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Reflection Library for the Scala Programming Language
/*
* Scala (https://www.scala-lang.org)
*
* Copyright EPFL and Lightbend, Inc.
*
* Licensed under Apache License 2.0
* (http://www.apache.org/licenses/LICENSE-2.0).
*
* See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
package scala
package reflect
package internal
// Flags at each index of a flags Long. Those marked with /M are used in
// Parsers/JavaParsers and therefore definitely appear on Modifiers; but the
// absence of /M on the other flags does not imply they aren't.
//
// Generated by mkFlagsTable() at Thu Feb 02 20:31:52 PST 2012
//
// 0: PROTECTED/M
// 1: OVERRIDE/M
// 2: PRIVATE/M
// 3: ABSTRACT/M
// 4: DEFERRED/M
// 5: FINAL/M
// 6: METHOD
// 7: INTERFACE/M
// 8: MODULE
// 9: IMPLICIT/M
// 10: SEALED/M
// 11: CASE/M
// 12: MUTABLE/M
// 13: PARAM/M
// 14: PACKAGE
// 15: MACRO/M
// 16: BYNAMEPARAM/M CAPTURED COVARIANT/M
// 17: CONTRAVARIANT/M INCONSTRUCTOR LABEL
// 18: ABSOVERRIDE/M
// 19: LOCAL/M
// 20: JAVA/M
// 21: SYNTHETIC
// 22: STABLE
// 23: STATIC/M
// 24: CASEACCESSOR/M
// 25: DEFAULTPARAM/M TRAIT/M
// 26: BRIDGE
// 27: ACCESSOR
// 28: SUPERACCESSOR
// 29: PARAMACCESSOR/M
// 30: MODULEVAR
// 31: LAZY/M
// 32: IS_ERROR
// 33: OVERLOADED
// 34: LIFTED
// 35: EXISTENTIAL MIXEDIN
// 36: EXPANDEDNAME
// 37: PRESUPER/M
// 38: TRANS_FLAG
// 39: LOCKED
// 40: SPECIALIZED
// 41: DEFAULTINIT/M
// 42: VBRIDGE
// 43: VARARGS
// 44: TRIEDCOOKING
// 45: SYNCHRONIZED/M
// 46: ARTIFACT
// 47: JAVA_DEFAULTMETHOD/M
// 48: JAVA_ENUM
// 49: JAVA_ANNOTATION
// 50:
// 51: lateDEFERRED
// 52: lateFINAL
// 53: lateMETHOD
// 54: lateINTERFACE
// 55: lateMODULE
// 56: notPROTECTED
// 57: notOVERRIDE
// 58: notPRIVATE
// 59:
// 60: SCALA3X
// 61:
// 62:
// 63:
/** Flags set on Modifiers instances in the parsing stage.
*/
class ModifierFlags {
final val IMPLICIT = 1L << 9
final val FINAL = 1L << 5 // May not be overridden. Note that java final implies much more than scala final.
final val PRIVATE = 1L << 2
final val PROTECTED = 1L << 0
final val SEALED = 1L << 10
final val OVERRIDE = 1L << 1
final val CASE = 1L << 11
final val ABSTRACT = 1L << 3 // abstract class, or used in conjunction with abstract override.
// Note difference to DEFERRED!
final val DEFERRED = 1L << 4 // was `abstract` for members | trait is virtual
final val INTERFACE = 1L << 7 // symbol is an interface. the flag is set for:
// - scala-defined traits with only abstract methods or fields
// - any java-defined interface (even if it has default methods)
final val MUTABLE = 1L << 12 // symbol is a mutable variable.
