def test_jge(self):
"""
Jump iff sign flag is 0.
"""
for i in range(NUM_TESTS):
intel_machine.re_init()
label_addr = random.randint(FIRST_INST_ADDRESS, MAX_INSTRUCTIONS)
intel_machine.labels["test_label"] = label_addr
sign_flag = random.getrandbits(1)
intel_machine.flags["SF"] = sign_flag
assemble("jge test_label", intel_machine)
if (not sign_flag):
self.assertEqual(intel_machine.get_ip(), label_addr)
else:
self.assertEqual(intel_machine.get_ip(), 1)
def test_je(self):
"""
Jump iff zero flag is 1.
"""
for i in range(NUM_TESTS):
intel_machine.re_init()
label_addr = random.randint(FIRST_INST_ADDRESS, MAX_INSTRUCTIONS)
intel_machine.labels["test_label"] = label_addr
zero_flag = random.getrandbits(1)
intel_machine.flags["ZF"] = zero_flag
assemble("je test_label", 'intel', intel_machine)
if (zero_flag):
self.assertEqual(intel_machine.get_ip(), label_addr)
else:
self.assertEqual(intel_machine.get_ip(), 1)
def test_call(self):
"""
Tests call.
At the time of writing this test
blank lines are skipped by the tokenizer.
In order to have emu jump to the location of label_addr,
we have to make no-op lines to assign the correct locations
to the lines we test.
"""
for i in range(NUM_TESTS):
intel_machine.re_init()
intel_machine.base = "dec"
call_instr_addr = random.randint(FIRST_INST_ADDRESS,
MAX_INSTRUCTIONS)
label_addr = random.randint(FIRST_INST_ADDRESS, MAX_INSTRUCTIONS)
code_to_run = [NO_OP] * (MAX_INSTRUCTIONS + 1)
code_to_run[call_instr_addr] = "call " + TEST_LABEL + "\n"
prev_label_info = code_to_run[label_addr]
code_to_run[label_addr] = TEST_LABEL + ": " + prev_label_info
intel_machine.labels[TEST_LABEL] = label_addr
intel_machine.set_ip(call_instr_addr)
# We step once through the code, executing only `call`.
assemble("".join(code_to_run), 'att', intel_machine, step=True)
self.assertEqual(intel_machine.get_ip(), label_addr)
def test_jg(self):
"""
Jump iff both sign flag and zero flag are 0.
"""
for i in range(NUM_TESTS):
intel_machine.re_init()
label_addr = random.randint(FIRST_INST_ADDRESS, MAX_INSTRUCTIONS)
intel_machine.labels["test_label"] = label_addr
sign_flag = random.getrandbits(1)
zero_flag = random.getrandbits(1)
intel_machine.flags["SF"] = sign_flag
intel_machine.flags["ZF"] = zero_flag
assemble("jg test_label", 'att', intel_machine)
if ((not zero_flag) and (not sign_flag)):
self.assertEqual(intel_machine.get_ip(), label_addr)
else:
self.assertEqual(intel_machine.get_ip(), 1)
def test_jle(self):
"""
Jump iff either sign flag or zero flag are 1.
"""
for i in range(NUM_TESTS):
intel_machine.re_init()
intel_machine.base = "dec"
label_addr = random.randint(FIRST_INST_ADDRESS, MAX_INSTRUCTIONS)
intel_machine.labels["test_label"] = label_addr
sign_flag = random.getrandbits(1)
zero_flag = random.getrandbits(1)
intel_machine.flags["SF"] = sign_flag
intel_machine.flags["ZF"] = zero_flag
assemble("jle test_label", 'att', intel_machine)
if (zero_flag or sign_flag):
self.assertEqual(intel_machine.get_ip(), label_addr)
else:
self.assertEqual(intel_machine.get_ip(), 1)
def test_jmp(self):
"""
Jump to a random location from 1 to MAX_INSTRUCTIONS.
Assert IP is set to that location by jump.
"""
for i in range(NUM_TESTS):
intel_machine.re_init()
label_addr = random.randint(FIRST_INST_ADDRESS, MAX_INSTRUCTIONS)
intel_machine.labels["test_label"] = label_addr
assemble("jmp test_label", intel_machine)
self.assertEqual(intel_machine.get_ip(), label_addr)
