Bug Summary

File:projects/compiler-rt/lib/lsan/lsan_common.cc
Warning:line 647, column 3
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name lsan_common.cc -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-9/lib/clang/9.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-9~svn362543/build-llvm/projects/compiler-rt/lib/lsan -I /build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan -I /build/llvm-toolchain-snapshot-9~svn362543/build-llvm/include -I /build/llvm-toolchain-snapshot-9~svn362543/include -I /build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/.. -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/include/clang/9.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-9/lib/clang/9.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -Wno-unused-parameter -Wno-variadic-macros -Wno-non-virtual-dtor -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-9~svn362543/build-llvm/projects/compiler-rt/lib/lsan -fdebug-prefix-map=/build/llvm-toolchain-snapshot-9~svn362543=. -ferror-limit 19 -fmessage-length 0 -fvisibility hidden -fvisibility-inlines-hidden -fno-builtin -fno-rtti -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2019-06-05-060531-1271-1 -x c++ /build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc -faddrsig
1//=-- lsan_common.cc ------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file is a part of LeakSanitizer.
10// Implementation of common leak checking functionality.
11//
12//===----------------------------------------------------------------------===//
13
14#include "lsan_common.h"
15
16#include "sanitizer_common/sanitizer_common.h"
17#include "sanitizer_common/sanitizer_flag_parser.h"
18#include "sanitizer_common/sanitizer_flags.h"
19#include "sanitizer_common/sanitizer_placement_new.h"
20#include "sanitizer_common/sanitizer_procmaps.h"
21#include "sanitizer_common/sanitizer_report_decorator.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_thread_registry.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#if SANITIZER_MAC0
78 // For Darwin and os_log/os_trace: https://reviews.llvm.org/D35173
79 "leak:*_os_trace*\n"
80#endif
81 // TLS leak in some glibc versions, described in
82 // https://sourceware.org/bugzilla/show_bug.cgi?id=12650.
83 "leak:*tls_get_addr*\n";
84
85void InitializeSuppressions() {
86 CHECK_EQ(nullptr, suppression_ctx)do { __sanitizer::u64 v1 = (__sanitizer::u64)((nullptr)); __sanitizer
::u64 v2 = (__sanitizer::u64)((suppression_ctx)); if (__builtin_expect
(!!(!(v1 == v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 86, "(" "(nullptr)" ") " "==" " (" "(suppression_ctx)" ")",
v1, v2); } while (false);
87 suppression_ctx = new (suppression_placeholder) // NOLINT
88 SuppressionContext(kSuppressionTypes, ARRAY_SIZE(kSuppressionTypes)(sizeof(kSuppressionTypes)/sizeof((kSuppressionTypes)[0])));
89 suppression_ctx->ParseFromFile(flags()->suppressions);
90 if (&__lsan_default_suppressions)
91 suppression_ctx->Parse(__lsan_default_suppressions());
92 suppression_ctx->Parse(kStdSuppressions);
93}
94
95static SuppressionContext *GetSuppressionContext() {
96 CHECK(suppression_ctx)do { __sanitizer::u64 v1 = (__sanitizer::u64)((suppression_ctx
)); __sanitizer::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 96, "(" "(suppression_ctx)" ") " "!=" " (" "0" ")", v1, v2)
; } while (false);
97 return suppression_ctx;
98}
99
100static InternalMmapVector<RootRegion> *root_regions;
101
102InternalMmapVector<RootRegion> const *GetRootRegions() { return root_regions; }
103
104void InitializeRootRegions() {
105 CHECK(!root_regions)do { __sanitizer::u64 v1 = (__sanitizer::u64)((!root_regions)
); __sanitizer::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 105, "(" "(!root_regions)" ") " "!=" " (" "0" ")", v1, v2);
} while (false);
106 ALIGNED(64)__attribute__((aligned(64))) static char placeholder[sizeof(InternalMmapVector<RootRegion>)];
107 root_regions = new (placeholder) InternalMmapVector<RootRegion>(); // NOLINT
108}
109
110const char *MaybeCallLsanDefaultOptions() {
111 return (&__lsan_default_options) ? __lsan_default_options() : "";
112}
113
114void InitCommonLsan() {
115 InitializeRootRegions();
116 if (common_flags()->detect_leaks) {
117 // Initialization which can fail or print warnings should only be done if
118 // LSan is actually enabled.
119 InitializeSuppressions();
120 InitializePlatformSpecificModules();
121 }
122}
123
124class Decorator: public __sanitizer::SanitizerCommonDecorator {
125 public:
126 Decorator() : SanitizerCommonDecorator() { }
127 const char *Error() { return Red(); }
128 const char *Leak() { return Blue(); }
129};
130
131static inline bool CanBeAHeapPointer(uptr p) {
132 // Since our heap is located in mmap-ed memory, we can assume a sensible lower
133 // bound on heap addresses.
134 const uptr kMinAddress = 4 * 4096;
135 if (p < kMinAddress) return false;
136#if defined(__x86_64__1)
137 // Accept only canonical form user-space addresses.
138 return ((p >> 47) == 0);
139#elif defined(__mips64)
140 return ((p >> 40) == 0);
141#elif defined(__aarch64__)
142 unsigned runtimeVMA =
143 (MostSignificantSetBitIndex(GET_CURRENT_FRAME()(__sanitizer::uptr) __builtin_frame_address(0)) + 1);
144 return ((p >> runtimeVMA) == 0);
145#else
146 return true;
147#endif
148}
149
150// Scans the memory range, looking for byte patterns that point into allocator
151// chunks. Marks those chunks with |tag| and adds them to |frontier|.
