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icg.py
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icg.py
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from scanner import Scanner, Token, TokenType
from symbol_table import FuncOrVar, SymbolTable, SymbolTableRow, SymbolTableRowType
from utils import write_three_address_codes_to_file, write_semantic_errors
from function_table import FunctionTable
class IntermidateCodeGenerator:
def __init__(self, symbol_table: SymbolTable, scanner: Scanner) -> None:
self.semantic_stack = []
self.semantic_errors = []
self.three_addres_codes = {}
self.i = 0
self.debug = False
self.function_table = FunctionTable(symbol_table)
self.symbol_table: SymbolTable = symbol_table
self.scanner: Scanner = scanner
self.current_function_address = None
self.arg_counter = -1
self.func_call_stack = []
self.main_added = False
self.is_inside_function_declaration = False
self.retrun_temp = self.symbol_table.get_temp()
self.jump_to_main_line_number = None
self.is_output_added = False
self.init_program()
def init_program(self):
self.add_three_address_code(f"(ASSIGN, #0, {self.retrun_temp}, )")
def add_output_function(self) -> None:
self.symbol_table.insert("output", is_declred=True)
output_row = self.symbol_table.get_row("output")
output_input_param = self.symbol_table.get_temp()
self.function_table.func_declare(output_row, output_row.address, "void")
self.function_table.add_param(
output_row.address, "a", "int", output_input_param, False
)
self.function_table.funcs[output_row.address]["start_address"] = self.i
self.add_three_address_code(f"(PRINT, {output_input_param}, ,)")
self.add_three_address_code(f"(JP, @{self.retrun_temp}, , )")
# functions
def code_gen(self, action_symbol, current_token: Token):
if self.debug:
print(
self.semantic_stack,
action_symbol,
current_token.lexeme,
self.scanner.line_number,
self.i,
)
getattr(self, action_symbol)(current_token)
def add_three_address_code(
self, text: str, index: int = None, increase_i: bool = True
) -> None:
self.three_addres_codes[index if index else self.i] = text
self.i += 1 if increase_i else 0
def add_error(self, error_text) -> None:
self.semantic_errors.append(f"#{self.scanner.line_number} : " + error_text)
def is_in_main(self):
return (
self.function_table.funcs[self.current_function_address]["name"].lexeme
== "main"
)
def save_to_file(self):
if self.debug:
print("ss stack at the end : ", self.semantic_stack)
print("Symbol table : ", self.symbol_table.table)
print("Stack is : ", self.symbol_table.table)
if len(self.semantic_errors) != 0:
self.three_addres_codes = {}
write_three_address_codes_to_file(self.three_addres_codes)
write_semantic_errors(self.semantic_errors)
def func_arg_is_array(self, arg_address):
current_func_info = self.function_table.funcs[self.current_function_address]
if arg_address not in current_func_info["params_address"]:
return False
arg_index = current_func_info["params_address"].index(arg_address)
return current_func_info["params_array"][arg_index]
def end_of_declaration(self, current_token: Token):
if not self.is_output_added:
self.jump_to_main_line_number = self.i
self.add_three_address_code("", increase_i=True) # for later jp to main
self.add_output_function()
self.is_output_added = True
# Actions
def padd(self, current_token: Token):
if current_token.type == TokenType.ID.name:
self.semantic_stack.append(
self.symbol_table.get_address(current_token.lexeme)
)
elif current_token.type == TokenType.NUM.name:
self.semantic_stack.append(f"#{current_token.lexeme}")
elif current_token.type == TokenType.SYMBOL.name:
self.semantic_stack.append(current_token.lexeme)
def assign(self, current_token: Token):
src = self.semantic_stack.pop()
dst = self.semantic_stack[-1]
self.add_three_address_code(f"(ASSIGN, {src}, {dst}, )")
def op(self, current_token: Token):
operand_map = {"+": "ADD", "-": "SUB", "*": "MULT", "<": "LT", "==": "EQ"}
second_operand = self.semantic_stack.pop()
operand = operand_map[self.semantic_stack.pop()]
first_operand = self.semantic_stack.pop()
self.check_operand_missmatch(first_operand, second_operand)
op_result = self.symbol_table.get_temp()
self.add_three_address_code(
f"({operand}, {first_operand}, {second_operand}, {op_result})"
)
self.semantic_stack.append(op_result)
def label(self, current_token: Token):
self.semantic_stack.append(self.i)
def until(self, current_token: Token):
condition = self.semantic_stack.pop()
target = self.semantic_stack.pop()
