[splint.git] / src / loopHeuristics.c

/*
** Splint - annotation-assisted static program checker
** Copyright (C) 1994-2002 University of Virginia,
**         Massachusetts Institute of Technology
**
** This program is free software; you can redistribute it and/or modify it
** under the terms of the GNU General Public License as published by the
** Free Software Foundation; either version 2 of the License, or (at your
** option) any later version.
** 
** This program is distributed in the hope that it will be useful, but
** WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
** General Public License for more details.
** 
** The GNU General Public License is available from http://www.gnu.org/ or
** the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
** MA 02111-1307, USA.
**
** For information on splint: info@splint.org
** To report a bug: splint-bug@splint.org
** For more information: http://www.splint.org
*/

/*
** loopHeuristics.c
*/

/*This file was formerly called forjunk.c C
  renamed Oct 8, 2001 - DRL
*/

/* #define DEBUGPRINT 1 */

# include <ctype.h> /* for isdigit */
# include "splintMacros.nf"
# include "basic.h"
# include "cgrammar.h"
# include "cgrammar_tokens.h"

# include "exprChecks.h"
# include "exprNodeSList.h"

/*@access constraint, exprNode @*/  /* !!! NO! */

/*@access constraintExpr @*/ /* !!! NO! */

/*@-nullderef@*/ /* !!! DRL needs to fix this code! */
/*@-nullstate@*/ /* !!! DRL needs to fix this code! */
/*@-nullpass@*/ /* !!! DRL needs to fix this code! */
/*@-temptrans@*/ /* !!! DRL needs to fix this code! */

static bool isInc (/*@observer@*/ constraintExpr c) /*@*/
{
  
  llassert (constraintExpr_isDefined (c) );
 if (c->kind == binaryexpr )
    {
      constraintExprBinaryOpKind binOP;
      constraintExpr t1, t2;
      t1 = constraintExprData_binaryExprGetExpr1 (c->data);
      t2 = constraintExprData_binaryExprGetExpr2 (c->data);

      binOP = constraintExprData_binaryExprGetOp (c->data);
      if (binOP == BINARYOP_PLUS)
	if (constraintExpr_isLit (t2) && constraintExpr_getValue (t2) == 1 )
	  {
	    return TRUE;
	  }
    }

 return FALSE;
}

/* look for constraints like cexrp = cexrp + 1 */
static bool incVar (/*@notnull@*/ constraint c) /*@*/
{
  constraintExpr t1;
  if (c->ar != EQ)
    {
      return FALSE;
    }
  if (! isInc (c->expr ) )
    return FALSE;

  llassert (constraintExpr_isDefined (c->expr) );
  llassert (c->expr->kind == binaryexpr);

  t1 = constraintExprData_binaryExprGetExpr1 (c->expr->data);
  if (constraintExpr_similar (c->lexpr, t1) )
    return TRUE;

  return FALSE;
}
/*@noaccess constraintExpr @*/


static bool increments (/*@observer@*/ constraint c,
			/*@observer@*/ constraintExpr var)
{
  llassert (constraint_isDefined (c) );

  if (constraint_isUndefined (c) )
    {
      return FALSE;
    }

  llassert (incVar (c));
  if (constraintExpr_similar (c->lexpr, var) )
    return TRUE;
  else
    return FALSE;
}

static bool canGetForTimes (/*@notnull@*/ exprNode forPred, /*@notnull@*/ exprNode forBody)
{
  
  exprNode init, test, inc, t1, t2;
  lltok tok;
  
  llassert (exprNode_isDefined (forPred) );
  llassert (exprNode_isDefined (forBody) );

  init  =  exprData_getTripleInit (forPred->edata);
  test  =   exprData_getTripleTest (forPred->edata);
  inc   =   exprData_getTripleInc (forPred->edata);

  llassert (exprNode_isDefined (test) );

  if (exprNode_isUndefined (test) )
    {
      return FALSE;
    }

  llassert (exprNode_isDefined (inc) );

  if (exprNode_isUndefined (inc) )
    {
      return FALSE;
    }

  if (test->kind != XPR_PREOP)
    return FALSE;
      
  tok = (exprData_getUopTok (test->edata));
  if (!lltok_isMult (tok) )
    {
      return FALSE;
    }

