1393 lines
44 KiB
Python
1393 lines
44 KiB
Python
#!/usr/bin/python
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'''
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From gdb 7 onwards, gdb's build can be configured --with-python, allowing gdb
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to be extended with Python code e.g. for library-specific data visualizations,
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such as for the C++ STL types. Documentation on this API can be seen at:
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http://sourceware.org/gdb/current/onlinedocs/gdb/Python-API.html
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This python module deals with the case when the process being debugged (the
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"inferior process" in gdb parlance) is itself python, or more specifically,
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linked against libpython. In this situation, almost every item of data is a
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(PyObject*), and having the debugger merely print their addresses is not very
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enlightening.
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This module embeds knowledge about the implementation details of libpython so
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that we can emit useful visualizations e.g. a string, a list, a dict, a frame
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giving file/line information and the state of local variables
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In particular, given a gdb.Value corresponding to a PyObject* in the inferior
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process, we can generate a "proxy value" within the gdb process. For example,
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given a PyObject* in the inferior process that is in fact a PyListObject*
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holding three PyObject* that turn out to be PyStringObject* instances, we can
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generate a proxy value within the gdb process that is a list of strings:
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["foo", "bar", "baz"]
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Doing so can be expensive for complicated graphs of objects, and could take
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some time, so we also have a "write_repr" method that writes a representation
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of the data to a file-like object. This allows us to stop the traversal by
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having the file-like object raise an exception if it gets too much data.
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With both "proxyval" and "write_repr" we keep track of the set of all addresses
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visited so far in the traversal, to avoid infinite recursion due to cycles in
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the graph of object references.
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We try to defer gdb.lookup_type() invocations for python types until as late as
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possible: for a dynamically linked python binary, when the process starts in
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the debugger, the libpython.so hasn't been dynamically loaded yet, so none of
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the type names are known to the debugger
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The module also extends gdb with some python-specific commands.
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'''
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import gdb
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# Look up the gdb.Type for some standard types:
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_type_char_ptr = gdb.lookup_type('char').pointer() # char*
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_type_unsigned_char_ptr = gdb.lookup_type('unsigned char').pointer() # unsigned char*
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_type_void_ptr = gdb.lookup_type('void').pointer() # void*
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_type_size_t = gdb.lookup_type('size_t')
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SIZEOF_VOID_P = _type_void_ptr.sizeof
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Py_TPFLAGS_HEAPTYPE = (1L << 9)
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Py_TPFLAGS_INT_SUBCLASS = (1L << 23)
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Py_TPFLAGS_LONG_SUBCLASS = (1L << 24)
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Py_TPFLAGS_LIST_SUBCLASS = (1L << 25)
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Py_TPFLAGS_TUPLE_SUBCLASS = (1L << 26)
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Py_TPFLAGS_STRING_SUBCLASS = (1L << 27)
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Py_TPFLAGS_UNICODE_SUBCLASS = (1L << 28)
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Py_TPFLAGS_DICT_SUBCLASS = (1L << 29)
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Py_TPFLAGS_BASE_EXC_SUBCLASS = (1L << 30)
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Py_TPFLAGS_TYPE_SUBCLASS = (1L << 31)
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MAX_OUTPUT_LEN=1024
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class NullPyObjectPtr(RuntimeError):
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pass
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def safety_limit(val):
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# Given a integer value from the process being debugged, limit it to some
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# safety threshold so that arbitrary breakage within said process doesn't
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# break the gdb process too much (e.g. sizes of iterations, sizes of lists)
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return min(val, 1000)
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def safe_range(val):
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# As per range, but don't trust the value too much: cap it to a safety
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# threshold in case the data was corrupted
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return xrange(safety_limit(val))
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class StringTruncated(RuntimeError):
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pass
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class TruncatedStringIO(object):
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'''Similar to cStringIO, but can truncate the output by raising a
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StringTruncated exception'''
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def __init__(self, maxlen=None):
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self._val = ''
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self.maxlen = maxlen
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def write(self, data):
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if self.maxlen:
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if len(data) + len(self._val) > self.maxlen:
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# Truncation:
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self._val += data[0:self.maxlen - len(self._val)]
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raise StringTruncated()
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self._val += data
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def getvalue(self):
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return self._val
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class PyObjectPtr(object):
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"""
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Class wrapping a gdb.Value that's a either a (PyObject*) within the
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inferior process, or some subclass pointer e.g. (PyStringObject*)
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There will be a subclass for every refined PyObject type that we care
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about.
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Note that at every stage the underlying pointer could be NULL, point
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to corrupt data, etc; this is the debugger, after all.
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"""
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_typename = 'PyObject'
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def __init__(self, gdbval, cast_to=None):
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if cast_to:
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self._gdbval = gdbval.cast(cast_to)
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else:
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self._gdbval = gdbval
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def field(self, name):
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'''
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Get the gdb.Value for the given field within the PyObject, coping with
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some python 2 versus python 3 differences.
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Various libpython types are defined using the "PyObject_HEAD" and
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"PyObject_VAR_HEAD" macros.
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In Python 2, this these are defined so that "ob_type" and (for a var
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object) "ob_size" are fields of the type in question.
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In Python 3, this is defined as an embedded PyVarObject type thus:
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PyVarObject ob_base;
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so that the "ob_size" field is located insize the "ob_base" field, and
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the "ob_type" is most easily accessed by casting back to a (PyObject*).
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'''
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if self.is_null():
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raise NullPyObjectPtr(self)
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if name == 'ob_type':
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pyo_ptr = self._gdbval.cast(PyObjectPtr.get_gdb_type())
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return pyo_ptr.dereference()[name]
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if name == 'ob_size':
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try:
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# Python 2:
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return self._gdbval.dereference()[name]
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except RuntimeError:
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# Python 3:
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return self._gdbval.dereference()['ob_base'][name]
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# General case: look it up inside the object:
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return self._gdbval.dereference()[name]
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def pyop_field(self, name):
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'''
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Get a PyObjectPtr for the given PyObject* field within this PyObject,
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coping with some python 2 versus python 3 differences.
