Prune some internal objects' prototypes.

src/messages.js

-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2011 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
 //       with the distribution.
@@ skipping 38 matching lines @@
 
 var kReplacementMarkers = [ "%0", "%1", "%2", "%3" ];
 
 function FormatString(format, message) {
   var args = %MessageGetArguments(message);
   var result = "";
   var arg_num = 0;
   for (var i = 0; i < format.length; i++) {
     var str = format[i];
     for (arg_num = 0; arg_num < kReplacementMarkers.length; arg_num++) {
-      if (format[i] !== kReplacementMarkers[arg_num]) continue;
+      if (str !== kReplacementMarkers[arg_num]) continue;
       try {
         str = ToDetailString(args[arg_num]);
       } catch (e) {
         str = "#<error>";
       }
     }
     result += str;
   }
   return result;
 }
@@ skipping 22 matching lines @@
 function ToStringCheckErrorObject(obj) {
   if (IsNativeErrorObject(obj)) {
     return %_CallFunction(obj, errorToString);
   } else {
     return ToString(obj);
   }
 }
 
 
 function ToDetailString(obj) {
-  if (obj != null && IS_OBJECT(obj) && obj.toString === $Object.prototype.toString) {
+  if (obj != null && IS_OBJECT(obj) &&
+      obj.toString === $Object.prototype.toString) {
     var constructor = obj.constructor;
     if (!constructor) return ToStringCheckErrorObject(obj);
     var constructorName = constructor.name;
     if (!constructorName || !IS_STRING(constructorName)) {
       return ToStringCheckErrorObject(obj);
     }
     return "#<" + constructorName + ">";
   } else {
     return ToStringCheckErrorObject(obj);
   }
@@ skipping 439 matching lines @@
  */
 function SourceLocation(script, position, line, column, start, end) {
   this.script = script;
   this.position = position;
   this.line = line;
   this.column = column;
   this.start = start;
   this.end = end;
 }
 
+SourceLocation.prototype.__proto__ = null;
 
 const kLineLengthLimit = 78;
 
 /**
  * Restrict source location start and end positions to make the source slice
  * no more that a certain number of characters wide.
  * @param {number} opt_limit The with limit of the source text with a default
  *     of 78
  * @param {number} opt_before The number of characters to prefer before the
  *     position with a default value of 10 less that the limit
@@ skipping 69 matching lines @@
  * @constructor
  */
 function SourceSlice(script, from_line, to_line, from_position, to_position) {
   this.script = script;
   this.from_line = from_line;
   this.to_line = to_line;
   this.from_position = from_position;
   this.to_position = to_position;
 }
 
+SourceSlice.prototype.__proto__ = null;
 
 /**
  * Get the source text for a SourceSlice
  * @return {String} Source text for this slice. The last line will include
  *     the line terminating characters (if any)
  */
 SourceSlice.prototype.sourceText = function () {
   return %_CallFunction(this.script.source,
                         this.from_position,
                         this.to_position,
@@ skipping 47 matching lines @@
   desc = ToPropertyDescriptor(desc);
   DefineOwnProperty(obj, name, desc, true);
 }
 
 function CallSite(receiver, fun, pos) {
   this.receiver = receiver;
   this.fun = fun;
   this.pos = pos;
 }
 
+CallSite.prototype.__proto__ = null;
+
 CallSite.prototype.getThis = function () {
   return this.receiver;
 };
 
 CallSite.prototype.getTypeName = function () {
   var constructor = this.receiver.constructor;
-  if (!constructor)
+  if (!constructor) {
     return %_CallFunction(this.receiver, ObjectToString);
+  }
   var constructorName = constructor.name;
-  if (!constructorName)
+  if (!constructorName) {
     return %_CallFunction(this.receiver, ObjectToString);
+  }
   return constructorName;
 };
 
 CallSite.prototype.isToplevel = function () {
-  if (this.receiver == null)
+  if (this.receiver == null) {
     return true;
+  }
   return IS_GLOBAL(this.receiver);
 };
 
 CallSite.prototype.isEval = function () {
   var script = %FunctionGetScript(this.fun);
   return script && script.compilation_type == COMPILATION_TYPE_EVAL;
 };
 
 CallSite.prototype.getEvalOrigin = function () {
   var script = %FunctionGetScript(this.fun);
@@ skipping 12 matching lines @@
 CallSite.prototype.getFunctionName = function () {
   // See if the function knows its own name
   var name = this.fun.name;
   if (name) {
     return name;
   } else {
     return %FunctionGetInferredName(this.fun);
   }
   // Maybe this is an evaluation?
   var script = %FunctionGetScript(this.fun);
-  if (script && script.compilation_type == COMPILATION_TYPE_EVAL)
+  if (script && script.compilation_type == COMPILATION_TYPE_EVAL) {
     return "eval";
+  }
   return null;
 };
 
