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 ;
652 werror (E_INTERNAL_ERROR,__FILE__,__LINE__,
653 " operand type not known ");
654 assert (0) ; /* should never come here */
655 /* 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) && op->type == VALUE && !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 the variable was declared a constant */
1654 /* then the pointer points to a constant */
1655 if (IS_CONSTANT(etype) )
1656 DCL_PTR_CONST(ptype) = 1;
1658 /* the variable was volatile then pointer to volatile */
1659 if (IS_VOLATILE(etype))
1660 DCL_PTR_VOLATILE(ptype) = 1;
1664 /*-----------------------------------------------------------------*/
1665 /* geniCodeArray2Ptr - array to pointer */
1666 /*-----------------------------------------------------------------*/
1667 operand *geniCodeArray2Ptr (operand *op)
1669 link *optype = operandType(op);
1670 link *opetype = getSpec(optype);
1672 /* set the pointer depending on the storage class */
1673 if ((DCL_TYPE(optype) = PTR_TYPE(SPEC_OCLS(opetype))) == CPOINTER)
1674 DCL_PTR_CONST(optype) = 1;
1677 /* if the variable was declared a constant */
1678 /* then the pointer points to a constant */
1679 if (IS_CONSTANT(opetype) )
1680 DCL_PTR_CONST(optype) = 1;
1682 /* the variable was volatile then pointer to volatile */
1683 if (IS_VOLATILE(opetype))
1684 DCL_PTR_VOLATILE(optype) = 1;
1689 /*-----------------------------------------------------------------*/
1690 /* geniCodeArray - array access */
1691 /*-----------------------------------------------------------------*/
1692 operand *geniCodeArray (operand *left,operand *right)
1695 link *ltype = operandType(left);
1697 if (IS_PTR(ltype)) {
1698 if (IS_PTR(ltype->next) && left->isaddr)
1699 left = geniCodeRValue(left,FALSE);
1700 return geniCodeDerefPtr(geniCodeAdd(left,right));
1704 right = geniCodeMultiply(right,
1705 operandFromLit(getSize(ltype->next)));
1707 /* we can check for limits here */
1708 if (isOperandLiteral(right) &&
1711 (operandLitValue(right)/getSize(ltype->next)) >= DCL_ELEM(ltype)) {
1712 werror(E_ARRAY_BOUND);
1713 right = operandFromLit(0);
1716 ic = newiCode('+',left,right);
1718 IC_RESULT(ic) = newiTempOperand(((IS_PTR(ltype) &&
1719 !IS_AGGREGATE(ltype->next) &&
1720 !IS_PTR(ltype->next))
1721 ? ltype : ltype->next),0);
1723 IC_RESULT(ic)->isaddr = (!IS_AGGREGATE(ltype->next));
1725 return IC_RESULT(ic) ;
1728 /*-----------------------------------------------------------------*/
1729 /* geniCodeStruct - generates intermediate code for structres */
1730 /*-----------------------------------------------------------------*/
1731 operand *geniCodeStruct (operand *left, operand *right, bool islval)
1734 link *type = operandType(left);
1735 link *etype = getSpec(type);
1737 symbol *element = getStructElement(SPEC_STRUCT(etype),
1738 right->operand.symOperand);
1740 /* add the offset */
1741 ic = newiCode('+',left,operandFromLit(element->offset));
1743 IC_RESULT(ic) = newiTempOperand(element->type,0);
1745 /* preserve the storage & output class of the struct */
1746 /* as well as the volatile attribute */
1747 retype = getSpec(operandType(IC_RESULT(ic)));
1748 SPEC_SCLS(retype) = SPEC_SCLS(etype);
1749 SPEC_OCLS(retype) = SPEC_OCLS(etype);
1750 SPEC_VOLATILE(retype) |= SPEC_VOLATILE(etype);
1752 if (IS_PTR(element->type))
1753 setOperandType(IC_RESULT(ic),aggrToPtr(operandType(IC_RESULT(ic)),TRUE));
1755 IC_RESULT(ic)->isaddr = (!IS_AGGREGATE(element->type));
1759 return (islval ? IC_RESULT(ic) : geniCodeRValue(IC_RESULT(ic),TRUE));
1762 /*-----------------------------------------------------------------*/
1763 /* geniCodePostInc - generate int code for Post increment */
1764 /*-----------------------------------------------------------------*/
1765 operand *geniCodePostInc (operand *op)
1769 link *optype = operandType(op);
1771 operand *rv = (IS_ITEMP(op) ?
1772 geniCodeRValue(op,(IS_PTR(optype) ? TRUE : FALSE)) :
1774 link *rvtype = operandType(rv);
1777 /* if this is not an address we have trouble */
1778 if ( ! op->isaddr ) {
1779 werror (E_LVALUE_REQUIRED,"++");
1783 rOp = newiTempOperand(rvtype,0);
1789 geniCodeAssign(rOp,rv,0);
1791 size = (IS_PTR(rvtype) ? getSize(rvtype->next) : 1);
1792 ic = newiCode('+',rv,operandFromLit(size));
1793 IC_RESULT(ic) = result =newiTempOperand(rvtype,0);
1796 geniCodeAssign(op,result,0);
1802 /*-----------------------------------------------------------------*/
1803 /* geniCodePreInc - generate code for preIncrement */
1804 /*-----------------------------------------------------------------*/
1805 operand *geniCodePreInc (operand *op)
1808 link *optype = operandType(op);
1809 operand *rop = (IS_ITEMP(op) ?