152// There are two usage modes for this function: finding reachable chunks
153// (|tag| = kReachable) and finding indirectly leaked chunks
154// (|tag| = kIndirectlyLeaked). In the second case, there's no flood fill,
155// so |frontier| = 0.
156void ScanRangeForPointers(uptr begin, uptr end,
157 Frontier *frontier,
158 const char *region_type, ChunkTag tag) {
159 CHECK(tag == kReachable || tag == kIndirectlyLeaked)do { __sanitizer::u64 v1 = (__sanitizer::u64)((tag == kReachable
|| tag == kIndirectlyLeaked)); __sanitizer::u64 v2 = (__sanitizer
::u64)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer
::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 159, "(" "(tag == kReachable || tag == kIndirectlyLeaked)" ") "
"!=" " (" "0" ")", v1, v2); } while (false);
160 const uptr alignment = flags()->pointer_alignment();
161 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);
162 uptr pp = begin;
163 if (pp % alignment)
164 pp = pp + alignment - pp % alignment;
165 for (; pp + sizeof(void *) <= end; pp += alignment) { // NOLINT
166 void *p = *reinterpret_cast<void **>(pp);
167 if (!CanBeAHeapPointer(reinterpret_cast<uptr>(p))) continue;
168 uptr chunk = PointsIntoChunk(p);
169 if (!chunk) continue;
170 // Pointers to self don't count. This matters when tag == kIndirectlyLeaked.
171 if (chunk == begin) continue;
172 LsanMetadata m(chunk);
173 if (m.tag() == kReachable || m.tag() == kIgnored) continue;
174
175 // Do this check relatively late so we can log only the interesting cases.
176 if (!flags()->use_poisoned && WordIsPoisoned(pp)) {
177 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)
178 "%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)
179 "%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)
180 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);
181 continue;
182 }
183
184 m.set_tag(tag);
185 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)
186 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);
187 if (frontier)
188 frontier->push_back(chunk);
189 }
190}
191
192// Scans a global range for pointers
193void ScanGlobalRange(uptr begin, uptr end, Frontier *frontier) {
194 uptr allocator_begin = 0, allocator_end = 0;
195 GetAllocatorGlobalRange(&allocator_begin, &allocator_end);
196 if (begin <= allocator_begin && allocator_begin < end) {
197 CHECK_LE(allocator_begin, allocator_end)do { __sanitizer::u64 v1 = (__sanitizer::u64)((allocator_begin
)); __sanitizer::u64 v2 = (__sanitizer::u64)((allocator_end))
; if (__builtin_expect(!!(!(v1 <= v2)), 0)) __sanitizer::CheckFailed
("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 197, "(" "(allocator_begin)" ") " "<=" " (" "(allocator_end)"
")", v1, v2); } while (false);
198 CHECK_LE(allocator_end, end)do { __sanitizer::u64 v1 = (__sanitizer::u64)((allocator_end)
); __sanitizer::u64 v2 = (__sanitizer::u64)((end)); if (__builtin_expect
(!!(!(v1 <= v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 198, "(" "(allocator_end)" ") " "<=" " (" "(end)" ")", v1
, v2); } while (false);
199 if (begin < allocator_begin)
200 ScanRangeForPointers(begin, allocator_begin, frontier, "GLOBAL",
201 kReachable);
202 if (allocator_end < end)
203 ScanRangeForPointers(allocator_end, end, frontier, "GLOBAL", kReachable);
204 } else {
205 ScanRangeForPointers(begin, end, frontier, "GLOBAL", kReachable);
206 }
207}
208
209void ForEachExtraStackRangeCb(uptr begin, uptr end, void* arg) {
210 Frontier *frontier = reinterpret_cast<Frontier *>(arg);
211 ScanRangeForPointers(begin, end, frontier, "FAKE STACK", kReachable);
212}
213
214// Scans thread data (stacks and TLS) for heap pointers.
215static void ProcessThreads(SuspendedThreadsList const &suspended_threads,
216 Frontier *frontier) {
217 InternalMmapVector<uptr> registers(suspended_threads.RegisterCount());
218 uptr registers_begin = reinterpret_cast<uptr>(registers.data());
219 uptr registers_end =
220 reinterpret_cast<uptr>(registers.data() + registers.size());
221 for (uptr i = 0; i < suspended_threads.ThreadCount(); i++) {
222 tid_t os_id = static_cast<tid_t>(suspended_threads.GetThreadID(i));
223 LOG_THREADS("Processing thread %d.\n", os_id)do { if (flags()->log_threads) Report("Processing thread %d.\n"
, os_id); } while (0);
224 uptr stack_begin, stack_end, tls_begin, tls_end, cache_begin, cache_end;
225 DTLS *dtls;
226 bool thread_found = GetThreadRangesLocked(os_id, &stack_begin, &stack_end,
227 &tls_begin, &tls_end,
228 &cache_begin, &cache_end, &dtls);
229 if (!thread_found) {
230 // If a thread can't be found in the thread registry, it's probably in the
231 // process of destruction. Log this event and move on.
