DWARF_GET_WEAKS(3) BSD Library Functions Manual DWARF_GET_WEAKS(3)
NAME
dwarf_get_weaks, dwarf_weak_cu_offset, dwarf_weak_die_offset, dwarf_weak_name_offsets, dwarf_weakname -- retrieve information about weak sym-
bols
LIBRARY
DWARF Access Library (libdwarf, -ldwarf)
SYNOPSIS
#include <libdwarf.h>
int
dwarf_get_weaks(Dwarf_Debug dbg, Dwarf_Weak **weaks, Dwarf_Signed *nweaks, Dwarf_Error *err);
int
dwarf_weak_cu_offset(Dwarf_Weak weak, Dwarf_Off *cu_offset, Dwarf_Error *err);
int
dwarf_weak_die_offset(Dwarf_Weak weak, Dwarf_Off *die_offset, Dwarf_Error *err);
int
dwarf_weak_name_offsets(Dwarf_Weak weak, char **name, Dwarf_Off *die_offset, Dwarf_Off *cu_die_offset, Dwarf_Error *err);
int
dwarf_weakname(Dwarf_Weak weak, char **name, Dwarf_Error *err);
DESCRIPTION
These functions retrieve information about weak symbols from the lookup tables in the (SGI-specific) ``.debug_weaknames'' section. Informa-
tion about weak symbols is returned using opaque descriptors of type Dwarf_Weak. Applications need to use the functions described below to
retrieve the name and offset information contained in these descriptors.
Function dwarf_get_weaks() retrieves descriptors for all the weak symbols associated with the DWARF debug context specified by argument dbg.
The argument weaks should point to a location that will be set to a pointer to an array of Dwarf_Weak descriptors. The argument nweaks
should point to a location that will be set to the number of descriptors returned.
Function dwarf_weak_cu_offset() returns the offset, relative to the ``.debug_info'' section, of the compilation unit that contains the debug-
ging information entry associated with the argument weak. Argument cu_offset should point to a location that will hold the returned offset.
Function dwarf_weak_die_offset() retrieves the offset, relative to the ``.debug_info'' section, of the debugging information entry associated
with the argument weak, and stores it into the location pointed to by the argument die_offset.
Function dwarf_weak_name_offsets() retrieves the name and offsets for the debugging information entry for argument weak. Argument name
should point to a location which will be set to a pointer to a NUL-terminated string containing the name of the associated debugging informa-
tion entry. Argument die_offset should point to a location which will be set to the offset, relative to the ``.debug_info'' section, of the
associated debugging information entry. Argument cu_die_offset should point to a location which will be set to the offset, relative to the
``.debug_info'' section, of the first debugging information entry in the compilation unit associated with argument weak.
Function dwarf_weakname() sets the location pointed to by argument name to a pointer to a NUL-terminated string holding the name of the
debugging information entry associated with the argument weak.
Memory Management
The memory area used for the array of Dwarf_Weak descriptors returned in argument weaks by function dwarf_get_weaks() is owned by the DWARF
Access Library (libdwarf, -ldwarf). Application code should not attempt to directly free this pointer. Portable code should instead use the
function dwarf_weaks_dealloc(3) to indicate that the memory area may be freed.
The memory area used for the string returned in the name argument to functions dwarf_weak_name_offsets() and dwarf_weakname() is owned by the
DWARF Access Library (libdwarf, -ldwarf). Portable code should indicate that the memory area can be freed using the dwarf_dealloc(3) func-
tion.
Error Returns
If argument err is not NULL, these functions will use it to store error information, in case of an error.
RETURN VALUES
On success, these functions returns DW_DLV_OK. In case of an error, they return DW_DLV_ERROR and set the argument err.
ERRORS
These functions may fail with the following errors:
[DW_DLE_ARGUMENT] One of the arguments cu_die_offset, cu_offset, dbg, die_offset, weak, weaks, name, or nweaks was NULL.
[DW_DLE_NO_ENTRY] The DWARF debugging context referenced by argument dbg did not contain information about weak symbols.
SEE ALSO
dwarf(3), dwarf_get_cu_die_offset_given_cu_header_offset(3), dwarf_weaks_dealloc(3)
BSD
April 10, 2011 BSD