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 /* this must be a lvalue */
1930 if (!op->isaddr && !IS_AGGREGATE(optype)) {
1931 werror (E_LVALUE_REQUIRED,"&");
1936 p->class = DECLARATOR ;
1938 /* set the pointer depending on the storage class */
1939 if ((DCL_TYPE(p) = PTR_TYPE(SPEC_OCLS(opetype))) == CPOINTER)
1940 DCL_PTR_CONST(p) = 1;
1942 /* make sure we preserve the const & volatile */
1943 if (IS_CONSTANT(opetype))
1944 DCL_PTR_CONST(p) = 1;
1946 if (IS_VOLATILE(opetype))
1947 DCL_PTR_VOLATILE(p) = 1;
1949 p->next = copyLinkChain(optype);
1951 /* if already a temp */
1953 setOperandType (op,p);
1958 /* other wise make this of the type coming in */
1959 ic = newiCode(ADDRESS_OF,op,NULL);
1960 IC_RESULT(ic) = newiTempOperand(p,1);
1961 IC_RESULT(ic)->isaddr = 0;
1963 return IC_RESULT(ic);
1965 /*-----------------------------------------------------------------*/
1966 /* setOClass - sets the output class depending on the pointer type */
1967 /*-----------------------------------------------------------------*/
1968 void setOClass (link *ptr, link *spec)
1970 switch (DCL_TYPE(ptr)) {
1972 SPEC_OCLS(spec) = data ;
1976 SPEC_OCLS(spec) = generic;
1980 SPEC_OCLS(spec) = xdata ;
1984 SPEC_OCLS(spec) = code ;
1988 SPEC_OCLS(spec) = idata;
1992 SPEC_OCLS(spec) = xstack;
1997 /*-----------------------------------------------------------------*/
1998 /* geniCodeDerefPtr - dereference pointer with '*' */
1999 /*-----------------------------------------------------------------*/
2000 operand *geniCodeDerefPtr (operand *op)
2002 link *rtype , *retype ;
2003 link *optype = operandType(op);
2005 /* if this is a pointer then generate the rvalue */
2006 if (IS_PTR(optype)) {
2007 if (IS_TRUE_SYMOP(op)) {
2009 op = geniCodeRValue(op,TRUE);
2012 op = geniCodeRValue(op,TRUE);
2015 /* now get rid of the pointer part */
2016 if (lvaluereq && IS_ITEMP(op) )
2018 retype = getSpec(rtype = copyLinkChain(optype)) ;
2022 retype = getSpec(rtype = copyLinkChain(optype->next)) ;
2025 /* if this is a pointer then outputclass needs 2b updated */
2027 setOClass(optype,retype);
2029 op->isGptr = IS_GENPTR(optype);
2031 /* if the pointer was declared as a constant */
2032 /* then we cannot allow assignment to the derefed */
2033 if (IS_PTR_CONST(optype))
2034 SPEC_CONST(retype) = 1;
2036 op->isaddr = (IS_PTR(rtype) ||
2043 op = geniCodeRValue(op,TRUE);
2045 setOperandType(op,rtype);
2050 /*-----------------------------------------------------------------*/
2051 /* geniCodeUnaryMinus - does a unary minus of the operand */
2052 /*-----------------------------------------------------------------*/
2053 operand *geniCodeUnaryMinus (operand *op)
2056 link *optype = operandType(op);
2058 if (IS_LITERAL(optype))
2059 return operandFromLit(- floatFromVal(op->operand.valOperand));
2061 ic = newiCode(UNARYMINUS,op,NULL);
2062 IC_RESULT(ic) = newiTempOperand(optype,0);
2064 return IC_RESULT(ic);
2067 /*-----------------------------------------------------------------*/
2068 /* geniCodeLeftShift - gen i code for left shift */
2069 /*-----------------------------------------------------------------*/
2070 operand *geniCodeLeftShift (operand *left, operand *right)
2073 link *ltype = operandType(left);
2075 ic = newiCode(LEFT_OP,left,right);
2076 IC_RESULT(ic) = newiTempOperand(ltype,0);
