DWARF_DIEOFFSET(3) BSD Library Functions Manual DWARF_DIEOFFSET(3)
NAME
dwarf_die_CU_offset, dwarf_die_CU_offset_range, dwarf_dieoffset, dwarf_get_cu_die_offset_given_cu_header_offset,
dwarf_get_cu_die_offset_given_cu_header_offset_b -- return offsets of DWARF debugging information entries
LIBRARY
DWARF Access Library (libdwarf, -ldwarf)
SYNOPSIS
#include <libdwarf.h>
int
dwarf_die_CU_offset(Dwarf_Die die, Dwarf_Off *ret_offset, Dwarf_Error *err);
int
dwarf_die_CU_offset_range(Dwarf_Die die, Dwarf_Off *cu_offset, Dwarf_Off *cu_length, Dwarf_Error *err);
int
dwarf_dieoffset(Dwarf_Die die, Dwarf_Off *ret_offset, Dwarf_Error *err);
int
dwarf_get_cu_die_offset_given_cu_header_offset(Dwarf_Debug dbg, Dwarf_Off in_cu_header_offset, Dwarf_Off *out_cu_die_offset,
Dwarf_Error *err);
int
dwarf_get_cu_die_offset_given_cu_header_offset_b(Dwarf_Debug dbg, Dwarf_Off in_cu_header_offset, Dwarf_Bool is_info,
Dwarf_Off *out_cu_die_offset, Dwarf_Error *err);
DESCRIPTION
These functions are used to retrieve offsets for DWARF debugging information entries.
Function dwarf_die_CU_offset() returns the offset of the debugging information entry referenced by argument die relative to the start of its
containing compilation unit. Argument ret_offset should point to the location that is to hold the returned offset. If argument err is non-
NULL, it will be used to return an error descriptor in case of an error.
Function dwarf_die_CU_offset_range() returns the section-relative offset and length of the compilation unit containing the debugging informa-
tion entry referenced by argument die. Argument cu_offset should point to a location that will hold the returned offset. Argument cu_length
should point to a location that will hold the returned length of the compilation unit. If argument err is non-NULL, it will be used to
return an error descriptor in case of an error.
Function dwarf_dieoffset() retrieves the section-relative offset of the debugging information entry referenced by argument die. Argument
ret_offset should point to a location that is to hold the returned section-relative offset. If argument err is non-NULL, it will be used to
return an error descriptor in case of an error.
Function dwarf_get_cu_die_offset_given_cu_header_offset() returns the offset for the first debugging information entry for a compilation
unit, given an offset to the header of the compilation unit. Argument dbg should reference a valid debugging context allocated using
dwarf_init(3). Argument in_cu_header_offset contains the offset to the start of a compilation unit. Argument out_cu_die_offset points to a
location that will hold the returned offset. If argument err is non-NULL, it will be used to return an error descriptor in case of an error.
Function dwarf_get_cu_die_offset_given_cu_header_offset_b() behaves identically to the function
dwarf_get_cu_die_offset_given_cu_header_offset() when the argument is_info is non-zero. When the argument is_info is zero, function
dwarf_get_cu_die_offset_given_cu_header_offset_b() returns the offset for the first debugging information entry for a type unit, given an
offset to the header of the type unit in argument in_cu_header_offset. Argument out_cu_die_offset points to a location that will hold the
returned offset. If the argument err is non-NULL, it will be used to return an error descriptor in case of an error.
RETURN VALUES
On success, these functions return DW_DLV_OK. In case of an error, these functions return DW_DLV_ERROR and set argument err.
Function dwarf_get_cu_die_offset_given_cu_header_offset() and dwarf_get_cu_die_offset_given_cu_header_offset_b() returns DW_DLV_NO_ENTRY and
sets argument err if there is no compilation or type unit located at the offset specified in argument in_cu_header_offset.
ERRORS
These functions may fail with the following errors:
[DW_DLE_ARGUMENT] One of the arguments cu_length, cu_offset, dbg, die, out_cu_die_offset or ret_offset was NULL.
[DW_DLE_NO_ENTRY] Argument in_cu_header_offset specified an unknown offset.
SEE ALSO
dwarf(3), dwarf_next_cu_header(3), dwarf_offdie(3), dwarf_offdie_b(3)
BSD
December 21, 2014 BSD