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'''
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return PyObjectPtr.from_pyobject_ptr(self.field(name))
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def write_field_repr(self, name, out, visited):
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'''
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Extract the PyObject* field named "name", and write its representation
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to file-like object "out"
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'''
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field_obj = self.pyop_field(name)
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field_obj.write_repr(out, visited)
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def get_truncated_repr(self, maxlen):
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'''
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Get a repr-like string for the data, but truncate it at "maxlen" bytes
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(ending the object graph traversal as soon as you do)
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'''
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out = TruncatedStringIO(maxlen)
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try:
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self.write_repr(out, set())
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except StringTruncated:
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# Truncation occurred:
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return out.getvalue() + '...(truncated)'
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# No truncation occurred:
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return out.getvalue()
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def type(self):
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return PyTypeObjectPtr(self.field('ob_type'))
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def is_null(self):
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return 0 == long(self._gdbval)
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def is_optimized_out(self):
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'''
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Is the value of the underlying PyObject* visible to the debugger?
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This can vary with the precise version of the compiler used to build
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Python, and the precise version of gdb.
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See e.g. https://bugzilla.redhat.com/show_bug.cgi?id=556975 with
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PyEval_EvalFrameEx's "f"
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'''
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return self._gdbval.is_optimized_out
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def safe_tp_name(self):
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try:
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return self.type().field('tp_name').string()
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except NullPyObjectPtr:
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# NULL tp_name?
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return 'unknown'
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except RuntimeError:
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# Can't even read the object at all?
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return 'unknown'
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def proxyval(self, visited):
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'''
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Scrape a value from the inferior process, and try to represent it
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within the gdb process, whilst (hopefully) avoiding crashes when
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the remote data is corrupt.
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Derived classes will override this.
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For example, a PyIntObject* with ob_ival 42 in the inferior process
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should result in an int(42) in this process.
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visited: a set of all gdb.Value pyobject pointers already visited
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whilst generating this value (to guard against infinite recursion when
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visiting object graphs with loops). Analogous to Py_ReprEnter and
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Py_ReprLeave
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'''
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class FakeRepr(object):
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"""
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Class representing a non-descript PyObject* value in the inferior
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process for when we don't have a custom scraper, intended to have
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a sane repr().
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"""
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def __init__(self, tp_name, address):
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self.tp_name = tp_name
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self.address = address
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def __repr__(self):
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# For the NULL pointer, we have no way of knowing a type, so
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# special-case it as per
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# http://bugs.python.org/issue8032#msg100882
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if self.address == 0:
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return '0x0'
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return '<%s at remote 0x%x>' % (self.tp_name, self.address)
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return FakeRepr(self.safe_tp_name(),
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long(self._gdbval))
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def write_repr(self, out, visited):
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'''
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Write a string representation of the value scraped from the inferior
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process to "out", a file-like object.
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'''
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# Default implementation: generate a proxy value and write its repr
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# However, this could involve a lot of work for complicated objects,
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# so for derived classes we specialize this
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return out.write(repr(self.proxyval(visited)))
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@classmethod
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def subclass_from_type(cls, t):
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'''
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Given a PyTypeObjectPtr instance wrapping a gdb.Value that's a
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(PyTypeObject*), determine the corresponding subclass of PyObjectPtr
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to use
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Ideally, we would look up the symbols for the global types, but that
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isn't working yet:
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(gdb) python print gdb.lookup_symbol('PyList_Type')[0].value
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Traceback (most recent call last):
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File "<string>", line 1, in <module>
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NotImplementedError: Symbol type not yet supported in Python scripts.
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Error while executing Python code.
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For now, we use tp_flags, after doing some string comparisons on the
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tp_name for some special-cases that don't seem to be visible through
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flags
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'''
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try:
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tp_name = t.field('tp_name').string()
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tp_flags = int(t.field('tp_flags'))
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except RuntimeError:
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# Handle any kind of error e.g. NULL ptrs by simply using the base
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# class
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return cls
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#print 'tp_flags = 0x%08x' % tp_flags
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#print 'tp_name = %r' % tp_name
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name_map = {'bool': PyBoolObjectPtr,
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'classobj': PyClassObjectPtr,
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'instance': PyInstanceObjectPtr,
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'NoneType': PyNoneStructPtr,
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'frame': PyFrameObjectPtr,
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'set' : PySetObjectPtr,
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'frozenset' : PySetObjectPtr,
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'builtin_function_or_method' : PyCFunctionObjectPtr,
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}
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if tp_name in name_map:
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return name_map[tp_name]
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if tp_flags & Py_TPFLAGS_HEAPTYPE:
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return HeapTypeObjectPtr
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if tp_flags & Py_TPFLAGS_INT_SUBCLASS:
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return PyIntObjectPtr
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if tp_flags & Py_TPFLAGS_LONG_SUBCLASS:
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return PyLongObjectPtr
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if tp_flags & Py_TPFLAGS_LIST_SUBCLASS:
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return PyListObjectPtr
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if tp_flags & Py_TPFLAGS_TUPLE_SUBCLASS:
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return PyTupleObjectPtr
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if tp_flags & Py_TPFLAGS_STRING_SUBCLASS:
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return PyStringObjectPtr
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if tp_flags & Py_TPFLAGS_UNICODE_SUBCLASS:
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return PyUnicodeObjectPtr
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if tp_flags & Py_TPFLAGS_DICT_SUBCLASS:
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return PyDictObjectPtr
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if tp_flags & Py_TPFLAGS_BASE_EXC_SUBCLASS:
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return PyBaseExceptionObjectPtr
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#if tp_flags & Py_TPFLAGS_TYPE_SUBCLASS:
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# return PyTypeObjectPtr
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# Use the base class:
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return cls
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@classmethod
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def from_pyobject_ptr(cls, gdbval):
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'''
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Try to locate the appropriate derived class dynamically, and cast
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the pointer accordingly.
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'''
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try:
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p = PyObjectPtr(gdbval)
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cls = cls.subclass_from_type(p.type())
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return cls(gdbval, cast_to=cls.get_gdb_type())
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except RuntimeError:
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# Handle any kind of error e.g. NULL ptrs by simply using the base
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# class
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pass
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return cls(gdbval)
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@classmethod
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def get_gdb_type(cls):
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return gdb.lookup_type(cls._typename).pointer()
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def as_address(self):
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return long(self._gdbval)
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class ProxyAlreadyVisited(object):
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'''
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Placeholder proxy to use when protecting against infinite recursion due to
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loops in the object graph.
