1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2011, Free Software Foundation, Inc. *
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/>. *
21 * GNAT was originally developed by the GNAT team at New York University. *
22 * Extensive contributions were provided by Ada Core Technologies Inc. *
24 ****************************************************************************/
28 #include "coretypes.h"
31 #include "diagnostic.h"
37 #include "langhooks.h"
38 #include "langhooks-def.h"
42 #include "function.h" /* For pass_by_reference. */
45 #include "adadecode.h"
59 /* This symbol needs to be defined for the front-end. */
60 void *callgraph_info_file = NULL;
62 /* Command-line argc and argv. These variables are global since they are
63 imported in back_end.adb. */
64 unsigned int save_argc;
65 const char **save_argv;
67 /* GNAT argc and argv. */
69 extern char **gnat_argv;
71 /* Declare functions we use as part of startup. */
72 extern void __gnat_initialize (void *);
73 extern void __gnat_install_SEH_handler (void *);
74 extern void adainit (void);
75 extern void _ada_gnat1drv (void);
77 /* The parser for the language. For us, we process the GNAT tree. */
80 gnat_parse_file (void)
84 /* Call the target specific initializations. */
85 __gnat_initialize (NULL);
87 /* ??? Call the SEH initialization routine. This is to workaround
88 a bootstrap path problem. The call below should be removed at some
89 point and the SEH pointer passed to __gnat_initialize() above. */
90 __gnat_install_SEH_handler((void *)seh);
92 /* Call the front-end elaboration procedures. */
95 /* Call the front end. */
99 /* Decode all the language specific options that cannot be decoded by GCC.
100 The option decoding phase of GCC calls this routine on the flags that
101 are marked as Ada-specific. Return true on success or false on failure. */
104 gnat_handle_option (size_t scode, const char *arg ATTRIBUTE_UNUSED, int value,
105 int kind ATTRIBUTE_UNUSED, location_t loc ATTRIBUTE_UNUSED,
106 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
108 enum opt_code code = (enum opt_code) scode;
114 warn_uninitialized = value;
115 warn_maybe_uninitialized = value;
118 case OPT_Wmissing_prototypes:
119 case OPT_Wstrict_prototypes:
120 case OPT_Wwrite_strings:
122 case OPT_Wvariadic_macros:
123 case OPT_Wold_style_definition:
124 case OPT_Wmissing_format_attribute:
125 case OPT_Woverlength_strings:
126 /* These are used in the GCC Makefile. */
130 warning (0, "%<-gnat%> misspelled as %<-gant%>");
132 /* ... fall through ... */
140 /* These are handled by the front-end. */
150 /* Return language mask for option processing. */
153 gnat_option_lang_mask (void)
158 /* Initialize options structure OPTS. */
161 gnat_init_options_struct (struct gcc_options *opts)
163 /* Uninitialized really means uninitialized in Ada. */
164 opts->x_flag_zero_initialized_in_bss = 0;
167 /* Initialize for option processing. */
170 gnat_init_options (unsigned int decoded_options_count,
171 struct cl_decoded_option *decoded_options)
173 /* Reconstruct an argv array for use of back_end.adb.
