1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2008, 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 2, 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 COPYING. If not, write *
19 * to the Free Software Foundation, 51 Franklin Street, Fifth Floor, *
20 * Boston, MA 02110-1301, USA. *
22 * As a special exception, if you link this file with other files to *
23 * produce an executable, this file does not by itself cause the resulting *
24 * executable to be covered by the GNU General Public License. This except- *
25 * ion does not however invalidate any other reasons why the executable *
26 * file might be covered by the GNU Public License. *
28 * GNAT was originally developed by the GNAT team at New York University. *
29 * Extensive contributions were provided by Ada Core Technologies Inc. *
31 ****************************************************************************/
33 /* This file contains parts of the compiler that are required for interfacing
34 with GCC but otherwise do nothing and parts of Gigi that need to know
39 #include "coretypes.h"
44 #include "diagnostic.h"
51 #include "tree-inline.h"
52 #include "insn-codes.h"
53 #include "insn-flags.h"
54 #include "insn-config.h"
61 #include "langhooks.h"
62 #include "langhooks-def.h"
78 #include "adadecode.h"
82 extern FILE *asm_out_file;
84 /* The largest alignment, in bits, that is needed for using the widest
86 unsigned int largest_move_alignment;
88 static bool gnat_init (void);
89 static void gnat_finish_incomplete_decl (tree);
90 static unsigned int gnat_init_options (unsigned int, const char **);
91 static int gnat_handle_option (size_t, const char *, int);
92 static bool gnat_post_options (const char **);
93 static alias_set_type gnat_get_alias_set (tree);
94 static void gnat_print_decl (FILE *, tree, int);
95 static void gnat_print_type (FILE *, tree, int);
96 static const char *gnat_printable_name (tree, int);
97 static const char *gnat_dwarf_name (tree, int);
98 static tree gnat_return_tree (tree);
99 static int gnat_eh_type_covers (tree, tree);
100 static void gnat_parse_file (int);
101 static rtx gnat_expand_expr (tree, rtx, enum machine_mode, int,
103 static void internal_error_function (const char *, va_list *);
104 static tree gnat_type_max_size (const_tree);
106 /* Definitions for our language-specific hooks. */
108 #undef LANG_HOOKS_NAME
109 #define LANG_HOOKS_NAME "GNU Ada"
110 #undef LANG_HOOKS_IDENTIFIER_SIZE
111 #define LANG_HOOKS_IDENTIFIER_SIZE sizeof (struct tree_identifier)
112 #undef LANG_HOOKS_INIT
113 #define LANG_HOOKS_INIT gnat_init
114 #undef LANG_HOOKS_INIT_OPTIONS
115 #define LANG_HOOKS_INIT_OPTIONS gnat_init_options
116 #undef LANG_HOOKS_HANDLE_OPTION
117 #define LANG_HOOKS_HANDLE_OPTION gnat_handle_option
118 #undef LANG_HOOKS_POST_OPTIONS
119 #define LANG_HOOKS_POST_OPTIONS gnat_post_options
120 #undef LANG_HOOKS_PARSE_FILE
121 #define LANG_HOOKS_PARSE_FILE gnat_parse_file
122 #undef LANG_HOOKS_HASH_TYPES
123 #define LANG_HOOKS_HASH_TYPES false
124 #undef LANG_HOOKS_GETDECLS
125 #define LANG_HOOKS_GETDECLS lhd_return_null_tree_v
126 #undef LANG_HOOKS_PUSHDECL
127 #define LANG_HOOKS_PUSHDECL gnat_return_tree
128 #undef LANG_HOOKS_WRITE_GLOBALS
129 #define LANG_HOOKS_WRITE_GLOBALS gnat_write_global_declarations
130 #undef LANG_HOOKS_FINISH_INCOMPLETE_DECL
131 #define LANG_HOOKS_FINISH_INCOMPLETE_DECL gnat_finish_incomplete_decl
132 #undef LANG_HOOKS_GET_ALIAS_SET