2078 return IC_RESULT(ic) ;
2081 /*-----------------------------------------------------------------*/
2082 /* geniCodeRightShift - gen i code for right shift */
2083 /*-----------------------------------------------------------------*/
2084 operand *geniCodeRightShift (operand *left, operand *right)
2087 link *ltype = operandType(left);
2089 ic = newiCode(RIGHT_OP,left,right);
2090 IC_RESULT(ic) = newiTempOperand(ltype,0);
2092 return IC_RESULT(ic) ;
2096 #define LONG_LONG __int64
2098 #define LONG_LONG long long
2101 /*-----------------------------------------------------------------*/
2102 /* geniCodeLogic- logic code */
2103 /*-----------------------------------------------------------------*/
2104 operand *geniCodeLogic (operand *left, operand *right, int op )
2108 link *rtype = operandType(right);
2109 link *ltype = operandType(left);
2111 /* left is integral type and right is literal then
2112 check if the literal value is within bounds */
2113 if (IS_INTEGRAL(ltype) && IS_LITERAL(rtype)) {
2114 int nbits = bitsForType(ltype);
2115 long v = operandLitValue(right);
2117 if (v > ((LONG_LONG) 1 << nbits) && v > 0)
2118 werror(W_CONST_RANGE," compare operation ");
2121 ctype = computeType(ltype,rtype);
2122 left = geniCodeCast(ctype,left,TRUE);
2123 right= geniCodeCast(ctype,right,TRUE);
2125 ic = newiCode(op,left,right);
2126 IC_RESULT(ic) = newiTempOperand (newCharLink(),1);
2128 /* if comparing anything greater than one byte
2129 and not a '==' || '!=' || '&&' || '||' (these
2131 if (getSize(ctype) > 1 &&
2139 return IC_RESULT(ic);
2142 /*-----------------------------------------------------------------*/
2143 /* geniCodeUnary - for a a generic unary operation */
2144 /*-----------------------------------------------------------------*/
2145 operand *geniCodeUnary (operand *op, int oper )
2147 iCode *ic = newiCode (oper,op,NULL);
2149 IC_RESULT(ic)= newiTempOperand(operandType(op),0);
2151 return IC_RESULT(ic) ;
2154 /*-----------------------------------------------------------------*/
2155 /* geniCodeConditional - geniCode for '?' ':' operation */
2156 /*-----------------------------------------------------------------*/
2157 operand *geniCodeConditional (ast *tree)
2160 symbol *falseLabel = newiTempLabel(NULL);
2161 symbol *exitLabel = newiTempLabel(NULL);
2162 operand *cond = ast2iCode(tree->left);
2163 operand *true, *false , *result;
2165 ic = newiCodeCondition(geniCodeRValue(cond,FALSE),
2169 true = ast2iCode(tree->right->left);
2171 /* move the value to a new Operand */
2172 result = newiTempOperand(operandType(true),0);
2173 geniCodeAssign(result,geniCodeRValue(true,FALSE),0);
2175 /* generate an unconditional goto */
2176 geniCodeGoto(exitLabel);
2178 /* now for the right side */
2179 geniCodeLabel(falseLabel);
2181 false = ast2iCode(tree->right->right);
2182 geniCodeAssign(result,geniCodeRValue(false,FALSE),0);
2184 /* create the exit label */
2185 geniCodeLabel(exitLabel);
2190 /*-----------------------------------------------------------------*/
2191 /* geniCodeAssign - generate code for assignment */
2192 /*-----------------------------------------------------------------*/
2193 operand *geniCodeAssign (operand *left, operand *right, int nosupdate)
2196 link *ltype = operandType(left);
