Mercurial > hg > CbC > CbC_gcc
annotate gcc/genextract.c @ 131:84e7813d76e9
gcc-8.2
author | mir3636 |
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date | Thu, 25 Oct 2018 07:37:49 +0900 |
parents | 04ced10e8804 |
children | 1830386684a0 |
rev | line source |
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0 | 1 /* Generate code from machine description to extract operands from insn as rtl. |
131 | 2 Copyright (C) 1987-2018 Free Software Foundation, Inc. |
0 | 3 |
4 This file is part of GCC. | |
5 | |
6 GCC is free software; you can redistribute it and/or modify it under | |
7 the terms of the GNU General Public License as published by the Free | |
8 Software Foundation; either version 3, or (at your option) any later | |
9 version. | |
10 | |
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 for more details. | |
15 | |
16 You should have received a copy of the GNU General Public License | |
17 along with GCC; see the file COPYING3. If not see | |
18 <http://www.gnu.org/licenses/>. */ | |
19 | |
20 | |
21 #include "bconfig.h" | |
22 #include "system.h" | |
23 #include "coretypes.h" | |
24 #include "tm.h" | |
25 #include "rtl.h" | |
26 #include "errors.h" | |
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27 #include "read-md.h" |
0 | 28 #include "gensupport.h" |
29 | |
30 /* This structure contains all the information needed to describe one | |
31 set of extractions methods. Each method may be used by more than | |
32 one pattern if the operands are in the same place. | |
33 | |
34 The string for each operand describes that path to the operand and | |
35 contains `0' through `9' when going into an expression and `a' through | |
131 | 36 `z' then 'A' through to 'Z' when going into a vector. We assume here that |
37 only the first operand of an rtl expression is a vector. genrecog.c makes | |
38 the same assumption (and uses the same representation) and it is currently | |
39 true. */ | |
0 | 40 |
41 typedef char *locstr; | |
42 | |
43 struct extraction | |
44 { | |
45 unsigned int op_count; | |
46 unsigned int dup_count; | |
47 locstr *oplocs; | |
48 locstr *duplocs; | |
49 int *dupnums; | |
50 struct code_ptr *insns; | |
51 struct extraction *next; | |
52 }; | |
53 | |
54 /* Holds a single insn code that uses an extraction method. */ | |
55 struct code_ptr | |
56 { | |
57 int insn_code; | |
58 struct code_ptr *next; | |
59 }; | |
60 | |
61 /* All extractions needed for this machine description. */ | |
62 static struct extraction *extractions; | |
63 | |
64 /* All insn codes for old-style peepholes. */ | |
65 static struct code_ptr *peepholes; | |
66 | |
67 /* This structure is used by gen_insn and walk_rtx to accumulate the | |
68 data that will be used to produce an extractions structure. */ | |
69 | |
70 | |
71 struct accum_extract | |
72 { | |
111 | 73 accum_extract () : oplocs (10), duplocs (10), dupnums (10), pathstr (20) {} |
74 | |
75 auto_vec<locstr> oplocs; | |
76 auto_vec<locstr> duplocs; | |
77 auto_vec<int> dupnums; | |
78 auto_vec<char> pathstr; | |
0 | 79 }; |
80 | |
81 /* Forward declarations. */ | |
111 | 82 static void walk_rtx (md_rtx_info *, rtx, struct accum_extract *); |
0 | 83 |
131 | 84 #define UPPER_OFFSET ('A' - ('z' - 'a' + 1)) |
85 | |
86 /* Convert integer OPERAND into a character - either into [a-zA-Z] for vector | |
