Catch stack overflow in JSON.parse.

src/json-parser.h

 // Copyright 2011 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 177 matching lines @@
   if (seq_ascii) {
     seq_source_ = Handle<SeqAsciiString>::cast(source_);
   }
 
   // Set initial position right before the string.
   position_ = -1;
   // Advance to the first character (possibly EOS)
   AdvanceSkipWhitespace();
   Handle<Object> result = ParseJsonValue();
   if (result.is_null() || c0_ != kEndOfString) {
+    // Some exception (for example stack overflow) is already pending.
+    if (isolate_->has_pending_exception()) return Handle<Object>::null();
+
     // Parse failed. Current character is the unexpected token.
-
     const char* message;
     Factory* factory = this->factory();
     Handle<JSArray> array;
 
     switch (c0_) {
       case kEndOfString:
         message = "unexpected_eos";
         array = factory->NewJSArray(0);
         break;
       case '-':
@@ skipping 30 matching lines @@
     isolate()->Throw(*result, &location);
     return Handle<Object>::null();
   }
   return result;
 }
 
 
 // Parse any JSON value.
 template <bool seq_ascii>
 Handle<Object> JsonParser<seq_ascii>::ParseJsonValue() {
+  StackLimitCheck stack_check(isolate_);
+  if (stack_check.HasOverflowed()) {
+    isolate_->StackOverflow();
+    return Handle<Object>::null();
+  }
+
   if (c0_ == '"') return ParseJsonString();
   if ((c0_ >= '0' && c0_ <= '9') || c0_ == '-') return ParseJsonNumber();
   if (c0_ == '{') return ParseJsonObject();
   if (c0_ == '[') return ParseJsonArray();
   if (c0_ == 'f') {
     if (AdvanceGetChar() == 'a' && AdvanceGetChar() == 'l' &&
         AdvanceGetChar() == 's' && AdvanceGetChar() == 'e') {
       AdvanceSkipWhitespace();
       return factory()->false_value();
     }
@@ skipping 416 matching lines @@
   }
   ASSERT_EQ('"', c0_);
   // Advance past the last '"'.
   AdvanceSkipWhitespace();
   return result;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSON_PARSER_H_