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 op->isGptr = IS_GENPTR(optype);
2080 /* if the pointer was declared as a constant */
2081 /* then we cannot allow assignment to the derefed */
2082 if (IS_PTR_CONST(optype))
2083 SPEC_CONST(retype) = 1;
2085 op->isaddr = (IS_PTR(rtype) ||
2092 op = geniCodeRValue(op,TRUE);
2093 setOperandType(op,rtype);
2098 /*-----------------------------------------------------------------*/
2099 /* geniCodeUnaryMinus - does a unary minus of the operand */
2100 /*-----------------------------------------------------------------*/
2101 operand *geniCodeUnaryMinus (operand *op)
2104 link *optype = operandType(op);
2106 if (IS_LITERAL(optype))
2107 return operandFromLit(- floatFromVal(op->operand.valOperand));
2109 ic = newiCode(UNARYMINUS,op,NULL);
2110 IC_RESULT(ic) = newiTempOperand(optype,0);
2112 return IC_RESULT(ic);
2115 /*-----------------------------------------------------------------*/
2116 /* geniCodeLeftShift - gen i code for left shift */
2117 /*-----------------------------------------------------------------*/
2118 operand *geniCodeLeftShift (operand *left, operand *right)
2121 link *ltype = operandType(left);
2123 ic = newiCode(LEFT_OP,left,right);
2124 IC_RESULT(ic) = newiTempOperand(ltype,0);
2126 return IC_RESULT(ic) ;
2129 /*-----------------------------------------------------------------*/
2130 /* geniCodeRightShift - gen i code for right shift */
2131 /*-----------------------------------------------------------------*/
2132 operand *geniCodeRightShift (operand *left, operand *right)
2135 link *ltype = operandType(left);
2137 ic = newiCode(RIGHT_OP,left,right);
2138 IC_RESULT(ic) = newiTempOperand(ltype,0);
2140 return IC_RESULT(ic) ;
2144 #define LONG_LONG __int64
2146 #define LONG_LONG long long
2149 /*-----------------------------------------------------------------*/
2150 /* geniCodeLogic- logic code */
2151 /*-----------------------------------------------------------------*/
2152 operand *geniCodeLogic (operand *left, operand *right, int op )
2156 link *rtype = operandType(right);
2157 link *ltype = operandType(left);
2159 /* left is integral type and right is literal then
2160 check if the literal value is within bounds */
2161 if (IS_INTEGRAL(ltype) && IS_LITERAL(rtype)) {
2162 int nbits = bitsForType(ltype);
2163 long v = operandLitValue(right);
2165 if (v > ((LONG_LONG) 1 << nbits) && v > 0)
2166 werror(W_CONST_RANGE," compare operation ");
2169 ctype = computeType(ltype,rtype);
2170 left = geniCodeCast(ctype,left,TRUE);
2171 right= geniCodeCast(ctype,right,TRUE);
2173 ic = newiCode(op,left,right);
2174 IC_RESULT(ic) = newiTempOperand (newCharLink(),1);
2176 /* if comparing anything greater than one byte
2177 and not a '==' || '!=' || '&&' || '||' (these
2179 if (getSize(ctype) > 1 &&
2187 return IC_RESULT(ic);
2190 /*-----------------------------------------------------------------*/
2191 /* geniCodeUnary - for a a generic unary operation */
2192 /*-----------------------------------------------------------------*/
2193 operand *geniCodeUnary (operand *op, int oper )
2195 iCode *ic = newiCode (oper,op,NULL);
2197 IC_RESULT(ic)= newiTempOperand(operandType(op),0);
2199 return IC_RESULT(ic) ;
2202 /*-----------------------------------------------------------------*/
2203 /* geniCodeConditional - geniCode for '?' ':' operation */
2204 /*-----------------------------------------------------------------*/
