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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 | } | ||