class IdleVirtualMachine():
def __init__(self, const_quadruples, quadruples, debug=False):
self.__const_quadruples = const_quadruples
self.__quadruples = quadruples
self.__memory_stack = Stack()
self.__next_class_stack = Stack()
self.__debug = debug
curr_class = ClassMemory()
curr_class.era_func(self.__quadruples[0][3])
curr_class.goto_next_func()
self.__memory_stack.push(curr_class)
if self.__debug:
for i in range(0, (len(self.__quadruples))):
print(i, self.__quadruples[i])
@property
def current_memory(self):
return self.__memory_stack.peek()
def run(self):
"""
Executes all of the quads generated during compilation.
"""
instruction_set = {
OperationCode.GOTO: self.run_goto,
OperationCode.GOTOF: self.run_gotof,
OperationCode.GOTOT: self.run_gotot,
OperationCode.ASSIGN: self.run_assign,
OperationCode.ERA: self.run_era,
OperationCode.PARAM: self.run_param,
OperationCode.PARAMREF: self.run_paramref,
OperationCode.GOSUB: self.run_gosub,
OperationCode.RETURN: self.run_return,
OperationCode.ENDPROC: self.run_endproc,
OperationCode.ADD: self.run_add,
OperationCode.SUB: self.run_sub,
OperationCode.MULT: self.run_mult,
OperationCode.DIV: self.run_div,
OperationCode.GT: self.run_gt,
OperationCode.LT: self.run_lt,
OperationCode.GE: self.run_ge,
OperationCode.LE: self.run_le,
OperationCode.EQUAL: self.run_equal,
OperationCode.NOTEQUAL: self.run_not_equal,
OperationCode.AND: self.run_and,
OperationCode.OR: self.run_or,
OperationCode.PRINT: self.run_print,
OperationCode.READFLOAT: self.run_read_float,
OperationCode.READINT: self.run_read_int,
OperationCode.READSTRING: self.run_read_string,
OperationCode.TOSTRING: self.run_to_string,
OperationCode.ARRACCESS: self.run_arr_access,
OperationCode.ARRINDEXCHECK: self.run_arr_index_check,
OperationCode.ARRSORT: self.run_arr_sort,
OperationCode.ARRFIND: self.run_arr_find
}
# Add variables for constants to memory
self.init_consts()
# Execute all quads
next_quad = self.next_instruction()
while next_quad != None:
instruction = instruction_set[OperationCode(next_quad[0])]
instruction(next_quad)
if self.__debug:
print("===== EXECUTED: " + str(next_quad) + " =========")
print(self.current_memory)
next_quad = self.next_instruction()
def init_consts(self):
temp = Memory()
for quad in self.__const_quadruples:
temp.set_value(quad[1], quad[3])
def next_instruction(self):
"""
Gets the next instruction from memory.
"""
counter = self.current_memory.next_instruction()
if counter != None:
return self.__quadruples[counter]
elif self.__memory_stack.size() > 1:
self.__memory_stack.pop()
return self.next_instruction()
return None
# INSTRUCTION SET FUNCTIONS
def run_goto(self, quad):
self.current_memory.goto(quad[3])
def run_gotof(self, quad):
op1 = self.current_memory.get_value(quad[1])
if not op1:
self.current_memory.goto(quad[3])
def run_gotot(self, quad):
op1 = self.current_memory.get_value(quad[1])
if op1:
self.current_memory.goto(quad[3])
def run_assign(self, quad):
if quad[2] == None: # Regular access
value = self.current_memory.get_value(quad[1])
self.current_memory.set_value(value, quad[3])
else: # Instance var access
obj_instance = self.current_memory.get_value(quad[1])
ref = obj_instance.get_reference(quad[2])
self.current_memory.set_reference(ref, quad[3])
def run_era(self, quad):
if quad[2] != None:
obj = self.current_memory.get_value(quad[2])
obj.era_func(quad[1])
self.__next_class_stack.push(obj)
else:
self.current_memory.era_func(quad[1])
def run_param(self, quad):
value = self.current_memory.get_value(quad[1])
if not self.__next_class_stack.isEmpty():
self.__next_class_stack.peek().send_param(value, quad[3])
else:
self.current_memory.send_param(value, quad[3])
def run_paramref(self, quad):
reference = self.current_memory.get_reference(quad[1])
if not self.__next_class_stack.isEmpty():
self.__next_class_stack.peek().send_param_by_ref(
reference, quad[3])
else:
self.current_memory.send_param_by_ref(reference, quad[3])
def run_gosub(self, quad):
if not self.__next_class_stack.isEmpty():
self.__memory_stack.push(self.__next_class_stack.pop())
