407 lines
14 KiB
Python
407 lines
14 KiB
Python
import ast
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import codegen
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import logging
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import os.path
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import bb.utils, bb.data
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from itertools import chain
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from pysh import pyshyacc, pyshlex, sherrors
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from bb.cache import MultiProcessCache
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logger = logging.getLogger('BitBake.CodeParser')
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try:
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import cPickle as pickle
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except ImportError:
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import pickle
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logger.info('Importing cPickle failed. Falling back to a very slow implementation.')
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def check_indent(codestr):
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"""If the code is indented, add a top level piece of code to 'remove' the indentation"""
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i = 0
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while codestr[i] in ["\n", "\t", " "]:
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i = i + 1
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if i == 0:
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return codestr
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if codestr[i-1] == "\t" or codestr[i-1] == " ":
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return "if 1:\n" + codestr
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return codestr
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# Basically pickle, in python 2.7.3 at least, does badly with data duplication
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# upon pickling and unpickling. Combine this with duplicate objects and things
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# are a mess.
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#
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# When the sets are originally created, python calls intern() on the set keys
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# which significantly improves memory usage. Sadly the pickle/unpickle process
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# doesn't call intern() on the keys and results in the same strings being duplicated
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# in memory. This also means pickle will save the same string multiple times in
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# the cache file.
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#
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# By having shell and python cacheline objects with setstate/getstate, we force
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# the object creation through our own routine where we can call intern (via internSet).
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#
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# We also use hashable frozensets and ensure we use references to these so that
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# duplicates can be removed, both in memory and in the resulting pickled data.
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#
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# By playing these games, the size of the cache file shrinks dramatically
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# meaning faster load times and the reloaded cache files also consume much less
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# memory. Smaller cache files, faster load times and lower memory usage is good.
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#
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# A custom getstate/setstate using tuples is actually worth 15% cachesize by
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# avoiding duplication of the attribute names!
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class SetCache(object):
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def __init__(self):
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self.setcache = {}
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def internSet(self, items):
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new = []
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for i in items:
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new.append(intern(i))
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s = frozenset(new)
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if hash(s) in self.setcache:
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return self.setcache[hash(s)]
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self.setcache[hash(s)] = s
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return s
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codecache = SetCache()
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class pythonCacheLine(object):
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def __init__(self, refs, execs, contains):
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self.refs = codecache.internSet(refs)
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self.execs = codecache.internSet(execs)
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self.contains = {}
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for c in contains:
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self.contains[c] = codecache.internSet(contains[c])
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def __getstate__(self):
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return (self.refs, self.execs, self.contains)
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def __setstate__(self, state):
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(refs, execs, contains) = state
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self.__init__(refs, execs, contains)
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def __hash__(self):
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l = (hash(self.refs), hash(self.execs))
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for c in sorted(self.contains.keys()):
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l = l + (c, hash(self.contains[c]))
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return hash(l)
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class shellCacheLine(object):
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def __init__(self, execs):
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self.execs = codecache.internSet(execs)
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def __getstate__(self):
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return (self.execs)
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def __setstate__(self, state):
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(execs) = state
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self.__init__(execs)
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def __hash__(self):
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return hash(self.execs)
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class CodeParserCache(MultiProcessCache):
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cache_file_name = "bb_codeparser.dat"
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CACHE_VERSION = 7
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def __init__(self):
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MultiProcessCache.__init__(self)
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self.pythoncache = self.cachedata[0]
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self.shellcache = self.cachedata[1]
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self.pythoncacheextras = self.cachedata_extras[0]
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self.shellcacheextras = self.cachedata_extras[1]
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# To avoid duplication in the codeparser cache, keep
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# a lookup of hashes of objects we already have
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self.pythoncachelines = {}
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self.shellcachelines = {}
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def newPythonCacheLine(self, refs, execs, contains):
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cacheline = pythonCacheLine(refs, execs, contains)
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h = hash(cacheline)
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if h in self.pythoncachelines:
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return self.pythoncachelines[h]
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self.pythoncachelines[h] = cacheline
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return cacheline
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def newShellCacheLine(self, execs):
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cacheline = shellCacheLine(execs)
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h = hash(cacheline)
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if h in self.shellcachelines:
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return self.shellcachelines[h]
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self.shellcachelines[h] = cacheline
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return cacheline
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def init_cache(self, d):
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MultiProcessCache.init_cache(self, d)
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# cachedata gets re-assigned in the parent
