1 /*-------------------------------------------------------------------------
3 SDCCicode.c - intermediate code generation etc.
4 Written By - Sandeep Dutta . sandeep.dutta@usa.net (1998)
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, or (at your option) any
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 In other words, you are welcome to use, share and improve this program.
21 You are forbidden to forbid anyone else to use, share and improve
22 what you give them. Help stamp out software-hoarding!
23 -------------------------------------------------------------------------*/
27 /*-----------------------------------------------------------------*/
28 /* global variables */
30 set *iCodeChain = NULL ;
43 symbol *returnLabel ; /* function return label */
44 symbol *entryLabel ; /* function entry label */
45 /*-----------------------------------------------------------------*/
46 /* forward definition of some functions */
47 operand *geniCodeDivision (operand *,operand *);
48 operand *geniCodeAssign (operand *,operand *,int);
49 operand *geniCodeArray (operand *,operand *);
50 operand *geniCodeArray2Ptr (operand *);
51 operand *geniCodeRValue (operand *, bool );
52 operand *geniCodeDerefPtr (operand *);
54 #define PRINTFUNC(x) void x (FILE *of, iCode *ic, char *s)
55 /* forward definition of print functions */
56 PRINTFUNC(picGetValueAtAddr);
57 PRINTFUNC(picSetValueAtAddr);
59 PRINTFUNC(picGeneric);
60 PRINTFUNC(picGenericOne);
66 PRINTFUNC(picJumpTable);
68 PRINTFUNC(picReceive);
70 iCodeTable codeTable[] = {
71 { '!' , "not", picGenericOne , NULL },
72 { '~' , "~" , picGenericOne , NULL },
73 { RRC , "rrc", picGenericOne , NULL },
74 { RLC , "rlc", picGenericOne , NULL },
75 { GETHBIT ,"ghbit", picGenericOne , NULL },
76 { UNARYMINUS , "-" , picGenericOne , NULL },
77 { IPUSH , "push",picGenericOne , NULL },
78 { IPOP , "pop", picGenericOne , NULL },
79 { CALL , "call",picGenericOne , NULL },
80 { PCALL , "pcall",picGenericOne , NULL },
81 { FUNCTION , "proc", picGenericOne , NULL },
82 { ENDFUNCTION ,"eproc", picGenericOne , NULL },
83 { RETURN , "ret", picGenericOne , NULL },
84 { '+' , "+" , picGeneric , NULL },
85 { '-' , "-" , picGeneric , NULL },
86 { '*' , "*" , picGeneric , NULL },
87 { '/' , "/" , picGeneric , NULL },
88 { '%' , "%" , picGeneric , NULL },
89 { '>' , ">" , picGeneric , NULL },
90 { '<' , "<" , picGeneric , NULL },
91 { LE_OP , "<=" , picGeneric , NULL },
92 { GE_OP , ">=" , picGeneric , NULL },
93 { EQ_OP , "==" , picGeneric , NULL },
94 { NE_OP , "!=" , picGeneric , NULL },
95 { AND_OP , "&&" , picGeneric , NULL },
96 { OR_OP , "||" , picGeneric , NULL },
97 { '^' , "^" , picGeneric , NULL },
98 { '|' , "|" , picGeneric , NULL },
99 { BITWISEAND , "&" , picGeneric , NULL },
100 { LEFT_OP , "<<" , picGeneric , NULL },
101 { RIGHT_OP , ">>" , picGeneric , NULL },
102 { GET_VALUE_AT_ADDRESS, "@" , picGetValueAtAddr, NULL },
103 { ADDRESS_OF , "&" , picAddrOf , NULL },
104 { CAST , "<>" , picCast , NULL },
105 { '=' , ":=" , picAssign , NULL },
106 { LABEL , "" , picLabel , NULL },
107 { GOTO , "" , picGoto , NULL },
108 { JUMPTABLE ,"jtab" , picJumpTable , NULL },
109 { IFX , "if" , picIfx , NULL },
110 { INLINEASM , "" , picInline , NULL },
111 { RECEIVE , "recv", picReceive , NULL },
112 { SEND , "send", picGenericOne , NULL }
116 /*-----------------------------------------------------------------*/
117 /* operandName - returns the name of the operand */
118 /*-----------------------------------------------------------------*/
119 int printOperand (operand *op, FILE *file)
134 opetype = getSpec (operandType(op));
135 if (SPEC_NOUN(opetype) == V_FLOAT)
136 fprintf (file,"%g {", SPEC_CVAL(opetype).v_float);
138 fprintf (file,"0x%x {",(int) floatFromVal(op->operand.valOperand));
139 printTypeChain(operandType(op),file);
146 fprintf (file,"%s [k%d lr%d:%d so:%d]{ ia%d re%d rm%d}",/*{ar%d rm%d ru%d p%d a%d u%d i%d au%d k%d ks%d}" ,*/
147 (OP_SYMBOL(op)->rname[0] ? OP_SYMBOL(op)->rname : OP_SYMBOL(op)->name),
149 OP_LIVEFROM(op),OP_LIVETO(op),
150 OP_SYMBOL(op)->stack,
151 op->isaddr, OP_SYMBOL(op)->isreqv,OP_SYMBOL(op)->remat
154 fprintf(file,"{"); printTypeChain(operandType(op),file);
155 if (SPIL_LOC(op) && IS_ITEMP(op))
156 fprintf(file,"}{ sir@ %s",SPIL_LOC(op)->rname);
161 /* if assigned to registers */
162 if (OP_SYMBOL(op)->nRegs) {
163 if (OP_SYMBOL(op)->isspilt) {
164 if (!OP_SYMBOL(op)->remat)
165 if (OP_SYMBOL(op)->usl.spillLoc)
166 fprintf(file,"[%s]",(OP_SYMBOL(op)->usl.spillLoc->rname[0] ?
167 OP_SYMBOL(op)->usl.spillLoc->rname :
168 OP_SYMBOL(op)->usl.spillLoc->name));
170 fprintf(file,"[err]");
172 fprintf(file,"[remat]");
177 for(i=0;i<OP_SYMBOL(op)->nRegs;i++)
178 fprintf(file,"%s ", port->getRegName(OP_SYMBOL(op)->regs[i]));
183 fprintf(file,"%s",(OP_SYMBOL(op)->rname[0] ?
184 OP_SYMBOL(op)->rname : OP_SYMBOL(op)->name));
185 /* if assigned to registers */
186 if (OP_SYMBOL(op)->nRegs && !OP_SYMBOL(op)->isspilt) {
189 for(i=0;i<OP_SYMBOL(op)->nRegs;i++)
190 fprintf(file,"%s ",(OP_SYMBOL(op)->regs[i] ?
191 OP_SYMBOL(op)->regs[i]->name :
200 printTypeChain(op->operand.typeOperand,file);
211 /*-----------------------------------------------------------------*/
212 /* print functions */
213 /*-----------------------------------------------------------------*/
214 PRINTFUNC(picGetValueAtAddr)
217 printOperand (IC_RESULT(ic),of);
220 printOperand (IC_LEFT(ic), of);
226 PRINTFUNC(picSetValueAtAddr)
230 printOperand(IC_LEFT(ic),of);
232 printOperand(IC_RIGHT(ic),of);
239 printOperand(IC_RESULT(ic),of);
240 if (IS_ITEMP(IC_LEFT(ic)))
244 printOperand(IC_LEFT(ic),of);
246 if (IS_ITEMP(IC_LEFT(ic)))
247 fprintf(of," offsetAdd ");
250 printOperand(IC_RIGHT(ic),of);
252 if (IS_ITEMP(IC_LEFT(ic)))
258 PRINTFUNC(picJumpTable)
263 fprintf(of,"%s\t",s);
264 printOperand(IC_JTCOND(ic),of);
266 for ( sym = setFirstItem(IC_JTLABELS(ic)); sym;
267 sym = setNextItem(IC_JTLABELS(ic)))
268 fprintf(of,"\t\t\t%s\n",sym->name);
271 PRINTFUNC(picGeneric)
274 printOperand(IC_RESULT(ic),of);
276 printOperand(IC_LEFT(ic),of);
277 fprintf(of," %s ",s);
278 printOperand(IC_RIGHT(ic),of);
282 PRINTFUNC(picGenericOne)
285 if ( IC_RESULT(ic) ) {
286 printOperand(IC_RESULT(ic),of);
291 fprintf (of,"%s ",s);
292 printOperand(IC_LEFT(ic),of);
295 if (! IC_RESULT(ic) && !IC_LEFT(ic))
304 printOperand(IC_RESULT(ic),of);
306 printOperand(IC_LEFT(ic),of);
307 printOperand(IC_RIGHT(ic),of);
316 if (IC_RESULT(ic)->isaddr && IS_ITEMP(IC_RESULT(ic)))
319 printOperand(IC_RESULT(ic),of);
321 if (IC_RESULT(ic)->isaddr && IS_ITEMP(IC_RESULT(ic)))
324 fprintf(of," %s ", s);
325 printOperand (IC_RIGHT(ic),of);
332 fprintf(of," %s($%d) :\n",IC_LABEL(ic)->name,IC_LABEL(ic)->key);
338 fprintf (of," goto %s($%d)\n", IC_LABEL(ic)->name,IC_LABEL(ic)->key);
345 printOperand(IC_COND(ic),of);
348 fprintf (of," == 0 goto %s($%d)\n",IC_FALSE(ic)->name,IC_FALSE(ic)->key);
350 fprintf (of," != 0 goto %s($%d)\n",IC_TRUE(ic)->name,IC_TRUE(ic)->key);
352 fprintf (of,"\tzzgoto %s\n",IC_FALSE(ic)->name);
358 fprintf(of,"%s",IC_INLINE(ic));
361 PRINTFUNC(picReceive)
363 printOperand(IC_RESULT(ic),of);
364 fprintf(of," = %s ",s);
365 printOperand(IC_LEFT(ic),of);
369 /*-----------------------------------------------------------------*/
370 /* piCode - prints one iCode */
371 /*-----------------------------------------------------------------*/
372 int piCode (void *item, FILE *of)
380 icTab = getTableEntry(ic->op) ;
381 fprintf(stdout,"%s(%d:%d:%d:%d:%d)\t",
382 ic->filename,ic->lineno,
383 ic->seq,ic->key,ic->depth,ic->supportRtn);
384 icTab->iCodePrint(of,ic,icTab->printName);
388 /*-----------------------------------------------------------------*/
389 /* printiCChain - prints intermediate code for humans */
390 /*-----------------------------------------------------------------*/
391 void printiCChain (iCode *icChain, FILE *of)
398 for ( loop = icChain ; loop ; loop = loop->next ) {
399 if ((icTab = getTableEntry (loop->op ))) {
400 fprintf(of,"%s(%d:%d:%d:%d:%d)\t",
401 loop->filename,loop->lineno,
402 loop->seq,loop->key,loop->depth,loop->supportRtn);
404 icTab->iCodePrint (of,loop,icTab->printName);
410 /*-----------------------------------------------------------------*/
411 /* newOperand - allocate, init & return a new iCode */
412 /*-----------------------------------------------------------------*/
413 operand *newOperand ()
417 ALLOC(op,sizeof(operand));
423 /*-----------------------------------------------------------------*/
424 /* newiCode - create and return a new iCode entry initialised */
425 /*-----------------------------------------------------------------*/
426 iCode *newiCode (int op, operand *left, operand *right)
430 ALLOC(ic,sizeof(iCode));
432 ic->lineno = lineno ;
433 ic->filename= filename ;
435 ic->level = scopeLevel;
437 ic->key= iCodeKey++ ;
444 /*-----------------------------------------------------------------*/
445 /* newiCode for conditional statements */
446 /*-----------------------------------------------------------------*/
447 iCode *newiCodeCondition (operand *condition,
