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ragge
1.35
1 /*      $Id: local.c,v 1.35 2006/01/01 16:17:01 ragge Exp $     */
ragge
1.1
2 /*
3  * Copyright (c) 2003 Anders Magnusson (ragge@ludd.luth.se).
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  * 3. The name of the author may not be used to endorse or promote products
15  *    derived from this software without specific prior written permission
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  */
28
29
30 # include "pass1.h"
31
32 /*      this file contains code which is dependent on the target machine */
33
34 NODE *
35 clocal(NODE *p)
36 {
37         /* this is called to do local transformations on
38            an expression tree preparitory to its being
39            written out in intermediate code.
40         */
41
42         /* the major essential job is rewriting the
43            automatic variables and arguments in terms of
44            REG and OREG nodes */
45         /* conversion ops which are not necessary are also clobbered here */
46         /* in addition, any special features (such as rewriting
47            exclusive or) are easily handled here as well */
48
49         register struct symtab *q;
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1.2
50         register NODE *r, *l;
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1.1
51         register int o;
52         register int mml;
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1.19
53         TWORD t;
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1.1
54
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1.24
55 //printf("in:\n");
56 //fwalk(p, eprint, 0);
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1.1
57         switcho = p->n_op ){
58
59         case NAME:
60                 if ((q = p->n_sp) == NULL)
61                         return p/* Nothing to care about */
62
63                 switch (q->sclass) {
64
65                 case PARAM:
66                 case AUTO:
67                         /* fake up a structure reference */
68                         r = block(REGNILNILPTR+STRTY00);
69                         r->n_lval = 0;
70                         r->n_rval = FPREG;
71                         p = stref(block(STREFrp000));
72                         break;
73
74                 case STATIC:
75                         if (q->slevel == 0)
76                                 break;
77                         p->n_lval = 0;
78                         p->n_sp = q;
79                         break;
80
81                 case REGISTER:
82                         p->n_op = REG;
83                         p->n_lval = 0;
84                         p->n_rval = q->soffset;
85                         break;
86
87                         }
88                 break;
89
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1.10
90         case FUNARG:
91                 /* Args smaller than int are given as int */
92                 if (p->n_type != CHAR && p->n_type != UCHAR && 
93                     p->n_type != SHORT && p->n_type != USHORT)
94                         break;
95                 p->n_left = block(SCONVp->n_leftNILINT0MKSUE(INT));
96                 p->n_type = INT;
97                 p->n_sue = MKSUE(INT);
98                 p->n_rval = SZINT;
99                 break;
100
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1.8
101         case CBRANCH:
102                 l = p->n_left;
103
104                 /*
105                  * Remove unneccessary conversion ops.
106                  */
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1.10
107                 if (clogop(l->n_op) && l->n_left->n_op == SCONV) {
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108                         if (coptype(l->n_op) != BITYPE)
109                                 break;
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1.8
110                         if (l->n_right->n_op == ICON) {
111                                 r = l->n_left->n_left;
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112                                 if (r->n_type >= FLOAT && r->n_type <= LDOUBLE)
113                                         break;
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114                                 /* Type must be correct */
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115                                 t = r->n_type;
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116                                 nfree(l->n_left);
117                                 l->n_left = r;
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118                                 l->n_type = t;
119                                 l->n_right->n_type = t;
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120                         }
121 #if 0
122                           else if (l->n_right->n_op == SCONV &&
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123                             l->n_left->n_type == l->n_right->n_type) {
124                                 r = l->n_left->n_left;
125                                 nfree(l->n_left);
126                                 l->n_left = r;
127                                 r = l->n_right->n_left;
128                                 nfree(l->n_right);
129                                 l->n_right = r;
130                         }
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131 #endif
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132                 }
133                 break;
134
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135         case PCONV:
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136                 ml = p->n_left->n_type;
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137                 l = p->n_left;
138                 if ((ml == CHAR || ml == UCHAR || ml == SHORT || ml == USHORT)
139                     && l->n_op != ICON)
140                         break;
141                 l->n_type = p->n_type;
142                 l->n_qual = p->n_qual;
143                 l->n_df = p->n_df;
144                 l->n_sue = p->n_sue;
145                 nfree(p);
146                 p = l;
147                 break;
148
149         case SCONV:
150                 l = p->n_left;
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151
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152                 if (p->n_type == l->n_type) {
153                         nfree(p);
154                         return l;
155                 }
156
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1.4
157                 if ((p->n_type & TMASK) == 0 && (l->n_type & TMASK) == 0 &&
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1.30
158                     btdims[p->n_type].suesize == btdims[l->n_type].suesize) {
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1.4
159                         if (p->n_type != FLOAT && p->n_type != DOUBLE &&
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160                             l->n_type != FLOAT && l->n_type != DOUBLE &&
161                             l->n_type != LDOUBLE && p->n_type != LDOUBLE) {
