def sext(self, ctx, return_type, a, atype, **kwargs):
outsize = itypes.integer_size(return_type)
insize = itypes.integer_size(atype)
assert outsize > insize
if z3.is_bool(a):
return util.If(a, z3.BitVecVal(1, outsize),
z3.BitVecVal(0, outsize))
return z3.SignExt(outsize - insize, a)
def select(self, ctx, return_type, cond, cond_type, trueval, trueval_type,
falseval, falseval_type):
self.assertion(ctx, not cond.is_poison(), "path condition is poison")
assert itypes.integer_size(cond_type) == 1
assert return_type == trueval_type
assert trueval_type == falseval_type
return util.If(cond, trueval, falseval)
def branch(self, ctx, cond, cond_type, iftrue, iffalse):
self.assertion(ctx, not cond.is_poison(), "path condition is poison")
assert itypes.integer_size(cond_type) == 1
scond = util.simplify(cond)
can_be_true = not z3.is_false(scond)
can_be_false = not z3.is_true(scond)
if ctx['depth'] >= ctx['prune_depth']:
can_be_true = not z3.is_false(
scond) and not util.path_condition_implies(ctx, z3.Not(scond))
can_be_false = not can_be_true or (
not z3.is_true(scond)
and not util.path_condition_implies(ctx, scond))
true_branch_exc = None
false_branch_exc = None
trueval = None
falseval = None
if can_be_true:
try:
ctx.push(path_condition=scond)
trueval = iftrue()
except ex.UnreachableException, e:
stacktrace = getattr(e, 'stacktrace', None)
self.assertion(ctx,
util.path_condition_implies(ctx,
z3.BoolVal(False),
print_model=True),
"Panic " + repr(e),
stacktrace=stacktrace)
can_be_true = False
except BaseException, e:
true_branch_exc = e
def trunc(self, ctx, return_type, a, atype, **kwargs):
outsize = itypes.integer_size(return_type)
insize = itypes.integer_size(atype)
assert insize > outsize
return z3.Extract(outsize - 1, 0, a)
