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, 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301, 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 *, const char *,
  44                             int, bool, bool, bool);
  45
  46 bool
  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   bool do_warning = (warn_inline
  73                      && DECL_INLINE (fn)
  74                      && DECL_DECLARED_INLINE_P (fn)
  75                      && !DECL_IN_SYSTEM_HEADER (fn));
  76
  77   if (flag_really_no_inline
  78       && lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) == NULL)
  79     {
  80       if (do_warning)
  81         warning (OPT_Winline, "function %q+F can never be inlined because it "
  82                  "is suppressed using -fno-inline", fn);
  83       goto cannot_inline;
  84     }
  85
  86   /* Don't auto-inline anything that might not be bound within
  87      this unit of translation.  */
  88   if (!DECL_DECLARED_INLINE_P (fn) && !targetm.binds_local_p (fn))
  89     {
  90       if (do_warning)
  91         warning (OPT_Winline, "function %q+F can never be inlined because it "
  92                  "might not be bound within this unit of translation", fn);
  93       goto cannot_inline;
  94     }
  95
  96   if (!function_attribute_inlinable_p (fn))
  97     {
  98       if (do_warning)
  99         warning (OPT_Winline, "function %q+F can never be inlined because it "
 100                  "uses attributes conflicting with inlining", fn);
 101       goto cannot_inline;
 102     }
 103
 104   return 0;
 105
 106  cannot_inline:
 107   DECL_UNINLINABLE (fn) = 1;
 108   return 1;
 109 }
 110
 111 /* Called from check_global_declarations.  */
 112
 113 bool
 114 c_warn_unused_global_decl (tree decl)
 115 {
 116   if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
 117     return false;
 118   if (DECL_IN_SYSTEM_HEADER (decl))
 119     return false;
 120
 121   return true;
 122 }
 123
 124 /* Initialization common to C and Objective-C front ends.  */
 125 bool
 126 c_objc_common_init (void)
 127 {
 128   c_init_decl_processing ();
 129
 130   if (c_common_init () == false)
 131     return false;
 132
 133   /* These were not defined in the Objective-C front end, but I'm
 134      putting them here anyway.  The diagnostic format decoder might
 135      want an enhanced ObjC implementation.  */
 136   diagnostic_format_decoder (global_dc) = &c_tree_printer;
 137
 138   /* If still unspecified, make it match -std=c99
 139      (allowing for -pedantic-errors).  */
 140   if (mesg_implicit_function_declaration < 0)
 141     {
 142       if (flag_isoc99)
 143         mesg_implicit_function_declaration = flag_pedantic_errors ? 2 : 1;
 144       else
 145         mesg_implicit_function_declaration = 0;
 146     }
 147
 148   return true;
 149 }
 150
 151 /* Called during diagnostic message formatting process to print a
 152    source-level entity onto BUFFER.  The meaning of the format specifiers
 153    is as follows:
 154    %D: a general decl,
 155    %E: an identifier or expression,
 156    %F: a function declaration,
 157    %T: a type.
 158
 159    These format specifiers form a subset of the format specifiers set used
 160    by the C++ front-end.
 161    Please notice when called, the `%' part was already skipped by the
 162    diagnostic machinery.  */
 163 static bool
 164 c_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
 165                 int precision, bool wide, bool set_locus, bool hash)
 166 {
 167   tree t = va_arg (*text->args_ptr, tree);
 168   tree name;
 169   const char *n = "({anonymous})";
 170   c_pretty_printer *cpp = (c_pretty_printer *) pp;
 171   pp->padding = pp_none;
 172
 173   if (precision != 0 || wide || hash)
 174     return false;
 175
 176   if (set_locus && text->locus)
 177     *text->locus = DECL_SOURCE_LOCATION (t);
 178
 179   switch (*spec)
 180     {
 181     case 'D':
 182       if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
 183         {
 184           t = DECL_DEBUG_EXPR (t);
 185           if (!DECL_P (t))
 186             {
 187               pp_c_expression (cpp, t);
 188               return true;
 189             }
 190         }
 191       /* FALLTHRU */
 192
 193     case 'F':
 194       if (DECL_NAME (t))
 195         n = lang_hooks.decl_printable_name (t, 2);
 196       break;
 197
 198     case 'T':
 199       gcc_assert (TYPE_P (t));
 200       name = TYPE_NAME (t);
 201
 202       if (name && TREE_CODE (name) == TYPE_DECL)
 203         {
 204           if (DECL_NAME (name))
 205             pp_string (cpp, lang_hooks.decl_printable_name (name, 2));
 206           else
 207             pp_type_id (cpp, t);
 208           return true;
 209         }
 210       else
 211         {
 212           pp_type_id (cpp, t);
 213           return true;
 214         }
 215       break;
 216
 217     case 'E':
 218       if (TREE_CODE (t) == IDENTIFIER_NODE)
 219         n = IDENTIFIER_POINTER (t);
 220       else
 221         {
 222           pp_expression (cpp, t);
 223           return true;
 224         }
 225       break;
 226
 227     default:
 228       return false;
 229     }
 230
 231   pp_string (cpp, n);
 232   return true;
 233 }
 234
 235 /* In C and ObjC, all decls have "C" linkage.  */
 236 bool
 237 has_c_linkage (tree decl ATTRIBUTE_UNUSED)
 238 {
 239   return true;
 240 }
 241
 242 void
 243 c_initialize_diagnostics (diagnostic_context *context)
 244 {
 245   pretty_printer *base = context->printer;
 246   c_pretty_printer *pp = XNEW (c_pretty_printer);
 247   memcpy (pp_base (pp), base, sizeof (pretty_printer));
 248   pp_c_pretty_printer_init (pp);
 249   context->printer = (pretty_printer *) pp;
 250
 251   /* It is safe to free this object because it was previously XNEW()'d.  */
 252   XDELETE (base);
 253 }
 254
 255 int
 256 c_types_compatible_p (tree x, tree y)
 257 {
 258     return comptypes (TYPE_MAIN_VARIANT (x), TYPE_MAIN_VARIANT (y));
 259 }
 260
 261 /* Determine if the type is a vla type for the backend.  */
 262
 263 bool
 264 c_vla_unspec_p (tree x, tree fn ATTRIBUTE_UNUSED)
 265 {
 266   return c_vla_type_p (x);
 267 }