065a119f51
* harbour/include/hbapicls.h
* harbour/source/vm/codebloc.c
* harbour/source/vm/proc.c
* harbour/source/vm/classes.c
+ added support for messages in PROCFILE()
* modified PROCFILE() and HB_METHODNAME() output - PROCFILE()
should be fully Clipper compatible and HB_METHODNAME() works
in a little bit different way for evaluated codeblocks created
in methods or associated with method and returns (b)<class>:<msg>
instead of (b)<method> so the output is more similar to xHarbour.
* harbour/contrib/gtwvg/gtwvg.h
! disabled NONAMELESSUNION - wvgwin.c uses TVINSERTSTRUCT item
member without union name what breaks MINGW compilation
* added hardcoded TVIS_EXPANDPARTIAL when it does not exist
in header files - MINGW 3.4 does not have it.
315 lines
10 KiB
C
315 lines
10 KiB
C
/*
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* $Id$
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*/
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/*
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* Harbour Project source code:
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* Codeblock runtime support
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*
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* Copyright 1999 Ryszard Glab <rglab@imid.med.pl>
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* www - http://www.harbour-project.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
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*
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* As a special exception, the Harbour Project gives permission for
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* additional uses of the text contained in its release of Harbour.
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*
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* The exception is that, if you link the Harbour libraries with other
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* files to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the Harbour library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the Harbour
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* Project under the name Harbour. If you copy code from other
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* Harbour Project or Free Software Foundation releases into a copy of
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* Harbour, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for Harbour, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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*
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*/
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/* The Harbour implementation of codeblocks */
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#include "hbvmopt.h"
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#include "hbapi.h"
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#include "hbapiitm.h"
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#include "hbapicls.h"
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#include "hbvm.h"
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#include "hbstack.h"
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#include "hbpcode.h"
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/* Dummy returning NIL for buggy code which may store references
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to freed by GC codeblock in .prg destructors and then (after
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catching RT EG_DESTRUCTOR error) try to execute them
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*/
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static const BYTE s_pCode[ 2 ] = { HB_P_PUSHNIL, HB_P_ENDBLOCK };
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/* Release all allocated memory when called from the garbage collector
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*/
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static HB_GARBAGE_FUNC( hb_codeblockDeleteGarbage )
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{
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HB_CODEBLOCK_PTR pCBlock = ( HB_CODEBLOCK_PTR ) Cargo;
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HB_TRACE(HB_TR_DEBUG, ("hb_codeblockDeleteGarbage(%p)", Cargo));
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/* free space allocated for pcodes - if it was a macro-compiled codeblock
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*/
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if( pCBlock->pCode && pCBlock->dynBuffer )
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{
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pCBlock->dynBuffer = FALSE;
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hb_xfree( pCBlock->pCode );
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}
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pCBlock->pCode = ( BYTE * ) s_pCode;
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/* free space allocated for local variables
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*/
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if( pCBlock->pLocals )
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{
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PHB_ITEM pLocals = pCBlock->pLocals;
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USHORT uiLocals = pCBlock->uiLocals;
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/* clear pCBlock->pLocals to avoid infinit loop in cross
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* referenced items
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*/
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pCBlock->pLocals = NULL;
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pCBlock->uiLocals = 0;
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if( hb_xRefDec( pLocals ) )
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{
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while( uiLocals )
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hb_memvarValueDecRef( pLocals[ uiLocals-- ].item.asMemvar.value );
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hb_xfree( pLocals );
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}
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}
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}
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/* Creates the codeblock structure
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*
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* pBuffer -> the buffer with pcodes (without HB_P_PUSHBLOCK)
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* wLocals -> number of local variables referenced in a codeblock
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* pLocalPosTable -> a table with positions on eval stack for referenced variables
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* pSymbols -> a pointer to the module symbol table
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*
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* Note: pLocalPosTable cannot be used if uiLocals is ZERO
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*
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*/
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HB_CODEBLOCK_PTR hb_codeblockNew( const BYTE * pBuffer,
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USHORT uiLocals,
