[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"

# include "exprDataQuite.i"

/*@access constraint, exprNode @*/

/*@access constraintExpr @*/

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_isInc_Op (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_isInc_Op (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
	44	# include "exprDataQuite.i"
	45
	46	/@access constraint, exprNode @/
	47
	48	/@access constraintExpr @/
	49
	50	static bool isInc (/@observer@/ constraintExpr c) /@/
	51	{
	52
bb7c2085	53	llassert (constraintExpr_isDefined (c) );
d9900876	54	if (c->kind == binaryexpr )
	55	{
	56	constraintExprBinaryOpKind binOP;
	57	constraintExpr t1, t2;
	58	t1 = constraintExprData_binaryExprGetExpr1 (c->data);
	59	t2 = constraintExprData_binaryExprGetExpr2 (c->data);
	60
	61	binOP = constraintExprData_binaryExprGetOp (c->data);
	62	if (binOP == BINARYOP_PLUS)
	63	if (constraintExpr_isLit (t2) && constraintExpr_getValue (t2) == 1 )
	64	{
	65	return TRUE;
	66	}
	67	}
	68
	69	return FALSE;
	70	}
	71
	72	/* look for constraints like cexrp = cexrp + 1 */
	73	static bool incVar (/@notnull@/ constraint c) /@/
	74	{
	75	constraintExpr t1;
	76	if (c->ar != EQ)
	77	{
	78	return FALSE;
	79	}
	80	if (! isInc (c->expr ) )
	81	return FALSE;
	82
bb7c2085	83	llassert (constraintExpr_isDefined (c->expr) );
d9900876	84	llassert (c->expr->kind == binaryexpr);
	85
	86	t1 = constraintExprData_binaryExprGetExpr1 (c->expr->data);
	87	if (constraintExpr_similar (c->lexpr, t1) )
	88	return TRUE;
	89
	90	return FALSE;
	91	}
	92	/@noaccess constraintExpr @/
	93
	94
	95	static bool increments (/@observer@/ constraint c,
	96	/@observer@/ constraintExpr var)
	97	{
bb7c2085	98	llassert (constraint_isDefined (c) );
d9900876	99
bb7c2085	100	if (constraint_isUndefined (c) )
d9900876	101	{
	102	return FALSE;
	103	}
	104
	105	llassert (incVar (c));
	106	if (constraintExpr_similar (c->lexpr, var) )
	107	return TRUE;
	108	else
	109	return FALSE;
	110	}
	111
	112	static bool canGetForTimes (/@notnull@/ exprNode forPred, /@notnull@/ exprNode forBody)
	113	{
	114
	115	exprNode init, test, inc, t1, t2;
	116	lltok tok;
	117
bb7c2085	118	llassert (exprNode_isDefined (forPred) );
bb7c2085	119	llassert (exprNode_isDefined (forBody) );
d9900876	120
	121	init = exprData_getTripleInit (forPred->edata);
	122	test = exprData_getTripleTest (forPred->edata);
	123	inc = exprData_getTripleInc (forPred->edata);
	124
bb7c2085	125	llassert (exprNode_isDefined (test) );
d9900876	126
bb7c2085	127	if (exprNode_isUndefined (test) )
d9900876	128	{
	129	return FALSE;
	130	}
	131
bb7c2085	132	llassert (exprNode_isDefined (inc) );
d9900876	133
bb7c2085	134	if (exprNode_isUndefined (inc) )
d9900876	135	{
	136	return FALSE;
	137	}
	138
	139	if (test->kind != XPR_PREOP)
	140	return FALSE;
	141
	142	tok = (exprData_getUopTok (test->edata));
	143	if (!lltok_isMult (tok) )
	144	{
	145	return FALSE;
	146	}
	147
	148	/* should check preop too */
	149	if (inc->kind != XPR_POSTOP)
	150	{
	151	return FALSE;
	152	}
	153
	154	tok = (exprData_getUopTok (inc->edata));
	155	if (lltok_isInc_Op (tok) )
	156	{
	157	t1 = exprData_getUopNode (test->edata);
	158	t2 = exprData_getUopNode (inc->edata);
bb7c2085	159	llassert (exprNode_isDefined (t2) && exprNode_isDefined (t2) );
d9900876	160