453 ic = newiCode(IFX,NULL,NULL);
454 IC_COND(ic) = condition ;
455 IC_TRUE(ic) = trueLabel ;
456 IC_FALSE(ic) = falseLabel;
460 /*-----------------------------------------------------------------*/
461 /* newiCodeLabelGoto - unconditional goto statement| label stmnt */
462 /*-----------------------------------------------------------------*/
463 iCode *newiCodeLabelGoto (int op, symbol *label)
467 ic = newiCode(op,NULL,NULL);
469 ic->argLabel.label = label ;
471 IC_RIGHT(ic) = NULL ;
472 IC_RESULT(ic) = NULL ;
476 /*-----------------------------------------------------------------*/
477 /* newiTemp - allocate & return a newItemp Variable */
478 /*-----------------------------------------------------------------*/
479 symbol *newiTemp (char *s)
484 sprintf(buffer,"%s",s);
486 sprintf (buffer,"iTemp%d",iTempNum++);
487 itmp = newSymbol (buffer,1);
488 strcpy(itmp->rname,itmp->name);
494 /*-----------------------------------------------------------------*/
495 /* newiTempLabel - creates a temp variable label */
496 /*-----------------------------------------------------------------*/
497 symbol *newiTempLabel (char *s)
501 /* check if this alredy exists */
502 if (s && (itmplbl = findSym(LabelTab, NULL, s)))
506 itmplbl = newSymbol(s,1);
508 sprintf(buffer,"iTempLbl%d",iTempLblNum++);
509 itmplbl = newSymbol(buffer,1);
514 itmplbl->key = labelKey++ ;
515 addSym (LabelTab, itmplbl, itmplbl->name,0,0);
519 /*-----------------------------------------------------------------*/
520 /* newiTempPreheaderLabel - creates a new preheader label */
521 /*-----------------------------------------------------------------*/
522 symbol *newiTempPreheaderLabel()
526 sprintf(buffer,"preHeaderLbl%d",iTempLblNum++);
527 itmplbl = newSymbol(buffer,1);
531 itmplbl->key = labelKey++ ;
532 addSym (LabelTab, itmplbl, itmplbl->name,0,0);
537 /*-----------------------------------------------------------------*/
538 /* initiCode - initialises some iCode related stuff */
539 /*-----------------------------------------------------------------*/
545 /*-----------------------------------------------------------------*/
546 /* copyiCode - make a copy of the iCode given */
547 /*-----------------------------------------------------------------*/
548 iCode *copyiCode (iCode *ic)
550 iCode *nic = newiCode(ic->op,NULL,NULL);
552 nic->lineno = ic->lineno ;
553 nic->filename= ic->filename ;
554 nic->block = ic->block;
555 nic->level = ic->level;
557 /* deal with the special cases first */
560 IC_COND(nic) = operandFromOperand(IC_COND(ic));
561 IC_TRUE(nic) = IC_TRUE(ic);
562 IC_FALSE(nic)= IC_FALSE(ic);
566 IC_JTCOND(nic) = operandFromOperand(IC_JTCOND(ic));
567 IC_JTLABELS(nic) = IC_JTLABELS(ic);
572 IC_RESULT(nic) = operandFromOperand(IC_RESULT(ic));
573 IC_LEFT(nic) = operandFromOperand(IC_LEFT(ic));
574 IC_ARGS(nic) = IC_ARGS(ic);
578 IC_INLINE(nic) = IC_INLINE(ic);
582 IC_RESULT(nic) = operandFromOperand(IC_RESULT(ic));
583 IC_LEFT(nic) = operandFromOperand(IC_LEFT(ic));
584 IC_RIGHT(nic)= operandFromOperand(IC_RIGHT(ic));
590 /*-----------------------------------------------------------------*/
591 /* getTableEntry - gets the table entry for the given operator */
592 /*-----------------------------------------------------------------*/
593 iCodeTable *getTableEntry (int oper )
597 for ( i = 0 ; i < (sizeof(codeTable)/sizeof(iCodeTable)); i++ )
598 if (oper == codeTable[i].icode)
599 return &codeTable[i] ;
604 /*-----------------------------------------------------------------*/
605 /* newiTempOperand - new intermediate temp operand */
606 /*-----------------------------------------------------------------*/
607 operand *newiTempOperand (link *type, char throwType)
610 operand *op = newOperand();
614 itmp = newiTemp(NULL);
616 etype = getSpec(type);
618 if (IS_LITERAL(etype) )
621 /* copy the type information */
623 itmp->etype = getSpec (itmp->type = (throwType ? type :
624 copyLinkChain(type)));
625 if (IS_LITERAL(itmp->etype)) {
626 SPEC_SCLS(itmp->etype) = S_REGISTER ;
627 SPEC_OCLS(itmp->etype) = reg;
630 op->operand.symOperand = itmp;
631 op->key = itmp->key = ++operandKey ;
635 /*-----------------------------------------------------------------*/
636 /* operandType - returns the type chain for an operand */
637 /*-----------------------------------------------------------------*/
638 link *operandType (operand *op)
640 /* depending on type of operand */
644 return op->operand.valOperand->type ;
647 return op->operand.symOperand->type ;
650 return op->operand.typeOperand ;
653 werror (E_INTERNAL_ERROR,__FILE__,__LINE__,
654 " operand type not known ");
655 assert (0) ; /* should never come here */
656 /* Just to keep the compiler happy */
660 /*-----------------------------------------------------------------*/
661 /* isParamterToCall - will return 1 if op is a parameter to args */
662 /*-----------------------------------------------------------------*/
663 int isParameterToCall (value *args, operand *op)
669 isSymbolEqual(op->operand.symOperand,tval->sym))
676 /*-----------------------------------------------------------------*/
677 /* isOperandGlobal - return 1 if operand is a global variable */
678 /*-----------------------------------------------------------------*/
679 int isOperandGlobal ( operand *op )
687 if (op->type == SYMBOL &&
688 (op->operand.symOperand->level == 0 ||
689 IS_STATIC(op->operand.symOperand->etype) ||
690 IS_EXTERN(op->operand.symOperand->etype))
697 /*-----------------------------------------------------------------*/
698 /* isOperandVolatile - return 1 if the operand is volatile */
699 /*-----------------------------------------------------------------*/
700 int isOperandVolatile ( operand *op , bool chkTemp)
705 if (IS_ITEMP(op) && !chkTemp)
708 opetype = getSpec(optype = operandType(op));
710 if (IS_PTR(optype) && DCL_PTR_VOLATILE(optype))
713 if (IS_VOLATILE(opetype))
718 /*-----------------------------------------------------------------*/
719 /* isOperandLiteral - returns 1 if an operand contains a literal */
720 /*-----------------------------------------------------------------*/
721 int isOperandLiteral ( operand *op )
728 opetype = getSpec (operandType(op));
730 if (IS_LITERAL(opetype))
735 /*-----------------------------------------------------------------*/
736 /* isOperandInFarSpace - will return true if operand is in farSpace*/
737 /*-----------------------------------------------------------------*/
738 bool isOperandInFarSpace (operand *op)
748 if (!IS_TRUE_SYMOP(op)) {
750 etype = SPIL_LOC(op)->etype;
755 etype = getSpec(operandType(op));
756 return (IN_FARSPACE(SPEC_OCLS(etype)) ? TRUE : FALSE);
759 /*-----------------------------------------------------------------*/
760 /* operandLitValue - literal value of an operand */
761 /*-----------------------------------------------------------------*/
762 double operandLitValue ( operand *op )
764 assert(isOperandLiteral(op));
766 return floatFromVal(op->operand.valOperand);
769 /*-----------------------------------------------------------------*/
770 /* operandOperation - perforoms operations on operands */
771 /*-----------------------------------------------------------------*/
772 operand *operandOperation (operand *left,operand *right,
775 operand *retval = (operand *)0;
777 assert(isOperandLiteral(left));
779 assert(isOperandLiteral(right));
783 retval = operandFromValue (valCastLiteral(type,
784 operandLitValue(left) +
785 operandLitValue(right)));
788 retval = operandFromValue(valCastLiteral(type,
789 operandLitValue(left) -
790 operandLitValue(right)));
793 retval = operandFromValue(valCastLiteral(type,
794 operandLitValue(left) *
795 operandLitValue(right)));
798 if ((unsigned long) operandLitValue(right) == 0){
799 werror(E_DIVIDE_BY_ZERO);
804 retval = operandFromValue (valCastLiteral(type,
805 operandLitValue(left) /
806 operandLitValue(right)));
809 if ((unsigned long) operandLitValue(right) == 0){
810 werror(E_DIVIDE_BY_ZERO);
814 retval = operandFromLit ((unsigned long) operandLitValue(left) %
815 (unsigned long) operandLitValue(right));
818 retval = operandFromLit ((unsigned long) operandLitValue(left) <<
819 (unsigned long) operandLitValue(right));
822 retval = operandFromLit ((unsigned long) operandLitValue(left) >>
823 (unsigned long) operandLitValue(right));
826 retval = operandFromLit (operandLitValue(left) ==
827 operandLitValue(right));
830 retval = operandFromLit (operandLitValue(left) <
831 operandLitValue(right));
834 retval = operandFromLit (operandLitValue(left) <=
835 operandLitValue(right));
838 retval = operandFromLit (operandLitValue(left) !=
839 operandLitValue(right));
842 retval = operandFromLit (operandLitValue(left) >
843 operandLitValue(right));
846 retval = operandFromLit (operandLitValue(left) >=
847 operandLitValue(right));
850 retval = operandFromLit ((unsigned long) operandLitValue(left) &
851 (unsigned long) operandLitValue(right));
854 retval = operandFromLit ((unsigned long) operandLitValue(left) |
855 (unsigned long) operandLitValue(right));
