2761 lines
88 KiB
Python
2761 lines
88 KiB
Python
#!/usr/bin/python
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# NOTE: this file is taken from the Python source distribution
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# It can be found under Tools/gdb/libpython.py. It is shipped with Cython
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# because it's not installed as a python module, and because changes are only
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# merged into new python versions (v3.2+).
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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 PyBytesObject* instances, we can
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generate a proxy value within the gdb process that is a list of bytes
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instances:
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[b"foo", b"bar", b"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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# NOTE: some gdbs are linked with Python 3, so this file should be dual-syntax
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# compatible (2.6+ and 3.0+). See #19308.
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from __future__ import print_function
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import gdb
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import os
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import locale
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import sys
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if sys.version_info[0] >= 3:
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unichr = chr
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xrange = range
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long = int
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# Look up the gdb.Type for some standard types:
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# Those need to be refreshed as types (pointer sizes) may change when
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# gdb loads different executables
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def _type_char_ptr():
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return gdb.lookup_type('char').pointer() # char*
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def _type_unsigned_char_ptr():
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return gdb.lookup_type('unsigned char').pointer() # unsigned char*
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def _type_unsigned_short_ptr():
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return gdb.lookup_type('unsigned short').pointer()
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def _type_unsigned_int_ptr():
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return gdb.lookup_type('unsigned int').pointer()
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def _sizeof_void_p():
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return gdb.lookup_type('void').pointer().sizeof
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# value computed later, see PyUnicodeObjectPtr.proxy()
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_is_pep393 = None
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Py_TPFLAGS_HEAPTYPE = (1 << 9)
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Py_TPFLAGS_LONG_SUBCLASS = (1 << 24)
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Py_TPFLAGS_LIST_SUBCLASS = (1 << 25)
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Py_TPFLAGS_TUPLE_SUBCLASS = (1 << 26)
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Py_TPFLAGS_BYTES_SUBCLASS = (1 << 27)
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Py_TPFLAGS_UNICODE_SUBCLASS = (1 << 28)
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Py_TPFLAGS_DICT_SUBCLASS = (1 << 29)
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Py_TPFLAGS_BASE_EXC_SUBCLASS = (1 << 30)
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Py_TPFLAGS_TYPE_SUBCLASS = (1 << 31)
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MAX_OUTPUT_LEN=1024
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hexdigits = "0123456789abcdef"
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ENCODING = locale.getpreferredencoding()
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EVALFRAME = '_PyEval_EvalFrameDefault'
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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 an 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(int(val)))
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if sys.version_info[0] >= 3:
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def write_unicode(file, text):
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file.write(text)
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else:
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def write_unicode(file, text):
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# Write a byte or unicode string to file. Unicode strings are encoded to
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# ENCODING encoding with 'backslashreplace' error handler to avoid
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# UnicodeEncodeError.
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if isinstance(text, unicode):
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text = text.encode(ENCODING, 'backslashreplace')
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file.write(text)
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try:
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os_fsencode = os.fsencode
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except AttributeError:
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def os_fsencode(filename):
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if not isinstance(filename, unicode):
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return filename
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encoding = sys.getfilesystemencoding()
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if encoding == 'mbcs':
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# mbcs doesn't support surrogateescape
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return filename.encode(encoding)
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encoded = []
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for char in filename:
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# surrogateescape error handler
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if 0xDC80 <= ord(char) <= 0xDCFF:
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byte = chr(ord(char) - 0xDC00)
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else:
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byte = char.encode(encoding)
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encoded.append(byte)
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return ''.join(encoded)
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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 io.StringIO, 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 either a (PyObject*) within the
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inferior process, or some subclass pointer e.g. (PyBytesObject*)
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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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pyo_ptr = self._gdbval.cast(PyVarObjectPtr.get_gdb_type())
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return pyo_ptr.dereference()[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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'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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'method-wrapper': wrapperobject,
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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_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_BYTES_SUBCLASS:
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return PyBytesObjectPtr
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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 PyVarObjectPtr(PyObjectPtr):
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_typename = 'PyVarObject'
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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 all 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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if _PyObject_VAR_SIZE._type_size_t is None:
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_PyObject_VAR_SIZE._type_size_t = gdb.lookup_type('size_t')
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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(_PyObject_VAR_SIZE._type_size_t)
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_PyObject_VAR_SIZE._type_size_t = None
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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
|
|
(or None if there's a problem)
|
|
'''
|
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try:
|
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typeobj = self.type()
|
|
dictoffset = int_from_int(typeobj.field('tp_dictoffset'))
|
|
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
|
|
assert dictoffset % _sizeof_void_p() == 0
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|
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dictptr = self._gdbval.cast(_type_char_ptr()) + dictoffset
|
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PyObjectPtrPtr = PyObjectPtr.get_gdb_type().pointer()
|
|
dictptr = dictptr.cast(PyObjectPtrPtr)
|
|
return PyObjectPtr.from_pyobject_ptr(dictptr.dereference())
|
|
except RuntimeError:
|
|
# Corrupt data somewhere; fail safe
|
|
pass
|
|
|
|
# Not found, or some kind of error:
|
|
return None
|
|
|
|
def proxyval(self, visited):
|
|
'''
|
|
Support for classes.
|
|
|
|
Currently we just locate the dictionary using a transliteration to
|
|
python of _PyObject_GetDictPtr, ignoring descriptors
|
|
'''
|
|
# Guard against infinite loops:
|
|
if self.as_address() in visited:
|
|
return ProxyAlreadyVisited('<...>')
|
|
visited.add(self.as_address())
|
|
|
|
pyop_attr_dict = self.get_attr_dict()
|
|
if pyop_attr_dict:
|
|
attr_dict = pyop_attr_dict.proxyval(visited)
|
|
else:
|
|
attr_dict = {}
|
|
tp_name = self.safe_tp_name()
|
|
|
|
# Class:
|
|
return InstanceProxy(tp_name, attr_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())
|
|
|
|
pyop_attrdict = self.get_attr_dict()
|
|
_write_instance_repr(out, visited,
|
|
self.safe_tp_name(), pyop_attrdict, self.as_address())
|
|
|
|
class ProxyException(Exception):
|
|
def __init__(self, tp_name, args):
|
|
self.tp_name = tp_name
|
|
self.args = args
|
|
|
|
def __repr__(self):
|
|
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:
|
|
return ProxyAlreadyVisited('(...)')
|
|
visited.add(self.as_address())
|
|
arg_proxy = self.pyop_field('args').proxyval(visited)
|
|
return ProxyException(self.safe_tp_name(),
|
|
arg_proxy)
|
|
|
|
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 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,
|
|
analogous to dict.iteritems()
|
|
'''
|
|
keys = self.field('ma_keys')
|
|
values = self.field('ma_values')
|
|
entries, nentries = self._get_entries(keys)
|
|
for i in safe_range(nentries):
|
|
ep = entries[i]
|
|
if long(values):
|
|
pyop_value = PyObjectPtr.from_pyobject_ptr(values[i])
|
|
else:
|
|
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('}')
|
|
|
|
def _get_entries(self, keys):
|
|
dk_nentries = int(keys['dk_nentries'])
|
|
dk_size = int(keys['dk_size'])
|
|
try:
|
|
# <= Python 3.5
|
|
return keys['dk_entries'], dk_size
|
|
except RuntimeError:
|
|
# >= Python 3.6
|
|
pass
|
|
|
|
if dk_size <= 0xFF:
|
|
offset = dk_size
|
|
elif dk_size <= 0xFFFF:
|
|
offset = 2 * dk_size
|
|
elif dk_size <= 0xFFFFFFFF:
|
|
offset = 4 * dk_size
|
|
else:
|
|
offset = 8 * dk_size
|
|
|
|
ent_addr = keys['dk_indices']['as_1'].address
|
|
ent_addr = ent_addr.cast(_type_unsigned_char_ptr()) + offset
|
|
ent_ptr_t = gdb.lookup_type('PyDictKeyEntry').pointer()
|
|
ent_addr = ent_addr.cast(ent_ptr_t)
|
|
|
|
return ent_addr, dk_nentries
|
|
|
|
|
|
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 0
|
|
|
|
ob_digit = self.field('ob_digit')
|
|
|
|
if gdb.lookup_type('digit').sizeof == 2:
|
|
SHIFT = 15
|
|
else:
|
|
SHIFT = 30
|
|
|
|
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
|
|
|
|
def write_repr(self, out, visited):
|
|
# Write this out as a Python 3 int literal, i.e. without the "L" suffix
|
|
proxy = self.proxyval(visited)
|
|
out.write("%s" % proxy)
|
|
|
|
|
|
class PyBoolObjectPtr(PyLongObjectPtr):
|
|
"""
|
|
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.
