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test_inode.py
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from dirinode import DirImpl
from yggdrasil import test
from yggdrasil.dirspec import *
OffsetSort = BitVecSort(32)
class ISpec(object):
def __init__(self, start, end):
self._map = FreshUFunction('map', SizeSort, SizeSort)
self._revmap = FreshUFunction('revmap', SizeSort, SizeSort)
self._freemap = FreshUFunction('free', SizeSort, BoolSort())
self._datafn = FreshDiskArray('datafn')
self._start = BitVecVal(start, 32)
self._end = BitVecVal(end, 32)
def alloc(self):
block = FreshSize('alloc')
assertion(self.is_free(block))
self._freemap = self._freemap.update(block, BoolVal(False))
return block
def free(self, block, guard=BoolVal(True)):
self._freemap = self._freemap.update(block, BoolVal(True), guard=guard)
def is_free(self, block):
return self._freemap(block)
def inrange(self, off):
return And(ULE(self._start, off), ULE(off, self._end))
#############
def is_mapped(self, ino, off):
vbn = Concat(ino, off)
block = self._map(vbn)
return And(self.inrange(off), Not(self.is_free(block)), self._revmap(block) == vbn)
#############
def bmap(self, ino, off):
if Or(self.is_mapped(ino, off), Not(self.inrange(off))):
return
vbn = Concat(ino, off)
block = self.alloc()
self._map = self._map.update(vbn, block)
self._revmap = self._revmap.update(block, vbn)
self._datafn = self._datafn.update(block, ConstBlock(0))
def bunmap(self, ino, off):
unmap = self.is_mapped(ino, off)
block = self._map(Concat(ino, off))
self.free(block, guard=unmap)
def _read(self, block):
return self._datafn(block)
def read(self, ino, off):
return If(self.is_mapped(ino, off),
self._read(self._map(Concat(ino, off))), ConstBlock(0))
def _write(self, block, value):
self._datafn = self._datafn.update(block, value)
def write(self, ino, off, value):
if not self.is_mapped(ino, off):
return
self._write(self._map(Concat(ino, off)), value)
class IExtSpec(object):
def __init__(self, dat, ext):
self._dat = dat
self._ext = ext
def alloc(self, *args, **kwargs):
return self._dat.alloc(*args, **kwargs)
def free(self, *args, **kwargs):
return self._dat.free(*args, **kwargs)
def is_free(self, *args, **kwargs):
return self._dat.is_free(*args, **kwargs)
############
def bmap(self, *args, **kwargs):
return self._dat.bmap(*args, **kwargs)
def bunmap(self, *args, **kwargs):
return self._dat.bunmap(*args, **kwargs)
def _read(self, *args, **kwargs):
return self._dat._read(*args, **kwargs)
def _write(self, *args, **kwargs):
return self._dat._write(*args, **kwargs)
def read(self, *args, **kwargs):
return self._dat.read(*args, **kwargs)
def write(self, *args, **kwargs):
return self._dat.write(*args, **kwargs)
###
def ebmap(self, *args, **kwargs):
return self._ext.bmap(*args, **kwargs)
def ebunmap(self, *args, **kwargs):
return self._ext.bunmap(*args, **kwargs)
def eread(self, *args, **kwargs):
return self._ext.read(*args, **kwargs)
def ewrite(self, *args, **kwargs):
return self._ext.write(*args, **kwargs)
def crash(self, *args, **kwargs):
return self
class BlockImpl(object):
def __init__(self, idisk, freedisk, Bitmap, Allocator):
self._idisk = idisk
#########################
def _read(self, block):
return self._idisk._read(block)
def _write(self, block, data):
self._idisk._write(block, data)
def read(self, ino, off):
eoff = Extract(9 - 1, 0, off)
# Off is direct
if UGE(off, 512):
return ConstBlock(0)
imap = self._idisk.eread(ino, BitVecVal(0, 32))
block = imap[eoff]
if self._idisk.is_free(block):
return ConstBlock(0)
return self._read(block)
def write(self, ino, off, value):
eoff = Extract(9 - 1, 0, off)
# Off is direct
if UGE(off, 512):
return ConstBlock(0)
imap = self._idisk.eread(ino, BitVecVal(0, 32))
block = imap[eoff]
if self._idisk.is_free(block):
return ConstBlock(0)
self._write(block, value)
def bmap(self, ino, off):
eoff = Extract(9 - 1, 0, off)
# Off is direct
if UGE(off, 512):
return
imap = self._idisk.eread(ino, BitVecVal(0, 32))
old_lbn = imap[eoff]
# Off is not-mapped
if old_lbn == 0:
lbn = self._idisk.alloc()
self.write(ino, off, ConstBlock(0))
imap[eoff] = lbn
self._idisk.ewrite(ino, BitVecVal(0, 32), imap)
def crash(self, *args, **kwargs):
return self
class ISpecTest(test.RefinementTest):
def create_spec(self, mach):
dat = ISpec(0, 511)
ext = ISpec(0, 0)
return IExtSpec(dat, ext)
def create_impl(self, mach):
dat = ISpec(0, 10)
ext = ISpec(0, 2)
inner = IExtSpec(dat, ext)
freemaparray = FreshDiskArray('freemaparray')
return BlockImpl(inner, AsyncDisk(mach, freemaparray), BitmapSpec, Allocator64)
def equivalence(self, spec, impl, **kwargs):
ino = FreshBitVec('ino', 32)
off = FreshBitVec('off', 32)
return ForAll([ino, off],
spec.read(ino, off) == impl.read(ino, off))
@test.z3_option(AUTO_CONFIG=False)
def match_bmap(self):
ino = FreshBitVec('ino', 32)
off = FreshBitVec('off', 32)
yield (ino, off)
def test_create_spec(self):
ISpec(0, 511)
def test_spec_alloc(self):
spec = ISpec(0, 511)
block = spec.alloc()
self.prove(Not(spec.is_free(block)))
def test_spec_alloc_unalloc(self):
spec = ISpec(0, 511)
block = spec.alloc()
spec.free(block)
self.prove(spec.is_free(block))
def test_spec_bmap_simple(self):
spec = ISpec(0, 511)
ino = FreshIno('ino')
off = FreshBitVec('off', 32)
spec.bunmap(ino, off)
self.prove(Not(spec.is_mapped(ino, off)))
def test_spec_bmap_simple2(self):
spec = ISpec(0, 511)
ino = FreshIno('ino')
off = BitVecVal(0, 32)
spec.bmap(ino, off)
self.pprove(spec.is_mapped(ino, off))
def test_spec_bmap(self):
spec = ISpec(0, 511)
ino = FreshIno('ino')
off = FreshBitVec('off', 32)
block = FreshBlock('block')
assertion(ULT(off, 512))
spec.bmap(ino, off)
spec.write(ino, off, block)
self.pprove(spec.read(ino, off) == block)
if __name__ == '__main__':
test.main()