1810 geniCodeRValue (op,(IS_PTR(optype) ? TRUE : FALSE)) :
1812 link *roptype = operandType(rop);
1816 if ( ! op->isaddr ) {
1817 werror(E_LVALUE_REQUIRED,"++");
1822 size = (IS_PTR(roptype) ? getSize(roptype->next) : 1);
1823 ic = newiCode('+',rop,operandFromLit(size));
1824 IC_RESULT(ic) = result = newiTempOperand(roptype,0) ;
1828 return geniCodeAssign(op,result,0) ;
1831 /*-----------------------------------------------------------------*/
1832 /* geniCodePostDec - generates code for Post decrement */
1833 /*-----------------------------------------------------------------*/
1834 operand *geniCodePostDec (operand *op)
1838 link *optype = operandType(op);
1840 operand *rv = (IS_ITEMP(op) ?
1841 geniCodeRValue(op,(IS_PTR(optype) ? TRUE : FALSE)) :
1843 link *rvtype = operandType(rv);
1846 /* if this is not an address we have trouble */
1847 if ( ! op->isaddr ) {
1848 werror (E_LVALUE_REQUIRED,"++");
1852 rOp = newiTempOperand(rvtype,0);
1858 geniCodeAssign(rOp,rv,0);
1860 size = (IS_PTR(rvtype) ? getSize(rvtype->next) : 1);
1861 ic = newiCode('-',rv,operandFromLit(size));
1862 IC_RESULT(ic) = result =newiTempOperand(rvtype,0);
1865 geniCodeAssign(op,result,0);
1871 /*-----------------------------------------------------------------*/
1872 /* geniCodePreDec - generate code for pre decrement */
1873 /*-----------------------------------------------------------------*/
1874 operand *geniCodePreDec (operand *op)
1877 link *optype = operandType(op);
1878 operand *rop = (IS_ITEMP(op) ?
1879 geniCodeRValue (op,(IS_PTR(optype) ? TRUE : FALSE)) :
1881 link *roptype = operandType(rop);
1885 if ( ! op->isaddr ) {
1886 werror(E_LVALUE_REQUIRED,"++");
1891 size = (IS_PTR(roptype) ? getSize(roptype->next) : 1);
1892 ic = newiCode('-',rop,operandFromLit(size));
1893 IC_RESULT(ic) = result = newiTempOperand(roptype,0) ;
1897 return geniCodeAssign(op,result,0) ;
1901 /*-----------------------------------------------------------------*/
1902 /* geniCodeBitwise - gen int code for bitWise operators */
1903 /*-----------------------------------------------------------------*/
1904 operand *geniCodeBitwise (operand *left, operand *right,
1905 int oper, link *resType)
1909 left = geniCodeCast(resType,left,TRUE);
1910 right= geniCodeCast(resType,right,TRUE);
1912 ic = newiCode(oper,left,right);
1913 IC_RESULT(ic) = newiTempOperand(resType,0);
1916 return IC_RESULT(ic) ;
1919 /*-----------------------------------------------------------------*/
1920 /* geniCodeAddressOf - gens icode for '&' address of operator */
1921 /*-----------------------------------------------------------------*/
1922 operand *geniCodeAddressOf (operand *op)
1926 link *optype = operandType(op);
1927 link *opetype= getSpec(optype);
1929 /* lvalue check already done in decorateType */
1930 /* this must be a lvalue */
1931 /* if (!op->isaddr && !IS_AGGREGATE(optype)) { */
1932 /* werror (E_LVALUE_REQUIRED,"&"); */
1937 p->class = DECLARATOR ;
1939 /* set the pointer depending on the storage class */
1940 if ((DCL_TYPE(p) = PTR_TYPE(SPEC_OCLS(opetype))) == CPOINTER)
1941 DCL_PTR_CONST(p) = 1;
1943 /* make sure we preserve the const & volatile */
1944 if (IS_CONSTANT(opetype))
1945 DCL_PTR_CONST(p) = 1;
1947 if (IS_VOLATILE(opetype))
1948 DCL_PTR_VOLATILE(p) = 1;
1950 p->next = copyLinkChain(optype);
1952 /* if already a temp */
1954 setOperandType (op,p);
1959 /* other wise make this of the type coming in */
1960 ic = newiCode(ADDRESS_OF,op,NULL);
1961 IC_RESULT(ic) = newiTempOperand(p,1);
1962 IC_RESULT(ic)->isaddr = 0;
1964 return IC_RESULT(ic);
1966 /*-----------------------------------------------------------------*/
1967 /* setOClass - sets the output class depending on the pointer type */
1968 /*-----------------------------------------------------------------*/
1969 void setOClass (link *ptr, link *spec)
1971 switch (DCL_TYPE(ptr)) {
1973 SPEC_OCLS(spec) = data ;
1977 SPEC_OCLS(spec) = generic;
1981 SPEC_OCLS(spec) = xdata ;
1985 SPEC_OCLS(spec) = code ;
1989 SPEC_OCLS(spec) = idata;
1993 SPEC_OCLS(spec) = xstack;
1997 SPEC_OCLS(spec) = eeprom;
2006 /*-----------------------------------------------------------------*/
