def test_reset(self):
"""
Tests for CPU reset
"""
e = ElfCPU()
e.load_string('1,0,0,0,99')
e.execute()
e.reset()
# Halted gets cleared
self.assertFalse(e.is_halted)
# Program counter goes to 0
self.assertEqual(e.pc, 0)
# Memory gets wiped so address 1 becomes invalid
with self.assertRaises(ValueError):
e.peek(1)
def test_halt(self):
"""
Tests for the halt op code
"""
e = ElfCPU()
e.load_string('1,0,0,0,99')
e.step()
self.assertFalse(e.is_halted)
e.step()
self.assertTrue(e.is_halted)
def test_invalid_instr(self):
"""
Tests for invalid op code
"""
e = ElfCPU()
e.load_string('123456789')
with self.assertRaises(InvalidInstructionError):
e.execute()
def test_load_string_types(self):
"""
Checks for TypeError
"""
e = ElfCPU()
with self.assertRaises(TypeError):
# noinspection PyTypeChecker
e.load_string(0)
e.load_string('1,2,3,4')
def test_gpf(self):
"""
Tests for a general protection fault by allowing the program counter to
go past the end of the memory.
"""
e = ElfCPU()
# Jump to 2**20, the last memory address
e.load_string('1106,0,1048576')
with self.assertRaises(ProtectionFaultError):
e.execute()
def test_op_add(self):
"""
Tests ADD op code
[dst]:=[a]+[b]
"""
e = ElfCPU()
# Invalid address 123456789 for a
e.load_string('1,123456789,0,0')
with self.assertRaises(ProtectionFaultError):
e.step()
# Invalid address 123456789 for b
e.load_string('1,0,123456789,0')
with self.assertRaises(ProtectionFaultError):
e.step()
# Invalid address 123456789 for dst
e.load_string('1,0,0,123456789')
with self.assertRaises(ProtectionFaultError):
e.step()
# 1 + 1 = 2 @ address 0
e.load_string('1,0,0,0,99')
e.step()
self.assertEqual(e.peek(0), 2)
# 2**64 + 1 = 1 @ address 0 (overflow and wrap)
#e.load_string('1,5,6,0,99,'+str(2**64)+',1')
#e.step()
#self.assertEqual(e.peek(0), 1)
# [dst]:=a+[b]
e.load_string('101,44,5,6,99,2,6')
e.execute()
self.assertEqual(e.peek(6), 46)
# [dst]:=[a]+b
e.load_string('1001,5,50,6,99,2,6')
e.execute()
self.assertEqual(e.peek(6), 52)
# [dst]:=a+b
e.load_string('1101,5,5,6,99,2,6')
e.execute()
self.assertEqual(e.peek(6), 10)
# [dst]:=r[a]+b
e.load_string('109,10,1201,0,5,7,99,7,3,3,5')
e.execute()
self.assertEqual(e.peek(7), 10)
# [dst]:=a+r[b]
e.load_string('109,10,2101,20,0,7,99,7,3,3,10')
e.execute()
self.assertEqual(e.peek(7), 30)
# [dst]:=a+r[b]
e.load_string('109,10,2101,20,0,7,99,7,3,3,10')
e.execute()
self.assertEqual(e.peek(7), 30)
# r[dst]:=a+b
e.load_string('109,10,21101,16,16,0,99,7,3,3,7')
e.execute()
self.assertEqual(e.peek(10), 32)
def test_op_relative_base(self):
"""
Tests the relative base mode op code
"""
e = ElfCPU()
# Position
e.load_string('9,5,204,1,99,6,7,777')
e.interrupts = True
# Step over relative mode op
e.step()
with self.assertRaises(OutputInterrupt):
e.execute()
self.assertEqual(e.output_buffer, 777)
# Immediate
e.reset()
e.load_string('109,5,204,1,99,444,777')
e.interrupts = True
# Step over relative mode op
e.step()
with self.assertRaises(OutputInterrupt):
e.execute()
self.assertEqual(e.output_buffer, 777)
# Relative
e.reset()
e.load_string('209,9,209,6,204,-2,99,5,333,4,6')
e.interrupts = True
e.debug = True
with self.assertRaises(OutputInterrupt):
e.execute()
self.assertEqual(e.output_buffer, 333)
def test_poke(self):
"""
Tests address range and data for poke
"""
e = ElfCPU()
e.load_string('0,1,2,3,4,5,6,7,8,9')
# TypeError
with self.assertRaises(TypeError):
# noinspection PyTypeChecker
e.poke('x', 2)
# Above memory range
with self.assertRaises(ValueError):
e.poke(2**65, 2)
# Below memory range
with self.assertRaises(ValueError):
e.poke(-1, 2)
# Value
with self.assertRaises(ValueError):
e.poke(0, 2**64+1)
self.assertEqual(e.poke(0, 99), 99)
self.assertEqual(e.poke(9, 88), 88)
self.assertEqual(e.peek(0), 99)
self.assertEqual(e.peek(9), 88)
def test_op_eq(self):
"""
Tests equals op code
"""
e = ElfCPU()
"""
Tests if value of address 5 (10) is equal to value
of address 6 (10). Since this is true, write 1 to
address 10.
