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_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 void gnat_adjust_rli (record_layout_info);
105 static tree gnat_type_max_size (const_tree);
107 /* Definitions for our language-specific hooks. */
109 #undef LANG_HOOKS_NAME
110 #define LANG_HOOKS_NAME "GNU Ada"
111 #undef LANG_HOOKS_IDENTIFIER_SIZE
112 #define LANG_HOOKS_IDENTIFIER_SIZE sizeof (struct tree_identifier)
113 #undef LANG_HOOKS_INIT
114 #define LANG_HOOKS_INIT gnat_init
115 #undef LANG_HOOKS_INIT_OPTIONS
116 #define LANG_HOOKS_INIT_OPTIONS gnat_init_options
117 #undef LANG_HOOKS_HANDLE_OPTION
118 #define LANG_HOOKS_HANDLE_OPTION gnat_handle_option
119 #undef LANG_HOOKS_POST_OPTIONS
120 #define LANG_HOOKS_POST_OPTIONS gnat_post_options
121 #undef LANG_HOOKS_PARSE_FILE
122 #define LANG_HOOKS_PARSE_FILE gnat_parse_file
123 #undef LANG_HOOKS_HASH_TYPES
124 #define LANG_HOOKS_HASH_TYPES false
125 #undef LANG_HOOKS_GETDECLS
126 #define LANG_HOOKS_GETDECLS lhd_return_null_tree_v
127 #undef LANG_HOOKS_PUSHDECL
128 #define LANG_HOOKS_PUSHDECL gnat_return_tree
129 #undef LANG_HOOKS_WRITE_GLOBALS
130 #define LANG_HOOKS_WRITE_GLOBALS gnat_write_global_declarations
131 #undef LANG_HOOKS_FINISH_INCOMPLETE_DECL
132 #define LANG_HOOKS_FINISH_INCOMPLETE_DECL gnat_finish_incomplete_decl
133 #undef LANG_HOOKS_REDUCE_BIT_FIELD_OPERATIONS
134 #define LANG_HOOKS_REDUCE_BIT_FIELD_OPERATIONS true
135 #undef LANG_HOOKS_GET_ALIAS_SET
136 #define LANG_HOOKS_GET_ALIAS_SET gnat_get_alias_set
137 #undef LANG_HOOKS_EXPAND_EXPR
138 #define LANG_HOOKS_EXPAND_EXPR gnat_expand_expr
139 #undef LANG_HOOKS_MARK_ADDRESSABLE
140 #define LANG_HOOKS_MARK_ADDRESSABLE gnat_mark_addressable
141 #undef LANG_HOOKS_PRINT_DECL
142 #define LANG_HOOKS_PRINT_DECL gnat_print_decl
143 #undef LANG_HOOKS_PRINT_TYPE
144 #define LANG_HOOKS_PRINT_TYPE gnat_print_type
145 #undef LANG_HOOKS_TYPE_MAX_SIZE
146 #define LANG_HOOKS_TYPE_MAX_SIZE gnat_type_max_size
147 #undef LANG_HOOKS_DECL_PRINTABLE_NAME
148 #define LANG_HOOKS_DECL_PRINTABLE_NAME gnat_printable_name
149 #undef LANG_HOOKS_DWARF_NAME
150 #define LANG_HOOKS_DWARF_NAME gnat_dwarf_name
151 #undef LANG_HOOKS_GIMPLIFY_EXPR
152 #define LANG_HOOKS_GIMPLIFY_EXPR gnat_gimplify_expr
153 #undef LANG_HOOKS_TYPE_FOR_MODE
154 #define LANG_HOOKS_TYPE_FOR_MODE gnat_type_for_mode
155 #undef LANG_HOOKS_TYPE_FOR_SIZE
156 #define LANG_HOOKS_TYPE_FOR_SIZE gnat_type_for_size
157 #undef LANG_HOOKS_ATTRIBUTE_TABLE
158 #define LANG_HOOKS_ATTRIBUTE_TABLE gnat_internal_attribute_table
159 #undef LANG_HOOKS_BUILTIN_FUNCTION
160 #define LANG_HOOKS_BUILTIN_FUNCTION gnat_builtin_function
162 const struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
164 /* Tables describing GCC tree codes used only by GNAT.
166 Table indexed by tree code giving a string containing a character
167 classifying the tree code. Possibilities are
168 t, d, s, c, r, <, 1 and 2. See cp-tree.def for details. */
170 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
172 const enum tree_code_class tree_code_type[] = {
175 #include "ada-tree.def"
179 /* Table indexed by tree code giving number of expression
180 operands beyond the fixed part of the node structure.
