tsan: fix windows Go support

Unmap can't unmap arbitrary regions on windows.



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@267716 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/tsan/rtl/tsan_sync.cc b/lib/tsan/rtl/tsan_sync.cc
index c58821aa4..15759d4e0 100644
--- a/lib/tsan/rtl/tsan_sync.cc
+++ b/lib/tsan/rtl/tsan_sync.cc
@@ -120,6 +120,12 @@ bool MetaMap::FreeRange(Processor *proc, uptr p, uptr sz) {
 // without meta objects, at this point it stops freeing meta objects. Because
 // thread stacks grow top-down, we do the same starting from end as well.
 void MetaMap::ResetRange(Processor *proc, uptr p, uptr sz) {
+  if (kGoMode) {
+    // UnmapOrDie/MmapFixedNoReserve does not work on Windows,
+    // so we do the optimization only for C/C++.
+    FreeRange(proc, p, sz);
+    return;
+  }
   const uptr kMetaRatio = kMetaShadowCell / kMetaShadowSize;
   const uptr kPageSize = GetPageSizeCached() * kMetaRatio;
   if (sz <= 4 * kPageSize) {