"""
e.load_string('8,8,9,10,99,10,10,-1,10,10,7')
e.execute()
self.assertEqual(e.peek(10), 1)
"""
Tests if value of address 5 (10) is equal to value
of address 6 (0). Since this is false, write 0 to
address 10.
"""
e.load_string('8,8,9,10,99,10,0,-1,5,6,7')
e.execute()
self.assertEqual(e.peek(10), 0)
"""
Tests if immediate value 10 is equal to immediate value
10. Since this is true, write 1 to address 7.
"""
e.load_string('1108,10,10,7,99,2,3,-1')
e.execute()
self.assertEqual(e.peek(7), 1)
"""
Tests if immediate value of 0 is equal to immediate value
10. Since this is false, write 0 to address 7.
"""
e.load_string('1108,0,10,7,99,2,3,-1')
e.execute()
self.assertEqual(e.peek(7), 0)
"""
if r[a] = r[b]
r[dst]:=1
else
r[dst]:=0
"""
e.load_string('109,10,22208,0,1,2,99,222,222,222,555,555,1')
e.execute()
self.assertEqual(e.peek(12), 1)
"""
if r[a] < r[b]
r[dst]:=1
else
r[dst]:=0
"""
e.load_string('109,10,22208,0,1,2,99,222,222,222,-500,100,1')
e.execute()
self.assertEqual(e.peek(12), 0)
def test_op_cmp_lessthan(self):
"""
Tests compare less than op code
"""
e = ElfCPU()
"""
Tests if value of address 8 (5) is less than value of
address 9 (10). Since this is true write 1 to address 10.
"""
e.load_string('7,8,9,10,99,5,10,-1,5,10,7')
e.execute()
self.assertEqual(e.peek(10), 1)
"""
Tests if value of address 5 (10) is less than value of
address 6 (5). Since this is false write 0 to address 10.
"""
e.load_string('7,8,9,10,99,5,10,-1,10,5,7')
e.execute()
self.assertEqual(e.peek(10), 0)
"""
Tests if immediate value of 5 is less than immediate value of
10. Since this is true write 1 to address 7.
"""
e.load_string('1107,5,10,7,99,0,0,-1')
e.execute()
self.assertEqual(e.peek(7), 1)
"""
Tests if immediate value of 10 is less than immediate value of
5. Since this is false write 0 to address 7.
"""
e.load_string('11107,10,5,7,99,0,0,-1')
e.execute()
self.assertEqual(e.peek(7), 0)
"""
if r[a] < r[b]
r[dst]:=1
else
r[dst]:=0
"""
e.load_string('109,10,22207,0,1,2,99,222,222,222,100,50,1')
e.execute()
self.assertEqual(e.peek(12), 0)
"""
if r[a] < r[b]
r[dst]:=1
else
r[dst]:=0
"""
e.load_string('109,10,22207,0,1,2,99,222,222,222,50,100,1')
e.execute()
self.assertEqual(e.peek(12), 1)
def test_op_jmp_true(self):
"""
Tests jump if true op code
"""
e = ElfCPU()
"""
Tests address 8 (which is 1) if it is non-zero. Since this is
true, it jumps to the value of address 9 (which is 7). This
terminates the program.
