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 char *yy_cur;
  41 extern cpp_reader  parse_in;
  42 extern cpp_options parse_options;
  43 #endif
  44
  45 /* Each of the functions defined here
  46    is an alternative to a function in objc-actions.c.  */
  47
  48 int
  49 lang_decode_option (argc, argv)
  50      int argc;
  51      char **argv;
  52 {
  53   return c_decode_option (argc, argv);
  54 }
  55
  56 void
  57 lang_init_options ()
  58 {
  59 #if USE_CPPLIB
  60   cpp_reader_init (&parse_in);
  61   parse_in.opts = &parse_options;
  62   cpp_options_init (&parse_options);
  63 #endif
  64   /* Mark as "unspecified".  */
  65   flag_bounds_check = -1;
  66 }
  67
  68 void
  69 lang_init ()
  70 {
  71   /* If still "unspecified", make it match -fbounded-pointers.  */
  72   if (flag_bounds_check < 0)
  73     flag_bounds_check = flag_bounded_pointers;
  74
  75   /* If still unspecified, make it match pedantic && -std=c99.  */
  76   if (mesg_implicit_function_declaration < 0)
  77     {
  78       if (pedantic && flag_isoc99)
  79         mesg_implicit_function_declaration = flag_pedantic_errors ? 2 : 1;
  80       else
  81         mesg_implicit_function_declaration = 0;
  82     }
  83
  84   /* the beginning of the file is a new line; check for # */
  85   /* With luck, we discover the real source file's name from that
  86      and put it in input_filename.  */
  87 #if !USE_CPPLIB
  88   ungetc (check_newline (), finput);
  89 #else
  90   check_newline ();
  91   yy_cur--;
  92 #endif
  93
  94   save_lang_status = &push_c_function_context;
  95   restore_lang_status = &pop_c_function_context;
  96   mark_lang_status = &mark_c_function_context;
  97
  98   lang_printer = c_tree_printer;
  99
 100   c_parse_init ();
 101 }
 102
 103 void
 104 lang_finish ()
 105 {
 106 }
 107
 108 const char *
 109 lang_identify ()
 110 {
 111   return "c";
 112 }
 113
 114 void
 115 print_lang_statistics ()
 116 {
 117 }
 118
 119 /* used by print-tree.c */
 120
 121 void
 122 lang_print_xnode (file, node, indent)
 123      FILE *file ATTRIBUTE_UNUSED;
 124      tree node ATTRIBUTE_UNUSED;
 125      int indent ATTRIBUTE_UNUSED;
 126 {
 127 }
 128
 129 /* Used by c-lex.c, but only for objc.  */
 130
 131 tree
 132 lookup_interface (arg)
 133      tree arg ATTRIBUTE_UNUSED;
 134 {
 135   return 0;
 136 }
 137
 138 tree
 139 is_class_name (arg)
 140     tree arg ATTRIBUTE_UNUSED;
 141 {
 142   return 0;
 143 }
 144
 145 void
 146 maybe_objc_check_decl (decl)
 147      tree decl ATTRIBUTE_UNUSED;
 148 {
 149 }
 150
 151 int
 152 maybe_objc_comptypes (lhs, rhs, reflexive)
 153      tree lhs ATTRIBUTE_UNUSED;
 154      tree rhs ATTRIBUTE_UNUSED;
 155      int reflexive ATTRIBUTE_UNUSED;
 156 {
 157   return -1;
 158 }
 159
 160 tree
 161 maybe_objc_method_name (decl)
 162     tree decl ATTRIBUTE_UNUSED;
 163 {
 164   return 0;
 165 }
 166
 167 tree
 168 maybe_building_objc_message_expr ()
 169 {
 170   return 0;
 171 }
 172
 173 int
 174 recognize_objc_keyword ()
 175 {
 176   return 0;
 177 }
 178
 179 /* Used by c-typeck.c (build_external_ref), but only for objc.  */
 180
 181 tree
 182 lookup_objc_ivar (id)
 183      tree id ATTRIBUTE_UNUSED;
 184 {
 185   return 0;
 186 }
 187
 188 /* Called at end of parsing, but before end-of-file processing.  */
 189
 190 void
 191 finish_file ()
