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_ATTRIBUTE_TABLE
155 #define LANG_HOOKS_ATTRIBUTE_TABLE gnat_internal_attribute_table
156 #undef LANG_HOOKS_BUILTIN_FUNCTION
157 #define LANG_HOOKS_BUILTIN_FUNCTION gnat_builtin_function
159 const struct lang_hooks lang_hooks
= LANG_HOOKS_INITIALIZER
;
161 /* Tables describing GCC tree codes used only by GNAT.
163 Table indexed by tree code giving a string containing a character
164 classifying the tree code. Possibilities are
165 t, d, s, c, r, <, 1 and 2. See cp-tree.def for details. */
167 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
169 const enum tree_code_class tree_code_type
[] = {
172 #include "ada-tree.def"
176 /* Table indexed by tree code giving number of expression
177 operands beyond the fixed part of the node structure.
178 Not used for types or decls. */
180 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
182 const unsigned char tree_code_length
[] = {
185 #include "ada-tree.def"
189 /* Names of tree components.
190 Used for printing out the tree and error messages. */
191 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
193 const char *const tree_code_name
[] = {
196 #include "ada-tree.def"
200 /* Command-line argc and argv.
201 These variables are global, since they are imported and used in
204 unsigned int save_argc
;
205 const char **save_argv
;
207 /* gnat standard argc argv */
209 extern int gnat_argc
;
210 extern char **gnat_argv
;
213 /* Declare functions we use as part of startup. */
214 extern void __gnat_initialize (void *);
215 extern void __gnat_install_SEH_handler (void *);
216 extern void adainit (void);
217 extern void _ada_gnat1drv (void);
219 /* The parser for the language. For us, we process the GNAT tree. */
222 gnat_parse_file (int set_yydebug ATTRIBUTE_UNUSED
)
226 /* Call the target specific initializations. */
227 __gnat_initialize (NULL
);
229 /* ??? Call the SEH initialization routine. This is to workaround
230 a bootstrap path problem. The call below should be removed at some
231 point and the SEH pointer passed to __gnat_initialize() above. */
232 __gnat_install_SEH_handler((void *)seh
);
234 /* Call the front-end elaboration procedures. */
237 /* Call the front end. */
240 /* We always have a single compilation unit in Ada. */
241 cgraph_finalize_compilation_unit ();
244 /* Decode all the language specific options that cannot be decoded by GCC.
245 The option decoding phase of GCC calls this routine on the flags that
246 it cannot decode. This routine returns the number of consecutive arguments
247 from ARGV that it successfully decoded; 0 indicates failure. */
250 gnat_handle_option (size_t scode
, const char *arg
, int value
)
252 const struct cl_option
*option
= &cl_options
[scode
];
253 enum opt_code code
= (enum opt_code
) scode
;
256 if (arg
== NULL
&& (option
->flags
& (CL_JOINED
| CL_SEPARATE
)))
258 error ("missing argument to \"-%s\"", option
->opt_text
);
265 q
= xmalloc (sizeof("-I") + strlen (arg
));
268 gnat_argv
[gnat_argc
] = q
;
275 /* We save the value of warn_uninitialized, since if they put
276 -Wuninitialized on the command line, we need to generate a
277 warning about not using it without also specifying -O. */
278 if (warn_uninitialized
!= 1)
279 warn_uninitialized
= (value
? 2 : 0);
282 /* These are used in the GCC Makefile. */
283 case OPT_Wmissing_prototypes
:
284 case OPT_Wstrict_prototypes
:
285 case OPT_Wwrite_strings
:
287 case OPT_Wvariadic_macros
:
288 case OPT_Wold_style_definition
:
289 case OPT_Wmissing_format_attribute
:
290 case OPT_Woverlength_strings
:
293 /* This is handled by the front-end. */
298 gnat_argv
[gnat_argc
] = xstrdup ("-nostdlib");
302 case OPT_feliminate_unused_debug_types
:
303 /* We arrange for post_option to be able to only set the corresponding
304 flag to 1 when explicitely requested by the user. We expect the
305 default flag value to be either 0 or positive, and expose a positive
306 -f as a negative value to post_option. */
307 flag_eliminate_unused_debug_types
= -value
;
311 gnat_argv
[gnat_argc
] = xstrdup ("-fRTS");
316 warning (0, "%<-gnat%> misspelled as %<-gant%>");
318 /* ... fall through ... */
