gcc/c-lang.c

   1 /* Language-specific hook definitions for C front end.
   2    Copyright (C) 1991, 1995, 1997, 1998,
   3    1999, 2000, 2001 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 #include "cpplib.h"
  38
  39 static int c_tree_printer PARAMS ((output_buffer *));
  40 static int c_missing_noreturn_ok_p PARAMS ((tree));
  41
  42 /* Each of the functions defined here
  43    is an alternative to a function in objc-actions.c.  */
  44
  45 int
  46 lang_decode_option (argc, argv)
  47      int argc;
  48      char **argv;
  49 {
  50   return c_decode_option (argc, argv);
  51 }
  52
  53 void
  54 lang_init_options ()
  55 {
  56   parse_in = cpp_create_reader (CLK_GNUC89);
  57
  58   /* Mark as "unspecified".  */
  59   flag_bounds_check = -1;
  60 }
  61
  62 void
  63 lang_init ()
  64 {
  65   c_common_lang_init ();
  66
  67   /* If still unspecified, make it match pedantic && -std=c99.  */
  68   if (mesg_implicit_function_declaration < 0)
  69     {
  70       if (pedantic && flag_isoc99)
  71         mesg_implicit_function_declaration = flag_pedantic_errors ? 2 : 1;
  72       else
  73         mesg_implicit_function_declaration = 0;
  74     }
  75
  76   save_lang_status = &push_c_function_context;
  77   restore_lang_status = &pop_c_function_context;
  78   mark_lang_status = &mark_c_function_context;
  79   lang_expand_expr = &c_expand_expr;
  80   lang_safe_from_p = &c_safe_from_p;
  81   lang_printer = &c_tree_printer;
  82   lang_expand_decl_stmt = &c_expand_decl_stmt;
  83   lang_missing_noreturn_ok_p = &c_missing_noreturn_ok_p;
  84
  85   c_parse_init ();
  86 }
  87
  88 void
  89 lang_finish ()
  90 {
  91 }
  92
  93 const char *
  94 lang_identify ()
  95 {
  96   return "c";
  97 }
  98
  99 void
 100 print_lang_statistics ()
 101 {
 102 }
 103
 104 /* used by print-tree.c */
 105
 106 void
 107 lang_print_xnode (file, node, indent)
 108      FILE *file ATTRIBUTE_UNUSED;
 109      tree node ATTRIBUTE_UNUSED;
 110      int indent ATTRIBUTE_UNUSED;
 111 {
 112 }
 113
 114 /* Used by c-lex.c, but only for objc.  */
 115
 116 tree
 117 lookup_interface (arg)
 118      tree arg ATTRIBUTE_UNUSED;
 119 {
 120   return 0;
 121 }
 122
 123 tree
 124 is_class_name (arg)
 125     tree arg ATTRIBUTE_UNUSED;
 126 {
 127   return 0;
 128 }
 129
 130 void
 131 maybe_objc_check_decl (decl)
 132      tree decl ATTRIBUTE_UNUSED;
 133 {
 134 }
 135
 136 int
 137 maybe_objc_comptypes (lhs, rhs, reflexive)
 138      tree lhs ATTRIBUTE_UNUSED;
 139      tree rhs ATTRIBUTE_UNUSED;
 140      int reflexive ATTRIBUTE_UNUSED;
 141 {
 142   return -1;
 143 }
 144
 145 tree
 146 maybe_objc_method_name (decl)
 147     tree decl ATTRIBUTE_UNUSED;
 148 {
 149   return 0;
 150 }
 151
 152 tree
 153 maybe_building_objc_message_expr ()
 154 {
 155   return 0;
 156 }
 157
 158 int
 159 recognize_objc_keyword ()
 160 {
 161   return 0;
 162 }
 163
 164 /* Used by c-typeck.c (build_external_ref), but only for objc.  */
 165
 166 tree
 167 lookup_objc_ivar (id)
 168      tree id ATTRIBUTE_UNUSED;
 169 {
 170   return 0;
 171 }
 172
 173 #if !defined(ASM_OUTPUT_CONSTRUCTOR) || !defined(ASM_OUTPUT_DESTRUCTOR)
 174 extern tree static_ctors;
 175 extern tree static_dtors;
 176
 177 static tree start_cdtor         PARAMS ((int));
 178 static void finish_cdtor        PARAMS ((tree));
 179
 180 static tree
 181 start_cdtor (method_type)
 182      int method_type;
 183 {
 184   tree fnname = get_file_function_name (method_type);
 185   tree void_list_node_1 = build_tree_list (NULL_TREE, void_type_node);
 186   tree body;
