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6f29feb1 | 1 | /* Allocate and read RTL for GNU C Compiler. |
a8efe40d | 2 | Copyright (C) 1987, 1988, 1991 Free Software Foundation, Inc. |
6f29feb1 JW |
3 | |
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU CC 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. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU CC; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
21 | #include "config.h" | |
22 | #include <ctype.h> | |
23 | #include <stdio.h> | |
24 | #include "rtl.h" | |
a19a1b5d | 25 | #include "real.h" |
6f29feb1 JW |
26 | |
27 | #include "obstack.h" | |
28 | #define obstack_chunk_alloc xmalloc | |
29 | #define obstack_chunk_free free | |
6f29feb1 JW |
30 | |
31 | /* Obstack used for allocating RTL objects. | |
32 | Between functions, this is the permanent_obstack. | |
33 | While parsing and expanding a function, this is maybepermanent_obstack | |
34 | so we can save it if it is an inline function. | |
35 | During optimization and output, this is function_obstack. */ | |
36 | ||
37 | extern struct obstack *rtl_obstack; | |
38 | ||
c166a311 CH |
39 | #if HOST_BITS_PER_WIDE_INT != HOST_BITS_PER_INT |
40 | extern long atol(); | |
41 | #endif | |
6f29feb1 JW |
42 | \f |
43 | /* Indexed by rtx code, gives number of operands for an rtx with that code. | |
44 | Does NOT include rtx header data (code and links). | |
45 | This array is initialized in init_rtl. */ | |
46 | ||
47 | int rtx_length[NUM_RTX_CODE + 1]; | |
48 | ||
49 | /* Indexed by rtx code, gives the name of that kind of rtx, as a C string. */ | |
50 | ||
51 | #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) NAME , | |
52 | ||
53 | char *rtx_name[] = { | |
54 | #include "rtl.def" /* rtl expressions are documented here */ | |
55 | }; | |
56 | ||
57 | #undef DEF_RTL_EXPR | |
58 | ||
59 | /* Indexed by machine mode, gives the name of that machine mode. | |
60 | This name does not include the letters "mode". */ | |
61 | ||
62 | #define DEF_MACHMODE(SYM, NAME, CLASS, SIZE, UNIT, WIDER) NAME, | |
63 | ||
64 | char *mode_name[(int) MAX_MACHINE_MODE] = { | |
65 | #include "machmode.def" | |
66 | ||
67 | #ifdef EXTRA_CC_MODES | |
68 | EXTRA_CC_NAMES | |
69 | #endif | |
70 | ||
71 | }; | |
72 | ||
73 | #undef DEF_MACHMODE | |
74 | ||
75 | /* Indexed by machine mode, gives the length of the mode, in bytes. | |
76 | GET_MODE_CLASS uses this. */ | |
77 | ||
78 | #define DEF_MACHMODE(SYM, NAME, CLASS, SIZE, UNIT, WIDER) CLASS, | |
79 | ||
80 | enum mode_class mode_class[(int) MAX_MACHINE_MODE] = { | |
81 | #include "machmode.def" | |
82 | }; | |
83 | ||
84 | #undef DEF_MACHMODE | |
85 | ||
86 | /* Indexed by machine mode, gives the length of the mode, in bytes. | |
87 | GET_MODE_SIZE uses this. */ | |
88 | ||
89 | #define DEF_MACHMODE(SYM, NAME, CLASS, SIZE, UNIT, WIDER) SIZE, | |
90 | ||
91 | int mode_size[(int) MAX_MACHINE_MODE] = { | |
92 | #include "machmode.def" | |
93 | }; | |
94 | ||
95 | #undef DEF_MACHMODE | |
96 | ||
97 | /* Indexed by machine mode, gives the length of the mode's subunit. | |
98 | GET_MODE_UNIT_SIZE uses this. */ | |
99 | ||
100 | #define DEF_MACHMODE(SYM, NAME, CLASS, SIZE, UNIT, WIDER) UNIT, | |
101 | ||
102 | int mode_unit_size[(int) MAX_MACHINE_MODE] = { | |
103 | #include "machmode.def" /* machine modes are documented here */ | |
104 | }; | |
105 | ||
106 | #undef DEF_MACHMODE | |
107 | ||
108 | /* Indexed by machine mode, gives next wider natural mode | |
