- Determine whether the simulator is being used in globals.h

runtime/vm/os_macos.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_OS_MACOS)
 
 #include "vm/os.h"
 
 #include <errno.h>  // NOLINT
@@ skipping 136 matching lines @@
     }
     // We should only ever see an interrupt error.
     ASSERT(errno == EINTR);
     // Copy remainder into requested and repeat.
     req = rem;
   }
 }
 
 
 void OS::DebugBreak() {
-#if defined(HOST_ARCH_X64) || defined(HOST_ARCH_IA32)
-  asm("int $3");
-#else
-#error Unsupported architecture.
-#endif
+  __builtin_trap();
 }
 
 
 char* OS::StrNDup(const char* s, intptr_t n) {
   // strndup has only been added to Mac OS X in 10.7. We are supplying
   // our own copy here if needed.
 #if !defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) || \
     __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ <= 1060
   intptr_t len = strlen(s);
   if ((n < 0) || (len < 0)) {
@@ skipping 96 matching lines @@
 }
 
 
 void OS::Exit(int code) {
   exit(code);
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_MACOS)