1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2006, 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 HOST_WIDE_INT 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_FINISH_INCOMPLETE_DECL
131 #define LANG_HOOKS_FINISH_INCOMPLETE_DECL gnat_finish_incomplete_decl
132 #undef LANG_HOOKS_REDUCE_BIT_FIELD_OPERATIONS
133 #define LANG_HOOKS_REDUCE_BIT_FIELD_OPERATIONS true
134 #undef LANG_HOOKS_GET_ALIAS_SET
135 #define LANG_HOOKS_GET_ALIAS_SET gnat_get_alias_set
136 #undef LANG_HOOKS_EXPAND_EXPR
137 #define LANG_HOOKS_EXPAND_EXPR gnat_expand_expr
138 #undef LANG_HOOKS_MARK_ADDRESSABLE
139 #define LANG_HOOKS_MARK_ADDRESSABLE gnat_mark_addressable
140 #undef LANG_HOOKS_PRINT_DECL
141 #define LANG_HOOKS_PRINT_DECL gnat_print_decl
142 #undef LANG_HOOKS_PRINT_TYPE
143 #define LANG_HOOKS_PRINT_TYPE gnat_print_type
144 #undef LANG_HOOKS_TYPE_MAX_SIZE
145 #define LANG_HOOKS_TYPE_MAX_SIZE gnat_type_max_size
146 #undef LANG_HOOKS_DECL_PRINTABLE_NAME
147 #define LANG_HOOKS_DECL_PRINTABLE_NAME gnat_printable_name
148 #undef LANG_HOOKS_DWARF_NAME
149 #define LANG_HOOKS_DWARF_NAME gnat_dwarf_name
150 #undef LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION
151 #define LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION gnat_expand_body
152 #undef LANG_HOOKS_GIMPLIFY_EXPR
153 #define LANG_HOOKS_GIMPLIFY_EXPR gnat_gimplify_expr
154 #undef LANG_HOOKS_TYPE_FOR_MODE
155 #define LANG_HOOKS_TYPE_FOR_MODE gnat_type_for_mode
156 #undef LANG_HOOKS_TYPE_FOR_SIZE
157 #define LANG_HOOKS_TYPE_FOR_SIZE gnat_type_for_size
158 #undef LANG_HOOKS_SIGNED_TYPE
159 #define LANG_HOOKS_SIGNED_TYPE gnat_signed_type
160 #undef LANG_HOOKS_UNSIGNED_TYPE
161 #define LANG_HOOKS_UNSIGNED_TYPE gnat_unsigned_type
162 #undef LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE
163 #define LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE gnat_signed_or_unsigned_type
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 a
236 bootstrap path problem. The call below should be removed at some point and
237 the seh pointer passed to __gnat_initialize() above. */
239 __gnat_install_SEH_handler((void *)seh);
241 /* Call the front-end elaboration procedures */
244 /* Call the front end */
247 cgraph_finalize_compilation_unit ();
251 /* Decode all the language specific options that cannot be decoded by GCC.