175 ??? back_end.adb should not rely on this; instead, it should work with
176 decoded options without such reparsing, to ensure consistency in how
177 options are decoded. */
180 save_argv = XNEWVEC (const char *, 2 * decoded_options_count + 1);
182 for (i = 0; i < decoded_options_count; i++)
184 size_t num_elements = decoded_options[i].canonical_option_num_elements;
186 if (decoded_options[i].errors
187 || decoded_options[i].opt_index == OPT_SPECIAL_unknown
188 || num_elements == 0)
191 /* Deal with -I- specially since it must be a single switch. */
192 if (decoded_options[i].opt_index == OPT_I
194 && decoded_options[i].canonical_option[1][0] == '-'
195 && decoded_options[i].canonical_option[1][1] == '\0')
196 save_argv[save_argc++] = "-I-";
199 gcc_assert (num_elements >= 1 && num_elements <= 2);
200 save_argv[save_argc++] = decoded_options[i].canonical_option[0];
201 if (num_elements >= 2)
202 save_argv[save_argc++] = decoded_options[i].canonical_option[1];
205 save_argv[save_argc] = NULL;
207 gnat_argv = (char **) xmalloc (sizeof (save_argv[0]));
208 gnat_argv[0] = xstrdup (save_argv[0]); /* name of the command */
212 /* Ada code requires variables for these settings rather than elements
213 of the global_options structure. */
216 #undef flag_compare_debug
217 #undef flag_stack_check
220 int flag_compare_debug;
221 enum stack_check_type flag_stack_check = NO_STACK_CHECK;
223 /* Post-switch processing. */
226 gnat_post_options (const char **pfilename ATTRIBUTE_UNUSED)
228 /* Excess precision other than "fast" requires front-end support. */
229 if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
230 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
231 sorry ("-fexcess-precision=standard for Ada");
232 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
234 /* ??? The warning machinery is outsmarted by Ada. */
235 warn_unused_parameter = 0;
237 /* No psABI change warnings for Ada. */
240 optimize = global_options.x_optimize;
241 optimize_size = global_options.x_optimize_size;
242 flag_compare_debug = global_options.x_flag_compare_debug;
243 flag_stack_check = global_options.x_flag_stack_check;
248 /* Here is the function to handle the compiler error processing in GCC. */
251 internal_error_function (diagnostic_context *context,
252 const char *msgid, va_list *ap)
255 char *buffer, *p, *loc;
256 String_Template temp, temp_loc;
257 Fat_Pointer fp, fp_loc;
260 /* Warn if plugins present. */
263 /* Reset the pretty-printer. */
264 pp_clear_output_area (context->printer);
266 /* Format the message into the pretty-printer. */
267 tinfo.format_spec = msgid;
269 tinfo.err_no = errno;
270 pp_format_verbatim (context->printer, &tinfo);
272 /* Extract a (writable) pointer to the formatted text. */
273 buffer = xstrdup (pp_formatted_text (context->printer));
275 /* Go up to the first newline. */
276 for (p = buffer; *p; p++)
284 temp.High_Bound = p - buffer;
288 s = expand_location (input_location);
289 if (context->show_column && s.column != 0)
290 asprintf (&loc, "%s:%d:%d", s.file, s.line, s.column);
292 asprintf (&loc, "%s:%d", s.file, s.line);
293 temp_loc.Low_Bound = 1;
294 temp_loc.High_Bound = strlen (loc);
295 fp_loc.Bounds = &temp_loc;
298 Current_Error_Node = error_gnat_node;
299 Compiler_Abort (fp, -1, fp_loc);
302 /* Perform all the initialization steps that are language-specific. */
307 /* Do little here, most of the standard declarations are set up after the
308 front-end has been run. Use the same `char' as C, this doesn't really
309 matter since we'll use the explicit `unsigned char' for Character. */
310 build_common_tree_nodes (flag_signed_char, false);
312 /* In Ada, we use an unsigned 8-bit type for the default boolean type. */
313 boolean_type_node = make_unsigned_type (8);
314 TREE_SET_CODE (boolean_type_node, BOOLEAN_TYPE);
315 SET_TYPE_RM_MAX_VALUE (boolean_type_node,
316 build_int_cst (boolean_type_node, 1));
317 SET_TYPE_RM_SIZE (boolean_type_node, bitsize_int (1));
318 boolean_true_node = TYPE_MAX_VALUE (boolean_type_node);
319 boolean_false_node = TYPE_MIN_VALUE (boolean_type_node);
321 sbitsize_one_node = sbitsize_int (1);
322 sbitsize_unit_node = sbitsize_int (BITS_PER_UNIT);
324 ptr_void_type_node = build_pointer_type (void_type_node);
326 /* Show that REFERENCE_TYPEs are internal and should be Pmode. */
327 internal_reference_types ();
329 /* Register our internal error function. */
330 global_dc->internal_error = &internal_error_function;
335 /* If we are using the GCC mechanism to process exception handling, we
336 have to register the personality routine for Ada and to initialize
337 various language dependent hooks. */
340 gnat_init_gcc_eh (void)
342 /* We shouldn't do anything if the No_Exceptions_Handler pragma is set,
343 though. This could for instance lead to the emission of tables with
344 references to symbols (such as the Ada eh personality routine) within
345 libraries we won't link against. */
346 if (No_Exception_Handlers_Set ())
349 /* Tell GCC we are handling cleanup actions through exception propagation.
