376 lines
12 KiB
Python
376 lines
12 KiB
Python
import ast
|
|
import codegen
|
|
import logging
|
|
import os.path
|
|
import bb.utils, bb.data
|
|
from itertools import chain
|
|
from pysh import pyshyacc, pyshlex, sherrors
|
|
|
|
|
|
logger = logging.getLogger('BitBake.CodeParser')
|
|
PARSERCACHE_VERSION = 2
|
|
|
|
try:
|
|
import cPickle as pickle
|
|
except ImportError:
|
|
import pickle
|
|
logger.info('Importing cPickle failed. Falling back to a very slow implementation.')
|
|
|
|
|
|
def check_indent(codestr):
|
|
"""If the code is indented, add a top level piece of code to 'remove' the indentation"""
|
|
|
|
i = 0
|
|
while codestr[i] in ["\n", "\t", " "]:
|
|
i = i + 1
|
|
|
|
if i == 0:
|
|
return codestr
|
|
|
|
if codestr[i-1] == "\t" or codestr[i-1] == " ":
|
|
return "if 1:\n" + codestr
|
|
|
|
return codestr
|
|
|
|
pythonparsecache = {}
|
|
shellparsecache = {}
|
|
|
|
def parser_cachefile(d):
|
|
cachedir = (bb.data.getVar("PERSISTENT_DIR", d, True) or
|
|
bb.data.getVar("CACHE", d, True))
|
|
if cachedir in [None, '']:
|
|
return None
|
|
bb.utils.mkdirhier(cachedir)
|
|
cachefile = os.path.join(cachedir, "bb_codeparser.dat")
|
|
logger.debug(1, "Using cache in '%s' for codeparser cache", cachefile)
|
|
return cachefile
|
|
|
|
def parser_cache_init(d):
|
|
global pythonparsecache
|
|
global shellparsecache
|
|
|
|
cachefile = parser_cachefile(d)
|
|
if not cachefile:
|
|
return
|
|
|
|
try:
|
|
p = pickle.Unpickler(file(cachefile, "rb"))
|
|
data, version = p.load()
|
|
except:
|
|
return
|
|
|
|
if version != PARSERCACHE_VERSION:
|
|
return
|
|
|
|
pythonparsecache = data[0]
|
|
shellparsecache = data[1]
|
|
|
|
def parser_cache_save(d):
|
|
cachefile = parser_cachefile(d)
|
|
if not cachefile:
|
|
return
|
|
|
|
glf = bb.utils.lockfile(cachefile + ".lock", shared=True)
|
|
|
|
i = os.getpid()
|
|
lf = None
|
|
while not lf:
|
|
shellcache = {}
|
|
pythoncache = {}
|
|
|
|
lf = bb.utils.lockfile(cachefile + ".lock." + str(i), retry=False)
|
|
if not lf or os.path.exists(cachefile + "-" + str(i)):
|
|
if lf:
|
|
bb.utils.unlockfile(lf)
|
|
lf = None
|
|
i = i + 1
|
|
continue
|
|
|
|
try:
|
|
p = pickle.Unpickler(file(cachefile, "rb"))
|
|
data, version = p.load()
|
|
except (IOError, EOFError, ValueError):
|
|
data, version = None, None
|
|
|
|
if version != PARSERCACHE_VERSION:
|
|
shellcache = shellparsecache
|
|
pythoncache = pythonparsecache
|
|
else:
|
|
for h in pythonparsecache:
|
|
if h not in data[0]:
|
|
pythoncache[h] = pythonparsecache[h]
|
|
for h in shellparsecache:
|
|
if h not in data[1]:
|
|
shellcache[h] = shellparsecache[h]
|
|
|
|
p = pickle.Pickler(file(cachefile + "-" + str(i), "wb"), -1)
|
|
p.dump([[pythoncache, shellcache], PARSERCACHE_VERSION])
|
|
|
|
bb.utils.unlockfile(lf)
|
|
bb.utils.unlockfile(glf)
|
|
|
|
def parser_cache_savemerge(d):
|
|
cachefile = parser_cachefile(d)
|
|
if not cachefile:
|
|
return
|
|
|
|
glf = bb.utils.lockfile(cachefile + ".lock")
|
|
|
|
try:
|
|
p = pickle.Unpickler(file(cachefile, "rb"))
|
|
data, version = p.load()
|
|
except (IOError, EOFError):
|
|
data, version = None, None
|
|
|
|
if version != PARSERCACHE_VERSION:
|
|
data = [{}, {}]
|
|
|
|
for f in [y for y in os.listdir(os.path.dirname(cachefile)) if y.startswith(os.path.basename(cachefile) + '-')]:
|
|
f = os.path.join(os.path.dirname(cachefile), f)
|
|
try:
|
|
p = pickle.Unpickler(file(f, "rb"))
|
|
extradata, version = p.load()
|
|
except (IOError, EOFError):
|
|
extradata, version = [{}, {}], None
|
|
|
|
if version != PARSERCACHE_VERSION:
|
|
continue
|
|
|
|
for h in extradata[0]:
|
|
if h not in data[0]:
|
|
data[0][h] = extradata[0][h]