133 #define LANG_HOOKS_GET_ALIAS_SET gnat_get_alias_set
134 #undef LANG_HOOKS_EXPAND_EXPR
135 #define LANG_HOOKS_EXPAND_EXPR gnat_expand_expr
136 #undef LANG_HOOKS_MARK_ADDRESSABLE
137 #define LANG_HOOKS_MARK_ADDRESSABLE gnat_mark_addressable
138 #undef LANG_HOOKS_PRINT_DECL
139 #define LANG_HOOKS_PRINT_DECL gnat_print_decl
140 #undef LANG_HOOKS_PRINT_TYPE
141 #define LANG_HOOKS_PRINT_TYPE gnat_print_type
142 #undef LANG_HOOKS_TYPE_MAX_SIZE
143 #define LANG_HOOKS_TYPE_MAX_SIZE gnat_type_max_size
144 #undef LANG_HOOKS_DECL_PRINTABLE_NAME
145 #define LANG_HOOKS_DECL_PRINTABLE_NAME gnat_printable_name
146 #undef LANG_HOOKS_DWARF_NAME
147 #define LANG_HOOKS_DWARF_NAME gnat_dwarf_name
148 #undef LANG_HOOKS_GIMPLIFY_EXPR
149 #define LANG_HOOKS_GIMPLIFY_EXPR gnat_gimplify_expr
150 #undef LANG_HOOKS_TYPE_FOR_MODE
151 #define LANG_HOOKS_TYPE_FOR_MODE gnat_type_for_mode
152 #undef LANG_HOOKS_TYPE_FOR_SIZE
153 #define LANG_HOOKS_TYPE_FOR_SIZE gnat_type_for_size
154 #undef LANG_HOOKS_TYPES_COMPATIBLE_P
155 #define LANG_HOOKS_TYPES_COMPATIBLE_P gnat_types_compatible_p
156 #undef LANG_HOOKS_ATTRIBUTE_TABLE
157 #define LANG_HOOKS_ATTRIBUTE_TABLE gnat_internal_attribute_table
158 #undef LANG_HOOKS_BUILTIN_FUNCTION
159 #define LANG_HOOKS_BUILTIN_FUNCTION gnat_builtin_function
161 const struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
163 /* Tables describing GCC tree codes used only by GNAT.
165 Table indexed by tree code giving a string containing a character
166 classifying the tree code. Possibilities are
167 t, d, s, c, r, <, 1 and 2. See cp-tree.def for details. */
169 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
171 const enum tree_code_class tree_code_type[] = {
174 #include "ada-tree.def"
178 /* Table indexed by tree code giving number of expression
179 operands beyond the fixed part of the node structure.
180 Not used for types or decls. */
182 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
184 const unsigned char tree_code_length[] = {
187 #include "ada-tree.def"
191 /* Names of tree components.
192 Used for printing out the tree and error messages. */
193 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
195 const char *const tree_code_name[] = {
198 #include "ada-tree.def"
202 /* Command-line argc and argv.
203 These variables are global, since they are imported and used in
206 unsigned int save_argc;
207 const char **save_argv;
209 /* gnat standard argc argv */
211 extern int gnat_argc;
212 extern char **gnat_argv;
215 /* Declare functions we use as part of startup. */
216 extern void __gnat_initialize (void *);
217 extern void __gnat_install_SEH_handler (void *);
218 extern void adainit (void);
219 extern void _ada_gnat1drv (void);
221 /* The parser for the language. For us, we process the GNAT tree. */
224 gnat_parse_file (int set_yydebug ATTRIBUTE_UNUSED)
228 /* Call the target specific initializations. */
229 __gnat_initialize (NULL);
231 /* ??? Call the SEH initialization routine. This is to workaround
232 a bootstrap path problem. The call below should be removed at some
233 point and the SEH pointer passed to __gnat_initialize() above. */
234 __gnat_install_SEH_handler((void *)seh);
236 /* Call the front-end elaboration procedures. */
239 /* Call the front end. */
242 /* We always have a single compilation unit in Ada. */
243 cgraph_finalize_compilation_unit ();
246 /* Decode all the language specific options that cannot be decoded by GCC.
