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 net.bytebuddy.jar.asm.
MethodVisitor;
import net.bytebuddy.jar.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.
* <p> </p>
* 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);
}
}
@
Override
public boolean
isValid() {
return true;
}
@
Override
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 implements
StackManipulation {
/**
* 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;
}
@
Override
public boolean
isValid() {
return true;
}
@
Override
public
Size apply(
MethodVisitor methodVisitor,
Implementation.
Context implementationContext) {
methodVisitor.
visitLdcInsn(
value);
return
SIZE;
}
}
}