181 Not used for types or decls. */
183 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
185 const unsigned char tree_code_length[] = {
188 #include "ada-tree.def"
192 /* Names of tree components.
193 Used for printing out the tree and error messages. */
194 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
196 const char *const tree_code_name[] = {
199 #include "ada-tree.def"
203 /* Command-line argc and argv.
204 These variables are global, since they are imported and used in
207 unsigned int save_argc;
208 const char **save_argv;
210 /* gnat standard argc argv */
212 extern int gnat_argc;
213 extern char **gnat_argv;
216 /* Declare functions we use as part of startup. */
217 extern void __gnat_initialize (void *);
218 extern void __gnat_install_SEH_handler (void *);
219 extern void adainit (void);
220 extern void _ada_gnat1drv (void);
222 /* The parser for the language. For us, we process the GNAT tree. */
225 gnat_parse_file (int set_yydebug ATTRIBUTE_UNUSED)
229 /* Call the target specific initializations. */
230 __gnat_initialize (NULL);
232 /* ??? Call the SEH initialization routine. This is to workaround
233 a bootstrap path problem. The call below should be removed at some
234 point and the SEH pointer passed to __gnat_initialize() above. */
235 __gnat_install_SEH_handler((void *)seh);
237 /* Call the front-end elaboration procedures. */
240 /* Call the front end. */
243 /* We always have a single compilation unit in Ada. */
244 cgraph_finalize_compilation_unit ();
247 /* Decode all the language specific options that cannot be decoded by GCC.
248 The option decoding phase of GCC calls this routine on the flags that
249 it cannot decode. This routine returns the number of consecutive arguments
250 from ARGV that it successfully decoded; 0 indicates failure. */
253 gnat_handle_option (size_t scode, const char *arg, int value ATTRIBUTE_UNUSED)
255 const struct cl_option *option = &cl_options[scode];
256 enum opt_code code = (enum opt_code) scode;
259 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
261 error ("missing argument to \"-%s\"", option->opt_text);
271 q = xmalloc (sizeof("-I") + strlen (arg));
274 gnat_argv[gnat_argc] = q;
278 /* All front ends are expected to accept this. */
280 /* These are used in the GCC Makefile. */
281 case OPT_Wmissing_prototypes:
282 case OPT_Wstrict_prototypes:
283 case OPT_Wwrite_strings:
285 case OPT_Wvariadic_macros:
286 case OPT_Wold_style_definition:
287 case OPT_Wmissing_format_attribute:
288 case OPT_Woverlength_strings:
291 /* This is handled by the front-end. */
296 gnat_argv[gnat_argc] = xstrdup ("-nostdlib");
300 case OPT_feliminate_unused_debug_types:
301 /* We arrange for post_option to be able to only set the corresponding
302 flag to 1 when explicitely requested by the user. We expect the
303 default flag value to be either 0 or positive, and expose a positive
304 -f as a negative value to post_option. */
305 flag_eliminate_unused_debug_types = -value;
309 gnat_argv[gnat_argc] = xstrdup ("-fRTS");
314 warning (0, "%<-gnat%> misspelled as %<-gant%>");
316 /* ... fall through ... */
319 /* Recopy the switches without the 'gnat' prefix. */
320 gnat_argv[gnat_argc] = xmalloc (strlen (arg) + 2);
321 gnat_argv[gnat_argc][0] = '-';
322 strcpy (gnat_argv[gnat_argc] + 1, arg);
327 gnat_argv[gnat_argc] = xstrdup ("-O");
329 gnat_argv[gnat_argc] = xstrdup (arg);
337 /* Initialize for option processing. */
340 gnat_init_options (unsigned int argc, const char **argv)
342 /* Initialize gnat_argv with save_argv size. */
343 gnat_argv = (char **) xmalloc ((argc + 1) * sizeof (argv[0]));
344 gnat_argv[0] = xstrdup (argv[0]); /* name of the command */
350 /* Uninitialized really means uninitialized in Ada. */
351 flag_zero_initialized_in_bss = 0;
356 /* Post-switch processing. */
