def while2() -> None:
"""While with high guard."""
Requires(LowEvent())
x = input_low()
while x != 0:
x = x - 1
sif_print(1)
def while3() -> None:
"""Termination leak."""
x = input_high()
while x != 0:
x = x - 1
#:: ExpectedOutput(call.precondition:assertion.false)
sif_print(1)
def fig1a() -> None:
x = input_high()
if x < 1234:
x = 0
y = x
#:: ExpectedOutput(call.precondition:assertion.false)
sif_print(y)
def fig2b() -> None:
h = input_high()
l = input_low()
x = f(h)
y = f(l)
#:: ExpectedOutput(call.precondition:assertion.false)
sif_print(x)
def fig2b_low() -> None:
Requires(LowEvent())
h = input_high()
l = input_low()
x = f(h)
y = f(l)
sif_print(y)
def fig1a_low() -> None:
Requires(LowEvent())
x = input_low()
if x < 1234:
sif_print(0)
y = x
sif_print(y)
def test_high_ref() -> None:
Requires(LowEvent())
h = high_ref()
l = low_ref()
l.append(1)
sif_print(1)
h.append(2)
sif_print(2)
def test_high_data() -> None:
Requires(LowEvent())
x = input_high()
y = input_low()
l = [1, y]
l.append(x)
sif_print(l[1])
#:: ExpectedOutput(call.precondition:assertion.false)
sif_print(l[2])
def fig2a() -> None:
x = input_high()
if x == 1:
l = 42
else:
l = 17
l = 0
#:: ExpectedOutput(call.precondition:assertion.false)
sif_print(l)
def test_high_index(low_idx: int, high_idx:int) -> None:
Requires(LowEvent())
Requires(low_idx >=0 and low_idx < 3)
Requires(Low(low_idx))
Requires(high_idx >=0 and high_idx < 3)
Requires(Low(high_idx >= 0 and high_idx < 3))
l = [1, 2, 3]
sif_print(l[low_idx])
#:: ExpectedOutput(call.precondition:assertion.false)
sif_print(l[high_idx])
def test_contains() -> None:
Requires(LowEvent())
x = input_high()
y = input_low()
l = [1, 2, 3]
if y in l:
sif_print(0)
if x in l:
#:: ExpectedOutput(call.precondition:assertion.false)
sif_print(1)
def while5() -> None:
"""Nested while."""
h = input_high()
l = input_low()
i = 0
while l != 0:
while h != 0:
i = i + 1
h = h - 1
l = l - 1
#:: ExpectedOutput(call.precondition:assertion.false)
sif_print(i)
def while1() -> int:
"""While with low guard."""
Requires(LowEvent())
i = input_low()
sum = 0
while i != 0:
Invariant(Low(i))
Invariant(Low(sum))
sum = sum + 1
i = i - 1
sif_print(sum)
return sum
def while4() -> int:
"""While with pure guard."""
Requires(LowEvent())
Ensures(Result() == 10)
i = 15
sum = 0
while m1(i):
Invariant(sum == 15 - i)
Invariant(Low(i))
Invariant(Low(m1(i)))
Invariant(Low(sum))
sum = sum + 1
i = i - 1
sif_print(sum)
return sum
def test_contains_2() -> None:
Requires(LowEvent())
x = input_high()
l = [1, 2, 3]
b = x in l
sif_print(l[0])