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(
83 common_flags()->allocator_may_return_null,
84 common_flags()->allocator_release_to_os_interval_ms);
87 void AllocatorThreadFinish() {
88 allocator.SwallowCache(&cache);
91 static ChunkMetadata *Metadata(const void *p) {
92 return reinterpret_cast<ChunkMetadata *>(allocator.GetMetaData(p));
95 static void RegisterAllocation(const StackTrace &stack, void *p, uptr size) {
97 ChunkMetadata *m = Metadata(p);
99 m->tag = DisabledInThisThread() ? kIgnored : kDirectlyLeaked;
100 m->stack_trace_id = StackDepotPut(stack);
101 m->requested_size = size;
102 atomic_store(reinterpret_cast<atomic_uint8_t *>(m), 1, memory_order_relaxed);
105 static void RegisterDeallocation(void *p) {
107 ChunkMetadata *m = Metadata(p);
109 atomic_store(reinterpret_cast<atomic_uint8_t *>(m), 0, memory_order_relaxed);
112 void *Allocate(const StackTrace &stack, uptr size, uptr alignment,
116 if (size > kMaxAllowedMallocSize) {
117 Report("WARNING: LeakSanitizer failed to allocate %zu bytes\n", size);
120 void *p = allocator.Allocate(&cache, size, alignment, false);
121 // Do not rely on the allocator to clear the memory (it's slow).
122 if (cleared && allocator.FromPrimary(p))
124 RegisterAllocation(stack, p, size);
125 if (&__sanitizer_malloc_hook) __sanitizer_malloc_hook(p, size);
126 RunMallocHooks(p, size);
130 void Deallocate(void *p) {
131 if (&__sanitizer_free_hook) __sanitizer_free_hook(p);
133 RegisterDeallocation(p);
134 allocator.Deallocate(&cache, p);
137 void *Reallocate(const StackTrace &stack, void *p, uptr new_size,
139 RegisterDeallocation(p);
140 if (new_size > kMaxAllowedMallocSize) {
141 Report("WARNING: LeakSanitizer failed to allocate %zu bytes\n", new_size);
142 allocator.Deallocate(&cache, p);
145 p = allocator.Reallocate(&cache, p, new_size, alignment);
146 RegisterAllocation(stack, p, new_size);
150 void GetAllocatorCacheRange(uptr *begin, uptr *end) {
151 *begin = (uptr)&cache;
152 *end = *begin + sizeof(cache);
155 uptr GetMallocUsableSize(const void *p) {
156 ChunkMetadata *m = Metadata(p);
158 return m->requested_size;
161 ///// Interface to the common LSan module. /////
163 void LockAllocator() {
164 allocator.ForceLock();
167 void UnlockAllocator() {
168 allocator.ForceUnlock();
171 void GetAllocatorGlobalRange(uptr *begin, uptr *end) {
172 *begin = (uptr)&allocator;
173 *end = *begin + sizeof(allocator);
176 uptr PointsIntoChunk(void* p) {
177 uptr addr = reinterpret_cast<uptr>(p);
178 uptr chunk = reinterpret_cast<uptr>(allocator.GetBlockBeginFastLocked(p));
179 if (!chunk) return 0;
180 // LargeMmapAllocator considers pointers to the meta-region of a chunk to be
181 // valid, but we don't want that.
182 if (addr < chunk) return 0;
183 ChunkMetadata *m = Metadata(reinterpret_cast<void *>(chunk));
185 if (!allocator.PointsIntoChunk(p))
187 if (m->allocated != 1)
189 if (addr < chunk + m->requested_size)
191 if (IsSpecialCaseOfOperatorNew0(chunk, m->requested_size, addr))
196 uptr GetUserBegin(uptr chunk) {
200 LsanMetadata::LsanMetadata(uptr chunk) {
201 metadata_ = Metadata(reinterpret_cast<void *>(chunk));
205 bool LsanMetadata::allocated() const {
206 return reinterpret_cast<ChunkMetadata *>(metadata_)->allocated;
209 ChunkTag LsanMetadata::tag() const {
210 return reinterpret_cast<ChunkMetadata *>(metadata_)->tag;
213 void LsanMetadata::set_tag(ChunkTag value) {
214 reinterpret_cast<ChunkMetadata *>(metadata_)->tag = value;
217 uptr LsanMetadata::requested_size() const {
218 return reinterpret_cast<ChunkMetadata *>(metadata_)->requested_size;
221 u32 LsanMetadata::stack_trace_id() const {
222 return reinterpret_cast<ChunkMetadata *>(metadata_)->stack_trace_id;
225 void ForEachChunk(ForEachChunkCallback callback, void *arg) {
226 allocator.ForEachChunk(callback, arg);
229 IgnoreObjectResult IgnoreObjectLocked(const void *p) {
230 void *chunk = allocator.GetBlockBegin(p);
231 if (!chunk || p < chunk) return kIgnoreObjectInvalid;
232 ChunkMetadata *m = Metadata(chunk);
234 if (m->allocated && (uptr)p < (uptr)chunk + m->requested_size) {
235 if (m->tag == kIgnored)
236 return kIgnoreObjectAlreadyIgnored;
238 return kIgnoreObjectSuccess;
240 return kIgnoreObjectInvalid;
243 } // namespace __lsan
245 using namespace __lsan;
248 SANITIZER_INTERFACE_ATTRIBUTE
249 uptr __sanitizer_get_current_allocated_bytes() {
250 uptr stats[AllocatorStatCount];
251 allocator.GetStats(stats);
252 return stats[AllocatorStatAllocated];
255 SANITIZER_INTERFACE_ATTRIBUTE
256 uptr __sanitizer_get_heap_size() {
257 uptr stats[AllocatorStatCount];
258 allocator.GetStats(stats);
259 return stats[AllocatorStatMapped];
262 SANITIZER_INTERFACE_ATTRIBUTE
263 uptr __sanitizer_get_free_bytes() { return 0; }
265 SANITIZER_INTERFACE_ATTRIBUTE
266 uptr __sanitizer_get_unmapped_bytes() { return 0; }
268 SANITIZER_INTERFACE_ATTRIBUTE
269 uptr __sanitizer_get_estimated_allocated_size(uptr size) { return size; }
271 SANITIZER_INTERFACE_ATTRIBUTE
272 int __sanitizer_get_ownership(const void *p) { return Metadata(p) != nullptr; }
274 SANITIZER_INTERFACE_ATTRIBUTE
275 uptr __sanitizer_get_allocated_size(const void *p) {
276 return GetMallocUsableSize(p);