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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 | +} | |