162                                 if (l->n_op == NAME || l->n_op == UMUL) {
163                                         l->n_type = p->n_type;
164                                         nfree(p);
165                                         return l;
166                                 }
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167                         }
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168                 }
169
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170 #if 0
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171                 if ((p->n_type == INT || p->n_type == UNSIGNED) &&
172                     ISPTR(l->n_type)) {
173                         nfree(p);
174                         return l;
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175                 }
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176 #endif
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177
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1.3
178                 o = l->n_op;
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179                 m = p->n_type;
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180
181                 if (o == ICON) {
182                         CONSZ val = l->n_lval;
183
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1.29
184                         if (!ISPTR(m)) /* Pointers don't need to be conv'd */
185                             switch (m) {
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1.1
186                         case CHAR:
187                                 l->n_lval = (char)val;
188                                 break;
189                         case UCHAR:
190                                 l->n_lval = val & 0377;
191                                 break;
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1.15
192                         case SHORT:
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1.1
193                                 l->n_lval = (short)val;
194                                 break;
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195                         case USHORT:
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1.1
196                                 l->n_lval = val & 0177777;
197                                 break;
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198                         case ULONG:
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1.1
199                         case UNSIGNED:
200                                 l->n_lval = val & 0xffffffff;
201                                 break;
202                         case ENUMTY:
203                         case MOETY:
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1.15
204                         case LONG:
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1.1
205                         case INT:
206                                 l->n_lval = (int)val;
207                                 break;
208                         case LONGLONG:
209                                 l->n_lval = (long long)val;
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210                                 break;
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211                         case ULONGLONG:
212                                 l->n_lval = val;
213                                 break;
214                         case VOID:
215                                 break;
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1.14
216                         case LDOUBLE:
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1.1
217                         case DOUBLE:
218                         case FLOAT:
219                                 l->n_op = FCON;
220                                 l->n_dcon = val;
221                                 break;
222                         default:
223                                 cerror("unknown type %d"m);
224                         }
225                         l->n_type = m;
226                         nfree(p);
227                         return l;
228                 }
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1.17
229                 if (DEUNSIGN(p->n_type) == SHORT &&
230                     DEUNSIGN(l->n_type) == SHORT) {
231                         nfree(p);
232                         p = l;
233                 }
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1.1
234                 break;
235
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1.15
236         case MOD:
237         case DIV:
238                 if (o == DIV && p->n_type != CHAR && p->n_type != SHORT)
239                         break;
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1.16
240                 if (o == MOD && p->n_type != CHAR && p->n_type != SHORT)
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1.15
241                         break;
242                 /* make it an int division by inserting conversions */
243                 p->n_left = block(SCONVp->n_leftNILINT0MKSUE(INT));
244                 p->n_right = block(SCONVp->n_rightNILINT0MKSUE(INT));
245                 p = block(SCONVpNILp->n_type0MKSUE(p->n_type));
246                 p->n_left->n_type = INT;
247                 break;
248
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1.1
249         case PMCONV:
250         case PVCONV:
251                 ifp->n_right->n_op != ICON ) cerror"bad conversion"0);
252                 nfree(p);
253                 return(buildtree(o==PMCONV?MUL:DIVp->n_leftp->n_right));
254
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1.31
255         case FORCE:
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1.32
256                 /* put return value in return reg */
257                 p->n_op = ASSIGN;
258                 p->n_right = p->n_left;
259                 p->n_left = block(REGNILNILp->n_type0MKSUE(INT));
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1.35
260                 p->n_left->n_rval = RETREG(p->n_type);
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1.31
261                 break;
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1.1
262         }
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1.24
263 //printf("ut:\n");
264 //fwalk(p, eprint, 0);
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1.1
265
266         return(p);
267 }
268
269 void
270 myp2tree(NODE *p)
271 {
272 }
273
274 /*ARGSUSED*/
275 int
276 andable(NODE *p)
277 {
278         return(1);  /* all names can have & taken on them */
279 }
280
281 /*
282  * at the end of the arguments of a ftn, set the automatic offset
283  */
284 void
285 cendarg()
286 {
287         autooff = AUTOINIT;
288 }
289
290 /*
291  * return a node, for structure references, which is suitable for
292  * being added to a pointer of type t, in order to be off bits offset
293  * into a structure
294  * t, d, and s are the type, dimension offset, and sizeoffset
295  * For pdp10, return the type-specific index number which calculation
296  * is based on its size. For example, short a[3] would return 3.
