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ObxEvaluator.cpp
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ObxEvaluator.cpp
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/*
* Copyright 2020-2021 Rochus Keller <mailto:[email protected]>
*
* This file is part of the OBX parser/code model library.
*
* The following is the license that applies to this copy of the
* library. For a license to use the library under conditions
* other than those described here, please email to [email protected].
*
* GNU General Public License Usage
* This file may be used under the terms of the GNU General Public
* License (GPL) versions 2.0 or 3.0 as published by the Free Software
* Foundation and appearing in the file LICENSE.GPL included in
* the packaging of this file. Please review the following information
* to ensure GNU General Public Licensing requirements will be met:
* http://www.fsf.org/licensing/licenses/info/GPLv2.html and
* http://www.gnu.org/copyleft/gpl.html.
*/
#include "ObxEvaluator.h"
#include <math.h>
using namespace Obx;
using namespace Ob;
#ifndef OBX_AST_DECLARE_SET_METATYPE_IN_HEADER
Q_DECLARE_METATYPE( Obx::Literal::SET )
#endif
struct EvalVisitor : public AstVisitor
{
Scope* mod;
Ob::Errors* errs;
bool supportVla;
Evaluator::Result val;
EvalVisitor(Scope* m, bool b, Ob::Errors* e):mod(m),errs(e),supportVla(b){}
bool error( Expression* e, const QString& msg )
{
if( errs )
errs->error( Errors::Semantics, Loc(e->d_loc,mod->getModule()->d_file), msg );
throw "";
return false;
}
void push( const QVariant& value, quint8 vtype, bool wide = false, bool minInt = false, int strlen = 0 )
{
val.d_value = value;
val.d_vtype = vtype;
val.d_wide = wide;
val.d_minInt = minInt;
val.d_strLen = strlen;
}
void NEG(const Evaluator::Result& r, Expression* e )
{
if( r.d_vtype == Literal::Real )
push( -r.d_value.toDouble(), r.d_vtype, r.d_wide );
else if( r.d_vtype == Literal::Integer )
push( -r.d_value.toLongLong(), r.d_vtype, r.d_wide, r.d_minInt );
else
error( e, Evaluator::tr("cannot invert sign of non numerical expression"));
}
void NOT(const Evaluator::Result& r, Expression* e )
{
if( r.d_vtype == Literal::Boolean )
push( !r.d_value.toBool(), r.d_vtype );
else
error( e, Evaluator::tr("cannot negate non boolean expression"));
}
static QByteArray toString(const Evaluator::Result& v )
{
if( v.d_wide )
return QString(1,QChar((ushort)v.d_value.toUInt())).toUtf8();
else
return QByteArray(1,(quint8)v.d_value.toUInt());
}
void ADD(const Evaluator::Result& lhs, const Evaluator::Result& rhs, Expression* e )
{
if( lhs.d_vtype == Literal::Integer && rhs.d_vtype == Literal::Integer )
push(lhs.d_value.toLongLong() + rhs.d_value.toLongLong(),lhs.d_vtype, lhs.d_wide || rhs.d_wide, lhs.d_minInt || rhs.d_minInt );
else if( lhs.d_vtype == Literal::Real && rhs.d_vtype == Literal::Real )
push(lhs.d_value.toDouble() + rhs.d_value.toDouble(),lhs.d_vtype, lhs.d_wide || rhs.d_wide );
else if( lhs.d_vtype == Literal::Set && rhs.d_vtype == Literal::Set )
push(QVariant::fromValue( lhs.d_value.value<Literal::SET>() | rhs.d_value.value<Literal::SET>() ),
lhs.d_vtype);
else if( lhs.d_vtype == Literal::String && rhs.d_vtype == Literal::String )
push( lhs.d_value.toByteArray() + rhs.d_value.toByteArray(), Literal::String, lhs.d_wide || rhs.d_wide,
false, lhs.d_strLen + rhs.d_strLen );
else if( lhs.d_vtype == Literal::String && rhs.d_vtype == Literal::Char )
push( lhs.d_value.toByteArray() + toString(rhs), Literal::String, lhs.d_wide || rhs.d_wide,
false, lhs.d_strLen + 1 );
