1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2007, 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_eh_runtime_type (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 gnat_expand_body (tree
);
104 static void internal_error_function (const char *, va_list *);
105 static void gnat_adjust_rli (record_layout_info
);
106 static tree
gnat_type_max_size (tree
);
108 /* Definitions for our language-specific hooks. */
110 #undef LANG_HOOKS_NAME
111 #define LANG_HOOKS_NAME "GNU Ada"
112 #undef LANG_HOOKS_IDENTIFIER_SIZE
113 #define LANG_HOOKS_IDENTIFIER_SIZE sizeof (struct tree_identifier)
114 #undef LANG_HOOKS_INIT
115 #define LANG_HOOKS_INIT gnat_init
116 #undef LANG_HOOKS_INIT_OPTIONS
117 #define LANG_HOOKS_INIT_OPTIONS gnat_init_options
118 #undef LANG_HOOKS_HANDLE_OPTION
119 #define LANG_HOOKS_HANDLE_OPTION gnat_handle_option
120 #undef LANG_HOOKS_POST_OPTIONS
121 #define LANG_HOOKS_POST_OPTIONS gnat_post_options
122 #undef LANG_HOOKS_PARSE_FILE
123 #define LANG_HOOKS_PARSE_FILE gnat_parse_file
124 #undef LANG_HOOKS_HASH_TYPES
125 #define LANG_HOOKS_HASH_TYPES false
126 #undef LANG_HOOKS_GETDECLS
127 #define LANG_HOOKS_GETDECLS lhd_return_null_tree_v
128 #undef LANG_HOOKS_PUSHDECL
129 #define LANG_HOOKS_PUSHDECL lhd_return_tree
130 #undef LANG_HOOKS_WRITE_GLOBALS
131 #define LANG_HOOKS_WRITE_GLOBALS gnat_write_global_declarations
132 #undef LANG_HOOKS_FINISH_INCOMPLETE_DECL
133 #define LANG_HOOKS_FINISH_INCOMPLETE_DECL gnat_finish_incomplete_decl
134 #undef LANG_HOOKS_REDUCE_BIT_FIELD_OPERATIONS
135 #define LANG_HOOKS_REDUCE_BIT_FIELD_OPERATIONS true
136 #undef LANG_HOOKS_GET_ALIAS_SET
137 #define LANG_HOOKS_GET_ALIAS_SET gnat_get_alias_set
138 #undef LANG_HOOKS_EXPAND_EXPR
139 #define LANG_HOOKS_EXPAND_EXPR gnat_expand_expr
140 #undef LANG_HOOKS_MARK_ADDRESSABLE
141 #define LANG_HOOKS_MARK_ADDRESSABLE gnat_mark_addressable
142 #undef LANG_HOOKS_PRINT_DECL
143 #define LANG_HOOKS_PRINT_DECL gnat_print_decl
144 #undef LANG_HOOKS_PRINT_TYPE
145 #define LANG_HOOKS_PRINT_TYPE gnat_print_type
146 #undef LANG_HOOKS_TYPE_MAX_SIZE
147 #define LANG_HOOKS_TYPE_MAX_SIZE gnat_type_max_size
148 #undef LANG_HOOKS_DECL_PRINTABLE_NAME
149 #define LANG_HOOKS_DECL_PRINTABLE_NAME gnat_printable_name
150 #undef LANG_HOOKS_DWARF_NAME
151 #define LANG_HOOKS_DWARF_NAME gnat_dwarf_name
152 #undef LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION
153 #define LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION gnat_expand_body
154 #undef LANG_HOOKS_GIMPLIFY_EXPR
155 #define LANG_HOOKS_GIMPLIFY_EXPR gnat_gimplify_expr
156 #undef LANG_HOOKS_TYPE_FOR_MODE
157 #define LANG_HOOKS_TYPE_FOR_MODE gnat_type_for_mode
158 #undef LANG_HOOKS_TYPE_FOR_SIZE
159 #define LANG_HOOKS_TYPE_FOR_SIZE gnat_type_for_size
160 #undef LANG_HOOKS_ATTRIBUTE_TABLE
161 #define LANG_HOOKS_ATTRIBUTE_TABLE gnat_internal_attribute_table
162 #undef LANG_HOOKS_BUILTIN_FUNCTION
163 #define LANG_HOOKS_BUILTIN_FUNCTION gnat_builtin_function
165 const struct lang_hooks lang_hooks
= LANG_HOOKS_INITIALIZER
;
167 /* Tables describing GCC tree codes used only by GNAT.
