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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" | |
25 | ||
26 | #include "obstack.h" | |
27 | #define obstack_chunk_alloc xmalloc | |
28 | #define obstack_chunk_free free | |
6f29feb1 JW |
29 | |
30 | /* Obstack used for allocating RTL objects. | |
31 | Between functions, this is the permanent_obstack. | |
32 | While parsing and expanding a function, this is maybepermanent_obstack | |
33 | so we can save it if it is an inline function. | |
34 | During optimization and output, this is function_obstack. */ | |
35 | ||
36 | extern struct obstack *rtl_obstack; | |
37 | ||
c166a311 CH |
38 | #if HOST_BITS_PER_WIDE_INT != HOST_BITS_PER_INT |
39 | extern long atol(); | |
40 | #endif | |
6f29feb1 JW |
41 | \f |
42 | /* Indexed by rtx code, gives number of operands for an rtx with that code. | |
43 | Does NOT include rtx header data (code and links). | |
44 | This array is initialized in init_rtl. */ | |
45 | ||
46 | int rtx_length[NUM_RTX_CODE + 1]; | |
47 | ||
48 | /* Indexed by rtx code, gives the name of that kind of rtx, as a C string. */ | |
49 | ||
50 | #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) NAME , | |
51 | ||
52 | char *rtx_name[] = { | |
53 | #include "rtl.def" /* rtl expressions are documented here */ | |
54 | }; | |
55 | ||
56 | #undef DEF_RTL_EXPR | |
57 | ||
58 | /* Indexed by machine mode, gives the name of that machine mode. | |
59 | This name does not include the letters "mode". */ | |
60 | ||
61 | #define DEF_MACHMODE(SYM, NAME, CLASS, SIZE, UNIT, WIDER) NAME, | |
62 | ||
63 | char *mode_name[(int) MAX_MACHINE_MODE] = { | |
64 | #include "machmode.def" | |
65 | ||
66 | #ifdef EXTRA_CC_MODES | |
67 | EXTRA_CC_NAMES | |
68 | #endif | |
69 | ||
70 | }; | |
71 | ||
72 | #undef DEF_MACHMODE | |
73 | ||
74 | /* Indexed by machine mode, gives the length of the mode, in bytes. | |
75 | GET_MODE_CLASS uses this. */ | |
76 | ||
77 | #define DEF_MACHMODE(SYM, NAME, CLASS, SIZE, UNIT, WIDER) CLASS, | |
78 | ||
79 | enum mode_class mode_class[(int) MAX_MACHINE_MODE] = { | |
80 | #include "machmode.def" | |
81 | }; | |
82 | ||
83 | #undef DEF_MACHMODE | |
84 | ||
85 | /* Indexed by machine mode, gives the length of the mode, in bytes. | |
86 | GET_MODE_SIZE uses this. */ | |
87 | ||
88 | #define DEF_MACHMODE(SYM, NAME, CLASS, SIZE, UNIT, WIDER) SIZE, | |
89 | ||
90 | int mode_size[(int) MAX_MACHINE_MODE] = { | |
91 | #include "machmode.def" | |
92 | }; | |
93 | ||
94 | #undef DEF_MACHMODE | |
95 | ||
96 | /* Indexed by machine mode, gives the length of the mode's subunit. | |
97 | GET_MODE_UNIT_SIZE uses this. */ | |
98 | ||
99 | #define DEF_MACHMODE(SYM, NAME, CLASS, SIZE, UNIT, WIDER) UNIT, | |
100 | ||
101 | int mode_unit_size[(int) MAX_MACHINE_MODE] = { | |
102 | #include "machmode.def" /* machine modes are documented here */ | |
103 | }; | |
104 | ||
105 | #undef DEF_MACHMODE | |
106 | ||
107 | /* Indexed by machine mode, gives next wider natural mode | |
108 | (QI -> HI -> SI -> DI, etc.) Widening multiply instructions | |
109 | use this. */ | |
110 | ||
111 | #define DEF_MACHMODE(SYM, NAME, CLASS, SIZE, UNIT, WIDER) \ | |
112 | (enum machine_mode) WIDER, | |
113 | ||
114 | enum machine_mode mode_wider_mode[(int) MAX_MACHINE_MODE] = { | |
115 | #include "machmode.def" /* machine modes are documented here */ | |
116 | }; | |
117 | ||
118 | #undef DEF_MACHMODE | |
119 | ||
4a39a918 RK |
