1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
10 * Copyright (C) 1992-2002 Free Software Foundation, Inc. *
12 * GNAT is free software; you can redistribute it and/or modify it under *
13 * terms of the GNU General Public License as published by the Free Soft- *
14 * ware Foundation; either version 2, or (at your option) any later ver- *
15 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
16 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
17 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
18 * for more details. You should have received a copy of the GNU General *
19 * Public License distributed with GNAT; see file COPYING. If not, write *
20 * to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, *
21 * MA 02111-1307, USA. *
23 * As a special exception, if you link this file with other files to *
24 * produce an executable, this file does not by itself cause the resulting *
25 * executable to be covered by the GNU General Public License. This except- *
26 * ion does not however invalidate any other reasons why the executable *
27 * file might be covered by the GNU Public License. *
29 * GNAT was originally developed by the GNAT team at New York University. *
30 * Extensive contributions were provided by Ada Core Technologies Inc. *
32 ****************************************************************************/
34 /* This file contains parts of the compiler that are required for interfacing
35 with GCC but otherwise do nothing and parts of Gigi that need to know
40 #include "coretypes.h"
45 #include "diagnostic.h"
51 #include "insn-codes.h"
52 #include "insn-flags.h"
53 #include "insn-config.h"
60 #include "langhooks.h"
61 #include "langhooks-def.h"
76 #include "adadecode.h"
80 extern FILE *asm_out_file;
82 extern char **save_argv;
84 static size_t gnat_tree_size PARAMS ((enum tree_code));
85 static bool gnat_init PARAMS ((void));
86 static int gnat_init_options PARAMS ((void));
87 static int gnat_handle_option (size_t scode, const char *arg, int value);
88 static HOST_WIDE_INT gnat_get_alias_set PARAMS ((tree));
89 static void gnat_print_decl PARAMS ((FILE *, tree, int));
90 static void gnat_print_type PARAMS ((FILE *, tree, int));
91 static const char *gnat_printable_name PARAMS ((tree, int));
92 static tree gnat_eh_runtime_type PARAMS ((tree));
93 static int gnat_eh_type_covers PARAMS ((tree, tree));
94 static void gnat_parse_file PARAMS ((int));
95 static rtx gnat_expand_expr PARAMS ((tree, rtx, enum machine_mode,
98 /* Structure giving our language-specific hooks. */
100 #undef LANG_HOOKS_NAME
101 #define LANG_HOOKS_NAME "GNU Ada"
102 #undef LANG_HOOKS_IDENTIFIER_SIZE
103 #define LANG_HOOKS_IDENTIFIER_SIZE sizeof (struct tree_identifier)
104 #undef LANG_HOOKS_TREE_SIZE
105 #define LANG_HOOKS_TREE_SIZE gnat_tree_size
106 #undef LANG_HOOKS_INIT
107 #define LANG_HOOKS_INIT gnat_init
108 #undef LANG_HOOKS_INIT_OPTIONS
109 #define LANG_HOOKS_INIT_OPTIONS gnat_init_options
110 #undef LANG_HOOKS_HANDLE_OPTION
111 #define LANG_HOOKS_HANDLE_OPTION gnat_handle_option
112 #undef LANG_HOOKS_PARSE_FILE
113 #define LANG_HOOKS_PARSE_FILE gnat_parse_file
