Beispiel #1
0
def cgen_new_array(node):
    emit_comment('cgen_new_array')
    stack_handler.add_checkpoint()
    len_expr = cgen_expr(node.ref_child[1])
    (member_type, dimension) = expr_type(node.ref_child[2])

    if len_expr.get_type() != Type.int:
        raise TypeError("in node: \n" + node.__repr__() +
                        "\n length of new_array isn't int.")

    len_expr_address = len_expr.get_address()
    len_expr_address.load()

    emit_li('$t0', '4')

    emit_addi('$s0', '$s0', '1')
    emit('mult $s0, $t0')
    emit('mflo $a0')
    emit_li('$v0', 9)
    emit_syscall()

    # Set length
    emit_addi('$s0', '$s0', '-1')
    emit('sw $s0, 0($v0)')
    emit_addi('$s0', '$s0', '1')

    emit_move('$s0', '$v0')

    stack_handler.back_to_last_checkpoint()
    expr_set_node_attributes(node, Type.array)
    node.get_address().store()
    node.set_array_dim(dimension + 1)
    node.set_array_member_type(member_type)
    return node
Beispiel #2
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def expr_add_sub(node, operation):
    # operation = 'add' or 'sub'
    stack_handler.add_checkpoint()
    left_child = cgen_expr(node.ref_child[0])
    right_child = cgen_expr(node.ref_child[2])
    left_child_type = left_child.get_type()

    left_child_address = left_child.get_address()
    right_child_address = right_child.get_address()

    if left_child_type != right_child.get_type() or left_child_type not in (
            Type.double, Type.int):
        raise TypeError("in node: \n" + node.__repr__() +
                        "\n exprs' types are not good for " + operation +
                        " operation.")
    elif left_child_type == Type.int:
        left_child_address.load()
        emit("move $s1, $s0")
        right_child_address.load()
        emit(operation + " $s0, $s1, $s0")
    elif left_child_type == Type.double:
        left_child_address.load()
        emit("mov.s $f2, $f0")
        right_child_address.load()
        emit(operation + ".s $f0, $f2, $f0")

    stack_handler.back_to_last_checkpoint()
    expr_set_node_attributes(node, left_child_type)
    node.get_address().store()
    return node
Beispiel #3
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def cgen_expr_le(node):
    emit_comment('cgen_expr_le')
    stack_handler.add_checkpoint()

    left_child = cgen_expr(node.ref_child[0])
    right_child = cgen_expr(node.ref_child[2])

    left_child_address = left_child.get_address()
    right_child_address = right_child.get_address()

    if left_child.get_type() != right_child.get_type():
        raise TypeError("in node: \n" + node.__repr__() +
                        "\nTwo exprs must have same type.")
    elif left_child.get_type() == Type.double:
        expr_float_cmp(left_child_address, right_child_address, 'lt')
    elif left_child.get_type() == Type.int:
        left_child_address.load()
        emit_move("$s1", "$s0")
        right_child_address.load()
        emit("slt $s0, $s1, $s0")
    else:
        raise TypeError("in node: \n" + node.__repr__() +
                        "\nExprs' type isn't comparable.")

    stack_handler.back_to_last_checkpoint()
    expr_set_node_attributes(node, Type.bool)
    node.get_address().store()
    return node
Beispiel #4
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def expr_or_and(node, operation):
    # operation = 'and' or 'or'
    stack_handler.add_checkpoint()

    left_child = cgen_expr(node.ref_child[0])
    right_child = cgen_expr(node.ref_child[2])

    if left_child.get_type() != Type.bool or right_child.get_type(
    ) != Type.bool:
        raise TypeError("in node: \n" + node.__repr__() +
                        "\n one of exprs' type is not bool.")

    left_child_address = left_child.get_address()
    right_child_address = right_child.get_address()

    left_child_address.load()
    emit("move $s1, $s0")
    right_child_address.load()
    emit(operation + " $s0, $s0, $s1")

    stack_handler.back_to_last_checkpoint()
    expr_set_node_attributes(node, Type.bool)
    node.get_address().store()

    return node
Beispiel #5
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def cgen_expr_equal(node):
    emit_comment('cgen_expr_equal')
    stack_handler.add_checkpoint()

    left_child = cgen_expr(node.ref_child[0])
    right_child = cgen_expr(node.ref_child[2])

    left_child_address = left_child.get_address()
    right_child_address = right_child.get_address()

    if not expr_convertable(left_child.get_type(),
                            right_child.get_type()) and not expr_convertable(
                                right_child.get_type(), left_child.get_type()):
        emit_li("$s0", 0)
    elif left_child.get_type() == Type.double:
        expr_float_cmp(left_child_address, right_child_address, 'eq')
    elif left_child.get_type() == Type.string:
        left_child_address.load()
        emit_move('$s1', '$s0')
        right_child_address.load()
        emit_move('$s2', '$s0')
        emit_li('$s0', 1)

