1/* Some code common to C and ObjC front ends.
2   Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 2, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING.  If not, write to the Free
18Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
1902110-1301, 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
43static bool c_tree_printer (pretty_printer *, text_info *, const char *,
44			    int, bool, bool, bool);
45
46bool
47c_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
58int
59c_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
68int
69c_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
113bool
114c_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.  */
125bool
126c_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.  */
163static bool
164c_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.  */
236bool
237has_c_linkage (tree decl ATTRIBUTE_UNUSED)
238{
239  return true;
240}
241
242void
243c_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
255int
256c_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
263bool
264c_vla_unspec_p (tree x, tree fn ATTRIBUTE_UNUSED)
265{
266  return c_vla_type_p (x);
267}
268