tsan: always subtract one from program counters

Go has a pending change to pass proper PCs to tsan:
https://go-review.googlesource.com/#/c/4902/
So now we can always subtract one from PCs.

llvm-svn: 229262

1 files changed, 0 insertions, 6 deletions

diff --git a/compiler-rt/lib/tsan/rtl/tsan_rtl_report.cc b/compiler-rt/lib/tsan/rtl/tsan_rtl_report.cc
index d1621454242..dc9438e6371 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_rtl_report.cc
+++ b/compiler-rt/lib/tsan/rtl/tsan_rtl_report.cc
@@ -112,16 +112,10 @@ static ReportStack *SymbolizeStack(StackTrace trace) {
   for (uptr si = 0; si < trace.size; si++) {
     const uptr pc = trace.trace[si];
     uptr pc1 = pc;
-#ifndef SANITIZER_GO
     // We obtain the return address, but we're interested in the previous
     // instruction.
     if ((pc & kExternalPCBit) == 0)
       pc1 = StackTrace::GetPreviousInstructionPc(pc);
-#else
-    // FIXME(dvyukov): Go sometimes uses address of a function as top pc.
-    if (si != trace.size - 1)
-      pc1 -= 1;
-#endif
     SymbolizedStack *ent = SymbolizeCode(pc1);
     CHECK_NE(ent, 0);
     SymbolizedStack *last = ent;