297  * Be careful about only handling first-level pointers, the following
298  * indirections must be fullword.
299  */
300 NODE *
301 offcon(OFFSZ offTWORD tunion dimfun *dstruct suedef *sue)
302 {
303         register NODE *p;
304
305         if (xdebug)
306                 printf("offcon: OFFSZ %lld type %x dim %p siz %d\n",
307                     offtdsue->suesize);
308
309         p = bcon(0);
310         p->n_lval = off/SZCHAR/* Default */
311         return(p);
312 }
313
314 /*
315  * Allocate off bits on the stack.  p is a tree that when evaluated
316  * is the multiply count for off, t is a NAME node where to write
317  * the allocated address.
318  */
319 void
320 spalloc(NODE *tNODE *pOFFSZ off)
321 {
322         NODE *sp;
323
324         if ((off % SZINT) == 0)
325                 p =  buildtree(MULpbcon(off/SZINT));
326         else if ((off % SZSHORT) == 0) {
327                 p = buildtree(MULpbcon(off/SZSHORT));
328                 p = buildtree(PLUSpbcon(1));
329                 p = buildtree(RSpbcon(1));
330         } else if ((off % SZCHAR) == 0) {
331                 p = buildtree(MULpbcon(off/SZCHAR));
332                 p = buildtree(PLUSpbcon(3));
333                 p = buildtree(RSpbcon(2));
334         } else
335                 cerror("roundsp");
336
337         /* save the address of sp */
338         sp = block(REGNILNILPTR+INTt->n_dft->n_sue);
339         sp->n_lval = 0;
340         sp->n_rval = STKREG;
341         t->n_type = sp->n_type;
342         ecomp(buildtree(ASSIGNtsp)); /* Emit! */
343
344         /* add the size to sp */
345         sp = block(REGNILNILp->n_type00);
346         sp->n_lval = 0;
347         sp->n_rval = STKREG;
348         ecomp(buildtree(PLUSEQspp));
349 }
350
351 /*
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1.21
352  * print out a constant node
353  * mat be associated with a label
354  */
355 void
356 ninval(NODE *p)
357 {
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1.24
358         struct symtab *q;
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1.23
359         TWORD t;
360
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1.21
361         p = p->n_left;
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1.23
362         t = p->n_type;
363         if (t > BTMASK)
364                 t = INT/* pointer */
365
366         switch (t) {
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1.21
367         case LONGLONG:
368         case ULONGLONG:
369                 inval(p->n_lval & 0xffffffff);
370                 inval(p->n_lval >> 32);
371                 break;
372         case INT:
373         case UNSIGNED:
374                 printf("\t.long 0x%x", (int)p->n_lval);
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1.24
375                 if ((q = p->n_sp) != NULL) {
376                         if ((q->sclass == STATIC && q->slevel > 0) ||
377                             q->sclass == ILABEL) {
378                                 printf("+" LABFMTq->soffset);
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1.21
379                         } else
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1.24
380                                 printf("+%s"exname(q->sname));
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1.21
381                 }
382                 printf("\n");
383                 break;
384         default:
385                 cerror("ninval");
386         }
387 }
388
389 /*
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1.17
390  * print out an integer.