final val PARAM = 1L << 13 // symbol is a (value or type) parameter to a method
final val MACRO = 1L << 15 // symbol is a macro definition
final val COVARIANT = 1L << 16 // symbol is a covariant type variable
final val BYNAMEPARAM = 1L << 16 // parameter is by name
final val CONTRAVARIANT = 1L << 17 // symbol is a contravariant type variable
final val ABSOVERRIDE = 1L << 18 // combination of abstract & override
final val LOCAL = 1L << 19 // symbol is local to current class (i.e. private[this] or protected[this]
// pre: PRIVATE or PROTECTED are also set
final val JAVA = 1L << 20 // symbol was defined by a Java class
final val SCALA3X = 1L << 60 // class was defined in Scala 3
final val STATIC = 1L << 23 // static field, method or class
final val CASEACCESSOR = 1L << 24 // symbol is a case parameter (or its accessor, or a GADT skolem)
final val TRAIT = 1L << 25 // symbol is a trait
final val DEFAULTPARAM = 1L << 25 // the parameter has a default value
final val PARAMACCESSOR = 1L << 29 // for field definitions generated for primary constructor
// parameters (no matter if it's a 'val' parameter or not)
// for parameters of a primary constructor ('val' or not)
// for the accessor methods generated for 'val' or 'var' parameters
final val LAZY = 1L << 31 // symbol is a lazy val. can't have MUTABLE unless transformed by typer
final val PRESUPER = 1L << 37 // value is evaluated before super call
final val DEFAULTINIT = 1L << 41 // symbol is initialized to the default value: used by -Xcheckinit
final val ARTIFACT = 1L << 46 // symbol should be ignored when typechecking; will be marked ACC_SYNTHETIC in bytecode
// to see which symbols are marked as ARTIFACT, see scaladocs for FlagValues.ARTIFACT
final val JAVA_DEFAULTMETHOD = 1L << 47 // symbol is a java default method
final val JAVA_ENUM = 1L << 48 // symbol is a java enum
final val JAVA_ANNOTATION = 1L << 49 // symbol is a java annotation
// Overridden.
def flagToString(flag: Long): String = ""
final val PrivateLocal = PRIVATE | LOCAL
final val ProtectedLocal = PROTECTED | LOCAL
final val AccessFlags = PRIVATE | PROTECTED | LOCAL
}
object ModifierFlags extends ModifierFlags
/** All flags and associated operations */
class Flags extends ModifierFlags {
final val METHOD = 1L << 6 // a method
final val MODULE = 1L << 8 // symbol is module or class implementing a module
final val PACKAGE = 1L << 14 // symbol is a java package
final val CAPTURED = 1L << 16 // variable is accessed from nested function. Set by LambdaLift.
final val LABEL = 1L << 17 // method symbol is a label. Set by TailCall
final val INCONSTRUCTOR = 1L << 17 // class symbol is defined in this/superclass constructor.
final val SYNTHETIC = 1L << 21 // symbol is compiler-generated (compare with ARTIFACT)
final val STABLE = 1L << 22 // functions that are assumed to be stable
// (typically, access methods for valdefs)
// or classes that do not contain abstract types.
final val BRIDGE = 1L << 26 // function is a bridge method. Set by Erasure
final val ACCESSOR = 1L << 27 // a value or variable accessor (getter or setter)
final val SUPERACCESSOR = 1L << 28 // a super accessor
final val MODULEVAR = 1L << 30 // for variables: is the variable caching a module value
final val IS_ERROR = 1L << 32 // symbol is an error symbol
final val OVERLOADED = 1L << 33 // symbol is overloaded
final val LIFTED = 1L << 34 // class has been lifted out to package level
// local value has been lifted out to class level
// todo: make LIFTED = latePRIVATE?
final val MIXEDIN = 1L << 35 // term member has been mixed in
final val EXISTENTIAL = 1L << 35 // type is an existential parameter or skolem
final val EXPANDEDNAME = 1L << 36 // name has been expanded with class suffix
final val TRANS_FLAG = 1L << 38 // transient flag guaranteed to be reset after each phase.
final val LOCKED = 1L << 39 // temporary flag to catch cyclic dependencies
final val SPECIALIZED = 1L << 40 // symbol is a generated specialized member
final val VBRIDGE = 1L << 42 // symbol is a varargs bridge (but not a bridge at the bytecode level)
final val VARARGS = 1L << 43 // symbol is a Java-style varargs method
final val TRIEDCOOKING = 1L << 44 // `Cooking` has been tried on this symbol
// A Java method's type is `cooked` by transforming raw types to existentials
final val SYNCHRONIZED = 1L << 45 // symbol is a method which should be marked ACC_SYNCHRONIZED
final val SYNTHESIZE_IMPL_IN_SUBCLASS = 1L << 50 // used in fields phase to indicate this accessor should receive an implementation in a subclass
// flags used strictly internally in the Fields phase (info/tree transform):
final val NEEDS_TREES = 1L << 59 // this symbol needs a tree. (distinct from SYNTHESIZE_IMPL_IN_SUBCLASS)
// ------- shift definitions -------------------------------------------------------
//
// Flags from 1L to (1L << 50) are normal flags.