858 retval = operandFromLit ((unsigned long) operandLitValue(left) ^
859 (unsigned long) operandLitValue(right));
862 retval = operandFromLit (operandLitValue(left) &&
863 operandLitValue(right));
866 retval = operandFromLit (operandLitValue(left) ||
867 operandLitValue(right));
871 long i = operandLitValue(left);
873 retval = operandFromLit ((i >> (getSize(operandType(left))*8 - 1)) |
879 long i = operandLitValue(left);
881 retval = operandFromLit ((i << (getSize(operandType(left))*8 - 1)) |
887 retval = operandFromLit(-1 * operandLitValue(left));
891 retval = operandFromLit(~ ((long) operandLitValue(left)));
895 retval = operandFromLit(! operandLitValue(left));
899 werror(E_INTERNAL_ERROR,__FILE__,__LINE__,
900 " operandOperation invalid operator ");
908 /*-----------------------------------------------------------------*/
909 /* isOperandEqual - compares two operand & return 1 if they r = */
910 /*-----------------------------------------------------------------*/
911 int isOperandEqual (operand *left, operand *right)
913 /* if the pointers are equal then they are equal */
917 /* if either of them null then false */
918 if ( !left || !right)
921 if (left->type != right->type)
924 if (IS_SYMOP(left) && IS_SYMOP(right))
925 return left->key == right->key ;
927 /* if types are the same */
928 switch (left->type) {
930 return isSymbolEqual(left->operand.symOperand,
931 right->operand.symOperand);
933 return (floatFromVal(left->operand.valOperand) ==
934 floatFromVal(right->operand.valOperand));
936 if (checkType(left->operand.typeOperand,
937 right->operand.typeOperand) == 1)
944 /*-----------------------------------------------------------------*/
945 /* isiCodeEqual - comapres two iCodes are returns true if yes */
946 /*-----------------------------------------------------------------*/
947 int isiCodeEqual (iCode *left, iCode *right)
949 /* if the same pointer */
953 /* if either of them null */
957 /* if operand are the same */
958 if ( left->op == right->op ) {
960 /* compare all the elements depending on type */
961 if (left->op != IFX ) {
962 if (!isOperandEqual(IC_LEFT(left),IC_LEFT(right)))
964 if (!isOperandEqual(IC_RIGHT(left),IC_RIGHT(right)))
968 if (!isOperandEqual(IC_COND(left),IC_COND(right)))
970 if (!isSymbolEqual (IC_TRUE(left),IC_TRUE(right)))
972 if (!isSymbolEqual(IC_FALSE(left),IC_FALSE(right)))
980 /*-----------------------------------------------------------------*/
981 /* newiTempFromOp - create a temp Operand with same attributes */
982 /*-----------------------------------------------------------------*/
983 operand *newiTempFromOp (operand *op)
993 nop = newiTempOperand(operandType(op),TRUE);
994 nop->isaddr = op->isaddr ;
995 nop->isvolatile = op->isvolatile ;
996 nop->isGlobal = op->isGlobal ;
997 nop->isLiteral= op->isLiteral ;
998 nop->noSpilLoc= op->noSpilLoc;
999 nop->usesDefs = op->usesDefs;
1000 nop->isParm = op->isParm;
1001 nop->parmBytes = op->parmBytes;
1005 /*-----------------------------------------------------------------*/
1006 /* operand from operand - creates an operand holder for the type */
1007 /*-----------------------------------------------------------------*/
1008 operand *operandFromOperand (operand *op)
1015 nop->type = op->type;
1016 nop->isaddr = op->isaddr ;
1017 nop->key = op->key ;
1018 nop->isvolatile = op->isvolatile ;
1019 nop->isGlobal = op->isGlobal ;
1020 nop->isLiteral= op->isLiteral ;
1021 nop->noSpilLoc= op->noSpilLoc;
1022 nop->usesDefs = op->usesDefs;
1023 nop->isParm = op->isParm;
1024 nop->parmBytes = op->parmBytes;
1026 switch (nop->type) {
1028 nop->operand.symOperand = op->operand.symOperand ;
1031 nop->operand.valOperand = op->operand.valOperand;
1034 nop->operand.typeOperand = op->operand.typeOperand ;
1041 /*-----------------------------------------------------------------*/
1042 /* opFromOpWithDU - makes a copy of the operand and DU chains */
1043 /*-----------------------------------------------------------------*/
1044 operand *opFromOpWithDU (operand *op, bitVect *defs, bitVect *uses)
1046 operand *nop = operandFromOperand(op);
1048 if (nop->type == SYMBOL) {
1049 OP_SYMBOL(nop)->defs = bitVectCopy(defs);
1050 OP_SYMBOL(nop)->uses = bitVectCopy(uses);
1056 /*-----------------------------------------------------------------*/
1057 /* operandFromSymbol - creates an operand from a symbol */
1058 /*-----------------------------------------------------------------*/
1059 operand *operandFromSymbol (symbol *sym)
1064 /* if the symbol's type is a literal */
1065 /* then it is an enumerator type */
1066 if (IS_LITERAL(sym->etype) && SPEC_ENUM(sym->etype))
1067 return operandFromValue (valFromType(sym->etype));
1070 sym->key = ++operandKey ;
1072 /* if this an implicit variable, means struct/union */
1073 /* member so just return it */
1074 if (sym->implicit || IS_FUNC(sym->type)) {
1077 op->operand.symOperand = sym;
1078 op->key = sym->key ;
1079 op->isvolatile = isOperandVolatile(op,TRUE);
1080 op->isGlobal = isOperandGlobal(op);
1081 op->parmBytes = sym->argStack;
1085 /* under the following conditions create a
1086 register equivalent for a local symbol */
1087 if (!IS_AGGREGATE(sym->type) && /* not an aggregate */
1088 !IS_FUNC(sym->type) && /* not a function */
1089 !sym->_isparm && /* not a parameter */
1090 sym->level && /* is a local variable */
1091 !sym->addrtaken && /* whose address has not been taken */
1092 !sym->reqv && /* does not already have a register euivalence */
1093 !IS_VOLATILE(sym->etype) && /* not declared as volatile */
1094 !IS_STATIC(sym->etype) && /* and not declared static */
1095 !sym->islbl && /* not a label */
1096 !IN_FARSPACE(SPEC_OCLS(sym->etype)) && /* not in far space */
1097 !IS_BITVAR(sym->etype) /* not a bit variable */
1100 /* we will use it after all optimizations
1101 and before liveRange calculation */
1102 sym->reqv = newiTempOperand(sym->type,0);
1103 sym->reqv->key = sym->key ;
1104 OP_SYMBOL(sym->reqv)->key = sym->key;
1105 OP_SYMBOL(sym->reqv)->isreqv = 1;
1106 OP_SYMBOL(sym->reqv)->islocal = 1;
1107 SPIL_LOC(sym->reqv) = sym;
1110 if (!IS_AGGREGATE(sym->type)) {
1113 op->operand.symOperand = sym;
1116 op->isvolatile = isOperandVolatile(op,TRUE);
1117 op->isGlobal = isOperandGlobal(op);
1118 op->isPtr = IS_PTR(operandType(op));
1119 op->isParm = sym->_isparm ;
1124 /* itemp = &[_symbol] */
1126 ic = newiCode(ADDRESS_OF,newOperand(),NULL);
1127 IC_LEFT(ic)->type = SYMBOL ;
1128 IC_LEFT(ic)->operand.symOperand = sym ;
1129 IC_LEFT(ic)->key = sym->key;
1130 (IC_LEFT(ic))->isvolatile = isOperandVolatile(IC_LEFT(ic),TRUE);
1131 (IC_LEFT(ic))->isGlobal = isOperandGlobal(IC_LEFT(ic));
1132 IC_LEFT(ic)->isPtr = IS_PTR(operandType(IC_LEFT(ic)));
1135 IC_RESULT(ic) = newiTempOperand(sym->type,0);
1136 if (IS_ARRAY(sym->type)) {
1137 IC_RESULT(ic) = geniCodeArray2Ptr (IC_RESULT(ic));
1138 IC_RESULT(ic)->isaddr = 0;
1140 IC_RESULT(ic)->isaddr = (!IS_AGGREGATE(sym->type));
1142 IC_RESULT(ic)->operand.symOperand->args = sym->args;
1146 return IC_RESULT(ic) ;
1149 /*-----------------------------------------------------------------*/
1150 /* operandFromValue - creates an operand from value */
1151 /*-----------------------------------------------------------------*/
1152 operand *operandFromValue (value *val)
1156 /* if this is a symbol then do the symbol thing */
1158 return operandFromSymbol (val->sym);
1160 /* this is not a symbol */
1163 op->operand.valOperand = val ;
1164 op->isLiteral = isOperandLiteral(op);
1168 /*-----------------------------------------------------------------*/
1169 /* operandFromLink - operand from typeChain */
1170 /*-----------------------------------------------------------------*/
1171 operand *operandFromLink (link *type)
1175 /* operand from link */
1181 op->operand.typeOperand = copyLinkChain(type);
1185 /*-----------------------------------------------------------------*/
1186 /* operandFromLit - makes an operand from a literal value */
1187 /*-----------------------------------------------------------------*/
1188 operand *operandFromLit ( float i)
1190 return operandFromValue (valueFromLit (i));
1193 /*-----------------------------------------------------------------*/
1194 /* operandFromAst - creates an operand from an ast */
1195 /*-----------------------------------------------------------------*/
1196 operand *operandFromAst ( ast *tree )
1202 /* depending on type do */
1203 switch (tree->type ) {
1205 return ast2iCode (tree) ;
1209 return operandFromValue(tree->opval.val) ;
1213 return operandFromLink (tree->opval.lnk) ;
1217 /* Just to keep the comiler happy */
1218 return (operand *)0;
1221 /*-----------------------------------------------------------------*/
1222 /* setOperandType - sets the operand's type to the given type */
1223 /*-----------------------------------------------------------------*/
1224 void setOperandType (operand *op, link *type)
1226 /* depending on the type of operand */
1230 op->operand.valOperand->etype =
1231 getSpec( op->operand.valOperand->type =
1232 copyLinkChain (type )) ;
1236 if (op->operand.symOperand->isitmp )
