Make rewind work on DBC

runtime/vm/service.cc

 // Copyright (c) 2013, 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/service.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/globals.h"
 
@@ skipping 3023 matching lines @@
     new UIntParameter("frameIndex", false), NULL,
 };
 
 
 static bool Resume(Thread* thread, JSONStream* js) {
   const char* step_param = js->LookupParam("step");
   Debugger::ResumeAction step = Debugger::kContinue;
   if (step_param != NULL) {
     step = EnumMapper(step_param, step_enum_names, step_enum_values);
   }
-#if defined(TARGET_ARCH_DBC)
-  if (step == Debugger::kStepRewind) {
-    js->PrintError(kCannotResume,
-                   "Rewind not yet implemented on this architecture");
-    return true;
-  }
-#endif
   intptr_t frame_index = 1;
   const char* frame_index_param = js->LookupParam("frameIndex");
   if (frame_index_param != NULL) {
     if (step != Debugger::kStepRewind) {
       // Only rewind supports the frameIndex parameter.
       js->PrintError(
           kInvalidParams,
           "%s: the 'frameIndex' parameter can only be used when rewinding",
           js->method());
       return true;
@@ skipping 1114 matching lines @@
     if (strcmp(method_name, method.name) == 0) {
       return &method;
     }
   }
   return NULL;
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart