1 /* Translation of constants 2 Copyright (C) 2002-2019 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 "fold-const.h" 30 #include "stor-layout.h" 31 #include "realmpfr.h" 32 #include "trans-const.h" 33 #include "trans-types.h" 34 #include "target-memory.h" 35 36 tree gfc_rank_cst[GFC_MAX_DIMENSIONS + 1]; 37 38 /* Build a constant with given type from an int_cst. */ 39 40 tree 41 gfc_build_const (tree type, tree intval) 42 { 43 tree val; 44 tree zero; 45 46 switch (TREE_CODE (type)) 47 { 48 case INTEGER_TYPE: 49 val = convert (type, intval); 50 break; 51 52 case REAL_TYPE: 53 val = build_real_from_int_cst (type, intval); 54 break; 55 56 case COMPLEX_TYPE: 57 val = build_real_from_int_cst (TREE_TYPE (type), intval); 58 zero = build_real_from_int_cst (TREE_TYPE (type), integer_zero_node); 59 val = build_complex (type, val, zero); 60 break; 61 62 default: 63 gcc_unreachable (); 64 } 65 return val; 66 } 67 68 /* Build a string constant with C char type. */ 69 70 tree 71 gfc_build_string_const (size_t length, const char *s) 72 { 73 tree str; 74 tree len; 75 76 str = build_string (length, s); 77 len = size_int (length); 78 TREE_TYPE (str) = 79 build_array_type (gfc_character1_type_node, 80 build_range_type (gfc_charlen_type_node, 81 size_one_node, len)); 82 TYPE_STRING_FLAG (TREE_TYPE (str)) = 1; 83 return str; 84 } 85 86 87 /* Build a string constant with a type given by its kind; take care of 88 non-default character kinds. */ 89 90 tree 91 gfc_build_wide_string_const (int kind, size_t length, const gfc_char_t *string) 92 { 93 int i; 94 tree str, len; 95 size_t size; 96 char *s; 97 98 i = gfc_validate_kind (BT_CHARACTER, kind, false); 99 size = length * gfc_character_kinds[i].bit_size / 8; 100 101 s = XCNEWVAR (char, size); 102 gfc_encode_character (kind, length, string, (unsigned char *) s, size); 103 104 str = build_string (size, s); 105 free (s); 106 107 len = size_int (length); 108 TREE_TYPE (str) = 109 build_array_type (gfc_get_char_type (kind), 110 build_range_type (gfc_charlen_type_node, 111 size_one_node, len)); 112 TYPE_STRING_FLAG (TREE_TYPE (str)) = 1; 113 return str; 114 } 115 116 117 /* Build a Fortran character constant from a zero-terminated string. 118 There a two version of this function, one that translates the string 119 and one that doesn't. */ 120 tree 121 gfc_build_cstring_const (const char *string) 122 { 123 return gfc_build_string_const (strlen (string) + 1, string); 124 } 125 126 tree 127 gfc_build_localized_cstring_const (const char *msgid) 128 { 129 const char *localized = _(msgid); 130 return gfc_build_string_const (strlen (localized) + 1, localized); 131 } 132 133 134 /* Return a string constant with the given length. Used for static 135 initializers. The constant will be padded or truncated to match 136 length. */ 137 138 tree 139 gfc_conv_string_init (tree length, gfc_expr * expr) 140 { 141 gfc_char_t *s; 142 HOST_WIDE_INT len; 143 gfc_charlen_t slen; 144 tree str; 145 bool free_s = false; 146 147 gcc_assert (expr->expr_type == EXPR_CONSTANT); 148 gcc_assert (expr->ts.type == BT_CHARACTER); 149 gcc_assert (tree_fits_uhwi_p (length)); 150 151 len = TREE_INT_CST_LOW (length); 152 slen = expr->value.character.length; 153 154 if (len > slen) 155 { 156 s = gfc_get_wide_string (len); 157 memcpy (s, expr->value.character.string, slen * sizeof (gfc_char_t)); 158 gfc_wide_memset (&s[slen], ' ', len - slen); 159 free_s = true; 160 } 161 else 162 s = expr->value.character.string; 163 164 str = gfc_build_wide_string_const (expr->ts.kind, len, s); 165 166 if (free_s) 167 free (s); 168 169 return str; 170 } 171 172 173 /* Create a tree node for the string length if it is constant. */ 174 175 void 176 gfc_conv_const_charlen (gfc_charlen * cl) 