350 This opens possibilities that we don't take advantage of yet, but is
351 nonetheless necessary to ensure that fixup code gets assigned to the
352 right exception regions. */
353 using_eh_for_cleanups ();
355 /* Turn on -fexceptions and -fnon-call-exceptions. The first one triggers
356 the generation of the necessary exception tables. The second one is
357 useful for two reasons: 1/ we map some asynchronous signals like SEGV to
358 exceptions, so we need to ensure that the insns which can lead to such
359 signals are correctly attached to the exception region they pertain to,
360 2/ Some calls to pure subprograms are handled as libcall blocks and then
361 marked as "cannot trap" if the flag is not set (see emit_libcall_block).
362 We should not let this be since it is possible for such calls to actually
365 flag_non_call_exceptions = 1;
370 /* Print language-specific items in declaration NODE. */
373 gnat_print_decl (FILE *file, tree node, int indent)
375 switch (TREE_CODE (node))
378 print_node (file, "corresponding var",
379 DECL_CONST_CORRESPONDING_VAR (node), indent + 4);
383 print_node (file, "original field", DECL_ORIGINAL_FIELD (node),
388 print_node (file, "renamed object", DECL_RENAMED_OBJECT (node),
397 /* Print language-specific items in type NODE. */
400 gnat_print_type (FILE *file, tree node, int indent)
402 switch (TREE_CODE (node))
405 print_node (file, "ci/co list", TYPE_CI_CO_LIST (node), indent + 4);
409 if (TYPE_MODULAR_P (node))
410 print_node_brief (file, "modulus", TYPE_MODULUS (node), indent + 4);
411 else if (TYPE_HAS_ACTUAL_BOUNDS_P (node))
412 print_node (file, "actual bounds", TYPE_ACTUAL_BOUNDS (node),
414 else if (TYPE_VAX_FLOATING_POINT_P (node))
417 print_node (file, "index type", TYPE_INDEX_TYPE (node), indent + 4);
419 /* ... fall through ... */
423 print_node_brief (file, "RM size", TYPE_RM_SIZE (node), indent + 4);
425 /* ... fall through ... */
428 print_node_brief (file, "RM min", TYPE_RM_MIN_VALUE (node), indent + 4);
429 print_node_brief (file, "RM max", TYPE_RM_MAX_VALUE (node), indent + 4);
433 print_node (file,"actual bounds", TYPE_ACTUAL_BOUNDS (node), indent + 4);
437 print_node (file,"representative array",
438 TYPE_REPRESENTATIVE_ARRAY (node), indent + 4);
442 if (TYPE_FAT_POINTER_P (node) || TYPE_CONTAINS_TEMPLATE_P (node))
443 print_node (file, "unconstrained array",
444 TYPE_UNCONSTRAINED_ARRAY (node), indent + 4);
446 print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4);
450 case QUAL_UNION_TYPE:
451 print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4);
459 /* Return the name to be printed for DECL. */
462 gnat_printable_name (tree decl, int verbosity)
464 const char *coded_name = IDENTIFIER_POINTER (DECL_NAME (decl));
465 char *ada_name = (char *) ggc_alloc_atomic (strlen (coded_name) * 2 + 60);
467 __gnat_decode (coded_name, ada_name, 0);
469 if (verbosity == 2 && !DECL_IS_BUILTIN (decl))
471 Set_Identifier_Casing (ada_name, DECL_SOURCE_FILE (decl));
472 return ggc_strdup (Name_Buffer);
478 /* Return the name to be used in DWARF debug info for DECL. */
481 gnat_dwarf_name (tree decl, int verbosity ATTRIBUTE_UNUSED)
483 gcc_assert (DECL_P (decl));
484 return (const char *) IDENTIFIER_POINTER (DECL_NAME (decl));
487 /* Return the descriptive type associated with TYPE, if any. */
490 gnat_descriptive_type (const_tree type)
492 if (TYPE_STUB_DECL (type))
493 return DECL_PARALLEL_TYPE (TYPE_STUB_DECL (type));
498 /* Return true if types T1 and T2 are identical for type hashing purposes.
