convertErrors.h

/* Copyright 2021 Intel Corporation
 
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 MIDEND_CONVERTERRORS_H_
#define MIDEND_CONVERTERRORS_H_
 
#include <map>
 
#include "frontends/p4/typeChecking/typeChecker.h"
#include "frontends/p4/typeMap.h"
#include "ir/ir.h"
#include "ir/node.h"
#include "ir/pass_manager.h"
#include "ir/visitor.h"
#include "lib/cstring.h"
#include "lib/null.h"
#include "lib/safe_vector.h"
#include "midend/convertEnums.h"
 
namespace P4 {
 
class ChooseErrorRepresentation {
 public:
    virtual ~ChooseErrorRepresentation() = default;
 
    virtual bool convert(const IR::Type_Error *type) const = 0;
 
    virtual unsigned errorSize(unsigned errorCount) const = 0;
 
    virtual IR::IndexedVector<IR::SerEnumMember> *assignValues(IR::Type_Error *type,
                                                               unsigned width) const;
};
 
class DoConvertErrors : public Transform {
    friend class ConvertErrors;
 
    std::map<cstring, P4::EnumRepresentation *> repr;
    ChooseErrorRepresentation *policy;
    P4::TypeMap *typeMap;
 
 public:
    DoConvertErrors(ChooseErrorRepresentation *policy, P4::TypeMap *typeMap)
        : policy(policy), typeMap(typeMap) {
        CHECK_NULL(policy);
        CHECK_NULL(typeMap);
        setName("DoConvertErrors");
    }
    const IR::Node *preorder(IR::Type_Error *type) override;
    const IR::Node *postorder(IR::Type_Name *type) override;
    const IR::Node *postorder(IR::Member *member) override;
};
 
class ConvertErrors : public PassManager {
    DoConvertErrors *convertErrors{nullptr};
 
 public:
    using ErrorMapping = decltype(DoConvertErrors::repr);
    ConvertErrors(P4::TypeMap *typeMap, ChooseErrorRepresentation *policy,
                  P4::TypeChecking *typeChecking = nullptr)
        : convertErrors(new DoConvertErrors(policy, typeMap)) {
        if (typeChecking == nullptr) {
            typeChecking = new P4::TypeChecking(nullptr, typeMap);
        }
        passes.push_back(typeChecking);
        passes.push_back(convertErrors);
        passes.push_back(new P4::ClearTypeMap(typeMap));
        setName("ConvertErrors");
    }
 
    ErrorMapping getErrorMapping() const { return convertErrors->repr; }
};
}  // namespace P4
 
#endif /* MIDEND_CONVERTERRORS_H_ */