path: root/packages/rtl-objpas/src/inc/rtti.pp

{
  This file is part of the Free Pascal run time library.
  Copyright (C) 2013 Joost van der Sluis joost@cnoc.nl
  member of the Free Pascal development team.

  Extended RTTI compatibility unit

  See the file COPYING.FPC, included in this distribution,
  for details about the copyright.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
}
unit Rtti experimental;

{$mode objfpc}{$H+}
{$modeswitch advancedrecords}
{$goto on}
{$Assertions on}

{ Note: since the Lazarus IDE is not yet capable of correctly handling generic
  functions it is best to define a InLazIDE define inside the IDE that disables
  the generic code for CodeTools. To do this do this:

  - go to Tools -> Codetools Defines Editor
  - go to Edit -> Insert Node Below -> Define Recurse
  - enter the following values:
      Name: InLazIDE
      Description: Define InLazIDE everywhere
      Variable: InLazIDE
      Value from text: 1
}
{$ifdef InLazIDE}
{$define NoGenericMethods}
{$endif}

interface

uses
  Classes,
  SysUtils,
  typinfo;

type
  TRttiObject = class;
  TRttiType = class;
  TRttiMethod = class;
  TRttiProperty = class;
  TRttiInstanceType = class;

  TFunctionCallCallback = class
  protected
    function GetCodeAddress: CodePointer; virtual; abstract;
  public
    property CodeAddress: CodePointer read GetCodeAddress;
  end;

  TFunctionCallFlag = (
    fcfStatic
  );
  TFunctionCallFlags = set of TFunctionCallFlag;

  TFunctionCallParameterInfo = record
    ParamType: PTypeInfo;
    ParamFlags: TParamFlags;
    ParaLocs: PParameterLocations;
  end;

  IValueData = interface
  ['{1338B2F3-2C21-4798-A641-CA2BC5BF2396}']
    procedure ExtractRawData(ABuffer: pointer);
    procedure ExtractRawDataNoCopy(ABuffer: pointer);
    function GetDataSize: SizeInt;
    function GetReferenceToRawData: pointer;
  end;

  TValueData = record
    FTypeInfo: PTypeInfo;
    FValueData: IValueData;
    case integer of
      0:  (FAsUByte: Byte);
      1:  (FAsUWord: Word);
      2:  (FAsULong: LongWord);
      3:  (FAsObject: Pointer);
      4:  (FAsClass: TClass);
      5:  (FAsSByte: Shortint);
      6:  (FAsSWord: Smallint);
      7:  (FAsSLong: LongInt);
      8:  (FAsSingle: Single);
      9:  (FAsDouble: Double);
      10: (FAsExtended: Extended);
      11: (FAsComp: Comp);
      12: (FAsCurr: Currency);
      13: (FAsUInt64: QWord);
      14: (FAsSInt64: Int64);
      15: (FAsMethod: TMethod);
      16: (FAsPointer: Pointer);
      { FPC addition for open arrays }
      17: (FArrLength: SizeInt; FElSize: SizeInt);
  end;

  { TValue }

  TValue = record
  private
    FData: TValueData;
    function GetDataSize: SizeInt;
    function GetTypeDataProp: PTypeData; inline;
    function GetTypeInfo: PTypeInfo; inline;
    function GetTypeKind: TTypeKind; inline;
    function GetIsEmpty: boolean; inline;
  public
    class function Empty: TValue; static;
    class procedure Make(ABuffer: pointer; ATypeInfo: PTypeInfo; out result: TValue); static;
    { Note: a TValue based on an open array is only valid until the routine having the open array parameter is left! }
    class procedure MakeOpenArray(AArray: Pointer; ALength: SizeInt; ATypeInfo: PTypeInfo; out Result: TValue); static;
{$ifndef NoGenericMethods}
    generic class function From<T>(constref aValue: T): TValue; static; inline;
    { Note: a TValue based on an open array is only valid until the routine having the open array parameter is left! }
    generic class function FromOpenArray<T>(constref aValue: array of T): TValue; static; inline;
{$endif}
    function IsArray: boolean; inline;
    function IsOpenArray: Boolean; inline;
    function AsString: string; inline;
    function AsUnicodeString: UnicodeString;
    function AsAnsiString: AnsiString;
    function AsExtended: Extended;
    function IsClass: boolean; inline;
    function AsClass: TClass;
    function IsObject: boolean; inline;
    function AsObject: TObject;
    function IsOrdinal: boolean; inline;
    function AsOrdinal: Int64;
    function AsBoolean: boolean;
    function AsCurrency: Currency;
    function AsInteger: Integer;
    function AsInt64: Int64;
    function AsUInt64: QWord;
    function AsInterface: IInterface;
    function ToString: String;
    function GetArrayLength: SizeInt;
    function GetArrayElement(AIndex: SizeInt): TValue;
    procedure SetArrayElement(AIndex: SizeInt; constref AValue: TValue);
    function IsType(ATypeInfo: PTypeInfo): boolean; inline;
    function TryAsOrdinal(out AResult: int64): boolean;
    function GetReferenceToRawData: Pointer;
    procedure ExtractRawData(ABuffer: Pointer);
    procedure ExtractRawDataNoCopy(ABuffer: Pointer);
    class operator := (const AValue: String): TValue; inline;
    class operator := (AValue: LongInt): TValue; inline;
    class operator := (AValue: Single): TValue; inline;
    class operator := (AValue: Double): TValue; inline;
{$ifdef FPC_HAS_TYPE_EXTENDED}
    class operator := (AValue: Extended): TValue; inline;
{$endif}
    class operator := (AValue: Currency): TValue; inline;
    class operator := (AValue: Int64): TValue; inline;
    class operator := (AValue: QWord): TValue; inline;
    class operator := (AValue: TObject): TValue; inline;
    class operator := (AValue: TClass): TValue; inline;
    class operator := (AValue: Boolean): TValue; inline;
    property DataSize: SizeInt read GetDataSize;
    property Kind: TTypeKind read GetTypeKind;
    property TypeData: PTypeData read GetTypeDataProp;
    property TypeInfo: PTypeInfo read GetTypeInfo;
    property IsEmpty: boolean read GetIsEmpty;
  end;

  TValueArray = specialize TArray<TValue>;

  { TRttiContext }

  TRttiContext = record
  private
    FContextToken: IInterface;
    function GetByHandle(AHandle: Pointer): TRttiObject;
    procedure AddObject(AObject: TRttiObject);
  public
    class function Create: TRttiContext; static;
    procedure  Free;
    function GetType(ATypeInfo: PTypeInfo): TRttiType;
    function GetType(AClass: TClass): TRttiType;
    //function GetTypes: specialize TArray<TRttiType>;
  end;

  { TRttiObject }

  TRttiObject = class abstract
  protected
    function GetHandle: Pointer; virtual; abstract;
  public
    property Handle: Pointer read GetHandle;
  end;

  { TRttiNamedObject }

  TRttiNamedObject = class(TRttiObject)
  protected
    function GetName: string; virtual;
  public
    property Name: string read GetName;
  end;

  { TRttiType }

  TRttiType = class(TRttiNamedObject)
  private
    FTypeInfo: PTypeInfo;
    FMethods: specialize TArray<TRttiMethod>;
    function GetAsInstance: TRttiInstanceType;
  protected
    FTypeData: PTypeData;
    function GetName: string; override;
    function GetHandle: Pointer; override;
    function GetIsInstance: boolean; virtual;
    function GetIsManaged: boolean; virtual;
    function GetIsOrdinal: boolean; virtual;
    function GetIsRecord: boolean; virtual;
    function GetIsSet: boolean; virtual;
    function GetTypeKind: TTypeKind; virtual;
    function GetTypeSize: integer; virtual;
    function GetBaseType: TRttiType; virtual;
  public
    constructor Create(ATypeInfo : PTypeInfo);
    function GetProperties: specialize TArray<TRttiProperty>; virtual;
    function GetProperty(const AName: string): TRttiProperty; virtual;
    function GetMethods: specialize TArray<TRttiMethod>; virtual;
    function GetMethod(const aName: String): TRttiMethod; virtual;
    function GetDeclaredMethods: specialize TArray<TRttiMethod>; virtual;
    property IsInstance: boolean read GetIsInstance;
    property isManaged: boolean read GetIsManaged;
    property IsOrdinal: boolean read GetIsOrdinal;
    property IsRecord: boolean read GetIsRecord;
    property IsSet: boolean read GetIsSet;
    property BaseType: TRttiType read GetBaseType;
    property AsInstance: TRttiInstanceType read GetAsInstance;
    property TypeKind: TTypeKind read GetTypeKind;
    property TypeSize: integer read GetTypeSize;
  end;

  { TRttiFloatType }

  TRttiFloatType = class(TRttiType)
  private
    function GetFloatType: TFloatType;
  public
    property FloatType: TFloatType read GetFloatType;
  end;


  TRttiStringKind = (skShortString, skAnsiString, skWideString, skUnicodeString);

  { TRttiStringType }

  TRttiStringType = class(TRttiType)
  private
    function GetStringKind: TRttiStringKind;
  public
    property StringKind: TRttiStringKind read GetStringKind;
  end;

  TRttiPointerType = class(TRttiType)
  private
    function GetReferredType: TRttiType;
  public
    property ReferredType: TRttiType read GetReferredType;
  end;

  { TRttiMember }

  TMemberVisibility=(mvPrivate, mvProtected, mvPublic, mvPublished);

  TRttiMember = class(TRttiNamedObject)
  private
    FParent: TRttiType;
  protected
    function GetVisibility: TMemberVisibility; virtual;
  public
    constructor Create(AParent: TRttiType);
    property Visibility: TMemberVisibility read GetVisibility;
    property Parent: TRttiType read FParent;
  end;

  { TRttiProperty }

  TRttiProperty = class(TRttiMember)
  private
    FPropInfo: PPropInfo;
    function GetPropertyType: TRttiType;
    function GetIsWritable: boolean;
    function GetIsReadable: boolean;
  protected
    function GetVisibility: TMemberVisibility; override;
    function GetName: string; override;
    function GetHandle: Pointer; override;
  public
    constructor Create(AParent: TRttiType; APropInfo: PPropInfo);
    function GetValue(Instance: pointer): TValue;
    procedure SetValue(Instance: pointer; const AValue: TValue);
    property PropertyType: TRttiType read GetPropertyType;
    property IsReadable: boolean read GetIsReadable;
    property IsWritable: boolean read GetIsWritable;
    property Visibility: TMemberVisibility read GetVisibility;
  end;

  TRttiParameter = class(TRttiNamedObject)
  private
    FString: String;
  protected
    function GetParamType: TRttiType; virtual; abstract;
    function GetFlags: TParamFlags; virtual; abstract;
  public
    property ParamType: TRttiType read GetParamType;
    property Flags: TParamFlags read GetFlags;
    function ToString: String; override;
  end;

  TMethodImplementationCallbackMethod = procedure(aUserData: Pointer; const aArgs: TValueArray; out aResult: TValue) of object;
  TMethodImplementationCallbackProc = procedure(aUserData: Pointer; const aArgs: TValueArray; out aResult: TValue);

  TMethodImplementation = class
  private
    fLowLevelCallback: TFunctionCallCallback;
    fCallbackProc: TMethodImplementationCallbackProc;
    fCallbackMethod: TMethodImplementationCallbackMethod;
    fArgs: specialize TArray<TFunctionCallParameterInfo>;
    fArgLen: SizeInt;
    fRefArgs: specialize TArray<SizeInt>;
    fFlags: TFunctionCallFlags;
    fResult: PTypeInfo;
    fCC: TCallConv;
    function GetCodeAddress: CodePointer;
    procedure InitArgs;
    procedure HandleCallback(const aArgs: specialize TArray<Pointer>; aResult: Pointer; aContext: Pointer);
    constructor Create(aCC: TCallConv; aArgs: specialize TArray<TFunctionCallParameterInfo>; aResult: PTypeInfo; aFlags: TFunctionCallFlags; aUserData: Pointer; aCallback: TMethodImplementationCallbackMethod);
    constructor Create(aCC: TCallConv; aArgs: specialize TArray<TFunctionCallParameterInfo>; aResult: PTypeInfo; aFlags: TFunctionCallFlags; aUserData: Pointer; aCallback: TMethodImplementationCallbackProc);
  public
    constructor Create;
    destructor Destroy; override;
    property CodeAddress: CodePointer read GetCodeAddress;
  end;

  TRttiInvokableType = class(TRttiType)
  protected
    function GetParameters(aWithHidden: Boolean): specialize TArray<TRttiParameter>; virtual; abstract;
    function GetCallingConvention: TCallConv; virtual; abstract;
    function GetReturnType: TRttiType; virtual; abstract;
    function GetFlags: TFunctionCallFlags; virtual; abstract;
  public type
    TCallbackMethod = procedure(aInvokable: TRttiInvokableType; const aArgs: TValueArray; out aResult: TValue) of object;
    TCallbackProc = procedure(aInvokable: TRttiInvokableType; const aArgs: TValueArray; out aResult: TValue);
  public
    function GetParameters: specialize TArray<TRttiParameter>; inline;
    property CallingConvention: TCallConv read GetCallingConvention;
    property ReturnType: TRttiType read GetReturnType;
    function Invoke(const aProcOrMeth: TValue; const aArgs: array of TValue): TValue; virtual; abstract;
    { Note: once "reference to" is supported these will be replaced by a single method }
    function CreateImplementation(aCallback: TCallbackMethod): TMethodImplementation;
    function CreateImplementation(aCallback: TCallbackProc): TMethodImplementation;
  end;

  TRttiMethodType = class(TRttiInvokableType)
  private
    FCallConv: TCallConv;
    FReturnType: TRttiType;
    FParams, FParamsAll: specialize TArray<TRttiParameter>;
  protected
    function GetParameters(aWithHidden: Boolean): specialize TArray<TRttiParameter>; override;
    function GetCallingConvention: TCallConv; override;
    function GetReturnType: TRttiType; override;
    function GetFlags: TFunctionCallFlags; override;
  public
    function Invoke(const aCallable: TValue; const aArgs: array of TValue): TValue; override;
  end;

  TRttiProcedureType = class(TRttiInvokableType)
  private
    FParams, FParamsAll: specialize TArray<TRttiParameter>;
  protected
    function GetParameters(aWithHidden: Boolean): specialize TArray<TRttiParameter>; override;
    function GetCallingConvention: TCallConv; override;
    function GetReturnType: TRttiType; override;
    function GetFlags: TFunctionCallFlags; override;
  public
    function Invoke(const aCallable: TValue; const aArgs: array of TValue): TValue; override;
  end;

  TDispatchKind = (
    dkStatic,
    dkVtable,
    dkDynamic,
    dkMessage,
    dkInterface,
    { the following are FPC-only and will be moved should Delphi add more }
    dkMessageString
  );

  TRttiMethod = class(TRttiMember)
  private
    FString: String;
    function GetFlags: TFunctionCallFlags;
  protected
    function GetCallingConvention: TCallConv; virtual; abstract;
    function GetCodeAddress: CodePointer; virtual; abstract;
    function GetDispatchKind: TDispatchKind; virtual; abstract;
    function GetHasExtendedInfo: Boolean; virtual;
    function GetIsClassMethod: Boolean; virtual; abstract;
    function GetIsConstructor: Boolean; virtual; abstract;
    function GetIsDestructor: Boolean; virtual; abstract;
    function GetIsStatic: Boolean; virtual; abstract;
    function GetMethodKind: TMethodKind; virtual; abstract;
    function GetReturnType: TRttiType; virtual; abstract;
    function GetVirtualIndex: SmallInt; virtual; abstract;
    function GetParameters(aWithHidden: Boolean): specialize TArray<TRttiParameter>; virtual; abstract;
  public
    property CallingConvention: TCallConv read GetCallingConvention;
    property CodeAddress: CodePointer read GetCodeAddress;
    property DispatchKind: TDispatchKind read GetDispatchKind;
    property HasExtendedInfo: Boolean read GetHasExtendedInfo;
    property IsClassMethod: Boolean read GetIsClassMethod;
    property IsConstructor: Boolean read GetIsConstructor;
    property IsDestructor: Boolean read GetIsDestructor;
    property IsStatic: Boolean read GetIsStatic;
    property MethodKind: TMethodKind read GetMethodKind;
    property ReturnType: TRttiType read GetReturnType;
    property VirtualIndex: SmallInt read GetVirtualIndex;
    function ToString: String; override;
    function GetParameters: specialize TArray<TRttiParameter>; inline;
    function Invoke(aInstance: TObject; const aArgs: array of TValue): TValue;
    function Invoke(aInstance: TClass; const aArgs: array of TValue): TValue;
    function Invoke(aInstance: TValue; const aArgs: array of TValue): TValue;
    { Note: once "reference to" is supported these will be replaced by a single method }
    function CreateImplementation(aUserData: Pointer; aCallback: TMethodImplementationCallbackMethod): TMethodImplementation;
    function CreateImplementation(aUserData: Pointer; aCallback: TMethodImplementationCallbackProc): TMethodImplementation;
  end;