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1.1
391  */
392 void
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1.17
393 inval(CONSZ word)
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1.1
394 {
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1.17
395         word &= 0xffffffff;
396         printf("        .long 0x%llx\n"word);
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1.1
397 }
398
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1.17
399 /* output code to initialize a floating point value */
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1.1
400 /* the proper alignment has been obtained */
401 void
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1.17
402 finval(NODE *p)
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1.1
403 {
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1.17
404         switch (p->n_type) {
405         case LDOUBLE:
406                 printf("\t.tfloat\t0t%.20Le\n"p->n_dcon);
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1.14
407                 break;
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1.17
408         case DOUBLE:
409                 printf("\t.dfloat\t0d%.20e\n", (double)p->n_dcon);
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1.14
410                 break;
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1.17
411         case FLOAT:
412                 printf("\t.ffloat\t0f%.20e\n", (float)p->n_dcon);
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1.14
413                 break;
414         }
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1.1
415 }
416
417 /* make a name look like an external name in the local machine */
418 char *
419 exname(char *p)
420 {
421         if (p == NULL)
422                 return "";
423         return p;
424 }
425
426 /*
427  * map types which are not defined on the local machine
428  */
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1.15
429 TWORD
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1.1
430 ctype(TWORD type)
431 {
432         switch (BTYPE(type)) {
433         case LONG:
434                 MODTYPE(type,INT);
435                 break;
436
437         case ULONG:
438                 MODTYPE(type,UNSIGNED);
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1.13
439
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1.1
440         }
441         return (type);
442 }
443
444 /* curid is a variable which is defined but
445  * is not initialized (and not a function );
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1.17
446  * This routine returns the storage class for an uninitialized declaration
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1.1
447  */
448 int
449 noinit()
450 {
451         return(EXTERN);
452 }
453
pj
1.30
454 void
455 calldec(NODE *pNODE *q
456 {
457 }
458
459 void
460 extdec(struct symtab *q)
461 {
462 }
463
ragge
1.1
464 /* make a common declaration for id, if reasonable */
465 void
466 commdec(struct symtab *q)
467 {
468         int off;
469
470         off = tsize(q->stypeq->sdfq->ssue);
ragge
1.8
471         off = (off+(SZCHAR-1))/SZCHAR;
ragge
1.7
472 #ifdef GCC_COMPAT
473         printf("        .comm %s,0%o\n"gcc_findname(q), off);
474 #else
ragge
1.1
475         printf("        .comm %s,0%o\n"exname(q->sname), off);
ragge
1.7
476 #endif
ragge
1.1
477 }
478
479 /* make a local common declaration for id, if reasonable */
480 void
481 lcommdec(struct symtab *q)
482 {
483         int off;
484
485         off = tsize(q->stypeq->sdfq->ssue);
ragge
1.8
486         off = (off+(SZCHAR-1))/SZCHAR;
ragge
1.1
487         if (q->slevel == 0)
ragge
1.7
488 #ifdef GCC_COMPAT
489                 printf("        .lcomm %s,0%o\n"gcc_findname(q), off);
490 #else
ragge
1.1
491                 printf("        .lcomm %s,0%o\n"exname(q->sname), off);
ragge
1.7
492 #endif
ragge
1.1
493         else
494                 printf("        .lcomm " LABFMT ",0%o\n"q->soffsetoff);
495 }
ragge
1.22
496
497 /*
498  * print a (non-prog) label.
499  */
500 void
501 deflab1(int label)
502 {
503         printf(LABFMT ":\n"label);
504 }
505
ragge
1.28
506 static char *loctbl[] = { "text""data""section .rodata""section .rodata" };
ragge
1.27
507
ragge
1.23
508 void
509 setloc1(int locc)
510 {
511         if (locc == lastloc)
512                 return;
513         lastloc = locc;
ragge
1.27
514         printf("        .%s\n"loctbl[locc]);
ragge
1.23
515 }
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Atlassian FishEye, CVS analysis. (Version:1.6.3 Build:build-336 2008-11-04) - Administration - Page generated 2014-10-01 22:26 +0200