[compiler-rt] Replace ifs with switch statement in IsHandledDeadlySignal

[eugenis]

LGTM

lib/sanitizer_common/sanitizer_mac.cc

397

I think we normally don't do braces on single-line if statements. I'd move the comment one line up though.

[vitalybuka]

Moved comment

lib/sanitizer_common/sanitizer_linux.cc

AndroidApiLevel AndroidGetApiLevel() {
   level = AndroidDetectApiLevel();
   atomic_store(&android_api_level, level, memory_order_relaxed);
   return level;
 }
 
 #endif
 
 bool IsHandledDeadlySignal(int signum) {
-  if (common_flags()->handle_abort && signum == SIGABRT)
-    return true;
-  if (common_flags()->handle_sigill && signum == SIGILL)
-    return true;
-  if (common_flags()->handle_sigfpe && signum == SIGFPE)
-    return true;
-  if (common_flags()->handle_segv && signum == SIGSEGV)
-    return true;
-  return common_flags()->handle_sigbus && signum == SIGBUS;
+  switch (signum) {
+    case SIGABRT:
+      return common_flags()->handle_abort;
+    case SIGILL:
+      return common_flags()->handle_sigill;
+    case SIGFPE:
+      return common_flags()->handle_sigfpe;
+    case SIGSEGV:
+      return common_flags()->handle_segv;
+    case SIGBUS:
+      return common_flags()->handle_sigbus;
+  }
+  return false;
 }
 
 #if !SANITIZER_GO
 void *internal_start_thread(void(*func)(void *arg), void *arg) {
   // Start the thread with signals blocked, otherwise it can steal user signals.
   __sanitizer_sigset_t set, old;
   internal_sigfillset(&set);
 #if SANITIZER_LINUX && !SANITIZER_ANDROID

lib/sanitizer_common/sanitizer_mac.cc

 
 void ListOfModules::init() {
   clear();
   MemoryMappingLayout memory_mapping(false);
   memory_mapping.DumpListOfModules(&modules_);
 }
 
 bool IsHandledDeadlySignal(int signum) {
-  if ((SANITIZER_WATCHOS || SANITIZER_TVOS) && !(SANITIZER_IOSSIM))
+  if ((SANITIZER_WATCHOS || SANITIZER_TVOS) && !(SANITIZER_IOSSIM)) {
     // Handling fatal signals on watchOS and tvOS devices is disallowed.
     return false;
-  if (common_flags()->handle_abort && signum == SIGABRT)
-    return true;
-  if (common_flags()->handle_sigill && signum == SIGILL)
-    return true;
-  if (common_flags()->handle_sigfpe && signum == SIGFPE)
-    return true;
-  if (common_flags()->handle_segv && signum == SIGSEGV)
-    return true;
-  return common_flags()->handle_sigbus && signum == SIGBUS;
+  }
+  switch (signum) {
+    case SIGABRT:
+      return common_flags()->handle_abort;
+    case SIGILL:
+      return common_flags()->handle_sigill;
+    case SIGFPE:
+      return common_flags()->handle_sigfpe;
+    case SIGSEGV:
+      return common_flags()->handle_segv;
+    case SIGBUS:
+      return common_flags()->handle_sigbus;
+  }
+  return false;
 }
 
 MacosVersion cached_macos_version = MACOS_VERSION_UNINITIALIZED;
 
 MacosVersion GetMacosVersionInternal() {
   int mib[2] = { CTL_KERN, KERN_OSRELEASE };
   char version[100];
   uptr len = 0, maxlen = sizeof(version) / sizeof(version[0]);