 187
 188   start_function (void_list_node_1,
 189                   build_parse_node (CALL_EXPR, fnname,
 190                                     tree_cons (NULL_TREE, NULL_TREE,
 191                                                void_list_node_1),
 192                                     NULL_TREE),
 193                   NULL_TREE, NULL_TREE);
 194   store_parm_decls ();
 195
 196   current_function_cannot_inline
 197     = "static constructors and destructors cannot be inlined";
 198
 199   body = c_begin_compound_stmt ();
 200
 201   pushlevel (0);
 202   clear_last_expr ();
 203   add_scope_stmt (/*begin_p=*/1, /*partial_p=*/0);
 204
 205   return body;
 206 }
 207
 208 static void
 209 finish_cdtor (body)
 210      tree body;
 211 {
 212   tree scope;
 213   tree block;
 214
 215   scope = add_scope_stmt (/*begin_p=*/0, /*partial_p=*/0);
 216   block = poplevel (0, 0, 0);
 217   SCOPE_STMT_BLOCK (TREE_PURPOSE (scope)) = block;
 218   SCOPE_STMT_BLOCK (TREE_VALUE (scope)) = block;
 219
 220   RECHAIN_STMTS (body, COMPOUND_BODY (body));
 221
 222   finish_function (0);
 223 }
 224 #endif
 225
 226 /* Called at end of parsing, but before end-of-file processing.  */
 227
 228 void
 229 finish_file ()
 230 {
 231 #ifndef ASM_OUTPUT_CONSTRUCTOR
 232   if (static_ctors)
 233     {
 234       tree body = start_cdtor ('I');
 235
 236       for (; static_ctors; static_ctors = TREE_CHAIN (static_ctors))
 237         c_expand_expr_stmt (build_function_call (TREE_VALUE (static_ctors),
 238                                                  NULL_TREE));
 239
 240       finish_cdtor (body);
 241     }
 242 #endif
 243 #ifndef ASM_OUTPUT_DESTRUCTOR
 244   if (static_dtors)
 245     {
 246       tree body = start_cdtor ('D');
 247
 248       for (; static_dtors; static_dtors = TREE_CHAIN (static_dtors))
 249         c_expand_expr_stmt (build_function_call (TREE_VALUE (static_dtors),
 250                                                  NULL_TREE));
 251
 252       finish_cdtor (body);
 253     }
 254 #endif
 255
 256   if (back_end_hook)
 257     (*back_end_hook) (getdecls ());
 258
 259   if (flag_dump_translation_unit)
 260     dump_node_to_file (getdecls (), flag_dump_translation_unit);
 261 }
 262
 263 /* Called during diagnostic message formatting process to print a
 264    source-level entity onto BUFFER.  The meaning of the format specifiers
 265    is as follows:
 266    %D: a general decl,
 267    %F: a function declaration,
 268    %T: a type.
 269
 270    These format specifiers form a subset of the format specifiers set used
 271    by the C++ front-end.
 272    Please notice when called, the `%' part was already skipped by the
 273    diagnostic machinery.  */
 274 static int
 275 c_tree_printer (buffer)
 276      output_buffer *buffer;
 277 {
 278   tree t = va_arg (output_buffer_format_args (buffer), tree);
 279
 280   switch (*output_buffer_text_cursor (buffer))
 281     {
 282     case 'D':
 283     case 'F':
 284     case 'T':
 285       {
 286         const char *n = DECL_NAME (t)
 287           ? (*decl_printable_name) (t, 2)
 288           : "({anonymous})";
 289         output_add_string (buffer, n);
 290       }
 291       return 1;
 292
 293     default:
 294       return 0;
 295     }
 296 }
 297
 298 static int
 299 c_missing_noreturn_ok_p (decl)
 300      tree decl;
 301 {
 302   /* A missing noreturn is not ok for freestanding implementations and
 303      ok for the `main' function in hosted implementations.  */
 304   return flag_hosted && MAIN_NAME_P (DECL_ASSEMBLER_NAME (decl));
 305 }