120 | /* Indexed by mode class, gives the narrowest mode for each class. */ |
121 | ||
122 | enum machine_mode class_narrowest_mode[(int) MAX_MODE_CLASS]; | |
123 | ||
124 | /* Commonly used modes. */ | |
125 | ||
126 | enum machine_mode byte_mode; /* Mode whose width is BITS_PER_UNIT */ | |
127 | enum machine_mode word_mode; /* Mode whose width is BITS_PER_WORD */ | |
128 | ||
6f29feb1 JW |
129 | /* Indexed by rtx code, gives a sequence of operand-types for |
130 | rtx's of that code. The sequence is a C string in which | |
6dc42e49 | 131 | each character describes one operand. */ |
6f29feb1 JW |
132 | |
133 | char *rtx_format[] = { | |
134 | /* "*" undefined. | |
135 | can cause a warning message | |
136 | "0" field is unused (or used in a phase-dependent manner) | |
137 | prints nothing | |
138 | "i" an integer | |
139 | prints the integer | |
140 | "n" like "i", but prints entries from `note_insn_name' | |
c166a311 CH |
141 | "w" an integer of width HOST_BITS_PER_WIDE_INT |
142 | prints the integer | |
6f29feb1 JW |
143 | "s" a pointer to a string |
144 | prints the string | |
145 | "S" like "s", but optional: | |
146 | the containing rtx may end before this operand | |
147 | "e" a pointer to an rtl expression | |
148 | prints the expression | |
149 | "E" a pointer to a vector that points to a number of rtl expressions | |
150 | prints a list of the rtl expressions | |
151 | "V" like "E", but optional: | |
152 | the containing rtx may end before this operand | |
153 | "u" a pointer to another insn | |
154 | prints the uid of the insn. */ | |
155 | ||
156 | #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) FORMAT , | |
157 | #include "rtl.def" /* rtl expressions are defined here */ | |
158 | #undef DEF_RTL_EXPR | |
159 | }; | |
160 | ||
161 | /* Indexed by rtx code, gives a character representing the "class" of | |
162 | that rtx code. See rtl.def for documentation on the defined classes. */ | |
163 | ||
164 | char rtx_class[] = { | |
165 | #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) CLASS, | |
166 | #include "rtl.def" /* rtl expressions are defined here */ | |
167 | #undef DEF_RTL_EXPR | |
168 | }; | |
169 | ||
170 | /* Names for kinds of NOTEs and REG_NOTEs. */ | |
171 | ||
172 | char *note_insn_name[] = { "NOTE_INSN_FUNCTION_BEG", "NOTE_INSN_DELETED", | |
173 | "NOTE_INSN_BLOCK_BEG", "NOTE_INSN_BLOCK_END", | |
174 | "NOTE_INSN_LOOP_BEG", "NOTE_INSN_LOOP_END", | |
175 | "NOTE_INSN_FUNCTION_END", "NOTE_INSN_SETJMP", | |
bdac5f58 | 176 | "NOTE_INSN_LOOP_CONT", "NOTE_INSN_LOOP_VTOP", |
196cedd0 | 177 | "NOTE_INSN_PROLOGUE_END", "NOTE_INSN_EPILOGUE_BEG", |
8cfef35a | 178 | "NOTE_INSN_DELETED_LABEL"}; |
6f29feb1 JW |
179 | |
180 | char *reg_note_name[] = { "", "REG_DEAD", "REG_INC", "REG_EQUIV", "REG_WAS_0", | |
181 | "REG_EQUAL", "REG_RETVAL", "REG_LIBCALL", | |
182 | "REG_NONNEG", "REG_NO_CONFLICT", "REG_UNUSED", | |
183 | "REG_CC_SETTER", "REG_CC_USER", "REG_LABEL", | |
184 | "REG_DEP_ANTI", "REG_DEP_OUTPUT" }; | |
185 | ||
186 | /* Allocate an rtx vector of N elements. | |
187 | Store the length, and initialize all elements to zero. */ | |
188 | ||
189 | rtvec | |
190 | rtvec_alloc (n) | |
191 | int n; | |
192 | { | |
193 | rtvec rt; | |
194 | int i; | |
195 | ||
196 | rt = (rtvec) obstack_alloc (rtl_obstack, | |
197 | sizeof (struct rtvec_def) | |
198 | + (( n - 1) * sizeof (rtunion))); | |
199 | ||
200 | /* clear out the vector */ | |