  /* should check preop too */
  if (inc->kind != XPR_POSTOP)
    {
      return FALSE;
    }
  
  tok = (exprData_getUopTok (inc->edata));
  if (lltok_isIncOp (tok) )
      {
	t1 = exprData_getUopNode (test->edata);
	t2 = exprData_getUopNode (inc->edata);
	llassert (exprNode_isDefined (t2) && exprNode_isDefined (t2)  );

	if (exprNode_isUndefined (t1) || exprNode_isUndefined (t2)  )
	  {
	    return FALSE;
	  }

	if (sRef_sameName (t1->sref, t2->sref) )
	  {
	    return TRUE;
	  }
      }
  return FALSE;
}

static /*@only@*/ constraintList getLessThanConstraints (/*@observer@*/ constraintList c)
{
  constraintList ret;

  ret = constraintList_makeNew ();
  constraintList_elements (c, el)
    {
      llassert (constraint_isDefined (el));
      if ( constraint_isUndefined (el)  )
      	continue;
      
      if (el->ar == LT || el->ar == LTE)
	{
	  constraint temp;
	  temp = constraint_copy (el);

	  ret = constraintList_add (ret, temp);
	}
    }
  end_constraintList_elements;

  return ret;
}

static /*@only@*/ constraintList getIncConstraints (/*@observer@*/ constraintList c)
{
  constraintList ret;

  ret = constraintList_makeNew ();
  constraintList_elements (c, el)
    {
      llassert (constraint_isDefined (el));

      if (incVar (el) )
	{
	  constraint temp;
	  temp = constraint_copy (el);
	  ret = constraintList_add (ret, temp);
	}
    }
  end_constraintList_elements;
  
  return ret;
}

static /*@only@*/ constraintExpr getForTimes (/*@notnull@*/ exprNode forPred, /*@notnull@*/ exprNode forBody)
{
  
  exprNode init, test, inc, t1, t2;
  constraintList ltCon;
  constraintList incCon;
  constraintExpr ret;
  
  lltok tok;
  
  init  =  exprData_getTripleInit (forPred->edata);
  test  =  exprData_getTripleTest (forPred->edata);
  inc   =  exprData_getTripleInc (forPred->edata);

  llassert (exprNode_isDefined (test) );
  llassert (exprNode_isDefined (inc) );
  
  ltCon =  getLessThanConstraints (test->trueEnsuresConstraints);
  incCon = getIncConstraints (inc->ensuresConstraints);
  
  DPRINTF (( message ("getForTimes: ltCon: %s from %s", constraintList_print (ltCon), constraintList_print (test->trueEnsuresConstraints) ) ));
  
  DPRINTF (( message ("getForTimes: incCon: %s from %s", constraintList_print (incCon), constraintList_print (inc->ensuresConstraints) ) ));
   
  constraintList_elements (ltCon, el) 
    {
      constraintList_elements (incCon, el2)
      {
	if ( increments (el2, el->lexpr) )
	  {
	    DPRINTF (( message ("getForTimes: %s increments %s", constraint_print (el2), constraint_print (el) ) ));
	    ret =  constraintExpr_copy (el->expr);
	    constraintList_free (ltCon);
	    constraintList_free (incCon);
	    return ret;

	  }
	else
	  {
	    ;
	    DPRINTF (( message ("getForTimes: %s doesn't increment %s", constraint_print (el2), constraint_print (el) )   ));
	  }
      }
      end_constraintList_elements;
    }

  end_constraintList_elements;

  constraintList_free (ltCon);
  constraintList_free (incCon);
  
  DPRINTF (( message ("getForTimes: %s  %s resorting to ugly hack", exprNode_unparse (forPred), exprNode_unparse (forBody) ) ));
  if (! canGetForTimes (forPred, forBody) )
    {
      return NULL;
    }


  if (test->kind != XPR_PREOP)
    llassert (FALSE);
      
  tok = (exprData_getUopTok (test->edata));
  if (!lltok_isMult (tok) )
    {
      llassert ( FALSE );
    }