|
|
"""
|
|
def proxyval(self, visited):
|
|
if PyLongObjectPtr.proxyval(self, visited):
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
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=None):
|
|
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)'
|
|
filename = self.filename()
|
|
try:
|
|
f = open(os_fsencode(filename), 'r')
|
|
except IOError:
|
|
return None
|
|
with 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.proxyval(visited),
|
|
self.current_line_num(),
|
|
self.co_name.proxyval(visited)))
|
|
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(')')
|
|
|
|
def print_traceback(self):
|
|
if self.is_optimized_out():
|
|
sys.stdout.write(' (frame information optimized out)\n')
|
|
return
|
|
visited = set()
|
|
sys.stdout.write(' File "%s", line %i, in %s\n'
|
|
% (self.co_filename.proxyval(visited),
|
|
self.current_line_num(),
|
|
self.co_name.proxyval(visited)))
|
|
|
|
class PySetObjectPtr(PyObjectPtr):
|
|
_typename = 'PySetObject'
|
|
|
|
@classmethod
|
|
def _dummy_key(self):
|
|
return gdb.lookup_global_symbol('_PySet_Dummy').value()
|
|
|
|
def __iter__(self):
|
|
dummy_ptr = self._dummy_key()
|
|
table = self.field('table')
|
|
for i in safe_range(self.field('mask') + 1):
|
|
setentry = table[i]
|
|
key = setentry['key']
|
|
if key != 0 and key != dummy_ptr:
|
|
yield PyObjectPtr.from_pyobject_ptr(key)
|
|
|
|
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 = (key.proxyval(visited) for key in self)
|
|
if self.safe_tp_name() == 'frozenset':
|
|
return frozenset(members)
|
|
else:
|
|
return set(members)
|
|
|
|
def write_repr(self, out, visited):
|
|
# Emulate Python 3's set_repr
|
|
tp_name = self.safe_tp_name()
|
|
|
|
# Guard against infinite loops:
|
|
if self.as_address() in visited:
|
|
out.write('(...)')
|
|
return
|
|
visited.add(self.as_address())
|
|
|
|
# Python 3's set_repr special-cases the empty set:
|
|
if not self.field('used'):
|
|
out.write(tp_name)
|
|
out.write('()')
|
|
return
|
|
|
|
# Python 3 uses {} for set literals:
|
|
if tp_name != 'set':
|
|
out.write(tp_name)
|
|
out.write('(')
|
|
|
|
out.write('{')
|
|
first = True
|
|
for key in self:
|
|
if not first:
|
|
out.write(', ')
|
|
first = False
|
|
key.write_repr(out, visited)
|
|
out.write('}')
|
|
|
|
if tp_name != 'set':
|
|
out.write(')')
|
|
|
|
|
|
class PyBytesObjectPtr(PyObjectPtr):
|
|
_typename = 'PyBytesObject'
|
|
|
|
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)
|
|
|
|
def write_repr(self, out, visited):
|
|
# Write this out as a Python 3 bytes literal, i.e. with a "b" prefix
|
|
|
|
# Get a PyStringObject* within the Python 2 gdb process:
|
|
proxy = self.proxyval(visited)
|
|
|
|
# Transliteration of Python 3's Objects/bytesobject.c:PyBytes_Repr
|
|
# to Python 2 code:
|
|
quote = "'"
|
|
if "'" in proxy and not '"' in proxy:
|
|
quote = '"'
|
|
out.write('b')
|
|
out.write(quote)
|
|
for byte in proxy:
|
|
if byte == quote or byte == '\\':
|
|
out.write('\\')
|
|
out.write(byte)
|
|
elif byte == '\t':
|
|
out.write('\\t')
|
|
elif byte == '\n':
|
|
out.write('\\n')
|
|
elif byte == '\r':
|
|
out.write('\\r')
|
|
elif byte < ' ' or ord(byte) >= 0x7f:
|
|
out.write('\\x')
|
|
out.write(hexdigits[(ord(byte) & 0xf0) >> 4])
|
|
out.write(hexdigits[ord(byte) & 0xf])
|
|
else:
|
|
out.write(byte)
|
|
out.write(quote)
|
|
|
|
|
|
class PyStringObjectPtr(PyBytesObjectPtr):
|
|
_typename = 'PyStringObject'
|
|
|
|
|
|
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'
|
|
|
|
|
|
def _unichr_is_printable(char):
|
|
# Logic adapted from Python 3's Tools/unicode/makeunicodedata.py
|
|
if char == u" ":
|
|
return True
|
|
import unicodedata
|
|
return unicodedata.category(char) not in ("C", "Z")
|
|
|
|
if sys.maxunicode >= 0x10000:
|
|
_unichr = unichr
|
|
else:
|
|
# Needed for proper surrogate support if sizeof(Py_UNICODE) is 2 in gdb
|
|
def _unichr(x):
|
|
if x < 0x10000:
|
|
return unichr(x)
|
|
x -= 0x10000
|
|
ch1 = 0xD800 | (x >> 10)
|
|
ch2 = 0xDC00 | (x & 0x3FF)
|
|
return unichr(ch1) + unichr(ch2)
|
|
|
|
|
|
class PyUnicodeObjectPtr(PyObjectPtr):
|
|
_typename = 'PyUnicodeObject'
|
|
|
|
def char_width(self):
|
|
_type_Py_UNICODE = gdb.lookup_type('Py_UNICODE')
|
|
return _type_Py_UNICODE.sizeof
|
|
|
|
def proxyval(self, visited):
|
|
global _is_pep393
|
|
if _is_pep393 is None:
|
|
fields = gdb.lookup_type('PyUnicodeObject').target().fields()
|
|
_is_pep393 = 'data' in [f.name for f in fields]
|
|
if _is_pep393:
|
|
# Python 3.3 and newer
|
|
may_have_surrogates = False
|
|
compact = self.field('_base')
|
|
ascii = compact['_base']
|
|
state = ascii['state']
|
|
is_compact_ascii = (int(state['ascii']) and int(state['compact']))
|
|
if not int(state['ready']):
|
|
# string is not ready
|
|
field_length = long(compact['wstr_length'])
|
|
may_have_surrogates = True
|
|
field_str = ascii['wstr']
|
|
else:
|
|
field_length = long(ascii['length'])
|
|
if is_compact_ascii:
|
|
field_str = ascii.address + 1
|
|
elif int(state['compact']):
|
|
field_str = compact.address + 1
|
|
else:
|
|
field_str = self.field('data')['any']
|
|
repr_kind = int(state['kind'])
|
|
if repr_kind == 1:
|
|
field_str = field_str.cast(_type_unsigned_char_ptr())
|
|
elif repr_kind == 2:
|
|
field_str = field_str.cast(_type_unsigned_short_ptr())
|
|
elif repr_kind == 4:
|
|
field_str = field_str.cast(_type_unsigned_int_ptr())
|
|
else:
|
|
# Python 3.2 and earlier
|
|
field_length = long(self.field('length'))
|
|
field_str = self.field('str')
|
|
may_have_surrogates = self.char_width() == 2
|
|
|
|
# Gather a list of ints from the Py_UNICODE array; these are either
|
|
# UCS-1, UCS-2 or UCS-4 code points:
|
|
if not may_have_surrogates:
|
|
Py_UNICODEs = [int(field_str[i]) for i in safe_range(field_length)]
|
|
else:
|
|
# A more elaborate routine if sizeof(Py_UNICODE) is 2 in the
|
|
# inferior process: we must join surrogate pairs.
|
|
Py_UNICODEs = []
|
|
i = 0
|
|
limit = safety_limit(field_length)
|
|
while i < limit:
|
|
ucs = int(field_str[i])
|
|
i += 1
|
|
if ucs < 0xD800 or ucs >= 0xDC00 or i == field_length:
|
|
Py_UNICODEs.append(ucs)
|
|
continue
|
|
# This could be a surrogate pair.
|
|
ucs2 = int(field_str[i])
|
|
if ucs2 < 0xDC00 or ucs2 > 0xDFFF:
|
|
continue
|
|
code = (ucs & 0x03FF) << 10
|
|
code |= ucs2 & 0x03FF
|
|
code += 0x00010000
|
|
Py_UNICODEs.append(code)
|
|
i += 1
|
|
|
|
# Convert the int code points to unicode characters, and generate a
|
|
# local unicode instance.
|
|
# This splits surrogate pairs if sizeof(Py_UNICODE) is 2 here (in gdb).
|
|
result = u''.join([
|
|
(_unichr(ucs) if ucs <= 0x10ffff else '\ufffd')
|
|
for ucs in Py_UNICODEs])
|
|
return result
|
|
|
|
def write_repr(self, out, visited):
|
|
# Write this out as a Python 3 str literal, i.e. without a "u" prefix
|
|
|
|
# Get a PyUnicodeObject* within the Python 2 gdb process:
|
|
proxy = self.proxyval(visited)
|
|
|
|
# Transliteration of Python 3's Object/unicodeobject.c:unicode_repr
|
|
# to Python 2:
|
|
if "'" in proxy and '"' not in proxy:
|
|
quote = '"'
|
|
else:
|
|
quote = "'"
|
|
out.write(quote)
|
|
|
|
i = 0
|
|
while i < len(proxy):
|
|
ch = proxy[i]
|
|
i += 1
|
|
|
|
# Escape quotes and backslashes
|
|
if ch == quote or ch == '\\':
|
|
out.write('\\')
|
|
out.write(ch)
|
|
|
|
# Map special whitespace to '\t', \n', '\r'
|
|
elif ch == '\t':
|
|
out.write('\\t')
|
|
elif ch == '\n':
|
|
out.write('\\n')
|
|
elif ch == '\r':
|
|
out.write('\\r')
|
|
|
|
# Map non-printable US ASCII to '\xhh' */
|
|
elif ch < ' ' or ch == 0x7F:
|
|
out.write('\\x')
|
|
out.write(hexdigits[(ord(ch) >> 4) & 0x000F])
|
|
out.write(hexdigits[ord(ch) & 0x000F])
|
|
|
|
# Copy ASCII characters as-is
|
|
elif ord(ch) < 0x7F:
|
|
out.write(ch)
|
|
|
|
# Non-ASCII characters
|
|
else:
|
|
ucs = ch
|
|
ch2 = None
|
|
if sys.maxunicode < 0x10000:
|
|
# If sizeof(Py_UNICODE) is 2 here (in gdb), join
|
|
# surrogate pairs before calling _unichr_is_printable.
|
|
if (i < len(proxy)
|
|
and 0xD800 <= ord(ch) < 0xDC00 \
|
|
and 0xDC00 <= ord(proxy[i]) <= 0xDFFF):
|
|
ch2 = proxy[i]
|
|
ucs = ch + ch2
|
|
i += 1
|
|
|
|
# Unfortuately, Python 2's unicode type doesn't seem
|
|
# to expose the "isprintable" method
|
|
printable = _unichr_is_printable(ucs)
|
|
if printable:
|
|
try:
|
|
ucs.encode(ENCODING)
|
|
except UnicodeEncodeError:
|
|
printable = False
|
|
|
|
# Map Unicode whitespace and control characters
|
|
# (categories Z* and C* except ASCII space)
|
|
if not printable:
|
|
if ch2 is not None:
|
|
# Match Python 3's representation of non-printable
|
|
# wide characters.
|
|
code = (ord(ch) & 0x03FF) << 10
|
|
code |= ord(ch2) & 0x03FF
|
|
code += 0x00010000
|
|
else:
|
|
code = ord(ucs)
|
|
|
|
# Map 8-bit characters to '\\xhh'
|
|
if code <= 0xff:
|
|
out.write('\\x')
|
|
out.write(hexdigits[(code >> 4) & 0x000F])
|
|
out.write(hexdigits[code & 0x000F])
|
|
# Map 21-bit characters to '\U00xxxxxx'
|
|
elif code >= 0x10000:
|
|
out.write('\\U')
|
|
out.write(hexdigits[(code >> 28) & 0x0000000F])
|
|
out.write(hexdigits[(code >> 24) & 0x0000000F])
|
|
out.write(hexdigits[(code >> 20) & 0x0000000F])
|
|
out.write(hexdigits[(code >> 16) & 0x0000000F])
|
|
out.write(hexdigits[(code >> 12) & 0x0000000F])
|
|
out.write(hexdigits[(code >> 8) & 0x0000000F])
|
|
out.write(hexdigits[(code >> 4) & 0x0000000F])
|
|
out.write(hexdigits[code & 0x0000000F])
|
|
# Map 16-bit characters to '\uxxxx'
|
|
else:
|
|
out.write('\\u')
|
|
out.write(hexdigits[(code >> 12) & 0x000F])
|
|
out.write(hexdigits[(code >> 8) & 0x000F])
|
|
out.write(hexdigits[(code >> 4) & 0x000F])
|
|
out.write(hexdigits[code & 0x000F])
|
|
else:
|
|
# Copy characters as-is
|
|
out.write(ch)
|
|
if ch2 is not None:
|
|
out.write(ch2)
|
|
|
|
out.write(quote)
|
|
|
|
|
|
class wrapperobject(PyObjectPtr):
|
|
_typename = 'wrapperobject'
|
|
|
|
def safe_name(self):
|
|
try:
|
|
name = self.field('descr')['d_base']['name'].string()
|
|
return repr(name)
|
|
except (NullPyObjectPtr, RuntimeError):
|
|
return '<unknown name>'
|
|
|
|
def safe_tp_name(self):
|
|
try:
|
|
return self.field('self')['ob_type']['tp_name'].string()
|
|
except (NullPyObjectPtr, RuntimeError):
|
|
return '<unknown tp_name>'
|
|
|
|
def safe_self_addresss(self):
|
|
try:
|
|
address = long(self.field('self'))
|
|
return '%#x' % address
|
|
except (NullPyObjectPtr, RuntimeError):
|
|
return '<failed to get self address>'
|
|
|
|
def proxyval(self, visited):
|
|
name = self.safe_name()
|
|
tp_name = self.safe_tp_name()
|
|
self_address = self.safe_self_addresss()
|
|
return ("<method-wrapper %s of %s object at %s>"
|
|
% (name, tp_name, self_address))
|
|
|
|
def write_repr(self, out, visited):
|
|
proxy = self.proxyval(visited)
|
|
out.write(proxy)
|
|
|
|
|
|
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:
|
|
return None
|
|
|
|
type = type.target().unqualified()
|
|
t = str(type)
|
|
if t in ("PyObject", "PyFrameObject", "PyUnicodeObject", "wrapperobject"):
|
|
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 is None:
|
|
obj = gdb
|
|
|
|
# Wire up the pretty-printer
|
|
obj.pretty_printers.append(pretty_printer_lookup)
|
|
|
|
register (gdb.current_objfile ())
|
|
|
|
|
|
|
|
# Unfortunately, the exact API exposed by the gdb module varies somewhat
|
|
# from build to build
|
|
# See http://bugs.python.org/issue8279?#msg102276
|
|
|
|
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):
|
|
'''If supported, select this frame and return True; return False if unsupported
|
|
|
|
Not all builds have a gdb.Frame.select method; seems to be present on Fedora 12
|
|
onwards, but absent on Ubuntu buildbot'''
|
|
if not hasattr(self._gdbframe, 'select'):
|
|
print ('Unable to select frame: '
|
|
'this build of gdb does not expose a gdb.Frame.select method')
|
|
return False
|
|
self._gdbframe.select()
|
|
return True
|
|
|
|
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
|
|
|
|
# We divide frames into:
|
|
# - "python frames":
|
|
# - "bytecode frames" i.e. PyEval_EvalFrameEx
|
|
# - "other python frames": things that are of interest from a python
|
|
# POV, but aren't bytecode (e.g. GC, GIL)
|
|
# - everything else
|
|
|
|
def is_python_frame(self):
|
|
'''Is this a _PyEval_EvalFrameDefault frame, or some other important
|
|
frame? (see is_other_python_frame for what "important" means in this
|
|
context)'''
|
|
if self.is_evalframe():
|
|
return True
|
|
if self.is_other_python_frame():
|
|
return True
|
|
return False
|
|
|
|
def is_evalframe(self):
|
|
'''Is this a _PyEval_EvalFrameDefault frame?'''