201 | PUT_NUM_ELEM(rt, n); | |
202 | for (i=0; i < n; i++) | |
203 | rt->elem[i].rtvec = NULL; /* @@ not portable due to rtunion */ | |
204 | ||
205 | return rt; | |
206 | } | |
207 | ||
208 | /* Allocate an rtx of code CODE. The CODE is stored in the rtx; | |
209 | all the rest is initialized to zero. */ | |
210 | ||
211 | rtx | |
212 | rtx_alloc (code) | |
213 | RTX_CODE code; | |
214 | { | |
215 | rtx rt; | |
216 | register struct obstack *ob = rtl_obstack; | |
217 | register int nelts = GET_RTX_LENGTH (code); | |
218 | register int length = sizeof (struct rtx_def) | |
219 | + (nelts - 1) * sizeof (rtunion); | |
220 | ||
221 | /* This function is called more than any other in GCC, | |
222 | so we manipulate the obstack directly. | |
223 | ||
224 | Even though rtx objects are word aligned, we may be sharing an obstack | |
225 | with tree nodes, which may have to be double-word aligned. So align | |
226 | our length to the alignment mask in the obstack. */ | |
227 | ||
228 | length = (length + ob->alignment_mask) & ~ ob->alignment_mask; | |
229 | ||
230 | if (ob->chunk_limit - ob->next_free < length) | |
231 | _obstack_newchunk (ob, length); | |
232 | rt = (rtx)ob->object_base; | |
233 | ob->next_free += length; | |
234 | ob->object_base = ob->next_free; | |
235 | ||
2151a093 RK |
236 | /* We want to clear everything up to the FLD array. Normally, this is |
237 | one int, but we don't want to assume that and it isn't very portable | |
238 | anyway; this is. */ | |
239 | ||
240 | length = (sizeof (struct rtx_def) - sizeof (rtunion) - 1) / sizeof (int); | |
241 | for (; length >= 0; length--) | |
242 | ((int *) rt)[length] = 0; | |
243 | ||
6f29feb1 JW |
244 | PUT_CODE (rt, code); |
245 | ||
246 | return rt; | |
247 | } | |
248 | \f | |
249 | /* Create a new copy of an rtx. | |
250 | Recursively copies the operands of the rtx, | |
251 | except for those few rtx codes that are sharable. */ | |
252 | ||
253 | rtx | |
254 | copy_rtx (orig) | |
255 | register rtx orig; | |
256 | { | |
257 | register rtx copy; | |
258 | register int i, j; | |
259 | register RTX_CODE code; | |
260 | register char *format_ptr; | |
261 | ||
262 | code = GET_CODE (orig); | |
263 | ||
264 | switch (code) | |
265 | { | |
266 | case REG: | |
267 | case QUEUED: | |
268 | case CONST_INT: | |
269 | case CONST_DOUBLE: | |
270 | case SYMBOL_REF: | |
271 | case CODE_LABEL: | |
272 | case PC: | |
273 | case CC0: | |
cf526dcc RK |
274 | case SCRATCH: |
275 | /* SCRATCH must be shared because they represent distinct values. */ | |
6f29feb1 | 276 | return orig; |
cf526dcc RK |
277 | |
278 | case CONST: | |
279 | /* CONST can be shared if it contains a SYMBOL_REF. If it contains | |
280 | a LABEL_REF, it isn't sharable. */ | |
281 | if (GET_CODE (XEXP (orig, 0)) == PLUS | |
282 | && GET_CODE (XEXP (XEXP (orig, 0), 0)) == SYMBOL_REF | |
283 | && GET_CODE (XEXP (XEXP (orig, 0), 1)) == CONST_INT) | |
284 | return orig; | |
285 | break; | |
286 | ||
287 | case MEM: | |
288 | if (CONSTANT_ADDRESS_P (XEXP (orig, 0))) | |
289 | return orig; | |
290 | break; | |
6f29feb1 JW |
291 | } |
292 | ||
293 | copy = rtx_alloc (code); | |
294 | PUT_MODE (copy, GET_MODE (orig)); | |
295 | copy->in_struct = orig->in_struct; | |
296 | copy->volatil = orig->volatil; | |
297 | copy->unchanging = orig->unchanging; | |
298 | copy->integrated = orig->integrated; | |
299 | ||
300 | format_ptr = GET_RTX_FORMAT (GET_CODE (copy)); | |