  /* should check preop too */
  if (inc->kind != XPR_POSTOP)
    {
      llassert (FALSE );
    }
  
  tok = (exprData_getUopTok (inc->edata));
  if (lltok_isIncOp (tok) )
      {
	t1 = exprData_getUopNode (test->edata);
	t2 = exprData_getUopNode (inc->edata);
	if (sRef_sameName (t1->sref, t2->sref) )
	  {
	    return (constraintExpr_makeMaxSetExpr (t1) );
	  }
      }
  llassert ( FALSE);
  BADEXIT;
}

/*@access constraintExpr @*/

static /*@only@*/ constraintExpr constraintExpr_searchAndAdd (/*@only@*/ constraintExpr c, /*@observer@*/ constraintExpr find, /*@observer@*/ constraintExpr add)
{
  constraintExprKind kind;
  constraintExpr temp;

  DPRINTF (( message ("Doing constraintExpr_searchAndAdd  %s %s %s ",
		     constraintExpr_unparse (c), constraintExpr_unparse (find), constraintExpr_unparse (add) ) ) );
  
  if ( constraintExpr_similar (c, find) )
    {

      constraintExpr newExpr;
      
      cstring cPrint;
      
      cPrint = constraintExpr_unparse (c);
      
      
      newExpr = constraintExpr_makeAddExpr (c, constraintExpr_copy (add) );

      DPRINTF ((message ("Replacing %q with %q",
			cPrint, constraintExpr_unparse (newExpr)
			)));
      return newExpr;
    }

  kind = c->kind;
  
  switch (kind)
    {
    case term:
      break;      
    case unaryExpr:
      temp = constraintExprData_unaryExprGetExpr (c->data);
      temp = constraintExpr_searchAndAdd (constraintExpr_copy (temp), find, add);
      c->data = constraintExprData_unaryExprSetExpr (c->data, temp);
      break;           
    case binaryexpr:
      
      temp = constraintExprData_binaryExprGetExpr1 (c->data);
      temp = constraintExpr_searchAndAdd (constraintExpr_copy (temp), find, add);
      c->data = constraintExprData_binaryExprSetExpr1 (c->data, temp);
       
      temp = constraintExprData_binaryExprGetExpr2 (c->data);
      temp = constraintExpr_searchAndAdd (constraintExpr_copy (temp), find, add);
      c->data = constraintExprData_binaryExprSetExpr2 (c->data, temp);
      break;
    default:
      llassert (FALSE);
    }
  return c;
  
}

/*@noaccess constraintExpr @*/

static constraint  constraint_searchAndAdd (/*@returned@*/ constraint c, /*@observer@*/ constraintExpr find, /*@observer@*/ constraintExpr add)
{
  
  llassert (constraint_search (c, find)  );
  DPRINTF (( message ("Doing constraint_searchAndAdd  %s %s %s ",
		     constraint_print (c), constraintExpr_unparse (find), constraintExpr_unparse (add) ) ) );
  
  c->lexpr = constraintExpr_searchAndAdd (c->lexpr, find, add);
  c->expr =  constraintExpr_searchAndAdd (c->expr, find, add);

   c = constraint_simplify (c);
   c = constraint_simplify (c);

  return c;
  
}

 static constraintList constraintList_searchAndAdd (/*@returned@*/ constraintList list,
						   /*@observer@*/ constraintExpr find, /*@observer@*/ constraintExpr add)
{
  constraintList newConstraints;
  constraintList ret;
  
  newConstraints = constraintList_makeNew ();
  
  constraintList_elements (list, el)
    {
      if (constraint_search (el, find) )
	{
	  constraint newExpr;
	  newExpr = constraint_copy (el);

	  newExpr = constraint_searchAndAdd (newExpr, find, add);
	  	  DPRINTF (( (message ("Adding constraint %s ", constraint_print (newExpr)) )  ));
	  newConstraints = constraintList_add (newConstraints, newExpr);
	}

