Preparser extracted into separate files that can be compiled to a library.

src/parser.h

 // Copyright 2010 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 528 matching lines @@
   ZoneList<Expression*>* ParseArguments(bool* ok);
   FunctionLiteral* ParseFunctionLiteral(Handle<String> var_name,
                                         int function_token_position,
                                         FunctionLiteralType type,
                                         bool* ok);
 
 
   // Magical syntax support.
   Expression* ParseV8Intrinsic(bool* ok);
 
-  INLINE(Token::Value peek()) { return scanner_.peek(); }
-  INLINE(Token::Value Next()) { return scanner_.NextCheckStack(); }
+  INLINE(Token::Value peek()) {
+    if (stack_overflow_) return Token::ILLEGAL;
+    return scanner_.peek();
+  }
+
+  INLINE(Token::Value Next()) {
+    // BUG 1215673: Find a thread safe way to set a stack limit in
+    // pre-parse mode. Otherwise, we cannot safely pre-parse from other
+    // threads.
+    if (stack_overflow_) {
+      return Token::ILLEGAL;
+    }
+    if (StackLimitCheck().HasOverflowed()) {
+      // Any further calls to Next or peek will return the illegal token.
+      stack_overflow_ = true;
+    }
+    return scanner_.Next();
+  }
+
   INLINE(void Consume(Token::Value token));
   void Expect(Token::Value token, bool* ok);
   bool Check(Token::Value token);
   void ExpectSemicolon(bool* ok);
 
   Handle<String> GetSymbol(bool* ok);
 
   // Get odd-ball literals.
   Literal* GetLiteralUndefined();
   Literal* GetLiteralTheHole();
@@ skipping 71 matching lines @@
 
   TemporaryScope* temp_scope_;
   Mode mode_;
 
   Target* target_stack_;  // for break, continue statements
   bool allow_natives_syntax_;
   v8::Extension* extension_;
   bool is_pre_parsing_;
   ScriptDataImpl* pre_data_;
   FuncNameInferrer* fni_;
+  bool stack_overflow_;
 };
 
 
 // Support for handling complex values (array and object literals) that
 // can be fully handled at compile time.
 class CompileTimeValue: public AllStatic {
  public:
   enum Type {
     OBJECT_LITERAL_FAST_ELEMENTS,
     OBJECT_LITERAL_SLOW_ELEMENTS,
@@ skipping 59 matching lines @@
   // it allow a terminal comma, like a JavaScript array does.
   Handle<Object> ParseJsonArray();
 
   // Mark that a parsing error has happened at the current token, and
   // return a null handle. Primarily for readability.
   Handle<Object> ReportUnexpectedToken() { return Handle<Object>::null(); }
   // Converts the currently parsed literal to a JavaScript String.
   Handle<String> GetString();
 
   JsonScanner scanner_;
+  bool stack_overflow_;
 };
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_