Bug Summary

File:projects/compiler-rt/lib/lsan/lsan_common.cc
Warning:line 613, column 3
Called C++ object pointer is null

Annotated Source Code

1//=-- lsan_common.cc ------------------------------------------------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file is a part of LeakSanitizer.
11// Implementation of common leak checking functionality.
12//
13//===----------------------------------------------------------------------===//
14
15#include "lsan_common.h"
16
17#include "sanitizer_common/sanitizer_common.h"
18#include "sanitizer_common/sanitizer_flags.h"
19#include "sanitizer_common/sanitizer_flag_parser.h"
20#include "sanitizer_common/sanitizer_placement_new.h"
21#include "sanitizer_common/sanitizer_procmaps.h"
22#include "sanitizer_common/sanitizer_stackdepot.h"
23#include "sanitizer_common/sanitizer_stacktrace.h"
24#include "sanitizer_common/sanitizer_suppressions.h"
25#include "sanitizer_common/sanitizer_report_decorator.h"
26#include "sanitizer_common/sanitizer_tls_get_addr.h"
27
28#if CAN_SANITIZE_LEAKS1
29namespace __lsan {
30
31// This mutex is used to prevent races between DoLeakCheck and IgnoreObject, and
32// also to protect the global list of root regions.
33BlockingMutex global_mutex(LINKER_INITIALIZED);
34
35Flags lsan_flags;
36
37void DisableCounterUnderflow() {
38 if (common_flags()->detect_leaks) {
39 Report("Unmatched call to __lsan_enable().\n");
40 Die();
41 }
42}
43
44void Flags::SetDefaults() {
45#define LSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
46#include "lsan_flags.inc"
47#undef LSAN_FLAG
48}
49
50void RegisterLsanFlags(FlagParser *parser, Flags *f) {
51#define LSAN_FLAG(Type, Name, DefaultValue, Description) \
52 RegisterFlag(parser, #Name, Description, &f->Name);
53#include "lsan_flags.inc"
54#undef LSAN_FLAG
55}
56
57#define LOG_POINTERS(...)do { if (flags()->log_pointers) Report(...); } while (0); \
58 do { \
59 if (flags()->log_pointers) Report(__VA_ARGS__); \
60 } while (0);
61
62#define LOG_THREADS(...)do { if (flags()->log_threads) Report(...); } while (0); \
63 do { \
64 if (flags()->log_threads) Report(__VA_ARGS__); \
65 } while (0);
66
67ALIGNED(64)__attribute__((aligned(64))) static char suppression_placeholder[sizeof(SuppressionContext)];
68static SuppressionContext *suppression_ctx = nullptr;
69static const char kSuppressionLeak[] = "leak";
70static const char *kSuppressionTypes[] = { kSuppressionLeak };
71static const char kStdSuppressions[] =
72#if SANITIZER_SUPPRESS_LEAK_ON_PTHREAD_EXIT0
73 // For more details refer to the SANITIZER_SUPPRESS_LEAK_ON_PTHREAD_EXIT
74 // definition.
75 "leak:*pthread_exit*\n"
76#endif // SANITIZER_SUPPRESS_LEAK_ON_PTHREAD_EXIT
77 // TLS leak in some glibc versions, described in
78 // https://sourceware.org/bugzilla/show_bug.cgi?id=12650.
79 "leak:*tls_get_addr*\n";
80
81void InitializeSuppressions() {
82 CHECK_EQ(nullptr, suppression_ctx)do { __sanitizer::u64 v1 = (u64)((nullptr)); __sanitizer::u64
v2 = (u64)((suppression_ctx)); if (__builtin_expect(!!(!(v1 ==
v2)), 0)) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 82, "(" "(nullptr)" ") " "==" " (" "(suppression_ctx)" ")",
v1, v2); } while (false)
;
83 suppression_ctx = new (suppression_placeholder) // NOLINT
84 SuppressionContext(kSuppressionTypes, ARRAY_SIZE(kSuppressionTypes)(sizeof(kSuppressionTypes)/sizeof((kSuppressionTypes)[0])));
85 suppression_ctx->ParseFromFile(flags()->suppressions);
86 if (&__lsan_default_suppressions)
87 suppression_ctx->Parse(__lsan_default_suppressions());
88 suppression_ctx->Parse(kStdSuppressions);
89}
90
91static SuppressionContext *GetSuppressionContext() {
92 CHECK(suppression_ctx)do { __sanitizer::u64 v1 = (u64)((suppression_ctx)); __sanitizer
::u64 v2 = (u64)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)
) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 92, "(" "(suppression_ctx)" ") " "!=" " (" "0" ")", v1, v2)
; } while (false)
;
93 return suppression_ctx;
94}
95
96static InternalMmapVector<RootRegion> *root_regions;
97
98InternalMmapVector<RootRegion> const *GetRootRegions() { return root_regions; }
99
100void InitializeRootRegions() {
101 CHECK(!root_regions)do { __sanitizer::u64 v1 = (u64)((!root_regions)); __sanitizer
::u64 v2 = (u64)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)
) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 101, "(" "(!root_regions)" ") " "!=" " (" "0" ")", v1, v2);
} while (false)
;
102 ALIGNED(64)__attribute__((aligned(64))) static char placeholder[sizeof(InternalMmapVector<RootRegion>)];
103 root_regions = new(placeholder) InternalMmapVector<RootRegion>(1);
104}
105
106void InitCommonLsan() {
107 InitializeRootRegions();
108 if (common_flags()->detect_leaks) {
109 // Initialization which can fail or print warnings should only be done if
110 // LSan is actually enabled.
111 InitializeSuppressions();
112 InitializePlatformSpecificModules();
113 }
114}
115
116class Decorator: public __sanitizer::SanitizerCommonDecorator {
117 public:
118 Decorator() : SanitizerCommonDecorator() { }
119 const char *Error() { return Red(); }
120 const char *Leak() { return Blue(); }
121 const char *End() { return Default(); }
122};
123
124static inline bool CanBeAHeapPointer(uptr p) {
125 // Since our heap is located in mmap-ed memory, we can assume a sensible lower
126 // bound on heap addresses.