114 #undef LANG_HOOKS_HONOR_READONLY
115 #define LANG_HOOKS_HONOR_READONLY 1
116 #undef LANG_HOOKS_FINISH_INCOMPLETE_DECL
117 #define LANG_HOOKS_FINISH_INCOMPLETE_DECL gnat_finish_incomplete_decl
118 #undef LANG_HOOKS_GET_ALIAS_SET
119 #define LANG_HOOKS_GET_ALIAS_SET gnat_get_alias_set
120 #undef LANG_HOOKS_EXPAND_EXPR
121 #define LANG_HOOKS_EXPAND_EXPR gnat_expand_expr
122 #undef LANG_HOOKS_MARK_ADDRESSABLE
123 #define LANG_HOOKS_MARK_ADDRESSABLE gnat_mark_addressable
124 #undef LANG_HOOKS_TRUTHVALUE_CONVERSION
125 #define LANG_HOOKS_TRUTHVALUE_CONVERSION gnat_truthvalue_conversion
126 #undef LANG_HOOKS_PRINT_DECL
127 #define LANG_HOOKS_PRINT_DECL gnat_print_decl
128 #undef LANG_HOOKS_PRINT_TYPE
129 #define LANG_HOOKS_PRINT_TYPE gnat_print_type
130 #undef LANG_HOOKS_DECL_PRINTABLE_NAME
131 #define LANG_HOOKS_DECL_PRINTABLE_NAME gnat_printable_name
132 #undef LANG_HOOKS_TYPE_FOR_MODE
133 #define LANG_HOOKS_TYPE_FOR_MODE gnat_type_for_mode
134 #undef LANG_HOOKS_TYPE_FOR_SIZE
135 #define LANG_HOOKS_TYPE_FOR_SIZE gnat_type_for_size
136 #undef LANG_HOOKS_SIGNED_TYPE
137 #define LANG_HOOKS_SIGNED_TYPE gnat_signed_type
138 #undef LANG_HOOKS_UNSIGNED_TYPE
139 #define LANG_HOOKS_UNSIGNED_TYPE gnat_unsigned_type
140 #undef LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE
141 #define LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE gnat_signed_or_unsigned_type
143 const struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
145 /* Tables describing GCC tree codes used only by GNAT.
147 Table indexed by tree code giving a string containing a character
148 classifying the tree code. Possibilities are
149 t, d, s, c, r, <, 1 and 2. See cp-tree.def for details. */
151 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
153 const char tree_code_type[] = {
156 #include "ada-tree.def"
160 /* Table indexed by tree code giving number of expression
161 operands beyond the fixed part of the node structure.
162 Not used for types or decls. */
164 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
166 const unsigned char tree_code_length[] = {
169 #include "ada-tree.def"
173 /* Names of tree components.
174 Used for printing out the tree and error messages. */
175 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
177 const char *const tree_code_name[] = {
180 #include "ada-tree.def"
184 /* gnat standard argc argv */
186 extern int gnat_argc;
187 extern char **gnat_argv;
189 static void internal_error_function PARAMS ((const char *, va_list *));
190 static void gnat_adjust_rli PARAMS ((record_layout_info));
192 /* Declare functions we use as part of startup. */
193 extern void __gnat_initialize PARAMS((void));
194 extern void adainit PARAMS((void));
195 extern void _ada_gnat1drv PARAMS((void));
197 /* The parser for the language. For us, we process the GNAT tree. */
200 gnat_parse_file (set_yydebug)
201 int set_yydebug ATTRIBUTE_UNUSED;
203 /* call the target specific initializations */
206 /* Call the front-end elaboration procedures */
209 immediate_size_expand = 1;
211 /* Call the front end */
215 /* Decode all the language specific options that cannot be decoded by GCC.