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self.pythoncache = self.cachedata[0]
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self.shellcache = self.cachedata[1]
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def create_cachedata(self):
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data = [{}, {}]
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return data
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codeparsercache = CodeParserCache()
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def parser_cache_init(d):
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codeparsercache.init_cache(d)
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def parser_cache_save(d):
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codeparsercache.save_extras(d)
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def parser_cache_savemerge(d):
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codeparsercache.save_merge(d)
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Logger = logging.getLoggerClass()
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class BufferedLogger(Logger):
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def __init__(self, name, level=0, target=None):
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Logger.__init__(self, name)
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self.setLevel(level)
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self.buffer = []
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self.target = target
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def handle(self, record):
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self.buffer.append(record)
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def flush(self):
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for record in self.buffer:
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self.target.handle(record)
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self.buffer = []
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class PythonParser():
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getvars = (".getVar", ".appendVar", ".prependVar")
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containsfuncs = ("bb.utils.contains", "base_contains", "bb.utils.contains_any")
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execfuncs = ("bb.build.exec_func", "bb.build.exec_task")
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def warn(self, func, arg):
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"""Warn about calls of bitbake APIs which pass a non-literal
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argument for the variable name, as we're not able to track such
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a reference.
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"""
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try:
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funcstr = codegen.to_source(func)
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argstr = codegen.to_source(arg)
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except TypeError:
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self.log.debug(2, 'Failed to convert function and argument to source form')
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else:
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self.log.debug(1, self.unhandled_message % (funcstr, argstr))
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def visit_Call(self, node):
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name = self.called_node_name(node.func)
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if name and name.endswith(self.getvars) or name in self.containsfuncs:
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if isinstance(node.args[0], ast.Str):
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varname = node.args[0].s
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if name in self.containsfuncs and isinstance(node.args[1], ast.Str):
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if varname not in self.contains:
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self.contains[varname] = set()
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self.contains[varname].add(node.args[1].s)
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else:
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self.references.add(node.args[0].s)
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else:
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self.warn(node.func, node.args[0])
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elif name in self.execfuncs:
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if isinstance(node.args[0], ast.Str):
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self.var_execs.add(node.args[0].s)
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else:
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self.warn(node.func, node.args[0])
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elif name and isinstance(node.func, (ast.Name, ast.Attribute)):
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self.execs.add(name)
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def called_node_name(self, node):
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"""Given a called node, return its original string form"""
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components = []
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while node:
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if isinstance(node, ast.Attribute):
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components.append(node.attr)
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node = node.value
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elif isinstance(node, ast.Name):
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components.append(node.id)
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return '.'.join(reversed(components))
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else:
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break
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def __init__(self, name, log):
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self.var_execs = set()
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self.contains = {}
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self.execs = set()
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self.references = set()
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self.log = BufferedLogger('BitBake.Data.PythonParser', logging.DEBUG, log)
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self.unhandled_message = "in call of %s, argument '%s' is not a string literal"
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self.unhandled_message = "while parsing %s, %s" % (name, self.unhandled_message)
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def parse_python(self, node):
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h = hash(str(node))
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if h in codeparsercache.pythoncache:
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self.references = set(codeparsercache.pythoncache[h].refs)
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self.execs = set(codeparsercache.pythoncache[h].execs)
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self.contains = {}
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for i in codeparsercache.pythoncache[h].contains:
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self.contains[i] = set(codeparsercache.pythoncache[h].contains[i])
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return
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if h in codeparsercache.pythoncacheextras:
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self.references = set(codeparsercache.pythoncacheextras[h].refs)
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self.execs = set(codeparsercache.pythoncacheextras[h].execs)
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self.contains = {}
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for i in codeparsercache.pythoncacheextras[h].contains:
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self.contains[i] = set(codeparsercache.pythoncacheextras[h].contains[i])
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return
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code = compile(check_indent(str(node)), "<string>", "exec",
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ast.PyCF_ONLY_AST)
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for n in ast.walk(code):
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if n.__class__.__name__ == "Call":
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self.visit_Call(n)
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self.execs.update(self.var_execs)
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codeparsercache.pythoncacheextras[h] = codeparsercache.newPythonCacheLine(self.references, self.execs, self.contains)
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class ShellParser():
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def __init__(self, name, log):
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self.funcdefs = set()
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self.allexecs = set()
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self.execs = set()
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self.log = BufferedLogger('BitBake.Data.%s' % name, logging.DEBUG, log)
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self.unhandled_template = "unable to handle non-literal command '%s'"
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self.unhandled_template = "while parsing %s, %s" % (name, self.unhandled_template)
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def parse_shell(self, value):
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"""Parse the supplied shell code in a string, returning the external
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commands it executes.
