1/**************************************************************************** 2 * * 3 * GNAT COMPILER COMPONENTS * 4 * * 5 * M I S C * 6 * * 7 * C Implementation File * 8 * * 9 * Copyright (C) 1992-2015, Free Software Foundation, Inc. * 10 * * 11 * GNAT is free software; you can redistribute it and/or modify it under * 12 * terms of the GNU General Public License as published by the Free Soft- * 13 * ware Foundation; either version 3, or (at your option) any later ver- * 14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- * 15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * 16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * 17 * for more details. You should have received a copy of the GNU General * 18 * Public License distributed with GNAT; see file COPYING3. If not see * 19 * <http://www.gnu.org/licenses/>. * 20 * * 21 * GNAT was originally developed by the GNAT team at New York University. * 22 * Extensive contributions were provided by Ada Core Technologies Inc. * 23 * * 24 ****************************************************************************/ 25 26#include "config.h" 27#include "system.h" 28#include "coretypes.h" 29#include "opts.h" 30#include "options.h" 31#include "tm.h" 32#include "hash-set.h" 33#include "machmode.h" 34#include "vec.h" 35#include "double-int.h" 36#include "input.h" 37#include "alias.h" 38#include "symtab.h" 39#include "wide-int.h" 40#include "inchash.h" 41#include "tree.h" 42#include "fold-const.h" 43#include "stor-layout.h" 44#include "print-tree.h" 45#include "diagnostic.h" 46#include "target.h" 47#include "ggc.h" 48#include "flags.h" 49#include "debug.h" 50#include "toplev.h" 51#include "langhooks.h" 52#include "langhooks-def.h" 53#include "plugin.h" 54#include "real.h" 55#include "hashtab.h" 56#include "hash-set.h" 57#include "vec.h" 58#include "machmode.h" 59#include "hard-reg-set.h" 60#include "input.h" 61#include "function.h" /* For pass_by_reference. */ 62#include "dwarf2out.h" 63 64#include "ada.h" 65#include "adadecode.h" 66#include "types.h" 67#include "atree.h" 68#include "elists.h" 69#include "namet.h" 70#include "nlists.h" 71#include "stringt.h" 72#include "uintp.h" 73#include "fe.h" 74#include "sinfo.h" 75#include "einfo.h" 76#include "ada-tree.h" 77#include "gigi.h" 78 79/* This symbol needs to be defined for the front-end. */ 80void *callgraph_info_file = NULL; 81 82/* Command-line argc and argv. These variables are global since they are 83 imported in back_end.adb. */ 84unsigned int save_argc; 85const char **save_argv; 86 87/* GNAT argc and argv. */ 88extern int gnat_argc; 89extern char **gnat_argv; 90 91#ifdef __cplusplus 92extern "C" { 93#endif 94 95/* Declare functions we use as part of startup. */ 96extern void __gnat_initialize (void *); 97extern void __gnat_install_SEH_handler (void *); 98extern void adainit (void); 99extern void _ada_gnat1drv (void); 100 101#ifdef __cplusplus 102} 103#endif 104 105/* The parser for the language. For us, we process the GNAT tree. */ 106 107static void 108gnat_parse_file (void) 109{ 110 int seh[2]; 111 112 /* Call the target specific initializations. */ 113 __gnat_initialize (NULL); 114 115 /* ??? Call the SEH initialization routine. This is to workaround 116 a bootstrap path problem. The call below should be removed at some 117 point and the SEH pointer passed to __gnat_initialize() above. */ 118 __gnat_install_SEH_handler((void *)seh); 119 120 /* Call the front-end elaboration procedures. */ 121 adainit (); 122 123 /* Call the front end. */ 124 _ada_gnat1drv (); 125} 126 127/* Return language mask for option processing. */ 128 129static unsigned int 130gnat_option_lang_mask (void) 131{ 132 return CL_Ada; 133} 134 135/* Decode all the language specific options that cannot be decoded by GCC. 136 The option decoding phase of GCC calls this routine on the flags that 137 are marked as Ada-specific. Return true on success or false on failure. */ 138 139static bool 140gnat_handle_option (size_t scode, const char *arg ATTRIBUTE_UNUSED, int value, 141 int kind ATTRIBUTE_UNUSED, location_t loc ATTRIBUTE_UNUSED, 142 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED) 143{ 144 enum opt_code code = (enum opt_code) scode; 145 146 switch (code) 147 { 148 case OPT_Wall: 149 handle_generated_option (&global_options, &global_options_set, 150 OPT_Wunused, NULL, value, 151 gnat_option_lang_mask (), kind, loc, 152 handlers, global_dc); 153 warn_uninitialized = value; 154 warn_maybe_uninitialized = value; 155 break; 156 157 case OPT_gant: 158 warning (0, "%<-gnat%> misspelled as %<-gant%>"); 159 160 /* ... fall through ... */ 161 162 case OPT_gnat: 163 case OPT_gnatO: 164 case OPT_fRTS_: 165 case OPT_I: 166 case OPT_nostdinc: 167 case OPT_nostdlib: 168 /* These are handled by the front-end. */ 169 break; 170 171 case OPT_fshort_enums: 172 /* This is handled by the middle-end. */ 173 break; 174 175 default: 176 gcc_unreachable (); 177 } 178 179 Ada_handle_option_auto (&global_options, &global_options_set, 180 scode, arg, value, 181 gnat_option_lang_mask (), kind, 182 loc, handlers, global_dc); 183 return true; 184} 185 186/* Initialize options structure OPTS. */ 187 188static void 189gnat_init_options_struct (struct gcc_options *opts) 190{ 191 /* Uninitialized really means uninitialized in Ada. */ 192 opts->x_flag_zero_initialized_in_bss = 0; 193 194 /* We don't care about errno in Ada and it causes __builtin_sqrt to 195 call the libm function rather than do it inline. */ 196 opts->x_flag_errno_math = 0; 197 opts->frontend_set_flag_errno_math = true; 198} 199 200/* Initialize for option processing. */ 201 202static void 203gnat_init_options (unsigned int decoded_options_count, 204 struct cl_decoded_option *decoded_options) 205{ 206 /* Reconstruct an argv array for use of back_end.adb. 207 208 ??? back_end.adb should not rely on this; instead, it should work with 209 decoded options without such reparsing, to ensure consistency in how 210 options are decoded. */ 211 unsigned int i; 212 213 save_argv = XNEWVEC (const char *, 2 * decoded_options_count + 1); 214 save_argc = 0; 215 for (i = 0; i < decoded_options_count; i++) 216 { 217 size_t num_elements = decoded_options[i].canonical_option_num_elements; 218 219 if (decoded_options[i].errors 220 || decoded_options[i].opt_index == OPT_SPECIAL_unknown 221 || num_elements == 0) 222 continue; 223 224 /* Deal with -I- specially since it must be a single switch. */ 225 if (decoded_options[i].opt_index == OPT_I 226 && num_elements == 2 227 && decoded_options[i].canonical_option[1][0] == '-' 228 && decoded_options[i].canonical_option[1][1] == '\0') 229 save_argv[save_argc++] = "-I-"; 230 else 231 { 232 gcc_assert (num_elements >= 1 && num_elements <= 2); 233 save_argv[save_argc++] = decoded_options[i].canonical_option[0]; 234 if (num_elements >= 2) 235 save_argv[save_argc++] = decoded_options[i].canonical_option[1]; 236 } 237 } 238 save_argv[save_argc] = NULL; 239 240 gnat_argv = (char **) xmalloc (sizeof (save_argv[0])); 241 gnat_argv[0] = xstrdup (save_argv[0]); /* name of the command */ 242 gnat_argc = 1; 243} 244 245/* Ada code requires variables for these settings rather than elements 246 of the global_options structure. */ 247#undef optimize 248#undef optimize_size 249#undef flag_compare_debug 250#undef flag_short_enums 251#undef flag_stack_check 252int gnat_encodings = 0; 253int optimize; 254int optimize_size; 255int flag_compare_debug; 256int flag_short_enums; 257enum stack_check_type flag_stack_check = NO_STACK_CHECK; 258 259/* Settings adjustments after switches processing by the back-end. 260 Note that the front-end switches processing (Scan_Compiler_Arguments) 261 has not been done yet at this point! */ 262 263static bool 264gnat_post_options (const char **pfilename ATTRIBUTE_UNUSED) 265{ 266 /* Excess precision other than "fast" requires front-end support. */ 267 if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD 268 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT) 269 sorry ("-fexcess-precision=standard for Ada"); 270 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST; 271 272 /* ??? The warning machinery is outsmarted by Ada. */ 273 warn_unused_parameter = 0; 274 275 /* No psABI change warnings for Ada. */ 276 warn_psabi = 0; 277 278 /* No caret by default for Ada. */ 279 if (!global_options_set.x_flag_diagnostics_show_caret) 280 global_dc->show_caret = false; 281 282 optimize = global_options.x_optimize; 283 optimize_size = global_options.x_optimize_size; 284 flag_compare_debug = global_options.x_flag_compare_debug; 285 flag_stack_check = global_options.x_flag_stack_check; 286 flag_short_enums = global_options.x_flag_short_enums; 287 288 /* Unfortunately the post_options hook is called before the value of 289 flag_short_enums is autodetected, if need be. Mimic the process 290 for our private flag_short_enums. */ 291 if (flag_short_enums == 2) 292 flag_short_enums = targetm.default_short_enums (); 293 294 return false; 295} 296 297/* Here is the function to handle the compiler error processing in GCC. */ 298 299static void 300internal_error_function (diagnostic_context *context, 301 const char *msgid, va_list *ap) 302{ 303 text_info tinfo; 304 char *buffer, *p, *loc; 305 String_Template temp, temp_loc; 306 String_Pointer sp, sp_loc; 307 expanded_location xloc; 308 309 /* Warn if plugins present. */ 310 warn_if_plugins (); 311 312 /* Reset the pretty-printer. */ 313 pp_clear_output_area (context->printer); 314 315 /* Format the message into the pretty-printer. */ 316 tinfo.format_spec = msgid; 317 tinfo.args_ptr = ap; 318 tinfo.err_no = errno; 319 pp_format_verbatim (context->printer, &tinfo); 320 321 /* Extract a (writable) pointer to the formatted text. */ 322 buffer = xstrdup (pp_formatted_text (context->printer)); 323 324 /* Go up to the first newline. */ 325 for (p = buffer; *p; p++) 326 if (*p == '\n') 327 { 328 *p = '\0'; 329 break; 330 } 331 332 temp.Low_Bound = 1; 333 temp.High_Bound = p - buffer; 334 sp.Bounds = &temp; 335 sp.Array = buffer; 336 337 xloc = expand_location (input_location); 338 if (context->show_column && xloc.column != 0) 339 loc = xasprintf ("%s:%d:%d", xloc.file, xloc.line, xloc.column); 340 else 341 loc = xasprintf ("%s:%d", xloc.file, xloc.line); 342 temp_loc.Low_Bound = 1; 343 temp_loc.High_Bound = strlen (loc); 344 sp_loc.Bounds = &temp_loc; 345 sp_loc.Array = loc; 346 347 Current_Error_Node = error_gnat_node; 348 Compiler_Abort (sp, sp_loc, true); 349} 350 351/* Perform all the initialization steps that are language-specific. */ 352 353static bool 354gnat_init (void) 355{ 356 /* Do little here, most of the standard declarations are set up after the 357 front-end has been run. Use the same `char' as C, this doesn't really 358 matter since we'll use the explicit `unsigned char' for Character. */ 359 build_common_tree_nodes (flag_signed_char, false); 360 361 /* In Ada, we use an unsigned 8-bit type for the default boolean type. */ 362 boolean_type_node = make_unsigned_type (8); 363 TREE_SET_CODE (boolean_type_node, BOOLEAN_TYPE); 364 SET_TYPE_RM_MAX_VALUE (boolean_type_node, 365 build_int_cst (boolean_type_node, 1)); 366 SET_TYPE_RM_SIZE (boolean_type_node, bitsize_int (1)); 367 boolean_true_node = TYPE_MAX_VALUE (boolean_type_node); 368 boolean_false_node = TYPE_MIN_VALUE (boolean_type_node); 369 370 sbitsize_one_node = sbitsize_int (1); 371 sbitsize_unit_node = sbitsize_int (BITS_PER_UNIT); 372 373 ptr_void_type_node = build_pointer_type (void_type_node); 374 375 /* Show that REFERENCE_TYPEs are internal and should be Pmode. */ 376 internal_reference_types (); 377 378 /* Register our internal error function. */ 379 global_dc->internal_error = &internal_error_function; 380 381 return true; 382} 383 384/* Initialize the GCC support for exception handling. */ 385 386void 387gnat_init_gcc_eh (void) 388{ 389 /* We shouldn't do anything if the No_Exceptions_Handler pragma is set, 390 though. This could for instance lead to the emission of tables with 391 references to symbols (such as the Ada eh personality routine) within 392 libraries we won't link against. */ 393 if (No_Exception_Handlers_Set ()) 394 return; 395 396 /* Tell GCC we are handling cleanup actions through exception propagation. 397 This opens possibilities that we don't take advantage of yet, but is 398 nonetheless necessary to ensure that fixup code gets assigned to the 399 right exception regions. */ 400 using_eh_for_cleanups (); 401 402 /* Turn on -fexceptions, -fnon-call-exceptions and -fdelete-dead-exceptions. 403 The first one triggers the generation of the necessary exception tables. 404 The second one is useful for two reasons: 1/ we map some asynchronous 405 signals like SEGV to exceptions, so we need to ensure that the insns 406 which can lead to such signals are correctly attached to the exception 407 region they pertain to, 2/ some calls to pure subprograms are handled as 408 libcall blocks and then marked as "cannot trap" if the flag is not set 409 (see emit_libcall_block). We should not let this be since it is possible 410 for such calls to actually raise in Ada. 411 The third one is an optimization that makes it possible to delete dead 412 instructions that may throw exceptions, most notably loads and stores, 413 as permitted in Ada. */ 414 flag_exceptions = 1; 415 flag_non_call_exceptions = 1; 416 flag_delete_dead_exceptions = 1; 417 418 init_eh (); 419} 420 421/* Initialize the GCC support for floating-point operations. */ 422 423void 424gnat_init_gcc_fp (void) 425{ 426 /* Disable FP optimizations that ignore the signedness of zero if 427 S'Signed_Zeros is true, but don't override the user if not. */ 428 if (Signed_Zeros_On_Target) 429 flag_signed_zeros = 1; 430 else if (!global_options_set.x_flag_signed_zeros) 431 flag_signed_zeros = 0; 432 433 /* Assume that FP operations can trap if S'Machine_Overflow is true, 434 but don't override the user if not. */ 435 if (Machine_Overflows_On_Target) 436 flag_trapping_math = 1; 437 else if (!global_options_set.x_flag_trapping_math) 438 flag_trapping_math = 0; 439} 440 441/* Print language-specific items in declaration NODE. */ 442 443static void 444gnat_print_decl (FILE *file, tree node, int indent) 445{ 446 switch (TREE_CODE (node)) 447 { 448 case CONST_DECL: 449 print_node (file, "corresponding var", 450 DECL_CONST_CORRESPONDING_VAR (node), indent + 4); 451 break; 452 453 case FIELD_DECL: 454 print_node (file, "original field", DECL_ORIGINAL_FIELD (node), 455 indent + 4); 456 break; 457 458 case VAR_DECL: 459 if (DECL_LOOP_PARM_P (node)) 460 print_node (file, "induction var", DECL_INDUCTION_VAR (node), 461 indent + 4); 462 else 463 print_node (file, "renamed object", DECL_RENAMED_OBJECT (node), 464 indent + 4); 465 break; 466 467 default: 468 break; 469 } 470} 471 472/* Print language-specific items in type NODE. */ 473 474static void 475gnat_print_type (FILE *file, tree node, int indent) 476{ 477 switch (TREE_CODE (node)) 478 { 479 case FUNCTION_TYPE: 480 print_node (file, "ci/co list", TYPE_CI_CO_LIST (node), indent + 4); 481 break; 482 483 case INTEGER_TYPE: 484 if (TYPE_MODULAR_P (node)) 485 print_node_brief (file, "modulus", TYPE_MODULUS (node), indent + 4); 486 else if (TYPE_HAS_ACTUAL_BOUNDS_P (node)) 487 print_node (file, "actual bounds", TYPE_ACTUAL_BOUNDS (node), 488 indent + 4); 489 else 490 print_node (file, "index type", TYPE_INDEX_TYPE (node), indent + 4); 491 492 /* ... fall through ... */ 493 494 case ENUMERAL_TYPE: 495 case BOOLEAN_TYPE: 496 print_node_brief (file, "RM size", TYPE_RM_SIZE (node), indent + 4); 497 498 /* ... fall through ... */ 499 500 case REAL_TYPE: 501 print_node_brief (file, "RM min", TYPE_RM_MIN_VALUE (node), indent + 4); 502 print_node_brief (file, "RM max", TYPE_RM_MAX_VALUE (node), indent + 4); 503 break; 504 505 case ARRAY_TYPE: 506 print_node (file,"actual bounds", TYPE_ACTUAL_BOUNDS (node), indent + 4); 507 break; 508 509 case VECTOR_TYPE: 510 print_node (file,"representative array", 511 TYPE_REPRESENTATIVE_ARRAY (node), indent + 4); 512 break; 513 514 case RECORD_TYPE: 515 if (TYPE_FAT_POINTER_P (node) || TYPE_CONTAINS_TEMPLATE_P (node)) 516 print_node (file, "unconstrained array", 517 TYPE_UNCONSTRAINED_ARRAY (node), indent + 4); 518 else 519 print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4); 520 break; 521 522 case UNION_TYPE: 523 case QUAL_UNION_TYPE: 524 print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4); 525 break; 526 527 default: 528 break; 529 } 530} 531 532/* Return