2205 operand *geniCodeConditional (ast *tree)
2208 symbol *falseLabel = newiTempLabel(NULL);
2209 symbol *exitLabel = newiTempLabel(NULL);
2210 operand *cond = ast2iCode(tree->left);
2211 operand *true, *false , *result;
2213 ic = newiCodeCondition(geniCodeRValue(cond,FALSE),
2217 true = ast2iCode(tree->right->left);
2219 /* move the value to a new Operand */
2220 result = newiTempOperand(operandType(true),0);
2221 geniCodeAssign(result,geniCodeRValue(true,FALSE),0);
2223 /* generate an unconditional goto */
2224 geniCodeGoto(exitLabel);
2226 /* now for the right side */
2227 geniCodeLabel(falseLabel);
2229 false = ast2iCode(tree->right->right);
2230 geniCodeAssign(result,geniCodeRValue(false,FALSE),0);
2232 /* create the exit label */
2233 geniCodeLabel(exitLabel);
2238 /*-----------------------------------------------------------------*/
2239 /* geniCodeAssign - generate code for assignment */
2240 /*-----------------------------------------------------------------*/
2241 operand *geniCodeAssign (operand *left, operand *right, int nosupdate)
2244 link *ltype = operandType(left);
2245 link *rtype = operandType(right);
2247 if (!left->isaddr && !IS_ITEMP(left)) {
2248 werror(E_LVALUE_REQUIRED,"assignment");
2252 /* left is integral type and right is literal then
2253 check if the literal value is within bounds */
2254 if (IS_INTEGRAL(ltype) && IS_LITERAL(rtype)) {
2255 int nbits = bitsForType(ltype);
2256 long v = operandLitValue(right);
2258 if (v > ((LONG_LONG)1 << nbits) && v > 0)
2259 werror(W_CONST_RANGE," = operation");
2261 /* if the left & right type don't exactly match */
2262 /* if pointer set then make sure the check is
2263 done with the type & not the pointer */
2264 /* then cast rights type to left */
2266 /* first check the type for pointer assignement */
2267 if (left->isaddr && IS_PTR(ltype) && IS_ITEMP(left) &&
2268 checkType(ltype,rtype)<0) {
2269 if (checkType(ltype->next,rtype) < 0)
2270 right = geniCodeCast(ltype->next,right,TRUE);
2272 if (checkType(ltype,rtype) < 0 )
2273 right = geniCodeCast(ltype,right,TRUE);
2275 /* if left is a true symbol & ! volatile
2276 create an assignment to temporary for
2277 the right & then assign this temporary
2278 to the symbol this is SSA . isn't it simple
2279 and folks have published mountains of paper on it */
2280 if (IS_TRUE_SYMOP(left) &&
2281 !isOperandVolatile(left,FALSE) &&
2282 isOperandGlobal(left)) {
2285 if (IS_TRUE_SYMOP(right))
2286 sym = OP_SYMBOL(right);
2287 ic = newiCode('=',NULL,right);
2288 IC_RESULT(ic) = right = newiTempOperand(ltype,0);
2289 SPIL_LOC(right) = sym ;
2293 ic = newiCode('=',NULL,right);
2294 IC_RESULT(ic) = left;
2297 /* if left isgptr flag is set then support
2298 routine will be required */
2302 ic->nosupdate = nosupdate;
2306 /*-----------------------------------------------------------------*/
2307 /* geniCodeSEParms - generate code for side effecting fcalls */
2308 /*-----------------------------------------------------------------*/
2309 static void geniCodeSEParms (ast *parms)
2314 if (parms->type == EX_OP && parms->opval.op == PARAM) {
2315 geniCodeSEParms (parms->left) ;
2316 geniCodeSEParms (parms->right);
2320 /* hack don't like this but too lazy to think of
2322 if (IS_ADDRESS_OF_OP(parms))
2323 parms->left->lvalue = 1;
2325 if (IS_CAST_OP(parms) &&
2326 IS_PTR(parms->ftype) &&
2327 IS_ADDRESS_OF_OP(parms->right))
2328 parms->right->left->lvalue = 1;
2330 parms->opval.oprnd =
