contrib/compiler-rt/lib/ubsan/ubsan_signals_standalone.cc

   1 //=-- ubsan_signals_standalone.cc
   2 //------------------------------------------------===//
   3 //
   4 //                     The LLVM Compiler Infrastructure
   5 //
   6 // This file is distributed under the University of Illinois Open Source
   7 // License. See LICENSE.TXT for details.
   8 //
   9 //===----------------------------------------------------------------------===//
  10 //
  11 // Installs signal handlers and related interceptors for UBSan standalone.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "ubsan_platform.h"
  16 #if CAN_SANITIZE_UB
  17 #include "interception/interception.h"
  18 #include "sanitizer_common/sanitizer_stacktrace.h"
  19 #include "ubsan_diag.h"
  20 #include "ubsan_init.h"
  21
  22 #define COMMON_INTERCEPT_FUNCTION(name) INTERCEPT_FUNCTION(name)
  23 #include "sanitizer_common/sanitizer_signal_interceptors.inc"
  24
  25 namespace __ubsan {
  26
  27 #if SANITIZER_FUCHSIA
  28 void InitializeDeadlySignals() {}
  29 #else
  30 static void OnStackUnwind(const SignalContext &sig, const void *,
  31                           BufferedStackTrace *stack) {
  32   GetStackTrace(stack, kStackTraceMax, sig.pc, sig.bp, sig.context,
  33                 common_flags()->fast_unwind_on_fatal);
  34 }
  35
  36 static void UBsanOnDeadlySignal(int signo, void *siginfo, void *context) {
  37   HandleDeadlySignal(siginfo, context, GetTid(), &OnStackUnwind, nullptr);
  38 }
  39
  40 static bool is_initialized = false;
  41
  42 void InitializeDeadlySignals() {
  43   if (is_initialized)
  44     return;
  45   is_initialized = true;
  46   InitializeSignalInterceptors();
  47   InstallDeadlySignalHandlers(&UBsanOnDeadlySignal);
  48 }
  49 #endif
  50
  51 } // namespace __ubsan
  52
  53 #endif // CAN_SANITIZE_UB