the name to be printed for DECL. */ 533 534static const char * 535gnat_printable_name (tree decl, int verbosity) 536{ 537 const char *coded_name = IDENTIFIER_POINTER (DECL_NAME (decl)); 538 char *ada_name = (char *) ggc_alloc_atomic (strlen (coded_name) * 2 + 60); 539 540 __gnat_decode (coded_name, ada_name, 0); 541 542 if (verbosity == 2 && !DECL_IS_BUILTIN (decl)) 543 { 544 Set_Identifier_Casing (ada_name, DECL_SOURCE_FILE (decl)); 545 return ggc_strdup (Name_Buffer); 546 } 547 548 return ada_name; 549} 550 551/* Return the name to be used in DWARF debug info for DECL. */ 552 553static const char * 554gnat_dwarf_name (tree decl, int verbosity ATTRIBUTE_UNUSED) 555{ 556 gcc_assert (DECL_P (decl)); 557 return (const char *) IDENTIFIER_POINTER (DECL_NAME (decl)); 558} 559 560/* Return the descriptive type associated with TYPE, if any. */ 561 562static tree 563gnat_descriptive_type (const_tree type) 564{ 565 if (TYPE_STUB_DECL (type)) 566 return DECL_PARALLEL_TYPE (TYPE_STUB_DECL (type)); 567 else 568 return NULL_TREE; 569} 570 571/* Return the underlying base type of an enumeration type. */ 572 573static tree 574gnat_enum_underlying_base_type (const_tree) 575{ 576 /* Enumeration types are base types in Ada. */ 577 return void_type_node; 578} 579 580/* Return true if types T1 and T2 are identical for type hashing purposes. 581 Called only after doing all language independent checks. At present, 582 this function is only called when both types are FUNCTION_TYPE. */ 583 584static bool 585gnat_type_hash_eq (const_tree t1, const_tree t2) 586{ 587 gcc_assert (TREE_CODE (t1) == FUNCTION_TYPE); 588 return fntype_same_flags_p (t1, TYPE_CI_CO_LIST (t2), 589 TYPE_RETURN_UNCONSTRAINED_P (t2), 590 TYPE_RETURN_BY_DIRECT_REF_P (t2), 591 TREE_ADDRESSABLE (t2)); 592} 593 594/* Do nothing (return the tree node passed). */ 595 596static tree 597gnat_return_tree (tree t) 598{ 599 return t; 600} 601 602/* Get the alias set corresponding to a type or expression. */ 603 604static alias_set_type 605gnat_get_alias_set (tree type) 606{ 607 /* If this is a padding type, use the type of the first field. */ 608 if (TYPE_IS_PADDING_P (type)) 609 return get_alias_set (TREE_TYPE (TYPE_FIELDS (type))); 610 611 /* If the type is an unconstrained array, use the type of the 612 self-referential array we make. */ 613 else if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE) 614 return 615 get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type))))); 616 617 /* If the type can alias any other types, return the alias set 0. */ 618 else if (TYPE_P (type) 619 && TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (type))) 620 return 0; 621 622 return -1; 623} 624 625/* GNU_TYPE is a type. Return its maximum size in bytes, if known, 626 as a constant when possible. */ 627 628static tree 629gnat_type_max_size (const_tree gnu_type) 630{ 631 /* First see what we can get from TYPE_SIZE_UNIT, which might not 632 be constant even for simple expressions if it has already been 633 elaborated and possibly replaced by a VAR_DECL. */ 634 tree max_unitsize = max_size (TYPE_SIZE_UNIT (gnu_type), true); 635 636 /* If we don't have a constant, see what we can get from TYPE_ADA_SIZE, 637 which should stay untouched. */ 638 if (!tree_fits_uhwi_p (max_unitsize) 639 && RECORD_OR_UNION_TYPE_P (gnu_type) 640 && !TYPE_FAT_POINTER_P (gnu_type) 641 && TYPE_ADA_SIZE (gnu_type)) 642 { 643 tree max_adasize = max_size (TYPE_ADA_SIZE (gnu_type), true); 644 645 /* If we have succeeded in finding a constant, round it up to the 646 type's alignment and return the result in units. */ 647 if (tree_fits_uhwi_p (max_adasize)) 648 max_unitsize 649 = size_binop (CEIL_DIV_EXPR, 650 round_up (max_adasize, TYPE_ALIGN (gnu_type)), 651 bitsize_unit_node); 652 } 653 654 return max_unitsize; 655} 656 657/* Provide information in INFO for debug output about the TYPE array type. 658 Return whether TYPE is handled. */ 659 660static bool 661gnat_get_array_descr_info (const_tree type, struct array_descr_info *info) 662{ 663 bool convention_fortran_p; 664 tree index_type; 665 666 const_tree dimen = NULL_TREE; 667 