Mercurial > hg > CbC > CbC_gcc
comparison gcc/fortran/trans-const.c @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 84e7813d76e9 |
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68:561a7518be6b | 111:04ced10e8804 |
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1 /* Translation of constants | |
2 Copyright (C) 2002-2017 Free Software Foundation, Inc. | |
3 Contributed by Paul Brook | |
4 | |
5 This file is part of GCC. | |
6 | |
7 GCC is free software; you can redistribute it and/or modify it under | |
8 the terms of the GNU General Public License as published by the Free | |
9 Software Foundation; either version 3, or (at your option) any later | |
10 version. | |
11 | |
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
18 along with GCC; see the file COPYING3. If not see | |
19 <http://www.gnu.org/licenses/>. */ | |
20 | |
21 /* trans-const.c -- convert constant values */ | |
22 | |
23 #include "config.h" | |
24 #include "system.h" | |
25 #include "coretypes.h" | |
26 #include "tree.h" | |
27 #include "gfortran.h" | |
28 #include "trans.h" | |
29 #include "diagnostic-core.h" /* For fatal_error. */ | |
30 #include "fold-const.h" | |
31 #include "stor-layout.h" | |
32 #include "realmpfr.h" | |
33 #include "trans-const.h" | |
34 #include "trans-types.h" | |
35 #include "target-memory.h" | |
36 | |
37 tree gfc_rank_cst[GFC_MAX_DIMENSIONS + 1]; | |
38 | |
39 /* Build a constant with given type from an int_cst. */ | |
40 | |
41 tree | |
42 gfc_build_const (tree type, tree intval) | |
43 { | |
44 tree val; | |
45 tree zero; | |
46 | |
47 switch (TREE_CODE (type)) | |
48 { | |
49 case INTEGER_TYPE: | |
50 val = convert (type, intval); | |
51 break; | |
52 | |
53 case REAL_TYPE: | |
54 val = build_real_from_int_cst (type, intval); | |
55 break; | |
56 | |
57 case COMPLEX_TYPE: | |
58 val = build_real_from_int_cst (TREE_TYPE (type), intval); | |
59 zero = build_real_from_int_cst (TREE_TYPE (type), integer_zero_node); | |
60 val = build_complex (type, val, zero); | |
61 break; | |
62 | |
63 default: | |
64 gcc_unreachable (); | |
65 } | |
66 return val; | |
67 } | |
68 | |
69 /* Build a string constant with C char type. */ | |
70 | |
71 tree | |
72 gfc_build_string_const (int length, const char *s) | |
73 { | |
74 tree str; | |
75 tree len; | |
76 | |
77 str = build_string (length, s); | |
78 len = size_int (length); | |
79 TREE_TYPE (str) = | |
80 build_array_type (gfc_character1_type_node, | |
81 build_range_type (gfc_charlen_type_node, | |
82 size_one_node, len)); | |
83 TYPE_STRING_FLAG (TREE_TYPE (str)) = 1; | |
84 return str; | |
85 } | |
86 | |
87 | |
88 /* Build a string constant with a type given by its kind; take care of | |
89 non-default character kinds. */ | |
90 | |
91 tree | |
92 gfc_build_wide_string_const (int kind, int length, const gfc_char_t *string) | |
93 { | |
94 int i; | |
95 tree str, len; | |
96 size_t size; | |
97 char *s; | |
98 | |
99 i = gfc_validate_kind (BT_CHARACTER, kind, false); | |
100 size = length * gfc_character_kinds[i].bit_size / 8; | |
101 | |
102 s = XCNEWVAR (char, size); | |
103 gfc_encode_character (kind, length, string, (unsigned char *) s, size); | |
104 | |
105 str = build_string (size, s); | |
106 free (s); | |
107 | |
108 len = size_int (length); | |
109 TREE_TYPE (str) = | |
110 build_array_type (gfc_get_char_type (kind), | |
111 build_range_type (gfc_charlen_type_node, | |
