1 /*
   2  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.nashorn.internal.codegen;
  27 
  28 import static jdk.internal.org.objectweb.asm.Opcodes.IFEQ;
  29 import static jdk.internal.org.objectweb.asm.Opcodes.IFGE;
  30 import static jdk.internal.org.objectweb.asm.Opcodes.IFGT;
  31 import static jdk.internal.org.objectweb.asm.Opcodes.IFLE;
  32 import static jdk.internal.org.objectweb.asm.Opcodes.IFLT;
  33 import static jdk.internal.org.objectweb.asm.Opcodes.IFNE;
  34 import static jdk.internal.org.objectweb.asm.Opcodes.IF_ACMPEQ;
  35 import static jdk.internal.org.objectweb.asm.Opcodes.IF_ACMPNE;
  36 import static jdk.internal.org.objectweb.asm.Opcodes.IF_ICMPEQ;
  37 import static jdk.internal.org.objectweb.asm.Opcodes.IF_ICMPGE;
  38 import static jdk.internal.org.objectweb.asm.Opcodes.IF_ICMPGT;
  39 import static jdk.internal.org.objectweb.asm.Opcodes.IF_ICMPLE;
  40 import static jdk.internal.org.objectweb.asm.Opcodes.IF_ICMPLT;
  41 import static jdk.internal.org.objectweb.asm.Opcodes.IF_ICMPNE;
  42 
  43 /**
  44  * Condition enum used for all kinds of jumps, regardless of type
  45  */
  46 enum Condition {
  47     EQ,
  48     NE,
  49     LE,
  50     LT,
  51     GE,
  52     GT;
  53 
  54     static int toUnary(final Condition c) {
  55         switch (c) {
  56         case EQ:
  57             return IFEQ;
  58         case NE:
  59             return IFNE;
  60         case LE:
  61             return IFLE;
  62         case LT:
  63             return IFLT;
  64         case GE:
  65             return IFGE;
  66         case GT:
  67             return IFGT;
  68         default:
  69             throw new UnsupportedOperationException("toUnary:" + c.toString());
  70         }
  71     }
  72 
  73     static int toBinary(final Condition c, final boolean isObject) {
  74         switch (c) {
  75         case EQ:
  76             return isObject ? IF_ACMPEQ : IF_ICMPEQ;
  77         case NE:
  78             return isObject ? IF_ACMPNE : IF_ICMPNE;
  79         case LE:
  80             return IF_ICMPLE;
  81         case LT:
  82             return IF_ICMPLT;
  83         case GE:
  84             return IF_ICMPGE;
  85         case GT:
  86             return IF_ICMPGT;
  87         default:
  88             throw new UnsupportedOperationException("toBinary:" + c.toString());
  89         }
  90     }
  91 }