const_tree last_dimen = NULL_TREE; 668 int i; 669 670 if (TREE_CODE (type) != ARRAY_TYPE 671 || !TYPE_DOMAIN (type) 672 || !TYPE_INDEX_TYPE (TYPE_DOMAIN (type))) 673 return false; 674 675 /* Count how many dimentions this array has. */ 676 for (i = 0, dimen = type; ; ++i, dimen = TREE_TYPE (dimen)) 677 if (i > 0 678 && (TREE_CODE (dimen) != ARRAY_TYPE 679 || !TYPE_MULTI_ARRAY_P (dimen))) 680 break; 681 info->ndimensions = i; 682 convention_fortran_p = TYPE_CONVENTION_FORTRAN_P (type); 683 684 /* TODO: For row major ordering, we probably want to emit nothing and 685 instead specify it as the default in Dw_TAG_compile_unit. */ 686 info->ordering = (convention_fortran_p 687 ? array_descr_ordering_column_major 688 : array_descr_ordering_row_major); 689 info->base_decl = NULL_TREE; 690 info->data_location = NULL_TREE; 691 info->allocated = NULL_TREE; 692 info->associated = NULL_TREE; 693 694 for (i = (convention_fortran_p ? info->ndimensions - 1 : 0), 695 dimen = type; 696 697 0 <= i && i < info->ndimensions; 698 699 i += (convention_fortran_p ? -1 : 1), 700 dimen = TREE_TYPE (dimen)) 701 { 702 /* We are interested in the stored bounds for the debug info. */ 703 index_type = TYPE_INDEX_TYPE (TYPE_DOMAIN (dimen)); 704 705 info->dimen[i].bounds_type = index_type; 706 info->dimen[i].lower_bound = TYPE_MIN_VALUE (index_type); 707 info->dimen[i].upper_bound = TYPE_MAX_VALUE (index_type); 708 last_dimen = dimen; 709 } 710 711 info->element_type = TREE_TYPE (last_dimen); 712 713 return true; 714} 715 716/* GNU_TYPE is a subtype of an integral type. Set LOWVAL to the low bound 717 and HIGHVAL to the high bound, respectively. */ 718 719static void 720gnat_get_subrange_bounds (const_tree gnu_type, tree *lowval, tree *highval) 721{ 722 *lowval = TYPE_MIN_VALUE (gnu_type); 723 *highval = TYPE_MAX_VALUE (gnu_type); 724} 725 726/* GNU_TYPE is the type of a subprogram parameter. Determine if it should be 727 passed by reference by default. */ 728 729bool 730default_pass_by_ref (tree gnu_type) 731{ 732 /* We pass aggregates by reference if they are sufficiently large for 733 their alignment. The ratio is somewhat arbitrary. We also pass by 734 reference if the target machine would either pass or return by 735 reference. Strictly speaking, we need only check the return if this 736 is an In Out parameter, but it's probably best to err on the side of 737 passing more things by reference. */ 738 739 if (pass_by_reference (NULL, TYPE_MODE (gnu_type), gnu_type, true)) 740 return true; 741 742 if (targetm.calls.return_in_memory (gnu_type, NULL_TREE)) 743 return true; 744 745 if (AGGREGATE_TYPE_P (gnu_type) 746 && (!valid_constant_size_p (TYPE_SIZE_UNIT (gnu_type)) 747 || 0 < compare_tree_int (TYPE_SIZE_UNIT (gnu_type), 748 TYPE_ALIGN (gnu_type)))) 749 return true; 750 751 return false; 752} 753 754/* GNU_TYPE is the type of a subprogram parameter. Determine if it must be 755 passed by reference. */ 756 757bool 758must_pass_by_ref (tree gnu_type) 759{ 760 /* We pass only unconstrained objects, those required by the language 761 to be passed by reference, and objects of variable size. The latter 762 is more efficient, avoids problems with variable size temporaries, 763 and does not produce compatibility problems with C, since C does 764 not have such objects. */ 765 return (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE 766 || TYPE_IS_BY_REFERENCE_P (gnu_type) 767 || (TYPE_SIZE_UNIT (gnu_type) 768 && TREE_CODE (TYPE_SIZE_UNIT (gnu_type)) != INTEGER_CST)); 769} 770 771/* This function is called by the front-end to enumerate all the supported 772 modes for the machine, as well as some predefined C types. F is a function 773 which is called back with the parameters as listed below, first a string, 774 then seven ints. The name is any arbitrary null-terminated string and has 775 no particular significance, except for the case of predefined C types, where 776 it should be the name of the C type. For integer types, only signed types 777 should be listed, unsigned versions are assumed. The order of types should 778 be in order of preference, with the smallest/cheapest types first. 