169 Table indexed by tree code giving a string containing a character
170 classifying the tree code. Possibilities are
171 t, d, s, c, r, <, 1 and 2. See cp-tree.def for details. */
173 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
175 const enum tree_code_class tree_code_type
[] = {
178 #include "ada-tree.def"
182 /* Table indexed by tree code giving number of expression
183 operands beyond the fixed part of the node structure.
184 Not used for types or decls. */
186 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
188 const unsigned char tree_code_length
[] = {
191 #include "ada-tree.def"
195 /* Names of tree components.
196 Used for printing out the tree and error messages. */
197 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
199 const char *const tree_code_name
[] = {
202 #include "ada-tree.def"
206 /* Command-line argc and argv.
207 These variables are global, since they are imported and used in
210 unsigned int save_argc
;
211 const char **save_argv
;
213 /* gnat standard argc argv */
215 extern int gnat_argc
;
216 extern char **gnat_argv
;
219 /* Declare functions we use as part of startup. */
220 extern void __gnat_initialize (void *);
221 extern void __gnat_install_SEH_handler (void *);
222 extern void adainit (void);
223 extern void _ada_gnat1drv (void);
225 /* The parser for the language. For us, we process the GNAT tree. */
228 gnat_parse_file (int set_yydebug ATTRIBUTE_UNUSED
)
232 /* Call the target specific initializations. */
233 __gnat_initialize (NULL
);
235 /* ??? Call the SEH initialization routine. This is to workaround
236 a bootstrap path problem. The call below should be removed at some
237 point and the SEH pointer passed to __gnat_initialize() above. */
238 __gnat_install_SEH_handler((void *)seh
);
240 /* Call the front-end elaboration procedures. */
243 /* Call the front end. */
246 /* We always have a single compilation unit in Ada. */
247 cgraph_finalize_compilation_unit ();
250 /* Decode all the language specific options that cannot be decoded by GCC.
251 The option decoding phase of GCC calls this routine on the flags that
252 it cannot decode. This routine returns the number of consecutive arguments
253 from ARGV that it successfully decoded; 0 indicates failure. */
256 gnat_handle_option (size_t scode
, const char *arg
, int value ATTRIBUTE_UNUSED
)
258 const struct cl_option
*option
= &cl_options
[scode
];
259 enum opt_code code
= (enum opt_code
) scode
;
262 if (arg
== NULL
&& (option
->flags
& (CL_JOINED
| CL_SEPARATE
)))
264 error ("missing argument to \"-%s\"", option
->opt_text
);
274 q
= xmalloc (sizeof("-I") + strlen (arg
));
277 gnat_argv
[gnat_argc
] = q
;
281 /* All front ends are expected to accept this. */
283 /* These are used in the GCC Makefile. */
284 case OPT_Wmissing_prototypes
:
285 case OPT_Wstrict_prototypes
:
286 case OPT_Wwrite_strings
:
288 case OPT_Wvariadic_macros
:
289 case OPT_Wold_style_definition
:
290 case OPT_Wmissing_format_attribute
:
291 case OPT_Woverlength_strings
:
294 /* This is handled by the front-end. */
299 gnat_argv
[gnat_argc
] = xstrdup ("-nostdlib");
303 case OPT_feliminate_unused_debug_types
:
304 /* We arrange for post_option to be able to only set the corresponding
305 flag to 1 when explicitely requested by the user. We expect the
306 default flag value to be either 0 or positive, and expose a positive
307 -f as a negative value to post_option. */
308 flag_eliminate_unused_debug_types
= -value
;
312 gnat_argv
[gnat_argc
] = xstrdup ("-fRTS");
317 warning (0, "%<-gnat%> misspelled as %<-gant%>");
319 /* ... fall through ... */
322 /* Recopy the switches without the 'gnat' prefix. */
323 gnat_argv