else if( lhs.d_vtype == Literal::Char && rhs.d_vtype == Literal::String )
push( toString(lhs) + rhs.d_value.toByteArray(), Literal::String, lhs.d_wide || rhs.d_wide,
false, lhs.d_strLen + 1 );
else if( lhs.d_vtype == Literal::Char && rhs.d_vtype == Literal::Char )
push( toString(lhs) + toString(rhs), Literal::String, lhs.d_wide || rhs.d_wide,
false, 1 + 1 );
else
error( e,Evaluator::tr("operand types incompatible with operator") );
}
void SUB(const Evaluator::Result& lhs, const Evaluator::Result& rhs, Expression* e )
{
if( lhs.d_vtype == Literal::Integer && rhs.d_vtype == Literal::Integer )
push(lhs.d_value.toLongLong() - rhs.d_value.toLongLong(),lhs.d_vtype, lhs.d_wide || rhs.d_wide, lhs.d_minInt || rhs.d_minInt);
else if( lhs.d_vtype == Literal::Real && rhs.d_vtype == Literal::Real )
push(lhs.d_value.toDouble() - rhs.d_value.toDouble(),lhs.d_vtype, lhs.d_wide || rhs.d_wide );
else if( lhs.d_vtype == Literal::Set && rhs.d_vtype == Literal::Set )
{
const Literal::SET a = lhs.d_value.value<Literal::SET>();
const Literal::SET b = rhs.d_value.value<Literal::SET>();
Literal::SET res;
for( int j = 0; j < a.size(); j++ )
res.set( a.test(j) && !b.test(j) );
push(QVariant::fromValue( res ),lhs.d_vtype);
}else
error(e,Evaluator::tr("operand types incompatible with operator") );
}
void FDIV(const Evaluator::Result& lhs, const Evaluator::Result& rhs, Expression* e )
{
if( lhs.d_vtype == Literal::Integer && rhs.d_vtype == Literal::Integer )
push(lhs.d_value.toLongLong() / double(rhs.d_value.toLongLong()),Literal::Real, lhs.d_wide || rhs.d_wide);
else if( lhs.d_vtype == Literal::Real && rhs.d_vtype == Literal::Real )
push(lhs.d_value.toDouble() / rhs.d_value.toDouble(),lhs.d_vtype, lhs.d_wide || rhs.d_wide );
else if( lhs.d_vtype == Literal::Set && rhs.d_vtype == Literal::Set )
{
const Literal::SET a = lhs.d_value.value<Literal::SET>();
const Literal::SET b = rhs.d_value.value<Literal::SET>();
Literal::SET res;
for( int j = 0; j < a.size(); j++ )
res.set( ( a.test(j) || b.test(j) ) && !( a.test(j) && b.test(j) ) );
push(QVariant::fromValue( res ),lhs.d_vtype);
}else
error(e,Evaluator::tr("operand types incompatible with operator") );
}
void MUL(const Evaluator::Result& lhs, const Evaluator::Result& rhs, Expression* e )
{
if( lhs.d_vtype == Literal::Integer && rhs.d_vtype == Literal::Integer )
push(lhs.d_value.toLongLong() * rhs.d_value.toLongLong(),lhs.d_vtype, lhs.d_wide || rhs.d_wide, lhs.d_minInt || rhs.d_minInt);
else if( lhs.d_vtype == Literal::Real && rhs.d_vtype == Literal::Real )
push(lhs.d_value.toDouble() * rhs.d_value.toDouble(),lhs.d_vtype, lhs.d_wide || rhs.d_wide );
else if( lhs.d_vtype == Literal::Set && rhs.d_vtype == Literal::Set )
{
const Literal::SET a = lhs.d_value.value<Literal::SET>();
const Literal::SET b = rhs.d_value.value<Literal::SET>();
push(QVariant::fromValue( a & b ),lhs.d_vtype);
}else
error(e,Evaluator::tr("operand types incompatible with operator") );
}
void DIV(const Evaluator::Result& lhs, const Evaluator::Result& rhs, Expression* e )
{
if( lhs.d_vtype == Literal::Integer && rhs.d_vtype == Literal::Integer )
{
const qint64 a = lhs.d_value.toLongLong();
const qint64 b = rhs.d_value.toLongLong();
// res = ( a - ( ( a % b + b ) % b ) ) / b;
// source: http://lists.inf.ethz.ch/pipermail/oberon/2019/013353.html
if (a < 0)
push(qint64( (a - b + 1) / b ),lhs.d_vtype, lhs.d_wide || rhs.d_wide, lhs.d_minInt || rhs.d_minInt);
else
push(qint64( a / b ),lhs.d_vtype, lhs.d_wide || rhs.d_wide, lhs.d_minInt || rhs.d_minInt);
}else
