objrtgen.c

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      theItem->value = AddBitMap(theEnv,(void *) &hack1,(int) sizeof(struct ObjectMatchVar1));
      return;
     }

   /* ======================================
      Access the entire contents of the slot
      ====================================== */
   if ((theNode->singleFieldsBefore == 0) &&
       (theNode->singleFieldsAfter == 0) &&
       (theNode->multiFieldsBefore == 0) &&
       (theNode->multiFieldsAfter == 0) &&
       ((theNode->withinMultifieldSlot == FALSE) ||
        (theNode->type == MF_VARIABLE) ||
        (theNode->type == MF_WILDCARD)))
     {
      hack1.allFields = 1;
      hack1.whichSlot = (unsigned short) theNode->slotNumber;
      theItem->type = (unsigned short) (joinReference ? OBJ_GET_SLOT_JNVAR1 : OBJ_GET_SLOT_PNVAR1);
      theItem->value = AddBitMap(theEnv,(void *) &hack1,(int) sizeof(struct ObjectMatchVar1));
      return;
     }

   /* =============================================================
      Access a particular field(s) in a multifield slot pattern
      containing at most one multifield variable and at least
      one (or two if no multifield variables) single-field variable
      ============================================================= */
   if (((theNode->type == SF_WILDCARD) || (theNode->type == SF_VARIABLE)) &&
       ((theNode->multiFieldsBefore == 0) || (theNode->multiFieldsAfter == 0)))
     {
      hack2.whichSlot = (unsigned short) theNode->slotNumber;
      if (theNode->multiFieldsBefore == 0)
        {
         hack2.fromBeginning = 1;
         hack2.beginningOffset = theNode->singleFieldsBefore;
        }
      else
        {
         hack2.fromEnd = 1;
         hack2.endOffset = theNode->singleFieldsAfter;
        }
      theItem->type = (unsigned short) (joinReference ? OBJ_GET_SLOT_JNVAR2 : OBJ_GET_SLOT_PNVAR2);
      theItem->value = AddBitMap(theEnv,(void *) &hack2,sizeof(struct ObjectMatchVar2));
      return;
     }

   if (((theNode->type == MF_WILDCARD) || (theNode->type == MF_VARIABLE)) &&
       (theNode->multiFieldsBefore == 0) &&
       (theNode->multiFieldsAfter == 0))
     {
      hack2.whichSlot = (unsigned short) theNode->slotNumber;
      hack2.fromBeginning = 1;
      hack2.fromEnd = 1;
      hack2.beginningOffset = theNode->singleFieldsBefore;
      hack2.endOffset = theNode->singleFieldsAfter;
      theItem->type = (unsigned short) (joinReference ? OBJ_GET_SLOT_JNVAR2 : OBJ_GET_SLOT_PNVAR2);
      theItem->value = AddBitMap(theEnv,(void *) &hack2,sizeof(struct ObjectMatchVar2));
      return;
     }

   /* ==================================================
      General slot field access using multifield markers
      ================================================== */
   hack1.whichSlot = (unsigned short) theNode->slotNumber;
   hack1.whichField = (unsigned short) theNode->index;
   theItem->type = (unsigned short) (joinReference ? OBJ_GET_SLOT_JNVAR1 : OBJ_GET_SLOT_PNVAR1);
   theItem->value = AddBitMap(theEnv,(void *) &hack1,sizeof(struct ObjectMatchVar1));
  }

/****************************************************************
  NAME         : IsSimpleSlotVariable
  DESCRIPTION  : Determines if a slot pattern variable
                 references a single-field slot or a single-field
                 in a multifield slot which does not require
                 use of multifield markers
                 (Object addresses are not simple variables)
  INPUTS       : The intermediate parse node
  RETURNS      : TRUE if the variable is simple,
                 FALSE otherwise
  SIDE EFFECTS : None
  NOTES        : None
 ****************************************************************/
static intBool IsSimpleSlotVariable(
  struct lhsParseNode *node)
  {
   if ((node->type == MF_WILDCARD) || (node->type == MF_VARIABLE))
     return(FALSE);
   if ((node->slotNumber < 0) ||
       (node->slotNumber == ISA_ID) ||
       (node->slotNumber == NAME_ID))
     return(FALSE);
   if (node->withinMultifieldSlot == FALSE)
     return(TRUE);
   if (node->multifieldSlot == TRUE)
     return(FALSE);
   if ((node->multiFieldsBefore == 0) || (node->multiFieldsAfter == 0))
     return(TRUE);
   return(FALSE);
  }

