1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2010, 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;
117 case OPT_Wmissing_prototypes:
118 case OPT_Wstrict_prototypes:
119 case OPT_Wwrite_strings:
121 case OPT_Wvariadic_macros:
122 case OPT_Wold_style_definition:
123 case OPT_Wmissing_format_attribute:
124 case OPT_Woverlength_strings:
125 /* These are used in the GCC Makefile. */
128 case OPT_feliminate_unused_debug_types:
129 /* We arrange for post_option to be able to only set the corresponding
130 flag to 1 when explicitly requested by the user. We expect the
131 default flag value to be either 0 or positive, and expose a positive
132 -f as a negative value to post_option. */
133 flag_eliminate_unused_debug_types = -value;
137 warning (0, "%<-gnat%> misspelled as %<-gant%>");
139 /* ... fall through ... */
147 /* These are handled by the front-end. */
157 /* Return language mask for option processing. */
160 gnat_option_lang_mask (void)
165 /* Initialize options structure OPTS. */
168 gnat_init_options_struct (struct gcc_options *opts)
170 /* Uninitialized really means uninitialized in Ada. */
171 opts->x_flag_zero_initialized_in_bss = 0;
174 /* Initialize for option processing. */
177 gnat_init_options (unsigned int decoded_options_count,
178 struct cl_decoded_option *decoded_options)
180 /* Reconstruct an argv array for use of back_end.adb.
182 ??? back_end.adb should not rely on this; instead, it should work with
183 decoded options without such reparsing, to ensure consistency in how
184 options are decoded. */
187 save_argv = XNEWVEC (const char *, 2 * decoded_options_count + 1);
189 for (i = 0; i < decoded_options_count; i++)
191 size_t num_elements = decoded_options[i].canonical_option_num_elements;
193 if (decoded_options[i].errors
194 || decoded_options[i].opt_index == OPT_SPECIAL_unknown
195 || num_elements == 0)
198 if (decoded_options[i].opt_index == OPT_I)
200 gcc_assert (num_elements == 2);
201 save_argv[save_argc++]
202 = concat (decoded_options[i].canonical_option[0],
203 decoded_options[i].canonical_option[1], NULL);
207 gcc_assert (num_elements >= 1 && num_elements <= 2);
208 save_argv[save_argc++] = decoded_options[i].canonical_option[0];
209 if (num_elements >= 2)
210 save_argv[save_argc++] = decoded_options[i].canonical_option[1];
213 save_argv[save_argc] = NULL;
215 gnat_argv = (char **) xmalloc (sizeof (save_argv[0]));
216 gnat_argv[0] = xstrdup (save_argv[0]); /* name of the command */
220 /* Ada code requires variables for these settings rather than elements
221 of the global_options structure. */
224 #undef flag_compare_debug
225 #undef flag_stack_check
228 int flag_compare_debug;
229 enum stack_check_type flag_stack_check = NO_STACK_CHECK;
231 /* Post-switch processing. */
234 gnat_post_options (const char **pfilename ATTRIBUTE_UNUSED)
236 /* Excess precision other than "fast" requires front-end
238 if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
239 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
240 sorry ("-fexcess-precision=standard for Ada");
241 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
243 /* ??? The warning machinery is outsmarted by Ada. */
244 warn_unused_parameter = 0;
246 /* No psABI change warnings for Ada. */
249 /* Force eliminate_unused_debug_types to 0 unless an explicit positive
250 -f has been passed. This forces the default to 0 for Ada, which might
251 differ from the common default. */
252 if (flag_eliminate_unused_debug_types < 0)
253 flag_eliminate_unused_debug_types = 1;
255 flag_eliminate_unused_debug_types = 0;
257 optimize = global_options.x_optimize;
258 optimize_size = global_options.x_optimize_size;
259 flag_compare_debug = global_options.x_flag_compare_debug;
260 flag_stack_check = global_options.x_flag_stack_check;
265 /* Here is the function to handle the compiler error processing in GCC. */
268 internal_error_function (diagnostic_context *context,
269 const char *msgid, va_list *ap)
272 char *buffer, *p, *loc;
273 String_Template temp, temp_loc;
274 Fat_Pointer fp, fp_loc;
277 /* Warn if plugins present. */
280 /* Reset the pretty-printer. */
