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test_lfs.py
178 lines (139 loc) · 5.65 KB
/
test_lfs.py
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import errno
from lfs import LFS
from disk import assertion, debug, Stat
from yggdrasil.diskspec import *
from yggdrasil import test
class LFSSpec(object):
def __init__(self, mach, dirfn, parentfn, modefn, mtimefn):
self._mach = mach
self._dirfn = dirfn
self._modefn = modefn
self._mtimefn = mtimefn
self._parentfn = parentfn
def lookup(self, parent, name):
ino = self._dirfn(parent, name)
return If(0 < ino, ino, -errno.ENOENT)
def get_attr(self, ino):
return Stat(bsize=0,
mode=self._modefn(ino),
mtime=self._mtimefn(ino))
def mknod(self, parent, name, mode, mtime):
if 0 < self.lookup(parent, name):
return BitVecVal(-errno.EEXIST, 64)
on = self._mach.create_on([])
ino = FreshBitVec('ino', 64)
assertion(0 < ino)
assertion(Not(0 < self._parentfn(ino)))
self._dirfn = self._dirfn.update((parent, name), ino, guard=on)
self._modefn = self._modefn.update(ino, mode, guard=on)
self._mtimefn = self._mtimefn.update(ino, mtime, guard=on)
self._parentfn = self._parentfn.update(ino, parent, guard=on)
return ino
def crash(self, mach):
return self.__class__(mach, self._dirfn, self._parentfn, self._modefn, self._mtimefn)
class LFSRefinement(test.RefinementTest):
def create_spec(self, mach):
dirfn = FreshUFunction('dirfn', SizeSort, SizeSort, SizeSort)
parentfn = FreshUFunction('parentfn', SizeSort, SizeSort)
modefn = FreshUFunction('modefn', SizeSort, SizeSort)
mtimefn = FreshUFunction('mtimefn', SizeSort, SizeSort)
return LFSSpec(mach, dirfn, parentfn, modefn, mtimefn)
def create_impl(self, mach):
array = FreshDiskArray('disk')
disk = AsyncDisk(mach, array)
return LFS(disk)
def pre_post(self, spec, impl, **kwargs):
name = FreshBitVec('name.pre', 64)
parent = BitVecVal(1, 64)
sb = impl._disk.read(0)
imap = impl._disk.read(sb[2])
off = FreshBitVec('off', 9)
pre = ForAll([name], Implies(name != 0, And(
Implies(0 < spec._dirfn(parent, name),
parent == spec._parentfn(spec._dirfn(parent, name))),
Implies(0 < impl.lookup(parent, name),
And(impl.lookup(parent, name) < sb[1],
spec.get_attr(spec.lookup(parent, name)) == impl.get_attr(impl.lookup(parent, name)))),
spec.lookup(parent, name) == impl.lookup(parent, name))))
pre = And(pre,
ForAll([off], Implies(ZeroExt(64 - off.size(), off) < sb[1], And(0 < imap[off], imap[off] < sb[0]))))
pre = And(pre,
# allocated blocks are in range ]0..allocator[
0 < sb[2], sb[2] < sb[0],
0 < imap[1], imap[1] < sb[0],
# root dir inode has been allocated
1 < sb[1],
)
(spec, impl, (_, name0, _, _), (sino, iino)) = yield pre
self.show(pre)
if iino < 0:
iino = impl.lookup(parent, name0)
if self._solve(sino == iino):
assertion(sino == iino)
sb = impl._disk.read(0)
imap = impl._disk.read(sb[2])
post = ForAll([name], Implies(name != 0, And(
Implies(0 < spec._dirfn(parent, name),
parent == spec._parentfn(spec._dirfn(parent, name))),
Implies(0 < impl.lookup(parent, name),
And(impl.lookup(parent, name) < sb[1],
spec.get_attr(spec.lookup(parent, name)) == impl.get_attr(impl.lookup(parent, name)))),
spec.lookup(parent, name) == impl.lookup(parent, name))))
post = And(post,
ForAll([off], Implies(ZeroExt(64 - off.size(), off) < sb[1], And(0 < imap[off], imap[off] < sb[0]))))
post = And(post,
# allocated blocks are in range ]0..allocator[
0 < sb[2], sb[2] < sb[0],
0 < imap[1], imap[1] < sb[0],
# root dir inode has been allocated
1 < sb[1],
)
yield post
def match_mknod(self):
parent = BitVecVal(1, 64)
name = FreshBitVec('name', 64)
mode = FreshBitVec('mode', 64)
mtime = FreshBitVec('mtime', 64)
assertion(name != 0)
yield (parent, name, mode, mtime)
# test
# def test_foo(self):
# mach = Machine()
# impl = self.create_impl(mach)
#
# parent = BitVecVal(1, 64)
# name = BitVecVal(0xdeadbeef, 64)
# mode = BitVecVal(0x1337, 64)
#
# sb = impl._disk.read(0)
# imap = impl._disk.read(sb[2])
#
# name0 = FreshSize('name')
#
# pre = And(
# # inode alloc
# 0 < sb[1], sb[1] < 512,
#
# # allocated blocks are in range ]0..allocator[
# 0 < sb[2], sb[2] < sb[0],
# 0 < imap[1], imap[1] < sb[0],
# 0 < imap[1], sb[2] < imap[1],
#
# # root dir inode has been allocated
# 1 < sb[1],
#
# ForAll([name0],
# Implies(0 < impl.lookup(parent, name0),
# And(
# impl.lookup(parent, name0) < sb[1],
# imap[Extract(8, 0, impl.lookup(parent, name0))] < sb[0]))))
#
# res = impl.mknod(parent, name, mode)
# if res < 0:
# pass
# else:
# ino = impl.lookup(parent, name)
# v = impl.get_attr(ino)
# self.psolve(pre, v != mode)
if __name__ == '__main__':
test.main()