526 lines
18 KiB
C
526 lines
18 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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* Compiler Expression Optimizer - utilities
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*
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* Copyright 1999 Ryszard Glab
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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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/* TOFIX: Split the code, since MSC8 can't compile it, even in Huge model. */
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/* TODO:
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* - Correct post- and pre- operations to correctly handle the following code
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* a[ i++ ]++
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* Notice: in current implementation (an in Clipper too) 'i++' is evaluated
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* two times! This causes that the new value (after incrementation) is
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* stored in next element of the array.
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*/
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#include <math.h>
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#include "hbcomp.h"
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#include "hbmsetup.h"
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/* ************************************************************************* */
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#if defined( HB_MACRO_SUPPORT )
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void hb_compExprDelOperator( HB_EXPR_PTR pExpr, HB_MACRO_DECL )
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#else
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void hb_compExprDelOperator( HB_EXPR_PTR pExpr )
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#endif
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{
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if( pExpr->value.asOperator.pLeft )
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HB_EXPR_PCODE1( hb_compExprDelete, pExpr->value.asOperator.pLeft );
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if( pExpr->value.asOperator.pRight )
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HB_EXPR_PCODE1( hb_compExprDelete, pExpr->value.asOperator.pRight );
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}
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/* Generates pcodes for compound operators += -= *= /= %= ^=
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*
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* pExpr is an expression created by hb_compExprNew<operator>Eq functions
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*/
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#if defined( HB_MACRO_SUPPORT )
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void hb_compExprPushOperEq( HB_EXPR_PTR pSelf, BYTE bOpEq, HB_MACRO_DECL )
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#else
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void hb_compExprPushOperEq( HB_EXPR_PTR pSelf, BYTE bOpEq )
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#endif
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{
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/* NOTE: an object instance variable needs special handling
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*/
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if( pSelf->value.asOperator.pLeft->ExprType == HB_ET_SEND )
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{
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HB_EXPR_PTR pObj = pSelf->value.asOperator.pLeft;
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/* Push object */
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HB_EXPR_USE( pObj->value.asMessage.pObject, HB_EA_PUSH_PCODE );
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/* Push _message for later use */
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HB_EXPR_PCODE1( hb_compGenMessageData, pObj->value.asMessage.szMessage );
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/* Now push current value of variable */
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#ifdef HB_C52_STRICT
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/* push object */
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HB_EXPR_USE( pObj->value.asMessage.pObject, HB_EA_PUSH_PCODE );
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#else
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/* NOTE: this duplicate optimization requires that HB_P_MESSAGE
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* reverts items on the stack !
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* duplicate object on the stack
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*/
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_P_DUPLICATE );
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#endif
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/* now send the message */
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HB_EXPR_PCODE1( hb_compGenMessage, pObj->value.asMessage.szMessage );
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HB_EXPR_GENPCODE2( hb_compGenPCode2, HB_P_SENDSHORT, 0, ( BOOL ) 1 );
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/* NOTE: COMPATIBILITY ISSUE:
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* The above HB_C52_STRICT setting determines
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* the way the chained send messages are handled.
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* For example, the following code:
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*
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* a:b( COUNT() ):c += 1
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*
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* will be handled as:
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*
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* a:b( COUNT() ):c := a:b( COUNT() ):c + 1
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*
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* in strict Clipper compatibility mode and
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*
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* temp := a:b( COUNT() ), temp:c += 1
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*
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* in non-strict mode.
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* In practice in Clipper it will call COUNT() function two times: the
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* first time before addition and the second one after addition - in Harbour,
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* COUNT() function will be called only once, before addition.