216 The option decoding phase of GCC calls this routine on the flags that
217 it cannot decode. This routine returns the number of consecutive arguments
218 from ARGV that it successfully decoded; 0 indicates failure. */
221 gnat_handle_option (size_t scode, const char *arg, int value ATTRIBUTE_UNUSED)
223 const struct cl_option *option = &cl_options[scode];
224 enum opt_code code = (enum opt_code) scode;
228 /* Ignore file names. */
232 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
234 error ("missing argument to \"-%s\"", option->opt_text);
241 q = xmalloc (sizeof("-I") + strlen (arg));
244 gnat_argv[gnat_argc] = q;
249 gnat_argv[gnat_argc] = "-fRTS";
254 warning ("`-gnat' misspelled as `-gant'");
258 /* Recopy the switches without the 'gnat' prefix */
259 gnat_argv[gnat_argc] = xmalloc (strlen (arg) + 2);
260 gnat_argv[gnat_argc][0] = '-';
261 strcpy (gnat_argv[gnat_argc] + 1, arg);
265 for (i = 1; i < save_argc - 1; i++)
266 if (!strncmp (save_argv[i], "-gnatO", 6))
267 if (save_argv[++i][0] != '-')
269 /* Preserve output filename as GCC doesn't save it for GNAT. */
270 gnat_argv[gnat_argc] = save_argv[i];
280 /* Initialize for option processing. */
285 /* Initialize gnat_argv with save_argv size */
286 gnat_argv = (char **) xmalloc ((save_argc + 1) * sizeof (gnat_argv[0]));
287 gnat_argv[0] = save_argv[0]; /* name of the command */
293 /* Here is the function to handle the compiler error processing in GCC. */
296 internal_error_function (msgid, ap)
300 char buffer[1000]; /* Assume this is big enough. */
302 String_Template temp;
305 vsprintf (buffer, msgid, *ap);
307 /* Go up to the first newline. */
308 for (p = buffer; *p != 0; p++)
315 temp.Low_Bound = 1, temp.High_Bound = strlen (buffer);
316 fp.Array = buffer, fp.Bounds = &temp;
318 Current_Error_Node = error_gnat_node;
319 Compiler_Abort (fp, -1);
322 /* Langhook for tree_size: determine size of our 'x' and 'c' nodes. */
324 gnat_tree_size (enum tree_code code)
328 case GNAT_LOOP_ID: return sizeof (struct tree_loop_id);
335 /* Perform all the initialization steps that are language-specific. */
340 /* Performs whatever initialization steps needed by the language-dependent
343 Define the additional tree codes here. This isn't the best place to put
344 it, but it's where g++ does it. */
346 gnat_init_decl_processing ();
348 /* Add the input filename as the last argument. */
349 gnat_argv[gnat_argc] = (char *) main_input_filename;
351 gnat_argv[gnat_argc] = 0;
353 global_dc->internal_error = &internal_error_function;
355 /* Show that REFERENCE_TYPEs are internal and should be Pmode. */
356 internal_reference_types ();
358 set_lang_adjust_rli (gnat_adjust_rli);
363 /* If we are using the GCC mechanism for to process exception handling, we
364 have to register the personality routine for Ada and to initialize
365 various language dependent hooks. */
370 /* We shouldn't do anything if the No_Exceptions_Handler pragma is set,
371 though. This could for instance lead to the emission of tables with
372 references to symbols (such as the Ada eh personality routine) within
373 libraries we won't link against. */
374 if (No_Exception_Handlers_Set ())
377 eh_personality_libfunc = init_one_libfunc ("__gnat_eh_personality");
378 lang_eh_type_covers = gnat_eh_type_covers;
379 lang_eh_runtime_type = gnat_eh_runtime_type;
383 #ifdef DWARF2_UNWIND_INFO
384 if (dwarf2out_do_frame ())
385 dwarf2out_frame_init ();
389 /* Hooks for print-tree.c: */
392 gnat_print_decl (file, node, indent)
397 switch (TREE_CODE (node))
400 print_node (file, "const_corresponding_var",
