Daily bump.
[official-gcc.git] / gcc / emutls.c
blobc3374a1c7de9accf63ff0073585de12f160f98ba
1 /* TLS emulation.
2 Copyright (C) 2006 Free Software Foundation, Inc.
3 Contributed by Jakub Jelinek <jakub@redhat.com>.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
10 version.
12 In addition to the permissions in the GNU General Public License, the
13 Free Software Foundation gives you unlimited permission to link the
14 compiled version of this file into combinations with other programs,
15 and to distribute those combinations without any restriction coming
16 from the use of this file. (The General Public License restrictions
17 do apply in other respects; for example, they cover modification of
18 the file, and distribution when not linked into a combine
19 executable.)
21 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
22 WARRANTY; without even the implied warranty of MERCHANTABILITY or
23 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
24 for more details.
26 You should have received a copy of the GNU General Public License
27 along with GCC; see the file COPYING. If not, write to the Free
28 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
29 02110-1301, USA. */
31 #include "tconfig.h"
32 #include "tsystem.h"
33 #include "coretypes.h"
34 #include "tm.h"
35 #include "gthr.h"
37 typedef unsigned int word __attribute__((mode(word)));
38 typedef unsigned int pointer __attribute__((mode(pointer)));
40 struct __emutls_object
42 word size;
43 word align;
44 union {
45 pointer offset;
46 void *ptr;
47 } loc;
48 void *templ;
51 struct __emutls_array
53 pointer size;
54 void **data[];
57 #ifdef __GTHREADS
58 #ifdef __GTHREAD_MUTEX_INIT
59 static __gthread_mutex_t emutls_mutex = __GTHREAD_MUTEX_INIT;
60 #else
61 static __gthread_mutex_t emutls_mutex;
62 #endif
63 static __gthread_key_t emutls_key;
64 static pointer emutls_size;
66 static void
67 emutls_destroy (void *ptr)
69 struct __emutls_array *arr = ptr;
70 pointer size = arr->size;
71 pointer i;
73 for (i = 0; i < size; ++i)
75 if (arr->data[i])
76 free (arr->data[i][-1]);
79 free (ptr);
82 static void
83 emutls_init (void)
85 #ifndef __GTHREAD_MUTEX_INIT
86 __GTHREAD_MUTEX_INIT_FUNCTION (&emutls_mutex);
87 #endif
88 if (__gthread_key_create (&emutls_key, emutls_destroy) != 0)
89 abort ();
91 #endif
93 static void *
94 emutls_alloc (struct __emutls_object *obj)
96 void *ptr;
97 void *ret;
99 /* We could use here posix_memalign if available and adjust
100 emutls_destroy accordingly. */
101 if (obj->align <= sizeof (void *))
103 ptr = malloc (obj->size + sizeof (void *));
104 if (ptr == NULL)
105 abort ();
106 ((void **) ptr)[0] = ptr;
107 ret = ptr + sizeof (void *);
109 else
111 ptr = malloc (obj->size + sizeof (void *) + obj->align - 1);
112 if (ptr == NULL)
113 abort ();
114 ret = (void *) (((pointer) (ptr + sizeof (void *) + obj->align - 1))
115 & ~(pointer)(obj->align - 1));
116 ((void **) ret)[-1] = ptr;
119 if (obj->templ)
120 memcpy (ret, obj->templ, obj->size);
121 else
122 memset (ret, 0, obj->size);
124 return ret;
127 void *
128 __emutls_get_address (struct __emutls_object *obj)
130 if (! __gthread_active_p ())
132 if (__builtin_expect (obj->loc.ptr == NULL, 0))
133 obj->loc.ptr = emutls_alloc (obj);
134 return obj->loc.ptr;
137 #ifndef __GTHREADS
138 abort ();
139 #else
140 pointer offset = obj->loc.offset;
142 if (__builtin_expect (offset == 0, 0))
144 static __gthread_once_t once = __GTHREAD_ONCE_INIT;
145 __gthread_once (&once, emutls_init);
146 __gthread_mutex_lock (&emutls_mutex);
147 offset = ++emutls_size;
148 obj->loc.offset = offset;
149 __gthread_mutex_unlock (&emutls_mutex);
152 struct __emutls_array *arr = __gthread_getspecific (emutls_key);
153 if (__builtin_expect (arr == NULL, 0))
155 pointer size = offset + 32;
156 arr = calloc (size, sizeof (void *));
157 if (arr == NULL)
158 abort ();
159 arr->size = size;
160 __gthread_setspecific (emutls_key, (void *) arr);
162 else if (__builtin_expect (offset >= arr->size, 0))
164 pointer orig_size = arr->size;
165 pointer size = orig_size * 2;
166 if (offset >= size)
167 size = offset + 32;
168 arr = realloc (arr, size * sizeof (void *));
169 if (arr == NULL)
170 abort ();
171 arr->size = size;
172 memset (arr->data + orig_size - 1, 0,
173 (size - orig_size) * sizeof (void *));
174 __gthread_setspecific (emutls_key, (void *) arr);
177 void *ret = arr->data[offset - 1];
178 if (__builtin_expect (ret == NULL, 0))
180 ret = emutls_alloc (obj);
181 arr->data[offset - 1] = ret;
183 return ret;
184 #endif
187 void
188 __emutls_register_common (struct __emutls_object *obj,
189 word size, word align, void *templ)
191 if (obj->size < size)
193 obj->size = size;
194 obj->templ = NULL;
196 if (obj->align < align)
197 obj->align = align;
198 if (templ && size == obj->size)
199 obj->templ = templ;