162 lines
5.4 KiB
C++
162 lines
5.4 KiB
C++
//===-- tsan_suppressions.cpp ---------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of ThreadSanitizer (TSan), a race detector.
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//
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_libc.h"
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#include "sanitizer_common/sanitizer_placement_new.h"
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#include "sanitizer_common/sanitizer_suppressions.h"
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#include "tsan_suppressions.h"
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#include "tsan_rtl.h"
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#include "tsan_flags.h"
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#include "tsan_mman.h"
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#include "tsan_platform.h"
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#if !SANITIZER_GO
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// Suppressions for true/false positives in standard libraries.
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static const char *const std_suppressions =
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// Libstdc++ 4.4 has data races in std::string.
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// See http://crbug.com/181502 for an example.
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"race:^_M_rep$\n"
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"race:^_M_is_leaked$\n"
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// False positive when using std <thread>.
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// Happens because we miss atomic synchronization in libstdc++.
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// See http://llvm.org/bugs/show_bug.cgi?id=17066 for details.
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"race:std::_Sp_counted_ptr_inplace<std::thread::_Impl\n";
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// Can be overriden in frontend.
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SANITIZER_WEAK_DEFAULT_IMPL
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const char *__tsan_default_suppressions() {
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return 0;
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}
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#endif
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namespace __tsan {
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ALIGNED(64) static char suppression_placeholder[sizeof(SuppressionContext)];
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static SuppressionContext *suppression_ctx = nullptr;
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static const char *kSuppressionTypes[] = {
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kSuppressionRace, kSuppressionRaceTop, kSuppressionMutex,
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kSuppressionThread, kSuppressionSignal, kSuppressionLib,
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kSuppressionDeadlock};
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void InitializeSuppressions() {
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CHECK_EQ(nullptr, suppression_ctx);
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suppression_ctx = new (suppression_placeholder) // NOLINT
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SuppressionContext(kSuppressionTypes, ARRAY_SIZE(kSuppressionTypes));
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suppression_ctx->ParseFromFile(flags()->suppressions);
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#if !SANITIZER_GO
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suppression_ctx->Parse(__tsan_default_suppressions());
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suppression_ctx->Parse(std_suppressions);
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#endif
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}
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SuppressionContext *Suppressions() {
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CHECK(suppression_ctx);
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return suppression_ctx;
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}
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static const char *conv(ReportType typ) {
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switch (typ) {
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case ReportTypeRace:
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case ReportTypeVptrRace:
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case ReportTypeUseAfterFree:
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case ReportTypeVptrUseAfterFree:
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case ReportTypeExternalRace:
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return kSuppressionRace;
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case ReportTypeThreadLeak:
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return kSuppressionThread;
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case ReportTypeMutexDestroyLocked:
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case ReportTypeMutexDoubleLock:
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case ReportTypeMutexInvalidAccess:
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case ReportTypeMutexBadUnlock:
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case ReportTypeMutexBadReadLock:
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case ReportTypeMutexBadReadUnlock:
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return kSuppressionMutex;
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case ReportTypeSignalUnsafe:
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case ReportTypeErrnoInSignal:
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return kSuppressionSignal;
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case ReportTypeDeadlock:
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return kSuppressionDeadlock;
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// No default case so compiler warns us if we miss one
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}
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UNREACHABLE("missing case");
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}
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static uptr IsSuppressed(const char *stype, const AddressInfo &info,
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Suppression **sp) {
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if (suppression_ctx->Match(info.function, stype, sp) ||
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suppression_ctx->Match(info.file, stype, sp) ||
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suppression_ctx->Match(info.module, stype, sp)) {
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VPrintf(2, "ThreadSanitizer: matched suppression '%s'\n", (*sp)->templ);
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atomic_fetch_add(&(*sp)->hit_count, 1, memory_order_relaxed);
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return info.address;
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}
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return 0;
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}
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uptr IsSuppressed(ReportType typ, const ReportStack *stack, Suppression **sp) {
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CHECK(suppression_ctx);
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if (!suppression_ctx->SuppressionCount() || stack == 0 ||
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!stack->suppressable)
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return 0;
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const char *stype = conv(typ);
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if (0 == internal_strcmp(stype, kSuppressionNone))
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return 0;
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for (const SymbolizedStack *frame = stack->frames; frame;
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frame = frame->next) {
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uptr pc = IsSuppressed(stype, frame->info, sp);
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if (pc != 0)
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return pc;
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}
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if (0 == internal_strcmp(stype, kSuppressionRace) && stack->frames != nullptr)
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return IsSuppressed(kSuppressionRaceTop, stack->frames->info, sp);
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return 0;
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}
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uptr IsSuppressed(ReportType typ, const ReportLocation *loc, Suppression **sp) {
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CHECK(suppression_ctx);
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if (!suppression_ctx->SuppressionCount() || loc == 0 ||
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loc->type != ReportLocationGlobal || !loc->suppressable)
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return 0;
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const char *stype = conv(typ);
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if (0 == internal_strcmp(stype, kSuppressionNone))
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return 0;
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Suppression *s;
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const DataInfo &global = loc->global;
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if (suppression_ctx->Match(global.name, stype, &s) ||
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suppression_ctx->Match(global.module, stype, &s)) {
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VPrintf(2, "ThreadSanitizer: matched suppression '%s'\n", s->templ);
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atomic_fetch_add(&s->hit_count, 1, memory_order_relaxed);
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*sp = s;
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return global.start;
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}
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return 0;
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}
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void PrintMatchedSuppressions() {
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InternalMmapVector<Suppression *> matched;
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CHECK(suppression_ctx);
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suppression_ctx->GetMatched(&matched);
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if (!matched.size())
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return;
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int hit_count = 0;
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for (uptr i = 0; i < matched.size(); i++)
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hit_count += atomic_load_relaxed(&matched[i]->hit_count);
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Printf("ThreadSanitizer: Matched %d suppressions (pid=%d):\n", hit_count,
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(int)internal_getpid());
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for (uptr i = 0; i < matched.size(); i++) {
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Printf("%d %s:%s\n", atomic_load_relaxed(&matched[i]->hit_count),
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matched[i]->type, matched[i]->templ);
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}
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}
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} // namespace __tsan
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