copyStructures.h

/*
Copyright 2016 VMware, 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 MIDEND_COPYSTRUCTURES_H_
#define MIDEND_COPYSTRUCTURES_H_
 
#include "frontends/p4/typeChecking/typeChecker.h"
#include "ir/ir.h"
 
namespace P4 {

class DoCopyStructures : public Transform {
    TypeMap *typeMap;
    bool errorOnMethodCall;

    bool copyHeaders;
    bool copyTuples;
 
 public:
    explicit DoCopyStructures(TypeMap *typeMap, bool errorOnMethodCall, bool copyHeaders = false,
                              bool copyTuples = true)
        : typeMap(typeMap),
          errorOnMethodCall(errorOnMethodCall),
          copyHeaders(copyHeaders),
          copyTuples(copyTuples) {
        CHECK_NULL(typeMap);
        setName("DoCopyStructures");
    }
    // FIXME -- this should be a preorder so we can deal with nested structs directly,
    // but that fails because we depend on the typeMap which will be out of date after
    // expanding outer copies.  So we need to repeat this pass in a loop
    const IR::Node *postorder(IR::AssignmentStatement *statement) override;
};

class RemoveAliases : public Transform {
    MinimalNameGenerator nameGen;
    TypeMap *typeMap;
 
    IR::IndexedVector<IR::Declaration> declarations;
 
 public:
    explicit RemoveAliases(TypeMap *typeMap) : typeMap(typeMap) {
        CHECK_NULL(typeMap);
        setName("RemoveAliases");
    }
    Visitor::profile_t init_apply(const IR::Node *node) override {
        auto rv = Transform::init_apply(node);
        node->apply(nameGen);
 
        return rv;
    }
 
    const IR::Node *postorder(IR::AssignmentStatement *statement) override;
    const IR::Node *postorder(IR::P4Parser *parser) override;
    const IR::Node *postorder(IR::P4Control *control) override;
};
 
class CopyStructures : public PassRepeated {
 public:
    explicit CopyStructures(TypeMap *typeMap, bool errorOnMethodCall = true,
                            bool copyHeaders = false, bool copyTuples = false,
                            TypeChecking *typeChecking = nullptr) {
        CHECK_NULL(typeMap);
        setName("CopyStructures");
        if (typeChecking == nullptr) typeChecking = new TypeChecking(nullptr, typeMap);
        addPasses({typeChecking, new RemoveAliases(typeMap), typeChecking,
                   new DoCopyStructures(typeMap, errorOnMethodCall, copyHeaders, copyTuples)});
    }
};
 
}  // namespace P4
 
#endif /* MIDEND_COPYSTRUCTURES_H_ */