252 The option decoding phase of GCC calls this routine on the flags that
253 it cannot decode. This routine returns the number of consecutive arguments
254 from ARGV that it successfully decoded; 0 indicates failure. */
257 gnat_handle_option (size_t scode, const char *arg, int value ATTRIBUTE_UNUSED)
259 const struct cl_option *option = &cl_options[scode];
260 enum opt_code code = (enum opt_code) scode;
263 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
265 error ("missing argument to \"-%s\"", option->opt_text);
275 q = xmalloc (sizeof("-I") + strlen (arg));
278 gnat_argv[gnat_argc] = q;
282 /* All front ends are expected to accept this. */
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");
305 gnat_argv[gnat_argc] = xstrdup ("-fRTS");
310 warning (0, "%<-gnat%> misspelled as %<-gant%>");
312 /* ... fall through ... */
315 /* Recopy the switches without the 'gnat' prefix. */
316 gnat_argv[gnat_argc] = xmalloc (strlen (arg) + 2);
317 gnat_argv[gnat_argc][0] = '-';
318 strcpy (gnat_argv[gnat_argc] + 1, arg);
323 gnat_argv[gnat_argc] = xstrdup ("-O");
325 gnat_argv[gnat_argc] = xstrdup (arg);
333 /* Initialize for option processing. */
336 gnat_init_options (unsigned int argc, const char **argv)
338 /* Initialize gnat_argv with save_argv size. */
339 gnat_argv = (char **) xmalloc ((argc + 1) * sizeof (argv[0]));
340 gnat_argv[0] = xstrdup (argv[0]); /* name of the command */
346 /* Uninitialized really means uninitialized in Ada. */
347 flag_zero_initialized_in_bss = 0;
352 /* Post-switch processing. */
355 gnat_post_options (const char **pfilename ATTRIBUTE_UNUSED)
357 flag_inline_trees = 1;
361 if (flag_inline_functions)
362 flag_inline_trees = 2;
364 flag_tree_salias = 0;
369 /* Here is the function to handle the compiler error processing in GCC. */
372 internal_error_function (const char *msgid, va_list *ap)
377 String_Template temp;
380 /* Reset the pretty-printer. */
381 pp_clear_output_area (global_dc->printer);
383 /* Format the message into the pretty-printer. */
384 tinfo.format_spec = msgid;
386 tinfo.err_no = errno;
387 pp_format_verbatim (global_dc->printer, &tinfo);
389 /* Extract a (writable) pointer to the formatted text. */
390 buffer = (char*) pp_formatted_text (global_dc->printer);
392 /* Go up to the first newline. */
393 for (p = buffer; *p; p++)
401 temp.High_Bound = p - buffer;
405 Current_Error_Node = error_gnat_node;
406 Compiler_Abort (fp, -1);
409 /* Perform all the initialization steps that are language-specific. */
414 /* Initialize translations and the outer statement group. */
415 gnat_init_stmt_group ();
417 /* Performs whatever initialization steps needed by the language-dependent
419 gnat_init_decl_processing ();
421 /* Add the input filename as the last argument. */
422 gnat_argv[gnat_argc] = (char *) main_input_filename;
424 gnat_argv[gnat_argc] = 0;
426 global_dc->internal_error = &internal_error_function;
428 /* Show that REFERENCE_TYPEs are internal and should be Pmode. */
429 internal_reference_types ();
431 set_lang_adjust_rli (gnat_adjust_rli);
436 /* This function is called indirectly from toplev.c to handle incomplete
437 declarations, i.e. VAR_DECL nodes whose DECL_SIZE is zero. To be precise,
438 compile_file in toplev.c makes an indirect call through the function pointer
439 incomplete_decl_finalize_hook which is initialized to this routine in
440 init_decl_processing. */
443 gnat_finish_incomplete_decl (tree dont_care ATTRIBUTE_UNUSED)
448 /* Compute the alignment of the largest mode that can be used for copying
452 gnat_compute_largest_alignment (void)
454 enum machine_mode mode;
456 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
457 mode = GET_MODE_WIDER_MODE (mode))
458 if (mov_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing)
459 largest_move_alignment = MIN (BIGGEST_ALIGNMENT,
460 MAX (largest_move_alignment,
461 GET_MODE_ALIGNMENT (mode)));
464 /* If we are using the GCC mechanism to process exception handling, we
465 have to register the personality routine for Ada and to initialize
466 various language dependent hooks. */
469 gnat_init_gcc_eh (void)
471 /* We shouldn't do anything if the No_Exceptions_Handler pragma is set,
472 though. This could for instance lead to the emission of tables with
473 references to symbols (such as the Ada eh personality routine) within
474 libraries we won't link against. */
475 if (No_Exception_Handlers_Set ())
478 /* Tell GCC we are handling cleanup actions through exception propagation.
479 This opens possibilities that we don't take advantage of yet, but is
480 nonetheless necessary to ensure that fixup code gets assigned to the
481 right exception regions. */
482 using_eh_for_cleanups ();
484 eh_personality_libfunc = init_one_libfunc ("__gnat_eh_personality");
485 lang_eh_type_covers = gnat_eh_type_covers;
486 lang_eh_runtime_type = gnat_eh_runtime_type;
487 default_init_unwind_resume_libfunc ();
489 /* Turn on -fexceptions and -fnon-call-exceptions. The first one triggers
490 the generation of the necessary exception runtime tables. The second one
491 is useful for two reasons: 1/ we map some asynchronous signals like SEGV
492 to exceptions, so we need to ensure that the insns which can lead to such
493 signals are correctly attached to the exception region they pertain to,
494 2/ Some calls to pure subprograms are handled as libcall blocks and then
495 marked as "cannot trap" if the flag is not set (see emit_libcall_block).