[gnat_argc
] = xmalloc (strlen (arg
) + 2);
324 gnat_argv
[gnat_argc
][0] = '-';
325 strcpy (gnat_argv
[gnat_argc
] + 1, arg
);
330 gnat_argv
[gnat_argc
] = xstrdup ("-O");
332 gnat_argv
[gnat_argc
] = xstrdup (arg
);
340 /* Initialize for option processing. */
343 gnat_init_options (unsigned int argc
, const char **argv
)
345 /* Initialize gnat_argv with save_argv size. */
346 gnat_argv
= (char **) xmalloc ((argc
+ 1) * sizeof (argv
[0]));
347 gnat_argv
[0] = xstrdup (argv
[0]); /* name of the command */
353 /* Uninitialized really means uninitialized in Ada. */
354 flag_zero_initialized_in_bss
= 0;
359 /* Post-switch processing. */
362 gnat_post_options (const char **pfilename ATTRIBUTE_UNUSED
)
364 flag_inline_trees
= 1;
368 if (flag_inline_functions
)
369 flag_inline_trees
= 2;
371 /* Force eliminate_unused_debug_types to 0 unless an explicit positive
372 -f has been passed. This forces the default to 0 for Ada, which might
373 differ from the common default. */
374 if (flag_eliminate_unused_debug_types
< 0)
375 flag_eliminate_unused_debug_types
= 1;
377 flag_eliminate_unused_debug_types
= 0;
382 /* Here is the function to handle the compiler error processing in GCC. */
385 internal_error_function (const char *msgid
, va_list *ap
)
388 char *buffer
, *p
, *loc
;
389 String_Template temp
, temp_loc
;
390 Fat_Pointer fp
, fp_loc
;
393 /* Reset the pretty-printer. */
394 pp_clear_output_area (global_dc
->printer
);
396 /* Format the message into the pretty-printer. */
397 tinfo
.format_spec
= msgid
;
399 tinfo
.err_no
= errno
;
400 pp_format_verbatim (global_dc
->printer
, &tinfo
);
402 /* Extract a (writable) pointer to the formatted text. */
403 buffer
= (char*) pp_formatted_text (global_dc
->printer
);
405 /* Go up to the first newline. */
406 for (p
= buffer
; *p
; p
++)
414 temp
.High_Bound
= p
- buffer
;
418 s
= expand_location (input_location
);
419 #ifdef USE_MAPPED_LOCATION
420 if (flag_show_column
&& s
.column
!= 0)
421 asprintf (&loc
, "%s:%d:%d", s
.file
, s
.line
, s
.column
);
424 asprintf (&loc
, "%s:%d", s
.file
, s
.line
);
425 temp_loc
.Low_Bound
= 1;
426 temp_loc
.High_Bound
= strlen (loc
);
427 fp_loc
.Bounds
= &temp_loc
;
430 Current_Error_Node
= error_gnat_node
;
431 Compiler_Abort (fp
, -1, fp_loc
);
434 /* Perform all the initialization steps that are language-specific. */
439 /* Initialize translations and the outer statement group. */
440 gnat_init_stmt_group ();
442 /* Performs whatever initialization steps needed by the language-dependent
444 gnat_init_decl_processing ();
446 /* Add the input filename as the last argument. */
447 gnat_argv
[gnat_argc
] = (char *) main_input_filename
;
449 gnat_argv
[gnat_argc
] = 0;
451 global_dc
->internal_error
= &internal_error_function
;
453 /* Show that REFERENCE_TYPEs are internal and should be Pmode. */
454 internal_reference_types ();
456 set_lang_adjust_rli (gnat_adjust_rli
);
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 ("__gnat_eh_personality");
515 lang_eh_type_covers
= gnat_eh_type_covers
;
516 lang_eh_runtime_type
= gnat_eh_runtime_type
;
517 default_init_unwind_resume_libfunc ();
519 /* Turn on -fexceptions and -fnon-call-exceptions. The first one triggers
520 the generation of the necessary exception runtime tables. The second one
521 is useful for two reasons: 1/ we map some asynchronous signals like SEGV
522 to exceptions, so we need to ensure that the insns which can lead to such
523 signals are correctly attached to the exception region they pertain to,
524 2/ Some calls to pure subprograms are handled as libcall blocks and then
525 marked as "cannot trap" if the flag is not set (see emit_libcall_block).