error(e,Evaluator::tr("operand types incompatible with operator") );
}
void MOD(const Evaluator::Result& lhs, const Evaluator::Result& rhs, Expression* e )
{
if( lhs.d_vtype == Literal::Integer && rhs.d_vtype == Literal::Integer )
{
const qint64 a = lhs.d_value.toLongLong();
const qint64 b = rhs.d_value.toLongLong();
// res = ( a % b + b ) % b;
// source: http://lists.inf.ethz.ch/pipermail/oberon/2019/013353.html
if (a < 0)
push(qint64( (b - 1) + ((a - b + 1)) % b ),lhs.d_vtype, lhs.d_wide || rhs.d_wide, lhs.d_minInt || rhs.d_minInt);
else
push(qint64( a % b ), lhs.d_vtype, lhs.d_wide || rhs.d_wide, lhs.d_minInt || rhs.d_minInt);
}else
error(e,Evaluator::tr("operand types incompatible with operator") );
}
void AND(const Evaluator::Result& lhs, const Evaluator::Result& rhs, Expression* e )
{
if( lhs.d_vtype == Literal::Boolean && rhs.d_vtype == Literal::Boolean )
push(lhs.d_value.toBool() && rhs.d_value.toBool(), lhs.d_vtype);
else
error(e,Evaluator::tr("operand types incompatible with operator") );
}
void OR(const Evaluator::Result& lhs, const Evaluator::Result& rhs, Expression* e )
{
if( lhs.d_vtype == Literal::Boolean && rhs.d_vtype == Literal::Boolean )
push(lhs.d_value.toBool() || rhs.d_value.toBool(), lhs.d_vtype);
else
error(e,Evaluator::tr("operand types incompatible with operator") );
}
void EQ(const Evaluator::Result& lhs, const Evaluator::Result& rhs, Expression* e )
{
if( lhs.d_vtype == Literal::Integer && rhs.d_vtype == Literal::Integer )
push(lhs.d_value.toLongLong() == rhs.d_value.toLongLong(),Literal::Boolean);
else if( lhs.d_vtype == Literal::Real && rhs.d_vtype == Literal::Real )
push(lhs.d_value.toDouble() == rhs.d_value.toDouble(),Literal::Boolean);
else if( lhs.d_vtype == Literal::Boolean && rhs.d_vtype == Literal::Boolean )
push(lhs.d_value.toBool() == rhs.d_value.toBool(), Literal::Boolean);
else if( lhs.d_vtype == Literal::Set && rhs.d_vtype == Literal::Set )
push(QVariant::fromValue( lhs.d_value.value<Literal::SET>() == rhs.d_value.value<Literal::SET>() ),
Literal::Boolean);
else if( lhs.d_vtype == Literal::String && rhs.d_vtype == Literal::String )
push(lhs.d_value.toByteArray() == rhs.d_value.toByteArray(), Literal::Boolean);
else
error(e,Evaluator::tr("operand types incompatible with operator") );
}
void NEQ(const Evaluator::Result& lhs, const Evaluator::Result& rhs, Expression* e )
{
if( lhs.d_vtype == Literal::Integer && rhs.d_vtype == Literal::Integer )
push(lhs.d_value.toLongLong() != rhs.d_value.toLongLong(),Literal::Boolean);
else if( lhs.d_vtype == Literal::Real && rhs.d_vtype == Literal::Real )
push(lhs.d_value.toDouble() != rhs.d_value.toDouble(),Literal::Boolean);
else if( lhs.d_vtype == Literal::Boolean && rhs.d_vtype == Literal::Boolean )
push(lhs.d_value.toBool() != rhs.d_value.toBool(), Literal::Boolean);
else if( lhs.d_vtype == Literal::Set && rhs.d_vtype == Literal::Set )
push(QVariant::fromValue( lhs.d_value.value<Literal::SET>() != rhs.d_value.value<Literal::SET>() ),
Literal::Boolean);
else if( lhs.d_vtype == Literal::String && rhs.d_vtype == Literal::String )
push(lhs.d_value.toByteArray() != rhs.d_value.toByteArray(), Literal::Boolean);
else
error(e,Evaluator::tr("operand types incompatible with operator") );
}
void LE(const Evaluator::Result& lhs, const Evaluator::Result& rhs, Expression* e )
{
if( lhs.d_vtype == Literal::Integer && rhs.d_vtype == Literal::Integer )
push(lhs.d_value.toLongLong() < rhs.d_value.toLongLong(),Literal::Boolean);
else if( lhs.d_vtype == Literal::Real && rhs.d_vtype == Literal::Real )