232 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);
233 continue;
234 }
235 uptr sp;
236 PtraceRegistersStatus have_registers =
237 suspended_threads.GetRegistersAndSP(i, registers.data(), &sp);
238 if (have_registers != REGISTERS_AVAILABLE) {
239 Report("Unable to get registers from thread %d.\n", os_id);
240 // If unable to get SP, consider the entire stack to be reachable unless
241 // GetRegistersAndSP failed with ESRCH.
242 if (have_registers == REGISTERS_UNAVAILABLE_FATAL) continue;
243 sp = stack_begin;
244 }
245
246 if (flags()->use_registers && have_registers)
247 ScanRangeForPointers(registers_begin, registers_end, frontier,
248 "REGISTERS", kReachable);
249
250 if (flags()->use_stacks) {
251 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);
252 if (sp < stack_begin || sp >= stack_end) {
253 // SP is outside the recorded stack range (e.g. the thread is running a
254 // signal handler on alternate stack, or swapcontext was used).
255 // Again, consider the entire stack range to be reachable.
256 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);
257 uptr page_size = GetPageSizeCached();
258 int skipped = 0;
259 while (stack_begin < stack_end &&
260 !IsAccessibleMemoryRange(stack_begin, 1)) {
261 skipped++;
262 stack_begin += page_size;
263 }
264 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)
265 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);
266 } else {
267 // Shrink the stack range to ignore out-of-scope values.
268 stack_begin = sp;
269 }
270 ScanRangeForPointers(stack_begin, stack_end, frontier, "STACK",
271 kReachable);
272 ForEachExtraStackRange(os_id, ForEachExtraStackRangeCb, frontier);
273 }
274
275 if (flags()->use_tls) {
276 if (tls_begin) {
277 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);
278 // If the tls and cache ranges don't overlap, scan full tls range,
279 // otherwise, only scan the non-overlapping portions
280 if (cache_begin == cache_end || tls_end < cache_begin ||
281 tls_begin > cache_end) {
282 ScanRangeForPointers(tls_begin, tls_end, frontier, "TLS", kReachable);
283 } else {
284 if (tls_begin < cache_begin)
285 ScanRangeForPointers(tls_begin, cache_begin, frontier, "TLS",
286 kReachable);
287 if (tls_end > cache_end)
288 ScanRangeForPointers(cache_end, tls_end, frontier, "TLS",
289 kReachable);
290 }
291 }
292 if (dtls && !DTLSInDestruction(dtls)) {
293 for (uptr j = 0; j < dtls->dtv_size; ++j) {
294 uptr dtls_beg = dtls->dtv[j].beg;
295 uptr dtls_end = dtls_beg + dtls->dtv[j].size;
296 if (dtls_beg < dtls_end) {
297 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);
298 ScanRangeForPointers(dtls_beg, dtls_end, frontier, "DTLS",
299 kReachable);
300 }
301 }
302 } else {
303 // We are handling a thread with DTLS under destruction. Log about
304 // this and continue.
305 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);
306 }
307 }
308 }
309}
310
311void ScanRootRegion(Frontier *frontier, const RootRegion &root_region,
312 uptr region_begin, uptr region_end, bool is_readable) {
313 uptr intersection_begin = Max(root_region.begin, region_begin);
314 uptr intersection_end = Min(region_end, root_region.begin + root_region.size);
315 if (intersection_begin >= intersection_end) return;
316 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)
317 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)
318 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)
319 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);
320 if (is_readable)
321 ScanRangeForPointers(intersection_begin, intersection_end, frontier, "ROOT",
322 kReachable);
323}
324
325static void ProcessRootRegion(Frontier *frontier,
326 const RootRegion &root_region) {
327 MemoryMappingLayout proc_maps(/*cache_enabled*/ true);
328 MemoryMappedSegment segment;
329 while (proc_maps.Next(&segment)) {
330 ScanRootRegion(frontier, root_region, segment.start, segment.end,
331 segment.IsReadable());
332 }
333}
334
335// Scans root regions for heap pointers.
336static void ProcessRootRegions(Frontier *frontier) {
337 if (!flags()->use_root_regions) return;
338 CHECK(root_regions)do { __sanitizer::u64 v1 = (__sanitizer::u64)((root_regions))
; __sanitizer::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 338, "(" "(root_regions)" ") " "!=" " (" "0" ")", v1, v2); }
while (false);
339 for (uptr i = 0; i < root_regions->size(); i++) {
340 ProcessRootRegion(frontier, (*root_regions)[i]);
341 }
342}
343
344static void FloodFillTag(Frontier *frontier, ChunkTag tag) {
345 while (frontier->size()) {
346 uptr next_chunk = frontier->back();
347 frontier->pop_back();
348 LsanMetadata m(next_chunk);
349 ScanRangeForPointers(next_chunk, next_chunk + m.requested_size(), frontier,
350 "HEAP", tag);
351 }
352}
353
354// ForEachChunk callback. If the chunk is marked as leaked, marks all chunks
355// which are reachable from it as indirectly leaked.
356static void MarkIndirectlyLeakedCb(uptr chunk, void *arg) {
357 chunk = GetUserBegin(chunk);
358 LsanMetadata m(chunk);
359 if (m.allocated() && m.tag() != kReachable) {
360 ScanRangeForPointers(chunk, chunk + m.requested_size(),
361 /* frontier */ nullptr, "HEAP", kIndirectlyLeaked);
362 }
363}
364
365// ForEachChunk callback. If chunk is marked as ignored, adds its address to
366// frontier.