526 We should not let this be since it is possible for such calls to actually
530 flag_non_call_exceptions
= 1;
533 #ifdef DWARF2_UNWIND_INFO
534 if (!dwarf2out_frame_initialized
&& dwarf2out_do_frame ())
535 dwarf2out_frame_init ();
539 /* Language hooks, first one to print language-specific items in a DECL. */
542 gnat_print_decl (FILE *file
, tree node
, int indent
)
544 switch (TREE_CODE (node
))
547 print_node (file
, "const_corresponding_var",
548 DECL_CONST_CORRESPONDING_VAR (node
), indent
+ 4);
552 print_node (file
, "original_field", DECL_ORIGINAL_FIELD (node
),
557 print_node (file
, "renamed_object", DECL_RENAMED_OBJECT (node
),
567 gnat_print_type (FILE *file
, tree node
, int indent
)
569 switch (TREE_CODE (node
))
572 print_node (file
, "ci_co_list", TYPE_CI_CO_LIST (node
), indent
+ 4);
576 print_node (file
, "RM size", TYPE_RM_SIZE_NUM (node
), indent
+ 4);
580 if (TYPE_MODULAR_P (node
))
581 print_node (file
, "modulus", TYPE_MODULUS (node
), indent
+ 4);
582 else if (TYPE_HAS_ACTUAL_BOUNDS_P (node
))
583 print_node (file
, "actual bounds", TYPE_ACTUAL_BOUNDS (node
),
585 else if (TYPE_VAX_FLOATING_POINT_P (node
))
588 print_node (file
, "index type", TYPE_INDEX_TYPE (node
), indent
+ 4);
590 print_node (file
, "RM size", TYPE_RM_SIZE_NUM (node
), indent
+ 4);
594 print_node (file
,"actual bounds", TYPE_ACTUAL_BOUNDS (node
), indent
+ 4);
598 if (TYPE_IS_FAT_POINTER_P (node
) || TYPE_CONTAINS_TEMPLATE_P (node
))
599 print_node (file
, "unconstrained array",
600 TYPE_UNCONSTRAINED_ARRAY (node
), indent
+ 4);
602 print_node (file
, "Ada size", TYPE_ADA_SIZE (node
), indent
+ 4);
606 case QUAL_UNION_TYPE
:
607 print_node (file
, "Ada size", TYPE_ADA_SIZE (node
), indent
+ 4);
616 gnat_printable_name (tree decl
, int verbosity
)
618 const char *coded_name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
619 char *ada_name
= (char *) ggc_alloc (strlen (coded_name
) * 2 + 60);
621 __gnat_decode (coded_name
, ada_name
, 0);
625 Set_Identifier_Casing (ada_name
, (char *) DECL_SOURCE_FILE (decl
));
626 ada_name
= Name_Buffer
;
629 return (const char *) ada_name
;
633 gnat_dwarf_name (tree t
, int verbosity ATTRIBUTE_UNUSED
)
635 gcc_assert (DECL_P (t
));
637 return (const char *) IDENTIFIER_POINTER (DECL_NAME (t
));
640 /* Expands GNAT-specific GCC tree nodes. The only ones we support
641 here are and NULL_EXPR. */
644 gnat_expand_expr (tree exp
, rtx target
, enum machine_mode tmode
,
645 int modifier
, rtx
*alt_rtl
)
647 tree type
= TREE_TYPE (exp
);
650 /* Update EXP to be the new expression to expand. */
651 switch (TREE_CODE (exp
))
656 allocate_dynamic_stack_space
657 (expand_expr (TREE_OPERAND (exp
, 0), NULL_RTX
, TYPE_MODE (sizetype
),
659 NULL_RTX
, tree_low_cst (TREE_OPERAND (exp
, 1), 1));
662 case UNCONSTRAINED_ARRAY_REF
:
663 /* If we are evaluating just for side-effects, just evaluate our
664 operand. Otherwise, abort since this code should never appear
665 in a tree to be evaluated (objects aren't unconstrained). */
666 if (target
== const0_rtx
|| TREE_CODE (type
) == VOID_TYPE
)
667 return expand_expr (TREE_OPERAND (exp
, 0), const0_rtx
,
670 /* ... fall through ... */
676 return expand_expr_real (new, target
, tmode
, modifier
, alt_rtl
);
679 /* Generate the RTL for the body of GNU_DECL. */
682 gnat_expand_body (tree gnu_decl
)
684 tree_rest_of_compilation (gnu_decl
);
687 /* Adjusts the RLI used to layout a record after all the fields have been
688 added. We only handle the packed case and cause it to use the alignment
689 that will pad the record at the end. */
