| DWARF_GET_RANGES(3) | Library Functions Manual | DWARF_GET_RANGES(3) |
dwarf_get_ranges —
#include <libdwarf.h>
int
dwarf_get_ranges(Dwarf_Debug
dbg, Dwarf_Off offset,
Dwarf_Ranges **ranges, Dwarf_Signed
*cnt, Dwarf_Unsigned *byte_cnt,
Dwarf_Error *err);
int
dwarf_get_ranges_a(Dwarf_Debug
dbg, Dwarf_Off offset, Dwarf_Die
die, Dwarf_Ranges **ranges,
Dwarf_Signed *cnt, Dwarf_Unsigned
*byte_cnt, Dwarf_Error *err);
dwarf_get_ranges() retrieves information about
the non-contiguous address ranges associated with a DWARF debugging
information entry. Information about address ranges is returned as an array of
descriptors of type Dwarf_Ranges, with each
Dwarf_Ranges descriptor describing one address range
entry.
Argument dbg should reference a DWARF debug context allocated using dwarf_init(3).
Argument offset is an offset, relative to
the “.debug_ranges” section, to the start of the desired list
of address ranges. The offset of an address ranges list is indicated by the
DW_AT_ranges attribute of a debugging information
entry.
Argument die (function
dwarf_get_ranges_a() only) is ignored in this
implementation; see the section
Compatibility Notes below.
Argument ranges should point to a location that will be set to a pointer to an array of Dwarf_Ranges descriptors.
Argument cnt should point to a location that will be set to the number of entries returned. If argument byte_cnt is not NULL, it will be set to the number of bytes occupied by the returned entries in the “.debug_ranges” section.
If argument err is not NULL, it will be used to store error information in case of an error.
Dwarf_Ranges descriptors are defined in the
header file <libdwarf.h>,
and consists of the following fields:
DW_RANGES_ENTRYDW_RANGES_ADDRESS_SELECTIONDW_RANGES_ENDdwarf_ranges_dealloc() to indicate
that the memory may be freed.
dwarf_get_ranges_a() is identical to
dwarf_get_ranges(), except that it requires one
additional argument die denoting the debugging
information entry associated with the address range list. In this
implementation of the DWARF Access Library (libdwarf,
-ldwarf), the argument die is ignored, and
function dwarf_get_ranges_a() is only provided for
compatibility with other implementations of the DWARF(3) API.
DW_DLV_OK when they succeed. They
return DW_DLV_NO_ENTRY if there is no address range
list at the specified offset offset. In case of an
error, they return DW_DLV_ERROR and set the argument
err.
DW_DLE_ARGUMENT]DW_DLE_NO_ENTRY]
Dwarf_Debug dbg;
Dwarf_Die die;
Dwarf_Error de;
Dwarf_Addr base;
Dwarf_Attribute *attr_list;
Dwarf_Ranges *ranges;
Dwarf_Signed cnt;
Dwarf_Unsigned off, attr_count, bytecnt;
int i, j;
if ((ret = dwarf_attrlist(die, &attr_list, &attr_count, &de)) !=
DW_DLV_OK)
errx(EXIT_FAILURE, "dwarf_attrlist failed: %s",
dwarf_errmsg(de));
for (i = 0; (Dwarf_Unsigned) i < attr_count; i++) {
if (dwarf_whatattr(attr_list[i], &attr, &de) != DW_DLV_OK) {
warnx("dwarf_whatattr failed: %s",
dwarf_errmsg(de));
continue;
}
if (attr != DW_AT_ranges)
continue;
if (dwarf_formudata(attr_list[i], &off, &de) != DW_DLV_OK) {
warnx("dwarf_formudata failed: %s",
dwarf_errmsg(de));
continue;
}
if (dwarf_get_ranges(dbg, (Dwarf_Off) off, &ranges, &cnt,
&bytecnt, &de) != DW_DLV_OK)
continue;
for (j = 0; j < cnt; j++) {
if (ranges[j].dwr_type == DW_RANGES_END)
break;
else if (ranges[j].dwr_type ==
DW_RANGES_ADDRESS_SELECTION)
base = ranges[j].dwr_addr2;
else {
/*
* DW_RANGES_ENTRY entry.
* .. Use dwr_addr1 and dwr_addr2 ..
*/
}
}
}
| November 9, 2011 | NetBSD 9.3 |