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 "toplev.h"
  29 #include "diagnostic.h"
  30 #include "output.h"
  31 #include "flags.h"
  32 #include "ggc.h"
  33 #include "rtl.h"
  34 #include "expr.h"
  35 #include "c-tree.h"
  36 #include "c-lex.h"
  37
  38 static int c_tree_printer PARAMS ((output_buffer *));
  39
  40 #if USE_CPPLIB
  41 #include "cpplib.h"
  42 extern cpp_reader  parse_in;
  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_init ();
  61   cpp_reader_init (&parse_in);
  62 #endif
  63   /* Mark as "unspecified".  */
  64   flag_bounds_check = -1;
  65 }
  66
  67 void
  68 lang_init ()
  69 {
  70   /* If still "unspecified", make it match -fbounded-pointers.  */
  71   if (flag_bounds_check < 0)
  72     flag_bounds_check = flag_bounded_pointers;
  73
  74   /* If still unspecified, make it match pedantic && -std=c99.  */
  75   if (mesg_implicit_function_declaration < 0)
  76     {
  77       if (pedantic && flag_isoc99)
  78         mesg_implicit_function_declaration = flag_pedantic_errors ? 2 : 1;
  79       else
  80         mesg_implicit_function_declaration = 0;
  81     }
  82
  83   /* the beginning of the file is a new line; check for # */
  84   /* With luck, we discover the real source file's name from that
  85      and put it in input_filename.  */
  86 #if !USE_CPPLIB
  87   ungetc (check_newline (), finput);
  88 #endif
  89
  90   save_lang_status = &push_c_function_context;
  91   restore_lang_status = &pop_c_function_context;
  92   mark_lang_status = &mark_c_function_context;
  93   lang_expand_expr = &c_expand_expr;
  94   lang_safe_from_p = &c_safe_from_p;
  95   lang_printer = &c_tree_printer;
  96   lang_expand_decl_stmt = &c_expand_decl_stmt;
  97
  98   c_parse_init ();
  99 }
 100
 101 void
 102 lang_finish ()
 103 {
 104 }
 105
 106 const char *
 107 lang_identify ()
 108 {
 109   return "c";
 110 }
 111
 112 void
 113 print_lang_statistics ()
 114 {
 115 }
 116
 117 /* used by print-tree.c */
 118
 119 void
 120 lang_print_xnode (file, node, indent)
 121      FILE *file ATTRIBUTE_UNUSED;
 122      tree node ATTRIBUTE_UNUSED;
 123      int indent ATTRIBUTE_UNUSED;
 124 {
 125 }
 126
 127 /* Used by c-lex.c, but only for objc.  */
 128
 129 tree
 130 lookup_interface (arg)
 131      tree arg ATTRIBUTE_UNUSED;
 132 {
 133   return 0;
 134 }
 135
 136 tree
 137 is_class_name (arg)
 138     tree arg ATTRIBUTE_UNUSED;
 139 {
 140   return 0;
 141 }
 142
 143 void
 144 maybe_objc_check_decl (decl)
 145      tree decl ATTRIBUTE_UNUSED;
 146 {
 147 }
 148
 149 int
 150 maybe_objc_comptypes (lhs, rhs, reflexive)
 151      tree lhs ATTRIBUTE_UNUSED;
 152      tree rhs ATTRIBUTE_UNUSED;
 153      int reflexive ATTRIBUTE_UNUSED;
 154 {
 155   return -1;
 156 }
 157
 158 tree
 159 maybe_objc_method_name (decl)
 160     tree decl ATTRIBUTE_UNUSED;
 161 {
 162   return 0;
 163 }
 164
 165 tree
 166 maybe_building_objc_message_expr ()
 167 {
 168   return 0;
 169 }
 170
 171 int
 172 recognize_objc_keyword ()
 173 {
 174   return 0;
 175 }
 176
 177 /* Used by c-typeck.c (build_external_ref), but only for objc.  */
 178
 179 tree
 180 lookup_objc_ivar (id)
 181      tree id ATTRIBUTE_UNUSED;
 182 {
 183   return 0;
 184 }
 185
 186 #if !defined(ASM_OUTPUT_CONSTRUCTOR) || !defined(ASM_OUTPUT_DESTRUCTOR)