112 size_one_node, len)); | |
113 TYPE_STRING_FLAG (TREE_TYPE (str)) = 1; | |
114 return str; | |
115 } | |
116 | |
117 | |
118 /* Build a Fortran character constant from a zero-terminated string. | |
119 There a two version of this function, one that translates the string | |
120 and one that doesn't. */ | |
121 tree | |
122 gfc_build_cstring_const (const char *string) | |
123 { | |
124 return gfc_build_string_const (strlen (string) + 1, string); | |
125 } | |
126 | |
127 tree | |
128 gfc_build_localized_cstring_const (const char *msgid) | |
129 { | |
130 const char *localized = _(msgid); | |
131 return gfc_build_string_const (strlen (localized) + 1, localized); | |
132 } | |
133 | |
134 | |
135 /* Return a string constant with the given length. Used for static | |
136 initializers. The constant will be padded or truncated to match | |
137 length. */ | |
138 | |
139 tree | |
140 gfc_conv_string_init (tree length, gfc_expr * expr) | |
141 { | |
142 gfc_char_t *s; | |
143 HOST_WIDE_INT len; | |
144 int slen; | |
145 tree str; | |
146 bool free_s = false; | |
147 | |
148 gcc_assert (expr->expr_type == EXPR_CONSTANT); | |
149 gcc_assert (expr->ts.type == BT_CHARACTER); | |
150 gcc_assert (tree_fits_uhwi_p (length)); | |
151 | |
152 len = TREE_INT_CST_LOW (length); | |
153 slen = expr->value.character.length; | |
154 | |
155 if (len > slen) | |
156 { | |
157 s = gfc_get_wide_string (len); | |
158 memcpy (s, expr->value.character.string, slen * sizeof (gfc_char_t)); | |
159 gfc_wide_memset (&s[slen], ' ', len - slen); | |
160 free_s = true; | |
161 } | |
162 else | |
163 s = expr->value.character.string; | |
164 | |
165 str = gfc_build_wide_string_const (expr->ts.kind, len, s); | |
166 | |
167 if (free_s) | |
168 free (s); | |
169 | |
170 return str; | |
171 } | |
172 | |
173 | |
174 /* Create a tree node for the string length if it is constant. */ | |
175 | |
176 void | |
177 gfc_conv_const_charlen (gfc_charlen * cl) | |
178 { | |
179 if (!cl || cl->backend_decl) | |
180 return; | |
181 | |
182 if (cl->length && cl->length->expr_type == EXPR_CONSTANT) | |
183 { | |
184 cl->backend_decl = gfc_conv_mpz_to_tree (cl->length->value.integer, | |
185 cl->length->ts.kind); | |
186 cl->backend_decl = fold_convert (gfc_charlen_type_node, | |
187 cl->backend_decl); | |
188 } | |
189 } | |
190 | |
191 void | |
192 gfc_init_constants (void) | |
193 { | |
194 int n; | |
195 | |
196 for (n = 0; n <= GFC_MAX_DIMENSIONS; n++) | |
197 gfc_rank_cst[n] = build_int_cst (gfc_array_index_type, n); | |
198 } | |
199 | |
200 /* Converts a GMP integer into a backend tree node. */ | |
201 | |
202 tree | |
203 gfc_conv_mpz_to_tree (mpz_t i, int kind) | |
204 { | |
205 wide_int val = wi::from_mpz (gfc_get_int_type (kind), i, true); | |
206 return wide_int_to_tree (gfc_get_int_type (kind), val); | |
207 } | |
208 | |
209 /* Converts a backend tree into a GMP integer. */ | |
210 | |
211 void | |
212 gfc_conv_tree_to_mpz (mpz_t i, tree source) | |
213 { | |
214 wi::to_mpz (wi::to_wide (source), i, TYPE_SIGN (TREE_TYPE (source))); | |
215 } | |
216 | |
217 /* Converts a real constant into backend form. */ | |
218 | |
219 tree | |
220 gfc_conv_mpfr_to_tree (mpfr_t f, int kind, int is_snan) | |
221 { | |
222 tree type; | |
223 int n; | |
224 REAL_VALUE_TYPE real; | |
225 | |
226 n = gfc_validate_kind (BT_REAL, kind, false); | |
227 gcc_assert (gfc_real_kinds[n].radix == 2); | |