  TRttiStructuredType = class(TRttiType)

  end;

  TInterfaceType = (
    itRefCounted, { aka COM interface }
    itRaw         { aka CORBA interface }
  );

  TRttiInterfaceType = class(TRttiType)
  private
    fDeclaredMethods: specialize TArray<TRttiMethod>;
  protected
    function IntfMethodCount: Word;
    function MethodTable: PIntfMethodTable; virtual; abstract;
    function GetBaseType: TRttiType; override;
    function GetIntfBaseType: TRttiInterfaceType; virtual; abstract;
    function GetDeclaringUnitName: String; virtual; abstract;
    function GetGUID: TGUID; virtual; abstract;
    function GetGUIDStr: String; virtual;
    function GetIntfFlags: TIntfFlags; virtual; abstract;
    function GetIntfType: TInterfaceType; virtual; abstract;
  public
    property BaseType: TRttiInterfaceType read GetIntfBaseType;
    property DeclaringUnitName: String read GetDeclaringUnitName;
    property GUID: TGUID read GetGUID;
    property GUIDStr: String read GetGUIDStr;
    property IntfFlags: TIntfFlags read GetIntfFlags;
    property IntfType: TInterfaceType read GetIntfType;
    function GetDeclaredMethods: specialize TArray<TRttiMethod>; override;
  end;

  { TRttiInstanceType }

  TRttiInstanceType = class(TRttiStructuredType)
  private
    FPropertiesResolved: Boolean;
    FProperties: specialize TArray<TRttiProperty>;
    function GetDeclaringUnitName: string;
    function GetMetaClassType: TClass;
  protected
    function GetIsInstance: boolean; override;
    function GetTypeSize: integer; override;
    function GetBaseType: TRttiType; override;
  public
    function GetProperties: specialize TArray<TRttiProperty>; override;
    property MetaClassType: TClass read GetMetaClassType;
    property DeclaringUnitName: string read GetDeclaringUnitName;
  end;

  TVirtualInterfaceInvokeEvent = procedure(aMethod: TRttiMethod; const aArgs: TValueArray; out aResult: TValue) of object;

  TVirtualInterface = class(TInterfacedObject, IInterface)
  private
    fGUID: TGUID;
    fOnInvoke: TVirtualInterfaceInvokeEvent;
    fContext: TRttiContext;
    fImpls: array of TMethodImplementation;
    fVmt: PCodePointer;
    fQueryInterfaceType: TRttiType;
    fAddRefType: TRttiType;
    fReleaseType: TRttiType;
  protected
    function QueryInterface(constref aIID: TGuid; out aObj): LongInt;{$IFNDEF WINDOWS}cdecl{$ELSE}stdcall{$ENDIF};

    procedure HandleIInterfaceCallback(aInvokable: TRttiInvokableType; const aArgs: TValueArray; out aResult: TValue);
    procedure HandleUserCallback(aUserData: Pointer; const aArgs: TValueArray; out aResult: TValue);
  public
    constructor Create(aPIID: PTypeInfo);
    constructor Create(aPIID: PTypeInfo; aInvokeEvent: TVirtualInterfaceInvokeEvent);
    destructor Destroy; override;
    property OnInvoke: TVirtualInterfaceInvokeEvent read fOnInvoke write fOnInvoke;
  end;


  ERtti = class(Exception);
  EInsufficientRtti = class(ERtti);
  EInvocationError = class(ERtti);
  ENonPublicType = class(ERtti);

  TFunctionCallParameter = record
    ValueRef: Pointer;
    ValueSize: SizeInt;
    Info: TFunctionCallParameterInfo;
  end;
  TFunctionCallParameterArray = specialize TArray<TFunctionCallParameter>;

  TFunctionCallProc = procedure(const aArgs: specialize TArray<Pointer>; aResult: Pointer; aContext: Pointer);
  TFunctionCallMethod = procedure(const aArgs: specialize TArray<Pointer>; aResult: Pointer; aContext: Pointer) of object;

  TFunctionCallManager = record
    Invoke: procedure(CodeAddress: CodePointer; const Args: TFunctionCallParameterArray; CallingConvention: TCallConv;
              ResultType: PTypeInfo; ResultValue: Pointer; Flags: TFunctionCallFlags);
    CreateCallbackProc: function(aHandler: TFunctionCallProc; aCallConv: TCallConv; aArgs: array of TFunctionCallParameterInfo; aResultType: PTypeInfo; aFlags: TFunctionCallFlags; aContext: Pointer): TFunctionCallCallback;
    CreateCallbackMethod: function(aHandler: TFunctionCallMethod; aCallConv: TCallConv; aArgs: array of TFunctionCallParameterInfo; aResultType: PTypeInfo; aFlags: TFunctionCallFlags; aContext: Pointer): TFunctionCallCallback;
  end;
  TFunctionCallManagerArray = array[TCallConv] of TFunctionCallManager;

  TCallConvSet = set of TCallConv;

procedure SetFunctionCallManager(aCallConv: TCallConv; constref aFuncCallMgr: TFunctionCallManager; out aOldFuncCallMgr: TFunctionCallManager);
procedure SetFunctionCallManager(aCallConv: TCallConv; constref aFuncCallMgr: TFunctionCallManager);
procedure SetFunctionCallManager(aCallConvs: TCallConvSet; constref aFuncCallMgr: TFunctionCallManager; out aOldFuncCallMgrs: TFunctionCallManagerArray);
procedure SetFunctionCallManager(aCallConvs: TCallConvSet; constref aFuncCallMgr: TFunctionCallManager);
procedure SetFunctionCallManagers(aCallConvs: TCallConvSet; constref aFuncCallMgrs: TFunctionCallManagerArray; out aOldFuncCallMgrs: TFunctionCallManagerArray);
procedure SetFunctionCallManagers(aCallConvs: TCallConvSet; constref aFuncCallMgrs: TFunctionCallManagerArray);
procedure SetFunctionCallManagers(constref aFuncCallMgrs: TFunctionCallManagerArray; out aOldFuncCallMgrs: TFunctionCallManagerArray);
procedure SetFunctionCallManagers(constref aFuncCallMgrs: TFunctionCallManagerArray);
procedure GetFunctionCallManager(aCallConv: TCallConv; out aFuncCallMgr: TFunctionCallManager);
procedure GetFunctionCallManagers(aCallConvs: TCallConvSet; out aFuncCallMgrs: TFunctionCallManagerArray);
procedure GetFunctionCallManagers(out aFuncCallMgrs: TFunctionCallManagerArray);

function Invoke(aCodeAddress: CodePointer; const aArgs: TValueArray; aCallConv: TCallConv;
  aResultType: PTypeInfo; aIsStatic: Boolean; aIsConstructor: Boolean): TValue;

function CreateCallbackProc(aHandler: TFunctionCallProc; aCallConv: TCallConv; aArgs: array of TFunctionCallParameterInfo; aResultType: PTypeInfo; aFlags: TFunctionCallFlags; aContext: Pointer): TFunctionCallCallback;
function CreateCallbackMethod(aHandler: TFunctionCallMethod; aCallConv: TCallConv; aArgs: array of TFunctionCallParameterInfo; aResultType: PTypeInfo; aFlags: TFunctionCallFlags; aContext: Pointer): TFunctionCallCallback;

function IsManaged(TypeInfo: PTypeInfo): boolean;

{$ifndef InLazIDE}
generic function OpenArrayToDynArrayValue<T>(constref aArray: array of T): TValue;
{$endif}

{ these resource strings are needed by units implementing function call managers }
resourcestring
  SErrInvokeNotImplemented = 'Invoke functionality is not implemented';
  SErrInvokeResultTypeNoValue = 'Function has a result type, but no result pointer provided';
  SErrInvokeFailed = 'Invoke call failed';
  SErrMethodImplCreateFailed  = 'Failed to create method implementation';
  SErrCallbackNotImplemented = 'Callback functionality is not implemented';
  SErrCallConvNotSupported = 'Calling convention not supported: %s';
  SErrTypeKindNotSupported = 'Type kind is not supported: %s';
  SErrCallbackHandlerNil = 'Callback handler is Nil';
  SErrMissingSelfParam = 'Missing self parameter';

implementation

uses
{$ifdef windows}
  Windows,
{$endif}
{$ifdef unix}
  BaseUnix,
{$endif}
  fgl;

type

  { TRttiPool }

  TRttiPool = class
  private type
    TRttiObjectMap = specialize TFPGMap<Pointer, TRttiObject>;
  private
    FObjectMap: TRttiObjectMap;
    FTypesList: specialize TArray<TRttiType>;
    FTypeCount: LongInt;
    FLock: TRTLCriticalSection;
  public
    function GetTypes: specialize TArray<TRttiType>;
    function GetType(ATypeInfo: PTypeInfo): TRttiType;
    function GetByHandle(aHandle: Pointer): TRttiObject;
    procedure AddObject(aObject: TRttiObject);
    constructor Create;
    destructor Destroy; override;
  end;

  IPooltoken = interface
  ['{3CDB3CE9-AB55-CBAA-7B9D-2F3BB1CF5AF8}']
    function RttiPool: TRttiPool;
  end;

  { TPoolToken }

  TPoolToken = class(TInterfacedObject, IPooltoken)
  public
    constructor Create;
    destructor Destroy; override;
    function RttiPool: TRttiPool;
  end;

  { TValueDataIntImpl }

  TValueDataIntImpl = class(TInterfacedObject, IValueData)
  private
    FBuffer: Pointer;
    FDataSize: SizeInt;
    FTypeInfo: PTypeInfo;
    FIsCopy: Boolean;
    FUseAddRef: Boolean;
  public
    constructor CreateCopy(ACopyFromBuffer: Pointer; ALen: SizeInt; ATypeInfo: PTypeInfo; AAddRef: Boolean);
    constructor CreateRef(AData: Pointer; ATypeInfo: PTypeInfo; AAddRef: Boolean);
    destructor Destroy; override;
    procedure ExtractRawData(ABuffer: pointer);
    procedure ExtractRawDataNoCopy(ABuffer: pointer);
    function GetDataSize: SizeInt;
    function GetReferenceToRawData: pointer;
  end;

  TRttiRefCountedInterfaceType = class(TRttiInterfaceType)
  private
    function IntfData: PInterfaceData; inline;
  protected
    function MethodTable: PIntfMethodTable; override;
    function GetIntfBaseType: TRttiInterfaceType; override;
    function GetDeclaringUnitName: String; override;
    function GetGUID: TGUID; override;
    function GetIntfFlags: TIntfFlags; override;
    function GetIntfType: TInterfaceType; override;
  end;

  TRttiRawInterfaceType = class(TRttiInterfaceType)
  private
    function IntfData: PInterfaceRawData; inline;
  protected
    function MethodTable: PIntfMethodTable; override;
    function GetIntfBaseType: TRttiInterfaceType; override;
    function GetDeclaringUnitName: String; override;
    function GetGUID: TGUID; override;
    function GetGUIDStr: String; override;
    function GetIntfFlags: TIntfFlags; override;
    function GetIntfType: TInterfaceType; override;
  end;

  TRttiVmtMethodParameter = class(TRttiParameter)
  private
    FVmtMethodParam: PVmtMethodParam;
  protected
    function GetHandle: Pointer; override;
    function GetName: String; override;
    function GetFlags: TParamFlags; override;
    function GetParamType: TRttiType; override;
  public
    constructor Create(AVmtMethodParam: PVmtMethodParam);
  end;

  TRttiMethodTypeParameter = class(TRttiParameter)
  private
    fHandle: Pointer;
    fName: String;
    fFlags: TParamFlags;
    fType: PTypeInfo;
  protected
    function GetHandle: Pointer; override;
    function GetName: String; override;
    function GetFlags: TParamFlags; override;
    function GetParamType: TRttiType; override;
  public
    constructor Create(aHandle: Pointer; const aName: String; aFlags: TParamFlags; aType: PTypeInfo);
  end;

  TRttiIntfMethod = class(TRttiMethod)
  private
    FIntfMethodEntry: PIntfMethodEntry;
    FIndex: SmallInt;
    FParams, FParamsAll: specialize TArray<TRttiParameter>;
  protected
    function GetHandle: Pointer; override;
    function GetName: String; override;
    function GetCallingConvention: TCallConv; override;
    function GetCodeAddress: CodePointer; override;
    function GetDispatchKind: TDispatchKind; override;
    function GetHasExtendedInfo: Boolean; override;
    function GetIsClassMethod: Boolean; override;
    function GetIsConstructor: Boolean; override;
    function GetIsDestructor: Boolean; override;
    function GetIsStatic: Boolean; override;
    function GetMethodKind: TMethodKind; override;
    function GetReturnType: TRttiType; override;
    function GetVirtualIndex: SmallInt; override;
    function GetParameters(aWithHidden: Boolean): specialize TArray<TRttiParameter>; override;
  public
    constructor Create(AParent: TRttiType; AIntfMethodEntry: PIntfMethodEntry; AIndex: SmallInt);
  end;

resourcestring
  SErrUnableToGetValueForType = 'Unable to get value for type %s';
  SErrUnableToSetValueForType = 'Unable to set value for type %s';
  SErrInvalidTypecast         = 'Invalid class typecast';
  SErrRttiObjectNoHandle      = 'RTTI object instance has no valid handle property';
  SErrRttiObjectAlreadyRegistered = 'A RTTI object with handle 0x%x is already registered';
  SErrInvokeInsufficientRtti  = 'Insufficient RTTI to invoke function';
  SErrInvokeStaticNoSelf      = 'Static function must not be called with in an instance: %s';
  SErrInvokeNotStaticNeedsSelf = 'Non static function must be called with an instance: %s';
  SErrInvokeClassMethodClassSelf = 'Class method needs to be called with a class type: %s';
  SErrInvokeArrayArgExpected  = 'Array argument expected for parameter %s of method %s';
  SErrInvokeArgInvalidType    = 'Invalid type of argument for parameter %s of method %s';
  SErrInvokeArgCount          = 'Invalid argument count for method %s; expected %d, but got %d';
  SErrInvokeNoCodeAddr        = 'Failed to determine code address for method: %s';
  SErrInvokeRttiDataError     = 'The RTTI data is inconsistent for method: %s';
  SErrInvokeCallableNotProc   = 'The callable value is not a procedure variable for: %s';
  SErrInvokeCallableNotMethod = 'The callable value is not a method variable for: %s';
  SErrMethodImplNoCallback    = 'No callback specified for method implementation';
  SErrMethodImplInsufficientRtti = 'Insufficient RTTI to create method implementation';
  SErrMethodImplCreateNoArg   = 'TMethodImplementation can not be created this way';
  SErrVirtIntfTypeNil = 'No type information provided for TVirtualInterface';
  SErrVirtIntfTypeMustBeIntf = 'Type ''%s'' is not an interface type';
  SErrVirtIntfTypeNotFound = 'Type ''%s'' is not valid';
  SErrVirtIntfNotAllMethodsRTTI = 'Not all methods of ''%s'' or its parents have the required RTTI';
  SErrVirtIntfRetrieveIInterface = 'Failed to retrieve IInterface information';
  SErrVirtIntfCreateImpl = 'Failed to create implementation for method ''%1:s'' of ''%0:s''';
  SErrVirtIntfInvalidVirtIdx = 'Virtual index %2:d for method ''%1:s'' of ''%0:s'' is invalid';
  SErrVirtIntfMethodNil = 'Method %1:d of ''%0:s'' is Nil';
  SErrVirtIntfCreateVmt = 'Failed to create VMT for ''%s''';
  SErrVirtIntfIInterface = 'Failed to prepare IInterface method callbacks';

var
  PoolRefCount : integer;
  GRttiPool    : TRttiPool;
  FuncCallMgr: TFunctionCallManagerArray;

function AllocateMemory(aSize: PtrUInt): Pointer;
begin
{$IF DEFINED(WINDOWS)}
  Result := VirtualAlloc(Nil, aSize, MEM_RESERVE or MEM_COMMIT, PAGE_READWRITE);
{$ELSEIF DEFINED(UNIX)}
  Result := fpmmap(Nil, aSize, PROT_READ or PROT_WRITE, MAP_PRIVATE or MAP_ANONYMOUS, 0, 0);
{$ELSE}
  Result := Nil;
{$ENDIF}
end;

function ProtectMemory(aPtr: Pointer; aSize: PtrUInt; aExecutable: Boolean): Boolean;
{$IF DEFINED(WINDOWS)}
var
  oldprot: DWORD;
{$ENDIF}
begin
{$IF DEFINED(WINDOWS)}
  if aExecutable then
    Result := VirtualProtect(aPtr, aSize, PAGE_EXECUTE_READ, oldprot)
  else
    Result := VirtualProtect(aPtr, aSize, PAGE_READWRITE, oldprot);
{$ELSEIF DEFINED(UNIX)}
  if aExecutable then
    Result := Fpmprotect(aPtr, aSize, PROT_EXEC or PROT_READ) = 0
  else
    Result := Fpmprotect(aPtr, aSize, PROT_READ or PROT_WRITE) = 0;
{$ELSE}
  Result := False;
{$ENDIF}
end;