    }
  end_constraintList_elements;
  
  ret =  constraintList_addListFree (list, newConstraints);
  return ret;
}

static void doAdjust (/*@unused@*/ exprNode e, /*@unused@*/ exprNode forPred, /*@observer@*/ exprNode forBody, /*@observer@*/ constraintExpr iterations)
{
  
  constraintList_elements (forBody->ensuresConstraints, el)
    {
      /* look for var = var + 1 */
      if (incVar (el) )
	{
	  DPRINTF ((message ("Found inc variable constraint : %s", constraint_print (el) )  ));
	  forBody->requiresConstraints = constraintList_searchAndAdd (forBody->requiresConstraints, el->lexpr, iterations);
	}
    }
  end_constraintList_elements;
}

void exprNode_forLoopHeuristics ( exprNode e, exprNode forPred, exprNode forBody)
{
  exprNode init, test, inc;

  constraintExpr iterations;
  
  init  =  exprData_getTripleInit (forPred->edata);
  test =   exprData_getTripleTest (forPred->edata);
  inc  =   exprData_getTripleInc (forPred->edata);

  if (exprNode_isError (test) || exprNode_isError (inc) )
    return;
  
  iterations = getForTimes (forPred, forBody );

  if (constraintExpr_isDefined (iterations) )
    {
      doAdjust ( e, forPred, forBody, iterations);
      constraintExpr_free (iterations);
    }
}


/*    else */
/*      { */
/*        DPRINTF (("Can't get for time ")); */
/*      } */
  
/*    if (exprNode_isError (init) ) */
/*      { */
/*        return; */
/*      } */
  
/*    if (init->kind == XPR_ASSIGN) */
/*      { */
/*        t1 = exprData_getOpA (init->edata); */
/*        t2 = exprData_getOpB (init->edata); */
      
/*        if (! (t1->kind == XPR_VAR) ) */
/*  	return; */
/*      } */
/*    else */
/*      return; */
  
/*    if (test->kind == XPR_FETCH) */
/*      { */
/*        t3 = exprData_getPairA (test->edata); */
/*        t4 = exprData_getPairB (test->edata); */
      