401 DECL_CONST_CORRESPONDING_VAR (node), indent + 4);
405 print_node (file, "original field", DECL_ORIGINAL_FIELD (node),
415 gnat_print_type (file, node, indent)
420 switch (TREE_CODE (node))
423 print_node (file, "ci_co_list", TYPE_CI_CO_LIST (node), indent + 4);
427 print_node (file, "RM size", TYPE_RM_SIZE_ENUM (node), indent + 4);
431 if (TYPE_MODULAR_P (node))
432 print_node (file, "modulus", TYPE_MODULUS (node), indent + 4);
433 else if (TYPE_HAS_ACTUAL_BOUNDS_P (node))
434 print_node (file, "actual bounds", TYPE_ACTUAL_BOUNDS (node),
436 else if (TYPE_VAX_FLOATING_POINT_P (node))
439 print_node (file, "index type", TYPE_INDEX_TYPE (node), indent + 4);
441 print_node (file, "RM size", TYPE_RM_SIZE_INT (node), indent + 4);
445 print_node (file,"actual bounds", TYPE_ACTUAL_BOUNDS (node), indent + 4);
449 if (TYPE_IS_FAT_POINTER_P (node) || TYPE_CONTAINS_TEMPLATE_P (node))
450 print_node (file, "unconstrained array",
451 TYPE_UNCONSTRAINED_ARRAY (node), indent + 4);
453 print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4);
457 case QUAL_UNION_TYPE:
458 print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4);
467 gnat_printable_name (decl, verbosity)
469 int verbosity ATTRIBUTE_UNUSED;
471 const char *coded_name = IDENTIFIER_POINTER (DECL_NAME (decl));
472 char *ada_name = (char *) ggc_alloc (strlen (coded_name) * 2 + 60);
474 __gnat_decode (coded_name, ada_name, 0);
476 return (const char *) ada_name;
479 /* Expands GNAT-specific GCC tree nodes. The only ones we support
480 here are TRANSFORM_EXPR, ALLOCATE_EXPR, USE_EXPR and NULL_EXPR. */
483 gnat_expand_expr (exp, target, tmode, modifier)
486 enum machine_mode tmode;
487 int modifier; /* Actually an enum expand_modifier. */
489 tree type = TREE_TYPE (exp);
493 /* Update EXP to be the new expression to expand. */
495 switch (TREE_CODE (exp))
498 gnat_to_code (TREE_COMPLEXITY (exp));
503 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0);
505 /* We aren't going to be doing anything with this memory, but allocate
506 it anyway. If it's variable size, make a bogus address. */
507 if (! host_integerp (TYPE_SIZE_UNIT (type), 1))
508 result = gen_rtx_MEM (BLKmode, virtual_stack_vars_rtx);
510 result = assign_temp (type, 0, TREE_ADDRESSABLE (exp), 1);
516 allocate_dynamic_stack_space
517 (expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, TYPE_MODE (sizetype),
519 NULL_RTX, tree_low_cst (TREE_OPERAND (exp, 1), 1));
522 if (target != const0_rtx)
525 /* First write a volatile ASM_INPUT to prevent anything from being
527 result = gen_rtx_ASM_INPUT (VOIDmode, "");
528 MEM_VOLATILE_P (result) = 1;
531 result = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode,
533 emit_insn (gen_rtx_USE (VOIDmode, result));
537 return expand_expr (build1 (NOP_EXPR, type, TREE_OPERAND (exp, 0)),
538 target, tmode, modifier);
540 case UNCONSTRAINED_ARRAY_REF:
541 /* If we are evaluating just for side-effects, just evaluate our
542 operand. Otherwise, abort since this code should never appear
543 in a tree to be evaluated (objects aren't unconstrained). */
544 if (target == const0_rtx || TREE_CODE (type) == VOID_TYPE)
545 return expand_expr (TREE_OPERAND (exp, 0), const0_rtx,
548 /* ... fall through ... */
554 return expand_expr (new, target, tmode, modifier);
557 /* Adjusts the RLI used to layout a record after all the fields have been
558 added. We only handle the packed case and cause it to use the alignment
559 that will pad the record at the end. */
562 gnat_adjust_rli (rli)
563 record_layout_info rli ATTRIBUTE_UNUSED;
565 /* This function has no actual effect; record_align should already