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Analogous to the values emitted by the users of Py_ReprEnter and Py_ReprLeave
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'''
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def __init__(self, rep):
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self._rep = rep
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def __repr__(self):
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return self._rep
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def _write_instance_repr(out, visited, name, pyop_attrdict, address):
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'''Shared code for use by old-style and new-style classes:
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write a representation to file-like object "out"'''
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out.write('<')
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out.write(name)
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# Write dictionary of instance attributes:
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if isinstance(pyop_attrdict, PyDictObjectPtr):
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out.write('(')
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first = True
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for pyop_arg, pyop_val in pyop_attrdict.iteritems():
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if not first:
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out.write(', ')
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first = False
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out.write(pyop_arg.proxyval(visited))
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out.write('=')
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pyop_val.write_repr(out, visited)
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out.write(')')
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out.write(' at remote 0x%x>' % address)
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class InstanceProxy(object):
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def __init__(self, cl_name, attrdict, address):
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self.cl_name = cl_name
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self.attrdict = attrdict
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self.address = address
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def __repr__(self):
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if isinstance(self.attrdict, dict):
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kwargs = ', '.join(["%s=%r" % (arg, val)
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for arg, val in self.attrdict.iteritems()])
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return '<%s(%s) at remote 0x%x>' % (self.cl_name,
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kwargs, self.address)
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else:
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return '<%s at remote 0x%x>' % (self.cl_name,
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self.address)
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def _PyObject_VAR_SIZE(typeobj, nitems):
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return ( ( typeobj.field('tp_basicsize') +
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nitems * typeobj.field('tp_itemsize') +
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(SIZEOF_VOID_P - 1)
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) & ~(SIZEOF_VOID_P - 1)
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).cast(_type_size_t)
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class HeapTypeObjectPtr(PyObjectPtr):
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_typename = 'PyObject'
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def get_attr_dict(self):
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'''
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Get the PyDictObject ptr representing the attribute dictionary
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(or None if there's a problem)
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'''
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try:
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typeobj = self.type()
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dictoffset = int_from_int(typeobj.field('tp_dictoffset'))
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if dictoffset != 0:
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if dictoffset < 0:
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type_PyVarObject_ptr = gdb.lookup_type('PyVarObject').pointer()
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tsize = int_from_int(self._gdbval.cast(type_PyVarObject_ptr)['ob_size'])
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if tsize < 0:
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tsize = -tsize
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size = _PyObject_VAR_SIZE(typeobj, tsize)
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dictoffset += size
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assert dictoffset > 0
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assert dictoffset % SIZEOF_VOID_P == 0
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dictptr = self._gdbval.cast(_type_char_ptr) + dictoffset
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PyObjectPtrPtr = PyObjectPtr.get_gdb_type().pointer()
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dictptr = dictptr.cast(PyObjectPtrPtr)
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return PyObjectPtr.from_pyobject_ptr(dictptr.dereference())
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except RuntimeError:
|
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# Corrupt data somewhere; fail safe
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pass
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# Not found, or some kind of error:
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return None
|
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|
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def proxyval(self, visited):
|
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'''
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Support for new-style classes.
|
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Currently we just locate the dictionary using a transliteration to
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python of _PyObject_GetDictPtr, ignoring descriptors
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'''
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# Guard against infinite loops:
|
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if self.as_address() in visited:
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return ProxyAlreadyVisited('<...>')
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visited.add(self.as_address())
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pyop_attr_dict = self.get_attr_dict()
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if pyop_attr_dict:
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attr_dict = pyop_attr_dict.proxyval(visited)
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else:
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attr_dict = {}
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tp_name = self.safe_tp_name()
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# New-style class:
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return InstanceProxy(tp_name, attr_dict, long(self._gdbval))
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def write_repr(self, out, visited):
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# Guard against infinite loops:
|
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if self.as_address() in visited:
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out.write('<...>')
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return
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visited.add(self.as_address())
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pyop_attrdict = self.get_attr_dict()
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_write_instance_repr(out, visited,
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self.safe_tp_name(), pyop_attrdict, self.as_address())
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|
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class ProxyException(Exception):
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def __init__(self, tp_name, args):
|
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self.tp_name = tp_name
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self.args = args
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|
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def __repr__(self):
|
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return '%s%r' % (self.tp_name, self.args)
|
|
|
|
class PyBaseExceptionObjectPtr(PyObjectPtr):
|
|
"""
|
|
Class wrapping a gdb.Value that's a PyBaseExceptionObject* i.e. an exception
|
|
within the process being debugged.
|
|
"""
|
|
_typename = 'PyBaseExceptionObject'
|
|
|
|
def proxyval(self, visited):
|
|
# Guard against infinite loops:
|
|
if self.as_address() in visited:
|
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return ProxyAlreadyVisited('(...)')
|
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visited.add(self.as_address())
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arg_proxy = self.pyop_field('args').proxyval(visited)
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return ProxyException(self.safe_tp_name(),
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arg_proxy)
|
|
|
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def write_repr(self, out, visited):
|
|
# Guard against infinite loops:
|
|
if self.as_address() in visited:
|
|
out.write('(...)')
|
|
return
|
|
visited.add(self.as_address())
|
|
|
|
out.write(self.safe_tp_name())
|
|
self.write_field_repr('args', out, visited)
|
|
|
|
class PyBoolObjectPtr(PyObjectPtr):
|
|
"""
|
|
Class wrapping a gdb.Value that's a PyBoolObject* i.e. one of the two
|
|
<bool> instances (Py_True/Py_False) within the process being debugged.
|
|
"""
|
|
_typename = 'PyBoolObject'
|
|
|
|
def proxyval(self, visited):
|
|
if int_from_int(self.field('ob_ival')):
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
|
|
class PyClassObjectPtr(PyObjectPtr):
|
|
"""
|
|
Class wrapping a gdb.Value that's a PyClassObject* i.e. a <classobj>
|
|
instance within the process being debugged.
