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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.tree; | |
| 27 | + | |
| 28 | +import sun.tools.java.*; | |
| 29 | +import sun.tools.tree.*; | |
| 30 | +import java.util.Vector; | |
| 31 | + | |
| 32 | +/** | |
| 33 | + * A local Field | |
| 34 | + * | |
| 35 | + * WARNING: The contents of this source file are not part of any | |
| 36 | + * supported API. Code that depends on them does so at its own risk: | |
| 37 | + * they are subject to change or removal without notice. | |
| 38 | + */ | |
| 39 | + | |
| 40 | +public | |
| 41 | +class LocalMember extends MemberDefinition { | |
| 42 | + /** | |
| 43 | + * The number of the variable | |
| 44 | + */ | |
| 45 | + int number = -1; | |
| 46 | + | |
| 47 | + /** | |
| 48 | + * Some statistics | |
| 49 | + */ | |
| 50 | + int readcount; | |
| 51 | + int writecount; | |
| 52 | + | |
| 53 | + /** | |
| 54 | + * An indication of which block the variable comes from. | |
| 55 | + * Helps identify uplevel references. | |
| 56 | + */ | |
| 57 | + int scopeNumber; | |
| 58 | + | |
| 59 | + /** | |
| 60 | + * Return current nesting level, i.e., the value of 'scopeNumber'. | |
| 61 | + * Made public for the benefit of 'ClassDefinition.resolveName'. | |
| 62 | + */ | |
| 63 | + public int getScopeNumber() { | |
| 64 | + return scopeNumber; | |
| 65 | + } | |
| 66 | + | |
| 67 | + /** | |
| 68 | + * Used by copyInline to record the original of this copy. | |
| 69 | + */ | |
| 70 | + LocalMember originalOfCopy; | |
| 71 | + | |
| 72 | + /** | |
| 73 | + * The previous local variable, this list is used to build a nested | |
| 74 | + * context of local variables. | |
| 75 | + */ | |
| 76 | + LocalMember prev; | |
| 77 | + | |
| 78 | + /** | |
| 79 | + * Constructor | |
| 80 | + */ | |
| 81 | + public LocalMember(long where, ClassDefinition clazz, int modifiers, Type type, | |
| 82 | + Identifier name) { | |
| 83 | + super(where, clazz, modifiers, type, name, null, null); | |
| 84 | + } | |
| 85 | + | |
| 86 | + /** | |
| 87 | + * Constructor for a block-inner class. | |
| 88 | + */ | |
| 89 | + public LocalMember(ClassDefinition innerClass) { | |
| 90 | + super(innerClass); | |
| 91 | + | |
| 92 | + // The class's "real" name is something like "foo$1$bar", but locally: | |
| 93 | + name = innerClass.getLocalName(); | |
| 94 | + } | |
| 95 | + | |
| 96 | + /** | |
| 97 | + * Constructor for a proxy to an instance or class variable. | |
| 98 | + */ | |
| 99 | + LocalMember(MemberDefinition field) { | |
| 100 | + this(0, null, 0, field.getType(), idClass); | |
| 101 | + // use this random slot to store the info: | |
| 102 | + accessPeer = field; | |
| 103 | + } | |
| 104 | + | |
| 105 | + /** | |
| 106 | + * Is this a proxy for the given field? | |
| 107 | + */ | |
| 108 | + final MemberDefinition getMember() { | |
| 109 | + return (name == idClass) ? accessPeer : null; | |
| 110 | + } | |
| 111 | + | |
| 112 | + /** | |
| 113 | + * Special checks | |
| 114 | + */ | |
| 115 | + public boolean isLocal() { | |
| 116 | + return true; | |
| 117 | + } | |
| 118 | + | |
| 119 | + /** | |
| 120 | + * Make a copy of this field, which is an argument to a method | |
| 121 | + * or constructor. Arrange so that when occurrences of the field | |
| 122 | + * are encountered in an immediately following copyInline() operation, | |
| 123 | + * the expression nodes will replace the original argument by the | |
| 124 | + * fresh copy. | |
| 125 | + */ | |
| 126 | + public LocalMember copyInline(Context ctx) { | |
| 127 | + LocalMember copy = new LocalMember(where, clazz, modifiers, type, name); | |
| 128 | + copy.readcount = this.readcount; | |
| 129 | + copy.writecount = this.writecount; | |
| 130 | + | |
| 131 | + copy.originalOfCopy = this; | |
| 132 | + | |
| 133 | + // Make a temporary link from the original. | |
