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The ANTLR 3 tool.
There is a newer version: 3.5.3
/*
 [The "BSD license"]
 Copyright (c) 2005-2009 Jim Idle, Temporal Wave LLC
 http://www.temporal-wave.com
 http://www.linkedin.com/in/jimidle

 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
 2. 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 with the distribution.
 3. The name of the author may not be used to endorse or promote products
    derived from this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** Template overrides to add debugging to normal C output;
 *  If ASTs are built, then you'll also get ASTDbg.stg loaded.
 */
@genericParser.members() ::= <<

const char *
ruleNames[] =
	{
		"invalidRule", "}; wrap="\n		", separator=", ">
	};<\n>

 
static ANTLR3_UINT32 ruleLevel = 0;
static ANTLR3_UINT32 getRuleLevel()
{
	return ruleLevel;
}
static void incRuleLevel()
{
	ruleLevel++;
}
static void decRuleLevel()
{
	ruleLevel--;
}
 
static ANTLR3_UINT32
getRuleLevel()
{
	return }>->getRuleLevel();
}
static void incRuleLevel()
{
	}>->incRuleLevel();
}
static void
decRuleLevel()
{
	}>.decRuleLevel();
}


// Profiling not yet implemented for C target
//







static ANTLR3_BOOLEAN
evalPredicate(p ctx, ANTLR3_BOOLEAN result, const char * predicate)
{
    DBG->semanticPredicate(DBG, result, predicate);
    return result;
}<\n>
>>

@genericParser.debugStuff() ::= <<



>>

ctorForProfilingRootGrammar() ::= <<
>>

/** Basically we don't want to set any dbg listeners as root will have it. */
ctorForDelegateGrammar() ::= <<

>>

ctorForPredefinedListener() ::= <<

>>

createListenerAndHandshake() ::= <<
{
	// DEBUG MODE code
	//
	pANTLR3_DEBUG_EVENT_LISTENER	 proxy;
	proxy = antlr3DebugListenerNew();
	proxy->grammarFileName = INPUT->tokenSource->strFactory->newStr8(INPUT->tokenSource->strFactory, (pANTLR3_UINT8)ctx->getGrammarFileName());


	proxy->adaptor = ADAPTOR;

	PARSER->setDebugListener(PARSER, proxy);

	// Try to connect to the debugger (waits forever for a connection)
	//
	proxy->handshake(proxy);

	// End DEBUG MODE code
	//
}
>>


@rule.preamble() ::= <<
if ( getRuleLevel()==0 )
{
	DBG->commence(DBG);
}
DBG->enterRule(DBG, getGrammarFileName(), (const char *)"");
incRuleLevel();
DBG->location(DBG, , );<\n>
>>

@rule.postamble() ::= <<
DBG->location(DBG, , );<\n>
DBG->exitRule(DBG, getGrammarFileName(), (const char *)"");
decRuleLevel();
if ( getRuleLevel()==0 )
{
	DBG->terminate(DBG);
}
<\n>
>>

@checkRuleBacktrackFailure.debugClean() ::= <<
DBG->exitRule(DBG, getGrammarFileName(), (const char *)"");
decRuleLevel();
>>

@synpred.start() ::= "DBG->beginBacktrack(DBG, BACKTRACKING);"

@synpred.stop() ::= "DBG->endBacktrack(DBG, BACKTRACKING, success);"

// Common debug event triggers used by region overrides below

enterSubRule() ::=
    "DBG->enterSubRule(DBG, );<\n>"

exitSubRule() ::=
    "DBG->exitSubRule(DBG, );<\n>"

enterDecision() ::=
    "DBG->enterDecision(DBG, );<\n>"

exitDecision() ::=
    "DBG->exitDecision(DBG, );<\n>"

enterAlt(n) ::= "DBG->enterAlt(DBG, );<\n>"

// Region overrides that tell various constructs to add debugging triggers

@block.predecision() ::= ""

@block.postdecision() ::= ""

@block.postbranch() ::= ""

@ruleBlock.predecision() ::= ""

@ruleBlock.postdecision() ::= ""

@ruleBlockSingleAlt.prealt() ::= ""

@blockSingleAlt.prealt() ::= ""

@positiveClosureBlock.preloop() ::= ""

@positiveClosureBlock.postloop() ::= ""

@positiveClosureBlock.predecision() ::= ""

@positiveClosureBlock.postdecision() ::= ""

@positiveClosureBlock.earlyExitException() ::=
    "DBG->recognitionException(DBG, EXCEPTION);<\n>"

@closureBlock.preloop() ::= ""

@closureBlock.postloop() ::= ""

@closureBlock.predecision() ::= ""

@closureBlock.postdecision() ::= ""

@altSwitchCase.prealt() ::= ""

@element.prematch() ::=
    "DBG->location(DBG, , );" // e is arg of element

@matchSet.mismatchedSetException() ::=
    "DBG->recognitionException(DBG, EXCEPTION);"

@newNVException.noViableAltException() ::= "DBG->recognitionException(DBG, EXCEPTION);"

dfaDecision(decisionNumber,description) ::= <<
alt = cdfa.predict(ctx, RECOGNIZER, ISTREAM, &cdfa);
if  (HASEXCEPTION())
{
	DBG->recognitionException(DBG, EXCEPTION);
    goto ruleEx;
}

>>

@cyclicDFA.errorMethod() ::= <<
//static void
//dfaError(p ctx)
//{
//    DBG->recognitionException(DBG, EXCEPTION);
//}
>>

/** Force predicate validation to trigger an event */
evalPredicate(pred,description) ::= <<
evalPredicate(ctx, , (const char *)"")
>>