177 { 178 if (!cl || cl->backend_decl) 179 return; 180 181 if (cl->length && cl->length->expr_type == EXPR_CONSTANT) 182 { 183 cl->backend_decl = gfc_conv_mpz_to_tree (cl->length->value.integer, 184 cl->length->ts.kind); 185 cl->backend_decl = fold_convert (gfc_charlen_type_node, 186 cl->backend_decl); 187 } 188 } 189 190 void 191 gfc_init_constants (void) 192 { 193 int n; 194 195 for (n = 0; n <= GFC_MAX_DIMENSIONS; n++) 196 gfc_rank_cst[n] = build_int_cst (gfc_array_index_type, n); 197 } 198 199 /* Converts a GMP integer into a backend tree node. */ 200 201 tree 202 gfc_conv_mpz_to_tree (mpz_t i, int kind) 203 { 204 wide_int val = wi::from_mpz (gfc_get_int_type (kind), i, true); 205 return wide_int_to_tree (gfc_get_int_type (kind), val); 206 } 207 208 209 /* Convert a GMP integer into a tree node of type given by the type 210 argument. */ 211 212 tree 213 gfc_conv_mpz_to_tree_type (mpz_t i, const tree type) 214 { 215 const wide_int val = wi::from_mpz (type, i, true); 216 return wide_int_to_tree (type, val); 217 } 218 219 220 /* Converts a backend tree into a GMP integer. */ 221 222 void 223 gfc_conv_tree_to_mpz (mpz_t i, tree source) 224 { 225 wi::to_mpz (wi::to_wide (source), i, TYPE_SIGN (TREE_TYPE (source))); 226 } 227 228 /* Converts a real constant into backend form. */ 229 230 tree 231 gfc_conv_mpfr_to_tree (mpfr_t f, int kind, int is_snan) 232 { 233 tree type; 234 int n; 235 REAL_VALUE_TYPE real; 236 237 n = gfc_validate_kind (BT_REAL, kind, false); 238 gcc_assert (gfc_real_kinds[n].radix == 2); 239 240 type = gfc_get_real_type (kind); 241 if (mpfr_nan_p (f) && is_snan) 242 real_from_string (&real, "SNaN"); 243 else 244 real_from_mpfr (&real, f, type, GFC_RND_MODE); 245 246 return build_real (type, real); 247 } 248 249 /* Returns a real constant that is +Infinity if the target 250 supports infinities for this floating-point mode, and 251 +HUGE_VAL otherwise (the largest representable number). */ 252 253 tree 254 gfc_build_inf_or_huge (tree type, int kind) 255 { 256 if (HONOR_INFINITIES (TYPE_MODE (type))) 257 { 258 REAL_VALUE_TYPE real; 259 real_inf (&real); 260 return build_real (type, real); 261 } 262 else 263 { 264 int k = gfc_validate_kind (BT_REAL, kind, false); 265 return gfc_conv_mpfr_to_tree (gfc_real_kinds[k].huge, kind, 0); 266 } 267 } 268 269 /* Returns a floating-point NaN of a given type. */ 270 271 tree 272 gfc_build_nan (tree type, const char *str) 273 { 274 REAL_VALUE_TYPE real; 275 real_nan (&real, str, 1, TYPE_MODE (type)); 276 return build_real (type, real); 277 } 278 279 /* Converts a backend tree into a real constant. */ 280 281 void 282 gfc_conv_tree_to_mpfr (mpfr_ptr f, tree source) 283 { 284 mpfr_from_real (f, TREE_REAL_CST_PTR (source), GFC_RND_MODE); 285 } 286 287 /* Translate any literal constant to a tree. Constants never have 288 pre or post chains. Character literal constants are special 289 special because they have a value and a length, so they cannot be 290 returned as a single tree. It is up to the caller to set the 291 length somewhere if necessary. 292 293 Returns the translated constant, or aborts if it gets a type it 294 can't handle. */ 295 296 tree 297 gfc_conv_constant_to_tree (gfc_expr * expr) 298 { 299 tree res; 300 301 gcc_assert (expr->expr_type == EXPR_CONSTANT); 302 303 /* If it is has a prescribed memory representation, we build a string 304 constant and VIEW_CONVERT to its type. */ 305 306 switch (expr->ts.type) 307 { 308 case BT_INTEGER: 309 if (expr->representation.string) 310 return fold_build1_loc (input_location, VIEW_CONVERT_EXPR, 311 gfc_get_int_type (expr->ts.kind), 312 gfc_build_string_const (expr->representation.length, 313 expr->representation.string)); 314 else 315 return gfc_conv_mpz_to_tree (expr->value.integer, expr->ts.kind); 316 317 case BT_REAL: 318 if (expr->representation.string) 319 return fold_build1_loc (input_location, VIEW_CONVERT_EXPR, 320 gfc_get_real_type (expr->ts.kind), 321 gfc_build_string_const (expr->representation.length, 322 expr->representation.string)); 323 else 324 return gfc_conv_mpfr_to_tree (expr->value.real, expr->ts.kind, expr->is_snan); 325 326 case BT_LOGICAL: 327 if (expr->representation.string) 328 { 329 tree tmp = fold_build1_loc (input_location, VIEW_CONVERT_EXPR, 330 gfc_get_int_type (expr->ts.kind), 331 gfc_build_string_const (expr->representation.length, 332 expr->representation.string)); 333 if (!integer_zerop (tmp) && !integer_onep (tmp)) 334 gfc_warning (0, "Assigning value other than 0 or 1 to LOGICAL" 335 " has undefined result at %L", &expr->where); 336 return fold_convert (gfc_get_logical_type (expr->ts.kind), tmp); 337 } 338 else 339 return build_int_cst (gfc_get_logical_type (expr->ts.kind), 340 expr->value.logical); 341 342 case BT_COMPLEX: 343 if (expr->representation.string) 344 return fold_build1_loc (input_location, VIEW_CONVERT_EXPR, 345 gfc_get_complex_type (expr->ts.kind), 346 gfc_build_string_const (expr->representation.length, 347 expr->representation.string)); 348 else 349 { 350 tree real = gfc_conv_mpfr_to_tree (mpc_realref (expr->value.complex), 351 expr->ts.kind, expr->is_snan); 352 tree imag = gfc_conv_mpfr_to_tree (mpc_imagref (expr->value.complex), 353 expr->ts.kind, expr->is_snan); 354 355 return build_complex (gfc_typenode_for_spec (&expr->ts), 356 real, imag); 357 } 358 359 case BT_CHARACTER: 360 res = gfc_build_wide_string_const (expr->ts.kind, 361 expr->value.character.length, 362 expr->value.character.string); 363 return res; 364 365 case BT_HOLLERITH: 366 return gfc_build_string_const (expr->representation.length, 367 expr->representation.string); 368 369 default: 370 gcc_unreachable (); 371 } 372 } 373 374 375 /* Like gfc_conv_constant_to_tree, but for a simplified expression. 376 We can handle character literal constants here as well. */ 377 378 void 379 gfc_conv_constant (gfc_se * se, gfc_expr * expr) 380 { 381 gfc_ss *ss; 382 383 /* We may be receiving an expression for C_NULL_PTR or C_NULL_FUNPTR. If 384 so, the expr_type will not yet be an EXPR_CONSTANT. We need to make 385 it so here. */ 386 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived 387 && expr->ts.u.derived->attr.is_iso_c) 388 { 389 if (expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_PTR 390 || expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_FUNPTR) 391 { 392 /* Create a new EXPR_CONSTANT expression for our local uses. */ 393 expr = gfc_get_int_expr (gfc_default_integer_kind, NULL, 0); 394 } 395 } 396 397 if (expr->expr_type != EXPR_CONSTANT) 398 { 399 gfc_expr *e = gfc_get_int_expr (gfc_default_integer_kind, NULL, 0); 400 gfc_error ("non-constant initialization expression at %L", &expr->where); 401 se->expr = gfc_conv_constant_to_tree (e); 402 return; 403 } 404 405 ss = se->ss; 406 if (ss != NULL) 407 { 408 gfc_ss_info *ss_info; 409 410 ss_info = ss->info; 411 gcc_assert (ss != gfc_ss_terminator); 412 gcc_assert (ss_info->type == GFC_SS_SCALAR); 413 gcc_assert (ss_info->expr == expr); 414 415 se->expr = ss_info->data.scalar.value; 416 se->string_length = ss_info->string_length; 417 gfc_advance_se_ss_chain (se); 418 return; 419 } 420 421 /* Translate the constant and put it in the simplifier structure. */ 422 se->expr = gfc_conv_constant_to_tree (expr); 423 424 /* If this is a CHARACTER string, set its length in the simplifier 425 structure, too. */ 426 if (expr->ts.type == BT_CHARACTER) 427 se->string_length = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (se->expr))); 428 } 429