2007 /* geniCodeDerefPtr - dereference pointer with '*' */
2008 /*-----------------------------------------------------------------*/
2009 operand *geniCodeDerefPtr (operand *op)
2011 link *rtype , *retype ;
2012 link *optype = operandType(op);
2014 /* if this is a pointer then generate the rvalue */
2015 if (IS_PTR(optype)) {
2016 if (IS_TRUE_SYMOP(op)) {
2018 op = geniCodeRValue(op,TRUE);
2021 op = geniCodeRValue(op,TRUE);
2024 /* now get rid of the pointer part */
2025 if (lvaluereq && IS_ITEMP(op) )
2027 retype = getSpec(rtype = copyLinkChain(optype)) ;
2031 retype = getSpec(rtype = copyLinkChain(optype->next)) ;
2034 /* if this is a pointer then outputclass needs 2b updated */
2036 setOClass(optype,retype);
2038 op->isGptr = IS_GENPTR(optype);
2040 /* if the pointer was declared as a constant */
2041 /* then we cannot allow assignment to the derefed */
2042 if (IS_PTR_CONST(optype))
2043 SPEC_CONST(retype) = 1;
2045 op->isaddr = (IS_PTR(rtype) ||
2052 op = geniCodeRValue(op,TRUE);
2054 setOperandType(op,rtype);
2059 /*-----------------------------------------------------------------*/
2060 /* geniCodeUnaryMinus - does a unary minus of the operand */
2061 /*-----------------------------------------------------------------*/
2062 operand *geniCodeUnaryMinus (operand *op)
2065 link *optype = operandType(op);
2067 if (IS_LITERAL(optype))
2068 return operandFromLit(- floatFromVal(op->operand.valOperand));
2070 ic = newiCode(UNARYMINUS,op,NULL);
2071 IC_RESULT(ic) = newiTempOperand(optype,0);
2073 return IC_RESULT(ic);
2076 /*-----------------------------------------------------------------*/
2077 /* geniCodeLeftShift - gen i code for left shift */
2078 /*-----------------------------------------------------------------*/
2079 operand *geniCodeLeftShift (operand *left, operand *right)
2082 link *ltype = operandType(left);
2084 ic = newiCode(LEFT_OP,left,right);
2085 IC_RESULT(ic) = newiTempOperand(ltype,0);
2087 return IC_RESULT(ic) ;
2090 /*-----------------------------------------------------------------*/
2091 /* geniCodeRightShift - gen i code for right shift */
2092 /*-----------------------------------------------------------------*/
2093 operand *geniCodeRightShift (operand *left, operand *right)
2096 link *ltype = operandType(left);
2098 ic = newiCode(RIGHT_OP,left,right);
2099 IC_RESULT(ic) = newiTempOperand(ltype,0);
2101 return IC_RESULT(ic) ;
2105 #define LONG_LONG __int64
2107 #define LONG_LONG long long
2110 /*-----------------------------------------------------------------*/
2111 /* geniCodeLogic- logic code */
2112 /*-----------------------------------------------------------------*/
2113 operand *geniCodeLogic (operand *left, operand *right, int op )
2117 link *rtype = operandType(right);
2118 link *ltype = operandType(left);
2120 /* left is integral type and right is literal then
2121 check if the literal value is within bounds */
2122 if (IS_INTEGRAL(ltype) && IS_LITERAL(rtype)) {
2123 int nbits = bitsForType(ltype);
2124 long v = operandLitValue(right);
2126 if (v > ((LONG_LONG) 1 << nbits) && v > 0)
2127 werror(W_CONST_RANGE," compare operation ");
2130 ctype = computeType(ltype,rtype);
2131 left = geniCodeCast(ctype,left,TRUE);
2132 right= geniCodeCast(ctype,right,TRUE);
2134 ic = newiCode(op,left,right);
2135 IC_RESULT(ic) = newiTempOperand (newCharLink(),1);
2137 /* if comparing anything greater than one byte
2138 and not a '==' || '!=' || '&&' || '||' (these
2140 if (getSize(ctype) > 1 &&
2148 return IC_RESULT(ic);
2151 /*-----------------------------------------------------------------*/
2152 /* geniCodeUnary - for a a generic unary operation */
2153 /*-----------------------------------------------------------------*/
2154 operand *geniCodeUnary (operand *op, int oper )
2156 iCode *ic = newiCode (oper,op,NULL);
2158 IC_RESULT(ic)= newiTempOperand(operandType(op),0);
2160 return IC_RESULT(ic) ;
2163 /*-----------------------------------------------------------------*/
2164 /* geniCodeConditional - geniCode for '?' ':' operation */
2165 /*-----------------------------------------------------------------*/
2166 operand *geniCodeConditional (ast *tree)
