Libc-1158.50.2.tar.gz

[apple/libc.git] / stdlib / FreeBSD / atexit.c

diff --git a/stdlib/FreeBSD/atexit.c b/stdlib/FreeBSD/atexit.c
index bd94bcd7230d91f3e5fe39850f64d02b78dd3576..99f311f67f689720ed787192d89864d1bf771d3e 100644 (file)
--- a/stdlib/FreeBSD/atexit.c
+++ b/stdlib/FreeBSD/atexit.c
@@ -13,10 +13,6 @@
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.

- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *     This product includes software developed by the University of
- *     California, Berkeley and its contributors.

  * 4. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  * 4. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.


@@ -38,21 +34,36 @@
 static char sccsid[] = "@(#)atexit.c   8.2 (Berkeley) 7/3/94";
 #endif /* LIBC_SCCS and not lint */
 #include <sys/cdefs.h>
 static char sccsid[] = "@(#)atexit.c   8.2 (Berkeley) 7/3/94";
 #endif /* LIBC_SCCS and not lint */
 #include <sys/cdefs.h>

-__FBSDID("$FreeBSD: src/lib/libc/stdlib/atexit.c,v 1.7 2003/12/19 17:11:20 kan Exp $");
+__FBSDID("$FreeBSD: src/lib/libc/stdlib/atexit.c,v 1.8 2007/01/09 00:28:09 imp Exp $");

 
 #include "namespace.h"
 
 #include "namespace.h"

+#include <errno.h>

 #include <stddef.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <unistd.h>

+#include <assert.h>

 #include <pthread.h>
 #include <pthread.h>

+#if defined(__DYNAMIC__) || defined (__BLOCKS__)
+#include <dlfcn.h>
+#endif /* defined(__DYNAMIC__) */

 #include "atexit.h"
 #include "un-namespace.h"
 
 #include "atexit.h"
 #include "un-namespace.h"
 

+#ifdef __BLOCKS__
+#include <Block.h>
+#include <Block_private.h>
+#endif /* __BLOCKS__ */

 #include "libc_private.h"
 #include "libc_private.h"

+#include <os/alloc_once_private.h>
+
+#include <TargetConditionals.h>

 
 #define        ATEXIT_FN_EMPTY 0
 #define        ATEXIT_FN_STD   1
 #define        ATEXIT_FN_CXA   2
 
 #define        ATEXIT_FN_EMPTY 0
 #define        ATEXIT_FN_STD   1
 #define        ATEXIT_FN_CXA   2

+#ifdef __BLOCKS__
+#define        ATEXIT_FN_BLK   3
+#endif /* __BLOCKS__ */

 
 static pthread_mutex_t atexit_mutex = PTHREAD_MUTEX_INITIALIZER;
 
 
 static pthread_mutex_t atexit_mutex = PTHREAD_MUTEX_INITIALIZER;
 


@@ -67,6 +78,9 @@ struct atexit {
                union {
                        void (*std_func)(void);
                        void (*cxa_func)(void *);
                union {
                        void (*std_func)(void);
                        void (*cxa_func)(void *);

+#ifdef __BLOCKS__
+                       void (^block)(void);
+#endif /* __BLOCKS__ */

                } fn_ptr;                       /* function pointer */
                void *fn_arg;                   /* argument for CXA callback */
                void *fn_dso;                   /* shared module handle */
                } fn_ptr;                       /* function pointer */
                void *fn_arg;                   /* argument for CXA callback */
                void *fn_dso;                   /* shared module handle */


@@ -74,6 +88,15 @@ struct atexit {
 };
 
 static struct atexit *__atexit;                /* points to head of LIFO stack */
 };
 
 static struct atexit *__atexit;                /* points to head of LIFO stack */

+static int __atexit_new_registration;
+
+__attribute__ ((visibility ("hidden")))
+void
+__atexit_init(void)
+{
+       __atexit = os_alloc_once(OS_ALLOC_ONCE_KEY_LIBSYSTEM_C,
+                       sizeof(struct atexit), NULL);
+}

 
 /*
  * Register the function described by 'fptr' to be called at application
 
 /*
  * Register the function described by 'fptr' to be called at application


@@ -83,13 +106,10 @@ static struct atexit *__atexit;            /* points to head of LIFO stack */
 static int
 atexit_register(struct atexit_fn *fptr)
 {
 static int
 atexit_register(struct atexit_fn *fptr)
 {