|
|
"""
|
|
_typename = 'PyClassObject'
|
|
|
|
|
|
class BuiltInFunctionProxy(object):
|
|
def __init__(self, ml_name):
|
|
self.ml_name = ml_name
|
|
|
|
def __repr__(self):
|
|
return "<built-in function %s>" % self.ml_name
|
|
|
|
class BuiltInMethodProxy(object):
|
|
def __init__(self, ml_name, pyop_m_self):
|
|
self.ml_name = ml_name
|
|
self.pyop_m_self = pyop_m_self
|
|
|
|
def __repr__(self):
|
|
return ('<built-in method %s of %s object at remote 0x%x>'
|
|
% (self.ml_name,
|
|
self.pyop_m_self.safe_tp_name(),
|
|
self.pyop_m_self.as_address())
|
|
)
|
|
|
|
class PyCFunctionObjectPtr(PyObjectPtr):
|
|
"""
|
|
Class wrapping a gdb.Value that's a PyCFunctionObject*
|
|
(see Include/methodobject.h and Objects/methodobject.c)
|
|
"""
|
|
_typename = 'PyCFunctionObject'
|
|
|
|
def proxyval(self, visited):
|
|
m_ml = self.field('m_ml') # m_ml is a (PyMethodDef*)
|
|
ml_name = m_ml['ml_name'].string()
|
|
|
|
pyop_m_self = self.pyop_field('m_self')
|
|
if pyop_m_self.is_null():
|
|
return BuiltInFunctionProxy(ml_name)
|
|
else:
|
|
return BuiltInMethodProxy(ml_name, pyop_m_self)
|
|
|
|
|
|
class PyCodeObjectPtr(PyObjectPtr):
|
|
"""
|
|
Class wrapping a gdb.Value that's a PyCodeObject* i.e. a <code> instance
|
|
within the process being debugged.
|
|
"""
|
|
_typename = 'PyCodeObject'
|
|
|
|
def addr2line(self, addrq):
|
|
'''
|
|
Get the line number for a given bytecode offset
|
|
|
|
Analogous to PyCode_Addr2Line; translated from pseudocode in
|
|
Objects/lnotab_notes.txt
|
|
'''
|
|
co_lnotab = self.pyop_field('co_lnotab').proxyval(set())
|
|
|
|
# Initialize lineno to co_firstlineno as per PyCode_Addr2Line
|
|
# not 0, as lnotab_notes.txt has it:
|
|
lineno = int_from_int(self.field('co_firstlineno'))
|
|
|
|
addr = 0
|
|
for addr_incr, line_incr in zip(co_lnotab[::2], co_lnotab[1::2]):
|
|
addr += ord(addr_incr)
|
|
if addr > addrq:
|
|
return lineno
|
|
lineno += ord(line_incr)
|
|
return lineno
|
|
|
|
|
|
class PyDictObjectPtr(PyObjectPtr):
|
|
"""
|
|
Class wrapping a gdb.Value that's a PyDictObject* i.e. a dict instance
|
|
within the process being debugged.
|
|
"""
|
|
_typename = 'PyDictObject'
|
|
|
|
def iteritems(self):
|
|
'''
|
|
Yields a sequence of (PyObjectPtr key, PyObjectPtr value) pairs,
|
|
analagous to dict.iteritems()
|
|
'''
|
|
for i in safe_range(self.field('ma_mask') + 1):
|
|
ep = self.field('ma_table') + i
|
|
pyop_value = PyObjectPtr.from_pyobject_ptr(ep['me_value'])
|
|
if not pyop_value.is_null():
|
|
pyop_key = PyObjectPtr.from_pyobject_ptr(ep['me_key'])
|
|
yield (pyop_key, pyop_value)
|
|
|
|
def proxyval(self, visited):
|
|
# Guard against infinite loops:
|
|
if self.as_address() in visited:
|
|
return ProxyAlreadyVisited('{...}')
|
|
visited.add(self.as_address())
|
|
|
|
result = {}
|
|
for pyop_key, pyop_value in self.iteritems():
|
|
proxy_key = pyop_key.proxyval(visited)
|
|
proxy_value = pyop_value.proxyval(visited)
|
|
result[proxy_key] = proxy_value
|
|
return result
|
|
|
|
def write_repr(self, out, visited):
|
|
# Guard against infinite loops:
|
|
if self.as_address() in visited:
|
|
out.write('{...}')
|
|
return
|
|
visited.add(self.as_address())
|
|
|
|
out.write('{')
|
|
first = True
|
|
for pyop_key, pyop_value in self.iteritems():
|
|
if not first:
|
|
out.write(', ')
|
|
first = False
|
|
pyop_key.write_repr(out, visited)
|
|
out.write(': ')
|
|
pyop_value.write_repr(out, visited)
|
|
out.write('}')
|
|
|
|
class PyInstanceObjectPtr(PyObjectPtr):
|
|
_typename = 'PyInstanceObject'
|
|
|
|
def proxyval(self, visited):
|
|
# Guard against infinite loops:
|
|
if self.as_address() in visited:
|
|
return ProxyAlreadyVisited('<...>')
|
|
visited.add(self.as_address())
|
|
|
|
# Get name of class:
|
|
in_class = self.pyop_field('in_class')
|
|
cl_name = in_class.pyop_field('cl_name').proxyval(visited)
|
|
|
|
# Get dictionary of instance attributes:
|
|
in_dict = self.pyop_field('in_dict').proxyval(visited)
|
|
|
|
# Old-style class:
|
|
return InstanceProxy(cl_name, in_dict, long(self._gdbval))
|
|
|
|
def write_repr(self, out, visited):
|
|
# Guard against infinite loops:
|
|
if self.as_address() in visited:
|
|
out.write('<...>')
|
|
return
|
|
visited.add(self.as_address())
|
|
|
|
# Old-style class:
|
|
|
|
# Get name of class:
|
|
in_class = self.pyop_field('in_class')
|
|
cl_name = in_class.pyop_field('cl_name').proxyval(visited)
|
|
|
|
# Get dictionary of instance attributes:
|
|
pyop_in_dict = self.pyop_field('in_dict')
|
|
|
|
_write_instance_repr(out, visited,
|
|
cl_name, pyop_in_dict, self.as_address())
|
|
|
|
class PyIntObjectPtr(PyObjectPtr):
|
|
_typename = 'PyIntObject'
|
|
|
|
def proxyval(self, visited):
|
|
result = int_from_int(self.field('ob_ival'))
|
|
return result
|
|
|
|
class PyListObjectPtr(PyObjectPtr):
|
|
_typename = 'PyListObject'
|
|
|
|
def __getitem__(self, i):
|
|
# Get the gdb.Value for the (PyObject*) with the given index:
|
|
field_ob_item = self.field('ob_item')
|
|
return field_ob_item[i]
|
|
|
|
def proxyval(self, visited):
|
|
# Guard against infinite loops:
|
|
if self.as_address() in visited:
|
|
return ProxyAlreadyVisited('[...]')