2197 link *rtype = operandType(right);
2199 if (!left->isaddr && !IS_ITEMP(left)) {
2200 werror(E_LVALUE_REQUIRED,"assignment");
2204 /* left is integral type and right is literal then
2205 check if the literal value is within bounds */
2206 if (IS_INTEGRAL(ltype) && right->type == VALUE && IS_LITERAL(rtype)) {
2207 int nbits = bitsForType(ltype);
2208 long v = operandLitValue(right);
2210 if (v > ((LONG_LONG)1 << nbits) && v > 0)
2211 werror(W_CONST_RANGE," = operation");
2214 /* if the left & right type don't exactly match */
2215 /* if pointer set then make sure the check is
2216 done with the type & not the pointer */
2217 /* then cast rights type to left */
2219 /* first check the type for pointer assignement */
2220 if (left->isaddr && IS_PTR(ltype) && IS_ITEMP(left) &&
2221 checkType(ltype,rtype)<0) {
2222 if (checkType(ltype->next,rtype) < 0)
2223 right = geniCodeCast(ltype->next,right,TRUE);
2225 if (checkType(ltype,rtype) < 0 )
2226 right = geniCodeCast(ltype,right,TRUE);
2228 /* if left is a true symbol & ! volatile
2229 create an assignment to temporary for
2230 the right & then assign this temporary
2231 to the symbol this is SSA . isn't it simple
2232 and folks have published mountains of paper on it */
2233 if (IS_TRUE_SYMOP(left) &&
2234 !isOperandVolatile(left,FALSE) &&
2235 isOperandGlobal(left)) {
2238 if (IS_TRUE_SYMOP(right))
2239 sym = OP_SYMBOL(right);
2240 ic = newiCode('=',NULL,right);
2241 IC_RESULT(ic) = right = newiTempOperand(ltype,0);
2242 SPIL_LOC(right) = sym ;
2246 ic = newiCode('=',NULL,right);
2247 IC_RESULT(ic) = left;
2250 /* if left isgptr flag is set then support
2251 routine will be required */
2255 ic->nosupdate = nosupdate;
2259 /*-----------------------------------------------------------------*/
2260 /* geniCodeSEParms - generate code for side effecting fcalls */
2261 /*-----------------------------------------------------------------*/
2262 static void geniCodeSEParms (ast *parms)
2267 if (parms->type == EX_OP && parms->opval.op == PARAM) {
2268 geniCodeSEParms (parms->left) ;
2269 geniCodeSEParms (parms->right);
2273 /* hack don't like this but too lazy to think of
2275 if (IS_ADDRESS_OF_OP(parms))
2276 parms->left->lvalue = 1;
2278 if (IS_CAST_OP(parms) &&
2279 IS_PTR(parms->ftype) &&
2280 IS_ADDRESS_OF_OP(parms->right))
2281 parms->right->left->lvalue = 1;
2283 parms->opval.oprnd =
2284 geniCodeRValue(ast2iCode (parms),FALSE);
2286 parms->type = EX_OPERAND ;
2289 /*-----------------------------------------------------------------*/
2290 /* geniCodeParms - generates parameters */
2291 /*-----------------------------------------------------------------*/
2292 static void geniCodeParms ( ast *parms , int *stack, link *fetype)
2300 /* if this is a param node then do the left & right */
2301 if (parms->type == EX_OP && parms->opval.op == PARAM) {
2302 geniCodeParms (parms->left, stack,fetype) ;
2303 geniCodeParms (parms->right, stack,fetype);
2307 /* get the parameter value */
2308 if (parms->type == EX_OPERAND)
2309 pval = parms->opval.oprnd ;
2311 /* maybe this else should go away ?? */
2312 /* hack don't like this but too lazy to think of
2314 if (IS_ADDRESS_OF_OP(parms))
2315 parms->left->lvalue = 1;
2317 if (IS_CAST_OP(parms) &&
2318 IS_PTR(parms->ftype) &&
2319 IS_ADDRESS_OF_OP(parms->right))