bb7c2085	161	if (exprNode_isUndefined (t1) \|\| exprNode_isUndefined (t2) )
d9900876	162	{
	163	return FALSE;
	164	}
	165
	166	if (sRef_sameName (t1->sref, t2->sref) )
	167	{
	168	return TRUE;
	169	}
	170	}
	171	return FALSE;
	172	}
	173
	174	static /@only@/ constraintList getLessThanConstraints (/@observer@/ constraintList c)
	175	{
	176	constraintList ret;
	177
bb7c2085	178	ret = constraintList_makeNew ();
d9900876	179	constraintList_elements (c, el)
d9900876	180	{
bb7c2085	181	llassert (constraint_isDefined (el));
bb7c2085	182	if ( constraint_isUndefined (el) )
d9900876	183	continue;
	184
	185	if (el->ar == LT \|\| el->ar == LTE)
	186	{
	187	constraint temp;
bb7c2085	188	temp = constraint_copy (el);
d9900876	189
	190	ret = constraintList_add (ret, temp);
	191	}
	192	}
	193	end_constraintList_elements;
	194
	195	return ret;
	196	}
	197
	198	static /@only@/ constraintList getIncConstraints (/@observer@/ constraintList c)
	199	{
	200	constraintList ret;
	201
bb7c2085	202	ret = constraintList_makeNew ();
d9900876	203	constraintList_elements (c, el)
	204	{
	205	llassert (constraint_isDefined (el));
	206
	207	if (incVar (el) )
	208	{
	209	constraint temp;
bb7c2085	210	temp = constraint_copy (el);
d9900876	211	ret = constraintList_add (ret, temp);
	212	}
	213	}
	214	end_constraintList_elements;
	215
	216	return ret;
	217	}
	218
	219	static /@only@/ constraintExpr getForTimes (/@notnull@/ exprNode forPred, /@notnull@/ exprNode forBody)
	220	{
	221
	222	exprNode init, test, inc, t1, t2;
	223	constraintList ltCon;
	224	constraintList incCon;
	225	constraintExpr ret;
	226
	227	lltok tok;
	228
	229	init = exprData_getTripleInit (forPred->edata);
	230	test = exprData_getTripleTest (forPred->edata);
	231	inc = exprData_getTripleInc (forPred->edata);
	232
bb7c2085	233	llassert (exprNode_isDefined (test) );
bb7c2085	234	llassert (exprNode_isDefined (inc) );
d9900876	235
	236	ltCon = getLessThanConstraints (test->trueEnsuresConstraints);
	237	incCon = getIncConstraints (inc->ensuresConstraints);
	238
bb7c2085	239	DPRINTF (( message ("getForTimes: ltCon: %s from %s", constraintList_print (ltCon), constraintList_print (test->trueEnsuresConstraints) ) ));
d9900876	240
bb7c2085	241	DPRINTF (( message ("getForTimes: incCon: %s from %s", constraintList_print (incCon), constraintList_print (inc->ensuresConstraints) ) ));
d9900876	242
	243	constraintList_elements (ltCon, el)
	244	{
bb7c2085	245	constraintList_elements (incCon, el2)
d9900876	246	{
bb7c2085	247	if ( increments (el2, el->lexpr) )
d9900876	248	{
bb7c2085	249	DPRINTF (( message ("getForTimes: %s increments %s", constraint_print (el2), constraint_print (el) ) ));
d9900876	250	ret = constraintExpr_copy (el->expr);
bb7c2085	251	constraintList_free (ltCon);
bb7c2085	252	constraintList_free (incCon);
d9900876	253	return ret;
	254
	255	}
	256	else
bb7c2085	257	DPRINTF (( message ("getForTimes: %s doesn't increment %s", constraint_print (el2), constraint_print (el) ) ));
d9900876	258	}
	259	end_constraintList_elements;
	260	}
	261
	262	end_constraintList_elements;
	263
bb7c2085	264	constraintList_free (ltCon);
bb7c2085	265	constraintList_free (incCon);
d9900876	266
bb7c2085	267	DPRINTF (( message ("getForTimes: %s %s resorting to ugly hack", exprNode_unparse (forPred), exprNode_unparse (forBody) ) ));
