net.bytebuddy.implementation.bytecode.ShiftRight 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;
import net.bytebuddy.implementation.Implementation;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* A stack manipulation that shifts right two numbers on the operand stack.
*/
public enum ShiftRight implements StackManipulation {
/**
* Shifts right two integers or integer-compatible values.
*/
INTEGER(Opcodes.ISHR, StackSize.SINGLE, Unsigned.INTEGER),
/**
* Shifts right two longs.
*/
LONG(Opcodes.LSHR, StackSize.DOUBLE, Unsigned.LONG);
/**
* The opcode to apply.
*/
private final int opcode;
/**
* The stack size of the shift right primitive.
*/
private final StackSize stackSize;
/**
* The unsigned equivalent of this operation.
*/
private final StackManipulation unsigned;
/**
* Creates a new shift right.
*
* @param opcode The opcode to apply.
* @param stackSize The stack size of the shift right primitive.
* @param unsigned The unsigned equivalent of this operation.
*/
ShiftRight(int opcode, StackSize stackSize, StackManipulation unsigned) {
this.opcode = opcode;
this.stackSize = stackSize;
this.unsigned = unsigned;
}
/**
* Returns the unsigned equivalent of this operation.
*
* @return The unsigned equivalent of this operation.
*/
public StackManipulation toUnsigned() {
return unsigned;
}
/**
* {@inheritDoc}
*/
public boolean isValid() {
return true;
}
/**
* {@inheritDoc}
*/
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext) {
methodVisitor.visitInsn(opcode);
return stackSize.toDecreasingSize();
}
/**
* A stack manipulation that shifts right unsigned two numbers on the operand stack.
*/
protected enum Unsigned implements StackManipulation {
/**
* Shifts right unsigned two integers or integer-compatible values.
*/
INTEGER(Opcodes.IUSHR, StackSize.SINGLE),
/**
* Shifts right unsigned two longs.
*/
LONG(Opcodes.LUSHR, StackSize.DOUBLE);
/**
* The opcode to apply.
*/
private final int opcode;
/**
* The stack size of the shift right unsigned primitive.
*/
private final StackSize stackSize;
/**
* Creates a new shift right unsigned.
*
* @param opcode The opcode to apply.
* @param stackSize The stack size of the shift right unsigned primitive.
*/
Unsigned(int opcode, StackSize stackSize) {
this.opcode = opcode;
this.stackSize = stackSize;
}
/**
* {@inheritDoc}
*/
public boolean isValid() {
return true;
}
/**
* {@inheritDoc}
*/
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext) {
methodVisitor.visitInsn(opcode);
return stackSize.toDecreasingSize();
}
}
}