367static void CollectIgnoredCb(uptr chunk, void *arg) {
368 CHECK(arg)do { __sanitizer::u64 v1 = (__sanitizer::u64)((arg)); __sanitizer
::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect(!!(!(v1
!= v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 368, "(" "(arg)" ") " "!=" " (" "0" ")", v1, v2); } while (
false);
369 chunk = GetUserBegin(chunk);
370 LsanMetadata m(chunk);
371 if (m.allocated() && m.tag() == kIgnored) {
372 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)
373 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);
374 reinterpret_cast<Frontier *>(arg)->push_back(chunk);
375 }
376}
377
378static uptr GetCallerPC(u32 stack_id, StackDepotReverseMap *map) {
379 CHECK(stack_id)do { __sanitizer::u64 v1 = (__sanitizer::u64)((stack_id)); __sanitizer
::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect(!!(!(v1
!= v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 379, "(" "(stack_id)" ") " "!=" " (" "0" ")", v1, v2); } while
(false);
380 StackTrace stack = map->Get(stack_id);
381 // The top frame is our malloc/calloc/etc. The next frame is the caller.
382 if (stack.size >= 2)
383 return stack.trace[1];
384 return 0;
385}
386
387struct InvalidPCParam {
388 Frontier *frontier;
389 StackDepotReverseMap *stack_depot_reverse_map;
390 bool skip_linker_allocations;
391};
392
393// ForEachChunk callback. If the caller pc is invalid or is within the linker,
394// mark as reachable. Called by ProcessPlatformSpecificAllocations.
395static void MarkInvalidPCCb(uptr chunk, void *arg) {
396 CHECK(arg)do { __sanitizer::u64 v1 = (__sanitizer::u64)((arg)); __sanitizer
::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect(!!(!(v1
!= v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 396, "(" "(arg)" ") " "!=" " (" "0" ")", v1, v2); } while (
false);
397 InvalidPCParam *param = reinterpret_cast<InvalidPCParam *>(arg);
398 chunk = GetUserBegin(chunk);
399 LsanMetadata m(chunk);
400 if (m.allocated() && m.tag() != kReachable && m.tag() != kIgnored) {
401 u32 stack_id = m.stack_trace_id();
402 uptr caller_pc = 0;
403 if (stack_id > 0)
404 caller_pc = GetCallerPC(stack_id, param->stack_depot_reverse_map);
405 // If caller_pc is unknown, this chunk may be allocated in a coroutine. Mark
406 // it as reachable, as we can't properly report its allocation stack anyway.
407 if (caller_pc == 0 || (param->skip_linker_allocations &&
408 GetLinker()->containsAddress(caller_pc))) {
409 m.set_tag(kReachable);
410 param->frontier->push_back(chunk);
411 }
412 }
413}
414
415// On Linux, treats all chunks allocated from ld-linux.so as reachable, which
416// covers dynamically allocated TLS blocks, internal dynamic loader's loaded
417// modules accounting etc.
418// Dynamic TLS blocks contain the TLS variables of dynamically loaded modules.
419// They are allocated with a __libc_memalign() call in allocate_and_init()
420// (elf/dl-tls.c). Glibc won't tell us the address ranges occupied by those
421// blocks, but we can make sure they come from our own allocator by intercepting
422// __libc_memalign(). On top of that, there is no easy way to reach them. Their
423// addresses are stored in a dynamically allocated array (the DTV) which is
424// referenced from the static TLS. Unfortunately, we can't just rely on the DTV
425// being reachable from the static TLS, and the dynamic TLS being reachable from
426// the DTV. This is because the initial DTV is allocated before our interception
427// mechanism kicks in, and thus we don't recognize it as allocated memory. We
428// can't special-case it either, since we don't know its size.
429// Our solution is to include in the root set all allocations made from
430// ld-linux.so (which is where allocate_and_init() is implemented). This is
431// guaranteed to include all dynamic TLS blocks (and possibly other allocations
432// which we don't care about).
433// On all other platforms, this simply checks to ensure that the caller pc is
434// valid before reporting chunks as leaked.
435void ProcessPC(Frontier *frontier) {
436 StackDepotReverseMap stack_depot_reverse_map;
437 InvalidPCParam arg;
438 arg.frontier = frontier;
439 arg.stack_depot_reverse_map = &stack_depot_reverse_map;
440 arg.skip_linker_allocations =
441 flags()->use_tls && flags()->use_ld_allocations && GetLinker() != nullptr;
442 ForEachChunk(MarkInvalidPCCb, &arg);
443}
444
445// Sets the appropriate tag on each chunk.
446static void ClassifyAllChunks(SuspendedThreadsList const &suspended_threads) {
447 // Holds the flood fill frontier.
448 Frontier frontier;
449
450 ForEachChunk(CollectIgnoredCb, &frontier);
451 ProcessGlobalRegions(&frontier);
452 ProcessThreads(suspended_threads, &frontier);
453 ProcessRootRegions(&frontier);
454 FloodFillTag(&frontier, kReachable);
455
456 CHECK_EQ(0, frontier.size())do { __sanitizer::u64 v1 = (__sanitizer::u64)((0)); __sanitizer
::u64 v2 = (__sanitizer::u64)((frontier.size())); if (__builtin_expect
(!!(!(v1 == v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 456, "(" "(0)" ") " "==" " (" "(frontier.size())" ")", v1, v2
); } while (false);
457 ProcessPC(&frontier);
458
459 // The check here is relatively expensive, so we do this in a separate flood
460 // fill. That way we can skip the check for chunks that are reachable
461 // otherwise.
