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comparison usr/src/lib/libc/port/unwind/unwind.c @ 13726:056b82d21d71

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1450 Illumos should be buildable with GCC4 Reviewed by: Joshua M. Clulow <josh@sysmgr.org> Reviewed by: Keith Wesolowski <keith.wesolowski@joyent.com> Reviewed by: Gordon Ross <gwr@nexenta.com> Reviewed by: Albert Lee <trisk@nexenta.com> Approved by: Gordon Ross <gwr@nexenta.com>
author Richard Lowe <richlowe@richlowe.net>
date Sat, 14 Apr 2012 20:29:22 -0400
parents febeba71273d
children
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13725:9a3ca91fb74e 13726:056b82d21d71
22 /* 22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms. 24 * Use is subject to license terms.
25 */ 25 */
26 26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include "lint.h" 27 #include "lint.h"
30 #include "thr_uberdata.h" 28 #include "thr_uberdata.h"
31 #include <dlfcn.h> 29 #include <dlfcn.h>
32 30
33 /* 31 /*
38 36
39 /* 37 /*
40 * _ex_unwind() is provided by libC, but if libC is not loaded we 38 * _ex_unwind() is provided by libC, but if libC is not loaded we
41 * need to call a local version of _ex_unwind() which does exactly 39 * need to call a local version of _ex_unwind() which does exactly
42 * the same thing except for calling C++ destructors. 40 * the same thing except for calling C++ destructors.
41 *
42 * Note that neither of these literally "returns twice" as, for eg, setjmp
43 * does, but they induce unusual control flow which the compiler should treat
44 * in the same manner (make all registers dead, etc.).
43 */ 45 */
44 extern void _ex_clnup_handler(void *, void (*)(void *)); 46 extern void _ex_clnup_handler(void *, void (*)(void *)) __RETURNS_TWICE;
45 extern void _ex_unwind_local(void); 47 extern void _ex_unwind_local(void) __RETURNS_TWICE;
46 #pragma unknown_control_flow(_ex_clnup_handler) 48 #pragma unknown_control_flow(_ex_clnup_handler)
47 #pragma unknown_control_flow(_ex_unwind_local) 49 #pragma unknown_control_flow(_ex_unwind_local)
48 50
49 /* 51 /*
50 * _t_cancel(fp):calls cleanup handlers if there are any in 52 * _t_cancel(fp):calls cleanup handlers if there are any in