281 pp_clear_output_area (context->printer);
283 /* Format the message into the pretty-printer. */
284 tinfo.format_spec = msgid;
286 tinfo.err_no = errno;
287 pp_format_verbatim (context->printer, &tinfo);
289 /* Extract a (writable) pointer to the formatted text. */
290 buffer = xstrdup (pp_formatted_text (context->printer));
292 /* Go up to the first newline. */
293 for (p = buffer; *p; p++)
301 temp.High_Bound = p - buffer;
305 s = expand_location (input_location);
306 if (context->show_column && s.column != 0)
307 asprintf (&loc, "%s:%d:%d", s.file, s.line, s.column);
309 asprintf (&loc, "%s:%d", s.file, s.line);
310 temp_loc.Low_Bound = 1;
311 temp_loc.High_Bound = strlen (loc);
312 fp_loc.Bounds = &temp_loc;
315 Current_Error_Node = error_gnat_node;
316 Compiler_Abort (fp, -1, fp_loc);
319 /* Perform all the initialization steps that are language-specific. */
324 /* Do little here, most of the standard declarations are set up after the
325 front-end has been run. Use the same `char' as C, this doesn't really
326 matter since we'll use the explicit `unsigned char' for Character. */
327 build_common_tree_nodes (flag_signed_char);
329 /* In Ada, we use the unsigned type corresponding to the width of Pmode as
330 SIZETYPE. In most cases when ptr_mode and Pmode differ, C will use the
331 width of ptr_mode for SIZETYPE, but we get better code using the width
332 of Pmode. Note that, although we manipulate negative offsets for some
333 internal constructs and rely on compile time overflow detection in size
334 computations, using unsigned types for SIZETYPEs is fine since they are
335 treated specially by the middle-end, in particular sign-extended. */
336 size_type_node = gnat_type_for_mode (Pmode, 1);
337 set_sizetype (size_type_node);
338 TYPE_NAME (sizetype) = get_identifier ("size_type");
340 /* In Ada, we use an unsigned 8-bit type for the default boolean type. */
341 boolean_type_node = make_unsigned_type (8);
342 TREE_SET_CODE (boolean_type_node, BOOLEAN_TYPE);
343 SET_TYPE_RM_MAX_VALUE (boolean_type_node,
344 build_int_cst (boolean_type_node, 1));
345 SET_TYPE_RM_SIZE (boolean_type_node, bitsize_int (1));
347 build_common_tree_nodes_2 (0);
348 sbitsize_one_node = sbitsize_int (1);
349 sbitsize_unit_node = sbitsize_int (BITS_PER_UNIT);
350 boolean_true_node = TYPE_MAX_VALUE (boolean_type_node);
352 ptr_void_type_node = build_pointer_type (void_type_node);
354 /* Show that REFERENCE_TYPEs are internal and should be Pmode. */
355 internal_reference_types ();
357 /* Register our internal error function. */
358 global_dc->internal_error = &internal_error_function;
363 /* If we are using the GCC mechanism to process exception handling, we
364 have to register the personality routine for Ada and to initialize
365 various language dependent hooks. */
368 gnat_init_gcc_eh (void)
370 #ifdef DWARF2_UNWIND_INFO
371 /* lang_dependent_init already called dwarf2out_frame_init if true. */
372 int dwarf2out_frame_initialized = dwarf2out_do_frame ();
375 /* We shouldn't do anything if the No_Exceptions_Handler pragma is set,
376 though. This could for instance lead to the emission of tables with
377 references to symbols (such as the Ada eh personality routine) within
378 libraries we won't link against. */
379 if (No_Exception_Handlers_Set ())
382 /* Tell GCC we are handling cleanup actions through exception propagation.
383 This opens possibilities that we don't take advantage of yet, but is
384 nonetheless necessary to ensure that fixup code gets assigned to the
385 right exception regions. */
386 using_eh_for_cleanups ();
388 /* Turn on -fexceptions and -fnon-call-exceptions. The first one triggers
389 the generation of the necessary exception tables. The second one is
390 useful for two reasons: 1/ we map some asynchronous signals like SEGV to
391 exceptions, so we need to ensure that the insns which can lead to such
392 signals are correctly attached to the exception region they pertain to,
393 2/ Some calls to pure subprograms are handled as libcall blocks and then
394 marked as "cannot trap" if the flag is not set (see emit_libcall_block).