109 | (QI -> HI -> SI -> DI, etc.) Widening multiply instructions | |
110 | use this. */ | |
111 | ||
112 | #define DEF_MACHMODE(SYM, NAME, CLASS, SIZE, UNIT, WIDER) \ | |
113 | (enum machine_mode) WIDER, | |
114 | ||
115 | enum machine_mode mode_wider_mode[(int) MAX_MACHINE_MODE] = { | |
116 | #include "machmode.def" /* machine modes are documented here */ | |
117 | }; | |
118 | ||
119 | #undef DEF_MACHMODE | |
120 | ||
4a39a918 RK |
121 | /* Indexed by mode class, gives the narrowest mode for each class. */ |
122 | ||
123 | enum machine_mode class_narrowest_mode[(int) MAX_MODE_CLASS]; | |
124 | ||
6f29feb1 JW |
125 | /* Indexed by rtx code, gives a sequence of operand-types for |
126 | rtx's of that code. The sequence is a C string in which | |
6dc42e49 | 127 | each character describes one operand. */ |
6f29feb1 JW |
128 | |
129 | char *rtx_format[] = { | |
130 | /* "*" undefined. | |
131 | can cause a warning message | |
132 | "0" field is unused (or used in a phase-dependent manner) | |
133 | prints nothing | |
134 | "i" an integer | |
135 | prints the integer | |
136 | "n" like "i", but prints entries from `note_insn_name' | |
c166a311 CH |
137 | "w" an integer of width HOST_BITS_PER_WIDE_INT |
138 | prints the integer | |
6f29feb1 JW |
139 | "s" a pointer to a string |
140 | prints the string | |
141 | "S" like "s", but optional: | |
142 | the containing rtx may end before this operand | |
143 | "e" a pointer to an rtl expression | |
144 | prints the expression | |
145 | "E" a pointer to a vector that points to a number of rtl expressions | |
146 | prints a list of the rtl expressions | |
147 | "V" like "E", but optional: | |
148 | the containing rtx may end before this operand | |
149 | "u" a pointer to another insn | |
150 | prints the uid of the insn. */ | |
151 | ||
152 | #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) FORMAT , | |
153 | #include "rtl.def" /* rtl expressions are defined here */ | |
154 | #undef DEF_RTL_EXPR | |
155 | }; | |
156 | ||
157 | /* Indexed by rtx code, gives a character representing the "class" of | |
158 | that rtx code. See rtl.def for documentation on the defined classes. */ | |
159 | ||
160 | char rtx_class[] = { | |
161 | #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) CLASS, | |
162 | #include "rtl.def" /* rtl expressions are defined here */ | |
163 | #undef DEF_RTL_EXPR | |
164 | }; | |
165 | ||
166 | /* Names for kinds of NOTEs and REG_NOTEs. */ | |
167 | ||
a31efb86 | 168 | char *note_insn_name[] = { 0 , "NOTE_INSN_DELETED", |
6f29feb1 JW |
169 | "NOTE_INSN_BLOCK_BEG", "NOTE_INSN_BLOCK_END", |
170 | "NOTE_INSN_LOOP_BEG", "NOTE_INSN_LOOP_END", | |
171 | "NOTE_INSN_FUNCTION_END", "NOTE_INSN_SETJMP", | |
bdac5f58 | 172 | "NOTE_INSN_LOOP_CONT", "NOTE_INSN_LOOP_VTOP", |
196cedd0 | 173 | "NOTE_INSN_PROLOGUE_END", "NOTE_INSN_EPILOGUE_BEG", |
a31efb86 | 174 | "NOTE_INSN_DELETED_LABEL", "NOTE_INSN_FUNCTION_BEG"}; |
6f29feb1 JW |
175 | |
176 | char *reg_note_name[] = { "", "REG_DEAD", "REG_INC", "REG_EQUIV", "REG_WAS_0", | |
177 | "REG_EQUAL", "REG_RETVAL", "REG_LIBCALL", | |
178 | "REG_NONNEG", "REG_NO_CONFLICT", "REG_UNUSED", | |
179 | "REG_CC_SETTER", "REG_CC_USER", "REG_LABEL", | |
180 | "REG_DEP_ANTI", "REG_DEP_OUTPUT" }; | |
181 | ||
182 | /* Allocate an rtx vector of N elements. | |
183 | Store the length, and initialize all elements to zero. */ | |
184 | ||
185 | rtvec | |
186 | rtvec_alloc (n) | |
187 | int n; | |