127 const uptr kMinAddress = 4 * 4096;
128 if (p < kMinAddress) return false;
129#if defined(__x86_64__)
130 // Accept only canonical form user-space addresses.
131 return ((p >> 47) == 0);
132#elif defined(__mips64)
133 return ((p >> 40) == 0);
134#elif defined(__aarch64__)
135 unsigned runtimeVMA =
136 (MostSignificantSetBitIndex(GET_CURRENT_FRAME()(__sanitizer::uptr) __builtin_frame_address(0)) + 1);
137 return ((p >> runtimeVMA) == 0);
138#else
139 return true;
140#endif
141}
142
143// Scans the memory range, looking for byte patterns that point into allocator
144// chunks. Marks those chunks with |tag| and adds them to |frontier|.
145// There are two usage modes for this function: finding reachable chunks
146// (|tag| = kReachable) and finding indirectly leaked chunks
147// (|tag| = kIndirectlyLeaked). In the second case, there's no flood fill,
148// so |frontier| = 0.
149void ScanRangeForPointers(uptr begin, uptr end,
150 Frontier *frontier,
151 const char *region_type, ChunkTag tag) {
152 CHECK(tag == kReachable || tag == kIndirectlyLeaked)do { __sanitizer::u64 v1 = (u64)((tag == kReachable || tag ==
kIndirectlyLeaked)); __sanitizer::u64 v2 = (u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 152, "(" "(tag == kReachable || tag == kIndirectlyLeaked)" ") "
"!=" " (" "0" ")", v1, v2); } while (false)
;
153 const uptr alignment = flags()->pointer_alignment();
154 LOG_POINTERS("Scanning %s range %p-%p.\n", region_type, begin, end)do { if (flags()->log_pointers) Report("Scanning %s range %p-%p.\n"
, region_type, begin, end); } while (0);
;
155 uptr pp = begin;
156 if (pp % alignment)
157 pp = pp + alignment - pp % alignment;
158 for (; pp + sizeof(void *) <= end; pp += alignment) { // NOLINT
159 void *p = *reinterpret_cast<void **>(pp);
160 if (!CanBeAHeapPointer(reinterpret_cast<uptr>(p))) continue;
161 uptr chunk = PointsIntoChunk(p);
162 if (!chunk) continue;
163 // Pointers to self don't count. This matters when tag == kIndirectlyLeaked.
164 if (chunk == begin) continue;
165 LsanMetadata m(chunk);
166 if (m.tag() == kReachable || m.tag() == kIgnored) continue;
167
168 // Do this check relatively late so we can log only the interesting cases.
169 if (!flags()->use_poisoned && WordIsPoisoned(pp)) {
170 LOG_POINTERS(do { if (flags()->log_pointers) Report("%p is poisoned: ignoring %p pointing into chunk %p-%p of size "
"%zu.\n", pp, p, chunk, chunk + m.requested_size(), m.requested_size
()); } while (0);
171 "%p is poisoned: ignoring %p pointing into chunk %p-%p of size "do { if (flags()->log_pointers) Report("%p is poisoned: ignoring %p pointing into chunk %p-%p of size "
"%zu.\n", pp, p, chunk, chunk + m.requested_size(), m.requested_size
()); } while (0);
172 "%zu.\n",do { if (flags()->log_pointers) Report("%p is poisoned: ignoring %p pointing into chunk %p-%p of size "
"%zu.\n", pp, p, chunk, chunk + m.requested_size(), m.requested_size
()); } while (0);
173 pp, p, chunk, chunk + m.requested_size(), m.requested_size())do { if (flags()->log_pointers) Report("%p is poisoned: ignoring %p pointing into chunk %p-%p of size "
"%zu.\n", pp, p, chunk, chunk + m.requested_size(), m.requested_size
()); } while (0);
;
174 continue;
175 }
176
177 m.set_tag(tag);
178 LOG_POINTERS("%p: found %p pointing into chunk %p-%p of size %zu.\n", pp, p,do { if (flags()->log_pointers) Report("%p: found %p pointing into chunk %p-%p of size %zu.\n"
, pp, p, chunk, chunk + m.requested_size(), m.requested_size(
)); } while (0);
179 chunk, chunk + m.requested_size(), m.requested_size())do { if (flags()->log_pointers) Report("%p: found %p pointing into chunk %p-%p of size %zu.\n"
, pp, p, chunk, chunk + m.requested_size(), m.requested_size(
)); } while (0);
;
180 if (frontier)
181 frontier->push_back(chunk);
182 }
183}
184
185// Scans a global range for pointers
186void ScanGlobalRange(uptr begin, uptr end, Frontier *frontier) {
187 uptr allocator_begin = 0, allocator_end = 0;
188 GetAllocatorGlobalRange(&allocator_begin, &allocator_end);
189 if (begin <= allocator_begin && allocator_begin < end) {
190 CHECK_LE(allocator_begin, allocator_end)do { __sanitizer::u64 v1 = (u64)((allocator_begin)); __sanitizer
::u64 v2 = (u64)((allocator_end)); if (__builtin_expect(!!(!(
v1 <= v2)), 0)) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 190, "(" "(allocator_begin)" ") " "<=" " (" "(allocator_end)"
")", v1, v2); } while (false)
;
191 CHECK_LE(allocator_end, end)do { __sanitizer::u64 v1 = (u64)((allocator_end)); __sanitizer
::u64 v2 = (u64)((end)); if (__builtin_expect(!!(!(v1 <= v2
)), 0)) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 191, "(" "(allocator_end)" ") " "<=" " (" "(end)" ")", v1
, v2); } while (false)
;
192 if (begin < allocator_begin)
193 ScanRangeForPointers(begin, allocator_begin, frontier, "GLOBAL",
194 kReachable);
195 if (allocator_end < end)
196 ScanRangeForPointers(allocator_end, end, frontier, "GLOBAL", kReachable);
197 } else {
198 ScanRangeForPointers(begin, end, frontier, "GLOBAL", kReachable);
199 }
200}
201
202void ForEachExtraStackRangeCb(uptr begin, uptr end, void* arg) {
203 Frontier *frontier = reinterpret_cast<Frontier *>(arg);
204 ScanRangeForPointers(begin, end, frontier, "FAKE STACK", kReachable);
205}
206
207// Scans thread data (stacks and TLS) for heap pointers.
