contrib/gcc-3.4/gcc/c-objc-common.c

   1 /* Some code common to C and ObjC front ends.
   2    Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 2, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING.  If not, write to the Free
  18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  19 02111-1307, USA.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "tm.h"
  25 #include "tree.h"
  26 #include "rtl.h"
  27 #include "insn-config.h"
  28 #include "integrate.h"
  29 #include "expr.h"
  30 #include "c-tree.h"
  31 #include "function.h"
  32 #include "flags.h"
  33 #include "toplev.h"
  34 #include "diagnostic.h"
  35 #include "tree-inline.h"
  36 #include "varray.h"
  37 #include "ggc.h"
  38 #include "langhooks.h"
  39 #include "target.h"
  40 #include "cgraph.h"
  41
  42 static bool c_tree_printer (pretty_printer *, text_info *);
  43 static tree start_cdtor (int);
  44 static void finish_cdtor (tree);
  45
  46 int
  47 c_missing_noreturn_ok_p (tree decl)
  48 {
  49   /* A missing noreturn is not ok for freestanding implementations and
  50      ok for the `main' function in hosted implementations.  */
  51   return flag_hosted && MAIN_NAME_P (DECL_ASSEMBLER_NAME (decl));
  52 }
  53
  54 /* We want to inline `extern inline' functions even if this would
  55    violate inlining limits.  Some glibc and linux constructs depend on
  56    such functions always being inlined when optimizing.  */
  57
  58 int
  59 c_disregard_inline_limits (tree fn)
  60 {
  61   if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) != NULL)
  62     return 1;
  63
  64   return (!flag_really_no_inline && DECL_DECLARED_INLINE_P (fn)
  65           && DECL_EXTERNAL (fn));
  66 }
  67
  68 int
  69 c_cannot_inline_tree_fn (tree *fnp)
  70 {
  71   tree fn = *fnp;
  72   tree t;
  73   bool do_warning = (warn_inline
  74                      && DECL_INLINE (fn)
  75                      && DECL_DECLARED_INLINE_P (fn)
  76                      && !DECL_IN_SYSTEM_HEADER (fn));
  77
  78   if (flag_really_no_inline
  79       && lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) == NULL)
  80     {
  81       if (do_warning)
  82         warning ("%Jfunction '%F' can never be inlined because it "
  83                  "is suppressed using -fno-inline", fn, fn);
  84       goto cannot_inline;
  85     }
  86
  87   /* Don't auto-inline anything that might not be bound within
  88      this unit of translation.  */
  89   if (!DECL_DECLARED_INLINE_P (fn) && !(*targetm.binds_local_p) (fn))
  90     {
  91       if (do_warning)
  92         warning ("%Jfunction '%F' can never be inlined because it might not "
  93                  "be bound within this unit of translation", fn, fn);
  94       goto cannot_inline;
  95     }
  96
  97   if (! function_attribute_inlinable_p (fn))
  98     {
  99       if (do_warning)
 100         warning ("%Jfunction '%F' can never be inlined because it uses "
 101                  "attributes conflicting with inlining", fn, fn);
 102       goto cannot_inline;
 103     }
 104
 105   /* If a function has pending sizes, we must not defer its
 106      compilation, and we can't inline it as a tree.  */
 107   if (fn == current_function_decl)
 108     {
 109       t = get_pending_sizes ();
 110       put_pending_sizes (t);
 111
 112       if (t)
 113         {
 114           if (do_warning)
 115             warning ("%Jfunction '%F' can never be inlined because it has "
 116                      "pending sizes", fn, fn);
 117           goto cannot_inline;
 118         }
 119     }
 120
 121   if (DECL_LANG_SPECIFIC (fn)->pending_sizes)
 122     {
 123       if (do_warning)
 124         warning ("%Jfunction '%F' can never be inlined because it has "
 125                  "pending sizes", fn, fn);
 126       goto cannot_inline;
 127     }
 128
 129   return 0;
 130
 131  cannot_inline:
 132   DECL_UNINLINABLE (fn) = 1;
 133   return 1;
 134 }
 135
 136 /* Called from check_global_declarations.  */
 137
 138 bool
 139 c_warn_unused_global_decl (tree decl)
 140 {
 141   if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
 142     return false;
 143   if (DECL_IN_SYSTEM_HEADER (decl))
 144     return false;
 145
 146   return true;
 147 }
 148
 149 /* Initialization common to C and Objective-C front ends.  */
 150 bool
 151 c_objc_common_init (void)
 152 {
 153   static const enum tree_code stmt_codes[] = {
 154     c_common_stmt_codes
 155   };
 156
 157   INIT_STATEMENT_CODES (stmt_codes);
 158
 159   c_init_decl_processing ();
 160
 161   if (c_common_init () == false)
 162     return false;
 163
 164   lang_expand_decl_stmt = c_expand_decl_stmt;
 165
 166   /* These were not defined in the Objective-C front end, but I'm