188 | { | |
189 | rtvec rt; | |
190 | int i; | |
191 | ||
192 | rt = (rtvec) obstack_alloc (rtl_obstack, | |
193 | sizeof (struct rtvec_def) | |
194 | + (( n - 1) * sizeof (rtunion))); | |
195 | ||
196 | /* clear out the vector */ | |
197 | PUT_NUM_ELEM(rt, n); | |
198 | for (i=0; i < n; i++) | |
199 | rt->elem[i].rtvec = NULL; /* @@ not portable due to rtunion */ | |
200 | ||
201 | return rt; | |
202 | } | |
203 | ||
204 | /* Allocate an rtx of code CODE. The CODE is stored in the rtx; | |
205 | all the rest is initialized to zero. */ | |
206 | ||
207 | rtx | |
208 | rtx_alloc (code) | |
209 | RTX_CODE code; | |
210 | { | |
211 | rtx rt; | |
212 | register struct obstack *ob = rtl_obstack; | |
213 | register int nelts = GET_RTX_LENGTH (code); | |
214 | register int length = sizeof (struct rtx_def) | |
215 | + (nelts - 1) * sizeof (rtunion); | |
216 | ||
217 | /* This function is called more than any other in GCC, | |
218 | so we manipulate the obstack directly. | |
219 | ||
220 | Even though rtx objects are word aligned, we may be sharing an obstack | |
221 | with tree nodes, which may have to be double-word aligned. So align | |
222 | our length to the alignment mask in the obstack. */ | |
223 | ||
224 | length = (length + ob->alignment_mask) & ~ ob->alignment_mask; | |
225 | ||
226 | if (ob->chunk_limit - ob->next_free < length) | |
227 | _obstack_newchunk (ob, length); | |
228 | rt = (rtx)ob->object_base; | |
229 | ob->next_free += length; | |
230 | ob->object_base = ob->next_free; | |
231 | ||
2151a093 RK |
232 | /* We want to clear everything up to the FLD array. Normally, this is |
233 | one int, but we don't want to assume that and it isn't very portable | |
234 | anyway; this is. */ | |
235 | ||
236 | length = (sizeof (struct rtx_def) - sizeof (rtunion) - 1) / sizeof (int); | |
237 | for (; length >= 0; length--) | |
238 | ((int *) rt)[length] = 0; | |
239 | ||
6f29feb1 JW |
240 | PUT_CODE (rt, code); |
241 | ||
242 | return rt; | |
243 | } | |
9b404774 RS |
244 | |
245 | /* Free the rtx X and all RTL allocated since X. */ | |
246 | ||
247 | void | |
248 | rtx_free (x) | |
249 | rtx x; | |
250 | { | |
251 | obstack_free (rtl_obstack, x); | |
252 | } | |
6f29feb1 JW |
253 | \f |
254 | /* Create a new copy of an rtx. | |
255 | Recursively copies the operands of the rtx, | |
256 | except for those few rtx codes that are sharable. */ | |
257 | ||
258 | rtx | |
259 | copy_rtx (orig) | |
260 | register rtx orig; | |
261 | { | |
262 | register rtx copy; | |
263 | register int i, j; | |
264 | register RTX_CODE code; | |
265 | register char *format_ptr; | |
266 | ||
267 | code = GET_CODE (orig); | |
268 | ||
269 | switch (code) | |
270 | { | |
271 | case REG: | |
272 | case QUEUED: | |
273 | case CONST_INT: | |
274 | case CONST_DOUBLE: | |
275 | case SYMBOL_REF: | |
276 | case CODE_LABEL: | |
277 | case PC: | |
278 | case CC0: | |
cf526dcc RK |
279 | case SCRATCH: |
280 | /* SCRATCH must be shared because they represent distinct values. */ | |
6f29feb1 | 281 | return orig; |
cf526dcc RK |
282 | |
283 | case CONST: | |
284 | /* CONST can be shared if it contains a SYMBOL_REF. If it contains | |
285 | a LABEL_REF, it isn't sharable. */ | |
286 | if (GET_CODE (XEXP (orig, 0)) == PLUS | |
287 | && GET_CODE (XEXP (XEXP (orig, 0), 0)) == SYMBOL_REF | |
288 | && GET_CODE (XEXP (XEXP (orig, 0), 1)) == CONST_INT) | |
289 | return orig; | |
290 | break; | |
291 | ||
cc81e625 JW |
