From: Dmitry Vyukov <dvyukov@google.com>
Date: Wed, 27 Apr 2016 14:03:14 +0000 (+0000)
Subject: tsan: fix windows Go support
X-Git-Tag: llvmorg-3.9.0-rc1~7770
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=221e2c61ec3b83add0d54b41eaee650b9ca6b386;p=platform%2Fupstream%2Fllvm.git

tsan: fix windows Go support

Unmap can't unmap arbitrary regions on windows.

llvm-svn: 267716
---

diff --git a/compiler-rt/lib/tsan/rtl/tsan_sync.cc b/compiler-rt/lib/tsan/rtl/tsan_sync.cc
index c58821a..15759d4 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_sync.cc
+++ b/compiler-rt/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) {