247 The option decoding phase of GCC calls this routine on the flags that
248 it cannot decode. This routine returns the number of consecutive arguments
249 from ARGV that it successfully decoded; 0 indicates failure. */
252 gnat_handle_option (size_t scode, const char *arg, int value)
254 const struct cl_option *option = &cl_options[scode];
255 enum opt_code code = (enum opt_code) scode;
258 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
260 error ("missing argument to \"-%s\"", option->opt_text);
267 q = xmalloc (sizeof("-I") + strlen (arg));
270 gnat_argv[gnat_argc] = q;
277 /* We save the value of warn_uninitialized, since if they put
278 -Wuninitialized on the command line, we need to generate a
279 warning about not using it without also specifying -O. */
280 if (warn_uninitialized != 1)
281 warn_uninitialized = (value ? 2 : 0);
284 /* These are used in the GCC Makefile. */
285 case OPT_Wmissing_prototypes:
286 case OPT_Wstrict_prototypes:
287 case OPT_Wwrite_strings:
289 case OPT_Wvariadic_macros:
290 case OPT_Wold_style_definition:
291 case OPT_Wmissing_format_attribute:
292 case OPT_Woverlength_strings:
295 /* This is handled by the front-end. */
300 gnat_argv[gnat_argc] = xstrdup ("-nostdlib");
304 case OPT_feliminate_unused_debug_types:
305 /* We arrange for post_option to be able to only set the corresponding
306 flag to 1 when explicitly requested by the user. We expect the
307 default flag value to be either 0 or positive, and expose a positive
308 -f as a negative value to post_option. */
309 flag_eliminate_unused_debug_types = -value;
313 gnat_argv[gnat_argc] = xstrdup ("-fRTS");
318 warning (0, "%<-gnat%> misspelled as %<-gant%>");
320 /* ... fall through ... */
323 /* Recopy the switches without the 'gnat' prefix. */
324 gnat_argv[gnat_argc] = xmalloc (strlen (arg) + 2);
325 gnat_argv[gnat_argc][0] = '-';
326 strcpy (gnat_argv[gnat_argc] + 1, arg);
331 gnat_argv[gnat_argc] = xstrdup ("-O");
333 gnat_argv[gnat_argc] = xstrdup (arg);
344 /* Initialize for option processing. */
347 gnat_init_options (unsigned int argc, const char **argv)
349 /* Initialize gnat_argv with save_argv size. */
350 gnat_argv = (char **) xmalloc ((argc + 1) * sizeof (argv[0]));
351 gnat_argv[0] = xstrdup (argv[0]); /* name of the command */
357 /* Uninitialized really means uninitialized in Ada. */
358 flag_zero_initialized_in_bss = 0;
363 /* Post-switch processing. */
366 gnat_post_options (const char **pfilename ATTRIBUTE_UNUSED)
368 /* ??? The warning machinery is outsmarted by Ada. */
369 warn_unused_parameter = 0;
371 flag_inline_trees = 1;
375 if (flag_inline_functions)
376 flag_inline_trees = 2;
378 /* Force eliminate_unused_debug_types to 0 unless an explicit positive
379 -f has been passed. This forces the default to 0 for Ada, which might
380 differ from the common default. */
381 if (flag_eliminate_unused_debug_types < 0)
382 flag_eliminate_unused_debug_types = 1;
384 flag_eliminate_unused_debug_types = 0;
389 /* Here is the function to handle the compiler error processing in GCC. */
392 internal_error_function (const char *msgid, va_list *ap)
395 char *buffer, *p, *loc;
396 String_Template temp, temp_loc;
397 Fat_Pointer fp, fp_loc;
400 /* Reset the pretty-printer. */
401 pp_clear_output_area (global_dc->printer);
403 /* Format the message into the pretty-printer. */
404 tinfo.format_spec = msgid;
406 tinfo.err_no = errno;
407 pp_format_verbatim (global_dc->printer, &tinfo);
409 /* Extract a (writable) pointer to the formatted text. */
410 buffer = (char*) pp_formatted_text (global_dc->printer);
412 /* Go up to the first newline. */
413 for (p = buffer; *p; p++)
421 temp.High_Bound = p - buffer;
425 s = expand_location (input_location);
426 if (flag_show_column && s.column != 0)
427 asprintf (&loc, "%s:%d:%d", s.file, s.line, s.column);
429 asprintf (&loc, "%s:%d", s.file, s.line);
430 temp_loc.Low_Bound = 1;
431 temp_loc.High_Bound = strlen (loc);
432 fp_loc.Bounds = &temp_loc;
435 Current_Error_Node = error_gnat_node;
436 Compiler_Abort (fp, -1, fp_loc);
