net.bytebuddy.implementation.bytecode.constant.FloatConstant 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 float} constant onto the operand stack.
*/
public enum FloatConstant implements StackManipulation {
/**
* A {@code float} constant of value {@code 0.0f}.
*/
ZERO(Opcodes.FCONST_0),
/**
* A {@code float} constant of value {@code 1.0f}.
*/
ONE(Opcodes.FCONST_1),
/**
* A {@code float} constant of value {@code 2.0f}.
*/
TWO(Opcodes.FCONST_2);
/**
* The size impact of loading a {@code float} constant onto the operand stack.
*/
private static final Size SIZE = StackSize.SINGLE.toIncreasingSize();
/**
* The shortcut opcode for loading a {@code float} constant.
*/
private final int opcode;
/**
* Creates a new shortcut operation for loading a common {@code float} onto the operand stack.
*
* @param opcode The shortcut opcode for loading a {@code float} constant.
*/
FloatConstant(int opcode) {
this.opcode = opcode;
}
/**
* Creates a stack manipulation for loading a {@code float} 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 float} value to load onto the stack.
* @return A stack manipulation for loading the given {@code float} value.
*/
public static StackManipulation forValue(float value) {
if (value == 0f) {
return ZERO;
} else if (value == 1f) {
return ONE;
} else if (value == 2f) {
return TWO;
} else {
return new ConstantPool(value);
}
}
/**
* {@inheritDoc}
*/
public boolean isValid() {
return true;
}
/**
* {@inheritDoc}
*/
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext) {
methodVisitor.visitInsn(opcode);
return SIZE;
}
/**
* A stack manipulation for loading a {@code float} value from a class's constant pool onto the operand stack.
*/
@HashCodeAndEqualsPlugin.Enhance
protected static class ConstantPool extends StackManipulation.AbstractBase {
/**
* The {@code float} value to be loaded onto the operand stack.
*/
private final float value;
/**
* Creates a new constant pool load operation.
*
* @param value The {@code float} value to be loaded onto the operand stack.
*/
protected ConstantPool(float value) {
this.value = value;
}
/**
* {@inheritDoc}
*/
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext) {
methodVisitor.visitLdcInsn(value);
return SIZE;
}
}
}