procedure FreeMemory(aPtr: Pointer; aSize: PtrUInt);
begin
{$IF DEFINED(WINDOWS)}
  VirtualFree(aPtr, 0, MEM_RELEASE);
{$ELSEIF DEFINED(UNIX)}
  fpmunmap(aPtr, aSize);
{$ELSE}
  { nothing }
{$ENDIF}
end;

function CCToStr(aCC: TCallConv): String; inline;
begin
  WriteStr(Result, aCC);
end;

procedure NoInvoke(aCodeAddress: CodePointer; const aArgs: TFunctionCallParameterArray; aCallConv: TCallConv;
            aResultType: PTypeInfo; aResultValue: Pointer; aFlags: TFunctionCallFlags);
begin
  raise ENotImplemented.Create(SErrInvokeNotImplemented);
end;

function NoCreateCallbackProc(aFunc: TFunctionCallProc; aCallConv: TCallConv; aArgs: array of TFunctionCallParameterInfo; aResultType: PTypeInfo; aFlags: TFunctionCallFlags; aContext: Pointer): TFunctionCallCallback;
begin
  Result := Nil;
  raise ENotImplemented.Create(SErrCallbackNotImplemented);
end;

function NoCreateCallbackMethod(aFunc: TFunctionCallMethod; aCallConv: TCallConv; aArgs: array of TFunctionCallParameterInfo; aResultType: PTypeInfo; aFlags: TFunctionCallFlags; aContext: Pointer): TFunctionCallCallback;
begin
  Result := Nil;
  raise ENotImplemented.Create(SErrCallbackNotImplemented);
end;

const
  NoFunctionCallManager: TFunctionCallManager = (
    Invoke: @NoInvoke;
    CreateCallbackProc: @NoCreateCallbackProc;
    CreateCallbackMethod: @NoCreateCallbackMethod;
  );

procedure SetFunctionCallManager(aCallConv: TCallConv; constref aFuncCallMgr: TFunctionCallManager;
  out aOldFuncCallMgr: TFunctionCallManager);
begin
  aOldFuncCallMgr := FuncCallMgr[aCallConv];
  FuncCallMgr[aCallConv] := aFuncCallMgr;
end;

procedure SetFunctionCallManager(aCallConv: TCallConv; constref aFuncCallMgr: TFunctionCallManager);
var
  dummy: TFunctionCallManager;
begin
  SetFunctionCallManager(aCallConv, aFuncCallMgr, dummy);
end;

procedure SetFunctionCallManager(aCallConvs: TCallConvSet; constref aFuncCallMgr: TFunctionCallManager;
  out aOldFuncCallMgrs: TFunctionCallManagerArray);
var
  cc: TCallConv;
begin
  for cc := Low(TCallConv) to High(TCallConv) do
    if cc in aCallConvs then begin
      aOldFuncCallMgrs[cc] := FuncCallMgr[cc];
      FuncCallMgr[cc] := aFuncCallMgr;
    end else
      aOldFuncCallMgrs[cc] := Default(TFunctionCallManager);
end;

procedure SetFunctionCallManager(aCallConvs: TCallConvSet; constref aFuncCallMgr: TFunctionCallManager);
var
  dummy: TFunctionCallManagerArray;
begin
  SetFunctionCallManager(aCallConvs, aFuncCallMgr, dummy);
end;

procedure SetFunctionCallManagers(aCallConvs: TCallConvSet; constref aFuncCallMgrs: TFunctionCallManagerArray; out aOldFuncCallMgrs: TFunctionCallManagerArray);
var
  cc: TCallConv;
begin
  for cc := Low(TCallConv) to High(TCallConv) do
    if cc in aCallConvs then begin
      aOldFuncCallMgrs[cc] := FuncCallMgr[cc];
      FuncCallMgr[cc] := aFuncCallMgrs[cc];
    end else
      aOldFuncCallMgrs[cc] := Default(TFunctionCallManager);
end;

procedure SetFunctionCallManagers(aCallConvs: TCallConvSet; constref aFuncCallMgrs: TFunctionCallManagerArray);
var
  dummy: TFunctionCallManagerArray;
begin
  SetFunctionCallManagers(aCallConvs, aFuncCallMgrs, dummy);
end;

procedure SetFunctionCallManagers(constref aFuncCallMgrs: TFunctionCallManagerArray; out aOldFuncCallMgrs: TFunctionCallManagerArray);
begin
  aOldFuncCallMgrs := FuncCallMgr;
  FuncCallMgr := aFuncCallMgrs;
end;

procedure SetFunctionCallManagers(constref aFuncCallMgrs: TFunctionCallManagerArray);
var
  dummy: TFunctionCallManagerArray;
begin
  SetFunctionCallManagers(aFuncCallMgrs, dummy);
end;

procedure GetFunctionCallManager(aCallConv: TCallConv; out aFuncCallMgr: TFunctionCallManager);
begin
  aFuncCallMgr := FuncCallMgr[aCallConv];
end;

procedure GetFunctionCallManagers(aCallConvs: TCallConvSet; out aFuncCallMgrs: TFunctionCallManagerArray);
var
  cc: TCallConv;
begin
  for cc := Low(TCallConv) to High(TCallConv) do
    if cc in aCallConvs then
      aFuncCallMgrs[cc] := FuncCallMgr[cc]
    else
      aFuncCallMgrs[cc] := Default(TFunctionCallManager);
end;

procedure GetFunctionCallManagers(out aFuncCallMgrs: TFunctionCallManagerArray);
begin
  aFuncCallMgrs := FuncCallMgr;
end;

procedure InitDefaultFunctionCallManager;
var
  cc: TCallConv;
begin
  for cc := Low(TCallConv) to High(TCallConv) do
    FuncCallMgr[cc] := NoFunctionCallManager;
end;

{ TRttiPool }

function TRttiPool.GetTypes: specialize TArray<TRttiType>;
begin
  if not Assigned(FTypesList) then
    Exit(Nil);
{$ifdef FPC_HAS_FEATURE_THREADING}
  EnterCriticalsection(FLock);
  try
{$endif}
    Result := Copy(FTypesList, 0, FTypeCount);
{$ifdef FPC_HAS_FEATURE_THREADING}
  finally
    LeaveCriticalsection(FLock);
  end;
{$endif}
end;

function TRttiPool.GetType(ATypeInfo: PTypeInfo): TRttiType;
var
  obj: TRttiObject;
begin
  if not Assigned(ATypeInfo) then
    Exit(Nil);
{$ifdef FPC_HAS_FEATURE_THREADING}
  EnterCriticalsection(FLock);
  try
{$endif}
    Result := Nil;
    obj := GetByHandle(ATypeInfo);
    if Assigned(obj) then
      Result := obj as TRttiType;
    if not Assigned(Result) then
      begin
        if FTypeCount = Length(FTypesList) then
          begin
            SetLength(FTypesList, FTypeCount * 2);
          end;
        case ATypeInfo^.Kind of
          tkClass   : Result := TRttiInstanceType.Create(ATypeInfo);
          tkInterface: Result := TRttiRefCountedInterfaceType.Create(ATypeInfo);
          tkInterfaceRaw: Result := TRttiRawInterfaceType.Create(ATypeInfo);
          tkSString,
          tkLString,
          tkAString,
          tkUString,
          tkWString : Result := TRttiStringType.Create(ATypeInfo);
          tkFloat   : Result := TRttiFloatType.Create(ATypeInfo);
          tkPointer : Result := TRttiPointerType.Create(ATypeInfo);
          tkProcVar : Result := TRttiProcedureType.Create(ATypeInfo);
          tkMethod  : Result := TRttiMethodType.Create(ATypeInfo);
        else
          Result := TRttiType.Create(ATypeInfo);
        end;
        FTypesList[FTypeCount] := Result;
        FObjectMap.Add(ATypeInfo, Result);
        Inc(FTypeCount);
      end;
{$ifdef FPC_HAS_FEATURE_THREADING}
  finally
    LeaveCriticalsection(FLock);
  end;
{$endif}
end;

function TRttiPool.GetByHandle(aHandle: Pointer): TRttiObject;
var
  idx: LongInt;
begin
  if not Assigned(aHandle) then
    Exit(Nil);
{$ifdef FPC_HAS_FEATURE_THREADING}
  EnterCriticalsection(FLock);
  try
{$endif}
    idx := FObjectMap.IndexOf(aHandle);
    if idx < 0 then
      Result := Nil
    else
      Result := FObjectMap.Data[idx];
{$ifdef FPC_HAS_FEATURE_THREADING}
  finally
    LeaveCriticalsection(FLock);
  end;
{$endif}
end;

procedure TRttiPool.AddObject(aObject: TRttiObject);
var
  idx: LongInt;
begin
  if not Assigned(aObject) then
    Exit;
  if not Assigned(aObject.Handle) then
    raise EArgumentException.Create(SErrRttiObjectNoHandle);
{$ifdef FPC_HAS_FEATURE_THREADING}
  EnterCriticalsection(FLock);
  try
{$endif}
    idx := FObjectMap.IndexOf(aObject.Handle);
    if idx < 0 then
      FObjectMap.Add(aObject.Handle, aObject)
    else if FObjectMap.Data[idx] <> aObject then
      raise EInvalidOpException.CreateFmt(SErrRttiObjectAlreadyRegistered, [aObject.Handle]);
{$ifdef FPC_HAS_FEATURE_THREADING}
  finally
    LeaveCriticalsection(FLock);
  end;
{$endif}
end;

constructor TRttiPool.Create;
begin
{$ifdef FPC_HAS_FEATURE_THREADING}
  InitCriticalSection(FLock);
{$endif}
  SetLength(FTypesList, 32);
  FObjectMap := TRttiObjectMap.Create;
end;

destructor TRttiPool.Destroy;
var
  i: LongInt;
begin
  for i := 0 to FObjectMap.Count - 1 do
    FObjectMap.Data[i].Free;
  FObjectMap.Free;
{$ifdef FPC_HAS_FEATURE_THREADING}
  DoneCriticalsection(FLock);
{$endif}
  inherited Destroy;
end;

{ TPoolToken }

constructor TPoolToken.Create;
begin
  inherited Create;
  if InterlockedIncrement(PoolRefCount)=1 then
    GRttiPool := TRttiPool.Create;
end;

destructor TPoolToken.Destroy;
begin
  if InterlockedDecrement(PoolRefCount)=0 then
    GRttiPool.Free;
  inherited;
end;

function TPoolToken.RttiPool: TRttiPool;
begin
  result := GRttiPool;
end;

{ TValueDataIntImpl }

procedure IntFinalize(APointer, ATypeInfo: Pointer);
  external name 'FPC_FINALIZE';
procedure IntInitialize(APointer, ATypeInfo: Pointer);
  external name 'FPC_INITIALIZE';
procedure IntAddRef(APointer, ATypeInfo: Pointer);
  external name 'FPC_ADDREF';
function IntCopy(ASource, ADest, ATypeInfo: Pointer): SizeInt;
  external name 'FPC_COPY';

constructor TValueDataIntImpl.CreateCopy(ACopyFromBuffer: Pointer; ALen: SizeInt; ATypeInfo: PTypeInfo; AAddRef: Boolean);
begin
  FTypeInfo := ATypeInfo;
  FDataSize:=ALen;
  if ALen>0 then
    begin
      Getmem(FBuffer,FDataSize);
      if Assigned(ACopyFromBuffer) then
        system.move(ACopyFromBuffer^,FBuffer^,FDataSize)
      else
        FillChar(FBuffer^, FDataSize, 0);
    end;
  FIsCopy := True;
  FUseAddRef := AAddRef;
  if AAddRef and (ALen > 0) then begin
    if Assigned(ACopyFromBuffer) then
      IntAddRef(FBuffer, FTypeInfo)
    else
      IntInitialize(FBuffer, FTypeInfo);
  end;
end;

constructor TValueDataIntImpl.CreateRef(AData: Pointer; ATypeInfo: PTypeInfo; AAddRef: Boolean);
begin
  FTypeInfo := ATypeInfo;
  FDataSize := SizeOf(Pointer);
  if Assigned(AData) then
    FBuffer := PPointer(AData)^
  else
    FBuffer := Nil;
  FIsCopy := False;
  FUseAddRef := AAddRef;
  if AAddRef and Assigned(AData) then
    IntAddRef(@FBuffer, FTypeInfo);
end;

destructor TValueDataIntImpl.Destroy;
begin
  if Assigned(FBuffer) then begin
    if FUseAddRef then
      if FIsCopy then
        IntFinalize(FBuffer, FTypeInfo)
      else
        IntFinalize(@FBuffer, FTypeInfo);
    if FIsCopy then
      Freemem(FBuffer);
  end;
  inherited Destroy;
end;

procedure TValueDataIntImpl.ExtractRawData(ABuffer: pointer);
begin
  if FDataSize = 0 then
    Exit;
  if FIsCopy then
    System.Move(FBuffer^, ABuffer^, FDataSize)
  else
    System.Move(FBuffer{!}, ABuffer^, FDataSize);
  if FUseAddRef then
    IntAddRef(ABuffer, FTypeInfo);
end;

procedure TValueDataIntImpl.ExtractRawDataNoCopy(ABuffer: pointer);
begin
  if FDataSize = 0 then
    Exit;
  if FIsCopy then
    system.move(FBuffer^, ABuffer^, FDataSize)
  else
    System.Move(FBuffer{!}, ABuffer^, FDataSize);
end;

function TValueDataIntImpl.GetDataSize: SizeInt;
begin
  result := FDataSize;
end;

function TValueDataIntImpl.GetReferenceToRawData: pointer;
begin
  if FIsCopy then
    result := FBuffer
  else
    result := @FBuffer;
end;

{ TValue }

class function TValue.Empty: TValue;
begin
  result.FData.FTypeInfo := nil;
{$if SizeOf(TMethod) > SizeOf(QWord)}
  Result.FData.FAsMethod.Code := Nil;
  Result.FData.FAsMethod.Data := Nil;
{$else}
  Result.FData.FAsUInt64 := 0;
{$endif}
end;

function TValue.GetTypeDataProp: PTypeData;
begin
  result := GetTypeData(FData.FTypeInfo);
end;

function TValue.GetTypeInfo: PTypeInfo;
begin
  result := FData.FTypeInfo;
end;

function TValue.GetTypeKind: TTypeKind;
begin
  if not Assigned(FData.FTypeInfo) then
    Result := tkUnknown
  else
    result := FData.FTypeInfo^.Kind;
end;

function TValue.GetDataSize: SizeInt;
begin
  if Assigned(FData.FValueData) and (Kind <> tkSString) then
    Result := FData.FValueData.GetDataSize
  else begin
    Result := 0;
    case Kind of
      tkEnumeration,
      tkBool,
      tkInt64,
      tkQWord,
      tkInteger:
        case TypeData^.OrdType of
          otSByte,
          otUByte:
            Result := SizeOf(Byte);
          otSWord,
          otUWord:
            Result := SizeOf(Word);
          otSLong,
          otULong:
            Result := SizeOf(LongWord);
          otSQWord,
          otUQWord:
            Result := SizeOf(QWord);
        end;
      tkChar:
        Result := SizeOf(AnsiChar);
      tkFloat:
        case TypeData^.FloatType of
          ftSingle:
            Result := SizeOf(Single);
          ftDouble:
            Result := SizeOf(Double);
          ftExtended:
            Result := SizeOf(Extended);
          ftComp:
            Result := SizeOf(Comp);
          ftCurr:
            Result := SizeOf(Currency);
        end;
      tkSet:
        Result := TypeData^.SetSize;
      tkMethod:
        Result := SizeOf(TMethod);
      tkSString:
        { ShortString can hold max. 254 characters as [0] is Length and [255] is #0 }
        Result := SizeOf(ShortString) - 2;
      tkVariant:
        Result := SizeOf(Variant);
      tkProcVar:
        Result := SizeOf(CodePointer);
      tkWChar:
        Result := SizeOf(WideChar);
      tkUChar:
        Result := SizeOf(UnicodeChar);
      tkFile:
        { ToDo }
        Result := SizeOf(TTextRec);
      tkAString,
      tkWString,
      tkUString,
      tkInterface,
      tkDynArray,
      tkClass,
      tkHelper,
      tkClassRef,
      tkInterfaceRaw,
      tkPointer:
        Result := SizeOf(Pointer);
      tkObject,
      tkRecord:
        Result := TypeData^.RecSize;
      tkArray:
        Result := TypeData^.ArrayData.Size;
      tkUnknown,
      tkLString:
        Assert(False);
    end;
  end;
end;

