__FBSDID("$FreeBSD: src/lib/libc/stdlib/atexit.c,v 1.8 2007/01/09 00:28:09 imp Exp $");
#include "namespace.h"
+#include <errno.h>
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
+#include <assert.h>
#include <pthread.h>
+#if defined(__DYNAMIC__) || defined (__BLOCKS__)
+#include <dlfcn.h>
+#endif /* defined(__DYNAMIC__) */
#include "atexit.h"
#include "un-namespace.h"
+#ifdef __BLOCKS__
+#include <Block.h>
+#include <Block_private.h>
+#endif /* __BLOCKS__ */
#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
+#ifdef __BLOCKS__
+#define ATEXIT_FN_BLK 3
+#endif /* __BLOCKS__ */
static pthread_mutex_t atexit_mutex = PTHREAD_MUTEX_INITIALIZER;
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 */
};
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
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);
- 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);
__atexit = p;
}
p->fns[p->ind++] = *fptr;
+ __atexit_new_registration = 1;
_MUTEX_UNLOCK(&atexit_mutex);
return 0;
}
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;
+#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);
}
+#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.
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
-__cxa_finalize(void *dso)
+__cxa_finalize_ranges(const struct __cxa_range_t ranges[], unsigned int count)
{
struct atexit *p;
- struct atexit_fn fn;
+ struct atexit_fn *fn;
int n;
-
_MUTEX_LOCK(&atexit_mutex);
+
+restart:
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);
+ if (__atexit_new_registration) {
+ goto restart;
+ }
}
}
_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
projects / apple / libc.git / blobdiff