lubomir@319: /**
lubomir@319:  * Back 2 Browser Bytecode Translator
lubomir@319:  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
lubomir@319:  *
lubomir@319:  * This program is free software: you can redistribute it and/or modify
lubomir@319:  * it under the terms of the GNU General Public License as published by
lubomir@319:  * the Free Software Foundation, version 2 of the License.
lubomir@319:  *
lubomir@319:  * This program is distributed in the hope that it will be useful,
lubomir@319:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
lubomir@319:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
lubomir@319:  * GNU General Public License for more details.
lubomir@319:  *
lubomir@319:  * You should have received a copy of the GNU General Public License
lubomir@319:  * along with this program. Look for COPYING file in the top folder.
lubomir@319:  * If not, see http://opensource.org/licenses/GPL-2.0.
lubomir@319:  */
lubomir@319: package org.apidesign.vm4brwsr;
lubomir@319: 
lubomir@319: import org.apidesign.javap.RuntimeConstants;
lubomir@319: 
lubomir@319: final class VarType {
lubomir@319:     public static final int INTEGER = 0;
lubomir@319:     public static final int LONG = 1;
lubomir@319:     public static final int FLOAT = 2;
lubomir@319:     public static final int DOUBLE = 3;
lubomir@319:     public static final int REFERENCE = 4;
lubomir@319: 
lubomir@319:     public static final int LAST = REFERENCE;
lubomir@319: 
lubomir@319:     private VarType() {
lubomir@319:     }
lubomir@319: 
lubomir@319:     public static boolean isCategory2(final int varType) {
lubomir@319:         return (varType == LONG) || (varType == DOUBLE);
lubomir@319:     }
lubomir@319: 
lubomir@319:     public static int fromStackMapType(final int smType) {
lubomir@319:         switch (smType & 0xff) {
lubomir@319:             case RuntimeConstants.ITEM_Integer:
lubomir@319:                 return VarType.INTEGER;
lubomir@319:             case RuntimeConstants.ITEM_Float:
lubomir@319:                 return VarType.FLOAT;
lubomir@319:             case RuntimeConstants.ITEM_Double:
lubomir@319:                 return VarType.DOUBLE;
lubomir@319:             case RuntimeConstants.ITEM_Long:
lubomir@319:                 return VarType.LONG;
lubomir@584:             case RuntimeConstants.ITEM_Null:
lubomir@584:             case RuntimeConstants.ITEM_InitObject:
lubomir@319:             case RuntimeConstants.ITEM_Object:
lubomir@584:             case RuntimeConstants.ITEM_NewObject:
lubomir@319:                 return VarType.REFERENCE;
lubomir@319: 
lubomir@319:             case RuntimeConstants.ITEM_Bogus:
lubomir@319:                 /* unclear how to handle for now */
lubomir@319:             default:
lubomir@319:                 throw new IllegalStateException("Unhandled stack map type");
lubomir@319:         }
lubomir@319:     }
lubomir@319: 
lubomir@319:     public static int fromConstantType(final byte constantTag) {
lubomir@319:         switch (constantTag) {
lubomir@319:             case RuntimeConstants.CONSTANT_INTEGER:
lubomir@319:                 return VarType.INTEGER;
lubomir@319:             case RuntimeConstants.CONSTANT_FLOAT:
lubomir@319:                 return VarType.FLOAT;
lubomir@319:             case RuntimeConstants.CONSTANT_LONG:
lubomir@319:                 return VarType.LONG;
lubomir@319:             case RuntimeConstants.CONSTANT_DOUBLE:
lubomir@319:                 return VarType.DOUBLE;
lubomir@319: 
lubomir@319:             case RuntimeConstants.CONSTANT_CLASS:
lubomir@319:             case RuntimeConstants.CONSTANT_UTF8:
lubomir@319:             case RuntimeConstants.CONSTANT_UNICODE:
lubomir@319:             case RuntimeConstants.CONSTANT_STRING:
lubomir@319:                 return VarType.REFERENCE;
lubomir@319: 
lubomir@319:             case RuntimeConstants.CONSTANT_FIELD:
lubomir@319:             case RuntimeConstants.CONSTANT_METHOD:
lubomir@319:             case RuntimeConstants.CONSTANT_INTERFACEMETHOD:
lubomir@319:             case RuntimeConstants.CONSTANT_NAMEANDTYPE:
lubomir@319:                 /* unclear how to handle for now */
lubomir@319:             default:
lubomir@319:                 throw new IllegalStateException("Unhandled constant tag");
lubomir@319:         }
lubomir@319:     }
lubomir@319: 
lubomir@319:     public static int fromFieldType(final char fieldType) {
lubomir@319:         switch (fieldType) {
lubomir@319:             case 'B':
lubomir@319:             case 'C':
lubomir@319:             case 'S':
lubomir@319:             case 'Z':
lubomir@319:             case 'I':
lubomir@319:                 return VarType.INTEGER;
lubomir@319:             case 'J':
lubomir@319:                 return VarType.LONG;
lubomir@319:             case 'F':
lubomir@319:                 return VarType.FLOAT;
lubomir@319:             case 'D':
lubomir@319:                 return VarType.DOUBLE;
lubomir@319:             case 'L':
lubomir@319:             case '[':
lubomir@319:                 return VarType.REFERENCE;
lubomir@319: 
lubomir@319:             default:
lubomir@319:                 throw new IllegalStateException("Unhandled field type");
lubomir@319:         }
lubomir@319:     }
lubomir@319: }