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* The Harbour (non-strict) method is:
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* 1) faster
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* 2) it guarantees that the same instance variable of the same object will
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* be changed
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*/
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/* push increment value */
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HB_EXPR_USE( pSelf->value.asOperator.pRight, HB_EA_PUSH_PCODE );
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/* increase operation */
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HB_EXPR_GENPCODE1( hb_compGenPCode1, bOpEq );
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/* call pop message with one argument */
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HB_EXPR_GENPCODE2( hb_compGenPCode2, HB_P_SENDSHORT, 1, ( BOOL ) 1 );
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}
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/* TODO: add a special code for arrays to correctly handle a[ i++ ]++
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*/
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else
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{
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/* push old value */
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HB_EXPR_USE( pSelf->value.asOperator.pLeft, HB_EA_PUSH_PCODE );
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/* push increment value */
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HB_EXPR_USE( pSelf->value.asOperator.pRight, HB_EA_PUSH_PCODE );
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/* perform operation and duplicate the new value */
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HB_EXPR_GENPCODE1( hb_compGenPCode1, bOpEq );
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_P_DUPLICATE );
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/* pop the new value into variable and leave the copy on the stack */
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HB_EXPR_USE( pSelf->value.asOperator.pLeft, HB_EA_POP_PCODE );
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}
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}
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/* Generates pcodes for <operator>= syntax
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* used standalone as a statement (it cannot leave the value on the stack)
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*/
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#if defined( HB_MACRO_SUPPORT )
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void hb_compExprUseOperEq( HB_EXPR_PTR pSelf, BYTE bOpEq, HB_MACRO_DECL )
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#else
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void hb_compExprUseOperEq( HB_EXPR_PTR pSelf, BYTE bOpEq )
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#endif
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{
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/* NOTE: an object instance variable needs special handling
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*/
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if( pSelf->value.asOperator.pLeft->ExprType == HB_ET_SEND )
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{
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HB_EXPR_PTR pObj = pSelf->value.asOperator.pLeft;
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/* Push object */
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HB_EXPR_USE( pObj->value.asMessage.pObject, HB_EA_PUSH_PCODE );
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/* Push _message for later use */
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HB_EXPR_PCODE1( hb_compGenMessageData, pObj->value.asMessage.szMessage );
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/* Now push current value of variable */
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#ifdef HB_C52_STRICT
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/* push object */
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HB_EXPR_USE( pObj->value.asMessage.pObject, HB_EA_PUSH_PCODE );
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#else
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/* duplicate object on the stack */
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_P_DUPLICATE );
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#endif
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/* now send the message */
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HB_EXPR_PCODE1( hb_compGenMessage, pObj->value.asMessage.szMessage );
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HB_EXPR_GENPCODE2( hb_compGenPCode2, HB_P_SENDSHORT, 0, ( BOOL ) 1 );
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/* push increment value */
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HB_EXPR_USE( pSelf->value.asOperator.pRight, HB_EA_PUSH_PCODE );
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/* increase operation */
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HB_EXPR_GENPCODE1( hb_compGenPCode1, bOpEq );
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/* call pop message with one argument */
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HB_EXPR_GENPCODE2( hb_compGenPCode2, HB_P_SENDSHORT, 1, ( BOOL ) 1 );
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/* pop the value from the stack */
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_P_POP );
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}
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else
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{
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/* push old value */
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HB_EXPR_USE( pSelf->value.asOperator.pLeft, HB_EA_PUSH_PCODE );
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/* push increment value */
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HB_EXPR_USE( pSelf->value.asOperator.pRight, HB_EA_PUSH_PCODE );
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/* add */
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HB_EXPR_GENPCODE1( hb_compGenPCode1, bOpEq );
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/* pop the new value into variable and remove it from the stack */
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HB_EXPR_USE( pSelf->value.asOperator.pLeft, HB_EA_POP_PCODE );
