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/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2021 Guardsquare NV
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.configuration;

import proguard.classfile.constant.Constant;
import proguard.classfile.editor.CodeAttributeEditor;
import proguard.classfile.editor.InstructionSequenceReplacer;
import proguard.classfile.editor.InstructionSequencesReplacer;
import proguard.classfile.instruction.Instruction;
import proguard.classfile.instruction.visitor.InstructionVisitor;
import proguard.classfile.instruction.visitor.MultiInstructionVisitor;
import proguard.classfile.util.BranchTargetFinder;

/**
 * This InstructionSequencesReplacer appends logging instructions to all
 * instructions calling reflection methods.
 *
 * @see InstructionSequencesReplacer
 * @see ConfigurationLoggingInstructionSequenceReplacer
 *
 * @author Johan Leys
 */
public class ConfigurationLoggingInstructionSequencesReplacer
extends      MultiInstructionVisitor
implements   InstructionVisitor
{
    private static final int PATTERN_INDEX     = 0;
    private static final int REPLACEMENT_INDEX = 1;


    /**
     * Creates a new ConfigurationLoggingInstructionSequencesReplacer.
     *
     * @param constants               any constants referenced by the pattern
     *                                instructions and replacement instructions.
     * @param instructionSequences    the instruction sequences to be replaced,
     *                                with subsequently the sequence pair index,
     *                                the patten/replacement index (0 or 1),
     *                                and the instruction index in the sequence.
     * @param branchTargetFinder      a branch target finder that has been
     *                                initialized to indicate branch targets
     *                                in the visited code.
     * @param codeAttributeEditor     a code editor that can be used for
     *                                accumulating changes to the code.
     */
    public ConfigurationLoggingInstructionSequencesReplacer(Constant[]          constants,
                                                            Instruction[][][]   instructionSequences,
                                                            BranchTargetFinder  branchTargetFinder,
                                                            CodeAttributeEditor codeAttributeEditor)
    {
        this(constants,
             instructionSequences,
             branchTargetFinder,
             codeAttributeEditor,
             null);
    }


    /**
     * Creates a new ConfigurationLoggingInstructionSequencesReplacer.
     *
     * @param constants               any constants referenced by the pattern
     *                                instructions and replacement instructions.
     * @param instructionSequences    the instruction sequences to be replaced,
     *                                with subsequently the sequence pair index,
     *                                the patten/replacement index (0 or 1),
     *                                and the instruction index in the sequence.
     * @param branchTargetFinder      a branch target finder that has been
     *                                initialized to indicate branch targets
     *                                in the visited code.
     * @param codeAttributeEditor     a code editor that can be used for
     *                                accumulating changes to the code.
     * @param extraInstructionVisitor an optional extra visitor for all deleted
     *                                load instructions.
     */
    public ConfigurationLoggingInstructionSequencesReplacer(Constant[]          constants,
                                                            Instruction[][][]   instructionSequences,
                                                            BranchTargetFinder  branchTargetFinder,
                                                            CodeAttributeEditor codeAttributeEditor,
                                                            InstructionVisitor  extraInstructionVisitor)
    {
        super(createInstructionSequenceReplacers(constants,
                                                 instructionSequences,
                                                 branchTargetFinder,
                                                 codeAttributeEditor,
                                                 extraInstructionVisitor));
    }


    /**
     * Creates an array of InstructionSequenceReplacer instances.
     *
     * @param constants               any constants referenced by the pattern
     *                                instructions and replacement instructions.
     * @param instructionSequences    the instruction sequences to be replaced,
     *                                with subsequently the sequence pair index,
     *                                the from/to index (0 or 1), and the
     *                                instruction index in the sequence.
     * @param branchTargetFinder      a branch target finder that has been
     *                                initialized to indicate branch targets
     *                                in the visited code.
     * @param codeAttributeEditor     a code editor that can be used for
     *                                accumulating changes to the code.
     * @param extraInstructionVisitor an optional extra visitor for all deleted
     *                                load instructions.
     */
    private static InstructionVisitor[] createInstructionSequenceReplacers(Constant[]          constants,
                                                                           Instruction[][][]   instructionSequences,
                                                                           BranchTargetFinder  branchTargetFinder,
                                                                           CodeAttributeEditor codeAttributeEditor,
                                                                           InstructionVisitor  extraInstructionVisitor)
    {
        InstructionVisitor[] instructionSequenceReplacers =
            new InstructionSequenceReplacer[instructionSequences.length];

        for (int index = 0; index < instructionSequenceReplacers.length; index++)
        {
            Instruction[][] instructionSequencePair = instructionSequences[index];
            instructionSequenceReplacers[index] =
                new ConfigurationLoggingInstructionSequenceReplacer(constants,
                                                                    instructionSequencePair[PATTERN_INDEX],
                                                                    constants,
                                                                    instructionSequencePair[REPLACEMENT_INDEX],
                                                                    branchTargetFinder,
                                                                    codeAttributeEditor,
                                                                    extraInstructionVisitor);
        }

        return instructionSequenceReplacers;
    }
}