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coredump: add containerof() to CoredumpObject

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This commit is contained in:
Omar Sandoval 2018-03-07 21:07:19 -08:00
parent 16b3e672e1
commit c625845a62
1 changed files with 13 additions and 3 deletions
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16
drgn/coredump.py
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@ -43,8 +43,7 @@ class CoredumpObject:
def _member(self, name):
if isinstance(self._real_type, PointerType):
buffer = self._coredump.read(self._address, self._real_type.sizeof())
address = self._real_type.read(buffer)
address = self._value()
type_ = self._real_type.type
else:
address = self._address
@ -62,6 +61,18 @@ class CoredumpObject:
raise ValueError('type must be Type, TypeName, or string')
return CoredumpObject(self._coredump, self._address, type)
def _containerof(self, type, member):
if isinstance(type, TypeName):
type = self._coredump._type_factory.from_type_name(type)
elif isinstance(type, str):
type = self._coredump._type_factory.from_type_string(type)
elif not isinstance(type, Type):
raise ValueError('type must be Type, TypeName, or string')
if not isinstance(self._real_type, PointerType):
raise ValueError('containerof is only valid on pointers')
address = self._value() - type.offsetof(member)
return CoredumpObject(self._coredump, address, type)
def __getitem__(self, item):
if isinstance(self._real_type, PointerType):
buffer = self._coredump.read(self._address, self._real_type.sizeof())
@ -102,7 +113,6 @@ class Coredump:
return os.pread(self._core_file.fileno(), size,
phdr.p_offset + address - phdr.p_vaddr)
def __getitem__(self, key):
address = self.symbols[key][-1].address
dwarf_type = self._dwarf_index.find_variable(key).type()