208static void ProcessThreads(SuspendedThreadsList const &suspended_threads,
209 Frontier *frontier) {
210 InternalScopedBuffer<uptr> registers(suspended_threads.RegisterCount());
211 uptr registers_begin = reinterpret_cast<uptr>(registers.data());
212 uptr registers_end = registers_begin + registers.size();
213 for (uptr i = 0; i < suspended_threads.ThreadCount(); i++) {
214 tid_t os_id = static_cast<tid_t>(suspended_threads.GetThreadID(i));
215 LOG_THREADS("Processing thread %d.\n", os_id)do { if (flags()->log_threads) Report("Processing thread %d.\n"
, os_id); } while (0);
;
216 uptr stack_begin, stack_end, tls_begin, tls_end, cache_begin, cache_end;
217 DTLS *dtls;
218 bool thread_found = GetThreadRangesLocked(os_id, &stack_begin, &stack_end,
219 &tls_begin, &tls_end,
220 &cache_begin, &cache_end, &dtls);
221 if (!thread_found) {
222 // If a thread can't be found in the thread registry, it's probably in the
223 // process of destruction. Log this event and move on.
224 LOG_THREADS("Thread %d not found in registry.\n", os_id)do { if (flags()->log_threads) Report("Thread %d not found in registry.\n"
, os_id); } while (0);
;
225 continue;
226 }
227 uptr sp;
228 PtraceRegistersStatus have_registers =
229 suspended_threads.GetRegistersAndSP(i, registers.data(), &sp);
230 if (have_registers != REGISTERS_AVAILABLE) {
231 Report("Unable to get registers from thread %d.\n", os_id);
232 // If unable to get SP, consider the entire stack to be reachable unless
233 // GetRegistersAndSP failed with ESRCH.
234 if (have_registers == REGISTERS_UNAVAILABLE_FATAL) continue;
235 sp = stack_begin;
236 }
237
238 if (flags()->use_registers && have_registers)
239 ScanRangeForPointers(registers_begin, registers_end, frontier,
240 "REGISTERS", kReachable);
241
242 if (flags()->use_stacks) {
243 LOG_THREADS("Stack at %p-%p (SP = %p).\n", stack_begin, stack_end, sp)do { if (flags()->log_threads) Report("Stack at %p-%p (SP = %p).\n"
, stack_begin, stack_end, sp); } while (0);
;
244 if (sp < stack_begin || sp >= stack_end) {
245 // SP is outside the recorded stack range (e.g. the thread is running a
246 // signal handler on alternate stack, or swapcontext was used).
247 // Again, consider the entire stack range to be reachable.
248 LOG_THREADS("WARNING: stack pointer not in stack range.\n")do { if (flags()->log_threads) Report("WARNING: stack pointer not in stack range.\n"
); } while (0);
;
249 uptr page_size = GetPageSizeCached();
250 int skipped = 0;
251 while (stack_begin < stack_end &&
252 !IsAccessibleMemoryRange(stack_begin, 1)) {
253 skipped++;
254 stack_begin += page_size;
255 }
256 LOG_THREADS("Skipped %d guard page(s) to obtain stack %p-%p.\n",do { if (flags()->log_threads) Report("Skipped %d guard page(s) to obtain stack %p-%p.\n"
, skipped, stack_begin, stack_end); } while (0);
257 skipped, stack_begin, stack_end)do { if (flags()->log_threads) Report("Skipped %d guard page(s) to obtain stack %p-%p.\n"
, skipped, stack_begin, stack_end); } while (0);
;
258 } else {
259 // Shrink the stack range to ignore out-of-scope values.
260 stack_begin = sp;
261 }
262 ScanRangeForPointers(stack_begin, stack_end, frontier, "STACK",
263 kReachable);
264 ForEachExtraStackRange(os_id, ForEachExtraStackRangeCb, frontier);
265 }
266
267 if (flags()->use_tls) {
268 LOG_THREADS("TLS at %p-%p.\n", tls_begin, tls_end)do { if (flags()->log_threads) Report("TLS at %p-%p.\n", tls_begin
, tls_end); } while (0);
;
269 if (cache_begin == cache_end) {
270 ScanRangeForPointers(tls_begin, tls_end, frontier, "TLS", kReachable);
271 } else {
272 // Because LSan should not be loaded with dlopen(), we can assume
273 // that allocator cache will be part of static TLS image.
274 CHECK_LE(tls_begin, cache_begin)do { __sanitizer::u64 v1 = (u64)((tls_begin)); __sanitizer::u64
v2 = (u64)((cache_begin)); if (__builtin_expect(!!(!(v1 <=
v2)), 0)) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 274, "(" "(tls_begin)" ") " "<=" " (" "(cache_begin)" ")"
, v1, v2); } while (false)
;
275 CHECK_GE(tls_end, cache_end)do { __sanitizer::u64 v1 = (u64)((tls_end)); __sanitizer::u64
v2 = (u64)((cache_end)); if (__builtin_expect(!!(!(v1 >= v2
)), 0)) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 275, "(" "(tls_end)" ") " ">=" " (" "(cache_end)" ")", v1
, v2); } while (false)
;
276 if (tls_begin < cache_begin)
277 ScanRangeForPointers(tls_begin, cache_begin, frontier, "TLS",
278 kReachable);
279 if (tls_end > cache_end)
280 ScanRangeForPointers(cache_end, tls_end, frontier, "TLS", kReachable);
281 }
282 if (dtls && !DTLSInDestruction(dtls)) {
283 for (uptr j = 0; j < dtls->dtv_size; ++j) {
284 uptr dtls_beg = dtls->dtv[j].beg;
285 uptr dtls_end = dtls_beg + dtls->dtv[j].size;
286 if (dtls_beg < dtls_end) {
287 LOG_THREADS("DTLS %zu at %p-%p.\n", j, dtls_beg, dtls_end)do { if (flags()->log_threads) Report("DTLS %zu at %p-%p.\n"
, j, dtls_beg, dtls_end); } while (0);
;
288 ScanRangeForPointers(dtls_beg, dtls_end, frontier, "DTLS",
289 kReachable);
290 }
291 }
292 } else {
293 // We are handling a thread with DTLS under destruction. Log about
294 // this and continue.