-       static struct atexit __atexit0; /* one guaranteed table */
-       struct atexit *p;
-
+       struct atexit *p = __atexit;
+       assert(p);

        _MUTEX_LOCK(&atexit_mutex);
        _MUTEX_LOCK(&atexit_mutex);

-       if ((p = __atexit) == NULL)
-               __atexit = p = &__atexit0;
-       else while (p->ind >= ATEXIT_SIZE) {
+       while (p->ind >= ATEXIT_SIZE) {

                struct atexit *old__atexit;
                old__atexit = __atexit;
                _MUTEX_UNLOCK(&atexit_mutex);
                struct atexit *old__atexit;
                old__atexit = __atexit;
                _MUTEX_UNLOCK(&atexit_mutex);


@@ -109,6 +129,7 @@ atexit_register(struct atexit_fn *fptr)
                __atexit = p;
        }
        p->fns[p->ind++] = *fptr;
                __atexit = p;
        }
        p->fns[p->ind++] = *fptr;

+       __atexit_new_registration = 1;

        _MUTEX_UNLOCK(&atexit_mutex);
        return 0;
 }
        _MUTEX_UNLOCK(&atexit_mutex);
        return 0;
 }


@@ -123,14 +144,39 @@ atexit(void (*func)(void))
        int error;
 
        fn.fn_type = ATEXIT_FN_STD;
        int error;
 
        fn.fn_type = ATEXIT_FN_STD;

-       fn.fn_ptr.std_func = func;;
+       fn.fn_ptr.std_func = func;

        fn.fn_arg = NULL;
        fn.fn_dso = NULL;
 
        fn.fn_arg = NULL;
        fn.fn_dso = NULL;
 

+#if defined(__DYNAMIC__) && !TARGET_OS_IPHONE
+       // <rdar://problem/14596032&15173956>
+       struct dl_info info;
+       if (dladdr(func, &info)) {
+               fn.fn_dso = info.dli_fbase;
+       }
+#endif
+

        error = atexit_register(&fn);   
        return (error);
 }
 
        error = atexit_register(&fn);   
        return (error);
 }
 

+#ifdef __BLOCKS__
+int
+atexit_b(void (^block)(void))
+{
+       struct atexit_fn fn;
+       int error;
+
+       fn.fn_type = ATEXIT_FN_BLK;
+       fn.fn_ptr.block = Block_copy(block);
+       fn.fn_arg = NULL;
+       fn.fn_dso = NULL;
+
+       error = atexit_register(&fn);   
+       return (error);
+}
+#endif /* __BLOCKS__ */
+

 /*
  * Register a function to be performed at exit or when an shared object
  * with given dso handle is unloaded dynamically.
 /*
  * Register a function to be performed at exit or when an shared object
  * with given dso handle is unloaded dynamically.


@@ -150,40 +196,131 @@ __cxa_atexit(void (*func)(void *), void *arg, void *dso)
        return (error);
 }
 
        return (error);
 }
 

+static bool
+__cxa_in_range(const struct __cxa_range_t ranges[],
+                          unsigned int count,
+                          const void* fn)
+{
+       uintptr_t addr = (uintptr_t)fn;
+
+       unsigned int i;
+       for (i = 0; i < count; ++i) {
+               const struct __cxa_range_t *r = &ranges[i];
+               if (addr < (uintptr_t)r->addr) {
+                       continue;
+               }
+               if (addr < ((uintptr_t)r->addr + r->length)) {
+                       return true;
+               }
+       }
+       return false;
+}
+

 /*
 /*

- * Call all handlers registered with __cxa_atexit for the shared
- * object owning 'dso'.  Note: if 'dso' is NULL, then all remaining
- * handlers are called.
+ * Call handlers registered via __cxa_atexit/atexit that are in a
+ * a range specified.
+ * Note: rangeCount==0, means call all handlers.

