Implement safepointing of threads

runtime/vm/debugger.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/debugger.h"
 
 #include "include/dart_api.h"
 
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 287 matching lines @@
   // Give the event to the Service first, as the debugger event handler
   // may go into a message loop and the Service will not.
   //
   // kBreakpointResolved events are handled differently in the vm
   // service, so suppress them here.
   if (ServiceNeedsDebuggerEvent(event->type())) {
     ServiceEvent service_event(event);
     Service::HandleEvent(&service_event);
   }
 
-  if ((FLAG_steal_breakpoints || (event_handler_ == NULL)) &&
-      event->IsPauseEvent()) {
-    // We allow the embedder's default breakpoint handler to be overridden.
-    isolate_->PauseEventHandler();
-  } else if (event_handler_ != NULL) {
-    (*event_handler_)(event);
+  {
+    TransitionVMToNative transition(Thread::Current());
+    if ((FLAG_steal_breakpoints || (event_handler_ == NULL)) &&
+        event->IsPauseEvent()) {
+      // We allow the embedder's default breakpoint handler to be overridden.
+      isolate_->PauseEventHandler();
+    } else if (event_handler_ != NULL) {
+      (*event_handler_)(event);
+    }
   }
 
   if (ServiceNeedsDebuggerEvent(event->type()) && event->IsPauseEvent()) {
     // If we were paused, notify the service that we have resumed.
     const Error& error =
         Error::Handle(isolate_->object_store()->sticky_error());
     ASSERT(error.IsNull() || error.IsUnwindError());
 
     // Only send a resume event when the isolate is not unwinding.
     if (!error.IsUnwindError()) {
@@ skipping 2919 matching lines @@
 }
 
 
 void Debugger::RegisterCodeBreakpoint(CodeBreakpoint* bpt) {
   ASSERT(bpt->next() == NULL);
   bpt->set_next(code_breakpoints_);
   code_breakpoints_ = bpt;
 }
 
 }  // namespace dart