d9900876	268	if (! canGetForTimes (forPred, forBody) )
	269	{
	270	return NULL;
	271	}
	272
	273
	274	if (test->kind != XPR_PREOP)
	275	llassert (FALSE);
	276
	277	tok = (exprData_getUopTok (test->edata));
	278	if (!lltok_isMult (tok) )
	279	{
	280	llassert ( FALSE );
	281	}
	282
	283	/* should check preop too */
	284	if (inc->kind != XPR_POSTOP)
	285	{
	286	llassert (FALSE );
	287	}
	288
	289	tok = (exprData_getUopTok (inc->edata));
	290	if (lltok_isInc_Op (tok) )
	291	{
	292	t1 = exprData_getUopNode (test->edata);
	293	t2 = exprData_getUopNode (inc->edata);
	294	if (sRef_sameName (t1->sref, t2->sref) )
	295	{
	296	return (constraintExpr_makeMaxSetExpr (t1) );
	297	}
	298	}
bb7c2085	299	llassert ( FALSE);
d9900876	300	BADEXIT;
	301	}
	302
	303	/@access constraintExpr @/
	304
	305	static /@only@/ constraintExpr constraintExpr_searchAndAdd (/@only@/ constraintExpr c, /@observer@/ constraintExpr find, /@observer@/ constraintExpr add)
	306	{
	307	constraintExprKind kind;
	308	constraintExpr temp;
	309
bb7c2085	310	DPRINTF (( message ("Doing constraintExpr_searchAndAdd %s %s %s ",
bb7c2085	311	constraintExpr_unparse (c), constraintExpr_unparse (find), constraintExpr_unparse (add) ) ) );
d9900876	312
	313	if ( constraintExpr_similar (c, find) )
	314	{
	315
	316	constraintExpr newExpr;
	317
	318	cstring cPrint;
	319
bb7c2085	320	cPrint = constraintExpr_unparse (c);
d9900876	321
d9900876	322
bb7c2085	323	newExpr = constraintExpr_makeAddExpr (c, constraintExpr_copy (add) );
d9900876	324
bb7c2085	325	DPRINTF ((message ("Replacing %q with %q",
bb7c2085	326	cPrint, constraintExpr_unparse (newExpr)
d9900876	327	)));
	328	return newExpr;
	329	}
	330
	331	kind = c->kind;
	332
	333	switch (kind)
	334	{
	335	case term:
	336	break;
	337	case unaryExpr:
	338	temp = constraintExprData_unaryExprGetExpr (c->data);
bb7c2085	339	temp = constraintExpr_searchAndAdd (constraintExpr_copy (temp), find, add);
d9900876	340	c->data = constraintExprData_unaryExprSetExpr (c->data, temp);
	341	break;
	342	case binaryexpr:
	343
	344	temp = constraintExprData_binaryExprGetExpr1 (c->data);
bb7c2085	345	temp = constraintExpr_searchAndAdd (constraintExpr_copy (temp), find, add);
d9900876	346	c->data = constraintExprData_binaryExprSetExpr1 (c->data, temp);
	347
	348	temp = constraintExprData_binaryExprGetExpr2 (c->data);
bb7c2085	349	temp = constraintExpr_searchAndAdd (constraintExpr_copy (temp), find, add);
d9900876	350	c->data = constraintExprData_binaryExprSetExpr2 (c->data, temp);
	351	break;
	352	default:
bb7c2085	353	llassert (FALSE);
d9900876	354	}
	355	return c;
	356
	357	}
	358
	359	/@noaccess constraintExpr @/
	360
	361	static constraint constraint_searchAndAdd (/@returned@/ constraint c, /@observer@/ constraintExpr find, /@observer@/ constraintExpr add)
	362	{
	363
	364	llassert (constraint_search (c, find) );
bb7c2085	365	DPRINTF (( message ("Doing constraint_searchAndAdd %s %s %s ",
bb7c2085	366	constraint_print (c), constraintExpr_unparse (find), constraintExpr_unparse (add) ) ) );
d9900876	367
	368	c->lexpr = constraintExpr_searchAndAdd (c->lexpr, find, add);
	369	c->expr = constraintExpr_searchAndAdd (c->expr, find, add);
	370
	371	c = constraint_simplify (c);
	372	c = constraint_simplify (c);
	373
	374	return c;