|
|
if self._gdbframe.name() == EVALFRAME:
|
|
'''
|
|
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_EvalFrameDefault frame:
|
|
return True
|
|
|
|
return False
|
|
|
|
def is_other_python_frame(self):
|
|
'''Is this frame worth displaying in python backtraces?
|
|
Examples:
|
|
- waiting on the GIL
|
|
- garbage-collecting
|
|
- within a CFunction
|
|
If it is, return a descriptive string
|
|
For other frames, return False
|
|
'''
|
|
if self.is_waiting_for_gil():
|
|
return 'Waiting for the GIL'
|
|
|
|
if self.is_gc_collect():
|
|
return 'Garbage-collecting'
|
|
|
|
# Detect invocations of PyCFunction instances:
|
|
frame = self._gdbframe
|
|
caller = frame.name()
|
|
if not caller:
|
|
return False
|
|
|
|
if caller in ('_PyCFunction_FastCallDict',
|
|
'_PyCFunction_FastCallKeywords'):
|
|
arg_name = 'func'
|
|
# Within that frame:
|
|
# "func" is the local containing the PyObject* of the
|
|
# PyCFunctionObject instance
|
|
# "f" is the same value, but cast to (PyCFunctionObject*)
|
|
# "self" is the (PyObject*) of the 'self'
|
|
try:
|
|
# Use the prettyprinter for the func:
|
|
func = frame.read_var(arg_name)
|
|
return str(func)
|
|
except RuntimeError:
|
|
return 'PyCFunction invocation (unable to read %s)' % arg_name
|
|
|
|
if caller == 'wrapper_call':
|
|
try:
|
|
func = frame.read_var('wp')
|
|
return str(func)
|
|
except RuntimeError:
|
|
return '<wrapper_call invocation>'
|
|
|
|
# This frame isn't worth reporting:
|
|
return False
|
|
|
|
def is_waiting_for_gil(self):
|
|
'''Is this frame waiting on the GIL?'''
|
|
# This assumes the _POSIX_THREADS version of Python/ceval_gil.h:
|
|
name = self._gdbframe.name()
|
|
if name:
|
|
return 'pthread_cond_timedwait' in name
|
|
|
|
def is_gc_collect(self):
|
|
'''Is this frame "collect" within the garbage-collector?'''
|
|
return self._gdbframe.name() == 'collect'
|
|
|
|
def get_pyop(self):
|
|
try:
|
|
f = self._gdbframe.read_var('f')
|
|
frame = PyFrameObjectPtr.from_pyobject_ptr(f)
|
|
if not frame.is_optimized_out():
|
|
return frame
|
|
# gdb is unable to get the "f" argument of PyEval_EvalFrameEx()
|
|
# because it was "optimized out". Try to get "f" from the frame
|
|
# of the caller, PyEval_EvalCodeEx().
|
|
orig_frame = frame
|
|
caller = self._gdbframe.older()
|
|
if caller:
|
|
f = caller.read_var('f')
|
|
frame = PyFrameObjectPtr.from_pyobject_ptr(f)
|
|
if not frame.is_optimized_out():
|
|
return frame
|
|
return orig_frame
|
|
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-related code in the selected
|
|
frame, or None'''
|
|
try:
|
|
frame = cls.get_selected_frame()
|
|
except gdb.error:
|
|
# No frame: Python didn't start yet
|
|
return None
|
|
|
|
while frame:
|
|
if frame.is_python_frame():
|
|
return frame
|
|
frame = frame.older()
|
|
|
|
# Not found:
|
|
return None
|
|
|
|
@classmethod
|
|
def get_selected_bytecode_frame(cls):
|
|
'''Try to obtain the Frame for the python bytecode interpreter in the
|
|
selected GDB frame, or None'''
|
|
frame = cls.get_selected_frame()
|
|
|
|
while frame:
|
|
if frame.is_evalframe():
|
|
return frame
|
|
frame = frame.older()
|
|
|
|
# Not found:
|
|
return None
|
|
|
|
def print_summary(self):
|
|
if self.is_evalframe():
|
|
pyop = self.get_pyop()
|
|
if pyop:
|
|
line = pyop.get_truncated_repr(MAX_OUTPUT_LEN)
|
|
write_unicode(sys.stdout, '#%i %s\n' % (self.get_index(), line))
|
|
if not pyop.is_optimized_out():
|
|
line = pyop.current_line()
|
|
if line is not None:
|
|
sys.stdout.write(' %s\n' % line.strip())
|
|
else:
|
|
sys.stdout.write('#%i (unable to read python frame information)\n' % self.get_index())
|
|
else:
|
|
info = self.is_other_python_frame()
|
|
if info:
|
|
sys.stdout.write('#%i %s\n' % (self.get_index(), info))
|
|
else:
|
|
sys.stdout.write('#%i\n' % self.get_index())
|
|
|
|
def print_traceback(self):
|
|
if self.is_evalframe():
|
|
pyop = self.get_pyop()
|
|
if pyop:
|
|
pyop.print_traceback()
|
|
if not pyop.is_optimized_out():
|
|
line = pyop.current_line()
|
|
if line is not None:
|
|
sys.stdout.write(' %s\n' % line.strip())
|
|
else:
|
|
sys.stdout.write(' (unable to read python frame information)\n')
|
|
else:
|
|
info = self.is_other_python_frame()
|
|
if info:
|
|
sys.stdout.write(' %s\n' % info)
|
|
else:
|
|
sys.stdout.write(' (not a python frame)\n')
|
|
|
|
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())
|
|
|
|
# py-list requires an actual PyEval_EvalFrameEx frame:
|
|
frame = Frame.get_selected_bytecode_frame()
|
|
if not frame:
|
|
print('Unable to locate gdb frame for python bytecode interpreter')
|
|
return
|
|
|
|
pyop = frame.get_pyop()
|
|
if not pyop or pyop.is_optimized_out():
|
|
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
|
|
|
|
try:
|
|
f = open(os_fsencode(filename), 'r')
|
|
except IOError as err:
|
|
sys.stdout.write('Unable to open %s: %s\n'
|
|
% (filename, err))
|
|
return
|
|
with 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()
|
|
if not frame:
|
|
print('Unable to locate python frame')
|
|
return
|
|
|
|
while frame:
|
|
if move_up:
|
|
iter_frame = frame.older()
|
|
else:
|
|
iter_frame = frame.newer()
|
|
|
|
if not iter_frame:
|
|
break
|
|
|
|
if iter_frame.is_python_frame():
|
|
# Result:
|
|
if 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)
|
|
|
|
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)
|
|
|
|
# Not all builds of gdb have gdb.Frame.select
|
|
if hasattr(gdb.Frame, 'select'):
|
|
PyUp()
|
|
PyDown()
|
|
|
|
class PyBacktraceFull(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-full",
|
|
gdb.COMMAND_STACK,
|
|
gdb.COMPLETE_NONE)
|
|
|
|
|
|
def invoke(self, args, from_tty):
|
|
frame = Frame.get_selected_python_frame()
|
|
if not frame:
|
|
print('Unable to locate python frame')
|
|
return
|
|
|
|
while frame:
|
|
if frame.is_python_frame():
|
|
frame.print_summary()
|
|
frame = frame.older()
|
|
|
|
PyBacktraceFull()
|