self.current_memory.goto_next_func()
def run_return(self, quad):
value = self.current_memory.get_value(quad[1])
# If there is another function in stack, it means it will return to that function within class
if self.current_memory.can_return():
counter = self.current_memory.prev_func_last_instruction()
address = self.__quadruples[counter][3]
self.current_memory.return_value(value, address)
else: # Return of object function call
prev_class = self.__memory_stack.peek_next_to_last()
counter = prev_class.curr_func_last_instruction()
address = self.__quadruples[counter][3]
prev_class.set_value(value, address)
self.run_endproc()
def run_endproc(self, quad=None):
self.current_memory.end_func()
def run_add(self, quad):
op1 = self.current_memory.get_value(quad[1])
op2 = self.current_memory.get_value(quad[2])
self.current_memory.set_value(op1 + op2, quad[3])
def run_sub(self, quad):
op1 = self.current_memory.get_value(quad[1])
op2 = self.current_memory.get_value(quad[2])
self.current_memory.set_value(op1 - op2, quad[3])
def run_mult(self, quad):
op1 = self.current_memory.get_value(quad[1])
op2 = self.current_memory.get_value(quad[2])
self.current_memory.set_value(op1 * op2, quad[3])
def run_div(self, quad):
op1 = self.current_memory.get_value(quad[1])
op2 = self.current_memory.get_value(quad[2])
if op2 == 0:
print("Runtime Error: Division by 0.")
exit()
if isinstance(op1, int) and isinstance(op2, int):
self.current_memory.set_value(op1 // op2, quad[3])
else:
self.current_memory.set_value(op1 / op2, quad[3])
def run_gt(self, quad):
op1 = self.current_memory.get_value(quad[1])
op2 = self.current_memory.get_value(quad[2])
self.current_memory.set_value(op1 > op2, quad[3])
def run_lt(self, quad):
op1 = self.current_memory.get_value(quad[1])
op2 = self.current_memory.get_value(quad[2])
self.current_memory.set_value(op1 < op2, quad[3])
def run_equal(self, quad):
op1 = self.current_memory.get_value(quad[1])
op2 = self.current_memory.get_value(quad[2])
self.current_memory.set_value(op1 == op2, quad[3])
def run_ge(self, quad):
op1 = self.current_memory.get_value(quad[1])
op2 = self.current_memory.get_value(quad[2])
self.current_memory.set_value(op1 >= op2, quad[3])
def run_le(self, quad):
op1 = self.current_memory.get_value(quad[1])
op2 = self.current_memory.get_value(quad[2])
self.current_memory.set_value(op1 <= op2, quad[3])
def run_not_equal(self, quad):
op1 = self.current_memory.get_value(quad[1])
op2 = self.current_memory.get_value(quad[2])
self.current_memory.set_value(op1 != op2, quad[3])
def run_and(self, quad):
op1 = self.current_memory.get_value(quad[1])
op2 = self.current_memory.get_value(quad[2])
self.current_memory.set_value(op1 and op2, quad[3])
def run_or(self, quad):
op1 = self.current_memory.get_value(quad[1])
op2 = self.current_memory.get_value(quad[2])
self.current_memory.set_value(op1 or op2, quad[3])
def run_print(self, quad):
op1 = self.current_memory.get_value(quad[1])
if isinstance(op1, bool):
op1 = str(op1).lower()
print(op1)
def run_read_float(self, quad):
op1 = input()
try:
op1 = float(op1)
except ValueError:
print("Runtime Error: Expected float.")
exit()
self.current_memory.set_value(op1, quad[3])
def run_read_int(self, quad):
op1 = input()
try:
op1 = int(op1)
except ValueError:
print("Runtime Error: Expected int.")
exit()
self.current_memory.set_value(op1, quad[3])
def run_read_string(self, quad):
op1 = str(input())
self.current_memory.set_value(op1, quad[3])
def run_to_string(self, quad):
value = self.current_memory.get_value(quad[1])
string_value = str(value)
self.current_memory.set_value(string_value, quad[3])
def run_arr_access(self, quad):
base_address = quad[1]
arr_index = self.current_memory.get_value(quad[2])
address = base_address + arr_index * 100
# RUNTIME ERROR index out of bounds
self.current_memory.set_pointer_address(quad[3], address)
def run_arr_index_check(self, quad):
lower_limit = quad[1]
upper_limit = quad[2]
index = self.current_memory.get_value(quad[3])
if index < lower_limit or index > upper_limit:
print("Runtime Error: Array index out of bounds.")