  */
 void
  */
 void

-__cxa_finalize(void *dso)
+__cxa_finalize_ranges(const struct __cxa_range_t ranges[], unsigned int count)

 {
        struct atexit *p;
 {
        struct atexit *p;

-       struct atexit_fn fn;
+       struct atexit_fn *fn;

        int n;
        int n;

-

        _MUTEX_LOCK(&atexit_mutex);
        _MUTEX_LOCK(&atexit_mutex);

+
+restart:

        for (p = __atexit; p; p = p->next) {
                for (n = p->ind; --n >= 0;) {
        for (p = __atexit; p; p = p->next) {
                for (n = p->ind; --n >= 0;) {

-                       if (p->fns[n].fn_type == ATEXIT_FN_EMPTY)
-                               continue; /* already been called */
-                       if (dso != NULL && dso != p->fns[n].fn_dso)
-                               continue; /* wrong DSO */
-                       fn = p->fns[n];
-                       /*
-                         Mark entry to indicate that this particular handler
-                         has already been called.
-                       */
-                       p->fns[n].fn_type = ATEXIT_FN_EMPTY;
-                       _MUTEX_UNLOCK(&atexit_mutex);
-               
-                       /* Call the function of correct type. */
-                       if (fn.fn_type == ATEXIT_FN_CXA)
-                               fn.fn_ptr.cxa_func(fn.fn_arg);
-                       else if (fn.fn_type == ATEXIT_FN_STD)
-                               fn.fn_ptr.std_func();
+                       fn = &p->fns[n];
+
+                       if (fn->fn_type == ATEXIT_FN_EMPTY) {
+                               continue; // already been called
+                       }
+
+                       // Verify that the entry is within the range being unloaded.
+                       if (count > 0) {
+                               if (fn->fn_type == ATEXIT_FN_CXA) {
+                                       // for __cxa_atexit(), call if *dso* is in range be unloaded
+                                       if (!__cxa_in_range(ranges, count, fn->fn_dso)) {
+                                               continue; // not being unloaded yet
+                                       }
+                               } else if (fn->fn_type == ATEXIT_FN_STD) {
+                                       // for atexit, call if *function* is in range be unloaded
+                                       if (!__cxa_in_range(ranges, count,  fn->fn_ptr.std_func)) {
+                                               continue; // not being unloaded yet
+                                       }
+#ifdef __BLOCKS__
+                               } else if (fn->fn_type == ATEXIT_FN_BLK) {
+                                       // for atexit_b, call if block code is in range be unloaded
+                                       void *a = ((struct Block_layout *)fn->fn_ptr.block)->invoke;
+                                       if (!__cxa_in_range(ranges, count, a)) {
+                                               continue; // not being unloaded yet
+                                       }
+#endif // __BLOCKS__
+                               }
+                       }
+
+                       // Clear the entry to indicate that this handler has been called.
+                       int fn_type = fn->fn_type;
+                       fn->fn_type = ATEXIT_FN_EMPTY;
+
+                       // Detect recursive registrations.
+                       __atexit_new_registration = 0;
+                       _MUTEX_UNLOCK(&atexit_mutex);
+
+                       // Call the handler.
+                       if (fn_type == ATEXIT_FN_CXA) {
+                               fn->fn_ptr.cxa_func(fn->fn_arg);
+                       } else if (fn_type == ATEXIT_FN_STD) {
+                               fn->fn_ptr.std_func();
+#ifdef __BLOCKS__
+                       } else if (fn_type == ATEXIT_FN_BLK) {
+                               fn->fn_ptr.block();
+#endif // __BLOCKS__
+                       }
+
+                       // Call any recursively registered handlers.

                        _MUTEX_LOCK(&atexit_mutex);
                        _MUTEX_LOCK(&atexit_mutex);

+                       if (__atexit_new_registration) {
+                           goto restart;
+                       }

                }
        }
        _MUTEX_UNLOCK(&atexit_mutex);
 }
                }
        }
        _MUTEX_UNLOCK(&atexit_mutex);
 }

+
+
+/*
+ * Call all handlers registered with __cxa_atexit for the shared
+ * object owning 'dso'.  Note: if 'dso' is NULL, then all remaining
+ * handlers are called.
+ */
+void
+__cxa_finalize(const void *dso)
+{
+       if (dso != NULL) {
+               // Note: this should not happen as only dyld should be calling
+               // this and dyld has switched to call __cxa_finalize_ranges directly.
+               struct __cxa_range_t range;
+               range.addr = dso;
+               range.length = 1;
+               __cxa_finalize_ranges(&range, 1);
+       } else {
+               __cxa_finalize_ranges(NULL, 0);
+       }
+}
+
+#if !TARGET_IPHONE_SIMULATOR && (__i386__ || __x86_64__)
+/*
+ * Support for thread_local in C++, using existing _tlv_atexit() in libdyld
+ */
+
+void _tlv_atexit(void(*f)(void*), void* arg); /* in libdyld */
+
+void
+__cxa_thread_atexit(void(*f)(void*), void* arg)
+{
+    _tlv_atexit(f, arg);
+}
+#endif