mirror of
https://github.com/python/cpython.git
synced 2024-11-24 18:34:43 +08:00
9d7b2c0909
* Properly handle SyntaxErrors in Python source files. SyntaxErrors in the target module will rise normally, while SyntaxErrors in dependencies will be added to badmodules. This includes a new regression test. * Fix name collision bug. This fixes an issue where a "fromlist" import with the same name as a previously failed import would be incorrectly added to badmodules. This includes a new regression test. * Replace mutable default values. Bound empty lists have been replaced with the "if param is None" idiom. * Replace deprecated imp usage. Constants imported from imp have been moved to private module-level constants, and ModuleFinder.find_module has been refactored to use importlib. Other than an improvement on how frozen builtin imports are reported (as the frozen imports they are, rather than the stdlib modules they *may* have originated from), these changes maintain complete compatibility with past versions... including odd behavior for returning relative (below current directory, but not a C extension) vs. absolute (above current directory, or a C extension) paths. Patch by Brandt Bucher.
694 lines
24 KiB
Python
694 lines
24 KiB
Python
"""Find modules used by a script, using introspection."""
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import dis
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import importlib._bootstrap_external
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import importlib.machinery
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import marshal
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import os
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import sys
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import types
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import warnings
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LOAD_CONST = dis.opmap['LOAD_CONST']
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IMPORT_NAME = dis.opmap['IMPORT_NAME']
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STORE_NAME = dis.opmap['STORE_NAME']
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STORE_GLOBAL = dis.opmap['STORE_GLOBAL']
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STORE_OPS = STORE_NAME, STORE_GLOBAL
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EXTENDED_ARG = dis.EXTENDED_ARG
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# Old imp constants:
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_SEARCH_ERROR = 0
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_PY_SOURCE = 1
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_PY_COMPILED = 2
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_C_EXTENSION = 3
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_PKG_DIRECTORY = 5
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_C_BUILTIN = 6
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_PY_FROZEN = 7
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# Modulefinder does a good job at simulating Python's, but it can not
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# handle __path__ modifications packages make at runtime. Therefore there
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# is a mechanism whereby you can register extra paths in this map for a
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# package, and it will be honored.
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# Note this is a mapping is lists of paths.
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packagePathMap = {}
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# A Public interface
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def AddPackagePath(packagename, path):
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packagePathMap.setdefault(packagename, []).append(path)
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replacePackageMap = {}
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# This ReplacePackage mechanism allows modulefinder to work around
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# situations in which a package injects itself under the name
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# of another package into sys.modules at runtime by calling
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# ReplacePackage("real_package_name", "faked_package_name")
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# before running ModuleFinder.
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def ReplacePackage(oldname, newname):
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replacePackageMap[oldname] = newname
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def _find_module(name, path=None):
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"""An importlib reimplementation of imp.find_module (for our purposes)."""
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# It's necessary to clear the caches for our Finder first, in case any
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# modules are being added/deleted/modified at runtime. In particular,
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# test_modulefinder.py changes file tree contents in a cache-breaking way:
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importlib.machinery.PathFinder.invalidate_caches()
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spec = importlib.machinery.PathFinder.find_spec(name, path)
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if spec is None:
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raise ImportError("No module named {name!r}".format(name=name), name=name)
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# Some special cases:
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if spec.loader is importlib.machinery.BuiltinImporter:
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return None, None, ("", "", _C_BUILTIN)
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if spec.loader is importlib.machinery.FrozenImporter:
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return None, None, ("", "", _PY_FROZEN)
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file_path = spec.origin
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if spec.loader.is_package(name):
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return None, os.path.dirname(file_path), ("", "", _PKG_DIRECTORY)
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if isinstance(spec.loader, importlib.machinery.SourceFileLoader):
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kind = _PY_SOURCE
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mode = "r"
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elif isinstance(spec.loader, importlib.machinery.ExtensionFileLoader):
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kind = _C_EXTENSION
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mode = "rb"
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elif isinstance(spec.loader, importlib.machinery.SourcelessFileLoader):
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kind = _PY_COMPILED
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mode = "rb"
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else: # Should never happen.