395 We should not let this be since it is possible for such calls to actually
398 flag_non_call_exceptions = 1;
402 #ifdef DWARF2_UNWIND_INFO
403 if (!dwarf2out_frame_initialized && dwarf2out_do_frame ())
404 dwarf2out_frame_init ();
408 /* Print language-specific items in declaration NODE. */
411 gnat_print_decl (FILE *file, tree node, int indent)
413 switch (TREE_CODE (node))
416 print_node (file, "corresponding var",
417 DECL_CONST_CORRESPONDING_VAR (node), indent + 4);
421 print_node (file, "original field", DECL_ORIGINAL_FIELD (node),
426 print_node (file, "renamed object", DECL_RENAMED_OBJECT (node),
435 /* Print language-specific items in type NODE. */
438 gnat_print_type (FILE *file, tree node, int indent)
440 switch (TREE_CODE (node))
443 print_node (file, "ci/co list", TYPE_CI_CO_LIST (node), indent + 4);
447 if (TYPE_MODULAR_P (node))
448 print_node_brief (file, "modulus", TYPE_MODULUS (node), indent + 4);
449 else if (TYPE_HAS_ACTUAL_BOUNDS_P (node))
450 print_node (file, "actual bounds", TYPE_ACTUAL_BOUNDS (node),
452 else if (TYPE_VAX_FLOATING_POINT_P (node))
455 print_node (file, "index type", TYPE_INDEX_TYPE (node), indent + 4);
457 /* ... fall through ... */
461 print_node_brief (file, "RM size", TYPE_RM_SIZE (node), indent + 4);
463 /* ... fall through ... */
466 print_node_brief (file, "RM min", TYPE_RM_MIN_VALUE (node), indent + 4);
467 print_node_brief (file, "RM max", TYPE_RM_MAX_VALUE (node), indent + 4);
471 print_node (file,"actual bounds", TYPE_ACTUAL_BOUNDS (node), indent + 4);
475 print_node (file,"representative array",
476 TYPE_REPRESENTATIVE_ARRAY (node), indent + 4);
480 if (TYPE_FAT_POINTER_P (node) || TYPE_CONTAINS_TEMPLATE_P (node))
481 print_node (file, "unconstrained array",
482 TYPE_UNCONSTRAINED_ARRAY (node), indent + 4);
484 print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4);
488 case QUAL_UNION_TYPE:
489 print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4);
497 /* Return the name to be printed for DECL. */
500 gnat_printable_name (tree decl, int verbosity)
502 const char *coded_name = IDENTIFIER_POINTER (DECL_NAME (decl));
503 char *ada_name = (char *) ggc_alloc_atomic (strlen (coded_name) * 2 + 60);
505 __gnat_decode (coded_name, ada_name, 0);
507 if (verbosity == 2 && !DECL_IS_BUILTIN (decl))
509 Set_Identifier_Casing (ada_name, DECL_SOURCE_FILE (decl));
510 return ggc_strdup (Name_Buffer);
516 /* Return the name to be used in DWARF debug info for DECL. */
519 gnat_dwarf_name (tree decl, int verbosity ATTRIBUTE_UNUSED)
521 gcc_assert (DECL_P (decl));
522 return (const char *) IDENTIFIER_POINTER (DECL_NAME (decl));
525 /* Return true if types T1 and T2 are identical for type hashing purposes.