|
|
visited.add(self.as_address())
|
|
|
|
result = [PyObjectPtr.from_pyobject_ptr(self[i]).proxyval(visited)
|
|
for i in safe_range(int_from_int(self.field('ob_size')))]
|
|
return result
|
|
|
|
def write_repr(self, out, visited):
|
|
# Guard against infinite loops:
|
|
if self.as_address() in visited:
|
|
out.write('[...]')
|
|
return
|
|
visited.add(self.as_address())
|
|
|
|
out.write('[')
|
|
for i in safe_range(int_from_int(self.field('ob_size'))):
|
|
if i > 0:
|
|
out.write(', ')
|
|
element = PyObjectPtr.from_pyobject_ptr(self[i])
|
|
element.write_repr(out, visited)
|
|
out.write(']')
|
|
|
|
class PyLongObjectPtr(PyObjectPtr):
|
|
_typename = 'PyLongObject'
|
|
|
|
def proxyval(self, visited):
|
|
'''
|
|
Python's Include/longobjrep.h has this declaration:
|
|
struct _longobject {
|
|
PyObject_VAR_HEAD
|
|
digit ob_digit[1];
|
|
};
|
|
|
|
with this description:
|
|
The absolute value of a number is equal to
|
|
SUM(for i=0 through abs(ob_size)-1) ob_digit[i] * 2**(SHIFT*i)
|
|
Negative numbers are represented with ob_size < 0;
|
|
zero is represented by ob_size == 0.
|
|
|
|
where SHIFT can be either:
|
|
#define PyLong_SHIFT 30
|
|
#define PyLong_SHIFT 15
|
|
'''
|
|
ob_size = long(self.field('ob_size'))
|
|
if ob_size == 0:
|
|
return 0L
|
|
|
|
ob_digit = self.field('ob_digit')
|
|
|
|
if gdb.lookup_type('digit').sizeof == 2:
|
|
SHIFT = 15L
|
|
else:
|
|
SHIFT = 30L
|
|
|
|
digits = [long(ob_digit[i]) * 2**(SHIFT*i)
|
|
for i in safe_range(abs(ob_size))]
|
|
result = sum(digits)
|
|
if ob_size < 0:
|
|
result = -result
|
|
return result
|
|
|
|
|
|
class PyNoneStructPtr(PyObjectPtr):
|
|
"""
|
|
Class wrapping a gdb.Value that's a PyObject* pointing to the
|
|
singleton (we hope) _Py_NoneStruct with ob_type PyNone_Type
|
|
"""
|
|
_typename = 'PyObject'
|
|
|
|
def proxyval(self, visited):
|
|
return None
|
|
|
|
|
|
class PyFrameObjectPtr(PyObjectPtr):
|
|
_typename = 'PyFrameObject'
|
|
|
|
def __init__(self, gdbval, cast_to):
|
|
PyObjectPtr.__init__(self, gdbval, cast_to)
|
|
|
|
if not self.is_optimized_out():
|
|
self.co = PyCodeObjectPtr.from_pyobject_ptr(self.field('f_code'))
|
|
self.co_name = self.co.pyop_field('co_name')
|
|
self.co_filename = self.co.pyop_field('co_filename')
|
|
|
|
self.f_lineno = int_from_int(self.field('f_lineno'))
|
|
self.f_lasti = int_from_int(self.field('f_lasti'))
|
|
self.co_nlocals = int_from_int(self.co.field('co_nlocals'))
|
|
self.co_varnames = PyTupleObjectPtr.from_pyobject_ptr(self.co.field('co_varnames'))
|
|
|
|
def iter_locals(self):
|
|
'''
|
|
Yield a sequence of (name,value) pairs of PyObjectPtr instances, for
|
|
the local variables of this frame
|
|
'''
|
|
if self.is_optimized_out():
|
|
return
|
|
|
|
f_localsplus = self.field('f_localsplus')
|
|
for i in safe_range(self.co_nlocals):
|
|
pyop_value = PyObjectPtr.from_pyobject_ptr(f_localsplus[i])
|
|
if not pyop_value.is_null():
|
|
pyop_name = PyObjectPtr.from_pyobject_ptr(self.co_varnames[i])
|
|
yield (pyop_name, pyop_value)
|
|
|
|
def iter_globals(self):
|
|
'''
|
|
Yield a sequence of (name,value) pairs of PyObjectPtr instances, for
|
|
the global variables of this frame
|
|
'''
|
|
if self.is_optimized_out():
|
|
return
|
|
|
|
pyop_globals = self.pyop_field('f_globals')
|
|
return pyop_globals.iteritems()
|
|
|
|
def iter_builtins(self):
|
|
'''
|
|
Yield a sequence of (name,value) pairs of PyObjectPtr instances, for
|
|
the builtin variables
|
|
'''
|
|
if self.is_optimized_out():
|
|
return
|
|
|
|
pyop_builtins = self.pyop_field('f_builtins')
|
|
return pyop_builtins.iteritems()
|
|
|
|
def get_var_by_name(self, name):
|
|
'''
|
|
Look for the named local variable, returning a (PyObjectPtr, scope) pair
|
|
where scope is a string 'local', 'global', 'builtin'
|
|
|
|
If not found, return (None, None)
|
|
'''
|
|
for pyop_name, pyop_value in self.iter_locals():
|
|
if name == pyop_name.proxyval(set()):
|
|
return pyop_value, 'local'
|
|
for pyop_name, pyop_value in self.iter_globals():
|
|
if name == pyop_name.proxyval(set()):
|
|
return pyop_value, 'global'
|
|
for pyop_name, pyop_value in self.iter_builtins():
|
|
if name == pyop_name.proxyval(set()):
|
|
