Shorten autogenerated error message for functions only.

R=yangguo@chromium.org, Yang, rossberg@chromium.org
BUG=v8:3019, chromium:331971
LOG=Y

Review URL: https://codereview.chromium.org/271733005

Patch from Andrey Adaykin <aandrey@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21224 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/messages.js

@@ -177,10 +177,6 @@ function FormatString(format, args) {
         // 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";
@@ -200,10 +196,17 @@ function FormatString(format, args) {
 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") {

test/mjsunit/error-tostring-omit.js

@@ -37,23 +37,15 @@ function veryLongString() {
          "Nam accumsan dignissim turpis a turpis duis.";
 }
 
+assertTrue(veryLongString().length > 256);
 
-var re = /omitted/;
+var re = /...<omitted>.../;
 
 try {
-  veryLongString.nonexistentMethod();
+  Number.prototype.toFixed.call(veryLongString);
 } catch (e) {
-  assertTrue(e.message.length < 350);
-  // TODO(verwaest): Proper error message.
-  // assertTrue(re.test(e.message));
-}
-
-try {
-  veryLongString().nonexistentMethod();
-} catch (e) {
-  assertTrue(e.message.length < 350);
-  // TODO(verwaest): Proper error message.
-  // assertTrue(re.test(e.message));
+  assertTrue(e.message.length < 256);
+  assertTrue(re.test(e.message));
 }
 
 try {