DevTools: Collect truncated scopes for async stacks.

Source/bindings/v8/DebuggerScript.js

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 317 matching lines @@
     // The frameMirror and scopeMirror can be accessed only while paused on the debugger.
     var frameDetails = frameMirror.details();
 
     var funcObject = frameDetails.func();
     var sourcePosition = frameDetails.sourcePosition();
     var thisObject = frameDetails.receiver();
 
     var isAtReturn = !!frameDetails.isAtReturn();
     var returnValue = isAtReturn ? frameDetails.returnValue() : undefined;
 
-    var scopeMirrors = (scopeDetailsLevel === DebuggerScript.ScopeInfoDetails.NoScopes ? [] : frameMirror.allScopes());
+    var scopeMirrors = (scopeDetailsLevel === DebuggerScript.ScopeInfoDetails.NoScopes ? [] : frameMirror.allScopes(scopeDetailsLevel === DebuggerScript.ScopeInfoDetails.FastAsyncScopes));

[yurys, 2014/03/25 08:51:17]

Is this parameter already supported in V8?

[aandrey, 2014/03/25 08:57:31]

Surely.
V8 change: https://codereview.chromium.org/203463011/

     var scopeTypes = new Array(scopeMirrors.length);
     var scopeObjects = new Array(scopeMirrors.length);
     for (var i = 0; i < scopeMirrors.length; ++i) {
         var scopeDetails = scopeMirrors[i].details();
         scopeTypes[i] = scopeDetails.type();
         scopeObjects[i] = scopeDetails.object();
     }
 
     // Calculated lazily.
     var scopeChain;
@@ skipping 143 matching lines @@
         break;
     case ScopeType.Block:
         // Unsupported yet. Mustn't be reachable.
         break;
     }
     return result;
 }
 
 return DebuggerScript;
 })();