1 //=-- lsan_allocator.cc ---------------------------------------------------===//
3 // This file is distributed under the University of Illinois Open Source
4 // License. See LICENSE.TXT for details.
6 //===----------------------------------------------------------------------===//
8 // This file is a part of LeakSanitizer.
9 // See lsan_allocator.h for details.
11 //===----------------------------------------------------------------------===//
13 #include "lsan_allocator.h"
15 #include "sanitizer_common/sanitizer_allocator.h"
16 #include "sanitizer_common/sanitizer_allocator_interface.h"
17 #include "sanitizer_common/sanitizer_internal_defs.h"
18 #include "sanitizer_common/sanitizer_stackdepot.h"
19 #include "sanitizer_common/sanitizer_stacktrace.h"
20 #include "lsan_common.h"
22 extern "C" void *memset(void *ptr, int value, uptr num);
26 struct ChunkMetadata {
27 u8 allocated : 8; // Must be first.
29 #if SANITIZER_WORDSIZE == 64
30 uptr requested_size : 54;
32 uptr requested_size : 32;
38 #if SANITIZER_WORDSIZE == 64
39 #if defined(__mips64) || defined(__aarch64__)
40 static const uptr kMaxAllowedMallocSize = 4UL << 30;
41 static const uptr kRegionSizeLog = 20;
42 static const uptr kNumRegions = SANITIZER_MMAP_RANGE_SIZE >> kRegionSizeLog;
43 typedef TwoLevelByteMap<(kNumRegions >> 12), 1 << 12> ByteMap;
44 typedef CompactSizeClassMap SizeClassMap;
45 typedef SizeClassAllocator32<0, SANITIZER_MMAP_RANGE_SIZE,
46 sizeof(ChunkMetadata), SizeClassMap, kRegionSizeLog, ByteMap>
49 static const uptr kMaxAllowedMallocSize = 8UL << 30;
51 struct AP64 { // Allocator64 parameters. Deliberately using a short name.
52 static const uptr kSpaceBeg = 0x600000000000ULL;
53 static const uptr kSpaceSize = 0x40000000000ULL; // 4T.
54 static const uptr kMetadataSize = sizeof(ChunkMetadata);
55 typedef DefaultSizeClassMap SizeClassMap;
56 typedef NoOpMapUnmapCallback MapUnmapCallback;
57 static const uptr kFlags = 0;
60 typedef SizeClassAllocator64<AP64> PrimaryAllocator;
62 #else // SANITIZER_WORDSIZE == 32
63 typedef VeryCompactSizeClassMap SizeClassMap;
64 static const uptr kRegionSizeLog = 17;
65 static const uptr kNumRegions = SANITIZER_MMAP_RANGE_SIZE >> kRegionSizeLog;
66 typedef FlatByteMap<kNumRegions> ByteMap;
67 typedef SizeClassAllocator32<0, SANITIZER_MMAP_RANGE_SIZE,
68 sizeof(ChunkMetadata), SizeClassMap, kRegionSizeLog, ByteMap>
70 static const uptr kMaxAllowedMallocSize = 1UL << 30;
73 typedef SizeClassAllocatorLocalCache<PrimaryAllocator> AllocatorCache;
74 typedef LargeMmapAllocator<> SecondaryAllocator;
75 typedef CombinedAllocator<PrimaryAllocator, AllocatorCache,
76 SecondaryAllocator> Allocator;
78 static Allocator allocator;
79 static THREADLOCAL AllocatorCache cache;
81 void InitializeAllocator() {
82 allocator.InitLinkerInitialized(common_flags()->allocator_may_return_null);
85 void AllocatorThreadFinish() {
86 allocator.SwallowCache(&cache);
89 static ChunkMetadata *Metadata(const void *p) {
90 return reinterpret_cast<ChunkMetadata *>(allocator.GetMetaData(p));
93 static void RegisterAllocation(const StackTrace &stack, void *p, uptr size) {
95 ChunkMetadata *m = Metadata(p);
97 m->tag = DisabledInThisThread() ? kIgnored : kDirectlyLeaked;
98 m->stack_trace_id = StackDepotPut(stack);
99 m->requested_size = size;
100 atomic_store(reinterpret_cast<atomic_uint8_t *>(m), 1, memory_order_relaxed);
103 static void RegisterDeallocation(void *p) {
105 ChunkMetadata *m = Metadata(p);
107 atomic_store(reinterpret_cast<atomic_uint8_t *>(m), 0, memory_order_relaxed);
110 void *Allocate(const StackTrace &stack, uptr size, uptr alignment,
114 if (size > kMaxAllowedMallocSize) {
115 Report("WARNING: LeakSanitizer failed to allocate %zu bytes\n", size);
118 void *p = allocator.Allocate(&cache, size, alignment, false);
119 // Do not rely on the allocator to clear the memory (it's slow).
120 if (cleared && allocator.FromPrimary(p))
122 RegisterAllocation(stack, p, size);
123 if (&__sanitizer_malloc_hook) __sanitizer_malloc_hook(p, size);
124 RunMallocHooks(p, size);
128 void Deallocate(void *p) {
129 if (&__sanitizer_free_hook) __sanitizer_free_hook(p);
131 RegisterDeallocation(p);
132 allocator.Deallocate(&cache, p);
135 void *Reallocate(const StackTrace &stack, void *p, uptr new_size,
137 RegisterDeallocation(p);
138 if (new_size > kMaxAllowedMallocSize) {
139 Report("WARNING: LeakSanitizer failed to allocate %zu bytes\n", new_size);
140 allocator.Deallocate(&cache, p);
143 p = allocator.Reallocate(&cache, p, new_size, alignment);
144 RegisterAllocation(stack, p, new_size);
148 void GetAllocatorCacheRange(uptr *begin, uptr *end) {
149 *begin = (uptr)&cache;
150 *end = *begin + sizeof(cache);
153 uptr GetMallocUsableSize(const void *p) {
154 ChunkMetadata *m = Metadata(p);
156 return m->requested_size;
159 ///// Interface to the common LSan module. /////
161 void LockAllocator() {
162 allocator.ForceLock();
165 void UnlockAllocator() {
166 allocator.ForceUnlock();
169 void GetAllocatorGlobalRange(uptr *begin, uptr *end) {
170 *begin = (uptr)&allocator;
171 *end = *begin + sizeof(allocator);
174 uptr PointsIntoChunk(void* p) {
175 uptr addr = reinterpret_cast<uptr>(p);
176 uptr chunk = reinterpret_cast<uptr>(allocator.GetBlockBeginFastLocked(p));
177 if (!chunk) return 0;
178 // LargeMmapAllocator considers pointers to the meta-region of a chunk to be
179 // valid, but we don't want that.
180 if (addr < chunk) return 0;
181 ChunkMetadata *m = Metadata(reinterpret_cast<void *>(chunk));
183 if (!allocator.PointsIntoChunk(p))
185 if (m->allocated != 1)
187 if (addr < chunk + m->requested_size)
189 if (IsSpecialCaseOfOperatorNew0(chunk, m->requested_size, addr))
194 uptr GetUserBegin(uptr chunk) {
198 LsanMetadata::LsanMetadata(uptr chunk) {
199 metadata_ = Metadata(reinterpret_cast<void *>(chunk));
203 bool LsanMetadata::allocated() const {
204 return reinterpret_cast<ChunkMetadata *>(metadata_)->allocated;
207 ChunkTag LsanMetadata::tag() const {
208 return reinterpret_cast<ChunkMetadata *>(metadata_)->tag;
211 void LsanMetadata::set_tag(ChunkTag value) {
212 reinterpret_cast<ChunkMetadata *>(metadata_)->tag = value;
215 uptr LsanMetadata::requested_size() const {
216 return reinterpret_cast<ChunkMetadata *>(metadata_)->requested_size;
219 u32 LsanMetadata::stack_trace_id() const {
220 return reinterpret_cast<ChunkMetadata *>(metadata_)->stack_trace_id;
223 void ForEachChunk(ForEachChunkCallback callback, void *arg) {
224 allocator.ForEachChunk(callback, arg);
227 IgnoreObjectResult IgnoreObjectLocked(const void *p) {
228 void *chunk = allocator.GetBlockBegin(p);
229 if (!chunk || p < chunk) return kIgnoreObjectInvalid;
230 ChunkMetadata *m = Metadata(chunk);
232 if (m->allocated && (uptr)p < (uptr)chunk + m->requested_size) {
233 if (m->tag == kIgnored)
234 return kIgnoreObjectAlreadyIgnored;
236 return kIgnoreObjectSuccess;
238 return kIgnoreObjectInvalid;
241 } // namespace __lsan
243 using namespace __lsan;
246 SANITIZER_INTERFACE_ATTRIBUTE
247 uptr __sanitizer_get_current_allocated_bytes() {
248 uptr stats[AllocatorStatCount];
249 allocator.GetStats(stats);
250 return stats[AllocatorStatAllocated];
253 SANITIZER_INTERFACE_ATTRIBUTE
254 uptr __sanitizer_get_heap_size() {
255 uptr stats[AllocatorStatCount];
256 allocator.GetStats(stats);
257 return stats[AllocatorStatMapped];
260 SANITIZER_INTERFACE_ATTRIBUTE
261 uptr __sanitizer_get_free_bytes() { return 0; }
263 SANITIZER_INTERFACE_ATTRIBUTE
264 uptr __sanitizer_get_unmapped_bytes() { return 0; }
266 SANITIZER_INTERFACE_ATTRIBUTE
267 uptr __sanitizer_get_estimated_allocated_size(uptr size) { return size; }
269 SANITIZER_INTERFACE_ATTRIBUTE
270 int __sanitizer_get_ownership(const void *p) { return Metadata(p) != nullptr; }
272 SANITIZER_INTERFACE_ATTRIBUTE
273 uptr __sanitizer_get_allocated_size(const void *p) {
274 return GetMallocUsableSize(p);