87 operands or [0-9] for integer operands - and push onto the end of the path | |
88 in ACC. */ | |
89 static void | |
90 push_pathstr_operand (int operand, bool is_vector, | |
91 struct accum_extract *acc) | |
92 { | |
93 if (is_vector && 'a' + operand > 'z') | |
94 acc->pathstr.safe_push (operand + UPPER_OFFSET); | |
95 else if (is_vector) | |
96 acc->pathstr.safe_push (operand + 'a'); | |
97 else | |
98 acc->pathstr.safe_push (operand + '0'); | |
99 } | |
100 | |
0 | 101 static void |
111 | 102 gen_insn (md_rtx_info *info) |
0 | 103 { |
104 int i; | |
105 unsigned int op_count, dup_count, j; | |
106 struct extraction *p; | |
107 struct code_ptr *link; | |
108 struct accum_extract acc; | |
109 | |
110 /* Walk the insn's pattern, remembering at all times the path | |
111 down to the walking point. */ | |
112 | |
111 | 113 rtx insn = info->def; |
0 | 114 if (XVECLEN (insn, 1) == 1) |
111 | 115 walk_rtx (info, XVECEXP (insn, 1, 0), &acc); |
0 | 116 else |
117 for (i = XVECLEN (insn, 1) - 1; i >= 0; i--) | |
118 { | |
131 | 119 push_pathstr_operand (i, true, &acc); |
111 | 120 walk_rtx (info, XVECEXP (insn, 1, i), &acc); |
121 acc.pathstr.pop (); | |
0 | 122 } |
123 | |
124 link = XNEW (struct code_ptr); | |
111 | 125 link->insn_code = info->index; |
0 | 126 |
127 /* See if we find something that already had this extraction method. */ | |
128 | |
111 | 129 op_count = acc.oplocs.length (); |
130 dup_count = acc.duplocs.length (); | |
131 gcc_assert (dup_count == acc.dupnums.length ()); | |
0 | 132 |
133 for (p = extractions; p; p = p->next) | |
134 { | |
135 if (p->op_count != op_count || p->dup_count != dup_count) | |
136 continue; | |
137 | |
138 for (j = 0; j < op_count; j++) | |
139 { | |
140 char *a = p->oplocs[j]; | |
111 | 141 char *b = acc.oplocs[j]; |
0 | 142 if (a != b && (!a || !b || strcmp (a, b))) |
143 break; | |
144 } | |
145 | |
146 if (j != op_count) | |
147 continue; | |
148 | |
149 for (j = 0; j < dup_count; j++) | |
111 | 150 if (p->dupnums[j] != acc.dupnums[j] |
151 || strcmp (p->duplocs[j], acc.duplocs[j])) | |
0 | 152 break; |
153 | |
154 if (j != dup_count) | |
155 continue; | |
156 | |
157 /* This extraction is the same as ours. Just link us in. */ | |
158 link->next = p->insns; | |
159 p->insns = link; | |
111 | 160 return; |
0 | 161 } |
162 | |
163 /* Otherwise, make a new extraction method. We stash the arrays | |
164 after the extraction structure in memory. */ | |
165 | |
166 p = XNEWVAR (struct extraction, sizeof (struct extraction) | |
167 + op_count*sizeof (char *) | |
168 + dup_count*sizeof (char *) | |
169 + dup_count*sizeof (int)); | |
170 p->op_count = op_count; | |
171 p->dup_count = dup_count; | |
172 p->next = extractions; | |
173 extractions = p; | |
174 p->insns = link; | |
175 link->next = 0; | |
176 | |
177 p->oplocs = (char **)((char *)p + sizeof (struct extraction)); | |
178 p->duplocs = p->oplocs + op_count; | |
179 p->dupnums = (int *)(p->duplocs + dup_count); | |
180 | |
111 | 181 memcpy (p->oplocs, acc.oplocs.address (), op_count * sizeof (locstr)); |
182 memcpy (p->duplocs, acc.duplocs.address (), dup_count * sizeof (locstr)); | |
183 memcpy (p->dupnums, acc.dupnums.address (), dup_count * sizeof (int)); | |
0 | 184 } |
185 | |
111 | 186 /* Helper subroutine of walk_rtx: given a vec<locstr>, an index, and a |