292 | /* A MEM with a constant address is not sharable. The problem is that |
293 | the constant address may need to be reloaded. If the mem is shared, | |
294 | then reloading one copy of this mem will cause all copies to appear | |
295 | to have been reloaded. */ | |
6f29feb1 JW |
296 | } |
297 | ||
298 | copy = rtx_alloc (code); | |
299 | PUT_MODE (copy, GET_MODE (orig)); | |
300 | copy->in_struct = orig->in_struct; | |
301 | copy->volatil = orig->volatil; | |
302 | copy->unchanging = orig->unchanging; | |
303 | copy->integrated = orig->integrated; | |
304 | ||
305 | format_ptr = GET_RTX_FORMAT (GET_CODE (copy)); | |
306 | ||
307 | for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++) | |
308 | { | |
309 | switch (*format_ptr++) | |
310 | { | |
311 | case 'e': | |
312 | XEXP (copy, i) = XEXP (orig, i); | |
313 | if (XEXP (orig, i) != NULL) | |
314 | XEXP (copy, i) = copy_rtx (XEXP (orig, i)); | |
315 | break; | |
316 | ||
c166a311 | 317 | case '0': |
f1027406 RK |
318 | case 'u': |
319 | XEXP (copy, i) = XEXP (orig, i); | |
320 | break; | |
321 | ||
6f29feb1 JW |
322 | case 'E': |
323 | case 'V': | |
324 | XVEC (copy, i) = XVEC (orig, i); | |
325 | if (XVEC (orig, i) != NULL) | |
326 | { | |
327 | XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i)); | |
328 | for (j = 0; j < XVECLEN (copy, i); j++) | |
329 | XVECEXP (copy, i, j) = copy_rtx (XVECEXP (orig, i, j)); | |
330 | } | |
331 | break; | |
332 | ||
c166a311 CH |
333 | case 'w': |
334 | XWINT (copy, i) = XWINT (orig, i); | |
335 | break; | |
336 | ||
337 | case 'i': | |
6f29feb1 JW |
338 | XINT (copy, i) = XINT (orig, i); |
339 | break; | |
c166a311 CH |
340 | |
341 | case 's': | |
342 | case 'S': | |
343 | XSTR (copy, i) = XSTR (orig, i); | |
344 | break; | |
345 | ||
346 | default: | |
347 | abort (); | |
6f29feb1 JW |
348 | } |
349 | } | |
350 | return copy; | |
351 | } | |
352 | ||
353 | /* Similar to `copy_rtx' except that if MAY_SHARE is present, it is | |
354 | placed in the result directly, rather than being copied. */ | |
355 | ||
356 | rtx | |
357 | copy_most_rtx (orig, may_share) | |
358 | register rtx orig; | |
359 | register rtx may_share; | |
360 | { | |
361 | register rtx copy; | |
362 | register int i, j; | |
363 | register RTX_CODE code; | |
364 | register char *format_ptr; | |
365 | ||
366 | if (orig == may_share) | |
367 | return orig; | |
368 | ||
369 | code = GET_CODE (orig); | |
370 | ||
371 | switch (code) | |
372 | { | |
373 | case REG: | |
374 | case QUEUED: | |
375 | case CONST_INT: | |
376 | case CONST_DOUBLE: | |
377 | case SYMBOL_REF: | |
378 | case CODE_LABEL: | |
379 | case PC: | |
380 | case CC0: | |
381 | return orig; | |
382 | } | |
383 | ||
384 | copy = rtx_alloc (code); | |
385 | PUT_MODE (copy, GET_MODE (orig)); | |
386 | copy->in_struct = orig->in_struct; | |
387 | copy->volatil = orig->volatil; | |
388 | copy->unchanging = orig->unchanging; | |
389 | copy->integrated = orig->integrated; | |
390 | ||
391 | format_ptr = GET_RTX_FORMAT (GET_CODE (copy)); | |
392 | ||
393 | for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++) | |
394 | { | |
395 | switch (*format_ptr++) | |
396 | { | |
397 | case 'e': | |
398 | XEXP (copy, i) = XEXP (orig, i); | |
399 | if (XEXP (orig, i) != NULL && XEXP (orig, i) != may_share) | |
400 | XEXP (copy, i) = copy_most_rtx (XEXP (orig, i), may_share); | |
401 | break; | |
f1027406 | 402 | |
c166a311 | 403 | case '0': |
f1027406 RK |
404 | case 'u': |
405 | XEXP (copy, i) = XEXP (orig, i); | |