exit()
def run_arr_sort(self, quad):
base_address = quad[3]
start_address = base_address + quad[1][0] * 100
end_address = base_address + quad[1][1] * 100
array = self.current_memory.get_memory_slice(start_address,
end_address)
array.sort()
if quad[2] == "desc":
array.reverse()
self.current_memory.set_memory_slice(array, start_address, end_address)
def run_arr_find(self, quad):
base_address = quad[2][1]
start_address = base_address + quad[1][0] * 100
end_address = base_address + quad[1][1] * 100
value = self.current_memory.get_value(quad[2][0])
array = self.current_memory.get_memory_slice(start_address,
end_address)
value_index = -1
for index, item in enumerate(array):
if item == value:
value_index = index
break
self.current_memory.set_value(value_index, quad[3])
class ClassMemory(Memory):
def __init__(self):
super().__init__()
self.__func_memory_stack = Stack()
self.__next_func = Stack()
def set_reference(self, reference, address):
if self.get_type(address) == DataType.POINTER:
actual_address = self.__func_memory_stack.peek().get_value(address)
self.set_reference(reference, actual_address)
elif address % 10 == CompilationMemory.INSTANCE_ID:
super().set_reference(reference, address)
else:
self.__func_memory_stack.peek().set_reference(reference, address)
def get_reference(self, address):
if self.get_type(address) == DataType.POINTER:
actual_address = self.__func_memory_stack.peek().get_value(address)
return self.get_reference(actual_address)
elif address % 10 == CompilationMemory.INSTANCE_ID:
return super().get_reference(address)
else:
return self.__func_memory_stack.peek().get_reference(address)
def set_value(self, value, address):
if self.get_type(address) == DataType.POINTER:
actual_address = self.__func_memory_stack.peek().get_value(address)
self.set_value(value, actual_address)
elif address % 10 == CompilationMemory.INSTANCE_ID:
super().set_value(value, address)
else:
self.__func_memory_stack.peek().set_value(value, address)
def get_value(self, address):
if self.get_type(address) == DataType.POINTER:
actual_address = self.__func_memory_stack.peek().get_value(address)
return self.get_value(actual_address)
if address % 10 == CompilationMemory.INSTANCE_ID:
return super().get_value(address)
else:
return self.__func_memory_stack.peek().get_value(address)
def set_pointer_address(self, pointer_address, pointing_address):
self.__func_memory_stack.peek().set_value(pointing_address, pointer_address)
def era_func(self, func_start):
self.__next_func.push(LocalMemory(func_start))
def send_param(self, value, address):
self.__next_func.peek().set_value(value, address)
def send_param_by_ref(self, reference, address):
self.__next_func.peek().set_reference(reference, address)
def can_return(self):
return self.__func_memory_stack.size() > 1
def curr_func_last_instruction(self):
return self.__func_memory_stack.peek().last_instruction
def prev_func_last_instruction(self):
return self.__func_memory_stack.peek_next_to_last().last_instruction
def return_value(self, value, address):
self.__func_memory_stack.peek_next_to_last().set_value(value, address)
def goto_next_func(self):
self.__func_memory_stack.push(self.__next_func.pop())
def end_func(self):
self.__func_memory_stack.pop()
def next_instruction(self):
if self.__func_memory_stack.peek() != None:
return self.__func_memory_stack.peek().next_instruction()
return None
def goto(self, counter):
self.__func_memory_stack.peek().goto(counter)
def __str__(self):
representation = "----------------------\n"
representation += "CLASS MEMORY:\n"
representation += super().__str__() + "\n"
representation += "\nFUNCTION MEMORY:\n"
for fnc in self.__func_memory_stack.items:
representation += fnc.__str__() + "\n"
representation += "\nNEXT FUNCTIONS:\n"
for fnc in self.__next_func.items:
representation += fnc.__str__() + "\n"
representation += "CONSTANTS:\n"
representation += self.CONSTANTS.__str__() + "\n"
representation += "----------------------\n"
return representation
