removeParameters.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 FRONTENDS_P4_REMOVEPARAMETERS_H_
#define FRONTENDS_P4_REMOVEPARAMETERS_H_
 
#include "frontends/common/resolveReferences/resolveReferences.h"
#include "frontends/p4/typeChecking/typeChecker.h"
#include "frontends/p4/typeMap.h"
#include "ir/ir.h"
 
namespace P4 {

class ActionInvocation {
    std::map<const IR::P4Action *, const IR::MethodCallExpression *> invocations;
    std::set<const IR::P4Action *> all;  // for these actions remove all parameters
    std::set<const IR::MethodCallExpression *> calls;
    std::map<const IR::MethodCallExpression *, unsigned> defaultActions;
 
 public:
    void bind(const IR::P4Action *action, const IR::MethodCallExpression *invocation,
              bool allParams) {
        CHECK_NULL(action);
        BUG_CHECK(invocations.find(action) == invocations.end(), "%1%: action called twice",
                  action);
        invocations.emplace(action, invocation);
        if (allParams) all.emplace(action);
        calls.emplace(invocation);
    }
    void bindDefaultAction(const IR::P4Action *action,
                           const IR::MethodCallExpression *defaultInvocation) {
        // We must have a binding for this action already.
        auto actionCallInvocation = ::P4::get(invocations, action);
        CHECK_NULL(actionCallInvocation);
        // We must remove all arguments which are bound in the action list.
        unsigned boundArgs = actionCallInvocation->arguments->size();
        defaultActions.emplace(defaultInvocation, boundArgs);
    }
    const IR::MethodCallExpression *get(const IR::P4Action *action) const {
        return ::P4::get(invocations, action);
    }
    bool removeAllParameters(const IR::P4Action *action) const {
        return all.find(action) != all.end();
    }
    bool isCall(const IR::MethodCallExpression *expression) const {
        return calls.find(expression) != calls.end();
    }
    unsigned argsToRemove(const IR::MethodCallExpression *defaultCall) const {
        if (defaultActions.find(defaultCall) == defaultActions.end()) return 0;
        return ::P4::get(defaultActions, defaultCall);
    }
};
 
class FindActionParameters : public Inspector, public ResolutionContext {
    TypeMap *typeMap;
    ActionInvocation *invocations;
 
 public:
    FindActionParameters(TypeMap *typeMap, ActionInvocation *invocations)
        : typeMap(typeMap), invocations(invocations) {
        CHECK_NULL(invocations);
        CHECK_NULL(typeMap);
        setName("FindActionParameters");
    }
 
    void postorder(const IR::ActionListElement *element) override;
    void postorder(const IR::MethodCallExpression *expression) override;
};

class DoRemoveActionParameters : public Transform {
    ActionInvocation *invocations;
    TypeMap *typeMap;
    MinimalNameGenerator *nameGen;
 
 public:
    DoRemoveActionParameters(ActionInvocation *invocations, TypeMap *typeMap,
                             MinimalNameGenerator *nameGen)
        : invocations(invocations), typeMap(typeMap), nameGen(nameGen) {
        CHECK_NULL(invocations);
        CHECK_NULL(typeMap);
        CHECK_NULL(nameGen);
        setName("DoRemoveActionParameters");
    }
 
    const IR::Node *postorder(IR::P4Action *table) override;
    const IR::Node *postorder(IR::ActionListElement *element) override;
    const IR::Node *postorder(IR::MethodCallExpression *expression) override;
    ActionInvocation *getInvocations() { return invocations; }
};
 
class RemoveActionParameters : public PassManager {
 public:
    explicit RemoveActionParameters(TypeMap *typeMap, TypeChecking *typeChecking = nullptr);
};
 
}  // namespace P4
 
#endif /* FRONTENDS_P4_REMOVEPARAMETERS_H_ */