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 "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
  42 static bool c_tree_printer (pretty_printer *, text_info *);
  43
  44 bool
  45 c_missing_noreturn_ok_p (tree decl)
  46 {
  47   /* A missing noreturn is not ok for freestanding implementations and
  48      ok for the `main' function in hosted implementations.  */
  49   return flag_hosted && MAIN_NAME_P (DECL_ASSEMBLER_NAME (decl));
  50 }
  51
  52 /* We want to inline `extern inline' functions even if this would
  53    violate inlining limits.  Some glibc and linux constructs depend on
  54    such functions always being inlined when optimizing.  */
  55
  56 int
  57 c_disregard_inline_limits (tree fn)
  58 {
  59   if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) != NULL)
  60     return 1;
  61
  62   return (!flag_really_no_inline && DECL_DECLARED_INLINE_P (fn)
  63           && DECL_EXTERNAL (fn));
  64 }
  65
  66 int
  67 c_cannot_inline_tree_fn (tree *fnp)
  68 {
  69   tree fn = *fnp;
  70   tree t;
  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 '%F' 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 '%F' 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 '%F' can never be inlined because it uses "
  99                  "attributes conflicting with inlining", fn, fn);
 100       goto cannot_inline;
 101     }
 102
 103   /* If a function has pending sizes, we must not defer its
 104      compilation, and we can't inline it as a tree.  */
 105   if (fn == current_function_decl)
 106     {
 107       t = get_pending_sizes ();
 108       put_pending_sizes (t);
 109
 110       if (t)
 111         {
 112           if (do_warning)
 113             warning ("%Jfunction '%F' can never be inlined because it has "
 114                      "pending sizes", fn, fn);
 115           goto cannot_inline;
 116         }
 117     }
 118
 119   if (! DECL_FILE_SCOPE_P (fn))
 120     {
 121       /* If a nested function has pending sizes, we may have already
 122          saved them.  */
 123       if (DECL_LANG_SPECIFIC (fn)->pending_sizes)
 124         {
 125           if (do_warning)
 126             warning ("%Jnested function '%F' can never be inlined because it "
 127                      "has possibly saved pending sizes", fn, fn);
 128           goto cannot_inline;
 129         }
 130     }
 131
 132   return 0;
 133
 134  cannot_inline:
 135   DECL_UNINLINABLE (fn) = 1;
 136   return 1;
 137 }
 138
 139 /* Called from check_global_declarations.  */
 140
 141 bool
 142 c_warn_unused_global_decl (tree decl)
 143 {
 144   if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
 145     return false;
 146   if (DECL_IN_SYSTEM_HEADER (decl))
 147     return false;
 148
 149   return true;
 150 }
 151
 152 /* Initialization common to C and Objective-C front ends.  */
 153 bool
 154 c_objc_common_init (void)
 155 {
 156   static const enum tree_code stmt_codes[] = {
 157     c_common_stmt_codes
 158   };
 159
 160   INIT_STATEMENT_CODES (stmt_codes);
 161
 162   c_init_decl_processing ();
 163
 164   if (c_common_init () == false)
 165     return false;
 166
 167   /* These were not defined in the Objective-C front end, but I'm
 168      putting them here anyway.  The diagnostic format decoder might
 169      want an enhanced ObjC implementation.  */
 170   diagnostic_format_decoder (global_dc) = &c_tree_printer;
 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 /* Called during diagnostic message formatting process to print a
 186    source-level entity onto BUFFER.  The meaning of the format specifiers
 187    is as follows:
 188    %D: a general decl,
 189    %E: An expression,
 190    %F: a function declaration,
 191    %T: a type.
 192
 193    These format specifiers form a subset of the format specifiers set used
 194    by the C++ front-end.
 195    Please notice when called, the `%' part was already skipped by the
 196    diagnostic machinery.  */
 197 static bool
 198 c_tree_printer (pretty_printer *pp, text_info *text)
 199 {
 200   tree t = va_arg (*text->args_ptr, tree);
 201   tree name;
 202   const char *n = "({anonymous})";
 203   c_pretty_printer *cpp = (c_pretty_printer *) pp;
 204   pp->padding = pp_none;
 205
 206   switch (*text->format_spec)
 207     {
 208     case 'D':
 209     case 'F':
 210       if (DECL_NAME (t))
 211         n = lang_hooks.decl_printable_name (t, 2);
 212       break;
 213
 214     case 'T':
 215       if (TYPE_P (t))
 216         name = TYPE_NAME (t);
 217       else
 218         abort ();
 219       if (name && TREE_CODE (name) == TYPE_DECL)
 220         {
 221           if (DECL_NAME (name))
 222             pp_string (cpp, lang_hooks.decl_printable_name (name, 2));
 223           else
 224             pp_type_id (cpp, t);
 225           return true;
 226         }
 227       else
 228         {
 229           pp_type_id (cpp, t);
 230           return true;
 231         }
 232       break;
 233
 234     case 'E':
 235       if (TREE_CODE (t) == IDENTIFIER_NODE)
 236         n = IDENTIFIER_POINTER (t);
 237       else
 238         return false;
 239       break;
 240
 241     default:
 242       return false;
 243     }
 244
 245   pp_string (cpp, n);
 246   return true;
 247 }
 248
 249 tree
 250 c_objc_common_truthvalue_conversion (tree expr)
 251 {
 252  retry:
 253   switch (TREE_CODE (TREE_TYPE (expr)))
 254     {
 255     case ARRAY_TYPE:
 256       expr = default_conversion (expr);
 257       if (TREE_CODE (TREE_TYPE (expr)) != ARRAY_TYPE)
 258         goto retry;
 259
 260       error ("used array that cannot be converted to pointer where scalar is required");
 261       return error_mark_node;
 262
 263     case RECORD_TYPE:
 264       error ("used struct type value where scalar is required");
 265       return error_mark_node;
 266
 267     case UNION_TYPE:
 268       error ("used union type value where scalar is required");
 269       return error_mark_node;
 270     default:
 271       break;
 272     }
 273
 274   return c_common_truthvalue_conversion (expr);
 275 }
 276
 277 /* In C and ObjC, all decls have "C" linkage.  */
 278 bool
 279 has_c_linkage (tree decl ATTRIBUTE_UNUSED)
 280 {
 281   return true;
 282 }
 283
 284 void
 285 c_initialize_diagnostics (diagnostic_context *context)
 286 {
 287   pretty_printer *base = context->printer;
 288   c_pretty_printer *pp = xmalloc (sizeof (c_pretty_printer));
 289   memcpy (pp_base (pp), base, sizeof (pretty_printer));
 290   pp_c_pretty_printer_init (pp);
 291   context->printer = (pretty_printer *) pp;
 292
 293   /* It is safe to free this object because it was previously malloc()'d.  */
 294   free (base);
 295 }