/***************************************************************
  NAME         : GenerateSlotComparisonTest
  DESCRIPTION  : Generates pattern and join network
                 expressions for comparing object
                 pattern variables
  INPUTS       : 1) A flag indicating if this is a
                    pattern or join network test
                 2) The intermediate parse node
                    for the first variable
                 3) The intermediate parse node
                    for the second variable
  RETURNS      : An expression for comparing the
                 variables
  SIDE EFFECTS : Expression and bitmaps generated
  NOTES        : The following tests are generated
                 for the following scenarios:

                 SF slot w/ SF slot: PN_1 or JN_1
                 Example: (foo ?x) with (bar ?xy)

                 SF slot w/ SF reference in MF slot: PN_2 or JN_2
                 Example: (foo ?x) (bar ? ?x ? ?)

                 SF reference w/ SF reference: PN_3 or JN_3
                 Example: (foo ? ?x ?) and (bar ? ? ? ?x)

                 All other cases: EQ/NEQ general test
                 Example: (foo $? ?x $?) and (bar ?x)
 ***************************************************************/
static EXPRESSION *GenerateSlotComparisonTest(
  void *theEnv,
  int joinTest,
  struct lhsParseNode *selfNode,
  struct lhsParseNode *referringNode)
  {
   EXPRESSION *theExp;
   struct ObjectCmpPNSingleSlotVars1 phack1;
   struct ObjectCmpPNSingleSlotVars2 phack2;
   struct ObjectCmpPNSingleSlotVars3 phack3;
   struct ObjectCmpJoinSingleSlotVars1 jhack1;
   struct ObjectCmpJoinSingleSlotVars2 jhack2;
   struct ObjectCmpJoinSingleSlotVars3 jhack3;

   /* =========================================================
      If we are comparing two single-field slot variables that
      don't require multifield markers for lookup, use
      a quick comparison.  Otherwise, use a general eq/neq with
      the pattern variable access routines
      ========================================================= */
   if (IsSimpleSlotVariable(selfNode) && IsSimpleSlotVariable(referringNode))
     {
      /* ==============================
         Compare two single-field slots
         ============================== */
      if ((selfNode->withinMultifieldSlot == FALSE) &&
          (referringNode->withinMultifieldSlot == FALSE))
        {
         ClearBitString((void *) &phack1,(int) sizeof(struct ObjectCmpPNSingleSlotVars1));
         ClearBitString((void *) &jhack1,(int) sizeof(struct ObjectCmpJoinSingleSlotVars1));
         if (selfNode->negated)
           phack1.fail = jhack1.fail = 1;
         else
           phack1.pass = jhack1.pass = 1;
         phack1.firstSlot = jhack1.firstSlot = (unsigned short) selfNode->slotNumber;
         phack1.secondSlot = jhack1.secondSlot = (unsigned short) referringNode->slotNumber;
         if (joinTest)
           {
            jhack1.firstPattern = (unsigned short) selfNode->pattern;
            jhack1.secondPattern = (unsigned short) referringNode->pattern;
            theExp = GenConstant(theEnv,OBJ_JN_CMP1,AddBitMap(theEnv,(void *) &jhack1,
                                           (int) sizeof(struct ObjectCmpJoinSingleSlotVars1)));
           }
         else
           theExp = GenConstant(theEnv,OBJ_PN_CMP1,AddBitMap(theEnv,(void *) &phack1,
                                           (int) sizeof(struct ObjectCmpPNSingleSlotVars1)));
        }
      /* ============================================
         Compare a single-field slot with a
         single-field in a multifield slot (make sure
         the multifield slot reference is first
         ============================================ */
      else if ((selfNode->withinMultifieldSlot == FALSE) ||
               (referringNode->withinMultifieldSlot == FALSE))
        {
         ClearBitString((void *) &phack2,(int) sizeof(struct ObjectCmpPNSingleSlotVars2));
         ClearBitString((void *) &jhack2,(int) sizeof(struct ObjectCmpJoinSingleSlotVars2));
         if (selfNode->negated)
           phack2.fail = jhack2.fail = 1;
         else
           phack2.pass = jhack2.pass = 1;
         if (selfNode->withinMultifieldSlot == TRUE)
           {
            phack2.firstSlot = jhack2.firstSlot = (unsigned short) selfNode->slotNumber;
            phack2.secondSlot = jhack2.secondSlot = (unsigned short) referringNode->slotNumber;
            if (joinTest)
              {
               jhack2.firstPattern = (unsigned short) selfNode->pattern;
               jhack2.secondPattern = (unsigned short) referringNode->pattern;
              }
            if (selfNode->multiFieldsBefore == 0)
              {
               phack2.fromBeginning = jhack2.fromBeginning = 1;
               phack2.offset = jhack2.offset = selfNode->singleFieldsBefore;
              }
            else
              phack2.offset = jhack2.offset = selfNode->singleFieldsAfter;
           }
         else
           {
            phack2.firstSlot = jhack2.firstSlot = (unsigned short) referringNode->slotNumber;
            phack2.secondSlot = jhack2.secondSlot = (unsigned short) selfNode->slotNumber;
            if (joinTest)
              {
               jhack2.firstPattern = (unsigned short) referringNode->pattern;
               jhack2.secondPattern = (unsigned short) selfNode->pattern;
              }
            if (referringNode->multiFieldsBefore == 0)
              {
               phack2.fromBeginning = jhack2.fromBeginning = 1;
               phack2.offset = jhack2.offset = referringNode->singleFieldsBefore;
              }
            else
              phack2.offset = jhack2.offset = referringNode->singleFieldsAfter;
           }
         if (joinTest)
           theExp = GenConstant(theEnv,OBJ_JN_CMP2,AddBitMap(theEnv,(void *) &jhack2,
                                           (int) sizeof(struct ObjectCmpJoinSingleSlotVars2)));
         else
           theExp = GenConstant(theEnv,OBJ_PN_CMP2,AddBitMap(theEnv,(void *) &phack2,
                                           (int) sizeof(struct ObjectCmpPNSingleSlotVars2)));
        }

