gcc/c/c-objc-common.c

   1 /* Some code common to C and ObjC front ends.
   2    Copyright (C) 2001-2014 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 3, 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 COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "tree.h"
  24 #include "c-tree.h"
  25 #include "intl.h"
  26 #include "c-family/c-pretty-print.h"
  27 #include "flags.h"
  28 #include "diagnostic.h"
  29 #include "tree-pretty-print.h"
  30 #include "langhooks.h"
  31 #include "c-objc-common.h"
  32
  33 #include <new>                          // For placement new.
  34
  35 static bool c_tree_printer (pretty_printer *, text_info *, const char *,
  36                             int, bool, bool, bool);
  37
  38 bool
  39 c_missing_noreturn_ok_p (tree decl)
  40 {
  41   /* A missing noreturn is not ok for freestanding implementations and
  42      ok for the `main' function in hosted implementations.  */
  43   return flag_hosted && MAIN_NAME_P (DECL_ASSEMBLER_NAME (decl));
  44 }
  45
  46 /* Called from check_global_declarations.  */
  47
  48 bool
  49 c_warn_unused_global_decl (const_tree decl)
  50 {
  51   if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
  52     return false;
  53   if (DECL_IN_SYSTEM_HEADER (decl))
  54     return false;
  55
  56   return true;
  57 }
  58
  59 /* Initialization common to C and Objective-C front ends.  */
  60 bool
  61 c_objc_common_init (void)
  62 {
  63   c_init_decl_processing ();
  64
  65   if (c_common_init () == false)
  66     return false;
  67
  68   /* These were not defined in the Objective-C front end, but I'm
  69      putting them here anyway.  The diagnostic format decoder might
  70      want an enhanced ObjC implementation.  */
  71   diagnostic_format_decoder (global_dc) = &c_tree_printer;
  72
  73   return true;
  74 }
  75
  76 /* Called during diagnostic message formatting process to print a
  77    source-level entity onto BUFFER.  The meaning of the format specifiers
  78    is as follows:
  79    %D: a general decl,
  80    %E: an identifier or expression,
  81    %F: a function declaration,
  82    %T: a type.
  83    %V: a list of type qualifiers from a tree.
  84    %v: an explicit list of type qualifiers
  85    %#v: an explicit list of type qualifiers of a function type.
  86
  87    Please notice when called, the `%' part was already skipped by the
  88    diagnostic machinery.  */
  89 static bool
  90 c_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
  91                 int precision, bool wide, bool set_locus, bool hash)
  92 {
  93   tree t = NULL_TREE;
  94   tree name;
  95   // FIXME: the next cast should be a dynamic_cast, when it is permitted.
  96   c_pretty_printer *cpp = (c_pretty_printer *) pp;
  97   pp->padding = pp_none;
  98
  99   if (precision != 0 || wide)
 100     return false;
 101
 102   if (*spec == 'K')
 103     {
 104       percent_K_format (text);
 105       return true;
 106     }
 107
 108   if (*spec != 'v')
 109     {
 110       t = va_arg (*text->args_ptr, tree);
 111       if (set_locus && text->locus)
 112         *text->locus = DECL_SOURCE_LOCATION (t);
 113     }
 114
 115   switch (*spec)
 116     {
 117     case 'D':
 118       if (TREE_CODE (t) == VAR_DECL && DECL_HAS_DEBUG_EXPR_P (t))
 119         {
 120           t = DECL_DEBUG_EXPR (t);
 121           if (!DECL_P (t))
 122             {
 123               cpp->expression (t);
 124               return true;
 125             }
 126         }
 127       /* FALLTHRU */
 128
 129     case 'F':
 130       if (DECL_NAME (t))
 131         {
 132           pp_identifier (cpp, lang_hooks.decl_printable_name (t, 2));
 133           return true;
 134         }
 135       break;
 136
 137     case 'T':
 138       gcc_assert (TYPE_P (t));
 139       name = TYPE_NAME (t);
 140
 141       if (name && TREE_CODE (name) == TYPE_DECL)
 142         {
 143           if (DECL_NAME (name))
 144             pp_identifier (cpp, lang_hooks.decl_printable_name (name, 2));
 145           else
 146             cpp->type_id (t);
 147           return true;
 148         }
 149       else
 150         {
 151           cpp->type_id (t);
 152           return true;
 153         }
 154       break;
 155
 156     case 'E':
 157       if (TREE_CODE (t) == IDENTIFIER_NODE)
 158         pp_identifier (cpp, IDENTIFIER_POINTER (t));
 159       else
 160         cpp->expression (t);
 161       return true;
 162
 163     case 'V':
 164       pp_c_type_qualifier_list (cpp, t);
 165       return true;
 166
 167     case 'v':
 168       pp_c_cv_qualifiers (cpp, va_arg (*text->args_ptr, int), hash);
 169       return true;
 170
 171     default:
 172       return false;
 173     }
 174
 175   pp_string (cpp, _("({anonymous})"));
 176   return true;
 177 }
 178
 179 /* In C and ObjC, all decls have "C" linkage.  */
 180 bool
 181 has_c_linkage (const_tree decl ATTRIBUTE_UNUSED)
 182 {
 183   return true;
 184 }
 185
 186 void
 187 c_initialize_diagnostics (diagnostic_context *context)
 188 {
 189   c_common_initialize_diagnostics (context);
 190
 191   pretty_printer *base = context->printer;
 192   c_pretty_printer *pp = XNEW (c_pretty_printer);
 193   context->printer = new (pp) c_pretty_printer ();
 194
 195   /* It is safe to free this object because it was previously XNEW()'d.  */
 196   base->~pretty_printer ();
 197   XDELETE (base);
 198 }
 199
 200 int
 201 c_types_compatible_p (tree x, tree y)
 202 {
 203   return comptypes (TYPE_MAIN_VARIANT (x), TYPE_MAIN_VARIANT (y));
 204 }
 205
 206 /* Determine if the type is a vla type for the backend.  */
 207
 208 bool
 209 c_vla_unspec_p (tree x, tree fn ATTRIBUTE_UNUSED)
 210 {
 211   return c_vla_type_p (x);
 212 }