439 /* Perform all the initialization steps that are language-specific. */
444 /* Performs whatever initialization steps needed by the language-dependent
446 gnat_init_decl_processing ();
448 /* Add the input filename as the last argument. */
449 gnat_argv[gnat_argc] = (char *) main_input_filename;
451 gnat_argv[gnat_argc] = 0;
453 global_dc->internal_error = &internal_error_function;
455 /* Show that REFERENCE_TYPEs are internal and should be Pmode. */
456 internal_reference_types ();
461 /* This function is called indirectly from toplev.c to handle incomplete
462 declarations, i.e. VAR_DECL nodes whose DECL_SIZE is zero. To be precise,
463 compile_file in toplev.c makes an indirect call through the function pointer
464 incomplete_decl_finalize_hook which is initialized to this routine in
465 init_decl_processing. */
468 gnat_finish_incomplete_decl (tree dont_care ATTRIBUTE_UNUSED)
473 /* Compute the alignment of the largest mode that can be used for copying
477 gnat_compute_largest_alignment (void)
479 enum machine_mode mode;
481 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
482 mode = GET_MODE_WIDER_MODE (mode))
483 if (optab_handler (mov_optab, mode)->insn_code != CODE_FOR_nothing)
484 largest_move_alignment = MIN (BIGGEST_ALIGNMENT,
485 MAX (largest_move_alignment,
486 GET_MODE_ALIGNMENT (mode)));
489 /* If we are using the GCC mechanism to process exception handling, we
490 have to register the personality routine for Ada and to initialize
491 various language dependent hooks. */
494 gnat_init_gcc_eh (void)
496 #ifdef DWARF2_UNWIND_INFO
497 /* lang_dependent_init already called dwarf2out_frame_init if true. */
498 int dwarf2out_frame_initialized = dwarf2out_do_frame ();
501 /* We shouldn't do anything if the No_Exceptions_Handler pragma is set,
502 though. This could for instance lead to the emission of tables with
503 references to symbols (such as the Ada eh personality routine) within
504 libraries we won't link against. */
505 if (No_Exception_Handlers_Set ())
508 /* Tell GCC we are handling cleanup actions through exception propagation.
509 This opens possibilities that we don't take advantage of yet, but is
510 nonetheless necessary to ensure that fixup code gets assigned to the
511 right exception regions. */
512 using_eh_for_cleanups ();
514 eh_personality_libfunc = init_one_libfunc (USING_SJLJ_EXCEPTIONS
515 ? "__gnat_eh_personality_sj"
516 : "__gnat_eh_personality");
517 lang_eh_type_covers = gnat_eh_type_covers;
518 lang_eh_runtime_type = gnat_return_tree;
519 default_init_unwind_resume_libfunc ();
521 /* Turn on -fexceptions and -fnon-call-exceptions. The first one triggers
522 the generation of the necessary exception runtime tables. The second one
523 is useful for two reasons: 1/ we map some asynchronous signals like SEGV
524 to exceptions, so we need to ensure that the insns which can lead to such
525 signals are correctly attached to the exception region they pertain to,
526 2/ Some calls to pure subprograms are handled as libcall blocks and then
527 marked as "cannot trap" if the flag is not set (see emit_libcall_block).
528 We should not let this be since it is possible for such calls to actually
531 flag_non_call_exceptions = 1;
534 #ifdef DWARF2_UNWIND_INFO
535 if (!dwarf2out_frame_initialized && dwarf2out_do_frame ())
536 dwarf2out_frame_init ();
540 /* Language hooks, first one to print language-specific items in a DECL. */
543 gnat_print_decl (FILE *file, tree node, int indent)
545 switch (TREE_CODE (node))
548 print_node (file, "const_corresponding_var",
549 DECL_CONST_CORRESPONDING_VAR (node), indent + 4);
553 print_node (file, "original_field", DECL_ORIGINAL_FIELD (node),
558 print_node (file, "renamed_object", DECL_RENAMED_OBJECT (node),
568 gnat_print_type (FILE *file, tree node, int indent)
570 switch (TREE_CODE (node))
573 print_node (file, "ci_co_list", TYPE_CI_CO_LIST (node), indent + 4);
577 print_node (file, "RM size", TYPE_RM_SIZE_NUM (node), indent + 4);
581 if (TYPE_MODULAR_P (node))
582 print_node (file, "modulus", TYPE_MODULUS (node), indent + 4);
