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harbour-core/harbour/source/rtl/tclass.prg
Przemyslaw Czerpak 1202be4471 2006-09-22 23:00 UTC+0200 Przemyslaw Czerpak (druzus/at/priv.onet.pl) 
* harbour/include/hbclass.ch
  * harbour/include/hbvm.h
  * harbour/source/rtl/tclass.prg
  * harbour/source/vm/classes.c
  * harbour/source/vm/hvm.c
    ! fixed bug in real codeblock scoping which was exploited by
      dictionary resizing
    * changed ACCESS messages to ASSIGN ones when object item
      reference is created for proper READONLY scope checking.
      The reference to object variable can be created only when
      caller has sufficient ASSIGN privileges.
    + added FRIEND CLASS and FRIEND FUNCTION support.
      It's enough to add class definition:
         FRIEND CLASS <classFunc1> [, <classFuncN> ]
      and/or:
         FRIEND FUNCTION <FuncName1> [, <FuncNameN> ]
      and all methods of given class or given function will be able
      to access private variables.
      Warning!!! Friends cannot access overloaded non virtual methods.
                 This feature is available _ONLY_ for real class members.
    + added MODULE FRIENDLY to class definition. It causes that all other
      functions and classes defined in the same .prg module will have
      friend privileges. In such way works xHarbour and there is now way
      to disable this "feature" what is IMHO bug. In Harbour programmer
      has to explicitly enable it (until he will not change / add new
      preprocessor rule and set it as default ;-)). Syntax:
         CREATE CLASS .... MODULE FRIENDLY
            ...
         END CLASS

  * harbour/source/vm/proc.c
  * harbour/source/vm/runner.c
    * updated function symbols processing

  * harbour/source/compiler/harbour.c
    * added note in hb_compOptimizeFrames() about exceeding maximum number
      of local variables (255). We should add new pcode(s) HB_P_LARGE[V]FRAME
      or generate compile time error.

  * harbour/source/vm/macro.c
    % minor optimizations
2006-09-22 21:02:17 +00:00

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/*
* $Id$
*/
/*
* Harbour Project source code:
* Base Class for internal handling of class creation
*
* Copyright 1999 Antonio Linares <alinares@fivetech.com>
* www - http://www.harbour-project.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* 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. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
*
* As a special exception, the Harbour Project gives permission for
* additional uses of the text contained in its release of Harbour.
*
* The exception is that, if you link the Harbour libraries with other
* files to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the Harbour library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the Harbour
* Project under the name Harbour. If you copy code from other
* Harbour Project or Free Software Foundation releases into a copy of
* Harbour, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for Harbour, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice.
*
*/
/*
* The following parts are Copyright of the individual authors.
* www - http://www.harbour-project.org
*
* Copyright 2000 J. Lefebvre <jfl@mafact.com> & RA. Cuylen <rac@mafact.com>
* Multiple inheritance
* Support shared class DATA
* scoping (hidden, protected, readOnly)
* Use of __cls_param function to allow multiple superclass declaration
* Suppress of SetType and SetInit not more nedded
* Delegation and forwarding
* Preparing the InitClass class method (not working !! )
*
* Copyright 1999 Eddie Runia <eddie@runia.com>
* Support for inheritance
* Support for default DATA values
*
* See doc/license.txt for licensing terms.
