Add flag to always call DebugBreak on abort

R=vegorov@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9706097

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11068 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/flag-definitions.h

@@ -307,6 +307,7 @@ DEFINE_bool(debugger_auto_break, true,
             "automatically set the debug break flag when debugger commands are "
             "in the queue")
 DEFINE_bool(enable_liveedit, true, "enable liveedit experimental feature")
+DEFINE_bool(break_on_abort, true, "always cause a debug break before aborting")
 
 // execution.cc
 DEFINE_int(stack_size, kPointerSize * 128,

src/platform-linux.cc

@@ -388,6 +388,9 @@ void OS::Sleep(int milliseconds) {
 
 void OS::Abort() {
   // Redirect to std abort to signal abnormal program termination.
+  if (FLAG_break_on_abort) {
+    DebugBreak();
+  }
   abort();
 }
 

src/platform-win32.cc

@@ -961,11 +961,11 @@ void OS::Sleep(int milliseconds) {
 
 
 void OS::Abort() {
-  if (!IsDebuggerPresent()) {
+  if (IsDebuggerPresent() || FLAG_break_on_abort) {
+    DebugBreak();
+  } else {
     // Make the MSVCRT do a silent abort.
     raise(SIGABRT);
-  } else {
-    DebugBreak();
   }
 }