692 gnat_adjust_rli (record_layout_info rli ATTRIBUTE_UNUSED
)
695 /* ??? This code seems to have no actual effect; record_align should already
696 reflect the largest alignment desired by a field. jason 2003-04-01 */
697 unsigned int record_align
= rli
->unpadded_align
;
700 /* If an alignment has been specified, don't use anything larger unless we
702 if (TYPE_ALIGN (rli
->t
) != 0 && TYPE_ALIGN (rli
->t
) < record_align
)
703 record_align
= MAX (rli
->record_align
, TYPE_ALIGN (rli
->t
));
705 /* If any fields have variable size, we need to force the record to be at
706 least as aligned as the alignment of that type. */
707 for (field
= TYPE_FIELDS (rli
->t
); field
; field
= TREE_CHAIN (field
))
708 if (TREE_CODE (DECL_SIZE_UNIT (field
)) != INTEGER_CST
)
709 record_align
= MAX (record_align
, DECL_ALIGN (field
));
711 if (TYPE_PACKED (rli
->t
))
712 rli
->record_align
= record_align
;
716 /* These routines are used in conjunction with GCC exception handling. */
718 /* Map compile-time to run-time tree for GCC exception handling scheme. */
721 gnat_eh_runtime_type (tree type
)
726 /* Return true if type A catches type B. Callback for flow analysis from
727 the exception handling part of the back-end. */
730 gnat_eh_type_covers (tree a
, tree b
)
732 /* a catches b if they represent the same exception id or if a
735 ??? integer_zero_node for "others" is hardwired in too many places
737 return (a
== b
|| a
== integer_zero_node
);
740 /* Get the alias set corresponding to a type or expression. */
742 static alias_set_type
743 gnat_get_alias_set (tree type
)
745 /* If this is a padding type, use the type of the first field. */
746 if (TREE_CODE (type
) == RECORD_TYPE
747 && TYPE_IS_PADDING_P (type
))
748 return get_alias_set (TREE_TYPE (TYPE_FIELDS (type
)));
750 /* If the type is an unconstrained array, use the type of the
751 self-referential array we make. */
752 else if (TREE_CODE (type
) == UNCONSTRAINED_ARRAY_TYPE
)
754 get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type
)))));
756 /* If the type can alias any other types, return the alias set 0. */
757 else if (TYPE_P (type
)
758 && TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (type
)))
764 /* GNU_TYPE is a type. Return its maximum size in bytes, if known,
765 as a constant when possible. */
768 gnat_type_max_size (tree gnu_type
)
770 /* First see what we can get from TYPE_SIZE_UNIT, which might not
771 be constant even for simple expressions if it has already been
772 elaborated and possibly replaced by a VAR_DECL. */
773 tree max_unitsize
= max_size (TYPE_SIZE_UNIT (gnu_type
), true);
775 /* If we don't have a constant, see what we can get from TYPE_ADA_SIZE,
776 which should stay untouched. */
777 if (!host_integerp (max_unitsize
, 1)
778 && (TREE_CODE (gnu_type
) == RECORD_TYPE
779 || TREE_CODE (gnu_type
) == UNION_TYPE
780 || TREE_CODE (gnu_type
) == QUAL_UNION_TYPE
)
781 && TYPE_ADA_SIZE (gnu_type
))
783 tree max_adasize
= max_size (TYPE_ADA_SIZE (gnu_type
), true);
785 /* If we have succeeded in finding a constant, round it up to the
786 type's alignment and return the result in units. */
787 if (host_integerp (max_adasize
, 1))
789 = size_binop (CEIL_DIV_EXPR
,
790 round_up (max_adasize
, TYPE_ALIGN (gnu_type
)),
797 /* GNU_TYPE is a type. Determine if it should be passed by reference by
801 default_pass_by_ref (tree gnu_type
)
803 /* We pass aggregates by reference if they are sufficiently large. The
804 choice of constant here is somewhat arbitrary. We also pass by