2331 geniCodeRValue(ast2iCode (parms),FALSE);
2333 parms->type = EX_OPERAND ;
2336 /*-----------------------------------------------------------------*/
2337 /* geniCodeParms - generates parameters */
2338 /*-----------------------------------------------------------------*/
2339 static void geniCodeParms ( ast *parms , int *stack, link *fetype)
2347 /* if this is a param node then do the left & right */
2348 if (parms->type == EX_OP && parms->opval.op == PARAM) {
2349 geniCodeParms (parms->left, stack,fetype) ;
2350 geniCodeParms (parms->right, stack,fetype);
2354 /* get the parameter value */
2355 if (parms->type == EX_OPERAND)
2356 pval = parms->opval.oprnd ;
2358 /* maybe this else should go away ?? */
2359 /* hack don't like this but too lazy to think of
2361 if (IS_ADDRESS_OF_OP(parms))
2362 parms->left->lvalue = 1;
2364 if (IS_CAST_OP(parms) &&
2365 IS_PTR(parms->ftype) &&
2366 IS_ADDRESS_OF_OP(parms->right))
2367 parms->right->left->lvalue = 1;
2369 pval = geniCodeRValue(ast2iCode (parms),FALSE);
2372 /* if register parm then make it a send */
2373 if ((parms->argSym && IS_REGPARM(parms->argSym->etype)) ||
2374 IS_REGPARM(parms->etype)) {
2375 ic = newiCode(SEND,pval,NULL);
2378 /* now decide whether to push or assign */
2379 if (!(options.stackAuto || IS_RENT(fetype))) {
2382 operand *top = operandFromSymbol(parms->argSym);
2383 geniCodeAssign(top,pval,1);
2386 link *p = operandType(pval);
2388 ic = newiCode(IPUSH,pval,NULL);
2390 /* update the stack adjustment */
2391 *stack += getSize(IS_AGGREGATE(p)? aggrToPtr(p,FALSE):p);
2398 /*-----------------------------------------------------------------*/
2399 /* geniCodeCall - generates temp code for calling */
2400 /*-----------------------------------------------------------------*/
2401 operand *geniCodeCall (operand *left, ast *parms)
2408 /* take care of parameters with side-effecting
2409 function calls in them, this is required to take care
2410 of overlaying function parameters */
2411 geniCodeSEParms ( parms );
2413 /* first the parameters */
2414 geniCodeParms ( parms , &stack , getSpec(operandType(left)));
2416 /* now call : if symbol then pcall */
2418 ic = newiCode(PCALL,left,NULL);
2420 ic = newiCode(CALL,left,NULL);
2422 IC_ARGS(ic) = left->operand.symOperand->args ;
2423 type = copyLinkChain(operandType(left)->next);
2424 etype = getSpec(type);
2425 SPEC_EXTR(etype) = 0;
2426 IC_RESULT(ic) = result = newiTempOperand(type,1);
2430 /* stack adjustment after call */
2431 left->parmBytes = stack;
2436 /*-----------------------------------------------------------------*/
2437 /* geniCodeReceive - generate intermediate code for "receive" */
2438 /*-----------------------------------------------------------------*/
2439 static void geniCodeReceive (value *args)
2441 /* for all arguments that are passed in registers */
2444 if (IS_REGPARM(args->etype)) {
2445 operand *opr = operandFromValue(args);
2447 symbol *sym = OP_SYMBOL(opr);
2450 /* we will use it after all optimizations
2451 and before liveRange calculation */
2452 if (!sym->addrtaken &&
2453 !IS_VOLATILE(sym->etype) &&
2454 !IN_FARSPACE(SPEC_OCLS(sym->etype))) {
2455 opl = newiTempOperand(args->type,0);
2457 sym->reqv->key = sym->key ;
2458 OP_SYMBOL(sym->reqv)->key = sym->key;
2459 OP_SYMBOL(sym->reqv)->isreqv = 1;
2460 OP_SYMBOL(sym->reqv)->islocal= 0;
2461 SPIL_LOC(sym->reqv) = sym;
2464 ic = newiCode(RECEIVE,NULL,NULL);
2465 currFunc->recvSize = getSize(sym->etype);
