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 DecisionDoubleVisitor {
028        /*
029        public static final int GT=Opcodes.IF_ICMPGT;
030        public static final int GTE=Opcodes.IF_ICMPGE;
031        public static final int LT=Opcodes.IF_ICMPLT;
032        public static final int LTE=Opcodes.IF_ICMPLE;
033        public static final int EQ=Opcodes.IF_ICMPEQ;
034        public static final int NEQ=Opcodes.IF_ICMPNE;
035        */
036        public static final int GT=Opcodes.IFLE;
037        public static final int GTE=Opcodes.IFLT;
038        public static final int LT=Opcodes.IFGE;
039        public static final int LTE=Opcodes.IFGT;
040        public static final int EQ=Opcodes.IFNE;
041        public static final int NEQ=Opcodes.IFEQ;
042        
043        private int operation;
044        public void visitBegin() {
045
046        }
047        public void visitMiddle(int operation) {
048                this.operation=operation;
049        }
050        public void visitGT() {
051                this.operation=GT;
052        }
053        public void visitGTE() {
054                this.operation=GTE;
055        }
056        public void visitLT() {
057                this.operation=LT;
058        }
059        public void visitLTE() {
060                this.operation=LTE;
061        }
062        public void visitEQ() {
063                this.operation=EQ;
064        }
065        public void visitNEQ() {
066                this.operation=NEQ;
067        }
068        public void visitEnd(BytecodeContext bc) {
069                GeneratorAdapter adapter = bc.getAdapter();
070                Label l1 = new Label();
071                Label l2 = new Label();
072                adapter.visitInsn(Opcodes.DCMPL);
073                adapter.visitJumpInsn(operation, l1);
074                adapter.visitInsn(Opcodes.ICONST_1);
075                adapter.visitJumpInsn(Opcodes.GOTO, l2);
076                adapter.visitLabel(l1);
077                adapter.visitInsn(Opcodes.ICONST_0);
078                adapter.visitLabel(l2);
079        }
080}