      /* ===================================
         Compare two single-field references
         within multifield slots
         =================================== */
      else
        {
         ClearBitString((void *) &phack3,(int) sizeof(struct ObjectCmpPNSingleSlotVars3));
         ClearBitString((void *) &jhack3,(int) sizeof(struct ObjectCmpJoinSingleSlotVars3));
         if (selfNode->negated)
           phack3.fail = jhack3.fail = 1;
         else
           phack3.pass = jhack3.pass = 1;
         phack3.firstSlot = jhack3.firstSlot = (unsigned short) selfNode->slotNumber;
         phack3.secondSlot = jhack3.secondSlot = (unsigned short) referringNode->slotNumber;
         if (selfNode->multiFieldsBefore == 0)
           {
            phack3.firstFromBeginning = jhack3.firstFromBeginning = 1;
            phack3.firstOffset = jhack3.firstOffset = selfNode->singleFieldsBefore;
           }
         else
           phack3.firstOffset = jhack3.firstOffset = selfNode->singleFieldsAfter;
         if (referringNode->multiFieldsBefore == 0)
           {
            phack3.secondFromBeginning = jhack3.secondFromBeginning = 1;
            phack3.secondOffset = jhack3.secondOffset = referringNode->singleFieldsBefore;
           }
         else
           phack3.secondOffset = jhack3.secondOffset = referringNode->singleFieldsAfter;
         if (joinTest)
           {
            jhack3.firstPattern = (unsigned short) selfNode->pattern;
            jhack3.secondPattern = (unsigned short) referringNode->pattern;
            theExp = GenConstant(theEnv,OBJ_JN_CMP3,AddBitMap(theEnv,(void *) &jhack3,
                                         (int) sizeof(struct ObjectCmpJoinSingleSlotVars3)));
           }
         else
           theExp = GenConstant(theEnv,OBJ_PN_CMP3,AddBitMap(theEnv,(void *) &phack3,
                                           (int) sizeof(struct ObjectCmpPNSingleSlotVars3)));
        }
     }

   /* ==================================================
      General comparison for multifield slot references,
      references which require multifield markers, and
      object addresses
      ================================================== */
   else
     {
      theExp = GenConstant(theEnv,FCALL,selfNode->negated ? ExpressionData(theEnv)->PTR_NEQ : ExpressionData(theEnv)->PTR_EQ);
      theExp->argList = GenConstant(theEnv,0,NULL);
      GenObjectGetVar(theEnv,joinTest,theExp->argList,selfNode);
      theExp->argList->nextArg = GenConstant(theEnv,0,NULL);
      GenObjectGetVar(theEnv,joinTest,theExp->argList->nextArg,referringNode);
     }
   return(theExp);
  }

#endif

/***************************************************
  NAME         :
  DESCRIPTION  :
  INPUTS       :
  RETURNS      :
  SIDE EFFECTS :
  NOTES        :
 ***************************************************/