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369c3f202ff7d72dbdda1ff38d8232d86ccfc5af
odfstudio/basic/source/comp/codegen.cxx
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Mike Kaganski d84deb9536 Use std::vector in SbiBuffer 
This removes memory management from the class; unifies the types
used throughout the code using it; and simplifies it all greatly.

Also this changes errors handling. Prevoiusly setting errors to
parser didn't handle case when no parser was passed to SbiBuffer
ctor, as BufferTransformer did, and could dereference nullptr.

Change-Id: I068eb1b3e9a616a5744fc8233781c4dd4403c84d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/106452
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
2020-11-24 17:11:53 +01:00

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <basic/sberrors.hxx>
#include <basic/sbx.hxx>
#include <basic/sbmeth.hxx>
#include <basic/sbmod.hxx>
#include <image.hxx>
#include <codegen.hxx>
#include <parser.hxx>
#include <sbintern.hxx>
#include <cstddef>
#include <limits>
#include <algorithm>
#include <string_view>
#include <osl/diagnose.h>
#include <rtl/ustrbuf.hxx>
#include <com/sun/star/script/ModuleType.hpp>
// nInc is the increment size of the buffers
SbiCodeGen::SbiCodeGen(SbModule& r, SbiParser* p)
: pParser(p)
, rMod(r)
, nLine(0)
, nCol(0)
, nForLevel(0)
, bStmnt(false)
{
}
sal_uInt32 SbiCodeGen::GetPC() const
{
return aCode.GetSize();
}
// memorize the statement
void SbiCodeGen::Statement()
{
if( pParser->IsCodeCompleting() )
return;
bStmnt = true;
nLine = pParser->GetLine();
nCol = pParser->GetCol1();
// #29955 Store the information of the for-loop-layer
// in the upper Byte of the column
nCol = (nCol & 0xff) + 0x100 * nForLevel;
}
// Mark the beginning of a statement
void SbiCodeGen::GenStmnt()
{
if( pParser->IsCodeCompleting() )
return;
if( bStmnt )
{
bStmnt = false;
Gen( SbiOpcode::STMNT_, nLine, nCol );
}
}
// The Gen-Routines return the offset of the 1. operand,
// so that jumps can sink their backchain there.
sal_uInt32 SbiCodeGen::Gen( SbiOpcode eOpcode )
{
if( pParser->IsCodeCompleting() )
return 0;
#ifdef DBG_UTIL
if( eOpcode < SbiOpcode::SbOP0_START || eOpcode > SbiOpcode::SbOP0_END )
pParser->Error( ERRCODE_BASIC_INTERNAL_ERROR, "OPCODE1" );
#endif
GenStmnt();
aCode += static_cast<sal_uInt8>(eOpcode);
return GetPC();
}
sal_uInt32 SbiCodeGen::Gen( SbiOpcode eOpcode, sal_uInt32 nOpnd )
{
if( pParser->IsCodeCompleting() )
return 0;
#ifdef DBG_UTIL
if( eOpcode < SbiOpcode::SbOP1_START || eOpcode > SbiOpcode::SbOP1_END )
pParser->Error( ERRCODE_BASIC_INTERNAL_ERROR, "OPCODE2" );
#endif
GenStmnt();
aCode += static_cast<sal_uInt8>(eOpcode);
sal_uInt32 n = GetPC();
aCode += nOpnd;
return n;
}
sal_uInt32 SbiCodeGen::Gen( SbiOpcode eOpcode, sal_uInt32 nOpnd1, sal_uInt32 nOpnd2 )
{
if( pParser->IsCodeCompleting() )
return 0;
#ifdef DBG_UTIL
if( eOpcode < SbiOpcode::SbOP2_START || eOpcode > SbiOpcode::SbOP2_END )
pParser->Error( ERRCODE_BASIC_INTERNAL_ERROR, "OPCODE3" );
#endif
GenStmnt();
aCode += static_cast<sal_uInt8>(eOpcode);
sal_uInt32 n = GetPC();
aCode += nOpnd1;
aCode += nOpnd2;
return n;
}
// Storing of the created image in the module
void SbiCodeGen::Save()
{
if( pParser->IsCodeCompleting() )
return;
SbiImage* p = new SbiImage;
rMod.StartDefinitions();
// OPTION BASE-Value:
p->nDimBase = pParser->nBase;
// OPTION take over the EXPLICIT-Flag
if( pParser->bExplicit )
p->SetFlag( SbiImageFlags::EXPLICIT );
int nIfaceCount = 0;
if( rMod.mnType == css::script::ModuleType::CLASS )
{
rMod.bIsProxyModule = true;
p->SetFlag( SbiImageFlags::CLASSMODULE );