526 Called only after doing all language independent checks. At present,
527 this function is only called when both types are FUNCTION_TYPE. */
530 gnat_type_hash_eq (const_tree t1, const_tree t2)
532 gcc_assert (TREE_CODE (t1) == FUNCTION_TYPE);
533 return fntype_same_flags_p (t1, TYPE_CI_CO_LIST (t2),
534 TYPE_RETURN_UNCONSTRAINED_P (t2),
535 TYPE_RETURN_BY_DIRECT_REF_P (t2),
536 TREE_ADDRESSABLE (t2));
539 /* Do nothing (return the tree node passed). */
542 gnat_return_tree (tree t)
547 /* Get the alias set corresponding to a type or expression. */
549 static alias_set_type
550 gnat_get_alias_set (tree type)
552 /* If this is a padding type, use the type of the first field. */
553 if (TYPE_IS_PADDING_P (type))
554 return get_alias_set (TREE_TYPE (TYPE_FIELDS (type)));
556 /* If the type is an unconstrained array, use the type of the
557 self-referential array we make. */
558 else if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)
560 get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))));
562 /* If the type can alias any other types, return the alias set 0. */
563 else if (TYPE_P (type)
564 && TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (type)))
570 /* GNU_TYPE is a type. Return its maximum size in bytes, if known,
571 as a constant when possible. */
574 gnat_type_max_size (const_tree gnu_type)
576 /* First see what we can get from TYPE_SIZE_UNIT, which might not
577 be constant even for simple expressions if it has already been
578 elaborated and possibly replaced by a VAR_DECL. */
579 tree max_unitsize = max_size (TYPE_SIZE_UNIT (gnu_type), true);
581 /* If we don't have a constant, see what we can get from TYPE_ADA_SIZE,
582 which should stay untouched. */
583 if (!host_integerp (max_unitsize, 1)
584 && (TREE_CODE (gnu_type) == RECORD_TYPE
585 || TREE_CODE (gnu_type) == UNION_TYPE
586 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
587 && TYPE_ADA_SIZE (gnu_type))
589 tree max_adasize = max_size (TYPE_ADA_SIZE (gnu_type), true);
591 /* If we have succeeded in finding a constant, round it up to the
592 type's alignment and return the result in units. */
593 if (host_integerp (max_adasize, 1))
595 = size_binop (CEIL_DIV_EXPR,
596 round_up (max_adasize, TYPE_ALIGN (gnu_type)),
603 /* GNU_TYPE is a subtype of an integral type. Set LOWVAL to the low bound
604 and HIGHVAL to the high bound, respectively. */
607 gnat_get_subrange_bounds (const_tree gnu_type, tree *lowval, tree *highval)
609 *lowval = TYPE_MIN_VALUE (gnu_type);
610 *highval = TYPE_MAX_VALUE (gnu_type);
613 /* GNU_TYPE is the type of a subprogram parameter. Determine if it should be
614 passed by reference by default. */
617 default_pass_by_ref (tree gnu_type)
619 /* We pass aggregates by reference if they are sufficiently large. The
620 choice of constant here is somewhat arbitrary. We also pass by
621 reference if the target machine would either pass or return by
622 reference. Strictly speaking, we need only check the return if this
623 is an In Out parameter, but it's probably best to err on the side of
624 passing more things by reference. */
626 if (pass_by_reference (NULL, TYPE_MODE (gnu_type), gnu_type, true))
629 if (targetm.calls.return_in_memory (gnu_type, NULL_TREE))
632 if (AGGREGATE_TYPE_P (gnu_type)
633 && (!host_integerp (TYPE_SIZE (gnu_type), 1)
634 || 0 < compare_tree_int (TYPE_SIZE (gnu_type),
635 8 * TYPE_ALIGN (gnu_type))))
641 /* GNU_TYPE is the type of a subprogram parameter. Determine if it must be
642 passed by reference. */
645 must_pass_by_ref (tree gnu_type)
647 /* We pass only unconstrained objects, those required by the language
648 to be passed by reference, and objects of variable size. The latter
649 is more efficient, avoids problems with variable size temporaries,
650 and does not produce compatibility problems with C, since C does