//
// The "late" counterpart to flags DEFERRED (1L << 4) to MODULE (1L << 8)
// show up in `sym.flags` as their regular counterpart once the phase mask admits them (see below).
// The first late flag (lateDEFERRED) is at (1L << 51), i.e., late flags are shifted by 47. The last one is (1L << 55).
// Think of it as a poor man's flag history akin to the type history for a symbol's info.
//
// The "not" counterpart to flags PROTECTED (1L) to PRIVATE (1L << 2)
// are negated flags that suppress their counterpart after a specific phase (see below).
// They are shifted by 56, i.e., the first negated flag (notPROTECTED) is at (1L << 56), the last at (1L << 58).
//
// Late and negative flags are only enabled after certain phases, implemented by the phaseNewFlags
// method of the SubComponent, so they implement a bit of a flag history.
//
// The flags (1L << 59) to (1L << 63) are currently unused. If added to the InitialFlags mask,
// they could be used as normal flags.
final val InitialFlags = 0x1007FFFFFFFFFFFFL // normal flags, enabled from the first phase: 1L to (1L << 50) + (1L << 60)
final val LateFlags = 0x00F8000000000000L // flags that override flags in (1L << 4) to (1L << 8): DEFERRED, FINAL, INTERFACE, METHOD, MODULE
final val AntiFlags = 0x0700000000000000L // flags that cancel flags in 1L to (1L << 2): PROTECTED, OVERRIDE, PRIVATE
final val LateShift = 47
final val AntiShift = 56
/** all of the flags that are unaffected by phase */
final val PhaseIndependentFlags = 0xF807FFFFFFFFFE08L
//this should be
// final val PhaseIndependentFlags = (-1L & ~LateFlags & ~AntiFlags & ~(LateFlags >>> LateShift) & ~(AntiFlags >>> AntiShift)))
// but the constant folder does not optimise this! Good news is that is expected to be fixed soon :-)
assert (PhaseIndependentFlags == (-1L & ~LateFlags & ~AntiFlags & ~(LateFlags >>> LateShift) & ~(AntiFlags >>> AntiShift)))
// Flags which sketchily share the same slot
// 16: BYNAMEPARAM/M CAPTURED COVARIANT/M
// 17: CONTRAVARIANT/M INCONSTRUCTOR LABEL
// 25: DEFAULTPARAM/M TRAIT/M
// 35: EXISTENTIAL MIXEDIN
final val OverloadedFlagsMask = 0L | BYNAMEPARAM | CONTRAVARIANT | DEFAULTPARAM | EXISTENTIAL
// ------- late flags (set by a transformer phase) ---------------------------------
//
// Summary of when these are claimed to be first used.
// You can get this output with scalac -Vphases -Vdebug.
//
// refchecks 7 [START]
// specialize 13 [START]
// explicitouter 14 [START]
// erasure 15 [START]
// mixin 20 [START]
//
// notPRIVATE set in Symbols#makeNotPrivate, IExplicitOuter#transform, Inliners.
// notPROTECTED set in ExplicitOuter#transform.
// final val lateDEFERRED = (0L + DEFERRED) << LateShift // unused
// final val lateFINAL = (0L + FINAL) << LateShift // only used for inliner -- could be subsumed by notPRIVATE?
// final val lateMETHOD = (0L + METHOD) << LateShift // unused
// final val lateMODULE = (0L + MODULE) << LateShift // unused
// final val notOVERRIDE = (0L + OVERRIDE) << AntiShift // unused
final val notPRIVATE = (0L + PRIVATE) << AntiShift
final val notPROTECTED = (0L + PROTECTED) << AntiShift
// ------- masks -----------------------------------------------------------------------
/** To be a little clearer to people who aren't habitual bit twiddlers.
*/
final val AllFlags = -1L
// TODO - there's no call to slap four flags onto every package.
final val PackageFlags = MODULE | PACKAGE | FINAL | JAVA
// FINAL not included here due to possibility of object overriding.