GetSbData()->pClassFac->AddClassModule( &rMod );
nIfaceCount = pParser->aIfaceVector.size();
if( !rMod.pClassData )
rMod.pClassData.reset(new SbClassData);
if( nIfaceCount )
{
for( int i = 0 ; i < nIfaceCount ; i++ )
{
const OUString& rIfaceName = pParser->aIfaceVector[i];
SbxVariable* pIfaceVar = new SbxVariable( SbxVARIANT );
pIfaceVar->SetName( rIfaceName );
SbxArray* pIfaces = rMod.pClassData->mxIfaces.get();
pIfaces->Insert32( pIfaceVar, pIfaces->Count32() );
}
}
rMod.pClassData->maRequiredTypes = pParser->aRequiredTypes;
}
else
{
GetSbData()->pClassFac->RemoveClassModule( &rMod );
// Only a ClassModule can revert to Normal
if ( rMod.mnType == css::script::ModuleType::CLASS )
{
rMod.mnType = css::script::ModuleType::NORMAL;
}
rMod.bIsProxyModule = false;
}
// GlobalCode-Flag
if( pParser->HasGlobalCode() )
{
p->SetFlag( SbiImageFlags::INITCODE );
}
// The entry points:
for( SbiSymDef* pDef = pParser->aPublics.First(); pDef;
pDef = pParser->aPublics.Next() )
{
SbiProcDef* pProc = pDef->GetProcDef();
if( pProc && pProc->IsDefined() )
{
OUString aProcName = pProc->GetName();
OUStringBuffer aIfaceProcName;
OUString aIfaceName;
sal_uInt16 nPassCount = 1;
if( nIfaceCount )
{
int nPropPrefixFound = aProcName.indexOf("Property ");
OUString aPureProcName = aProcName;
OUString aPropPrefix;
if( nPropPrefixFound == 0 )
{
aPropPrefix = aProcName.copy( 0, 13 ); // 13 == Len( "Property ?et " )
aPureProcName = aProcName.copy( 13 );
}
for( int i = 0 ; i < nIfaceCount ; i++ )
{
const OUString& rIfaceName = pParser->aIfaceVector[i];
int nFound = aPureProcName.indexOf( rIfaceName );
if( nFound == 0 && aPureProcName[rIfaceName.getLength()] == '_' )
{
if( nPropPrefixFound == 0 )
{
aIfaceProcName.append(aPropPrefix);
}
aIfaceProcName.append(std::u16string_view(aPureProcName).substr(rIfaceName.getLength() + 1) );
aIfaceName = rIfaceName;
nPassCount = 2;
break;
}
}
}
SbMethod* pMeth = nullptr;
for( sal_uInt16 nPass = 0 ; nPass < nPassCount ; nPass++ )
{
if( nPass == 1 )
{
aProcName = aIfaceProcName.toString();
}
PropertyMode ePropMode = pProc->getPropertyMode();
if( ePropMode != PropertyMode::NONE )
{
SbxDataType ePropType = SbxEMPTY;
switch( ePropMode )
{
case PropertyMode::Get:
ePropType = pProc->GetType();
break;
case PropertyMode::Let:
{
// type == type of first parameter
ePropType = SbxVARIANT; // Default
SbiSymPool* pPool = &pProc->GetParams();
if( pPool->GetSize() > 1 )
{
SbiSymDef* pPar = pPool->Get( 1 );
if( pPar )
{
ePropType = pPar->GetType();
}
}
break;
}
case PropertyMode::Set:
ePropType = SbxOBJECT;
break;
default:
OSL_FAIL("Illegal PropertyMode");
break;
}
OUString aPropName = pProc->GetPropName();
if( nPass == 1 )
{
aPropName = aPropName.copy( aIfaceName.getLength() + 1 );
}
rMod.GetProcedureProperty( aPropName, ePropType );
}
if( nPass == 1 )
{
rMod.GetIfaceMapperMethod( aProcName, pMeth );
}
else
{
pMeth = rMod.GetMethod( aProcName, pProc->GetType() );
if( !pProc->IsPublic() )
{
pMeth->SetFlag( SbxFlagBits::Private );
}
// Declare? -> Hidden
if( !pProc->GetLib().isEmpty())
{
pMeth->SetFlag( SbxFlagBits::Hidden );
}
pMeth->nStart = pProc->GetAddr();
pMeth->nLine1 = pProc->GetLine1();
pMeth->nLine2 = pProc->GetLine2();
// The parameter:
SbxInfo* pInfo = pMeth->GetInfo();
OUString aHelpFile, aComment;
sal_uInt32 nHelpId = 0;
if( pInfo )
{
// Rescue the additional data
aHelpFile = pInfo->GetHelpFile();
aComment = pInfo->GetComment();
nHelpId = pInfo->GetHelpId();
}
// And reestablish the parameter list
pInfo = new SbxInfo( aHelpFile, nHelpId );
pInfo->SetComment( aComment );
SbiSymPool* pPool = &pProc->GetParams();
// The first element is always the value of the function!