805 reference if the target machine would either pass or return by
806 reference. Strictly speaking, we need only check the return if this
807 is an In Out parameter, but it's probably best to err on the side of
808 passing more things by reference. */
810 if (pass_by_reference (NULL
, TYPE_MODE (gnu_type
), gnu_type
, 1))
813 if (targetm
.calls
.return_in_memory (gnu_type
, NULL_TREE
))
816 if (AGGREGATE_TYPE_P (gnu_type
)
817 && (!host_integerp (TYPE_SIZE (gnu_type
), 1)
818 || 0 < compare_tree_int (TYPE_SIZE (gnu_type
),
819 8 * TYPE_ALIGN (gnu_type
))))
825 /* GNU_TYPE is the type of a subprogram parameter. Determine from the type if
826 it should be passed by reference. */
829 must_pass_by_ref (tree gnu_type
)
831 /* We pass only unconstrained objects, those required by the language
832 to be passed by reference, and objects of variable size. The latter
833 is more efficient, avoids problems with variable size temporaries,
834 and does not produce compatibility problems with C, since C does
835 not have such objects. */
836 return (TREE_CODE (gnu_type
) == UNCONSTRAINED_ARRAY_TYPE
837 || (AGGREGATE_TYPE_P (gnu_type
) && TYPE_BY_REFERENCE_P (gnu_type
))
838 || (TYPE_SIZE (gnu_type
)
839 && TREE_CODE (TYPE_SIZE (gnu_type
)) != INTEGER_CST
));
842 /* This function is called by the front end to enumerate all the supported
843 modes for the machine. We pass a function which is called back with
844 the following integer parameters:
846 FLOAT_P nonzero if this represents a floating-point mode
847 COMPLEX_P nonzero is this represents a complex mode
848 COUNT count of number of items, nonzero for vector mode
849 PRECISION number of bits in data representation
850 MANTISSA number of bits in mantissa, if FP and known, else zero.
851 SIZE number of bits used to store data
852 ALIGN number of bits to which mode is aligned. */
855 enumerate_modes (void (*f
) (int, int, int, int, int, int, unsigned int))
859 for (i
= 0; i
< NUM_MACHINE_MODES
; i
++)
867 enum machine_mode inner_mode
= i
;
869 switch (GET_MODE_CLASS (i
))
876 case MODE_COMPLEX_INT
:
878 inner_mode
= GET_MODE_INNER (i
);
880 case MODE_COMPLEX_FLOAT
:
883 inner_mode
= GET_MODE_INNER (i
);
885 case MODE_VECTOR_INT
:
887 inner_mode
= GET_MODE_INNER (i
);
889 case MODE_VECTOR_FLOAT
:
892 inner_mode
= GET_MODE_INNER (i
);
898 /* Skip this mode if it's one the front end doesn't need to know about
899 (e.g., the CC modes) or if there is no add insn for that mode (or
900 any wider mode), meaning it is not supported by the hardware. If
901 this a complex or vector mode, we care about the inner mode. */
902 for (j
= inner_mode
; j
!= VOIDmode
; j
= GET_MODE_WIDER_MODE (j
))
903 if (optab_handler (add_optab
, j
)->insn_code
!= CODE_FOR_nothing
)
908 const struct real_format
*fmt
= REAL_MODE_FORMAT (inner_mode
);
913 if (!skip_p
&& j
!= VOIDmode
)
914 (*f
) (float_p
, complex_p
, vector_p
? GET_MODE_NUNITS (i
) : 0,
915 GET_MODE_BITSIZE (i
), mantissa
,
916 GET_MODE_SIZE (i
) * BITS_PER_UNIT
, GET_MODE_ALIGNMENT (i
));
921 fp_prec_to_size (int prec
)
923 enum machine_mode mode
;
925 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
); mode
!= VOIDmode
;
926 mode
= GET_MODE_WIDER_MODE (mode
))
927 if (GET_MODE_PRECISION (mode
) == prec
)
928 return GET_MODE_BITSIZE (mode
);
934 fp_size_to_prec (int size
)
936 enum machine_mode mode
;
938 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
); mode
!= VOIDmode
;
939 mode
= GET_MODE_WIDER_MODE (mode
))
940 if (GET_MODE_BITSIZE (mode
) == size
)
941 return GET_MODE_PRECISION (mode
);