1237 op->operand.symOperand->etype =
1238 getSpec( op->operand.symOperand->type =
1239 copyLinkChain (type )) ;
1241 werror (E_INTERNAL_ERROR,__FILE__,__LINE__,
1242 "attempt to modify type of source");
1246 op->operand.typeOperand = copyLinkChain (type);
1252 /*-----------------------------------------------------------------*/
1253 /* geniCodeValueAtAddress - generate intermeditate code for value */
1255 /*-----------------------------------------------------------------*/
1256 operand *geniCodeRValue (operand *op, bool force)
1259 link *type = operandType(op);
1260 link *etype= getSpec(type);
1262 /* if this is an array & already */
1263 /* an address then return this */
1264 if (IS_AGGREGATE(type) ||
1265 (IS_PTR(type) && !force && !op->isaddr))
1266 return operandFromOperand(op);
1268 /* if this is not an address then must be */
1269 /* rvalue already so return this one */
1273 /* if this is not a temp symbol then */
1274 if (!IS_ITEMP(op) &&
1276 !IN_FARSPACE(SPEC_OCLS(etype))) {
1277 op = operandFromOperand(op);
1282 if (IS_SPEC(type) &&
1283 IS_TRUE_SYMOP(op) &&
1284 !IN_FARSPACE(SPEC_OCLS(etype))) {
1285 op = operandFromOperand(op);
1290 ic = newiCode(GET_VALUE_AT_ADDRESS,op,NULL);
1291 if (IS_PTR(type) && op->isaddr && force)
1294 type = copyLinkChain(type);
1296 IC_RESULT(ic) = newiTempOperand (type,1);
1297 IC_RESULT(ic)->isaddr = 0;
1299 /* ic->supportRtn = ((IS_GENPTR(type) | op->isGptr) & op->isaddr); */
1301 /* if the right is a symbol */
1302 if (op->type == SYMBOL)
1303 IC_RESULT(ic)->operand.symOperand->args =
1304 op->operand.symOperand->args ;
1307 return IC_RESULT(ic) ;
1310 /*-----------------------------------------------------------------*/
1311 /* geniCodeCast - changes the value from one type to another */
1312 /*-----------------------------------------------------------------*/
1313 operand *geniCodeCast (link *type, operand *op, bool implicit)
1317 link *opetype = getSpec(optype = operandType(op));
1320 /* one of them has size zero then error */
1321 if (IS_VOID(optype)) {
1322 werror(E_CAST_ZERO);
1326 /* if the operand is already the desired type then do nothing */
1327 if ( checkType (type,optype) == 1)
1330 /* if this is a literal then just change the type & return */
1331 if (IS_LITERAL(opetype) && !IS_PTR(type) && !IS_PTR(optype))
1332 return operandFromValue(valCastLiteral(type,
1333 operandLitValue(op)));
1335 /* if casting to some pointer type &&
1336 the destination is not a generic pointer
1337 then give a warning : (only for implicit casts)*/
1338 if (IS_PTR(optype) && implicit &&
1339 (DCL_TYPE(optype) != DCL_TYPE(type)) &&
1341 werror(E_INCOMPAT_CAST);
1342 werror(E_CONTINUE,"from type '");
1343 printTypeChain(optype,stderr);fprintf(stderr,"' to type '");
1344 printTypeChain(type,stderr);fprintf(stderr,"'\n");
1347 /* if they are the same size create an assignment */
1348 if (getSize(type) == getSize(optype) &&
1349 !IS_BITFIELD(type) &&
1351 !IS_FLOAT(optype) &&
1352 ((IS_SPEC(type) && IS_SPEC(optype)) ||
1353 (!IS_SPEC(type) && !IS_SPEC(optype)))) {
1355 ic = newiCode('=',NULL,op);
1356 IC_RESULT(ic) = newiTempOperand(type,0);
1357 SPIL_LOC(IC_RESULT(ic)) =
1358 (IS_TRUE_SYMOP(op) ? OP_SYMBOL(op) : NULL);
1359 IC_RESULT(ic)->isaddr = 0;
1361 ic = newiCode(CAST,operandFromLink(type),
1362 geniCodeRValue(op,FALSE));
1364 IC_RESULT(ic)= newiTempOperand(type,0);
1367 /* preserve the storage class & output class */
1368 /* of the original variable */
1369 restype = getSpec(operandType(IC_RESULT(ic)));
1370 SPEC_SCLS(restype) = SPEC_SCLS(opetype);
1371 SPEC_OCLS(restype) = SPEC_OCLS(opetype);
1374 return IC_RESULT(ic) ;
1377 /*-----------------------------------------------------------------*/
1378 /* geniCodeLabel - will create a Label */
1379 /*-----------------------------------------------------------------*/
1380 void geniCodeLabel (symbol *label)
1384 ic = newiCodeLabelGoto(LABEL,label);
1388 /*-----------------------------------------------------------------*/
1389 /* geniCodeGoto - will create a Goto */
1390 /*-----------------------------------------------------------------*/
1391 void geniCodeGoto (symbol *label)
1395 ic = newiCodeLabelGoto(GOTO,label);
1399 /*-----------------------------------------------------------------*/
1400 /* geniCodeMultiply - gen intermediate code for multiplication */
1401 /*-----------------------------------------------------------------*/
1402 operand *geniCodeMultiply (operand *left, operand *right)
1409 /* if they are both literal then we know the result */
1410 if (IS_LITERAL(letype) && IS_LITERAL(retype))
1411 return operandFromValue (valMult(left->operand.valOperand,
1412 right->operand.valOperand));
1414 resType = computeType (ltype,rtype) ;
1415 left = geniCodeCast(resType,left,TRUE);
1416 right= geniCodeCast(resType,right,TRUE);
1418 /* if the right is a literal & power of 2 */
1419 /* then make it a left shift */
1420 if (IS_LITERAL(retype) && !IS_FLOAT(letype) &&
1421 (p2 = powof2 ((unsigned long)floatFromVal(right->operand.valOperand))))
1422 ic = newiCode(LEFT_OP, left,operandFromLit(p2)); /* left shift */
1424 ic = newiCode('*',left,right); /* normal multiplication */
1425 /* if the size left or right > 1 then support routine */
1426 if (getSize(ltype) > 1 || getSize(rtype) > 1)
1430 IC_RESULT(ic) = newiTempOperand(resType,1);
1433 return IC_RESULT(ic) ;
1436 /*-----------------------------------------------------------------*/
1437 /* geniCodeDivision - gen intermediate code for division */
1438 /*-----------------------------------------------------------------*/
1439 operand *geniCodeDivision (operand *left, operand *right)
1444 link *rtype = operandType(right);
1445 link *retype= getSpec(rtype);
1446 link *ltype = operandType(left);
1447 link *letype= getSpec(ltype);
1449 resType = computeType (ltype,rtype) ;
1450 left = geniCodeCast(resType,left,TRUE);
1451 right= geniCodeCast(resType,right,TRUE);
1453 /* if the right is a literal & power of 2 */
1454 /* then make it a right shift */
1455 if (IS_LITERAL(retype) &&
1456 !IS_FLOAT(letype) &&
1457 (p2 = powof2 ((unsigned long)
1458 floatFromVal(right->operand.valOperand))))
1459 ic = newiCode(RIGHT_OP, left,operandFromLit(p2)); /* right shift */
1461 ic = newiCode('/',left,right); /* normal division */
1462 /* if the size left or right > 1 then support routine */
1463 if (getSize(ltype) > 1 || getSize(rtype) > 1)
1466 IC_RESULT(ic) = newiTempOperand(resType,0);
1469 return IC_RESULT(ic) ;
1471 /*-----------------------------------------------------------------*/
1472 /* geniCodeModulus - gen intermediate code for modulus */
1473 /*-----------------------------------------------------------------*/
1474 operand *geniCodeModulus (operand *left, operand *right)
1480 /* if they are both literal then we know the result */
1481 if (IS_LITERAL(letype) && IS_LITERAL(retype))
1482 return operandFromValue (valMod(left->operand.valOperand,
1483 right->operand.valOperand));
1485 resType = computeType (ltype,rtype) ;
1486 left = geniCodeCast(resType,left,TRUE);
1487 right= geniCodeCast(resType,right,TRUE);
1489 /* now they are the same size */
1490 ic = newiCode('%',left,right);
1492 /* if the size left or right > 1 then support routine */
1493 if (getSize(ltype) > 1 || getSize(rtype) > 1)
1495 IC_RESULT(ic) = newiTempOperand(resType,0);
1498 return IC_RESULT(ic) ;
1501 /*-----------------------------------------------------------------*/
1502 /* geniCodePtrPtrSubtract - subtracts pointer from pointer */
1503 /*-----------------------------------------------------------------*/
1504 operand *geniCodePtrPtrSubtract (operand *left, operand *right)
1510 /* if they are both literals then */
1511 if (IS_LITERAL(letype) && IS_LITERAL(retype)) {
1512 result = operandFromValue (valMinus(left->operand.valOperand,
1513 right->operand.valOperand));
1517 ic = newiCode('-',left,right);
1519 IC_RESULT(ic) = result = newiTempOperand(newIntLink(),1);
1523 return geniCodeDivision (result,
1524 operandFromLit(getSize(ltype->next)));
1527 /*-----------------------------------------------------------------*/
1528 /* geniCodeSubtract - generates code for subtraction */
1529 /*-----------------------------------------------------------------*/
1530 operand *geniCodeSubtract (operand *left, operand *right)
1537 /* if they both pointers then */
1538 if ((IS_PTR(ltype) || IS_ARRAY(ltype)) &&
1539 (IS_PTR(rtype) || IS_ARRAY(rtype)))
1540 return geniCodePtrPtrSubtract (left,right);
1542 /* if they are both literal then we know the result */
1543 if (IS_LITERAL(letype) && IS_LITERAL(retype))
1544 return operandFromValue (valMinus(left->operand.valOperand,
1545 right->operand.valOperand));
1547 /* if left is an array or pointer */
1548 if ( IS_PTR(ltype) || IS_ARRAY(ltype) ) {
1549 isarray = left->isaddr ;
1550 right = geniCodeMultiply (right,
1551 operandFromLit(getSize(ltype->next)));
1552 resType = copyLinkChain(IS_ARRAY(ltype) ? ltype->next : ltype);
1554 else { /* make them the same size */
1555 resType = computeType (ltype,rtype) ;
1556 left = geniCodeCast(resType,left,TRUE);