|
|
|
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()
|
|
if not frame:
|
|
print('Unable to locate python frame')
|
|
return
|
|
|
|
sys.stdout.write('Traceback (most recent call first):\n')
|
|
while frame:
|
|
if frame.is_python_frame():
|
|
frame.print_traceback()
|
|
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, command="py-locals"):
|
|
gdb.Command.__init__ (self,
|
|
command,
|
|
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
|
|
|
|
namespace = self.get_namespace(pyop_frame)
|
|
namespace = [(name.proxyval(set()), val) for name, val in namespace]
|
|
|
|
if namespace:
|
|
name, val = max(namespace, key=lambda item: len(item[0]))
|
|
max_name_length = len(name)
|
|
|
|
for name, pyop_value in namespace:
|
|
value = pyop_value.get_truncated_repr(MAX_OUTPUT_LEN)
|
|
print('%-*s = %s' % (max_name_length, name, value))
|
|
|
|
def get_namespace(self, pyop_frame):
|
|
return pyop_frame.iter_locals()
|
|
|
|
PyLocals()
|
|
|
|
|
|
##################################################################
|
|
## added, not in CPython
|
|
##################################################################
|
|
|
|
import re
|
|
import warnings
|
|
import tempfile
|
|
import textwrap
|
|
import itertools
|
|
|
|
class PyGlobals(PyLocals):
|
|
'List all the globals in the currently select Python frame'
|
|
|
|
def get_namespace(self, pyop_frame):
|
|
return pyop_frame.iter_globals()
|
|
|
|
|
|
PyGlobals("py-globals")
|
|
|
|
|
|
class PyNameEquals(gdb.Function):
|
|
|
|
def _get_pycurframe_attr(self, attr):
|
|
frame = Frame(gdb.selected_frame())
|
|
if frame.is_evalframeex():
|
|
pyframe = frame.get_pyop()
|
|
if pyframe is None:
|
|
warnings.warn("Use a Python debug build, Python breakpoints "
|
|
"won't work otherwise.")
|
|
return None
|
|
|
|
return getattr(pyframe, attr).proxyval(set())
|
|
|
|
return None
|
|
|
|
def invoke(self, funcname):
|
|
attr = self._get_pycurframe_attr('co_name')
|
|
return attr is not None and attr == funcname.string()
|
|
|
|
PyNameEquals("pyname_equals")
|
|
|
|
|
|
class PyModEquals(PyNameEquals):
|
|
|
|
def invoke(self, modname):
|
|
attr = self._get_pycurframe_attr('co_filename')
|
|
if attr is not None:
|
|
filename, ext = os.path.splitext(os.path.basename(attr))
|
|
return filename == modname.string()
|
|
return False
|
|
|
|
PyModEquals("pymod_equals")
|
|
|
|
|
|
class PyBreak(gdb.Command):
|
|
"""
|
|
Set a Python breakpoint. Examples:
|
|
|
|
Break on any function or method named 'func' in module 'modname'
|
|
|
|
py-break modname.func
|
|
|
|
Break on any function or method named 'func'
|
|
|
|
py-break func
|
|
"""
|
|
|
|
def invoke(self, funcname, from_tty):
|
|
if '.' in funcname:
|
|
modname, dot, funcname = funcname.rpartition('.')
|
|
cond = '$pyname_equals("%s") && $pymod_equals("%s")' % (funcname,
|
|
modname)
|
|
else:
|
|
cond = '$pyname_equals("%s")' % funcname
|
|
|
|
gdb.execute('break PyEval_EvalFrameEx if ' + cond)
|
|
|
|
PyBreak("py-break", gdb.COMMAND_RUNNING, gdb.COMPLETE_NONE)
|
|
|
|
|
|
class _LoggingState(object):
|
|
"""
|
|
State that helps to provide a reentrant gdb.execute() function.
|
|
"""
|
|
|
|
def __init__(self):
|
|
f = tempfile.NamedTemporaryFile('r+')
|
|
self.file = f
|
|
self.filename = f.name
|
|
self.fd = f.fileno()
|
|
_execute("set logging file %s" % self.filename)
|
|
self.file_position_stack = []
|
|
|
|
def __enter__(self):
|
|
if not self.file_position_stack:
|
|
_execute("set logging redirect on")
|
|
_execute("set logging on")
|
|
_execute("set pagination off")
|
|
|
|
self.file_position_stack.append(os.fstat(self.fd).st_size)
|
|
return self
|
|
|
|
def getoutput(self):
|
|
gdb.flush()
|
|
self.file.seek(self.file_position_stack[-1])
|
|
result = self.file.read()
|
|
return result
|
|
|
|
def __exit__(self, exc_type, exc_val, tb):
|
|
startpos = self.file_position_stack.pop()
|
|
self.file.seek(startpos)
|
|
self.file.truncate()
|
|
if not self.file_position_stack:
|
|
_execute("set logging off")
|
|
_execute("set logging redirect off")
|
|
_execute("set pagination on")
|
|
|
|
|
|
def execute(command, from_tty=False, to_string=False):
|
|
"""
|
|
Replace gdb.execute() with this function and have it accept a 'to_string'
|
|
argument (new in 7.2). Have it properly capture stderr also. Ensure
|
|
reentrancy.
|
|
"""
|
|
if to_string:
|
|
with _logging_state as state:
|
|
_execute(command, from_tty)
|
|
return state.getoutput()
|
|
else:
|
|
_execute(command, from_tty)
|
|
|
|
|
|
_execute = gdb.execute
|
|
gdb.execute = execute
|
|
_logging_state = _LoggingState()
|
|
|
|
|
|
def get_selected_inferior():
|
|
"""
|
|
Return the selected inferior in gdb.
|
|
"""
|
|
# Woooh, another bug in gdb! Is there an end in sight?
|
|
# http://sourceware.org/bugzilla/show_bug.cgi?id=12212
|
|
return gdb.inferiors()[0]
|
|
|
|
selected_thread = gdb.selected_thread()
|
|
|
|
for inferior in gdb.inferiors():
|
|
for thread in inferior.threads():
|
|
if thread == selected_thread:
|
|
return inferior
|
|
|
|
|
|
def source_gdb_script(script_contents, to_string=False):
|
|
"""
|
|
Source a gdb script with script_contents passed as a string. This is useful
|
|
to provide defines for py-step and py-next to make them repeatable (this is
|
|
not possible with gdb.execute()). See
|
|
http://sourceware.org/bugzilla/show_bug.cgi?id=12216
|
|
"""
|
|
fd, filename = tempfile.mkstemp()
|
|
f = os.fdopen(fd, 'w')
|
|
f.write(script_contents)
|
|
f.close()
|
|
gdb.execute("source %s" % filename, to_string=to_string)
|
|
os.remove(filename)
|
|
|
|
|
|
def register_defines():
|
|
source_gdb_script(textwrap.dedent("""\
|
|
define py-step
|
|
-py-step
|
|
end
|
|
|
|
define py-next
|
|
-py-next
|
|
end
|
|
|
|
document py-step
|
|
%s
|
|
end
|
|
|
|
document py-next
|
|
%s
|
|
end
|
|
""") % (PyStep.__doc__, PyNext.__doc__))
|
|
|
|
|
|
def stackdepth(frame):
|
|
"Tells the stackdepth of a gdb frame."