301 | ||
302 | for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++) | |
303 | { | |
304 | switch (*format_ptr++) | |
305 | { | |
306 | case 'e': | |
307 | XEXP (copy, i) = XEXP (orig, i); | |
308 | if (XEXP (orig, i) != NULL) | |
309 | XEXP (copy, i) = copy_rtx (XEXP (orig, i)); | |
310 | break; | |
311 | ||
c166a311 | 312 | case '0': |
f1027406 RK |
313 | case 'u': |
314 | XEXP (copy, i) = XEXP (orig, i); | |
315 | break; | |
316 | ||
6f29feb1 JW |
317 | case 'E': |
318 | case 'V': | |
319 | XVEC (copy, i) = XVEC (orig, i); | |
320 | if (XVEC (orig, i) != NULL) | |
321 | { | |
322 | XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i)); | |
323 | for (j = 0; j < XVECLEN (copy, i); j++) | |
324 | XVECEXP (copy, i, j) = copy_rtx (XVECEXP (orig, i, j)); | |
325 | } | |
326 | break; | |
327 | ||
c166a311 CH |
328 | case 'w': |
329 | XWINT (copy, i) = XWINT (orig, i); | |
330 | break; | |
331 | ||
332 | case 'i': | |
6f29feb1 JW |
333 | XINT (copy, i) = XINT (orig, i); |
334 | break; | |
c166a311 CH |
335 | |
336 | case 's': | |
337 | case 'S': | |
338 | XSTR (copy, i) = XSTR (orig, i); | |
339 | break; | |
340 | ||
341 | default: | |
342 | abort (); | |
6f29feb1 JW |
343 | } |
344 | } | |
345 | return copy; | |
346 | } | |
347 | ||
348 | /* Similar to `copy_rtx' except that if MAY_SHARE is present, it is | |
349 | placed in the result directly, rather than being copied. */ | |
350 | ||
351 | rtx | |
352 | copy_most_rtx (orig, may_share) | |
353 | register rtx orig; | |
354 | register rtx may_share; | |
355 | { | |
356 | register rtx copy; | |
357 | register int i, j; | |
358 | register RTX_CODE code; | |
359 | register char *format_ptr; | |
360 | ||
361 | if (orig == may_share) | |
362 | return orig; | |
363 | ||
364 | code = GET_CODE (orig); | |
365 | ||
366 | switch (code) | |
367 | { | |
368 | case REG: | |
369 | case QUEUED: | |
370 | case CONST_INT: | |
371 | case CONST_DOUBLE: | |
372 | case SYMBOL_REF: | |
373 | case CODE_LABEL: | |
374 | case PC: | |
375 | case CC0: | |
376 | return orig; | |
377 | } | |
378 | ||
379 | copy = rtx_alloc (code); | |
380 | PUT_MODE (copy, GET_MODE (orig)); | |
381 | copy->in_struct = orig->in_struct; | |
382 | copy->volatil = orig->volatil; | |
383 | copy->unchanging = orig->unchanging; | |
384 | copy->integrated = orig->integrated; | |
385 | ||
386 | format_ptr = GET_RTX_FORMAT (GET_CODE (copy)); | |
387 | ||
388 | for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++) | |
389 | { | |
390 | switch (*format_ptr++) | |
391 | { | |
392 | case 'e': | |
393 | XEXP (copy, i) = XEXP (orig, i); | |
394 | if (XEXP (orig, i) != NULL && XEXP (orig, i) != may_share) | |
395 | XEXP (copy, i) = copy_most_rtx (XEXP (orig, i), may_share); | |
396 | break; | |
f1027406 | 397 | |
c166a311 | 398 | case '0': |
f1027406 RK |
399 | case 'u': |
400 | XEXP (copy, i) = XEXP (orig, i); | |
401 | break; | |
6f29feb1 JW |
402 | |
403 | case 'E': | |
404 | case 'V': | |
405 | XVEC (copy, i) = XVEC (orig, i); | |
406 | if (XVEC (orig, i) != NULL) | |
407 | { | |
408 | XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i)); | |
409 | for (j = 0; j < XVECLEN (copy, i); j++) | |
410 | XVECEXP (copy, i, j) | |
411 | = copy_most_rtx (XVECEXP (orig, i, j), may_share); | |
412 | } | |
413 | break; | |
414 | ||
c166a311 CH |
415 | case 'w': |
416 | XWINT (copy, i) = XWINT (orig, i); | |
417 | break; | |
418 | ||
419 | case 'n': | |