295 LOG_THREADS("Thread %d has DTLS under destruction.\n", os_id)do { if (flags()->log_threads) Report("Thread %d has DTLS under destruction.\n"
, os_id); } while (0);
;
296 }
297 }
298 }
299}
300
301void ScanRootRegion(Frontier *frontier, const RootRegion &root_region,
302 uptr region_begin, uptr region_end, uptr prot) {
303 uptr intersection_begin = Max(root_region.begin, region_begin);
304 uptr intersection_end = Min(region_end, root_region.begin + root_region.size);
305 if (intersection_begin >= intersection_end) return;
306 bool is_readable = prot & MemoryMappingLayout::kProtectionRead;
307 LOG_POINTERS("Root region %p-%p intersects with mapped region %p-%p (%s)\n",do { if (flags()->log_pointers) Report("Root region %p-%p intersects with mapped region %p-%p (%s)\n"
, root_region.begin, root_region.begin + root_region.size, region_begin
, region_end, is_readable ? "readable" : "unreadable"); } while
(0);
308 root_region.begin, root_region.begin + root_region.size,do { if (flags()->log_pointers) Report("Root region %p-%p intersects with mapped region %p-%p (%s)\n"
, root_region.begin, root_region.begin + root_region.size, region_begin
, region_end, is_readable ? "readable" : "unreadable"); } while
(0);
309 region_begin, region_end,do { if (flags()->log_pointers) Report("Root region %p-%p intersects with mapped region %p-%p (%s)\n"
, root_region.begin, root_region.begin + root_region.size, region_begin
, region_end, is_readable ? "readable" : "unreadable"); } while
(0);
310 is_readable ? "readable" : "unreadable")do { if (flags()->log_pointers) Report("Root region %p-%p intersects with mapped region %p-%p (%s)\n"
, root_region.begin, root_region.begin + root_region.size, region_begin
, region_end, is_readable ? "readable" : "unreadable"); } while
(0);
;
311 if (is_readable)
312 ScanRangeForPointers(intersection_begin, intersection_end, frontier, "ROOT",
313 kReachable);
314}
315
316static void ProcessRootRegion(Frontier *frontier,
317 const RootRegion &root_region) {
318 MemoryMappingLayout proc_maps(/*cache_enabled*/ true);
319 uptr begin, end, prot;
320 while (proc_maps.Next(&begin, &end,
321 /*offset*/ nullptr, /*filename*/ nullptr,
322 /*filename_size*/ 0, &prot)) {
323 ScanRootRegion(frontier, root_region, begin, end, prot);
324 }
325}
326
327// Scans root regions for heap pointers.
328static void ProcessRootRegions(Frontier *frontier) {
329 if (!flags()->use_root_regions) return;
330 CHECK(root_regions)do { __sanitizer::u64 v1 = (u64)((root_regions)); __sanitizer
::u64 v2 = (u64)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)
) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 330, "(" "(root_regions)" ") " "!=" " (" "0" ")", v1, v2); }
while (false)
;
331 for (uptr i = 0; i < root_regions->size(); i++) {
332 ProcessRootRegion(frontier, (*root_regions)[i]);
333 }
334}
335
336static void FloodFillTag(Frontier *frontier, ChunkTag tag) {
337 while (frontier->size()) {
338 uptr next_chunk = frontier->back();
339 frontier->pop_back();
340 LsanMetadata m(next_chunk);
341 ScanRangeForPointers(next_chunk, next_chunk + m.requested_size(), frontier,
342 "HEAP", tag);
343 }
344}
345
346// ForEachChunk callback. If the chunk is marked as leaked, marks all chunks
347// which are reachable from it as indirectly leaked.
348static void MarkIndirectlyLeakedCb(uptr chunk, void *arg) {
349 chunk = GetUserBegin(chunk);
350 LsanMetadata m(chunk);
351 if (m.allocated() && m.tag() != kReachable) {
352 ScanRangeForPointers(chunk, chunk + m.requested_size(),
353 /* frontier */ nullptr, "HEAP", kIndirectlyLeaked);
354 }
355}
356
357// ForEachChunk callback. If chunk is marked as ignored, adds its address to
358// frontier.
359static void CollectIgnoredCb(uptr chunk, void *arg) {
360 CHECK(arg)do { __sanitizer::u64 v1 = (u64)((arg)); __sanitizer::u64 v2 =
(u64)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer
::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 360, "(" "(arg)" ") " "!=" " (" "0" ")", v1, v2); } while (
false)
;
361 chunk = GetUserBegin(chunk);
362 LsanMetadata m(chunk);
363 if (m.allocated() && m.tag() == kIgnored) {
364 LOG_POINTERS("Ignored: chunk %p-%p of size %zu.\n",do { if (flags()->log_pointers) Report("Ignored: chunk %p-%p of size %zu.\n"
, chunk, chunk + m.requested_size(), m.requested_size()); } while
(0);
365 chunk, chunk + m.requested_size(), m.requested_size())do { if (flags()->log_pointers) Report("Ignored: chunk %p-%p of size %zu.\n"
, chunk, chunk + m.requested_size(), m.requested_size()); } while
(0);
;
366 reinterpret_cast<Frontier *>(arg)->push_back(chunk);
367 }
368}
369
370static uptr GetCallerPC(u32 stack_id, StackDepotReverseMap *map) {
371 CHECK(stack_id)do { __sanitizer::u64 v1 = (u64)((stack_id)); __sanitizer::u64
v2 = (u64)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer
::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 371, "(" "(stack_id)" ") " "!=" " (" "0" ")", v1, v2); } while
(false)
;
372 StackTrace stack = map->Get(stack_id);
373 // The top frame is our malloc/calloc/etc. The next frame is the caller.
