2 * Copyright © 2011 Canonical Limited
4 * This library is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * licence, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
17 * Author: Ryan Lortie <desrt@desrt.ca>
22 #include "glib-init.h"
24 #include "glib-private.h"
26 #include "gutils.h" /* for GDebugKey */
27 #include "gconstructor.h"
28 #include "gmem.h" /* for g_mem_gc_friendly */
35 /* This seems as good a place as any to make static assertions about platform
36 * assumptions we make throughout GLib. */
38 /* We do not support 36-bit bytes or other historical curiosities. */
39 G_STATIC_ASSERT (CHAR_BIT == 8);
41 /* We assume that data pointers are the same size as function pointers... */
42 G_STATIC_ASSERT (sizeof (gpointer) == sizeof (GFunc));
43 G_STATIC_ASSERT (_g_alignof (gpointer) == _g_alignof (GFunc));
44 /* ... and that all function pointers are the same size. */
45 G_STATIC_ASSERT (sizeof (GFunc) == sizeof (GCompareDataFunc));
46 G_STATIC_ASSERT (_g_alignof (GFunc) == _g_alignof (GCompareDataFunc));
51 * This variable is %TRUE if the `G_DEBUG` environment variable
52 * includes the key `gc-friendly`.
54 #ifdef ENABLE_GC_FRIENDLY_DEFAULT
55 gboolean g_mem_gc_friendly = TRUE;
57 gboolean g_mem_gc_friendly = FALSE;
59 GLogLevelFlags g_log_msg_prefix = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_WARNING |
60 G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_DEBUG;
61 GLogLevelFlags g_log_always_fatal = G_LOG_FATAL_MASK;
64 debug_key_matches (const gchar *key,
68 /* may not call GLib functions: see note in g_parse_debug_string() */
69 for (; length; length--, key++, token++)
71 char k = (*key == '_') ? '-' : tolower (*key );
72 char t = (*token == '_') ? '-' : tolower (*token);
82 * g_parse_debug_string:
83 * @string: (allow-none): a list of debug options separated by colons, spaces, or
85 * @keys: (array length=nkeys): pointer to an array of #GDebugKey which associate
86 * strings with bit flags.
87 * @nkeys: the number of #GDebugKeys in the array.
89 * Parses a string containing debugging options
90 * into a %guint containing bit flags. This is used
91 * within GDK and GTK+ to parse the debug options passed on the
92 * command line or through environment variables.
94 * If @string is equal to "all", all flags are set. Any flags
95 * specified along with "all" in @string are inverted; thus,
96 * "all,foo,bar" or "foo,bar,all" sets all flags except those
97 * corresponding to "foo" and "bar".
99 * If @string is equal to "help", all the available keys in @keys
100 * are printed out to standard error.
102 * Returns: the combined set of bit flags.
105 g_parse_debug_string (const gchar *string,
106 const GDebugKey *keys,
115 /* this function is used during the initialisation of gmessages, gmem
116 * and gslice, so it may not do anything that causes memory to be
117 * allocated or risks messages being emitted.
119 * this means, more or less, that this code may not call anything
123 if (!strcasecmp (string, "help"))
125 /* using stdio directly for the reason stated above */
126 fprintf (stderr, "Supported debug values:");
127 for (i = 0; i < nkeys; i++)
128 fprintf (stderr, " %s", keys[i].key);
129 fprintf (stderr, " all help\n");
133 const gchar *p = string;
135 gboolean invert = FALSE;
139 q = strpbrk (p, ":;, \t");
143 if (debug_key_matches ("all", p, q - p))
149 for (i = 0; i < nkeys; i++)
150 if (debug_key_matches (keys[i].key, p, q - p))
151 result |= keys[i].value;
163 for (i = 0; i < nkeys; i++)
164 all_flags |= keys[i].value;
166 result = all_flags & (~result);
174 g_parse_debug_envvar (const gchar *envvar,
175 const GDebugKey *keys,
182 /* "fatal-warnings,fatal-criticals,all,help" is pretty short */
185 if (GetEnvironmentVariable (envvar, buffer, 100) < 100)
190 value = getenv (envvar);
194 return default_value;
196 return g_parse_debug_string (value, keys, n_keys);
200 g_messages_prefixed_init (void)
202 const GDebugKey keys[] = {
203 { "error", G_LOG_LEVEL_ERROR },
204 { "critical", G_LOG_LEVEL_CRITICAL },
205 { "warning", G_LOG_LEVEL_WARNING },
206 { "message", G_LOG_LEVEL_MESSAGE },
207 { "info", G_LOG_LEVEL_INFO },
208 { "debug", G_LOG_LEVEL_DEBUG }
211 g_log_msg_prefix = g_parse_debug_envvar ("G_MESSAGES_PREFIXED", keys, G_N_ELEMENTS (keys), g_log_msg_prefix);
217 const GDebugKey keys[] = {
218 { "gc-friendly", 1 },
219 {"fatal-warnings", G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL },
220 {"fatal-criticals", G_LOG_LEVEL_CRITICAL }
222 GLogLevelFlags flags;
224 flags = g_parse_debug_envvar ("G_DEBUG", keys, G_N_ELEMENTS (keys), 0);
226 g_log_always_fatal |= flags & G_LOG_LEVEL_MASK;
228 g_mem_gc_friendly = flags & 1;
234 g_messages_prefixed_init ();
238 #if defined (G_OS_WIN32)
240 BOOL WINAPI DllMain (HINSTANCE hinstDLL,
247 DllMain (HINSTANCE hinstDLL,
253 case DLL_PROCESS_ATTACH:
255 g_clock_win32_init ();
257 g_thread_win32_init ();
262 case DLL_THREAD_DETACH:
264 g_thread_win32_thread_detach ();
276 #elif defined (G_HAS_CONSTRUCTORS)
278 #ifdef G_DEFINE_CONSTRUCTOR_NEEDS_PRAGMA
279 #pragma G_DEFINE_CONSTRUCTOR_PRAGMA_ARGS(glib_init_ctor)
281 G_DEFINE_CONSTRUCTOR(glib_init_ctor)
284 glib_init_ctor (void)
290 # error Your platform/compiler is missing constructor support