420 | case 'i': | |
6f29feb1 JW |
421 | XINT (copy, i) = XINT (orig, i); |
422 | break; | |
c166a311 CH |
423 | |
424 | case 's': | |
425 | case 'S': | |
426 | XSTR (copy, i) = XSTR (orig, i); | |
427 | break; | |
428 | ||
429 | default: | |
430 | abort (); | |
6f29feb1 JW |
431 | } |
432 | } | |
433 | return copy; | |
434 | } | |
435 | \f | |
6f29feb1 JW |
436 | /* Subroutines of read_rtx. */ |
437 | ||
438 | /* Dump code after printing a message. Used when read_rtx finds | |
439 | invalid data. */ | |
440 | ||
441 | static void | |
442 | dump_and_abort (expected_c, actual_c, infile) | |
443 | int expected_c, actual_c; | |
444 | FILE *infile; | |
445 | { | |
446 | int c, i; | |
447 | ||
448 | if (expected_c >= 0) | |
449 | fprintf (stderr, | |
450 | "Expected character %c. Found character %c.", | |
451 | expected_c, actual_c); | |
452 | fprintf (stderr, " At file position: %ld\n", ftell (infile)); | |
453 | fprintf (stderr, "Following characters are:\n\t"); | |
454 | for (i = 0; i < 200; i++) | |
455 | { | |
456 | c = getc (infile); | |
457 | if (EOF == c) break; | |
458 | putc (c, stderr); | |
459 | } | |
460 | fprintf (stderr, "Aborting.\n"); | |
461 | abort (); | |
462 | } | |
463 | ||
464 | /* Read chars from INFILE until a non-whitespace char | |
465 | and return that. Comments, both Lisp style and C style, | |
466 | are treated as whitespace. | |
467 | Tools such as genflags use this function. */ | |
468 | ||
469 | int | |
470 | read_skip_spaces (infile) | |
471 | FILE *infile; | |
472 | { | |
473 | register int c; | |
474 | while (c = getc (infile)) | |
475 | { | |
476 | if (c == ' ' || c == '\n' || c == '\t' || c == '\f') | |
477 | ; | |
478 | else if (c == ';') | |
479 | { | |
480 | while ((c = getc (infile)) && c != '\n') ; | |
481 | } | |
482 | else if (c == '/') | |
483 | { | |
484 | register int prevc; | |
485 | c = getc (infile); | |
486 | if (c != '*') | |
487 | dump_and_abort ('*', c, infile); | |
488 | ||
489 | prevc = 0; | |
490 | while (c = getc (infile)) | |
491 | { | |
492 | if (prevc == '*' && c == '/') | |
493 | break; | |
494 | prevc = c; | |
495 | } | |
496 | } | |
497 | else break; | |
498 | } | |
499 | return c; | |
500 | } | |
501 | ||
502 | /* Read an rtx code name into the buffer STR[]. | |
503 | It is terminated by any of the punctuation chars of rtx printed syntax. */ | |
504 | ||
505 | static void | |
506 | read_name (str, infile) | |
507 | char *str; | |
508 | FILE *infile; | |
509 | { | |
510 | register char *p; | |
511 | register int c; | |
512 | ||
513 | c = read_skip_spaces(infile); | |
514 | ||
515 | p = str; | |
516 | while (1) | |
517 | { | |
518 | if (c == ' ' || c == '\n' || c == '\t' || c == '\f') | |
519 | break; | |
520 | if (c == ':' || c == ')' || c == ']' || c == '"' || c == '/' | |
521 | || c == '(' || c == '[') | |
522 | { | |
523 | ungetc (c, infile); | |
524 | break; | |
525 | } | |
526 | *p++ = c; | |
527 | c = getc (infile); | |
528 | } | |
529 | if (p == str) | |
530 | { | |
531 | fprintf (stderr, "missing name or number"); | |
532 | dump_and_abort (-1, -1, infile); | |
533 | } | |
534 | ||
535 | *p = 0; | |
536 | } | |
537 | \f | |
538 | /* Read an rtx in printed representation from INFILE | |
539 | and return an actual rtx in core constructed accordingly. | |
540 | read_rtx is not used in the compiler proper, but rather in | |
541 | the utilities gen*.c that construct C code from machine descriptions. */ | |