return pyop_value, 'builtin'
|
|
return None, None
|
|
|
|
def filename(self):
|
|
'''Get the path of the current Python source file, as a string'''
|
|
if self.is_optimized_out():
|
|
return '(frame information optimized out)'
|
|
return self.co_filename.proxyval(set())
|
|
|
|
def current_line_num(self):
|
|
'''Get current line number as an integer (1-based)
|
|
|
|
Translated from PyFrame_GetLineNumber and PyCode_Addr2Line
|
|
|
|
See Objects/lnotab_notes.txt
|
|
'''
|
|
if self.is_optimized_out():
|
|
return None
|
|
f_trace = self.field('f_trace')
|
|
if long(f_trace) != 0:
|
|
# we have a non-NULL f_trace:
|
|
return self.f_lineno
|
|
else:
|
|
#try:
|
|
return self.co.addr2line(self.f_lasti)
|
|
#except ValueError:
|
|
# return self.f_lineno
|
|
|
|
def current_line(self):
|
|
'''Get the text of the current source line as a string, with a trailing
|
|
newline character'''
|
|
if self.is_optimized_out():
|
|
return '(frame information optimized out)'
|
|
with open(self.filename(), 'r') as f:
|
|
all_lines = f.readlines()
|
|
# Convert from 1-based current_line_num to 0-based list offset:
|
|
return all_lines[self.current_line_num()-1]
|
|
|
|
def write_repr(self, out, visited):
|
|
if self.is_optimized_out():
|
|
out.write('(frame information optimized out)')
|
|
return
|
|
out.write('Frame 0x%x, for file %s, line %i, in %s ('
|
|
% (self.as_address(),
|
|
self.co_filename,
|
|
self.current_line_num(),
|
|
self.co_name))
|
|
first = True
|
|
for pyop_name, pyop_value in self.iter_locals():
|
|
if not first:
|
|
out.write(', ')
|
|
first = False
|
|
|
|
out.write(pyop_name.proxyval(visited))
|
|
out.write('=')
|
|
pyop_value.write_repr(out, visited)
|
|
|
|
out.write(')')
|
|
|
|
class PySetObjectPtr(PyObjectPtr):
|
|
_typename = 'PySetObject'
|
|
|
|
def proxyval(self, visited):
|
|
# Guard against infinite loops:
|
|
if self.as_address() in visited:
|
|
return ProxyAlreadyVisited('%s(...)' % self.safe_tp_name())
|
|
visited.add(self.as_address())
|
|
|
|
members = []
|
|
table = self.field('table')
|
|
for i in safe_range(self.field('mask')+1):
|
|
setentry = table[i]
|
|
key = setentry['key']
|
|
if key != 0:
|
|
key_proxy = PyObjectPtr.from_pyobject_ptr(key).proxyval(visited)
|
|
if key_proxy != '<dummy key>':
|
|
members.append(key_proxy)
|
|
if self.safe_tp_name() == 'frozenset':
|
|
return frozenset(members)
|
|
else:
|
|
return set(members)
|
|
|
|
def write_repr(self, out, visited):
|
|
out.write(self.safe_tp_name())
|
|
|
|
# Guard against infinite loops:
|
|
if self.as_address() in visited:
|
|
out.write('(...)')
|
|
return
|
|
visited.add(self.as_address())
|
|
|
|
out.write('([')
|
|
first = True
|
|
table = self.field('table')
|
|
for i in safe_range(self.field('mask')+1):
|
|
setentry = table[i]
|
|
key = setentry['key']
|
|
if key != 0:
|
|
pyop_key = PyObjectPtr.from_pyobject_ptr(key)
|
|
key_proxy = pyop_key.proxyval(visited) # FIXME!
|
|
if key_proxy != '<dummy key>':
|
|
if not first:
|
|
out.write(', ')
|
|
first = False
|
|
pyop_key.write_repr(out, visited)
|
|
out.write('])')
|
|
|
|
|
|
class PyStringObjectPtr(PyObjectPtr):
|
|
_typename = 'PyStringObject'
|
|
|
|
def __str__(self):
|
|
field_ob_size = self.field('ob_size')
|
|
field_ob_sval = self.field('ob_sval')
|
|
char_ptr = field_ob_sval.address.cast(_type_unsigned_char_ptr)
|
|
return ''.join([chr(char_ptr[i]) for i in safe_range(field_ob_size)])
|
|
|
|
def proxyval(self, visited):
|
|
return str(self)
|
|
|
|
class PyTupleObjectPtr(PyObjectPtr):
|
|
_typename = 'PyTupleObject'
|
|
|
|
def __getitem__(self, i):
|
|
# Get the gdb.Value for the (PyObject*) with the given index:
|
|
field_ob_item = self.field('ob_item')
|
|
return field_ob_item[i]
|
|
|
|
def proxyval(self, visited):
|
|
# Guard against infinite loops:
|
|
if self.as_address() in visited:
|
|
return ProxyAlreadyVisited('(...)')
|
|
visited.add(self.as_address())
|
|
|
|
result = tuple([PyObjectPtr.from_pyobject_ptr(self[i]).proxyval(visited)
|
|
for i in safe_range(int_from_int(self.field('ob_size')))])
|
|
return result
|
|
|
|
def write_repr(self, out, visited):
|
|
# Guard against infinite loops:
|
|
if self.as_address() in visited:
|
|
out.write('(...)')