374 if (stack.size >= 2)
375 return stack.trace[1];
376 return 0;
377}
378
379struct InvalidPCParam {
380 Frontier *frontier;
381 StackDepotReverseMap *stack_depot_reverse_map;
382 bool skip_linker_allocations;
383};
384
385// ForEachChunk callback. If the caller pc is invalid or is within the linker,
386// mark as reachable. Called by ProcessPlatformSpecificAllocations.
387static void MarkInvalidPCCb(uptr chunk, void *arg) {
388 CHECK(arg)do { __sanitizer::u64 v1 = (u64)((arg)); __sanitizer::u64 v2 =
(u64)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer
::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 388, "(" "(arg)" ") " "!=" " (" "0" ")", v1, v2); } while (
false)
;
389 InvalidPCParam *param = reinterpret_cast<InvalidPCParam *>(arg);
390 chunk = GetUserBegin(chunk);
391 LsanMetadata m(chunk);
392 if (m.allocated() && m.tag() != kReachable && m.tag() != kIgnored) {
393 u32 stack_id = m.stack_trace_id();
394 uptr caller_pc = 0;
395 if (stack_id > 0)
396 caller_pc = GetCallerPC(stack_id, param->stack_depot_reverse_map);
397 // If caller_pc is unknown, this chunk may be allocated in a coroutine. Mark
398 // it as reachable, as we can't properly report its allocation stack anyway.
399 if (caller_pc == 0 || (param->skip_linker_allocations &&
400 GetLinker()->containsAddress(caller_pc))) {
401 m.set_tag(kReachable);
402 param->frontier->push_back(chunk);
403 }
404 }
405}
406
407// On Linux, handles dynamically allocated TLS blocks by treating all chunks
408// allocated from ld-linux.so as reachable.
409// Dynamic TLS blocks contain the TLS variables of dynamically loaded modules.
410// They are allocated with a __libc_memalign() call in allocate_and_init()
411// (elf/dl-tls.c). Glibc won't tell us the address ranges occupied by those
412// blocks, but we can make sure they come from our own allocator by intercepting
413// __libc_memalign(). On top of that, there is no easy way to reach them. Their
414// addresses are stored in a dynamically allocated array (the DTV) which is
415// referenced from the static TLS. Unfortunately, we can't just rely on the DTV
416// being reachable from the static TLS, and the dynamic TLS being reachable from
417// the DTV. This is because the initial DTV is allocated before our interception
418// mechanism kicks in, and thus we don't recognize it as allocated memory. We
419// can't special-case it either, since we don't know its size.
420// Our solution is to include in the root set all allocations made from
421// ld-linux.so (which is where allocate_and_init() is implemented). This is
422// guaranteed to include all dynamic TLS blocks (and possibly other allocations
423// which we don't care about).
424// On all other platforms, this simply checks to ensure that the caller pc is
425// valid before reporting chunks as leaked.
426void ProcessPC(Frontier *frontier) {
427 StackDepotReverseMap stack_depot_reverse_map;
428 InvalidPCParam arg;
429 arg.frontier = frontier;
430 arg.stack_depot_reverse_map = &stack_depot_reverse_map;
431 arg.skip_linker_allocations =
432 flags()->use_tls && flags()->use_ld_allocations && GetLinker() != nullptr;
433 ForEachChunk(MarkInvalidPCCb, &arg);
434}
435
436// Sets the appropriate tag on each chunk.
437static void ClassifyAllChunks(SuspendedThreadsList const &suspended_threads) {
438 // Holds the flood fill frontier.
439 Frontier frontier(1);
440
441 ForEachChunk(CollectIgnoredCb, &frontier);
442 ProcessGlobalRegions(&frontier);
443 ProcessThreads(suspended_threads, &frontier);
444 ProcessRootRegions(&frontier);
445 FloodFillTag(&frontier, kReachable);
446
447 CHECK_EQ(0, frontier.size())do { __sanitizer::u64 v1 = (u64)((0)); __sanitizer::u64 v2 = (
u64)((frontier.size())); if (__builtin_expect(!!(!(v1 == v2))
, 0)) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 447, "(" "(0)" ") " "==" " (" "(frontier.size())" ")", v1, v2
); } while (false)
;
448 ProcessPC(&frontier);
449
450 // The check here is relatively expensive, so we do this in a separate flood
451 // fill. That way we can skip the check for chunks that are reachable
452 // otherwise.
453 LOG_POINTERS("Processing platform-specific allocations.\n")do { if (flags()->log_pointers) Report("Processing platform-specific allocations.\n"
); } while (0);
;
454 ProcessPlatformSpecificAllocations(&frontier);
455 FloodFillTag(&frontier, kReachable);
456
457 // Iterate over leaked chunks and mark those that are reachable from other
458 // leaked chunks.
459 LOG_POINTERS("Scanning leaked chunks.\n")do { if (flags()->log_pointers) Report("Scanning leaked chunks.\n"
); } while (0);
;
460 ForEachChunk(MarkIndirectlyLeakedCb, nullptr);
461}
462
463// ForEachChunk callback. Resets the tags to pre-leak-check state.
464static void ResetTagsCb(uptr chunk, void *arg) {
465 (void)arg;
466 chunk = GetUserBegin(chunk);
467 LsanMetadata m(chunk);
468 if (m.allocated() && m.tag() != kIgnored)
469 m.set_tag(kDirectlyLeaked);
470}
471
472static void PrintStackTraceById(u32 stack_trace_id) {
473 CHECK(stack_trace_id)do { __sanitizer::u64 v1 = (u64)((stack_trace_id)); __sanitizer
::u64 v2 = (u64)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)
) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 473, "(" "(stack_trace_id)" ") " "!=" " (" "0" ")", v1, v2)
; } while (false)
;
474 StackDepotGet(stack_trace_id).Print();
475}
476
477// ForEachChunk callback. Aggregates information about unreachable chunks into
478// a LeakReport.