2320 parms->right->left->lvalue = 1;
2322 pval = geniCodeRValue(ast2iCode (parms),FALSE);
2325 /* if register parm then make it a send */
2326 if ((parms->argSym && IS_REGPARM(parms->argSym->etype)) ||
2327 IS_REGPARM(parms->etype)) {
2328 ic = newiCode(SEND,pval,NULL);
2331 /* now decide whether to push or assign */
2332 if (!(options.stackAuto || IS_RENT(fetype))) {
2335 operand *top = operandFromSymbol(parms->argSym);
2336 geniCodeAssign(top,pval,1);
2339 link *p = operandType(pval);
2341 ic = newiCode(IPUSH,pval,NULL);
2343 /* update the stack adjustment */
2344 *stack += getSize(IS_AGGREGATE(p)? aggrToPtr(p,FALSE):p);
2351 /*-----------------------------------------------------------------*/
2352 /* geniCodeCall - generates temp code for calling */
2353 /*-----------------------------------------------------------------*/
2354 operand *geniCodeCall (operand *left, ast *parms)
2361 /* take care of parameters with side-effecting
2362 function calls in them, this is required to take care
2363 of overlaying function parameters */
2364 geniCodeSEParms ( parms );
2366 /* first the parameters */
2367 geniCodeParms ( parms , &stack , getSpec(operandType(left)));
2369 /* now call : if symbol then pcall */
2371 ic = newiCode(PCALL,left,NULL);
2373 ic = newiCode(CALL,left,NULL);
2375 IC_ARGS(ic) = left->operand.symOperand->args ;
2376 type = copyLinkChain(operandType(left)->next);
2377 etype = getSpec(type);
2378 SPEC_EXTR(etype) = 0;
2379 IC_RESULT(ic) = result = newiTempOperand(type,1);
2383 /* stack adjustment after call */
2384 left->parmBytes = stack;
2389 /*-----------------------------------------------------------------*/
2390 /* geniCodeReceive - generate intermediate code for "receive" */
2391 /*-----------------------------------------------------------------*/
2392 static void geniCodeReceive (value *args)
2394 /* for all arguments that are passed in registers */
2397 if (IS_REGPARM(args->etype)) {
2398 operand *opr = operandFromValue(args);
2400 symbol *sym = OP_SYMBOL(opr);
2403 /* we will use it after all optimizations
2404 and before liveRange calculation */
2405 if (!sym->addrtaken &&
2406 !IS_VOLATILE(sym->etype) &&
2407 !IN_FARSPACE(SPEC_OCLS(sym->etype))) {
2408 opl = newiTempOperand(args->type,0);
2410 sym->reqv->key = sym->key ;
2411 OP_SYMBOL(sym->reqv)->key = sym->key;
2412 OP_SYMBOL(sym->reqv)->isreqv = 1;
2413 OP_SYMBOL(sym->reqv)->islocal= 0;
2414 SPIL_LOC(sym->reqv) = sym;
2417 ic = newiCode(RECEIVE,NULL,NULL);
2418 currFunc->recvSize = getSize(sym->etype);
2419 IC_RESULT(ic) = opr;
2427 /*-----------------------------------------------------------------*/
2428 /* geniCodeFunctionBody - create the function body */
2429 /*-----------------------------------------------------------------*/
2430 void geniCodeFunctionBody (ast *tree)
2437 /* reset the auto generation */
2443 func = ast2iCode(tree->left);
2444 fetype = getSpec(operandType(func));
2446 savelineno = lineno;
2447 lineno = OP_SYMBOL(func)->lineDef;
2448 /* create an entry label */
2449 geniCodeLabel(entryLabel);
2450 lineno = savelineno;
2452 /* create a proc icode */
2453 ic = newiCode(FUNCTION,func,NULL);
2454 /* if the function has parmas then */
2455 /* save the parameters information */
2456 ic->argLabel.args = tree->values.args ;