|
|
depth = 0
|
|
while frame:
|
|
frame = frame.older()
|
|
depth += 1
|
|
|
|
return depth
|
|
|
|
|
|
class ExecutionControlCommandBase(gdb.Command):
|
|
"""
|
|
Superclass for language specific execution control. Language specific
|
|
features should be implemented by lang_info using the LanguageInfo
|
|
interface. 'name' is the name of the command.
|
|
"""
|
|
|
|
def __init__(self, name, lang_info):
|
|
super(ExecutionControlCommandBase, self).__init__(
|
|
name, gdb.COMMAND_RUNNING, gdb.COMPLETE_NONE)
|
|
self.lang_info = lang_info
|
|
|
|
def install_breakpoints(self):
|
|
all_locations = itertools.chain(
|
|
self.lang_info.static_break_functions(),
|
|
self.lang_info.runtime_break_functions())
|
|
|
|
for location in all_locations:
|
|
result = gdb.execute('break %s' % location, to_string=True)
|
|
yield re.search(r'Breakpoint (\d+)', result).group(1)
|
|
|
|
def delete_breakpoints(self, breakpoint_list):
|
|
for bp in breakpoint_list:
|
|
gdb.execute("delete %s" % bp)
|
|
|
|
def filter_output(self, result):
|
|
reflags = re.MULTILINE
|
|
|
|
output_on_halt = [
|
|
(r'^Program received signal .*', reflags|re.DOTALL),
|
|
(r'.*[Ww]arning.*', 0),
|
|
(r'^Program exited .*', reflags),
|
|
]
|
|
|
|
output_always = [
|
|
# output when halting on a watchpoint
|
|
(r'^(Old|New) value = .*', reflags),
|
|
# output from the 'display' command
|
|
(r'^\d+: \w+ = .*', reflags),
|
|
]
|
|
|
|
def filter_output(regexes):
|
|
output = []
|
|
for regex, flags in regexes:
|
|
for match in re.finditer(regex, result, flags):
|
|
output.append(match.group(0))
|
|
|
|
return '\n'.join(output)
|
|
|
|
# Filter the return value output of the 'finish' command
|
|
match_finish = re.search(r'^Value returned is \$\d+ = (.*)', result,
|
|
re.MULTILINE)
|
|
if match_finish:
|
|
finish_output = 'Value returned: %s\n' % match_finish.group(1)
|
|
else:
|
|
finish_output = ''
|
|
|
|
return (filter_output(output_on_halt),
|
|
finish_output + filter_output(output_always))
|
|
|
|
def stopped(self):
|
|
return get_selected_inferior().pid == 0
|
|
|
|
def finish_executing(self, result):
|
|
"""
|
|
After doing some kind of code running in the inferior, print the line
|
|
of source code or the result of the last executed gdb command (passed
|
|
in as the `result` argument).
|
|
"""
|
|
output_on_halt, output_always = self.filter_output(result)
|
|
|
|
if self.stopped():
|
|
print(output_always)
|
|
print(output_on_halt)
|
|
else:
|
|
frame = gdb.selected_frame()
|
|
source_line = self.lang_info.get_source_line(frame)
|
|
if self.lang_info.is_relevant_function(frame):
|
|
raised_exception = self.lang_info.exc_info(frame)
|
|
if raised_exception:
|
|
print(raised_exception)
|
|
|
|
if source_line:
|
|
if output_always.rstrip():
|
|
print(output_always.rstrip())
|
|
print(source_line)
|
|
else:
|
|
print(result)
|
|
|
|
def _finish(self):
|
|
"""
|
|
Execute until the function returns (or until something else makes it
|
|
stop)
|
|
"""
|
|
if gdb.selected_frame().older() is not None:
|
|
return gdb.execute('finish', to_string=True)
|
|
else:
|
|
# outermost frame, continue
|
|
return gdb.execute('cont', to_string=True)
|
|
|
|
def _finish_frame(self):
|
|
"""
|
|
Execute until the function returns to a relevant caller.
|
|
"""
|
|
while True:
|
|
result = self._finish()
|
|
|
|
try:
|
|
frame = gdb.selected_frame()
|
|
except RuntimeError:
|
|
break
|
|
|
|
hitbp = re.search(r'Breakpoint (\d+)', result)
|
|
is_relevant = self.lang_info.is_relevant_function(frame)
|
|
if hitbp or is_relevant or self.stopped():
|
|
break
|
|
|
|
return result
|
|
|
|
def finish(self, *args):
|
|
"Implements the finish command."
|
|
result = self._finish_frame()
|
|
self.finish_executing(result)
|
|
|
|
def step(self, stepinto, stepover_command='next'):
|
|
"""
|
|
Do a single step or step-over. Returns the result of the last gdb
|
|
command that made execution stop.
|
|
|
|
This implementation, for stepping, sets (conditional) breakpoints for
|
|
all functions that are deemed relevant. It then does a step over until
|
|
either something halts execution, or until the next line is reached.
|
|
|
|
If, however, stepover_command is given, it should be a string gdb
|
|
command that continues execution in some way. The idea is that the
|
|
caller has set a (conditional) breakpoint or watchpoint that can work
|
|
more efficiently than the step-over loop. For Python this means setting
|
|
a watchpoint for f->f_lasti, which means we can then subsequently
|
|
"finish" frames.
|
|
We want f->f_lasti instead of f->f_lineno, because the latter only
|
|
works properly with local trace functions, see
|
|
PyFrameObjectPtr.current_line_num and PyFrameObjectPtr.addr2line.
|
|
"""
|
|
if stepinto:
|
|
breakpoint_list = list(self.install_breakpoints())
|
|
|
|
beginframe = gdb.selected_frame()
|
|
|
|
if self.lang_info.is_relevant_function(beginframe):
|
|
# If we start in a relevant frame, initialize stuff properly. If
|
|
# we don't start in a relevant frame, the loop will halt
|
|
# immediately. So don't call self.lang_info.lineno() as it may
|
|
# raise for irrelevant frames.
|
|
beginline = self.lang_info.lineno(beginframe)
|
|
|
|
if not stepinto:
|
|
depth = stackdepth(beginframe)
|
|
|
|
newframe = beginframe
|
|
|
|
while True:
|
|
if self.lang_info.is_relevant_function(newframe):
|
|
result = gdb.execute(stepover_command, to_string=True)
|
|
else:
|
|
result = self._finish_frame()
|
|
|
|
if self.stopped():
|
|
break
|
|
|
|
newframe = gdb.selected_frame()
|
|
is_relevant_function = self.lang_info.is_relevant_function(newframe)
|
|
try:
|
|
framename = newframe.name()
|
|
except RuntimeError:
|
|
framename = None
|
|
|
|
m = re.search(r'Breakpoint (\d+)', result)
|
|
if m:
|
|
if is_relevant_function and m.group(1) in breakpoint_list:
|
|
# although we hit a breakpoint, we still need to check
|
|
# that the function, in case hit by a runtime breakpoint,
|
|
# is in the right context
|
|
break
|
|
|
|
if newframe != beginframe:
|
|
# new function
|
|
|
|
if not stepinto:
|
|
# see if we returned to the caller
|
|
newdepth = stackdepth(newframe)
|
|
is_relevant_function = (newdepth < depth and
|
|
is_relevant_function)
|
|
|
|
if is_relevant_function:
|
|
break
|
|
else:
|
|
# newframe equals beginframe, check for a difference in the
|
|
# line number
|
|
lineno = self.lang_info.lineno(newframe)
|
|
if lineno and lineno != beginline:
|
|
break
|
|
|
|
if stepinto:
|
|
self.delete_breakpoints(breakpoint_list)
|
|
|
|
self.finish_executing(result)
|
|
|
|
def run(self, args, from_tty):
|
|
self.finish_executing(gdb.execute('run ' + args, to_string=True))
|
|
|
|
def cont(self, *args):
|
|
self.finish_executing(gdb.execute('cont', to_string=True))
|
|
|
|
|
|
class LanguageInfo(object):
|
|
"""
|
|
This class defines the interface that ExecutionControlCommandBase needs to
|
|
provide language-specific execution control.