*
*/
// Harbour Class HBClass to build classes
#include "common.ch"
#include "hboo.ch"
REQUEST HBObject
FUNCTION HBClass()
STATIC s_hClass /* NOTE: Automatically default to NIL */
IF s_hClass == NIL
s_hClass := __clsNew( "HBCLASS", 15)
/* s_hClass := __clsNew( "HBCLASS", 16) */
__clsAddMsg( s_hClass, "New" , @New() , HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "Create" , @Create() , HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "AddData" , @AddData() , HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "AddMultiData" , @AddMultiData() , HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "AddClassData" , @AddClassData() , HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "AddMultiClsData", @AddMultiClsData(), HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "AddInline" , @AddInline() , HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "AddMethod" , @AddMethod() , HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "AddClsMethod" , @AddClsMethod() , HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "AddVirtual" , @AddVirtual() , HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "AddFriendFunc" , @AddFriendFunc() , HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "AddFriendClass" , @AddFriendClass() , HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "Instance" , @Instance() , HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "SetOnError" , @SetOnError() , HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "SetDestructor" , @SetDestructor() , HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "InitClass" , @InitClass() , HB_OO_MSG_METHOD )
__clsAddMsg( s_hClass, "cSuper" , {| Self | iif( ::acSuper == NIL .OR. Len( ::acSuper ) == 0, NIL, ::acSuper[ 1 ] ) }, HB_OO_MSG_INLINE )
__clsAddMsg( s_hClass, "_cSuper" , {| Self, xVal | iif( ::acSuper == NIL .OR. Len( ::acSuper ) == 0, ( ::acSuper := { xVal } ), ::acSuper[ 1 ] := xVal ), xVal }, HB_OO_MSG_INLINE )
__clsAddMsg( s_hClass, "hClass" , 1, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_hClass" , 1, HB_OO_MSG_ASSIGN )
__clsAddMsg( s_hClass, "cName" , 2, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_cName" , 2, HB_OO_MSG_ASSIGN )
__clsAddMsg( s_hClass, "aDatas" , 3, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_aDatas" , 3, HB_OO_MSG_ASSIGN )
__clsAddMsg( s_hClass, "aMethods" , 4, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_aMethods" , 4, HB_OO_MSG_ASSIGN )
__clsAddMsg( s_hClass, "aClsDatas" , 5, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_aClsDatas" , 5, HB_OO_MSG_ASSIGN )
__clsAddMsg( s_hClass, "aClsMethods" , 6, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_aClsMethods" , 6, HB_OO_MSG_ASSIGN )
__clsAddMsg( s_hClass, "aInlines" , 7, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_aInlines" , 7, HB_OO_MSG_ASSIGN )
__clsAddMsg( s_hClass, "aVirtuals" , 8, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_aVirtuals" , 8, HB_OO_MSG_ASSIGN )
__clsAddMsg( s_hClass, "acSuper" , 9, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_acSuper" , 9, HB_OO_MSG_ASSIGN )
__clsAddMsg( s_hClass, "nOnError" , 10, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_nOnError" , 10, HB_OO_MSG_ASSIGN )
__clsAddMsg( s_hClass, "nDestructor" , 11, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_nDestructor" , 11, HB_OO_MSG_ASSIGN )
__clsAddMsg( s_hClass, "lModFriendly" , 12, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_lModFriendly" , 12, HB_OO_MSG_ASSIGN )
__clsAddMsg( s_hClass, "asFriendClass" , 13, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_asFriendClass" , 13, HB_OO_MSG_ASSIGN )
__clsAddMsg( s_hClass, "asFriendFunc" , 14, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_asFriendFunc" , 14, HB_OO_MSG_ASSIGN )
__clsAddMsg( s_hClass, "sClassFunc" , 15, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_sClassFunc" , 15, HB_OO_MSG_ASSIGN )
/* __clsAddMsg( s_hClass, "class" , 16, HB_OO_MSG_ACCESS )
__clsAddMsg( s_hClass, "_class" , 16, HB_OO_MSG_ASSIGN ) */
ENDIF
RETURN __clsInst( s_hClass )
//----------------------------------------------------------------------------//
// xSuper is used here as the new preprocessor file (HBCLASS.CH) send here
// always an array (if no superclass, this will be an empty one)
// In case of direct class creation (without the help of preprocessor) xSuper can be
// either NIL or contain the name of the superclass.
