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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.

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/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2022 Guardsquare NV
 *
 * 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.
 */

package proguard.analysis.cpa.bam;

import proguard.analysis.datastructure.callgraph.Call;
import proguard.classfile.Signature;
import proguard.analysis.cpa.interfaces.AbstractState;
import proguard.analysis.cpa.interfaces.CfaEdge;
import proguard.analysis.cpa.interfaces.CfaNode;

/**
 * This operator is used to recover the information discarded when entering a procedure block depending on the domain-specific analysis.
 *
 * @author Carlo Alberto Pozzoli
 */
public interface ExpandOperator, CfaEdgeT extends CfaEdge, SignatureT extends Signature>
{

    /**
     * Reconstructs the state of the caller of a procedure using the information of the expanded initial state, the reduced exit state, the block entry node (that can be used to retrieve the CFA
     * subgraph of the function), and the call to the procedure.
     *
     * @param expandedInitialState the entry state of the called procedure before any reduction
     * @param reducedExitState     the state of the called procedure in its exit node
     * @param blockEntryNode       the entry node of the called procedure
     * @param call                 the information of the call to the procedure
     * @return The state of the caller after the procedure call, eventually with some collisions of identifiers that need the {@link RebuildOperator} to be solved
     */
    AbstractState expand(AbstractState expandedInitialState, AbstractState reducedExitState, CfaNodeT blockEntryNode, Call call);
}