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 | } |
420 | |