479static void CollectLeaksCb(uptr chunk, void *arg) {
480 CHECK(arg)do { __sanitizer::u64 v1 = (u64)((arg)); __sanitizer::u64 v2 =
(u64)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer
::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 480, "(" "(arg)" ") " "!=" " (" "0" ")", v1, v2); } while (
false)
;
481 LeakReport *leak_report = reinterpret_cast<LeakReport *>(arg);
482 chunk = GetUserBegin(chunk);
483 LsanMetadata m(chunk);
484 if (!m.allocated()) return;
485 if (m.tag() == kDirectlyLeaked || m.tag() == kIndirectlyLeaked) {
486 u32 resolution = flags()->resolution;
487 u32 stack_trace_id = 0;
488 if (resolution > 0) {
489 StackTrace stack = StackDepotGet(m.stack_trace_id());
490 stack.size = Min(stack.size, resolution);
491 stack_trace_id = StackDepotPut(stack);
492 } else {
493 stack_trace_id = m.stack_trace_id();
494 }
495 leak_report->AddLeakedChunk(chunk, stack_trace_id, m.requested_size(),
496 m.tag());
497 }
498}
499
500static void PrintMatchedSuppressions() {
501 InternalMmapVector<Suppression *> matched(1);
502 GetSuppressionContext()->GetMatched(&matched);
503 if (!matched.size())
504 return;
505 const char *line = "-----------------------------------------------------";
506 Printf("%s\n", line);
507 Printf("Suppressions used:\n");
508 Printf(" count bytes template\n");
509 for (uptr i = 0; i < matched.size(); i++)
510 Printf("%7zu %10zu %s\n", static_cast<uptr>(atomic_load_relaxed(
511 &matched[i]->hit_count)), matched[i]->weight, matched[i]->templ);
512 Printf("%s\n\n", line);
513}
514
515struct CheckForLeaksParam {
516 bool success;
517 LeakReport leak_report;
518};
519
520static void CheckForLeaksCallback(const SuspendedThreadsList &suspended_threads,
521 void *arg) {
522 CheckForLeaksParam *param = reinterpret_cast<CheckForLeaksParam *>(arg);
523 CHECK(param)do { __sanitizer::u64 v1 = (u64)((param)); __sanitizer::u64 v2
= (u64)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer
::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 523, "(" "(param)" ") " "!=" " (" "0" ")", v1, v2); } while
(false)
;
524 CHECK(!param->success)do { __sanitizer::u64 v1 = (u64)((!param->success)); __sanitizer
::u64 v2 = (u64)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)
) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 524, "(" "(!param->success)" ") " "!=" " (" "0" ")", v1,
v2); } while (false)
;
525 ClassifyAllChunks(suspended_threads);
526 ForEachChunk(CollectLeaksCb, &param->leak_report);
527 // Clean up for subsequent leak checks. This assumes we did not overwrite any
528 // kIgnored tags.
529 ForEachChunk(ResetTagsCb, nullptr);
530 param->success = true;
531}
532
533static bool CheckForLeaks() {
534 if (&__lsan_is_turned_off && __lsan_is_turned_off())
535 return false;
536 EnsureMainThreadIDIsCorrect();
537 CheckForLeaksParam param;
538 param.success = false;
539 LockThreadRegistry();
540 LockAllocator();
541 DoStopTheWorld(CheckForLeaksCallback, &param);
542 UnlockAllocator();
543 UnlockThreadRegistry();
544
545 if (!param.success) {
546 Report("LeakSanitizer has encountered a fatal error.\n");
547 Report(
548 "HINT: For debugging, try setting environment variable "
549 "LSAN_OPTIONS=verbosity=1:log_threads=1\n");
550 Report(
551 "HINT: LeakSanitizer does not work under ptrace (strace, gdb, etc)\n");
552 Die();
553 }
554 param.leak_report.ApplySuppressions();
555 uptr unsuppressed_count = param.leak_report.UnsuppressedLeakCount();
556 if (unsuppressed_count > 0) {
557 Decorator d;
558 Printf("\n"
559 "================================================================="
560 "\n");
561 Printf("%s", d.Error());
562 Report("ERROR: LeakSanitizer: detected memory leaks\n");
563 Printf("%s", d.End());
564 param.leak_report.ReportTopLeaks(flags()->max_leaks);
565 }
566 if (common_flags()->print_suppressions)
567 PrintMatchedSuppressions();
568 if (unsuppressed_count > 0) {
569 param.leak_report.PrintSummary();
570 return true;
571 }
572 return false;
573}
574
575void DoLeakCheck() {
576 BlockingMutexLock l(&global_mutex);
577 static bool already_done;
578 if (already_done) return;
579 already_done = true;
580 bool have_leaks = CheckForLeaks();
581 if (!have_leaks) {
582 return;
583 }
584 if (common_flags()->exitcode) {
585 Die();
586 }
587}
588
589static int DoRecoverableLeakCheck() {
590 BlockingMutexLock l(&global_mutex);
591 bool have_leaks = CheckForLeaks();
592 return have_leaks ? 1 : 0;
593}
594
595static Suppression *GetSuppressionForAddr(uptr addr) {
596 Suppression *s = nullptr;
597
598 // Suppress by module name.
599 SuppressionContext *suppressions = GetSuppressionContext();
600 if (const char *module_name =
1
Taking false branch
601 Symbolizer::GetOrInit()->GetModuleNameForPc(addr))
602 if (suppressions->Match(module_name, kSuppressionLeak, &s))
603 return s;
604
605 // Suppress by file or function name.
606 SymbolizedStack *frames = Symbolizer::GetOrInit()->SymbolizePC(addr);
2
'frames' initialized here
607 for (SymbolizedStack *cur = frames; cur; cur = cur->next) {
3
Assuming pointer value is null
4
Loop condition is false. Execution continues on line 613
608 if (suppressions->Match(cur->info.function, kSuppressionLeak, &s) ||
609 suppressions->Match(cur->info.file, kSuppressionLeak, &s)) {
610 break;
611 }
612 }
613 frames->ClearAll();
5
Called C++ object pointer is null
614 return s;
615}
616
617static Suppression *GetSuppressionForStack(u32 stack_trace_id) {
618 StackTrace stack = StackDepotGet(stack_trace_id);
619 for (uptr i = 0; i < stack.size; i++) {
620 Suppression *s = GetSuppressionForAddr(
621 StackTrace::GetPreviousInstructionPc(stack.trace[i]));
622 if (s) return s;
623 }
624 return nullptr;
625}
626
627///// LeakReport implementation. /////
628
629// A hard limit on the number of distinct leaks, to avoid quadratic complexity
630// in LeakReport::AddLeakedChunk(). We don't expect to ever see this many leaks
631// in real-world applications.