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}
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}
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/* Generates the pcodes for pre- increment/decrement expressions
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*/
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#if defined( HB_MACRO_SUPPORT )
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void hb_compExprPushPreOp( HB_EXPR_PTR pSelf, BYTE bOper, HB_MACRO_DECL )
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#else
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void hb_compExprPushPreOp( HB_EXPR_PTR pSelf, BYTE bOper )
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#endif
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{
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/* NOTE: an object instance variable needs special handling
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*/
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if( pSelf->value.asOperator.pLeft->ExprType == HB_ET_SEND )
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{
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HB_EXPR_PTR pObj = pSelf->value.asOperator.pLeft;
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/* Push object */
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HB_EXPR_USE( pObj->value.asMessage.pObject, HB_EA_PUSH_PCODE );
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/* Push _message for later use */
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HB_EXPR_PCODE1( hb_compGenMessageData, pObj->value.asMessage.szMessage );
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/* Now push current value of variable */
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#ifdef HB_C52_STRICT
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/* push object */
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HB_EXPR_USE( pObj->value.asMessage.pObject, HB_EA_PUSH_PCODE );
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#else
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/* duplicate object on the stack */
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_P_DUPLICATE );
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#endif
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/* now send the message */
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HB_EXPR_PCODE1( hb_compGenMessage, pObj->value.asMessage.szMessage );
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HB_EXPR_GENPCODE2( hb_compGenPCode2, HB_P_SENDSHORT, 0, ( BOOL ) 1 );
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/* increase/decrease operation */
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HB_EXPR_GENPCODE1( hb_compGenPCode1, bOper );
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/* call pop message with one argument - it leaves the value on the stack */
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HB_EXPR_GENPCODE2( hb_compGenPCode2, HB_P_SENDSHORT, 1, ( BOOL ) 1 );
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}
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else
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{
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/* Push current value */
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HB_EXPR_USE( pSelf->value.asOperator.pLeft, HB_EA_PUSH_PCODE );
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/* Increment */
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HB_EXPR_GENPCODE1( hb_compGenPCode1, bOper );
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/* duplicate a value */
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_P_DUPLICATE );
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/* pop new value and leave the duplicated copy of it on the stack */
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HB_EXPR_USE( pSelf->value.asOperator.pLeft, HB_EA_POP_PCODE );
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}
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}
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/* Generates the pcodes for post- increment/decrement expressions
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*/
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#if defined( HB_MACRO_SUPPORT )
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void hb_compExprPushPostOp( HB_EXPR_PTR pSelf, BYTE bOper, HB_MACRO_DECL )
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#else
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void hb_compExprPushPostOp( HB_EXPR_PTR pSelf, BYTE bOper )
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#endif
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{
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/* NOTE: an object instance variable needs special handling
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*/
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if( pSelf->value.asOperator.pLeft->ExprType == HB_ET_SEND )
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{
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/* push current value - it will be a result of whole expression */
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HB_EXPR_USE( pSelf->value.asOperator.pLeft, HB_EA_PUSH_PCODE );
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/* now increment the value */
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HB_EXPR_PCODE2( hb_compExprPushPreOp, pSelf, bOper );
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/* pop the value from the stack */
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_P_POP );
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}
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else
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{
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/* Push current value */
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HB_EXPR_USE( pSelf->value.asOperator.pLeft, HB_EA_PUSH_PCODE );
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/* Duplicate value */
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_P_DUPLICATE );
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/* Increment */
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HB_EXPR_GENPCODE1( hb_compGenPCode1, bOper );
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/* pop new value from the stack */
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HB_EXPR_USE( pSelf->value.asOperator.pLeft, HB_EA_POP_PCODE );
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}
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}