779 780 In particular, C predefined types should be listed before other types, 781 binary floating point types before decimal ones, and narrower/cheaper 782 type versions before more expensive ones. In type selection the first 783 matching variant will be used. 784 785 NAME pointer to first char of type name 786 DIGS number of decimal digits for floating-point modes, else 0 787 COMPLEX_P nonzero is this represents a complex mode 788 COUNT count of number of items, nonzero for vector mode 789 FLOAT_REP Float_Rep_Kind for FP, otherwise undefined 790 PRECISION number of bits used to store data 791 SIZE number of bits occupied by the mode 792 ALIGN number of bits to which mode is aligned. */ 793 794void 795enumerate_modes (void (*f) (const char *, int, int, int, int, int, int, int)) 796{ 797 const tree c_types[] 798 = { float_type_node, double_type_node, long_double_type_node }; 799 const char *const c_names[] 800 = { "float", "double", "long double" }; 801 int iloop; 802 803 /* We are going to compute it below. */ 804 fp_arith_may_widen = false; 805 806 for (iloop = 0; iloop < NUM_MACHINE_MODES; iloop++) 807 { 808 machine_mode i = (machine_mode) iloop; 809 machine_mode inner_mode = i; 810 bool float_p = false; 811 bool complex_p = false; 812 bool vector_p = false; 813 bool skip_p = false; 814 int digs = 0; 815 unsigned int nameloop; 816 Float_Rep_Kind float_rep = IEEE_Binary; /* Until proven otherwise */ 817 818 switch (GET_MODE_CLASS (i)) 819 { 820 case MODE_INT: 821 break; 822 case MODE_FLOAT: 823 float_p = true; 824 break; 825 case MODE_COMPLEX_INT: 826 complex_p = true; 827 inner_mode = GET_MODE_INNER (i); 828 break; 829 case MODE_COMPLEX_FLOAT: 830 float_p = true; 831 complex_p = true; 832 inner_mode = GET_MODE_INNER (i); 833 break; 834 case MODE_VECTOR_INT: 835 vector_p = true; 836 inner_mode = GET_MODE_INNER (i); 837 break; 838 case MODE_VECTOR_FLOAT: 839 float_p = true; 840 vector_p = true; 841 inner_mode = GET_MODE_INNER (i); 842 break; 843 default: 844 skip_p = true; 845 } 846 847 if (float_p) 848 { 849 const struct real_format *fmt = REAL_MODE_FORMAT (inner_mode); 850 851 /* ??? Cope with the ghost XFmode of the ARM port. */ 852 if (!fmt) 853 continue; 854 855 /* Be conservative and consider that floating-point arithmetics may 856 use wider intermediate results as soon as there is an extended 857 Motorola or Intel mode supported by the machine. */ 858 if (fmt == &ieee_extended_motorola_format 859 || fmt == &ieee_extended_intel_96_format 860 || fmt == &ieee_extended_intel_96_round_53_format 861 || fmt == &ieee_extended_intel_128_format) 862 fp_arith_may_widen = true; 863 864 if (fmt->b == 2) 865 digs = (fmt->p - 1) * 1233 / 4096; /* scale by log (2) */ 866 867 else if (fmt->b == 10) 868 digs = fmt->p; 869 870 else 871 gcc_unreachable(); 872 } 873 874 /* First register any C types for this mode that the front end 875 may need to know about, unless the mode should be skipped. */ 876 if (!skip_p && !vector_p) 877 for (nameloop = 0; nameloop < ARRAY_SIZE (c_types); nameloop++) 878 { 879 tree type = c_types[nameloop]; 880 const char *name = c_names[nameloop]; 881 882 if (TYPE_MODE (type) == i) 883 { 884 f (name, digs, complex_p, 0, float_rep, TYPE_PRECISION (type), 885 TREE_INT_CST_LOW (TYPE_SIZE (type)), TYPE_ALIGN (type)); 886 skip_p = true; 887 } 888 } 889 890 /* If no predefined C types were found, register the mode itself. */ 891 if (!skip_p) 892 f (GET_MODE_NAME (i), digs, complex_p, 893 vector_p ? GET_MODE_NUNITS (i) : 0, float_rep, 894 GET_MODE_PRECISION (i), GET_MODE_BITSIZE (i), 895 GET_MODE_ALIGNMENT (i)); 896 } 897} 898 899/* Return the size of the FP mode with precision PREC. */ 900 901int 902fp_prec_to_size (int prec) 903{ 904 machine_mode mode; 905 906 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode; 907 mode = GET_MODE_WIDER_MODE (mode)) 908 if (GET_MODE_PRECISION (mode) == prec) 909 return GET_MODE_BITSIZE (mode); 910 911 gcc_unreachable (); 912} 913 914/* Return the precision of the FP mode with size SIZE. */ 915 916int 917fp_size_to_prec (int size) 918{ 919 machine_mode mode; 920 921 