class procedure TValue.Make(ABuffer: pointer; ATypeInfo: PTypeInfo; out result: TValue);
type
  PBoolean16 = ^Boolean16;
  PBoolean32 = ^Boolean32;
  PBoolean64 = ^Boolean64;
  PByteBool = ^ByteBool;
  PQWordBool = ^QWordBool;
  PMethod = ^TMethod;
var
  td: PTypeData;
  size: SizeInt;
begin
  result.FData.FTypeInfo:=ATypeInfo;
  { resets the whole variant part; FValueData is already Nil }
{$if SizeOf(TMethod) > SizeOf(QWord)}
  Result.FData.FAsMethod.Code := Nil;
  Result.FData.FAsMethod.Data := Nil;
{$else}
  Result.FData.FAsUInt64 := 0;
{$endif}
  if not Assigned(ATypeInfo) then
    Exit;
  { first handle those types that need a TValueData implementation }
  case ATypeInfo^.Kind of
    tkSString  : begin
                   td := GetTypeData(ATypeInfo);
                   result.FData.FValueData := TValueDataIntImpl.CreateCopy(ABuffer, td^.MaxLength + 1, ATypeInfo, True);
                 end;
    tkWString,
    tkUString,
    tkAString  : result.FData.FValueData := TValueDataIntImpl.CreateRef(ABuffer, ATypeInfo, True);
    tkDynArray : result.FData.FValueData := TValueDataIntImpl.CreateRef(ABuffer, ATypeInfo, True);
    tkArray    : result.FData.FValueData := TValueDataIntImpl.CreateCopy(ABuffer, Result.TypeData^.ArrayData.Size, ATypeInfo, False);
    tkObject,
    tkRecord   : result.FData.FValueData := TValueDataIntImpl.CreateCopy(ABuffer, Result.TypeData^.RecSize, ATypeInfo, False);
    tkInterface: result.FData.FValueData := TValueDataIntImpl.CreateRef(ABuffer, ATypeInfo, True);
  end;
  if not Assigned(ABuffer) then
    Exit;
  { now handle those that are happy with the variant part of FData }
  case ATypeInfo^.Kind of
    tkSString,
    tkWString,
    tkUString,
    tkAString,
    tkDynArray,
    tkArray,
    tkObject,
    tkRecord,
    tkInterface:
      { ignore }
      ;
    tkClass    : result.FData.FAsObject := PPointer(ABuffer)^;
    tkClassRef : result.FData.FAsClass := PClass(ABuffer)^;
    tkInterfaceRaw : result.FData.FAsPointer := PPointer(ABuffer)^;
    tkInt64    : result.FData.FAsSInt64 := PInt64(ABuffer)^;
    tkQWord    : result.FData.FAsUInt64 := PQWord(ABuffer)^;
    tkProcVar  : result.FData.FAsMethod.Code := PCodePointer(ABuffer)^;
    tkMethod   : result.FData.FAsMethod := PMethod(ABuffer)^;
    tkPointer  : result.FData.FAsPointer := PPointer(ABuffer)^;
    tkSet      : begin
                   td := GetTypeData(ATypeInfo);
                   case td^.OrdType of
                     otUByte: begin
                       { this can either really be 1 Byte or a set > 32-bit, so
                         check the underlying type }
                       if not (td^.CompType^.Kind in [tkInteger,tkEnumeration]) then
                         raise Exception.CreateFmt(SErrUnableToGetValueForType,[ATypeInfo^.Name]);
                       case td^.SetSize of
                         0, 1:
                           Result.FData.FAsUByte := PByte(ABuffer)^;
                         { these two cases shouldn't happen, but better safe than sorry... }
                         2:
                           Result.FData.FAsUWord := PWord(ABuffer)^;
                         3, 4:
                           Result.FData.FAsULong := PLongWord(ABuffer)^;
                         { maybe we should also allow storage as otUQWord? }
                         5..8:
                           Result.FData.FAsUInt64 := PQWord(ABuffer)^;
                         else
                           Result.FData.FValueData := TValueDataIntImpl.CreateCopy(ABuffer, td^.SetSize, ATypeInfo, False);
                       end;
                     end;
                     otUWord:
                       Result.FData.FAsUWord := PWord(ABuffer)^;
                     otULong:
                       Result.FData.FAsULong := PLongWord(ABuffer)^;
                     else
                       { ehm... Panic? }
                       raise Exception.CreateFmt(SErrUnableToGetValueForType,[ATypeInfo^.Name]);
                   end;
                 end;
    tkEnumeration,
    tkInteger  : begin
                   case GetTypeData(ATypeInfo)^.OrdType of
                     otSByte: result.FData.FAsSByte := PShortInt(ABuffer)^;
                     otUByte: result.FData.FAsUByte := PByte(ABuffer)^;
                     otSWord: result.FData.FAsSWord := PSmallInt(ABuffer)^;
                     otUWord: result.FData.FAsUWord := PWord(ABuffer)^;
                     otSLong: result.FData.FAsSLong := PLongInt(ABuffer)^;
                     otULong: result.FData.FAsULong := PLongWord(ABuffer)^;
                   end;
                 end;
    tkBool     : begin
                   case GetTypeData(ATypeInfo)^.OrdType of
                     otUByte: result.FData.FAsUByte := Byte(System.PBoolean(ABuffer)^);
                     otUWord: result.FData.FAsUWord := Word(PBoolean16(ABuffer)^);
                     otULong: result.FData.FAsULong := DWord(PBoolean32(ABuffer)^);
                     otUQWord: result.FData.FAsUInt64 := QWord(PBoolean64(ABuffer)^);
                     otSByte: result.FData.FAsSByte := ShortInt(PByteBool(ABuffer)^);
                     otSWord: result.FData.FAsSWord := SmallInt(PWordBool(ABuffer)^);
                     otSLong: result.FData.FAsSLong := LongInt(PLongBool(ABuffer)^);
                     otSQWord: result.FData.FAsSInt64 := Int64(PQWordBool(ABuffer)^);
                   end;
                 end;
    tkFloat    : begin
                   case GetTypeData(ATypeInfo)^.FloatType of
                     ftCurr   : result.FData.FAsCurr := PCurrency(ABuffer)^;
                     ftSingle : result.FData.FAsSingle := PSingle(ABuffer)^;
                     ftDouble : result.FData.FAsDouble := PDouble(ABuffer)^;
                     ftExtended: result.FData.FAsExtended := PExtended(ABuffer)^;
                     ftComp   : result.FData.FAsComp := PComp(ABuffer)^;
                   end;
                 end;
  else
    raise Exception.CreateFmt(SErrUnableToGetValueForType,[ATypeInfo^.Name]);
  end;
end;

class procedure TValue.MakeOpenArray(AArray: Pointer; ALength: SizeInt; ATypeInfo: PTypeInfo; out Result: TValue);
var
  el: TValue;
begin
  Result.FData.FTypeInfo := ATypeInfo;
  { resets the whole variant part; FValueData is already Nil }
{$if SizeOf(TMethod) > SizeOf(QWord)}
  Result.FData.FAsMethod.Code := Nil;
  Result.FData.FAsMethod.Data := Nil;
{$else}
  Result.FData.FAsUInt64 := 0;
{$endif}
  if not Assigned(ATypeInfo) then
    Exit;
  if ATypeInfo^.Kind <> tkArray then
    Exit;
  if not Assigned(AArray) then
    Exit;
  if ALength < 0 then
    Exit;
  Result.FData.FValueData := TValueDataIntImpl.CreateRef(@AArray, ATypeInfo, False);
  Result.FData.FArrLength := ALength;
  Make(Nil, Result.TypeData^.ArrayData.ElType, el);
  Result.FData.FElSize := el.DataSize;
end;

{$ifndef NoGenericMethods}
generic class function TValue.From<T>(constref aValue: T): TValue;
begin
  TValue.Make(@aValue, System.TypeInfo(T), Result);
end;

generic class function TValue.FromOpenArray<T>(constref aValue: array of T): TValue;
var
  arrdata: Pointer;
begin
  if Length(aValue) > 0 then
    arrdata := @aValue[0]
  else
    arrdata := Nil;
  TValue.MakeOpenArray(arrdata, Length(aValue), System.TypeInfo(aValue), Result);
end;
{$endif}

function TValue.GetIsEmpty: boolean;
begin
  result := (FData.FTypeInfo=nil) or
            ((Kind in [tkSString, tkObject, tkRecord, tkArray]) and not Assigned(FData.FValueData)) or
            ((Kind in [tkClass, tkClassRef, tkInterfaceRaw]) and not Assigned(FData.FAsPointer));
end;

function TValue.IsArray: boolean;
begin
  result := kind in [tkArray, tkDynArray];
end;

function TValue.IsOpenArray: Boolean;
var
  td: PTypeData;
begin
  td := TypeData;
  Result := (Kind = tkArray) and (td^.ArrayData.Size = 0) and (td^.ArrayData.ElCount = 0)
end;

function TValue.AsString: string;
begin
  if System.GetTypeKind(String) = tkUString then
    Result := String(AsUnicodeString)
  else
    Result := String(AsAnsiString);
end;

function TValue.AsUnicodeString: UnicodeString;
begin
  if (Kind in [tkSString, tkAString, tkUString, tkWString]) and not Assigned(FData.FValueData) then
    Result := ''
  else
    case Kind of
      tkSString:
        Result := UnicodeString(PShortString(FData.FValueData.GetReferenceToRawData)^);
      tkAString:
        Result := UnicodeString(PAnsiString(FData.FValueData.GetReferenceToRawData)^);
      tkWString:
        Result := UnicodeString(PWideString(FData.FValueData.GetReferenceToRawData)^);
      tkUString:
        Result := UnicodeString(PUnicodeString(FData.FValueData.GetReferenceToRawData)^);
    else
      raise EInvalidCast.Create(SErrInvalidTypecast);
    end;
end;

function TValue.AsAnsiString: AnsiString;
begin
  if (Kind in [tkSString, tkAString, tkUString, tkWString]) and not Assigned(FData.FValueData) then
    Result := ''
  else
    case Kind of
      tkSString:
        Result := AnsiString(PShortString(FData.FValueData.GetReferenceToRawData)^);
      tkAString:
        Result := AnsiString(PAnsiString(FData.FValueData.GetReferenceToRawData)^);
      tkWString:
        Result := AnsiString(PWideString(FData.FValueData.GetReferenceToRawData)^);
      tkUString:
        Result := AnsiString(PUnicodeString(FData.FValueData.GetReferenceToRawData)^);
    else
      raise EInvalidCast.Create(SErrInvalidTypecast);
    end;
end;

function TValue.AsExtended: Extended;
begin
  if Kind = tkFloat then
    begin
    case TypeData^.FloatType of
      ftSingle   : result := FData.FAsSingle;
      ftDouble   : result := FData.FAsDouble;
      ftExtended : result := FData.FAsExtended;
      ftCurr     : result := FData.FAsCurr;
      ftComp     : result := FData.FAsComp;
    else
      raise EInvalidCast.Create(SErrInvalidTypecast);
    end;
    end
  else
    raise EInvalidCast.Create(SErrInvalidTypecast);
end;

function TValue.IsObject: boolean;
begin
  result := (Kind = tkClass) or ((Kind = tkUnknown) and not Assigned(FData.FAsObject));
end;

function TValue.IsClass: boolean;
begin
  result := (Kind = tkClassRef) or ((Kind in [tkClass,tkUnknown]) and not Assigned(FData.FAsObject));
end;

function TValue.IsOrdinal: boolean;
begin
  result := (Kind in [tkInteger, tkInt64, tkQWord, tkBool, tkEnumeration]) or
            ((Kind in [tkClass, tkClassRef, tkInterfaceRaw, tkUnknown]) and not Assigned(FData.FAsPointer));
end;

function TValue.IsType(ATypeInfo: PTypeInfo): boolean;
begin
  result := ATypeInfo = TypeInfo;
end;

function TValue.AsObject: TObject;
begin
  if IsObject or (IsClass and not Assigned(FData.FAsObject)) then
    result := TObject(FData.FAsObject)
  else
    raise EInvalidCast.Create(SErrInvalidTypecast);
end;

function TValue.AsClass: TClass;
begin
  if IsClass then
    result := FData.FAsClass
  else
    raise EInvalidCast.Create(SErrInvalidTypecast);
end;

function TValue.AsBoolean: boolean;
begin
  if (Kind = tkBool) then
    case TypeData^.OrdType of
      otSByte:  Result := ByteBool(FData.FAsSByte);
      otUByte:  Result := Boolean(FData.FAsUByte);
      otSWord:  Result := WordBool(FData.FAsSWord);
      otUWord:  Result := Boolean16(FData.FAsUWord);
      otSLong:  Result := LongBool(FData.FAsSLong);
      otULong:  Result := Boolean32(FData.FAsULong);
      otSQWord: Result := QWordBool(FData.FAsSInt64);
      otUQWord: Result := Boolean64(FData.FAsUInt64);
    end
  else
    raise EInvalidCast.Create(SErrInvalidTypecast);
end;

function TValue.AsOrdinal: Int64;
begin
  if IsOrdinal then
    if Kind in [tkClass, tkClassRef, tkInterfaceRaw, tkUnknown] then
      Result := 0
    else
      case TypeData^.OrdType of
        otSByte:  Result := FData.FAsSByte;
        otUByte:  Result := FData.FAsUByte;
        otSWord:  Result := FData.FAsSWord;
        otUWord:  Result := FData.FAsUWord;
        otSLong:  Result := FData.FAsSLong;
        otULong:  Result := FData.FAsULong;
        otSQWord: Result := FData.FAsSInt64;
        otUQWord: Result := FData.FAsUInt64;
      end
  else
    raise EInvalidCast.Create(SErrInvalidTypecast);
end;

function TValue.AsCurrency: Currency;
begin
  if (Kind = tkFloat) and (TypeData^.FloatType=ftCurr) then
    result := FData.FAsCurr
  else
    raise EInvalidCast.Create(SErrInvalidTypecast);
end;

function TValue.AsInteger: Integer;
begin
  if Kind in [tkInteger, tkInt64, tkQWord] then
    case TypeData^.OrdType of
      otSByte:  Result := FData.FAsSByte;
      otUByte:  Result := FData.FAsUByte;
      otSWord:  Result := FData.FAsSWord;
      otUWord:  Result := FData.FAsUWord;
      otSLong:  Result := FData.FAsSLong;
      otULong:  Result := FData.FAsULong;
      otSQWord: Result := FData.FAsSInt64;
      otUQWord: Result := FData.FAsUInt64;
    end
  else
    raise EInvalidCast.Create(SErrInvalidTypecast);
end;

function TValue.AsInt64: Int64;
begin
  if Kind in [tkInteger, tkInt64, tkQWord] then
    case TypeData^.OrdType of
      otSByte:  Result := FData.FAsSByte;
      otUByte:  Result := FData.FAsUByte;
      otSWord:  Result := FData.FAsSWord;
      otUWord:  Result := FData.FAsUWord;
      otSLong:  Result := FData.FAsSLong;
      otULong:  Result := FData.FAsULong;
      otSQWord: Result := FData.FAsSInt64;
      otUQWord: Result := FData.FAsUInt64;
    end
  else if (Kind = tkFloat) and (TypeData^.FloatType = ftComp) then
    Result := Int64(FData.FAsComp)
  else
    raise EInvalidCast.Create(SErrInvalidTypecast);
end;

function TValue.AsUInt64: QWord;
begin
  if Kind in [tkInteger, tkInt64, tkQWord] then
    case TypeData^.OrdType of
      otSByte:  Result := FData.FAsSByte;
      otUByte:  Result := FData.FAsUByte;
      otSWord:  Result := FData.FAsSWord;
      otUWord:  Result := FData.FAsUWord;
      otSLong:  Result := FData.FAsSLong;
      otULong:  Result := FData.FAsULong;
      otSQWord: Result := FData.FAsSInt64;
      otUQWord: Result := FData.FAsUInt64;
    end
  else if (Kind = tkFloat) and (TypeData^.FloatType = ftComp) then
    Result := QWord(FData.FAsComp)
  else
    raise EInvalidCast.Create(SErrInvalidTypecast);
end;

function TValue.AsInterface: IInterface;
begin
  if Kind = tkInterface then
    Result := PInterface(FData.FValueData.GetReferenceToRawData)^
  else if (Kind in [tkClass, tkClassRef, tkUnknown]) and not Assigned(FData.FAsPointer) then
    Result := Nil
  else
    raise EInvalidCast.Create(SErrInvalidTypecast);
end;

function TValue.ToString: String;
begin
  case Kind of
    tkWString,
    tkUString : result := AsUnicodeString;
    tkSString,
    tkAString : result := AsAnsiString;
    tkInteger : result := IntToStr(AsInteger);
    tkQWord   : result := IntToStr(AsUInt64);
    tkInt64   : result := IntToStr(AsInt64);
    tkBool    : result := BoolToStr(AsBoolean, True);
    tkPointer : result := '(pointer @ ' + HexStr(FData.FAsPointer) + ')';
    tkInterface : result := '(interface @ ' + HexStr(PPointer(FData.FValueData.GetReferenceToRawData)^) + ')';
    tkInterfaceRaw : result := '(raw interface @ ' + HexStr(FData.FAsPointer) + ')';
  else
    result := '';
  end;
end;