/*        if (sRef_sameName (t1->sref, t4->sref) ) */
/*  	{ */
/*  	  DPRINTF ((message ("Found a for loop matching heuristic:%s", exprNode_unparse (forPred) ) )); */
/*  	  con = constraint_makeEnsureLteMaxRead (t1, t3); */
/*  	  forPred->ensuresConstraints = constraintList_add (forPred->ensuresConstraints, con);	   */
/*  	} */
/*        else */
/*  	{ */
/*  	  DPRINTF ((message ("Didn't Find a for loop matching heuristic:%s %s and %s differ", exprNode_unparse (forPred), exprNode_unparse (t1), exprNode_unparse (t3) ) )); */
/*  	} */
/*        return; */
/*      } */
Commit	Line	Data
d9900876	1	/*
11db3170	2	** Splint - annotation-assisted static program checker
77d37419	3	** Copyright (C) 1994-2002 University of Virginia,
d9900876	4	** Massachusetts Institute of Technology
	5	**
	6	** This program is free software; you can redistribute it and/or modify it
	7	** under the terms of the GNU General Public License as published by the
	8	** Free Software Foundation; either version 2 of the License, or (at your
	9	** option) any later version.
	10	**
	11	** This program is distributed in the hope that it will be useful, but
	12	** WITHOUT ANY WARRANTY; without even the implied warranty of
	13	** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	** General Public License for more details.
	15	**
	16	** The GNU General Public License is available from http://www.gnu.org/ or
	17	** the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
	18	** MA 02111-1307, USA.
	19	**
155af98d	20	** For information on splint: info@splint.org
155af98d	21	** To report a bug: splint-bug@splint.org
11db3170	22	** For more information: http://www.splint.org
d9900876	23	*/
	24
	25	/*
	26	** loopHeuristics.c
	27	*/
	28
	29	/*This file was formerly called forjunk.c C
	30	renamed Oct 8, 2001 - DRL
	31	*/
	32
	33	/* #define DEBUGPRINT 1 */
	34
	35	# include <ctype.h> /* for isdigit */
1b8ae690	36	# include "splintMacros.nf"
d9900876	37	# include "basic.h"
	38	# include "cgrammar.h"
	39	# include "cgrammar_tokens.h"
	40
	41	# include "exprChecks.h"
	42	# include "exprNodeSList.h"
	43
393e573f	44	/@access constraint, exprNode @/ /* !!! NO! */
d9900876	45
393e573f	46	/@access constraintExpr @/ /* !!! NO! */
	47
	48	/@-nullderef@/ /* !!! DRL needs to fix this code! */
	49	/@-nullstate@/ /* !!! DRL needs to fix this code! */
	50	/@-nullpass@/ /* !!! DRL needs to fix this code! */
	51	/@-temptrans@/ /* !!! DRL needs to fix this code! */
d9900876	52
	53	static bool isInc (/@observer@/ constraintExpr c) /@/
	54	{
	55
bb7c2085	56	llassert (constraintExpr_isDefined (c) );
d9900876	57	if (c->kind == binaryexpr )
	58	{
	59	constraintExprBinaryOpKind binOP;
	60	constraintExpr t1, t2;
	61	t1 = constraintExprData_binaryExprGetExpr1 (c->data);
	62	t2 = constraintExprData_binaryExprGetExpr2 (c->data);
	63
	64	binOP = constraintExprData_binaryExprGetOp (c->data);
	65	if (binOP == BINARYOP_PLUS)
	66	if (constraintExpr_isLit (t2) && constraintExpr_getValue (t2) == 1 )
	67	{
	68	return TRUE;
	69	}
	70	}
	71
	72	return FALSE;
	73	}
	74
	75	/* look for constraints like cexrp = cexrp + 1 */
	76	static bool incVar (/@notnull@/ constraint c) /@/
	77	{
	78	constraintExpr t1;
	79	if (c->ar != EQ)
	80	{
	81	return FALSE;
	82	}
	83	if (! isInc (c->expr ) )
	84	return FALSE;
	85
bb7c2085	86	llassert (constraintExpr_isDefined (c->expr) );
d9900876	87	llassert (c->expr->kind == binaryexpr);
	88
	89	t1 = constraintExprData_binaryExprGetExpr1 (c->expr->data);
	90	if (constraintExpr_similar (c->lexpr, t1) )
	91	return TRUE;
	92
	93	return FALSE;
	94	}
	95	/@noaccess constraintExpr @/
	96
	97
	98	static bool increments (/@observer@/ constraint c,
	99	/@observer@/ constraintExpr var)
	100	{
bb7c2085	101	llassert (constraint_isDefined (c) );
d9900876	102
bb7c2085	103	if (constraint_isUndefined (c) )
d9900876	104	{
