| DWARF_CHILD(3) | Library Functions Manual | DWARF_CHILD(3) |
dwarf_child, dwarf_offdie,
dwarf_offdie_b,
dwarf_siblingof,
dwarf_siblingof_b —
#include <libdwarf.h>
int
dwarf_child(Dwarf_Die
die, Dwarf_Die
*ret_die, Dwarf_Error
*err);
int
dwarf_offdie(Dwarf_Debug dbg,
Dwarf_Off offset, Dwarf_Die
*ret_die, Dwarf_Error *err);
int
dwarf_offdie_b(Dwarf_Debug dbg,
Dwarf_Off offset, Dwarf_Bool
is_info, Dwarf_Die *ret_die,
Dwarf_Error *err);
int
dwarf_siblingof(Dwarf_Debug dbg,
Dwarf_Die die, Dwarf_Die
*ret_die, Dwarf_Error *err);
int
dwarf_siblingof_b(Dwarf_Debug
dbg, Dwarf_Die die, Dwarf_Die
*ret_die, Dwarf_Bool is_info,
Dwarf_Error *err);
Function dwarf_child() retrieves the child
of descriptor denoted by argument die, and stores it
in the location pointed to by argument ret_die.
Function dwarf_siblingof() retrieves the
sibling of the descriptor denoted by argument die, and
stores it in the location pointed to by argument
ret_die. If argument die is
NULL, the first debugging information entry descriptor for the current
compilation unit will be returned. This function and function
dwarf_child() may be used together to traverse the
tree of debugging information entry descriptors for a compilation unit.
Function dwarf_siblingof_b() is identical
to the function dwarf_siblingof() except that it can
retrieve the sibling descriptor from either the current compilation unit or
type unit. If argument is_info is non-zero, the
function behaves identically to function
dwarf_siblingof(). If argument
is_info is zero, the descriptor referred by argument
die should be associated with a debugging information
entry in the type unit. The function will store the sibling of the
descriptor in the location pointed to by argument
ret_die. If argument is_info is
zero and argument die is NULL,
the first debugging information entry descriptor for the current type unit
will be returned.
Function dwarf_offdie() retrieves the
debugging information entry descriptor at global offset
offset in the “.debug_info” section of
the object associated with argument dbg. The returned
descriptor is written to the location pointed to by argument
ret_die.
Function dwarf_offdie_b() is identical to
the function dwarf_offdie() except that it can
retrieve the debugging information entry descriptor at global offset
offset from either of the “.debug_info”
and “.debug_types” sections of the object associated with
argument dbg. If argument
is_info is non-zero, the function will retrieve the
debugging information entry from the “.debug_info” section,
otherwise the function will retrieve the debugging information entry from
the “.debug_types” section. The returned descriptor is written
to the location pointed to by argument ret_die.
dwarf_dealloc() with the
allocation type DW_DLA_DIE to free the memory area
when the Dwarf_Die descriptor is no longer needed.
DW_DLV_OK]DW_DLV_ERROR]DW_DLV_NO_ENTRY]dwarf_child(),
dwarf_siblingof() and
dwarf_siblingof_b(), the descriptor denoted by
argument die did not have a child or sibling.
For functions dwarf_offdie() and
dwarf_offdie_b(), there was no debugging
information entry at the offset specified by argument
offset.
DW_DLE_ARGUMENT]DW_DLE_DIE_NO_CU_CONTEXT]DW_DLE_NO_ENTRY]
Dwarf_Debug dbg;
Dwarf_Die die, die0;
Dwarf_Error de;
... allocate dbg using dwarf_init() etc ...
if (dwarf_next_cu_header(dbg, NULL, NULL, NULL, NULL, NULL, &de) !=
DW_DLV_OK)
errx(EXIT_FAILURE, "dwarf_next_cu_header: %s",
dwarf_errmsg(de));
/* Get the first DIE for the current compilation unit. */
die = NULL;
if (dwarf_siblingof(dbg, die, &die0, &de) != DW_DLV_OK)
errx(EXIT_FAILURE, "dwarf_siblingof: %s", dwarf_errmsg(de));
/* Get the first child of this DIE. */
die = die0;
if (dwarf_child(die, &die0, &de) != DW_DLV_OK)
errx(EXIT_FAILURE, "dwarf_child: %s", dwarf_errmsg(de));
/* Get the rest of children. */
do {
die = die0;
if (dwarf_siblingof(dbg, die, &die0, &de) == DW_DLV_ERROR)
errx(EXIT_FAILURE, "dwarf_siblingof: %s",
dwarf_errmsg(de));
} while (die0 != NULL);
| December 21, 2014 | NetBSD 9.2 |