1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/VarType.java Tue Feb 26 16:54:16 2013 +0100
1.3 @@ -0,0 +1,110 @@
1.4 +/**
1.5 + * Back 2 Browser Bytecode Translator
1.6 + * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
1.7 + *
1.8 + * This program is free software: you can redistribute it and/or modify
1.9 + * it under the terms of the GNU General Public License as published by
1.10 + * the Free Software Foundation, version 2 of the License.
1.11 + *
1.12 + * This program is distributed in the hope that it will be useful,
1.13 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.14 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.15 + * GNU General Public License for more details.
1.16 + *
1.17 + * You should have received a copy of the GNU General Public License
1.18 + * along with this program. Look for COPYING file in the top folder.
1.19 + * If not, see http://opensource.org/licenses/GPL-2.0.
1.20 + */
1.21 +package org.apidesign.vm4brwsr;
1.22 +
1.23 +import org.apidesign.javap.RuntimeConstants;
1.24 +
1.25 +final class VarType {
1.26 + public static final int INTEGER = 0;
1.27 + public static final int LONG = 1;
1.28 + public static final int FLOAT = 2;
1.29 + public static final int DOUBLE = 3;
1.30 + public static final int REFERENCE = 4;
1.31 +
1.32 + public static final int LAST = REFERENCE;
1.33 +
1.34 + private VarType() {
1.35 + }
1.36 +
1.37 + public static boolean isCategory2(final int varType) {
1.38 + return (varType == LONG) || (varType == DOUBLE);
1.39 + }
1.40 +
1.41 + public static int fromStackMapType(final int smType) {
1.42 + switch (smType & 0xff) {
1.43 + case RuntimeConstants.ITEM_Integer:
1.44 + return VarType.INTEGER;
1.45 + case RuntimeConstants.ITEM_Float:
1.46 + return VarType.FLOAT;
1.47 + case RuntimeConstants.ITEM_Double:
1.48 + return VarType.DOUBLE;
1.49 + case RuntimeConstants.ITEM_Long:
1.50 + return VarType.LONG;
1.51 + case RuntimeConstants.ITEM_Null:
1.52 + case RuntimeConstants.ITEM_InitObject:
1.53 + case RuntimeConstants.ITEM_Object:
1.54 + case RuntimeConstants.ITEM_NewObject:
1.55 + return VarType.REFERENCE;
1.56 +
1.57 + case RuntimeConstants.ITEM_Bogus:
1.58 + /* unclear how to handle for now */
1.59 + default:
1.60 + throw new IllegalStateException("Unhandled stack map type");
1.61 + }
1.62 + }
1.63 +
1.64 + public static int fromConstantType(final byte constantTag) {
1.65 + switch (constantTag) {
1.66 + case RuntimeConstants.CONSTANT_INTEGER:
1.67 + return VarType.INTEGER;
1.68 + case RuntimeConstants.CONSTANT_FLOAT:
1.69 + return VarType.FLOAT;
1.70 + case RuntimeConstants.CONSTANT_LONG:
1.71 + return VarType.LONG;
1.72 + case RuntimeConstants.CONSTANT_DOUBLE:
1.73 + return VarType.DOUBLE;
1.74 +
1.75 + case RuntimeConstants.CONSTANT_CLASS:
1.76 + case RuntimeConstants.CONSTANT_UTF8:
1.77 + case RuntimeConstants.CONSTANT_UNICODE:
1.78 + case RuntimeConstants.CONSTANT_STRING:
1.79 + return VarType.REFERENCE;
1.80 +
1.81 + case RuntimeConstants.CONSTANT_FIELD:
1.82 + case RuntimeConstants.CONSTANT_METHOD:
1.83 + case RuntimeConstants.CONSTANT_INTERFACEMETHOD:
1.84 + case RuntimeConstants.CONSTANT_NAMEANDTYPE:
1.85 + /* unclear how to handle for now */
1.86 + default:
1.87 + throw new IllegalStateException("Unhandled constant tag");
1.88 + }
1.89 + }
1.90 +
1.91 + public static int fromFieldType(final char fieldType) {
1.92 + switch (fieldType) {
1.93 + case 'B':
1.94 + case 'C':
1.95 + case 'S':
1.96 + case 'Z':
1.97 + case 'I':
1.98 + return VarType.INTEGER;
1.99 + case 'J':
1.100 + return VarType.LONG;
1.101 + case 'F':
1.102 + return VarType.FLOAT;
1.103 + case 'D':
1.104 + return VarType.DOUBLE;
1.105 + case 'L':
1.106 + case '[':
1.107 + return VarType.REFERENCE;
1.108 +
1.109 + default:
1.110 + throw new IllegalStateException("Unhandled field type");
1.111 + }
1.112 + }
1.113 +}