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"""
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h = hash(str(value))
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if h in codeparsercache.shellcache:
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self.execs = set(codeparsercache.shellcache[h].execs)
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return self.execs
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if h in codeparsercache.shellcacheextras:
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self.execs = set(codeparsercache.shellcacheextras[h].execs)
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return self.execs
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self._parse_shell(value)
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self.execs = set(cmd for cmd in self.allexecs if cmd not in self.funcdefs)
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codeparsercache.shellcacheextras[h] = codeparsercache.newShellCacheLine(self.execs)
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return self.execs
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def _parse_shell(self, value):
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try:
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tokens, _ = pyshyacc.parse(value, eof=True, debug=False)
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except pyshlex.NeedMore:
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raise sherrors.ShellSyntaxError("Unexpected EOF")
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for token in tokens:
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self.process_tokens(token)
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def process_tokens(self, tokens):
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"""Process a supplied portion of the syntax tree as returned by
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pyshyacc.parse.
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"""
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def function_definition(value):
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self.funcdefs.add(value.name)
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return [value.body], None
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def case_clause(value):
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# Element 0 of each item in the case is the list of patterns, and
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# Element 1 of each item in the case is the list of commands to be
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# executed when that pattern matches.
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words = chain(*[item[0] for item in value.items])
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cmds = chain(*[item[1] for item in value.items])
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return cmds, words
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def if_clause(value):
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main = chain(value.cond, value.if_cmds)
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rest = value.else_cmds
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if isinstance(rest, tuple) and rest[0] == "elif":
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return chain(main, if_clause(rest[1]))
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else:
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return chain(main, rest)
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def simple_command(value):
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return None, chain(value.words, (assign[1] for assign in value.assigns))
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token_handlers = {
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"and_or": lambda x: ((x.left, x.right), None),
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"async": lambda x: ([x], None),
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"brace_group": lambda x: (x.cmds, None),
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"for_clause": lambda x: (x.cmds, x.items),
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"function_definition": function_definition,
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"if_clause": lambda x: (if_clause(x), None),
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"pipeline": lambda x: (x.commands, None),
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"redirect_list": lambda x: ([x.cmd], None),
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"subshell": lambda x: (x.cmds, None),
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"while_clause": lambda x: (chain(x.condition, x.cmds), None),
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"until_clause": lambda x: (chain(x.condition, x.cmds), None),
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"simple_command": simple_command,
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"case_clause": case_clause,
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}
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for token in tokens:
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name, value = token
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try:
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more_tokens, words = token_handlers[name](value)
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except KeyError:
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raise NotImplementedError("Unsupported token type " + name)
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if more_tokens:
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self.process_tokens(more_tokens)
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if words:
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self.process_words(words)
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def process_words(self, words):
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"""Process a set of 'words' in pyshyacc parlance, which includes
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extraction of executed commands from $() blocks, as well as grabbing
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the command name argument.
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"""
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words = list(words)
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for word in list(words):
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wtree = pyshlex.make_wordtree(word[1])
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for part in wtree:
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if not isinstance(part, list):
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continue
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if part[0] in ('`', '$('):
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command = pyshlex.wordtree_as_string(part[1:-1])
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self._parse_shell(command)
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if word[0] in ("cmd_name", "cmd_word"):
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if word in words:
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words.remove(word)
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usetoken = False
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for word in words:
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if word[0] in ("cmd_name", "cmd_word") or \
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(usetoken and word[0] == "TOKEN"):
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if "=" in word[1]:
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usetoken = True
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continue
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cmd = word[1]
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if cmd.startswith("$"):
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self.log.debug(1, self.unhandled_template % cmd)
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elif cmd == "eval":
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command = " ".join(word for _, word in words[1:])
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self._parse_shell(command)
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else:
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self.allexecs.add(cmd)
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break
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