2466 IC_RESULT(ic) = opr;
2474 /*-----------------------------------------------------------------*/
2475 /* geniCodeFunctionBody - create the function body */
2476 /*-----------------------------------------------------------------*/
2477 void geniCodeFunctionBody (ast *tree)
2484 /* reset the auto generation */
2490 func = ast2iCode(tree->left);
2491 fetype = getSpec(operandType(func));
2493 savelineno = lineno;
2494 lineno = OP_SYMBOL(func)->lineDef;
2495 /* create an entry label */
2496 geniCodeLabel(entryLabel);
2497 lineno = savelineno;
2499 /* create a proc icode */
2500 ic = newiCode(FUNCTION,func,NULL);
2501 /* if the function has parmas then */
2502 /* save the parameters information */
2503 ic->argLabel.args = tree->values.args ;
2504 ic->lineno = OP_SYMBOL(func)->lineDef;
2508 /* for all parameters that are passed
2509 on registers add a "receive" */
2510 geniCodeReceive( tree->values.args );
2512 /* generate code for the body */
2513 ast2iCode(tree->right);
2515 /* create a label for return */
2516 geniCodeLabel(returnLabel);
2518 /* now generate the end proc */
2519 ic = newiCode(ENDFUNCTION,func,NULL);
2524 /*-----------------------------------------------------------------*/
2525 /* geniCodeReturn - gen icode for 'return' statement */
2526 /*-----------------------------------------------------------------*/
2527 void geniCodeReturn (operand *op)
2531 /* if the operand is present force an rvalue */
2533 op = geniCodeRValue(op,FALSE);
2535 ic = newiCode(RETURN,op,NULL);
2539 /*-----------------------------------------------------------------*/
2540 /* geniCodeIfx - generates code for extended if statement */
2541 /*-----------------------------------------------------------------*/
2542 void geniCodeIfx (ast *tree)
2545 operand *condition = ast2iCode(tree->left);
2548 /* if condition is null then exit */
2552 condition = geniCodeRValue(condition,FALSE);
2554 cetype = getSpec(operandType(condition));
2555 /* if the condition is a literal */
2556 if (IS_LITERAL(cetype)) {
2557 if (floatFromVal(condition->operand.valOperand)) {
2558 if (tree->trueLabel)
2559 geniCodeGoto(tree->trueLabel);
2564 if (tree->falseLabel)
2565 geniCodeGoto (tree->falseLabel);
2572 if ( tree->trueLabel ) {
2573 ic = newiCodeCondition(condition,
2578 if ( tree->falseLabel)
2579 geniCodeGoto(tree->falseLabel);
2582 ic = newiCodeCondition (condition,
2589 ast2iCode(tree->right);
2592 /*-----------------------------------------------------------------*/
2593 /* geniCodeJumpTable - tries to create a jump table for switch */
2594 /*-----------------------------------------------------------------*/
2595 int geniCodeJumpTable (operand *cond, value *caseVals, ast *tree)
2597 int min = 0 ,max = 0, t, cnt = 0;
2602 set *labels = NULL ;
2604 if (!tree || !caseVals)
2607 /* the criteria for creating a jump table is */
2608 /* all integer numbers between the maximum & minimum must */
2609 /* be present , the maximum value should not exceed 255 */
2610 min = max = (int)floatFromVal(vch = caseVals);
2611 sprintf(buffer,"_case_%d_%d",
2612 tree->values.switchVals.swNum,
2614 addSet(&labels,newiTempLabel(buffer));
2616 /* if there is only one case value then no need */
2617 if (!(vch = vch->next ))
2621 if (((t = (int)floatFromVal(vch)) - max) != 1)
2623 sprintf(buffer,"_case_%d_%d",
2624 tree->values.switchVals.swNum,
2626 addSet(&labels,newiTempLabel(buffer));
2632 /* if the number of case statements <= 2 then */
