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 #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   tree t;
  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 ("%Jfunction %qF can never be inlined because it "
  82                  "is suppressed using -fno-inline", fn, 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 ("%Jfunction %qF can never be inlined because it might not "
  92                  "be bound within this unit of translation", fn, fn);
  93       goto cannot_inline;
  94     }
  95
  96   if (!function_attribute_inlinable_p (fn))
  97     {
  98       if (do_warning)
  99         warning ("%Jfunction %qF can never be inlined because it uses "
 100                  "attributes conflicting with inlining", fn, fn);
 101       goto cannot_inline;
 102     }
 103
 104   /* If a function has pending sizes, we must not defer its
 105      compilation, and we can't inline it as a tree.  */
 106   if (fn == current_function_decl)
 107     {
 108       t = get_pending_sizes ();
 109       put_pending_sizes (t);
 110
 111       if (t)
 112         {
 113           if (do_warning)
 114             warning ("%Jfunction %qF can never be inlined because it has "
 115                      "pending sizes", fn, fn);
 116           goto cannot_inline;
 117         }
 118     }
 119
 120   if (!DECL_FILE_SCOPE_P (fn))
 121     {
 122       /* If a nested function has pending sizes, we may have already
 123          saved them.  */
 124       if (DECL_LANG_SPECIFIC (fn)->pending_sizes)
 125         {
 126           if (do_warning)
 127             warning ("%Jnested function %qF can never be inlined because it "
 128                      "has possibly saved pending sizes", fn, fn);
 129           goto cannot_inline;
 130         }
 131     }
 132
 133   return 0;
 134
 135  cannot_inline:
 136   DECL_UNINLINABLE (fn) = 1;
 137   return 1;
 138 }
 139
 140 /* Called from check_global_declarations.  */
 141
 142 bool
 143 c_warn_unused_global_decl (tree decl)
 144 {
 145   if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
 146     return false;
 147   if (DECL_IN_SYSTEM_HEADER (decl))
 148     return false;
 149
 150   return true;
 151 }
 152
 153 /* Initialization common to C and Objective-C front ends.  */
 154 bool
 155 c_objc_common_init (void)
 156 {
 157   static const enum tree_code stmt_codes[] = {
 158     c_common_stmt_codes
 159   };
 160
 161   INIT_STATEMENT_CODES (stmt_codes);
 162
 163   c_init_decl_processing ();
 164
 165   if (c_common_init () == false)
 166     return false;
 167
 168   /* These were not defined in the Objective-C front end, but I'm
 169      putting them here anyway.  The diagnostic format decoder might
 170      want an enhanced ObjC implementation.  */
 171   diagnostic_format_decoder (global_dc) = &c_tree_printer;
 172
 173   /* If still unspecified, make it match -std=c99
 174      (allowing for -pedantic-errors).  */
 175   if (mesg_implicit_function_declaration < 0)
 176     {
 177       if (flag_isoc99)
 178         mesg_implicit_function_declaration = flag_pedantic_errors ? 2 : 1;
 179       else
 180         mesg_implicit_function_declaration = 0;
 181     }
 182
 183   return true;
 184 }
 185
 186 /* Called during diagnostic message formatting process to print a
 187    source-level entity onto BUFFER.  The meaning of the format specifiers
 188    is as follows:
 189    %D: a general decl,
 190    %E: an identifier or expression,
 191    %F: a function declaration,
 192    %T: a type.
 193
 194    These format specifiers form a subset of the format specifiers set used
 195    by the C++ front-end.
 196    Please notice when called, the `%' part was already skipped by the
 197    diagnostic machinery.  */
 198 static bool
 199 c_tree_printer (pretty_printer *pp, text_info *text)
 200 {
 201   tree t = va_arg (*text->args_ptr, tree);
 202   tree name;
 203   const char *n = "({anonymous})";
 204   c_pretty_printer *cpp = (c_pretty_printer *) pp;
 205   pp->padding = pp_none;
 206
 207   switch (*text->format_spec)
 208     {
 209     case 'D':
 210     case 'F':
 211       if (DECL_NAME (t))
 212         n = lang_hooks.decl_printable_name (t, 2);
 213       break;
 214
 215     case 'T':
 216       gcc_assert (TYPE_P (t));
 217       name = TYPE_NAME (t);
 218
 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         {
 239           pp_expression (cpp, t);
 240           return true;
 241         }
 242       break;
 243
 244     default:
 245       return false;
 246     }
 247
 248   pp_string (cpp, n);
 249   return true;
 250 }
 251
 252 tree
 253 c_objc_common_truthvalue_conversion (tree expr)
 254 {
 255  retry:
 256   switch (TREE_CODE (TREE_TYPE (expr)))
 257     {
 258     case ARRAY_TYPE:
 259       expr = default_conversion (expr);
 260       if (TREE_CODE (TREE_TYPE (expr)) != ARRAY_TYPE)
 261         goto retry;
 262
 263       error ("used array that cannot be converted to pointer where scalar is required");
 264       return error_mark_node;
 265
 266     case RECORD_TYPE:
 267       error ("used struct type value where scalar is required");
 268       return error_mark_node;
 269
 270     case UNION_TYPE:
 271       error ("used union type value where scalar is required");
 272       return error_mark_node;
 273     default:
 274       break;
 275     }
 276
 277   return c_common_truthvalue_conversion (expr);
 278 }
 279
 280 /* In C and ObjC, all decls have "C" linkage.  */
 281 bool
 282 has_c_linkage (tree decl ATTRIBUTE_UNUSED)
 283 {
 284   return true;
 285 }
 286
 287 void
 288 c_initialize_diagnostics (diagnostic_context *context)
 289 {
 290   pretty_printer *base = context->printer;
 291   c_pretty_printer *pp = XNEW (c_pretty_printer);
 292   memcpy (pp_base (pp), base, sizeof (pretty_printer));
 293   pp_c_pretty_printer_init (pp);
 294   context->printer = (pretty_printer *) pp;
 295
 296   /* It is safe to free this object because it was previously XNEW()'d.  */
 297   XDELETE (base);
 298 }