406 | break; | |
6f29feb1 JW |
407 | |
408 | case 'E': | |
409 | case 'V': | |
410 | XVEC (copy, i) = XVEC (orig, i); | |
411 | if (XVEC (orig, i) != NULL) | |
412 | { | |
413 | XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i)); | |
414 | for (j = 0; j < XVECLEN (copy, i); j++) | |
415 | XVECEXP (copy, i, j) | |
416 | = copy_most_rtx (XVECEXP (orig, i, j), may_share); | |
417 | } | |
418 | break; | |
419 | ||
c166a311 CH |
420 | case 'w': |
421 | XWINT (copy, i) = XWINT (orig, i); | |
422 | break; | |
423 | ||
424 | case 'n': | |
425 | case 'i': | |
6f29feb1 JW |
426 | XINT (copy, i) = XINT (orig, i); |
427 | break; | |
c166a311 CH |
428 | |
429 | case 's': | |
430 | case 'S': | |
431 | XSTR (copy, i) = XSTR (orig, i); | |
432 | break; | |
433 | ||
434 | default: | |
435 | abort (); | |
6f29feb1 JW |
436 | } |
437 | } | |
438 | return copy; | |
439 | } | |
440 | \f | |
6f29feb1 JW |
441 | /* Subroutines of read_rtx. */ |
442 | ||
443 | /* Dump code after printing a message. Used when read_rtx finds | |
444 | invalid data. */ | |
445 | ||
446 | static void | |
447 | dump_and_abort (expected_c, actual_c, infile) | |
448 | int expected_c, actual_c; | |
449 | FILE *infile; | |
450 | { | |
451 | int c, i; | |
452 | ||
453 | if (expected_c >= 0) | |
454 | fprintf (stderr, | |
455 | "Expected character %c. Found character %c.", | |
456 | expected_c, actual_c); | |
457 | fprintf (stderr, " At file position: %ld\n", ftell (infile)); | |
458 | fprintf (stderr, "Following characters are:\n\t"); | |
459 | for (i = 0; i < 200; i++) | |
460 | { | |
461 | c = getc (infile); | |
462 | if (EOF == c) break; | |
463 | putc (c, stderr); | |
464 | } | |
465 | fprintf (stderr, "Aborting.\n"); | |
466 | abort (); | |
467 | } | |
468 | ||
469 | /* Read chars from INFILE until a non-whitespace char | |
470 | and return that. Comments, both Lisp style and C style, | |
471 | are treated as whitespace. | |
472 | Tools such as genflags use this function. */ | |
473 | ||
474 | int | |
475 | read_skip_spaces (infile) | |
476 | FILE *infile; | |
477 | { | |
478 | register int c; | |
479 | while (c = getc (infile)) | |
480 | { | |
481 | if (c == ' ' || c == '\n' || c == '\t' || c == '\f') | |
482 | ; | |
483 | else if (c == ';') | |
484 | { | |
485 | while ((c = getc (infile)) && c != '\n') ; | |
486 | } | |
487 | else if (c == '/') | |
488 | { | |
489 | register int prevc; | |
490 | c = getc (infile); | |
491 | if (c != '*') | |
492 | dump_and_abort ('*', c, infile); | |
493 | ||
494 | prevc = 0; | |
495 | while (c = getc (infile)) | |
496 | { | |
497 | if (prevc == '*' && c == '/') | |
498 | break; | |
499 | prevc = c; | |
500 | } | |
501 | } | |
502 | else break; | |
503 | } | |
504 | return c; | |
505 | } | |
506 | ||
507 | /* Read an rtx code name into the buffer STR[]. | |
508 | It is terminated by any of the punctuation chars of rtx printed syntax. */ | |
509 | ||
510 | static void | |
511 | read_name (str, infile) | |
512 | char *str; | |
513 | FILE *infile; | |
514 | { | |
515 | register char *p; | |
516 | register int c; | |
517 | ||
518 | c = read_skip_spaces(infile); | |
519 | ||
520 | p = str; | |
521 | while (1) | |
522 | { | |
523 | if (c == ' ' || c == '\n' || c == '\t' || c == '\f') | |
524 | break; | |
525 | if (c == ':' || c == ')' || c == ']' || c == '"' || c == '/' | |
526 | || c == '(' || c == '[') | |
527 | { | |
528 | ungetc (c, infile); | |
529 | break; | |
530 | } | |
531 | *p++ = c; | |