359 gnat_post_options (const char **pfilename ATTRIBUTE_UNUSED)
361 flag_inline_trees = 1;
365 if (flag_inline_functions)
366 flag_inline_trees = 2;
368 /* Force eliminate_unused_debug_types to 0 unless an explicit positive
369 -f has been passed. This forces the default to 0 for Ada, which might
370 differ from the common default. */
371 if (flag_eliminate_unused_debug_types < 0)
372 flag_eliminate_unused_debug_types = 1;
374 flag_eliminate_unused_debug_types = 0;
379 /* Here is the function to handle the compiler error processing in GCC. */
382 internal_error_function (const char *msgid, va_list *ap)
385 char *buffer, *p, *loc;
386 String_Template temp, temp_loc;
387 Fat_Pointer fp, fp_loc;
390 /* Reset the pretty-printer. */
391 pp_clear_output_area (global_dc->printer);
393 /* Format the message into the pretty-printer. */
394 tinfo.format_spec = msgid;
396 tinfo.err_no = errno;
397 pp_format_verbatim (global_dc->printer, &tinfo);
399 /* Extract a (writable) pointer to the formatted text. */
400 buffer = (char*) pp_formatted_text (global_dc->printer);
402 /* Go up to the first newline. */
403 for (p = buffer; *p; p++)
411 temp.High_Bound = p - buffer;
415 s = expand_location (input_location);
416 #ifdef USE_MAPPED_LOCATION
417 if (flag_show_column && s.column != 0)
418 asprintf (&loc, "%s:%d:%d", s.file, s.line, s.column);
421 asprintf (&loc, "%s:%d", s.file, s.line);
422 temp_loc.Low_Bound = 1;
423 temp_loc.High_Bound = strlen (loc);
424 fp_loc.Bounds = &temp_loc;
427 Current_Error_Node = error_gnat_node;
428 Compiler_Abort (fp, -1, fp_loc);
431 /* Perform all the initialization steps that are language-specific. */
436 /* Initialize translations and the outer statement group. */
437 gnat_init_stmt_group ();
439 /* Performs whatever initialization steps needed by the language-dependent
441 gnat_init_decl_processing ();
443 /* Add the input filename as the last argument. */
444 gnat_argv[gnat_argc] = (char *) main_input_filename;
446 gnat_argv[gnat_argc] = 0;
448 global_dc->internal_error = &internal_error_function;
450 /* Show that REFERENCE_TYPEs are internal and should be Pmode. */
451 internal_reference_types ();
453 set_lang_adjust_rli (gnat_adjust_rli);
458 /* This function is called indirectly from toplev.c to handle incomplete
459 declarations, i.e. VAR_DECL nodes whose DECL_SIZE is zero. To be precise,
460 compile_file in toplev.c makes an indirect call through the function pointer
461 incomplete_decl_finalize_hook which is initialized to this routine in
462 init_decl_processing. */
465 gnat_finish_incomplete_decl (tree dont_care ATTRIBUTE_UNUSED)
470 /* Compute the alignment of the largest mode that can be used for copying
474 gnat_compute_largest_alignment (void)
476 enum machine_mode mode;
478 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
479 mode = GET_MODE_WIDER_MODE (mode))
480 if (optab_handler (mov_optab, mode)->insn_code != CODE_FOR_nothing)
481 largest_move_alignment = MIN (BIGGEST_ALIGNMENT,
482 MAX (largest_move_alignment,
483 GET_MODE_ALIGNMENT (mode)));
486 /* If we are using the GCC mechanism to process exception handling, we
487 have to register the personality routine for Ada and to initialize
488 various language dependent hooks. */
491 gnat_init_gcc_eh (void)
493 #ifdef DWARF2_UNWIND_INFO
494 /* lang_dependent_init already called dwarf2out_frame_init if true. */
495 int dwarf2out_frame_initialized = dwarf2out_do_frame ();
498 /* We shouldn't do anything if the No_Exceptions_Handler pragma is set,
499 though. This could for instance lead to the emission of tables with
500 references to symbols (such as the Ada eh personality routine) within
501 libraries we won't link against. */
502 if (No_Exception_Handlers_Set ())
505 /* Tell GCC we are handling cleanup actions through exception propagation.