"""
e.load_string('5,8,9,1101,1,1,8,99,1,7')
e.execute()
self.assertEqual(e.peek(8), 1)
"""
Tests immediate value 8 if it is non-zero. Since it is
true, jump to immediate address 7 which terminates.
"""
e.load_string('1105,8,7,1101,1,1,8,99,1,7')
e.execute()
self.assertEqual(e.peek(8), 1)
"""
Tests address 8 (which is 0) if it is non-zero. Since this is
false it does not jump and instead adds 1+1 to address 8.
"""
e.load_string('5,8,9999,11101,1,1,8,99,0,7')
e.execute()
self.assertEqual(e.peek(8), 2)
"""
Tests immediate value 0 if it is non-zero. Since it is
false it does not jump and instead adds 1+1 to address 8.
"""
e.load_string('1105,0,9999,11101,1,1,8,99,0,7')
e.execute()
self.assertEqual(e.peek(8), 2)
def test_op_output(self):
"""
Tests output op code
Use io.StringIO() to capture the output
"""
e = ElfCPU()
# Interrupts off
e.load_string('4,5,104,66,99,55,5')
e.interrupts = False
result = None
with patch('sys.stdout', new=io.StringIO()) as output:
e.execute()
result = output.getvalue()
result = result.splitlines()
# First is a reference to memory address 5
self.assertEqual(result[0].strip(), '55')
# Second is an immediate value
self.assertEqual(result[1].strip(), '66')
# Interrupts on
e.load_string('4,5,104,66,99,55,5')
e.interrupts = True
with self.assertRaises(OutputInterrupt):
e.execute()
self.assertEqual(e.output_buffer, 55)
# Don't clear buffer
with self.assertRaises(OutputOverflow):
e.execute()
# Restart test
e.reset()
e.load_string('4,5,104,66,99,55,5')
e.interrupts = True
with self.assertRaises(OutputInterrupt):
e.execute()
self.assertEqual(e.output_buffer, 55)
# Clear buffer
del e.output_buffer
with self.assertRaises(OutputInterrupt):
e.execute()
self.assertEqual(e.output_buffer, 66)
###############################################
# Interrupts on RELATIVE MODE
# Restart test
e.reset()
e.load_string('109,5,204,1,99,6,1234')
e.interrupts = True
with self.assertRaises(OutputInterrupt):
e.execute()
self.assertEqual(e.output_buffer, 1234)
def test_peek(self):
"""
Tests address range for peek
"""
e = ElfCPU()
e.load_string('0,1,2,3,4,5,6,7,8,9')
# TypeError
with self.assertRaises(TypeError):
# noinspection PyTypeChecker
e.peek('x')
# Above memory range
with self.assertRaises(ValueError):
e.peek(2**65)
# Below memory range
with self.assertRaises(ValueError):
e.peek(-1)
self.assertEqual(e.peek(0), 0)
self.assertEqual(e.peek(9), 9)
def test_op_input(self):
"""
Tests input op code
Use unittest.mock.patch to fake the input value
"""
e = ElfCPU()
# Interrupts off
e.load_string('103,3,99,-1')
e.interrupts = False
with patch('builtins.input', return_value='1234'):
e.execute()
self.assertEqual(e.peek(3), 1234)
# Interrupts on IMMEDIATE MODE
e.load_string('103,5,103,5,99,-1')
e.interrupts = True
with self.assertRaises(InputInterrupt):
e.step()
# Should be back at pc = 0
self.assertEqual(e.pc, 0)
# Load input
e.input_buffer = 567
# Loading again overflows
with self.assertRaises(InputOverflow):
e.input_buffer = 123
# Execute the input instruction
e.step()
self.assertEqual(e.peek(5), 567)
# Exec next input instruction
with self.assertRaises(InputInterrupt):
