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
c_missing_noreturn_ok_p(tree decl)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
c_disregard_inline_limits(tree fn)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
c_cannot_inline_tree_fn(tree * fnp)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
c_warn_unused_global_decl(tree decl)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
c_objc_common_init(void)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
c_tree_printer(pretty_printer * pp,text_info * text,const char * spec,int precision,bool wide,bool set_locus,bool hash)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
has_c_linkage(tree decl ATTRIBUTE_UNUSED)237 has_c_linkage (tree decl ATTRIBUTE_UNUSED)
238 {
239 return true;
240 }
241
242 void
c_initialize_diagnostics(diagnostic_context * context)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
c_types_compatible_p(tree x,tree y)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
c_vla_unspec_p(tree x,tree fn ATTRIBUTE_UNUSED)264 c_vla_unspec_p (tree x, tree fn ATTRIBUTE_UNUSED)
265 {
266 return c_vla_type_p (x);
267 }
268