321 /* Recopy the switches without the 'gnat' prefix. */
322 gnat_argv
[gnat_argc
] = xmalloc (strlen (arg
) + 2);
323 gnat_argv
[gnat_argc
][0] = '-';
324 strcpy (gnat_argv
[gnat_argc
] + 1, arg
);
329 gnat_argv
[gnat_argc
] = xstrdup ("-O");
331 gnat_argv
[gnat_argc
] = xstrdup (arg
);
342 /* Initialize for option processing. */
345 gnat_init_options (unsigned int argc
, const char **argv
)
347 /* Initialize gnat_argv with save_argv size. */
348 gnat_argv
= (char **) xmalloc ((argc
+ 1) * sizeof (argv
[0]));
349 gnat_argv
[0] = xstrdup (argv
[0]); /* name of the command */
355 /* Uninitialized really means uninitialized in Ada. */
356 flag_zero_initialized_in_bss
= 0;
361 /* Post-switch processing. */
364 gnat_post_options (const char **pfilename ATTRIBUTE_UNUSED
)
366 /* ??? The warning machinery is outsmarted by Ada. */
367 warn_unused_parameter
= 0;
369 flag_inline_trees
= 1;
373 if (flag_inline_functions
)
374 flag_inline_trees
= 2;
376 /* Force eliminate_unused_debug_types to 0 unless an explicit positive
377 -f has been passed. This forces the default to 0 for Ada, which might
378 differ from the common default. */
379 if (flag_eliminate_unused_debug_types
< 0)
380 flag_eliminate_unused_debug_types
= 1;
382 flag_eliminate_unused_debug_types
= 0;
387 /* Here is the function to handle the compiler error processing in GCC. */
390 internal_error_function (const char *msgid
, va_list *ap
)
393 char *buffer
, *p
, *loc
;
394 String_Template temp
, temp_loc
;
395 Fat_Pointer fp
, fp_loc
;
398 /* Reset the pretty-printer. */
399 pp_clear_output_area (global_dc
->printer
);
401 /* Format the message into the pretty-printer. */
402 tinfo
.format_spec
= msgid
;
404 tinfo
.err_no
= errno
;
405 pp_format_verbatim (global_dc
->printer
, &tinfo
);
407 /* Extract a (writable) pointer to the formatted text. */
408 buffer
= (char*) pp_formatted_text (global_dc
->printer
);
410 /* Go up to the first newline. */
411 for (p
= buffer
; *p
; p
++)
419 temp
.High_Bound
= p
- buffer
;
423 s
= expand_location (input_location
);
424 if (flag_show_column
&& s
.column
!= 0)
425 asprintf (&loc
, "%s:%d:%d", s
.file
, s
.line
, s
.column
);
427 asprintf (&loc
, "%s:%d", s
.file
, s
.line
);
428 temp_loc
.Low_Bound
= 1;
429 temp_loc
.High_Bound
= strlen (loc
);
430 fp_loc
.Bounds
= &temp_loc
;
433 Current_Error_Node
= error_gnat_node
;
434 Compiler_Abort (fp
, -1, fp_loc
);
437 /* Perform all the initialization steps that are language-specific. */
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 ();
459 /* This function is called indirectly from toplev.c to handle incomplete
460 declarations, i.e. VAR_DECL nodes whose DECL_SIZE is zero. To be precise,
461 compile_file in toplev.c makes an indirect call through the function pointer
462 incomplete_decl_finalize_hook which is initialized to this routine in
463 init_decl_processing. */
466 gnat_finish_incomplete_decl (tree dont_care ATTRIBUTE_UNUSED
)
471 /* Compute the alignment of the largest mode that can be used for copying
475 gnat_compute_largest_alignment (void)
477 enum machine_mode mode
;
479 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
); mode
!= VOIDmode
;
480 mode
= GET_MODE_WIDER_MODE (mode
))
481 if (optab_handler (mov_optab
, mode
)->insn_code
!= CODE_FOR_nothing
)
482 largest_move_alignment
= MIN (BIGGEST_ALIGNMENT
,
483 MAX (largest_move_alignment
,
484 GET_MODE_ALIGNMENT (mode
)));
487 /* If we are using the GCC mechanism to process exception handling, we
488 have to register the personality routine for Ada and to initialize
489 various language dependent hooks. */
492 gnat_init_gcc_eh (void)
494 #ifdef DWARF2_UNWIND_INFO
495 /* lang_dependent_init already called dwarf2out_frame_init if true. */
496 int dwarf2out_frame_initialized
= dwarf2out_do_frame ();
499 /* We shouldn't do anything if the No_Exceptions_Handler pragma is set,
500 though. This could for instance lead to the emission of tables with
501 references to symbols (such as the Ada eh personality routine) within
502 libraries we won't link against. */
503 if (No_Exception_Handlers_Set ())
506 /* Tell GCC we are handling cleanup actions through exception propagation.