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const BYTE * pLocalPosTable,
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PHB_SYMB pSymbols,
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ULONG ulLen )
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{
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HB_CODEBLOCK_PTR pCBlock;
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PHB_ITEM pLocals, pBase;
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BYTE * pCode;
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HB_TRACE(HB_TR_DEBUG, ("hb_codeblockNew(%p, %hu, %p, %p, %lu)", pBuffer, uiLocals, pLocalPosTable, pSymbols, ulLen));
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/*
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* allocate memory for code block body and detach items hb_gcAlloc()
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* to be safe for automatic GC activation in hb_xgrab() without
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* calling hb_gcLock()/hb_gcUnlock(). [druzus]
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*/
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if( ulLen )
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{
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/*
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* The codeblock pcode is stored in dynamically allocated memory that
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* can be deallocated after creation of a codeblock. We have to duplicate
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* the passed buffer
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*/
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pCode = ( BYTE * ) hb_xgrab( ulLen );
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memcpy( pCode, pBuffer, ulLen );
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}
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else
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{
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/*
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* The codeblock pcode is stored in static segment.
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* The only allowed operation on a codeblock is evaluating it then
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* there is no need to duplicate its pcode - just store the pointer to it
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*/
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pCode = ( BYTE * ) pBuffer;
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}
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if( uiLocals )
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{
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/* NOTE: if a codeblock will be created by macro compiler then
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* uiLocal have to be ZERO
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* uiLocal will be also ZERO if it is a nested codeblock
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*/
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USHORT ui = 1;
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PHB_ITEM pLocal;
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/* Create a table that will store the values of local variables
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* accessed in a codeblock
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* The element 0 is unused
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* NOTE: This table can be shared by codeblocks created during
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* evaluation of this codeblock
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*/
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pLocals = ( PHB_ITEM ) hb_xgrab( ( uiLocals + 1 ) * sizeof( HB_ITEM ) );
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pLocals[ 0 ].type = HB_IT_NIL;
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do
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{
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/* Swap the current value of local variable with the reference to this
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* value.
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* TODO: If Harbour will support threads in the future then we need
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* to implement some kind of semaphores here.
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*/
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int iLocal = HB_PCODE_MKUSHORT( pLocalPosTable );
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pLocal = hb_stackLocalVariable( &iLocal );
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pLocalPosTable += 2;
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pLocal = hb_memvarDetachLocal( pLocal );
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hb_itemRawCpy( pLocals + ui, pLocal );
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/* Increment the reference counter so this value will not be
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* released if other codeblock will be deleted
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*/
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hb_memvarValueIncRef( pLocal->item.asMemvar.value );
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}
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while( ++ui <= uiLocals );
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}
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else
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{
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/* Check if this codeblock is created during evaluation of another
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* codeblock - all inner codeblocks use the local variables table
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* created during creation of the outermost codeblock
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*/
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PHB_ITEM pLocal;
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pLocal = hb_stackSelfItem();
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if( HB_IS_BLOCK( pLocal ) )
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{
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HB_CODEBLOCK_PTR pOwner = pLocal->item.asBlock.value;
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uiLocals = pOwner->uiLocals;
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pLocals = pOwner->pLocals;
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if( pLocals )
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hb_xRefInc( pLocals );
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}
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else
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pLocals = NULL;
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}
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pBase = hb_stackBaseItem();
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pCBlock = ( HB_CODEBLOCK_PTR ) hb_gcAlloc( sizeof( HB_CODEBLOCK ), hb_codeblockDeleteGarbage );
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pCBlock->pCode = pCode;
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pCBlock->dynBuffer = ulLen != 0;
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pCBlock->pDefSymb = pBase->item.asSymbol.stackstate->uiClass ?