self.add_three_address_code(f"(JPF, {condition}, {target}, )")
def jp(self, current_token: Token):
self.add_three_address_code(
f"(JP, {self.i}, , )", index=self.semantic_stack.pop(), increase_i=False
)
def jpf_save(self, current_token: Token):
pb_empty_place = self.semantic_stack.pop()
condition = self.semantic_stack.pop()
self.semantic_stack.append(self.i)
self.add_three_address_code(
text=f"(JPF, {condition}, {self.i + 1}, )", index=pb_empty_place
)
def jpf(self, current_token: Token):
pb_empty_place = self.semantic_stack.pop()
condition = self.semantic_stack.pop()
self.add_three_address_code(
text=f"(JPF, {condition}, {self.i}, )",
index=pb_empty_place,
increase_i=False,
)
def save(self, current_token: Token):
self.semantic_stack.append(self.i)
self.i += 1
def declare_function(self, current_token: Token):
self.is_inside_function_declaration = True
function_address = self.semantic_stack[-1]
function_row = self.symbol_table.reverse_address(function_address)
function_row.is_declred = True
function_row.func_or_var = FuncOrVar.func
self.function_table.func_declare(function_row, function_address, "void")
if function_row.lexeme == "main":
self.add_three_address_code(
f"(JP, {self.i}, , )",
index=self.jump_to_main_line_number,
increase_i=False,
)
self.main_added = True
self.function_table.func_declare(
function_row, function_address, self.semantic_stack[-2]
)
self.current_function_address = function_address
def var(self, current_token: Token):
var = self.semantic_stack.pop()
var_type = self.semantic_stack.pop()
self.add_three_address_code(f"(ASSIGN, #0, {var}, )")
def declare_arr(self, current_token: Token):
size = int(self.semantic_stack.pop()[1:]) # remove # from int
var = self.semantic_stack.pop()
var_type = self.semantic_stack.pop()
for i in range(size + 1):
self.add_three_address_code(f"(ASSIGN, #0, {var + i * 4}, )")
self.symbol_table.get_temp()
def push_int(self, current_token: Token):
self.semantic_stack.append("int")
def push_void(self, current_token: Token):
self.semantic_stack.append("void")
def param_added(self, current_token: Token):
func = self.semantic_stack[-3]
is_array = current_token.lexeme == "]"
param_name = None
for i in self.symbol_table.get_rows():
if i.address == self.semantic_stack[-1]:
param_name = i.lexeme
break
self.function_table.add_param(
func,
param_name,
self.semantic_stack[-2],
self.semantic_stack[-1],
is_array,
)
self.semantic_stack.pop()
self.semantic_stack.pop()
def pop(self, current_token: Token):
self.semantic_stack.pop()
def assign_to_func(self, current_token: Token):
if not self.main_added:
self.add_three_address_code(
f"(ASSIGN, {self.semantic_stack.pop()}, {self.current_function_address}, )"
)
def set_array_address(self, current_token: Token):
temp = self.symbol_table.get_temp()
offset = self.semantic_stack.pop()
base = self.semantic_stack.pop()
self.add_three_address_code(f"(MULT, #4, {offset}, {temp})")
if self.func_arg_is_array(base):
self.add_three_address_code(f"(ADD, {base}, {temp}, {temp})")
else:
self.add_three_address_code(f"(ADD, #{base}, {temp}, {temp})")
self.semantic_stack.append(f"@{temp}")
def func_call_started(self, current_token: Token):
func_name = self.semantic_stack[-1]
self.arg_counter = 0
self.func_call_stack.append(func_name)
def func_call_ended(self, current_token: Token):
function_address = self.func_call_stack.pop()
temp = self.symbol_table.get_temp()
self.add_three_address_code(f"(ASSIGN, #0, {function_address}, )")
self.add_three_address_code(f"(ASSIGN, #0, {temp}, )")
self.add_three_address_code(f"(ASSIGN, {self.retrun_temp}, {temp}, )")
self.add_three_address_code(f"(ASSIGN, #{self.i + 2}, {self.retrun_temp}, )")
self.add_three_address_code(
f"(JP, {self.function_table.funcs[function_address]['start_address']}, , )"
)
self.add_three_address_code(f"(ASSIGN, {temp}, {self.retrun_temp}, )")
self.arg_counter = 0
function_temp = self.symbol_table.get_temp()
self.add_three_address_code(
f"(ASSIGN, {self.semantic_stack.pop()}, {function_temp}, )"
)
self.semantic_stack.append(function_temp)
def push_arg(self, current_token: Token):
function_info = self.function_table.funcs[self.func_call_stack[-1]]
try:
self.semantic_stack.append(
function_info["params_address"][self.arg_counter]
)
self.arg_counter += 1
except IndexError:
self.semantic_stack.append("#20") # TODO change this temp
function_name = function_info["name"].lexeme
self.add_error(
f"Semantic Error! Mismatch in numbers of arguments of '{function_name}'."