|
|
for h in extradata[1]:
|
|
if h not in data[1]:
|
|
data[1][h] = extradata[1][h]
|
|
os.unlink(f)
|
|
|
|
p = pickle.Pickler(file(cachefile, "wb"), -1)
|
|
p.dump([data, PARSERCACHE_VERSION])
|
|
|
|
bb.utils.unlockfile(glf)
|
|
|
|
|
|
Logger = logging.getLoggerClass()
|
|
class BufferedLogger(Logger):
|
|
def __init__(self, name, level=0, target=None):
|
|
Logger.__init__(self, name)
|
|
self.setLevel(level)
|
|
self.buffer = []
|
|
self.target = target
|
|
|
|
def handle(self, record):
|
|
self.buffer.append(record)
|
|
|
|
def flush(self):
|
|
for record in self.buffer:
|
|
self.target.handle(record)
|
|
self.buffer = []
|
|
|
|
class PythonParser():
|
|
getvars = ("d.getVar", "bb.data.getVar", "data.getVar")
|
|
execfuncs = ("bb.build.exec_func", "bb.build.exec_task")
|
|
|
|
def warn(self, func, arg):
|
|
"""Warn about calls of bitbake APIs which pass a non-literal
|
|
argument for the variable name, as we're not able to track such
|
|
a reference.
|
|
"""
|
|
|
|
try:
|
|
funcstr = codegen.to_source(func)
|
|
argstr = codegen.to_source(arg)
|
|
except TypeError:
|
|
self.log.debug(2, 'Failed to convert function and argument to source form')
|
|
else:
|
|
self.log.debug(1, self.unhandled_message % (funcstr, argstr))
|
|
|
|
def visit_Call(self, node):
|
|
name = self.called_node_name(node.func)
|
|
if name in self.getvars:
|
|
if isinstance(node.args[0], ast.Str):
|
|
self.var_references.add(node.args[0].s)
|
|
else:
|
|
self.warn(node.func, node.args[0])
|
|
elif name in self.execfuncs:
|
|
if isinstance(node.args[0], ast.Str):
|
|
self.var_execs.add(node.args[0].s)
|
|
else:
|
|
self.warn(node.func, node.args[0])
|
|
elif name and isinstance(node.func, (ast.Name, ast.Attribute)):
|
|
self.execs.add(name)
|
|
|
|
def called_node_name(self, node):
|
|
"""Given a called node, return its original string form"""
|
|
components = []
|
|
while node:
|
|
if isinstance(node, ast.Attribute):
|
|
components.append(node.attr)
|
|
node = node.value
|
|
elif isinstance(node, ast.Name):
|
|
components.append(node.id)
|
|
return '.'.join(reversed(components))
|
|
else:
|
|
break
|
|
|
|
def __init__(self, name, log):
|
|
self.var_references = set()
|
|
self.var_execs = set()
|
|
self.execs = set()
|
|
self.references = set()
|
|
self.log = BufferedLogger('BitBake.Data.%s' % name, logging.DEBUG, log)
|
|
|
|
self.unhandled_message = "in call of %s, argument '%s' is not a string literal"
|
|
self.unhandled_message = "while parsing %s, %s" % (name, self.unhandled_message)
|
|
|
|
def parse_python(self, node):
|
|
h = hash(str(node))
|
|
|
|
if h in pythonparsecache:
|
|
self.references = pythonparsecache[h]["refs"]
|
|
self.execs = pythonparsecache[h]["execs"]
|
|
return
|
|
|
|
code = compile(check_indent(str(node)), "<string>", "exec",
|
|
ast.PyCF_ONLY_AST)
|
|
|
|
for n in ast.walk(code):
|
|
if n.__class__.__name__ == "Call":
|
|
self.visit_Call(n)
|
|
|
|
self.references.update(self.var_references)
|
|
self.references.update(self.var_execs)
|
|
|
|
pythonparsecache[h] = {}
|
|
pythonparsecache[h]["refs"] = self.references
|
|
pythonparsecache[h]["execs"] = self.execs
|
|
|
|
class ShellParser():
|
|
def __init__(self, name, log):
|
|
self.funcdefs = set()
|
|
self.allexecs = set()
|
|
self.execs = set()
|
|
self.log = BufferedLogger('BitBake.Data.%s' % name, logging.DEBUG, log)
|
|
self.unhandled_template = "unable to handle non-literal command '%s'"
|
|
self.unhandled_template = "while parsing %s, %s" % (name, self.unhandled_template)
|
|
|
|
def parse_shell(self, value):
|
|
"""Parse the supplied shell code in a string, returning the external
|
|
commands it executes.
