[futex] Allow debugger to break in the middle of a futexWait

src/debug/debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/debug/debug.h"
 
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 22 matching lines @@
       message_handler_(NULL),
       command_received_(0),
       command_queue_(isolate->logger(), kQueueInitialSize),
       is_active_(false),
       is_suppressed_(false),
       live_edit_enabled_(true),  // TODO(yangguo): set to false by default.
       break_disabled_(false),
       in_debug_event_listener_(false),
       break_on_exception_(false),
       break_on_uncaught_exception_(false),
+      break_in_nondebuggable_(false),
       debug_info_list_(NULL),
       isolate_(isolate) {
   ThreadInit();
 }
 
 
 static v8::Local<v8::Context> GetDebugEventContext(Isolate* isolate) {
   Handle<Context> context = isolate->debug()->debugger_entry()->GetContext();
   // Isolate::context() may have been NULL when "script collected" event
   // occured.
@@ skipping 2217 matching lines @@
   if (!is_active()) return;
 
   StackLimitCheck check(isolate_);
   if (check.HasOverflowed()) return;
 
   { JavaScriptFrameIterator it(isolate_);
     DCHECK(!it.done());
     Object* fun = it.frame()->function();
     if (fun && fun->IsJSFunction()) {
       // Don't stop in builtin functions.
-      if (!JSFunction::cast(fun)->IsSubjectToDebugging()) return;
+      if (!(JSFunction::cast(fun)->IsSubjectToDebugging() ||
+            break_in_nondebuggable_))

[Yang, 2015/09/01 01:55:48]

please add brackets around return

[binji, 2015/09/16 17:17:54]

Done.

+        return;
       GlobalObject* global = JSFunction::cast(fun)->context()->global_object();
       // Don't stop in debugger functions.
       if (IsDebugGlobal(global)) return;
     }
   }
 
   // Collect the break state before clearing the flags.
   bool debug_command_only = isolate_->stack_guard()->CheckDebugCommand() &&
                             !isolate_->stack_guard()->CheckDebugBreak();
 
@@ skipping 322 matching lines @@
 }
 
 
 void LockingCommandMessageQueue::Clear() {
   base::LockGuard<base::Mutex> lock_guard(&mutex_);
   queue_.Clear();
 }
 
 }  // namespace internal
 }  // namespace v8