228 | |
229 type = gfc_get_real_type (kind); | |
230 if (mpfr_nan_p (f) && is_snan) | |
231 real_from_string (&real, "SNaN"); | |
232 else | |
233 real_from_mpfr (&real, f, type, GFC_RND_MODE); | |
234 | |
235 return build_real (type, real); | |
236 } | |
237 | |
238 /* Returns a real constant that is +Infinity if the target | |
239 supports infinities for this floating-point mode, and | |
240 +HUGE_VAL otherwise (the largest representable number). */ | |
241 | |
242 tree | |
243 gfc_build_inf_or_huge (tree type, int kind) | |
244 { | |
245 if (HONOR_INFINITIES (TYPE_MODE (type))) | |
246 { | |
247 REAL_VALUE_TYPE real; | |
248 real_inf (&real); | |
249 return build_real (type, real); | |
250 } | |
251 else | |
252 { | |
253 int k = gfc_validate_kind (BT_REAL, kind, false); | |
254 return gfc_conv_mpfr_to_tree (gfc_real_kinds[k].huge, kind, 0); | |
255 } | |
256 } | |
257 | |
258 /* Returns a floating-point NaN of a given type. */ | |
259 | |
260 tree | |
261 gfc_build_nan (tree type, const char *str) | |
262 { | |
263 REAL_VALUE_TYPE real; | |
264 real_nan (&real, str, 1, TYPE_MODE (type)); | |
265 return build_real (type, real); | |
266 } | |
267 | |
268 /* Converts a backend tree into a real constant. */ | |
269 | |
270 void | |
271 gfc_conv_tree_to_mpfr (mpfr_ptr f, tree source) | |
272 { | |
273 mpfr_from_real (f, TREE_REAL_CST_PTR (source), GFC_RND_MODE); | |
274 } | |
275 | |
276 /* Translate any literal constant to a tree. Constants never have | |
277 pre or post chains. Character literal constants are special | |
278 special because they have a value and a length, so they cannot be | |
279 returned as a single tree. It is up to the caller to set the | |
280 length somewhere if necessary. | |
281 | |
282 Returns the translated constant, or aborts if it gets a type it | |
283 can't handle. */ | |
284 | |
285 tree | |
286 gfc_conv_constant_to_tree (gfc_expr * expr) | |
287 { | |
288 tree res; | |
289 | |
290 gcc_assert (expr->expr_type == EXPR_CONSTANT); | |
291 | |
292 /* If it is has a prescribed memory representation, we build a string | |
293 constant and VIEW_CONVERT to its type. */ | |
294 | |
295 switch (expr->ts.type) | |
296 { | |
297 case BT_INTEGER: | |
298 if (expr->representation.string) | |
299 return fold_build1_loc (input_location, VIEW_CONVERT_EXPR, | |
300 gfc_get_int_type (expr->ts.kind), | |
301 gfc_build_string_const (expr->representation.length, | |
302 expr->representation.string)); | |
303 else | |
304 return gfc_conv_mpz_to_tree (expr->value.integer, expr->ts.kind); | |
305 | |
306 case BT_REAL: | |
307 if (expr->representation.string) | |
308 return fold_build1_loc (input_location, VIEW_CONVERT_EXPR, | |
309 gfc_get_real_type (expr->ts.kind), | |
310 gfc_build_string_const (expr->representation.length, | |
311 expr->representation.string)); | |
312 else | |
313 return gfc_conv_mpfr_to_tree (expr->value.real, expr->ts.kind, expr->is_snan); | |
314 | |
315 case BT_LOGICAL: | |
316 if (expr->representation.string) | |
317 { | |
318 tree tmp = fold_build1_loc (input_location, VIEW_CONVERT_EXPR, | |
319 gfc_get_int_type (expr->ts.kind), | |
320 gfc_build_string_const (expr->representation.length, | |
321 expr->representation.string)); | |
322 if (!integer_zerop (tmp) && !integer_onep (tmp)) | |
323 gfc_warning (0, "Assigning value other than 0 or 1 to LOGICAL" | |
324 " has undefined result at %L", &expr->where); | |