496 We should not let this be since it is possible for such calls to actually
500 flag_non_call_exceptions = 1;
503 #ifdef DWARF2_UNWIND_INFO
504 if (dwarf2out_do_frame ())
505 dwarf2out_frame_init ();
509 /* Language hooks, first one to print language-specific items in a DECL. */
512 gnat_print_decl (FILE *file, tree node, int indent)
514 switch (TREE_CODE (node))
517 print_node (file, "const_corresponding_var",
518 DECL_CONST_CORRESPONDING_VAR (node), indent + 4);
522 print_node (file, "original_field", DECL_ORIGINAL_FIELD (node),
527 print_node (file, "renamed_object", DECL_RENAMED_OBJECT (node),
537 gnat_print_type (FILE *file, tree node, int indent)
539 switch (TREE_CODE (node))
542 print_node (file, "ci_co_list", TYPE_CI_CO_LIST (node), indent + 4);
546 print_node (file, "RM size", TYPE_RM_SIZE_NUM (node), indent + 4);
550 if (TYPE_MODULAR_P (node))
551 print_node (file, "modulus", TYPE_MODULUS (node), indent + 4);
552 else if (TYPE_HAS_ACTUAL_BOUNDS_P (node))
553 print_node (file, "actual bounds", TYPE_ACTUAL_BOUNDS (node),
555 else if (TYPE_VAX_FLOATING_POINT_P (node))
558 print_node (file, "index type", TYPE_INDEX_TYPE (node), indent + 4);
560 print_node (file, "RM size", TYPE_RM_SIZE_NUM (node), indent + 4);
564 print_node (file,"actual bounds", TYPE_ACTUAL_BOUNDS (node), indent + 4);
568 if (TYPE_IS_FAT_POINTER_P (node) || TYPE_CONTAINS_TEMPLATE_P (node))
569 print_node (file, "unconstrained array",
570 TYPE_UNCONSTRAINED_ARRAY (node), indent + 4);
572 print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4);
576 case QUAL_UNION_TYPE:
577 print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4);
586 gnat_printable_name (tree decl, int verbosity)
588 const char *coded_name = IDENTIFIER_POINTER (DECL_NAME (decl));
589 char *ada_name = (char *) ggc_alloc (strlen (coded_name) * 2 + 60);
591 __gnat_decode (coded_name, ada_name, 0);
595 Set_Identifier_Casing (ada_name, (char *) DECL_SOURCE_FILE (decl));
596 ada_name = Name_Buffer;
599 return (const char *) ada_name;
603 gnat_dwarf_name (tree t, int verbosity ATTRIBUTE_UNUSED)
605 gcc_assert (DECL_P (t));
607 return (const char *) IDENTIFIER_POINTER (DECL_NAME (t));
610 /* Expands GNAT-specific GCC tree nodes. The only ones we support
611 here are and NULL_EXPR. */
614 gnat_expand_expr (tree exp, rtx target, enum machine_mode tmode,
615 int modifier, rtx *alt_rtl)
617 tree type = TREE_TYPE (exp);
620 /* If this is a statement, call the expansion routine for statements. */
623 gnat_expand_stmt (exp);
627 /* Update EXP to be the new expression to expand. */
628 switch (TREE_CODE (exp))
633 allocate_dynamic_stack_space
634 (expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, TYPE_MODE (sizetype),
636 NULL_RTX, tree_low_cst (TREE_OPERAND (exp, 1), 1));
639 case UNCONSTRAINED_ARRAY_REF:
640 /* If we are evaluating just for side-effects, just evaluate our
641 operand. Otherwise, abort since this code should never appear
642 in a tree to be evaluated (objects aren't unconstrained). */
643 if (target == const0_rtx || TREE_CODE (type) == VOID_TYPE)
644 return expand_expr (TREE_OPERAND (exp, 0), const0_rtx,
647 /* ... fall through ... */
653 return expand_expr_real (new, target, tmode, modifier, alt_rtl);
656 /* Generate the RTL for the body of GNU_DECL. */
659 gnat_expand_body (tree gnu_decl)
661 if (!DECL_INITIAL (gnu_decl) || DECL_INITIAL (gnu_decl) == error_mark_node)
664 tree_rest_of_compilation (gnu_decl);
666 if (DECL_STATIC_CONSTRUCTOR (gnu_decl) && targetm.have_ctors_dtors)
