def _exp_eq(code: Code, exp):
left = exp['left']
right = exp['right']
left_type = exp['left']['type']
_expression(code, left)
_expression(code, right)
if isinstance(left_type, TypeInt) or isinstance(
left_type, TypeBool) or isinstance(left_type, TypeReal):
if isinstance(left_type, TypeReal):
code.cmp_double_l()
cmp_pos = code.pos()
code.if_eq()
else:
cmp_pos = code.pos()
code.if_cmp_int_eq()
code.const_int(0)
goto_pos = code.pos()
code.goto()
true_pos = code.pos()
code.const_int(1)
end_pos = code.pos()
code.update_jump(cmp_pos, true_pos)
code.update_jump(goto_pos, end_pos)
elif isinstance(left_type, TypeStr):
code.invoke_virtual(*JM_STRING_EQUALS)
else:
raise NotImplementedError()
def _exp_plus(code: Code, exp):
left = exp['left']
right = exp['right']
left_type = exp['left']['type']
_expression(code, left)
_expression(code, right)
if isinstance(left_type, TypeInt):
code.add_int()
elif isinstance(left_type, TypeReal):
code.add_double()
elif isinstance(left_type, TypeStr):
code.invoke_virtual(*JM_STRING_CONCAT)
else:
raise NotImplementedError()
def _exp_function_call(code: Code, exp):
name = exp['name']
args_exps = exp['arguments']
params = exp['parameters']
ret = exp['type']
for e in args_exps:
_expression(code, e)
# check for predefined functions
if name == FN_LEN and len(params) == 1:
if isinstance(params[0], TypeStr):
code.invoke_virtual(*JM_STRING_LENGTH)
return
elif isinstance(params[0], TypeArray):
code.array_length()
return
if name == FN_INT and len(params) == 1:
if isinstance(params[0], TypeInt):
# nothing to do
return
elif isinstance(params[0], TypeReal):
code.double_to_int()
return
elif isinstance(params[0], TypeBool):
# nothing to do
return
elif isinstance(params[0], TypeStr):
code.invoke_static(*JSM_INT_PARSE)
return
if name == FN_REAL and len(params) == 1:
if isinstance(params[0], TypeInt):
code.int_to_double()
return
elif isinstance(params[0], TypeReal):
# nothing to do
return
elif isinstance(params[0], TypeBool):
code.int_to_double()
return
elif isinstance(params[0], TypeStr):
code.invoke_static(*JSM_DOUBLE_PARSE)
return
if name == FN_BOOL and len(params) == 1:
if isinstance(params[0], TypeInt):
code.const_int(1)
code.and_int()
return
elif isinstance(params[0], TypeReal):
code.const_double(0.0)
code.cmp_double_l()
cmp_pos = code.pos()
code.if_eq()
code.const_int(1)
goto_pos = code.pos()
code.goto()
false_pos = code.pos()
code.const_int(0)
end_pos = code.pos()
code.update_jump(cmp_pos, false_pos)
code.update_jump(goto_pos, end_pos)
return
elif isinstance(params[0], TypeBool):
# nothing to do
return
elif isinstance(params[0], TypeStr):
code.invoke_static(*JSM_BOOLEAN_PARSE)
return
if name == FN_STR and len(params) == 1:
if isinstance(params[0], TypeInt):
code.invoke_static(*JSM_INT_TO_STRING)
return
elif isinstance(params[0], TypeReal):
code.invoke_static(*JSM_DOUBLE_TO_STRING)
return
elif isinstance(params[0], TypeBool):
code.invoke_static(*JSM_BOOLEAN_TO_STRING)
return
if name == FN_SUBSTRING and len(params) == 3:
if isinstance(params[0], TypeStr) and isinstance(
params[1], TypeInt) and isinstance(params[2], TypeInt):
code.invoke_static(*JM_STRING_SUBSTRING)
return
if name == FN_WRITE and len(params) == 1:
if isinstance(params[0], TypeStr):
code.load_static_field(*JSF_STDOUT)
code.swap()
code.invoke_virtual(*JM_PRINT)
return
if name == FN_READ_LINE and len(params) == 0:
code.load_static_field(_class_name, BUFF_READER_FIELD,
ClassDesc(JC_BUFF_READER))
code.invoke_virtual(*JM_READLINE)
# if result null, set the eof field to true and load empty string
code.dup()
cmp_pos = code.pos()
code.if_non_null()
code.const_int(1)
code.store_static_field(_class_name, EOF_FIELD, BooleanDesc())
code.const_string('')
end_pos = code.pos()
code.update_jump(cmp_pos, end_pos)
return
if name == FN_EOF and len(params) == 0:
code.load_static_field(_class_name, EOF_FIELD, BooleanDesc())
return
# custom function
name = PREFIX + name
desc = _create_method_descriptor(params, ret)
code.invoke_static(_class_name, name, desc)