function TValue.GetArrayLength: SizeInt;
var
  td: PTypeData;
begin
  if not IsArray then
    raise EInvalidCast.Create(SErrInvalidTypecast);
  if Kind = tkDynArray then
    Result := DynArraySize(PPointer(FData.FValueData.GetReferenceToRawData)^)
  else begin
    td := TypeData;
    if (td^.ArrayData.Size = 0) and (td^.ArrayData.ElCount = 0) then
      Result := FData.FArrLength
    else
      Result := td^.ArrayData.ElCount;
  end;
end;

function TValue.GetArrayElement(AIndex: SizeInt): TValue;
var
  data: Pointer;
  eltype: PTypeInfo;
  elsize: SizeInt;
  td: PTypeData;
begin
  if not IsArray then
    raise EInvalidCast.Create(SErrInvalidTypecast);
  if Kind = tkDynArray then begin
    data := DynArrayIndex(PPointer(FData.FValueData.GetReferenceToRawData)^, [AIndex], FData.FTypeInfo);
    eltype := TypeData^.elType2;
  end else begin
    td := TypeData;
    eltype := td^.ArrayData.ElType;
    { open array? }
    if (td^.ArrayData.Size = 0) and (td^.ArrayData.ElCount = 0) then begin
      data := PPointer(FData.FValueData.GetReferenceToRawData)^;
      elsize := FData.FElSize
    end else begin
      data := FData.FValueData.GetReferenceToRawData;
      elsize := td^.ArrayData.Size div td^.ArrayData.ElCount;
    end;
    data := PByte(data) + AIndex * elsize;
  end;
  { MakeWithoutCopy? }
  Make(data, eltype, Result);
end;

procedure TValue.SetArrayElement(AIndex: SizeInt; constref AValue: TValue);
var
  data: Pointer;
  eltype: PTypeInfo;
  elsize: SizeInt;
  td, tdv: PTypeData;
begin
  if not IsArray then
    raise EInvalidCast.Create(SErrInvalidTypecast);
  if Kind = tkDynArray then begin
    data := DynArrayIndex(PPointer(FData.FValueData.GetReferenceToRawData)^, [AIndex], FData.FTypeInfo);
    eltype := TypeData^.elType2;
  end else begin
    td := TypeData;
    eltype := td^.ArrayData.ElType;
    { open array? }
    if (td^.ArrayData.Size = 0) and (td^.ArrayData.ElCount = 0) then begin
      data := PPointer(FData.FValueData.GetReferenceToRawData)^;
      elsize := FData.FElSize
    end else begin
      data := FData.FValueData.GetReferenceToRawData;
      elsize := td^.ArrayData.Size div td^.ArrayData.ElCount;
    end;
    data := PByte(data) + AIndex * elsize;
  end;
  { maybe we'll later on allow some typecasts, but for now be restrictive }
  if eltype^.Kind <> AValue.Kind then
    raise EInvalidCast.Create(SErrInvalidTypecast);
  td := GetTypeData(eltype);
  tdv := AValue.TypeData;
  if ((eltype^.Kind in [tkInteger, tkBool, tkEnumeration, tkSet]) and (td^.OrdType <> tdv^.OrdType)) or
      ((eltype^.Kind = tkFloat) and (td^.FloatType <> tdv^.FloatType)) then
    raise EInvalidCast.Create(SErrInvalidTypecast);
  if Assigned(AValue.FData.FValueData) and (eltype^.Kind <> tkSString) then
    IntCopy(AValue.FData.FValueData.GetReferenceToRawData, data, eltype)
  else
    Move(AValue.GetReferenceToRawData^, data^, AValue.DataSize);
end;

function TValue.TryAsOrdinal(out AResult: int64): boolean;
begin
  result := IsOrdinal;
  if result then
    AResult := AsOrdinal;
end;

function TValue.GetReferenceToRawData: Pointer;
begin
  if not Assigned(FData.FTypeInfo) then
    Result := Nil
  else if Assigned(FData.FValueData) then
    Result := FData.FValueData.GetReferenceToRawData
  else begin
    Result := Nil;
    case Kind of
      tkInteger,
      tkEnumeration,
      tkInt64,
      tkQWord,
      tkBool:
        case TypeData^.OrdType of
          otSByte:
            Result := @FData.FAsSByte;
          otUByte:
            Result := @FData.FAsUByte;
          otSWord:
            Result := @FData.FAsSWord;
          otUWord:
            Result := @FData.FAsUWord;
          otSLong:
            Result := @FData.FAsSLong;
          otULong:
            Result := @FData.FAsULong;
          otSQWord:
            Result := @FData.FAsSInt64;
          otUQWord:
            Result := @FData.FAsUInt64;
        end;
      tkSet: begin
        case TypeData^.OrdType of
          otUByte: begin
            case TypeData^.SetSize of
              1:
                Result := @FData.FAsUByte;
              2:
                Result := @FData.FAsUWord;
              3, 4:
                Result := @FData.FAsULong;
              5..8:
                Result := @FData.FAsUInt64;
              else
                { this should have gone through FAsValueData :/ }
                Result := Nil;
            end;
          end;
          otUWord:
            Result := @FData.FAsUWord;
          otULong:
            Result := @FData.FAsULong;
          else
            Result := Nil;
        end;
      end;
      tkChar:
        Result := @FData.FAsUByte;
      tkFloat:
        case TypeData^.FloatType of
          ftSingle:
            Result := @FData.FAsSingle;
          ftDouble:
            Result := @FData.FAsDouble;
          ftExtended:
            Result := @FData.FAsExtended;
          ftComp:
            Result := @FData.FAsComp;
          ftCurr:
            Result := @FData.FAsCurr;
        end;
      tkMethod:
        Result := @FData.FAsMethod;
      tkClass:
        Result := @FData.FAsObject;
      tkWChar:
        Result := @FData.FAsUWord;
      tkInterfaceRaw:
        Result := @FData.FAsPointer;
      tkProcVar:
        Result := @FData.FAsMethod.Code;
      tkUChar:
        Result := @FData.FAsUWord;
      tkFile:
        Result := @FData.FAsPointer;
      tkClassRef:
        Result := @FData.FAsClass;
      tkPointer:
        Result := @FData.FAsPointer;
      tkVariant,
      tkDynArray,
      tkArray,
      tkObject,
      tkRecord,
      tkInterface,
      tkSString,
      tkLString,
      tkAString,
      tkUString,
      tkWString:
        Assert(false, 'Managed/complex type not handled through IValueData');
    end;
  end;
end;

procedure TValue.ExtractRawData(ABuffer: Pointer);
begin
  if Assigned(FData.FValueData) then
    FData.FValueData.ExtractRawData(ABuffer)
  else if Assigned(FData.FTypeInfo) then
    Move((@FData.FAsPointer)^, ABuffer^, DataSize);
end;

procedure TValue.ExtractRawDataNoCopy(ABuffer: Pointer);
begin
  if Assigned(FData.FValueData) then
    FData.FValueData.ExtractRawDataNoCopy(ABuffer)
  else if Assigned(FData.FTypeInfo) then
    Move((@FData.FAsPointer)^, ABuffer^, DataSize);
end;

class operator TValue.:=(const AValue: String): TValue;
begin
  Make(@AValue, System.TypeInfo(AValue), Result);
end;

class operator TValue.:=(AValue: LongInt): TValue;
begin
  Make(@AValue, System.TypeInfo(AValue), Result);
end;

class operator TValue.:=(AValue: Single): TValue;
begin
  Make(@AValue, System.TypeInfo(AValue), Result);
end;

class operator TValue.:=(AValue: Double): TValue;
begin
  Make(@AValue, System.TypeInfo(AValue), Result);
end;

{$ifdef FPC_HAS_TYPE_EXTENDED}
class operator TValue.:=(AValue: Extended): TValue;
begin
  Make(@AValue, System.TypeInfo(AValue), Result);
end;
{$endif}

class operator TValue.:=(AValue: Currency): TValue;
begin
  Make(@AValue, System.TypeInfo(AValue), Result);
end;

class operator TValue.:=(AValue: Int64): TValue;
begin
  Make(@AValue, System.TypeInfo(AValue), Result);
end;

class operator TValue.:=(AValue: QWord): TValue;
begin
  Make(@AValue, System.TypeInfo(AValue), Result);
end;

class operator TValue.:=(AValue: TObject): TValue;
begin
  Make(@AValue, System.TypeInfo(AValue), Result);
end;

class operator TValue.:=(AValue: TClass): TValue;
begin
  Make(@AValue, System.TypeInfo(AValue), Result);
end;

class operator TValue.:=(AValue: Boolean): TValue;
begin
  Make(@AValue, System.TypeInfo(AValue), Result);
end;


function Invoke(aCodeAddress: CodePointer; const aArgs: TValueArray;
  aCallConv: TCallConv; aResultType: PTypeInfo; aIsStatic: Boolean;
  aIsConstructor: Boolean): TValue;
var
  funcargs: TFunctionCallParameterArray;
  i: LongInt;
  flags: TFunctionCallFlags;
begin
  { sanity check }
  if not Assigned(FuncCallMgr[aCallConv].Invoke) then
    raise ENotImplemented.Create(SErrInvokeNotImplemented);

  { ToDo: handle IsConstructor }
  if aIsConstructor then
    raise ENotImplemented.Create(SErrInvokeNotImplemented);

  flags := [];
  if aIsStatic then
    Include(flags, fcfStatic)
  else if Length(aArgs) = 0 then
    raise EInvocationError.Create(SErrMissingSelfParam);

  SetLength(funcargs, Length(aArgs));
  for i := Low(aArgs) to High(aArgs) do begin
    funcargs[i - Low(aArgs) + Low(funcargs)].ValueRef := aArgs[i].GetReferenceToRawData;
    funcargs[i - Low(aArgs) + Low(funcargs)].ValueSize := aArgs[i].DataSize;
    funcargs[i - Low(aArgs) + Low(funcargs)].Info.ParamType := aArgs[i].TypeInfo;
    funcargs[i - Low(aArgs) + Low(funcargs)].Info.ParamFlags := [];
    funcargs[i - Low(aArgs) + Low(funcargs)].Info.ParaLocs := Nil;
  end;

  if Assigned(aResultType) then
    TValue.Make(Nil, aResultType, Result)
  else
    Result := TValue.Empty;

  FuncCallMgr[aCallConv].Invoke(aCodeAddress, funcargs, aCallConv, aResultType, Result.GetReferenceToRawData, flags);
end;

function Invoke(const aName: String; aCodeAddress: CodePointer; aCallConv: TCallConv; aStatic: Boolean; aInstance: TValue; constref aArgs: array of TValue; const aParams: specialize TArray<TRttiParameter>; aReturnType: TRttiType): TValue;
var
  arrparam, param: TRttiParameter;
  unhidden, highs, i: SizeInt;
  args: TFunctionCallParameterArray;
  highargs: array of SizeInt;
  restype: PTypeInfo;
  resptr: Pointer;
  mgr: TFunctionCallManager;
  flags: TFunctionCallFlags;
begin
  mgr := FuncCallMgr[aCallConv];
  if not Assigned(mgr.Invoke) then
    raise EInvocationError.CreateFmt(SErrCallConvNotSupported, [CCToStr(aCallConv)]);

  if not Assigned(aCodeAddress) then
    raise EInvocationError.CreateFmt(SErrInvokeNoCodeAddr, [aName]);

  unhidden := 0;
  highs := 0;
  for param in aParams do begin
    if unhidden < Length(aArgs) then begin
      if pfArray in param.Flags then begin
        if Assigned(aArgs[unhidden].TypeInfo) and not aArgs[unhidden].IsArray and (aArgs[unhidden].Kind <> param.ParamType.TypeKind) then
          raise EInvocationError.CreateFmt(SErrInvokeArrayArgExpected, [param.Name, aName]);
      end else if not (pfHidden in param.Flags) then begin
        if Assigned(param.ParamType) and (aArgs[unhidden].Kind <> param.ParamType.TypeKind) then
          raise EInvocationError.CreateFmt(SErrInvokeArgInvalidType, [param.Name, aName]);
      end;
    end;
    if not (pfHidden in param.Flags) then
      Inc(unhidden);
    if pfHigh in param.Flags then
      Inc(highs);
  end;

  if unhidden <> Length(aArgs) then
    raise EInvocationError.CreateFmt(SErrInvokeArgCount, [aName, unhidden, Length(aArgs)]);

  if Assigned(aReturnType) then begin
    TValue.Make(Nil, aReturnType.FTypeInfo, Result);
    resptr := Result.GetReferenceToRawData;
    restype := aReturnType.FTypeInfo;
  end else begin
    Result := TValue.Empty;
    resptr := Nil;
    restype := Nil;
  end;

  SetLength(highargs, highs);
  SetLength(args, Length(aParams));
  unhidden := 0;
  highs := 0;

  for i := 0 to High(aParams) do begin
    param := aParams[i];
    if Assigned(param.ParamType) then
      args[i].Info.ParamType := param.ParamType.FTypeInfo
    else
      args[i].Info.ParamType := Nil;
    args[i].Info.ParamFlags := param.Flags;
    args[i].Info.ParaLocs := Nil;

    if pfHidden in param.Flags then begin
      if pfSelf in param.Flags then
        args[i].ValueRef := aInstance.GetReferenceToRawData
      else if pfResult in param.Flags then begin
        if not Assigned(restype) then
          raise EInvocationError.CreateFmt(SErrInvokeRttiDataError, [aName]);
        args[i].ValueRef := resptr;
        restype := Nil;
        resptr := Nil;
      end else if pfHigh in param.Flags then begin
        { the corresponding array argument is the *previous* unhidden argument }
        if aArgs[unhidden - 1].IsArray then
          highargs[highs] := aArgs[unhidden - 1].GetArrayLength - 1
        else if not Assigned(aArgs[unhidden - 1].TypeInfo) then
          highargs[highs] := -1
        else
          highargs[highs] := 0;
        args[i].ValueRef := @highargs[highs];
        Inc(highs);
      end;
    end else begin
      if (pfArray in param.Flags) then begin
        if not Assigned(aArgs[unhidden].TypeInfo) then
          args[i].ValueRef := Nil
        else if aArgs[unhidden].Kind = tkDynArray then
          args[i].ValueRef := PPointer(aArgs[unhidden].GetReferenceToRawData)^
        else
          args[i].ValueRef := aArgs[unhidden].GetReferenceToRawData;
      end else
        args[i].ValueRef := aArgs[unhidden].GetReferenceToRawData;

      Inc(unhidden);
    end;
  end;

  flags := [];
  if aStatic then
    Include(flags, fcfStatic);

  mgr.Invoke(aCodeAddress, args, aCallConv, restype, resptr, flags);
end;

function CreateCallbackProc(aHandler: TFunctionCallProc; aCallConv: TCallConv; aArgs: array of TFunctionCallParameterInfo; aResultType: PTypeInfo; aFlags: TFunctionCallFlags; aContext: Pointer): TFunctionCallCallback;
begin
  if not Assigned(FuncCallMgr[aCallConv].CreateCallbackProc) then
    raise ENotImplemented.Create(SErrCallbackNotImplemented);

  if not Assigned(aHandler) then
    raise EArgumentNilException.Create(SErrCallbackHandlerNil);

  Result := FuncCallMgr[aCallConv].CreateCallbackProc(aHandler, aCallConv, aArgs, aResultType, aFlags, aContext);
end;

function CreateCallbackMethod(aHandler: TFunctionCallMethod; aCallConv: TCallConv; aArgs: array of TFunctionCallParameterInfo; aResultType: PTypeInfo; aFlags: TFunctionCallFlags; aContext: Pointer): TFunctionCallCallback;
begin
  if not Assigned(FuncCallMgr[aCallConv].CreateCallbackMethod) then
    raise ENotImplemented.Create(SErrCallbackNotImplemented);

  if not Assigned(aHandler) then
    raise EArgumentNilException.Create(SErrCallbackHandlerNil);

  Result := FuncCallMgr[aCallConv].CreateCallbackMethod(aHandler, aCallConv, aArgs, aResultType, aFlags, aContext);
end;

function IsManaged(TypeInfo: PTypeInfo): boolean;
begin
  if Assigned(TypeInfo) then
    case TypeInfo^.Kind of
      tkAString,
      tkLString,
      tkWString,
      tkUString,
      tkInterface,
      tkVariant,
      tkDynArray  : Result := true;
      tkArray     : Result := IsManaged(GetTypeData(TypeInfo)^.ArrayData.ElType);
      tkRecord,
      tkObject    :
        with GetTypeData(TypeInfo)^.RecInitData^ do
          Result := (ManagedFieldCount > 0) or Assigned(ManagementOp);
    else
      Result := false;
    end
  else
    Result := false;
end;

{$ifndef InLazIDE}
generic function OpenArrayToDynArrayValue<T>(constref aArray: array of T): TValue;
var
  arr: specialize TArray<T>;
  i: SizeInt;
begin
  SetLength(arr, Length(aArray));
  for i := 0 to High(aArray) do
    arr[i] := aArray[i];
  Result := TValue.specialize From<specialize TArray<T>>(arr);
end;
{$endif}

