com.google.devtools.build.lib.syntax.compiler.LabelAdder.java Source code

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Here is the source code for com.google.devtools.build.lib.syntax.compiler.LabelAdder.java

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// Copyright 2015 The Bazel Authors. All rights reserved.
//
// 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 com.google.devtools.build.lib.syntax.compiler;

import net.bytebuddy.implementation.Implementation.Context;
import net.bytebuddy.implementation.bytecode.StackManipulation;

import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;

/**
 * Adds a fresh label to the byte code.
 */
public class LabelAdder implements StackManipulation {

    private final Label label;

    public LabelAdder() {
        this.label = new Label();
    }

    public Label getLabel() {
        return label;
    }

    @Override
    public boolean isValid() {
        return true;
    }

    @Override
    public Size apply(MethodVisitor methodVisitor, Context implementationContext) {
        methodVisitor.visitLabel(label);
        return new Size(0, 0);
    }

    @Override
    public String toString() {
        return "Label(" + label + ")";
    }
}