2457 ic->lineno = OP_SYMBOL(func)->lineDef;
2461 /* for all parameters that are passed
2462 on registers add a "receive" */
2463 geniCodeReceive( tree->values.args );
2465 /* generate code for the body */
2466 ast2iCode(tree->right);
2468 /* create a label for return */
2469 geniCodeLabel(returnLabel);
2471 /* now generate the end proc */
2472 ic = newiCode(ENDFUNCTION,func,NULL);
2477 /*-----------------------------------------------------------------*/
2478 /* geniCodeReturn - gen icode for 'return' statement */
2479 /*-----------------------------------------------------------------*/
2480 void geniCodeReturn (operand *op)
2484 /* if the operand is present force an rvalue */
2486 op = geniCodeRValue(op,FALSE);
2488 ic = newiCode(RETURN,op,NULL);
2492 /*-----------------------------------------------------------------*/
2493 /* geniCodeIfx - generates code for extended if statement */
2494 /*-----------------------------------------------------------------*/
2495 void geniCodeIfx (ast *tree)
2498 operand *condition = ast2iCode(tree->left);
2501 /* if condition is null then exit */
2505 condition = geniCodeRValue(condition,FALSE);
2507 cetype = getSpec(operandType(condition));
2508 /* if the condition is a literal */
2509 if (IS_LITERAL(cetype)) {
2510 if (floatFromVal(condition->operand.valOperand)) {
2511 if (tree->trueLabel)
2512 geniCodeGoto(tree->trueLabel);
2517 if (tree->falseLabel)
2518 geniCodeGoto (tree->falseLabel);
2525 if ( tree->trueLabel ) {
2526 ic = newiCodeCondition(condition,
2531 if ( tree->falseLabel)
2532 geniCodeGoto(tree->falseLabel);
2535 ic = newiCodeCondition (condition,
2542 ast2iCode(tree->right);
2545 /*-----------------------------------------------------------------*/
2546 /* geniCodeJumpTable - tries to create a jump table for switch */
2547 /*-----------------------------------------------------------------*/
2548 int geniCodeJumpTable (operand *cond, value *caseVals, ast *tree)
2550 int min = 0 ,max = 0, t, cnt = 0;
2555 set *labels = NULL ;
2557 if (!tree || !caseVals)
2560 /* the criteria for creating a jump table is */
2561 /* all integer numbers between the maximum & minimum must */
2562 /* be present , the maximum value should not exceed 255 */
2563 min = max = (int)floatFromVal(vch = caseVals);
2564 sprintf(buffer,"_case_%d_%d",
2565 tree->values.switchVals.swNum,
2567 addSet(&labels,newiTempLabel(buffer));
2569 /* if there is only one case value then no need */
2570 if (!(vch = vch->next ))
2574 if (((t = (int)floatFromVal(vch)) - max) != 1)
2576 sprintf(buffer,"_case_%d_%d",
2577 tree->values.switchVals.swNum,
2579 addSet(&labels,newiTempLabel(buffer));
2585 /* if the number of case statements <= 2 then */
2586 /* it is not economical to create the jump table */
2587 /* since two compares are needed for boundary conditions */
2588 if ((! optimize.noJTabBoundary && cnt <= 2) || max > (255/3))
2591 if ( tree->values.switchVals.swDefault )
2592 sprintf (buffer,"_default_%d",tree->values.switchVals.swNum);
2594 sprintf (buffer,"_swBrk_%d",tree->values.switchVals.swNum );
2596 falseLabel = newiTempLabel (buffer);
2598 /* so we can create a jumptable */
2599 /* first we rule out the boundary conditions */
2600 /* if only optimization says so */
2601 if ( ! optimize.noJTabBoundary ) {
