get_pointer_type
right_type = get_pointer_type(expr->right);
left_type = get_pointer_type(expr->left);
return get_pointer_type(expr);
type = get_pointer_type(expr->left);
type = get_pointer_type(expr->left);
type = get_pointer_type(arg_expr);
struct symbol *get_pointer_type(struct expression *expr);
ret = get_pointer_type(expr->unop);