2633 /* it is not economical to create the jump table */
2634 /* since two compares are needed for boundary conditions */
2635 if ((! optimize.noJTabBoundary && cnt <= 2) || max > (255/3))
2638 if ( tree->values.switchVals.swDefault )
2639 sprintf (buffer,"_default_%d",tree->values.switchVals.swNum);
2641 sprintf (buffer,"_swBrk_%d",tree->values.switchVals.swNum );
2643 falseLabel = newiTempLabel (buffer);
2645 /* so we can create a jumptable */
2646 /* first we rule out the boundary conditions */
2647 /* if only optimization says so */
2648 if ( ! optimize.noJTabBoundary ) {
2649 link *cetype = getSpec(operandType(cond));
2650 /* no need to check the lower bound if
2651 the condition is unsigned & minimum value is zero */
2652 if (!( min == 0 && SPEC_USIGN(cetype))) {
2653 boundary = geniCodeLogic (cond,operandFromLit(min),'<');
2654 ic = newiCodeCondition (boundary,falseLabel,NULL);
2658 /* now for upper bounds */
2659 boundary = geniCodeLogic(cond,operandFromLit(max),'>');
2660 ic = newiCodeCondition (boundary,falseLabel,NULL);
2664 /* if the min is not zero then we no make it zero */
2666 cond = geniCodeSubtract(cond,operandFromLit(min));
2667 setOperandType(cond, UCHARTYPE);
2670 /* now create the jumptable */
2671 ic = newiCode(JUMPTABLE,NULL,NULL);
2672 IC_JTCOND(ic) = cond;
2673 IC_JTLABELS(ic) = labels;
2678 /*-----------------------------------------------------------------*/
2679 /* geniCodeSwitch - changes a switch to a if statement */
2680 /*-----------------------------------------------------------------*/
2681 void geniCodeSwitch (ast *tree)
2684 operand *cond = geniCodeRValue(ast2iCode (tree->left),FALSE);
2685 value *caseVals = tree->values.switchVals.swVals ;
2686 symbol *trueLabel , *falseLabel;
2688 /* if we can make this a jump table */
2689 if ( geniCodeJumpTable (cond,caseVals,tree) )
2690 goto jumpTable ; /* no need for the comparison */
2692 /* for the cases defined do */
2695 operand *compare = geniCodeLogic (cond,
2696 operandFromValue(caseVals),
2699 sprintf(buffer,"_case_%d_%d",
2700 tree->values.switchVals.swNum,
2701 (int) floatFromVal(caseVals));
2702 trueLabel = newiTempLabel(buffer);
2704 ic = newiCodeCondition(compare,trueLabel,NULL);
2706 caseVals = caseVals->next;
2711 /* if default is present then goto break else break */
2712 if ( tree->values.switchVals.swDefault )
2713 sprintf (buffer,"_default_%d",tree->values.switchVals.swNum);
2715 sprintf (buffer,"_swBrk_%d",tree->values.switchVals.swNum );
2717 falseLabel = newiTempLabel (buffer);
2718 geniCodeGoto(falseLabel);
2721 ast2iCode(tree->right);
2724 /*-----------------------------------------------------------------*/
2725 /* geniCodeInline - intermediate code for inline assembler */
2726 /*-----------------------------------------------------------------*/
2727 static void geniCodeInline (ast *tree)
2731 ic = newiCode(INLINEASM,NULL,NULL);
2732 IC_INLINE(ic) = tree->values.inlineasm;
2736 /*-----------------------------------------------------------------*/
2737 /* ast2iCode - creates an icodeList from an ast */
2738 /*-----------------------------------------------------------------*/
2739 operand *ast2iCode (ast *tree)
2741 operand *left = NULL;
2742 operand *right= NULL;
2747 /* set the global variables for filename & line number */
2748 if ( tree->filename )
2749 filename = tree->filename ;
2751 lineno = tree->lineno ;
2753 block = tree->block ;
2755 scopeLevel = tree->level;