// In fact, FINAL should not be attached regardless. We should be able
// to reconstruct whether an object was marked final in source.
final val ModuleFlags = MODULE
/** These modifiers can be set explicitly in source programs. This is
* used only as the basis for the default flag mask (which ones to display
* when printing a normal message.)
*/
final val ExplicitFlags =
PRIVATE | PROTECTED | ABSTRACT | FINAL | SEALED |
OVERRIDE | CASE | IMPLICIT | ABSOVERRIDE | LAZY | JAVA_DEFAULTMETHOD
/** The two bridge flags */
final val BridgeFlags = BRIDGE | VBRIDGE
final val BridgeAndPrivateFlags = BridgeFlags | PRIVATE
/** These modifiers appear in TreePrinter output. */
final val PrintableFlags =
ExplicitFlags | BridgeFlags | LOCAL | SYNTHETIC | STABLE | CASEACCESSOR | MACRO |
ACCESSOR | SUPERACCESSOR | PARAMACCESSOR | STATIC | SPECIALIZED | SYNCHRONIZED | ARTIFACT |
SYNTHESIZE_IMPL_IN_SUBCLASS | NEEDS_TREES
/** When a symbol for a field is created, only these flags survive
* from Modifiers. Others which may be applied at creation time are:
* PRIVATE, LOCAL.
*/
final val FieldFlags =
MUTABLE | CASEACCESSOR | PARAMACCESSOR | STATIC | FINAL | PRESUPER | LAZY | DEFAULTINIT
/** Masks for getters and setters, where the flags are derived from those
* on the field's modifiers. Both getters and setters get the ACCESSOR flag.
* Getters of immutable values also get STABLE.
*/
final val GetterFlags = ~(PRESUPER | MUTABLE)
final val SetterFlags = ~(PRESUPER | MUTABLE | STABLE | CASEACCESSOR | IMPLICIT)
/** Since DEFAULTPARAM is overloaded with TRAIT, we need some additional
* means of determining what that bit means. Usually DEFAULTPARAM is coupled
* with PARAM, which suffices. Default getters get METHOD instead.
* This constant is the mask of flags which can survive from the parameter modifiers.
* See paramFlagsToDefaultGetter for the full logic.
*/
final val DefaultGetterFlags = PRIVATE | PROTECTED | FINAL | PARAMACCESSOR
/** When a symbol for a method parameter is created, only these flags survive
* from Modifiers. Others which may be applied at creation time are:
* SYNTHETIC.
*/
final val ValueParameterFlags = BYNAMEPARAM | IMPLICIT | DEFAULTPARAM | STABLE | SYNTHETIC
final val BeanPropertyFlags = DEFERRED | OVERRIDE | STATIC
final val VarianceFlags = COVARIANT | CONTRAVARIANT
/** These appear to be flags which should be transferred from owner symbol
* to a newly created constructor symbol.
*/
final val ConstrFlags = JAVA
/** Module flags inherited by their module-class */
final val ModuleToClassFlags = AccessFlags | PackageFlags | CASE | SYNTHETIC
final val ValidAliasFlags = SUPERACCESSOR | PARAMACCESSOR | MIXEDIN | SPECIALIZED
/** These flags are not pickled */
final val FlagsNotPickled = IS_ERROR | OVERLOADED | LIFTED | TRANS_FLAG | LOCKED | TRIEDCOOKING | SCALA3X
// A precaution against future additions to FlagsNotPickled turning out
// to be overloaded flags thus not-pickling more than intended.
assert(
(OverloadedFlagsMask & FlagsNotPickled) == 0,
"overloaded flags should not overlap with FlagsNotPickled; found: " +
flagsToString(OverloadedFlagsMask & FlagsNotPickled)
)
/** These flags are pickled */
final val PickledFlags = (
(InitialFlags & ~FlagsNotPickled)
| notPRIVATE // for value class constructors (scala/bug#6601), and private members referenced
// in @inline-marked methods publicized in SuperAccessors (see scala/bug#6608, e6b4204604)
)
/** If we have a top-level class or module
* and someone asks us for a flag not in TopLevelPickledFlags,
* then we don't need unpickling to give a definite answer.