2602 link *cetype = getSpec(operandType(cond));
2603 /* no need to check the lower bound if
2604 the condition is unsigned & minimum value is zero */
2605 if (!( min == 0 && SPEC_USIGN(cetype))) {
2606 boundary = geniCodeLogic (cond,operandFromLit(min),'<');
2607 ic = newiCodeCondition (boundary,falseLabel,NULL);
2611 /* now for upper bounds */
2612 boundary = geniCodeLogic(cond,operandFromLit(max),'>');
2613 ic = newiCodeCondition (boundary,falseLabel,NULL);
2617 /* if the min is not zero then we no make it zero */
2619 cond = geniCodeSubtract(cond,operandFromLit(min));
2620 setOperandType(cond, UCHARTYPE);
2623 /* now create the jumptable */
2624 ic = newiCode(JUMPTABLE,NULL,NULL);
2625 IC_JTCOND(ic) = cond;
2626 IC_JTLABELS(ic) = labels;
2631 /*-----------------------------------------------------------------*/
2632 /* geniCodeSwitch - changes a switch to a if statement */
2633 /*-----------------------------------------------------------------*/
2634 void geniCodeSwitch (ast *tree)
2637 operand *cond = geniCodeRValue(ast2iCode (tree->left),FALSE);
2638 value *caseVals = tree->values.switchVals.swVals ;
2639 symbol *trueLabel , *falseLabel;
2641 /* if we can make this a jump table */
2642 if ( geniCodeJumpTable (cond,caseVals,tree) )
2643 goto jumpTable ; /* no need for the comparison */
2645 /* for the cases defined do */
2648 operand *compare = geniCodeLogic (cond,
2649 operandFromValue(caseVals),
2652 sprintf(buffer,"_case_%d_%d",
2653 tree->values.switchVals.swNum,
2654 (int) floatFromVal(caseVals));
2655 trueLabel = newiTempLabel(buffer);
2657 ic = newiCodeCondition(compare,trueLabel,NULL);
2659 caseVals = caseVals->next;
2664 /* if default is present then goto break else break */
2665 if ( tree->values.switchVals.swDefault )
2666 sprintf (buffer,"_default_%d",tree->values.switchVals.swNum);
2668 sprintf (buffer,"_swBrk_%d",tree->values.switchVals.swNum );
2670 falseLabel = newiTempLabel (buffer);
2671 geniCodeGoto(falseLabel);
2674 ast2iCode(tree->right);
2677 /*-----------------------------------------------------------------*/
2678 /* geniCodeInline - intermediate code for inline assembler */
2679 /*-----------------------------------------------------------------*/
2680 static void geniCodeInline (ast *tree)
2684 ic = newiCode(INLINEASM,NULL,NULL);
2685 IC_INLINE(ic) = tree->values.inlineasm;
2689 /*-----------------------------------------------------------------*/
2690 /* ast2iCode - creates an icodeList from an ast */
2691 /*-----------------------------------------------------------------*/
2692 operand *ast2iCode (ast *tree)
2694 operand *left = NULL;
2695 operand *right= NULL;
2700 /* set the global variables for filename & line number */
2701 if ( tree->filename )
2702 filename = tree->filename ;
2704 lineno = tree->lineno ;
2706 block = tree->block ;
2708 scopeLevel = tree->level;
2710 if (tree->type == EX_VALUE )
2711 return operandFromValue(tree->opval.val);
2713 if (tree->type == EX_LINK )
2714 return operandFromLink (tree->opval.lnk);
2716 /* if we find a nullop */
2717 if (tree->type == EX_OP &&
2718 ( tree->opval.op == NULLOP ||
2719 tree->opval.op == BLOCK )) {
2720 ast2iCode (tree->left);
2721 ast2iCode (tree->right);
2725 /* special cases for not evaluating */
2726 if ( tree->opval.op != ':' &&