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return None, None, ("", "", _SEARCH_ERROR)
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file = open(file_path, mode)
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suffix = os.path.splitext(file_path)[-1]
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return file, file_path, (suffix, mode, kind)
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class Module:
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def __init__(self, name, file=None, path=None):
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self.__name__ = name
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self.__file__ = file
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self.__path__ = path
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self.__code__ = None
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# The set of global names that are assigned to in the module.
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# This includes those names imported through starimports of
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# Python modules.
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self.globalnames = {}
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# The set of starimports this module did that could not be
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# resolved, ie. a starimport from a non-Python module.
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self.starimports = {}
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def __repr__(self):
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s = "Module(%r" % (self.__name__,)
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if self.__file__ is not None:
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s = s + ", %r" % (self.__file__,)
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if self.__path__ is not None:
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s = s + ", %r" % (self.__path__,)
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s = s + ")"
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return s
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class ModuleFinder:
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def __init__(self, path=None, debug=0, excludes=None, replace_paths=None):
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if path is None:
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path = sys.path
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self.path = path
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self.modules = {}
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self.badmodules = {}
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self.debug = debug
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self.indent = 0
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self.excludes = excludes if excludes is not None else []
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self.replace_paths = replace_paths if replace_paths is not None else []
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self.processed_paths = [] # Used in debugging only
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def msg(self, level, str, *args):
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if level <= self.debug:
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for i in range(self.indent):
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print(" ", end=' ')
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print(str, end=' ')
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for arg in args:
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print(repr(arg), end=' ')
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print()
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def msgin(self, *args):
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level = args[0]
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if level <= self.debug:
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self.indent = self.indent + 1
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self.msg(*args)
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def msgout(self, *args):
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level = args[0]
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if level <= self.debug:
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self.indent = self.indent - 1
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self.msg(*args)
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def run_script(self, pathname):
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self.msg(2, "run_script", pathname)
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with open(pathname) as fp:
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stuff = ("", "r", _PY_SOURCE)
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self.load_module('__main__', fp, pathname, stuff)
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def load_file(self, pathname):
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dir, name = os.path.split(pathname)
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name, ext = os.path.splitext(name)
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with open(pathname) as fp:
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stuff = (ext, "r", _PY_SOURCE)
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self.load_module(name, fp, pathname, stuff)
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def import_hook(self, name, caller=None, fromlist=None, level=-1):
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self.msg(3, "import_hook", name, caller, fromlist, level)
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parent = self.determine_parent(caller, level=level)
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q, tail = self.find_head_package(parent, name)
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m = self.load_tail(q, tail)
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if not fromlist:
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return q
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if m.__path__:
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self.ensure_fromlist(m, fromlist)
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return None
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def determine_parent(self, caller, level=-1):
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self.msgin(4, "determine_parent", caller, level)
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if not caller or level == 0:
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self.msgout(4, "determine_parent -> None")
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return None
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pname = caller.__name__
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if level >= 1: # relative import
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if caller.__path__:
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level -= 1
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if level == 0:
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parent = self.modules[pname]
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assert parent is caller
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self.msgout(4, "determine_parent ->", parent)
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return parent
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if pname.count(".") < level:
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raise ImportError("relative importpath too deep")
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pname = ".".join(pname.split(".")[:-level])
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parent = self.modules[pname]
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self.msgout(4, "determine_parent ->", parent)
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return parent
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if caller.__path__:
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parent = self.modules[pname]
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assert caller is parent
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self.msgout(4, "determine_parent ->", parent)
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return parent
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if '.' in pname:
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i = pname.rfind('.')
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pname = pname[:i]
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parent = self.modules[pname]
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assert parent.__name__ == pname
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self.msgout(4, "determine_parent ->", parent)
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return parent
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self.msgout(4, "determine_parent -> None")
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return None
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def find_head_package(self, parent, name):
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self.msgin(4, "find_head_package", parent, name)
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if '.' in name:
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i = name.find('.')