506 This opens possibilities that we don't take advantage of yet, but is
507 nonetheless necessary to ensure that fixup code gets assigned to the
508 right exception regions. */
509 using_eh_for_cleanups ();
511 eh_personality_libfunc = init_one_libfunc (USING_SJLJ_EXCEPTIONS
512 ? "__gnat_eh_personality_sj"
513 : "__gnat_eh_personality");
514 lang_eh_type_covers = gnat_eh_type_covers;
515 lang_eh_runtime_type = gnat_return_tree;
516 default_init_unwind_resume_libfunc ();
518 /* Turn on -fexceptions and -fnon-call-exceptions. The first one triggers
519 the generation of the necessary exception runtime tables. The second one
520 is useful for two reasons: 1/ we map some asynchronous signals like SEGV
521 to exceptions, so we need to ensure that the insns which can lead to such
522 signals are correctly attached to the exception region they pertain to,
523 2/ Some calls to pure subprograms are handled as libcall blocks and then
524 marked as "cannot trap" if the flag is not set (see emit_libcall_block).
525 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_printable_name (tree decl, int verbosity)
617 const char *coded_name = IDENTIFIER_POINTER (DECL_NAME (decl));
618 char *ada_name = (char *) ggc_alloc (strlen (coded_name) * 2 + 60);
620 __gnat_decode (coded_name, ada_name, 0);
624 Set_Identifier_Casing (ada_name, (char *) DECL_SOURCE_FILE (decl));
625 ada_name = Name_Buffer;
628 return (const char *) ada_name;
632 gnat_dwarf_name (tree t, int verbosity ATTRIBUTE_UNUSED)
634 gcc_assert (DECL_P (t));
636 return (const char *) IDENTIFIER_POINTER (DECL_NAME (t));
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 /* Adjusts the RLI used to layout a record after all the fields have been
679 added. We only handle the packed case and cause it to use the alignment
680 that will pad the record at the end. */
683 gnat_adjust_rli (record_layout_info rli ATTRIBUTE_UNUSED)
686 /* ??? This code seems to have no actual effect; record_align should already
687 reflect the largest alignment desired by a field. jason 2003-04-01 */
688 unsigned int record_align = rli->unpadded_align;
691 /* If an alignment has been specified, don't use anything larger unless we
693 if (TYPE_ALIGN (rli->t) != 0 && TYPE_ALIGN (rli->t) < record_align)
694 record_align = MAX (rli->record_align, TYPE_ALIGN (rli->t));
696 /* If any fields have variable size, we need to force the record to be at
697 least as aligned as the alignment of that type. */
698 for (field = TYPE_FIELDS (rli->t); field; field = TREE_CHAIN (field))
699 if (TREE_CODE (DECL_SIZE_UNIT (field)) != INTEGER_CST)
700 record_align = MAX (record_align, DECL_ALIGN (field));
702 if (TYPE_PACKED (rli->t))
703 rli->record_align = record_align;
707 /* Do nothing (return the tree node passed). */
710 gnat_return_tree (tree t)
715 /* Return true if type A catches type B. Callback for flow analysis from
716 the exception handling part of the back-end. */
719 gnat_eh_type_covers (tree a, tree b)
721 /* a catches b if they represent the same exception id or if a
724 ??? integer_zero_node for "others" is hardwired in too many places
726 return (a == b || a == integer_zero_node);
729 /* Get the alias set corresponding to a type or expression. */
731 static alias_set_type
732 gnat_get_alias_set (tree type)
734 /* If this is a padding type, use the type of the first field. */
735 if (TREE_CODE (type) == RECORD_TYPE
736 && TYPE_IS_PADDING_P (type))
737 return get_alias_set (TREE_TYPE (TYPE_FIELDS (type)));
739 /* If the type is an unconstrained array, use the type of the
740 self-referential array we make. */
741 else if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)
743 get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))));
745 /* If the type can alias any other types, return the alias set 0. */
746 else if (TYPE_P (type)
747 && TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (type)))
753 /* GNU_TYPE is a type. Return its maximum size in bytes, if known,
754 as a constant when possible. */
757 gnat_type_max_size (const_tree gnu_type)
759 /* First see what we can get from TYPE_SIZE_UNIT, which might not
760 be constant even for simple expressions if it has already been
761 elaborated and possibly replaced by a VAR_DECL. */
762 tree max_unitsize = max_size (TYPE_SIZE_UNIT (gnu_type), true);