667 targetm.asm_out.constructor (XEXP (DECL_RTL (gnu_decl), 0),
668 DEFAULT_INIT_PRIORITY);
670 if (DECL_STATIC_DESTRUCTOR (gnu_decl) && targetm.have_ctors_dtors)
671 targetm.asm_out.destructor (XEXP (DECL_RTL (gnu_decl), 0),
672 DEFAULT_INIT_PRIORITY);
675 /* Adjusts the RLI used to layout a record after all the fields have been
676 added. We only handle the packed case and cause it to use the alignment
677 that will pad the record at the end. */
680 gnat_adjust_rli (record_layout_info rli ATTRIBUTE_UNUSED)
683 /* ??? This code seems to have no actual effect; record_align should already
684 reflect the largest alignment desired by a field. jason 2003-04-01 */
685 unsigned int record_align = rli->unpadded_align;
688 /* If an alignment has been specified, don't use anything larger unless we
690 if (TYPE_ALIGN (rli->t) != 0 && TYPE_ALIGN (rli->t) < record_align)
691 record_align = MAX (rli->record_align, TYPE_ALIGN (rli->t));
693 /* If any fields have variable size, we need to force the record to be at
694 least as aligned as the alignment of that type. */
695 for (field = TYPE_FIELDS (rli->t); field; field = TREE_CHAIN (field))
696 if (TREE_CODE (DECL_SIZE_UNIT (field)) != INTEGER_CST)
697 record_align = MAX (record_align, DECL_ALIGN (field));
699 if (TYPE_PACKED (rli->t))
700 rli->record_align = record_align;
704 /* These routines are used in conjunction with GCC exception handling. */
706 /* Map compile-time to run-time tree for GCC exception handling scheme. */
709 gnat_eh_runtime_type (tree type)
714 /* Return true if type A catches type B. Callback for flow analysis from
715 the exception handling part of the back-end. */
718 gnat_eh_type_covers (tree a, tree b)
720 /* a catches b if they represent the same exception id or if a
723 ??? integer_zero_node for "others" is hardwired in too many places
725 return (a == b || a == integer_zero_node);
728 /* Get the alias set corresponding to a type or expression. */
731 gnat_get_alias_set (tree type)
733 /* If this is a padding type, use the type of the first field. */
734 if (TREE_CODE (type) == RECORD_TYPE
735 && TYPE_IS_PADDING_P (type))
736 return get_alias_set (TREE_TYPE (TYPE_FIELDS (type)));
738 /* If the type is an unconstrained array, use the type of the
739 self-referential array we make. */
740 else if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)
742 get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))));
748 /* GNU_TYPE is a type. Return its maxium size in bytes, if known,
749 as a constant when possible. */
752 gnat_type_max_size (tree gnu_type)
754 /* First see what we can get from TYPE_SIZE_UNIT, which might not be
755 constant even for simple expressions if it has already been gimplified
756 and replaced by a VAR_DECL. */
758 tree max_unitsize = max_size (TYPE_SIZE_UNIT (gnu_type), true);
760 /* If we don't have a constant, see what we can get from TYPE_ADA_SIZE,
761 typically not gimplified. */
763 if (!host_integerp (max_unitsize, 1)
764 && (TREE_CODE (gnu_type) == RECORD_TYPE
765 || TREE_CODE (gnu_type) == UNION_TYPE
766 || TREE_CODE (gnu_type) == QUAL_UNION_TYPE)
767 && TYPE_ADA_SIZE (gnu_type))
769 tree max_adasize = max_size (TYPE_ADA_SIZE (gnu_type), true);
771 /* If we have succeded in finding a constant, round it up to the
772 type's alignment and return the result in byte units. */
774 if (host_integerp (max_adasize, 1))
776 = size_binop (CEIL_DIV_EXPR,
777 round_up (max_adasize, TYPE_ALIGN (gnu_type)),
784 /* GNU_TYPE is a type. Determine if it should be passed by reference by
788 default_pass_by_ref (tree gnu_type)
