gcc/c-objc-common.c

   1 /* Some code common to C and ObjC front ends.
   2    Copyright (C) 2001, 2002, 2003, 2004, 2005 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 "c-tree.h"
  30 #include "c-pretty-print.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 "tree-mudflap.h"
  40 #include "target.h"
  41 #include "c-objc-common.h"
  42
  43 static bool c_tree_printer (pretty_printer *, text_info *);
  44
  45 bool
  46 c_missing_noreturn_ok_p (tree decl)
  47 {
  48   /* A missing noreturn is not ok for freestanding implementations and
  49      ok for the `main' function in hosted implementations.  */
  50   return flag_hosted && MAIN_NAME_P (DECL_ASSEMBLER_NAME (decl));
  51 }
  52
  53 /* We want to inline `extern inline' functions even if this would
  54    violate inlining limits.  Some glibc and linux constructs depend on
  55    such functions always being inlined when optimizing.  */
  56
  57 int
  58 c_disregard_inline_limits (tree fn)
  59 {
  60   if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) != NULL)
  61     return 1;
  62
  63   return (!flag_really_no_inline && DECL_DECLARED_INLINE_P (fn)
  64           && DECL_EXTERNAL (fn));
  65 }
  66
  67 int
  68 c_cannot_inline_tree_fn (tree *fnp)
  69 {
  70   tree fn = *fnp;
  71   bool do_warning = (warn_inline
  72                      && DECL_INLINE (fn)
  73                      && DECL_DECLARED_INLINE_P (fn)
  74                      && !DECL_IN_SYSTEM_HEADER (fn));
  75
  76   if (flag_really_no_inline
  77       && lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) == NULL)
  78     {
  79       if (do_warning)
  80         warning ("%Jfunction %qF can never be inlined because it "
  81                  "is suppressed using -fno-inline", fn, fn);
  82       goto cannot_inline;
  83     }
  84
  85   /* Don't auto-inline anything that might not be bound within
  86      this unit of translation.  */
  87   if (!DECL_DECLARED_INLINE_P (fn) && !targetm.binds_local_p (fn))
  88     {
  89       if (do_warning)
  90         warning ("%Jfunction %qF can never be inlined because it might not "
  91                  "be bound within this unit of translation", fn, fn);
  92       goto cannot_inline;
  93     }
  94
  95   if (!function_attribute_inlinable_p (fn))
  96     {
  97       if (do_warning)
  98         warning ("%Jfunction %qF can never be inlined because it uses "
  99                  "attributes conflicting with inlining", fn, fn);
 100       goto cannot_inline;
 101     }
 102
 103   return 0;
 104
 105  cannot_inline:
 106   DECL_UNINLINABLE (fn) = 1;
 107   return 1;
 108 }
 109
 110 /* Called from check_global_declarations.  */
 111
 112 bool
 113 c_warn_unused_global_decl (tree decl)
 114 {
 115   if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
 116     return false;
 117   if (DECL_IN_SYSTEM_HEADER (decl))
 118     return false;
 119
 120   return true;
 121 }
 122
 123 /* Initialization common to C and Objective-C front ends.  */
 124 bool
 125 c_objc_common_init (void)
 126 {
 127   static const enum tree_code stmt_codes[] = {
 128     c_common_stmt_codes
 129   };
 130
 131   INIT_STATEMENT_CODES (stmt_codes);
 132
 133   c_init_decl_processing ();
 134
 135   if (c_common_init () == false)
 136     return false;
 137
 138   /* These were not defined in the Objective-C front end, but I'm
 139      putting them here anyway.  The diagnostic format decoder might
 140      want an enhanced ObjC implementation.  */
 141   diagnostic_format_decoder (global_dc) = &c_tree_printer;
 142
 143   /* If still unspecified, make it match -std=c99
 144      (allowing for -pedantic-errors).  */
 145   if (mesg_implicit_function_declaration < 0)
 146     {
 147       if (flag_isoc99)
 148         mesg_implicit_function_declaration = flag_pedantic_errors ? 2 : 1;
 149       else
 150         mesg_implicit_function_declaration = 0;
 151     }
 152
 153   return true;
 154 }
 155
 156 /* Called during diagnostic message formatting process to print a
 157    source-level entity onto BUFFER.  The meaning of the format specifiers
 158    is as follows:
 159    %D: a general decl,
 160    %E: an identifier or expression,
 161    %F: a function declaration,
 162    %T: a type.
