[sanitizer] Print SIGTRAP for corresponding signal

Reviewers: eugenis, jfb

Subscribers: #sanitizers, llvm-commits

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D68603

llvm-svn: 373979

compiler-rt/lib/sanitizer_common/sanitizer_posix.cpp

@@ -312,6 +312,8 @@ const char *SignalContext::Describe() const {
       return "SEGV";
     case SIGBUS:
       return "BUS";
+    case SIGTRAP:
+      return "TRAP";
   }
   return "UNKNOWN SIGNAL";
 }

compiler-rt/test/sanitizer_common/TestCases/Linux/signal_trap.cpp

@@ -0,0 +1,8 @@
+// RUN: %clangxx -O1 %s -o %t && %env_tool_opts=handle_sigtrap=2 not %run %t 2>&1 | FileCheck %s
+
+int main() {
+  __builtin_debugtrap();
+}
+
+// CHECK: Sanitizer:DEADLYSIGNAL
+// CHECK: Sanitizer: TRAP on unknown address