2169 symbol *falseLabel = newiTempLabel(NULL);
2170 symbol *exitLabel = newiTempLabel(NULL);
2171 operand *cond = ast2iCode(tree->left);
2172 operand *true, *false , *result;
2174 ic = newiCodeCondition(geniCodeRValue(cond,FALSE),
2178 true = ast2iCode(tree->right->left);
2180 /* move the value to a new Operand */
2181 result = newiTempOperand(operandType(true),0);
2182 geniCodeAssign(result,geniCodeRValue(true,FALSE),0);
2184 /* generate an unconditional goto */
2185 geniCodeGoto(exitLabel);
2187 /* now for the right side */
2188 geniCodeLabel(falseLabel);
2190 false = ast2iCode(tree->right->right);
2191 geniCodeAssign(result,geniCodeRValue(false,FALSE),0);
2193 /* create the exit label */
2194 geniCodeLabel(exitLabel);
2199 /*-----------------------------------------------------------------*/
2200 /* geniCodeAssign - generate code for assignment */
2201 /*-----------------------------------------------------------------*/
2202 operand *geniCodeAssign (operand *left, operand *right, int nosupdate)
2205 link *ltype = operandType(left);
2206 link *rtype = operandType(right);
2208 if (!left->isaddr && !IS_ITEMP(left)) {
2209 werror(E_LVALUE_REQUIRED,"assignment");
2213 /* left is integral type and right is literal then
2214 check if the literal value is within bounds */
2215 if (IS_INTEGRAL(ltype) && right->type == VALUE && IS_LITERAL(rtype)) {
2216 int nbits = bitsForType(ltype);
2217 long v = operandLitValue(right);
2219 if (v > ((LONG_LONG)1 << nbits) && v > 0)
2220 werror(W_CONST_RANGE," = operation");
2223 /* if the left & right type don't exactly match */
2224 /* if pointer set then make sure the check is
2225 done with the type & not the pointer */
2226 /* then cast rights type to left */
2228 /* first check the type for pointer assignement */
2229 if (left->isaddr && IS_PTR(ltype) && IS_ITEMP(left) &&
2230 checkType(ltype,rtype)<0) {
2231 if (checkType(ltype->next,rtype) < 0)
2232 right = geniCodeCast(ltype->next,right,TRUE);
2234 if (checkType(ltype,rtype) < 0 )
2235 right = geniCodeCast(ltype,right,TRUE);
2237 /* if left is a true symbol & ! volatile
2238 create an assignment to temporary for
2239 the right & then assign this temporary
2240 to the symbol this is SSA . isn't it simple
2241 and folks have published mountains of paper on it */
2242 if (IS_TRUE_SYMOP(left) &&
2243 !isOperandVolatile(left,FALSE) &&
2244 isOperandGlobal(left)) {
2247 if (IS_TRUE_SYMOP(right))
2248 sym = OP_SYMBOL(right);
2249 ic = newiCode('=',NULL,right);
2250 IC_RESULT(ic) = right = newiTempOperand(ltype,0);
2251 SPIL_LOC(right) = sym ;
2255 ic = newiCode('=',NULL,right);
2256 IC_RESULT(ic) = left;
2259 /* if left isgptr flag is set then support
2260 routine will be required */
2264 ic->nosupdate = nosupdate;
2268 /*-----------------------------------------------------------------*/
2269 /* geniCodeSEParms - generate code for side effecting fcalls */
2270 /*-----------------------------------------------------------------*/
2271 static void geniCodeSEParms (ast *parms)
2276 if (parms->type == EX_OP && parms->opval.op == PARAM) {
2277 geniCodeSEParms (parms->left) ;
2278 geniCodeSEParms (parms->right);
2282 /* hack don't like this but too lazy to think of
2284 if (IS_ADDRESS_OF_OP(parms))
2285 parms->left->lvalue = 1;
2287 if (IS_CAST_OP(parms) &&
2288 IS_PTR(parms->ftype) &&
2289 IS_ADDRESS_OF_OP(parms->right))
2290 parms->right->left->lvalue = 1;
2292 parms->opval.oprnd =
2293 geniCodeRValue(ast2iCode (parms),FALSE);
2295 parms->type = EX_OPERAND ;
2298 /*-----------------------------------------------------------------*/
2299 /* geniCodeParms - generates parameters */
2300 /*-----------------------------------------------------------------*/
2301 static void geniCodeParms ( ast *parms , int *stack, link *fetype)
2309 /* if this is a param node then do the left & right */
2310 if (parms->type == EX_OP && parms->opval.op == PARAM) {
2311 geniCodeParms (parms->left, stack,fetype) ;
2312 geniCodeParms (parms->right, stack,fetype);
2316 /* get the parameter value */
2317 if (parms->type == EX_OPERAND)
2318 pval = parms->opval.oprnd ;
2320 /* maybe this else should go away ?? */