651 not have such objects. */
652 return (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
653 || TREE_ADDRESSABLE (gnu_type)
654 || (TYPE_SIZE (gnu_type)
655 && TREE_CODE (TYPE_SIZE (gnu_type)) != INTEGER_CST));
658 /* Return the size of the FP mode with precision PREC. */
661 fp_prec_to_size (int prec)
663 enum machine_mode mode;
665 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
666 mode = GET_MODE_WIDER_MODE (mode))
667 if (GET_MODE_PRECISION (mode) == prec)
668 return GET_MODE_BITSIZE (mode);
673 /* Return the precision of the FP mode with size SIZE. */
676 fp_size_to_prec (int size)
678 enum machine_mode mode;
680 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
681 mode = GET_MODE_WIDER_MODE (mode))
682 if (GET_MODE_BITSIZE (mode) == size)
683 return GET_MODE_PRECISION (mode);
688 static GTY(()) tree gnat_eh_personality_decl;
690 /* Return the GNAT personality function decl. */
693 gnat_eh_personality (void)
695 if (!gnat_eh_personality_decl)
696 gnat_eh_personality_decl = build_personality_function ("gnat");
697 return gnat_eh_personality_decl;
700 /* Definitions for our language-specific hooks. */
702 #undef LANG_HOOKS_NAME
703 #define LANG_HOOKS_NAME "GNU Ada"
704 #undef LANG_HOOKS_IDENTIFIER_SIZE
705 #define LANG_HOOKS_IDENTIFIER_SIZE sizeof (struct tree_identifier)
706 #undef LANG_HOOKS_INIT
707 #define LANG_HOOKS_INIT gnat_init
708 #undef LANG_HOOKS_OPTION_LANG_MASK
709 #define LANG_HOOKS_OPTION_LANG_MASK gnat_option_lang_mask
710 #undef LANG_HOOKS_INIT_OPTIONS_STRUCT
711 #define LANG_HOOKS_INIT_OPTIONS_STRUCT gnat_init_options_struct
712 #undef LANG_HOOKS_INIT_OPTIONS
713 #define LANG_HOOKS_INIT_OPTIONS gnat_init_options
714 #undef LANG_HOOKS_HANDLE_OPTION
715 #define LANG_HOOKS_HANDLE_OPTION gnat_handle_option
716 #undef LANG_HOOKS_POST_OPTIONS
717 #define LANG_HOOKS_POST_OPTIONS gnat_post_options
718 #undef LANG_HOOKS_PARSE_FILE
719 #define LANG_HOOKS_PARSE_FILE gnat_parse_file
720 #undef LANG_HOOKS_TYPE_HASH_EQ
721 #define LANG_HOOKS_TYPE_HASH_EQ gnat_type_hash_eq
722 #undef LANG_HOOKS_GETDECLS
723 #define LANG_HOOKS_GETDECLS lhd_return_null_tree_v
724 #undef LANG_HOOKS_PUSHDECL
725 #define LANG_HOOKS_PUSHDECL gnat_return_tree
726 #undef LANG_HOOKS_WRITE_GLOBALS
727 #define LANG_HOOKS_WRITE_GLOBALS gnat_write_global_declarations
728 #undef LANG_HOOKS_GET_ALIAS_SET
729 #define LANG_HOOKS_GET_ALIAS_SET gnat_get_alias_set
730 #undef LANG_HOOKS_PRINT_DECL
731 #define LANG_HOOKS_PRINT_DECL gnat_print_decl
732 #undef LANG_HOOKS_PRINT_TYPE
733 #define LANG_HOOKS_PRINT_TYPE gnat_print_type
734 #undef LANG_HOOKS_TYPE_MAX_SIZE
735 #define LANG_HOOKS_TYPE_MAX_SIZE gnat_type_max_size
736 #undef LANG_HOOKS_DECL_PRINTABLE_NAME
737 #define LANG_HOOKS_DECL_PRINTABLE_NAME gnat_printable_name
738 #undef LANG_HOOKS_DWARF_NAME
739 #define LANG_HOOKS_DWARF_NAME gnat_dwarf_name
740 #undef LANG_HOOKS_GIMPLIFY_EXPR
741 #define LANG_HOOKS_GIMPLIFY_EXPR gnat_gimplify_expr
742 #undef LANG_HOOKS_TYPE_FOR_MODE
743 #define LANG_HOOKS_TYPE_FOR_MODE gnat_type_for_mode
744 #undef LANG_HOOKS_TYPE_FOR_SIZE
745 #define LANG_HOOKS_TYPE_FOR_SIZE gnat_type_for_size
746 #undef LANG_HOOKS_TYPES_COMPATIBLE_P
747 #define LANG_HOOKS_TYPES_COMPATIBLE_P gnat_types_compatible_p
748 #undef LANG_HOOKS_GET_SUBRANGE_BOUNDS
749 #define LANG_HOOKS_GET_SUBRANGE_BOUNDS gnat_get_subrange_bounds
750 #undef LANG_HOOKS_ATTRIBUTE_TABLE
751 #define LANG_HOOKS_ATTRIBUTE_TABLE gnat_internal_attribute_table
752 #undef LANG_HOOKS_BUILTIN_FUNCTION
753 #define LANG_HOOKS_BUILTIN_FUNCTION gnat_builtin_function
754 #undef LANG_HOOKS_EH_PERSONALITY
755 #define LANG_HOOKS_EH_PERSONALITY gnat_eh_personality
756 #undef LANG_HOOKS_DEEP_UNSHARING
757 #define LANG_HOOKS_DEEP_UNSHARING true
759 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
761 #include "gt-ada-misc.h"