push(lhs.d_value.toDouble() < rhs.d_value.toDouble(),Literal::Boolean);
else if( lhs.d_vtype == Literal::String && rhs.d_vtype == Literal::String )
push(QString::fromUtf8(lhs.d_value.toByteArray()) < QString::fromUtf8(rhs.d_value.toByteArray()),
Literal::Boolean);
else
error(e,Evaluator::tr("operand types incompatible with operator") );
}
void LEQ(const Evaluator::Result& lhs, const Evaluator::Result& rhs, Expression* e )
{
if( lhs.d_vtype == Literal::Integer && rhs.d_vtype == Literal::Integer )
push(lhs.d_value.toLongLong() <= rhs.d_value.toLongLong(),Literal::Boolean);
else if( lhs.d_vtype == Literal::Real && rhs.d_vtype == Literal::Real )
push(lhs.d_value.toDouble() <= rhs.d_value.toDouble(),Literal::Boolean);
else if( lhs.d_vtype == Literal::String && rhs.d_vtype == Literal::String )
push(QString::fromUtf8(lhs.d_value.toByteArray()) <= QString::fromUtf8(rhs.d_value.toByteArray()),
Literal::Boolean);
else
error(e,Evaluator::tr("operand types incompatible with operator") );
}
void GT(const Evaluator::Result& lhs, const Evaluator::Result& rhs, Expression* e )
{
if( lhs.d_vtype == Literal::Integer && rhs.d_vtype == Literal::Integer )
push(lhs.d_value.toLongLong() > rhs.d_value.toLongLong(),Literal::Boolean);
else if( lhs.d_vtype == Literal::Real && rhs.d_vtype == Literal::Real )
push(lhs.d_value.toDouble() > rhs.d_value.toDouble(),Literal::Boolean);
else if( lhs.d_vtype == Literal::String && rhs.d_vtype == Literal::String )
push(QString::fromUtf8(lhs.d_value.toByteArray()) > QString::fromUtf8(rhs.d_value.toByteArray()),
Literal::Boolean);
else
error(e,Evaluator::tr("operand types incompatible with operator") );
}
void GEQ(const Evaluator::Result& lhs, const Evaluator::Result& rhs, Expression* e )
{
if( lhs.d_vtype == Literal::Integer && rhs.d_vtype == Literal::Integer )
push(lhs.d_value.toLongLong() >= rhs.d_value.toLongLong(),Literal::Boolean);
else if( lhs.d_vtype == Literal::Real && rhs.d_vtype == Literal::Real )
push(lhs.d_value.toDouble() >= rhs.d_value.toDouble(),Literal::Boolean);
else if( lhs.d_vtype == Literal::String && rhs.d_vtype == Literal::String )
push(QString::fromUtf8(lhs.d_value.toByteArray()) >= QString::fromUtf8(rhs.d_value.toByteArray()),
Literal::Boolean);
else
error(e,Evaluator::tr("operand types incompatible with operator") );
}
void IN(const Evaluator::Result& lhs, const Evaluator::Result& rhs, Expression* e )
{
if( lhs.d_vtype == Literal::Integer && rhs.d_vtype == Literal::Set )
{
const qint64 b = lhs.d_value.toLongLong();
if( b < 0 || b >= Literal::SET_BIT_LEN )
error(e,Evaluator::tr("lhs is out of range MIN(SET)..MAX(SET)") );
push( rhs.d_value.value<Literal::SET>().test(b), Literal::Boolean );
}else
error(e,Evaluator::tr("operand types incompatible with operator") );
}
void visit( Literal* me)
{
val.d_value = me->d_val;
val.d_vtype = (Literal::ValueType)me->d_vtype;
val.d_wide = me->d_wide;
val.d_minInt = me->d_minInt;
val.d_strLen = me->d_strLen;
}
void visit( SetExpr* me)
{
Literal::SET s;
for(int i = 0; i < me->d_parts.size(); i++ )
{
if( me->d_parts[i]->getTag() == Thing::T_BinExpr )
{
BinExpr* be = cast<BinExpr*>(me->d_parts[i].data());
if( be->d_op != BinExpr::Range )
error(me,Evaluator::tr("invalid set part") );
Evaluator::Result lhs, rhs;
if( be->d_lhs )
{
be->d_lhs->accept(this);
lhs = val;
}
if( be->d_rhs )
{
be->d_rhs->accept(this);
rhs = val;
}
if( lhs.d_vtype != Literal::Integer || rhs.d_vtype != Literal::Integer )
error(me,Evaluator::tr("operand types incompatible with range operator") );
const qint64 l = lhs.d_value.toLongLong();