        first_label = create_label()
        second_label = create_label()
        out_label = create_label()

        emit_label(first_label)
        emit_load_byte('$t0', '$s1')
        emit_load_byte('$t1', '$s2')
        emit_addi('$s1', '$s1', '1')
        emit_addi('$s2', '$s2', '1')
        emit('beq $t0, $t1, ' + second_label)
        emit_li('$s0', 0)
        emit_label(second_label)
        emit('beqz $t0, ' + out_label)
        emit('beqz $t1, ' + out_label)
        emit_jump(first_label)
        emit_label(out_label)

    else:
        left_child_address.load()
        emit_move('$s1', '$s0')
        right_child_address.load()
        emit("xor $t0, $s0, $s1")

        emit("slt $t1, $t0, $zero")
        emit("slt $t0, $zero, $t0")
        emit("or $t0, $t0, $t1")

        emit("li $t1, 1")
        emit("sub $s0, $t1, $t0")
        emit("")

    stack_handler.back_to_last_checkpoint()

    expr_set_node_attributes(node, Type.bool)
    node.get_address().store()
    return node
Beispiel #6
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def cgen_expr_leq(node):
    emit_comment('cgen_expr_leq')
    stack_handler.add_checkpoint()
    node = cgen_expr_le(node)
    node.get_address().load()
    emit_move("$s2", "$s0")

    stack_handler.back_to_last_checkpoint()

    node = cgen_expr_equal(node)
    node.get_address().load()
    emit("or $s0, $s0, $s2")
    node.get_address().store()
    return node
Beispiel #7
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def cgen_expr_not(node):
    emit_comment('cgen_expr_not')
    stack_handler.add_checkpoint()

    child = cgen_expr(node.ref_child[1])

    if child.get_type() != Type.bool:
        raise TypeError("in node: \n" + node.__repr__() +
                        "\n expr's type is not bool.")

    child_address = child.get_address()
    child_address.load()

    emit("li $t0, 1")
    emit("sub $s0, $t0, $s0")

    stack_handler.back_to_last_checkpoint()
    expr_set_node_attributes(node, Type.bool)
    node.get_address().store()
    return node
Beispiel #8
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def cgen_expr_assign(node):
    emit_comment('cgen_expr_assign')
    stack_handler.add_checkpoint()
    lvalue = cgen_lvalue(node.ref_child[0])
    rvalue_expr = cgen_expr(node.ref_child[2])

    rvalue_expr_type = rvalue_expr.get_type()
    lvalue_type = lvalue.get_type()

    if not expr_convertable(lvalue_type, rvalue_expr_type):
        raise TypeError("in node: \n" + lvalue.__repr__() +
                        rvalue_expr.__repr__() +
                        "\nrvalue and lvalue type must be equal.")

    if rvalue_expr_type == Type.array:
        if (not expr_convertable(lvalue.get_array_member_type(),
                                 rvalue_expr.get_array_member_type())) or \
                rvalue_expr.get_array_dim() != lvalue.get_array_dim():
            raise TypeError("in node: \n" + lvalue.__repr__() +
                            rvalue_expr.__repr__() +
                            "\nrvalue and lvalue member-type and "
                            "arr-dimension must be equal.")

    lvalue_address = lvalue.get_address()
    rvalue_address = rvalue_expr.get_address()

    rvalue_address.load()
    emit_move('$t0', '$s0')

    lvalue_address.store()

    emit_move('$s0', '$t0')
    stack_handler.back_to_last_checkpoint()
    expr_set_node_attributes(node, lvalue_type)
    node.get_address().store()

    if rvalue_expr_type == Type.array:
        node.set_array_dim(lvalue.get_array_dim())
        node.set_array_member_type(lvalue.get_array_member_type())

    return node
Beispiel #9
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def cgen_expr_neg(node):
    emit_comment('cgen_expr_neg')
    stack_handler.add_checkpoint()

    child = cgen_expr(node.ref_child[1])
    child_type = child.get_type()
    child_address = child.get_address()
    child_address.load()

    if child_type == Type.int:
        emit("sub $s0, $zero, $s0")
    elif child_type == Type.double:
        emit("neg.s $f0, $f0")
    else:
        raise TypeError("in node: \n" + node.__repr__() +
                        "\n expr's type is not int or double.")