1557 right= geniCodeCast(resType,right,TRUE);
1560 ic = newiCode('-',left,right);
1562 IC_RESULT(ic)= newiTempOperand(resType,1);
1563 IC_RESULT(ic)->isaddr = (isarray ? 1 : 0);
1565 /* if left or right is a float */
1566 if (IS_FLOAT(ltype) || IS_FLOAT(rtype))
1570 return IC_RESULT(ic) ;
1573 /*-----------------------------------------------------------------*/
1574 /* geniCodeAdd - generates iCode for addition */
1575 /*-----------------------------------------------------------------*/
1576 operand *geniCodeAdd (operand *left, operand *right )
1584 /* if left is an array then array access */
1585 if (IS_ARRAY(ltype))
1586 return geniCodeArray (left,right);
1588 /* if the right side is LITERAL zero */
1589 /* return the left side */
1590 if (IS_LITERAL(retype) && !floatFromVal(valFromType(retype)))
1593 /* if left is literal zero return right */
1594 if (IS_LITERAL(letype) && !floatFromVal(valFromType(letype)))
1597 /* if left is an array or pointer then size */
1598 if (IS_PTR(ltype)) {
1600 isarray = left->isaddr;
1602 operandFromLit(getSize(ltype->next));
1603 right = geniCodeMultiply (right ,size);
1604 resType = copyLinkChain(ltype);
1606 else { /* make them the same size */
1607 resType = computeType (ltype,rtype) ;
1608 left = geniCodeCast(resType,left,TRUE);
1609 right= geniCodeCast(resType,right,TRUE);
1612 /* if they are both literals then we know */
1613 if (IS_LITERAL(letype) && IS_LITERAL(retype))
1614 return operandFromValue (valPlus(valFromType(letype),
1615 valFromType(retype)));
1617 ic = newiCode('+',left,right);
1619 IC_RESULT(ic) = newiTempOperand(resType,1);
1620 IC_RESULT(ic)->isaddr = ( isarray ? 1 : 0);
1622 /* if left or right is a float then support
1624 if (IS_FLOAT(ltype) || IS_FLOAT(rtype))
1629 return IC_RESULT(ic) ;
1633 /*-----------------------------------------------------------------*/
1634 /* aggrToPtr - changes an aggregate to pointer to an aggregate */
1635 /*-----------------------------------------------------------------*/
1636 link *aggrToPtr ( link *type, bool force)
1642 if (IS_PTR(type) && !force)
1645 etype = getSpec(type);
1649 /* if the output class is generic */
1650 if ((DCL_TYPE(ptype) = PTR_TYPE(SPEC_OCLS(etype))) == CPOINTER)
1651 DCL_PTR_CONST(ptype) = 1;
1653 /* if (SPEC_OCLS(etype) == generic) */
1654 /* DCL_TYPE(ptype) = GPOINTER; */
1656 /* if (SPEC_OCLS(etype)->codesp ) { */
1657 /* DCL_TYPE(ptype) = CPOINTER ; */
1658 /* DCL_PTR_CONST(ptype) = 1; */
1661 /* if (SPEC_OCLS(etype)->fmap && !SPEC_OCLS(etype)->paged) */
1662 /* DCL_TYPE(ptype) = FPOINTER ; */
1664 /* if (SPEC_OCLS(etype)->fmap && SPEC_OCLS(etype)->paged) */
1665 /* DCL_TYPE(ptype) = PPOINTER ; */
1667 /* if (SPEC_OCLS(etype) == idata) */
1668 /* DCL_TYPE(ptype) = IPOINTER; */
1670 /* DCL_TYPE(ptype) = POINTER ; */
1672 /* if the variable was declared a constant */
1673 /* then the pointer points to a constant */
1674 if (IS_CONSTANT(etype) )
1675 DCL_PTR_CONST(ptype) = 1;
1677 /* the variable was volatile then pointer to volatile */
1678 if (IS_VOLATILE(etype))
1679 DCL_PTR_VOLATILE(ptype) = 1;
1683 /*-----------------------------------------------------------------*/
1684 /* geniCodeArray2Ptr - array to pointer */
1685 /*-----------------------------------------------------------------*/
1686 operand *geniCodeArray2Ptr (operand *op)
1688 link *optype = operandType(op);
1689 link *opetype = getSpec(optype);
1691 if ((DCL_TYPE(optype) = PTR_TYPE(SPEC_OCLS(opetype))) == CPOINTER)
1692 DCL_PTR_CONST(optype) = 1;
1694 /* set the pointer depending on the storage class */
1695 /* if (SPEC_OCLS(opetype)->codesp ) { */
1696 /* DCL_TYPE(optype) = CPOINTER ; */
1697 /* DCL_PTR_CONST(optype) = 1; */
1700 /* if (SPEC_OCLS(opetype)->fmap && !SPEC_OCLS(opetype)->paged) */
1701 /* DCL_TYPE(optype) = FPOINTER ; */
1703 /* if (SPEC_OCLS(opetype)->fmap && SPEC_OCLS(opetype)->paged) */
1704 /* DCL_TYPE(optype) = PPOINTER ; */
1706 /* if (SPEC_OCLS(opetype) == idata) */
1707 /* DCL_TYPE(optype) = IPOINTER; */
1709 /* DCL_TYPE(optype) = POINTER ; */
1711 /* if the variable was declared a constant */
1712 /* then the pointer points to a constant */
1713 if (IS_CONSTANT(opetype) )
1714 DCL_PTR_CONST(optype) = 1;
1716 /* the variable was volatile then pointer to volatile */
1717 if (IS_VOLATILE(opetype))
1718 DCL_PTR_VOLATILE(optype) = 1;
1723 /*-----------------------------------------------------------------*/
1724 /* geniCodeArray - array access */
1725 /*-----------------------------------------------------------------*/
1726 operand *geniCodeArray (operand *left,operand *right)
1729 link *ltype = operandType(left);
1731 if (IS_PTR(ltype)) {
1732 return geniCodeDerefPtr(geniCodeAdd(left,right));
1736 right = geniCodeMultiply(right,
1737 operandFromLit(getSize(ltype->next)));
1739 /* we can check for limits here */
1740 if (isOperandLiteral(right) &&
1743 (operandLitValue(right)/getSize(ltype->next)) >= DCL_ELEM(ltype)) {
1744 werror(E_ARRAY_BOUND);
1745 right = operandFromLit(0);
1748 ic = newiCode('+',left,right);
1750 IC_RESULT(ic) = newiTempOperand(((IS_PTR(ltype) &&
1751 !IS_AGGREGATE(ltype->next) &&
1752 !IS_PTR(ltype->next))
1753 ? ltype : ltype->next),0);
1755 IC_RESULT(ic)->isaddr = (!IS_AGGREGATE(ltype->next));
1757 return IC_RESULT(ic) ;
1760 /*-----------------------------------------------------------------*/
1761 /* geniCodeStruct - generates intermediate code for structres */
1762 /*-----------------------------------------------------------------*/
1763 operand *geniCodeStruct (operand *left, operand *right, bool islval)
1766 link *type = operandType(left);
1767 link *etype = getSpec(type);
1769 symbol *element = getStructElement(SPEC_STRUCT(etype),
1770 right->operand.symOperand);
1772 /* add the offset */
1773 ic = newiCode('+',left,operandFromLit(element->offset));
1775 IC_RESULT(ic) = newiTempOperand(element->type,0);
1777 /* preserve the storage & output class of the struct */
1778 /* as well as the volatile attribute */
1779 retype = getSpec(operandType(IC_RESULT(ic)));
1780 SPEC_SCLS(retype) = SPEC_SCLS(etype);
1781 SPEC_OCLS(retype) = SPEC_OCLS(etype);
1782 SPEC_VOLATILE(retype) |= SPEC_VOLATILE(etype);
1784 if (IS_PTR(element->type))
1785 setOperandType(IC_RESULT(ic),aggrToPtr(operandType(IC_RESULT(ic)),TRUE));
1787 IC_RESULT(ic)->isaddr = (!IS_AGGREGATE(element->type));
1791 return (islval ? IC_RESULT(ic) : geniCodeRValue(IC_RESULT(ic),TRUE));
1794 /*-----------------------------------------------------------------*/
1795 /* geniCodePostInc - generate int code for Post increment */
1796 /*-----------------------------------------------------------------*/
1797 operand *geniCodePostInc (operand *op)
1801 link *optype = operandType(op);
1803 operand *rv = (IS_ITEMP(op) ?
1804 geniCodeRValue(op,(IS_PTR(optype) ? TRUE : FALSE)) :
1806 link *rvtype = operandType(rv);
1809 /* if this is not an address we have trouble */
1810 if ( ! op->isaddr ) {
1811 werror (E_LVALUE_REQUIRED,"++");
1815 rOp = newiTempOperand(rvtype,0);
1821 geniCodeAssign(rOp,rv,0);
1823 size = (IS_PTR(rvtype) ? getSize(rvtype->next) : 1);
1824 ic = newiCode('+',rv,operandFromLit(size));
1825 IC_RESULT(ic) = result =newiTempOperand(rvtype,0);
1828 geniCodeAssign(op,result,0);
1834 /*-----------------------------------------------------------------*/
1835 /* geniCodePreInc - generate code for preIncrement */
1836 /*-----------------------------------------------------------------*/
1837 operand *geniCodePreInc (operand *op)
1840 link *optype = operandType(op);
1841 operand *rop = (IS_ITEMP(op) ?
1842 geniCodeRValue (op,(IS_PTR(optype) ? TRUE : FALSE)) :
1844 link *roptype = operandType(rop);
1848 if ( ! op->isaddr ) {
1849 werror(E_LVALUE_REQUIRED,"++");
1854 size = (IS_PTR(roptype) ? getSize(roptype->next) : 1);
1855 ic = newiCode('+',rop,operandFromLit(size));
1856 IC_RESULT(ic) = result = newiTempOperand(roptype,0) ;
1860 return geniCodeAssign(op,result,0) ;
1863 /*-----------------------------------------------------------------*/
1864 /* geniCodePostDec - generates code for Post decrement */
1865 /*-----------------------------------------------------------------*/
1866 operand *geniCodePostDec (operand *op)
1870 link *optype = operandType(op);
1872 operand *rv = (IS_ITEMP(op) ?
1873 geniCodeRValue(op,(IS_PTR(optype) ? TRUE : FALSE)) :
1875 link *rvtype = operandType(rv);
1878 /* if this is not an address we have trouble */
1879 if ( ! op->isaddr ) {
1880 werror (E_LVALUE_REQUIRED,"++");
1884 rOp = newiTempOperand(rvtype,0);
1890 geniCodeAssign(rOp,rv,0);
1892 size = (IS_PTR(rvtype) ? getSize(rvtype->next) : 1);
1893 ic = newiCode('-',rv,operandFromLit(size));
1894 IC_RESULT(ic) = result =newiTempOperand(rvtype,0);
1897 geniCodeAssign(op,result,0);
1903 /*-----------------------------------------------------------------*/
1904 /* geniCodePreDec - generate code for pre decrement */
1905 /*-----------------------------------------------------------------*/
1906 operand *geniCodePreDec (operand *op)
1909 link *optype = operandType(op);
1910 operand *rop = (IS_ITEMP(op) ?