	105	return FALSE;
	106	}
	107
	108	llassert (incVar (c));
	109	if (constraintExpr_similar (c->lexpr, var) )
	110	return TRUE;
	111	else
	112	return FALSE;
	113	}
	114
	115	static bool canGetForTimes (/@notnull@/ exprNode forPred, /@notnull@/ exprNode forBody)
	116	{
	117
	118	exprNode init, test, inc, t1, t2;
	119	lltok tok;
	120
bb7c2085	121	llassert (exprNode_isDefined (forPred) );
bb7c2085	122	llassert (exprNode_isDefined (forBody) );
d9900876	123
	124	init = exprData_getTripleInit (forPred->edata);
	125	test = exprData_getTripleTest (forPred->edata);
	126	inc = exprData_getTripleInc (forPred->edata);
	127
bb7c2085	128	llassert (exprNode_isDefined (test) );
d9900876	129
bb7c2085	130	if (exprNode_isUndefined (test) )
d9900876	131	{
	132	return FALSE;
	133	}
	134
bb7c2085	135	llassert (exprNode_isDefined (inc) );
d9900876	136
bb7c2085	137	if (exprNode_isUndefined (inc) )
d9900876	138	{
	139	return FALSE;
	140	}
	141
	142	if (test->kind != XPR_PREOP)
	143	return FALSE;
	144
	145	tok = (exprData_getUopTok (test->edata));
	146	if (!lltok_isMult (tok) )
	147	{
	148	return FALSE;
	149	}
	150
	151	/* should check preop too */
	152	if (inc->kind != XPR_POSTOP)
	153	{
	154	return FALSE;
	155	}
	156
	157	tok = (exprData_getUopTok (inc->edata));
16c024b5	158	if (lltok_isIncOp (tok) )
d9900876	159	{
	160	t1 = exprData_getUopNode (test->edata);
	161	t2 = exprData_getUopNode (inc->edata);
bb7c2085	162	llassert (exprNode_isDefined (t2) && exprNode_isDefined (t2) );
d9900876	163
bb7c2085	164	if (exprNode_isUndefined (t1) \|\| exprNode_isUndefined (t2) )
d9900876	165	{
	166	return FALSE;
	167	}
	168
	169	if (sRef_sameName (t1->sref, t2->sref) )
	170	{
	171	return TRUE;
	172	}
	173	}
	174	return FALSE;
	175	}
	176
	177	static /@only@/ constraintList getLessThanConstraints (/@observer@/ constraintList c)
	178	{
	179	constraintList ret;
	180
bb7c2085	181	ret = constraintList_makeNew ();
d9900876	182	constraintList_elements (c, el)
d9900876	183	{
bb7c2085	184	llassert (constraint_isDefined (el));
bb7c2085	185	if ( constraint_isUndefined (el) )
d9900876	186	continue;
	187
	188	if (el->ar == LT \|\| el->ar == LTE)
	189	{
	190	constraint temp;
bb7c2085	191	temp = constraint_copy (el);
d9900876	192
	193	ret = constraintList_add (ret, temp);
	194	}
	195	}
	196	end_constraintList_elements;
	197
	198	return ret;
	199	}
	200
	201	static /@only@/ constraintList getIncConstraints (/@observer@/ constraintList c)
	202	{
	203	constraintList ret;
	204
bb7c2085	205	ret = constraintList_makeNew ();
d9900876	206	constraintList_elements (c, el)
	207	{
	208	llassert (constraint_isDefined (el));
	209
	210	if (incVar (el) )
	211	{
	212	constraint temp;
bb7c2085	213	temp = constraint_copy (el);
d9900876	214	ret = constraintList_add (ret, temp);
	215	}
	216	}
	217	end_constraintList_elements;
	218
	219	return ret;
	220	}
	221
	222	static /@only@/ constraintExpr getForTimes (/@notnull@/ exprNode forPred, /@notnull@/ exprNode forBody)
	223	{
	224
	225	exprNode init, test, inc, t1, t2;
	226	constraintList ltCon;
	227	constraintList incCon;
	228	constraintExpr ret;
	229
	230	lltok tok;
	231
	232	init = exprData_getTripleInit (forPred->edata);
	233	test = exprData_getTripleTest (forPred->edata);
	234	inc = exprData_getTripleInc (forPred->edata);
	235
bb7c2085	236	llassert (exprNode_isDefined (test) );
bb7c2085	237	llassert (exprNode_isDefined (inc) );
d9900876	238
	239	ltCon = getLessThanConstraints (test->trueEnsuresConstraints);
	240	incCon = getIncConstraints (inc->ensuresConstraints);
	241
bb7c2085	242	DPRINTF (( message ("getForTimes: ltCon: %s from %s", constraintList_print (ltCon), constraintList_print (test->trueEnsuresConstraints) ) ));
d9900876	243
bb7c2085	244	DPRINTF (( message ("getForTimes: incCon: %s from %s", constraintList_print (incCon), constraintList_print (inc->ensuresConstraints) ) ));