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head = name[:i]
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tail = name[i+1:]
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else:
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head = name
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tail = ""
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if parent:
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qname = "%s.%s" % (parent.__name__, head)
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else:
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qname = head
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q = self.import_module(head, qname, parent)
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if q:
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self.msgout(4, "find_head_package ->", (q, tail))
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return q, tail
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if parent:
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qname = head
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parent = None
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q = self.import_module(head, qname, parent)
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if q:
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self.msgout(4, "find_head_package ->", (q, tail))
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return q, tail
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self.msgout(4, "raise ImportError: No module named", qname)
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raise ImportError("No module named " + qname)
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def load_tail(self, q, tail):
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self.msgin(4, "load_tail", q, tail)
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m = q
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while tail:
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i = tail.find('.')
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if i < 0: i = len(tail)
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head, tail = tail[:i], tail[i+1:]
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mname = "%s.%s" % (m.__name__, head)
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m = self.import_module(head, mname, m)
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if not m:
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self.msgout(4, "raise ImportError: No module named", mname)
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raise ImportError("No module named " + mname)
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self.msgout(4, "load_tail ->", m)
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return m
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def ensure_fromlist(self, m, fromlist, recursive=0):
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self.msg(4, "ensure_fromlist", m, fromlist, recursive)
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for sub in fromlist:
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if sub == "*":
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if not recursive:
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all = self.find_all_submodules(m)
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if all:
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self.ensure_fromlist(m, all, 1)
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elif not hasattr(m, sub):
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subname = "%s.%s" % (m.__name__, sub)
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submod = self.import_module(sub, subname, m)
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if not submod:
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raise ImportError("No module named " + subname)
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def find_all_submodules(self, m):
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if not m.__path__:
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return
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modules = {}
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# 'suffixes' used to be a list hardcoded to [".py", ".pyc"].
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# But we must also collect Python extension modules - although
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# we cannot separate normal dlls from Python extensions.
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suffixes = []
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suffixes += importlib.machinery.EXTENSION_SUFFIXES[:]
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suffixes += importlib.machinery.SOURCE_SUFFIXES[:]
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suffixes += importlib.machinery.BYTECODE_SUFFIXES[:]
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for dir in m.__path__:
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try:
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names = os.listdir(dir)
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except OSError:
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self.msg(2, "can't list directory", dir)
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continue
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for name in names:
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mod = None
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for suff in suffixes:
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n = len(suff)
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if name[-n:] == suff:
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mod = name[:-n]
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break
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if mod and mod != "__init__":
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modules[mod] = mod
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return modules.keys()
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def import_module(self, partname, fqname, parent):
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self.msgin(3, "import_module", partname, fqname, parent)
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try:
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m = self.modules[fqname]
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except KeyError:
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pass
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else:
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self.msgout(3, "import_module ->", m)
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return m
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if fqname in self.badmodules:
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self.msgout(3, "import_module -> None")
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return None
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if parent and parent.__path__ is None:
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self.msgout(3, "import_module -> None")
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return None
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try:
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fp, pathname, stuff = self.find_module(partname,
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parent and parent.__path__, parent)
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except ImportError:
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self.msgout(3, "import_module ->", None)
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return None
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try:
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m = self.load_module(fqname, fp, pathname, stuff)
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finally:
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if fp:
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fp.close()
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if parent:
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setattr(parent, partname, m)
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self.msgout(3, "import_module ->", m)
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return m
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def load_module(self, fqname, fp, pathname, file_info):
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suffix, mode, type = file_info
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self.msgin(2, "load_module", fqname, fp and "fp", pathname)
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if type == _PKG_DIRECTORY:
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m = self.load_package(fqname, pathname)
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self.msgout(2, "load_module ->", m)
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return m
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if type == _PY_SOURCE:
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co = compile(fp.read()+'\n', pathname, 'exec')
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elif type == _PY_COMPILED:
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try:
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data = fp.read()
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importlib._bootstrap_external._classify_pyc(data, fqname, {})
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except ImportError as exc:
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self.msgout(2, "raise ImportError: " + str(exc), pathname)
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raise
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co = marshal.loads(memoryview(data)[16:])
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else:
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co = None
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m = self.add_module(fqname)
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m.__file__ = pathname
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if co:
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if self.replace_paths:
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co = self.replace_paths_in_code(co)
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m.__code__ = co
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self.scan_code(co, m)
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self.msgout(2, "load_module ->", m)
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return m
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def _add_badmodule(self, name, caller):
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if name not in self.badmodules:
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self.badmodules[name] = {}
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if caller:
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self.badmodules[name][caller.__name__] = 1
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else:
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self.badmodules[name]["-"] = 1
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def _safe_import_hook(self, name, caller, fromlist, level=-1):
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# wrapper for self.import_hook() that won't raise ImportError
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if name in self.badmodules:
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self._add_badmodule(name, caller)
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return
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try:
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self.import_hook(name, caller, level=level)
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except ImportError as msg:
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self.msg(2, "ImportError:", str(msg))
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self._add_badmodule(name, caller)
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except SyntaxError as msg:
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self.msg(2, "SyntaxError:", str(msg))
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self._add_badmodule(name, caller)
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else:
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if fromlist:
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for sub in fromlist:
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fullname = name + "." + sub
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if fullname in self.badmodules:
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self._add_badmodule(fullname, caller)
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continue
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try:
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self.import_hook(name, caller, [sub], level=level)
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except ImportError as msg:
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self.msg(2, "ImportError:", str(msg))
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self._add_badmodule(fullname, caller)
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def scan_opcodes(self, co):
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# Scan the code, and yield 'interesting' opcode combinations
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code = co.co_code
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names = co.co_names
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consts = co.co_consts
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opargs = [(op, arg) for _, op, arg in dis._unpack_opargs(code)
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if op != EXTENDED_ARG]
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for i, (op, oparg) in enumerate(opargs):
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if op in STORE_OPS:
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yield "store", (names[oparg],)
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continue
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if (op == IMPORT_NAME and i >= 2
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and opargs[i-1][0] == opargs[i-2][0] == LOAD_CONST):
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level = consts[opargs[i-2][1]]
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fromlist = consts[opargs[i-1][1]]
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if level == 0: # absolute import
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yield "absolute_import", (fromlist, names[oparg])
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else: # relative import
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yield "relative_import", (level, fromlist, names[oparg])
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continue
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def scan_code(self, co, m):
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code = co.co_code
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scanner = self.scan_opcodes
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for what, args in scanner(co):
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if what == "store":
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name, = args
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m.globalnames[name] = 1
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elif what == "absolute_import":
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fromlist, name = args
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have_star = 0
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if fromlist is not None:
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if "*" in fromlist:
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have_star = 1
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fromlist = [f for f in fromlist if f != "*"]
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self._safe_import_hook(name, m, fromlist, level=0)
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if have_star:
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# We've encountered an "import *". If it is a Python module,
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# the code has already been parsed and we can suck out the
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# global names.
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mm = None
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if m.__path__:
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# At this point we don't know whether 'name' is a
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# submodule of 'm' or a global module. Let's just try
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# the full name first.
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mm = self.modules.get(m.__name__ + "." + name)
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if mm is None:
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mm = self.modules.get(name)
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if mm is not None:
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m.globalnames.update(mm.globalnames)
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m.starimports.update(mm.starimports)
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if mm.__code__ is None:
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m.starimports[name] = 1
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else:
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m.starimports[name] = 1
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elif what == "relative_import":
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level, fromlist, name = args
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if name:
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self._safe_import_hook(name, m, fromlist, level=level)
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else:
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parent = self.determine_parent(m, level=level)
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self._safe_import_hook(parent.__name__, None, fromlist, level=0)
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else:
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# We don't expect anything else from the generator.