2727 tree->opval.op != '?' &&
2728 tree->opval.op != CALL &&
2729 tree->opval.op != IFX &&
2730 tree->opval.op != LABEL &&
2731 tree->opval.op != GOTO &&
2732 tree->opval.op != SWITCH &&
2733 tree->opval.op != FUNCTION &&
2734 tree->opval.op != INLINEASM ) {
2735 if (IS_ASSIGN_OP(tree->opval.op) ||
2736 IS_DEREF_OP(tree) ||
2737 (tree->opval.op == '&' && !tree->right) ||
2738 tree->opval.op == PTR_OP) {
2740 left = operandFromAst(tree->left);
2743 left = operandFromAst(tree->left);
2745 if (tree->opval.op == INC_OP ||
2746 tree->opval.op == DEC_OP) {
2748 right= operandFromAst(tree->right);
2751 right= operandFromAst(tree->right);
2755 /* now depending on the type of operand */
2756 /* this will be a biggy */
2757 switch (tree->opval.op) {
2759 case '[' : /* array operation */
2761 link *ltype = operandType(left);
2762 left= geniCodeRValue (left,IS_PTR(ltype->next) ? TRUE : FALSE);
2763 right=geniCodeRValue (right,TRUE);
2766 return geniCodeArray (left,right);
2768 case '.' : /* structure dereference */
2769 if (IS_PTR(operandType(left)))
2770 left = geniCodeRValue(left,TRUE);
2772 left = geniCodeRValue(left,FALSE);
2774 return geniCodeStruct (left,right,tree->lvalue);
2776 case PTR_OP: /* structure pointer dereference */
2779 pType = operandType(left);
2780 left = geniCodeRValue(left,TRUE);
2782 setOClass (pType,getSpec(operandType(left)));
2785 return geniCodeStruct (left, right,tree->lvalue);
2787 case INC_OP: /* increment operator */
2789 return geniCodePostInc (left);
2791 return geniCodePreInc (right);
2793 case DEC_OP: /* decrement operator */
2795 return geniCodePostDec (left);
2797 return geniCodePreDec (right);
2799 case '&' : /* bitwise and or address of operator */
2800 if ( right ) { /* this is a bitwise operator */
2801 left= geniCodeRValue(left,FALSE);
2802 right= geniCodeRValue(right,FALSE);
2803 return geniCodeBitwise (left,right,BITWISEAND,tree->ftype);
2805 return geniCodeAddressOf (left);
2807 case '|': /* bitwise or & xor */
2809 return geniCodeBitwise (geniCodeRValue(left,FALSE),
2810 geniCodeRValue(right,FALSE),
2815 return geniCodeDivision (geniCodeRValue(left,FALSE),
2816 geniCodeRValue(right,FALSE));
2819 return geniCodeModulus (geniCodeRValue(left,FALSE),
2820 geniCodeRValue(right,FALSE));
2823 return geniCodeMultiply (geniCodeRValue(left,FALSE),
2824 geniCodeRValue(right,FALSE));
2826 return geniCodeDerefPtr (geniCodeRValue(left,FALSE));
2830 return geniCodeSubtract (geniCodeRValue(left,FALSE),
2831 geniCodeRValue(right,FALSE));
2833 return geniCodeUnaryMinus (geniCodeRValue(left,FALSE));
2837 return geniCodeAdd (geniCodeRValue(left,FALSE),
2838 geniCodeRValue(right,FALSE));
2840 return geniCodeRValue(left,FALSE) ; /* unary '+' has no meaning */
2843 return geniCodeLeftShift (geniCodeRValue(left,FALSE),
2844 geniCodeRValue(right,FALSE));
2847 return geniCodeRightShift (geniCodeRValue(left,FALSE),
2848 geniCodeRValue(right,FALSE));
2850 return geniCodeCast (operandType(left),
2851 geniCodeRValue(right,FALSE),FALSE);
2857 return geniCodeUnary (geniCodeRValue(left,FALSE),tree->opval.op);
2861 operand *op = geniCodeUnary (geniCodeRValue(left,FALSE),tree->opval.op);
2862 setOperandType(op, UCHARTYPE);
2873 return geniCodeLogic (geniCodeRValue(left,FALSE),
2874 geniCodeRValue(right,FALSE),
2877 return geniCodeConditional (tree);
