[UBSan] Add the ability to dump call stacks to -fsanitize=vptr

This change introduces the first UBSan-specific runtime flag: print_stacktrace
(off by default). It can be set in UBSAN_OPTIONS to unwind and print call stacks
in addition to diagnostic messages. For now these stacks are printed only
in vptr checker.

This change is based on http://reviews.llvm.org/D4410 by Byoungyoung Lee!


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@213783 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/ubsan/ubsan_diag.h b/lib/ubsan/ubsan_diag.h
index 54d15a0cc..033695190 100644
--- a/lib/ubsan/ubsan_diag.h
+++ b/lib/ubsan/ubsan_diag.h
@@ -14,6 +14,7 @@
 #define UBSAN_DIAG_H
 
 #include "ubsan_value.h"
+#include "sanitizer_common/sanitizer_stacktrace.h"
 
 namespace __ubsan {
 
@@ -203,6 +204,13 @@ public:
   Diag &operator<<(const Range &R) { return AddRange(R); }
 };
 
+void MaybePrintStackTrace(uptr pc, uptr bp);
+
+#define MAYBE_PRINT_STACK_TRACE() do { \
+  GET_CALLER_PC_BP_SP; \
+  MaybePrintStackTrace(pc, bp); \
+} while (0)
+
 } // namespace __ubsan
 
 #endif // UBSAN_DIAG_H