added extra description for DW_AT_import to conform with readelf
diff --git a/elftools/dwarf/descriptions.py b/elftools/dwarf/descriptions.py
index 950ff43..6676827 100644
--- a/elftools/dwarf/descriptions.py
+++ b/elftools/dwarf/descriptions.py
@@ -10,6 +10,8 @@
from .constants import *
from .location_expr import LocationExpressionDumper
+from .die import DIE
+from ..common.utils import preserve_stream_pos
def describe_attr_value(attr, die, section_offset):
@@ -224,6 +226,34 @@
return '(' + location_expr_dumper.get_str() + ')'
+def _import_extra(attr, die, section_offset):
+ # For DW_AT_import the value points to a DIE (that can be either in the
+ # current DIE's CU or in another CU, depending on the FORM). The extra
+ # information for it is the abbreviation number in this DIE and its tag.
+ if attr.form == 'DW_FORM_ref_addr':
+ # Absolute offset value
+ ref_die_offset = section_offset + attr.value
+ else:
+ # Relative offset to the current DIE's CU
+ ref_die_offset = attr.value + die.cu.cu_offset
+ #print '&&&', attr.form, attr.value, ref_die_offset, ref_die_offset - section_offset
+
+ # Now find the CU this DIE belongs to (since we have to find its abbrev
+ # table). This is done by linearly scanning through all CUs, looking for
+ # one spanning an address space containing the referred DIE's offset.
+ for cu in die.dwarfinfo.iter_CUs():
+ if cu['unit_length'] + cu.cu_offset > ref_die_offset >= cu.cu_offset:
+ # Once we have the CU, we can actually parse this DIE from the
+ # stream.
+ with preserve_stream_pos(die.stream):
+ ref_die = DIE(cu, die.stream, ref_die_offset)
+ #print '&&& ref_die', ref_die
+ return '[Abbrev Number: %s (%s)]' % (
+ ref_die.abbrev_code, ref_die.tag)
+
+ return '[unknown]'
+
+
_EXTRA_INFO_DESCRIPTION_MAP = defaultdict(
lambda: _make_extra_string(''), # default_factory
@@ -258,6 +288,7 @@
DW_AT_associated=_location_list_extra,
DW_AT_data_location=_location_list_extra,
DW_AT_stride=_location_list_extra,
+ DW_AT_import=_import_extra,
)
