Introduce additional context to evaluate operations

src/debug-debugger.js

 // Copyright 2006-2008 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 840 matching lines @@
 Debug.scripts = function() {
   // Collect all scripts in the heap.
   return %DebugGetLoadedScripts();
 };
 
 
 Debug.debuggerFlags = function() {
   return debugger_flags;
 };
 
+Debug.MakeMirror = MakeMirror;
 
 function MakeExecutionState(break_id) {
   return new ExecutionState(break_id);
 }
 
 function ExecutionState(break_id) {
   this.break_id = break_id;
   this.selected_frame = 0;
 }
 
 ExecutionState.prototype.prepareStep = function(opt_action, opt_count) {
   var action = Debug.StepAction.StepIn;
   if (!IS_UNDEFINED(opt_action)) action = %ToNumber(opt_action);
   var count = opt_count ? %ToNumber(opt_count) : 1;
 
   return %PrepareStep(this.break_id, action, count);
 }
 
-ExecutionState.prototype.evaluateGlobal = function(source, disable_break) {
-  return MakeMirror(
-      %DebugEvaluateGlobal(this.break_id, source, Boolean(disable_break)));
+ExecutionState.prototype.evaluateGlobal = function(source, disable_break,
+    opt_additional_context) {
+  return MakeMirror(%DebugEvaluateGlobal(this.break_id, source,
+                                         Boolean(disable_break),
+                                         opt_additional_context));
 };
 
 ExecutionState.prototype.frameCount = function() {
   return %GetFrameCount(this.break_id);
 };
 
 ExecutionState.prototype.threadCount = function() {
   return %GetThreadCount(this.break_id);
 };
 
@@ skipping 938 matching lines @@
 DebugCommandProcessor.prototype.evaluateRequest_ = function(request, response) {
   if (!request.arguments) {
     return response.failed('Missing arguments');
   }
 
   // Pull out arguments.
   var expression = request.arguments.expression;
   var frame = request.arguments.frame;
   var global = request.arguments.global;
   var disable_break = request.arguments.disable_break;
+  var additional_context = request.arguments.additional_context;
 
   // The expression argument could be an integer so we convert it to a
   // string.
   try {
     expression = String(expression);
   } catch(e) {
     return response.failed('Failed to convert expression argument to string');
   }
 
   // Check for legal arguments.
   if (!IS_UNDEFINED(frame) && global) {
     return response.failed('Arguments "frame" and "global" are exclusive');
   }
+  
+  var additional_context_object;
+  if (additional_context) {
+    additional_context_object = {};
+    for (var key in additional_context) {
+      var context_value_handle = additional_context[key];
+      var context_value_mirror = LookupMirror(context_value_handle);
+      if (!context_value_mirror) {
+        return response.failed(
+            "Context object '" + key + "' #" + context_value_handle +
+                "# not found");
+      }
+      additional_context_object[key] = context_value_mirror.value(); 
+    }
+  }
 
   // Global evaluate.
   if (global) {
     // Evaluate in the global context.
-    response.body =
-        this.exec_state_.evaluateGlobal(expression, Boolean(disable_break));
+    response.body = this.exec_state_.evaluateGlobal(
+        expression, Boolean(disable_break), additional_context_object);
     return;
   }
 
   // Default value for disable_break is true.
   if (IS_UNDEFINED(disable_break)) {
     disable_break = true;
   }
 
   // No frames no evaluate in frame.
   if (this.exec_state_.frameCount() == 0) {
     return response.failed('No frames');
   }
 
   // Check whether a frame was specified.
   if (!IS_UNDEFINED(frame)) {
     var frame_number = %ToNumber(frame);
     if (frame_number < 0 || frame_number >= this.exec_state_.frameCount()) {
       return response.failed('Invalid frame "' + frame + '"');
     }
     // Evaluate in the specified frame.
     response.body = this.exec_state_.frame(frame_number).evaluate(
-        expression, Boolean(disable_break));
+        expression, Boolean(disable_break), additional_context_object);
     return;
   } else {
     // Evaluate in the selected frame.
     response.body = this.exec_state_.frame().evaluate(
-        expression, Boolean(disable_break));
+        expression, Boolean(disable_break), additional_context_object);
     return;
   }
 };
 
 
 DebugCommandProcessor.prototype.lookupRequest_ = function(request, response) {
   if (!request.arguments) {
     return response.failed('Missing arguments');
   }
 
@@ skipping 374 matching lines @@
     case 'string':
     case 'number':
       json = value;
       break
 
     default:
       json = null;
   }
   return json;
 }