{ TRttiPointerType }

function TRttiPointerType.GetReferredType: TRttiType;
begin
  Result := GRttiPool.GetType(FTypeData^.RefType);
end;

{ TRttiRefCountedInterfaceType }

function TRttiRefCountedInterfaceType.IntfData: PInterfaceData;
begin
  Result := PInterfaceData(FTypeData);
end;

function TRttiRefCountedInterfaceType.MethodTable: PIntfMethodTable;
begin
  Result := IntfData^.MethodTable;
end;

function TRttiRefCountedInterfaceType.GetIntfBaseType: TRttiInterfaceType;
var
  context: TRttiContext;
begin
  if not Assigned(IntfData^.Parent) then
    Exit(Nil);

  context := TRttiContext.Create;
  try
    Result := context.GetType(IntfData^.Parent^) as TRttiInterfaceType;
  finally
    context.Free;
  end;
end;

function TRttiRefCountedInterfaceType.GetDeclaringUnitName: String;
begin
  Result := IntfData^.UnitName;
end;

function TRttiRefCountedInterfaceType.GetGUID: TGUID;
begin
  Result := IntfData^.GUID;
end;

function TRttiRefCountedInterfaceType.GetIntfFlags: TIntfFlags;
begin
  Result := IntfData^.Flags;
end;

function TRttiRefCountedInterfaceType.GetIntfType: TInterfaceType;
begin
  Result := itRefCounted;
end;

{ TRttiRawInterfaceType }

function TRttiRawInterfaceType.IntfData: PInterfaceRawData;
begin
  Result := PInterfaceRawData(FTypeData);
end;

function TRttiRawInterfaceType.MethodTable: PIntfMethodTable;
begin
  { currently there is none! }
  Result := Nil;
end;

function TRttiRawInterfaceType.GetIntfBaseType: TRttiInterfaceType;
var
  context: TRttiContext;
begin
  if not Assigned(IntfData^.Parent) then
    Exit(Nil);

  context := TRttiContext.Create;
  try
    Result := context.GetType(IntfData^.Parent^) as TRttiInterfaceType;
  finally
    context.Free;
  end;
end;

function TRttiRawInterfaceType.GetDeclaringUnitName: String;
begin
  Result := IntfData^.UnitName;
end;

function TRttiRawInterfaceType.GetGUID: TGUID;
begin
  Result := IntfData^.IID;
end;

function TRttiRawInterfaceType.GetGUIDStr: String;
begin
  Result := IntfData^.IIDStr;
end;

function TRttiRawInterfaceType.GetIntfFlags: TIntfFlags;
begin
  Result := IntfData^.Flags;
end;

function TRttiRawInterfaceType.GetIntfType: TInterfaceType;
begin
  Result := itRaw;
end;

{ TRttiVmtMethodParameter }

function TRttiVmtMethodParameter.GetHandle: Pointer;
begin
  Result := FVmtMethodParam;
end;

function TRttiVmtMethodParameter.GetName: String;
begin
  Result := FVmtMethodParam^.Name;
end;

function TRttiVmtMethodParameter.GetFlags: TParamFlags;
begin
  Result := FVmtMethodParam^.Flags;
end;

function TRttiVmtMethodParameter.GetParamType: TRttiType;
var
  context: TRttiContext;
begin
  if not Assigned(FVmtMethodParam^.ParamType) then
    Exit(Nil);

  context := TRttiContext.Create;
  try
    Result := context.GetType(FVmtMethodParam^.ParamType^);
  finally
    context.Free;
  end;
end;

constructor TRttiVmtMethodParameter.Create(AVmtMethodParam: PVmtMethodParam);
begin
  inherited Create;
  FVmtMethodParam := AVmtMethodParam;
end;

{ TRttiMethodTypeParameter }

function TRttiMethodTypeParameter.GetHandle: Pointer;
begin
  Result := fHandle;
end;

function TRttiMethodTypeParameter.GetName: String;
begin
  Result := fName;
end;

function TRttiMethodTypeParameter.GetFlags: TParamFlags;
begin
  Result := fFlags;
end;

function TRttiMethodTypeParameter.GetParamType: TRttiType;
var
  context: TRttiContext;
begin
  context := TRttiContext.Create;
  try
    Result := context.GetType(FType);
  finally
    context.Free;
  end;
end;

constructor TRttiMethodTypeParameter.Create(aHandle: Pointer; const aName: String; aFlags: TParamFlags; aType: PTypeInfo);
begin
  fHandle := aHandle;
  fName := aName;
  fFlags := aFlags;
  fType := aType;
end;

{ TRttiIntfMethod }

function TRttiIntfMethod.GetHandle: Pointer;
begin
  Result := FIntfMethodEntry;
end;

function TRttiIntfMethod.GetName: String;
begin
  Result := FIntfMethodEntry^.Name;
end;

function TRttiIntfMethod.GetCallingConvention: TCallConv;
begin
  Result := FIntfMethodEntry^.CC;
end;

function TRttiIntfMethod.GetCodeAddress: CodePointer;
begin
  Result := Nil;
end;

function TRttiIntfMethod.GetDispatchKind: TDispatchKind;
begin
  Result := dkInterface;
end;

function TRttiIntfMethod.GetHasExtendedInfo: Boolean;
begin
  Result := True;
end;

function TRttiIntfMethod.GetIsClassMethod: Boolean;
begin
  Result := False;
end;

function TRttiIntfMethod.GetIsConstructor: Boolean;
begin
  Result := False;
end;

function TRttiIntfMethod.GetIsDestructor: Boolean;
begin
  Result := False;
end;

function TRttiIntfMethod.GetIsStatic: Boolean;
begin
  Result := False;
end;

function TRttiIntfMethod.GetMethodKind: TMethodKind;
begin
  Result := FIntfMethodEntry^.Kind;
end;

function TRttiIntfMethod.GetReturnType: TRttiType;
var
  context: TRttiContext;
begin
  if not Assigned(FIntfMethodEntry^.ResultType) then
    Exit(Nil);

  context := TRttiContext.Create;
  try
    Result := context.GetType(FIntfMethodEntry^.ResultType^);
  finally
    context.Free;
  end;
end;

function TRttiIntfMethod.GetVirtualIndex: SmallInt;
begin
  Result := FIndex;
end;

constructor TRttiIntfMethod.Create(AParent: TRttiType; AIntfMethodEntry: PIntfMethodEntry; AIndex: SmallInt);
begin
  inherited Create(AParent);
  FIntfMethodEntry := AIntfMethodEntry;
  FIndex := AIndex;
end;

function TRttiIntfMethod.GetParameters(aWithHidden: Boolean): specialize TArray<TRttiParameter>;
var
  param: PVmtMethodParam;
  total, visible: SizeInt;
  context: TRttiContext;
  obj: TRttiObject;
begin
  if aWithHidden and (Length(FParamsAll) > 0) then
    Exit(FParamsAll);
  if not aWithHidden and (Length(FParams) > 0) then
    Exit(FParams);

  if FIntfMethodEntry^.ParamCount = 0 then
    Exit(Nil);

  SetLength(FParams, FIntfMethodEntry^.ParamCount);
  SetLength(FParamsAll, FIntfMethodEntry^.ParamCount);

  context := TRttiContext.Create;
  try
    total := 0;
    visible := 0;
    param := FIntfMethodEntry^.Param[0];
    while total < FIntfMethodEntry^.ParamCount do begin
      obj := context.GetByHandle(param);
      if Assigned(obj) then
        FParamsAll[total] := obj as TRttiVmtMethodParameter
      else begin
        FParamsAll[total] := TRttiVmtMethodParameter.Create(param);
        context.AddObject(FParamsAll[total]);
      end;

      if not (pfHidden in param^.Flags) then begin
        FParams[visible] := FParamsAll[total];
        Inc(visible);
      end;

      param := param^.Next;
      Inc(total);
    end;

    if visible <> total then
      SetLength(FParams, visible);
  finally
    context.Free;
  end;

  if aWithHidden then
    Result := FParamsAll
  else
    Result := FParams;
end;

{ TRttiFloatType }

function TRttiFloatType.GetFloatType: TFloatType;
begin
  result := FTypeData^.FloatType;
end;

{ TRttiParameter }

function TRttiParameter.ToString: String;
var
  f: TParamFlags;
  n: String;
  t: TRttiType;
begin
  if FString = '' then begin
    f := Flags;

    if pfVar in f then
      FString := 'var'
    else if pfConst in f then
      FString := 'const'
    else if pfOut in f then
      FString := 'out'
    else if pfConstRef in f then
      FString := 'constref';
    if FString <> '' then
      FString := FString + ' ';

    n := Name;
    if n = '' then
      n := '<unknown>';
    FString := FString + n;

    t := ParamType;
    if Assigned(t) then begin
      FString := FString + ': ';
      if pfArray in flags then
        FString := 'array of ';
      FString := FString + t.Name;
    end;
  end;

  Result := FString;
end;

{ TMethodImplementation }

function TMethodImplementation.GetCodeAddress: CodePointer;
begin
  Result := fLowLevelCallback.CodeAddress;
end;

procedure TMethodImplementation.InitArgs;
var
  i, refargs: SizeInt;
begin
  i := 0;
  refargs := 0;
  SetLength(fRefArgs, Length(fArgs));
  while i < Length(fArgs) do begin
    if (fArgs[i].ParamFlags * [pfVar, pfOut] <> []) and not (pfHidden in fArgs[i].ParamFlags) then begin
      fRefArgs[refargs] := fArgLen;
      Inc(refargs);
    end;

    if pfArray in fArgs[i].ParamFlags then begin
      Inc(i);
      if (i = Length(fArgs)) or not (pfHigh in fArgs[i].ParamFlags) then
        raise EInsufficientRtti.Create(SErrMethodImplCreateFailed);
      Inc(fArgLen);
    end else if not (pfHidden in fArgs[i].ParamFlags) or (pfSelf in fArgs[i].ParamFlags) then
      Inc(fArgLen)
    else if (pfResult in fArgs[i].ParamFlags) then
      fResult := fArgs[i].ParamType;

    Inc(i);
  end;

  SetLength(fRefArgs, refargs);
end;

procedure TMethodImplementation.HandleCallback(const aArgs: specialize TArray<Pointer>; aResult: Pointer; aContext: Pointer);
var
  i, argidx: SizeInt;
  args: TValueArray;
  res: TValue;
begin
  Assert(fArgLen = Length(aArgs), 'Length of arguments does not match');
  SetLength(args, fArgLen);
  argidx := 0;
  i := 0;
  while i < Length(fArgs) do begin
    if pfArray in fArgs[i].ParamFlags then begin
      Inc(i);
      Assert((i < Length(fArgs)) and (pfHigh in fArgs[i].ParamFlags), 'Expected high parameter after open array parameter');
      TValue.MakeOpenArray(aArgs[i - 1], SizeInt(aArgs[i]), fArgs[i].ParamType, args[argidx]);
    end else if not (pfHidden in fArgs[i].ParamFlags) or (pfSelf in fArgs[i].ParamFlags) then begin
      if Assigned(fArgs[i].ParamType) then
        TValue.Make(aArgs[i], fArgs[i].ParamType, args[argidx])
      else
        TValue.Make(@aArgs[i], TypeInfo(Pointer), args[argidx]);
    end;

    Inc(i);
    Inc(argidx);
  end;

  if Assigned(fCallbackMethod) then
    fCallbackMethod(aContext, args, res)
  else
    fCallbackProc(aContext, args, res);

  { copy back var/out parameters }
  for i := 0 to High(fRefArgs) do begin
    args[fRefArgs[i]].ExtractRawData(aArgs[fRefArgs[i]]);
  end;

  if Assigned(fResult) then
    res.ExtractRawData(aResult);
end;

constructor TMethodImplementation.Create(aCC: TCallConv; aArgs: specialize TArray<TFunctionCallParameterInfo>; aResult: PTypeInfo; aFlags: TFunctionCallFlags; aUserData: Pointer; aCallback: TMethodImplementationCallbackMethod);
begin
  fCC := aCC;
  fArgs := aArgs;
  fResult := aResult;
  fFlags := aFlags;
  fCallbackMethod := aCallback;
  InitArgs;
  fLowLevelCallback := CreateCallbackMethod(@HandleCallback, fCC, aArgs, aResult, aFlags, aUserData);
  if not Assigned(fLowLevelCallback) then
    raise EInsufficientRtti.Create(SErrMethodImplCreateFailed);
end;

constructor TMethodImplementation.Create(aCC: TCallConv; aArgs: specialize TArray<TFunctionCallParameterInfo>; aResult: PTypeInfo; aFlags: TFunctionCallFlags; aUserData: Pointer; aCallback: TMethodImplementationCallbackProc);
begin
  fCC := aCC;
  fArgs := aArgs;
  fResult := aResult;
  fFlags := aFlags;
  fCallbackProc := aCallback;
  InitArgs;
  fLowLevelCallback := CreateCallbackMethod(@HandleCallback, fCC, aArgs, aResult, aFlags, aUserData);
  if not Assigned(fLowLevelCallback) then
    raise EInsufficientRtti.Create(SErrMethodImplCreateFailed);
end;

constructor TMethodImplementation.Create;
begin
  raise EInvalidOpException.Create(SErrMethodImplCreateNoArg);
end;

destructor TMethodImplementation.Destroy;
begin
  fLowLevelCallback.Free;
  inherited Destroy;
end;

{ TRttiMethod }

function TRttiMethod.GetHasExtendedInfo: Boolean;
begin
  Result := False;
end;

function TRttiMethod.GetFlags: TFunctionCallFlags;
begin
  Result := [];
  if IsStatic then
    Include(Result, fcfStatic);
end;

function TRttiMethod.GetParameters: specialize TArray<TRttiParameter>;
begin
  Result := GetParameters(False);
end;

function TRttiMethod.ToString: String;
var
  ret: TRttiType;
  n: String;
  params: specialize TArray<TRttiParameter>;
  i: LongInt;
begin
  if FString = '' then begin
    n := Name;
    if n = '' then
      n := '<unknown>';
    if not HasExtendedInfo then begin
      FString := 'method ' + n;
    end else begin
      ret := ReturnType;

      if IsClassMethod then
        FString := 'class ';
      if IsConstructor then
        FString := FString + 'constructor'
      else if IsDestructor then
        FString := FString + 'destructor'
      else if Assigned(ret) then
        FString := FString + 'function'
      else
        FString := FString + 'procedure';

      FString := FString + ' ' + n;

      params := GetParameters;
      if Length(params) > 0 then begin
        FString := FString + '(';
        for i := 0 to High(params) do begin
          if i > 0 then
            FString := FString + '; ';
          FString := FString + params[i].ToString;
        end;
        FString := FString + ')';
      end;

      if Assigned(ret) then
        FString := FString + ': ' + ret.Name;

      if IsStatic then
        FString := FString + '; static';
    end;
  end;

  Result := FString;
end;

function TRttiMethod.Invoke(aInstance: TObject; const aArgs: array of TValue): TValue;
var
  instance: TValue;
begin
  TValue.Make(@aInstance, TypeInfo(TObject), instance);
  Result := Invoke(instance, aArgs);
end;

function TRttiMethod.Invoke(aInstance: TClass; const aArgs: array of TValue): TValue;
var
  instance: TValue;
begin
  TValue.Make(@aInstance, TypeInfo(TClass), instance);
  Result := Invoke(instance, aArgs);
end;

function TRttiMethod.Invoke(aInstance: TValue; const aArgs: array of TValue): TValue;
var
  addr: CodePointer;
  vmt: PCodePointer;
begin
  if not HasExtendedInfo then
    raise EInvocationError.Create(SErrInvokeInsufficientRtti);

  if IsStatic and not aInstance.IsEmpty then
    raise EInvocationError.CreateFmt(SErrInvokeStaticNoSelf, [Name]);

  if not IsStatic and aInstance.IsEmpty then
    raise EInvocationError.CreateFmt(SErrInvokeNotStaticNeedsSelf, [Name]);

  if not IsStatic and IsClassMethod and not aInstance.IsClass then
    raise EInvocationError.CreateFmt(SErrInvokeClassMethodClassSelf, [Name]);

  addr := Nil;
  if IsStatic then
    addr := CodeAddress
  else begin
    vmt := Nil;
    if aInstance.Kind in [tkInterface, tkInterfaceRaw] then
      vmt := PCodePointer(PPPointer(aInstance.GetReferenceToRawData)^^);
    { ToDo }
    if Assigned(vmt) then
      addr := vmt[VirtualIndex];
  end;

