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# Copyright (C) 2009 Canonical Ltd
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3 as
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# published by the Free Software Foundation.
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""The core routines for scanning python references and dumping memory info."""
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cdef extern from "stdio.h":
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size_t fwrite(void *, size_t, size_t, FILE *)
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size_t fprintf(FILE *, char *, ...)
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cdef extern from "Python.h":
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FILE *PyFile_AsFile(object)
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ctypedef struct PyGC_Head:
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object PyString_FromStringAndSize(char *, Py_ssize_t)
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cdef extern from "_scanner_core.h":
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Py_ssize_t _size_of(object c_obj)
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ctypedef void (*write_callback)(void *callee_data, char *bytes, size_t len)
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void _clear_last_dumped()
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void _dump_object_info(write_callback write, void *callee_data,
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object c_obj, object nodump, int recurse)
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object _get_referents(object c_obj)
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_word_size = sizeof(Py_ssize_t)
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_gc_head_size = sizeof(PyGC_Head)
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_unicode_size = Py_UNICODE_SIZE
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"""Compute the size of the object.
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This is the actual malloc() size for this object, so for dicts it is the
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size of the dict object, plus the size of the array of references, but
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*not* the size of each individual referenced object.
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:param obj: The object to measure
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:return: An integer of the number of bytes used by this object.
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cdef void _file_io_callback(void *callee_data, char *bytes, size_t len):
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file_cb = <FILE *>callee_data
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fwrite(bytes, 1, len, file_cb)
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cdef void _callable_callback(void *callee_data, char *bytes, size_t len):
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callable = <object>callee_data
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s = PyString_FromStringAndSize(bytes, len)
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def dump_object_info(object out, object obj, object nodump=None,
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"""Dump the object information to the given output.
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:param out: Either a File object, or a callable.
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If a File object, we will write bytes to the underlying FILE*
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Otherwise, we will call(str) with bytes as we build up the state of the
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object. Note that a single call will not be a complete description, but
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potentially a single character of the final formatted string.
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:param obj: The object to inspect
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:param nodump: If supplied, this is a set() of objects that we want to
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exclude from the dump file.
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:param recurse_depth: 0 to only dump the supplied object
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1 to dump the object and immediate neighbors that would not otherwise be
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referenced (such as strings).
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2 dump everything we find and continue recursing
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fp_out = PyFile_AsFile(out)
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# This must be a callable
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_dump_object_info(<write_callback>_file_io_callback, fp_out, obj,
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nodump, recurse_depth)
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_dump_object_info(<write_callback>_callable_callback, <void *>out, obj,
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nodump, recurse_depth)
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def get_referents(object obj):
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"""Similar to gc.get_referents()
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The main different is that gc.get_referents() only includes items that are
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in the garbage collector. However, we want anything referred to by
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return _get_referents(obj)
added
removed
meliae/_scanner.pyx