499 Called only after doing all language independent checks. At present,
500 this function is only called when both types are FUNCTION_TYPE. */
503 gnat_type_hash_eq (const_tree t1, const_tree t2)
505 gcc_assert (TREE_CODE (t1) == FUNCTION_TYPE);
506 return fntype_same_flags_p (t1, TYPE_CI_CO_LIST (t2),
507 TYPE_RETURN_UNCONSTRAINED_P (t2),
508 TYPE_RETURN_BY_DIRECT_REF_P (t2),
509 TREE_ADDRESSABLE (t2));
512 /* Do nothing (return the tree node passed). */
515 gnat_return_tree (tree t)
520 /* Get the alias set corresponding to a type or expression. */
522 static alias_set_type
523 gnat_get_alias_set (tree type)
525 /* If this is a padding type, use the type of the first field. */
526 if (TYPE_IS_PADDING_P (type))
527 return get_alias_set (TREE_TYPE (TYPE_FIELDS (type)));
529 /* If the type is an unconstrained array, use the type of the
530 self-referential array we make. */
531 else if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)
533 get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))));
535 /* If the type can alias any other types, return the alias set 0. */
536 else if (TYPE_P (type)
537 && TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (type)))
543 /* GNU_TYPE is a type. Return its maximum size in bytes, if known,
544 as a constant when possible. */
547 gnat_type_max_size (const_tree gnu_type)
549 /* First see what we can get from TYPE_SIZE_UNIT, which might not
550 be constant even for simple expressions if it has already been
551 elaborated and possibly replaced by a VAR_DECL. */
552 tree max_unitsize = max_size (TYPE_SIZE_UNIT (gnu_type), true);
554 /* If we don't have a constant, see what we can get from TYPE_ADA_SIZE,
555 which should stay untouched. */
556 if (!host_integerp (max_unitsize, 1)
557 && (TREE_CODE (gnu_type) == RECORD_TYPE
558 || TREE_CODE (gnu_type) == UNION_TYPE
559 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
560 && TYPE_ADA_SIZE (gnu_type))
562 tree max_adasize = max_size (TYPE_ADA_SIZE (gnu_type), true);
564 /* If we have succeeded in finding a constant, round it up to the
565 type's alignment and return the result in units. */
566 if (host_integerp (max_adasize, 1))
568 = size_binop (CEIL_DIV_EXPR,
569 round_up (max_adasize, TYPE_ALIGN (gnu_type)),
576 /* GNU_TYPE is a subtype of an integral type. Set LOWVAL to the low bound
577 and HIGHVAL to the high bound, respectively. */
580 gnat_get_subrange_bounds (const_tree gnu_type, tree *lowval, tree *highval)
582 *lowval = TYPE_MIN_VALUE (gnu_type);
583 *highval = TYPE_MAX_VALUE (gnu_type);
586 /* GNU_TYPE is the type of a subprogram parameter. Determine if it should be
587 passed by reference by default. */
590 default_pass_by_ref (tree gnu_type)