*/
final val TopLevelPickledFlags = PickledFlags & ~(MODULE | METHOD | PACKAGE | PARAM | EXISTENTIAL)
def paramFlagsToDefaultGetter(paramFlags: Long): Long =
(paramFlags & DefaultGetterFlags) | SYNTHETIC | METHOD | DEFAULTPARAM
def getterFlags(fieldFlags: Long): Long = ACCESSOR + (
if ((fieldFlags & MUTABLE) != 0) fieldFlags & ~MUTABLE & ~PRESUPER
else fieldFlags & ~PRESUPER | STABLE
)
def setterFlags(fieldFlags: Long): Long =
getterFlags(fieldFlags) & ~STABLE & ~CASEACCESSOR
// ------- pickling and unpickling of flags -----------------------------------------------
// The flags from 0x001 to 0x800 are different in the raw flags
// and in the pickled format.
private final val IMPLICIT_PKL = (1L << 0)
private final val FINAL_PKL = (1L << 1)
private final val PRIVATE_PKL = (1L << 2)
private final val PROTECTED_PKL = (1L << 3)
private final val SEALED_PKL = (1L << 4)
private final val OVERRIDE_PKL = (1L << 5)
private final val CASE_PKL = (1L << 6)
private final val ABSTRACT_PKL = (1L << 7)
private final val DEFERRED_PKL = (1L << 8)
private final val METHOD_PKL = (1L << 9)
private final val MODULE_PKL = (1L << 10)
private final val INTERFACE_PKL = (1L << 11)
private final val PKL_MASK = 0x00000FFF
/** Pickler correspondence, ordered roughly by frequency of occurrence */
private def rawPickledCorrespondence = Array[(Long, Long)](
(METHOD, METHOD_PKL),
(PRIVATE, PRIVATE_PKL),
(FINAL, FINAL_PKL),
(PROTECTED, PROTECTED_PKL),
(CASE, CASE_PKL),
(DEFERRED, DEFERRED_PKL),
(MODULE, MODULE_PKL),
(OVERRIDE, OVERRIDE_PKL),
(INTERFACE, INTERFACE_PKL),
(IMPLICIT, IMPLICIT_PKL),
(SEALED, SEALED_PKL),
(ABSTRACT, ABSTRACT_PKL)
)
private[this] val mappedRawFlags = rawPickledCorrespondence map (_._1)
private[this] val mappedPickledFlags = rawPickledCorrespondence map (_._2)
private class MapFlags(from: Array[Long], to: Array[Long]) extends (Long => Long) {
val fromSet = from.foldLeft(0L) (_ | _)
def apply(flags: Long): Long = {
var result = flags & ~fromSet
var tobeMapped = flags & fromSet
var i = 0
while (tobeMapped != 0) {
if ((tobeMapped & from(i)) != 0) {
result |= to(i)
tobeMapped &= ~from(i)
}
i += 1
}
result
}
}
val rawToPickledFlags: Long => Long = new MapFlags(mappedRawFlags, mappedPickledFlags)
val pickledToRawFlags: Long => Long = new MapFlags(mappedPickledFlags, mappedRawFlags)
// ------ displaying flags --------------------------------------------------------
// Generated by mkFlagToStringMethod() at Thu Feb 02 20:31:52 PST 2012
@annotation.switch override def flagToString(flag: Long): String = flag match {
case PROTECTED => "protected" // (1L << 0)
case OVERRIDE => "override" // (1L << 1)
case PRIVATE => "private" // (1L << 2)
case ABSTRACT => "abstract" // (1L << 3)
case DEFERRED => "" // (1L << 4)
case FINAL => "final" // (1L << 5)
case METHOD => "" // (1L << 6)
case INTERFACE => "" // (1L << 7)
case MODULE => "" // (1L << 8)
case IMPLICIT => "implicit" // (1L << 9)
case SEALED => "sealed" // (1L << 10)
case CASE => "case" // (1L << 11)
case MUTABLE => "" // (1L << 12)
case PARAM => "" // (1L << 13)
case PACKAGE => "" // (1L << 14)
case MACRO => "" // (1L << 15)
case BYNAMEPARAM => "" // (1L << 16)
case CONTRAVARIANT => "" // (1L << 17)
case ABSOVERRIDE => "abstract override" // (1L << 18)
case LOCAL => "" // (1L << 19)
case JAVA => "" // (1L << 20)
case SYNTHETIC => "" // (1L << 21)
case STABLE => "" // (1L << 22)
