[antlr-interest] beginner help - Mac OSX trouble?

[mzukowski at yci.com]

You have to initialize the AST factory, something like this:

 ANTLR_USE_NAMESPACE(antlr)ASTFactory my_factory;
  initializeASTFactory(my_factory);
  setASTFactory(&my_factory);

Monty

-----Original Message-----
From: kurtschwehr [mailto:kurtschwehr at yahoo.com] 
Sent: Monday, July 28, 2003 11:44 AM
To: antlr-interest at yahoogroups.com
Subject: [antlr-interest] beginner help - Mac OSX trouble?


Hey All,

Could someone please tell me what I'm doing wrong in this C++ simple parser?
Is it 
something I did or trouble with Mac OSX 10.2.6.  I'm also using gcc 3.1.

Thanks!
-kurt


from gdb:

(1+1)

Program received signal EXC_BAD_ACCESS, Could not access memory.
antlr::ASTFactory::create(antlr::RefCount<antlr::Token>) (this=0x0, tok={ref
= 0x2e6960}) at /usr/include/gcc/darwin/3.1/g++-v3/bits/stl_iterator.h:584

(gdb) bt
#0  antlr::ASTFactory::create(antlr::RefCount<antlr::Token>)
(this=0x0, tok={ref = 0x2e6960}) at
/usr/include/gcc/darwin/3.1/g++-v3/bits/stl_iterator.h:584
#1  0x00004770 in CalcParser::expr() (this=0xbffff9a0) at CalcParser.cpp:40
#2  0x00005128 in main (argc=1, argv=0xbffffab4) at main.C:16 #3  0x00002940
in _start (argc=1, argv=0xbffffab4, envp=0xbffffabc) at
/SourceCache/Csu/Csu-45/crt.c:267 #4  0x000027c0 in start ()

from CalcParser::expr():
                tmp1_AST = astFactory->create(LT(1));


And here is the code:

main.C:


int main(int argc, char **argv)
{
  try {
    CalcLexer lexer(cin);
    CalcParser parser(lexer);
    parser.expr();
    RefAST t = parser.getAST();
    cout << t->toStringList() << endl;
  } catch(exception& e) {
       cerr << "exception: " << e.what() << endl;
  }
}


calc.g:

options
{
  language="Cpp";
}
class CalcLexer extends Lexer;
public
INTEGER: (DIGIT)+;
LPAREN: '(';
RPAREN: ')';
PLUS: '+';
protected
DIGIT: '0'..'9';

class CalcParser extends Parser;
options
{
  buildAST=true;
}
expr: LPAREN INTEGER (PLUS INTEGER)* RPAREN;


 

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