def __unary(self, num):
if num == 37:
x = Not(self.cache[0], self.cache[1])
elif num == 38:
x = Unary(Token(Tag.MINUS), self.cache[1])
else:
x = self.cache[0]
self.__value_stack.append(x)
def offset(self, a):
_type = a.type
self.match("[")
i = self._bool()
self.match("]")
_type = _type.of
w = Constant(_type.width)
t1 = Arith(Token("*"), i, w)
loc = t1
while self.look.tag == "[":
self.match("[")
i = self._bool()
self.match("]")
_type = _type.of
w = Constant(_type.width)
t1 = Arith(Token("*"), i, w)
t2 = Arith(Token("+"), loc, t1)
loc = t2
return Access(a, loc, _type)
def __offset(self, a):
# 处理数组
if isinstance(a, Access):
# 多维数组
_type = a.type.of
w = Constant(_type.width)
i = self.cache[2]
t1 = Arith(Token(Tag.MULTIPLICATIONOPERATOR), i, w)
t2 = Arith(Token(Tag.ADDITIONOPERATOR), a.index, t1)
access = Access(a.array, t2, _type)
# # 判断越界（编译时无法实现）
# if self.cache[2].value >= a.type.size:
# self.__error(a.toString()+' out of range')
else:
_type = a.type.of
w = Constant(_type.width)
i = self.cache[2]
t1 = Arith(Token(Tag.MULTIPLICATIONOPERATOR), i, w)
access = Access(a, t1, _type)
# # 判断越界（编译时无法实现）
# if self.cache[2].value >= a.type.size:
# self.__error(a.toString()+' out of range')
return access
def __arith_com_2(self):
if self.__cache == '+':
return Token(Tag.ADDITIONOPERATOR)
elif self.__cache == '-':
return Token(Tag.SUBTRACTIONOPERATOR)
elif self.__cache == '*':
return Token(Tag.MULTIPLICATIONOPERATOR)
elif self.__cache == '/':
return Token(Tag.DIVISIONOPERATOR)
elif self.__cache == '!':
return Token(Tag.LOGICNOT)
elif self.__cache == '<':
return Token(Tag.LESS)
elif self.__cache == '=':
return Token(Tag.ASSIGNMENTOPERATOR)
else:
return Token(Tag.GREATER)
def __fail(self):
return Token(Tag.ERROR)
def __end(self):
return Token(Tag.END)
def __delimit(self):
res = self.delimiter.index(self.__ch)
self.__ch = self.__nextchar()
return Token(Tag(res + self.delimiter_num))