    stack_handler.back_to_last_checkpoint()
    expr_set_node_attributes(node, child_type)
    node.get_address().store()
    return node
Beispiel #10
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def cgen_lvalue(node):
    emit_comment('cgen_lvalue')
    left_child = node.ref_child[0]
    right_child = None
    if len(node.ref_child) >= 3:
        right_child = node.ref_child[2]

    if left_child.data == 'ident':
        ident_name = expr_ident(left_child)
        variable = ut.symbolTable.get_variable_by_name(ident_name)
        if variable.is_array:
            node.set_type(Type.array)
            node.set_array_member_type(variable.type[0])
            node.set_array_dim(variable.type[1])
        else:
            node.set_type(variable.type)

        node.set_address(variable.address)
    elif right_child.data == 'ident':
        stack_handler.add_checkpoint()
        expr = cgen_expr(left_child)
        ident_name = expr_ident(right_child)

        variable = ut.class_handler.get_variable(expr.get_type(), ident_name)

        expr.get_address().load()

        stack_handler.back_to_last_checkpoint()
        new_address = new_address_on_top_of_stack(False)
        new_address.store()

        if variable.is_array:
            node.set_type(Type.array)
            node.set_array_member_type(variable.type[0])
            node.set_array_dim(variable.type[1])
        else:
            node.set_type(variable.type)

        node.set_address(
            Address((new_address, variable.address), 2,
                    node.get_type() == Type.double))
    else:
        left_expr = cgen_expr(left_child)
        stack_handler.add_checkpoint()

        right_expr = cgen_expr(right_child)

        if left_expr.get_type() != Type.array:
            raise TypeError("in node: \n" + node.__repr__() +
                            "\nleft-expr isn't an array.")
        if right_expr.get_type() != Type.int:
            raise TypeError("in node: \n" + node.__repr__() +
                            "\nright-expr isn't an integer.")

        node.set_type(Type.array)
        array_member_type = left_expr.get_array_member_type()
        dimension = left_expr.get_array_dim() - 1
        if dimension > 0:
            node.set_array_dim(dimension)
            node.set_array_member_type(array_member_type)
        else:
            node.set_type(array_member_type)

        right_expr.get_address().load()
        stack_handler.back_to_last_checkpoint()
        new_address = new_address_on_top_of_stack(False)
        new_address.store()

        node.set_address(
            Address((left_expr.get_address(), new_address), 3,
                    array_member_type == Type.double and dimension == 0))

    return node
Beispiel #11
0
def cgen_call(node):
    emit_comment('cgen_call()')
    left_child = node.ref_child[0]

    stack_handler.add_checkpoint()

    if left_child.data == 'expr':
        expr = cgen_expr(node.ref_child[0])
        function_name = expr_ident(node.ref_child[2])
        actual_node = node.ref_child[3]

        if not is_class_type(
                expr.get_type()) and expr.get_type() != Type.array:
            raise TypeError("in node: \n" + node.__repr__() +
                            "\nexpr's type isn't class or array type.")

        if expr.get_type == Type.array and function_name != 'length':
            raise TypeError(
                "in node: \n" + node.__repr__() +
                "\nwhen expr is array function_name must be length")

        argument_list = expr_atual_get_args_list(actual_node, [expr])

        argument_type_list = get_args_type_list(argument_list)

        push_arguments_to_stack(argument_list)

        ra_address = push_ra_to_stack()

        if expr.get_type() == Type.array:
            emit_load_address('$s0', '___array_length')
            return_type = Type.int
        else:
            function, function_address = get_class_function_and_its_address(
                expr.get_address(), function_name, expr.get_type(),
                argument_type_list[1:])
            function_address.load()
            return_type = function.return_type

    else:
        function_name = expr_ident(left_child)
        actual_node = node.ref_child[1]

        argument_list = expr_atual_get_args_list(actual_node, [])

        argument_type_list = get_args_type_list(argument_list)

        if ut.this_type is None:
            function = function_handler.get_function(function_name,
                                                     argument_type_list)
            function_address = None
            push_arguments_to_stack(argument_list)
        else:
            try:
                function, function_address = get_class_function_and_its_address(
                    get_this_address(), function_name, ut.this_type,
                    argument_type_list)
                push_arguments_to_stack(argument_list)
                get_this_address().load()
                new_address_on_top_of_stack(
                    ut.this_type == Type.double).store()
            except FunctionError:
                function = function_handler.get_function(
                    function_name, argument_type_list)
                function_address = None
                push_arguments_to_stack(argument_list)

        return_type = function.return_type

        ra_address = push_ra_to_stack()
        if function_address is None:
            emit_load_address('$s0', function.label)
        else:
            function_address.load()

    stack_handler.set_fp_equal_sp()

    emit_jalr('$s0')

    stack_handler.back_to_last_fp()

    ra_address.load()
    emit_move('$ra', '$s0')
    emit_move('$s0', '$v0')
    stack_handler.back_to_last_checkpoint()

    if isinstance(return_type, str):
        expr_set_node_attributes(node, return_type)
    else:
        expr_set_node_attributes(node, Type.array)
        node.set_array_member_type(return_type[0])
        node.set_array_dim(return_type[1])

    node.get_address().store()
    return node