[asan] Add support for Android debug message.

Add ASan report to the "debug message" field in Android tombstones.

llvm-svn: 306184

compiler-rt/lib/asan/asan_report.cc

@@ -204,6 +204,14 @@ class ScopedInErrorReport {
       error_report_callback(buffer_copy.data());
     }
 
+    if (halt_on_error_ && common_flags()->abort_on_error) {
+      // On Android the message is truncated to 512 characters.
+      // FIXME: implement "compact" error format, possibly without, or with
+      // highly compressed stack traces?
+      // FIXME: or just use the summary line as abort message?
+      SetAbortMessage(buffer_copy.data());
+    }
+
     // In halt_on_error = false mode, reset the current error object (before
     // unlocking).
     if (!halt_on_error_)

compiler-rt/lib/sanitizer_common/sanitizer_common.h

@@ -810,8 +810,11 @@ INLINE void LogMessageOnPrintf(const char *str) {}
 #if SANITIZER_LINUX
 // Initialize Android logging. Any writes before this are silently lost.
 void AndroidLogInit();
+void SetAbortMessage(const char *);
 #else
 INLINE void AndroidLogInit() {}
+// FIXME: MacOS implementation could use CRSetCrashLogMessage.
+INLINE void SetAbortMessage(const char *) {}
 #endif
 
 #if SANITIZER_ANDROID

compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc

@@ -551,6 +551,13 @@ void LogMessageOnPrintf(const char *str) {
     WriteToSyslog(str);
 }
 
+#if SANITIZER_ANDROID && __ANDROID_API__ >= 21
+extern "C" void android_set_abort_message(const char *msg);
+void SetAbortMessage(const char *str) { android_set_abort_message(str); }
+#else
+void SetAbortMessage(const char *str) {}
+#endif
+
 #endif // SANITIZER_LINUX
 
 } // namespace __sanitizer