592 /* We pass aggregates by reference if they are sufficiently large. The
593 choice of constant here is somewhat arbitrary. We also pass by
594 reference if the target machine would either pass or return by
595 reference. Strictly speaking, we need only check the return if this
596 is an In Out parameter, but it's probably best to err on the side of
597 passing more things by reference. */
599 if (pass_by_reference (NULL, TYPE_MODE (gnu_type), gnu_type, true))
602 if (targetm.calls.return_in_memory (gnu_type, NULL_TREE))
605 if (AGGREGATE_TYPE_P (gnu_type)
606 && (!host_integerp (TYPE_SIZE (gnu_type), 1)
607 || 0 < compare_tree_int (TYPE_SIZE (gnu_type),
608 8 * TYPE_ALIGN (gnu_type))))
614 /* GNU_TYPE is the type of a subprogram parameter. Determine if it must be
615 passed by reference. */
618 must_pass_by_ref (tree gnu_type)
620 /* We pass only unconstrained objects, those required by the language
621 to be passed by reference, and objects of variable size. The latter
622 is more efficient, avoids problems with variable size temporaries,
623 and does not produce compatibility problems with C, since C does
624 not have such objects. */
625 return (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
626 || TREE_ADDRESSABLE (gnu_type)
627 || (TYPE_SIZE (gnu_type)
628 && TREE_CODE (TYPE_SIZE (gnu_type)) != INTEGER_CST));
631 /* Return the size of the FP mode with precision PREC. */
634 fp_prec_to_size (int prec)
636 enum machine_mode mode;
638 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
639 mode = GET_MODE_WIDER_MODE (mode))
640 if (GET_MODE_PRECISION (mode) == prec)
641 return GET_MODE_BITSIZE (mode);
646 /* Return the precision of the FP mode with size SIZE. */
649 fp_size_to_prec (int size)
651 enum machine_mode mode;
653 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
654 mode = GET_MODE_WIDER_MODE (mode))
655 if (GET_MODE_BITSIZE (mode) == size)
656 return GET_MODE_PRECISION (mode);
661 static GTY(()) tree gnat_eh_personality_decl;
663 /* Return the GNAT personality function decl. */
666 gnat_eh_personality (void)
668 if (!gnat_eh_personality_decl)
669 gnat_eh_personality_decl = build_personality_function ("gnat");
670 return gnat_eh_personality_decl;
673 /* Initialize language-specific bits of tree_contains_struct. */
678 MARK_TS_COMMON (UNCONSTRAINED_ARRAY_TYPE);
680 MARK_TS_TYPED (UNCONSTRAINED_ARRAY_REF);
681 MARK_TS_TYPED (NULL_EXPR);
682 MARK_TS_TYPED (PLUS_NOMOD_EXPR);
683 MARK_TS_TYPED (MINUS_NOMOD_EXPR);
684 MARK_TS_TYPED (ATTR_ADDR_EXPR);
685 MARK_TS_TYPED (STMT_STMT);
686 MARK_TS_TYPED (LOOP_STMT);
687 MARK_TS_TYPED (EXIT_STMT);
690 /* Definitions for our language-specific hooks. */
692 #undef LANG_HOOKS_NAME
693 #define LANG_HOOKS_NAME "GNU Ada"
694 #undef LANG_HOOKS_IDENTIFIER_SIZE