 192 {
 193 #ifndef ASM_OUTPUT_CONSTRUCTOR
 194   extern tree static_ctors;
 195 #endif
 196 #ifndef ASM_OUTPUT_DESTRUCTOR
 197   extern tree static_dtors;
 198 #endif
 199   extern tree build_function_call                 PARAMS ((tree, tree));
 200 #if !defined(ASM_OUTPUT_CONSTRUCTOR) || !defined(ASM_OUTPUT_DESTRUCTOR)
 201   tree void_list_node_1 = build_tree_list (NULL_TREE, void_type_node);
 202 #endif
 203 #ifndef ASM_OUTPUT_CONSTRUCTOR
 204   if (static_ctors)
 205     {
 206       tree fnname = get_file_function_name ('I');
 207       start_function (void_list_node_1,
 208                       build_parse_node (CALL_EXPR, fnname,
 209                                         tree_cons (NULL_TREE, NULL_TREE,
 210                                                    void_list_node_1),
 211                                         NULL_TREE),
 212                       NULL_TREE, NULL_TREE);
 213       fnname = DECL_ASSEMBLER_NAME (current_function_decl);
 214       store_parm_decls ();
 215
 216       for (; static_ctors; static_ctors = TREE_CHAIN (static_ctors))
 217         expand_expr_stmt (build_function_call (TREE_VALUE (static_ctors),
 218                                                NULL_TREE));
 219
 220       finish_function (0);
 221
 222       assemble_constructor (IDENTIFIER_POINTER (fnname));
 223     }
 224 #endif
 225 #ifndef ASM_OUTPUT_DESTRUCTOR
 226   if (static_dtors)
 227     {
 228       tree fnname = get_file_function_name ('D');
 229       start_function (void_list_node_1,
 230                       build_parse_node (CALL_EXPR, fnname,
 231                                         tree_cons (NULL_TREE, NULL_TREE,
 232                                                    void_list_node_1),
 233                                         NULL_TREE),
 234                       NULL_TREE, NULL_TREE);
 235       fnname = DECL_ASSEMBLER_NAME (current_function_decl);
 236       store_parm_decls ();
 237
 238       for (; static_dtors; static_dtors = TREE_CHAIN (static_dtors))
 239         expand_expr_stmt (build_function_call (TREE_VALUE (static_dtors),
 240                                                NULL_TREE));
 241
 242       finish_function (0);
 243
 244       assemble_destructor (IDENTIFIER_POINTER (fnname));
 245     }
 246 #endif
 247 }
 248
 249 /* Called during diagnostic message formatting process to print a
 250    source-level entity onto BUFFER.  The meaning of the format specifiers
 251    is as follows:
 252    %D: a general decl,
 253    %F: a function declaration,
 254    %T: a type.
 255
 256    These format specifiers form a subset of the format specifiers set used
 257    by the C++ front-end.
 258    Please notice when called, the `%' part was already skipped by the
 259    diagnostic machinery.  */
 260 static int
 261 c_tree_printer (buffer)
 262      output_buffer *buffer;
 263 {
 264   tree t = va_arg (output_buffer_format_args (buffer), tree);
 265
 266   switch (*output_buffer_text_cursor (buffer))
 267     {
 268     case 'D':
 269     case 'F':
 270     case 'T':
 271       {
 272         const char *n = DECL_NAME (t)
 273           ? (*decl_printable_name) (t, 2)
 274           : "({anonymous})";
 275         output_add_string (buffer, n);
 276       }
 277       return 1;
 278
 279     default:
 280       return 0;
 281     }
 282 }