org.apache.logging.log4j.weaver.LocationClassVisitor Maven / Gradle / Ivy

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you 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 org.apache.logging.log4j.weaver;

import static org.apache.logging.log4j.weaver.Constants.MESSAGE_SUPPLIER_TYPE;
import static org.apache.logging.log4j.weaver.Constants.MESSAGE_TYPE;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.apache.logging.log4j.weaver.LocationCacheGenerator.LocationCacheValue;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.Handle;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;

public class LocationClassVisitor extends ClassVisitor {

    private final LocationCacheGenerator locationCache;
    private final Map conversionHandlers;

    private String fileName;
    private String declaringClass;
    private String methodName;

    protected LocationClassVisitor(ClassVisitor cv, LocationCacheGenerator locationCache) {
        super(Opcodes.ASM9, cv);
        this.locationCache = locationCache;
        this.conversionHandlers = new HashMap<>();
    }

    @Override
    public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
        this.declaringClass = name;
        super.visit(version, access, name, signature, superName, interfaces);
    }

    @Override
    public void visitSource(String source, String debug) {
        this.fileName = source;
        super.visitSource(source, debug);
    }

    @Override
    public MethodVisitor visitMethod(
            int access, String name, String descriptor, String signature, String[] exceptions) {
        this.methodName = name;
        final MethodVisitor mv = super.visitMethod(access, name, descriptor, signature, exceptions);
        return mv != null
                ? new LocationMethodVisitor(
                        this, Collections.unmodifiableMap(conversionHandlers), mv, access, name, descriptor)
                : null;
    }

    public void addClassConversionHandler(final ClassConversionHandler handler) {
        this.conversionHandlers.put(handler.getOwner(), handler);
    }

    public LocationCacheValue addStackTraceElement(final int lineNumber) {
        return locationCache.addLocation(declaringClass, methodName, fileName, lineNumber);
    }

    public Handle createLambda(SupplierLambdaType type) {
        switch (type) {
            case MESSAGE_SUPPLIER:
                return new Handle(
                        Opcodes.H_INVOKEINTERFACE,
                        MESSAGE_SUPPLIER_TYPE.getInternalName(),
                        "get",
                        Type.getMethodDescriptor(MESSAGE_TYPE),
                        true);
            default:
                return locationCache.createLambda(declaringClass, type);
        }
    }
}