2880 return operandFromLit(getSize(tree->right->ftype));
2884 link *rtype = operandType(right);
2885 link *ltype = operandType(left);
2886 if (IS_PTR(rtype) && IS_ITEMP(right)
2887 && right->isaddr && checkType(rtype->next,ltype)==1)
2888 right = geniCodeRValue(right,TRUE);
2890 right = geniCodeRValue(right,FALSE);
2892 geniCodeAssign (left,right,0);
2897 geniCodeAssign(left,
2898 geniCodeMultiply(geniCodeRValue (operandFromOperand(left),
2900 geniCodeRValue(right,FALSE)),0);
2904 geniCodeAssign(left,
2905 geniCodeDivision(geniCodeRValue(operandFromOperand(left),
2907 geniCodeRValue(right,FALSE)),0);
2910 geniCodeAssign(left,
2911 geniCodeModulus(geniCodeRValue(operandFromOperand(left),
2913 geniCodeRValue(right,FALSE)),0);
2916 link *rtype = operandType(right);
2917 link *ltype = operandType(left);
2918 if (IS_PTR(rtype) && IS_ITEMP(right)
2919 && right->isaddr && checkType(rtype->next,ltype)==1)
2920 right = geniCodeRValue(right,TRUE);
2922 right = geniCodeRValue(right,FALSE);
2925 return geniCodeAssign(left,
2926 geniCodeAdd (geniCodeRValue(operandFromOperand(left),
2932 link *rtype = operandType(right);
2933 link *ltype = operandType(left);
2934 if (IS_PTR(rtype) && IS_ITEMP(right)
2935 && right->isaddr && checkType(rtype->next,ltype)==1) {
2936 right = geniCodeRValue(right,TRUE);
2939 right = geniCodeRValue(right,FALSE);
2942 geniCodeAssign (left,
2943 geniCodeSubtract(geniCodeRValue(operandFromOperand(left),
2949 geniCodeAssign (left,
2950 geniCodeLeftShift(geniCodeRValue(operandFromOperand(left)
2952 geniCodeRValue(right,FALSE)),0);
2955 geniCodeAssign(left,
2956 geniCodeRightShift(geniCodeRValue(operandFromOperand(left)
2958 geniCodeRValue(right,FALSE)),0);
2961 geniCodeAssign (left,
2962 geniCodeBitwise(geniCodeRValue(operandFromOperand(left),
2964 geniCodeRValue(right,FALSE),
2966 operandType(left)),0);
2969 geniCodeAssign (left,
2970 geniCodeBitwise (geniCodeRValue(operandFromOperand(left),
2972 geniCodeRValue(right,FALSE),
2974 operandType(left)),0);
2977 geniCodeAssign (left,
2978 geniCodeBitwise (geniCodeRValue(operandFromOperand(left)
2980 geniCodeRValue(right,FALSE),
2982 operandType(left)),0);
2984 return geniCodeRValue(right,FALSE);
2987 return geniCodeCall (ast2iCode(tree->left),
2990 geniCodeLabel(ast2iCode(tree->left)->operand.symOperand);
2991 return ast2iCode (tree->right);
2994 geniCodeGoto (ast2iCode(tree->left)->operand.symOperand);
2995 return ast2iCode (tree->right);
2998 geniCodeFunctionBody ( tree );
3002 geniCodeReturn (right);
3010 geniCodeSwitch (tree);
3014 geniCodeInline (tree);
3021 /*-----------------------------------------------------------------*/
3022 /* reverseICChain - gets from the list and creates a linkedlist */
3023 /*-----------------------------------------------------------------*/
3024 iCode *reverseiCChain ()
3026 iCode *loop = NULL ;
3027 iCode *prev = NULL ;
3029 while ((loop = getSet(&iCodeChain))) {
3040 /*-----------------------------------------------------------------*/
3041 /* iCodeFromAst - given an ast will convert it to iCode */
3042 /*-----------------------------------------------------------------*/
3043 iCode *iCodeFromAst ( ast *tree )
3045 returnLabel = newiTempLabel("_return");
3046 entryLabel = newiTempLabel("_entry") ;
3048 return reverseiCChain ();