462 LOG_POINTERS("Processing platform-specific allocations.\n")do { if (flags()->log_pointers) Report("Processing platform-specific allocations.\n"
); } while (0);
463 ProcessPlatformSpecificAllocations(&frontier);
464 FloodFillTag(&frontier, kReachable);
465
466 // Iterate over leaked chunks and mark those that are reachable from other
467 // leaked chunks.
468 LOG_POINTERS("Scanning leaked chunks.\n")do { if (flags()->log_pointers) Report("Scanning leaked chunks.\n"
); } while (0);
469 ForEachChunk(MarkIndirectlyLeakedCb, nullptr);
470}
471
472// ForEachChunk callback. Resets the tags to pre-leak-check state.
473static void ResetTagsCb(uptr chunk, void *arg) {
474 (void)arg;
475 chunk = GetUserBegin(chunk);
476 LsanMetadata m(chunk);
477 if (m.allocated() && m.tag() != kIgnored)
478 m.set_tag(kDirectlyLeaked);
479}
480
481static void PrintStackTraceById(u32 stack_trace_id) {
482 CHECK(stack_trace_id)do { __sanitizer::u64 v1 = (__sanitizer::u64)((stack_trace_id
)); __sanitizer::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 482, "(" "(stack_trace_id)" ") " "!=" " (" "0" ")", v1, v2)
; } while (false);
483 StackDepotGet(stack_trace_id).Print();
484}
485
486// ForEachChunk callback. Aggregates information about unreachable chunks into
487// a LeakReport.
488static void CollectLeaksCb(uptr chunk, void *arg) {
489 CHECK(arg)do { __sanitizer::u64 v1 = (__sanitizer::u64)((arg)); __sanitizer
::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect(!!(!(v1
!= v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 489, "(" "(arg)" ") " "!=" " (" "0" ")", v1, v2); } while (
false);
490 LeakReport *leak_report = reinterpret_cast<LeakReport *>(arg);
491 chunk = GetUserBegin(chunk);
492 LsanMetadata m(chunk);
493 if (!m.allocated()) return;
494 if (m.tag() == kDirectlyLeaked || m.tag() == kIndirectlyLeaked) {
495 u32 resolution = flags()->resolution;
496 u32 stack_trace_id = 0;
497 if (resolution > 0) {
498 StackTrace stack = StackDepotGet(m.stack_trace_id());
499 stack.size = Min(stack.size, resolution);
500 stack_trace_id = StackDepotPut(stack);
501 } else {
502 stack_trace_id = m.stack_trace_id();
503 }
504 leak_report->AddLeakedChunk(chunk, stack_trace_id, m.requested_size(),
505 m.tag());
506 }
507}
508
509static void PrintMatchedSuppressions() {
510 InternalMmapVector<Suppression *> matched;
511 GetSuppressionContext()->GetMatched(&matched);
512 if (!matched.size())
513 return;
514 const char *line = "-----------------------------------------------------";
515 Printf("%s\n", line);
516 Printf("Suppressions used:\n");
517 Printf(" count bytes template\n");
518 for (uptr i = 0; i < matched.size(); i++)
519 Printf("%7zu %10zu %s\n", static_cast<uptr>(atomic_load_relaxed(
520 &matched[i]->hit_count)), matched[i]->weight, matched[i]->templ);
521 Printf("%s\n\n", line);
522}
523
524struct CheckForLeaksParam {
525 bool success;
526 LeakReport leak_report;
527};
528
529static void ReportIfNotSuspended(ThreadContextBase *tctx, void *arg) {
530 const InternalMmapVector<tid_t> &suspended_threads =
531 *(const InternalMmapVector<tid_t> *)arg;
532 if (tctx->status == ThreadStatusRunning) {
533 uptr i = InternalLowerBound(suspended_threads, 0, suspended_threads.size(),
534 tctx->os_id, CompareLess<int>());
535 if (i >= suspended_threads.size() || suspended_threads[i] != tctx->os_id)
536 Report("Running thread %d was not suspended. False leaks are possible.\n",
537 tctx->os_id);
538 };
539}
540
541static void ReportUnsuspendedThreads(
542 const SuspendedThreadsList &suspended_threads) {
543 InternalMmapVector<tid_t> threads(suspended_threads.ThreadCount());
544 for (uptr i = 0; i < suspended_threads.ThreadCount(); ++i)
545 threads[i] = suspended_threads.GetThreadID(i);
546
547 Sort(threads.data(), threads.size());
548
549 GetThreadRegistryLocked()->RunCallbackForEachThreadLocked(
550 &ReportIfNotSuspended, &threads);
551}
552
553static void CheckForLeaksCallback(const SuspendedThreadsList &suspended_threads,
554 void *arg) {
555 CheckForLeaksParam *param = reinterpret_cast<CheckForLeaksParam *>(arg);
556 CHECK(param)do { __sanitizer::u64 v1 = (__sanitizer::u64)((param)); __sanitizer
::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect(!!(!(v1
!= v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 556, "(" "(param)" ") " "!=" " (" "0" ")", v1, v2); } while
(false);
557 CHECK(!param->success)do { __sanitizer::u64 v1 = (__sanitizer::u64)((!param->success
)); __sanitizer::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 557, "(" "(!param->success)" ") " "!=" " (" "0" ")", v1,
v2); } while (false);
558 ReportUnsuspendedThreads(suspended_threads);
559 ClassifyAllChunks(suspended_threads);
560 ForEachChunk(CollectLeaksCb, &param->leak_report);
561 // Clean up for subsequent leak checks. This assumes we did not overwrite any
562 // kIgnored tags.