STATIC FUNCTION New( cClassName, xSuper, sClassFunc, lModuleFriendly )
LOCAL Self := QSelf()
LOCAL nSuper, i
IF ISARRAY( xSuper ) .AND. Len( xSuper ) >= 1
::acSuper := xSuper
nSuper := Len( xSuper )
ELSEIF ISCHARACTER( xSuper ) .AND. ! empty( xSuper )
::acSuper := { xSuper }
nSuper := 1
ELSE
::acSuper := {}
nSuper := 0
ENDIF
::cName := Upper( cClassName )
::sClassFunc := sClassFunc
::aDatas := {}
::aMethods := {}
::aClsDatas := {}
::aClsMethods := {}
::aInlines := {}
::aVirtuals := {}
::asFriendClass := {}
::asFriendFunc := {}
IF ISLOGICAL( lModuleFriendly )
::lModFriendly := lModuleFriendly
ELSE
::lModFriendly := .F.
ENDIF
FOR i := 1 TO nSuper
IF ! ISCHARACTER( ::acSuper[ i ] )
EXIT
ENDIF
NEXT
IF i <= nSuper
nSuper := i - 1
ASize( ::acSuper, nSuper)
ENDIF
RETURN QSelf()
//----------------------------------------------------------------------------//
/* STATIC PROCEDURE Create(MetaClass) */
STATIC PROCEDURE Create()
LOCAL Self := QSelf()
LOCAL n
LOCAL nLen
LOCAL nLenDatas := Len( ::aDatas ) //Datas local to the class !!
LOCAL nClassBegin
LOCAL hClass
LOCAL ahSuper := {}
/* Self:Class := MetaClass */
nLen := Len( ::acSuper )
FOR n := 1 TO nLen
hClass := __clsInstSuper( Upper( ::acSuper[ n ] ) ) // Super handle available
IF hClass != 0
AAdd( ahSuper, hClass )
ENDIF
NEXT
hClass := __clsNew( ::cName, nLenDatas, ahSuper, ::sClassFunc, ::lModFriendly )
::hClass := hClass
IF !EMPTY( ahSuper )
IF ahSuper[ 1 ] != 0
__clsAddMsg( hClass, "SUPER" , 0, HB_OO_MSG_SUPER, ahSuper[ 1 ], HB_OO_CLSTP_EXPORTED )
__clsAddMsg( hClass, "__SUPER", 0, HB_OO_MSG_SUPER, ahSuper[ 1 ], HB_OO_CLSTP_EXPORTED )
ENDIF
ENDIF
__clsAddMsg( hClass, "REALCLASS" , 0, HB_OO_MSG_REALCLASS, 0 , HB_OO_CLSTP_EXPORTED )
// We will work here on the MetaClass object to add the Class Method
// as needed
//nLen := Len( ::aClsMethods )
//FOR n := 1 TO nLen
// // do it
//NEXT
////
//Local message...
FOR n := 1 TO nLenDatas
__clsAddMsg( hClass, ::aDatas[ n ][ HB_OO_DATA_SYMBOL ] , n, ;
HB_OO_MSG_ACCESS, ::aDatas[ n ][ HB_OO_DATA_VALUE ], ::aDatas[ n ][ HB_OO_DATA_SCOPE ],;
::aDatas[ n ][ HB_OO_DATA_PERSISTENT ] )
__clsAddMsg( hClass, "_" + ::aDatas[ n ][ HB_OO_DATA_SYMBOL ] , n, ;
HB_OO_MSG_ASSIGN, , ::aDatas[ n ][ HB_OO_DATA_SCOPE ] )
NEXT
nLen := Len( ::aMethods )
FOR n := 1 TO nLen
__clsAddMsg( hClass, ::aMethods[ n ][ HB_OO_MTHD_SYMBOL ], ::aMethods[ n ][ HB_OO_MTHD_PFUNCTION ], HB_OO_MSG_METHOD, NIL, ::aMethods[ n ][ HB_OO_MTHD_SCOPE ],;
::aMethods[ n ][ HB_OO_MTHD_PERSISTENT ] )
NEXT
nLen := Len( ::aClsDatas )
nClassBegin := __CLS_CNTCLSDATA( hClass )
FOR n := 1 TO nLen