|
|
return
|
|
visited.add(self.as_address())
|
|
|
|
out.write('(')
|
|
for i in safe_range(int_from_int(self.field('ob_size'))):
|
|
if i > 0:
|
|
out.write(', ')
|
|
element = PyObjectPtr.from_pyobject_ptr(self[i])
|
|
element.write_repr(out, visited)
|
|
if self.field('ob_size') == 1:
|
|
out.write(',)')
|
|
else:
|
|
out.write(')')
|
|
|
|
class PyTypeObjectPtr(PyObjectPtr):
|
|
_typename = 'PyTypeObject'
|
|
|
|
|
|
class PyUnicodeObjectPtr(PyObjectPtr):
|
|
_typename = 'PyUnicodeObject'
|
|
|
|
def proxyval(self, visited):
|
|
# From unicodeobject.h:
|
|
# Py_ssize_t length; /* Length of raw Unicode data in buffer */
|
|
# Py_UNICODE *str; /* Raw Unicode buffer */
|
|
field_length = long(self.field('length'))
|
|
field_str = self.field('str')
|
|
|
|
# Gather a list of ints from the Py_UNICODE array; these are either
|
|
# UCS-2 or UCS-4 code points:
|
|
Py_UNICODEs = [int(field_str[i]) for i in safe_range(field_length)]
|
|
|
|
# Convert the int code points to unicode characters, and generate a
|
|
# local unicode instance:
|
|
result = u''.join([unichr(ucs) for ucs in Py_UNICODEs])
|
|
return result
|
|
|
|
|
|
def int_from_int(gdbval):
|
|
return int(str(gdbval))
|
|
|
|
|
|
def stringify(val):
|
|
# TODO: repr() puts everything on one line; pformat can be nicer, but
|
|
# can lead to v.long results; this function isolates the choice
|
|
if True:
|
|
return repr(val)
|
|
else:
|
|
from pprint import pformat
|
|
return pformat(val)
|
|
|
|
|
|
class PyObjectPtrPrinter:
|
|
"Prints a (PyObject*)"
|
|
|
|
def __init__ (self, gdbval):
|
|
self.gdbval = gdbval
|
|
|
|
def to_string (self):
|
|
pyop = PyObjectPtr.from_pyobject_ptr(self.gdbval)
|
|
if True:
|
|
return pyop.get_truncated_repr(MAX_OUTPUT_LEN)
|
|
else:
|
|
# Generate full proxy value then stringify it.
|
|
# Doing so could be expensive
|
|
proxyval = pyop.proxyval(set())
|
|
return stringify(proxyval)
|
|
|
|
def pretty_printer_lookup(gdbval):
|
|
type = gdbval.type.unqualified()
|
|
if type.code == gdb.TYPE_CODE_PTR:
|
|
type = type.target().unqualified()
|
|
t = str(type)
|
|
if t in ("PyObject", "PyFrameObject"):
|
|
return PyObjectPtrPrinter(gdbval)
|
|
|
|
"""
|
|
During development, I've been manually invoking the code in this way:
|
|
(gdb) python
|
|
|
|
import sys
|
|
sys.path.append('/home/david/coding/python-gdb')
|
|
import libpython
|
|
end
|
|
|
|
then reloading it after each edit like this:
|
|
(gdb) python reload(libpython)
|
|
|
|
The following code should ensure that the prettyprinter is registered
|
|
if the code is autoloaded by gdb when visiting libpython.so, provided
|
|
that this python file is installed to the same path as the library (or its
|
|
.debug file) plus a "-gdb.py" suffix, e.g:
|
|
/usr/lib/libpython2.6.so.1.0-gdb.py
|
|
/usr/lib/debug/usr/lib/libpython2.6.so.1.0.debug-gdb.py
|
|
"""
|
|
def register (obj):
|
|
if obj == None:
|
|
obj = gdb
|
|
|
|
# Wire up the pretty-printer
|
|
obj.pretty_printers.append(pretty_printer_lookup)
|
|
|
|
register (gdb.current_objfile ())
|
|
|
|
|
|
class Frame(object):
|
|
'''
|
|
Wrapper for gdb.Frame, adding various methods
|
|
'''
|
|
def __init__(self, gdbframe):
|
|
self._gdbframe = gdbframe
|
|
|
|
def older(self):
|
|
older = self._gdbframe.older()
|
|
if older:
|
|
return Frame(older)
|
|
else:
|
|
return None
|
|
|
|
def newer(self):
|
|
newer = self._gdbframe.newer()
|
|
if newer:
|
|
return Frame(newer)
|
|
else:
|
|
return None
|
|
|
|
def select(self):
|
|
self._gdbframe.select()
|
|
|
|
def get_index(self):
|
|
'''Calculate index of frame, starting at 0 for the newest frame within
|
|
this thread'''
|
|
index = 0
|
|
# Go down until you reach the newest frame:
|
|
iter_frame = self
|
|
while iter_frame.newer():
|
|
index += 1
|
|
iter_frame = iter_frame.newer()
|
|
return index
|
|
|
|
def is_evalframeex(self):
|
|
if self._gdbframe.function():
|
|
if self._gdbframe.function().name == 'PyEval_EvalFrameEx':
|
|
'''
|
|
I believe we also need to filter on the inline
|
|
struct frame_id.inline_depth, only regarding frames with
|
|
an inline depth of 0 as actually being this function
|
|
|
|
So we reject those with type gdb.INLINE_FRAME
|
|
'''
|
|
if self._gdbframe.type() == gdb.NORMAL_FRAME:
|
|
# We have a PyEval_EvalFrameEx frame:
|
|
return True
|
|
|
|
return False
|
|
|
|
def get_pyop(self):
|
|
try:
|
|
f = self._gdbframe.read_var('f')
|
|
return PyFrameObjectPtr.from_pyobject_ptr(f)
|
|
except ValueError:
|
|
return None
|
|
|
|
@classmethod
|
|
def get_selected_frame(cls):
|
|
_gdbframe = gdb.selected_frame()
|
|
if _gdbframe:
|
|
return Frame(_gdbframe)
|
|
return None
|
|
|
|
@classmethod
|
|
def get_selected_python_frame(cls):
|
|
'''Try to obtain the Frame for the python code in the selected frame,
|
|
or None'''
|
|
frame = cls.get_selected_frame()
|
|
|
|
while frame:
|
|
if frame.is_evalframeex():
|
|
return frame
|
|
frame = frame.older()
|
|
|
|
# Not found:
|
|
return None
|
|
|
|
def print_summary(self):
|
|
if self.is_evalframeex():
|
|
pyop = self.get_pyop()
|
|
if pyop:
|
|
sys.stdout.write('#%i %s\n' % (self.get_index(), pyop.get_truncated_repr(MAX_OUTPUT_LEN)))
|
|
sys.stdout.write(pyop.current_line())
|
|
else:
|
|
sys.stdout.write('#%i (unable to read python frame information)\n' % self.get_index())
|
|
else:
|
|
sys.stdout.write('#%i\n' % self.get_index())
|
|
|
|
class PyList(gdb.Command):
|
|
'''List the current Python source code, if any
|
|
|
|
Use
|
|
py-list START
|
|
to list at a different line number within the python source.
|
|
|
|
Use
|
|
py-list START, END
|
|
to list a specific range of lines within the python source.