d9900876	245
	246	constraintList_elements (ltCon, el)
	247	{
bb7c2085	248	constraintList_elements (incCon, el2)
d9900876	249	{
bb7c2085	250	if ( increments (el2, el->lexpr) )
d9900876	251	{
bb7c2085	252	DPRINTF (( message ("getForTimes: %s increments %s", constraint_print (el2), constraint_print (el) ) ));
d9900876	253	ret = constraintExpr_copy (el->expr);
bb7c2085	254	constraintList_free (ltCon);
bb7c2085	255	constraintList_free (incCon);
d9900876	256	return ret;
	257
	258	}
	259	else
393e573f	260	{
	261	;
	262	DPRINTF (( message ("getForTimes: %s doesn't increment %s", constraint_print (el2), constraint_print (el) ) ));
	263	}
d9900876	264	}
	265	end_constraintList_elements;
	266	}
	267
	268	end_constraintList_elements;
	269
bb7c2085	270	constraintList_free (ltCon);
bb7c2085	271	constraintList_free (incCon);
d9900876	272
bb7c2085	273	DPRINTF (( message ("getForTimes: %s %s resorting to ugly hack", exprNode_unparse (forPred), exprNode_unparse (forBody) ) ));
d9900876	274	if (! canGetForTimes (forPred, forBody) )
	275	{
	276	return NULL;
	277	}
	278
	279
	280	if (test->kind != XPR_PREOP)
	281	llassert (FALSE);
	282
	283	tok = (exprData_getUopTok (test->edata));
	284	if (!lltok_isMult (tok) )
	285	{
	286	llassert ( FALSE );
	287	}
	288
	289	/* should check preop too */
	290	if (inc->kind != XPR_POSTOP)
	291	{
	292	llassert (FALSE );
	293	}
	294
	295	tok = (exprData_getUopTok (inc->edata));
16c024b5	296	if (lltok_isIncOp (tok) )
d9900876	297	{
	298	t1 = exprData_getUopNode (test->edata);
	299	t2 = exprData_getUopNode (inc->edata);
	300	if (sRef_sameName (t1->sref, t2->sref) )
	301	{
	302	return (constraintExpr_makeMaxSetExpr (t1) );
	303	}
	304	}
bb7c2085	305	llassert ( FALSE);
d9900876	306	BADEXIT;
	307	}
	308
	309	/@access constraintExpr @/
	310
	311	static /@only@/ constraintExpr constraintExpr_searchAndAdd (/@only@/ constraintExpr c, /@observer@/ constraintExpr find, /@observer@/ constraintExpr add)
	312	{
	313	constraintExprKind kind;
	314	constraintExpr temp;
	315
bb7c2085	316	DPRINTF (( message ("Doing constraintExpr_searchAndAdd %s %s %s ",
bb7c2085	317	constraintExpr_unparse (c), constraintExpr_unparse (find), constraintExpr_unparse (add) ) ) );
d9900876	318
	319	if ( constraintExpr_similar (c, find) )
	320	{
	321
	322	constraintExpr newExpr;
	323
	324	cstring cPrint;
	325
bb7c2085	326	cPrint = constraintExpr_unparse (c);
d9900876	327
d9900876	328
bb7c2085	329	newExpr = constraintExpr_makeAddExpr (c, constraintExpr_copy (add) );
d9900876	330
bb7c2085	331	DPRINTF ((message ("Replacing %q with %q",
bb7c2085	332	cPrint, constraintExpr_unparse (newExpr)
d9900876	333	)));
	334	return newExpr;
	335	}
	336
	337	kind = c->kind;
	338
	339	switch (kind)
	340	{
	341	case term:
	342	break;
	343	case unaryExpr:
	344	temp = constraintExprData_unaryExprGetExpr (c->data);
bb7c2085	345	temp = constraintExpr_searchAndAdd (constraintExpr_copy (temp), find, add);
d9900876	346	c->data = constraintExprData_unaryExprSetExpr (c->data, temp);
	347	break;
	348	case binaryexpr:
	349
	350	temp = constraintExprData_binaryExprGetExpr1 (c->data);
bb7c2085	351	temp = constraintExpr_searchAndAdd (constraintExpr_copy (temp), find, add);
d9900876	352	c->data = constraintExprData_binaryExprSetExpr1 (c->data, temp);
	353
	354	temp = constraintExprData_binaryExprGetExpr2 (c->data);
bb7c2085	355	temp = constraintExpr_searchAndAdd (constraintExpr_copy (temp), find, add);
d9900876	356	c->data = constraintExprData_binaryExprSetExpr2 (c->data, temp);
	357	break;
	358	default:
bb7c2085	359	llassert (FALSE);
d9900876	360	}
	361	return c;
	362
	363	}
	364
	365	/@noaccess constraintExpr @/
	366
	367	static constraint constraint_searchAndAdd (/@returned@/ constraint c, /@observer@/ constraintExpr find, /@observer@/ constraintExpr add)
	368	{
	369
	370	llassert (constraint_search (c, find) );
