1 files changed, 22 insertions, 14 deletions

diff --git a/lib/tsan/rtl/tsan_suppressions.cc b/lib/tsan/rtl/tsan_suppressions.cc
index 5413f04af1d2..e382f21f0dff 100644
--- a/lib/tsan/rtl/tsan_suppressions.cc
+++ b/lib/tsan/rtl/tsan_suppressions.cc
@@ -21,6 +21,7 @@
 #include "tsan_mman.h"
 #include "tsan_platform.h"
 
+#ifndef 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.
@@ -33,7 +34,6 @@ static const char *const std_suppressions =
 "race:std::_Sp_counted_ptr_inplace<std::thread::_Impl\n";
 
 // Can be overriden in frontend.
-#ifndef SANITIZER_GO
 extern "C" const char *WEAK __tsan_default_suppressions() {
   return 0;
 }
@@ -44,8 +44,9 @@ namespace __tsan {
 ALIGNED(64) static char suppression_placeholder[sizeof(SuppressionContext)];
 static SuppressionContext *suppression_ctx = nullptr;
 static const char *kSuppressionTypes[] = {
-    kSuppressionRace,   kSuppressionMutex, kSuppressionThread,
-    kSuppressionSignal, kSuppressionLib,   kSuppressionDeadlock};
+    kSuppressionRace,   kSuppressionRaceTop, kSuppressionMutex,
+    kSuppressionThread, kSuppressionSignal, kSuppressionLib,
+    kSuppressionDeadlock};
 
 void InitializeSuppressions() {
   CHECK_EQ(nullptr, suppression_ctx);
@@ -94,6 +95,18 @@ static const char *conv(ReportType typ) {
   Die();
 }
 
+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)) {
+    DPrintf("ThreadSanitizer: matched suppression '%s'\n", (*sp)->templ);
+    (*sp)->hit_count++;
+    return info.address;
+  }
+  return 0;
+}
+
 uptr IsSuppressed(ReportType typ, const ReportStack *stack, Suppression **sp) {
   CHECK(suppression_ctx);
   if (!suppression_ctx->SuppressionCount() || stack == 0 ||
@@ -102,19 +115,14 @@ uptr IsSuppressed(ReportType typ, const ReportStack *stack, Suppression **sp) {
   const char *stype = conv(typ);
   if (0 == internal_strcmp(stype, kSuppressionNone))
     return 0;
-  Suppression *s;
   for (const SymbolizedStack *frame = stack->frames; frame;
-       frame = frame->next) {
-    const AddressInfo &info = frame->info;
-    if (suppression_ctx->Match(info.function, stype, &s) ||
-        suppression_ctx->Match(info.file, stype, &s) ||
-        suppression_ctx->Match(info.module, stype, &s)) {
-      DPrintf("ThreadSanitizer: matched suppression '%s'\n", s->templ);
-      s->hit_count++;
-      *sp = s;
-      return info.address;
-    }
+      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;
 }