2321 /* hack don't like this but too lazy to think of
2323 if (IS_ADDRESS_OF_OP(parms))
2324 parms->left->lvalue = 1;
2326 if (IS_CAST_OP(parms) &&
2327 IS_PTR(parms->ftype) &&
2328 IS_ADDRESS_OF_OP(parms->right))
2329 parms->right->left->lvalue = 1;
2331 pval = geniCodeRValue(ast2iCode (parms),FALSE);
2334 /* if register parm then make it a send */
2335 if ((parms->argSym && IS_REGPARM(parms->argSym->etype)) ||
2336 IS_REGPARM(parms->etype)) {
2337 ic = newiCode(SEND,pval,NULL);
2340 /* now decide whether to push or assign */
2341 if (!(options.stackAuto || IS_RENT(fetype))) {
2344 operand *top = operandFromSymbol(parms->argSym);
2345 geniCodeAssign(top,pval,1);
2348 link *p = operandType(pval);
2350 ic = newiCode(IPUSH,pval,NULL);
2352 /* update the stack adjustment */
2353 *stack += getSize(IS_AGGREGATE(p)? aggrToPtr(p,FALSE):p);
2360 /*-----------------------------------------------------------------*/
2361 /* geniCodeCall - generates temp code for calling */
2362 /*-----------------------------------------------------------------*/
2363 operand *geniCodeCall (operand *left, ast *parms)
2370 /* take care of parameters with side-effecting
2371 function calls in them, this is required to take care
2372 of overlaying function parameters */
2373 geniCodeSEParms ( parms );
2375 /* first the parameters */
2376 geniCodeParms ( parms , &stack , getSpec(operandType(left)));
2378 /* now call : if symbol then pcall */
2380 ic = newiCode(PCALL,left,NULL);
2382 ic = newiCode(CALL,left,NULL);
2384 IC_ARGS(ic) = left->operand.symOperand->args ;
2385 type = copyLinkChain(operandType(left)->next);
2386 etype = getSpec(type);
2387 SPEC_EXTR(etype) = 0;
2388 IC_RESULT(ic) = result = newiTempOperand(type,1);
2392 /* stack adjustment after call */
2393 left->parmBytes = stack;
2398 /*-----------------------------------------------------------------*/
2399 /* geniCodeReceive - generate intermediate code for "receive" */
2400 /*-----------------------------------------------------------------*/
2401 static void geniCodeReceive (value *args)
2403 /* for all arguments that are passed in registers */
2406 if (IS_REGPARM(args->etype)) {
2407 operand *opr = operandFromValue(args);
2409 symbol *sym = OP_SYMBOL(opr);
2412 /* we will use it after all optimizations
2413 and before liveRange calculation */
2414 if (!sym->addrtaken &&
2415 !IS_VOLATILE(sym->etype) &&
2416 !IN_FARSPACE(SPEC_OCLS(sym->etype))) {
2417 opl = newiTempOperand(args->type,0);
2419 sym->reqv->key = sym->key ;
2420 OP_SYMBOL(sym->reqv)->key = sym->key;
2421 OP_SYMBOL(sym->reqv)->isreqv = 1;
2422 OP_SYMBOL(sym->reqv)->islocal= 0;
2423 SPIL_LOC(sym->reqv) = sym;
2426 ic = newiCode(RECEIVE,NULL,NULL);
2427 currFunc->recvSize = getSize(sym->etype);
2428 IC_RESULT(ic) = opr;
2436 /*-----------------------------------------------------------------*/
2437 /* geniCodeFunctionBody - create the function body */
2438 /*-----------------------------------------------------------------*/
2439 void geniCodeFunctionBody (ast *tree)
2446 /* reset the auto generation */
2452 func = ast2iCode(tree->left);
2453 fetype = getSpec(operandType(func));
2455 savelineno = lineno;
2456 lineno = OP_SYMBOL(func)->lineDef;
2457 /* create an entry label */
2458 geniCodeLabel(entryLabel);
2459 lineno = savelineno;
2461 /* create a proc icode */
2462 ic = newiCode(FUNCTION,func,NULL);
2463 /* if the function has parmas then */
2464 /* save the parameters information */
2465 ic->argLabel.args = tree->values.args ;
2466 ic->lineno = OP_SYMBOL(func)->lineDef;
2470 /* for all parameters that are passed
2471 on registers add a "receive" */
2472 geniCodeReceive( tree->values.args );
2474 /* generate code for the body */
2475 ast2iCode(tree->right);
2477 /* create a label for return */
2478 geniCodeLabel(returnLabel);
2480 /* now generate the end proc */
2481 ic = newiCode(ENDFUNCTION,func,NULL);
2486 /*-----------------------------------------------------------------*/
2487 /* geniCodeReturn - gen icode for 'return' statement */
2488 /*-----------------------------------------------------------------*/
2489 void geniCodeReturn (operand *op)
2493 /* if the operand is present force an rvalue */
