uwx_find_source_info.3x (2010 09)

u
uwx_find_source_info(3X) uwx_find_source_info(3X)
(Integrity Systems Only)
NAME
uwx_find_source_info() - obtain source information from ELF files
SYNOPSIS
#include <uwx.h>
int uwx_find_source_info(
struct uwx_env *env,
struct uwx_symbol_cache **
cachep ,
char *mod,
uint64_t relip ,
uint64_t relfuncstart ,
int inline_context
,
char **ifuncp ,
char **funcp ,
uint64_t *offsetp ,
char **srcfilep,
int *linenump ,
int *inline_contextp
);
DESCRIPTION
uwx_find_source_info()
is part of the Unwind Express Library for Integrity systems; see uwx(3X).
uwx_find_source_info()
obtains source file and line number information for a given IP (instruc-
tion pointer) from the symbolic information stored in the ELF object file, if available. To use this inter-
face, the name of the load module and the relative offset of the IP from the beginning of that module’s text
segment must be known. See dlmodinfo (3C) and dlgetname (3C) for information on obtaining information
about load modules.
This entry point is provided for cases where an application may wish to perform a quick stack unwind
operation, saving only the IP values in an array, then later produce a symbolic report. It may also be
used independently of any stack unwind operation (note that an unwind environment object must be pro-
vided, but it does not need to have a current context). For obtaining source information while unwinding,
see uwx_get_sym_info(3X) and uwx_get_source_info(3X).
Parameters
env A pointer to an unwind environment object. The state of the unwind environment does
not matter except that the allocate and free callback routines are used for memory alloca-
tion.
cachep A pointer to a symbol cache pointer. The symbol cache is an opaque object created and
maintained within the Unwind Express Library. If cachep is NULL, no symbol cache will
be created. If cachep is not NULL, it must point to a pointer whose initial value is
NULL.
uwx_find_source_info()
will create a symbol cache and store a pointer to
the cache in
*cachep for use on subsequent calls. The cache can be released by calling
uwx_release_symbol_cache(). The symbol cache may be shared with
uwx_find_symbol().
mod The name of the load module. This must be the name of an executable ELF object file (a
main program or a shared library).
relip The offset of the IP relative to the start of the load module’s text segment.
relfuncstart The offset of the start of the function containing the IP, relative to the start of the load
module’s text segment. If the function start address is not known, the relip can be passed
instead. (The advantage of knowing the function start address is that symbol lookup can
be faster and more reliable.)
inline_context The value of the inline context identifier. This should be 0 except when stepping through
inlined calls.
ifuncp Pointer to a variable of type char * where the inlined function name will be returned. If
NULL, the inlined function name will not be returned. If the IP of the current context is
not in an inlined call or if symbolic debug information is not available, a NULL pointer
will be returned.
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1