1 //===-- tsan_suppressions.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 ThreadSanitizer (TSan), a race detector. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "sanitizer_common/sanitizer_common.h" 15 #include "sanitizer_common/sanitizer_libc.h" 16 #include "sanitizer_common/sanitizer_placement_new.h" 17 #include "sanitizer_common/sanitizer_suppressions.h" 18 #include "tsan_suppressions.h" 19 #include "tsan_rtl.h" 20 #include "tsan_flags.h" 21 #include "tsan_mman.h" 22 #include "tsan_platform.h" 23 24 #ifndef SANITIZER_GO 25 // Suppressions for true/false positives in standard libraries. 26 static const char *const std_suppressions = 27 // Libstdc++ 4.4 has data races in std::string. 28 // See http://crbug.com/181502 for an example. 29 "race:^_M_rep$\n" 30 "race:^_M_is_leaked$\n" 31 // False positive when using std <thread>. 32 // Happens because we miss atomic synchronization in libstdc++. 33 // See http://llvm.org/bugs/show_bug.cgi?id=17066 for details. 34 "race:std::_Sp_counted_ptr_inplace<std::thread::_Impl\n"; 35 36 // Can be overriden in frontend. 37 extern "C" const char *WEAK __tsan_default_suppressions() { 38 return 0; 39 } 40 #endif 41 42 namespace __tsan { 43 44 ALIGNED(64) static char suppression_placeholder[sizeof(SuppressionContext)]; 45 static SuppressionContext *suppression_ctx = nullptr; 46 static const char *kSuppressionTypes[] = { 47 kSuppressionRace, kSuppressionMutex, kSuppressionThread, 48 kSuppressionSignal, kSuppressionLib, kSuppressionDeadlock}; 49 50 void InitializeSuppressions() { 51 CHECK_EQ(nullptr, suppression_ctx); 52 suppression_ctx = new (suppression_placeholder) // NOLINT 53 SuppressionContext(kSuppressionTypes, ARRAY_SIZE(kSuppressionTypes)); 54 suppression_ctx->ParseFromFile(flags()->suppressions); 55 #ifndef SANITIZER_GO 56 suppression_ctx->Parse(__tsan_default_suppressions()); 57 suppression_ctx->Parse(std_suppressions); 58 #endif 59 } 60 61 SuppressionContext *Suppressions() { 62 CHECK(suppression_ctx); 63 return suppression_ctx; 64 } 65 66 static const char *conv(ReportType typ) { 67 if (typ == ReportTypeRace) 68 return kSuppressionRace; 69 else if (typ == ReportTypeVptrRace) 70 return kSuppressionRace; 71 else if (typ == ReportTypeUseAfterFree) 72 return kSuppressionRace; 73 else if (typ == ReportTypeVptrUseAfterFree) 74 return kSuppressionRace; 75 else if (typ == ReportTypeThreadLeak) 76 return kSuppressionThread; 77 else if (typ == ReportTypeMutexDestroyLocked) 78 return kSuppressionMutex; 79 else if (typ == ReportTypeMutexDoubleLock) 80 return kSuppressionMutex; 81 else if (typ == ReportTypeMutexBadUnlock) 82 return kSuppressionMutex; 83 else if (typ == ReportTypeMutexBadReadLock) 84 return kSuppressionMutex; 85 else if (typ == ReportTypeMutexBadReadUnlock) 86 return kSuppressionMutex; 87 else if (typ == ReportTypeSignalUnsafe) 88 return kSuppressionSignal; 89 else if (typ == ReportTypeErrnoInSignal) 90 return kSuppressionNone; 91 else if (typ == ReportTypeDeadlock) 92 return kSuppressionDeadlock; 93 Printf("ThreadSanitizer: unknown report type %d\n", typ), 94 Die(); 95 } 96 97 uptr IsSuppressed(ReportType typ, const ReportStack *stack, Suppression **sp) { 98 CHECK(suppression_ctx); 99 if (!suppression_ctx->SuppressionCount() || stack == 0 || 100 !stack->suppressable) 101 return 0; 102 const char *stype = conv(typ); 103 if (0 == internal_strcmp(stype, kSuppressionNone)) 104 return 0; 105 Suppression *s; 106 for (const SymbolizedStack *frame = stack->frames; frame; 107 frame = frame->next) { 108 const AddressInfo &info = frame->info; 109 if (suppression_ctx->Match(info.function, stype, &s) || 110 suppression_ctx->Match(info.file, stype, &s) || 111 suppression_ctx->Match(info.module, stype, &s)) { 112 DPrintf("ThreadSanitizer: matched suppression '%s'\n", s->templ); 113 s->hit_count++; 114 *sp = s; 115 return info.address; 116 } 117 } 118 return 0; 119 } 120 121 uptr IsSuppressed(ReportType typ, const ReportLocation *loc, Suppression **sp) { 122 CHECK(suppression_ctx); 123 if (!suppression_ctx->SuppressionCount() || loc == 0 || 124 loc->type != ReportLocationGlobal || !loc->suppressable) 125 return 0; 126 const char *stype = conv(typ); 127 if (0 == internal_strcmp(stype, kSuppressionNone)) 128 return 0; 129 Suppression *s; 130 const DataInfo &global = loc->global; 131 if (suppression_ctx->Match(global.name, stype, &s) || 132 suppression_ctx->Match(global.module, stype, &s)) { 133 DPrintf("ThreadSanitizer: matched suppression '%s'\n", s->templ); 134 s->hit_count++; 135 *sp = s; 136 return global.start; 137 } 138 return 0; 139 } 140 141 void PrintMatchedSuppressions() { 142 InternalMmapVector<Suppression *> matched(1); 143 CHECK(suppression_ctx); 144 suppression_ctx->GetMatched(&matched); 145 if (!matched.size()) 146 return; 147 int hit_count = 0; 148 for (uptr i = 0; i < matched.size(); i++) 149 hit_count += matched[i]->hit_count; 150 Printf("ThreadSanitizer: Matched %d suppressions (pid=%d):\n", hit_count, 151 (int)internal_getpid()); 152 for (uptr i = 0; i < matched.size(); i++) { 153 Printf("%d %s:%s\n", matched[i]->hit_count, matched[i]->type, 154 matched[i]->templ); 155 } 156 } 157 } // namespace __tsan 158
