net.bytebuddy.implementation.bytecode.constant.DoubleConstant 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.constant;
import net.bytebuddy.build.HashCodeAndEqualsPlugin;
import net.bytebuddy.implementation.Implementation;
import net.bytebuddy.implementation.bytecode.StackManipulation;
import net.bytebuddy.implementation.bytecode.StackSize;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* This class is responsible for loading any {@code double} constant onto the operand stack.
*/
public enum DoubleConstant implements StackManipulation {
/**
* A {@code double} constant of value {@code 0.0}.
*/
ZERO(Opcodes.DCONST_0),
/**
* A {@code double} constant of value {@code 1.0}.
*/
ONE(Opcodes.DCONST_1);
/**
* The size impact of loading a {@code double} constant onto the operand stack.
*/
private static final StackManipulation.Size SIZE = StackSize.DOUBLE.toIncreasingSize();
/**
* The shortcut opcode for loading a {@code double} constant.
*/
private final int opcode;
/**
* Creates a new shortcut operation for loading a common {@code double} onto the operand stack.
*
* @param opcode The shortcut opcode for loading a {@code double} constant.
*/
DoubleConstant(int opcode) {
this.opcode = opcode;
}
/**
* Creates a stack manipulation for loading a {@code double} value onto the operand stack.
*
* This is achieved either by invoking a specific opcode, if any, or by creating a constant pool entry.
*
* @param value The {@code double} value to load onto the stack.
* @return A stack manipulation for loading the given {@code double} value.
*/
public static StackManipulation forValue(double value) {
if (value == 0d) {
return ZERO;
} else if (value == 1d) {
return ONE;
} else {
return new ConstantPool(value);
}
}
/**
* {@inheritDoc}
*/
public boolean isValid() {
return true;
}
/**
* {@inheritDoc}
*/
public StackManipulation.Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext) {
methodVisitor.visitInsn(opcode);
return SIZE;
}
/**
* A stack manipulation for loading a {@code double} value from a class's constant pool onto the operand stack.
*/
@HashCodeAndEqualsPlugin.Enhance
protected static class ConstantPool extends StackManipulation.AbstractBase {
/**
* The {@code double} value to be loaded onto the operand stack.
*/
private final double value;
/**
* Creates a new constant pool load operation.
*
* @param value The {@code double} value to be loaded onto the operand stack.
*/
protected ConstantPool(double value) {
this.value = value;
}
/**
* {@inheritDoc}
*/
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext) {
methodVisitor.visitLdcInsn(value);
return SIZE;
}
}
}