542 | ||
543 | rtx | |
544 | read_rtx (infile) | |
545 | FILE *infile; | |
546 | { | |
547 | register int i, j, list_counter; | |
548 | RTX_CODE tmp_code; | |
549 | register char *format_ptr; | |
550 | /* tmp_char is a buffer used for reading decimal integers | |
551 | and names of rtx types and machine modes. | |
552 | Therefore, 256 must be enough. */ | |
553 | char tmp_char[256]; | |
554 | rtx return_rtx; | |
555 | register int c; | |
556 | int tmp_int; | |
c166a311 | 557 | HOST_WIDE_INT tmp_wide; |
6f29feb1 JW |
558 | |
559 | /* Linked list structure for making RTXs: */ | |
560 | struct rtx_list | |
561 | { | |
562 | struct rtx_list *next; | |
563 | rtx value; /* Value of this node... */ | |
564 | }; | |
565 | ||
566 | c = read_skip_spaces (infile); /* Should be open paren. */ | |
567 | if (c != '(') | |
568 | dump_and_abort ('(', c, infile); | |
569 | ||
570 | read_name (tmp_char, infile); | |
571 | ||
572 | tmp_code = UNKNOWN; | |
573 | ||
574 | for (i=0; i < NUM_RTX_CODE; i++) /* @@ might speed this search up */ | |
575 | { | |
576 | if (!(strcmp (tmp_char, GET_RTX_NAME (i)))) | |
577 | { | |
578 | tmp_code = (RTX_CODE) i; /* get value for name */ | |
579 | break; | |
580 | } | |
581 | } | |
582 | if (tmp_code == UNKNOWN) | |
583 | { | |
584 | fprintf (stderr, | |
585 | "Unknown rtx read in rtl.read_rtx(). Code name was %s .", | |
586 | tmp_char); | |
587 | } | |
588 | /* (NIL) stands for an expression that isn't there. */ | |
589 | if (tmp_code == NIL) | |
590 | { | |
591 | /* Discard the closeparen. */ | |
592 | while ((c = getc (infile)) && c != ')'); | |
593 | return 0; | |
594 | } | |
595 | ||
596 | return_rtx = rtx_alloc (tmp_code); /* if we end up with an insn expression | |
597 | then we free this space below. */ | |
598 | format_ptr = GET_RTX_FORMAT (GET_CODE (return_rtx)); | |
599 | ||
600 | /* If what follows is `: mode ', read it and | |
601 | store the mode in the rtx. */ | |
602 | ||
603 | i = read_skip_spaces (infile); | |
604 | if (i == ':') | |
605 | { | |
606 | register int k; | |
607 | read_name (tmp_char, infile); | |
608 | for (k = 0; k < NUM_MACHINE_MODES; k++) | |
609 | if (!strcmp (GET_MODE_NAME (k), tmp_char)) | |
610 | break; | |
611 | ||
612 | PUT_MODE (return_rtx, (enum machine_mode) k ); | |
613 | } | |
614 | else | |
615 | ungetc (i, infile); | |
616 | ||
617 | for (i = 0; i < GET_RTX_LENGTH (GET_CODE (return_rtx)); i++) | |
618 | switch (*format_ptr++) | |
619 | { | |
620 | /* 0 means a field for internal use only. | |
621 | Don't expect it to be present in the input. */ | |
622 | case '0': | |
623 | break; | |
624 | ||
625 | case 'e': | |
626 | case 'u': | |
627 | XEXP (return_rtx, i) = read_rtx (infile); | |
628 | break; | |
629 | ||
630 | case 'V': | |
631 | /* 'V' is an optional vector: if a closeparen follows, | |
632 | just store NULL for this element. */ | |
633 | c = read_skip_spaces (infile); | |
634 | ungetc (c, infile); | |
635 | if (c == ')') | |
636 | { | |
637 | XVEC (return_rtx, i) = 0; | |
638 | break; | |
639 | } | |
640 | /* Now process the vector. */ | |
641 | ||
642 | case 'E': | |
643 | { | |
644 | register struct rtx_list *next_rtx, *rtx_list_link; | |
645 | struct rtx_list *list_rtx; | |
646 | ||
647 | c = read_skip_spaces (infile); | |
648 | if (c != '[') | |
649 | dump_and_abort ('[', c, infile); | |
650 | ||
651 | /* add expressions to a list, while keeping a count */ | |
652 | next_rtx = NULL; | |
