[antlr-interest] bug with composite grammars in C runtime?

[Robert Soule]

Hi Jim,

I am trying to follow your suggestion of defining literals in a
separate lexer grammar,
and then importing them into my main grammar. I am getting a runtime
error, and I'm
not sure if I specified something wrong. Below are the files that
generate the error.

Here is the Helper.g:

lexer grammar Helper;
options {language = C;}
SEMI : ',';

and my A.g:

grammar A;
options { language=C; output=AST; }
import Helper;

tokens { PROGRAM; }
accept : SEMI EOF -> PROGRAM;
WHITE_SPACE      : (' '|'\t'|'\r'|'\n')+                     {
$channel = HIDDEN; };

When I run this, I get a bus error:
0x00000000 in ?? ()
(gdb) where
#0  0x00000000 in ?? ()
#1  0x000239cf in setCharStream ()
#2  0x00023abe in antlr3LexerNewStream ()
#3  0x00002868 in A_HelperNewSSD (instream=0x100180, state=0x100570,
gA=0x100460) at A_Helper.cpp:318
#4  0x00001a14 in ALexerNewSSD (instream=0x100180, state=0x0) at ALexer.cpp:352
#5  0x00001a45 in ALexerNew (instream=0x100180) at ALexer.cpp:285
#6  0x000029df in main (argc=2, argv=0xbffff110) at AtoB.cpp:30
(gdb)


The line A_Helper.cpp:318:

   ctx->pLexer  = antlr3LexerNewStream(ANTLR3_SIZE_HINT, instream, state);

And the driver:

#include <iostream>
#include <antlr3.h>
#include <AParser.h>
#include <ALexer.h>

int main(int argc, char* argv[])
{

  pANTLR3_INPUT_STREAM input;
  pALexer lex;
  input  = antlr3AsciiFileStreamNew((pANTLR3_UINT8)argv[1]);
  lex    = ALexerNew(input);

}

Am I using the import wrong?

thanks,
Robert