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python
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stap-resolve-module-function.py
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/usr/libexec/systemtap/python/stap-resolve-module-function.py
(21494B)
from __future__ import print_function import ast import warnings with warnings.catch_warnings(): warnings.simplefilter("ignore") # deprecated in python 3.4, but still works as of python 3.7.6 import imp import os.path import re import sys from glob import glob _verbose = 0 # We want everything that isn't actual results to go to # stderr. _eprint() is just like print(), but all output automatically # goes to stderr. def _eprint(*args, **kwargs): print(*args, file=sys.stderr, **kwargs) def _remove_ext(fullname): return os.path.splitext(fullname)[0] _alphanum = frozenset( "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789") _regexp_chars = frozenset("*?[]") def _stapre_escape(pattern): "Escape all unallowed wildcard characters in pattern." s = list(pattern) alphanum = _alphanum for i, c in enumerate(pattern): if c not in alphanum and c not in _regexp_chars: if c == "\000": s[i] = "\\000" else: s[i] = "\\" + c for i, c in enumerate(pattern): # Convert '*' into '.*', a real regexp. if c == '*': s[i] = '[^.]*' # Convert '?' into '.', a real regexp. elif c == '?': s[i] = '.' return pattern[:0].join(s) def _stapre_name_has_wildcard(pattern): for i, c in enumerate(pattern): if c in _regexp_chars: return True return False def _get_default_search_path(): path = sys.path # The first element of sys.path is the current directory of this # script, not the user's current directory. So, insert the empty # string (standing in for the current directory) at the start of # the list. path.insert(0, '') return path def _find_wildcarded_modules(modpattern, path=None): """Version of imp.find_module() that handles hierarchical module names and wildcards. Try to find the module name. If path is omitted or None, the default search path is used. Otherwise, path must be a list of directory names; each directory is searched for files. Invalid names in the list are silently ignored (but all list items must be strings). If search is successful, the return value is a 4-element tuple (modname, file, pathname, description): modname is the module name, file is an open file object positioned at the beginning, pathname is the pathname of the file found, and description is a 3-element tuple as contained in the list returned by get_suffixes() describing the kind of module found. If the module does not live in a file, ImportError is raised. If the search is unsuccessful, ImportError is raised. Other exceptions indicate problems with the arguments or environment. If the module is a package, '__init__.py' is opened. """ global _verbose results = [] if path is None: path = _get_default_search_path() # Convert '.' to '/', since 'foo.bar' gets loaded from # 'foo/bar.py'. modules = [] mp_path = modpattern.replace('.', '/') # Resolve wildcards if needed. if _stapre_name_has_wildcard(modpattern): # Now that we've got 'foo/bar', try to find it in the path. for component in path: if len(component): path_prefix = component + '/' else: path_prefix = '' # FIXME: We're going to be searching directories in the # path multiple times. To speed things up, we could cache # full directory results, then do matching against the # cached results. pathname = path_prefix + mp_path + '.py' if _verbose: _eprint("globbing '%s'" % pathname) glob_results = glob(pathname) if len(glob_results) > 0: if _verbose: _eprint("glob(%s) found: %s" % (pathname, glob_results)) for g in glob_results: # First get the part of the path past the prefix. full_modname = _remove_ext(g[len(path_prefix):]) # Convert "a/b/c" to "a.b.c". full_modname = full_modname.replace('/', '.') modules.append((full_modname, _remove_ext(os.path.basename(g)), [os.path.dirname(g)])) if _verbose: _eprint("module list 1: %s" % modules) # We also need to check for package directories containing # an '__init__.py' file. pathname = path_prefix + mp_path + '/__init__.py' glob_results = glob(pathname) if len(glob_results) > 0: if _verbose: _eprint("glob(%s) found: %s" % (pathname, glob_results)) for g in glob_results: # First remove the '/__init__.py' full_modname = os.path.dirname(g) # Now get the part of the path past the prefix. full_modname = full_modname[len(path_prefix):] # Convert "a/b/c" to "a.b.c". full_modname = full_modname.replace('/', '.') modules.append((full_modname, _remove_ext(os.path.basename(g)), [os.path.dirname(g)])) if _verbose: _eprint("module list 2: %s" % modules) else: # Handle paths without wildcards. # Now that we've got 'foo/bar', try to find it in the path. for component in path: if len(component): path_prefix = component + '/' else: path_prefix = '' if _verbose: _eprint("looking for '%s'" % (path_prefix + mp_path + '.py')) # FIXME: We're going to be searching directories in the # path multiple times. To speed things up, we could cache # full directory results, then do matching against the # cached results. pathname = path_prefix + mp_path + '.py' if os.path.isfile(pathname): if _verbose: _eprint("found: %s" % pathname) # First get the part of the path past the prefix. full_modname = mp_path # Convert "a/b/c" to "a.b.c". full_modname = full_modname.replace('/', '.') modules.append((full_modname, os.path.basename(mp_path), [os.path.dirname(pathname)])) if _verbose: _eprint("module list 1: %s" % modules) # We also need to check for package directories containing # an '__init__.py' file. pathname = path_prefix + mp_path + '/__init__.py' if os.path.isfile(pathname): if _verbose: _eprint("found: %s" % pathname) full_modname = mp_path # Convert "a/b/c" to "a.b.c". full_modname = full_modname.replace('/', '.') modules.append((full_modname, '__init__', [os.path.dirname(pathname)])) if _verbose: _eprint("module list 2: %s" % modules) if len(modules) == 0: return results if _verbose: _eprint("module list: %s" % modules) for (fm, m, p) in modules: if _verbose: _eprint("trying to load '%s'..." % fm) (fh, filename, descr) = imp.find_module(m, p) if descr[2] == imp.PY_SOURCE: if _verbose: _eprint("found module '%s'" % fm) results.append((fm, fh, filename, descr)) elif descr[2] == imp.PKG_DIRECTORY: # We've found a package directory, which we shouldn't have # since the loop above should only return full paths. raise ImportError('Unhandled package directory ' + fm) elif descr[2] == imp.C_BUILTIN: # Just ignore continue elif descr[2] == imp.C_EXTENSION: # Just ignore continue else: raise ImportError('Unknown descr: %d for module' % descr[2], fm) return results def _parse_function_pattern(function_pattern): """Parse the FUNCTION_PATTERN into its parts. See the resolve_pattern docstring for a description of FUNCTION_PATTERN. Returns a tuple of: (FUNCTION_PATTERN, PATH, LINENO_TYPE, RANGE) """ filename = None lineno_type = None lineno = None # First, look for a '@', indicating we've got a filename in # the function pattern. function_pattern = function_pattern.strip() ampersand = function_pattern.find('@') if ampersand > 0: filename = function_pattern[ampersand+1:].strip() function_pattern = function_pattern[:ampersand].strip() # Does the filename have a ':' or '+' in it, indicating a line # number? colon = filename.find(':') plus = filename.find('+') if colon > 0 and plus > 0: raise SyntaxError("Error: both ':' and '+' specified in '%s'." % filename) elif colon > 0 or plus > 0: if colon > 0: lineno_type = ':' pos = colon elif plus > 0 and colon < 0: lineno_type = '+' pos = plus lineno = filename[pos+1:].strip() filename = filename[:pos].strip() return (function_pattern, filename, lineno_type, lineno) def resolve_patterns(module_pattern, function_pattern): """Resolve the MODULE_PATTERN and FUNCTION_PATTERN into actual python module name, function name, source file and lines. MODULE_PATTERN is the name of the python module. This part may use the "*" and "?" wildcarding operators to match multiple names. FUNCTION_PATTERN is made up of 3 