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c-common.c (c_common_nodes_and_builtins): Add _Exit builtin. 

* c-common.c (c_common_nodes_and_builtins): Add _Exit builtin.
	* extend.texi: Document _Exit builtin.

testsuite:
	* gcc.c-torture/execute/builtin-noret-1.c: New test.

From-SVN: r38771
This commit is contained in:
Joseph Myers 2001-01-07 11:26:15 +00:00 committed by Joseph Myers
parent 7ca3d2b152
commit 796cdb659f
5 changed files with 104 additions and 5 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2001-01-07 Joseph S. Myers <jsm28@cam.ac.uk>
* c-common.c (c_common_nodes_and_builtins): Add _Exit builtin.
* extend.texi: Document _Exit builtin.
2001-01-07 Neil Booth <neil@daikokuya.demon.co.uk>
* (initialize, initialize_builtins,

4
gcc/c-common.c
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@ -5558,9 +5558,11 @@ c_common_nodes_and_builtins ()
builtin_function_2 (NULL_PTR, "alloca", NULL_TREE, ptr_ftype_sizetype,
BUILT_IN_ALLOCA, BUILT_IN_NORMAL, 0, 1, 0);
#endif
/* Declare _exit just to mark it as non-returning. */
/* Declare _exit and _Exit just to mark them as non-returning. */
builtin_function_2 (NULL_PTR, "_exit", NULL_TREE, void_ftype_int,
0, NOT_BUILT_IN, 0, 1, 1);
builtin_function_2 (NULL_PTR, "_Exit", NULL_TREE, void_ftype_int,
0, NOT_BUILT_IN, 0, !flag_isoc99, 1);
builtin_function_2 ("__builtin_index", "index",
string_ftype_cstring_int, string_ftype_cstring_int,

10
gcc/extend.texi
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@ -3371,6 +3371,7 @@ function as well.
@findex creall
@findex exit
@findex _exit
@findex _Exit
@findex fabs
@findex fabsf
@findex fabsl
@ -3421,10 +3422,11 @@ option. Many of these functions are only optimized in certain cases; if
not optimized in a particular case, a call to the library function will
be emitted.
The functions @code{abort}, @code{exit}, and @code{_exit} are recognized
and presumed not to return, but otherwise are not built in.
@code{_exit} is not recognized in strict ISO C mode (@samp{-ansi},
@samp{-std=c89} or @samp{-std=c99}).
The functions @code{abort}, @code{exit}, @code{_Exit} and @code{_exit}
are recognized and presumed not to return, but otherwise are not built
in. @code{_exit} is not recognized in strict ISO C mode (@samp{-ansi},
@samp{-std=c89} or @samp{-std=c99}). @code{_Exit} is not recognized in
strict C89 mode (@samp{-ansi} or @samp{-std=c89}).
Outside strict ISO C mode, the functions @code{alloca}, @code{bcmp},
@code{bzero}, @code{index}, @code{rindex} and @code{ffs} may be handled

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2001-01-07 Joseph S. Myers <jsm28@cam.ac.uk>
* gcc.c-torture/execute/builtin-noret-1.c: New test.
2001-01-07 Joseph S. Myers <jsm28@cam.ac.uk>
* gcc.dg/format/format.h: New file.

86
gcc/testsuite/gcc.c-torture/execute/builtin-noret-1.c Normal file
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@ -0,0 +1,86 @@
/* Test for builtin noreturn attributes. */
/* Origin: Joseph Myers <jsm28@cam.ac.uk> */
extern void abort (void);
extern void exit (int);
#if 0 /* Doesn't work with prototype (bug?). */
extern void _exit (int);
extern void _Exit (int);
#endif
extern void tabort (void);
extern void texit (void);
extern void t_exit (void);
extern void t_Exit (void);
extern void link_failure (void);
int
main (void)
{
volatile int i = 0;
/* The real test here is that the program links. */
if (i)
tabort ();
if (i)
texit ();
if (i)
t_exit ();
if (i)
t_Exit ();
exit (0);
}
void
tabort (void)
{
abort ();
link_failure ();
}
void
texit (void)
{
exit (1);
link_failure ();
}
void
t_exit (void)
{
_exit (1);
link_failure ();
}
/* Some non-Unix libcs might not have _exit. This version should never
get called. */
static void
_exit (int i)
{
abort ();
}
void
t_Exit (void)
{
_Exit (1);
link_failure ();
}
/* Some libcs might not have _Exit. This version should never get called. */
static void
_Exit (int i)
{
abort ();
}
/* When optimizing, no calls to link_failure should remain. In any case,
link_failure should not be called. */
#ifndef __OPTIMIZE__
void
link_failure (void)
{
abort ();
}
#endif