lucee.transformer.bytecode.visitor.DecisionIntVisitor.java Source code

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Here is the source code for lucee.transformer.bytecode.visitor.DecisionIntVisitor.java

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/**
 *
 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 * 
 **/
package lucee.transformer.bytecode.visitor;

import lucee.transformer.bytecode.BytecodeContext;

import org.objectweb.asm.Label;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.commons.GeneratorAdapter;

public final class DecisionIntVisitor {

    public static final int GT = Opcodes.IF_ICMPGT;
    public static final int GTE = Opcodes.IF_ICMPGE;
    public static final int LT = Opcodes.IF_ICMPLT;
    public static final int LTE = Opcodes.IF_ICMPLE;
    public static final int EQ = Opcodes.IF_ICMPEQ;
    public static final int NEQ = Opcodes.IF_ICMPNE;

    private int operation;

    public void visitBegin() {

    }

    public void visitMiddle(int operation) {
        this.operation = operation;
    }

    public void visitGT() {
        this.operation = GT;
    }

    public void visitGTE() {
        this.operation = GTE;
    }

    public void visitLT() {
        this.operation = LT;
    }

    public void visitLTE() {
        this.operation = LTE;
    }

    public void visitEQ() {
        this.operation = EQ;
    }

    public void visitNEQ() {
        this.operation = NEQ;
    }

    public void visitEnd(BytecodeContext bc) {
        GeneratorAdapter adapter = bc.getAdapter();

        Label l1 = new Label();
        adapter.visitJumpInsn(operation, l1);
        //mv.visitJumpInsn(IF_ICMPGT, l1);
        adapter.visitInsn(Opcodes.ICONST_0);
        Label l2 = new Label();
        adapter.visitJumpInsn(Opcodes.GOTO, l2);
        adapter.visitLabel(l1);
        adapter.visitInsn(Opcodes.ICONST_1);
        adapter.visitLabel(l2);

    }
}