parts: FUNCTION[@PATH[[:+]RANGE]] where: - The first part is the name of a python function. This part may use the "*" and "?" wildcarding operators to match multiple names. - The second part is optinal and begins with the "@" character. It is followed by the path to the python source file containing the function, and may include a wildcard pattern. - Finally, the third part is optional if the path to the python source was given, and identifies the line number in the source file preceded by a ":" or a "+". The line number is assumed to be an absolute line number if preceded by a ":", or relative to the declaration line of the function if preceded by a "+". All the lines in the function can be matched with ":*". A range of lines x through y can be matched with ":x-y". Ranges and specific lines can be mixed using commas, e.g. ":x,y-z". """ global _verbose if _verbose: _eprint("Resolving patterns '%s' '%s'" % (module_pattern, function_pattern)) # Parse the function pattern into its parts. (function_pattern, filename, lineno_type, lineno) \ = _parse_function_pattern(function_pattern) # If we've got a filename (which could have wildcards), try to # handle it. modpattern_list = [] if filename: filename_list = [] # If we've got an absolute path, we don't need to search # for the file. if os.path.isabs(filename): if _stapre_name_has_wildcard(filename): filename_list = glob(filename) elif os.path.isfile(filename): filename_list.append(filename) else: for component in _get_default_search_path(): if len(component): path_prefix = component + '/' else: path_prefix = '' if _stapre_name_has_wildcard(filename): if _verbose: _eprint("globbing '%s'" % (path_prefix + filename)) filename_list.extend(glob(path_prefix + filename)) elif os.path.isfile(path_prefix + filename): filename_list.append(path_prefix + filename) # If we had a explicit filename, but couldn't find it, we've # got an error. if len(filename_list) == 0: raise IOError("filename '%s' can't be found." % filename) # OK, a filename was specified and we found it. Now we need to # mangle the module part of the pattern to include the # path of the file we found. # # FIXME: Note we aren't validating the module name against the # filename. So, 'module("a*").function("b*@foo.py")' is going # to match, even though module 'foo' doesn't match 'a*'. for f in filename_list: abspath = os.path.abspath(f) # We want the same number of 'levels' in the answer as in # the input. If the module pattern contains 'f*.b*', we # want the module name to be 'foo.bar'. levels = module_pattern.count('.') + 1 parts = _remove_ext(abspath).split('/') if os.path.basename(abspath) != '__init__.py': mod_name = '.'.join(parts[(len(parts) - levels):]) mod_path = '/'.join(parts[:(len(parts) - levels)]) else: mod_name = '.'.join(parts[(len(parts) - levels - 1):-1]) mod_path = '/'.join(parts[:(len(parts) - levels) - 1]) modpattern_list.append((mod_name, [mod_path])) else: modpattern_list.append((module_pattern, None)) if _verbose: _eprint("modpattern_list: %s" % modpattern_list) ret_list = [] ret_list_format = '%s %s@%s:%d' ret_list_flag_format = '%s %s@%s:%d %s' for (mp, p) in modpattern_list: # Try to load the source for the module(s). if _verbose: _eprint("using _find_wildcarded_modules(%s, %s)..." % (mp, p)) results = _find_wildcarded_modules(mp, p) if _verbose: _eprint('_find_wildcarded_modules() returned %s' % results) for (module, f, filename, descr) in results: if _verbose: _eprint("Loading source for module '%s'" % module) try: source = f.read() finally: f.close() if filename is None or source is None: raise IOError("Couldn't find module '%s'" % module) # Parse the source, turning it into a AST (Abstract Syntax # Tree). This doesn't actually load the file (which would run # it). tree = ast.parse(source, filename, "exec") # Walk the AST, looking for function definitions, line number, etc. walker = _AstWalker(module, filename) modinfo = walker.visit(tree) esc_pattern = (_stapre_escape(mp) + '.' + _stapre_escape(function_pattern) + '$') re_obj = re.compile(esc_pattern) for (func, lines) in modinfo.functions: if _verbose: _eprint("matching %s against '%s'" % (func, esc_pattern)) if re_obj.match(func): if _verbose: _eprint("%s matches %s" % (func, esc_pattern)) bare_func = func[len(module) + 1:] # No line numbers were specified. So, report the # function definition line (the # first line # number). Add the 'call' specifier so that # systemtap knows what's going on. if lineno_type is None and lineno is None: ret_list.append(ret_list_flag_format % (module, bare_func, modinfo.path, lines[0], 'call')) continue # We do line matching here. First, handle wildcard. if lineno == '*': for l in lines[1:]: ret_list.append(ret_list_format % (module, bare_func, modinfo.path, l)) continue # Handle absolute or relative line numbers # here. Try to parse N, N-M, or N,M,O,P, or a # combination thereof... for lrange in lineno.split(','): # Handle 'N-M' dash = lrange.find('-') if dash: low = lrange[:dash] high = lrange[dash + 1:] # Normalize relative line numbers. if lineno_type == '+': low += lines[0] high += lines[0] # Look for lines that are between low and # high. for l in lines[1:]: if l >= low and l >= high: ret_list.append(ret_list_format % (module, bare_func, modinfo.path, l)) # Handle 'N' elif lrange in lines[1:]: ret_list.append(ret_list_format % (module, bare_func, modinfo.path, l)) if _verbose: _eprint('returning %s' % ret_list) return ret_list class _ModuleInfo(object): def __init__(self, name=None, path=None): self.name = name self.path = path self.functions = [] self.lines = [] def dump(self): _eprint('Name: %s' % self.name) _eprint('Path: %s' % self.path) for (func, lines) in self.functions: _eprint('%s: %s' % (func, lines)) _eprint('%s: %s' % (self.name, self.lines)) def add_function(self, funcname, linelist): self.functions.append((funcname, linelist)) def add_linelist(self, linelist): self.lines = linelist class _AstWalker(ast.NodeVisitor): def __init__(self, mod_name, mod_path, verbose=False): self.lastline = -1 self.names = [] self.names.append(mod_name) self.indent = 0 self.indent_with = ' ' self.linelist = [] self.verbose = verbose self.modinfo = _ModuleInfo(mod_name, mod_path) def visit_Module(self, node): if self.verbose: _eprint("found module") self.generic_visit(node) self.modinfo.add_linelist(self.linelist) return self.modinfo def body(self, statements): for stmt in statements: self.visit(stmt) def visit_ClassDef(self, node): if self.verbose: _eprint("%sfound class %s (%d)" % (self.indent_with * self.indent, node.name, node.lineno)) self.names.append(node.name) self.indent += 1 self.body(node.body) self.indent -= 1 self.names.pop() def visit_FunctionDef(self, node): self.names.append(node.name) funcname = '.'.join(self.names) if self.verbose: _eprint("%sfound FunctionDef %s (%d)" % (self.indent_with * self.indent, funcname, node.lineno)) self.indent += 1 saved_linelist = self.linelist self.linelist = [] self.linelist.append(node.lineno) self.body(node.body) self.indent -= 1 self.modinfo.add_function(funcname, self.linelist) self.linelist = saved_linelist self.names.pop() def generic_visit(self, node): try: if self.lastline < node.lineno: self.lastline = node.lineno if self.verbose: _eprint("%sstmt: %d" % (self.indent_with * self.indent, node.lineno)) self.linelist.append(node.lineno) except AttributeError: pass ast.NodeVisitor.generic_visit(self, node) def _usage(): _eprint("Usage: %s [-v] MODULE_PATTERN FUNCTION_PATTERN" % sys.argv[0]) sys.exit(1) if __name__ == '__main__': import getopt if len(sys.argv) < 3: _usage() try: (opts, pargs) = getopt.getopt(sys.argv[1:], 'v') except getopt.GetoptError as e: _eprint("Error: %s" % e) _usage() for (opt, value) in opts: if opt == '-v': _verbose += 1 if len(pargs) != 2: _usage() try: results = resolve_patterns(pargs[0], pargs[1]) if results: for s in results: print(s) except IOError as e: _eprint("IOError: %s" % e) sys.exit(1) except SyntaxError as e: _eprint("SyntaxError: %s" % e) sys.exit(1)
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