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

runtime/vm/os_linux.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_LINUX)
 
 #include "vm/os.h"
 
 #include <errno.h>  // NOLINT
@@ skipping 490 matching lines @@
     // Copy remainder into requested and repeat.
     req = rem;
   }
 }
 
 
 // TODO(regis, iposva): When this function is no longer called from the
 // CodeImmutability test in object_test.cc, it will be called only from the
 // simulator, which means that only the Intel implementation is needed.
 void OS::DebugBreak() {
-#if defined(HOST_ARCH_X64) || defined(HOST_ARCH_IA32)
-  asm("int $3");
-#elif defined(HOST_ARCH_ARM) && !defined(__THUMBEL__)
-  asm("svc #0x9f0001");  // __ARM_NR_breakpoint
-#elif defined(HOST_ARCH_ARM) && defined(__THUMBEL__)
-  UNIMPLEMENTED();
-#elif defined(HOST_ARCH_MIPS) || defined(HOST_ARCH_ARM64)
-  UNIMPLEMENTED();
-#else
-#error Unsupported architecture.
-#endif
+  __builtin_trap();
 }
 
 
 char* OS::StrNDup(const char* s, intptr_t n) {
   return strndup(s, n);
 }
 
 
 void OS::Print(const char* format, ...) {
   va_list args;
@@ skipping 89 matching lines @@
 }
 
 
 void OS::Exit(int code) {
   exit(code);
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)