1911 geniCodeRValue (op,(IS_PTR(optype) ? TRUE : FALSE)) :
1913 link *roptype = operandType(rop);
1917 if ( ! op->isaddr ) {
1918 werror(E_LVALUE_REQUIRED,"++");
1923 size = (IS_PTR(roptype) ? getSize(roptype->next) : 1);
1924 ic = newiCode('-',rop,operandFromLit(size));
1925 IC_RESULT(ic) = result = newiTempOperand(roptype,0) ;
1929 return geniCodeAssign(op,result,0) ;
1933 /*-----------------------------------------------------------------*/
1934 /* geniCodeBitwise - gen int code for bitWise operators */
1935 /*-----------------------------------------------------------------*/
1936 operand *geniCodeBitwise (operand *left, operand *right,
1937 int oper, link *resType)
1941 left = geniCodeCast(resType,left,TRUE);
1942 right= geniCodeCast(resType,right,TRUE);
1944 ic = newiCode(oper,left,right);
1945 IC_RESULT(ic) = newiTempOperand(resType,0);
1948 return IC_RESULT(ic) ;
1951 /*-----------------------------------------------------------------*/
1952 /* geniCodeAddressOf - gens icode for '&' address of operator */
1953 /*-----------------------------------------------------------------*/
1954 operand *geniCodeAddressOf (operand *op)
1958 link *optype = operandType(op);
1959 link *opetype= getSpec(optype);
1961 /* this must be a lvalue */
1962 if (!op->isaddr && !IS_AGGREGATE(optype)) {
1963 werror (E_LVALUE_REQUIRED,"&");
1968 p->class = DECLARATOR ;
1970 if ((DCL_TYPE(p) = PTR_TYPE(SPEC_OCLS(opetype))) == CPOINTER)
1971 DCL_PTR_CONST(p) = 1;
1973 /* set the pointer depending on the storage class */
1974 /* if (SPEC_OCLS(opetype)->codesp ) { */
1975 /* DCL_TYPE(p) = CPOINTER ; */
1976 /* DCL_PTR_CONST(p) = 1; */
1979 /* if (SPEC_OCLS(opetype)->fmap && !SPEC_OCLS(opetype)->paged) */
1980 /* DCL_TYPE(p) = FPOINTER ; */
1982 /* if (SPEC_OCLS(opetype)->fmap && SPEC_OCLS(opetype)->paged) */
1983 /* DCL_TYPE(p) = PPOINTER ; */
1985 /* if (SPEC_OCLS(opetype) == idata) */
1986 /* DCL_TYPE(p) = IPOINTER; */
1988 /* if (SPEC_OCLS(opetype) == data || */
1989 /* SPEC_OCLS(opetype) == overlay) */
1990 /* DCL_TYPE(p) = POINTER ; */
1992 /* DCL_TYPE(p) = GPOINTER; */
1994 /* make sure we preserve the const & volatile */
1995 if (IS_CONSTANT(opetype))
1996 DCL_PTR_CONST(p) = 1;
1998 if (IS_VOLATILE(opetype))
1999 DCL_PTR_VOLATILE(p) = 1;
2001 p->next = copyLinkChain(optype);
2003 /* if already a temp */
2005 setOperandType (op,p);
2010 /* other wise make this of the type coming in */
2011 ic = newiCode(ADDRESS_OF,op,NULL);
2012 IC_RESULT(ic) = newiTempOperand(p,1);
2013 IC_RESULT(ic)->isaddr = 0;
2015 return IC_RESULT(ic);
2017 /*-----------------------------------------------------------------*/
2018 /* setOClass - sets the output class depending on the pointer type */
2019 /*-----------------------------------------------------------------*/
2020 void setOClass (link *ptr, link *spec)
2022 switch (DCL_TYPE(ptr)) {
2024 SPEC_OCLS(spec) = data ;
2028 SPEC_OCLS(spec) = generic;
2032 SPEC_OCLS(spec) = xdata ;
2036 SPEC_OCLS(spec) = code ;
2040 SPEC_OCLS(spec) = idata;
2044 SPEC_OCLS(spec) = xstack;
2049 /*-----------------------------------------------------------------*/
2050 /* geniCodeDerefPtr - dereference pointer with '*' */
2051 /*-----------------------------------------------------------------*/
2052 operand *geniCodeDerefPtr (operand *op)
2054 link *rtype , *retype ;
2055 link *optype = operandType(op);
2057 /* if this is a pointer then generate the rvalue */
2058 if (IS_PTR(optype)) {
2059 if (IS_TRUE_SYMOP(op)) {
2061 op = geniCodeRValue(op,TRUE);
2064 op = geniCodeRValue(op,TRUE);
2067 /* now get rid of the pointer part */
2068 if (lvaluereq && IS_ITEMP(op))
2069 retype = getSpec(rtype = copyLinkChain(optype)) ;
2071 retype = getSpec(rtype = copyLinkChain(optype->next)) ;
2073 /* if this is a pointer then outputclass needs 2b updated */
2075 setOClass(optype,retype);
2078 /* This block moved here from its original location
2079 * ten lines later by KV, 2/27/2000.
2081 * This allows code of the form "&array[const]" to
2085 op = geniCodeRValue(op, TRUE);
2087 op->isGptr = IS_GENPTR(optype);
2089 /* if the pointer was declared as a constant */
2090 /* then we cannot allow assignment to the derefed */
2091 if (IS_PTR_CONST(optype))
2092 SPEC_CONST(retype) = 1;
2094 op->isaddr = (IS_PTR(rtype) ||
2103 op = geniCodeRValue(op,TRUE);
2105 setOperandType(op,rtype);
2110 /*-----------------------------------------------------------------*/
2111 /* geniCodeUnaryMinus - does a unary minus of the operand */
2112 /*-----------------------------------------------------------------*/
2113 operand *geniCodeUnaryMinus (operand *op)
2116 link *optype = operandType(op);
2118 if (IS_LITERAL(optype))
2119 return operandFromLit(- floatFromVal(op->operand.valOperand));
2121 ic = newiCode(UNARYMINUS,op,NULL);
2122 IC_RESULT(ic) = newiTempOperand(optype,0);
2124 return IC_RESULT(ic);
2127 /*-----------------------------------------------------------------*/
2128 /* geniCodeLeftShift - gen i code for left shift */
2129 /*-----------------------------------------------------------------*/
2130 operand *geniCodeLeftShift (operand *left, operand *right)
2133 link *ltype = operandType(left);
2135 ic = newiCode(LEFT_OP,left,right);
2136 IC_RESULT(ic) = newiTempOperand(ltype,0);
2138 return IC_RESULT(ic) ;
2141 /*-----------------------------------------------------------------*/
2142 /* geniCodeRightShift - gen i code for right shift */
2143 /*-----------------------------------------------------------------*/
2144 operand *geniCodeRightShift (operand *left, operand *right)
2147 link *ltype = operandType(left);
2149 ic = newiCode(RIGHT_OP,left,right);
2150 IC_RESULT(ic) = newiTempOperand(ltype,0);
2152 return IC_RESULT(ic) ;
2156 #define LONG_LONG __int64
2158 #define LONG_LONG long long
2161 /*-----------------------------------------------------------------*/
2162 /* geniCodeLogic- logic code */
2163 /*-----------------------------------------------------------------*/
2164 operand *geniCodeLogic (operand *left, operand *right, int op )
2168 link *rtype = operandType(right);
2169 link *ltype = operandType(left);
2171 /* left is integral type and right is literal then
2172 check if the literal value is within bounds */
2173 if (IS_INTEGRAL(ltype) && IS_LITERAL(rtype)) {
2174 int nbits = bitsForType(ltype);
2175 long v = operandLitValue(right);
2177 if (v > ((LONG_LONG) 1 << nbits) && v > 0)
2178 werror(W_CONST_RANGE," compare operation ");
2181 ctype = computeType(ltype,rtype);
2182 left = geniCodeCast(ctype,left,TRUE);
2183 right= geniCodeCast(ctype,right,TRUE);
2185 ic = newiCode(op,left,right);
2186 IC_RESULT(ic) = newiTempOperand (newCharLink(),1);
2188 /* if comparing anything greater than one byte
2189 and not a '==' || '!=' || '&&' || '||' (these
2191 if (getSize(ctype) > 1 &&
2199 return IC_RESULT(ic);
2202 /*-----------------------------------------------------------------*/
2203 /* geniCodeUnary - for a a generic unary operation */
2204 /*-----------------------------------------------------------------*/
2205 operand *geniCodeUnary (operand *op, int oper )
2207 iCode *ic = newiCode (oper,op,NULL);
2209 IC_RESULT(ic)= newiTempOperand(operandType(op),0);
2211 return IC_RESULT(ic) ;
2214 /*-----------------------------------------------------------------*/
2215 /* geniCodeConditional - geniCode for '?' ':' operation */
2216 /*-----------------------------------------------------------------*/
2217 operand *geniCodeConditional (ast *tree)
2220 symbol *falseLabel = newiTempLabel(NULL);
2221 symbol *exitLabel = newiTempLabel(NULL);
2222 operand *cond = ast2iCode(tree->left);
2223 operand *true, *false , *result;
2225 ic = newiCodeCondition(geniCodeRValue(cond,FALSE),
2229 true = ast2iCode(tree->right->left);
2231 /* move the value to a new Operand */
2232 result = newiTempOperand(operandType(true),0);
2233 geniCodeAssign(result,geniCodeRValue(true,FALSE),0);
2235 /* generate an unconditional goto */
2236 geniCodeGoto(exitLabel);
2238 /* now for the right side */
2239 geniCodeLabel(falseLabel);
2241 false = ast2iCode(tree->right->right);
2242 geniCodeAssign(result,geniCodeRValue(false,FALSE),0);
2244 /* create the exit label */
2245 geniCodeLabel(exitLabel);
2250 /*-----------------------------------------------------------------*/
2251 /* geniCodeAssign - generate code for assignment */
2252 /*-----------------------------------------------------------------*/
2253 operand *geniCodeAssign (operand *left, operand *right, int nosupdate)
2256 link *ltype = operandType(left);
2257 link *rtype = operandType(right);
2259 if (!left->isaddr && !IS_ITEMP(left)) {
2260 werror(E_LVALUE_REQUIRED,"assignment");
2264 /* left is integral type and right is literal then
2265 check if the literal value is within bounds */
2266 if (IS_INTEGRAL(ltype) && IS_LITERAL(rtype)) {
2267 int nbits = bitsForType(ltype);
2268 long v = operandLitValue(right);
2270 if (v > ((LONG_LONG)1 << nbits) && v > 0)
2271 werror(W_CONST_RANGE," = operation");
2273 /* if the left & right type don't exactly match */
2274 /* if pointer set then make sure the check is
2275 done with the type & not the pointer */
2276 /* then cast rights type to left */
2278 /* first check the type for pointer assignement */
2279 if (left->isaddr && IS_PTR(ltype) && IS_ITEMP(left) &&
2280 checkType(ltype,rtype)<0) {
2281 if (checkType(ltype->next,rtype) < 0)
