/
test_dirspec.py
309 lines (227 loc) · 10.7 KB
/
test_dirspec.py
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from dirinode import DirImpl
from dirspec import *
from yggdrasil import test
class DirRefinementTest(test.RefinementTest):
def create_spec(self, mach):
dirfn = FreshUFunction('dirfn', InoSort, NameSort, InoSort)
direxists = FreshUFunction('direxists', InoSort, NameSort, BoolSort())
datafn = FreshUFunction('datafn', InoSort, BitVecSort(32), BlockOffsetSort, SizeSort)
ifree = FreshUFunction('ifreefn', InoSort, BoolSort())
attrs = FreshAttributes()
return DirSpec(mach, dirfn, direxists, datafn, ifree, attrs)
def create_impl(self, mach):
mappedarray = FreshDiskArray('mappedarray')
attr_array = FreshDiskArray('attrs', domain=BitVecSort(32))
diskarray = FreshDiskArray('diskarray')
ifreearray = FreshDiskArray('ifreearray', domain=BitVecSort(32))
orphans = FreshDiskArray('orphans')
inode = InodeSpec(mach, [mappedarray, attr_array, diskarray, None, ifreearray, orphans])
return DirImpl(inode, inode, Allocator32, BitmapSpec, DirLook)
def equivalence(self, spec, impl, **kwargs):
ino = FreshIno('ino-pre')
blocknum = FreshBitVec('blocknum-pre', 32)
off = FreshBitVec('off-pre', BlockOffsetSort.size())
mapped_block = FreshBitVec('mapped-block-pre', 32)
return ForAll([ino, mapped_block, blocknum, off], And(
# The bsize of an inode should not overflow when multiplied by 4k
ULT(spec._attrs.bsize(ino), 1048576),
ULE(spec._attrs.fsize(ino), spec._attrs.bsize(ino) * 4096),
Implies(ULT(0, spec._attrs.bsize(ino)),
ULT(spec._attrs.bsize(ino) * 4096 - 4096, spec._attrs.fsize(ino))),
impl.is_valid(ino) == spec.is_valid(ino),
# GCable
Implies(impl.is_gcable(ino),
And(
spec._ifreefn(ino),
spec._attrs.bsize(ino) == 0,
spec._attrs.nlink(ino) == 0,
spec.read(ino, blocknum, off) == 0)),
# General inode properties
Implies(spec.is_valid(ino), And(
spec.get_iattr(ino) == impl.get_iattr(ino))),
Implies(
impl.is_ifree(ino),
Not(impl._inode.is_mapped(Concat(ino, mapped_block)))),
Implies(ULE(impl.get_iattr(ino).bsize, mapped_block),
Not(impl._inode.is_mapped(Concat(ino, mapped_block)))),
# Non-directory properties
Implies(Not(spec.is_dir(ino)), And(
Implies(Not(impl.is_gcable(ino)),
spec.read(ino, blocknum, off) == impl.read(ino, blocknum)[off]),
)),
))
def call_mknod(self, spec, impl, args):
i1 = spec.mknod(*args)
i2, err2 = impl.mknod(*args)
assertion(i1 != 0)
assertion(i1 == i2)
@test.z3_option(AUTO_CONFIG=False)
def match_mknod(self):
parent0 = FreshIno('parent')
name0 = [FreshName('name-pre') for _ in range(16)]
mode = FreshSize('mode')
mtime = FreshSize('mtime')
yield (parent0, name0, mode, mtime)
# @test.z3_option(AUTO_CONFIG=True)
# def match_write(self):
# ino0 = FreshIno('ino0-write')
# blocknum0 = BitVec('blocknum0-write', 32)
# v0 = FreshBlock('v0-write')
#
# yield (ino0, blocknum0, v0)
@test.z3_option(AUTO_CONFIG=False)
def match_rename(self):
oparent0 = FreshIno('oparent0-write')
nparent0 = FreshIno('nparent0-write')
oname0 = [FreshName('oname0-write') for _ in range(16)]
nname0 = [FreshName('nname0-write') for _ in range(16)]
yield (oparent0, oname0, nparent0, nname0)
def call_unlink(self, spec, impl, args):
i1 = spec.unlink(*args)
i2 = impl.unlink(*args)
assertion(i1 != 0)
assertion(i1 == i2)
@test.z3_option(AUTO_CONFIG=False)
def match_unlink(self):
parent0 = FreshIno('parent0')
name0 = [FreshName('name0') for _ in range(16)]
yield (parent0, name0)
def call_rmdir(self, spec, impl, args):
i1, err1 = spec.rmdir(*args)
i2, err2 = impl.rmdir(*args)
assertion(err1 == err2)
assertion(Implies(err1 == 0, i1 != 0))
assertion(i1 == i2)
@test.z3_option(AUTO_CONFIG=False)
def match_rmdir(self):
parent0 = FreshIno('parent0')
name0 = [FreshName('name0') for _ in range(16)]
yield (parent0, name0)
@test.z3_option(AUTO_CONFIG=False)
def match_forget(self):
ino0 = FreshIno('ino0')
yield (ino0,)
@test.z3_option(AUTO_CONFIG=False)
def nop_gc1(self):
orph_index0 = FreshIno('orph_index0')
block_off0 = FreshIno('block_off')
yield(orph_index0, block_off0)
@test.z3_option(AUTO_CONFIG=False)
def nop_gc2(self):
orph_index0 = FreshIno('orph_index0')
yield(orph_index0,)
@test.z3_option(AUTO_CONFIG=False)
def nop_gc3(self):
yield ()
