|
Java example source code file (LocalMember.java)
The LocalMember.java Java example source code/* * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package sun.tools.tree; import sun.tools.java.*; import sun.tools.tree.*; import java.util.Vector; /** * A local Field * * WARNING: The contents of this source file are not part of any * supported API. Code that depends on them does so at its own risk: * they are subject to change or removal without notice. */ public class LocalMember extends MemberDefinition { /** * The number of the variable */ int number = -1; /** * Some statistics */ int readcount; int writecount; /** * An indication of which block the variable comes from. * Helps identify uplevel references. */ int scopeNumber; /** * Return current nesting level, i.e., the value of 'scopeNumber'. * Made public for the benefit of 'ClassDefinition.resolveName'. */ public int getScopeNumber() { return scopeNumber; } /** * Used by copyInline to record the original of this copy. */ LocalMember originalOfCopy; /** * The previous local variable, this list is used to build a nested * context of local variables. */ LocalMember prev; /** * Constructor */ public LocalMember(long where, ClassDefinition clazz, int modifiers, Type type, Identifier name) { super(where, clazz, modifiers, type, name, null, null); } /** * Constructor for a block-inner class. */ public LocalMember(ClassDefinition innerClass) { super(innerClass); // The class's "real" name is something like "foo$1$bar", but locally: name = innerClass.getLocalName(); } /** * Constructor for a proxy to an instance or class variable. */ LocalMember(MemberDefinition field) { this(0, null, 0, field.getType(), idClass); // use this random slot to store the info: accessPeer = field; } /** * Is this a proxy for the given field? */ final MemberDefinition getMember() { return (name == idClass) ? accessPeer : null; } /** * Special checks */ public boolean isLocal() { return true; } /** * Make a copy of this field, which is an argument to a method * or constructor. Arrange so that when occurrences of the field * are encountered in an immediately following copyInline() operation, * the expression nodes will replace the original argument by the * fresh copy. */ public LocalMember copyInline(Context ctx) { LocalMember copy = new LocalMember(where, clazz, modifiers, type, name); copy.readcount = this.readcount; copy.writecount = this.writecount; copy.originalOfCopy = this; // Make a temporary link from the original. // It only stays valid through the next call to copyInline(). // (This means that recursive inlining won't work.) // To stay honest, we mark these inline copies: copy.addModifiers(M_LOCAL); if (this.accessPeer != null && (this.accessPeer.getModifiers() & M_LOCAL) == 0) { throw new CompilerError("local copyInline"); } this.accessPeer = copy; return copy; } /** * Returns the previous result of copyInline(ctx). * Must be called in the course of an Expression.copyInline() * operation that immediately follows the LocalMember.copyInline(). * Return "this" if there is no such copy. */ public LocalMember getCurrentInlineCopy(Context ctx) { MemberDefinition accessPeer = this.accessPeer; if (accessPeer != null && (accessPeer.getModifiers() & M_LOCAL) != 0) { LocalMember copy = (LocalMember)accessPeer; return copy; } return this; } /** * May inline copies of all the arguments of the given method. */ static public LocalMember[] copyArguments(Context ctx, MemberDefinition field) { Vector v = field.getArguments(); LocalMember res[] = new LocalMember[v.size()]; v.copyInto(res); for (int i = 0; i < res.length; i++) { res[i] = res[i].copyInline(ctx); } return res; } /** * Call this when finished with the result of a copyArguments() call. */ static public void doneWithArguments(Context ctx, LocalMember res[]) { for (int i = 0; i < res.length; i++) { if (res[i].originalOfCopy.accessPeer == res[i]) { res[i].originalOfCopy.accessPeer = null; } } } /** * Is this local variable's value stable and simple enough to be directly * substituted for occurrences of the variable itself? * (This decision is made by VarDeclarationStatement.inline().) */ public boolean isInlineable(Environment env, boolean fromFinal) { return (getModifiers() & M_INLINEABLE) != 0; } /** * Check if used */ public boolean isUsed() { return (readcount != 0) || (writecount != 0); } // Used by class Context, only on members of MemberDefinition.available: LocalMember getAccessVar() { return (LocalMember)accessPeer; } void setAccessVar(LocalMember f) { accessPeer = f; } // Used by class Context, only on "AccessVar" constructor args MemberDefinition getAccessVarMember() { return accessPeer; } void setAccessVarMember(MemberDefinition f) { accessPeer = f; } /** * Return value */ public Node getValue(Environment env) { return (Expression)getValue(); } /** * Value number for vsets, or -1 if none. */ public int getNumber(Context ctx) { return number; } } Other Java examples (source code examples)Here is a short list of links related to this Java LocalMember.java source code file: |
... this post is sponsored by my books ... | |
#1 New Release! |
FP Best Seller |
Copyright 1998-2024 Alvin Alexander, alvinalexander.com
All Rights Reserved.
A percentage of advertising revenue from
pages under the /java/jwarehouse
URI on this website is
paid back to open source projects.