[sanitizer] Stop unwinding the stack when a close-to-zero PC is found

On OS X, we often get stack trace in a report that ends with a 0x0 frame.  To get rid of it, let's trim the stack trace when we find a close-to-zero value, which is obviously not a valid PC.

Differential Revision: http://reviews.llvm.org/D14656



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@273886 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 7 deletions

diff --git a/lib/sanitizer_common/sanitizer_common.cc b/lib/sanitizer_common/sanitizer_common.cc
index 8aea7bcdb..79fcbb118 100644
--- a/lib/sanitizer_common/sanitizer_common.cc
+++ b/lib/sanitizer_common/sanitizer_common.cc
@@ -25,13 +25,7 @@ namespace __sanitizer {
 const char *SanitizerToolName = "SanitizerTool";
 
 atomic_uint32_t current_verbosity;
-
-uptr GetPageSizeCached() {
-  static uptr PageSize;
-  if (!PageSize)
-    PageSize = GetPageSize();
-  return PageSize;
-}
+uptr PageSizeCached;
 
 StaticSpinMutex report_file_mu;
 ReportFile report_file = {&report_file_mu, kStderrFd, "", "", 0};