0 | 187 string, insert the string at the index, which should either already |
188 exist and be NULL, or not yet exist within the vector. In the latter | |
111 | 189 case the vector is enlarged as appropriate. INFO describes the |
190 containing define_* expression. */ | |
0 | 191 static void |
111 | 192 VEC_safe_set_locstr (md_rtx_info *info, vec<locstr> *vp, |
193 unsigned int ix, char *str) | |
0 | 194 { |
111 | 195 if (ix < (*vp).length ()) |
0 | 196 { |
111 | 197 if ((*vp)[ix]) |
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198 { |
111 | 199 message_at (info->loc, "repeated operand number %d", ix); |
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200 have_error = 1; |
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201 } |
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202 else |
111 | 203 (*vp)[ix] = str; |
0 | 204 } |
205 else | |
206 { | |
111 | 207 while (ix > (*vp).length ()) |
208 vp->safe_push (NULL); | |
209 vp->safe_push (str); | |
0 | 210 } |
211 } | |
212 | |
111 | 213 /* Another helper subroutine of walk_rtx: given a vec<char>, convert it |
0 | 214 to a NUL-terminated string in malloc memory. */ |
215 static char * | |
111 | 216 VEC_char_to_string (vec<char> v) |
0 | 217 { |
111 | 218 size_t n = v.length (); |
0 | 219 char *s = XNEWVEC (char, n + 1); |
111 | 220 memcpy (s, v.address (), n); |
0 | 221 s[n] = '\0'; |
222 return s; | |
223 } | |
224 | |
225 static void | |
111 | 226 walk_rtx (md_rtx_info *info, rtx x, struct accum_extract *acc) |
0 | 227 { |
228 RTX_CODE code; | |
131 | 229 int i, len; |
0 | 230 const char *fmt; |
231 | |
232 if (x == 0) | |
233 return; | |
234 | |
235 code = GET_CODE (x); | |
236 switch (code) | |
237 { | |
238 case PC: | |
239 case CC0: | |
240 case CONST_INT: | |
241 case SYMBOL_REF: | |
242 return; | |
243 | |
244 case MATCH_OPERAND: | |
245 case MATCH_SCRATCH: | |
111 | 246 VEC_safe_set_locstr (info, &acc->oplocs, XINT (x, 0), |
0 | 247 VEC_char_to_string (acc->pathstr)); |
248 break; | |
249 | |
250 case MATCH_OPERATOR: | |
251 case MATCH_PARALLEL: | |
111 | 252 VEC_safe_set_locstr (info, &acc->oplocs, XINT (x, 0), |
0 | 253 VEC_char_to_string (acc->pathstr)); |
254 | |
255 for (i = XVECLEN (x, 2) - 1; i >= 0; i--) | |
256 { | |
131 | 257 push_pathstr_operand (i, code != MATCH_OPERATOR, acc); |
111 | 258 walk_rtx (info, XVECEXP (x, 2, i), acc); |
259 acc->pathstr.pop (); | |
0 | 260 } |
261 return; | |
262 | |
263 case MATCH_DUP: | |
264 case MATCH_PAR_DUP: | |
265 case MATCH_OP_DUP: | |
111 | 266 acc->duplocs.safe_push (VEC_char_to_string (acc->pathstr)); |
267 acc->dupnums.safe_push (XINT (x, 0)); | |
0 | 268 |
269 if (code == MATCH_DUP) | |
270 break; | |
271 | |
272 for (i = XVECLEN (x, 1) - 1; i >= 0; i--) | |
273 { | |
131 | 274 push_pathstr_operand (i, code != MATCH_OP_DUP, acc); |
111 | 275 walk_rtx (info, XVECEXP (x, 1, i), acc); |
276 acc->pathstr.pop (); | |
0 | 277 } |
278 return; | |
279 | |
280 default: | |
281 break; | |
282 } | |
283 | |
284 fmt = GET_RTX_FORMAT (code); | |
285 len = GET_RTX_LENGTH (code); | |
286 for (i = 0; i < len; i++) | |
287 { | |
288 if (fmt[i] == 'e' || fmt[i] == 'u') | |
289 { | |
131 | 290 push_pathstr_operand (i, false, acc); |
111 | 291 walk_rtx (info, XEXP (x, i), acc); |
292 acc->pathstr.pop (); | |
0 | 293 } |
294 else if (fmt[i] == 'E') | |
295 { | |
296 int j; | |
297 for (j = XVECLEN (x, i) - 1; j >= 0; j--) | |