2282 right = geniCodeCast(ltype->next,right,TRUE);
2284 if (checkType(ltype,rtype) < 0 )
2285 right = geniCodeCast(ltype,right,TRUE);
2287 /* if left is a true symbol & ! volatile
2288 create an assignment to temporary for
2289 the right & then assign this temporary
2290 to the symbol this is SSA . isn't it simple
2291 and folks have published mountains of paper on it */
2292 if (IS_TRUE_SYMOP(left) &&
2293 !isOperandVolatile(left,FALSE) &&
2294 isOperandGlobal(left)) {
2297 if (IS_TRUE_SYMOP(right))
2298 sym = OP_SYMBOL(right);
2299 ic = newiCode('=',NULL,right);
2300 IC_RESULT(ic) = right = newiTempOperand(ltype,0);
2301 SPIL_LOC(right) = sym ;
2305 ic = newiCode('=',NULL,right);
2306 IC_RESULT(ic) = left;
2309 /* if left isgptr flag is set then support
2310 routine will be required */
2314 ic->nosupdate = nosupdate;
2318 /*-----------------------------------------------------------------*/
2319 /* geniCodeSEParms - generate code for side effecting fcalls */
2320 /*-----------------------------------------------------------------*/
2321 static void geniCodeSEParms (ast *parms)
2326 if (parms->type == EX_OP && parms->opval.op == PARAM) {
2327 geniCodeSEParms (parms->left) ;
2328 geniCodeSEParms (parms->right);
2332 /* hack don't like this but too lazy to think of
2334 if (IS_ADDRESS_OF_OP(parms))
2335 parms->left->lvalue = 1;
2337 if (IS_CAST_OP(parms) &&
2338 IS_PTR(parms->ftype) &&
2339 IS_ADDRESS_OF_OP(parms->right))
2340 parms->right->left->lvalue = 1;
2342 parms->opval.oprnd =
2343 geniCodeRValue(ast2iCode (parms),FALSE);
2345 parms->type = EX_OPERAND ;
2348 /*-----------------------------------------------------------------*/
2349 /* geniCodeParms - generates parameters */
2350 /*-----------------------------------------------------------------*/
2351 static void geniCodeParms ( ast *parms , int *stack, link *fetype)
2359 /* if this is a param node then do the left & right */
2360 if (parms->type == EX_OP && parms->opval.op == PARAM) {
2361 geniCodeParms (parms->left, stack,fetype) ;
2362 geniCodeParms (parms->right, stack,fetype);
2366 /* get the parameter value */
2367 if (parms->type == EX_OPERAND)
2368 pval = parms->opval.oprnd ;
2370 /* maybe this else should go away ?? */
2371 /* hack don't like this but too lazy to think of
2373 if (IS_ADDRESS_OF_OP(parms))
2374 parms->left->lvalue = 1;
2376 if (IS_CAST_OP(parms) &&
2377 IS_PTR(parms->ftype) &&
2378 IS_ADDRESS_OF_OP(parms->right))
2379 parms->right->left->lvalue = 1;
2381 pval = geniCodeRValue(ast2iCode (parms),FALSE);
2384 /* if register parm then make it a send */
2385 if ((parms->argSym && IS_REGPARM(parms->argSym->etype)) ||
2386 IS_REGPARM(parms->etype)) {
2387 ic = newiCode(SEND,pval,NULL);
2390 /* now decide whether to push or assign */
2391 if (!(options.stackAuto || IS_RENT(fetype))) {
2394 operand *top = operandFromSymbol(parms->argSym);
2395 geniCodeAssign(top,pval,1);
2398 link *p = operandType(pval);
2400 ic = newiCode(IPUSH,pval,NULL);
2402 /* update the stack adjustment */
2403 *stack += getSize(IS_AGGREGATE(p)? aggrToPtr(p,FALSE):p);
2410 /*-----------------------------------------------------------------*/
2411 /* geniCodeCall - generates temp code for calling */
2412 /*-----------------------------------------------------------------*/
2413 operand *geniCodeCall (operand *left, ast *parms)
2420 /* take care of parameters with side-effecting
2421 function calls in them, this is required to take care
2422 of overlaying function parameters */
2423 geniCodeSEParms ( parms );
2425 /* first the parameters */
2426 geniCodeParms ( parms , &stack , getSpec(operandType(left)));
2428 /* now call : if symbol then pcall */
2430 ic = newiCode(PCALL,left,NULL);
2432 ic = newiCode(CALL,left,NULL);
2434 IC_ARGS(ic) = left->operand.symOperand->args ;
2435 type = copyLinkChain(operandType(left)->next);
2436 etype = getSpec(type);
2437 SPEC_EXTR(etype) = 0;
2438 IC_RESULT(ic) = result = newiTempOperand(type,1);
2442 /* stack adjustment after call */
2443 left->parmBytes = stack;
2448 /*-----------------------------------------------------------------*/
2449 /* geniCodeReceive - generate intermediate code for "receive" */
2450 /*-----------------------------------------------------------------*/
2451 static void geniCodeReceive (value *args)
2453 /* for all arguments that are passed in registers */
2456 if (IS_REGPARM(args->etype)) {
2457 operand *opr = operandFromValue(args);
2459 symbol *sym = OP_SYMBOL(opr);
2462 /* we will use it after all optimizations
2463 and before liveRange calculation */
2464 if (!sym->addrtaken &&
2465 !IS_VOLATILE(sym->etype) &&
2466 !IN_FARSPACE(SPEC_OCLS(sym->etype))) {
2467 opl = newiTempOperand(args->type,0);
2469 sym->reqv->key = sym->key ;
2470 OP_SYMBOL(sym->reqv)->key = sym->key;
2471 OP_SYMBOL(sym->reqv)->isreqv = 1;
2472 OP_SYMBOL(sym->reqv)->islocal= 0;
2473 SPIL_LOC(sym->reqv) = sym;
2476 ic = newiCode(RECEIVE,NULL,NULL);
2477 currFunc->recvSize = getSize(sym->etype);
2478 IC_RESULT(ic) = opr;
2486 /*-----------------------------------------------------------------*/
2487 /* geniCodeFunctionBody - create the function body */
2488 /*-----------------------------------------------------------------*/
2489 void geniCodeFunctionBody (ast *tree)
2496 /* reset the auto generation */
2502 func = ast2iCode(tree->left);
2503 fetype = getSpec(operandType(func));
2505 savelineno = lineno;
2506 lineno = OP_SYMBOL(func)->lineDef;
2507 /* create an entry label */
2508 geniCodeLabel(entryLabel);
2509 lineno = savelineno;
2511 /* create a proc icode */
2512 ic = newiCode(FUNCTION,func,NULL);
2513 /* if the function has parmas then */
2514 /* save the parameters information */
2515 ic->argLabel.args = tree->values.args ;
2516 ic->lineno = OP_SYMBOL(func)->lineDef;
2520 /* for all parameters that are passed
2521 on registers add a "receive" */
2522 geniCodeReceive( tree->values.args );
2524 /* generate code for the body */
2525 ast2iCode(tree->right);
2527 /* create a label for return */
2528 geniCodeLabel(returnLabel);
2530 /* now generate the end proc */
2531 ic = newiCode(ENDFUNCTION,func,NULL);
2536 /*-----------------------------------------------------------------*/
2537 /* geniCodeReturn - gen icode for 'return' statement */
2538 /*-----------------------------------------------------------------*/
2539 void geniCodeReturn (operand *op)
2543 /* if the operand is present force an rvalue */
2545 op = geniCodeRValue(op,FALSE);
2547 ic = newiCode(RETURN,op,NULL);
2551 /*-----------------------------------------------------------------*/
2552 /* geniCodeIfx - generates code for extended if statement */
2553 /*-----------------------------------------------------------------*/
2554 void geniCodeIfx (ast *tree)
2557 operand *condition = ast2iCode(tree->left);
2560 /* if condition is null then exit */
2564 condition = geniCodeRValue(condition,FALSE);
2566 cetype = getSpec(operandType(condition));
2567 /* if the condition is a literal */
2568 if (IS_LITERAL(cetype)) {
2569 if (floatFromVal(condition->operand.valOperand)) {
2570 if (tree->trueLabel)
2571 geniCodeGoto(tree->trueLabel);
2576 if (tree->falseLabel)
2577 geniCodeGoto (tree->falseLabel);
2584 if ( tree->trueLabel ) {
2585 ic = newiCodeCondition(condition,
2590 if ( tree->falseLabel)
2591 geniCodeGoto(tree->falseLabel);
2594 ic = newiCodeCondition (condition,
2601 ast2iCode(tree->right);
2604 /*-----------------------------------------------------------------*/
2605 /* geniCodeJumpTable - tries to create a jump table for switch */
2606 /*-----------------------------------------------------------------*/
2607 int geniCodeJumpTable (operand *cond, value *caseVals, ast *tree)
2609 int min = 0 ,max = 0, t, cnt = 0;
2614 set *labels = NULL ;
2616 if (!tree || !caseVals)
2619 /* the criteria for creating a jump table is */
2620 /* all integer numbers between the maximum & minimum must */
2621 /* be present , the maximum value should not exceed 255 */
2622 min = max = (int)floatFromVal(vch = caseVals);
2623 sprintf(buffer,"_case_%d_%d",
2624 tree->values.switchVals.swNum,
2626 addSet(&labels,newiTempLabel(buffer));
2628 /* if there is only one case value then no need */
2629 if (!(vch = vch->next ))
2633 if (((t = (int)floatFromVal(vch)) - max) != 1)
2635 sprintf(buffer,"_case_%d_%d",
2636 tree->values.switchVals.swNum,
2638 addSet(&labels,newiTempLabel(buffer));
2644 /* if the number of case statements <= 2 then */
2645 /* it is not economical to create the jump table */
2646 /* since two compares are needed for boundary conditions */
2647 if ((! optimize.noJTabBoundary && cnt <= 2) || max > (255/3))
2650 if ( tree->values.switchVals.swDefault )
2651 sprintf (buffer,"_default_%d",tree->values.switchVals.swNum);
2653 sprintf (buffer,"_swBrk_%d",tree->values.switchVals.swNum );
2655 falseLabel = newiTempLabel (buffer);
2657 /* so we can create a jumptable */
2658 /* first we rule out the boundary conditions */
2659 /* if only optimization says so */
2660 if ( ! optimize.noJTabBoundary ) {
2661 link *cetype = getSpec(operandType(cond));
2662 /* no need to check the lower bound if
2663 the condition is unsigned & minimum value is zero */
2664 if (!( min == 0 && SPEC_USIGN(cetype))) {
2665 boundary = geniCodeLogic (cond,operandFromLit(min),'<');
2666 ic = newiCodeCondition (boundary,falseLabel,NULL);
2670 /* now for upper bounds */
2671 boundary = geniCodeLogic(cond,operandFromLit(max),'>');