563 ForEachChunk(ResetTagsCb, nullptr);
564 param->success = true;
565}
566
567static bool CheckForLeaks() {
568 if (&__lsan_is_turned_off && __lsan_is_turned_off())
569 return false;
570 EnsureMainThreadIDIsCorrect();
571 CheckForLeaksParam param;
572 param.success = false;
573 LockThreadRegistry();
574 LockAllocator();
575 DoStopTheWorld(CheckForLeaksCallback, &param);
576 UnlockAllocator();
577 UnlockThreadRegistry();
578
579 if (!param.success) {
580 Report("LeakSanitizer has encountered a fatal error.\n");
581 Report(
582 "HINT: For debugging, try setting environment variable "
583 "LSAN_OPTIONS=verbosity=1:log_threads=1\n");
584 Report(
585 "HINT: LeakSanitizer does not work under ptrace (strace, gdb, etc)\n");
586 Die();
587 }
588 param.leak_report.ApplySuppressions();
589 uptr unsuppressed_count = param.leak_report.UnsuppressedLeakCount();
590 if (unsuppressed_count > 0) {
591 Decorator d;
592 Printf("\n"
593 "================================================================="
594 "\n");
595 Printf("%s", d.Error());
596 Report("ERROR: LeakSanitizer: detected memory leaks\n");
597 Printf("%s", d.Default());
598 param.leak_report.ReportTopLeaks(flags()->max_leaks);
599 }
600 if (common_flags()->print_suppressions)
601 PrintMatchedSuppressions();
602 if (unsuppressed_count > 0) {
603 param.leak_report.PrintSummary();
604 return true;
605 }
606 return false;
607}
608
609static bool has_reported_leaks = false;
610bool HasReportedLeaks() { return has_reported_leaks; }
611
612void DoLeakCheck() {
613 BlockingMutexLock l(&global_mutex);
614 static bool already_done;
615 if (already_done) return;
616 already_done = true;
617 has_reported_leaks = CheckForLeaks();
618 if (has_reported_leaks) HandleLeaks();
619}
620
621static int DoRecoverableLeakCheck() {
622 BlockingMutexLock l(&global_mutex);
623 bool have_leaks = CheckForLeaks();
624 return have_leaks ? 1 : 0;
625}
626
627void DoRecoverableLeakCheckVoid() { DoRecoverableLeakCheck(); }
628
629static Suppression *GetSuppressionForAddr(uptr addr) {
630 Suppression *s = nullptr;
631
632 // Suppress by module name.
633 SuppressionContext *suppressions = GetSuppressionContext();
634 if (const char *module_name =
1
Taking false branch
→
635 Symbolizer::GetOrInit()->GetModuleNameForPc(addr))
636 if (suppressions->Match(module_name, kSuppressionLeak, &s))
637 return s;
638
639 // Suppress by file or function name.
640 SymbolizedStack *frames = Symbolizer::GetOrInit()->SymbolizePC(addr);
2
←
'frames' initialized here
→
641 for (SymbolizedStack *cur = frames; cur; cur = cur->next) {
3
←
Assuming pointer value is null
→
4
←
Loop condition is false. Execution continues on line 647
→
642 if (suppressions->Match(cur->info.function, kSuppressionLeak, &s) ||
643 suppressions->Match(cur->info.file, kSuppressionLeak, &s)) {
644 break;
645 }
646 }
647 frames->ClearAll();
5
←
Called C++ object pointer is null
648 return s;
649}
650
651static Suppression *GetSuppressionForStack(u32 stack_trace_id) {
652 StackTrace stack = StackDepotGet(stack_trace_id);
653 for (uptr i = 0; i < stack.size; i++) {
654 Suppression *s = GetSuppressionForAddr(
655 StackTrace::GetPreviousInstructionPc(stack.trace[i]));
656 if (s) return s;
657 }
658 return nullptr;
659}
660
661///// LeakReport implementation. /////
662
663// A hard limit on the number of distinct leaks, to avoid quadratic complexity
664// in LeakReport::AddLeakedChunk(). We don't expect to ever see this many leaks
665// in real-world applications.
666// FIXME: Get rid of this limit by changing the implementation of LeakReport to
667// use a hash table.
