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--- Libc/Libc-1725.40.4/stdlib/FreeBSD/atexit.c
+++ Libc/Libc-825.26/stdlib/FreeBSD/atexit.c
@@ -30,27 +30,18 @@
* SUCH DAMAGE.
*/
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wimplicit-function-declaration"
-#pragma clang diagnostic ignored "-Wstrict-prototypes"
-#pragma clang diagnostic ignored "-Winvalid-pp-token"
-#pragma clang diagnostic ignored "-Wint-conversion"
-
#if defined(LIBC_SCCS) && !defined(lint)
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 1.8 2007/01/09 00:28:09 imp Exp $");
-#include <TargetConditionals.h>
#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__)) && !TARGET_OS_DRIVERKIT
+#if defined(__DYNAMIC__) || defined (__BLOCKS__)
#include <dlfcn.h>
#endif /* defined(__DYNAMIC__) */
#include "atexit.h"
@@ -58,10 +49,8 @@
#ifdef __BLOCKS__
#include <Block.h>
-#include <Block_private.h>
#endif /* __BLOCKS__ */
#include "libc_private.h"
-#include <os/alloc_once_private.h>
#define ATEXIT_FN_EMPTY 0
#define ATEXIT_FN_STD 1
@@ -93,15 +82,7 @@
};
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);
-}
+static int new_registration;
/*
* Register the function described by 'fptr' to be called at application
@@ -111,10 +92,13 @@
static int
atexit_register(struct atexit_fn *fptr)
{
- struct atexit *p = __atexit;
- assert(p);
+ static struct atexit __atexit0; /* one guaranteed table */
+ struct atexit *p;
+
_MUTEX_LOCK(&atexit_mutex);
- while (p->ind >= ATEXIT_SIZE) {
+ if ((p = __atexit) == NULL)
+ __atexit = p = &__atexit0;
+ else while (p->ind >= ATEXIT_SIZE) {
struct atexit *old__atexit;
old__atexit = __atexit;
_MUTEX_UNLOCK(&atexit_mutex);
@@ -134,7 +118,7 @@
__atexit = p;
}
p->fns[p->ind++] = *fptr;
- __atexit_new_registration = 1;
+ new_registration = 1;
_MUTEX_UNLOCK(&atexit_mutex);
return 0;
}
@@ -146,20 +130,20 @@
atexit(void (*func)(void))
{
struct atexit_fn fn;
+ struct dl_info info;
int error;
fn.fn_type = ATEXIT_FN_STD;
fn.fn_ptr.std_func = func;
fn.fn_arg = NULL;
+#if defined(__DYNAMIC__)
+ if ( dladdr(func, &info) )
+ fn.fn_dso = info.dli_fbase;
+ else
+ fn.fn_dso = NULL;
+#else /* ! defined(__DYNAMIC__) */
fn.fn_dso = NULL;
-
-#if defined(__DYNAMIC__) && !TARGET_OS_IPHONE && !TARGET_OS_DRIVERKIT
- // <rdar://problem/14596032&15173956>
- struct dl_info info;
- if (dladdr(func, &info)) {
- fn.fn_dso = info.dli_fbase;
- }
-#endif
+#endif /* defined(__DYNAMIC__) */
error = atexit_register(&fn);
return (error);
@@ -170,12 +154,20 @@
atexit_b(void (^block)(void))
{
struct atexit_fn fn;
+ struct dl_info info;
int error;
fn.fn_type = ATEXIT_FN_BLK;
fn.fn_ptr.block = Block_copy(block);
fn.fn_arg = NULL;
+#if defined(__DYNAMIC__)
+ if ( dladdr(block, &info) )
+ fn.fn_dso = info.dli_fbase;
+ else
+ fn.fn_dso = NULL;
+#else /* ! defined(__DYNAMIC__) */
fn.fn_dso = NULL;
+#endif /* defined(__DYNAMIC__) */
error = atexit_register(&fn);
return (error);
@@ -201,138 +193,48 @@
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;
-
-#if __has_feature(ptrauth_calls)
- // Strip the pointer so that range checks work. If we call the pointer, it will
- // still be signed though.
- addr = (uintptr_t)__builtin_ptrauth_strip((void*)addr, ptrauth_key_function_pointer);
-#endif
-
- 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 handlers registered via __cxa_atexit/atexit that are in a
- * a range specified.
- * Note: rangeCount==0, means call all handlers.
+/*
+ * 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_ranges(const struct __cxa_range_t ranges[], unsigned int count)
+__cxa_finalize(const void *dso)
{
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;) {
- 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.
+ 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;
+ new_registration = 0;
+ _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();
+#ifdef __BLOCKS__
+ else if (fn.fn_type == ATEXIT_FN_BLK)
+ fn.fn_ptr.block();
+#endif /* __BLOCKS__ */
_MUTEX_LOCK(&atexit_mutex);
- if (__atexit_new_registration) {
+ if (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_OS_OSX
-/*
- * 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
-#pragma clang diagnostic pop