for( sal_uInt16 i = 1; i < pPool->GetSize(); i++ )
{
SbiSymDef* pPar = pPool->Get( i );
SbxDataType t = pPar->GetType();
if( !pPar->IsByVal() )
{
t = static_cast<SbxDataType>( t | SbxBYREF );
}
if( pPar->GetDims() )
{
t = static_cast<SbxDataType>( t | SbxARRAY );
}
// #33677 hand-over an Optional-Info
SbxFlagBits nFlags = SbxFlagBits::Read;
if( pPar->IsOptional() )
{
nFlags |= SbxFlagBits::Optional;
}
pInfo->AddParam( pPar->GetName(), t, nFlags );
sal_uInt32 nUserData = 0;
sal_uInt16 nDefaultId = pPar->GetDefaultId();
if( nDefaultId )
{
nUserData |= nDefaultId;
}
if( pPar->IsParamArray() )
{
nUserData |= PARAM_INFO_PARAMARRAY;
}
if( pPar->IsWithBrackets() )
{
nUserData |= PARAM_INFO_WITHBRACKETS;
}
SbxParamInfo* pParam = nullptr;
if( nUserData )
{
pParam = const_cast<SbxParamInfo*>(pInfo->GetParam( i ));
}
if( pParam )
{
pParam->nUserData = nUserData;
}
}
pMeth->SetInfo( pInfo );
}
} // for( iPass...
}
}
if (aCode.GetErrCode())
{
pParser->Error(aCode.GetErrCode(), aCode.GetErrMessage());
}
// The code
p->AddCode(aCode.GetBuffer());
// The global StringPool. 0 is not occupied.
SbiStringPool* pPool = &pParser->aGblStrings;
sal_uInt16 nSize = pPool->GetSize();
p->MakeStrings( nSize );
sal_uInt32 i;
for( i = 1; i <= nSize; i++ )
{
p->AddString( pPool->Find( i ) );
}
// Insert types
sal_uInt32 nCount = pParser->rTypeArray->Count32();
for (i = 0; i < nCount; i++)
{
p->AddType(static_cast<SbxObject *>(pParser->rTypeArray->Get32(i)));
}
// Insert enum objects
nCount = pParser->rEnumArray->Count32();
for (i = 0; i < nCount; i++)
{
p->AddEnum(static_cast<SbxObject *>(pParser->rEnumArray->Get32(i)));
}
if( !p->IsError() )
{
rMod.pImage = p;
}
else
{
delete p;
}
rMod.EndDefinitions();
}
namespace {
template < class T >
class PCodeVisitor
{
public:
virtual ~PCodeVisitor();
virtual void start( const sal_uInt8* pStart ) = 0;
virtual void processOpCode0( SbiOpcode eOp ) = 0;
virtual void processOpCode1( SbiOpcode eOp, T nOp1 ) = 0;
virtual void processOpCode2( SbiOpcode eOp, T nOp1, T nOp2 ) = 0;
virtual bool processParams() = 0;
};
}
template <class T> PCodeVisitor< T >::~PCodeVisitor()
{}
namespace {
template <class T>
class PCodeBufferWalker
{
private:
T m_nBytes;
const sal_uInt8* m_pCode;
static T readParam( sal_uInt8 const *& pCode )
{
T nOp1=0;
for ( std::size_t i=0; i<sizeof( T ); ++i )
nOp1 |= *pCode++ << ( i * 8);
return nOp1;
}
public:
PCodeBufferWalker( const sal_uInt8* pCode, T nBytes ): m_nBytes( nBytes ), m_pCode( pCode )
{
}
void visitBuffer( PCodeVisitor< T >& visitor )
{
const sal_uInt8* pCode = m_pCode;
if ( !pCode )
return;
const sal_uInt8* pEnd = pCode + m_nBytes;
visitor.start( m_pCode );
T nOp1 = 0, nOp2 = 0;
for( ; pCode < pEnd; )
{
SbiOpcode eOp = static_cast<SbiOpcode>(*pCode++);
if ( eOp <= SbiOpcode::SbOP0_END )
visitor.processOpCode0( eOp );
else if( eOp >= SbiOpcode::SbOP1_START && eOp <= SbiOpcode::SbOP1_END )
{
if ( visitor.processParams() )
nOp1 = readParam( pCode );
else
pCode += sizeof( T );
visitor.processOpCode1( eOp, nOp1 );
}
else if( eOp >= SbiOpcode::SbOP2_START && eOp <= SbiOpcode::SbOP2_END )
{
if ( visitor.processParams() )
{
nOp1 = readParam( pCode );
nOp2 = readParam( pCode );
}
else
pCode += ( sizeof( T ) * 2 );
visitor.processOpCode2( eOp, nOp1, nOp2 );
}
}
}
};
template < class T, class S >
class OffSetAccumulator : public PCodeVisitor< T >
{
T m_nNumOp0;
T m_nNumSingleParams;