e.step()
e.input_buffer = 987
# Execute until end
e.execute()
self.assertEqual(e.peek(5), 987)
######################################################
# Interrupts on RELATIVE MODE
e.load_string('109,10,203,0,203,1,203,-1,99,102,100,101')
e.interrupts = True
# step past the relative base op code
e.step()
with self.assertRaises(InputInterrupt):
e.step()
# Should be back at pc = 2 (after relative base op code)
self.assertEqual(e.pc, 2)
# Load input
e.input_buffer = 567
# Loading again overflows
with self.assertRaises(InputOverflow):
e.input_buffer = 123
# Execute the input instruction
e.step()
self.assertEqual(e.peek(10), 567)
# Exec next input instruction
with self.assertRaises(InputInterrupt):
e.step()
e.input_buffer = 987
# Step to execute this input
e.step()
self.assertEqual(e.peek(11), 987)
# Exec next input instruction
with self.assertRaises(InputInterrupt):
e.step()
e.input_buffer = 456
# Execute until end
e.execute()
self.assertEqual(e.peek(9), 456)
######################################################
# Interrupts on POSITIONAL MODE
e.load_string('3,7,3,8,3,9,99,1,3,5')
e.interrupts = True
with self.assertRaises(InputInterrupt):
e.step()
# Should be back at pc = 0
self.assertEqual(e.pc, 0)
# Load input
e.input_buffer = 345
# Loading again overflows
with self.assertRaises(InputOverflow):
e.input_buffer = 123
# Execute the input instruction
e.step()
self.assertEqual(e.peek(7), 345)
# Exec next input instruction
with self.assertRaises(InputInterrupt):
e.step()
e.input_buffer = 765
# Step to execute this input
e.step()
self.assertEqual(e.peek(8), 765)
# Exec next input instruction
with self.assertRaises(InputInterrupt):
e.step()
e.input_buffer = 555
# Execute until end
e.execute()
self.assertEqual(e.peek(9), 555)
def test_op_mul(self):
"""
Tests MUL op code
[dst]:=[a]*[b]
"""
e = ElfCPU()
# Invalid address 123456789 for a
e.load_string('2,123456789,0,0')
with self.assertRaises(ProtectionFaultError):
e.step()
# Invalid address 123456789 for b
e.load_string('2,0,123456789,0')
with self.assertRaises(ProtectionFaultError):
e.step()
# Invalid address 123456789 for dst
e.load_string('2,0,0,123456789')
with self.assertRaises(ProtectionFaultError):
e.step()
# [dst]:=[a]*[b]
e.load_string('2,0,0,0,99')
e.step()
self.assertEqual(e.peek(0), 4)
# [dst]:=a*[b]
e.load_string('102,44,5,6,99,2,6')
e.execute()
self.assertEqual(e.peek(6), 88)
# [dst]:=[a]*b
e.load_string('1002,5,50,6,99,2,6')
e.execute()
self.assertEqual(e.peek(6), 100)
# [dst]:=a*b
e.load_string('1102,5,5,6,99,2,6')
e.execute()
self.assertEqual(e.peek(6), 25)
# [dst]:=r[a]*b
e.load_string('109,10,1202,0,4,7,99,7,3,3,4')
e.execute()
self.assertEqual(e.peek(7), 16)
# [dst]:=a*r[b]
e.load_string('109,10,2102,7,0,7,99,7,3,3,2')
e.execute()
self.assertEqual(e.peek(7), 14)
# [dst]:=r[a]*r[b]
e.load_string('109,10,2202,0,1,7,99,7,3,3,2,6')
e.execute()
self.assertEqual(e.peek(7), 12)
# dst:=a*b
e.load_string('11102,6,6,0,99')
e.execute()
self.assertEqual(e.peek(0), 36)
# r[dst]:=a*b
e.load_string('109,7,21102,8,3,0,99,1')
e.execute()
self.assertEqual(e.peek(7), 24)