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package org.robolectric.internal.bytecode;
import com.google.auto.service.AutoService;
import javax.annotation.Priority;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.FieldNode;
import org.objectweb.asm.tree.MethodNode;
/** Decorator which adds Robolectric's shadowing behavior to a class. */
@AutoService(ClassInstrumentor.Decorator.class)
@Priority(Integer.MIN_VALUE)
public class ShadowDecorator implements ClassInstrumentor.Decorator {
private static final String OBJECT_DESC = Type.getDescriptor(Object.class);
private static final Type OBJECT_TYPE = Type.getType(Object.class);
private static final String GET_ROBO_DATA_SIGNATURE = "()Ljava/lang/Object;";
@Override
public void decorate(MutableClass mutableClass) {
mutableClass.addInterface(Type.getInternalName(ShadowedObject.class));
mutableClass.addField(
0,
new FieldNode(
Opcodes.ACC_PUBLIC | Opcodes.ACC_SYNTHETIC | Opcodes.ACC_TRANSIENT,
ShadowConstants.CLASS_HANDLER_DATA_FIELD_NAME,
OBJECT_DESC,
OBJECT_DESC,
null));
addRoboGetDataMethod(mutableClass);
}
private void addRoboGetDataMethod(MutableClass mutableClass) {
MethodNode initMethodNode =
new MethodNode(
Opcodes.ACC_PUBLIC | Opcodes.ACC_SYNTHETIC,
ShadowConstants.GET_ROBO_DATA_METHOD_NAME,
GET_ROBO_DATA_SIGNATURE,
null,
null);
RobolectricGeneratorAdapter generator = new RobolectricGeneratorAdapter(initMethodNode);
generator.loadThis(); // this
generator.getField(
mutableClass.classType,
ShadowConstants.CLASS_HANDLER_DATA_FIELD_NAME,
OBJECT_TYPE); // contents of __robo_data__
generator.returnValue();
generator.endMethod();
mutableClass.addMethod(initMethodNode);
}
}
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