2672 ic = newiCodeCondition (boundary,falseLabel,NULL);
2676 /* if the min is not zero then we no make it zero */
2678 cond = geniCodeSubtract(cond,operandFromLit(min));
2679 setOperandType(cond, UCHARTYPE);
2682 /* now create the jumptable */
2683 ic = newiCode(JUMPTABLE,NULL,NULL);
2684 IC_JTCOND(ic) = cond;
2685 IC_JTLABELS(ic) = labels;
2690 /*-----------------------------------------------------------------*/
2691 /* geniCodeSwitch - changes a switch to a if statement */
2692 /*-----------------------------------------------------------------*/
2693 void geniCodeSwitch (ast *tree)
2696 operand *cond = geniCodeRValue(ast2iCode (tree->left),FALSE);
2697 value *caseVals = tree->values.switchVals.swVals ;
2698 symbol *trueLabel , *falseLabel;
2700 /* if we can make this a jump table */
2701 if ( geniCodeJumpTable (cond,caseVals,tree) )
2702 goto jumpTable ; /* no need for the comparison */
2704 /* for the cases defined do */
2707 operand *compare = geniCodeLogic (cond,
2708 operandFromValue(caseVals),
2711 sprintf(buffer,"_case_%d_%d",
2712 tree->values.switchVals.swNum,
2713 (int) floatFromVal(caseVals));
2714 trueLabel = newiTempLabel(buffer);
2716 ic = newiCodeCondition(compare,trueLabel,NULL);
2718 caseVals = caseVals->next;
2723 /* if default is present then goto break else break */
2724 if ( tree->values.switchVals.swDefault )
2725 sprintf (buffer,"_default_%d",tree->values.switchVals.swNum);
2727 sprintf (buffer,"_swBrk_%d",tree->values.switchVals.swNum );
2729 falseLabel = newiTempLabel (buffer);
2730 geniCodeGoto(falseLabel);
2733 ast2iCode(tree->right);
2736 /*-----------------------------------------------------------------*/
2737 /* geniCodeInline - intermediate code for inline assembler */
2738 /*-----------------------------------------------------------------*/
2739 static void geniCodeInline (ast *tree)
2743 ic = newiCode(INLINEASM,NULL,NULL);
2744 IC_INLINE(ic) = tree->values.inlineasm;
2748 /*-----------------------------------------------------------------*/
2749 /* ast2iCode - creates an icodeList from an ast */
2750 /*-----------------------------------------------------------------*/
2751 operand *ast2iCode (ast *tree)
2753 operand *left = NULL;
2754 operand *right= NULL;
2759 /* set the global variables for filename & line number */
2760 if ( tree->filename )
2761 filename = tree->filename ;
2763 lineno = tree->lineno ;
2765 block = tree->block ;
2767 scopeLevel = tree->level;
2769 if (tree->type == EX_VALUE )
2770 return operandFromValue(tree->opval.val);
2772 if (tree->type == EX_LINK )
2773 return operandFromLink (tree->opval.lnk);
2775 /* if we find a nullop */
2776 if (tree->type == EX_OP &&
2777 ( tree->opval.op == NULLOP ||
2778 tree->opval.op == BLOCK )) {
2779 ast2iCode (tree->left);
2780 ast2iCode (tree->right);
2784 /* special cases for not evaluating */
2785 if ( tree->opval.op != ':' &&
2786 tree->opval.op != '?' &&
2787 tree->opval.op != CALL &&
2788 tree->opval.op != IFX &&
2789 tree->opval.op != LABEL &&
2790 tree->opval.op != GOTO &&
2791 tree->opval.op != SWITCH &&
2792 tree->opval.op != FUNCTION &&
2793 tree->opval.op != INLINEASM ) {
2794 if (IS_ASSIGN_OP(tree->opval.op) ||
2795 IS_DEREF_OP(tree) ||
2796 tree->opval.op == PTR_OP) {
2798 left = operandFromAst(tree->left);
2801 left = operandFromAst(tree->left);
2803 if (tree->opval.op == INC_OP || tree->opval.op == DEC_OP) {
2805 right= operandFromAst(tree->right);
2808 right= operandFromAst(tree->right);
2812 /* now depending on the type of operand */
2813 /* this will be a biggy */
2814 switch (tree->opval.op) {
2816 case '[' : /* array operation */
2817 left= geniCodeRValue (left,FALSE);
2818 right=geniCodeRValue (right,TRUE);
2820 return geniCodeArray (left,right);
2822 case '.' : /* structure dereference */
2823 if (IS_PTR(operandType(left)))
2824 left = geniCodeRValue(left,TRUE);
2826 left = geniCodeRValue(left,FALSE);
2828 return geniCodeStruct (left,right,tree->lvalue);
2830 case PTR_OP: /* structure pointer dereference */
2833 pType = operandType(left);
2834 left = geniCodeRValue(left,TRUE);
2836 setOClass (pType,getSpec(operandType(left)));
2839 return geniCodeStruct (left, right,tree->lvalue);
2841 case INC_OP: /* increment operator */
2843 return geniCodePostInc (left);
2845 return geniCodePreInc (right);
2847 case DEC_OP: /* decrement operator */
2849 return geniCodePostDec (left);
2851 return geniCodePreDec (right);
2853 case '&' : /* bitwise and or address of operator */
2854 if ( right ) { /* this is a bitwise operator */
2855 left= geniCodeRValue(left,FALSE);
2856 right= geniCodeRValue(right,FALSE);
2857 return geniCodeBitwise (left,right,BITWISEAND,tree->ftype);
2859 return geniCodeAddressOf (left);
2861 case '|': /* bitwise or & xor */
2863 return geniCodeBitwise (geniCodeRValue(left,FALSE),
2864 geniCodeRValue(right,FALSE),
2869 return geniCodeDivision (geniCodeRValue(left,FALSE),
2870 geniCodeRValue(right,FALSE));
2873 return geniCodeModulus (geniCodeRValue(left,FALSE),
2874 geniCodeRValue(right,FALSE));
2877 return geniCodeMultiply (geniCodeRValue(left,FALSE),
2878 geniCodeRValue(right,FALSE));
2880 return geniCodeDerefPtr (geniCodeRValue(left,FALSE));
2884 return geniCodeSubtract (geniCodeRValue(left,FALSE),
2885 geniCodeRValue(right,FALSE));
2887 return geniCodeUnaryMinus (geniCodeRValue(left,FALSE));
2891 return geniCodeAdd (geniCodeRValue(left,FALSE),
2892 geniCodeRValue(right,FALSE));
2894 return geniCodeRValue(left,FALSE) ; /* unary '+' has no meaning */
2897 return geniCodeLeftShift (geniCodeRValue(left,FALSE),
2898 geniCodeRValue(right,FALSE));
2901 return geniCodeRightShift (geniCodeRValue(left,FALSE),
2902 geniCodeRValue(right,FALSE));
2904 return geniCodeCast (operandType(left),
2905 geniCodeRValue(right,FALSE),FALSE);
2911 return geniCodeUnary (geniCodeRValue(left,FALSE),tree->opval.op);
2915 operand *op = geniCodeUnary (geniCodeRValue(left,FALSE),tree->opval.op);
2916 setOperandType(op, UCHARTYPE);
2927 return geniCodeLogic (geniCodeRValue(left,FALSE),
2928 geniCodeRValue(right,FALSE),
2931 return geniCodeConditional (tree);
2934 return operandFromLit(getSize(tree->right->ftype));
2938 link *rtype = operandType(right);
2939 link *ltype = operandType(left);
2940 if (IS_PTR(rtype) && IS_ITEMP(right)
2941 && right->isaddr && checkType(rtype->next,ltype)==1)
2942 right = geniCodeRValue(right,TRUE);
2944 right = geniCodeRValue(right,FALSE);
2946 geniCodeAssign (left,right,0);
2951 geniCodeAssign(left,
2952 geniCodeMultiply(geniCodeRValue (operandFromOperand(left),
2954 geniCodeRValue(right,FALSE)),0);
2958 geniCodeAssign(left,
2959 geniCodeDivision(geniCodeRValue(operandFromOperand(left),
2961 geniCodeRValue(right,FALSE)),0);
2964 geniCodeAssign(left,
2965 geniCodeModulus(geniCodeRValue(operandFromOperand(left),
2967 geniCodeRValue(right,FALSE)),0);
2970 link *rtype = operandType(right);
2971 link *ltype = operandType(left);
2972 if (IS_PTR(rtype) && IS_ITEMP(right)
2973 && right->isaddr && checkType(rtype->next,ltype)==1)
2974 right = geniCodeRValue(right,TRUE);
2976 right = geniCodeRValue(right,FALSE);
2979 return geniCodeAssign(left,
2980 geniCodeAdd (geniCodeRValue(operandFromOperand(left),
2986 link *rtype = operandType(right);
2987 link *ltype = operandType(left);
2988 if (IS_PTR(rtype) && IS_ITEMP(right)
2989 && right->isaddr && checkType(rtype->next,ltype)==1) {
2990 right = geniCodeRValue(right,TRUE);
2993 right = geniCodeRValue(right,FALSE);
2996 geniCodeAssign (left,
2997 geniCodeSubtract(geniCodeRValue(operandFromOperand(left),
3003 geniCodeAssign (left,
3004 geniCodeLeftShift(geniCodeRValue(operandFromOperand(left)
3006 geniCodeRValue(right,FALSE)),0);
3009 geniCodeAssign(left,
3010 geniCodeRightShift(geniCodeRValue(operandFromOperand(left)
3012 geniCodeRValue(right,FALSE)),0);
3015 geniCodeAssign (left,
3016 geniCodeBitwise(geniCodeRValue(operandFromOperand(left),
3018 geniCodeRValue(right,FALSE),
3020 operandType(left)),0);
3023 geniCodeAssign (left,
3024 geniCodeBitwise (geniCodeRValue(operandFromOperand(left),
3026 geniCodeRValue(right,FALSE),
3028 operandType(left)),0);
3031 geniCodeAssign (left,
3032 geniCodeBitwise (geniCodeRValue(operandFromOperand(left)
3034 geniCodeRValue(right,FALSE),
3036 operandType(left)),0);
3038 return geniCodeRValue(right,FALSE);
3041 return geniCodeCall (ast2iCode(tree->left),
3044 geniCodeLabel(ast2iCode(tree->left)->operand.symOperand);
3045 return ast2iCode (tree->right);
3048 geniCodeGoto (ast2iCode(tree->left)->operand.symOperand);
3049 return ast2iCode (tree->right);
3052 geniCodeFunctionBody ( tree );
3056 geniCodeReturn (right);
3064 geniCodeSwitch (tree);
3068 geniCodeInline (tree);
3075 /*-----------------------------------------------------------------*/
3076 /* reverseICChain - gets from the list and creates a linkedlist */
3077 /*-----------------------------------------------------------------*/
3078 iCode *reverseiCChain ()
3080 iCode *loop = NULL ;
3081 iCode *prev = NULL ;
3083 while ((loop = getSet(&iCodeChain))) {
3094 /*-----------------------------------------------------------------*/
3095 /* iCodeFromAst - given an ast will convert it to iCode */
3096 /*-----------------------------------------------------------------*/
3097 iCode *iCodeFromAst ( ast *tree )
3099 returnLabel = newiTempLabel("_return");
3100 entryLabel = newiTempLabel("_entry") ;
3102 return reverseiCChain ();