298 { | |
131 | 299 push_pathstr_operand (j, true, acc); |
111 | 300 walk_rtx (info, XVECEXP (x, i, j), acc); |
301 acc->pathstr.pop (); | |
0 | 302 } |
303 } | |
304 } | |
305 } | |
306 | |
307 /* Given a PATH, representing a path down the instruction's | |
308 pattern from the root to a certain point, output code to | |
309 evaluate to the rtx at that point. */ | |
310 | |
311 static void | |
312 print_path (const char *path) | |
313 { | |
314 int len = strlen (path); | |
315 int i; | |
316 | |
317 if (len == 0) | |
318 { | |
319 /* Don't emit "pat", since we may try to take the address of it, | |
320 which isn't what is intended. */ | |
321 fputs ("PATTERN (insn)", stdout); | |
322 return; | |
323 } | |
324 | |
325 /* We first write out the operations (XEXP or XVECEXP) in reverse | |
326 order, then write "pat", then the indices in forward order. */ | |
327 | |
328 for (i = len - 1; i >= 0 ; i--) | |
329 { | |
131 | 330 if (ISLOWER (path[i]) || ISUPPER (path[i])) |
0 | 331 fputs ("XVECEXP (", stdout); |
332 else if (ISDIGIT (path[i])) | |
333 fputs ("XEXP (", stdout); | |
334 else | |
335 gcc_unreachable (); | |
336 } | |
337 | |
338 fputs ("pat", stdout); | |
339 | |
340 for (i = 0; i < len; i++) | |
341 { | |
131 | 342 if (ISUPPER (path[i])) |
343 printf (", 0, %d)", path[i] - UPPER_OFFSET); | |
344 else if (ISLOWER (path[i])) | |
0 | 345 printf (", 0, %d)", path[i] - 'a'); |
111 | 346 else if (ISDIGIT (path[i])) |
0 | 347 printf (", %d)", path[i] - '0'); |
348 else | |
349 gcc_unreachable (); | |
350 } | |
351 } | |
352 | |
353 static void | |
354 print_header (void) | |
355 { | |
356 /* N.B. Code below avoids putting squiggle braces in column 1 inside | |
357 a string, because this confuses some editors' syntax highlighting | |
358 engines. */ | |
359 | |
360 puts ("\ | |
361 /* Generated automatically by the program `genextract'\n\ | |
362 from the machine description file `md'. */\n\ | |
363 \n\ | |
131 | 364 #define IN_TARGET_CODE 1\n\ |
0 | 365 #include \"config.h\"\n\ |
366 #include \"system.h\"\n\ | |
367 #include \"coretypes.h\"\n\ | |
368 #include \"tm.h\"\n\ | |
369 #include \"rtl.h\"\n\ | |
370 #include \"insn-config.h\"\n\ | |
371 #include \"recog.h\"\n\ | |
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parents:
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372 #include \"diagnostic-core.h\"\n\ |
0 | 373 \n\ |
374 /* This variable is used as the \"location\" of any missing operand\n\ | |
375 whose numbers are skipped by a given pattern. */\n\ | |
376 static rtx junk ATTRIBUTE_UNUSED;\n"); | |
377 | |
378 puts ("\ | |
379 void\n\ | |
111 | 380 insn_extract (rtx_insn *insn)\n{\n\ |
0 | 381 rtx *ro = recog_data.operand;\n\ |
382 rtx **ro_loc = recog_data.operand_loc;\n\ | |
383 rtx pat = PATTERN (insn);\n\ | |
384 int i ATTRIBUTE_UNUSED; /* only for peepholes */\n\ | |
385 \n\ | |
111 | 386 if (flag_checking)\n\ |
387 {\n\ | |
388 memset (ro, 0xab, sizeof (*ro) * MAX_RECOG_OPERANDS);\n\ | |
389 memset (ro_loc, 0xab, sizeof (*ro_loc) * MAX_RECOG_OPERANDS);\n\ | |
390 }\n"); | |
0 | 391 |
392 puts ("\ | |
393 switch (INSN_CODE (insn))\n\ | |
394 {\n\ | |
395 default:\n\ | |
396 /* Control reaches here if insn_extract has been called with an\n\ | |
397 unrecognizable insn (code -1), or an insn whose INSN_CODE\n\ | |