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raise RuntimeError(what)
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for c in co.co_consts:
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if isinstance(c, type(co)):
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self.scan_code(c, m)
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def load_package(self, fqname, pathname):
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self.msgin(2, "load_package", fqname, pathname)
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newname = replacePackageMap.get(fqname)
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if newname:
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fqname = newname
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m = self.add_module(fqname)
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m.__file__ = pathname
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m.__path__ = [pathname]
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# As per comment at top of file, simulate runtime __path__ additions.
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m.__path__ = m.__path__ + packagePathMap.get(fqname, [])
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fp, buf, stuff = self.find_module("__init__", m.__path__)
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try:
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self.load_module(fqname, fp, buf, stuff)
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self.msgout(2, "load_package ->", m)
|
|
return m
|
|
finally:
|
|
if fp:
|
|
fp.close()
|
|
|
|
def add_module(self, fqname):
|
|
if fqname in self.modules:
|
|
return self.modules[fqname]
|
|
self.modules[fqname] = m = Module(fqname)
|
|
return m
|
|
|
|
def find_module(self, name, path, parent=None):
|
|
if parent is not None:
|
|
# assert path is not None
|
|
fullname = parent.__name__+'.'+name
|
|
else:
|
|
fullname = name
|
|
if fullname in self.excludes:
|
|
self.msgout(3, "find_module -> Excluded", fullname)
|
|
raise ImportError(name)
|
|
|
|
if path is None:
|
|
if name in sys.builtin_module_names:
|
|
return (None, None, ("", "", _C_BUILTIN))
|
|
|
|
path = self.path
|
|
|
|
return _find_module(name, path)
|
|
|
|
def report(self):
|
|
"""Print a report to stdout, listing the found modules with their
|
|
paths, as well as modules that are missing, or seem to be missing.
|
|
"""
|
|
print()
|
|
print(" %-25s %s" % ("Name", "File"))
|
|
print(" %-25s %s" % ("----", "----"))
|
|
# Print modules found
|
|
keys = sorted(self.modules.keys())
|
|
for key in keys:
|
|
m = self.modules[key]
|
|
if m.__path__:
|
|
print("P", end=' ')
|
|
else:
|
|
print("m", end=' ')
|
|
print("%-25s" % key, m.__file__ or "")
|
|
|
|
# Print missing modules
|
|
missing, maybe = self.any_missing_maybe()
|
|
if missing:
|
|
print()
|
|
print("Missing modules:")
|
|
for name in missing:
|
|
mods = sorted(self.badmodules[name].keys())
|
|
print("?", name, "imported from", ', '.join(mods))
|
|
# Print modules that may be missing, but then again, maybe not...
|
|
if maybe:
|
|
print()
|
|
print("Submodules that appear to be missing, but could also be", end=' ')
|
|
print("global names in the parent package:")
|
|
for name in maybe:
|
|
mods = sorted(self.badmodules[name].keys())
|
|
print("?", name, "imported from", ', '.join(mods))
|
|
|
|
def any_missing(self):
|
|
"""Return a list of modules that appear to be missing. Use
|
|
any_missing_maybe() if you want to know which modules are
|
|
certain to be missing, and which *may* be missing.
|
|
"""
|
|
missing, maybe = self.any_missing_maybe()
|
|
return missing + maybe
|
|
|
|
def any_missing_maybe(self):
|
|
"""Return two lists, one with modules that are certainly missing
|
|
and one with modules that *may* be missing. The latter names could
|
|
either be submodules *or* just global names in the package.
|
|
|
|
The reason it can't always be determined is that it's impossible to
|
|
tell which names are imported when "from module import *" is done
|
|
with an extension module, short of actually importing it.
|
|
"""
|
|
missing = []
|
|
maybe = []
|
|
for name in self.badmodules:
|
|
if name in self.excludes:
|
|
continue
|
|
i = name.rfind(".")