)
def end_function(self, current_token: Token):
function_address = self.semantic_stack.pop()
function_type = self.semantic_stack.pop()
# maybe we should do something here
def set_func_start(self, current_token: Token):
self.is_inside_function_declaration = False
self.function_table.funcs[self.semantic_stack[-1]]["start_address"] = self.i
def new_scope(self, current_token: Token):
self.symbol_table.increase_scope_stack()
def end_scope(self, current_token: Token):
self.symbol_table.decrease_scope_stack()
def _return(self, current_token: Token):
function_name = self.symbol_table.reverse_address(self.current_function_address)
if function_name.lexeme != "main":
self.add_three_address_code(f"(JP, @{self.retrun_temp}, , )")
def assign_arg(self, current_token: Token):
src = self.semantic_stack.pop()
dst = self.semantic_stack.pop()
function_info = self.function_table.funcs[self.func_call_stack[-1]]
current_arg_is_array = function_info["params_array"][self.arg_counter - 1]
self.check_missmatch_type(src, function_info)
if current_arg_is_array and self.is_in_main():
self.add_three_address_code(f"(ASSIGN, #{src}, {dst}, )")
else:
self.add_three_address_code(f"(ASSIGN, {src}, {dst}, )")
def break_temp(self, current_token: Token):
break_temp = self.symbol_table.get_temp()
self.semantic_stack.append(break_temp)
self.semantic_stack.append(self.i)
self.i += 1 # leave empty for further break fill
# self.break_bool = True
def break_jump(self, current_token: Token):
try:
self.add_three_address_code(f"(JP, @{self.semantic_stack[-5]}, , )")
except IndexError:
self.add_error("Semantic Error! No 'repeat ... until' found for 'break'.")
def set_break_temp(self, current_token: Token):
index = self.semantic_stack.pop()
self.add_three_address_code(
f"(ASSIGN, #{self.i}, {self.semantic_stack.pop()}, )",
index=index,
increase_i=False,
)
# semantic errors
def check_missmatch_type(self, src, function_info):
current_arg_is_array = function_info["params_array"][self.arg_counter - 1]
var = self.symbol_table.reverse_address(src)
var_type = "int" if var == None else var.type.name
arg_type = (
function_info["params_type"][self.arg_counter - 1]
if function_info["params_array"][self.arg_counter - 1] == False
else "array"
)
function_name = function_info["name"].lexeme
if current_arg_is_array and var_type != SymbolTableRowType.array.name:
self.add_error(
f"Semantic Error! Mismatch in type of argument {self.arg_counter} of '{function_name}'. Expected 'array' but got '{var_type}' instead."
)
elif arg_type != var_type:
self.add_error(
f"Semantic Error! Mismatch in type of argument {self.arg_counter} of '{function_name}'. Expected '{arg_type}' but got '{var_type}' instead."
)
def check_operand_missmatch(self, first, second):
if "@" in str(first) or "@" in str(second):
return
first_row = self.symbol_table.reverse_address(first)
first_row = first_row.type.name if first_row else "int"
second_row = self.symbol_table.reverse_address(second)
second_row = second_row.type.name if second_row else "int"
if first_row != second_row:
self.add_error(
f"Semantic Error! Type mismatch in operands, Got {second_row} instead of {first_row}."
)
def check_not_void(self, row: SymbolTableRow):
if row.type == SymbolTableRowType.void and row.func_or_var == FuncOrVar.var:
self.add_error(f"Semantic Error! Illegal type of void for '{row.lexeme}'.")
def pdeclare(self, current_token: Token):
var_type = self.semantic_stack[-2]
var_row = self.symbol_table.reverse_address(self.semantic_stack[-1])
if var_row.type != SymbolTableRowType.array:
var_row.type = (
SymbolTableRowType.int
if var_type == SymbolTableRowType.int.name
else SymbolTableRowType.void
)
var_row.is_declred = True
self.check_not_void(var_row)
def make_var_array(self, current_token: Token):
var_row = self.symbol_table.reverse_address(self.semantic_stack[-2])
var_row.type = SymbolTableRowType.array
def array_param_added(self, current_token: Token):
var_row = self.symbol_table.reverse_address(self.semantic_stack[-1])
var_row.type = SymbolTableRowType.array
self.param_added(current_token)
def check_declare(self, current_token: Token):
address = self.semantic_stack[-1]
row = self.symbol_table.reverse_address(address)
if not row or not row.is_declred:
self.add_error(f"Semantic Error! '{current_token.lexeme}' is not defined.")
if row:
row.type = SymbolTableRowType.int