583 else if (TYPE_HAS_ACTUAL_BOUNDS_P (node))
584 print_node (file, "actual bounds", TYPE_ACTUAL_BOUNDS (node),
586 else if (TYPE_VAX_FLOATING_POINT_P (node))
589 print_node (file, "index type", TYPE_INDEX_TYPE (node), indent + 4);
591 print_node (file, "RM size", TYPE_RM_SIZE_NUM (node), indent + 4);
595 print_node (file,"actual bounds", TYPE_ACTUAL_BOUNDS (node), indent + 4);
599 if (TYPE_IS_FAT_POINTER_P (node) || TYPE_CONTAINS_TEMPLATE_P (node))
600 print_node (file, "unconstrained array",
601 TYPE_UNCONSTRAINED_ARRAY (node), indent + 4);
603 print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4);
607 case QUAL_UNION_TYPE:
608 print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4);
617 gnat_dwarf_name (tree t, int verbosity ATTRIBUTE_UNUSED)
619 gcc_assert (DECL_P (t));
621 return (const char *) IDENTIFIER_POINTER (DECL_NAME (t));
625 gnat_printable_name (tree decl, int verbosity)
627 const char *coded_name = IDENTIFIER_POINTER (DECL_NAME (decl));
628 char *ada_name = (char *) ggc_alloc (strlen (coded_name) * 2 + 60);
630 __gnat_decode (coded_name, ada_name, 0);
634 Set_Identifier_Casing (ada_name, (char *) DECL_SOURCE_FILE (decl));
635 ada_name = Name_Buffer;
638 return (const char *) ada_name;
641 /* Expands GNAT-specific GCC tree nodes. The only ones we support
642 here are and NULL_EXPR. */
645 gnat_expand_expr (tree exp, rtx target, enum machine_mode tmode,
646 int modifier, rtx *alt_rtl)
648 tree type = TREE_TYPE (exp);
651 /* Update EXP to be the new expression to expand. */
652 switch (TREE_CODE (exp))
657 allocate_dynamic_stack_space
658 (expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, TYPE_MODE (sizetype),
660 NULL_RTX, tree_low_cst (TREE_OPERAND (exp, 1), 1));
663 case UNCONSTRAINED_ARRAY_REF:
664 /* If we are evaluating just for side-effects, just evaluate our
665 operand. Otherwise, abort since this code should never appear
666 in a tree to be evaluated (objects aren't unconstrained). */
667 if (target == const0_rtx || TREE_CODE (type) == VOID_TYPE)
668 return expand_expr (TREE_OPERAND (exp, 0), const0_rtx,
671 /* ... fall through ... */
677 return expand_expr_real (new, target, tmode, modifier, alt_rtl);
680 /* Do nothing (return the tree node passed). */
683 gnat_return_tree (tree t)
688 /* Return true if type A catches type B. Callback for flow analysis from
689 the exception handling part of the back-end. */
692 gnat_eh_type_covers (tree a, tree b)
694 /* a catches b if they represent the same exception id or if a
697 ??? integer_zero_node for "others" is hardwired in too many places
699 return (a == b || a == integer_zero_node);
702 /* Get the alias set corresponding to a type or expression. */
704 static alias_set_type
705 gnat_get_alias_set (tree type)
707 /* If this is a padding type, use the type of the first field. */
708 if (TREE_CODE (type) == RECORD_TYPE
709 && TYPE_IS_PADDING_P (type))
710 return get_alias_set (TREE_TYPE (TYPE_FIELDS (type)));
712 /* If the type is an unconstrained array, use the type of the
713 self-referential array we make. */
714 else if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)
716 get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))));
718 /* If the type can alias any other types, return the alias set 0. */
719 else if (TYPE_P (type)
720 && TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (type)))
726 /* GNU_TYPE is a type. Return its maximum size in bytes, if known,
727 as a constant when possible. */
730 gnat_type_max_size (const_tree gnu_type)
732 /* First see what we can get from TYPE_SIZE_UNIT, which might not
733 be constant even for simple expressions if it has already been
734 elaborated and possibly replaced by a VAR_DECL. */
735 tree max_unitsize = max_size (TYPE_SIZE_UNIT (gnu_type), true);
737 /* If we don't have a constant, see what we can get from TYPE_ADA_SIZE,
738 which should stay untouched. */
739 if (!host_integerp (max_unitsize, 1)
740 && (TREE_CODE (gnu_type) == RECORD_TYPE
741 || TREE_CODE (gnu_type) == UNION_TYPE
742 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
