Shorten autogenerated error message for functions only.

src/messages.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // -------------------------------------------------------------------
 
 var kMessages = {
   // Error
   cyclic_proto:                  ["Cyclic __proto__ value"],
   code_gen_from_strings:         ["%0"],
@@ skipping 159 matching lines @@
   var arg_num = 0;
   for (var i = 0; i < format.length; i++) {
     var str = format[i];
     if (str.length == 2 && %_StringCharCodeAt(str, 0) == 0x25) {
       // Two-char string starts with "%".
       var arg_num = (%_StringCharCodeAt(str, 1) - 0x30) >>> 0;
       if (arg_num < 4) {
         // str is one of %0, %1, %2 or %3.
         try {
           str = NoSideEffectToString(args[arg_num]);
-          if (str.length > 256) {
-            str = %_SubString(str, 0, 239) + "...<omitted>..." +
-                  %_SubString(str, str.length - 2, str.length);
-          }
         } catch (e) {
           if (%IsJSModule(args[arg_num]))
             str = "module";
           else if (IS_SPEC_OBJECT(args[arg_num]))
             str = "object";
           else
             str = "#<error>";
         }
       }
     }
     result += str;
   }
   return result;
 }
 
 
 function NoSideEffectToString(obj) {
   if (IS_STRING(obj)) return obj;
   if (IS_NUMBER(obj)) return %_NumberToString(obj);
-  if (IS_BOOLEAN(obj)) return x ? 'true' : 'false';
+  if (IS_BOOLEAN(obj)) return obj ? 'true' : 'false';
   if (IS_UNDEFINED(obj)) return 'undefined';
   if (IS_NULL(obj)) return 'null';
-  if (IS_FUNCTION(obj)) return  %_CallFunction(obj, FunctionToString);
+  if (IS_FUNCTION(obj)) {
+    var str = %_CallFunction(obj, FunctionToString);
+    if (str.length > 128) {
+      str = %_SubString(str, 0, 111) + "...<omitted>..." +
+            %_SubString(str, str.length - 2, str.length);
+    }
+    return str;
+  }
   if (IS_OBJECT(obj) && %GetDataProperty(obj, "toString") === ObjectToString) {
     var constructor = %GetDataProperty(obj, "constructor");
     if (typeof constructor == "function") {
       var constructorName = constructor.name;
       if (IS_STRING(constructorName) && constructorName !== "") {
         return "#<" + constructorName + ">";
       }
     }
   }
   if (CanBeSafelyTreatedAsAnErrorObject(obj)) {
@@ skipping 1113 matching lines @@
     return result;
   };
 
   %DefineOrRedefineAccessorProperty(
       boilerplate, 'stack', getter, setter, DONT_ENUM);
 
   return boilerplate;
 }
 
 var kStackOverflowBoilerplate = SetUpStackOverflowBoilerplate();