	375
	376	}
	377
	378	static constraintList constraintList_searchAndAdd (/@returned@/ constraintList list,
	379	/@observer@/ constraintExpr find, /@observer@/ constraintExpr add)
	380	{
	381	constraintList newConstraints;
	382	constraintList ret;
	383
bb7c2085	384	newConstraints = constraintList_makeNew ();
d9900876	385
	386	constraintList_elements (list, el)
	387	{
	388	if (constraint_search (el, find) )
	389	{
	390	constraint newExpr;
	391	newExpr = constraint_copy (el);
	392
	393	newExpr = constraint_searchAndAdd (newExpr, find, add);
	394	DPRINTF (( (message ("Adding constraint %s ", constraint_print (newExpr)) ) ));
	395	newConstraints = constraintList_add (newConstraints, newExpr);
	396	}
	397
	398	}
	399	end_constraintList_elements;
	400
	401	ret = constraintList_addListFree (list, newConstraints);
	402	return ret;
	403	}
	404
bb7c2085	405	static void doAdjust (/@unused@/ exprNode e, /@unused@/ exprNode forPred, /@observer@/ exprNode forBody, /@observer@/ constraintExpr iterations)
d9900876	406	{
	407
	408	constraintList_elements (forBody->ensuresConstraints, el)
	409	{
	410	/* look for var = var + 1 */
bb7c2085	411	if (incVar (el) )
d9900876	412	{
bb7c2085	413	DPRINTF ((message ("Found inc variable constraint : %s", constraint_print (el) ) ));
bb7c2085	414	forBody->requiresConstraints = constraintList_searchAndAdd (forBody->requiresConstraints, el->lexpr, iterations);
d9900876	415	}
	416	}
	417	end_constraintList_elements;
	418	}
	419
bb7c2085	420	void exprNode_forLoopHeuristics ( exprNode e, exprNode forPred, exprNode forBody)
d9900876	421	{
	422	exprNode init, test, inc;
	423
	424	constraintExpr iterations;
	425
	426	init = exprData_getTripleInit (forPred->edata);
	427	test = exprData_getTripleTest (forPred->edata);
	428	inc = exprData_getTripleInc (forPred->edata);
	429
	430	if (exprNode_isError (test) \|\| exprNode_isError (inc) )
	431	return;
	432
	433	iterations = getForTimes (forPred, forBody );
	434
	435	if (constraintExpr_isDefined (iterations) )
	436	{
	437	doAdjust ( e, forPred, forBody, iterations);
bb7c2085	438	constraintExpr_free (iterations);
d9900876	439	}
	440	}
	441
	442
	443	/* else */
	444	/* { */
	445	/* DPRINTF (("Can't get for time ")); */
	446	/* } */
	447
bb7c2085	448	/* if (exprNode_isError (init) ) */
d9900876	449	/* { */
	450	/* return; */
	451	/* } */
	452
	453	/* if (init->kind == XPR_ASSIGN) */
	454	/* { */
	455	/* t1 = exprData_getOpA (init->edata); */
	456	/* t2 = exprData_getOpB (init->edata); */
	457
	458	/* if (! (t1->kind == XPR_VAR) ) */
	459	/* return; */
	460	/* } */
	461	/* else */
	462	/* return; */
	463
	464	/* if (test->kind == XPR_FETCH) */
	465	/* { */
	466	/* t3 = exprData_getPairA (test->edata); */
	467	/* t4 = exprData_getPairB (test->edata); */
	468
bb7c2085	469	/* if (sRef_sameName (t1->sref, t4->sref) ) */
d9900876	470	/* { */
bb7c2085	471	/* DPRINTF ((message ("Found a for loop matching heuristic:%s", exprNode_unparse (forPred) ) )); */
	472	/* con = constraint_makeEnsureLteMaxRead (t1, t3); */
	473	/* forPred->ensuresConstraints = constraintList_add (forPred->ensuresConstraints, con); */
d9900876	474	/* } */
	475	/* else */
	476	/* { */
bb7c2085	477	/* 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	478	/* } */
	479	/* return; */
	480	/* } */