diff options
Diffstat (limited to 'elf/dlfcn.h')
| -rw-r--r-- | elf/dlfcn.h | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/elf/dlfcn.h b/elf/dlfcn.h index 825b4843c1..e0b17d392a 100644 --- a/elf/dlfcn.h +++ b/elf/dlfcn.h @@ -1,5 +1,5 @@ /* User functions for run-time dynamic loading. - Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc. + Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -70,6 +70,34 @@ typedef struct } Dl_info; extern int dladdr __P ((const void *__address, Dl_info *__info)); +#ifdef __USE_GNU +/* To support profiling of shared objects it is a good idea to call + the function found using `dlsym' using the following macro since + these calls do not use the PLT. But this would mean the dynamic + loader has no chance to find out when the function is called. The + macro applies the necessary magic so that profiling is possible. + Rewrite + foo = (*fctp) (arg1, arg2); + into + foo = DL_CALL_FCT (fctp, (arg1, arg2)); +*/ +# if __GNUC__ >= 2 +/* Do not ever use this variable directly, it is internal! */ +extern struct link_map *_dl_profile_map; + +# define DL_CALL_FCT(fctp, args) \ + (__extension__ ({ if (_dl_profile_map != NULL) \ + _dl_mcount_wrapper_check (fctp); \ + (*fctp) args; }) +# else +/* This feature is not available without GCC. */ +# define DL_CALL_FCT(fctp, args) (*fctp) args +# endif + +/* This function calls the profiling functions. */ +extern void _dl_mcount_wrapper_check __P ((void *__selfpc)); +#endif + __END_DECLS #endif /* dlfcn.h */ |