private void buildCopyStack(
List<StackManipulation> stack,
int iterations,
Method getMethod,
Method putMethod,
long stride)
throws NoSuchFieldException, NoSuchMethodException {
final Field unsafeField = UnsafeCopier.class.getDeclaredField("unsafe");
final StackManipulation copyStack =
new StackManipulation.Compound(
// unsafe.putLong(dest, destOffset, unsafe.getLong(src));
MethodVariableAccess.REFERENCE.loadOffset(0), // ALOAD 0 this
FieldAccess.forField(new FieldDescription.ForLoadedField(unsafeField))
.getter(), // GETFIELD
MethodVariableAccess.REFERENCE.loadOffset(1), // ALOAD 1 dest
MethodVariableAccess.LONG.loadOffset(4), // LLOAD 4 destOffset
MethodVariableAccess.REFERENCE.loadOffset(0), // ALOAD 0 this
FieldAccess.forField(new FieldDescription.ForLoadedField(unsafeField))
.getter(), // GETFIELD
MethodVariableAccess.LONG.loadOffset(2), // LLOAD 2 src
MethodInvocation.invoke(new MethodDescription.ForLoadedMethod(getMethod)),
MethodInvocation.invoke(new MethodDescription.ForLoadedMethod(putMethod)));
final StackManipulation incrementStack =
new StackManipulation.Compound(
// destOffset += 8; src += 8;
MethodVariableAccess.LONG.loadOffset(4), // LLOAD 4 destOffset
LongConstant.forValue(stride), // LDC 8 strideWidth
LongAdd.INSTANCE, // LADD
MethodVariableStore.LONG.storeOffset(4), // LSTORE 4
MethodVariableAccess.LONG.loadOffset(2), // LLOAD 2 src
LongConstant.forValue(stride), // LDC 8 strideWidth
LongAdd.INSTANCE, // LADD
MethodVariableStore.LONG.storeOffset(2) // LSTORE 2
);
for (int i = 0; i < iterations; i++) {
stack.add(copyStack);
stack.add(incrementStack);
}
}
private void buildSetupStack(List<StackManipulation> stack)
throws NoSuchFieldException, NoSuchMethodException {
final StackManipulation setupStack =
new StackManipulation.Compound(
LongConstant.forValue(offset), // LDC offset
MethodVariableStore.LONG.storeOffset(4) // LSTORE 4
);
stack.add(setupStack);
}
/**
* Returns a fixed value from any intercepted method. The fixed value is stored in the constant
* pool if this is possible. Java is capable of storing any primitive value, {@link String} values
* and {@link Class} references in the constant pool. Since Java 7, {@code MethodHandle} as well
* as {@code MethodType} references are also supported. Alternatively, the fixed value is stored
* in a static field.
*
* <p>When a value is stored in the class's constant pool, its identity is lost. If an object's
* identity is important, the {@link FixedValue#reference(Object)} method should be used instead.
*
* @param fixedValue The fixed value to return from the method.
* @return An implementation for the given {@code fixedValue}.
*/
public static AssignerConfigurable value(Object fixedValue) {
Class<?> type = fixedValue.getClass();
if (type == String.class) {
return new ForPoolValue(
new TextConstant((String) fixedValue),
TypeDescription.STRING,
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Class.class) {
return new ForPoolValue(
ClassConstant.of(new TypeDescription.ForLoadedType((Class<?>) fixedValue)),
TypeDescription.CLASS,
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Boolean.class) {
return new ForPoolValue(
IntegerConstant.forValue((Boolean) fixedValue),
new TypeDescription.ForLoadedType(boolean.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Byte.class) {
return new ForPoolValue(
IntegerConstant.forValue((Byte) fixedValue),
new TypeDescription.ForLoadedType(byte.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Short.class) {
return new ForPoolValue(
IntegerConstant.forValue((Short) fixedValue),
new TypeDescription.ForLoadedType(short.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Character.class) {
return new ForPoolValue(
IntegerConstant.forValue((Character) fixedValue),
new TypeDescription.ForLoadedType(char.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Integer.class) {
return new ForPoolValue(
IntegerConstant.forValue((Integer) fixedValue),
new TypeDescription.ForLoadedType(int.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Long.class) {
return new ForPoolValue(
LongConstant.forValue((Long) fixedValue),
new TypeDescription.ForLoadedType(long.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Float.class) {
return new ForPoolValue(
FloatConstant.forValue((Float) fixedValue),
new TypeDescription.ForLoadedType(float.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Double.class) {
return new ForPoolValue(
DoubleConstant.forValue((Double) fixedValue),
new TypeDescription.ForLoadedType(double.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (JavaType.METHOD_HANDLE.getTypeStub().isAssignableFrom(type)) {
return new ForPoolValue(
MethodHandleConstant.of(JavaInstance.MethodHandle.of(fixedValue)),
new TypeDescription.ForLoadedType(type),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (JavaType.METHOD_TYPE.getTypeStub().represents(type)) {
return new ForPoolValue(
MethodTypeConstant.of(JavaInstance.MethodType.of(fixedValue)),
new TypeDescription.ForLoadedType(type),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else {
return reference(fixedValue);
}
}