const qint64 r = lhs.d_value.toLongLong();
if( l < 0 || l >= Literal::SET_BIT_LEN || r < 0 || r >= Literal::SET_BIT_LEN )
error(me,Evaluator::tr("lhs or rhs is out of range MIN(SET)..MAX(SET)") );
if( l <= r )
for( int b = l; b <= r; b++ )
s.set(b);
else
for( int b = r; b <= l; b++ )
s.set(b);
}else
{
me->d_parts[i]->accept(this);
if( val.d_vtype != Literal::Integer )
{
me->d_parts[i]->accept(this);
error(me,Evaluator::tr("operand type incompatible with set literal") );
}
const qint64 l = val.d_value.toLongLong();
if( l < 0 || l >= Literal::SET_BIT_LEN )
error(me,Evaluator::tr("value is out of range MIN(SET)..MAX(SET)") );
s.set(l);
}
}
push(QVariant::fromValue(s),Literal::Set);
}
void evalConst( Const* me)
{
val.d_vtype = (Literal::ValueType)me->d_vtype;
val.d_value = me->d_val;
}
void visit( IdentLeaf* me)
{
Named* n = me->getIdent();
if( n && n->getTag() == Thing::T_Const )
evalConst( cast<Const*>(n) );
else if( n && n->getTag() == Thing::T_Parameter && supportVla )
{
Parameter* p = cast<Parameter*>(n);
if( p->d_scope == mod )
throw 0;
else
error( me, Evaluator::tr("non-local access to parameter not supported") );
}else
error( me, Evaluator::tr("operation not supported in constant expressions") );
}
void visit( UnExpr* me)
{
if( me->d_sub )
me->d_sub->accept(this);
else
val = Evaluator::Result();
switch( me->d_op )
{
case UnExpr::NEG:
NEG(val,me);
break;
case UnExpr::NOT:
NOT(val,me);
break;
default:
error( me, Evaluator::tr("unary operator not supported in constant expressions") );
}
}
void visit( IdentSel* me)
{
Named* n = me->getIdent();
if( n && n->getTag() == Thing::T_Const )
evalConst( cast<Const*>(n) );
else
error( me, Evaluator::tr("operation not supported in constant expressions") );
}
void visit( ArgExpr* me)
{
if( me->d_op != ArgExpr::CALL )
error( me, Evaluator::tr("this operation is not supported in a const expression"));
Named* id = me->d_sub->getIdent();
if( id && id->getTag() == Thing::T_BuiltIn )
evalBuiltIn( cast<BuiltIn*>(id), me );
else
error( me, Evaluator::tr("this procedure call is not supported in a const expression"));
}
Type* derefed( Type* t ) const
{
if( t )
return t->derefed();
else
return 0;
}
bool evalBitOps( quint8 func, ArgExpr* me )
{
if( me->d_args.size() == 2 )
{
me->d_args.first()->accept(this);
if( val.d_vtype == Literal::Integer )
{
const bool lwide = val.d_wide;
const qint64 lhs = val.d_value.toLongLong();
me->d_args.last()->accept(this);
if( val.d_vtype == Literal::Integer )
{
const bool rwide = val.d_wide;
val.d_wide = lwide || rwide;
val.d_minInt = !val.d_wide;
const qint64 rhs = val.d_value.toLongLong();
switch( func )
{
case BuiltIn::BITAND:
if( val.d_wide )
val.d_value = qint64(lhs & rhs);
else
val.d_value = qint32(lhs & rhs);
break;
case BuiltIn::BITOR:
if( val.d_wide )
val.d_value = qint64(lhs | rhs);
else
val.d_value = qint32(lhs | rhs);
break;
case BuiltIn::BITXOR:
if( val.d_wide )
val.d_value = qint64(lhs ^ rhs);
else
val.d_value = qint32(lhs ^ rhs);
break;
case BuiltIn::BITSHL:
if( val.d_wide )
val.d_value = qint64(lhs << rhs);
else
val.d_value = qint32(lhs << rhs);
break;
case BuiltIn::BITSHR:
if( val.d_wide )
val.d_value = qint64(lhs >> rhs);
else
val.d_value = qint32(lhs >> rhs);
break;
case BuiltIn::BITASR:
if( val.d_wide )
val.d_value = qint64(lhs >> rhs | ~(~((quint64)0) >> rhs));
else
val.d_value = qint64(lhs >> rhs | ~(~((quint32)0) >> rhs));
break;
default:
Q_ASSERT(false);
}
}else
return error( me->d_args.last().data(), Evaluator::tr("invalid argument type") );
}else