532 | c = getc (infile); | |
533 | } | |
534 | if (p == str) | |
535 | { | |
536 | fprintf (stderr, "missing name or number"); | |
537 | dump_and_abort (-1, -1, infile); | |
538 | } | |
539 | ||
540 | *p = 0; | |
541 | } | |
542 | \f | |
543 | /* Read an rtx in printed representation from INFILE | |
544 | and return an actual rtx in core constructed accordingly. | |
545 | read_rtx is not used in the compiler proper, but rather in | |
546 | the utilities gen*.c that construct C code from machine descriptions. */ | |
547 | ||
548 | rtx | |
549 | read_rtx (infile) | |
550 | FILE *infile; | |
551 | { | |
552 | register int i, j, list_counter; | |
553 | RTX_CODE tmp_code; | |
554 | register char *format_ptr; | |
555 | /* tmp_char is a buffer used for reading decimal integers | |
556 | and names of rtx types and machine modes. | |
557 | Therefore, 256 must be enough. */ | |
558 | char tmp_char[256]; | |
559 | rtx return_rtx; | |
560 | register int c; | |
561 | int tmp_int; | |
c166a311 | 562 | HOST_WIDE_INT tmp_wide; |
6f29feb1 JW |
563 | |
564 | /* Linked list structure for making RTXs: */ | |
565 | struct rtx_list | |
566 | { | |
567 | struct rtx_list *next; | |
568 | rtx value; /* Value of this node... */ | |
569 | }; | |
570 | ||
571 | c = read_skip_spaces (infile); /* Should be open paren. */ | |
572 | if (c != '(') | |
573 | dump_and_abort ('(', c, infile); | |
574 | ||
575 | read_name (tmp_char, infile); | |
576 | ||
577 | tmp_code = UNKNOWN; | |
578 | ||
579 | for (i=0; i < NUM_RTX_CODE; i++) /* @@ might speed this search up */ | |
580 | { | |
581 | if (!(strcmp (tmp_char, GET_RTX_NAME (i)))) | |
582 | { | |
583 | tmp_code = (RTX_CODE) i; /* get value for name */ | |
584 | break; | |
585 | } | |
586 | } | |
587 | if (tmp_code == UNKNOWN) | |
588 | { | |
589 | fprintf (stderr, | |
590 | "Unknown rtx read in rtl.read_rtx(). Code name was %s .", | |
591 | tmp_char); | |
592 | } | |
593 | /* (NIL) stands for an expression that isn't there. */ | |
594 | if (tmp_code == NIL) | |
595 | { | |
596 | /* Discard the closeparen. */ | |
597 | while ((c = getc (infile)) && c != ')'); | |
598 | return 0; | |
599 | } | |
600 | ||
601 | return_rtx = rtx_alloc (tmp_code); /* if we end up with an insn expression | |
602 | then we free this space below. */ | |
603 | format_ptr = GET_RTX_FORMAT (GET_CODE (return_rtx)); | |
604 | ||
605 | /* If what follows is `: mode ', read it and | |
606 | store the mode in the rtx. */ | |
607 | ||
608 | i = read_skip_spaces (infile); | |
609 | if (i == ':') | |
610 | { | |
611 | register int k; | |
612 | read_name (tmp_char, infile); | |
613 | for (k = 0; k < NUM_MACHINE_MODES; k++) | |
614 | if (!strcmp (GET_MODE_NAME (k), tmp_char)) | |
615 | break; | |
616 | ||
617 | PUT_MODE (return_rtx, (enum machine_mode) k ); | |
618 | } | |
619 | else | |
620 | ungetc (i, infile); | |
621 | ||
622 | for (i = 0; i < GET_RTX_LENGTH (GET_CODE (return_rtx)); i++) | |
623 | switch (*format_ptr++) | |
624 | { | |
625 | /* 0 means a field for internal use only. | |
626 | Don't expect it to be present in the input. */ | |
627 | case '0': | |
628 | break; | |
629 | ||
630 | case 'e': | |
631 | case 'u': | |
632 | XEXP (return_rtx, i) = read_rtx (infile); | |
633 | break; | |
634 | ||
635 | case 'V': | |
636 | /* 'V' is an optional vector: if a closeparen follows, | |
637 | just store NULL for this element. */ | |
638 | c = read_skip_spaces (infile); | |
639 | ungetc (c, infile); | |