632// FIXME: Get rid of this limit by changing the implementation of LeakReport to
633// use a hash table.
634const uptr kMaxLeaksConsidered = 5000;
635
636void LeakReport::AddLeakedChunk(uptr chunk, u32 stack_trace_id,
637 uptr leaked_size, ChunkTag tag) {
638 CHECK(tag == kDirectlyLeaked || tag == kIndirectlyLeaked)do { __sanitizer::u64 v1 = (u64)((tag == kDirectlyLeaked || tag
== kIndirectlyLeaked)); __sanitizer::u64 v2 = (u64)(0); if (
__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed
("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 638, "(" "(tag == kDirectlyLeaked || tag == kIndirectlyLeaked)"
") " "!=" " (" "0" ")", v1, v2); } while (false)
;
639 bool is_directly_leaked = (tag == kDirectlyLeaked);
640 uptr i;
641 for (i = 0; i < leaks_.size(); i++) {
642 if (leaks_[i].stack_trace_id == stack_trace_id &&
643 leaks_[i].is_directly_leaked == is_directly_leaked) {
644 leaks_[i].hit_count++;
645 leaks_[i].total_size += leaked_size;
646 break;
647 }
648 }
649 if (i == leaks_.size()) {
650 if (leaks_.size() == kMaxLeaksConsidered) return;
651 Leak leak = { next_id_++, /* hit_count */ 1, leaked_size, stack_trace_id,
652 is_directly_leaked, /* is_suppressed */ false };
653 leaks_.push_back(leak);
654 }
655 if (flags()->report_objects) {
656 LeakedObject obj = {leaks_[i].id, chunk, leaked_size};
657 leaked_objects_.push_back(obj);
658 }
659}
660
661static bool LeakComparator(const Leak &leak1, const Leak &leak2) {
662 if (leak1.is_directly_leaked == leak2.is_directly_leaked)
663 return leak1.total_size > leak2.total_size;
664 else
665 return leak1.is_directly_leaked;
666}
667
668void LeakReport::ReportTopLeaks(uptr num_leaks_to_report) {
669 CHECK(leaks_.size() <= kMaxLeaksConsidered)do { __sanitizer::u64 v1 = (u64)((leaks_.size() <= kMaxLeaksConsidered
)); __sanitizer::u64 v2 = (u64)(0); if (__builtin_expect(!!(!
(v1 != v2)), 0)) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 669, "(" "(leaks_.size() <= kMaxLeaksConsidered)" ") " "!="
" (" "0" ")", v1, v2); } while (false)
;
670 Printf("\n");
671 if (leaks_.size() == kMaxLeaksConsidered)
672 Printf("Too many leaks! Only the first %zu leaks encountered will be "
673 "reported.\n",
674 kMaxLeaksConsidered);
675
676 uptr unsuppressed_count = UnsuppressedLeakCount();
677 if (num_leaks_to_report > 0 && num_leaks_to_report < unsuppressed_count)
678 Printf("The %zu top leak(s):\n", num_leaks_to_report);
679 InternalSort(&leaks_, leaks_.size(), LeakComparator);
680 uptr leaks_reported = 0;
681 for (uptr i = 0; i < leaks_.size(); i++) {
682 if (leaks_[i].is_suppressed) continue;
683 PrintReportForLeak(i);
684 leaks_reported++;
685 if (leaks_reported == num_leaks_to_report) break;
686 }
687 if (leaks_reported < unsuppressed_count) {
688 uptr remaining = unsuppressed_count - leaks_reported;
689 Printf("Omitting %zu more leak(s).\n", remaining);
690 }
691}
692
693void LeakReport::PrintReportForLeak(uptr index) {
694 Decorator d;
695 Printf("%s", d.Leak());
696 Printf("%s leak of %zu byte(s) in %zu object(s) allocated from:\n",
697 leaks_[index].is_directly_leaked ? "Direct" : "Indirect",
698 leaks_[index].total_size, leaks_[index].hit_count);
699 Printf("%s", d.End());
700
701 PrintStackTraceById(leaks_[index].stack_trace_id);
702
703 if (flags()->report_objects) {
704 Printf("Objects leaked above:\n");
705 PrintLeakedObjectsForLeak(index);
706 Printf("\n");
707 }
708}
709
710void LeakReport::PrintLeakedObjectsForLeak(uptr index) {
711 u32 leak_id = leaks_[index].id;
712 for (uptr j = 0; j < leaked_objects_.size(); j++) {
713 if (leaked_objects_[j].leak_id == leak_id)
714 Printf("%p (%zu bytes)\n", leaked_objects_[j].addr,
715 leaked_objects_[j].size);
716 }
717}
718
719void LeakReport::PrintSummary() {
720 CHECK(leaks_.size() <= kMaxLeaksConsidered)do { __sanitizer::u64 v1 = (u64)((leaks_.size() <= kMaxLeaksConsidered
)); __sanitizer::u64 v2 = (u64)(0); if (__builtin_expect(!!(!