743 && TYPE_ADA_SIZE (gnu_type))
745 tree max_adasize = max_size (TYPE_ADA_SIZE (gnu_type), true);
747 /* If we have succeeded in finding a constant, round it up to the
748 type's alignment and return the result in units. */
749 if (host_integerp (max_adasize, 1))
751 = size_binop (CEIL_DIV_EXPR,
752 round_up (max_adasize, TYPE_ALIGN (gnu_type)),
759 /* GNU_TYPE is a type. Determine if it should be passed by reference by
763 default_pass_by_ref (tree gnu_type)
765 /* We pass aggregates by reference if they are sufficiently large. The
766 choice of constant here is somewhat arbitrary. We also pass by
767 reference if the target machine would either pass or return by
768 reference. Strictly speaking, we need only check the return if this
769 is an In Out parameter, but it's probably best to err on the side of
770 passing more things by reference. */
772 if (pass_by_reference (NULL, TYPE_MODE (gnu_type), gnu_type, 1))
775 if (targetm.calls.return_in_memory (gnu_type, NULL_TREE))
778 if (AGGREGATE_TYPE_P (gnu_type)
779 && (!host_integerp (TYPE_SIZE (gnu_type), 1)
780 || 0 < compare_tree_int (TYPE_SIZE (gnu_type),
781 8 * TYPE_ALIGN (gnu_type))))
787 /* GNU_TYPE is the type of a subprogram parameter. Determine from the type if
788 it should be passed by reference. */
791 must_pass_by_ref (tree gnu_type)
793 /* We pass only unconstrained objects, those required by the language
794 to be passed by reference, and objects of variable size. The latter
795 is more efficient, avoids problems with variable size temporaries,
796 and does not produce compatibility problems with C, since C does
797 not have such objects. */
798 return (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
799 || (AGGREGATE_TYPE_P (gnu_type) && TYPE_BY_REFERENCE_P (gnu_type))
800 || (TYPE_SIZE (gnu_type)
801 && TREE_CODE (TYPE_SIZE (gnu_type)) != INTEGER_CST));
804 /* This function is called by the front end to enumerate all the supported
805 modes for the machine. We pass a function which is called back with
806 the following integer parameters:
808 FLOAT_P nonzero if this represents a floating-point mode
809 COMPLEX_P nonzero is this represents a complex mode
810 COUNT count of number of items, nonzero for vector mode
811 PRECISION number of bits in data representation
812 MANTISSA number of bits in mantissa, if FP and known, else zero.
813 SIZE number of bits used to store data
814 ALIGN number of bits to which mode is aligned. */
817 enumerate_modes (void (*f) (int, int, int, int, int, int, unsigned int))
821 for (i = 0; i < NUM_MACHINE_MODES; i++)
829 enum machine_mode inner_mode = i;
831 switch (GET_MODE_CLASS (i))
838 case MODE_COMPLEX_INT:
840 inner_mode = GET_MODE_INNER (i);
842 case MODE_COMPLEX_FLOAT:
845 inner_mode = GET_MODE_INNER (i);
847 case MODE_VECTOR_INT:
849 inner_mode = GET_MODE_INNER (i);
851 case MODE_VECTOR_FLOAT:
854 inner_mode = GET_MODE_INNER (i);
860 /* Skip this mode if it's one the front end doesn't need to know about
861 (e.g., the CC modes) or if there is no add insn for that mode (or
862 any wider mode), meaning it is not supported by the hardware. If
863 this a complex or vector mode, we care about the inner mode. */
864 for (j = inner_mode; j != VOIDmode; j = GET_MODE_WIDER_MODE (j))
865 if (optab_handler (add_optab, j)->insn_code != CODE_FOR_nothing)
870 const struct real_format *fmt = REAL_MODE_FORMAT (inner_mode);
875 if (!skip_p && j != VOIDmode)
876 (*f) (float_p, complex_p, vector_p ? GET_MODE_NUNITS (i) : 0,
877 GET_MODE_BITSIZE (i), mantissa,
878 GET_MODE_SIZE (i) * BITS_PER_UNIT, GET_MODE_ALIGNMENT (i));
883 fp_prec_to_size (int prec)
885 enum machine_mode mode;
887 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
888 mode = GET_MODE_WIDER_MODE (mode))
889 if (GET_MODE_PRECISION (mode) == prec)
890 return GET_MODE_BITSIZE (mode);
896 fp_size_to_prec (int size)
898 enum machine_mode mode;
900 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
901 mode = GET_MODE_WIDER_MODE (mode))
902 if (GET_MODE_BITSIZE (mode) == size)
903 return GET_MODE_PRECISION (mode);