/*
* Copyright (C) 2010-2016 JPEXS, All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3.0 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library.
*/
package com.jpexs.decompiler.flash.abc.avm2.instructions.other2;
import com.jpexs.decompiler.flash.abc.ABC;
import com.jpexs.decompiler.flash.abc.avm2.AVM2ConstantPool;
import com.jpexs.decompiler.flash.abc.avm2.LocalDataArea;
import com.jpexs.decompiler.flash.abc.avm2.instructions.AVM2Instruction;
import com.jpexs.decompiler.flash.abc.avm2.instructions.InstructionDefinition;
import com.jpexs.decompiler.flash.abc.avm2.instructions.types.CoerceOrConvertTypeIns;
import com.jpexs.decompiler.flash.ecma.Null;
import com.jpexs.decompiler.flash.ecma.Undefined;
import com.jpexs.decompiler.graph.DottedChain;
import com.jpexs.decompiler.graph.GraphTargetItem;
import com.jpexs.decompiler.graph.TypeItem;
/**
*
* @author JPEXS
*/
public class CoerceOIns extends InstructionDefinition implements CoerceOrConvertTypeIns {
public CoerceOIns() {
super(0x89, "coerce_o", new int[]{}, true); // stack: -1+1
}
@Override
public boolean execute(LocalDataArea lda, AVM2ConstantPool constants, AVM2Instruction ins) {
Object value = lda.operandStack.pop();
// The only action appears to be to convert undefined to null.
if (value == Undefined.INSTANCE) {
value = Null.INSTANCE;
}
lda.operandStack.push(value);
return true;
}
@Override
public int getStackPopCount(AVM2Instruction ins, ABC abc) {
return 1;
}
@Override
public int getStackPushCount(AVM2Instruction ins, ABC abc) {
return 1;
}
@Override
public GraphTargetItem getTargetType(AVM2ConstantPool constants, AVM2Instruction ins) {
return new TypeItem(DottedChain.OBJECT);
}
}