764 /* If we don't have a constant, see what we can get from TYPE_ADA_SIZE,
765 which should stay untouched. */
766 if (!host_integerp (max_unitsize, 1)
767 && (TREE_CODE (gnu_type) == RECORD_TYPE
768 || TREE_CODE (gnu_type) == UNION_TYPE
769 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
770 && TYPE_ADA_SIZE (gnu_type))
772 tree max_adasize = max_size (TYPE_ADA_SIZE (gnu_type), true);
774 /* If we have succeeded in finding a constant, round it up to the
775 type's alignment and return the result in units. */
776 if (host_integerp (max_adasize, 1))
778 = size_binop (CEIL_DIV_EXPR,
779 round_up (max_adasize, TYPE_ALIGN (gnu_type)),
786 /* GNU_TYPE is a type. Determine if it should be passed by reference by
790 default_pass_by_ref (tree gnu_type)
792 /* We pass aggregates by reference if they are sufficiently large. The
793 choice of constant here is somewhat arbitrary. We also pass by
794 reference if the target machine would either pass or return by
795 reference. Strictly speaking, we need only check the return if this
796 is an In Out parameter, but it's probably best to err on the side of
797 passing more things by reference. */
799 if (pass_by_reference (NULL, TYPE_MODE (gnu_type), gnu_type, 1))
802 if (targetm.calls.return_in_memory (gnu_type, NULL_TREE))
805 if (AGGREGATE_TYPE_P (gnu_type)
806 && (!host_integerp (TYPE_SIZE (gnu_type), 1)
807 || 0 < compare_tree_int (TYPE_SIZE (gnu_type),
808 8 * TYPE_ALIGN (gnu_type))))
814 /* GNU_TYPE is the type of a subprogram parameter. Determine from the type if
815 it should be passed by reference. */
818 must_pass_by_ref (tree gnu_type)
820 /* We pass only unconstrained objects, those required by the language
821 to be passed by reference, and objects of variable size. The latter
822 is more efficient, avoids problems with variable size temporaries,
823 and does not produce compatibility problems with C, since C does
824 not have such objects. */
825 return (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
826 || (AGGREGATE_TYPE_P (gnu_type) && TYPE_BY_REFERENCE_P (gnu_type))
827 || (TYPE_SIZE (gnu_type)
828 && TREE_CODE (TYPE_SIZE (gnu_type)) != INTEGER_CST));
831 /* This function is called by the front end to enumerate all the supported
832 modes for the machine. We pass a function which is called back with
833 the following integer parameters:
835 FLOAT_P nonzero if this represents a floating-point mode
836 COMPLEX_P nonzero is this represents a complex mode
837 COUNT count of number of items, nonzero for vector mode
838 PRECISION number of bits in data representation
839 MANTISSA number of bits in mantissa, if FP and known, else zero.
840 SIZE number of bits used to store data
841 ALIGN number of bits to which mode is aligned. */
844 enumerate_modes (void (*f) (int, int, int, int, int, int, unsigned int))
848 for (i = 0; i < NUM_MACHINE_MODES; i++)
856 enum machine_mode inner_mode = i;
858 switch (GET_MODE_CLASS (i))
865 case MODE_COMPLEX_INT:
867 inner_mode = GET_MODE_INNER (i);
869 case MODE_COMPLEX_FLOAT:
872 inner_mode = GET_MODE_INNER (i);
874 case MODE_VECTOR_INT:
876 inner_mode = GET_MODE_INNER (i);
878 case MODE_VECTOR_FLOAT:
881 inner_mode = GET_MODE_INNER (i);
887 /* Skip this mode if it's one the front end doesn't need to know about
888 (e.g., the CC modes) or if there is no add insn for that mode (or
889 any wider mode), meaning it is not supported by the hardware. If
890 this a complex or vector mode, we care about the inner mode. */
891 for (j = inner_mode; j != VOIDmode; j = GET_MODE_WIDER_MODE (j))
892 if (optab_handler (add_optab, j)->insn_code != CODE_FOR_nothing)
897 const struct real_format *fmt = REAL_MODE_FORMAT (inner_mode);
902 if (!skip_p && j != VOIDmode)
903 (*f) (float_p, complex_p, vector_p ? GET_MODE_NUNITS (i) : 0,
904 GET_MODE_BITSIZE (i), mantissa,
905 GET_MODE_SIZE (i) * BITS_PER_UNIT, GET_MODE_ALIGNMENT (i));
910 fp_prec_to_size (int prec)
912 enum machine_mode mode;
914 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
915 mode = GET_MODE_WIDER_MODE (mode))
916 if (GET_MODE_PRECISION (mode) == prec)
917 return GET_MODE_BITSIZE (mode);
923 fp_size_to_prec (int size)
925 enum machine_mode mode;
927 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
928 mode = GET_MODE_WIDER_MODE (mode))
929 if (GET_MODE_BITSIZE (mode) == size)
930 return GET_MODE_PRECISION (mode);