2495 op = geniCodeRValue(op,FALSE);
2497 ic = newiCode(RETURN,op,NULL);
2501 /*-----------------------------------------------------------------*/
2502 /* geniCodeIfx - generates code for extended if statement */
2503 /*-----------------------------------------------------------------*/
2504 void geniCodeIfx (ast *tree)
2507 operand *condition = ast2iCode(tree->left);
2510 /* if condition is null then exit */
2514 condition = geniCodeRValue(condition,FALSE);
2516 cetype = getSpec(operandType(condition));
2517 /* if the condition is a literal */
2518 if (IS_LITERAL(cetype)) {
2519 if (floatFromVal(condition->operand.valOperand)) {
2520 if (tree->trueLabel)
2521 geniCodeGoto(tree->trueLabel);
2526 if (tree->falseLabel)
2527 geniCodeGoto (tree->falseLabel);
2534 if ( tree->trueLabel ) {
2535 ic = newiCodeCondition(condition,
2540 if ( tree->falseLabel)
2541 geniCodeGoto(tree->falseLabel);
2544 ic = newiCodeCondition (condition,
2551 ast2iCode(tree->right);
2554 /*-----------------------------------------------------------------*/
2555 /* geniCodeJumpTable - tries to create a jump table for switch */
2556 /*-----------------------------------------------------------------*/
2557 int geniCodeJumpTable (operand *cond, value *caseVals, ast *tree)
2559 int min = 0 ,max = 0, t, cnt = 0;
2564 set *labels = NULL ;
2566 if (!tree || !caseVals)
2569 /* the criteria for creating a jump table is */
2570 /* all integer numbers between the maximum & minimum must */
2571 /* be present , the maximum value should not exceed 255 */
2572 min = max = (int)floatFromVal(vch = caseVals);
2573 sprintf(buffer,"_case_%d_%d",
2574 tree->values.switchVals.swNum,
2576 addSet(&labels,newiTempLabel(buffer));
2578 /* if there is only one case value then no need */
2579 if (!(vch = vch->next ))
2583 if (((t = (int)floatFromVal(vch)) - max) != 1)
2585 sprintf(buffer,"_case_%d_%d",
2586 tree->values.switchVals.swNum,
2588 addSet(&labels,newiTempLabel(buffer));
2594 /* if the number of case statements <= 2 then */
2595 /* it is not economical to create the jump table */
2596 /* since two compares are needed for boundary conditions */
2597 if ((! optimize.noJTabBoundary && cnt <= 2) || max > (255/3))
2600 if ( tree->values.switchVals.swDefault )
2601 sprintf (buffer,"_default_%d",tree->values.switchVals.swNum);
2603 sprintf (buffer,"_swBrk_%d",tree->values.switchVals.swNum );
2605 falseLabel = newiTempLabel (buffer);
2607 /* so we can create a jumptable */
2608 /* first we rule out the boundary conditions */
2609 /* if only optimization says so */
2610 if ( ! optimize.noJTabBoundary ) {
2611 link *cetype = getSpec(operandType(cond));
2612 /* no need to check the lower bound if
2613 the condition is unsigned & minimum value is zero */
2614 if (!( min == 0 && SPEC_USIGN(cetype))) {
2615 boundary = geniCodeLogic (cond,operandFromLit(min),'<');
2616 ic = newiCodeCondition (boundary,falseLabel,NULL);
2620 /* now for upper bounds */
2621 boundary = geniCodeLogic(cond,operandFromLit(max),'>');
2622 ic = newiCodeCondition (boundary,falseLabel,NULL);
2626 /* if the min is not zero then we no make it zero */
2628 cond = geniCodeSubtract(cond,operandFromLit(min));
2629 setOperandType(cond, UCHARTYPE);
2632 /* now create the jumptable */
2633 ic = newiCode(JUMPTABLE,NULL,NULL);
2634 IC_JTCOND(ic) = cond;
2635 IC_JTLABELS(ic) = labels;
2640 /*-----------------------------------------------------------------*/
2641 /* geniCodeSwitch - changes a switch to a if statement */
2642 /*-----------------------------------------------------------------*/
2643 void geniCodeSwitch (ast *tree)
2646 operand *cond = geniCodeRValue(ast2iCode (tree->left),FALSE);
2647 value *caseVals = tree->values.switchVals.swVals ;
2648 symbol *trueLabel , *falseLabel;
2650 /* if we can make this a jump table */
2651 if ( geniCodeJumpTable (cond,caseVals,tree) )
2652 goto jumpTable ; /* no need for the comparison */
2654 /* for the cases defined do */
2657 operand *compare = geniCodeLogic (cond,
2658 operandFromValue(caseVals),
2661 sprintf(buffer,"_case_%d_%d",
2662 tree->values.switchVals.swNum,
2663 (int) floatFromVal(caseVals));
2664 trueLabel = newiTempLabel(buffer);
