DWARF_GET_WEAKS(3) Library Functions Manual DWARF_GET_WEAKS(3)

dwarf_get_weaks, dwarf_weak_cu_offset, dwarf_weak_die_offset, dwarf_weak_name_offsets, dwarf_weakname — retrieve information about weak symbols

DWARF Access Library (libdwarf, -ldwarf)

#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);

These functions retrieve information about weak symbols from the lookup tables in the (SGI-specific) “.debug_weaknames” section. Information 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 () 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 () returns the offset, relative to the “.debug_info” section, of the compilation unit that contains the debugging information entry associated with the argument weak. Argument cu_offset should point to a location that will hold the returned offset.

Function () 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 () 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 information 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 () 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.

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 () 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) function.

If argument err is not NULL, these functions will use it to store error information, in case of an error.

On success, these functions returns DW_DLV_OK. In case of an error, they return DW_DLV_ERROR and set the argument err.

These functions may fail with the following errors:

[]
One of the arguments cu_die_offset, cu_offset, dbg, die_offset, weak, weaks, name, or nweaks was NULL.
[]
The DWARF debugging context referenced by argument dbg did not contain information about weak symbols.

dwarf(3), dwarf_get_cu_die_offset_given_cu_header_offset(3), dwarf_weaks_dealloc(3)

April 10, 2011 NetBSD 11.0