case STATIC => "" // (1L << 23)
case CASEACCESSOR => "" // (1L << 24)
case DEFAULTPARAM => "" // (1L << 25)
case BRIDGE => "" // (1L << 26)
case ACCESSOR => "" // (1L << 27)
case SUPERACCESSOR => "" // (1L << 28)
case PARAMACCESSOR => "" // (1L << 29)
case MODULEVAR => "" // (1L << 30)
case LAZY => "lazy" // (1L << 31)
case IS_ERROR => "" // (1L << 32)
case OVERLOADED => "" // (1L << 33)
case LIFTED => "" // (1L << 34)
case EXISTENTIAL => "" // (1L << 35)
case EXPANDEDNAME => "" // (1L << 36)
case PRESUPER => "" // (1L << 37)
case TRANS_FLAG => "" // (1L << 38)
case LOCKED => "" // (1L << 39)
case SPECIALIZED => "" // (1L << 40)
case DEFAULTINIT => "" // (1L << 41)
case VBRIDGE => "" // (1L << 42)
case VARARGS => "" // (1L << 43)
case TRIEDCOOKING => "" // (1L << 44)
case SYNCHRONIZED => "" // (1L << 45)
case ARTIFACT => "" // (1L << 46)
case JAVA_DEFAULTMETHOD => "" // (1L << 47)
case JAVA_ENUM => "" // (1L << 48)
case JAVA_ANNOTATION => "" // (1L << 49)
case SYNTHESIZE_IMPL_IN_SUBCLASS => "" // (1L << 50)
case 0x08000000000000L => "" // (1L << 51)
case 0x10000000000000L => "" // (1L << 52)
case 0x20000000000000L => "" // (1L << 53)
case 0x40000000000000L => "" // (1L << 54)
case 0x80000000000000L => "" // (1L << 55)
case `notPROTECTED` => "" // (1L << 56)
case 0x200000000000000L => "" // (1L << 57)
case `notPRIVATE` => "" // (1L << 58)
case NEEDS_TREES => "" // (1L << 59)
case SCALA3X => "" // (1L << 60)
case 0x2000000000000000L => "" // (1L << 61)
case 0x4000000000000000L => "" // (1L << 62)
case 0x8000000000000000L => "" // (1L << 63)
case _ => ""
}
private def accessString(flags: Long, privateWithin: String)= (
if (privateWithin == "") {
if ((flags & PrivateLocal) == PrivateLocal) "private[this]"
else if ((flags & ProtectedLocal) == ProtectedLocal) "protected[this]"
else if ((flags & PRIVATE) != 0) "private"
else if ((flags & PROTECTED) != 0) "protected"
else ""
}
else if ((flags & PROTECTED) != 0) "protected[" + privateWithin + "]"
else "private[" + privateWithin + "]"
)
// FIXME: This method is used several places internally. Remove its
// internal use and then re-deprecate it.
// @deprecated("use flagString on the flag-carrying member", "2.10.0")
private[scala] def flagsToString(flags: Long, privateWithin: String): String = {
val access = accessString(flags, privateWithin)
val nonAccess = flagsToString(flags & ~AccessFlags)
List(nonAccess, access) filterNot (_ == "") mkString " "
}
// FIXME: This method is used several places internally. Remove its
// internal use and then re-deprecate it.
// @deprecated("use flagString on the flag-carrying member", "2.10.0")
private[scala] def flagsToString(flags: Long): String = {
// Fast path for common case
if (flags == 0L) "" else {
var sb: StringBuilder = null
var i = 0
while (i <= MaxBitPosition) {
val mask = rawFlagPickledOrder(i)
if ((flags & mask) != 0L) {
val s = flagToString(mask)
if (s.length > 0) {
if (sb eq null) sb = new StringBuilder
else if (!sb.isEmpty) sb.append(" ")
sb.append(s)
}
}
i += 1
}
if (sb eq null) "" else sb.toString
}
}
// List of the raw flags, in pickled order
final val MaxBitPosition = 62
final val pickledListOrder: List[Long] = {
val all = 0 to MaxBitPosition map (1L << _)
val front = mappedRawFlags map (_.toLong)
front.toList ++ (all filterNot (front contains _))
}
final val rawFlagPickledOrder: Array[Long] = pickledListOrder.toArray
}
object Flags extends Flags