T m_nNumDoubleParams;
public:
OffSetAccumulator() : m_nNumOp0(0), m_nNumSingleParams(0), m_nNumDoubleParams(0){}
virtual void start( const sal_uInt8* /*pStart*/ ) override {}
virtual void processOpCode0( SbiOpcode /*eOp*/ ) override { ++m_nNumOp0; }
virtual void processOpCode1( SbiOpcode /*eOp*/, T /*nOp1*/ ) override { ++m_nNumSingleParams; }
virtual void processOpCode2( SbiOpcode /*eOp*/, T /*nOp1*/, T /*nOp2*/ ) override { ++m_nNumDoubleParams; }
S offset()
{
typedef decltype(T(1) + S(1)) larger_t; // type capable to hold both value ranges of T and S
T result = 0 ;
static const S max = std::numeric_limits< S >::max();
result = m_nNumOp0 + ( ( sizeof(S) + 1 ) * m_nNumSingleParams ) + ( (( sizeof(S) * 2 )+ 1 ) * m_nNumDoubleParams );
return std::min<larger_t>(max, result);
}
virtual bool processParams() override { return false; }
};
template < class T, class S >
class BufferTransformer : public PCodeVisitor< T >
{
const sal_uInt8* m_pStart;
SbiBuffer m_ConvertedBuf;
public:
BufferTransformer():m_pStart(nullptr) {}
virtual void start( const sal_uInt8* pStart ) override { m_pStart = pStart; }
virtual void processOpCode0( SbiOpcode eOp ) override
{
m_ConvertedBuf += static_cast<sal_uInt8>(eOp);
}
virtual void processOpCode1( SbiOpcode eOp, T nOp1 ) override
{
m_ConvertedBuf += static_cast<sal_uInt8>(eOp);
switch( eOp )
{
case SbiOpcode::JUMP_:
case SbiOpcode::JUMPT_:
case SbiOpcode::JUMPF_:
case SbiOpcode::GOSUB_:
case SbiOpcode::CASEIS_:
case SbiOpcode::RETURN_:
case SbiOpcode::ERRHDL_:
case SbiOpcode::TESTFOR_:
nOp1 = static_cast<T>( convertBufferOffSet(m_pStart, nOp1) );
break;
case SbiOpcode::RESUME_:
if ( nOp1 > 1 )
nOp1 = static_cast<T>( convertBufferOffSet(m_pStart, nOp1) );
break;
default:
break;
}
m_ConvertedBuf += static_cast<S>(nOp1);
}
virtual void processOpCode2( SbiOpcode eOp, T nOp1, T nOp2 ) override
{
m_ConvertedBuf += static_cast<sal_uInt8>(eOp);
if ( eOp == SbiOpcode::CASEIS_ && nOp1 )
nOp1 = static_cast<T>( convertBufferOffSet(m_pStart, nOp1) );
m_ConvertedBuf += static_cast<S>(nOp1);
m_ConvertedBuf += static_cast<S>(nOp2);
}
virtual bool processParams() override { return true; }
// yeuch, careful here, you can only call
// GetBuffer on the returned SbiBuffer once, also
// you (as the caller) get to own the memory
SbiBuffer& buffer()
{
return m_ConvertedBuf;
}
static S convertBufferOffSet( const sal_uInt8* pStart, T nOp1 )
{
PCodeBufferWalker< T > aBuff( pStart, nOp1);
OffSetAccumulator< T, S > aVisitor;
aBuff.visitBuffer( aVisitor );
return aVisitor.offset();
}
};
}
sal_uInt32
SbiCodeGen::calcNewOffSet( sal_uInt8 const * pCode, sal_uInt16 nOffset )
{
return BufferTransformer< sal_uInt16, sal_uInt32 >::convertBufferOffSet( pCode, nOffset );
}
sal_uInt16
SbiCodeGen::calcLegacyOffSet( sal_uInt8 const * pCode, sal_uInt32 nOffset )
{
return BufferTransformer< sal_uInt32, sal_uInt16 >::convertBufferOffSet( pCode, nOffset );
}
template <class T, class S>
void
PCodeBuffConvertor<T,S>::convert()
{
PCodeBufferWalker< T > aBuf( m_pStart, m_nSize );
BufferTransformer< T, S > aTrnsfrmer;
aBuf.visitBuffer( aTrnsfrmer );
// TODO: handle buffer errors
m_aCnvtdBuf = aTrnsfrmer.buffer().GetBuffer();
}
template class PCodeBuffConvertor< sal_uInt16, sal_uInt32 >;
template class PCodeBuffConvertor< sal_uInt32, sal_uInt16 >;
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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