(v1 != v2)), 0)) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 720, "(" "(leaks_.size() <= kMaxLeaksConsidered)" ") " "!="
" (" "0" ")", v1, v2); } while (false)
;
721 uptr bytes = 0, allocations = 0;
722 for (uptr i = 0; i < leaks_.size(); i++) {
723 if (leaks_[i].is_suppressed) continue;
724 bytes += leaks_[i].total_size;
725 allocations += leaks_[i].hit_count;
726 }
727 InternalScopedString summary(kMaxSummaryLength);
728 summary.append("%zu byte(s) leaked in %zu allocation(s).", bytes,
729 allocations);
730 ReportErrorSummary(summary.data());
731}
732
733void LeakReport::ApplySuppressions() {
734 for (uptr i = 0; i < leaks_.size(); i++) {
735 Suppression *s = GetSuppressionForStack(leaks_[i].stack_trace_id);
736 if (s) {
737 s->weight += leaks_[i].total_size;
738 atomic_store_relaxed(&s->hit_count, atomic_load_relaxed(&s->hit_count) +
739 leaks_[i].hit_count);
740 leaks_[i].is_suppressed = true;
741 }
742 }
743}
744
745uptr LeakReport::UnsuppressedLeakCount() {
746 uptr result = 0;
747 for (uptr i = 0; i < leaks_.size(); i++)
748 if (!leaks_[i].is_suppressed) result++;
749 return result;
750}
751
752} // namespace __lsan
753#else // CAN_SANITIZE_LEAKS
754namespace __lsan {
755void InitCommonLsan() { }
756void DoLeakCheck() { }
757void DisableInThisThread() { }
758void EnableInThisThread() { }
759}
760#endif // CAN_SANITIZE_LEAKS
761
762using namespace __lsan; // NOLINT
763
764extern "C" {
765SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default")))
766void __lsan_ignore_object(const void *p) {
767#if CAN_SANITIZE_LEAKS1
768 if (!common_flags()->detect_leaks)
769 return;
770 // Cannot use PointsIntoChunk or LsanMetadata here, since the allocator is not
771 // locked.
772 BlockingMutexLock l(&global_mutex);
773 IgnoreObjectResult res = IgnoreObjectLocked(p);
774 if (res == kIgnoreObjectInvalid)
775 VReport(1, "__lsan_ignore_object(): no heap object found at %p", p)do { if ((uptr)Verbosity() >= (1)) Report("__lsan_ignore_object(): no heap object found at %p"
, p); } while (0)
;
776 if (res == kIgnoreObjectAlreadyIgnored)
777 VReport(1, "__lsan_ignore_object(): "do { if ((uptr)Verbosity() >= (1)) Report("__lsan_ignore_object(): "
"heap object at %p is already being ignored\n", p); } while (
0)
778 "heap object at %p is already being ignored\n", p)do { if ((uptr)Verbosity() >= (1)) Report("__lsan_ignore_object(): "
"heap object at %p is already being ignored\n", p); } while (
0)
;
779 if (res == kIgnoreObjectSuccess)
780 VReport(1, "__lsan_ignore_object(): ignoring heap object at %p\n", p)do { if ((uptr)Verbosity() >= (1)) Report("__lsan_ignore_object(): ignoring heap object at %p\n"
, p); } while (0)
;
781#endif // CAN_SANITIZE_LEAKS
782}
783
784SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default")))
785void __lsan_register_root_region(const void *begin, uptr size) {
786#if CAN_SANITIZE_LEAKS1
787 BlockingMutexLock l(&global_mutex);
788 CHECK(root_regions)do { __sanitizer::u64 v1 = (u64)((root_regions)); __sanitizer
::u64 v2 = (u64)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)
) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 788, "(" "(root_regions)" ") " "!=" " (" "0" ")", v1, v2); }
while (false)
;
789 RootRegion region = {reinterpret_cast<uptr>(begin), size};
790 root_regions->push_back(region);
791 VReport(1, "Registered root region at %p of size %llu\n", begin, size)do { if ((uptr)Verbosity() >= (1)) Report("Registered root region at %p of size %llu\n"
, begin, size); } while (0)
;
792#endif // CAN_SANITIZE_LEAKS
793}
794
795SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default")))
796void __lsan_unregister_root_region(const void *begin, uptr size) {
797#if CAN_SANITIZE_LEAKS1
798 BlockingMutexLock l(&global_mutex);
799 CHECK(root_regions)do { __sanitizer::u64 v1 = (u64)((root_regions)); __sanitizer
::u64 v2 = (u64)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)
) __sanitizer::CheckFailed("/tmp/buildd/llvm-toolchain-snapshot-5.0~svn303373/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 799, "(" "(root_regions)" ") " "!=" " (" "0" ")", v1, v2); }
while (false)
;
800 bool removed = false;
801 for (uptr i = 0; i < root_regions->size(); i++) {
802 RootRegion region = (*root_regions)[i];
803 if (region.begin == reinterpret_cast<uptr>(begin) && region.size == size) {
804 removed = true;
805 uptr last_index = root_regions->size() - 1;
806 (*root_regions)[i] = (*root_regions)[last_index];
807 root_regions->pop_back();
808 VReport(1, "Unregistered root region at %p of size %llu\n", begin, size)do { if ((uptr)Verbosity() >= (1)) Report("Unregistered root region at %p of size %llu\n"
, begin, size); } while (0)
;
809 break;
810 }
811 }
812 if (!removed) {
813 Report(
814 "__lsan_unregister_root_region(): region at %p of size %llu has not "
815 "been registered.\n",
816 begin, size);
817 Die();
818 }
819#endif // CAN_SANITIZE_LEAKS
820}
821
822SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default")))
823void __lsan_disable() {
824#if CAN_SANITIZE_LEAKS1
825 __lsan::DisableInThisThread();
826#endif
827}
828
829SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default")))
830void __lsan_enable() {
831#if CAN_SANITIZE_LEAKS1
832 __lsan::EnableInThisThread();
833#endif
834}
835
836SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default")))
837void __lsan_do_leak_check() {
838#if CAN_SANITIZE_LEAKS1
839 if (common_flags()->detect_leaks)
840 __lsan::DoLeakCheck();
841#endif // CAN_SANITIZE_LEAKS
842}
843
844SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default")))
845int __lsan_do_recoverable_leak_check() {
846#if CAN_SANITIZE_LEAKS1
847 if (common_flags()->detect_leaks)
848 return __lsan::DoRecoverableLeakCheck();
849#endif // CAN_SANITIZE_LEAKS
850 return 0;
851}
852
853#if !SANITIZER_SUPPORTS_WEAK_HOOKS1
854SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default"))) SANITIZER_WEAK_ATTRIBUTE__attribute__((weak))
855int __lsan_is_turned_off() {
856 return 0;
857}
858
859SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default"))) SANITIZER_WEAK_ATTRIBUTE__attribute__((weak))
860const char *__lsan_default_suppressions() {
861 return "";
862}
863#endif
864} // extern "C"