Preserve C/C++ comments in ANTLR v3

I need to extract comments from C/C++/Java source file.  Normally
comments
are thrown away and they are defined as lexer rules (in ANTLR v3):

  // Single-line comments
  SL_COMMENT
    : '//' ( ~('\r'|'\n')* ) '\r'? '\n' {skip();}
    ;

  // Multi-line comments
  ML_COMMENT
    : '/*' (options {greedy=false;} : .)* '*/' {skip();}
    ;

Basically I need something like this:

  comment : sl_comment | ml_comment ;

  sl_comment : '//' COMMENT_LINE ;

  ml_comment : '/*' COMMENT_TEXT '*/' ;

How do I define COMMENT_LINE and COMMENT_TEXT?  Especially if I am
ignoring
whitespace, it becomes more confusing.

Any hints or pointers would be appreciated,
-- Amal