gcc/c-lang.c

   1 /* Language-specific hook definitions for C front end.
   2    Copyright (C) 1991, 1995, 1997, 1998,
   3    1999, 2000 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22
  23 #include "config.h"
  24 #include "system.h"
  25 #include "tree.h"
  26 #include "function.h"
  27 #include "input.h"
  28 #include "c-tree.h"
  29 #include "c-lex.h"
  30 #include "toplev.h"
  31 #include "diagnostic.h"
  32 #include "output.h"
  33 #include "flags.h"
  34 #include "ggc.h"
  35
  36 static int c_tree_printer PARAMS ((output_buffer *));
  37
  38 #if USE_CPPLIB
  39 #include "cpplib.h"
  40 extern cpp_reader  parse_in;
  41 #endif
  42
  43 /* Each of the functions defined here
  44    is an alternative to a function in objc-actions.c.  */
  45
  46 int
  47 lang_decode_option (argc, argv)
  48      int argc;
  49      char **argv;
  50 {
  51   return c_decode_option (argc, argv);
  52 }
  53
  54 void
  55 lang_init_options ()
  56 {
  57 #if USE_CPPLIB
  58   cpp_init ();
  59   cpp_reader_init (&parse_in);
  60 #endif
  61   /* Mark as "unspecified".  */
  62   flag_bounds_check = -1;
  63 }
  64
  65 void
  66 lang_init ()
  67 {
  68   /* If still "unspecified", make it match -fbounded-pointers.  */
  69   if (flag_bounds_check < 0)
  70     flag_bounds_check = flag_bounded_pointers;
  71
  72   /* If still unspecified, make it match pedantic && -std=c99.  */
  73   if (mesg_implicit_function_declaration < 0)
  74     {
  75       if (pedantic && flag_isoc99)
  76         mesg_implicit_function_declaration = flag_pedantic_errors ? 2 : 1;
  77       else
  78         mesg_implicit_function_declaration = 0;
  79     }
  80
  81   /* the beginning of the file is a new line; check for # */
  82   /* With luck, we discover the real source file's name from that
  83      and put it in input_filename.  */
  84 #if !USE_CPPLIB
  85   ungetc (check_newline (), finput);
  86 #endif
  87
  88   save_lang_status = &push_c_function_context;
  89   restore_lang_status = &pop_c_function_context;
  90   mark_lang_status = &mark_c_function_context;
  91
  92   lang_printer = c_tree_printer;
  93
  94   c_parse_init ();
  95 }
  96
  97 void
  98 lang_finish ()
  99 {
 100 }
 101
 102 const char *
 103 lang_identify ()
 104 {
 105   return "c";
 106 }
 107
 108 void
 109 print_lang_statistics ()
 110 {
 111 }
 112
 113 /* used by print-tree.c */
 114
 115 void
 116 lang_print_xnode (file, node, indent)
 117      FILE *file ATTRIBUTE_UNUSED;
 118      tree node ATTRIBUTE_UNUSED;
 119      int indent ATTRIBUTE_UNUSED;
 120 {
 121 }
 122
 123 /* Used by c-lex.c, but only for objc.  */
 124
 125 tree
 126 lookup_interface (arg)
 127      tree arg ATTRIBUTE_UNUSED;
 128 {
 129   return 0;
 130 }
 131
 132 tree
 133 is_class_name (arg)
 134     tree arg ATTRIBUTE_UNUSED;
 135 {
 136   return 0;
 137 }
 138
 139 void
 140 maybe_objc_check_decl (decl)
 141      tree decl ATTRIBUTE_UNUSED;
 142 {
 143 }
 144
 145 int
 146 maybe_objc_comptypes (lhs, rhs, reflexive)
 147      tree lhs ATTRIBUTE_UNUSED;
 148      tree rhs ATTRIBUTE_UNUSED;
 149      int reflexive ATTRIBUTE_UNUSED;
 150 {
 151   return -1;
 152 }
 153
 154 tree
 155 maybe_objc_method_name (decl)
 156     tree decl ATTRIBUTE_UNUSED;
 157 {
 158   return 0;
 159 }
 160
 161 tree
 162 maybe_building_objc_message_expr ()
 163 {
 164   return 0;
 165 }
 166
 167 int
 168 recognize_objc_keyword ()
 169 {
 170   return 0;
 171 }
 172
 173 /* Used by c-typeck.c (build_external_ref), but only for objc.  */
 174
 175 tree