668const uptr kMaxLeaksConsidered = 5000;
669
670void LeakReport::AddLeakedChunk(uptr chunk, u32 stack_trace_id,
671 uptr leaked_size, ChunkTag tag) {
672 CHECK(tag == kDirectlyLeaked || tag == kIndirectlyLeaked)do { __sanitizer::u64 v1 = (__sanitizer::u64)((tag == kDirectlyLeaked
|| tag == kIndirectlyLeaked)); __sanitizer::u64 v2 = (__sanitizer
::u64)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer
::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 672, "(" "(tag == kDirectlyLeaked || tag == kIndirectlyLeaked)"
") " "!=" " (" "0" ")", v1, v2); } while (false);
673 bool is_directly_leaked = (tag == kDirectlyLeaked);
674 uptr i;
675 for (i = 0; i < leaks_.size(); i++) {
676 if (leaks_[i].stack_trace_id == stack_trace_id &&
677 leaks_[i].is_directly_leaked == is_directly_leaked) {
678 leaks_[i].hit_count++;
679 leaks_[i].total_size += leaked_size;
680 break;
681 }
682 }
683 if (i == leaks_.size()) {
684 if (leaks_.size() == kMaxLeaksConsidered) return;
685 Leak leak = { next_id_++, /* hit_count */ 1, leaked_size, stack_trace_id,
686 is_directly_leaked, /* is_suppressed */ false };
687 leaks_.push_back(leak);
688 }
689 if (flags()->report_objects) {
690 LeakedObject obj = {leaks_[i].id, chunk, leaked_size};
691 leaked_objects_.push_back(obj);
692 }
693}
694
695static bool LeakComparator(const Leak &leak1, const Leak &leak2) {
696 if (leak1.is_directly_leaked == leak2.is_directly_leaked)
697 return leak1.total_size > leak2.total_size;
698 else
699 return leak1.is_directly_leaked;
700}
701
702void LeakReport::ReportTopLeaks(uptr num_leaks_to_report) {
703 CHECK(leaks_.size() <= kMaxLeaksConsidered)do { __sanitizer::u64 v1 = (__sanitizer::u64)((leaks_.size() <=
kMaxLeaksConsidered)); __sanitizer::u64 v2 = (__sanitizer::u64
)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer::
CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 703, "(" "(leaks_.size() <= kMaxLeaksConsidered)" ") " "!="
" (" "0" ")", v1, v2); } while (false);
704 Printf("\n");
705 if (leaks_.size() == kMaxLeaksConsidered)
706 Printf("Too many leaks! Only the first %zu leaks encountered will be "
707 "reported.\n",
708 kMaxLeaksConsidered);
709
710 uptr unsuppressed_count = UnsuppressedLeakCount();
711 if (num_leaks_to_report > 0 && num_leaks_to_report < unsuppressed_count)
712 Printf("The %zu top leak(s):\n", num_leaks_to_report);
713 Sort(leaks_.data(), leaks_.size(), &LeakComparator);
714 uptr leaks_reported = 0;
715 for (uptr i = 0; i < leaks_.size(); i++) {
716 if (leaks_[i].is_suppressed) continue;
717 PrintReportForLeak(i);
718 leaks_reported++;
719 if (leaks_reported == num_leaks_to_report) break;
720 }
721 if (leaks_reported < unsuppressed_count) {
722 uptr remaining = unsuppressed_count - leaks_reported;
723 Printf("Omitting %zu more leak(s).\n", remaining);
724 }
725}
726
727void LeakReport::PrintReportForLeak(uptr index) {
728 Decorator d;
729 Printf("%s", d.Leak());
730 Printf("%s leak of %zu byte(s) in %zu object(s) allocated from:\n",
731 leaks_[index].is_directly_leaked ? "Direct" : "Indirect",
732 leaks_[index].total_size, leaks_[index].hit_count);
733 Printf("%s", d.Default());
734
735 PrintStackTraceById(leaks_[index].stack_trace_id);
736
737 if (flags()->report_objects) {
738 Printf("Objects leaked above:\n");
739 PrintLeakedObjectsForLeak(index);
740 Printf("\n");
741 }
742}
743
744void LeakReport::PrintLeakedObjectsForLeak(uptr index) {
745 u32 leak_id = leaks_[index].id;
746 for (uptr j = 0; j < leaked_objects_.size(); j++) {
747 if (leaked_objects_[j].leak_id == leak_id)
748 Printf("%p (%zu bytes)\n", leaked_objects_[j].addr,
749 leaked_objects_[j].size);
750 }
751}
752
753void LeakReport::PrintSummary() {
754 CHECK(leaks_.size() <= kMaxLeaksConsidered)do { __sanitizer::u64 v1 = (__sanitizer::u64)((leaks_.size() <=
kMaxLeaksConsidered)); __sanitizer::u64 v2 = (__sanitizer::u64
)(0); if (__builtin_expect(!!(!(v1 != v2)), 0)) __sanitizer::
CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 754, "(" "(leaks_.size() <= kMaxLeaksConsidered)" ") " "!="
" (" "0" ")", v1, v2); } while (false);
755 uptr bytes = 0, allocations = 0;
756 for (uptr i = 0; i < leaks_.size(); i++) {
757 if (leaks_[i].is_suppressed) continue;
758 bytes += leaks_[i].total_size;
759 allocations += leaks_[i].hit_count;
760 }
761 InternalScopedString summary(kMaxSummaryLength);
762 summary.append("%zu byte(s) leaked in %zu allocation(s).", bytes,
763 allocations);
764 ReportErrorSummary(summary.data());
765}
766
767void LeakReport::ApplySuppressions() {
768 for (uptr i = 0; i < leaks_.size(); i++) {
769 Suppression *s = GetSuppressionForStack(leaks_[i].stack_trace_id);
770 if (s) {
771 s->weight += leaks_[i].total_size;
772 atomic_store_relaxed(&s->hit_count, atomic_load_relaxed(&s->hit_count) +
773 leaks_[i].hit_count);
774 leaks_[i].is_suppressed = true;
775 }
776 }
777}
778
779uptr LeakReport::UnsuppressedLeakCount() {
780 uptr result = 0;
781 for (uptr i = 0; i < leaks_.size(); i++)
782 if (!leaks_[i].is_suppressed) result++;
783 return result;
784}
785
786} // namespace __lsan
787#else // CAN_SANITIZE_LEAKS
788namespace __lsan {
789void InitCommonLsan() { }
790void DoLeakCheck() { }
791void DoRecoverableLeakCheckVoid() { }
792void DisableInThisThread() { }
793void EnableInThisThread() { }
794}
795#endif // CAN_SANITIZE_LEAKS
796
797using namespace __lsan; // NOLINT
798
799extern "C" {
800SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default")))
801void __lsan_ignore_object(const void *p) {
802#if CAN_SANITIZE_LEAKS1
803 if (!common_flags()->detect_leaks)
804 return;
805 // Cannot use PointsIntoChunk or LsanMetadata here, since the allocator is not
806 // locked.
