debug-delay.js.svn-base

Google浏览器V8内核代码

      }
    }

    // Get the stepaction argument.
    if (stepaction) {
      if (stepaction == 'in') {
        action = Debug.StepAction.StepIn;
      } else if (stepaction == 'min') {
        action = Debug.StepAction.StepMin;
      } else if (stepaction == 'next') {
        action = Debug.StepAction.StepNext;
      } else if (stepaction == 'out') {
        action = Debug.StepAction.StepOut;
      } else {
        throw new Error('Invalid stepaction argument "' + stepaction + '".');
      }
    }

    // Setup the VM for stepping.
    this.exec_state_.prepareStep(action, count);
  }

  // VM should be running after executing this request.
  response.running = true;
};


DebugCommandProcessor.prototype.breakRequest_ = function(request, response) {
  // Ignore as break command does not do anything when broken.
};


DebugCommandProcessor.prototype.setBreakPointRequest_ =
    function(request, response) {
  // Check for legal request.
  if (!request.arguments) {
    response.failed('Missing arguments');
    return;
  }

  // Pull out arguments.
  var type = request.arguments.type;
  var target = request.arguments.target;
  var line = request.arguments.line;
  var column = request.arguments.column;
  var enabled = IS_UNDEFINED(request.arguments.enabled) ?
      true : request.arguments.enabled;
  var condition = request.arguments.condition;
  var ignoreCount = request.arguments.ignoreCount;

  // Check for legal arguments.
  if (!type || !target) {
    response.failed('Missing argument "type" or "target"');
    return;
  }
  if (type != 'function' && type != 'script') {
    response.failed('Illegal type "' + type + '"');
    return;
  }

  // Either function or script break point.
  var break_point_number;
  if (type == 'function') {
    // Handle function break point.
    if (!IS_STRING(target)) {
      response.failed('Argument "target" is not a string value');
      return;
    }
    var f;
    try {
      // Find the function through a global evaluate.
      f = this.exec_state_.evaluateGlobal(target).value();
    } catch (e) {
      response.failed('Error: "' + %ToString(e) +
                      '" evaluating "' + target + '"');
      return;
    }
    if (!IS_FUNCTION(f)) {
      response.failed('"' + target + '" does not evaluate to a function');
      return;
    }

    // Set function break point.
    break_point_number = Debug.setBreakPoint(f, line, column, condition);
  } else {
    // set script break point.
    break_point_number = Debug.setScriptBreakPoint(target,
                                                   line, column,
                                                   condition);
  }

  // Set additional break point properties.
  var break_point = Debug.findBreakPoint(break_point_number);
  if (ignoreCount) {
    Debug.changeBreakPointIgnoreCount(break_point_number, ignoreCount);
  }
  if (!enabled) {
    Debug.disableBreakPoint(break_point_number);
  }

  // Add the break point number to the response.
  response.body = { type: type,
                    breakpoint: break_point_number }

  // Add break point information to the response.
  if (break_point instanceof ScriptBreakPoint) {
    response.body.type = 'script';
    response.body.script_name = break_point.script_name();
    response.body.line = break_point.line();
    response.body.column = break_point.column();
  } else {
    response.body.type = 'function';
  }
};


DebugCommandProcessor.prototype.changeBreakPointRequest_ = function(request, response) {
  // Check for legal request.
  if (!request.arguments) {
    response.failed('Missing arguments');
    return;
  }

  // Pull out arguments.
  var break_point = %ToNumber(request.arguments.breakpoint);
  var enabled = request.arguments.enabled;
  var condition = request.arguments.condition;
  var ignoreCount = request.arguments.ignoreCount;

  // Check for legal arguments.
  if (!break_point) {
    response.failed('Missing argument "breakpoint"');
    return;
  }

  // Change enabled state if supplied.
  if (!IS_UNDEFINED(enabled)) {
    if (enabled) {
      Debug.enableBreakPoint(break_point);
    } else {
      Debug.disableBreakPoint(break_point);
    }
  }

  // Change condition if supplied
  if (!IS_UNDEFINED(condition)) {
    Debug.changeBreakPointCondition(break_point, condition);
  }

  // Change ignore count if supplied
  if (!IS_UNDEFINED(ignoreCount)) {
    Debug.changeBreakPointIgnoreCount(break_point, ignoreCount);
  }
}


