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