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/* Generates the pcodes for increment/decrement operations
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* used standalone as a statement
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*/
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#if defined( HB_MACRO_SUPPORT )
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void hb_compExprUsePreOp( HB_EXPR_PTR pSelf, BYTE bOper, HB_MACRO_DECL )
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#else
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void hb_compExprUsePreOp( HB_EXPR_PTR pSelf, BYTE bOper )
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#endif
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{
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/* NOTE: an object instance variable needs special handling
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*/
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if( pSelf->value.asOperator.pLeft->ExprType == HB_ET_SEND )
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{
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HB_EXPR_PCODE2( hb_compExprPushPreOp, pSelf, bOper );
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/* pop the value from the stack */
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_P_POP );
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}
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else
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{
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/* Push current value */
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HB_EXPR_USE( pSelf->value.asOperator.pLeft, HB_EA_PUSH_PCODE );
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/* Increment */
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HB_EXPR_GENPCODE1( hb_compGenPCode1, bOper );
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/* pop new value from the stack */
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HB_EXPR_USE( pSelf->value.asOperator.pLeft, HB_EA_POP_PCODE );
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}
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}
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/* Generate pcode for aliased expression which contains macro operator on
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* the left or right side of the alias operator
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* expression->¯o or ¯o->expression or ¯o->¯o
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*/
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#if defined( HB_MACRO_SUPPORT )
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void hb_compExprUseAliasMacro( HB_EXPR_PTR pAliasedVar, BYTE bAction, HB_MACRO_DECL )
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#else
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void hb_compExprUseAliasMacro( HB_EXPR_PTR pAliasedVar, BYTE bAction )
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#endif
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{
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HB_EXPR_PTR pAlias, pVar;
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/* Alias->Var
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*/
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pAlias = pAliasedVar->value.asAlias.pAlias;
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pVar = pAliasedVar->value.asAlias.pVar;
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if( pAlias->ExprType == HB_ET_ALIAS )
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{
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/* database alias */
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/* Push alias identifier as string so it can be joined with
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* variable at runtime
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* NOTE:
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* ALIAS->&var is the same as &( "ALIAS->" + var )
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*
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*/
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HB_EXPR_PCODE2( hb_compGenPushString, pAlias->value.asSymbol, strlen(pAlias->value.asSymbol) );
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HB_EXPR_USE( pVar, HB_EA_PUSH_PCODE );
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if( bAction == HB_EA_PUSH_PCODE )
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_P_MACROPUSHALIASED );
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else
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_P_MACROPOPALIASED );
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}
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else if( pVar->ExprType == HB_ET_VARIABLE )
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{
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/* NOTE:
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* ¯o->var is the same as: &( macro + "->var" )
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*/
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HB_EXPR_USE( pAlias, HB_EA_PUSH_PCODE );
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HB_EXPR_PCODE2( hb_compGenPushString, pVar->value.asSymbol, strlen(pVar->value.asSymbol) );
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if( bAction == HB_EA_PUSH_PCODE )
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_P_MACROPUSHALIASED );
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else
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_P_MACROPOPALIASED );
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}
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else
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{
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HB_EXPR_USE( pAlias, HB_EA_PUSH_PCODE );
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HB_EXPR_USE( pVar, HB_EA_PUSH_PCODE );
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if( bAction == HB_EA_PUSH_PCODE )
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_P_MACROPUSHALIASED );
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else
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_P_MACROPOPALIASED );
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}
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/* Always add add byte to pcode indicating requested macro compiler flag. */
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#if defined( HB_MACRO_SUPPORT )