DebugCommandProcessor.prototype.clearBreakPointRequest_ = function(request, response) {
  // Check for legal request.
  if (!request.arguments) {
    response.failed('Missing arguments');
    return;
  }

  // Pull out arguments.
  var break_point = %ToNumber(request.arguments.breakpoint);

  // Check for legal arguments.
  if (!break_point) {
    response.failed('Missing argument "breakpoint"');
    return;
  }

  // Clear break point.
  Debug.clearBreakPoint(break_point);
}


DebugCommandProcessor.prototype.backtraceRequest_ = function(request, response) {
  // Get the number of frames.
  var total_frames = this.exec_state_.frameCount();

  // Default frame range to include in backtrace.
  var from_index = 0
  var to_index = kDefaultBacktraceLength;

  // Get the range from the arguments.
  if (request.arguments) {
    from_index = request.arguments.fromFrame;
    if (from_index < 0) {
      return response.failed('Invalid frame number');
    }
    to_index = request.arguments.toFrame;
    if (to_index < 0) {
      return response.failed('Invalid frame number');
    }
  }

  // Adjust the index.
  to_index = Math.min(total_frames, to_index);

  if (to_index <= from_index) {
    var error = 'Invalid frame range';
    return response.failed(error);
  }

  // Create the response body.
  var frames = [];
  for (var i = from_index; i < to_index; i++) {
    frames.push(this.exec_state_.frame(i));
  }
  response.body = {
    fromFrame: from_index,
    toFrame: to_index,
    totalFrames: total_frames,
    frames: frames
  }
};


DebugCommandProcessor.prototype.backtracec = function(cmd, args) {
  return this.exec_state_.cframesValue();
};


DebugCommandProcessor.prototype.frameRequest_ = function(request, response) {
  // With no arguments just keep the selected frame.
  if (request.arguments && request.arguments.number >= 0) {
    this.exec_state_.setSelectedFrame(request.arguments.number);
  }
  response.body = this.exec_state_.frame();
};


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;

  // 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');
  }

  // Global evaluate.
  if (global) {
    // Evaluate in the global context.
    response.body =
        this.exec_state_.evaluateGlobal(expression), Boolean(disable_break);
    return;
  }

  // Default value for disable_break is true.
  if (IS_UNDEFINED(disable_break)) {
    disable_break = true;
  }

  // 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));
    return;
  } else {
    // Evaluate in the selected frame.
    response.body = this.exec_state_.frame().evaluate(
        expression, Boolean(disable_break));
    return;
  }
};


DebugCommandProcessor.prototype.sourceRequest_ = function(request, response) {
  var from_line;
  var to_line;
  var frame = this.exec_state_.frame();
  if (request.arguments) {
    // Pull out arguments.
    from_line = request.arguments.fromLine;
    to_line = request.arguments.toLine;

    if (!IS_UNDEFINED(request.arguments.frame)) {
      var frame_number = %ToNumber(request.arguments.frame);
      if (frame_number < 0 || frame_number >= this.exec_state_.frameCount()) {
        return response.failed('Invalid frame "' + frame + '"');
      }
      frame = this.exec_state_.frame(frame_number);
    }
  }

  // Get the script selected.
  var script = frame.func().script();
  if (!script) {
    return response.failed('No source');
  }

  // Get the source slice and fill it into the response.
  var slice = script.sourceSlice(from_line, to_line);
  if (!slice) {
    return response.failed('Invalid line interval');
  }
  response.body = {};
  response.body.source = slice.sourceText();
  response.body.fromLine = slice.from_line;
  response.body.toLine = slice.to_line;
  response.body.fromPosition = slice.from_position;
  response.body.toPosition = slice.to_position;
  response.body.totalLines = script.lineCount();
};


DebugCommandProcessor.prototype.scriptsRequest_ = function(request, response) {
  var types = ScriptTypeFlag(Debug.ScriptType.Normal);
  if (request.arguments) {
    // Pull out arguments.
    if (!IS_UNDEFINED(request.arguments.types)) {
      types = %ToNumber(request.arguments.types);
      if (isNaN(types) || types < 0) {
        return response.failed('Invalid types "' + request.arguments.types + '"');
      }
    }
  }