398 corresponds to a DEFINE_EXPAND in the machine description;\n\ | |
399 either way, a bug. */\n\ | |
400 if (INSN_CODE (insn) < 0)\n\ | |
401 fatal_insn (\"unrecognizable insn:\", insn);\n\ | |
402 else\n\ | |
403 fatal_insn (\"insn with invalid code number:\", insn);\n"); | |
404 } | |
405 | |
406 int | |
111 | 407 main (int argc, const char **argv) |
0 | 408 { |
409 unsigned int i; | |
410 struct extraction *p; | |
411 struct code_ptr *link; | |
412 const char *name; | |
413 | |
414 progname = "genextract"; | |
415 | |
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416 if (!init_rtx_reader_args (argc, argv)) |
0 | 417 return (FATAL_EXIT_CODE); |
418 | |
419 /* Read the machine description. */ | |
420 | |
111 | 421 md_rtx_info info; |
422 while (read_md_rtx (&info)) | |
423 switch (GET_CODE (info.def)) | |
424 { | |
425 case DEFINE_INSN: | |
426 gen_insn (&info); | |
427 break; | |
0 | 428 |
111 | 429 case DEFINE_PEEPHOLE: |
0 | 430 { |
431 struct code_ptr *link = XNEW (struct code_ptr); | |
432 | |
111 | 433 link->insn_code = info.index; |
0 | 434 link->next = peepholes; |
435 peepholes = link; | |
436 } | |
111 | 437 break; |
438 | |
439 default: | |
440 break; | |
0 | 441 } |
442 | |
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443 if (have_error) |
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444 return FATAL_EXIT_CODE; |
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445 |
0 | 446 print_header (); |
447 | |
448 /* Write out code to handle peepholes and the insn_codes that it should | |
449 be called for. */ | |
450 if (peepholes) | |
451 { | |
452 for (link = peepholes; link; link = link->next) | |
453 printf (" case %d:\n", link->insn_code); | |
454 | |
455 /* The vector in the insn says how many operands it has. | |
456 And all it contains are operands. In fact, the vector was | |
457 created just for the sake of this function. We need to set the | |
458 location of the operands for sake of simplifications after | |
459 extraction, like eliminating subregs. */ | |
460 puts (" for (i = XVECLEN (pat, 0) - 1; i >= 0; i--)\n" | |
461 " ro[i] = *(ro_loc[i] = &XVECEXP (pat, 0, i));\n" | |
462 " break;\n"); | |
463 } | |
464 | |
465 /* Write out all the ways to extract insn operands. */ | |
466 for (p = extractions; p; p = p->next) | |
467 { | |
468 for (link = p->insns; link; link = link->next) | |
469 { | |
470 i = link->insn_code; | |
471 name = get_insn_name (i); | |
472 if (name) | |
473 printf (" case %d: /* %s */\n", i, name); | |
474 else | |
475 printf (" case %d:\n", i); | |
476 } | |
477 | |
478 for (i = 0; i < p->op_count; i++) | |
479 { | |
480 if (p->oplocs[i] == 0) | |
481 { | |
482 printf (" ro[%d] = const0_rtx;\n", i); | |
483 printf (" ro_loc[%d] = &junk;\n", i); | |
484 } | |
485 else | |
486 { | |
487 printf (" ro[%d] = *(ro_loc[%d] = &", i, i); | |
488 print_path (p->oplocs[i]); | |
489 puts (");"); | |
490 } | |
491 } | |
492 | |
493 for (i = 0; i < p->dup_count; i++) | |
494 { | |
495 printf (" recog_data.dup_loc[%d] = &", i); | |
496 print_path (p->duplocs[i]); | |
497 puts (";"); | |
498 printf (" recog_data.dup_num[%d] = %d;\n", i, p->dupnums[i]); | |
499 } | |
500 | |
501 puts (" break;\n"); | |
502 } | |
503 | |
504 puts (" }\n}"); | |
505 fflush (stdout); | |
506 return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE); | |
507 } |