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package com.fitbur.bytebuddy.implementation.bytecode.collection;
import com.fitbur.bytebuddy.description.type.TypeDefinition;
import com.fitbur.bytebuddy.description.type.TypeDescription;
import com.fitbur.bytebuddy.implementation.Implementation;
import com.fitbur.bytebuddy.implementation.bytecode.StackManipulation;
import com.fitbur.bytebuddy.implementation.bytecode.StackSize;
import com.fitbur.bytebuddy.implementation.bytecode.constant.IntegerConstant;
import com.fitbur.bytebuddy.jar.asm.MethodVisitor;
import com.fitbur.bytebuddy.jar.asm.Opcodes;
import java.util.List;
/**
* A {@link com.fitbur.bytebuddy.implementation.bytecode.collection.CollectionFactory} that is capable of
* creating an array of a given type with any number of given values.
*/
public class ArrayFactory implements CollectionFactory {
/**
* The component type of the array this array factory is creating.
*/
private final TypeDescription.Generic componentType;
/**
* The array creator delegate that supplies suitable opcodes for the creation of an array and the storage of
* values inside it.
*/
private final ArrayCreator arrayCreator;
/**
* The decrease of stack size after each value storage operation.
*/
private final StackManipulation.Size sizeDecrease;
/**
* Creates a new array factory with a given
* {@link com.fitbur.bytebuddy.implementation.bytecode.collection.ArrayFactory.ArrayCreator}
* without inferring the type from the component type. Normally,
* {@link com.fitbur.bytebuddy.implementation.bytecode.collection.ArrayFactory#forType(com.fitbur.bytebuddy.description.type.TypeDescription.Generic)}
* should be used.
*
* @param componentType The component type of the array factory.
* @param arrayCreator The array creator responsible for providing the correct byte code instructions.
*/
protected ArrayFactory(TypeDescription.Generic componentType, ArrayCreator arrayCreator) {
this.componentType = componentType;
this.arrayCreator = arrayCreator;
// Size decreases by index and array reference (2) and array element (1, 2) after each element storage.
sizeDecrease = StackSize.DOUBLE.toDecreasingSize().aggregate(componentType.getStackSize().toDecreasingSize());
}
/**
* Creates a new array factory for a given component type.
*
* @param componentType The component type of the array that is to be build.
* @return A new array factory for the given type.
*/
public static ArrayFactory forType(TypeDescription.Generic componentType) {
return new ArrayFactory(componentType, makeArrayCreatorFor(componentType));
}
/**
* Creates a suitable array creator for the given component type.
*
* @param componentType The component type of the array to be created.
* @return A suitable array creator.
*/
private static ArrayCreator makeArrayCreatorFor(TypeDefinition componentType) {
if (componentType.isPrimitive()) {
if (componentType.represents(boolean.class)) {
return ArrayCreator.ForPrimitiveType.BOOLEAN;
} else if (componentType.represents(byte.class)) {
return ArrayCreator.ForPrimitiveType.BYTE;
} else if (componentType.represents(short.class)) {
return ArrayCreator.ForPrimitiveType.SHORT;
} else if (componentType.represents(char.class)) {
return ArrayCreator.ForPrimitiveType.CHARACTER;
} else if (componentType.represents(int.class)) {
return ArrayCreator.ForPrimitiveType.INTEGER;
} else if (componentType.represents(long.class)) {
return ArrayCreator.ForPrimitiveType.LONG;
} else if (componentType.represents(float.class)) {
return ArrayCreator.ForPrimitiveType.FLOAT;
} else if (componentType.represents(double.class)) {
return ArrayCreator.ForPrimitiveType.DOUBLE;
} else {
throw new IllegalArgumentException("Cannot create array of type " + componentType);
}
} else {
return new ArrayCreator.ForReferenceType(componentType.asErasure());
}
}
@Override
public StackManipulation withValues(List stackManipulations) {
return new ArrayStackManipulation(stackManipulations);
}
@Override
public TypeDescription.Generic getComponentType() {
return componentType;
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& componentType.equals(((ArrayFactory) other).componentType)
&& arrayCreator.equals(((ArrayFactory) other).arrayCreator);
}
@Override
public int hashCode() {
return componentType.hashCode() + 31 * arrayCreator.hashCode();
}
@Override
public String toString() {
return "ArrayFactory{" +
"componentType=" + componentType +
", arrayCreator=" + arrayCreator +
", sizeDecrease=" + sizeDecrease +
'}';
}
/**
* An array creator is responsible for providing correct byte code instructions for creating an array
* and for storing values into it.
*/
protected interface ArrayCreator extends StackManipulation {
/**
* The creation of an array consumes one slot on the operand stack and adds a new value to it.
* Therefore, the operand stack's size is not altered.
*/
StackManipulation.Size ARRAY_CREATION_SIZE_CHANGE = StackSize.ZERO.toDecreasingSize();
/**
* The opcode instruction for storing a value of the component type inside an array.
*
* @return The correct storage opcode for the represented type.
*/
int getStorageOpcode();
/**
* An array creator implementation for primitive types.
*/
enum ForPrimitiveType implements ArrayCreator {
/**
* An array creator for creating {@code boolean[]} arrays.
