ivannosys3/src/IntermediaryCode/RemoveUnusedLabelsProcessor.java

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package IntermediaryCode;

import API.Utils;
import common.Block;
import common.Code;
import common.Instruction;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;

/**
 *
 * @author EUGENIO CARVALHO
 */
class RemoveUnusedLabelsProcessor implements CodeProcessing {

    public RemoveUnusedLabelsProcessor() {
    }

    @Override
    public void Exec(Code c, LinkedHashMap<String, CodeProcessing> cp) throws Exception {
        String label;
        Instruction instruction = null;
        Block block = c.Block();

        HashMap<String, Integer> rc = c.labelsReferenceCount;
        LinkedList<Instruction> instructions = block.Instructions();
        ArrayList<Instruction> remover = new ArrayList();
        Iterator<Instruction> interator = instructions.iterator();
        String[] ignore = new String[]{"block", "user"};
        Instruction branch = null, last;
        int position = 0;

        System.out.println("block:" + block.getName() + "-------------------------------");

        // Remove todos os labels não referenciados
        while (interator.hasNext()) {
            position++;
            last = instruction;
            instruction = interator.next();

//            System.out.println("instruction:" + instruction);
            if (instruction.eq("type", "branch")) {
                branch = instruction;
                position = 0;
            }

            if (position == 3 && branch != null && last.eq("type", "jump")) {
                System.out.println(":" + branch + last);
                branch.S("op", Utils.ComplementOperation(branch.G("op")))
                        .S("label", last.G("label"));
                branch = null;
//                instructions.remove(last);
//                interator.remove();

//                interator.remove(last);
                remover.add(last);
                remover.add(instruction);
                
//                System.out.println("'ERA UMA LABEL:" + instruction);
                continue;
            }
//            if (position == 1 //                    && instruction.eq("type", "label") //                    && (last != null && last.eq("type", "jump"))
//                    ) {
//
////
////                instructions.remove(last);
////                instructions.remove(instruction);
////
////                continue;
//            }

            if (!instruction.eq("type", "label") || instruction.in("label_type", ignore)) {
                continue;
            }

            label = instruction.G("label");
            if (!rc.containsKey(label) || rc.get(label) == 0) {
                interator.remove();
            }
        }

//        System.out.println("Remover:" + remover);
        for (Instruction r : remover) {
            instructions.remove(r);
        }
    }
}