2757 if (tree->type == EX_VALUE )
2758 return operandFromValue(tree->opval.val);
2760 if (tree->type == EX_LINK )
2761 return operandFromLink (tree->opval.lnk);
2763 /* if we find a nullop */
2764 if (tree->type == EX_OP &&
2765 ( tree->opval.op == NULLOP ||
2766 tree->opval.op == BLOCK )) {
2767 ast2iCode (tree->left);
2768 ast2iCode (tree->right);
2772 /* special cases for not evaluating */
2773 if ( tree->opval.op != ':' &&
2774 tree->opval.op != '?' &&
2775 tree->opval.op != CALL &&
2776 tree->opval.op != IFX &&
2777 tree->opval.op != LABEL &&
2778 tree->opval.op != GOTO &&
2779 tree->opval.op != SWITCH &&
2780 tree->opval.op != FUNCTION &&
2781 tree->opval.op != INLINEASM ) {
2782 if (IS_ASSIGN_OP(tree->opval.op) ||
2783 IS_DEREF_OP(tree) ||
2784 tree->opval.op == PTR_OP) {
2786 left = operandFromAst(tree->left);
2789 left = operandFromAst(tree->left);
2791 if (tree->opval.op == INC_OP || tree->opval.op == DEC_OP) {
2793 right= operandFromAst(tree->right);
2796 right= operandFromAst(tree->right);
2800 /* now depending on the type of operand */
2801 /* this will be a biggy */
2802 switch (tree->opval.op) {
2804 case '[' : /* array operation */
2805 left= geniCodeRValue (left,FALSE);
2806 right=geniCodeRValue (right,TRUE);
2808 return geniCodeArray (left,right);
2810 case '.' : /* structure dereference */
2811 if (IS_PTR(operandType(left)))
2812 left = geniCodeRValue(left,TRUE);
2814 left = geniCodeRValue(left,FALSE);
2816 return geniCodeStruct (left,right,tree->lvalue);
2818 case PTR_OP: /* structure pointer dereference */
2821 pType = operandType(left);
2822 left = geniCodeRValue(left,TRUE);
2824 setOClass (pType,getSpec(operandType(left)));
2827 return geniCodeStruct (left, right,tree->lvalue);
2829 case INC_OP: /* increment operator */
2831 return geniCodePostInc (left);
2833 return geniCodePreInc (right);
2835 case DEC_OP: /* decrement operator */
2837 return geniCodePostDec (left);
2839 return geniCodePreDec (right);
2841 case '&' : /* bitwise and or address of operator */
2842 if ( right ) { /* this is a bitwise operator */
2843 left= geniCodeRValue(left,FALSE);
2844 right= geniCodeRValue(right,FALSE);
2845 return geniCodeBitwise (left,right,BITWISEAND,tree->ftype);
2847 return geniCodeAddressOf (left);
2849 case '|': /* bitwise or & xor */
2851 return geniCodeBitwise (geniCodeRValue(left,FALSE),
2852 geniCodeRValue(right,FALSE),
2857 return geniCodeDivision (geniCodeRValue(left,FALSE),
2858 geniCodeRValue(right,FALSE));
2861 return geniCodeModulus (geniCodeRValue(left,FALSE),
2862 geniCodeRValue(right,FALSE));
2865 return geniCodeMultiply (geniCodeRValue(left,FALSE),
2866 geniCodeRValue(right,FALSE));
2868 return geniCodeDerefPtr (geniCodeRValue(left,FALSE));
2872 return geniCodeSubtract (geniCodeRValue(left,FALSE),
2873 geniCodeRValue(right,FALSE));
2875 return geniCodeUnaryMinus (geniCodeRValue(left,FALSE));
2879 return geniCodeAdd (geniCodeRValue(left,FALSE),
2880 geniCodeRValue(right,FALSE));
2882 return geniCodeRValue(left,FALSE) ; /* unary '+' has no meaning */
2885 return geniCodeLeftShift (geniCodeRValue(left,FALSE),
2886 geniCodeRValue(right,FALSE));
2889 return geniCodeRightShift (geniCodeRValue(left,FALSE),
2890 geniCodeRValue(right,FALSE));
2892 return geniCodeCast (operandType(left),
2893 geniCodeRValue(right,FALSE),FALSE);
2899 return geniCodeUnary (geniCodeRValue(left,FALSE),tree->opval.op);
2903 operand *op = geniCodeUnary (geniCodeRValue(left,FALSE),tree->opval.op);