325 return fold_convert (gfc_get_logical_type (expr->ts.kind), tmp); | |
326 } | |
327 else | |
328 return build_int_cst (gfc_get_logical_type (expr->ts.kind), | |
329 expr->value.logical); | |
330 | |
331 case BT_COMPLEX: | |
332 if (expr->representation.string) | |
333 return fold_build1_loc (input_location, VIEW_CONVERT_EXPR, | |
334 gfc_get_complex_type (expr->ts.kind), | |
335 gfc_build_string_const (expr->representation.length, | |
336 expr->representation.string)); | |
337 else | |
338 { | |
339 tree real = gfc_conv_mpfr_to_tree (mpc_realref (expr->value.complex), | |
340 expr->ts.kind, expr->is_snan); | |
341 tree imag = gfc_conv_mpfr_to_tree (mpc_imagref (expr->value.complex), | |
342 expr->ts.kind, expr->is_snan); | |
343 | |
344 return build_complex (gfc_typenode_for_spec (&expr->ts), | |
345 real, imag); | |
346 } | |
347 | |
348 case BT_CHARACTER: | |
349 res = gfc_build_wide_string_const (expr->ts.kind, | |
350 expr->value.character.length, | |
351 expr->value.character.string); | |
352 return res; | |
353 | |
354 case BT_HOLLERITH: | |
355 return gfc_build_string_const (expr->representation.length, | |
356 expr->representation.string); | |
357 | |
358 default: | |
359 fatal_error (input_location, | |
360 "gfc_conv_constant_to_tree(): invalid type: %s", | |
361 gfc_typename (&expr->ts)); | |
362 } | |
363 } | |
364 | |
365 | |
366 /* Like gfc_conv_constant_to_tree, but for a simplified expression. | |
367 We can handle character literal constants here as well. */ | |
368 | |
369 void | |
370 gfc_conv_constant (gfc_se * se, gfc_expr * expr) | |
371 { | |
372 gfc_ss *ss; | |
373 | |
374 /* We may be receiving an expression for C_NULL_PTR or C_NULL_FUNPTR. If | |
375 so, the expr_type will not yet be an EXPR_CONSTANT. We need to make | |
376 it so here. */ | |
377 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived | |
378 && expr->ts.u.derived->attr.is_iso_c) | |
379 { | |
380 if (expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_PTR | |
381 || expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_FUNPTR) | |
382 { | |
383 /* Create a new EXPR_CONSTANT expression for our local uses. */ | |
384 expr = gfc_get_int_expr (gfc_default_integer_kind, NULL, 0); | |
385 } | |
386 } | |
387 | |
388 if (expr->expr_type != EXPR_CONSTANT) | |
389 { | |
390 gfc_expr *e = gfc_get_int_expr (gfc_default_integer_kind, NULL, 0); | |
391 gfc_error ("non-constant initialization expression at %L", &expr->where); | |
392 se->expr = gfc_conv_constant_to_tree (e); | |
393 return; | |
394 } | |
395 | |
396 ss = se->ss; | |
397 if (ss != NULL) | |
398 { | |
399 gfc_ss_info *ss_info; | |
400 | |
401 ss_info = ss->info; | |
402 gcc_assert (ss != gfc_ss_terminator); | |
403 gcc_assert (ss_info->type == GFC_SS_SCALAR); | |
404 gcc_assert (ss_info->expr == expr); | |
405 | |
406 se->expr = ss_info->data.scalar.value; | |
407 se->string_length = ss_info->string_length; | |
408 gfc_advance_se_ss_chain (se); | |
409 return; | |
410 } | |
411 | |
412 /* Translate the constant and put it in the simplifier structure. */ | |
413 se->expr = gfc_conv_constant_to_tree (expr); | |
414 | |
415 /* If this is a CHARACTER string, set its length in the simplifier | |
416 structure, too. */ | |
417 if (expr->ts.type == BT_CHARACTER) | |
418 se->string_length = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (se->expr))); | |
419 } |