653 | list_counter = 0; | |
654 | while ((c = read_skip_spaces (infile)) && c != ']') | |
655 | { | |
656 | ungetc (c, infile); | |
657 | list_counter++; | |
658 | rtx_list_link = (struct rtx_list *) | |
659 | alloca (sizeof (struct rtx_list)); | |
660 | rtx_list_link->value = read_rtx (infile); | |
661 | if (next_rtx == 0) | |
662 | list_rtx = rtx_list_link; | |
663 | else | |
664 | next_rtx->next = rtx_list_link; | |
665 | next_rtx = rtx_list_link; | |
666 | rtx_list_link->next = 0; | |
667 | } | |
668 | /* get vector length and allocate it */ | |
669 | XVEC (return_rtx, i) = (list_counter | |
c166a311 | 670 | ? rtvec_alloc (list_counter) : NULL_RTVEC); |
6f29feb1 JW |
671 | if (list_counter > 0) |
672 | { | |
673 | next_rtx = list_rtx; | |
674 | for (j = 0; j < list_counter; j++, | |
675 | next_rtx = next_rtx->next) | |
676 | XVECEXP (return_rtx, i, j) = next_rtx->value; | |
677 | } | |
678 | /* close bracket gotten */ | |
679 | } | |
680 | break; | |
681 | ||
682 | case 'S': | |
683 | /* 'S' is an optional string: if a closeparen follows, | |
684 | just store NULL for this element. */ | |
685 | c = read_skip_spaces (infile); | |
686 | ungetc (c, infile); | |
687 | if (c == ')') | |
688 | { | |
689 | XSTR (return_rtx, i) = 0; | |
690 | break; | |
691 | } | |
692 | ||
693 | case 's': | |
694 | { | |
695 | int saw_paren = 0; | |
696 | register char *stringbuf; | |
697 | int stringbufsize; | |
698 | ||
699 | c = read_skip_spaces (infile); | |
700 | if (c == '(') | |
701 | { | |
702 | saw_paren = 1; | |
703 | c = read_skip_spaces (infile); | |
704 | } | |
705 | if (c != '"') | |
706 | dump_and_abort ('"', c, infile); | |
6f29feb1 JW |
707 | |
708 | while (1) | |
709 | { | |
2dcb563f RS |
710 | c = getc (infile); /* Read the string */ |
711 | if (c == '\\') | |
6f29feb1 | 712 | { |
2dcb563f | 713 | c = getc (infile); /* Read the string */ |
6f29feb1 JW |
714 | /* \; makes stuff for a C string constant containing |
715 | newline and tab. */ | |
2dcb563f | 716 | if (c == ';') |
81dd58a6 RS |
717 | { |
718 | obstack_grow (rtl_obstack, "\\n\\t", 4); | |
719 | continue; | |
720 | } | |
6f29feb1 | 721 | } |
2dcb563f | 722 | else if (c == '"') |
6f29feb1 | 723 | break; |
2dcb563f RS |
724 | |
725 | obstack_1grow (rtl_obstack, c); | |
6f29feb1 JW |
726 | } |
727 | ||
2dcb563f RS |
728 | obstack_1grow (rtl_obstack, 0); |
729 | stringbuf = (char *) obstack_finish (rtl_obstack); | |
6f29feb1 JW |
730 | |
731 | if (saw_paren) | |
732 | { | |
733 | c = read_skip_spaces (infile); | |
734 | if (c != ')') | |
735 | dump_and_abort (')', c, infile); | |
736 | } | |
737 | XSTR (return_rtx, i) = stringbuf; | |
738 | } | |
739 | break; | |
740 | ||
c166a311 CH |
741 | case 'w': |
742 | read_name (tmp_char, infile); | |
743 | #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT | |
744 | tmp_wide = atoi (tmp_char); | |
745 | #else | |
746 | tmp_wide = atol (tmp_char); | |
747 | #endif | |
748 | XWINT (return_rtx, i) = tmp_wide; | |
749 | break; | |
750 | ||
6f29feb1 JW |
751 | case 'i': |
752 | case 'n': | |
753 | read_name (tmp_char, infile); | |
754 | tmp_int = atoi (tmp_char); | |
755 | XINT (return_rtx, i) = tmp_int; | |
756 | break; | |
757 | ||
758 | default: | |
759 | fprintf (stderr, | |
760 | "switch format wrong in rtl.read_rtx(). format was: %c.\n", | |
761 | format_ptr[-1]); | |
762 | fprintf (stderr, "\tfile position: %ld\n", ftell (infile)); | |
763 | abort (); | |