*/
BOOLEAN(Opcodes.T_BOOLEAN, Opcodes.BASTORE),
/**
* An array creator for creating {@code byte[]} arrays.
*/
BYTE(Opcodes.T_BYTE, Opcodes.BASTORE),
/**
* An array creator for creating {@code short[]} arrays.
*/
SHORT(Opcodes.T_SHORT, Opcodes.SASTORE),
/**
* An array creator for creating {@code char[]} arrays.
*/
CHARACTER(Opcodes.T_CHAR, Opcodes.CASTORE),
/**
* An array creator for creating {@code int[]} arrays.
*/
INTEGER(Opcodes.T_INT, Opcodes.IASTORE),
/**
* An array creator for creating {@code long[]} arrays.
*/
LONG(Opcodes.T_LONG, Opcodes.LASTORE),
/**
* An array creator for creating {@code float[]} arrays.
*/
FLOAT(Opcodes.T_FLOAT, Opcodes.FASTORE),
/**
* An array creator for creating {@code double[]} arrays.
*/
DOUBLE(Opcodes.T_DOUBLE, Opcodes.DASTORE);
/**
* The opcode for creating an array of this type.
*/
private final int creationOpcode;
/**
* The opcode for storing a value in an array of this type.
*/
private final int storageOpcode;
/**
* Creates a new primitive array creator.
*
* @param creationOpcode The opcode for creating an array of this type.
* @param storageOpcode The opcode for storing a value in an array of this type.
*/
ForPrimitiveType(int creationOpcode, int storageOpcode) {
this.creationOpcode = creationOpcode;
this.storageOpcode = storageOpcode;
}
@Override
public boolean isValid() {
return true;
}
@Override
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext) {
methodVisitor.visitIntInsn(Opcodes.NEWARRAY, creationOpcode);
return ARRAY_CREATION_SIZE_CHANGE;
}
@Override
public int getStorageOpcode() {
return storageOpcode;
}
@Override
public String toString() {
return "ArrayFactory.ArrayCreator.ForPrimitiveType." + name();
}
}
/**
* An array creator implementation for reference types.
*/
class ForReferenceType implements ArrayCreator {
/**
* The internal name of this array's non-primitive component type.
*/
private final String internalTypeName;
/**
* Creates a new array creator for a reference type.
*
* @param referenceType The internal name of this array's non-primitive component type.
*/
protected ForReferenceType(TypeDescription referenceType) {
this.internalTypeName = referenceType.getInternalName();
}
@Override
public boolean isValid() {
return true;
}
@Override
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext) {
methodVisitor.visitTypeInsn(Opcodes.ANEWARRAY, internalTypeName);
return ARRAY_CREATION_SIZE_CHANGE;
}
@Override
public int getStorageOpcode() {
return Opcodes.AASTORE;
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& internalTypeName.equals(((ForReferenceType) other).internalTypeName);
}
@Override
public int hashCode() {
return internalTypeName.hashCode();
}
@Override
public String toString() {
return "ArrayFactory.ArrayCreator.ForReferenceType{" +
"internalTypeName='" + internalTypeName + '\'' +
'}';
}
}
}
/**
* A stack manipulation for creating an array as defined by the enclosing array factory.
*/
protected class ArrayStackManipulation implements StackManipulation {
/**
* A list of value load instructions that are to be stored inside the created array.
*/
private final List stackManipulations;
/**
* Creates a new array loading instruction.
*
* @param stackManipulations A list of value load instructions that are to be stored inside the created array.
*/
protected ArrayStackManipulation(List stackManipulations) {
this.stackManipulations = stackManipulations;
}
@Override
public boolean isValid() {
for (StackManipulation stackManipulation : stackManipulations) {
if (!stackManipulation.isValid()) {
return false;
}
}
return arrayCreator.isValid();
}
@Override
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext) {
Size size = IntegerConstant.forValue(stackManipulations.size()).apply(methodVisitor, implementationContext);
// The array's construction does not alter the stack's size.
size = size.aggregate(arrayCreator.apply(methodVisitor, implementationContext));
int index = 0;
for (StackManipulation stackManipulation : stackManipulations) {
methodVisitor.visitInsn(Opcodes.DUP);
size = size.aggregate(StackSize.SINGLE.toIncreasingSize());
size = size.aggregate(IntegerConstant.forValue(index++).apply(methodVisitor, implementationContext));
size = size.aggregate(stackManipulation.apply(methodVisitor, implementationContext));
methodVisitor.visitInsn(arrayCreator.getStorageOpcode());
size = size.aggregate(sizeDecrease);
}
return size;
}
/**
* Returns the outer instance.
*
* @return The outer instance.
*/
private ArrayFactory getArrayFactory() {
return ArrayFactory.this;
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& ArrayFactory.this.equals(((ArrayStackManipulation) other).getArrayFactory())
&& stackManipulations.equals(((ArrayStackManipulation) other).stackManipulations);
}
@Override
public int hashCode() {
return stackManipulations.hashCode();
}
@Override
public String toString() {
return "ArrayFactory.ArrayStackManipulation{" +
"arrayFactory=" + ArrayFactory.this +
"stackManipulations=" + stackManipulations +
'}';
}
}
}
