jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/jvm/Pool.java@0e5899f09dab (annotated)

src/share/classes/com/sun/tools/javac/jvm/Pool.java@0e5899f09dab (annotated)

src/share/classes/com/sun/tools/javac/jvm/Pool.java

Tue, 25 Sep 2012 13:06:58 -0700

author: jjg
date: Tue, 25 Sep 2012 13:06:58 -0700
changeset 1339: 0e5899f09dab
parent 1336: 26d93df3905a
child 1342: 1a65d6565b45
permissions: -rw-r--r--

7193657: provide internal ArrayUtils class to simplify common usage of arrays in javac
Reviewed-by: mcimadamore, jjg
Contributed-by: vicenterz@yahoo.es

 /*
  * Copyright (c) 1999, 2012, 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 com.sun.tools.javac.jvm;
 import com.sun.tools.javac.code.Flags;
 import com.sun.tools.javac.code.Kinds;
 import java.util.*;
 import com.sun.tools.javac.code.Symbol;
 import com.sun.tools.javac.code.Symbol.*;
 import com.sun.tools.javac.code.Type;
 import com.sun.tools.javac.util.ArrayUtils;
 import com.sun.tools.javac.util.Assert;
 import com.sun.tools.javac.util.Filter;
 import com.sun.tools.javac.util.Name;
 import com.sun.tools.javac.util.Names;
 /** An internal structure that corresponds to the constant pool of a classfile.
  *
  *  <p><b>This is NOT part of any supported API.
  *  If you write code that depends on this, you do so at your own risk.
  *  This code and its internal interfaces are subject to change or
  *  deletion without notice.</b>
  */
 public class Pool {
     public static final int MAX_ENTRIES = 0xFFFF;
     public static final int MAX_STRING_LENGTH = 0xFFFF;
     /** Index of next constant to be entered.
      */
     int pp;
     /** The initial pool buffer.
      */
     Object[] pool;
     /** A hashtable containing all constants in the pool.
      */
     Map<Object,Integer> indices;
     /** Construct a pool with given number of elements and element array.
      */
     public Pool(int pp, Object[] pool) {
         this.pp = pp;
         this.pool = pool;
         this.indices = new HashMap<Object,Integer>(pool.length);
         for (int i = 1; i < pp; i++) {
             if (pool[i] != null) indices.put(pool[i], i);
         }
     }
     /** Construct an empty pool.
      */
     public Pool() {
         this(1, new Object[64]);
     }
     /** Return the number of entries in the constant pool.
      */
     public int numEntries() {
         return pp;
     }
     /** Remove everything from this pool.
      */
     public void reset() {
         pp = 1;
         indices.clear();
     }
     /** Place an object in the pool, unless it is already there.
      *  If object is a symbol also enter its owner unless the owner is a
      *  package.  Return the object's index in the pool.
      */
     public int put(Object value) {
         if (value instanceof MethodSymbol)
             value = new Method((MethodSymbol)value);
         else if (value instanceof VarSymbol)
             value = new Variable((VarSymbol)value);
 //      assert !(value instanceof Type.TypeVar);
         Integer index = indices.get(value);
         if (index == null) {
 //          System.err.println("put " + value + " " + value.getClass());//DEBUG
             index = pp;
             indices.put(value, index);
             pool = ArrayUtils.ensureCapacity(pool, pp);
             pool[pp++] = value;
             if (value instanceof Long || value instanceof Double) {
                 pool = ArrayUtils.ensureCapacity(pool, pp);
                 pool[pp++] = null;
             }
         }
         return index.intValue();
     }
     /** Return the given object's index in the pool,
      *  or -1 if object is not in there.
      */
     public int get(Object o) {
         Integer n = indices.get(o);
         return n == null ? -1 : n.intValue();
     }
     static class Method extends DelegatedSymbol {
         MethodSymbol m;
         Method(MethodSymbol m) {
             super(m);
             this.m = m;
         }
         public boolean equals(Object other) {
             if (!(other instanceof Method)) return false;
             MethodSymbol o = ((Method)other).m;
             return
                 o.name == m.name &&
                 o.owner == m.owner &&
                 o.type.equals(m.type);
         }
         public int hashCode() {
             return
                 m.name.hashCode() * 33 +
                 m.owner.hashCode() * 9 +
                 m.type.hashCode();
         }
     }
     static class Variable extends DelegatedSymbol {
         VarSymbol v;
         Variable(VarSymbol v) {
             super(v);
             this.v = v;
         }
         public boolean equals(Object other) {
             if (!(other instanceof Variable)) return false;
             VarSymbol o = ((Variable)other).v;
             return
                 o.name == v.name &&
                 o.owner == v.owner &&
                 o.type.equals(v.type);
         }
         public int hashCode() {
             return
                 v.name.hashCode() * 33 +
                 v.owner.hashCode() * 9 +
                 v.type.hashCode();
         }
     }
     public static class MethodHandle {
         /** Reference kind - see ClassFile */
         int refKind;
         /** Reference symbol */
         Symbol refSym;
         /** Reference to the name table */
         Names names;
         public MethodHandle(int refKind, Symbol refSym, Names names) {
             this.refKind = refKind;
             this.refSym = refSym;
             this.names = names;
             checkConsistent();
         }
         public boolean equals(Object other) {
             if (!(other instanceof MethodHandle)) return false;
             MethodHandle mr = (MethodHandle) other;
             if (mr.refKind != refKind)  return false;
             Symbol o = mr.refSym;
             return
                 o.name == refSym.name &&
                 o.owner == refSym.owner &&
                 o.type.equals(refSym.type);
         }
         public int hashCode() {
             return
                 refKind * 65 +
                 refSym.name.hashCode() * 33 +
                 refSym.owner.hashCode() * 9 +
                 refSym.type.hashCode();
         }
         /**
          * Check consistency of reference kind and symbol (see JVMS 4.4.8)
          */
         @SuppressWarnings("fallthrough")
         private void checkConsistent() {
             boolean staticOk = false;
             int expectedKind = -1;
             Filter<Name> nameFilter = nonInitFilter;
             boolean interfaceOwner = false;
             switch (refKind) {
                 case ClassFile.REF_getStatic:
                 case ClassFile.REF_putStatic:
                     staticOk = true;
                 case ClassFile.REF_getField:
                 case ClassFile.REF_putField:
                     expectedKind = Kinds.VAR;
                     break;
                 case ClassFile.REF_newInvokeSpecial:
                     nameFilter = initFilter;
                     expectedKind = Kinds.MTH;
                     break;
                 case ClassFile.REF_invokeInterface:
                     interfaceOwner = true;
                     expectedKind = Kinds.MTH;
                     break;
                 case ClassFile.REF_invokeStatic:
                     staticOk = true;
                 case ClassFile.REF_invokeVirtual:
                 case ClassFile.REF_invokeSpecial:
                     expectedKind = Kinds.MTH;
                     break;
             }
             Assert.check(!refSym.isStatic() || staticOk);
             Assert.check(refSym.kind == expectedKind);
             Assert.check(nameFilter.accepts(refSym.name));
             Assert.check(!refSym.owner.isInterface() || interfaceOwner);
         }
         //where
                 Filter<Name> nonInitFilter = new Filter<Name>() {
                     public boolean accepts(Name n) {
                         return n != names.init && n != names.clinit;
                     }
                 };
                 Filter<Name> initFilter = new Filter<Name>() {
                     public boolean accepts(Name n) {
                         return n == names.init;
                     }
                 };
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/jvm/Pool.java@0e5899f09dab (annotated)

src/share/classes/com/sun/tools/javac/jvm/Pool.java