764 | } | |
765 | ||
766 | c = read_skip_spaces (infile); | |
767 | if (c != ')') | |
768 | dump_and_abort (')', c, infile); | |
769 | ||
770 | return return_rtx; | |
771 | } | |
772 | \f | |
773 | /* This is called once per compilation, before any rtx's are constructed. | |
4a39a918 RK |
774 | It initializes the vector `rtx_length', the extra CC modes, if any, |
775 | and computes certain commonly-used modes. */ | |
6f29feb1 JW |
776 | |
777 | void | |
778 | init_rtl () | |
779 | { | |
4a39a918 RK |
780 | int min_class_size[(int) MAX_MODE_CLASS]; |
781 | enum machine_mode mode; | |
6f29feb1 JW |
782 | int i; |
783 | ||
784 | for (i = 0; i < NUM_RTX_CODE; i++) | |
785 | rtx_length[i] = strlen (rtx_format[i]); | |
786 | ||
787 | /* Make CONST_DOUBLE bigger, if real values are bigger than | |
788 | it normally expects to have room for. | |
789 | Note that REAL_VALUE_TYPE is not defined by default, | |
790 | since tree.h is not included. But the default dfn as `double' | |
791 | would do no harm. */ | |
792 | #ifdef REAL_VALUE_TYPE | |
793 | i = sizeof (REAL_VALUE_TYPE) / sizeof (rtunion) + 2; | |
794 | if (rtx_length[(int) CONST_DOUBLE] < i) | |
795 | { | |
796 | char *s = (char *) xmalloc (i + 1); | |
797 | rtx_length[(int) CONST_DOUBLE] = i; | |
798 | rtx_format[(int) CONST_DOUBLE] = s; | |
799 | *s++ = 'e'; | |
800 | *s++ = '0'; | |
801 | /* Set the GET_RTX_FORMAT of CONST_DOUBLE to a string | |
802 | of as many `i's as we now have elements. */ | |
803 | for (i = 0; i < rtx_length[(int) CONST_DOUBLE]; i++) | |
c166a311 | 804 | *s++ = 'w'; |
6f29feb1 JW |
805 | *s++ = 0; |
806 | } | |
807 | #endif | |
808 | ||
809 | #ifdef EXTRA_CC_MODES | |
810 | for (i = (int) CCmode + 1; i < (int) MAX_MACHINE_MODE; i++) | |
811 | { | |
812 | mode_class[i] = MODE_CC; | |
813 | mode_size[i] = mode_size[(int) CCmode]; | |
814 | mode_unit_size[i] = mode_unit_size[(int) CCmode]; | |
815 | mode_wider_mode[i - 1] = (enum machine_mode) i; | |
816 | mode_wider_mode[i] = VOIDmode; | |
817 | } | |
818 | #endif | |
4a39a918 RK |
819 | |
820 | /* Find the narrowest mode for each class and compute the word and byte | |
821 | modes. */ | |
822 | ||
823 | for (i = 0; i < (int) MAX_MODE_CLASS; i++) | |
824 | min_class_size[i] = 1000; | |
825 | ||
b96806f6 RS |
826 | byte_mode = VOIDmode; |
827 | word_mode = VOIDmode; | |
828 | ||
4a39a918 RK |
829 | for (mode = VOIDmode; (int) mode < (int) MAX_MACHINE_MODE; |
830 | mode = (enum machine_mode) ((int) mode + 1)) | |
831 | { | |
832 | if (GET_MODE_SIZE (mode) < min_class_size[(int) GET_MODE_CLASS (mode)]) | |
833 | { | |
834 | class_narrowest_mode[(int) GET_MODE_CLASS (mode)] = mode; | |
835 | min_class_size[(int) GET_MODE_CLASS (mode)] = GET_MODE_SIZE (mode); | |
836 | } | |
837 | if (GET_MODE_CLASS (mode) == MODE_INT | |
b96806f6 RS |
838 | && GET_MODE_BITSIZE (mode) == BITS_PER_UNIT |
839 | && byte_mode == VOIDmode) | |
4a39a918 RK |
840 | byte_mode = mode; |
841 | ||
842 | if (GET_MODE_CLASS (mode) == MODE_INT | |
b96806f6 RS |
843 | && GET_MODE_BITSIZE (mode) == BITS_PER_WORD |
844 | && word_mode == VOIDmode) | |
4a39a918 RK |
845 | word_mode = mode; |
846 | } | |
6f29feb1 | 847 | } |
e8aa1193 TW |
848 | \f |
849 | #ifdef memset | |
850 | gcc_memset (dest, value, len) | |
851 | char *dest; | |
852 | int value; | |
853 | int len; | |
854 | { | |
855 | while (len-- > 0) | |
856 | *dest++ = value; | |
857 | } | |
858 | #endif /* memset */ |