|
|
|
|
Classes that implement this interface should implement:
|
|
|
|
lineno(frame)
|
|
Tells the current line number (only called for a relevant frame).
|
|
If lineno is a false value it is not checked for a difference.
|
|
|
|
is_relevant_function(frame)
|
|
tells whether we care about frame 'frame'
|
|
|
|
get_source_line(frame)
|
|
get the line of source code for the current line (only called for a
|
|
relevant frame). If the source code cannot be retrieved this
|
|
function should return None
|
|
|
|
exc_info(frame) -- optional
|
|
tells whether an exception was raised, if so, it should return a
|
|
string representation of the exception value, None otherwise.
|
|
|
|
static_break_functions()
|
|
returns an iterable of function names that are considered relevant
|
|
and should halt step-into execution. This is needed to provide a
|
|
performing step-into
|
|
|
|
runtime_break_functions() -- optional
|
|
list of functions that we should break into depending on the
|
|
context
|
|
"""
|
|
|
|
def exc_info(self, frame):
|
|
"See this class' docstring."
|
|
|
|
def runtime_break_functions(self):
|
|
"""
|
|
Implement this if the list of step-into functions depends on the
|
|
context.
|
|
"""
|
|
return ()
|
|
|
|
|
|
class PythonInfo(LanguageInfo):
|
|
|
|
def pyframe(self, frame):
|
|
pyframe = Frame(frame).get_pyop()
|
|
if pyframe:
|
|
return pyframe
|
|
else:
|
|
raise gdb.RuntimeError(
|
|
"Unable to find the Python frame, run your code with a debug "
|
|
"build (configure with --with-pydebug or compile with -g).")
|
|
|
|
def lineno(self, frame):
|
|
return self.pyframe(frame).current_line_num()
|
|
|
|
def is_relevant_function(self, frame):
|
|
return Frame(frame).is_evalframeex()
|
|
|
|
def get_source_line(self, frame):
|
|
try:
|
|
pyframe = self.pyframe(frame)
|
|
return '%4d %s' % (pyframe.current_line_num(),
|
|
pyframe.current_line().rstrip())
|
|
except IOError:
|
|
return None
|
|
|
|
def exc_info(self, frame):
|
|
try:
|
|
tstate = frame.read_var('tstate').dereference()
|
|
if gdb.parse_and_eval('tstate->frame == f'):
|
|
# tstate local variable initialized, check for an exception
|
|
inf_type = tstate['curexc_type']
|
|
inf_value = tstate['curexc_value']
|
|
|
|
if inf_type:
|
|
return 'An exception was raised: %s' % (inf_value,)
|
|
except (ValueError, RuntimeError):
|
|
# Could not read the variable tstate or it's memory, it's ok
|
|
pass
|
|
|
|
def static_break_functions(self):
|
|
yield 'PyEval_EvalFrameEx'
|
|
|
|
|
|
class PythonStepperMixin(object):
|
|
"""
|
|
Make this a mixin so CyStep can also inherit from this and use a
|
|
CythonCodeStepper at the same time.
|
|
"""
|
|
|
|
def python_step(self, stepinto):
|
|
"""
|
|
Set a watchpoint on the Python bytecode instruction pointer and try
|
|
to finish the frame
|
|
"""
|
|
output = gdb.execute('watch f->f_lasti', to_string=True)
|
|
watchpoint = int(re.search(r'[Ww]atchpoint (\d+):', output).group(1))
|
|
self.step(stepinto=stepinto, stepover_command='finish')
|
|
gdb.execute('delete %s' % watchpoint)
|
|
|
|
|
|
class PyStep(ExecutionControlCommandBase, PythonStepperMixin):
|
|
"Step through Python code."
|
|
|
|
stepinto = True
|
|
|
|
def invoke(self, args, from_tty):
|
|
self.python_step(stepinto=self.stepinto)
|
|
|
|
|
|
class PyNext(PyStep):
|
|
"Step-over Python code."
|
|
|
|
stepinto = False
|
|
|
|
|
|
class PyFinish(ExecutionControlCommandBase):
|
|
"Execute until function returns to a caller."
|
|
|
|
invoke = ExecutionControlCommandBase.finish
|
|
|
|
|
|
class PyRun(ExecutionControlCommandBase):
|
|
"Run the program."
|
|
|
|
invoke = ExecutionControlCommandBase.run
|
|
|
|
|
|
class PyCont(ExecutionControlCommandBase):
|
|
|
|
invoke = ExecutionControlCommandBase.cont
|
|
|
|
|
|
def _pointervalue(gdbval):
|
|
"""
|
|
Return the value of the pointer as a Python int.
|
|
|
|
gdbval.type must be a pointer type
|
|
"""
|
|
# don't convert with int() as it will raise a RuntimeError
|
|
if gdbval.address is not None:
|
|
return int(gdbval.address)
|
|
else:
|
|
# the address attribute is None sometimes, in which case we can
|
|
# still convert the pointer to an int
|
|
return int(gdbval)
|
|
|
|
|
|
def pointervalue(gdbval):
|
|
pointer = _pointervalue(gdbval)
|
|
try:
|
|
if pointer < 0:
|
|
raise gdb.GdbError("Negative pointer value, presumably a bug "
|
|
"in gdb, aborting.")
|
|
except RuntimeError:
|
|
# work around yet another bug in gdb where you get random behaviour
|
|
# and tracebacks
|
|
pass
|
|
|
|
return pointer
|
|
|
|
|
|
def get_inferior_unicode_postfix():
|
|
try:
|
|
gdb.parse_and_eval('PyUnicode_FromEncodedObject')
|
|
except RuntimeError:
|
|
try:
|
|
gdb.parse_and_eval('PyUnicodeUCS2_FromEncodedObject')
|
|
except RuntimeError:
|
|
return 'UCS4'
|
|
else:
|
|
return 'UCS2'
|
|
else:
|
|
return ''
|
|
|
|
|
|
class PythonCodeExecutor(object):
|
|
|
|
Py_single_input = 256
|
|
Py_file_input = 257
|
|
Py_eval_input = 258
|
|
|
|
def malloc(self, size):
|
|
chunk = (gdb.parse_and_eval("(void *) malloc((size_t) %d)" % size))
|
|
|
|
pointer = pointervalue(chunk)
|
|
if pointer == 0:
|
|
raise gdb.GdbError("No memory could be allocated in the inferior.")
|
|
|
|
return pointer
|
|
|
|
def alloc_string(self, string):
|
|
pointer = self.malloc(len(string))
|
|
get_selected_inferior().write_memory(pointer, string)
|
|
|
|
return pointer
|
|
|
|
def alloc_pystring(self, string):
|
|
stringp = self.alloc_string(string)
|
|
PyString_FromStringAndSize = 'PyString_FromStringAndSize'
|
|
|
|
try:
|
|
gdb.parse_and_eval(PyString_FromStringAndSize)
|
|
except RuntimeError:
|
|
# Python 3
|
|
PyString_FromStringAndSize = ('PyUnicode%s_FromStringAndSize' %
|
|
(get_inferior_unicode_postfix(),))
|
|
|
|
try:
|
|
result = gdb.parse_and_eval(
|
|
'(PyObject *) %s((char *) %d, (size_t) %d)' % (
|
|
PyString_FromStringAndSize, stringp, len(string)))
|
|
finally:
|
|
self.free(stringp)
|
|
|
|
pointer = pointervalue(result)
|
|
if pointer == 0:
|
|
raise gdb.GdbError("Unable to allocate Python string in "
|
|
"the inferior.")