|
|
"""
|
|
|
|
h = hash(str(value))
|
|
|
|
if h in shellparsecache:
|
|
self.execs = shellparsecache[h]["execs"]
|
|
return self.execs
|
|
|
|
try:
|
|
tokens, _ = pyshyacc.parse(value, eof=True, debug=False)
|
|
except pyshlex.NeedMore:
|
|
raise sherrors.ShellSyntaxError("Unexpected EOF")
|
|
|
|
for token in tokens:
|
|
self.process_tokens(token)
|
|
self.execs = set(cmd for cmd in self.allexecs if cmd not in self.funcdefs)
|
|
|
|
shellparsecache[h] = {}
|
|
shellparsecache[h]["execs"] = self.execs
|
|
|
|
return self.execs
|
|
|
|
def process_tokens(self, tokens):
|
|
"""Process a supplied portion of the syntax tree as returned by
|
|
pyshyacc.parse.
|
|
"""
|
|
|
|
def function_definition(value):
|
|
self.funcdefs.add(value.name)
|
|
return [value.body], None
|
|
|
|
def case_clause(value):
|
|
# Element 0 of each item in the case is the list of patterns, and
|
|
# Element 1 of each item in the case is the list of commands to be
|
|
# executed when that pattern matches.
|
|
words = chain(*[item[0] for item in value.items])
|
|
cmds = chain(*[item[1] for item in value.items])
|
|
return cmds, words
|
|
|
|
def if_clause(value):
|
|
main = chain(value.cond, value.if_cmds)
|
|
rest = value.else_cmds
|
|
if isinstance(rest, tuple) and rest[0] == "elif":
|
|
return chain(main, if_clause(rest[1]))
|
|
else:
|
|
return chain(main, rest)
|
|
|
|
def simple_command(value):
|
|
return None, chain(value.words, (assign[1] for assign in value.assigns))
|
|
|
|
token_handlers = {
|
|
"and_or": lambda x: ((x.left, x.right), None),
|
|
"async": lambda x: ([x], None),
|
|
"brace_group": lambda x: (x.cmds, None),
|
|
"for_clause": lambda x: (x.cmds, x.items),
|
|
"function_definition": function_definition,
|
|
"if_clause": lambda x: (if_clause(x), None),
|
|
"pipeline": lambda x: (x.commands, None),
|
|
"redirect_list": lambda x: ([x.cmd], None),
|
|
"subshell": lambda x: (x.cmds, None),
|
|
"while_clause": lambda x: (chain(x.condition, x.cmds), None),
|
|
"until_clause": lambda x: (chain(x.condition, x.cmds), None),
|
|
"simple_command": simple_command,
|
|
"case_clause": case_clause,
|
|
}
|
|
|
|
for token in tokens:
|
|
name, value = token
|
|
try:
|
|
more_tokens, words = token_handlers[name](value)
|
|
except KeyError:
|
|
raise NotImplementedError("Unsupported token type " + name)
|
|
|
|
if more_tokens:
|
|
self.process_tokens(more_tokens)
|
|
|
|
if words:
|
|
self.process_words(words)
|
|
|
|
def process_words(self, words):
|
|
"""Process a set of 'words' in pyshyacc parlance, which includes
|
|
extraction of executed commands from $() blocks, as well as grabbing
|
|
the command name argument.
|
|
"""
|
|
|
|
words = list(words)
|
|
for word in list(words):
|
|
wtree = pyshlex.make_wordtree(word[1])
|
|
for part in wtree:
|
|
if not isinstance(part, list):
|
|
continue
|
|
|
|
if part[0] in ('`', '$('):
|
|
command = pyshlex.wordtree_as_string(part[1:-1])
|
|
self.parse_shell(command)
|
|
|
|
if word[0] in ("cmd_name", "cmd_word"):
|
|
if word in words:
|
|
words.remove(word)
|
|
|
|
usetoken = False
|
|
for word in words:
|
|
if word[0] in ("cmd_name", "cmd_word") or \
|
|
(usetoken and word[0] == "TOKEN"):
|
|
if "=" in word[1]:
|
|
usetoken = True
|
|
continue
|
|
|
|
cmd = word[1]
|
|
if cmd.startswith("$"):
|
|
self.log.debug(1, self.unhandled_template % cmd)
|
|
elif cmd == "eval":
|
|
command = " ".join(word for _, word in words[1:])
|
|
self.parse_shell(command)
|
|
else:
|
|
self.allexecs.add(cmd)
|
|
break
|