def find_compile_unit(off):
txts = dwarfutils.extract_dies_by_offset(args.dwarffile.name,
off,
parents=True)
assert "TAG_compile_unit" in txts[0]
cu_off = dwarfutils.extract_offset(txts[0])
return cu_off
def extract_and_parse_die(off):
if off in DIEs:
print("Using cached {}".format(DIEs[off]), file=sys.stderr)
return
txts = dwarfutils.extract_dies_by_offset(args.dwarffile.name, off)
txt = txts[0]
print(txt, file=sys.stderr)
assert dwarfutils.extract_offset(txt) == off
handlers = {
"TAG_array_type": parse_array_type,
"TAG_base_type": parse_base_type,
"TAG_compile_unit": parse_compile_unit_type,
"TAG_const_type": parse_const_type,
"TAG_enumeration_type": parse_enumeration_type,
"TAG_member": parse_member_type,
"TAG_pointer_type": parse_pointer_type,
"TAG_structure_type": parse_structure_type,
"TAG_subroutine_type": parse_subroutine_type,
"TAG_typedef": parse_typedef,
"TAG_union_type": parse_union_type,
"TAG_variable": parse_variable_type,
"TAG_volatile_type": parse_volatile_type,
}
tag = dwarfutils.extract_tag(txt)
try:
return handlers[tag](txt)
except KeyError:
raise NotImplementedError
def parse_struct(parent_off):
txts = dwarfutils.extract_dies_by_offset(args.dwarffile.name,
parent_off,
children=True)
level = 0
for txt in txts[1:]:
if "TAG_member" in txt:
if level > 0:
# ignore
continue
parse_member_type(txt)
DIEs[parent_off].members.append(dwarfutils.extract_offset(txt))
elif "NULL" in txt:
level -= 1
if level < 0:
return
elif "TAG_union_type" in txt:
if not "AT_declaration" in txt:
level += 1
if level == 0:
parse_union_type(txt)
elif "TAG_structure_type" in txt:
if not "AT_declaration" in txt:
level += 1
if level == 0:
parse_structure_type(txt)
else:
raise NotImplementedError
else:
assert len(txts) == 1 or "AT_declaration" in txts[0]
def _extract_array_count(off):
txts = dwarfutils.extract_dies_by_offset(args.dwarffile.name,
off,
children=True)
assert dwarfutils.extract_tag(txts[0]) == "TAG_array_type"
assert dwarfutils.extract_tag(txts[1]) == "TAG_subrange_type"
try:
count = dwarfutils.extract_count(txts[1])
except AttributeError:
count = -1
return count
def parse_subroutine(parent_off):
txts = dwarfutils.extract_dies_by_offset(args.dwarffile.name,
parent_off,
children=True)
assert dwarfutils.extract_tag(txts[0]) == "TAG_subroutine_type"
for txt in txts[1:]:
if "TAG_formal_parameter" in txt:
off = dwarfutils.extract_offset(txt)
type_off, type_name = dwarfutils.extract_type(txt)
extract_and_parse_die(type_off)
DIEs[off] = DIEFormalParameter(ttype=(type_off, type_name))
DIEs[parent_off].members.append(off)
elif "TAG_unspecified_parameters" in txt:
pass
elif "NULL" in txt:
return
else:
raise NotImplementedError
def parse_enumeration(parent_off):
txts = dwarfutils.extract_dies_by_offset(args.dwarffile.name,
parent_off,
children=True)
assert dwarfutils.extract_tag(txts[0]) == "TAG_enumeration_type"
for txt in txts[1:]:
if "TAG_enumerator" in txt:
off = dwarfutils.extract_offset(txt)
DIEs[off] = DIEEnumerator(
name=dwarfutils.extract_name(txt),
const_value=dwarfutils.extract_const_value(txt))
DIEs[parent_off].members.append(off)
elif "NULL" in txt:
return
else:
raise NotImplementedError
else:
assert "AT_declaration" in txts[0]
#!/usr/bin/env python3
import argparse
import dwarfutils
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument("dwarffile", type=argparse.FileType())
parser.add_argument("symbol")
parser.add_argument("--children", action="store_true")
parser.add_argument("--filter")
args = parser.parse_args()
try:
offset = int(args.symbol, 0)
textdies = dwarfutils.extract_dies_by_offset(args.dwarffile.name,
offset,
children=args.children)
except ValueError:
name = args.symbol
textdies = dwarfutils.extract_dies_by_name(args.dwarffile.name,
name,
children=args.children)
for textdie in textdies:
if not args.filter or args.filter in dwarfutils.extract_tag(textdie):
print(textdie)
print()