class DirRefinement(test.RefinementTest):
def create_spec(self, mach):
dirfn = FreshUFunction('dirfn', InoSort, NameSort, InoSort)
direxists = FreshUFunction('direxists', InoSort, NameSort, BoolSort())
datafn = FreshUFunction('datafn', InoSort, BitVecSort(32), BlockOffsetSort, SizeSort)
ifree = FreshUFunction('ifreefn', InoSort, BoolSort())
attrs = FreshAttributes()
return DirSpec(mach, dirfn, direxists, datafn, ifree, attrs)
def create_impl(self, mach):
mappedarray = FreshDiskArray('mappedarray')
attr_array = FreshDiskArray('attrs', domain=BitVecSort(32))
diskarray = FreshDiskArray('diskarray')
ifreearray = FreshDiskArray('ifreearray', domain=BitVecSort(32))
orphans = FreshDiskArray('orphans')
inode = InodeSpec(mach, [mappedarray, attr_array, diskarray, None, ifreearray, orphans])
return DirImpl(inode, inode, Allocator32, BitmapSpec, DirLook)
def test_match_write(self):
spec_mach = Machine()
spec = self.create_spec(spec_mach)
impl_mach = Machine()
impl = self.create_impl(impl_mach)
ino = FreshIno('ino-pre')
blocknum = FreshBitVec('blocknum-pre', 32)
off = FreshBitVec('off-pre', BlockOffsetSort.size())
mapped_block = FreshBitVec('mapped-block-pre', 32)
pre = ForAll([ino], And(
# The bsize of an inode should not overflow when multiplied by 4k
ULT(spec._attrs.bsize(ino), 1048576),
ULE(spec._attrs.fsize(ino), spec._attrs.bsize(ino) * 4096),
Implies(ULT(0, spec._attrs.bsize(ino)),
ULT(spec._attrs.bsize(ino) * 4096 - 4096, spec._attrs.fsize(ino))),
spec.is_valid(ino) == impl.is_valid(ino),
# GCable
Implies(impl.is_gcable(ino),
And(
spec._ifreefn(ino),
spec._attrs.bsize(ino) == 0,
spec._attrs.nlink(ino) == 0,
spec.read(ino, blocknum, off) == 0)),
# General inode properties
Implies(spec.is_valid(ino), And(
spec.get_iattr(ino) == impl.get_iattr(ino))),
ForAll([mapped_block], Implies(
impl.is_ifree(ino),
Not(impl._inode.is_mapped(Concat(ino, mapped_block))))),
# Non-directory properties
Implies(Not(spec.is_dir(ino)), And(
Implies(Not(impl.is_gcable(ino)), spec.read(ino, blocknum, off) == impl.read(ino, blocknum)[off]),
ForAll([mapped_block],
Implies(ULE(impl.get_iattr(ino).bsize, mapped_block),
Not(impl._inode.is_mapped(Concat(ino, mapped_block))))),
)),
# Directory properties
Implies(spec.is_dir(ino), And(
# spec.lookup(ino, name) == impl.lookup(ino, name))),
))
))
# self.show(And(*assertion.assertions), pre, AUTO_CONFIG=False)
#########################
ino0 = FreshIno('ino0-write')
blocknum0 = BitVec('blocknum0-write', 32)
size0 = BitVec('size0-write', 32)
v0 = FreshBlock('v0-write')
spec.write(ino0, blocknum0, v0, size0)
impl.write(ino0, blocknum0, v0, size0)
################
spec = spec.crash(Machine())
impl = impl.crash(Machine())
###############
# ino = FreshIno('ino-post')
post = ForAll([ino], And(
# The bsize of an inode should not overflow when multiplied by 4k
ULT(spec._attrs.bsize(ino), 1048576),
ULE(spec._attrs.fsize(ino), spec._attrs.bsize(ino) * 4096),
Implies(ULT(0, spec._attrs.bsize(ino)),
ULT(spec._attrs.bsize(ino) * 4096 - 4096, spec._attrs.fsize(ino))),
spec.is_valid(ino) == impl.is_valid(ino),
# GCable
Implies(impl.is_gcable(ino),
And(
spec._ifreefn(ino),
spec._attrs.bsize(ino) == 0,
spec._attrs.nlink(ino) == 0,
spec.read(ino, blocknum, off) == 0)),
# General inode properties
Implies(spec.is_valid(ino), And(
spec.get_iattr(ino) == impl.get_iattr(ino))),
ForAll([mapped_block], Implies(
impl.is_ifree(ino),
Not(impl._inode.is_mapped(Concat(ino, mapped_block))))),
# Non-directory properties
Implies(Not(spec.is_dir(ino)), And(
Implies(Not(impl.is_gcable(ino)), spec.read(ino, blocknum, off) == impl.read(ino, blocknum)[off]),
ForAll([mapped_block],
Implies(ULE(impl.get_iattr(ino).bsize, mapped_block),
Not(impl._inode.is_mapped(Concat(ino, mapped_block))))),
)),
))
opt = {
'AUTO_CONFIG': False,
}
# self.psolve(Not(Implies(pre, post)), **opt)
assumption = And(spec_mach.assumption, impl_mach.assumption, *assertion.assertions)
# print z3.simplify(assumption)
model = self._solve(assumption,
ForAll(spec_mach.control, Not(Implies(pre, post))), **opt)
if model:
print 'Spec read', model.eval(spec.read(ino, blocknum, off))
print 'Impl read', model.eval(impl.read(ino, blocknum)[off])
self.assertIsNone(model)
if __name__ == '__main__':
test.main()