566 reflect the largest alignment desired by a field. jason 2003-04-01 */
569 /* Make a TRANSFORM_EXPR to later expand GNAT_NODE into code. */
572 make_transform_expr (gnat_node)
575 tree gnu_result = build (TRANSFORM_EXPR, void_type_node);
577 TREE_SIDE_EFFECTS (gnu_result) = 1;
578 TREE_COMPLEXITY (gnu_result) = gnat_node;
582 /* Update the setjmp buffer BUF with the current stack pointer. We assume
583 here that a __builtin_setjmp was done to BUF. */
586 update_setjmp_buf (buf)
589 enum machine_mode sa_mode = Pmode;
592 #ifdef HAVE_save_stack_nonlocal
593 if (HAVE_save_stack_nonlocal)
594 sa_mode = insn_data[(int) CODE_FOR_save_stack_nonlocal].operand[0].mode;
596 #ifdef STACK_SAVEAREA_MODE
597 sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
601 = gen_rtx_MEM (sa_mode,
604 plus_constant (expand_expr
605 (build_unary_op (ADDR_EXPR, NULL_TREE, buf),
606 NULL_RTX, VOIDmode, 0),
607 2 * GET_MODE_SIZE (Pmode))));
611 emit_insn (gen_setjmp ());
614 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
617 /* These routines are used in conjunction with GCC exception handling. */
619 /* Map compile-time to run-time tree for GCC exception handling scheme. */
622 gnat_eh_runtime_type (type)
628 /* Return true if type A catches type B. Callback for flow analysis from
629 the exception handling part of the back-end. */
632 gnat_eh_type_covers (a, b)
635 /* a catches b if they represent the same exception id or if a
638 ??? integer_zero_node for "others" is hardwired in too many places
640 return (a == b || a == integer_zero_node);
643 /* See if DECL has an RTL that is indirect via a pseudo-register or a
644 memory location and replace it with an indirect reference if so.
645 This improves the debugger's ability to display the value. */
648 adjust_decl_rtl (decl)
653 /* If this decl is already indirect, don't do anything. This should
654 mean that the decl cannot be indirect, but there's no point in
655 adding an abort to check that. */
656 if (TREE_CODE (decl) != CONST_DECL
657 && ! DECL_BY_REF_P (decl)
658 && (GET_CODE (DECL_RTL (decl)) == MEM
659 && (GET_CODE (XEXP (DECL_RTL (decl), 0)) == MEM
660 || (GET_CODE (XEXP (DECL_RTL (decl), 0)) == REG
661 && (REGNO (XEXP (DECL_RTL (decl), 0))
662 > LAST_VIRTUAL_REGISTER))))
663 /* We can't do this if the reference type's mode is not the same
664 as the current mode, which means this may not work on mixed 32/64
666 && (new_type = build_reference_type (TREE_TYPE (decl))) != 0
667 && TYPE_MODE (new_type) == GET_MODE (XEXP (DECL_RTL (decl), 0))
668 /* If this is a PARM_DECL, we can only do it if DECL_INCOMING_RTL
669 is also an indirect and of the same mode and if the object is
670 readonly, the latter condition because we don't want to upset the
671 handling of CICO_LIST. */
672 && (TREE_CODE (decl) != PARM_DECL
673 || (GET_CODE (DECL_INCOMING_RTL (decl)) == MEM
674 && (TYPE_MODE (new_type)
675 == GET_MODE (XEXP (DECL_INCOMING_RTL (decl), 0)))
676 && TREE_READONLY (decl))))
679 = build_qualified_type (new_type,
680 (TYPE_QUALS (new_type) | TYPE_QUAL_CONST));
682 DECL_POINTS_TO_READONLY_P (decl) = TREE_READONLY (decl);
683 DECL_BY_REF_P (decl) = 1;
684 SET_DECL_RTL (decl, XEXP (DECL_RTL (decl), 0));
685 TREE_TYPE (decl) = new_type;
686 DECL_MODE (decl) = TYPE_MODE (new_type);
687 DECL_ALIGN (decl) = TYPE_ALIGN (new_type);
688 DECL_SIZE (decl) = TYPE_SIZE (new_type);
690 if (TREE_CODE (decl) == PARM_DECL)
691 DECL_INCOMING_RTL (decl) = XEXP (DECL_INCOMING_RTL (decl), 0);
693 /* If DECL_INITIAL was set, it should be updated to show that
694 the decl is initialized to the address of that thing.
