NAME

dwarf_get_globals, dwarf_global_cu_offset, dwarf_global_die_offset, dwarf_global_name_offsets, dwarf_globname —

retrieve information about global objects

LIBRARY

DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

#include <libdwarf.h>

int
dwarf_get_globals(Dwarf_Debug dbg, Dwarf_Global **globals, Dwarf_Signed *nglobals, Dwarf_Error *err);

int
dwarf_global_cu_offset(Dwarf_Global global, Dwarf_Off *cu_offset, Dwarf_Error *err);

int
dwarf_global_die_offset(Dwarf_Global global, Dwarf_Off *die_offset, Dwarf_Error *err);

int
dwarf_global_name_offsets(Dwarf_Global global, char **name, Dwarf_Off *die_offset, Dwarf_Off *cu_die_offset, Dwarf_Error *err);

int
dwarf_globname(Dwarf_Global global, char **name, Dwarf_Error *err);

DESCRIPTION

These functions retrieve information about global symbols from the lookup tables in the “.debug_pubnames” DWARF section. Information about these global symbols is returned using opaque descriptors of type Dwarf_Global. Applications need to use the functions described below to retrieve the name and the offsets for these descriptors.

Function dwarf_get_globals() retrieves descriptors for all the global symbols associated with the DWARF debug context specified by argument dbg. The argument globals should point to a location that will be set to a pointer to an array of Dwarf_Global descriptors. The argument nglobals should point to a location that will be set to the number of descriptors returned.

Function dwarf_global_cu_offset() returns the section-relative offset, relative to the “.debug_info” section, of the compilation unit that contains the debugging information entry associated with the argument global. Argument cu_offset should point to a location that will hold the returned offset.

Function dwarf_global_die_offset() retrieves the section-relative offset, relative to the “.debug_info” section, of the debugging information entry associated with the argument global, and stores it into the location pointed to by the argument die_offset.

Function dwarf_global_name_offsets() retrieves the name and the offsets for the debugging information entry for argument global. 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 a section-relative 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 a section-relative offset, relative to the “.debug_info” section, of the first debugging information entry in the compilation unit associated with argument global.

Function dwarf_globname() 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 global.

Memory Management

The memory area used for the array of Dwarf_Global descriptors returned in argument globals by function dwarf_get_globals() 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_globals_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_globname() and dwarf_global_name_offsets() is owned by the DWARF Access Library (libdwarf, -ldwarf). Portable code should use the dwarf_dealloc(3) function to indicate that the memory area may be freed.

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, global, globals, name, or nglobals was NULL.