640 | if (c == ')') | |
641 | { | |
642 | XVEC (return_rtx, i) = 0; | |
643 | break; | |
644 | } | |
645 | /* Now process the vector. */ | |
646 | ||
647 | case 'E': | |
648 | { | |
649 | register struct rtx_list *next_rtx, *rtx_list_link; | |
650 | struct rtx_list *list_rtx; | |
651 | ||
652 | c = read_skip_spaces (infile); | |
653 | if (c != '[') | |
654 | dump_and_abort ('[', c, infile); | |
655 | ||
656 | /* add expressions to a list, while keeping a count */ | |
657 | next_rtx = NULL; | |
658 | list_counter = 0; | |
659 | while ((c = read_skip_spaces (infile)) && c != ']') | |
660 | { | |
661 | ungetc (c, infile); | |
662 | list_counter++; | |
663 | rtx_list_link = (struct rtx_list *) | |
664 | alloca (sizeof (struct rtx_list)); | |
665 | rtx_list_link->value = read_rtx (infile); | |
666 | if (next_rtx == 0) | |
667 | list_rtx = rtx_list_link; | |
668 | else | |
669 | next_rtx->next = rtx_list_link; | |
670 | next_rtx = rtx_list_link; | |
671 | rtx_list_link->next = 0; | |
672 | } | |
673 | /* get vector length and allocate it */ | |
674 | XVEC (return_rtx, i) = (list_counter | |
c166a311 | 675 | ? rtvec_alloc (list_counter) : NULL_RTVEC); |
6f29feb1 JW |
676 | if (list_counter > 0) |
677 | { | |
678 | next_rtx = list_rtx; | |
679 | for (j = 0; j < list_counter; j++, | |
680 | next_rtx = next_rtx->next) | |
681 | XVECEXP (return_rtx, i, j) = next_rtx->value; | |
682 | } | |
683 | /* close bracket gotten */ | |
684 | } | |
685 | break; | |
686 | ||
687 | case 'S': | |
688 | /* 'S' is an optional string: if a closeparen follows, | |
689 | just store NULL for this element. */ | |
690 | c = read_skip_spaces (infile); | |
691 | ungetc (c, infile); | |
692 | if (c == ')') | |
693 | { | |
694 | XSTR (return_rtx, i) = 0; | |
695 | break; | |
696 | } | |
697 | ||
698 | case 's': | |
699 | { | |
700 | int saw_paren = 0; | |
701 | register char *stringbuf; | |
702 | int stringbufsize; | |
703 | ||
704 | c = read_skip_spaces (infile); | |
705 | if (c == '(') | |
706 | { | |
707 | saw_paren = 1; | |
708 | c = read_skip_spaces (infile); | |
709 | } | |
710 | if (c != '"') | |
711 | dump_and_abort ('"', c, infile); | |
6f29feb1 JW |
712 | |
713 | while (1) | |
714 | { | |
2dcb563f RS |
715 | c = getc (infile); /* Read the string */ |
716 | if (c == '\\') | |
6f29feb1 | 717 | { |
2dcb563f | 718 | c = getc (infile); /* Read the string */ |
6f29feb1 JW |
719 | /* \; makes stuff for a C string constant containing |
720 | newline and tab. */ | |
2dcb563f | 721 | if (c == ';') |
81dd58a6 RS |
722 | { |
723 | obstack_grow (rtl_obstack, "\\n\\t", 4); | |
724 | continue; | |
725 | } | |
6f29feb1 | 726 | } |
2dcb563f | 727 | else if (c == '"') |
6f29feb1 | 728 | break; |
2dcb563f RS |
729 | |
730 | obstack_1grow (rtl_obstack, c); | |
6f29feb1 JW |
731 | } |
732 | ||
2dcb563f RS |
733 | obstack_1grow (rtl_obstack, 0); |
734 | stringbuf = (char *) obstack_finish (rtl_obstack); | |
6f29feb1 JW |
735 | |
736 | if (saw_paren) | |
737 | { | |
738 | c = read_skip_spaces (infile); | |
739 | if (c != ')') | |
740 | dump_and_abort (')', c, infile); | |
741 | } | |
742 | XSTR (return_rtx, i) = stringbuf; | |
743 | } | |
744 | break; | |
745 | ||
c166a311 CH |
746 | case 'w': |
747 | read_name (tmp_char, infile); | |
748 | #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT | |
749 | tmp_wide = atoi (tmp_char); | |
750 | #else | |
751 | tmp_wide = atol (tmp_char); | |
752 | #endif | |
753 | XWINT (return_rtx, i) = tmp_wide; | |
