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//===-- tsan_suppressions.cc ----------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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"
// 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.
#ifndef TSAN_GO
extern "C" const char *WEAK __tsan_default_suppressions() {
return 0;
}
#endif
namespace __tsan {
static SuppressionContext* g_ctx;
static char *ReadFile(const char *filename) {
if (filename == 0 || filename[0] == 0)
return 0;
InternalScopedBuffer<char> tmp(4*1024);
if (filename[0] == '/' || GetPwd() == 0)
internal_snprintf(tmp.data(), tmp.size(), "%s", filename);
else
internal_snprintf(tmp.data(), tmp.size(), "%s/%s", GetPwd(), filename);
uptr openrv = OpenFile(tmp.data(), false);
if (internal_iserror(openrv)) {
Printf("ThreadSanitizer: failed to open suppressions file '%s'\n",
tmp.data());
Die();
}
fd_t fd = openrv;
const uptr fsize = internal_filesize(fd);
if (fsize == (uptr)-1) {
Printf("ThreadSanitizer: failed to stat suppressions file '%s'\n",
tmp.data());
Die();
}
char *buf = (char*)internal_alloc(MBlockSuppression, fsize + 1);
if (fsize != internal_read(fd, buf, fsize)) {
Printf("ThreadSanitizer: failed to read suppressions file '%s'\n",
tmp.data());
Die();
}
internal_close(fd);
buf[fsize] = 0;
return buf;
}
void InitializeSuppressions() {
ALIGNED(64) static char placeholder_[sizeof(SuppressionContext)];
g_ctx = new(placeholder_) SuppressionContext;
const char *supp = ReadFile(flags()->suppressions);
g_ctx->Parse(supp);
#ifndef TSAN_GO
supp = __tsan_default_suppressions();
g_ctx->Parse(supp);
g_ctx->Parse(std_suppressions);
#endif
}
SuppressionContext *GetSuppressionContext() {
CHECK_NE(g_ctx, 0);
return g_ctx;
}
SuppressionType conv(ReportType typ) {
if (typ == ReportTypeRace)
return SuppressionRace;
else if (typ == ReportTypeVptrRace)
return SuppressionRace;
else if (typ == ReportTypeUseAfterFree)
return SuppressionRace;
else if (typ == ReportTypeThreadLeak)
return SuppressionThread;
else if (typ == ReportTypeMutexDestroyLocked)
return SuppressionMutex;
else if (typ == ReportTypeMutexDoubleLock)
return SuppressionMutex;
else if (typ == ReportTypeMutexBadUnlock)
return SuppressionMutex;
else if (typ == ReportTypeMutexBadReadLock)
return SuppressionMutex;
else if (typ == ReportTypeMutexBadReadUnlock)
return SuppressionMutex;
else if (typ == ReportTypeSignalUnsafe)
return SuppressionSignal;
else if (typ == ReportTypeErrnoInSignal)
return SuppressionNone;
else if (typ == ReportTypeDeadlock)
return SuppressionDeadlock;
Printf("ThreadSanitizer: unknown report type %d\n", typ),
Die();
}
uptr IsSuppressed(ReportType typ, const ReportStack *stack, Suppression **sp) {
CHECK(g_ctx);
if (!g_ctx->SuppressionCount() || stack == 0) return 0;
SuppressionType stype = conv(typ);
if (stype == SuppressionNone)
return 0;
Suppression *s;
for (const ReportStack *frame = stack; frame; frame = frame->next) {
if (g_ctx->Match(frame->func, stype, &s) ||
g_ctx->Match(frame->file, stype, &s) ||
g_ctx->Match(frame->module, stype, &s)) {
DPrintf("ThreadSanitizer: matched suppression '%s'\n", s->templ);
s->hit_count++;
*sp = s;
return frame->pc;
}
}
return 0;
}
uptr IsSuppressed(ReportType typ, const ReportLocation *loc, Suppression **sp) {
CHECK(g_ctx);
if (!g_ctx->SuppressionCount() || loc == 0 ||
loc->type != ReportLocationGlobal)
return 0;
SuppressionType stype = conv(typ);
if (stype == SuppressionNone)
return 0;
Suppression *s;
if (g_ctx->Match(loc->name, stype, &s) ||
g_ctx->Match(loc->file, stype, &s) ||
g_ctx->Match(loc->module, stype, &s)) {
DPrintf("ThreadSanitizer: matched suppression '%s'\n", s->templ);
s->hit_count++;
*sp = s;
return loc->addr;
}
return 0;
}
void PrintMatchedSuppressions() {
CHECK(g_ctx);
InternalMmapVector<Suppression *> matched(1);
g_ctx->GetMatched(&matched);
if (!matched.size())
return;
int hit_count = 0;
for (uptr i = 0; i < matched.size(); i++)
hit_count += 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", matched[i]->hit_count,
SuppressionTypeString(matched[i]->type), matched[i]->templ);
}
}
} // namespace __tsan
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