|
|
if i < 0:
|
|
missing.append(name)
|
|
continue
|
|
subname = name[i+1:]
|
|
pkgname = name[:i]
|
|
pkg = self.modules.get(pkgname)
|
|
if pkg is not None:
|
|
if pkgname in self.badmodules[name]:
|
|
# The package tried to import this module itself and
|
|
# failed. It's definitely missing.
|
|
missing.append(name)
|
|
elif subname in pkg.globalnames:
|
|
# It's a global in the package: definitely not missing.
|
|
pass
|
|
elif pkg.starimports:
|
|
# It could be missing, but the package did an "import *"
|
|
# from a non-Python module, so we simply can't be sure.
|
|
maybe.append(name)
|
|
else:
|
|
# It's not a global in the package, the package didn't
|
|
# do funny star imports, it's very likely to be missing.
|
|
# The symbol could be inserted into the package from the
|
|
# outside, but since that's not good style we simply list
|
|
# it missing.
|
|
missing.append(name)
|
|
else:
|
|
missing.append(name)
|
|
missing.sort()
|
|
maybe.sort()
|
|
return missing, maybe
|
|
|
|
def replace_paths_in_code(self, co):
|
|
new_filename = original_filename = os.path.normpath(co.co_filename)
|
|
for f, r in self.replace_paths:
|
|
if original_filename.startswith(f):
|
|
new_filename = r + original_filename[len(f):]
|
|
break
|
|
|
|
if self.debug and original_filename not in self.processed_paths:
|
|
if new_filename != original_filename:
|
|
self.msgout(2, "co_filename %r changed to %r" \
|
|
% (original_filename,new_filename,))
|
|
else:
|
|
self.msgout(2, "co_filename %r remains unchanged" \
|
|
% (original_filename,))
|
|
self.processed_paths.append(original_filename)
|
|
|
|
consts = list(co.co_consts)
|
|
for i in range(len(consts)):
|
|
if isinstance(consts[i], type(co)):
|
|
consts[i] = self.replace_paths_in_code(consts[i])
|
|
|
|
return types.CodeType(co.co_argcount, co.co_kwonlyargcount,
|
|
co.co_nlocals, co.co_stacksize, co.co_flags,
|
|
co.co_code, tuple(consts), co.co_names,
|
|
co.co_varnames, new_filename, co.co_name,
|
|
co.co_firstlineno, co.co_lnotab, co.co_freevars,
|
|
co.co_cellvars)
|
|
|
|
|
|
def test():
|
|
# Parse command line
|
|
import getopt
|
|
try:
|
|
opts, args = getopt.getopt(sys.argv[1:], "dmp:qx:")
|
|
except getopt.error as msg:
|
|
print(msg)
|
|
return
|
|
|
|
# Process options
|
|
debug = 1
|
|
domods = 0
|
|
addpath = []
|
|
exclude = []
|
|
for o, a in opts:
|
|
if o == '-d':
|
|
debug = debug + 1
|
|
if o == '-m':
|
|
domods = 1
|
|
if o == '-p':
|
|
addpath = addpath + a.split(os.pathsep)
|
|
if o == '-q':
|
|
debug = 0
|
|
if o == '-x':
|
|
exclude.append(a)
|
|
|
|
# Provide default arguments
|
|
if not args:
|
|
script = "hello.py"
|
|
else:
|
|
script = args[0]
|
|
|
|
# Set the path based on sys.path and the script directory
|
|
path = sys.path[:]
|
|
path[0] = os.path.dirname(script)
|
|
path = addpath + path
|
|
if debug > 1:
|
|
print("path:")
|
|
for item in path:
|
|
print(" ", repr(item))
|
|
|
|
# Create the module finder and turn its crank
|
|
mf = ModuleFinder(path, debug, exclude)
|
|
for arg in args[1:]:
|
|
if arg == '-m':
|
|
domods = 1
|
|
continue
|
|
if domods:
|
|
if arg[-2:] == '.*':
|
|
mf.import_hook(arg[:-2], None, ["*"])
|
|
else:
|
|
mf.import_hook(arg)
|
|
else:
|
|
mf.load_file(arg)
|
|
mf.run_script(script)
|
|
mf.report()
|
|
return mf # for -i debugging
|
|
|
|
|
|
if __name__ == '__main__':
|
|
try:
|
|
mf = test()
|
|
except KeyboardInterrupt:
|
|
print("\n[interrupted]")
|