695 Otherwise, just set it to the address of this decl.
696 It needs to be set so that GCC does not think the decl is
699 = build1 (ADDR_EXPR, new_type,
700 DECL_INITIAL (decl) != 0 ? DECL_INITIAL (decl) : decl);
704 /* Record the current code position in GNAT_NODE. */
707 record_code_position (gnat_node)
710 if (global_bindings_p ())
712 /* Make a dummy entry so multiple things at the same location don't
713 end up in the same place. */
714 add_pending_elaborations (NULL_TREE, NULL_TREE);
715 save_gnu_tree (gnat_node, get_elaboration_location (), 1);
718 /* Always emit another insn in case marking the last insn
719 addressable needs some fixups and also for above reason. */
720 save_gnu_tree (gnat_node,
721 build (RTL_EXPR, void_type_node, NULL_TREE,
722 (tree) emit_note (0, NOTE_INSN_DELETED)),
726 /* Insert the code for GNAT_NODE at the position saved for that node. */
729 insert_code_for (gnat_node)
732 if (global_bindings_p ())
734 push_pending_elaborations ();
735 gnat_to_code (gnat_node);
736 Check_Elaboration_Code_Allowed (gnat_node);
737 insert_elaboration_list (get_gnu_tree (gnat_node));
738 pop_pending_elaborations ();
744 do_pending_stack_adjust ();
746 mark_all_temps_used ();
747 gnat_to_code (gnat_node);
748 do_pending_stack_adjust ();
749 insns = get_insns ();
751 emit_insn_after (insns, RTL_EXPR_RTL (get_gnu_tree (gnat_node)));
755 /* Get the alias set corresponding to a type or expression. */
758 gnat_get_alias_set (type)
761 /* If this is a padding type, use the type of the first field. */
762 if (TREE_CODE (type) == RECORD_TYPE
763 && TYPE_IS_PADDING_P (type))
764 return get_alias_set (TREE_TYPE (TYPE_FIELDS (type)));
766 /* If the type is an unconstrained array, use the type of the
767 self-referential array we make. */
768 else if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)
770 get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))));
776 /* GNU_TYPE is a type. Determine if it should be passed by reference by
780 default_pass_by_ref (gnu_type)
785 INIT_CUMULATIVE_ARGS (cum, NULL_TREE, NULL_RTX, 0);
787 /* We pass aggregates by reference if they are sufficiently large. The
788 choice of constant here is somewhat arbitrary. We also pass by
789 reference if the target machine would either pass or return by
790 reference. Strictly speaking, we need only check the return if this
791 is an In Out parameter, but it's probably best to err on the side of
792 passing more things by reference. */
794 #ifdef FUNCTION_ARG_PASS_BY_REFERENCE
795 || FUNCTION_ARG_PASS_BY_REFERENCE (cum, TYPE_MODE (gnu_type),
798 || RETURN_IN_MEMORY (gnu_type)
799 || (AGGREGATE_TYPE_P (gnu_type)
800 && (! host_integerp (TYPE_SIZE (gnu_type), 1)
801 || 0 < compare_tree_int (TYPE_SIZE (gnu_type),
802 8 * TYPE_ALIGN (gnu_type)))));
805 /* GNU_TYPE is the type of a subprogram parameter. Determine from the type if
806 it should be passed by reference. */
809 must_pass_by_ref (gnu_type)
812 /* We pass only unconstrained objects, those required by the language
813 to be passed by reference, and objects of variable size. The latter
814 is more efficient, avoids problems with variable size temporaries,
815 and does not produce compatibility problems with C, since C does
816 not have such objects. */
817 return (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE
818 || (AGGREGATE_TYPE_P (gnu_type) && TYPE_BY_REFERENCE_P (gnu_type))
819 || (TYPE_SIZE (gnu_type) != 0
820 && TREE_CODE (TYPE_SIZE (gnu_type)) != INTEGER_CST));
823 /* This function returns the version of GCC being used. Here it's GCC 3. */