 167      putting them here anyway.  The diagnostic format decoder might
 168      want an enhanced ObjC implementation.  */
 169   diagnostic_format_decoder (global_dc) = &c_tree_printer;
 170   lang_missing_noreturn_ok_p = &c_missing_noreturn_ok_p;
 171
 172   /* If still unspecified, make it match -std=c99
 173      (allowing for -pedantic-errors).  */
 174   if (mesg_implicit_function_declaration < 0)
 175     {
 176       if (flag_isoc99)
 177         mesg_implicit_function_declaration = flag_pedantic_errors ? 2 : 1;
 178       else
 179         mesg_implicit_function_declaration = 0;
 180     }
 181
 182   return true;
 183 }
 184
 185 static tree
 186 start_cdtor (int method_type)
 187 {
 188   tree fnname = get_file_function_name (method_type);
 189   tree void_list_node_1 = build_tree_list (NULL_TREE, void_type_node);
 190   tree body;
 191
 192   start_function (void_list_node_1,
 193                   build_nt (CALL_EXPR, fnname,
 194                             tree_cons (NULL_TREE, NULL_TREE, void_list_node_1),
 195                             NULL_TREE),
 196                   NULL_TREE);
 197   store_parm_decls ();
 198
 199   current_function_cannot_inline
 200     = "static constructors and destructors cannot be inlined";
 201
 202   body = c_begin_compound_stmt ();
 203
 204   pushlevel (0);
 205   clear_last_expr ();
 206   add_scope_stmt (/*begin_p=*/1, /*partial_p=*/0);
 207
 208   return body;
 209 }
 210
 211 static void
 212 finish_cdtor (tree body)
 213 {
 214   tree scope;
 215   tree block;
 216
 217   scope = add_scope_stmt (/*begin_p=*/0, /*partial_p=*/0);
 218   block = poplevel (0, 0, 0);
 219   SCOPE_STMT_BLOCK (TREE_PURPOSE (scope)) = block;
 220   SCOPE_STMT_BLOCK (TREE_VALUE (scope)) = block;
 221
 222   RECHAIN_STMTS (body, COMPOUND_BODY (body));
 223
 224   finish_function ();
 225 }
 226
 227 /* Called at end of parsing, but before end-of-file processing.  */
 228
 229 void
 230 c_objc_common_finish_file (void)
 231 {
 232   if (pch_file)
 233     c_common_write_pch ();
 234
 235   /* If multiple translation units were built, copy information between
 236      them based on linkage rules.  */
 237   merge_translation_unit_decls ();
 238
 239   cgraph_finalize_compilation_unit ();
 240   cgraph_optimize ();
 241
 242   if (static_ctors)
 243     {
 244       tree body = start_cdtor ('I');
 245
 246       for (; static_ctors; static_ctors = TREE_CHAIN (static_ctors))
 247         c_expand_expr_stmt (build_function_call (TREE_VALUE (static_ctors),
 248                                                  NULL_TREE));
 249
 250       finish_cdtor (body);
 251     }
 252
 253   if (static_dtors)
 254     {
 255       tree body = start_cdtor ('D');
 256
 257       for (; static_dtors; static_dtors = TREE_CHAIN (static_dtors))
 258         c_expand_expr_stmt (build_function_call (TREE_VALUE (static_dtors),
 259                                                  NULL_TREE));
 260
 261       finish_cdtor (body);
 262     }
 263
 264   {
 265     int flags;
 266     FILE *stream = dump_begin (TDI_all, &flags);
 267
 268     if (stream)
 269       {
 270         dump_node (getdecls (), flags & ~TDF_SLIM, stream);
 271         dump_end (TDI_all, stream);
 272       }
 273   }
 274 }
 275
 276 /* Called during diagnostic message formatting process to print a
 277    source-level entity onto BUFFER.  The meaning of the format specifiers
 278    is as follows:
 279    %D: a general decl,
 280    %E: An expression,
 281    %F: a function declaration,
 282    %T: a type.
 283
 284    These format specifiers form a subset of the format specifiers set used
 285    by the C++ front-end.
 286    Please notice when called, the `%' part was already skipped by the
 287    diagnostic machinery.  */
 288 static bool
 289 c_tree_printer (pretty_printer *pp, text_info *text)
 290 {
 291   tree t = va_arg (*text->args_ptr, tree);
 292   const char *n = "({anonymous})";
 293
 294   switch (*text->format_spec)
 295     {
 296     case 'D':
 297     case 'F':
 298       if (DECL_NAME (t))
 299         n = (*lang_hooks.decl_printable_name) (t, 2);
 300       break;
 301
 302     case 'T':
 303       if (TREE_CODE (t) == TYPE_DECL)
 304         {
 305           if (DECL_NAME (t))
 306             n = (*lang_hooks.decl_printable_name) (t, 2);
 307         }
 308       else
 309         {
 310           t = TYPE_NAME (t);
 311           if (t)
 312             n = IDENTIFIER_POINTER (t);
 313         }
 314       break;
 315
 316     case 'E':
 317       if (TREE_CODE (t) == IDENTIFIER_NODE)
 318         n = IDENTIFIER_POINTER (t);
 319       else
 320         return false;
 321       break;
 322
 323     default:
 324       return false;
 325     }
 326
 327   pp_string (pp, n);
 328   return true;
 329 }