754 | break; | |
755 | ||
6f29feb1 JW |
756 | case 'i': |
757 | case 'n': | |
758 | read_name (tmp_char, infile); | |
759 | tmp_int = atoi (tmp_char); | |
760 | XINT (return_rtx, i) = tmp_int; | |
761 | break; | |
762 | ||
763 | default: | |
764 | fprintf (stderr, | |
765 | "switch format wrong in rtl.read_rtx(). format was: %c.\n", | |
766 | format_ptr[-1]); | |
767 | fprintf (stderr, "\tfile position: %ld\n", ftell (infile)); | |
768 | abort (); | |
769 | } | |
770 | ||
771 | c = read_skip_spaces (infile); | |
772 | if (c != ')') | |
773 | dump_and_abort (')', c, infile); | |
774 | ||
775 | return return_rtx; | |
776 | } | |
777 | \f | |
778 | /* This is called once per compilation, before any rtx's are constructed. | |
4a39a918 RK |
779 | It initializes the vector `rtx_length', the extra CC modes, if any, |
780 | and computes certain commonly-used modes. */ | |
6f29feb1 JW |
781 | |
782 | void | |
783 | init_rtl () | |
784 | { | |
4a39a918 RK |
785 | int min_class_size[(int) MAX_MODE_CLASS]; |
786 | enum machine_mode mode; | |
6f29feb1 JW |
787 | int i; |
788 | ||
789 | for (i = 0; i < NUM_RTX_CODE; i++) | |
790 | rtx_length[i] = strlen (rtx_format[i]); | |
791 | ||
792 | /* Make CONST_DOUBLE bigger, if real values are bigger than | |
793 | it normally expects to have room for. | |
794 | Note that REAL_VALUE_TYPE is not defined by default, | |
795 | since tree.h is not included. But the default dfn as `double' | |
796 | would do no harm. */ | |
797 | #ifdef REAL_VALUE_TYPE | |
798 | i = sizeof (REAL_VALUE_TYPE) / sizeof (rtunion) + 2; | |
799 | if (rtx_length[(int) CONST_DOUBLE] < i) | |
800 | { | |
801 | char *s = (char *) xmalloc (i + 1); | |
802 | rtx_length[(int) CONST_DOUBLE] = i; | |
803 | rtx_format[(int) CONST_DOUBLE] = s; | |
804 | *s++ = 'e'; | |
805 | *s++ = '0'; | |
806 | /* Set the GET_RTX_FORMAT of CONST_DOUBLE to a string | |
262555e2 RS |
807 | of as many `w's as we now have elements. Subtract two from |
808 | the size to account for the 'e' and the '0'. */ | |
809 | for (i = 2; i < rtx_length[(int) CONST_DOUBLE]; i++) | |
c166a311 | 810 | *s++ = 'w'; |
6f29feb1 JW |
811 | *s++ = 0; |
812 | } | |
813 | #endif | |
814 | ||
815 | #ifdef EXTRA_CC_MODES | |
816 | for (i = (int) CCmode + 1; i < (int) MAX_MACHINE_MODE; i++) | |
817 | { | |
818 | mode_class[i] = MODE_CC; | |
819 | mode_size[i] = mode_size[(int) CCmode]; | |
820 | mode_unit_size[i] = mode_unit_size[(int) CCmode]; | |
821 | mode_wider_mode[i - 1] = (enum machine_mode) i; | |
822 | mode_wider_mode[i] = VOIDmode; | |
823 | } | |
824 | #endif | |
4a39a918 | 825 | |
d3d63026 | 826 | /* Find the narrowest mode for each class. */ |
4a39a918 RK |
827 | |
828 | for (i = 0; i < (int) MAX_MODE_CLASS; i++) | |
829 | min_class_size[i] = 1000; | |
830 | ||
831 | for (mode = VOIDmode; (int) mode < (int) MAX_MACHINE_MODE; | |
832 | mode = (enum machine_mode) ((int) mode + 1)) | |
833 | { | |
834 | if (GET_MODE_SIZE (mode) < min_class_size[(int) GET_MODE_CLASS (mode)]) | |
835 | { | |
836 | class_narrowest_mode[(int) GET_MODE_CLASS (mode)] = mode; | |
837 | min_class_size[(int) GET_MODE_CLASS (mode)] = GET_MODE_SIZE (mode); | |
838 | } | |
4a39a918 | 839 | } |
6f29feb1 | 840 | } |
e8aa1193 TW |
841 | \f |
842 | #ifdef memset | |
843 | gcc_memset (dest, value, len) | |
844 | char *dest; | |
845 | int value; | |
846 | int len; | |
847 | { | |
848 | while (len-- > 0) | |
849 | *dest++ = value; | |
850 | } | |
851 | #endif /* memset */ |