 176 lookup_objc_ivar (id)
 177      tree id ATTRIBUTE_UNUSED;
 178 {
 179   return 0;
 180 }
 181
 182 /* Called at end of parsing, but before end-of-file processing.  */
 183
 184 void
 185 finish_file ()
 186 {
 187 #ifndef ASM_OUTPUT_CONSTRUCTOR
 188   extern tree static_ctors;
 189 #endif
 190 #ifndef ASM_OUTPUT_DESTRUCTOR
 191   extern tree static_dtors;
 192 #endif
 193   extern tree build_function_call                 PARAMS ((tree, tree));
 194 #if !defined(ASM_OUTPUT_CONSTRUCTOR) || !defined(ASM_OUTPUT_DESTRUCTOR)
 195   tree void_list_node_1 = build_tree_list (NULL_TREE, void_type_node);
 196 #endif
 197 #ifndef ASM_OUTPUT_CONSTRUCTOR
 198   if (static_ctors)
 199     {
 200       tree fnname = get_file_function_name ('I');
 201       start_function (void_list_node_1,
 202                       build_parse_node (CALL_EXPR, fnname,
 203                                         tree_cons (NULL_TREE, NULL_TREE,
 204                                                    void_list_node_1),
 205                                         NULL_TREE),
 206                       NULL_TREE, NULL_TREE);
 207       fnname = DECL_ASSEMBLER_NAME (current_function_decl);
 208       store_parm_decls ();
 209
 210       for (; static_ctors; static_ctors = TREE_CHAIN (static_ctors))
 211         expand_expr_stmt (build_function_call (TREE_VALUE (static_ctors),
 212                                                NULL_TREE));
 213
 214       finish_function (0);
 215
 216       assemble_constructor (IDENTIFIER_POINTER (fnname));
 217     }
 218 #endif
 219 #ifndef ASM_OUTPUT_DESTRUCTOR
 220   if (static_dtors)
 221     {
 222       tree fnname = get_file_function_name ('D');
 223       start_function (void_list_node_1,
 224                       build_parse_node (CALL_EXPR, fnname,
 225                                         tree_cons (NULL_TREE, NULL_TREE,
 226                                                    void_list_node_1),
 227                                         NULL_TREE),
 228                       NULL_TREE, NULL_TREE);
 229       fnname = DECL_ASSEMBLER_NAME (current_function_decl);
 230       store_parm_decls ();
 231
 232       for (; static_dtors; static_dtors = TREE_CHAIN (static_dtors))
 233         expand_expr_stmt (build_function_call (TREE_VALUE (static_dtors),
 234                                                NULL_TREE));
 235
 236       finish_function (0);
 237
 238       assemble_destructor (IDENTIFIER_POINTER (fnname));
 239     }
 240 #endif
 241 }
 242
 243 /* Called during diagnostic message formatting process to print a
 244    source-level entity onto BUFFER.  The meaning of the format specifiers
 245    is as follows:
 246    %D: a general decl,
 247    %F: a function declaration,
 248    %T: a type.
 249
 250    These format specifiers form a subset of the format specifiers set used
 251    by the C++ front-end.
 252    Please notice when called, the `%' part was already skipped by the
 253    diagnostic machinery.  */
 254 static int
 255 c_tree_printer (buffer)
 256      output_buffer *buffer;
 257 {
 258   tree t = va_arg (output_buffer_format_args (buffer), tree);
 259
 260   switch (*output_buffer_text_cursor (buffer))
 261     {
 262     case 'D':
 263     case 'F':
 264     case 'T':
 265       {
 266         const char *n = DECL_NAME (t)
 267           ? (*decl_printable_name) (t, 2)
 268           : "({anonymous})";
 269         output_add_string (buffer, n);
 270       }
 271       return 1;
 272
 273     default:
 274       return 0;
 275     }
 276 }