return error( me->d_args.first().data(), Evaluator::tr("invalid argument type") );
}else
return error( me, Evaluator::tr("invalid number of arguments") );
return true;
}
void evalBuiltIn(BuiltIn* f, ArgExpr* me)
{
// NOTE: this is currently just a minimal implementation to meet BBOX Win/Mini, POS and Hennessy
switch( f->d_func )
{
case BuiltIn::LONG:
case BuiltIn::SHORT:
me->d_args.first()->accept(this);
return;
case BuiltIn::MAX:
case BuiltIn::MIN:
if( me->d_args.size() == 1 )
{
Named* n = me->d_args.first()->getIdent();
Type* t = derefed(me->d_args.first()->d_type.data());
if( n && n->getTag() == Thing::T_NamedType && t && t->getTag() == Thing::T_BaseType )
{
BaseType* bi = cast<BaseType*>(t);
if( f->d_func == BuiltIn::MAX )
val.d_value = bi->maxVal();
else
val.d_value = bi->minVal();
val.d_vtype = Literal::NoValue;
if( bi->d_baseType == BaseType::CHAR || bi->d_baseType == BaseType::WCHAR )
val.d_vtype = Literal::Char;
else if( bi->d_baseType >= BaseType::BYTE && bi->d_baseType <= BaseType::INT64 )
val.d_vtype = Literal::Integer;
else if( bi->d_baseType >= BaseType::REAL && bi->d_baseType <= BaseType::LONGREAL )
val.d_vtype = Literal::Real;
else if( bi->d_baseType == BaseType::SET )
val.d_vtype = Literal::Integer;
return;
}else
error( me, Evaluator::tr("base type argument required") );
}else
error( me, Evaluator::tr("invalid number of arguments") );
break;
case BuiltIn::LEN:
case BuiltIn::STRLEN:
if( me->d_args.size() == 1 )
{
Type* t = derefed(me->d_args.first()->d_type.data());
if( t && t->getTag() == Thing::T_Pointer )
t = derefed(cast<Pointer*>(t)->d_to.data());
const int tag = t ? t->getTag() : 0;
if( tag == Thing::T_Array )
{
Array* a = cast<Array*>(t);
if( f->d_func == BuiltIn::STRLEN )
{
t = derefed(a->d_type.data());
if( t && t->isChar() )
{
if( supportVla )
throw 0;
else
error( me, Evaluator::tr("cannot determine string length in a const expression") );
}else
error( me, Evaluator::tr("incompatible argument type") );
}// else
if( !a->d_lenExpr.isNull() )
{
val.d_value = a->d_len;
val.d_vtype = Literal::Integer;
return;
}else
error( me, Evaluator::tr("cannot determine length of an open array in a const expression") );
}else if( tag == Thing::T_BaseType )
{
BaseType* bt = cast<BaseType*>(t);
if( bt->d_baseType == BaseType::STRING || bt->d_baseType == BaseType::WSTRING )
{
me->d_args.first()->accept(this);
if( val.d_vtype == Literal::String )
{
val.d_value = QString::fromUtf8(val.d_value.toByteArray()).size() + 1; // including \0
val.d_vtype = Literal::Integer;
return;
}
}else if( bt->d_baseType == BaseType::BYTEARRAY )
{
me->d_args.first()->accept(this);
if( val.d_vtype == Literal::Bytes )
{
val.d_value = val.d_value.toByteArray().size();
val.d_vtype = Literal::Integer;
return;
}
}
error( me, Evaluator::tr("cannot determine the length of this argument in a const expression") );
}else
error( me, Evaluator::tr("invalid argument in a const expression") );
}else
error( me, Evaluator::tr("invalid number of arguments") );
break;
case BuiltIn::ASH:
if( me->d_args.size() == 2 )
{
Evaluator::Result x,n;
me->d_args.first()->accept(this);
x = val;
me->d_args.last()->accept(this);
n = val;
if( x.d_vtype == Literal::Integer && n.d_vtype == Literal::Integer )
{
if( x.d_wide )
val.d_value = x.d_value.toLongLong() * ::pow(2,n.d_value.toInt());
else
val.d_value = x.d_value.toInt() * ::pow(2,n.d_value.toInt());
return;
}else
error( me, Evaluator::tr("invalid argument types") );
}else
error( me, Evaluator::tr("invalid number of arguments") );
break;
case BuiltIn::ORD:
if( me->d_args.size() == 1 )
{
me->d_args.first()->accept(this);
if( val.d_vtype == Literal::Char || val.d_vtype == Literal::Boolean || val.d_vtype == Literal::Enum )
{
val.d_vtype = Literal::Integer;
return;
}else if( val.d_vtype == Literal::String )
{
const QString str = QString::fromUtf8(val.d_value.toByteArray());
if( str.size() == 1 )
{
val.d_value = str[0].unicode();
val.d_vtype = Literal::Integer;
return;
}else
error( me, Evaluator::tr("argument is not a character") );
}else
error( me, Evaluator::tr("invalid argument type") );
}else
error( me, Evaluator::tr("invalid number of arguments") );
break;
case BuiltIn::CHR:
if( me->d_args.size() == 1 )
{
me->d_args.first()->accept(this);
val.d_vtype = Literal::Char;
return;
}else
error( me, Evaluator::tr("invalid number of arguments") );
break;
case BuiltIn::ABS:
if( me->d_args.size() == 1 )
{
me->d_args.first()->accept(this);
if( val.d_vtype == Literal::Real )
val.d_value = qAbs(val.d_value.toDouble());
else if( val.d_vtype == Literal::Integer )
val.d_value = qAbs(val.d_value.toULongLong());
else
error( me, Evaluator::tr("invalid argument type") );
return;
}else
error( me, Evaluator::tr("invalid number of arguments") );
break;
case BuiltIn::ODD:
if( me->d_args.size() == 1 )
{
me->d_args.first()->accept(this);
if( val.d_vtype == Literal::Integer )
{
val.d_value = ( val.d_value.toULongLong() % 2 == 0 );
val.d_vtype = Literal::Boolean;
}else
error( me, Evaluator::tr("invalid argument type") );
return;
}else
error( me, Evaluator::tr("invalid number of arguments") );
break;
case BuiltIn::LSL:
if( me->d_args.size() == 2 )
{
me->d_args.first()->accept(this);
if( val.d_vtype == Literal::Integer )
{
qint64 x = val.d_value.toULongLong();
me->d_args.last()->accept(this);
if( val.d_vtype == Literal::Integer )
{
const qint32 n = val.d_value.toInt();
if( n < 0 )
x = x >> n;
else
x = x << n;
val.d_value = x;
}else
error( me, Evaluator::tr("invalid argument type") );
}else
error( me, Evaluator::tr("invalid argument type") );
return;
}else
error( me, Evaluator::tr("invalid number of arguments") );
break;
case BuiltIn::ASR:
if( me->d_args.size() == 2 )
{
me->d_args.first()->accept(this);
Evaluator::Result lhs = val;
if( lhs.d_vtype == Literal::Integer )
{
me->d_args.last()->accept(this);
const qint32 n = val.d_value.toInt();
if( val.d_vtype != Literal::Integer )
error( me, Evaluator::tr("invalid argument type") );
if( lhs.d_wide )
{
qint64 x = lhs.d_value.toLongLong();
if( x < 0 && n > 0 )
x = x >> n | ~(~((quint64)0) >> n);
else
x = x >> n;
val.d_wide = true;
val.d_minInt = false;
val.d_value = x;
}else
{
qint32 x = lhs.d_value.toInt();
if( x < 0 && n > 0 )
x = x >> n | ~(~((quint32)0) >> n);
else
x = x >> n;
val.d_minInt = true;
val.d_wide = false;
val.d_value = x;
}
}else
error( me, Evaluator::tr("invalid argument type") );
return;
}else
error( me, Evaluator::tr("invalid number of arguments") );
break;
case BuiltIn::ROR:
if( me->d_args.size() == 2 )
{
me->d_args.first()->accept(this);
if( val.d_vtype == Literal::Integer )
{
qint64 x = val.d_value.toULongLong();
me->d_args.last()->accept(this);
if( val.d_vtype == Literal::Integer )
{
x = x >> val.d_value.toULongLong();
val.d_value = x;
}else
error( me, Evaluator::tr("invalid argument type") );
}else
error( me, Evaluator::tr("invalid argument type") );
return;
}else
error( me, Evaluator::tr("invalid number of arguments") );
break;
case BuiltIn::FLOOR:
if( me->d_args.size() == 1 )
{
me->d_args.first()->accept(this);
if( val.d_vtype == Literal::Real )
{