2666 ic = newiCodeCondition(compare,trueLabel,NULL);
2668 caseVals = caseVals->next;
2673 /* if default is present then goto break else break */
2674 if ( tree->values.switchVals.swDefault )
2675 sprintf (buffer,"_default_%d",tree->values.switchVals.swNum);
2677 sprintf (buffer,"_swBrk_%d",tree->values.switchVals.swNum );
2679 falseLabel = newiTempLabel (buffer);
2680 geniCodeGoto(falseLabel);
2683 ast2iCode(tree->right);
2686 /*-----------------------------------------------------------------*/
2687 /* geniCodeInline - intermediate code for inline assembler */
2688 /*-----------------------------------------------------------------*/
2689 static void geniCodeInline (ast *tree)
2693 ic = newiCode(INLINEASM,NULL,NULL);
2694 IC_INLINE(ic) = tree->values.inlineasm;
2698 /*-----------------------------------------------------------------*/
2699 /* ast2iCode - creates an icodeList from an ast */
2700 /*-----------------------------------------------------------------*/
2701 operand *ast2iCode (ast *tree)
2703 operand *left = NULL;
2704 operand *right= NULL;
2709 /* set the global variables for filename & line number */
2710 if ( tree->filename )
2711 filename = tree->filename ;
2713 lineno = tree->lineno ;
2715 block = tree->block ;
2717 scopeLevel = tree->level;
2719 if (tree->type == EX_VALUE )
2720 return operandFromValue(tree->opval.val);
2722 if (tree->type == EX_LINK )
2723 return operandFromLink (tree->opval.lnk);
2725 /* if we find a nullop */
2726 if (tree->type == EX_OP &&
2727 ( tree->opval.op == NULLOP ||
2728 tree->opval.op == BLOCK )) {
2729 ast2iCode (tree->left);
2730 ast2iCode (tree->right);
2734 /* special cases for not evaluating */
2735 if ( tree->opval.op != ':' &&
2736 tree->opval.op != '?' &&
2737 tree->opval.op != CALL &&
2738 tree->opval.op != IFX &&
2739 tree->opval.op != LABEL &&
2740 tree->opval.op != GOTO &&
2741 tree->opval.op != SWITCH &&
2742 tree->opval.op != FUNCTION &&
2743 tree->opval.op != INLINEASM ) {
2744 if (IS_ASSIGN_OP(tree->opval.op) ||
2745 IS_DEREF_OP(tree) ||
2746 (tree->opval.op == '&' && !tree->right) ||
2747 tree->opval.op == PTR_OP) {
2749 left = operandFromAst(tree->left);
2752 left = operandFromAst(tree->left);
2754 if (tree->opval.op == INC_OP ||
2755 tree->opval.op == DEC_OP) {
2757 right= operandFromAst(tree->right);
2760 right= operandFromAst(tree->right);
2764 /* now depending on the type of operand */
2765 /* this will be a biggy */
2766 switch (tree->opval.op) {
2768 case '[' : /* array operation */
2770 link *ltype = operandType(left);
2771 left= geniCodeRValue (left,IS_PTR(ltype->next) ? TRUE : FALSE);
2772 right=geniCodeRValue (right,TRUE);
2775 return geniCodeArray (left,right);
2777 case '.' : /* structure dereference */
2778 if (IS_PTR(operandType(left)))
2779 left = geniCodeRValue(left,TRUE);
2781 left = geniCodeRValue(left,FALSE);
2783 return geniCodeStruct (left,right,tree->lvalue);
2785 case PTR_OP: /* structure pointer dereference */
2788 pType = operandType(left);
2789 left = geniCodeRValue(left,TRUE);
2791 setOClass (pType,getSpec(operandType(left)));
2794 return geniCodeStruct (left, right,tree->lvalue);
2796 case INC_OP: /* increment operator */
2798 return geniCodePostInc (left);
2800 return geniCodePreInc (right);
2802 case DEC_OP: /* decrement operator */
2804 return geniCodePostDec (left);
2806 return geniCodePreDec (right);
2808 case '&' : /* bitwise and or address of operator */
2809 if ( right ) { /* this is a bitwise operator */
2810 left= geniCodeRValue(left,FALSE);
2811 right= geniCodeRValue(right,FALSE);
2812 return geniCodeBitwise (left,right,BITWISEAND,tree->ftype);
2814 return geniCodeAddressOf (left);
2816 case '|': /* bitwise or & xor */
2818 return geniCodeBitwise (geniCodeRValue(left,FALSE),
2819 geniCodeRValue(right,FALSE),
2824 return geniCodeDivision (geniCodeRValue(left,FALSE),
2825 geniCodeRValue(right,FALSE));
2828 return geniCodeModulus (geniCodeRValue(left,FALSE),
2829 geniCodeRValue(right,FALSE));
2832 return geniCodeMultiply (geniCodeRValue(left,FALSE),
2833 geniCodeRValue(right,FALSE));
2835 return geniCodeDerefPtr (geniCodeRValue(left,FALSE));