|
|
|
|
return pointer
|
|
|
|
def free(self, pointer):
|
|
gdb.parse_and_eval("free((void *) %d)" % pointer)
|
|
|
|
def incref(self, pointer):
|
|
"Increment the reference count of a Python object in the inferior."
|
|
gdb.parse_and_eval('Py_IncRef((PyObject *) %d)' % pointer)
|
|
|
|
def xdecref(self, pointer):
|
|
"Decrement the reference count of a Python object in the inferior."
|
|
# Py_DecRef is like Py_XDECREF, but a function. So we don't have
|
|
# to check for NULL. This should also decref all our allocated
|
|
# Python strings.
|
|
gdb.parse_and_eval('Py_DecRef((PyObject *) %d)' % pointer)
|
|
|
|
def evalcode(self, code, input_type, global_dict=None, local_dict=None):
|
|
"""
|
|
Evaluate python code `code` given as a string in the inferior and
|
|
return the result as a gdb.Value. Returns a new reference in the
|
|
inferior.
|
|
|
|
Of course, executing any code in the inferior may be dangerous and may
|
|
leave the debuggee in an unsafe state or terminate it altogether.
|
|
"""
|
|
if '\0' in code:
|
|
raise gdb.GdbError("String contains NUL byte.")
|
|
|
|
code += '\0'
|
|
|
|
pointer = self.alloc_string(code)
|
|
|
|
globalsp = pointervalue(global_dict)
|
|
localsp = pointervalue(local_dict)
|
|
|
|
if globalsp == 0 or localsp == 0:
|
|
raise gdb.GdbError("Unable to obtain or create locals or globals.")
|
|
|
|
code = """
|
|
PyRun_String(
|
|
(char *) %(code)d,
|
|
(int) %(start)d,
|
|
(PyObject *) %(globals)s,
|
|
(PyObject *) %(locals)d)
|
|
""" % dict(code=pointer, start=input_type,
|
|
globals=globalsp, locals=localsp)
|
|
|
|
with FetchAndRestoreError():
|
|
try:
|
|
pyobject_return_value = gdb.parse_and_eval(code)
|
|
finally:
|
|
self.free(pointer)
|
|
|
|
return pyobject_return_value
|
|
|
|
|
|
class FetchAndRestoreError(PythonCodeExecutor):
|
|
"""
|
|
Context manager that fetches the error indicator in the inferior and
|
|
restores it on exit.
|
|
"""
|
|
|
|
def __init__(self):
|
|
self.sizeof_PyObjectPtr = gdb.lookup_type('PyObject').pointer().sizeof
|
|
self.pointer = self.malloc(self.sizeof_PyObjectPtr * 3)
|
|
|
|
type = self.pointer
|
|
value = self.pointer + self.sizeof_PyObjectPtr
|
|
traceback = self.pointer + self.sizeof_PyObjectPtr * 2
|
|
|
|
self.errstate = type, value, traceback
|
|
|
|
def __enter__(self):
|
|
gdb.parse_and_eval("PyErr_Fetch(%d, %d, %d)" % self.errstate)
|
|
|
|
def __exit__(self, *args):
|
|
if gdb.parse_and_eval("(int) PyErr_Occurred()"):
|
|
gdb.parse_and_eval("PyErr_Print()")
|
|
|
|
pyerr_restore = ("PyErr_Restore("
|
|
"(PyObject *) *%d,"
|
|
"(PyObject *) *%d,"
|
|
"(PyObject *) *%d)")
|
|
|
|
try:
|
|
gdb.parse_and_eval(pyerr_restore % self.errstate)
|
|
finally:
|
|
self.free(self.pointer)
|
|
|
|
|
|
class FixGdbCommand(gdb.Command):
|
|
|
|
def __init__(self, command, actual_command):
|
|
super(FixGdbCommand, self).__init__(command, gdb.COMMAND_DATA,
|
|
gdb.COMPLETE_NONE)
|
|
self.actual_command = actual_command
|
|
|
|
def fix_gdb(self):
|
|
"""
|
|
It seems that invoking either 'cy exec' and 'py-exec' work perfectly
|
|
fine, but after this gdb's python API is entirely broken.
|
|
Maybe some uncleared exception value is still set?
|
|
sys.exc_clear() didn't help. A demonstration:
|
|
|
|
(gdb) cy exec 'hello'
|
|
'hello'
|
|
(gdb) python gdb.execute('cont')
|
|
RuntimeError: Cannot convert value to int.
|
|
Error while executing Python code.
|
|
(gdb) python gdb.execute('cont')
|
|
[15148 refs]
|
|
|
|
Program exited normally.
|
|
"""
|
|
warnings.filterwarnings('ignore', r'.*', RuntimeWarning,
|
|
re.escape(__name__))
|
|
try:
|
|
int(gdb.parse_and_eval("(void *) 0")) == 0
|
|
except RuntimeError:
|
|
pass
|
|
# warnings.resetwarnings()
|
|
|
|
def invoke(self, args, from_tty):
|
|
self.fix_gdb()
|
|
try:
|
|
gdb.execute('%s %s' % (self.actual_command, args))
|
|
except RuntimeError as e:
|
|
raise gdb.GdbError(str(e))
|
|
self.fix_gdb()
|
|
|
|
|
|
def _evalcode_python(executor, code, input_type):
|
|
"""
|
|
Execute Python code in the most recent stack frame.
|
|
"""
|
|
global_dict = gdb.parse_and_eval('PyEval_GetGlobals()')
|
|
local_dict = gdb.parse_and_eval('PyEval_GetLocals()')
|
|
|
|
if (pointervalue(global_dict) == 0 or pointervalue(local_dict) == 0):
|
|
raise gdb.GdbError("Unable to find the locals or globals of the "
|
|
"most recent Python function (relative to the "
|
|
"selected frame).")
|
|
|
|
return executor.evalcode(code, input_type, global_dict, local_dict)
|
|
|
|
|
|
class PyExec(gdb.Command):
|
|
|
|
def readcode(self, expr):
|
|
if expr:
|
|
return expr, PythonCodeExecutor.Py_single_input
|
|
else:
|
|
lines = []
|
|
while True:
|
|
try:
|
|
line = input('>')
|
|
except EOFError:
|
|
break
|
|
else:
|
|
if line.rstrip() == 'end':
|
|
break
|
|
|
|
lines.append(line)
|
|
|
|
return '\n'.join(lines), PythonCodeExecutor.Py_file_input
|
|
|
|
def invoke(self, expr, from_tty):
|
|
expr, input_type = self.readcode(expr)
|
|
executor = PythonCodeExecutor()
|
|
executor.xdecref(_evalcode_python(executor, input_type, global_dict, local_dict))
|
|
|
|
|
|
gdb.execute('set breakpoint pending on')
|
|
|
|
if hasattr(gdb, 'GdbError'):
|
|
# Wrap py-step and py-next in gdb defines to make them repeatable.
|
|
py_step = PyStep('-py-step', PythonInfo())
|
|
py_next = PyNext('-py-next', PythonInfo())
|
|
register_defines()
|
|
py_finish = PyFinish('py-finish', PythonInfo())
|
|
py_run = PyRun('py-run', PythonInfo())
|
|
py_cont = PyCont('py-cont', PythonInfo())
|
|
|
|
py_exec = FixGdbCommand('py-exec', '-py-exec')
|
|
_py_exec = PyExec("-py-exec", gdb.COMMAND_DATA, gdb.COMPLETE_NONE)
|
|
else:
|
|
warnings.warn("Use gdb 7.2 or higher to use the py-exec command.")
|