 163
 164    These format specifiers form a subset of the format specifiers set used
 165    by the C++ front-end.
 166    Please notice when called, the `%' part was already skipped by the
 167    diagnostic machinery.  */
 168 static bool
 169 c_tree_printer (pretty_printer *pp, text_info *text)
 170 {
 171   tree t = va_arg (*text->args_ptr, tree);
 172   tree name;
 173   const char *n = "({anonymous})";
 174   c_pretty_printer *cpp = (c_pretty_printer *) pp;
 175   pp->padding = pp_none;
 176
 177   switch (*text->format_spec)
 178     {
 179     case 'D':
 180       if (DECL_DEBUG_EXPR (t) && DECL_DEBUG_EXPR_IS_FROM (t))
 181         {
 182           t = DECL_DEBUG_EXPR (t);
 183           if (!DECL_P (t))
 184             {
 185               pp_c_expression (cpp, t);
 186               return true;
 187             }
 188         }
 189       /* FALLTHRU */
 190
 191     case 'F':
 192       if (DECL_NAME (t))
 193         n = lang_hooks.decl_printable_name (t, 2);
 194       break;
 195
 196     case 'T':
 197       gcc_assert (TYPE_P (t));
 198       name = TYPE_NAME (t);
 199
 200       if (name && TREE_CODE (name) == TYPE_DECL)
 201         {
 202           if (DECL_NAME (name))
 203             pp_string (cpp, lang_hooks.decl_printable_name (name, 2));
 204           else
 205             pp_type_id (cpp, t);
 206           return true;
 207         }
 208       else
 209         {
 210           pp_type_id (cpp, t);
 211           return true;
 212         }
 213       break;
 214
 215     case 'E':
 216       if (TREE_CODE (t) == IDENTIFIER_NODE)
 217         n = IDENTIFIER_POINTER (t);
 218       else
 219         {
 220           pp_expression (cpp, t);
 221           return true;
 222         }
 223       break;
 224
 225     default:
 226       return false;
 227     }
 228
 229   pp_string (cpp, n);
 230   return true;
 231 }
 232
 233 tree
 234 c_objc_common_truthvalue_conversion (tree expr)
 235 {
 236  retry:
 237   switch (TREE_CODE (TREE_TYPE (expr)))
 238     {
 239     case ARRAY_TYPE:
 240       expr = default_conversion (expr);
 241       if (TREE_CODE (TREE_TYPE (expr)) != ARRAY_TYPE)
 242         goto retry;
 243
 244       error ("used array that cannot be converted to pointer where scalar is required");
 245       return error_mark_node;
 246
 247     case RECORD_TYPE:
 248       error ("used struct type value where scalar is required");
 249       return error_mark_node;
 250
 251     case UNION_TYPE:
 252       error ("used union type value where scalar is required");
 253       return error_mark_node;
 254     default:
 255       break;
 256     }
 257
 258   return c_common_truthvalue_conversion (expr);
 259 }
 260
 261 /* In C and ObjC, all decls have "C" linkage.  */
 262 bool
 263 has_c_linkage (tree decl ATTRIBUTE_UNUSED)
 264 {
 265   return true;
 266 }
 267
 268 void
 269 c_initialize_diagnostics (diagnostic_context *context)
 270 {
 271   pretty_printer *base = context->printer;
 272   c_pretty_printer *pp = XNEW (c_pretty_printer);
 273   memcpy (pp_base (pp), base, sizeof (pretty_printer));
 274   pp_c_pretty_printer_init (pp);
 275   context->printer = (pretty_printer *) pp;
 276
 277   /* It is safe to free this object because it was previously XNEW()'d.  */
 278   XDELETE (base);
 279 }
 280
 281 int
 282 c_types_compatible_p (tree x, tree y)
 283 {
 284     return comptypes (TYPE_MAIN_VARIANT (x), TYPE_MAIN_VARIANT (y));
 285 }