2839 return geniCodeSubtract (geniCodeRValue(left,FALSE),
2840 geniCodeRValue(right,FALSE));
2842 return geniCodeUnaryMinus (geniCodeRValue(left,FALSE));
2846 return geniCodeAdd (geniCodeRValue(left,FALSE),
2847 geniCodeRValue(right,FALSE));
2849 return geniCodeRValue(left,FALSE) ; /* unary '+' has no meaning */
2852 return geniCodeLeftShift (geniCodeRValue(left,FALSE),
2853 geniCodeRValue(right,FALSE));
2856 return geniCodeRightShift (geniCodeRValue(left,FALSE),
2857 geniCodeRValue(right,FALSE));
2859 return geniCodeCast (operandType(left),
2860 geniCodeRValue(right,FALSE),FALSE);
2866 return geniCodeUnary (geniCodeRValue(left,FALSE),tree->opval.op);
2870 operand *op = geniCodeUnary (geniCodeRValue(left,FALSE),tree->opval.op);
2871 setOperandType(op, UCHARTYPE);
2882 return geniCodeLogic (geniCodeRValue(left,FALSE),
2883 geniCodeRValue(right,FALSE),
2886 return geniCodeConditional (tree);
2889 return operandFromLit(getSize(tree->right->ftype));
2893 link *rtype = operandType(right);
2894 link *ltype = operandType(left);
2895 if (IS_PTR(rtype) && IS_ITEMP(right)
2896 && right->isaddr && checkType(rtype->next,ltype)==1)
2897 right = geniCodeRValue(right,TRUE);
2899 right = geniCodeRValue(right,FALSE);
2901 geniCodeAssign (left,right,0);
2906 geniCodeAssign(left,
2907 geniCodeMultiply(geniCodeRValue (operandFromOperand(left),
2909 geniCodeRValue(right,FALSE)),0);
2913 geniCodeAssign(left,
2914 geniCodeDivision(geniCodeRValue(operandFromOperand(left),
2916 geniCodeRValue(right,FALSE)),0);
2919 geniCodeAssign(left,
2920 geniCodeModulus(geniCodeRValue(operandFromOperand(left),
2922 geniCodeRValue(right,FALSE)),0);
2925 link *rtype = operandType(right);
2926 link *ltype = operandType(left);
2927 if (IS_PTR(rtype) && IS_ITEMP(right)
2928 && right->isaddr && checkType(rtype->next,ltype)==1)
2929 right = geniCodeRValue(right,TRUE);
2931 right = geniCodeRValue(right,FALSE);
2934 return geniCodeAssign(left,
2935 geniCodeAdd (geniCodeRValue(operandFromOperand(left),
2941 link *rtype = operandType(right);
2942 link *ltype = operandType(left);
2943 if (IS_PTR(rtype) && IS_ITEMP(right)
2944 && right->isaddr && checkType(rtype->next,ltype)==1) {
2945 right = geniCodeRValue(right,TRUE);
2948 right = geniCodeRValue(right,FALSE);
2951 geniCodeAssign (left,
2952 geniCodeSubtract(geniCodeRValue(operandFromOperand(left),
2958 geniCodeAssign (left,
2959 geniCodeLeftShift(geniCodeRValue(operandFromOperand(left)
2961 geniCodeRValue(right,FALSE)),0);
2964 geniCodeAssign(left,
2965 geniCodeRightShift(geniCodeRValue(operandFromOperand(left)
2967 geniCodeRValue(right,FALSE)),0);
2970 geniCodeAssign (left,
2971 geniCodeBitwise(geniCodeRValue(operandFromOperand(left),
2973 geniCodeRValue(right,FALSE),
2975 operandType(left)),0);
2978 geniCodeAssign (left,
2979 geniCodeBitwise (geniCodeRValue(operandFromOperand(left),
2981 geniCodeRValue(right,FALSE),
2983 operandType(left)),0);
2986 geniCodeAssign (left,
2987 geniCodeBitwise (geniCodeRValue(operandFromOperand(left)
2989 geniCodeRValue(right,FALSE),
2991 operandType(left)),0);
2993 return geniCodeRValue(right,FALSE);
2996 return geniCodeCall (ast2iCode(tree->left),
2999 geniCodeLabel(ast2iCode(tree->left)->operand.symOperand);
3000 return ast2iCode (tree->right);
3003 geniCodeGoto (ast2iCode(tree->left)->operand.symOperand);
3004 return ast2iCode (tree->right);
3007 geniCodeFunctionBody ( tree );
3011 geniCodeReturn (right);
3019 geniCodeSwitch (tree);
3023 geniCodeInline (tree);
3030 /*-----------------------------------------------------------------*/
3031 /* reverseICChain - gets from the list and creates a linkedlist */
3032 /*-----------------------------------------------------------------*/
3033 iCode *reverseiCChain ()
3035 iCode *loop = NULL ;
3036 iCode *prev = NULL ;
3038 while ((loop = getSet(&iCodeChain))) {
3049 /*-----------------------------------------------------------------*/
3050 /* iCodeFromAst - given an ast will convert it to iCode */
3051 /*-----------------------------------------------------------------*/
3052 iCode *iCodeFromAst ( ast *tree )
3054 returnLabel = newiTempLabel("_return");
3055 entryLabel = newiTempLabel("_entry") ;
3057 return reverseiCChain ();