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