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode; 922 mode = GET_MODE_WIDER_MODE (mode)) 923 if (GET_MODE_BITSIZE (mode) == size) 924 return GET_MODE_PRECISION (mode); 925 926 gcc_unreachable (); 927} 928 929static GTY(()) tree gnat_eh_personality_decl; 930 931/* Return the GNAT personality function decl. */ 932 933static tree 934gnat_eh_personality (void) 935{ 936 if (!gnat_eh_personality_decl) 937 gnat_eh_personality_decl = build_personality_function ("gnat"); 938 return gnat_eh_personality_decl; 939} 940 941/* Initialize language-specific bits of tree_contains_struct. */ 942 943static void 944gnat_init_ts (void) 945{ 946 MARK_TS_COMMON (UNCONSTRAINED_ARRAY_TYPE); 947 948 MARK_TS_TYPED (UNCONSTRAINED_ARRAY_REF); 949 MARK_TS_TYPED (NULL_EXPR); 950 MARK_TS_TYPED (PLUS_NOMOD_EXPR); 951 MARK_TS_TYPED (MINUS_NOMOD_EXPR); 952 MARK_TS_TYPED (ATTR_ADDR_EXPR); 953 MARK_TS_TYPED (STMT_STMT); 954 MARK_TS_TYPED (LOOP_STMT); 955 MARK_TS_TYPED (EXIT_STMT); 956} 957 958/* Definitions for our language-specific hooks. */ 959 960#undef LANG_HOOKS_NAME 961#define LANG_HOOKS_NAME "GNU Ada" 962#undef LANG_HOOKS_IDENTIFIER_SIZE 963#define LANG_HOOKS_IDENTIFIER_SIZE sizeof (struct tree_identifier) 964#undef LANG_HOOKS_INIT 965#define LANG_HOOKS_INIT gnat_init 966#undef LANG_HOOKS_OPTION_LANG_MASK 967#define LANG_HOOKS_OPTION_LANG_MASK gnat_option_lang_mask 968#undef LANG_HOOKS_INIT_OPTIONS_STRUCT 969#define LANG_HOOKS_INIT_OPTIONS_STRUCT gnat_init_options_struct 970#undef LANG_HOOKS_INIT_OPTIONS 971#define LANG_HOOKS_INIT_OPTIONS gnat_init_options 972#undef LANG_HOOKS_HANDLE_OPTION 973#define LANG_HOOKS_HANDLE_OPTION gnat_handle_option 974#undef LANG_HOOKS_POST_OPTIONS 975#define LANG_HOOKS_POST_OPTIONS gnat_post_options 976#undef LANG_HOOKS_PARSE_FILE 977#define LANG_HOOKS_PARSE_FILE gnat_parse_file 978#undef LANG_HOOKS_TYPE_HASH_EQ 979#define LANG_HOOKS_TYPE_HASH_EQ gnat_type_hash_eq 980#undef LANG_HOOKS_GETDECLS 981#define LANG_HOOKS_GETDECLS lhd_return_null_tree_v 982#undef LANG_HOOKS_PUSHDECL 983#define LANG_HOOKS_PUSHDECL gnat_return_tree 984#undef LANG_HOOKS_WRITE_GLOBALS 985#define LANG_HOOKS_WRITE_GLOBALS gnat_write_global_declarations 986#undef LANG_HOOKS_GET_ALIAS_SET 987#define LANG_HOOKS_GET_ALIAS_SET gnat_get_alias_set 988#undef LANG_HOOKS_PRINT_DECL 989#define LANG_HOOKS_PRINT_DECL gnat_print_decl 990#undef LANG_HOOKS_PRINT_TYPE 991#define LANG_HOOKS_PRINT_TYPE gnat_print_type 992#undef LANG_HOOKS_TYPE_MAX_SIZE 993#define LANG_HOOKS_TYPE_MAX_SIZE gnat_type_max_size 994#undef LANG_HOOKS_DECL_PRINTABLE_NAME 995#define LANG_HOOKS_DECL_PRINTABLE_NAME gnat_printable_name 996#undef LANG_HOOKS_DWARF_NAME 997#define LANG_HOOKS_DWARF_NAME gnat_dwarf_name 998#undef LANG_HOOKS_GIMPLIFY_EXPR 999#define LANG_HOOKS_GIMPLIFY_EXPR gnat_gimplify_expr 1000#undef LANG_HOOKS_TYPE_FOR_MODE 1001#define LANG_HOOKS_TYPE_FOR_MODE gnat_type_for_mode 1002#undef LANG_HOOKS_TYPE_FOR_SIZE 1003#define LANG_HOOKS_TYPE_FOR_SIZE gnat_type_for_size 1004#undef LANG_HOOKS_TYPES_COMPATIBLE_P 1005#define LANG_HOOKS_TYPES_COMPATIBLE_P gnat_types_compatible_p 1006#undef LANG_HOOKS_GET_ARRAY_DESCR_INFO 1007#define LANG_HOOKS_GET_ARRAY_DESCR_INFO gnat_get_array_descr_info 1008#undef LANG_HOOKS_GET_SUBRANGE_BOUNDS 1009#define LANG_HOOKS_GET_SUBRANGE_BOUNDS gnat_get_subrange_bounds 1010#undef LANG_HOOKS_DESCRIPTIVE_TYPE 1011#define LANG_HOOKS_DESCRIPTIVE_TYPE gnat_descriptive_type 1012#undef LANG_HOOKS_ATTRIBUTE_TABLE 1013#undef LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE 1014#define LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE gnat_enum_underlying_base_type 1015#define LANG_HOOKS_ATTRIBUTE_TABLE gnat_internal_attribute_table 1016#undef LANG_HOOKS_BUILTIN_FUNCTION 1017#define LANG_HOOKS_BUILTIN_FUNCTION gnat_builtin_function 1018#undef LANG_HOOKS_EH_PERSONALITY 1019#define LANG_HOOKS_EH_PERSONALITY gnat_eh_personality 1020#undef LANG_HOOKS_DEEP_UNSHARING 1021#define LANG_HOOKS_DEEP_UNSHARING true 1022#undef LANG_HOOKS_INIT_TS 1023#define LANG_HOOKS_INIT_TS gnat_init_ts 1024 1025struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER; 1026 1027#include "gt-ada-misc.h" 1028