Reimplement a simpler version of JSON.stringify.

BUG=

Review URL: https://chromiumcodereview.appspot.com/11186025

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12760 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/json.js

@@ -307,10 +307,12 @@ function BasicJSONSerialize(key, value, stack, builder) {
 
 function JSONStringify(value, replacer, space) {
   if (%_ArgumentsLength() == 1) {
+    var result = %BasicJSONStringify(value);
+    if (result != 0) return result;
     var builder = new InternalArray();
     BasicJSONSerialize('', value, new InternalArray(), builder);
     if (builder.length == 0) return;
-    var result = %_FastAsciiArrayJoin(builder, "");
+    result = %_FastAsciiArrayJoin(builder, "");
     if (!IS_UNDEFINED(result)) return result;
     return %StringBuilderConcat(builder, builder.length, "");
   }

src/runtime.cc

@@ -46,6 +46,7 @@
 #include "isolate-inl.h"
 #include "jsregexp.h"
 #include "json-parser.h"
+#include "json-stringifier.h"
 #include "liveedit.h"
 #include "liveobjectlist-inl.h"
 #include "misc-intrinsics.h"
@@ -5760,6 +5761,14 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_QuoteJSONStringArray) {
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_BasicJSONStringify) {
+  ASSERT(args.length() == 1);
+  HandleScope scope(isolate);
+  BasicJsonStringifier stringifier(isolate);
+  return stringifier.Stringify(Handle<Object>(args[0]));
+}
+
+
 RUNTIME_FUNCTION(MaybeObject*, Runtime_StringParseInt) {
   NoHandleAllocation ha;
 

src/runtime.h

@@ -120,6 +120,7 @@ namespace internal {
   F(CharFromCode, 1, 1) \
   F(URIEscape, 1, 1) \
   F(URIUnescape, 1, 1) \
+  F(BasicJSONStringify, 1, 1) \
   F(QuoteJSONString, 1, 1) \
   F(QuoteJSONStringComma, 1, 1) \
   F(QuoteJSONStringArray, 1, 1) \

test/mjsunit/json-recursive.js

+// Copyright 2012 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.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+var a = {};
+for (i = 0; i < 10000; i++) {
+  var current = {};
+  current.a = a;
+  a = current;
+}
+
+function rec(a,b,c,d,e,f,g,h,i,j,k,l,m,n) {
+  JSON.stringify(a);
+  rec(a,b,c,d,e,f,g,h,i,j,k,l,m,n);
+}
+
+assertThrows(
+    function() { rec(1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4) },
+    RangeError);
+

test/mjsunit/json.js

@@ -257,6 +257,39 @@ assertEquals("[1,2,[3,[4],5],6,7]",
 assertEquals("[2,4,[6,[8],10],12,14]",
              JSON.stringify([1, 2, [3, [4], 5], 6, 7], DoubleNumbers));
 assertEquals('["a","ab","abc"]', JSON.stringify(["a","ab","abc"]));
+assertEquals('{"a":1,"c":true}',
+              JSON.stringify({ a : 1,
+                               b : function() { 1 },
+                               c : true,
+                               d : function() { 2 } }));
+assertEquals('[1,null,true,null]',
+             JSON.stringify([1, function() { 1 }, true, function() { 2 }]));
+assertEquals('"toJSON 123"',
+             JSON.stringify({ toJSON : function() { return 'toJSON 123'; } }));
+assertEquals('{"a":321}',
+             JSON.stringify({ a : { toJSON : function() { return 321; } } }));
+assertEquals('{"getter":123}',
+             JSON.stringify({ get getter() { return 123; } }));
+assertEquals('{"a":"abc","b":"\u1234bc"}',
+             JSON.stringify({ a : "abc", b : "\u1234bc" }));
+
+var a = { a : 1, b : 2 };
+delete a.a;
+assertEquals('{"b":2}', JSON.stringify(a));
+
+var b = {};
+b.__proto__ = { toJSON : function() { return 321;} };
+assertEquals("321", JSON.stringify(b));
+
+var array = [""];
+var expected = '""';
+for (var i = 0; i < 10000; i++) {
+  array.push("");
+  expected = '"",' + expected;
+}
+expected = '[' + expected + ']';
+assertEquals(expected, JSON.stringify(array));
+
 
 var circular = [1, 2, 3];
 circular[2] = circular;
@@ -428,5 +461,6 @@ var o = JSON.parse('{"__proto__":5}');
 assertEquals(Object.prototype, o.__proto__);  // __proto__ isn't changed.
 assertEquals(0, Object.keys(o).length);  // __proto__ isn't added as enumerable.
 
+
 var json = '{"stuff before slash\\\\stuff after slash":"whatever"}';
 assertEquals(json, JSON.stringify(JSON.parse(json)));