| 134 | + // It only stays valid through the next call to copyInline(). | |
| 135 | + // (This means that recursive inlining won't work.) | |
| 136 | + // To stay honest, we mark these inline copies: | |
| 137 | + copy.addModifiers(M_LOCAL); | |
| 138 | + if (this.accessPeer != null | |
| 139 | + && (this.accessPeer.getModifiers() & M_LOCAL) == 0) { | |
| 140 | + throw new CompilerError("local copyInline"); | |
| 141 | + } | |
| 142 | + this.accessPeer = copy; | |
| 143 | + | |
| 144 | + return copy; | |
| 145 | + } | |
| 146 | + | |
| 147 | + /** | |
| 148 | + * Returns the previous result of copyInline(ctx). | |
| 149 | + * Must be called in the course of an Expression.copyInline() | |
| 150 | + * operation that immediately follows the LocalMember.copyInline(). | |
| 151 | + * Return "this" if there is no such copy. | |
| 152 | + */ | |
| 153 | + public LocalMember getCurrentInlineCopy(Context ctx) { | |
| 154 | + MemberDefinition accessPeer = this.accessPeer; | |
| 155 | + if (accessPeer != null && (accessPeer.getModifiers() & M_LOCAL) != 0) { | |
| 156 | + LocalMember copy = (LocalMember)accessPeer; | |
| 157 | + return copy; | |
| 158 | + } | |
| 159 | + return this; | |
| 160 | + } | |
| 161 | + | |
| 162 | + /** | |
| 163 | + * May inline copies of all the arguments of the given method. | |
| 164 | + */ | |
| 165 | + static public LocalMember[] copyArguments(Context ctx, MemberDefinition field) { | |
| 166 | + Vector v = field.getArguments(); | |
| 167 | + LocalMember res[] = new LocalMember[v.size()]; | |
| 168 | + v.copyInto(res); | |
| 169 | + for (int i = 0; i < res.length; i++) { | |
| 170 | + res[i] = res[i].copyInline(ctx); | |
| 171 | + } | |
| 172 | + return res; | |
| 173 | + } | |
| 174 | + | |
| 175 | + /** | |
| 176 | + * Call this when finished with the result of a copyArguments() call. | |
| 177 | + */ | |
| 178 | + static public void doneWithArguments(Context ctx, LocalMember res[]) { | |
| 179 | + for (int i = 0; i < res.length; i++) { | |
| 180 | + if (res[i].originalOfCopy.accessPeer == res[i]) { | |
| 181 | + res[i].originalOfCopy.accessPeer = null; | |
| 182 | + } | |
| 183 | + } | |
| 184 | + } | |
| 185 | + | |
| 186 | + /** | |
| 187 | + * Is this local variable's value stable and simple enough to be directly | |
| 188 | + * substituted for occurrences of the variable itself? | |
| 189 | + * (This decision is made by VarDeclarationStatement.inline().) | |
| 190 | + */ | |
| 191 | + public boolean isInlineable(Environment env, boolean fromFinal) { | |
| 192 | + return (getModifiers() & M_INLINEABLE) != 0; | |
| 193 | + } | |
| 194 | + | |
| 195 | + /** | |
| 196 | + * Check if used | |
| 197 | + */ | |
| 198 | + public boolean isUsed() { | |
| 199 | + return (readcount != 0) || (writecount != 0); | |
| 200 | + } | |
| 201 | + | |
| 202 | + // Used by class Context, only on members of MemberDefinition.available: | |
| 203 | + LocalMember getAccessVar() { | |
| 204 | + return (LocalMember)accessPeer; | |
| 205 | + } | |
| 206 | + void setAccessVar(LocalMember f) { | |
| 207 | + accessPeer = f; | |
| 208 | + } | |
| 209 | + // Used by class Context, only on "AccessVar" constructor args | |
| 210 | + MemberDefinition getAccessVarMember() { | |
| 211 | + return accessPeer; | |
| 212 | + } | |
| 213 | + void setAccessVarMember(MemberDefinition f) { | |
| 214 | + accessPeer = f; | |
| 215 | + } | |
| 216 | + | |
| 217 | + | |
| 218 | + /** | |
| 219 | + * Return value | |
| 220 | + */ | |
| 221 | + public Node getValue(Environment env) { | |
| 222 | + return (Expression)getValue(); | |
| 223 | + } | |
| 224 | + | |
| 225 | + /** | |
| 226 | + * Value number for vsets, or -1 if none. | |
| 227 | + */ | |
| 228 | + public int getNumber(Context ctx) { | |
| 229 | + return number; | |
| 230 | + } | |
| 231 | +} | |