1 /*-------------------------------------------------------------------------
3 SDCCicode.h - 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 -------------------------------------------------------------------------*/
30 extern symbol *returnLabel ;
31 extern symbol *entryLabel ;
33 extern int operandKey ;
45 #define IS_SYMOP(op) (op && op->type == SYMBOL)
46 #define ADDTOCHAIN(x) addSetHead(&iCodeChain,x)
48 #define LRFTYPE link *ltype = operandType(left), \
49 *rtype = operandType(right) ;
50 #define LRETYPE link *letype= getSpec(ltype) , \
51 *retype= getSpec(rtype);
52 #define LRTYPE LRFTYPE LRETYPE
53 #define IS_ITEMP(op) (IS_SYMOP(op) && op->operand.symOperand->isitmp == 1)
54 #define IS_PARM(op) (IS_SYMOP(op) && op->operand.symOperand->_isparm)
55 #define IS_ITEMPLBL(op) (IS_ITEMP(op) && op->operand.symOperand->isilbl == 1);
56 #define IS_OP_VOLATILE(op) (IS_SYMOP(op) && op->isvolatile)
57 #define IS_OP_LITERAL(op) (op && op->isLiteral)
58 #define IS_OP_GLOBAL(op) (IS_SYMOP(op) && op->isGlobal)
59 #define IS_OP_POINTER(op) (IS_SYMOP(op) && op->isPtr)
60 #define IS_OP_PARM(op) (IS_SYMOP(op) && op->isParm)
61 #define OP_SYMBOL(op) op->operand.symOperand
62 #define OP_SYM_TYPE(op) op->operand.symOperand->type
63 #define OP_SYM_ETYPE(op) op->operand.symOperand->etype
64 #define SPIL_LOC(op) op->operand.symOperand->usl.spillLoc
65 #define OP_LIVEFROM(op) op->operand.symOperand->liveFrom
66 #define OP_LIVETO(op) op->operand.symOperand->liveTo
67 #define OP_REQV(op) op->operand.symOperand->reqv
69 /* typedef for operand */
70 typedef struct operand {
71 unsigned int type: 6 ; /* type of operand */
72 unsigned int isaddr : 1; /* is an address */
73 unsigned int isvolatile: 1; /* is a volatile operand */
74 unsigned int isGlobal :1 ; /* is a global operand */
75 unsigned int isPtr :1 ; /* is assigned a pointer */
76 unsigned int isGptr :1 ; /* is a generic pointer */
77 unsigned int isParm :1 ; /* is a parameter */
78 unsigned int isLiteral:1 ; /* operand is literal */
79 unsigned int noSpilLoc:1 ; /* cannot be assigned a spil location */
84 struct symbol *symOperand ; /* operand is of type symbol */
85 struct value *valOperand ; /* operand is of type value */
86 struct link *typeOperand; /* operand is of type typechain */
89 bitVect *usesDefs; /* which definitions are used by this */
90 struct asmop *aop ; /* asm op for this operand */
93 /* definition for intermediate code */
94 #define IC_RESULT(x) x->ulrrcnd.lrr.result
95 #define IC_LEFT(x) x->ulrrcnd.lrr.left
96 #define IC_RIGHT(x) x->ulrrcnd.lrr.right
97 #define IC_COND(x) x->ulrrcnd.cnd.condition
98 #define IC_TRUE(x) x->ulrrcnd.cnd.trueLabel
99 #define IC_FALSE(x) x->ulrrcnd.cnd.falseLabel
100 #define IC_LABEL(x) x->argLabel.label
101 #define IC_ARGS(x) x->argLabel.args
102 #define IC_JTCOND(x) x->ulrrcnd.jmpTab.condition
103 #define IC_JTLABELS(x) x->ulrrcnd.jmpTab.labels
104 #define IC_INLINE(x) x->inlineAsm
108 unsigned int op ; /* operation defined */
109 int key ; /* running key for this iCode */
110 int seq ; /* sequence number within routine */
111 short depth ; /* loop depth of this iCode */
112 short level ; /* scope level */
113 short block ; /* sequential block number */
114 unsigned nosupdate:1; /* don't update spillocation with this */
115 unsigned generated:1; /* code generated for this one */
116 unsigned parmPush :1; /* parameter push Vs spill push */
117 unsigned supportRtn:1; /* will cause a call to a support routine */
118 unsigned regsSaved:1 ; /* registers have been saved */
119 unsigned bankSaved:1 ; /* register bank has been saved */
121 struct iCode *next ; /* next in chain */
122 struct iCode *prev ; /* previous in chain */
123 set *movedFrom; /* if this iCode gets moved to another block */
124 bitVect *rlive ; /* ranges that are live at this point */
125 int defKey ; /* key for the operand being defined */
126 bitVect *uses ; /* vector of key of used symbols */
127 bitVect *rUsed ; /* registers used by this instruction */
128 bitVect *rMask ; /* registers in use during this instruction */