 187 extern tree static_ctors;
 188 extern tree static_dtors;
 189
 190 static tree start_cdtor         PARAMS ((int));
 191 static void finish_cdtor        PARAMS ((tree));
 192
 193 static tree
 194 start_cdtor (method_type)
 195      int method_type;
 196 {
 197   tree fnname = get_file_function_name (method_type);
 198   tree void_list_node_1 = build_tree_list (NULL_TREE, void_type_node);
 199   tree body;
 200
 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   store_parm_decls ();
 208
 209   current_function_cannot_inline
 210     = "static constructors and destructors cannot be inlined";
 211
 212   body = c_begin_compound_stmt ();
 213
 214   pushlevel (0);
 215   clear_last_expr ();
 216   add_scope_stmt (/*begin_p=*/1, /*partial_p=*/0);
 217
 218   return body;
 219 }
 220
 221 static void
 222 finish_cdtor (body)
 223      tree body;
 224 {
 225   tree scope;
 226   tree block;
 227
 228   scope = add_scope_stmt (/*begin_p=*/0, /*partial_p=*/0);
 229   block = poplevel (0, 0, 0);
 230   SCOPE_STMT_BLOCK (TREE_PURPOSE (scope)) = block;
 231   SCOPE_STMT_BLOCK (TREE_VALUE (scope)) = block;
 232
 233   RECHAIN_STMTS (body, COMPOUND_BODY (body));
 234
 235   finish_function (0);
 236 }
 237 #endif
 238
 239 /* Called at end of parsing, but before end-of-file processing.  */
 240
 241 void
 242 finish_file ()
 243 {
 244 #ifndef ASM_OUTPUT_CONSTRUCTOR
 245   if (static_ctors)
 246     {
 247       tree body = start_cdtor ('I');
 248
 249       for (; static_ctors; static_ctors = TREE_CHAIN (static_ctors))
 250         c_expand_expr_stmt (build_function_call (TREE_VALUE (static_ctors),
 251                                                  NULL_TREE));
 252
 253       finish_cdtor (body);
 254     }
 255 #endif
 256 #ifndef ASM_OUTPUT_DESTRUCTOR
 257   if (static_dtors)
 258     {
 259       tree body = start_cdtor ('D');
 260
 261       for (; static_dtors; static_dtors = TREE_CHAIN (static_dtors))
 262         c_expand_expr_stmt (build_function_call (TREE_VALUE (static_dtors),
 263                                                  NULL_TREE));
 264
 265       finish_cdtor (body);
 266     }
 267 #endif
 268
 269   if (back_end_hook)
 270     (*back_end_hook) (getdecls ());
 271 }
 272
 273 /* Called during diagnostic message formatting process to print a
 274    source-level entity onto BUFFER.  The meaning of the format specifiers
 275    is as follows:
 276    %D: a general decl,
 277    %F: a function declaration,
 278    %T: a type.
 279
 280    These format specifiers form a subset of the format specifiers set used
 281    by the C++ front-end.
 282    Please notice when called, the `%' part was already skipped by the
 283    diagnostic machinery.  */
 284 static int
 285 c_tree_printer (buffer)
 286      output_buffer *buffer;
 287 {
 288   tree t = va_arg (output_buffer_format_args (buffer), tree);
 289
 290   switch (*output_buffer_text_cursor (buffer))
 291     {
 292     case 'D':
 293     case 'F':
 294     case 'T':
 295       {
 296         const char *n = DECL_NAME (t)
 297           ? (*decl_printable_name) (t, 2)
 298           : "({anonymous})";
 299         output_add_string (buffer, n);
 300       }
 301       return 1;
 302
 303     default:
 304       return 0;
 305     }
 306 }