  Result := Rtti.Invoke(Name, addr, CallingConvention, IsStatic, aInstance, aArgs, GetParameters(True), ReturnType);
end;

function TRttiMethod.CreateImplementation(aUserData: Pointer; aCallback: TMethodImplementationCallbackMethod): TMethodImplementation;
var
  params: specialize TArray<TRttiParameter>;
  args: specialize TArray<TFunctionCallParameterInfo>;
  res: PTypeInfo;
  restype: TRttiType;
  resinparam: Boolean;
  i: SizeInt;
begin
  if not Assigned(aCallback) then
    raise EArgumentNilException.Create(SErrMethodImplNoCallback);

  resinparam := False;
  params := GetParameters(True);
  SetLength(args, Length(params));
  for i := 0 to High(params) do begin
    if Assigned(params[i].ParamType) then
      args[i].ParamType := params[i].ParamType.FTypeInfo
    else
      args[i].ParamType := Nil;
    args[i].ParamFlags := params[i].Flags;
    args[i].ParaLocs := Nil;
    if pfResult in params[i].Flags then
      resinparam := True;
  end;

  restype := GetReturnType;
  if Assigned(restype) and not resinparam then
    res := restype.FTypeInfo
  else
    res := Nil;

  Result := TMethodImplementation.Create(GetCallingConvention, args, res, GetFlags, aUserData, aCallback);
end;

function TRttiMethod.CreateImplementation(aUserData: Pointer; aCallback: TMethodImplementationCallbackProc): TMethodImplementation;
var
  params: specialize TArray<TRttiParameter>;
  args: specialize TArray<TFunctionCallParameterInfo>;
  res: PTypeInfo;
  restype: TRttiType;
  resinparam: Boolean;
  i: SizeInt;
begin
  if not Assigned(aCallback) then
    raise EArgumentNilException.Create(SErrMethodImplNoCallback);

  resinparam := False;
  params := GetParameters(True);
  SetLength(args, Length(params));
  for i := 0 to High(params) do begin
    if Assigned(params[i].ParamType) then
      args[i].ParamType := params[i].ParamType.FTypeInfo
    else
      args[i].ParamType := Nil;
    args[i].ParamFlags := params[i].Flags;
    args[i].ParaLocs := Nil;
    if pfResult in params[i].Flags then
      resinparam := True;
  end;

  restype := GetReturnType;
  if Assigned(restype) and not resinparam then
    res := restype.FTypeInfo
  else
    res := Nil;

  Result := TMethodImplementation.Create(GetCallingConvention, args, res, GetFlags, aUserData, aCallback);
end;

{ TRttiInvokableType }

function TRttiInvokableType.GetParameters: specialize TArray<TRttiParameter>;
begin
  Result := GetParameters(False);
end;

function TRttiInvokableType.CreateImplementation(aCallback: TCallbackMethod): TMethodImplementation;
var
  params: specialize TArray<TRttiParameter>;
  args: specialize TArray<TFunctionCallParameterInfo>;
  res: PTypeInfo;
  restype: TRttiType;
  resinparam: Boolean;
  i: SizeInt;
begin
  if not Assigned(aCallback) then
    raise EArgumentNilException.Create(SErrMethodImplNoCallback);

  resinparam := False;
  params := GetParameters(True);
  SetLength(args, Length(params));
  for i := 0 to High(params) do begin
    if Assigned(params[i].ParamType) then
      args[i].ParamType := params[i].ParamType.FTypeInfo
    else
      args[i].ParamType := Nil;
    args[i].ParamFlags := params[i].Flags;
    args[i].ParaLocs := Nil;
    if pfResult in params[i].Flags then
      resinparam := True;
  end;

  restype := GetReturnType;
  if Assigned(restype) and not resinparam then
    res := restype.FTypeInfo
  else
    res := Nil;

  Result := TMethodImplementation.Create(GetCallingConvention, args, res, GetFlags, Self, TMethodImplementationCallbackMethod(aCallback));
end;

function TRttiInvokableType.CreateImplementation(aCallback: TCallbackProc): TMethodImplementation;
var
  params: specialize TArray<TRttiParameter>;
  args: specialize TArray<TFunctionCallParameterInfo>;
  res: PTypeInfo;
  restype: TRttiType;
  resinparam: Boolean;
  i: SizeInt;
begin
  if not Assigned(aCallback) then
    raise EArgumentNilException.Create(SErrMethodImplNoCallback);

  resinparam := False;
  params := GetParameters(True);
  SetLength(args, Length(params));
  for i := 0 to High(params) do begin
    if Assigned(params[i].ParamType) then
      args[i].ParamType := params[i].ParamType.FTypeInfo
    else
      args[i].ParamType := Nil;
    args[i].ParamFlags := params[i].Flags;
    args[i].ParaLocs := Nil;
    if pfResult in params[i].Flags then
      resinparam := True;
  end;

  restype := GetReturnType;
  if Assigned(restype) and not resinparam then
    res := restype.FTypeInfo
  else
    res := Nil;

  Result := TMethodImplementation.Create(GetCallingConvention, args, res, GetFlags, Self, TMethodImplementationCallbackProc(aCallback));
end;

{ TRttiMethodType }

function TRttiMethodType.GetParameters(aWithHidden: Boolean): specialize TArray<TRttiParameter>;
type
  TParamInfo = record
    Handle: Pointer;
    Flags: TParamFlags;
    Name: String;
  end;

  PParamFlags = ^TParamFlags;
  PCallConv = ^TCallConv;
  PPPTypeInfo = ^PPTypeInfo;

var
  infos: array of TParamInfo;
  total, visible, i: SizeInt;
  ptr: PByte;
  paramtypes: PPPTypeInfo;
  paramtype: PTypeInfo;
  context: TRttiContext;
  obj: TRttiObject;
begin
  if aWithHidden and (Length(FParamsAll) > 0) then
    Exit(FParamsAll);
  if not aWithHidden and (Length(FParams) > 0) then
    Exit(FParams);

  ptr := @FTypeData^.ParamList[0];
  visible := 0;
  total := 0;

  if FTypeData^.ParamCount > 0 then begin
    SetLength(infos, FTypeData^.ParamCount);

    while total < FTypeData^.ParamCount do begin
      infos[total].Handle := ptr;
      infos[total].Flags := PParamFlags(ptr)^;
      Inc(ptr, SizeOf(TParamFlags));
      { handle name }
      infos[total].Name := PShortString(ptr)^;
      Inc(ptr, ptr^ + SizeOf(Byte));
      { skip type name }
      Inc(ptr, ptr^ + SizeOf(Byte));
      { align? }
      if not (pfHidden in infos[total].Flags) then
        Inc(visible);
      Inc(total);
    end;
  end;

  if FTypeData^.MethodKind in [mkFunction, mkClassFunction] then begin
    { skip return type name }
    ptr := AlignTypeData(PByte(ptr) + ptr^ + SizeOf(Byte));
    { handle return type }
    FReturnType := GRttiPool.GetType(PPPTypeInfo(ptr)^^);
    Inc(ptr, SizeOf(PPTypeInfo));
  end;

  { handle calling convention }
  FCallConv := PCallConv(ptr)^;
  Inc(ptr, SizeOf(TCallConv));

  SetLength(FParamsAll, FTypeData^.ParamCount);
  SetLength(FParams, visible);

  if FTypeData^.ParamCount > 0 then begin
    context := TRttiContext.Create;
    try
      paramtypes := PPPTypeInfo(ptr);
      visible := 0;
      for i := 0 to FTypeData^.ParamCount - 1 do begin
        obj := context.GetByHandle(infos[i].Handle);
        if Assigned(obj) then
          FParamsAll[i] := obj as TRttiMethodTypeParameter
        else begin
          if Assigned(paramtypes[i]) then
            paramtype := paramtypes[i]^
          else
            paramtype := Nil;
          FParamsAll[i] := TRttiMethodTypeParameter.Create(infos[i].Handle, infos[i].Name, infos[i].Flags, paramtype);
          context.AddObject(FParamsAll[i]);
        end;

        if not (pfHidden in infos[i].Flags) then begin
          FParams[visible] := FParamsAll[i];
          Inc(visible);
        end;
      end;
    finally
      context.Free;
    end;
  end;

  if aWithHidden then
    Result := FParamsAll
  else
    Result := FParams;
end;

function TRttiMethodType.GetCallingConvention: TCallConv;
begin
  { the calling convention is located after the parameters, so get the parameters
    which will also initialize the calling convention }
  GetParameters(True);
  Result := FCallConv;
end;

function TRttiMethodType.GetReturnType: TRttiType;
begin
  if FTypeData^.MethodKind in [mkFunction, mkClassFunction] then begin
    { the return type is located after the parameters, so get the parameters
      which will also initialize the return type }
    GetParameters(True);
    Result := FReturnType;
  end else
    Result := Nil;
end;

function TRttiMethodType.GetFlags: TFunctionCallFlags;
begin
  Result := [];
end;

function TRttiMethodType.Invoke(const aCallable: TValue; const aArgs: array of TValue): TValue;
var
  method: PMethod;
  inst: TValue;
begin
  if aCallable.Kind <> tkMethod then
    raise EInvocationError.CreateFmt(SErrInvokeCallableNotMethod, [Name]);

  method := PMethod(aCallable.GetReferenceToRawData);

  { by using a pointer we can also use this for non-class instance methods }
  TValue.Make(@method^.Data, PTypeInfo(TypeInfo(Pointer)), inst);

  Result := Rtti.Invoke(Name, method^.Code, CallingConvention, False, inst, aArgs, GetParameters(True), ReturnType);
end;

{ TRttiProcedureType }

function TRttiProcedureType.GetParameters(aWithHidden: Boolean): specialize TArray<TRttiParameter>;
var
  visible, i: SizeInt;
  param: PProcedureParam;
  obj: TRttiObject;
  context: TRttiContext;
begin
  if aWithHidden and (Length(FParamsAll) > 0) then
    Exit(FParamsAll);
  if not aWithHidden and (Length(FParams) > 0) then
    Exit(FParams);

  if FTypeData^.ProcSig.ParamCount = 0 then
    Exit(Nil);

  SetLength(FParamsAll, FTypeData^.ProcSig.ParamCount);
  SetLength(FParams, FTypeData^.ProcSig.ParamCount);

  context := TRttiContext.Create;
  try
    param := AlignTypeData(PProcedureParam(@FTypeData^.ProcSig.ParamCount + SizeOf(FTypeData^.ProcSig.ParamCount)));
    visible := 0;
    for i := 0 to FTypeData^.ProcSig.ParamCount - 1 do begin
      obj := context.GetByHandle(param);
      if Assigned(obj) then
        FParamsAll[i] := obj as TRttiMethodTypeParameter
      else begin
        FParamsAll[i] := TRttiMethodTypeParameter.Create(param, param^.Name, param^.ParamFlags, param^.ParamType);
        context.AddObject(FParamsAll[i]);
      end;

      if not (pfHidden in param^.ParamFlags) then begin
        FParams[visible] := FParamsAll[i];
        Inc(visible);
      end;

      param := PProcedureParam(AlignTypeData(PByte(@param^.Name) + Length(param^.Name) + SizeOf(param^.Name[0])));
    end;

    SetLength(FParams, visible);
  finally
    context.Free;
  end;

  if aWithHidden then
    Result := FParamsAll
  else
    Result := FParams;
end;

function TRttiProcedureType.GetCallingConvention: TCallConv;
begin
  Result := FTypeData^.ProcSig.CC;
end;

function TRttiProcedureType.GetReturnType: TRttiType;
var
  context: TRttiContext;
begin
  if not Assigned(FTypeData^.ProcSig.ResultTypeRef) then
    Exit(Nil);

  context := TRttiContext.Create;
  try
    Result := context.GetType(FTypeData^.ProcSig.ResultTypeRef^);
  finally
    context.Free;
  end;
end;

function TRttiProcedureType.GetFlags: TFunctionCallFlags;
begin
  Result := [fcfStatic];
end;

function TRttiProcedureType.Invoke(const aCallable: TValue; const aArgs: array of TValue): TValue;
begin
  if aCallable.Kind <> tkProcVar then
    raise EInvocationError.CreateFmt(SErrInvokeCallableNotProc, [Name]);

  Result := Rtti.Invoke(Name, PCodePointer(aCallable.GetReferenceToRawData)^, CallingConvention, True, TValue.Empty, aArgs, GetParameters(True), ReturnType);
end;

{ TRttiStringType }

function TRttiStringType.GetStringKind: TRttiStringKind;
begin
  case TypeKind of
    tkSString : result := skShortString;
    tkLString : result := skAnsiString;
    tkAString : result := skAnsiString;
    tkUString : result := skUnicodeString;
    tkWString : result := skWideString;
  end;
end;

{ TRttiInterfaceType }

function TRttiInterfaceType.IntfMethodCount: Word;
var
  parent: TRttiInterfaceType;
  table: PIntfMethodTable;
begin
  parent := GetIntfBaseType;
  if Assigned(parent) then
    Result := parent.IntfMethodCount
  else
    Result := 0;

  table := MethodTable;
  if Assigned(table) then
    Inc(Result, table^.Count);
end;

function TRttiInterfaceType.GetBaseType: TRttiType;
begin
  Result := GetIntfBaseType;
end;

function TRttiInterfaceType.GetGUIDStr: String;
begin
  Result := GUIDToString(GUID);
end;

function TRttiInterfaceType.GetDeclaredMethods: specialize TArray<TRttiMethod>;
var
  methtable: PIntfMethodTable;
  count, index: Word;
  method: PIntfMethodEntry;
  context: TRttiContext;
  obj: TRttiObject;
  parent: TRttiInterfaceType;
  parentmethodcount: Word;
begin
  if Assigned(fDeclaredMethods) then
    Exit(fDeclaredMethods);

  methtable := MethodTable;
  if not Assigned(methtable) then
    Exit(Nil);

  if (methtable^.Count = 0) or (methtable^.RTTICount = $ffff) then
    Exit(Nil);

  parent := GetIntfBaseType;
  if Assigned(parent) then
    parentmethodcount := parent.IntfMethodCount
  else
    parentmethodcount := 0;

  SetLength(fDeclaredMethods, methtable^.Count);

  context := TRttiContext.Create;
  try
    method := methtable^.Method[0];
    count := methtable^.Count;
    while count > 0 do begin
      index := methtable^.Count - count;
      obj := context.GetByHandle(method);
      if Assigned(obj) then
        fDeclaredMethods[index] := obj as TRttiMethod
      else begin
        fDeclaredMethods[index] := TRttiIntfMethod.Create(Self, method, parentmethodcount + index);
        context.AddObject(fDeclaredMethods[index]);
      end;

      method := method^.Next;
      Dec(count);
    end;
  finally
    context.Free;
  end;

  Result := fDeclaredMethods;
end;

{ TRttiInstanceType }

function TRttiInstanceType.GetMetaClassType: TClass;
begin
  result := FTypeData^.ClassType;
end;

function TRttiInstanceType.GetDeclaringUnitName: string;
begin
  result := FTypeData^.UnitName;
end;

function TRttiInstanceType.GetBaseType: TRttiType;
var
  AContext: TRttiContext;
begin
  AContext := TRttiContext.Create;
  try
    result := AContext.GetType(FTypeData^.ParentInfo);
  finally
    AContext.Free;
  end;
end;

function TRttiInstanceType.GetIsInstance: boolean;
begin
  Result:=True;
end;

function TRttiInstanceType.GetTypeSize: integer;
begin
  Result:=sizeof(TObject);
end;

function TRttiInstanceType.GetProperties: specialize TArray<TRttiProperty>;
var
  TypeInfo: PTypeInfo;
  TypeRttiType: TRttiType;
  TD: PTypeData;
  PPD: PPropData;
  TP: PPropInfo;
  Count: longint;
  obj: TRttiObject;
begin
  if not FPropertiesResolved then
    begin
      TypeInfo := FTypeInfo;

      // Get the total properties count
      SetLength(FProperties,FTypeData^.PropCount);
      TypeRttiType:= self;
      repeat
        TD:=GetTypeData(TypeInfo);

        // published properties count for this object
        // skip the attribute-info if available
        PPD := PClassData(TD)^.PropertyTable;
        Count:=PPD^.PropCount;
        // Now point TP to first propinfo record.
        TP:=PPropInfo(@PPD^.PropList);
        While Count>0 do
          begin
            // Don't overwrite properties with the same name
            if FProperties[TP^.NameIndex]=nil then begin
              obj := GRttiPool.GetByHandle(TP);
              if Assigned(obj) then
                FProperties[TP^.NameIndex] := obj as TRttiProperty
              else begin
                FProperties[TP^.NameIndex] := TRttiProperty.Create(TypeRttiType, TP);
                GRttiPool.AddObject(FProperties[TP^.NameIndex]);
              end;
            end;

            // Point to TP next propinfo record.
            // Located at Name[Length(Name)+1] !
            TP:=TP^.Next;
            Dec(Count);
          end;
        TypeInfo:=TD^.Parentinfo;
        TypeRttiType:= GRttiPool.GetType(TypeInfo);
      until TypeInfo=nil;
    end;

  result := FProperties;
end;

{ TRttiMember }

function TRttiMember.GetVisibility: TMemberVisibility;
begin
  result := mvPublished;
end;

constructor TRttiMember.Create(AParent: TRttiType);
begin
  inherited Create();
  FParent := AParent;
end;