807 BlockingMutexLock l(&global_mutex);
808 IgnoreObjectResult res = IgnoreObjectLocked(p);
809 if (res == kIgnoreObjectInvalid)
810 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);
811 if (res == kIgnoreObjectAlreadyIgnored)
812 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)
813 "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);
814 if (res == kIgnoreObjectSuccess)
815 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);
816#endif // CAN_SANITIZE_LEAKS
817}
818
819SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default")))
820void __lsan_register_root_region(const void *begin, uptr size) {
821#if CAN_SANITIZE_LEAKS1
822 BlockingMutexLock l(&global_mutex);
823 CHECK(root_regions)do { __sanitizer::u64 v1 = (__sanitizer::u64)((root_regions))
; __sanitizer::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 823, "(" "(root_regions)" ") " "!=" " (" "0" ")", v1, v2); }
while (false);
824 RootRegion region = {reinterpret_cast<uptr>(begin), size};
825 root_regions->push_back(region);
826 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);
827#endif // CAN_SANITIZE_LEAKS
828}
829
830SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default")))
831void __lsan_unregister_root_region(const void *begin, uptr size) {
832#if CAN_SANITIZE_LEAKS1
833 BlockingMutexLock l(&global_mutex);
834 CHECK(root_regions)do { __sanitizer::u64 v1 = (__sanitizer::u64)((root_regions))
; __sanitizer::u64 v2 = (__sanitizer::u64)(0); if (__builtin_expect
(!!(!(v1 != v2)), 0)) __sanitizer::CheckFailed("/build/llvm-toolchain-snapshot-9~svn362543/projects/compiler-rt/lib/lsan/lsan_common.cc"
, 834, "(" "(root_regions)" ") " "!=" " (" "0" ")", v1, v2); }
while (false);
835 bool removed = false;
836 for (uptr i = 0; i < root_regions->size(); i++) {
837 RootRegion region = (*root_regions)[i];
838 if (region.begin == reinterpret_cast<uptr>(begin) && region.size == size) {
839 removed = true;
840 uptr last_index = root_regions->size() - 1;
841 (*root_regions)[i] = (*root_regions)[last_index];
842 root_regions->pop_back();
843 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);
844 break;
845 }
846 }
847 if (!removed) {
848 Report(
849 "__lsan_unregister_root_region(): region at %p of size %llu has not "
850 "been registered.\n",
851 begin, size);
852 Die();
853 }
854#endif // CAN_SANITIZE_LEAKS
855}
856
857SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default")))
858void __lsan_disable() {
859#if CAN_SANITIZE_LEAKS1
860 __lsan::DisableInThisThread();
861#endif
862}
863
864SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default")))
865void __lsan_enable() {
866#if CAN_SANITIZE_LEAKS1
867 __lsan::EnableInThisThread();
868#endif
869}
870
871SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default")))
872void __lsan_do_leak_check() {
873#if CAN_SANITIZE_LEAKS1
874 if (common_flags()->detect_leaks)
875 __lsan::DoLeakCheck();
876#endif // CAN_SANITIZE_LEAKS
877}
878
879SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default")))
880int __lsan_do_recoverable_leak_check() {
881#if CAN_SANITIZE_LEAKS1
882 if (common_flags()->detect_leaks)
883 return __lsan::DoRecoverableLeakCheck();
884#endif // CAN_SANITIZE_LEAKS
885 return 0;
886}
887
888#if !SANITIZER_SUPPORTS_WEAK_HOOKS1
889SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default"))) SANITIZER_WEAK_ATTRIBUTE__attribute__((weak))
890const char * __lsan_default_options() {
891 return "";
892}
893
894SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default"))) SANITIZER_WEAK_ATTRIBUTE__attribute__((weak))
895int __lsan_is_turned_off() {
896 return 0;
897}
898
899SANITIZER_INTERFACE_ATTRIBUTE__attribute__((visibility("default"))) SANITIZER_WEAK_ATTRIBUTE__attribute__((weak))
900const char *__lsan_default_suppressions() {
901 return "";
902}
903#endif
904} // extern "C"