Update to gcc-3.4.6
[dragonfly.git] / contrib / gcc-3.4 / gcc / c-objc-common.c
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003757ed
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1/* Some code common to C and ObjC front ends.
2 Copyright (C) 2001, 2002, 2003, 2004 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, 59 Temple Place - Suite 330, Boston, MA
1902111-1307, 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 "expr.h"
30#include "c-tree.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 "target.h"
40#include "cgraph.h"
41
42static bool c_tree_printer (pretty_printer *, text_info *);
43static tree start_cdtor (int);
44static void finish_cdtor (tree);
45
46int
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 tree t;
73 bool do_warning = (warn_inline
74 && DECL_INLINE (fn)
75 && DECL_DECLARED_INLINE_P (fn)
76 && !DECL_IN_SYSTEM_HEADER (fn));
77
78 if (flag_really_no_inline
79 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) == NULL)
80 {
81 if (do_warning)
82 warning ("%Jfunction '%F' can never be inlined because it "
83 "is suppressed using -fno-inline", fn, fn);
84 goto cannot_inline;
85 }
86
87 /* Don't auto-inline anything that might not be bound within
88 this unit of translation. */
89 if (!DECL_DECLARED_INLINE_P (fn) && !(*targetm.binds_local_p) (fn))
90 {
91 if (do_warning)
92 warning ("%Jfunction '%F' can never be inlined because it might not "
93 "be bound within this unit of translation", fn, fn);
94 goto cannot_inline;
95 }
96
97 if (! function_attribute_inlinable_p (fn))
98 {
99 if (do_warning)
100 warning ("%Jfunction '%F' can never be inlined because it uses "
101 "attributes conflicting with inlining", fn, fn);
102 goto cannot_inline;
103 }
104
105 /* If a function has pending sizes, we must not defer its
106 compilation, and we can't inline it as a tree. */
107 if (fn == current_function_decl)
108 {
109 t = get_pending_sizes ();
110 put_pending_sizes (t);
111
112 if (t)
113 {
114 if (do_warning)
115 warning ("%Jfunction '%F' can never be inlined because it has "
116 "pending sizes", fn, fn);
117 goto cannot_inline;
118 }
119 }
120
1378ea41 121 if (DECL_LANG_SPECIFIC (fn)->pending_sizes)
003757ed 122 {
1378ea41
SS
123 if (do_warning)
124 warning ("%Jfunction '%F' can never be inlined because it has "
125 "pending sizes", fn, fn);
126 goto cannot_inline;
003757ed
MD
127 }
128
129 return 0;
130
131 cannot_inline:
132 DECL_UNINLINABLE (fn) = 1;
133 return 1;
134}
135
136/* Called from check_global_declarations. */
137
138bool
139c_warn_unused_global_decl (tree decl)
140{
141 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
142 return false;
143 if (DECL_IN_SYSTEM_HEADER (decl))
144 return false;
145
146 return true;
147}
148
149/* Initialization common to C and Objective-C front ends. */
150bool
151c_objc_common_init (void)
152{
153 static const enum tree_code stmt_codes[] = {
154 c_common_stmt_codes
155 };
156
157 INIT_STATEMENT_CODES (stmt_codes);
158
159 c_init_decl_processing ();
160
161 if (c_common_init () == false)
162 return false;
163
164 lang_expand_decl_stmt = c_expand_decl_stmt;
165
166 /* These were not defined in the Objective-C front end, but I'm
167 putting them here anyway. The diagnostic format decoder might
168 want an enhanced ObjC implementation. */
169 diagnostic_format_decoder (global_dc) = &c_tree_printer;
170 lang_missing_noreturn_ok_p = &c_missing_noreturn_ok_p;
