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newlib-2.1.0

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git-svn-id: svn://kolibrios.org@4921 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Sergey Semyonov (Serge)
2014-05-10 22:12:19 +00:00
parent 914e67bd24
commit 7315bb05c0
204 changed files with 10781 additions and 3986 deletions
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60
contrib/sdk/sources/newlib/libc/stdlib/__atexit.c
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@@ -1,5 +1,35 @@
/*
* Common routine to implement atexit-like functionality.
*
* This is also the key function to be configured as lite exit, a size-reduced
* implementation of exit that doesn't invoke clean-up functions such as _fini
* or global destructors.
*
* Default (without lite exit) call graph is like:
* _start -> atexit -> __register_exitproc
* _start -> __libc_init_array -> __cxa_atexit -> __register_exitproc
* on_exit -> __register_exitproc
* _start -> exit -> __call_exitprocs
*
* Here an -> means arrow tail invokes arrow head. All invocations here
* are non-weak reference in current newlib/libgloss.
*
* Lite exit makes some of above calls as weak reference, so that size expansive
* functions __register_exitproc and __call_exitprocs may not be linked. These
* calls are:
* _start w-> atexit
* __cxa_atexit w-> __register_exitproc
* exit w-> __call_exitprocs
*
* Lite exit also makes sure that __call_exitprocs will be referenced as non-weak
* whenever __register_exitproc is referenced as non-weak.
*
* Thus with lite exit libs, a program not explicitly calling atexit or on_exit
* will escape from the burden of cleaning up code. A program with atexit or on_exit
* will work consistently to normal libs.
*
* Lite exit is enabled with --enable-lite-exit, and is controlled with macro
* _LITE_EXIT.
*/
#include <stddef.h>
@@ -10,7 +40,23 @@
/* Make this a weak reference to avoid pulling in malloc. */
void * malloc(size_t) _ATTRIBUTE((__weak__));
__LOCK_INIT_RECURSIVE(, __atexit_lock);
#ifdef _LITE_EXIT
/* As __call_exitprocs is weak reference in lite exit, make a
non-weak reference to it here. */
const void * __atexit_dummy = &__call_exitprocs;
#endif
#ifndef __SINGLE_THREAD__
extern _LOCK_RECURSIVE_T __atexit_lock;
#endif
#ifdef _REENT_GLOBAL_ATEXIT
static struct _atexit _global_atexit0 = _ATEXIT_INIT;
# define _GLOBAL_ATEXIT0 (&_global_atexit0)
#else
# define _GLOBAL_ATEXIT0 (&_GLOBAL_REENT->_atexit0)
#endif
/*
* Register a function to be performed at exit or on shared library unload.
@@ -31,9 +77,9 @@ _DEFUN (__register_exitproc,
__lock_acquire_recursive(__atexit_lock);
#endif
p = _GLOBAL_REENT->_atexit;
p = _GLOBAL_ATEXIT;
if (p == NULL)
_GLOBAL_REENT->_atexit = p = &_GLOBAL_REENT->_atexit0;
_GLOBAL_ATEXIT = p = _GLOBAL_ATEXIT0;
if (p->_ind >= _ATEXIT_SIZE)
{
#ifndef _ATEXIT_DYNAMIC_ALLOC
@@ -53,11 +99,13 @@ _DEFUN (__register_exitproc,
return -1;
}
p->_ind = 0;
p->_next = _GLOBAL_REENT->_atexit;
_GLOBAL_REENT->_atexit = p;
p->_next = _GLOBAL_ATEXIT;
_GLOBAL_ATEXIT = p;
#ifndef _REENT_SMALL
p->_on_exit_args._fntypes = 0;
p->_on_exit_args._is_cxa = 0;
#else
p->_on_exit_args_ptr = NULL;
#endif
#endif
}
@@ -74,7 +122,7 @@ _DEFUN (__register_exitproc,
if (args == NULL)
{
#ifndef __SINGLE_THREAD__
__lock_release(lock);
__lock_release(__atexit_lock);
#endif
return -1;
}