__clsAddMsg( hClass, ::aClsDatas[ n ][ HB_OO_CLSD_SYMBOL ] , n + nClassBegin,;
HB_OO_MSG_CLSACCESS, ::aClsDatas[ n ][ HB_OO_CLSD_VALUE ], ::aClsDatas[ n ][ HB_OO_CLSD_SCOPE ] )
__clsAddMsg( hClass, "_" + ::aClsDatas[ n ][ HB_OO_CLSD_SYMBOL ], n + nClassBegin,;
HB_OO_MSG_CLSASSIGN, , ::aClsDatas[ n ][ HB_OO_CLSD_SCOPE ] )
NEXT
nLen := Len( ::aInlines )
FOR n := 1 TO nLen
__clsAddMsg( hClass, ::aInlines[ n ][ HB_OO_MTHD_SYMBOL ], ::aInlines[ n ][ HB_OO_MTHD_PFUNCTION ],;
HB_OO_MSG_INLINE, NIL, ::aInlines[ n ][ HB_OO_MTHD_SCOPE ],;
::aInlines[ n ][ HB_OO_MTHD_PERSISTENT ] )
NEXT
nLen := Len( ::aVirtuals )
FOR n := 1 TO nLen
__clsAddMsg( hClass, ::aVirtuals[ n ], n, HB_OO_MSG_VIRTUAL )
NEXT
IF ::nOnError != NIL
__clsAddMsg( hClass, "__OnError", ::nOnError, HB_OO_MSG_ONERROR )
ENDIF
IF ::nDestructor != NIL
__clsAddMsg( hClass, "__Destructor", ::nDestructor, HB_OO_MSG_DESTRUCTOR )
ENDIF
//Friend Classes
nLen := Len( ::asFriendClass )
FOR n := 1 TO nLen
__clsAddFriend( ::hClass, ::asFriendClass[ n ] )
NEXT
//Friend Functions
nLen := Len( ::asFriendFunc )
FOR n := 1 TO nLen
__clsAddFriend( ::hClass, ::asFriendFunc[ n ] )
NEXT
RETURN
//----------------------------------------------------------------------------//
STATIC FUNCTION Instance()
LOCAL Self := QSelf()
Local oInstance := __clsInst( ::hClass )
/*oInstance:Class := Self:Class*/
RETURN oInstance
//----------------------------------------------------------------------------//
STATIC PROCEDURE AddData( cData, xInit, cType, nScope, lNoinit, lPersistent )
LOCAL Self := QSelf()
if lNoInit==NIL;lNoInit:=.F.;endif
if lPersistent == nil; lpersistent := .f.; endif
// Default Init for Logical and numeric
IF ! lNoInit .AND. cType != NIL .AND. xInit == NIL
IF Upper( Left( cType, 1 ) ) == "L"
xInit := .F.
ELSEIF Upper( Left( cType, 1 ) ) $ "NI" /* Numeric Int */
xInit := 0
ENDIF
ENDIF
AAdd( ::aDatas, { cData, xInit, cType, nScope, lPersistent } )
RETURN
//----------------------------------------------------------------------------//
STATIC PROCEDURE AddMultiData( cType, xInit, nScope, aData, lNoInit, lPersistent )
LOCAL Self := QSelf()
LOCAL i
LOCAL nParam := Len( aData )
FOR i := 1 TO nParam
IF ! ISCHARACTER( aData[ i ] )
EXIT
ENDIF
NEXT
IF i < nParam
nParam := i - 1
ASize( aData, nParam )
ENDIF
FOR i := 1 TO nParam
::AddData( aData[ i ], xInit, cType, nScope, lNoInit, lPersistent )
NEXT
RETURN
//----------------------------------------------------------------------------//
STATIC PROCEDURE AddClassData( cData, xInit, cType, nScope, lNoInit )
LOCAL Self := QSelf()
if lNoInit==NIL;lNoInit:=.F.;endif
// Default Init for Logical and numeric
IF ! lNoInit .AND. cType != NIL .AND. xInit == NIL
IF Upper( Left( cType, 1 ) ) == "L"
xInit := .F.