 CallSite.prototype.getMethodName = function () {
   // See if we can find a unique property on the receiver that holds
   // this function.
   var ownName = this.fun.name;
   if (ownName && this.receiver &&
       (%_CallFunction(this.receiver, ownName, ObjectLookupGetter) === this.fun ||
        %_CallFunction(this.receiver, ownName, ObjectLookupSetter) === this.fun ||
        this.receiver[ownName] === this.fun)) {
     // To handle DontEnum properties we guess that the method has
     // the same name as the function.
     return ownName;
   }
   var name = null;
   for (var prop in this.receiver) {
     if (this.receiver.__lookupGetter__(prop) === this.fun ||
         this.receiver.__lookupSetter__(prop) === this.fun ||
         (!this.receiver.__lookupGetter__(prop) && this.receiver[prop] === this.fun)) {
       // If we find more than one match bail out to avoid confusion.
-      if (name)
+      if (name) {
         return null;
+      }
       name = prop;
     }
   }
-  if (name)
+  if (name) {
     return name;
+  }
   return null;
 };
 
 CallSite.prototype.getFileName = function () {
   var script = %FunctionGetScript(this.fun);
   return script ? script.name : null;
 };
 
 CallSite.prototype.getLineNumber = function () {
-  if (this.pos == -1)
+  if (this.pos == -1) {
     return null;
+  }
   var script = %FunctionGetScript(this.fun);
   var location = null;
   if (script) {
     location = script.locationFromPosition(this.pos, true);
   }
   return location ? location.line + 1 : null;
 };
 
 CallSite.prototype.getColumnNumber = function () {
-  if (this.pos == -1)
+  if (this.pos == -1) {
     return null;
+  }
   var script = %FunctionGetScript(this.fun);
   var location = null;
   if (script) {
     location = script.locationFromPosition(this.pos, true);
   }
   return location ? location.column + 1: null;
 };
 
 CallSite.prototype.isNative = function () {
   var script = %FunctionGetScript(this.fun);
   return script ? (script.type == TYPE_NATIVE) : false;
 };
 
 CallSite.prototype.getPosition = function () {
   return this.pos;
 };
 
 CallSite.prototype.isConstructor = function () {
   var constructor = this.receiver ? this.receiver.constructor : null;
-  if (!constructor)
+  if (!constructor) {
     return false;
+  }
   return this.fun === constructor;
 };
 
 function FormatEvalOrigin(script) {
   var sourceURL = script.nameOrSourceURL();
-  if (sourceURL)
+  if (sourceURL) {
     return sourceURL;
+  }
 
   var eval_origin = "eval at ";
   if (script.eval_from_function_name) {
     eval_origin += script.eval_from_function_name;
   } else {
     eval_origin +=  "<anonymous>";
   }
 
   var eval_from_script = script.eval_from_script;
   if (eval_from_script) {
@@ skipping 177 matching lines @@
       captureStackTrace(this, f);
     } else {
       return new f(m);
     }
   });
 }
 
 function captureStackTrace(obj, cons_opt) {
   var stackTraceLimit = $Error.stackTraceLimit;
   if (!stackTraceLimit || !IS_NUMBER(stackTraceLimit)) return;
-  if (stackTraceLimit < 0 || stackTraceLimit > 10000)
+  if (stackTraceLimit < 0 || stackTraceLimit > 10000) {
     stackTraceLimit = 10000;
+  }
   var raw_stack = %CollectStackTrace(cons_opt
                                      ? cons_opt
                                      : captureStackTrace, stackTraceLimit);
   DefineOneShotAccessor(obj, 'stack', function (obj) {
     return FormatRawStackTrace(obj, raw_stack);
   });
 };
 
 $Math.__proto__ = global.Object.prototype;
 
@@ skipping 53 matching lines @@
   }
   // This helper function is needed because access to properties on
   // the builtins object do not work inside of a catch clause.
   function isCyclicErrorMarker(o) { return o === cyclic_error_marker; }
 
   try {
     return %_CallFunction(this, errorToStringDetectCycle);
   } catch(e) {
     // If this error message was encountered already return the empty
     // string for it instead of recursively formatting it.
-    if (isCyclicErrorMarker(e)) return '';
-    else throw e;
+    if (isCyclicErrorMarker(e)) {
+      return '';
+    }
+    throw e;
   }
 }
 
 
 InstallFunctions($Error.prototype, DONT_ENUM, ['toString', errorToString]);
 
 // Boilerplate for exceptions for stack overflows. Used from
 // Isolate::StackOverflow().
 const kStackOverflowBoilerplate = MakeRangeError('stack_overflow', []);