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;
51 #define IS_SYMOP(op) (op && op->type == SYMBOL)
52 #define ADDTOCHAIN(x) addSetHead(&iCodeChain,x)
54 #define LRFTYPE sym_link *ltype = operandType(left), \
55 *rtype = operandType(right) ;
56 #define LRETYPE sym_link *letype= getSpec(ltype) , \
57 *retype= getSpec(rtype);
58 #define LRTYPE LRFTYPE LRETYPE
59 #define IS_ITEMP(op) (IS_SYMOP(op) && op->operand.symOperand->isitmp == 1)
60 #define IS_PARM(op) (IS_SYMOP(op) && op->operand.symOperand->_isparm)
61 #define IS_ITEMPLBL(op) (IS_ITEMP(op) && op->operand.symOperand->isilbl == 1);
62 #define IS_OP_VOLATILE(op) (IS_SYMOP(op) && op->isvolatile)
63 #define IS_OP_LITERAL(op) (op && op->isLiteral)
64 #define IS_OP_GLOBAL(op) (IS_SYMOP(op) && op->isGlobal)
65 #define IS_OP_POINTER(op) (IS_SYMOP(op) && op->isPtr)
66 #define IS_OP_PARM(op) (IS_SYMOP(op) && op->isParm)
67 #define OP_SYMBOL(op) op->operand.symOperand
68 #define OP_SYM_TYPE(op) op->operand.symOperand->type
69 #define OP_SYM_ETYPE(op) op->operand.symOperand->etype
70 #define SPIL_LOC(op) op->operand.symOperand->usl.spillLoc
71 #define OP_LIVEFROM(op) op->operand.symOperand->liveFrom
72 #define OP_LIVETO(op) op->operand.symOperand->liveTo
73 #define OP_REQV(op) op->operand.symOperand->reqv
74 #define OP_ISLIVE_FCALL(op) (IS_ITEMP(op) && OP_SYMBOL(op)->isLiveFcall)
76 /* typedef for operand */
77 typedef struct operand
79 OPTYPE type; /* type of operand */
80 unsigned int isaddr:1; /* is an address */
81 unsigned int isvolatile:1; /* is a volatile operand */
82 unsigned int isGlobal:1; /* is a global operand */
83 unsigned int isPtr:1; /* is assigned a pointer */
84 unsigned int isGptr:1; /* is a generic pointer */
85 unsigned int isParm:1; /* is a parameter */
86 unsigned int isLiteral:1; /* operand is literal */
91 struct symbol *symOperand; /* operand is of type symbol */
92 struct value *valOperand; /* operand is of type value */
93 struct sym_link *typeOperand; /* operand is of type typechain */
97 bitVect *usesDefs; /* which definitions are used by this */
98 struct asmop *aop; /* asm op for this operand */
102 /* definition for intermediate code */
103 #define IC_RESULT(x) (x)->ulrrcnd.lrr.result
104 #define IC_LEFT(x) (x)->ulrrcnd.lrr.left
105 #define IC_RIGHT(x) (x)->ulrrcnd.lrr.right
106 #define IC_COND(x) (x)->ulrrcnd.cnd.condition
107 #define IC_TRUE(x) (x)->ulrrcnd.cnd.trueLabel
108 #define IC_FALSE(x) (x)->ulrrcnd.cnd.falseLabel
109 #define IC_LABEL(x) (x)->argLabel.label
110 #define IC_ARGS(x) (x)->argLabel.args
111 #define IC_JTCOND(x) (x)->ulrrcnd.jmpTab.condition
112 #define IC_JTLABELS(x) (x)->ulrrcnd.jmpTab.labels
113 #define IC_INLINE(x) (x)->inlineAsm
114 #define IC_ARRAYILIST(x) (x)->arrayInitList
118 unsigned int op; /* operation defined */
119 int key; /* running key for this iCode */
120 int seq; /* sequence number within routine */
121 short depth; /* loop depth of this iCode */
122 short level; /* scope level */
123 short block; /* sequential block number */
124 unsigned nosupdate:1; /* don't update spillocation with this */
125 unsigned generated:1; /* code generated for this one */
126 unsigned parmPush:1; /* parameter push Vs spill push */
127 unsigned supportRtn:1; /* will cause a call to a support routine */
128 unsigned regsSaved:1; /* registers have been saved */
129 unsigned bankSaved:1; /* register bank has been saved */
131 struct iCode *next; /* next in chain */
132 struct iCode *prev; /* previous in chain */
133 set *movedFrom; /* if this iCode gets moved to another block */
134 bitVect *rlive; /* ranges that are live at this point */
135 int defKey; /* key for the operand being defined */
136 bitVect *uses; /* vector of key of used symbols */
137 bitVect *rUsed; /* registers used by this instruction */
138 bitVect *rMask; /* registers in use during this instruction */
143 operand *left; /* left if any */
144 operand *right; /* right if any */
145 operand *result; /* result of this op */
151 operand *condition; /* if this is a conditional */
152 symbol *trueLabel; /* true for conditional */
153 symbol *falseLabel; /* false for conditional */
159 operand *condition; /* condition for the jump */
160 set *labels; /* ordered set of labels */