790 /* We pass aggregates by reference if they are sufficiently large. The
791 choice of constant here is somewhat arbitrary. We also pass by
792 reference if the target machine would either pass or return by
793 reference. Strictly speaking, we need only check the return if this
794 is an In Out parameter, but it's probably best to err on the side of
795 passing more things by reference. */
797 if (pass_by_reference (NULL, TYPE_MODE (gnu_type), gnu_type, 1))
800 if (targetm.calls.return_in_memory (gnu_type, NULL_TREE))
803 if (AGGREGATE_TYPE_P (gnu_type)
804 && (!host_integerp (TYPE_SIZE (gnu_type), 1)
805 || 0 < compare_tree_int (TYPE_SIZE (gnu_type),
806 8 * TYPE_ALIGN (gnu_type))))
812 /* GNU_TYPE is the type of a subprogram parameter. Determine from the type if
813 it should be passed by reference. */
816 must_pass_by_ref (tree gnu_type)
818 /* We pass only unconstrained objects, those required by the language
819 to be passed by reference, and objects of variable size. The latter
820 is more efficient, avoids problems with variable size temporaries,
821 and does not produce compatibility problems with C, since C does
822 not have such objects. */
823 return (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
824 || (AGGREGATE_TYPE_P (gnu_type) && TYPE_BY_REFERENCE_P (gnu_type))
825 || (TYPE_SIZE (gnu_type)
826 && TREE_CODE (TYPE_SIZE (gnu_type)) != INTEGER_CST));
829 /* This function is called by the front end to enumerate all the supported
830 modes for the machine. We pass a function which is called back with
831 the following integer parameters:
833 FLOAT_P nonzero if this represents a floating-point mode
834 COMPLEX_P nonzero is this represents a complex mode
835 COUNT count of number of items, nonzero for vector mode
836 PRECISION number of bits in data representation
837 MANTISSA number of bits in mantissa, if FP and known, else zero.
838 SIZE number of bits used to store data
839 ALIGN number of bits to which mode is aligned. */
842 enumerate_modes (void (*f) (int, int, int, int, int, int, unsigned int))
846 for (i = 0; i < NUM_MACHINE_MODES; i++)
854 enum machine_mode inner_mode = i;
856 switch (GET_MODE_CLASS (i))
863 case MODE_COMPLEX_INT:
865 inner_mode = GET_MODE_INNER (i);
867 case MODE_COMPLEX_FLOAT:
870 inner_mode = GET_MODE_INNER (i);
872 case MODE_VECTOR_INT:
874 inner_mode = GET_MODE_INNER (i);
876 case MODE_VECTOR_FLOAT:
879 inner_mode = GET_MODE_INNER (i);
885 /* Skip this mode if it's one the front end doesn't need to know about
886 (e.g., the CC modes) or if there is no add insn for that mode (or
887 any wider mode), meaning it is not supported by the hardware. If
888 this a complex or vector mode, we care about the inner mode. */
889 for (j = inner_mode; j != VOIDmode; j = GET_MODE_WIDER_MODE (j))
890 if (add_optab->handlers[j].insn_code != CODE_FOR_nothing)
895 const struct real_format *fmt = REAL_MODE_FORMAT (inner_mode);
897 mantissa = fmt->p * fmt->log2_b;
900 if (!skip_p && j != VOIDmode)
901 (*f) (float_p, complex_p, vector_p ? GET_MODE_NUNITS (i) : 0,
902 GET_MODE_BITSIZE (i), mantissa,
903 GET_MODE_SIZE (i) * BITS_PER_UNIT, GET_MODE_ALIGNMENT (i));
908 fp_prec_to_size (int prec)
910 enum machine_mode mode;
912 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
913 mode = GET_MODE_WIDER_MODE (mode))
914 if (GET_MODE_PRECISION (mode) == prec)
915 return GET_MODE_BITSIZE (mode);
921 fp_size_to_prec (int size)
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_BITSIZE (mode) == size)
928 return GET_MODE_PRECISION (mode);