695 #define LANG_HOOKS_IDENTIFIER_SIZE sizeof (struct tree_identifier)
696 #undef LANG_HOOKS_INIT
697 #define LANG_HOOKS_INIT gnat_init
698 #undef LANG_HOOKS_OPTION_LANG_MASK
699 #define LANG_HOOKS_OPTION_LANG_MASK gnat_option_lang_mask
700 #undef LANG_HOOKS_INIT_OPTIONS_STRUCT
701 #define LANG_HOOKS_INIT_OPTIONS_STRUCT gnat_init_options_struct
702 #undef LANG_HOOKS_INIT_OPTIONS
703 #define LANG_HOOKS_INIT_OPTIONS gnat_init_options
704 #undef LANG_HOOKS_HANDLE_OPTION
705 #define LANG_HOOKS_HANDLE_OPTION gnat_handle_option
706 #undef LANG_HOOKS_POST_OPTIONS
707 #define LANG_HOOKS_POST_OPTIONS gnat_post_options
708 #undef LANG_HOOKS_PARSE_FILE
709 #define LANG_HOOKS_PARSE_FILE gnat_parse_file
710 #undef LANG_HOOKS_TYPE_HASH_EQ
711 #define LANG_HOOKS_TYPE_HASH_EQ gnat_type_hash_eq
712 #undef LANG_HOOKS_GETDECLS
713 #define LANG_HOOKS_GETDECLS lhd_return_null_tree_v
714 #undef LANG_HOOKS_PUSHDECL
715 #define LANG_HOOKS_PUSHDECL gnat_return_tree
716 #undef LANG_HOOKS_WRITE_GLOBALS
717 #define LANG_HOOKS_WRITE_GLOBALS gnat_write_global_declarations
718 #undef LANG_HOOKS_GET_ALIAS_SET
719 #define LANG_HOOKS_GET_ALIAS_SET gnat_get_alias_set
720 #undef LANG_HOOKS_PRINT_DECL
721 #define LANG_HOOKS_PRINT_DECL gnat_print_decl
722 #undef LANG_HOOKS_PRINT_TYPE
723 #define LANG_HOOKS_PRINT_TYPE gnat_print_type
724 #undef LANG_HOOKS_TYPE_MAX_SIZE
725 #define LANG_HOOKS_TYPE_MAX_SIZE gnat_type_max_size
726 #undef LANG_HOOKS_DECL_PRINTABLE_NAME
727 #define LANG_HOOKS_DECL_PRINTABLE_NAME gnat_printable_name
728 #undef LANG_HOOKS_DWARF_NAME
729 #define LANG_HOOKS_DWARF_NAME gnat_dwarf_name
730 #undef LANG_HOOKS_GIMPLIFY_EXPR
731 #define LANG_HOOKS_GIMPLIFY_EXPR gnat_gimplify_expr
732 #undef LANG_HOOKS_TYPE_FOR_MODE
733 #define LANG_HOOKS_TYPE_FOR_MODE gnat_type_for_mode
734 #undef LANG_HOOKS_TYPE_FOR_SIZE
735 #define LANG_HOOKS_TYPE_FOR_SIZE gnat_type_for_size
736 #undef LANG_HOOKS_TYPES_COMPATIBLE_P
737 #define LANG_HOOKS_TYPES_COMPATIBLE_P gnat_types_compatible_p
738 #undef LANG_HOOKS_GET_SUBRANGE_BOUNDS
739 #define LANG_HOOKS_GET_SUBRANGE_BOUNDS gnat_get_subrange_bounds
740 #undef LANG_HOOKS_DESCRIPTIVE_TYPE
741 #define LANG_HOOKS_DESCRIPTIVE_TYPE gnat_descriptive_type
742 #undef LANG_HOOKS_ATTRIBUTE_TABLE
743 #define LANG_HOOKS_ATTRIBUTE_TABLE gnat_internal_attribute_table
744 #undef LANG_HOOKS_BUILTIN_FUNCTION
745 #define LANG_HOOKS_BUILTIN_FUNCTION gnat_builtin_function
746 #undef LANG_HOOKS_EH_PERSONALITY
747 #define LANG_HOOKS_EH_PERSONALITY gnat_eh_personality
748 #undef LANG_HOOKS_DEEP_UNSHARING
749 #define LANG_HOOKS_DEEP_UNSHARING true
750 #undef LANG_HOOKS_INIT_TS
751 #define LANG_HOOKS_INIT_TS gnat_init_ts
753 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
755 #include "gt-ada-misc.h"