val.d_value = floor( val.d_value.toDouble() );
val.d_vtype = Literal::Integer;
}else
error( me, Evaluator::tr("invalid argument type") );
return;
}else
error( me, Evaluator::tr("invalid number of arguments") );
break;
case BuiltIn::FLT:
if( me->d_args.size() == 1 )
{
me->d_args.first()->accept(this);
if( val.d_vtype == Literal::Integer )
val.d_vtype = Literal::Real;
else
error( me, Evaluator::tr("invalid argument type") );
return;
}else
error( me, Evaluator::tr("invalid number of arguments") );
break;
case BuiltIn::BITNOT:
if( me->d_args.size() == 1 )
{
me->d_args.first()->accept(this);
if( val.d_vtype == Literal::Integer )
{
if( val.d_wide )
val.d_value = qint64(~val.d_value.toULongLong());
else
val.d_value = qint32(~val.d_value.toUInt());
}else
error( me, Evaluator::tr("invalid argument type") );
return;
}else
error( me, Evaluator::tr("invalid number of arguments") );
break;
case BuiltIn::BITAND:
case BuiltIn::BITOR:
case BuiltIn::BITXOR:
case BuiltIn::BITSHL:
case BuiltIn::BITSHR:
case BuiltIn::BITASR:
if( evalBitOps(f->d_func,me) )
return;
break;
case BuiltIn::BYTESIZE:
if( me->d_args.size() == 1 )
{
val.d_value = 0;
val.d_vtype = Literal::Integer;
Named* n = me->d_args[0]->getIdent();
if( n && n->getTag() == Thing::T_NamedType )
{
Type* t = derefed(n->d_type.data());
if( t )
val.d_value = t->getByteSize();
}
}
break;
case BuiltIn::INC:
case BuiltIn::DEC:
case BuiltIn::INCL:
case BuiltIn::EXCL:
case BuiltIn::NEW:
case BuiltIn::ASSERT:
case BuiltIn::PACK:
case BuiltIn::UNPK:
case BuiltIn::LED:
case BuiltIn::TRAP:
case BuiltIn::TRAPIF:
case BuiltIn::SYS_ADR:
case BuiltIn::SYS_BIT:
case BuiltIn::SYS_GET:
case BuiltIn::SYS_H:
case BuiltIn::SYS_LDREG:
case BuiltIn::SYS_PUT:
case BuiltIn::SYS_REG:
case BuiltIn::SYS_PORTIN:
case BuiltIn::SYS_PORTOUT:
case BuiltIn::SYS_VAL:
case BuiltIn::SYS_COPY:
case BuiltIn::CAP:
case BuiltIn::HALT:
case BuiltIn::COPY:
case BuiltIn::ENTIER:
case BuiltIn::BITS:
case BuiltIn::SYS_MOVE:
case BuiltIn::SYS_NEW:
case BuiltIn::SYS_ROT:
case BuiltIn::SYS_LSH:
case BuiltIn::SYS_GETREG:
case BuiltIn::SYS_PUTREG:
case BuiltIn::SYS_TYP:
case BuiltIn::CAST:
case BuiltIn::WCHR:
default:
// TODO: some should be implemented!
error( me, Evaluator::tr("built-in procedure not supported in const expressions") );
break;
}
val = Evaluator::Result();
}
void visit( BinExpr* me)
{
Evaluator::Result lhs, rhs;
if( me->d_lhs )
{
me->d_lhs->accept(this);
lhs = val;
}
if( me->d_rhs )
{
me->d_rhs->accept(this);
rhs = val;
}
switch( me->d_op )
{
case BinExpr::IN:
IN(lhs,rhs,me);
break;
case BinExpr::ADD:
ADD(lhs,rhs,me);
break;
case BinExpr::SUB:
SUB(lhs,rhs,me);
break;
case BinExpr::FDIV:
FDIV(lhs,rhs,me);
break;
case BinExpr::MUL:
MUL(lhs,rhs,me);
break;
case BinExpr::DIV:
DIV(lhs,rhs,me);
break;
case BinExpr::MOD:
MOD(lhs,rhs,me);
break;
case BinExpr::AND:
AND(lhs,rhs,me);
break;
case BinExpr::OR:
OR(lhs,rhs,me);
break;
case BinExpr::EQ:
EQ(lhs,rhs,me);
break;
case BinExpr::NEQ:
NEQ(lhs,rhs,me);
break;
case BinExpr::LT:
LE(lhs,rhs,me);
break;
case BinExpr::LEQ:
LEQ(lhs,rhs,me);
break;
case BinExpr::GT:
GT(lhs,rhs,me);
break;
case BinExpr::GEQ:
GEQ(lhs,rhs,me);
break;
default:
error(me,Evaluator::tr("operator not supported for constants"));
}
}
};
Evaluator::Result Evaluator::eval(Expression* e, Scope* m, bool supportVla, Errors* err)
{
Q_ASSERT( m != 0 && e != 0 );
EvalVisitor ev(m, supportVla,err);
try
{
e->accept( &ev );
return ev.val;
}catch(int)
{
Result r;
r.d_vtype = Literal::Integer;
r.d_dyn = true;
return r;
}catch(const char*)
{
return Result();
}
}