507 This opens possibilities that we don't take advantage of yet, but is
508 nonetheless necessary to ensure that fixup code gets assigned to the
509 right exception regions. */
510 using_eh_for_cleanups ();
512 eh_personality_libfunc
= init_one_libfunc (USING_SJLJ_EXCEPTIONS
513 ? "__gnat_eh_personality_sj"
514 : "__gnat_eh_personality");
515 lang_eh_type_covers
= gnat_eh_type_covers
;
516 lang_eh_runtime_type
= gnat_return_tree
;
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
529 flag_non_call_exceptions
= 1;
532 #ifdef DWARF2_UNWIND_INFO
533 if (!dwarf2out_frame_initialized
&& dwarf2out_do_frame ())
534 dwarf2out_frame_init ();
538 /* Language hooks, first one to print language-specific items in a DECL. */
541 gnat_print_decl (FILE *file
, tree node
, int indent
)
543 switch (TREE_CODE (node
))
546 print_node (file
, "const_corresponding_var",
547 DECL_CONST_CORRESPONDING_VAR (node
), indent
+ 4);
551 print_node (file
, "original_field", DECL_ORIGINAL_FIELD (node
),
556 print_node (file
, "renamed_object", DECL_RENAMED_OBJECT (node
),
566 gnat_print_type (FILE *file
, tree node
, int indent
)
568 switch (TREE_CODE (node
))
571 print_node (file
, "ci_co_list", TYPE_CI_CO_LIST (node
), indent
+ 4);
575 print_node (file
, "RM size", TYPE_RM_SIZE_NUM (node
), indent
+ 4);
579 if (TYPE_MODULAR_P (node
))
580 print_node (file
, "modulus", TYPE_MODULUS (node
), indent
+ 4);
581 else if (TYPE_HAS_ACTUAL_BOUNDS_P (node
))
582 print_node (file
, "actual bounds", TYPE_ACTUAL_BOUNDS (node
),
584 else if (TYPE_VAX_FLOATING_POINT_P (node
))
587 print_node (file
, "index type", TYPE_INDEX_TYPE (node
), indent
+ 4);
589 print_node (file
, "RM size", TYPE_RM_SIZE_NUM (node
), indent
+ 4);
593 print_node (file
,"actual bounds", TYPE_ACTUAL_BOUNDS (node
), indent
+ 4);
597 if (TYPE_IS_FAT_POINTER_P (node
) || TYPE_CONTAINS_TEMPLATE_P (node
))
598 print_node (file
, "unconstrained array",
599 TYPE_UNCONSTRAINED_ARRAY (node
), indent
+ 4);
601 print_node (file
, "Ada size", TYPE_ADA_SIZE (node
), indent
+ 4);
605 case QUAL_UNION_TYPE
:
606 print_node (file
, "Ada size", TYPE_ADA_SIZE (node
), indent
+ 4);
615 gnat_dwarf_name (tree t
, int verbosity ATTRIBUTE_UNUSED
)
617 gcc_assert (DECL_P (t
));
619 return (const char *) IDENTIFIER_POINTER (DECL_NAME (t
));
623 gnat_printable_name (tree decl
, int verbosity
)
625 const char *coded_name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
626 char *ada_name
= (char *) ggc_alloc (strlen (coded_name
) * 2 + 60);
628 __gnat_decode (coded_name
, ada_name
, 0);
632 Set_Identifier_Casing (ada_name
, (char *) DECL_SOURCE_FILE (decl
));
633 ada_name
= Name_Buffer
;
636 return (const char *) ada_name
;
639 /* Expands GNAT-specific GCC tree nodes. The only ones we support
640 here are and NULL_EXPR. */
643 gnat_expand_expr (tree exp
, rtx target
, enum machine_mode tmode
,
644 int modifier
, rtx
*alt_rtl
)
646 tree type
= TREE_TYPE (exp
);
649 /* Update EXP to be the new expression to expand. */
650 switch (TREE_CODE (exp
))
655 allocate_dynamic_stack_space
656 (expand_expr (TREE_OPERAND (exp
, 0), NULL_RTX
, TYPE_MODE (sizetype
),
658 NULL_RTX
, tree_low_cst (TREE_OPERAND (exp
, 1), 1));
661 case UNCONSTRAINED_ARRAY_REF
:
662 /* If we are evaluating just for side-effects, just evaluate our
663 operand. Otherwise, abort since this code should never appear
664 in a tree to be evaluated (objects aren't unconstrained). */
665 if (target
== const0_rtx
|| TREE_CODE (type
) == VOID_TYPE
)
666 return expand_expr (TREE_OPERAND (exp
, 0), const0_rtx
,
669 /* ... fall through ... */
675 return expand_expr_real (new, target
, tmode
, modifier
, alt_rtl
);
678 /* Do nothing (return the tree node passed). */
681 gnat_return_tree (tree t
)
686 /* Return true if type A catches type B. Callback for flow analysis from
687 the exception handling part of the back-end. */
690 gnat_eh_type_covers (tree a
, tree b
)
692 /* a catches b if they represent the same exception id or if a
695 ??? integer_zero_node for "others" is hardwired in too many places
697 return (a
== b
|| a
== integer_zero_node
);
700 /* Get the alias set corresponding to a type or expression. */
702 static alias_set_type
703 gnat_get_alias_set (tree type
)
705 /* If this is a padding type, use the type of the first field. */
706 if (TREE_CODE (type
) == RECORD_TYPE
707 && TYPE_IS_PADDING_P (type
))
708 return get_alias_set (TREE_TYPE (TYPE_FIELDS (type
)));
710 /* If the type is an unconstrained array, use the type of the
711 self-referential array we make. */
712 else if (TREE_CODE (type
) == UNCONSTRAINED_ARRAY_TYPE
)
714 get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type
)))));
716 /* If the type can alias any other types, return the alias set 0. */
717 else if (TYPE_P (type
)
718 && TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (type
)))
724 /* GNU_TYPE is a type. Return its maximum size in bytes, if known,
725 as a constant when possible. */
728 gnat_type_max_size (const_tree gnu_type
)
730 /* First see what we can get from TYPE_SIZE_UNIT, which might not
731 be constant even for simple expressions if it has already been
732 elaborated and possibly replaced by a VAR_DECL. */
733 tree max_unitsize
= max_size (TYPE_SIZE_UNIT (gnu_type
), true);
735 /* If we don't have a constant, see what we can get from TYPE_ADA_SIZE,
736 which should stay untouched. */
737 if (!host_integerp (max_unitsize
, 1)
738 && (TREE_CODE (gnu_type
) == RECORD_TYPE
739 || TREE_CODE (gnu_type
) == UNION_TYPE
740 || TREE_CODE (gnu_type
) == QUAL_UNION_TYPE
)
741 && TYPE_ADA_SIZE (gnu_type
))
743 tree max_adasize
= max_size (TYPE_ADA_SIZE (gnu_type
), true);
745 /* If we have succeeded in finding a constant, round it up to the
746 type's alignment and return the result in units. */
747 if (host_integerp (max_adasize
, 1))
749 = size_binop (CEIL_DIV_EXPR
,
750 round_up (max_adasize
, TYPE_ALIGN (gnu_type
)),
757 /* GNU_TYPE is a type. Determine if it should be passed by reference by
761 default_pass_by_ref (tree gnu_type
)
763 /* We pass aggregates by reference if they are sufficiently large. The
764 choice of constant here is somewhat arbitrary. We also pass by
765 reference if the target machine would either pass or return by
766 reference. Strictly speaking, we need only check the return if this
767 is an In Out parameter, but it's probably best to err on the side of
768 passing more things by reference. */
770 if (pass_by_reference (NULL
, TYPE_MODE (gnu_type