2904 setOperandType(op, UCHARTYPE);
2915 return geniCodeLogic (geniCodeRValue(left,FALSE),
2916 geniCodeRValue(right,FALSE),
2919 return geniCodeConditional (tree);
2922 return operandFromLit(getSize(tree->right->ftype));
2926 link *rtype = operandType(right);
2927 link *ltype = operandType(left);
2928 if (IS_PTR(rtype) && IS_ITEMP(right)
2929 && right->isaddr && checkType(rtype->next,ltype)==1)
2930 right = geniCodeRValue(right,TRUE);
2932 right = geniCodeRValue(right,FALSE);
2934 geniCodeAssign (left,right,0);
2939 geniCodeAssign(left,
2940 geniCodeMultiply(geniCodeRValue (operandFromOperand(left),
2942 geniCodeRValue(right,FALSE)),0);
2946 geniCodeAssign(left,
2947 geniCodeDivision(geniCodeRValue(operandFromOperand(left),
2949 geniCodeRValue(right,FALSE)),0);
2952 geniCodeAssign(left,
2953 geniCodeModulus(geniCodeRValue(operandFromOperand(left),
2955 geniCodeRValue(right,FALSE)),0);
2958 link *rtype = operandType(right);
2959 link *ltype = operandType(left);
2960 if (IS_PTR(rtype) && IS_ITEMP(right)
2961 && right->isaddr && checkType(rtype->next,ltype)==1)
2962 right = geniCodeRValue(right,TRUE);
2964 right = geniCodeRValue(right,FALSE);
2967 return geniCodeAssign(left,
2968 geniCodeAdd (geniCodeRValue(operandFromOperand(left),
2974 link *rtype = operandType(right);
2975 link *ltype = operandType(left);
2976 if (IS_PTR(rtype) && IS_ITEMP(right)
2977 && right->isaddr && checkType(rtype->next,ltype)==1) {
2978 right = geniCodeRValue(right,TRUE);
2981 right = geniCodeRValue(right,FALSE);
2984 geniCodeAssign (left,
2985 geniCodeSubtract(geniCodeRValue(operandFromOperand(left),
2991 geniCodeAssign (left,
2992 geniCodeLeftShift(geniCodeRValue(operandFromOperand(left)
2994 geniCodeRValue(right,FALSE)),0);
2997 geniCodeAssign(left,
2998 geniCodeRightShift(geniCodeRValue(operandFromOperand(left)
3000 geniCodeRValue(right,FALSE)),0);
3003 geniCodeAssign (left,
3004 geniCodeBitwise(geniCodeRValue(operandFromOperand(left),
3006 geniCodeRValue(right,FALSE),
3008 operandType(left)),0);
3011 geniCodeAssign (left,
3012 geniCodeBitwise (geniCodeRValue(operandFromOperand(left),
3014 geniCodeRValue(right,FALSE),
3016 operandType(left)),0);
3019 geniCodeAssign (left,
3020 geniCodeBitwise (geniCodeRValue(operandFromOperand(left)
3022 geniCodeRValue(right,FALSE),
3024 operandType(left)),0);
3026 return geniCodeRValue(right,FALSE);
3029 return geniCodeCall (ast2iCode(tree->left),
3032 geniCodeLabel(ast2iCode(tree->left)->operand.symOperand);
3033 return ast2iCode (tree->right);
3036 geniCodeGoto (ast2iCode(tree->left)->operand.symOperand);
3037 return ast2iCode (tree->right);
3040 geniCodeFunctionBody ( tree );
3044 geniCodeReturn (right);
3052 geniCodeSwitch (tree);
3056 geniCodeInline (tree);
3063 /*-----------------------------------------------------------------*/
3064 /* reverseICChain - gets from the list and creates a linkedlist */
3065 /*-----------------------------------------------------------------*/
3066 iCode *reverseiCChain ()
3068 iCode *loop = NULL ;
3069 iCode *prev = NULL ;
3071 while ((loop = getSet(&iCodeChain))) {
3082 /*-----------------------------------------------------------------*/
3083 /* iCodeFromAst - given an ast will convert it to iCode */
3084 /*-----------------------------------------------------------------*/
3085 iCode *iCodeFromAst ( ast *tree )
3087 returnLabel = newiTempLabel("_return");
3088 entryLabel = newiTempLabel("_entry") ;
3090 return reverseiCChain ();