ELSEIF Upper( Left( cType, 1 ) ) $ "NI" /* Numeric Int */
xInit := 0
ENDIF
ENDIF
AAdd( ::aClsDatas, { cData, xInit, cType, nScope } )
RETURN
//----------------------------------------------------------------------------//
STATIC PROCEDURE AddMultiClsData( cType, xInit, nScope, aData, lNoInit )
LOCAL Self := QSelf()
LOCAL i
LOCAL nParam := Len( aData )
FOR i := 1 TO nParam
IF ! ISCHARACTER( aData[ i ] )
EXIT
ENDIF
NEXT
IF i < nParam
nParam := i - 1
ASize( aData, nParam )
ENDIF
FOR i := 1 TO nParam
::AddClassData( aData[ i ], xInit, cType, nScope, lNoInit )
NEXT
RETURN
//----------------------------------------------------------------------------//
STATIC PROCEDURE AddInline( cMethod, bCode, nScope, lPersistent )
LOCAL Self := QSelf(), nAt
/* Remove possible ( <x,...> )*/
IF ( nAt := At( "(", cMethod ) ) > 0
cMethod := RTrim( Left( cMethod, nAt - 1 ) )
ENDIF
AAdd( ::aInlines, { cMethod, bCode, nScope, lPersistent } )
RETURN
//----------------------------------------------------------------------------//
STATIC PROCEDURE AddMethod( cMethod, nFuncPtr, nScope, lPersistent )
LOCAL Self := QSelf(), nAt
/* Remove possible ( <x,...> )*/
IF ( nAt := At( "(", cMethod ) ) > 0
cMethod := RTrim( Left( cMethod, nAt - 1 ) )
ENDIF
AAdd( ::aMethods, { cMethod, nFuncPtr, nScope, lPersistent } )
RETURN
//----------------------------------------------------------------------------//
STATIC PROCEDURE AddClsMethod( cMethod, nFuncPtr, nScope )
LOCAL Self := QSelf(), nAt
/* Remove possible ( <x,...> )*/
IF ( nAt := At( "(", cMethod ) ) > 0
cMethod := RTrim( Left( cMethod, nAt - 1 ) )
ENDIF
AAdd( ::aClsMethods, { cMethod, nFuncPtr, nScope } )
RETURN
//----------------------------------------------------------------------------//
STATIC PROCEDURE AddVirtual( cMethod )
LOCAL Self := QSelf(), nAt
/* Remove possible ( <x,...> )*/
IF ( nAt := At( "(", cMethod ) ) > 0
cMethod := RTrim( Left( cMethod, nAt - 1 ) )
ENDIF
AAdd( ::aVirtuals, cMethod )
RETURN
//----------------------------------------------------------------------------//
STATIC PROCEDURE AddFriendClass( ... )
LOCAL Self := QSelf()
AEval( HB_AParams(), { | sClass | AAdd( ::asFriendClass, sClass ) } )
RETURN
//----------------------------------------------------------------------------//
STATIC PROCEDURE AddFriendFunc( ... )
LOCAL Self := QSelf()
AEval( HB_AParams(), { | sFunc | AAdd( ::asFriendFunc, sFunc ) } )
RETURN
//----------------------------------------------------------------------------//
STATIC PROCEDURE SetOnError( nFuncPtr )
LOCAL Self := QSelf()
::nOnError := nFuncPtr
RETURN
STATIC PROCEDURE SetDestructor( nFuncPtr )
LOCAL Self := QSelf()
::nDestructor := nFuncPtr
RETURN
//----------------------------------------------------------------------------//
STATIC FUNCTION InitClass()
LOCAL Self := QSelf()
RETURN Self
//----------------------------------------------------------------------------//
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