = (uptr)&allocator;
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*end = *begin + sizeof(allocator);
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}
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uptr PointsIntoChunk(void* p) {
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uptr addr = reinterpret_cast<uptr>(p);
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uptr chunk = reinterpret_cast<uptr>(allocator.GetBlockBeginFastLocked(p));
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if (!chunk) return 0;
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// LargeMmapAllocator considers pointers to the meta-region of a chunk to be
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// valid, but we don't want that.
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if (addr < chunk) return 0;
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ChunkMetadata *m = Metadata(reinterpret_cast<void *>(chunk));
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CHECK(m);
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if (!m->allocated)
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return 0;
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if (addr < chunk + m->requested_size)
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return chunk;
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if (IsSpecialCaseOfOperatorNew0(chunk, m->requested_size, addr))
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return chunk;
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return 0;
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}
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uptr GetUserBegin(uptr chunk) {
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return chunk;
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}
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LsanMetadata::LsanMetadata(uptr chunk) {
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metadata_ = Metadata(reinterpret_cast<void *>(chunk));
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CHECK(metadata_);
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}
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bool LsanMetadata::allocated() const {
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return reinterpret_cast<ChunkMetadata *>(metadata_)->allocated;
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}
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ChunkTag LsanMetadata::tag() const {
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return reinterpret_cast<ChunkMetadata *>(metadata_)->tag;
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}
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void LsanMetadata::set_tag(ChunkTag value) {
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reinterpret_cast<ChunkMetadata *>(metadata_)->tag = value;
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}
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uptr LsanMetadata::requested_size() const {
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return reinterpret_cast<ChunkMetadata *>(metadata_)->requested_size;
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}
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u32 LsanMetadata::stack_trace_id() const {
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return reinterpret_cast<ChunkMetadata *>(metadata_)->stack_trace_id;
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}
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void ForEachChunk(ForEachChunkCallback callback, void *arg) {
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allocator.ForEachChunk(callback, arg);
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}
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IgnoreObjectResult IgnoreObjectLocked(const void *p) {
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void *chunk = allocator.GetBlockBegin(p);
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if (!chunk || p < chunk) return kIgnoreObjectInvalid;
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ChunkMetadata *m = Metadata(chunk);
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CHECK(m);
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if (m->allocated && (uptr)p < (uptr)chunk + m->requested_size) {
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if (m->tag == kIgnored)
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return kIgnoreObjectAlreadyIgnored;
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m->tag = kIgnored;
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return kIgnoreObjectSuccess;
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} else {
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return kIgnoreObjectInvalid;
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}
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}
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} // namespace __lsan
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using namespace __lsan;
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extern "C" {
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SANITIZER_INTERFACE_ATTRIBUTE
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uptr __sanitizer_get_current_allocated_bytes() {
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uptr stats[AllocatorStatCount];
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allocator.GetStats(stats);
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return stats[AllocatorStatAllocated];
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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uptr __sanitizer_get_heap_size() {
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uptr stats[AllocatorStatCount];
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allocator.GetStats(stats);
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return stats[AllocatorStatMapped];
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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uptr __sanitizer_get_free_bytes() { return 0; }
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SANITIZER_INTERFACE_ATTRIBUTE
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uptr __sanitizer_get_unmapped_bytes() { return 0; }
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SANITIZER_INTERFACE_ATTRIBUTE
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uptr __sanitizer_get_estimated_allocated_size(uptr size) { return size; }
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SANITIZER_INTERFACE_ATTRIBUTE
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int __sanitizer_get_ownership(const void *p) { return Metadata(p) != 0; }
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SANITIZER_INTERFACE_ATTRIBUTE
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uptr __sanitizer_get_allocated_size(const void *p) {
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return GetMallocUsableSize(p);
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}
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} // extern "C"
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