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
185static tree
186start_cdtor (int method_type)
187{
188 tree fnname = get_file_function_name (method_type);
189 tree void_list_node_1 = build_tree_list (NULL_TREE, void_type_node);
190 tree body;
191
192 start_function (void_list_node_1,
193 build_nt (CALL_EXPR, fnname,
194 tree_cons (NULL_TREE, NULL_TREE, void_list_node_1),
195 NULL_TREE),
196 NULL_TREE);
197 store_parm_decls ();
198
199 current_function_cannot_inline
200 = "static constructors and destructors cannot be inlined";
201
202 body = c_begin_compound_stmt ();
203
204 pushlevel (0);
205 clear_last_expr ();
206 add_scope_stmt (/*begin_p=*/1, /*partial_p=*/0);
207
208 return body;
209}
210
211static void
212finish_cdtor (tree body)
213{
214 tree scope;
215 tree block;
216
217 scope = add_scope_stmt (/*begin_p=*/0, /*partial_p=*/0);
218 block = poplevel (0, 0, 0);
219 SCOPE_STMT_BLOCK (TREE_PURPOSE (scope)) = block;
220 SCOPE_STMT_BLOCK (TREE_VALUE (scope)) = block;
221
222 RECHAIN_STMTS (body, COMPOUND_BODY (body));
223
224 finish_function ();
225}
226
227/* Called at end of parsing, but before end-of-file processing. */
228
229void
230c_objc_common_finish_file (void)
231{
232 if (pch_file)
233 c_common_write_pch ();
234
235 /* If multiple translation units were built, copy information between
236 them based on linkage rules. */
237 merge_translation_unit_decls ();
238
239 cgraph_finalize_compilation_unit ();
240 cgraph_optimize ();
241
242 if (static_ctors)
243 {
244 tree body = start_cdtor ('I');
245
246 for (; static_ctors; static_ctors = TREE_CHAIN (static_ctors))
247 c_expand_expr_stmt (build_function_call (TREE_VALUE (static_ctors),
248 NULL_TREE));
249
250 finish_cdtor (body);
251 }
252
253 if (static_dtors)
254 {
255 tree body = start_cdtor ('D');
256
257 for (; static_dtors; static_dtors = TREE_CHAIN (static_dtors))
258 c_expand_expr_stmt (build_function_call (TREE_VALUE (static_dtors),
259 NULL_TREE));
260
261 finish_cdtor (body);
262 }
263
264 {
265 int flags;
266 FILE *stream = dump_begin (TDI_all, &flags);
267
268 if (stream)
269 {
270 dump_node (getdecls (), flags & ~TDF_SLIM, stream);
271 dump_end (TDI_all, stream);
272 }
273 }
274}
275
276/* Called during diagnostic message formatting process to print a
277 source-level entity onto BUFFER. The meaning of the format specifiers
278 is as follows:
279 %D: a general decl,
280 %E: An expression,
281 %F: a function declaration,
282 %T: a type.
283
284 These format specifiers form a subset of the format specifiers set used
285 by the C++ front-end.
286 Please notice when called, the `%' part was already skipped by the
287 diagnostic machinery. */
288static bool
289c_tree_printer (pretty_printer *pp, text_info *text)
290{
291 tree t = va_arg (*text->args_ptr, tree);
292 const char *n = "({anonymous})";
293
294 switch (*text->format_spec)
295 {
296 case 'D':
297 case 'F':
298 if (DECL_NAME (t))
299 n = (*lang_hooks.decl_printable_name) (t, 2);
300 break;
301
302 case 'T':
303 if (TREE_CODE (t) == TYPE_DECL)
304 {
305 if (DECL_NAME (t))
306 n = (*lang_hooks.decl_printable_name) (t, 2);
307 }
308 else
309 {
310 t = TYPE_NAME (t);
311 if (t)
312 n = IDENTIFIER_POINTER (t);
313 }
314 break;
315
316 case 'E':
317 if (TREE_CODE (t) == IDENTIFIER_NODE)
318 n = IDENTIFIER_POINTER (t);
319 else
320 return false;
321 break;
322
323 default:
324 return false;
325 }
326
327 pp_string (pp, n);
328 return true;
329}