def visit(self, node, variables : Variables):
self.code.append(PushIL())
p = variables.add_var(node.name.value)
if node.expr != None:
self.visit(node.expr, variables)
r = variables.peek_last()
self.code.append(VarToVarIL(variables.id(p), variables.id(r) ))
variables.pop_var()
self.code.append(PopIL(1))
def unary_op(self, node, variables : Variables , symb : str):
self.code.append(CommentIL('Unary_op'))
res = variables.add_temp()
self.code.append(PushIL())
self.visit(node.expr, variables)
l = variables.peek_last()
self.code.append(UnaryOpIL(variables.id(res), variables.id(l), symb))
variables.pop_var()
self.code.append(PopIL(1))
def bin_op(self, node, variables : Variables, sym : str):
self.code.append(CommentIL('Binary_op'))
self.code.append(PushIL(0))
res = variables.add_temp()
self.visit(node.left, variables)
l = variables.peek_last()
self.visit(node.right, variables)
r = variables.peek_last()
self.code.append(BinOpIL(variables.id(res), variables.id(l), variables.id(r), sym))
variables.pop_var()
variables.pop_var()
self.code.append(PopIL(2))
def visit(self, node, variables):
node.branches.sort(key = lambda x : self.depth[x.type], reverse = True)
res = variables.add_temp()
self.code.append(PushIL())
self.visit(node.main_expr, variables)
m = variables.peek_last()
b_labels = [LabelIL('branch', self.getInt()) for _ in node.branches]
i = 0
for b in node.branches:
temp = variables.add_temp()
self.code.append(PushIL())
self.code.append(InheritIL(variables.id(m), b.type, variables.id(temp)))
self.code.append(IfJumpIL(variables.id(temp),b_labels[i].label))
self.code.append(PopIL(1))
variables.pop_var()
i += 1
end = LabelIL('end_case', self.get_Int())
i = 0
for b in node.branches:
self.code.append(b_labels[i])
i += 1
Variables.pop_var()
self.code.append(PopIL(1))
self.code.append(PushIL())
r = variables.add_var(b.id)
self.code.append(VarToVarIL(variables.id(r), variables.id(m)))
self.visit(b.expr, variables)
p = variables.peek_last()
self.code.append(VarToVarIL(variables.id(res), variables.id(p)))
for _ in range(3):
variables.pop_var()
self.code.append(PopIL(3))
def create_constructor(self, attrs):
self.code.append(LabelIL(self.cur_class, 'Constructor', True))
variables = Variables()
variables.add_var('self')
variables.add_temp() # return address
for node in attrs:
if node.value == None:
continue
self.visit(node.value, variables)
p = variables.peek_last()
idx = self.vt.get_attr_id(self.cur_class, node.name.value)
self.code.append(VarToMemoIL(variables.id('self'), variables.id(p), idx))
variables.pop_var()
self.code.append(PopIL(1))
self.code.append(PushIL()) #No result, but needed in logic
self.code.append(ReturnIL())