  // Collect all scripts in the heap.
  var scripts = %DebugGetLoadedScripts();

  response.body = [];

  for (var i = 0; i < scripts.length; i++) {
    if (types & ScriptTypeFlag(scripts[i].type)) {
      var script = {};
      if (scripts[i].name) {
        script.name = scripts[i].name;
      }
      script.lineOffset = scripts[i].line_offset;
      script.columnOffset = scripts[i].column_offset;
      script.lineCount = scripts[i].lineCount();
      script.sourceStart = scripts[i].source.substring(0, 80);
      script.sourceLength = scripts[i].source.length;
      script.type = scripts[i].type;
      response.body.push(script);
    }
  }
};


// Check whether the JSON response indicate that the VM should be running.
DebugCommandProcessor.prototype.isRunning = function(json_response) {
  try {
    // Convert the JSON string to an object.
    response = %CompileString('(' + json_response + ')', 0, false)();

    // Return whether VM should be running after this request.
    return response.running;

  } catch (e) {
     return false;
  }
}


DebugCommandProcessor.prototype.systemBreak = function(cmd, args) {
  return %SystemBreak();
};


function NumberToHex8Str(n) {
  var r = "";
  for (var i = 0; i < 8; ++i) {
    var c = hexCharArray[n & 0x0F];  // hexCharArray is defined in uri.js
    r = c + r;
    n = n >>> 4;
  }
  return r;
};

DebugCommandProcessor.prototype.formatCFrames = function(cframes_value) {
  var result = "";
  if (cframes_value == null || cframes_value.length == 0) {
    result += "(stack empty)";
  } else {
    for (var i = 0; i < cframes_value.length; ++i) {
      if (i != 0) result += "\n";
      result += this.formatCFrame(cframes_value[i]);
    }
  }
  return result;
};


DebugCommandProcessor.prototype.formatCFrame = function(cframe_value) {
  var result = "";
  result += "0x" + NumberToHex8Str(cframe_value.address);
  if (!IS_UNDEFINED(cframe_value.text)) {
    result += " " + cframe_value.text;
  }
  return result;
}


/**
 * Convert an Object to its JSON representation (see http://www.json.org/).
 * This implementation simply runs through all string property names and adds
 * each property to the JSON representation for some predefined types. For type
 * "object" the function calls itself recursively unless the object has the
 * function property "toJSONProtocol" in which case that is used. This is not
 * a general implementation but sufficient for the debugger. Note that circular
 * structures will cause infinite recursion.
 * @param {Object} object The object to format as JSON
 * @return {string} JSON formatted object value
 */
function SimpleObjectToJSON_(object) {
  var content = [];
  for (var key in object) {
    // Only consider string keys.
    if (typeof key == 'string') {
      var property_value = object[key];

      // Format the value based on its type.
      var property_value_json;
      switch (typeof property_value) {
        case 'object':
          if (typeof property_value.toJSONProtocol == 'function') {
            property_value_json = property_value.toJSONProtocol(true)
          } else if (IS_ARRAY(property_value)){
            property_value_json = SimpleArrayToJSON_(property_value);
          } else {
            property_value_json = SimpleObjectToJSON_(property_value);
          }
          break;

        case 'boolean':
          property_value_json = BooleanToJSON_(property_value);
          break;

        case 'number':
          property_value_json = NumberToJSON_(property_value);
          break;

        case 'string':
          property_value_json = StringToJSON_(property_value);
          break;

        default:
          property_value_json = null;
      }

      // Add the property if relevant.
      if (property_value_json) {
        content.push(StringToJSON_(key) + ':' + property_value_json);
      }
    }
  }

  // Make JSON object representation.
  return '{' + content.join(',') + '}';
};

/**
 * Convert an array to its JSON representation. This is a VERY simple
 * implementation just to support what is needed for the debugger.
 * @param {Array} arrya The array to format as JSON
 * @return {string} JSON formatted array value
 */
function SimpleArrayToJSON_(array) {
  // Make JSON array representation.
  var json = '[';
  for (var i = 0; i < array.length; i++) {
    if (i != 0) {
      json += ',';
    }
    var elem = array[i];
    if (elem.toJSONProtocol) {
      json += elem.toJSONProtocol(true)
    } else if (IS_OBJECT(elem))  {
      json += SimpleObjectToJSON_(elem);
    } else if (IS_BOOLEAN(elem)) {
      json += BooleanToJSON_(elem);
    } else if (IS_NUMBER(elem)) {
      json += NumberToJSON_(elem);
    } else if (IS_STRING(elem)) {
      json += StringToJSON_(elem);
    } else {
      json += elem;
    }
  }
  json += ']';
  return json;
};