Vendor import of compiler-rt trunk r321017:vendor/compiler-rt/compiler-rt-trunk-r321017

https://llvm.org/svn/llvm-project/compiler-rt/trunk@321017

1 files changed, 53 insertions, 0 deletions

diff --git a/lib/ubsan/ubsan_signals_standalone.cc b/lib/ubsan/ubsan_signals_standalone.cc
new file mode 100644
index 000000000000..4c6646dd8b0b
--- /dev/null
+++ b/lib/ubsan/ubsan_signals_standalone.cc
@@ -0,0 +1,53 @@
+//=-- ubsan_signals_standalone.cc
+//------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Installs signal handlers and related interceptors for UBSan standalone.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ubsan_platform.h"
+#if CAN_SANITIZE_UB
+#include "interception/interception.h"
+#include "sanitizer_common/sanitizer_stacktrace.h"
+#include "ubsan_diag.h"
+#include "ubsan_init.h"
+
+#define COMMON_INTERCEPT_FUNCTION(name) INTERCEPT_FUNCTION(name)
+#include "sanitizer_common/sanitizer_signal_interceptors.inc"
+
+namespace __ubsan {
+
+#if SANITIZER_FUCHSIA
+void InitializeDeadlySignals() {}
+#else
+static void OnStackUnwind(const SignalContext &sig, const void *,
+                          BufferedStackTrace *stack) {
+  GetStackTrace(stack, kStackTraceMax, sig.pc, sig.bp, sig.context,
+                common_flags()->fast_unwind_on_fatal);
+}
+
+static void UBsanOnDeadlySignal(int signo, void *siginfo, void *context) {
+  HandleDeadlySignal(siginfo, context, GetTid(), &OnStackUnwind, nullptr);
+}
+
+static bool is_initialized = false;
+
+void InitializeDeadlySignals() {
+  if (is_initialized)
+    return;
+  is_initialized = true;
+  InitializeSignalInterceptors();
+  InstallDeadlySignalHandlers(&UBsanOnDeadlySignal);
+}
+#endif
+
+} // namespace __ubsan
+
+#endif // CAN_SANITIZE_UB