131 operand *left ; /* left if any */
132 operand *right ; /* right if any */
133 operand *result ; /* result of this op */
137 operand *condition ; /* if this is a conditional */
138 symbol *trueLabel ; /* true for conditional */
139 symbol *falseLabel; /* false for conditional */
143 operand *condition ; /* condition for the jump */
144 set *labels ; /* ordered set of labels */
150 symbol *label ; /* for a goto statement */
154 char *inlineAsm ; /* pointer to inline assembler code */
156 int lineno ; /* file & lineno for debug information */
160 /* various functions associated to iCode */
161 typedef struct icodeFuncTable
165 void (*iCodePrint)(FILE *,iCode *,char *) ;
170 #define SKIP_IC2(x) (x->op == GOTO || \
172 x->op == FUNCTION || \
173 x->op == INLINEASM || \
174 x->op == ENDFUNCTION )
176 #define SKIP_IC1(x) (x->op == CALL || \
179 #define SKIP_IC(x) (x->op == PCALL || \
182 x->op == JUMPTABLE || \
183 x->op == RECEIVE || \
187 #define IS_CONDITIONAL(x) (x->op == EQ_OP || \
194 #define IS_TRUE_SYMOP(op) (op && IS_SYMOP(op) && !IS_ITEMP(op))
196 #define POINTER_SET(ic) ( ic && ic->op == '=' \
197 && IS_ITEMP(IC_RESULT(ic)) \
198 && IC_RESULT(ic)->isaddr )
200 #define POINTER_GET(ic) ( ic && ic->op == GET_VALUE_AT_ADDRESS \
201 && (IS_ITEMP(IC_LEFT(ic)) || IS_OP_LITERAL(IC_LEFT(ic)))\
202 && IC_LEFT(ic)->isaddr )
204 #define IS_ARITHMETIC_OP(x) (x && (x->op == '+' || \
209 #define IS_BITWISE_OP(x) (x && (x->op == BITWISEAND || \
213 #define ASSIGNMENT(ic) ( ic && ic->op == '=')
215 #define ASSIGN_SYM_TO_ITEMP(ic) (ic && ic->op == '=' && \
216 IS_TRUE_SYMOP(IC_RIGHT(ic)) && \
217 IS_ITEMP(IC_RESULT(ic)))
219 #define ASSIGN_ITEMP_TO_SYM(ic) (ic && ic->op == '=' && \
220 IS_TRUE_SYMOP(IC_RESULT(ic)) && \
221 IS_ITEMP(IC_RIGHT(ic)))
223 #define ASSIGN_ITEMP_TO_ITEMP(ic) (ic && ic->op == '=' &&\
225 IS_ITEMP(IC_RIGHT(ic)) &&\
226 IS_ITEMP(IC_RESULT(ic)))
228 #define ADD_SUBTRACT_ITEMP(ic) (ic && (ic->op == '+' || ic->op == '-') && \
229 IS_ITEMP(IC_RESULT(ic)) && \
230 ( ( IS_ITEMP(IC_LEFT(ic)) ) || ( IS_SYMOP(IC_LEFT(ic)) ) ) && \
231 IS_OP_LITERAL(IC_RIGHT(ic)))
233 #define ASSIGNMENT_TO_SELF(ic) (!POINTER_SET(ic) && !POINTER_GET(ic) && \
234 ic->op == '=' && IC_RESULT(ic)->key == IC_RIGHT(ic)->key )
236 #define SET_ISADDR(op,v) {op = operandFromOperand(op); op->isaddr = v;}
237 #define SET_RESULT_RIGHT(ic) {SET_ISADDR(IC_RIGHT(ic),0); SET_ISADDR(IC_RESULT(ic),0);}
239 #define OP_DEFS(op) op->operand.symOperand->defs
240 #define OP_USES(op) op->operand.symOperand->uses
241 /*-----------------------------------------------------------------*/
242 /* forward references for functions */
243 /*-----------------------------------------------------------------*/
244 iCode *reverseiCChain ( );
245 int isOperandVolatile (operand *,bool);
246 int isOperandGlobal (operand *);
247 void printiCChain ( iCode * , FILE *);
248 operand *ast2iCode ( ast *);
249 operand *geniCodeCast ( link *, operand *,bool);
250 operand *geniCodePtrPtrSubtract (operand *, operand *);
252 iCode *iCodeFromAst ( ast * );
253 int isiCodeEqual ( iCode *,iCode *) ;
254 int isOperandEqual ( operand *, operand *);
255 iCodeTable *getTableEntry (int );
256 int isOperandLiteral (operand *);
257 operand *operandOperation (operand *,operand *,int,link *);
258 double operandLitValue ( operand * );
259 operand *operandFromLit (float);
260 operand *operandFromOperand(operand *);
261 int isParameterToCall (value *,operand *);
262 iCode *newiCodeLabelGoto (int , symbol *);
263 symbol *newiTemp(char *);
264 symbol *newiTempLabel (char *);
265 symbol *newiTempPreheaderLabel ();
266 iCode *newiCode (int, operand *, operand *);
267 link *operandType(operand *);
268 operand *operandFromValue (value *);
269 operand *operandFromSymbol(symbol *);
270 link *aggrToPtr ( link *, bool);
271 int piCode (void *, FILE * );
272 int printOperand (operand *,FILE *);
273 void setOperandType (operand *, link *);
274 bool isOperandInFarSpace (operand *);
275 operand *opFromOpWithDU (operand *,bitVect *,bitVect *);