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hb_clsMethodSym( pBase ) : pBase->item.asSymbol.value;
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pCBlock->pSymbols = pSymbols;
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pCBlock->lStatics = hb_stackGetStaticsBase();
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pCBlock->uiLocals = uiLocals;
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pCBlock->pLocals = pLocals;
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HB_TRACE(HB_TR_INFO, ("codeblock created %p", pCBlock));
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return pCBlock;
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}
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HB_CODEBLOCK_PTR hb_codeblockMacroNew( const BYTE * pBuffer, ULONG ulLen )
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{
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HB_CODEBLOCK_PTR pCBlock;
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PHB_ITEM pBase;
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BYTE * pCode;
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HB_TRACE(HB_TR_DEBUG, ("hb_codeblockMacroNew(%p, %lu)", pBuffer, ulLen));
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/*
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* The codeblock pcode is stored in dynamically allocated memory that
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* can be deallocated after creation of a codeblock. We have to duplicate
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* the passed buffer
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*/
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/*
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* allocate memory for code block body and detach items hb_gcAlloc()
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* to be safe for automatic GC activation in hb_xgrab() without
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* calling hb_gcLock()/hb_gcUnlock(). [druzus]
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*/
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pCode = ( BYTE * ) hb_xgrab( ulLen );
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memcpy( pCode, pBuffer, ulLen );
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pCBlock = ( HB_CODEBLOCK_PTR ) hb_gcAlloc( sizeof( HB_CODEBLOCK ), hb_codeblockDeleteGarbage );
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pBase = hb_stackBaseItem();
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/* Store the number of referenced local variables */
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pCBlock->pCode = pCode;
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pCBlock->dynBuffer = TRUE;
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pCBlock->pDefSymb = pBase->item.asSymbol.stackstate->uiClass ?
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hb_clsMethodSym( pBase ) : pBase->item.asSymbol.value;
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pCBlock->pSymbols = NULL; /* macro-compiled codeblock cannot acces a local symbol table */
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pCBlock->lStatics = hb_stackGetStaticsBase();
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pCBlock->uiLocals = 0;
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pCBlock->pLocals = NULL;
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HB_TRACE(HB_TR_INFO, ("codeblock created %p", pCBlock));
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return pCBlock;
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}
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/* Evaluate passed codeblock
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* Before evaluation we have to switch to a static variable base that
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* was defined when the codeblock was created.
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* (The codeblock can only see the static variables defined in a module
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* where the codeblock was created)
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*/
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void hb_codeblockEvaluate( HB_ITEM_PTR pItem )
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{
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HB_TRACE(HB_TR_DEBUG, ("hb_codeblockEvaluate(%p)", pItem));
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hb_stackSetStaticsBase( pItem->item.asBlock.value->lStatics );
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hb_vmExecute( pItem->item.asBlock.value->pCode, pItem->item.asBlock.value->pSymbols );
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}
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/* Get local variable referenced in a codeblock
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*/
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PHB_ITEM hb_codeblockGetVar( PHB_ITEM pItem, LONG iItemPos )
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{
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HB_CODEBLOCK_PTR pCBlock = pItem->item.asBlock.value;
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HB_TRACE(HB_TR_DEBUG, ("hb_codeblockGetVar(%p, %ld)", pItem, iItemPos));
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/* local variables accessed in a codeblock are always stored as reference */
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return hb_itemUnRef( pCBlock->pLocals - iItemPos );
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}
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/* Get local variable passed by reference
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*/
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PHB_ITEM hb_codeblockGetRef( HB_CODEBLOCK_PTR pCBlock, LONG iItemPos )
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{
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HB_TRACE(HB_TR_DEBUG, ("hb_codeblockGetRef(%p, %ld)", pCBlock, iItemPos));
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return pCBlock->pLocals - iItemPos;
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}
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/* retrieves the codeblock unique ID
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*/
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void * hb_codeblockId( PHB_ITEM pItem )
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{
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if( HB_IS_BLOCK( pItem ) )
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return ( void * ) pItem->item.asBlock.value;
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else
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return NULL;
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}
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