enumInstance.h

/*
Copyright 2013-present Barefoot Networks, Inc.
 
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
 
    http://www.apache.org/licenses/LICENSE-2.0
 
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
 
#ifndef FRONTENDS_P4_ENUMINSTANCE_H_
#define FRONTENDS_P4_ENUMINSTANCE_H_
 
#include "frontends/p4/typeMap.h"
#include "ir/ir.h"
#include "methodInstance.h"
 
namespace P4 {
 
// helps resolving references to compile-time enum fields, e.g., X.a
class EnumInstance : public InstanceBase {
 protected:
    EnumInstance(const IR::ID name, const IR::Type *type, const P4::TypeMap *typeMap)
        : name(name), type(type), typeMap(typeMap) {}
 
 public:
    const IR::ID name;
    const IR::Type *type;
    const P4::TypeMap *typeMap;
 
    static EnumInstance *resolve(const IR::Expression *expression, const P4::TypeMap *typeMap);
    bool equals(const EnumInstance *other) const {
        return typeMap->equivalent(type, other->type) && name.name == other->name.name;
    }
 
    DECLARE_TYPEINFO(EnumInstance, InstanceBase);
};
 
class SimpleEnumInstance : public EnumInstance {
 public:
    SimpleEnumInstance(const IR::Type_Enum *type, const IR::ID name, const P4::TypeMap *typeMap)
        : EnumInstance(name, type, typeMap) {}
 
    DECLARE_TYPEINFO(SimpleEnumInstance, EnumInstance);
};
 
class SerEnumInstance : public EnumInstance {
 public:
    const IR::Expression *value;
    SerEnumInstance(const IR::Type_SerEnum *type, const IR::ID name, const IR::Expression *value,
                    const P4::TypeMap *typeMap)
        : EnumInstance(name, type, typeMap), value(value) {}
 
    DECLARE_TYPEINFO(SerEnumInstance, EnumInstance);
};
 
}  // namespace P4
 
#endif /* FRONTENDS_P4_ENUMINSTANCE_H_ */