[tsan] Add debugging API to retrieve the "external tag" from reports

Differential Revision: https://reviews.llvm.org/D46661



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@332048 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 20 insertions, 0 deletions

diff --git a/lib/tsan/rtl/tsan_debugging.cc b/lib/tsan/rtl/tsan_debugging.cc
index a44b13632..9e5465d37 100644
--- a/lib/tsan/rtl/tsan_debugging.cc
+++ b/lib/tsan/rtl/tsan_debugging.cc
@@ -83,6 +83,13 @@ int __tsan_get_report_data(void *report, const char **description, int *count,
 }
 
 SANITIZER_INTERFACE_ATTRIBUTE
+int __tsan_get_report_tag(void *report, uptr *tag) {
+  const ReportDesc *rep = (ReportDesc *)report;
+  *tag = rep->tag;
+  return 1;
+}
+
+SANITIZER_INTERFACE_ATTRIBUTE
 int __tsan_get_report_stack(void *report, uptr idx, void **trace,
                             uptr trace_size) {
   const ReportDesc *rep = (ReportDesc *)report;
diff --git a/lib/tsan/rtl/tsan_interface.h b/lib/tsan/rtl/tsan_interface.h
index a80a48991..203f6b106 100644
--- a/lib/tsan/rtl/tsan_interface.h
+++ b/lib/tsan/rtl/tsan_interface.h
@@ -117,6 +117,19 @@ int __tsan_get_report_data(void *report, const char **description, int *count,
                            int *unique_tid_count, void **sleep_trace,
                            uptr trace_size);
 
+/// Retrieves the "tag" from a report (for external-race report types). External
+/// races can be associated with a tag which give them more meaning. For example
+/// tag value '1' means "Swift access race". Tag value '0' indicated a plain
+/// external race.
+///
+/// \param report opaque pointer to the current report (obtained as argument in
+///               __tsan_on_report, or from __tsan_get_current_report)
+/// \param [out] tag points to storage that will be filled with the tag value
+///
+/// \returns non-zero value on success, zero on failure
+SANITIZER_INTERFACE_ATTRIBUTE
+int __tsan_get_report_tag(void *report, uptr *tag);
+
 // Returns information about stack traces included in the report.
 SANITIZER_INTERFACE_ATTRIBUTE
 int __tsan_get_report_stack(void *report, uptr idx, void **trace,