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 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 parse_typedef(txt):
off = dwarfutils.extract_offset(txt)
name = dwarfutils.extract_name(txt)
if "__builtin_va_list" in name:
name = name.upper()
type_off, type_name = dwarfutils.extract_type(txt)
extract_and_parse_die(type_off)
DIEs[off] = DIETypedef(name=name, ttype=(type_off, type_name))
def parse_enumeration_type(txt):
off = dwarfutils.extract_offset(txt)
try:
name = dwarfutils.extract_name(txt)
except AttributeError:
name = None
DIEs[off] = DIEEnumeration(name=name, members=list())
parse_enumeration(off)
def parse_const_type(txt):
off = dwarfutils.extract_offset(txt)
try:
type_off, type_name = dwarfutils.extract_type(txt)
except AttributeError:
type_off, type_name = None, None
else:
extract_and_parse_die(type_off)
DIEs[off] = DIEConst(ttype=(type_off, type_name))
def parse_union_type(txt):
off = dwarfutils.extract_offset(txt)
try:
name = dwarfutils.extract_name(txt)
except AttributeError:
name = None
byte_size = dwarfutils.extract_byte_size(txt)
DIEs[off] = DIEUnion(name=name, byte_size=byte_size, members=list())
parse_union(off)
def parse_subroutine_type(txt):
off = dwarfutils.extract_offset(txt)
try:
type_off, type_name = dwarfutils.extract_type(txt)
except AttributeError:
type_off, type_name = None, "void"
else:
extract_and_parse_die(type_off)
DIEs[off] = DIESubroutine(ttype=(type_off, type_name), members=list())
parse_subroutine(off)
def parse_structure_type(txt):
off = dwarfutils.extract_offset(txt)
try:
name = dwarfutils.extract_name(txt)
except AttributeError:
name = None
try:
byte_size = dwarfutils.extract_byte_size(txt)
except AttributeError:
assert "AT_declaration" in txt
byte_size = -1
DIEs[off] = DIEStructure(name=name, byte_size=byte_size, members=list())
parse_struct(off)
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]
def parse_member_type(txt):
off = dwarfutils.extract_offset(txt)
try:
name = dwarfutils.extract_name(txt)
except AttributeError:
name = None
type_off, type_name = dwarfutils.extract_type(txt)
extract_and_parse_die(type_off)
try:
location = dwarfutils.extract_location(txt)
except AttributeError:
try:
location = dwarfutils.extract_bit_location(txt)
except AttributeError:
location = -1
try:
bit_size = dwarfutils.extract_bit_size(txt)
except AttributeError:
bit_size = -1
DIEs[off] = DIEMember(name=name,
ttype=(type_off, type_name),
location=location,
bit_size=bit_size)
def parse_variable_type(txt):
off = dwarfutils.extract_offset(txt)
name = dwarfutils.extract_name(txt)
type_off, type_name = dwarfutils.extract_type(txt)
extract_and_parse_die(type_off)
DIEs[off] = DIEVariable(name=name, ttype=(type_off, type_name))
def parse_compile_unit_type(txt):
off = dwarfutils.extract_offset(txt)
DIEs[off] = DIECompileUnit(name=dwarfutils.extract_name(txt))
def parse_base_type(txt):
off = dwarfutils.extract_offset(txt)
DIEs[off] = DIEBase(name=dwarfutils.extract_name(txt),
byte_size=dwarfutils.extract_byte_size(txt))
def parse_array_type(txt):
off = dwarfutils.extract_offset(txt)
type_off, type_name = dwarfutils.extract_type(txt)
extract_and_parse_die(type_off)
DIEs[off] = DIEArray(ttype=(type_off, type_name),
size=_extract_array_count(off))
def parse_volatile_type(txt):
off = dwarfutils.extract_offset(txt)
type_off, type_name = dwarfutils.extract_type(txt)
extract_and_parse_die(type_off)
DIEs[off] = DIEVolatile(ttype=(type_off, type_name))