169 symbol *label; /* for a goto statement */
174 char *inlineAsm; /* pointer to inline assembler code */
175 literalList *arrayInitList; /* point to array initializer list. */
177 int lineno; /* file & lineno for debug information */
180 int parmBytes; /* if call/pcall, count of parameter bytes
185 /* various functions associated to iCode */
186 typedef struct icodeFuncTable
190 void (*iCodePrint) (FILE *, iCode *, char *);
191 iCode *(*iCodeCopy) (iCode *);
196 #define SKIP_IC2(x) (x->op == GOTO || \
198 x->op == FUNCTION || \
199 x->op == INLINEASM || \
200 x->op == ENDFUNCTION )
202 #define SKIP_IC1(x) (x->op == CALL || \
205 #define SKIP_IC(x) (x->op == PCALL || \
208 x->op == JUMPTABLE || \
209 x->op == RECEIVE || \
210 x->op == ARRAYINIT || \
214 #define IS_CONDITIONAL(x) (x->op == EQ_OP || \
221 #define IS_TRUE_SYMOP(op) (op && IS_SYMOP(op) && !IS_ITEMP(op))
223 #define POINTER_SET(ic) ( ic && ic->op == '=' \
224 && IS_ITEMP(IC_RESULT(ic)) \
225 && IC_RESULT(ic)->isaddr )
227 #define POINTER_GET(ic) ( ic && ic->op == GET_VALUE_AT_ADDRESS \
228 && (IS_ITEMP(IC_LEFT(ic)) || IS_OP_LITERAL(IC_LEFT(ic)))\
229 && IC_LEFT(ic)->isaddr )
231 #define IS_ARITHMETIC_OP(x) (x && (x->op == '+' || \
236 #define IS_BITWISE_OP(x) (x && (x->op == BITWISEAND || \
240 #define ASSIGNMENT(ic) ( ic && ic->op == '=')
242 #define ASSIGN_SYM_TO_ITEMP(ic) (ic && ic->op == '=' && \
243 IS_TRUE_SYMOP(IC_RIGHT(ic)) && \
244 IS_ITEMP(IC_RESULT(ic)))
246 #define ASSIGN_ITEMP_TO_SYM(ic) (ic && ic->op == '=' && \
247 IS_TRUE_SYMOP(IC_RESULT(ic)) && \
248 IS_ITEMP(IC_RIGHT(ic)))
250 #define ASSIGN_ITEMP_TO_ITEMP(ic) (ic && ic->op == '=' &&\
252 IS_ITEMP(IC_RIGHT(ic)) &&\
253 IS_ITEMP(IC_RESULT(ic)))
255 #define ADD_SUBTRACT_ITEMP(ic) (ic && (ic->op == '+' || ic->op == '-') && \
256 IS_ITEMP(IC_RESULT(ic)) && \
257 ( ( IS_ITEMP(IC_LEFT(ic)) ) || ( IS_SYMOP(IC_LEFT(ic)) ) ) && \
258 IS_OP_LITERAL(IC_RIGHT(ic)))
260 #define ASSIGNMENT_TO_SELF(ic) (!POINTER_SET(ic) && !POINTER_GET(ic) && \
261 ic->op == '=' && IC_RESULT(ic)->key == IC_RIGHT(ic)->key )
263 #define SET_ISADDR(op,v) {op = operandFromOperand(op); op->isaddr = v;}
264 #define SET_RESULT_RIGHT(ic) {SET_ISADDR(IC_RIGHT(ic),0); SET_ISADDR(IC_RESULT(ic),0);}
266 #define OP_DEFS(op) op->operand.symOperand->defs
267 #define OP_USES(op) op->operand.symOperand->uses
268 /*-----------------------------------------------------------------*/
269 /* forward references for functions */
270 /*-----------------------------------------------------------------*/
271 iCode *reverseiCChain ();
272 bool isOperandOnStack (operand *);
273 int isOperandVolatile (operand *, bool);
274 int isOperandGlobal (operand *);
275 void printiCChain (iCode *, FILE *);
276 operand *ast2iCode (ast *,int);
277 operand *geniCodeCast (sym_link *, operand *, bool);
278 operand *geniCodePtrPtrSubtract (operand *, operand *);
280 iCode *iCodeFromAst (ast *);
281 int isiCodeEqual (iCode *, iCode *);
282 int isOperandEqual (operand *, operand *);
283 iCodeTable *getTableEntry (int);
284 int isOperandLiteral (operand *);
285 operand *operandOperation (operand *, operand *, int, sym_link *);
286 double operandLitValue (operand *);
287 operand *operandFromLit (double);
288 operand *operandFromOperand (operand *);
289 int isParameterToCall (value *, operand *);
290 iCode *newiCodeLabelGoto (int, symbol *);
291 symbol *newiTemp (char *);
292 symbol *newiTempLabel (char *);
293 symbol *newiTempPreheaderLabel ();
294 iCode *newiCode (int, operand *, operand *);
295 sym_link *operandType (operand *);
296 operand *operandFromValue (value *);
297 operand *operandFromSymbol (symbol *);
298 sym_link *aggrToPtr (sym_link *, bool);
299 int piCode (void *, FILE *);
300 int printOperand (operand *, FILE *);
301 void setOperandType (operand *, sym_link *);
302 bool isOperandInFarSpace (operand *);
303 operand *opFromOpWithDU (operand *, bitVect *, bitVect *);
304 iCode *copyiCode (iCode *);
305 operand *newiTempFromOp (operand *);
306 /*-----------------------------------------------------------------*/
307 /* declaration of exported variables */
308 /*-----------------------------------------------------------------*/
309 extern char *filename;