net.bytebuddy.implementation.bytecode.member.HandleInvocation Maven / Gradle / Ivy
/*
* Copyright 2014 - Present Rafael Winterhalter
*
* 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 net.bytebuddy.implementation.bytecode.member;
import net.bytebuddy.build.HashCodeAndEqualsPlugin;
import net.bytebuddy.implementation.Implementation;
import net.bytebuddy.implementation.bytecode.StackManipulation;
import net.bytebuddy.utility.JavaConstant;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* An exact invocation of a method handle with a polymorphic signature.
*/
@HashCodeAndEqualsPlugin.Enhance
public class HandleInvocation extends StackManipulation.AbstractBase {
/**
* The name of the {@code java.lang.invoke.MethodHandle} type.
*/
private static final String METHOD_HANDLE_NAME = "java/lang/invoke/MethodHandle";
/**
* The name of the {@code invokeExact} method.
*/
private static final String INVOKE_EXACT = "invokeExact";
/**
* The method type of the invoked handle.
*/
private final JavaConstant.MethodType methodType;
/**
* Creates a public invocation of a method handle.
*
* @param methodType The method type of the invoked handle.
*/
public HandleInvocation(JavaConstant.MethodType methodType) {
this.methodType = methodType;
}
/**
* {@inheritDoc}
*/
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext) {
methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, METHOD_HANDLE_NAME, INVOKE_EXACT, methodType.getDescriptor(), false);
int size = methodType.getReturnType().getStackSize().getSize() - methodType.getParameterTypes().getStackSize();
return new Size(size, Math.max(size, 0));
}
}