Return MaybeHandle from JsonParser.

src/runtime.cc

 // 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
@@ skipping 9751 matching lines @@
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_ParseJson) {
   HandleScope scope(isolate);
   ASSERT_EQ(1, args.length());
   CONVERT_ARG_HANDLE_CHECKED(String, source, 0);
 
   source = Handle<String>(FlattenGetString(source));
   // Optimized fast case where we only have ASCII characters.
   Handle<Object> result;
-  if (source->IsSeqOneByteString()) {
-    result = JsonParser<true>::Parse(source);
-  } else {
-    result = JsonParser<false>::Parse(source);
-  }
-  if (result.is_null()) {
-    // Syntax error or stack overflow in scanner.
-    ASSERT(isolate->has_pending_exception());
-    return Failure::Exception();
-  }
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result,
+      source->IsSeqOneByteString() ? JsonParser<true>::Parse(source)
+                                   : JsonParser<false>::Parse(source));
   return *result;
 }
 
 
 bool CodeGenerationFromStringsAllowed(Isolate* isolate,
                                       Handle<Context> context) {
   ASSERT(context->allow_code_gen_from_strings()->IsFalse());
   // Check with callback if set.
   AllowCodeGenerationFromStringsCallback callback =
       isolate->allow_code_gen_callback();
@@ skipping 5439 matching lines @@
   }
 }
 
 
 void Runtime::OutOfMemory() {
   Heap::FatalProcessOutOfMemory("CALL_AND_RETRY_LAST", true);
   UNREACHABLE();
 }
 
 } }  // namespace v8::internal