), gnu_type
, 1))
773 if (targetm
.calls
.return_in_memory (gnu_type
, NULL_TREE
))
776 if (AGGREGATE_TYPE_P (gnu_type
)
777 && (!host_integerp (TYPE_SIZE (gnu_type
), 1)
778 || 0 < compare_tree_int (TYPE_SIZE (gnu_type
),
779 8 * TYPE_ALIGN (gnu_type
))))
785 /* GNU_TYPE is the type of a subprogram parameter. Determine from the type if
786 it should be passed by reference. */
789 must_pass_by_ref (tree gnu_type
)
791 /* We pass only unconstrained objects, those required by the language
792 to be passed by reference, and objects of variable size. The latter
793 is more efficient, avoids problems with variable size temporaries,
794 and does not produce compatibility problems with C, since C does
795 not have such objects. */
796 return (TREE_CODE (gnu_type
) == UNCONSTRAINED_ARRAY_TYPE
797 || (AGGREGATE_TYPE_P (gnu_type
) && TYPE_BY_REFERENCE_P (gnu_type
))
798 || (TYPE_SIZE (gnu_type
)
799 && TREE_CODE (TYPE_SIZE (gnu_type
)) != INTEGER_CST
));
802 /* This function is called by the front end to enumerate all the supported
803 modes for the machine. We pass a function which is called back with
804 the following integer parameters:
806 FLOAT_P nonzero if this represents a floating-point mode
807 COMPLEX_P nonzero is this represents a complex mode
808 COUNT count of number of items, nonzero for vector mode
809 PRECISION number of bits in data representation
810 MANTISSA number of bits in mantissa, if FP and known, else zero.
811 SIZE number of bits used to store data
812 ALIGN number of bits to which mode is aligned. */
815 enumerate_modes (void (*f
) (int, int, int, int, int, int, unsigned int))
819 for (i
= 0; i
< NUM_MACHINE_MODES
; i
++)
827 enum machine_mode inner_mode
= i
;
829 switch (GET_MODE_CLASS (i
))
836 case MODE_COMPLEX_INT
:
838 inner_mode
= GET_MODE_INNER (i
);
840 case MODE_COMPLEX_FLOAT
:
843 inner_mode
= GET_MODE_INNER (i
);
845 case MODE_VECTOR_INT
:
847 inner_mode
= GET_MODE_INNER (i
);
849 case MODE_VECTOR_FLOAT
:
852 inner_mode
= GET_MODE_INNER (i
);
858 /* Skip this mode if it's one the front end doesn't need to know about
859 (e.g., the CC modes) or if there is no add insn for that mode (or
860 any wider mode), meaning it is not supported by the hardware. If
861 this a complex or vector mode, we care about the inner mode. */
862 for (j
= inner_mode
; j
!= VOIDmode
; j
= GET_MODE_WIDER_MODE (j
))
863 if (optab_handler (add_optab
, j
)->insn_code
!= CODE_FOR_nothing
)
868 const struct real_format
*fmt
= REAL_MODE_FORMAT (inner_mode
);
873 if (!skip_p
&& j
!= VOIDmode
)
874 (*f
) (float_p
, complex_p
, vector_p
? GET_MODE_NUNITS (i
) : 0,
875 GET_MODE_BITSIZE (i
), mantissa
,
876 GET_MODE_SIZE (i
) * BITS_PER_UNIT
, GET_MODE_ALIGNMENT (i
));
881 fp_prec_to_size (int prec
)
883 enum machine_mode mode
;
885 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
); mode
!= VOIDmode
;
886 mode
= GET_MODE_WIDER_MODE (mode
))
887 if (GET_MODE_PRECISION (mode
) == prec
)
888 return GET_MODE_BITSIZE (mode
);
894 fp_size_to_prec (int size
)
896 enum machine_mode mode
;
898 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
); mode
!= VOIDmode
;
899 mode
= GET_MODE_WIDER_MODE (mode
))
900 if (GET_MODE_BITSIZE (mode
) == size
)
901 return GET_MODE_PRECISION (mode
);