Experimental scanner: keep track of which strings / identifiers contain an escape.

src/lexer/experimental-scanner.h

 // Copyright 2013 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 170 matching lines @@
   }
   void clear_octal_position() { }  // FIXME
 
   // Seek forward to the given position. This operation works for simple cases
   // such as seeking forward until simple delimiter tokens, which is what it is
   // used for. After this call, we will have the token at the given position as
   // the "next" token. The "current" token will be invalid. FIXME: for utf-8,
   // we need to decide if pos is counted in characters or in bytes.
   virtual void SeekForward(int pos) = 0;
 
-  // Scans the input as a regular expression pattern, previous
-  // character(s) must be /(=). Returns true if a pattern is scanned.
+  // Scans the input as a regular expression pattern, previous character(s) must
+  // be /(=). Returns true if a pattern is scanned. FIXME: this won't work for
+  // utf-8 newlines.
   virtual bool ScanRegExpPattern(bool seen_equal) = 0;
   // Returns true if regexp flags are scanned (always since flags can
   // be empty).
   virtual bool ScanRegExpFlags() = 0;
 
  protected:
   struct TokenDesc {
     Token::Value token;
     int beg_pos;
     int end_pos;
+    bool has_escapes;
   };
 
   virtual void Scan() = 0;
   virtual void SetBufferBasedOnHandle() = 0;
 
   static void UpdateBuffersAfterGC(v8::Isolate*, GCType, GCCallbackFlags);
 
   Isolate* isolate_;
   UnicodeCache* unicode_cache_;
 
@@ skipping 176 matching lines @@
       i++;
     }
   }
   return i == 6;
 }
 
 
 } }
 
 #endif  // V8_LEXER_EXPERIMENTAL_SCANNER_H