package org.checkerframework.checker.lock.qual;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.checkerframework.framework.qual.DefaultInUncheckedCodeFor;
import org.checkerframework.framework.qual.SubtypeOf;
import org.checkerframework.framework.qual.TypeUseLocation;
/**
* It is unknown what locks guard the value referred to by the annotated variable. Therefore, the
* value can never be dereferenced. The locks that guard it might not even be in scope (might be
* inaccessible) at the location where the <tt>@GuardedByUnknown</tt> annotation is written.
*
* <p><tt>@GuardedByUnknown</tt> is the top of the GuardedBy qualifier hierarchy. Any value can be
* assigned into a variable of type <tt>@GuardedByUnknown</tt>.
*
* @checker_framework.manual #lock-checker Lock Checker
*/
@SubtypeOf({})
@Retention(RetentionPolicy.RUNTIME)
@DefaultInUncheckedCodeFor({TypeUseLocation.RECEIVER})
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
public @interface GuardedByUnknown {}