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HB_EXPR_GENPCODE1( hb_compGenPCode1, HB_COMPFLAG_RT_MACRO );
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#else
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HB_EXPR_GENPCODE1( hb_compGenPData1,
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(
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( hb_comp_Supported & HB_COMPFLAG_HARBOUR ? HB_SM_HARBOUR : 0 ) |
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( hb_comp_Supported & HB_COMPFLAG_XBASE ? HB_SM_XBASE : 0 ) |
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( hb_comp_bShortCuts ? HB_SM_SHORTCUTS : 0 ) |
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( hb_comp_Supported & HB_COMPFLAG_RT_MACRO ? HB_SM_RT_MACRO : 0 )
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)
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);
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#endif
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}
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/* Reduces the list of expressions
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*
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* pExpr is the first expression on the list
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*/
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#if defined( HB_MACRO_SUPPORT )
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ULONG hb_compExprReduceList( HB_EXPR_PTR pExpr, HB_MACRO_DECL )
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#else
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ULONG hb_compExprReduceList( HB_EXPR_PTR pExpr )
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#endif
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{
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HB_EXPR_PTR pNext;
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HB_EXPR_PTR * pPrev;
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ULONG ulCnt = 0;
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/* NOTE: During optimalization an expression on the list can be
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* replaced by the new one
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*/
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pPrev = &pExpr->value.asList.pExprList;
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pExpr = pExpr->value.asList.pExprList;
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while( pExpr )
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{
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pNext = pExpr->pNext; /* store next expression in case the current will be reduced */
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pExpr = HB_EXPR_USE( pExpr, HB_EA_REDUCE );
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*pPrev = pExpr; /* store a new expression into the previous one */
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pExpr->pNext = pNext; /* restore the link to next expression */
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pPrev = &pExpr->pNext;
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pExpr = pNext;
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++ulCnt;
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}
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return ulCnt;
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}
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BOOL hb_compExprCheckMacroVar( char * szText )
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{
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char * pTmp = szText;
|
|
BOOL bTextSubst;
|
|
BOOL bMacroText = FALSE;
|
|
|
|
while( ( pTmp = strchr( pTmp, '&' ) ) != NULL )
|
|
{
|
|
/* Check if macro operator is used inside a string
|
|
* Macro operator is ignored if it is the last char or
|
|
* next char is '(' e.g. "this is &(ignored)"
|
|
*
|
|
* NOTE: This uses _a-zA-Z pattern to check for
|
|
* variable name beginning
|
|
*/
|
|
|
|
++pTmp;
|
|
bTextSubst = ( *pTmp == '_' || (*pTmp >= 'A' && *pTmp <= 'Z') || (*pTmp >= 'a' && *pTmp <= 'z') );
|
|
/* NOTE: All variables are assumed memvars in macro compiler -
|
|
* there is no need to check for a valid name
|
|
*/
|
|
if( bTextSubst )
|
|
{
|
|
#if defined( HB_MACRO_SUPPORT )
|
|
HB_SYMBOL_UNUSED( bMacroText );
|
|
return TRUE; /*there is no need to check all '&' occurences */
|
|
#else
|
|
/* There is a valid character after '&' that can be used in
|
|
* variable name - check if the whole variable name is valid
|
|
* (local, static and field variable names are invalid because
|
|
* they are not visible at runtime)
|
|
*/
|
|
char * pStart = pTmp;
|
|
char cSave;
|
|
|
|
/* NOTE: This uses _a-zA-Z0-9 pattern to check for
|
|
* variable name
|
|
*/
|
|
while( *pTmp && (*pTmp == '_' || (*pTmp >= 'A' && *pTmp <= 'Z') || (*pTmp >= 'a' && *pTmp <= 'z') || (*pTmp >= '0' && *pTmp <= '9')) )
|
|
++pTmp;
|
|
|
|
cSave = *pTmp;
|
|
*pTmp = '\0';
|
|
hb_compVariableMacroCheck( pStart );
|
|
*pTmp = cSave;
|
|
bMacroText = TRUE;
|
|
#endif
|
|
}
|
|
}
|
|
return bMacroText;
|
|
}
|
|
|
|
/* Reduces the list of expressions
|
|
*
|
|
* pExpr is the first expression on the list
|
|
*/
|
|
HB_EXPR_PTR hb_compExprReducePlusStrings( HB_EXPR_PTR pLeft, HB_EXPR_PTR pRight, HB_MACRO_DECL )
|
|
#if defined( HB_MACRO_SUPPORT )
|
|
{
|
|
pLeft->value.asString.string = (char *) hb_xrealloc( pLeft->value.asString.string, pLeft->ulLength + pRight->ulLength + 1 );
|
|
pLeft->value.asString.dealloc = TRUE;
|
|
memcpy( pLeft->value.asString.string + pLeft->ulLength,
|
|
pRight->value.asString.string, pRight->ulLength );
|
|
pLeft->ulLength += pRight->ulLength;
|
|
pLeft->value.asString.string[ pLeft->ulLength ] = '\0';
|
|
hb_compExprFree( pRight, HB_MACRO_PARAM );
|
|
|
|
return pLeft;
|
|
}
|
|
#else
|
|
{
|
|
/* NOTE: compiler uses the hash table for storing identifiers and literals
|
|
* Strings passed for reduction can be referenced by other expressions
|
|
* then we cannot resize them or deallocate
|
|
*/
|
|
char *szString;
|
|
|
|
szString = (char *) hb_xgrab( pLeft->ulLength + pRight->ulLength + 1 );
|
|
memcpy( szString, pLeft->value.asString.string, pLeft->ulLength );
|
|
memcpy( szString + pLeft->ulLength, pRight->value.asString.string, pRight->ulLength );
|
|
pLeft->ulLength += pRight->ulLength;
|
|
szString[ pLeft->ulLength ] = '\0';
|
|
pLeft->value.asString.string = szString;
|
|
pLeft->value.asString.dealloc = TRUE;
|
|
hb_compExprFree( pRight, HB_MACRO_PARAM );
|
|
|
|
HB_SYMBOL_UNUSED( HB_MACRO_PARAM ); /* to suppress BCC warning */
|
|
return pLeft;
|
|
}
|
|
#endif
|