bb7c2085	371	DPRINTF (( message ("Doing constraint_searchAndAdd %s %s %s ",
bb7c2085	372	constraint_print (c), constraintExpr_unparse (find), constraintExpr_unparse (add) ) ) );
d9900876	373
	374	c->lexpr = constraintExpr_searchAndAdd (c->lexpr, find, add);
	375	c->expr = constraintExpr_searchAndAdd (c->expr, find, add);
	376
	377	c = constraint_simplify (c);
	378	c = constraint_simplify (c);
	379
	380	return c;
	381
	382	}
	383
	384	static constraintList constraintList_searchAndAdd (/@returned@/ constraintList list,
	385	/@observer@/ constraintExpr find, /@observer@/ constraintExpr add)
	386	{
	387	constraintList newConstraints;
	388	constraintList ret;
	389
bb7c2085	390	newConstraints = constraintList_makeNew ();
d9900876	391
	392	constraintList_elements (list, el)
	393	{
	394	if (constraint_search (el, find) )
	395	{
	396	constraint newExpr;
	397	newExpr = constraint_copy (el);
	398
	399	newExpr = constraint_searchAndAdd (newExpr, find, add);
	400	DPRINTF (( (message ("Adding constraint %s ", constraint_print (newExpr)) ) ));
	401	newConstraints = constraintList_add (newConstraints, newExpr);
	402	}
	403
	404	}
	405	end_constraintList_elements;
	406
	407	ret = constraintList_addListFree (list, newConstraints);
	408	return ret;
	409	}
	410
bb7c2085	411	static void doAdjust (/@unused@/ exprNode e, /@unused@/ exprNode forPred, /@observer@/ exprNode forBody, /@observer@/ constraintExpr iterations)
d9900876	412	{
	413
	414	constraintList_elements (forBody->ensuresConstraints, el)
	415	{
	416	/* look for var = var + 1 */
bb7c2085	417	if (incVar (el) )
d9900876	418	{
bb7c2085	419	DPRINTF ((message ("Found inc variable constraint : %s", constraint_print (el) ) ));
bb7c2085	420	forBody->requiresConstraints = constraintList_searchAndAdd (forBody->requiresConstraints, el->lexpr, iterations);
d9900876	421	}
	422	}
	423	end_constraintList_elements;
	424	}
	425
bb7c2085	426	void exprNode_forLoopHeuristics ( exprNode e, exprNode forPred, exprNode forBody)
d9900876	427	{
	428	exprNode init, test, inc;
	429
	430	constraintExpr iterations;
	431
	432	init = exprData_getTripleInit (forPred->edata);
	433	test = exprData_getTripleTest (forPred->edata);
	434	inc = exprData_getTripleInc (forPred->edata);
	435
	436	if (exprNode_isError (test) \|\| exprNode_isError (inc) )
	437	return;
	438
	439	iterations = getForTimes (forPred, forBody );
	440
	441	if (constraintExpr_isDefined (iterations) )
	442	{
	443	doAdjust ( e, forPred, forBody, iterations);
bb7c2085	444	constraintExpr_free (iterations);
d9900876	445	}
	446	}
	447
	448
	449	/* else */
	450	/* { */
	451	/* DPRINTF (("Can't get for time ")); */
	452	/* } */
	453
bb7c2085	454	/* if (exprNode_isError (init) ) */
d9900876	455	/* { */
	456	/* return; */
	457	/* } */
	458
	459	/* if (init->kind == XPR_ASSIGN) */
	460	/* { */
	461	/* t1 = exprData_getOpA (init->edata); */
	462	/* t2 = exprData_getOpB (init->edata); */
	463
	464	/* if (! (t1->kind == XPR_VAR) ) */
	465	/* return; */
	466	/* } */
	467	/* else */
	468	/* return; */
	469
	470	/* if (test->kind == XPR_FETCH) */
	471	/* { */
	472	/* t3 = exprData_getPairA (test->edata); */
	473	/* t4 = exprData_getPairB (test->edata); */
	474
bb7c2085	475	/* if (sRef_sameName (t1->sref, t4->sref) ) */
d9900876	476	/* { */
bb7c2085	477	/* DPRINTF ((message ("Found a for loop matching heuristic:%s", exprNode_unparse (forPred) ) )); */
	478	/* con = constraint_makeEnsureLteMaxRead (t1, t3); */
	479	/* forPred->ensuresConstraints = constraintList_add (forPred->ensuresConstraints, con); */
d9900876	480	/* } */
	481	/* else */
	482	/* { */
bb7c2085	483	/* DPRINTF ((message ("Didn't Find a for loop matching heuristic:%s %s and %s differ", exprNode_unparse (forPred), exprNode_unparse (t1), exprNode_unparse (t3) ) )); */
d9900876	484	/* } */
	485	/* return; */
	486	/* } */