def visit_structure_type(die,dies_dict):
# enumerate members of structure or union
type_info = {
'kind': DW_TAG[die.tag],
'byte_size': get_int(die, 'byte_size')
}
members = []
for child in die.children:
name = get_str(child, 'name')
member_info = {
'name': name
}
# handle union as "structure with all fields at offset 0"
offset = 0
if 'data_member_location' in child.attr_dict:
expr = child.attr_dict['data_member_location'].value
assert(expr.instructions[0].opcode == DW_OP.plus_uconst)
offset = expr.instructions[0].operand_1
member_info['offset'] = offset
type = dies_dict.get(get_ref(child, 'type'))
(type,indirection) = parse_type(type, dies_dict)
member_info['indirection'] = indirection
member_info['type'] = type_name(type)
members.append(member_info)
if DEBUG:
print(member_info)
worklist.append(type)
type_info['members'] = members
return type_info
def parse_type(type, dies_dict):
'''
Parse type by removing modifiers and counting pointer
indirections.
'''
indirection = 0
while type is not None and type.tag in [DW_TAG.const_type, DW_TAG.volatile_type, DW_TAG.typedef, DW_TAG.pointer_type]:
if type.tag == DW_TAG.pointer_type:
indirection += 1
type = dies_dict.get(get_ref(type, 'type'), None)
return (type, indirection)
def parse_type(type, dies_dict):
'''
Parse type by removing modifiers and counting pointer
indirections.
'''
indirection = 0
while type is not None and type.tag in [DW_TAG.const_type, DW_TAG.volatile_type, DW_TAG.typedef, DW_TAG.pointer_type]:
if type.tag == DW_TAG.pointer_type:
indirection += 1
type = dies_dict.get(get_ref(type, 'type'), None)
return (type, indirection)
def visit_array_type(die,dies_dict):
type = dies_dict.get(get_ref(die, 'type'))
(type,indirection) = parse_type(type, dies_dict)
type_info = {
'kind': 'array_type',
'indirection': indirection,
'type': type_name(type),
'length': None
}
for child in die.children:
if child.tag != DW_TAG.subrange_type:
continue
upper_bound = get_int(child, 'upper_bound')
if upper_bound is not None:
type_info['length'] = upper_bound + 1
if DEBUG:
print(type_info)
return type_info
def visit_array_type(die,dies_dict):
type = dies_dict.get(get_ref(die, 'type'))
(type,indirection) = parse_type(type, dies_dict)
type_info = {
'kind': 'array_type',
'indirection': indirection,
'type': type_name(type),
'length': None
}
for child in die.children:
if child.tag != DW_TAG.subrange_type:
continue
upper_bound = get_int(child, 'upper_bound')
if upper_bound is not None:
type_info['length'] = upper_bound + 1
if DEBUG:
print(type_info)
return type_info
def get_type_ref(die, attr):
'''
Get type ref for a type attribute.
A type ref is a function that, given a name, constructs a syntax tree
for referring to that type.
'''
type_ = get_ref(die, 'type')
if DEBUG:
print (die.offset, "->", type_)
if type_ is None:
ref = base_type_ref('void')
else:
ref = names.get(type_)
if ref is None:
#ref = base_type_ref('unknown_%i' % type_)
ref = to_c_process(by_offset[type_], by_offset, names, rv, written, preref=True)
elif ref is ERROR:
raise ValueError("Unexpected recursion")
return ref
def get_type_ref(die, attr):
'''
Get type ref for a type attribute.
A type ref is a function that, given a name, constructs a syntax tree
for referring to that type.
'''
type_ = get_ref(die, 'type')
if DEBUG:
print(die.offset, "->", type_)
if type_ is None:
ref = base_type_ref('void')
else:
ref = names.get(type_)
if ref is None:
#ref = base_type_ref('unknown_%i' % type_)
ref = to_c_process(by_offset[type_],
by_offset,
names,
rv,
written,
preref=True)
elif ref is ERROR:
raise ValueError("Unexpected recursion")
return ref
def get_ref_lookup(die, attr, by_offset):
'''Get referenced die'''
try:
return by_offset[get_ref(die, attr)]
except KeyError:
return None