|
|
'''
|
|
|
|
def __init__(self):
|
|
gdb.Command.__init__ (self,
|
|
"py-list",
|
|
gdb.COMMAND_FILES,
|
|
gdb.COMPLETE_NONE)
|
|
|
|
|
|
def invoke(self, args, from_tty):
|
|
import re
|
|
|
|
start = None
|
|
end = None
|
|
|
|
m = re.match(r'\s*(\d+)\s*', args)
|
|
if m:
|
|
start = int(m.group(0))
|
|
end = start + 10
|
|
|
|
m = re.match(r'\s*(\d+)\s*,\s*(\d+)\s*', args)
|
|
if m:
|
|
start, end = map(int, m.groups())
|
|
|
|
frame = Frame.get_selected_python_frame()
|
|
if not frame:
|
|
print 'Unable to locate python frame'
|
|
return
|
|
|
|
pyop = frame.get_pyop()
|
|
if not pyop:
|
|
print 'Unable to read information on python frame'
|
|
return
|
|
|
|
filename = pyop.filename()
|
|
lineno = pyop.current_line_num()
|
|
|
|
if start is None:
|
|
start = lineno - 5
|
|
end = lineno + 5
|
|
|
|
if start<1:
|
|
start = 1
|
|
|
|
with open(filename, 'r') as f:
|
|
all_lines = f.readlines()
|
|
# start and end are 1-based, all_lines is 0-based;
|
|
# so [start-1:end] as a python slice gives us [start, end] as a
|
|
# closed interval
|
|
for i, line in enumerate(all_lines[start-1:end]):
|
|
linestr = str(i+start)
|
|
# Highlight current line:
|
|
if i + start == lineno:
|
|
linestr = '>' + linestr
|
|
sys.stdout.write('%4s %s' % (linestr, line))
|
|
|
|
|
|
# ...and register the command:
|
|
PyList()
|
|
|
|
def move_in_stack(move_up):
|
|
'''Move up or down the stack (for the py-up/py-down command)'''
|
|
frame = Frame.get_selected_python_frame()
|
|
while frame:
|
|
if move_up:
|
|
iter_frame = frame.older()
|
|
else:
|
|
iter_frame = frame.newer()
|
|
|
|
if not iter_frame:
|
|
break
|
|
|
|
if iter_frame.is_evalframeex():
|
|
# Result:
|
|
iter_frame.select()
|
|
iter_frame.print_summary()
|
|
return
|
|
|
|
frame = iter_frame
|
|
|
|
if move_up:
|
|
print 'Unable to find an older python frame'
|
|
else:
|
|
print 'Unable to find a newer python frame'
|
|
|
|
class PyUp(gdb.Command):
|
|
'Select and print the python stack frame that called this one (if any)'
|
|
def __init__(self):
|
|
gdb.Command.__init__ (self,
|
|
"py-up",
|
|
gdb.COMMAND_STACK,
|
|
gdb.COMPLETE_NONE)
|
|
|
|
|
|
def invoke(self, args, from_tty):
|
|
move_in_stack(move_up=True)
|
|
|
|
PyUp()
|
|
|
|
class PyDown(gdb.Command):
|
|
'Select and print the python stack frame called by this one (if any)'
|
|
def __init__(self):
|
|
gdb.Command.__init__ (self,
|
|
"py-down",
|
|
gdb.COMMAND_STACK,
|
|
gdb.COMPLETE_NONE)
|
|
|
|
|
|
def invoke(self, args, from_tty):
|
|
move_in_stack(move_up=False)
|
|
|
|
PyDown()
|
|
|
|
class PyBacktrace(gdb.Command):
|
|
'Display the current python frame and all the frames within its call stack (if any)'
|
|
def __init__(self):
|
|
gdb.Command.__init__ (self,
|
|
"py-bt",
|
|
gdb.COMMAND_STACK,
|
|
gdb.COMPLETE_NONE)
|
|
|
|
|
|
def invoke(self, args, from_tty):
|
|
frame = Frame.get_selected_python_frame()
|
|
while frame:
|
|
if frame.is_evalframeex():
|
|
frame.print_summary()
|
|
frame = frame.older()
|
|
|
|
PyBacktrace()
|
|
|
|
class PyPrint(gdb.Command):
|
|
'Look up the given python variable name, and print it'
|
|
def __init__(self):
|
|
gdb.Command.__init__ (self,
|
|
"py-print",
|
|
gdb.COMMAND_DATA,
|
|
gdb.COMPLETE_NONE)
|
|
|
|
|
|
def invoke(self, args, from_tty):
|
|
name = str(args)
|
|
|
|
frame = Frame.get_selected_python_frame()
|
|
if not frame:
|
|
print 'Unable to locate python frame'
|
|
return
|
|
|
|
pyop_frame = frame.get_pyop()
|
|
if not pyop_frame:
|
|
print 'Unable to read information on python frame'
|
|
return
|
|
|
|
pyop_var, scope = pyop_frame.get_var_by_name(name)
|
|
|
|
if pyop_var:
|
|
print ('%s %r = %s'
|
|
% (scope,
|
|
name,
|
|
pyop_var.get_truncated_repr(MAX_OUTPUT_LEN)))
|
|
else:
|
|
print '%r not found' % name
|
|
|
|
PyPrint()
|
|
|
|
class PyLocals(gdb.Command):
|
|
'Look up the given python variable name, and print it'
|
|
def __init__(self):
|
|
gdb.Command.__init__ (self,
|
|
"py-locals",
|
|
gdb.COMMAND_DATA,
|
|
gdb.COMPLETE_NONE)
|
|
|
|
|
|
def invoke(self, args, from_tty):
|
|
name = str(args)
|
|
|
|
frame = Frame.get_selected_python_frame()
|
|
if not frame:
|
|
print 'Unable to locate python frame'
|
|
return
|
|
|
|
pyop_frame = frame.get_pyop()
|
|
if not pyop_frame:
|
|
print 'Unable to read information on python frame'
|
|
return
|
|
|
|
for pyop_name, pyop_value in pyop_frame.iter_locals():
|
|
print ('%s = %s'
|
|
% (pyop_name.proxyval(set()),
|
|
pyop_value.get_truncated_repr(MAX_OUTPUT_LEN)))
|
|
|
|
PyLocals()
|