Replace PushIfAbsent by a Stack object

src/js/json.js

Index: src/js/json.js
diff --git a/src/js/json.js b/src/js/json.js
index ddd081bab11bf7dfa5c0fcef7385c247e56443f3..c6dbed9cbbf7f0923bc446387f6f9c7f700f8d27 100644
--- a/src/js/json.js
+++ b/src/js/json.js
@@ -19,6 +19,10 @@ var MakeTypeError;
 var MaxSimple;
 var MinSimple;
 var ObjectHasOwnProperty;
+var Stack;
+var StackHas;
+var StackPop;
+var StackPush;
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 utils.Import(function(from) {
@@ -26,6 +30,10 @@ utils.Import(function(from) {
   MaxSimple = from.MaxSimple;
   MinSimple = from.MinSimple;
   ObjectHasOwnProperty = from.ObjectHasOwnProperty;
+  Stack = from.Stack;
+  StackHas = from.StackHas;
+  StackPop = from.StackPop;
+  StackPush = from.StackPush;
 });
 
 // -------------------------------------------------------------------
@@ -78,7 +86,8 @@ function JSONParse(text, reviver) {
 
 
 function SerializeArray(value, replacer, stack, indent, gap) {
-  if (!%PushIfAbsent(stack, value)) throw MakeTypeError(kCircularStructure);
+  if (StackHas(stack, value)) throw MakeTypeError(kCircularStructure);
+  StackPush(stack, value);
   var stepback = indent;
   indent += gap;
   var partial = new InternalArray();
@@ -101,13 +110,14 @@ function SerializeArray(value, replacer, stack, indent, gap) {
   } else {
     final = "[]";
   }
-  stack.pop();
+  StackPop(stack);
   return final;
 }
 
 
 function SerializeObject(value, replacer, stack, indent, gap) {
-  if (!%PushIfAbsent(stack, value)) throw MakeTypeError(kCircularStructure);
+  if (StackHas(stack, value)) throw MakeTypeError(kCircularStructure);
+  StackPush(stack, value);
   var stepback = indent;
   indent += gap;
   var partial = new InternalArray();
@@ -146,7 +156,7 @@ function SerializeObject(value, replacer, stack, indent, gap) {
   } else {
     final = "{}";
   }
-  stack.pop();
+  StackPop(stack);
   return final;
 }
 
@@ -241,7 +251,7 @@ function JSONStringify(value, replacer, space) {
   if (!IS_CALLABLE(replacer) && !property_list && !gap && !IS_PROXY(value)) {
     return %BasicJSONStringify(value);
   }
-  return JSONSerialize('', {'': value}, replacer, new InternalArray(), "", gap);
+  return JSONSerialize('', {'': value}, replacer, new Stack(), "", gap);
 }
 
 // -------------------------------------------------------------------
@@ -279,7 +289,7 @@ function JsonSerializeAdapter(key, object) {
   var holder = {};
   holder[key] = object;
   // No need to pass the actual holder since there is no replacer function.
-  return JSONSerialize(key, holder, UNDEFINED, new InternalArray(), "", "");
+  return JSONSerialize(key, holder, UNDEFINED, new Stack(), "", "");
 }
 
 %InstallToContext(["json_serialize_adapter", JsonSerializeAdapter]);