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| 1 | /* | ||
| 2 | * Copyright (c) 1994, 2003, 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 sun.tools.asm; | ||
| 27 | |||
| 28 | import sun.tools.java.*; | ||
| 29 | import sun.tools.tree.StringExpression; | ||
| 30 | import java.util.Enumeration; | ||
| 31 | import java.util.Hashtable; | ||
| 32 | import java.util.Vector; | ||
| 33 | import java.io.IOException; | ||
| 34 | import java.io.DataOutputStream; | ||
| 35 | |||
| 36 | /** | ||
| 37 | * A table of constants | ||
| 38 | * | ||
| 39 | * WARNING: The contents of this source file are not part of any | ||
| 40 | * supported API. Code that depends on them does so at its own risk: | ||
| 41 | * they are subject to change or removal without notice. | ||
| 42 | */ | ||
| 43 | public final | ||
| 44 | class ConstantPool implements RuntimeConstants { | ||
| 45 | Hashtable hash = new Hashtable(101); | ||
| 46 | |||
| 47 | /** | ||
| 48 | * Find an entry, may return 0 | ||
| 49 | */ | ||
| 50 | public int index(Object obj) { | ||
| 51 | return ((ConstantPoolData)hash.get(obj)).index; | ||
| 52 | } | ||
| 53 | |||
| 54 | /** | ||
| 55 | * Add an entry | ||
| 56 | */ | ||
| 57 | public void put(Object obj) { | ||
| 58 | ConstantPoolData data = (ConstantPoolData)hash.get(obj); | ||
| 59 | if (data == null) { | ||
| 60 | if (obj instanceof String) { | ||
| 61 | data = new StringConstantData(this, (String)obj); | ||
| 62 | } else if (obj instanceof StringExpression) { | ||
| 63 | data = new StringExpressionConstantData(this, (StringExpression)obj); | ||
| 64 | } else if (obj instanceof ClassDeclaration) { | ||
| 65 | data = new ClassConstantData(this, (ClassDeclaration)obj); | ||
| 66 | } else if (obj instanceof Type) { | ||
| 67 | data = new ClassConstantData(this, (Type)obj); | ||
| 68 | } else if (obj instanceof MemberDefinition) { | ||
| 69 | data = new FieldConstantData(this, (MemberDefinition)obj); | ||
| 70 | } else if (obj instanceof NameAndTypeData) { | ||
| 71 | data = new NameAndTypeConstantData(this, (NameAndTypeData)obj); | ||
| 72 | } else if (obj instanceof Number) { | ||
| 73 | data = new NumberConstantData(this, (Number)obj); | ||
| 74 | } | ||
| 75 | hash.put(obj, data); | ||
| 76 | } | ||
| 77 | } | ||
| 78 | |||
| 79 | /** | ||
| 80 | * Write to output | ||
| 81 | */ | ||
| 82 | public void write(Environment env, DataOutputStream out) throws IOException { | ||
| 83 | ConstantPoolData list[] = new ConstantPoolData[hash.size()]; | ||
| 84 | String keys[] = new String[list.length]; | ||
| 85 | int index = 1, count = 0; | ||
| 86 | |||
| 87 | // Make a list of all the constant pool items | ||
| 88 | for (int n = 0 ; n < 5 ; n++) { | ||
| 89 | int first = count; | ||
| 90 | for (Enumeration e = hash.elements() ; e.hasMoreElements() ;) { | ||
| 91 | ConstantPoolData data = (ConstantPoolData)e.nextElement(); | ||
| 92 | if (data.order() == n) { | ||
| 93 | keys[count] = sortKey(data); | ||
| 94 | list[count++] = data; | ||
| 95 | } | ||
| 96 | } | ||
| 97 | xsort(list, keys, first, count-1); | ||
| 98 | } | ||
| 99 | |||
| 100 | // Assign an index to each constant pool item | ||
| 101 | for (int n = 0 ; n < list.length ; n++) { | ||
| 102 | ConstantPoolData data = list[n]; | ||
| 103 | data.index = index; | ||
| 104 | index += data.width(); | ||
| 105 | } | ||
| 106 | |||
| 107 | // Write length | ||
| 108 | out.writeShort(index); | ||
| 109 | |||
| 110 | // Write each constant pool item | ||
| 111 | for (int n = 0 ; n < count ; n++) { | ||
| 112 | list[n].write(env, out, this); | ||
| 113 | } | ||
| 114 | } | ||
| 115 | |||
| 116 | private | ||
| 117 | static String sortKey(ConstantPoolData f) { | ||
| 118 | if (f instanceof NumberConstantData) { | ||
| 119 | Number num = ((NumberConstantData)f).num; | ||
| 120 | String str = num.toString(); | ||
| 121 | int key = 3; | ||
| 122 | if (num instanceof Integer) key = 0; | ||
| 123 | else if (num instanceof Float) key = 1; | ||
| 124 | else if (num instanceof Long) key = 2; | ||
| 125 | return "\0" + (char)(str.length() + key<<8) + str; | ||
| 126 | } | ||
| 127 | if (f instanceof StringExpressionConstantData) | ||
| 128 | return (String)((StringExpressionConstantData)f).str.getValue(); | ||
| 129 | if (f instanceof FieldConstantData) { | ||
| 130 | MemberDefinition fd = ((FieldConstantData)f).field; | ||
| 131 | return fd.getName()+" "+fd.getType().getTypeSignature() | ||
| 132 | +" "+fd.getClassDeclaration().getName(); | ||
| 133 | } | ||
| 134 | if (f instanceof NameAndTypeConstantData) | ||
| 135 | return ((NameAndTypeConstantData)f).name+ | ||
| 136 | " "+((NameAndTypeConstantData)f).type; | ||
| 137 | if (f instanceof ClassConstantData) | ||
| 138 | return ((ClassConstantData)f).name; | ||
| 139 | return ((StringConstantData)f).str; | ||
| 140 | } | ||
| 141 | |||
| 142 | /** | ||
| 143 | * Quick sort an array of pool entries and a corresponding array of Strings | ||
| 144 | * that are the sort keys for the field. | ||
| 145 | */ | ||
| 146 | private | ||
| 147 | static void xsort(ConstantPoolData ff[], String ss[], int left, int right) { | ||
| 148 | if (left >= right) | ||
| 149 | return; | ||
| 150 | String pivot = ss[left]; | ||
| 151 | int l = left; | ||
| 152 | int r = right; | ||
| 153 | while (l < r) { | ||
| 154 | while (l <= right && ss[l].compareTo(pivot) <= 0) | ||
| 155 | l++; | ||
| 156 | while (r >= left && ss[r].compareTo(pivot) > 0) | ||
| 157 | r--; | ||
| 158 | if (l < r) { | ||
| 159 | // swap items at l and at r | ||
| 160 | ConstantPoolData def = ff[l]; | ||
| 161 | String name = ss[l]; | ||
| 162 | ff[l] = ff[r]; ff[r] = def; | ||
| 163 | ss[l] = ss[r]; ss[r] = name; | ||
| 164 | } | ||
| 165 | } | ||
| 166 | int middle = r; | ||
| 167 | // swap left and middle | ||
| 168 | ConstantPoolData def = ff[left]; | ||
| 169 | String name = ss[left]; | ||
| 170 | ff[left] = ff[middle]; ff[middle] = def; | ||
| 171 | ss[left] = ss[middle]; ss[middle] = name; | ||
| 172 | xsort(ff, ss, left, middle-1); | ||
| 173 | xsort(ff, ss, middle + 1, right); | ||
| 174 | } | ||
| 175 | |||
| 176 | } | ||