tsan: use stack depot for goroutine creation stacks (as C++ threads do)

llvm-svn: 204326

compiler-rt/lib/tsan/rtl/tsan_rtl.h

@@ -485,11 +485,7 @@ class ThreadContext : public ThreadContextBase {
   explicit ThreadContext(int tid);
   ~ThreadContext();
   ThreadState *thr;
-#ifdef TSAN_GO
-  StackTrace creation_stack;
-#else
   u32 creation_stack_id;
-#endif
   SyncClock sync;
   // Epoch at which the thread had started.
   // If we see an event from the thread stamped by an older epoch,

compiler-rt/lib/tsan/rtl/tsan_rtl_report.cc

@@ -104,8 +104,9 @@ static void StackStripMain(ReportStack *stack) {
 #endif
 }
 
-#ifndef TSAN_GO
 ReportStack *SymbolizeStackId(u32 stack_id) {
+  if (stack_id == 0)
+    return 0;
   uptr ssz = 0;
   const uptr *stack = StackDepotGet(stack_id, &ssz);
   if (stack == 0)
@@ -114,7 +115,6 @@ ReportStack *SymbolizeStackId(u32 stack_id) {
   trace.Init(stack, ssz);
   return SymbolizeStack(trace);
 }
-#endif
 
 static ReportStack *SymbolizeStack(const StackTrace& trace) {
   if (trace.IsEmpty())
@@ -201,11 +201,7 @@ void ScopedReport::AddThread(const ThreadContext *tctx) {
   rt->name = internal_strdup(tctx->name);
   rt->parent_tid = tctx->parent_tid;
   rt->stack = 0;
-#ifdef TSAN_GO
-  rt->stack = SymbolizeStack(tctx->creation_stack);
-#else
   rt->stack = SymbolizeStackId(tctx->creation_stack_id);
-#endif
 }
 
 #ifndef TSAN_GO
@@ -266,10 +262,7 @@ void ScopedReport::AddMutex(const SyncVar *s) {
   rm->id = s->uid;
   rm->addr = s->addr;
   rm->destroyed = false;
-  rm->stack = 0;
-#ifndef TSAN_GO
   rm->stack = SymbolizeStackId(s->creation_stack_id);
-#endif
 }
 
 u64 ScopedReport::AddMutex(u64 id) {

compiler-rt/lib/tsan/rtl/tsan_rtl_thread.cc

@@ -59,11 +59,7 @@ void ThreadContext::OnCreated(void *arg) {
   // Can't increment epoch w/o writing to the trace as well.
   TraceAddEvent(args->thr, args->thr->fast_state, EventTypeMop, 0);
   ReleaseImpl(args->thr, 0, &sync);
-#ifdef TSAN_GO
-  creation_stack.ObtainCurrent(args->thr, args->pc);
-#else
   creation_stack_id = CurrentStackId(args->thr, args->pc);
-#endif
   if (reuse_count == 0)
     StatInc(args->thr, StatThreadMaxTid);
 }

compiler-rt/lib/tsan/rtl/tsan_sync.cc

@@ -23,6 +23,7 @@ SyncVar::SyncVar(uptr addr, u64 uid)
   : mtx(MutexTypeSyncVar, StatMtxSyncVar)
   , addr(addr)
   , uid(uid)
+  , creation_stack_id()
   , owner_tid(kInvalidTid)
   , last_lock()
   , recursion()
@@ -64,9 +65,9 @@ SyncVar* SyncTab::Create(ThreadState *thr, uptr pc, uptr addr) {
   void *mem = internal_alloc(MBlockSync, sizeof(SyncVar));
   const u64 uid = atomic_fetch_add(&uid_gen_, 1, memory_order_relaxed);
   SyncVar *res = new(mem) SyncVar(addr, uid);
-#ifndef TSAN_GO
-  res->creation_stack_id = CurrentStackId(thr, pc);
-#endif
+  res->creation_stack_id = 0;
+  if (!kGoMode)  // Go does not use them
+    res->creation_stack_id = CurrentStackId(thr, pc);
   if (flags()->detect_deadlocks)
     DDMutexInit(thr, pc, res);
   return res;