{ TRttiProperty }

function TRttiProperty.GetPropertyType: TRttiType;
begin
  result := GRttiPool.GetType(FPropInfo^.PropType);
end;

function TRttiProperty.GetIsReadable: boolean;
begin
  result := assigned(FPropInfo^.GetProc);
end;

function TRttiProperty.GetIsWritable: boolean;
begin
  result := assigned(FPropInfo^.SetProc);
end;

function TRttiProperty.GetVisibility: TMemberVisibility;
begin
  // At this moment only pulished rtti-property-info is supported by fpc
  result := mvPublished;
end;

function TRttiProperty.GetName: string;
begin
  Result:=FPropInfo^.Name;
end;

function TRttiProperty.GetHandle: Pointer;
begin
  Result := FPropInfo;
end;

constructor TRttiProperty.Create(AParent: TRttiType; APropInfo: PPropInfo);
begin
  inherited Create(AParent);
  FPropInfo := APropInfo;
end;

function TRttiProperty.GetValue(Instance: pointer): TValue;

  procedure ValueFromBool(value: Int64);
  var
    b8: Boolean;
    b16: Boolean16;
    b32: Boolean32;
    bb: ByteBool;
    bw: WordBool;
    bl: LongBool;
    td: PTypeData;
    p: Pointer;
  begin
    td := GetTypeData(FPropInfo^.PropType);
    case td^.OrdType of
      otUByte:
        begin
          b8 := Boolean(value);
          p := @b8;
        end;
      otUWord:
        begin
          b16 := Boolean16(value);
          p := @b16;
        end;
      otULong:
        begin
          b32 := Boolean32(value);
          p := @b32;
        end;
      otSByte:
        begin
          bb := ByteBool(value);
          p := @bb;
        end;
      otSWord:
        begin
          bw := WordBool(value);
          p := @bw;
        end;
      otSLong:
        begin
          bl := LongBool(value);
          p := @bl;
        end;
    end;
    TValue.Make(p, FPropInfo^.PropType, result);
  end;

  procedure ValueFromInt(value: Int64);
  var
    i8: UInt8;
    i16: UInt16;
    i32: UInt32;
    td: PTypeData;
    p: Pointer;
  begin
    td := GetTypeData(FPropInfo^.PropType);
    case td^.OrdType of
      otUByte,
      otSByte:
        begin
          i8 := value;
          p := @i8;
        end;
      otUWord,
      otSWord:
        begin
          i16 := value;
          p := @i16;
        end;
      otULong,
      otSLong:
        begin
          i32 := value;
          p := @i32;
        end;
    end;
    TValue.Make(p, FPropInfo^.PropType, result);
  end;

var
  s: string;
  ss: ShortString;
  i: int64;
  c: Char;
  wc: WideChar;
begin
  case FPropinfo^.PropType^.Kind of
    tkSString:
      begin
        ss := GetStrProp(TObject(Instance), FPropInfo);
        TValue.Make(@ss, FPropInfo^.PropType, result);
      end;
    tkAString:
      begin
        s := GetStrProp(TObject(Instance), FPropInfo);
        TValue.Make(@s, FPropInfo^.PropType, result);
      end;
    tkBool:
      begin
        i := GetOrdProp(TObject(Instance), FPropInfo);
        ValueFromBool(i);
      end;
    tkInteger:
      begin
        i := GetOrdProp(TObject(Instance), FPropInfo);
        ValueFromInt(i);
      end;
    tkChar:
      begin
        c := AnsiChar(GetOrdProp(TObject(Instance), FPropInfo));
        TValue.Make(@c, FPropInfo^.PropType, result);
      end;
    tkWChar:
      begin
        wc := WideChar(GetOrdProp(TObject(Instance), FPropInfo));
        TValue.Make(@wc, FPropInfo^.PropType, result);
      end;
    tkInt64,
    tkQWord:
      begin
        i := GetOrdProp(TObject(Instance), FPropInfo);
        TValue.Make(@i, FPropInfo^.PropType, result);
      end;
  else
    result := TValue.Empty;
  end
end;

procedure TRttiProperty.SetValue(Instance: pointer; const AValue: TValue);
begin
  case FPropinfo^.PropType^.Kind of
    tkSString,
    tkAString:
      SetStrProp(TObject(Instance), FPropInfo, AValue.AsString);
    tkInteger,
    tkInt64,
    tkQWord,
    tkChar,
    tkBool,
    tkWChar:
      SetOrdProp(TObject(Instance), FPropInfo, AValue.AsOrdinal);
  else
    raise exception.createFmt(SErrUnableToSetValueForType, [PropertyType.Name]);
  end
end;

function TRttiType.GetIsInstance: boolean;
begin
  result := false;
end;

function TRttiType.GetIsManaged: boolean;
begin
  result := Rtti.IsManaged(FTypeInfo);
end;

function TRttiType.GetIsOrdinal: boolean;
begin
  result := false;
end;

function TRttiType.GetIsRecord: boolean;
begin
  result := false;
end;
function TRttiType.GetIsSet: boolean;

begin
  result := false;
end;

function TRttiType.GetAsInstance: TRttiInstanceType;
begin
  // This is a ridicoulous design, but Delphi-compatible...
  result := TRttiInstanceType(self);
end;

function TRttiType.GetBaseType: TRttiType;
begin
  result := nil;
end;

function TRttiType.GetTypeKind: TTypeKind;
begin
  result := FTypeInfo^.Kind;
end;

function TRttiType.GetTypeSize: integer;
begin
  result := -1;
end;

function TRttiType.GetName: string;
begin
  Result:=FTypeInfo^.Name;
end;

function TRttiType.GetHandle: Pointer;
begin
  Result := FTypeInfo;
end;

constructor TRttiType.Create(ATypeInfo: PTypeInfo);
begin
  inherited Create();
  FTypeInfo:=ATypeInfo;
  if assigned(FTypeInfo) then
    FTypeData:=GetTypeData(ATypeInfo);
end;

function TRttiType.GetProperties: specialize TArray<TRttiProperty>;
begin
  Result := Nil;
end;

function TRttiType.GetProperty(const AName: string): TRttiProperty;
var
  FPropList: specialize TArray<TRttiProperty>;
  i: Integer;
begin
  result := nil;
  FPropList := GetProperties;
  for i := 0 to length(FPropList)-1 do
    if sametext(FPropList[i].Name,AName) then
      begin
        result := FPropList[i];
        break;
      end;
end;

function TRttiType.GetMethods: specialize TArray<TRttiMethod>;
var
  parentmethods, selfmethods: specialize TArray<TRttiMethod>;
  parent: TRttiType;
begin
  if Assigned(fMethods) then
    Exit(fMethods);

  selfmethods := GetDeclaredMethods;

  parent := GetBaseType;
  if Assigned(parent) then begin
    parentmethods := parent.GetMethods;
  end;

  fMethods := Concat(parentmethods, selfmethods);

  Result := fMethods;
end;

function TRttiType.GetMethod(const aName: String): TRttiMethod;
var
  methods: specialize TArray<TRttiMethod>;
  method: TRttiMethod;
begin
  methods := GetMethods;
  for method in methods do
    if SameText(method.Name, AName) then
      Exit(method);
  Result := Nil;
end;

function TRttiType.GetDeclaredMethods: specialize TArray<TRttiMethod>;
begin
  Result := Nil;
end;

{ TRttiNamedObject }

function TRttiNamedObject.GetName: string;
begin
  result := '';
end;

{ TRttiContext }

class function TRttiContext.Create: TRttiContext;
begin
  result.FContextToken := nil;
end;

procedure TRttiContext.Free;
begin
  FContextToken := nil;
end;

function TRttiContext.GetByHandle(AHandle: Pointer): TRttiObject;
begin
  if not Assigned(FContextToken) then
    FContextToken := TPoolToken.Create;
  Result := (FContextToken as IPooltoken).RttiPool.GetByHandle(AHandle);
end;

procedure TRttiContext.AddObject(AObject: TRttiObject);
begin
  if not Assigned(FContextToken) then
    FContextToken := TPoolToken.Create;
  (FContextToken as IPooltoken).RttiPool.AddObject(AObject);
end;

function TRttiContext.GetType(ATypeInfo: PTypeInfo): TRttiType;
begin
  if not assigned(FContextToken) then
    FContextToken := TPoolToken.Create;
  result := (FContextToken as IPooltoken).RttiPool.GetType(ATypeInfo);
end;


function TRttiContext.GetType(AClass: TClass): TRttiType;
begin
  if assigned(AClass) then
    result := GetType(PTypeInfo(AClass.ClassInfo))
  else
    result := nil;
end;

{function TRttiContext.GetTypes: specialize TArray<TRttiType>;

begin
  if not assigned(FContextToken) then
    FContextToken := TPoolToken.Create;
  result := (FContextToken as IPooltoken).RttiPool.GetTypes;
end;}

type
  TQueryInterface = function(constref aIID: TGUID; out aObj): LongInt of object;{$IFNDEF WINDOWS}cdecl{$ELSE}stdcall{$ENDIF};
  TAddRef = function: LongInt of object;{$IFNDEF WINDOWS}cdecl{$ELSE}stdcall{$ENDIF};
  TRelease = function: LongInt of object;{$IFNDEF WINDOWS}cdecl{$ELSE}stdcall{$ENDIF};

{ TVirtualInterface }

{.$define DEBUG_VIRTINTF}

constructor TVirtualInterface.Create(aPIID: PTypeInfo);

  function GetIInterfaceMethod(aTypeInfo: PTypeInfo; const aName: String; out aType: TRttiType): TMethodImplementation;
  begin
    aType := fContext.GetType(aTypeInfo);
    if not (aType is TRttiMethodType) then
      raise EInsufficientRtti.Create(SErrVirtIntfIInterface) at get_caller_addr(get_frame), get_caller_frame(get_frame);

    Result := TRttiMethodType(aType).CreateImplementation(@HandleIInterfaceCallback);
    if not Assigned(Result) then
      raise ERtti.CreateFmt(SErrVirtIntfCreateImpl, [aPIID^.Name, aName]) at get_caller_addr(get_frame), get_caller_frame(get_frame);
  end;

var
  t: TRttiType;
  ti: PTypeInfo;
  td: PInterfaceData;
  methods: specialize TArray<TRttiMethod>;
  m: TRttiMethod;
  mt: PIntfMethodTable;
  count, i: SizeInt;
begin
  if not Assigned(aPIID) then
    raise EArgumentNilException.Create(SErrVirtIntfTypeNil);
  { ToDo: add support for raw interfaces once they support RTTI }
  if aPIID^.Kind <> tkInterface then
    raise EArgumentException.CreateFmt(SErrVirtIntfTypeMustBeIntf, [aPIID^.Name]);

  fContext := TRttiContext.Create;
  t := fContext.GetType(aPIID);
  if not Assigned(t) then
    raise EInsufficientRtti.CreateFmt(SErrVirtIntfTypeNotFound, [aPIID^.Name]);

  { check whether the interface and all its parents have RTTI enabled (the only
    exception is IInterface as we know the methods of that) }
  td := PInterfaceData(GetTypeData(aPIID));

  fGUID := td^.GUID;

  ti := aPIID;
  { we have at least the three methods of IInterface }
  count := 3;
  while ti <> TypeInfo(IInterface) do begin
    mt := td^.MethodTable;
    if (mt^.Count > 0) and (mt^.RTTICount <> mt^.Count) then
      raise EInsufficientRtti.CreateFmt(SErrVirtIntfNotAllMethodsRTTI, [aPIID^.Name]);
    Inc(count, mt^.Count);
    ti := td^.Parent^;
    td := PInterfaceData(GetTypeData(ti));
  end;

  SetLength(fImpls, count);

  fImpls[0] := GetIInterfaceMethod(TypeInfo(TQueryInterface), 'QueryInterface', fQueryInterfaceType);
  fImpls[1] := GetIInterfaceMethod(TypeInfo(TAddRef), 'AddRef', fAddRefType);
  fImpls[2] := GetIInterfaceMethod(TypeInfo(TRelease), 'Release', fReleaseType);

  methods := t.GetMethods;
  for m in methods do begin
    if m.VirtualIndex > High(fImpls) then
      raise ERtti.CreateFmt(SErrVirtIntfInvalidVirtIdx, [aPIID^.Name, m.Name]);
    { we use the childmost entry, except for the IInterface methods }
    if Assigned(fImpls[m.VirtualIndex]) then begin
      {$IFDEF DEBUG_VIRTINTF}Writeln('Ignoring duplicate implementation for index ', m.VirtualIndex);{$ENDIF}
      Continue;
    end;
    fImpls[m.VirtualIndex] := m.CreateImplementation(m, @HandleUserCallback);
  end;

  for i := 0 to High(fImpls) do
    if not Assigned(fImpls) then
      raise ERtti.CreateFmt(SErrVirtIntfMethodNil, [aPIID^.Name, i]);

  fVmt := GetMem(Length(fImpls) * SizeOf(CodePointer));
  if not Assigned(fVmt) then
    raise ERtti.CreateFmt(SErrVirtIntfCreateVmt, [aPIID^.Name]);

  for i := 0 to High(fImpls) do begin
    fVmt[i] := fImpls[i].CodeAddress;
    {$IFDEF DEBUG_VIRTINTF}Writeln('VMT ', i, ': ', HexStr(fVmt[i]));{$ENDIF}
  end;
end;

constructor TVirtualInterface.Create(aPIID: PTypeInfo; aInvokeEvent: TVirtualInterfaceInvokeEvent);
begin
  Create(aPIID);
  OnInvoke := aInvokeEvent;
end;

destructor TVirtualInterface.Destroy;
var
  impl: TMethodImplementation;
begin
  {$IFDEF DEBUG_VIRTINTF}Writeln('Freeing implementations');{$ENDIF}
  for impl in fImpls do
    impl.Free;
  {$IFDEF DEBUG_VIRTINTF}Writeln('Freeing VMT');{$ENDIF}
  if Assigned(fVmt) then
    FreeMem(fVmt);
  {$IFDEF DEBUG_VIRTINTF}Writeln('Freeing Context');{$ENDIF}
  fContext.Free;
  {$IFDEF DEBUG_VIRTINTF}Writeln('Done');{$ENDIF}
  inherited Destroy;
end;

function TVirtualInterface.QueryInterface(constref aIID: TGuid; out aObj): LongInt;{$IFNDEF WINDOWS}cdecl{$ELSE}stdcall{$ENDIF};
begin
  {$IFDEF DEBUG_VIRTINTF}Writeln('QueryInterface for ', GUIDToString(aIID));{$ENDIF}
  if IsEqualGUID(aIID, fGUID) then begin
    {$IFDEF DEBUG_VIRTINTF}Writeln('Returning ', HexStr(@fVmt));{$ENDIF}
    Pointer(aObj) := @fVmt;
    { QueryInterface increases the reference count }
    _AddRef;
    Result := S_OK;
  end else
    Result := inherited QueryInterface(aIID, aObj);
end;

procedure TVirtualInterface.HandleIInterfaceCallback(aInvokable: TRttiInvokableType; const aArgs: TValueArray; out aResult: TValue);
var
  res: LongInt;
  guid: TGuid;
begin
  {$IFDEF DEBUG_VIRTINTF}Writeln(aInvokable.Name);{$ENDIF}
  if aInvokable = fQueryInterfaceType then begin
    {$IFDEF DEBUG_VIRTINTF}Writeln('Call for QueryInterface');{$ENDIF}
    Move(aArgs[1].GetReferenceToRawData^, guid, SizeOf(guid));
    res := QueryInterface(guid, PPointer(aArgs[2].GetReferenceToRawData)^);
    TValue.Make(@res, TypeInfo(LongInt), aResult);
  end else if aInvokable = fAddRefType then begin
    {$IFDEF DEBUG_VIRTINTF}Writeln('Call for AddRef');{$ENDIF}
    res := _AddRef;
    TValue.Make(@res, TypeInfo(LongInt), aResult);
  end else if aInvokable = fReleaseType then begin
    {$IFDEF DEBUG_VIRTINTF}Writeln('Call for Release');{$ENDIF}
    res := _Release;
    TValue.Make(@res, TypeInfo(LongInt), aResult);
  end;
end;

procedure TVirtualInterface.HandleUserCallback(aUserData: Pointer; const aArgs: TValueArray; out aResult: TValue);
begin
  {$IFDEF DEBUG_VIRTINTF}Writeln('Call for ', TRttiMethod(aUserData).Name);{$ENDIF}
  if Assigned(fOnInvoke) then
    fOnInvoke(TRttiMethod(aUserData), aArgs, aResult);
end;

{$ifndef InLazIDE}
{$if defined(CPUI386) or (defined(CPUX86_64) and defined(WIN64))}
{$I invoke.inc}
{$endif}
{$endif}

initialization
  PoolRefCount := 0;
  InitDefaultFunctionCallManager;
{$ifdef SYSTEM_HAS_INVOKE}
  InitSystemFunctionCallManager;
{$endif}
end.