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