001/**
002 *
003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
004 *
005 * This library is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU Lesser General Public
007 * License as published by the Free Software Foundation; either 
008 * version 2.1 of the License, or (at your option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013 * Lesser General Public License for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public 
016 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
017 * 
018 **/
019package lucee.transformer.bytecode.visitor;
020
021import lucee.transformer.bytecode.BytecodeContext;
022
023import org.objectweb.asm.Label;
024import org.objectweb.asm.Opcodes;
025import org.objectweb.asm.commons.GeneratorAdapter;
026
027public final class DecisionObjectVisitor {
028
029        public static final int EQ=Opcodes.IF_ACMPEQ;
030        public static final int NEQ=Opcodes.IF_ACMPNE;
031        
032        private int operation;
033        public void visitBegin() {
034
035        }
036        public void visitMiddle(int operation) {
037                this.operation=operation;
038        }
039        public void visitEQ() {
040                this.operation=EQ;
041        }
042        public void visitNEQ() {
043                this.operation=NEQ;
044        }
045        public void visitEnd(BytecodeContext bc) {
046                GeneratorAdapter adapter = bc.getAdapter();
047
048                Label l1 = new Label();
049                adapter.visitJumpInsn(operation, l1);
050                //mv.visitJumpInsn(IF_ICMPGT, l1);
051                adapter.visitInsn(Opcodes.ICONST_0);
052                Label l2 = new Label();
053                adapter.visitJumpInsn(Opcodes.GOTO, l2);
054                adapter.visitLabel(l1);
055                adapter.visitInsn(Opcodes.ICONST_1);
056                adapter.visitLabel(l2);
057
058        }
059}