Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/oops/ConstantPoolCache.java @ 1602:136b78722a08
6939203: JSR 292 needs method handle constants
Summary: Add new CP types CONSTANT_MethodHandle, CONSTANT_MethodType; extend 'ldc' bytecode.
Reviewed-by: twisti, never
| author | jrose |
|---|---|
| date | Wed, 09 Jun 2010 18:50:45 -0700 |
| parents | c18cbe5936b8 |
| children | 0a8e0d4345b3 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 package sun.jvm.hotspot.oops; | |
| 26 | |
| 27 import java.io.*; | |
| 28 import java.util.*; | |
| 29 import sun.jvm.hotspot.debugger.*; | |
| 30 import sun.jvm.hotspot.runtime.*; | |
| 31 import sun.jvm.hotspot.types.*; | |
| 32 import sun.jvm.hotspot.utilities.*; | |
| 33 | |
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34 // ConstantPoolCache : A constant pool cache (constantPoolCacheOopDesc). |
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35 // See cpCacheOop.hpp for details about this class. |
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36 // |
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37 public class ConstantPoolCache extends Oop { |
| 0 | 38 static { |
| 39 VM.registerVMInitializedObserver(new Observer() { | |
| 40 public void update(Observable o, Object data) { | |
| 41 initialize(VM.getVM().getTypeDataBase()); | |
| 42 } | |
| 43 }); | |
| 44 } | |
| 45 | |
| 46 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { | |
| 47 Type type = db.lookupType("constantPoolCacheOopDesc"); | |
| 48 constants = new OopField(type.getOopField("_constant_pool"), 0); | |
| 49 baseOffset = type.getSize(); | |
| 50 Type elType = db.lookupType("ConstantPoolCacheEntry"); | |
| 51 elementSize = elType.getSize(); | |
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52 length = new CIntField(type.getCIntegerField("_length"), 0); |
| 0 | 53 } |
| 54 | |
| 55 ConstantPoolCache(OopHandle handle, ObjectHeap heap) { | |
| 56 super(handle, heap); | |
| 57 } | |
| 58 | |
| 59 public boolean isConstantPoolCache() { return true; } | |
| 60 | |
| 61 private static OopField constants; | |
| 62 | |
| 63 private static long baseOffset; | |
| 64 private static long elementSize; | |
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65 private static CIntField length; |
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66 |
| 0 | 67 |
| 68 public ConstantPool getConstants() { return (ConstantPool) constants.getValue(this); } | |
| 69 | |
| 70 public long getObjectSize() { | |
| 71 return alignObjectSize(baseOffset + getLength() * elementSize); | |
| 72 } | |
| 73 | |
| 74 public ConstantPoolCacheEntry getEntryAt(int i) { | |
| 75 if (Assert.ASSERTS_ENABLED) { | |
| 76 Assert.that(0 <= i && i < getLength(), "index out of bounds"); | |
| 77 } | |
| 78 return new ConstantPoolCacheEntry(this, i); | |
| 79 } | |
| 80 | |
| 1602 | 81 public static boolean isSecondaryIndex(int i) { return (i < 0); } |
| 82 public static int decodeSecondaryIndex(int i) { return isSecondaryIndex(i) ? ~i : i; } | |
| 83 public static int encodeSecondaryIndex(int i) { return !isSecondaryIndex(i) ? ~i : i; } | |
| 84 | |
| 85 // secondary entries hold invokedynamic call site bindings | |
| 86 public ConstantPoolCacheEntry getSecondaryEntryAt(int i) { | |
| 87 ConstantPoolCacheEntry e = new ConstantPoolCacheEntry(this, decodeSecondaryIndex(i)); | |
| 88 if (Assert.ASSERTS_ENABLED) { | |
| 89 Assert.that(e.isSecondaryEntry(), "must be a secondary entry"); | |
| 90 } | |
| 91 return e; | |
| 92 } | |
| 93 | |
| 94 public ConstantPoolCacheEntry getMainEntryAt(int i) { | |
| 95 if (isSecondaryIndex(i)) { | |
| 96 // run through an extra level of indirection: | |
| 97 i = getSecondaryEntryAt(i).getMainEntryIndex(); | |
| 98 } | |
| 99 ConstantPoolCacheEntry e = new ConstantPoolCacheEntry(this, i); | |
| 100 if (Assert.ASSERTS_ENABLED) { | |
| 101 Assert.that(!e.isSecondaryEntry(), "must not be a secondary entry"); | |
| 102 } | |
| 103 return e; | |
| 104 } | |
| 105 | |
| 0 | 106 public int getIntAt(int entry, int fld) { |
| 107 //alignObjectSize ? | |
| 108 long offset = baseOffset + /*alignObjectSize*/entry * elementSize + fld* getHeap().getIntSize(); | |
| 109 return (int) getHandle().getCIntegerAt(offset, getHeap().getIntSize(), true ); | |
| 110 } | |
| 111 | |
| 112 | |
| 113 public void printValueOn(PrintStream tty) { | |
| 114 tty.print("ConstantPoolCache for " + getConstants().getPoolHolder().getName().asString()); | |
| 115 } | |
| 116 | |
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117 public int getLength() { |
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118 return (int) length.getValue(this); |
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119 } |
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120 |
| 0 | 121 public void iterateFields(OopVisitor visitor, boolean doVMFields) { |
| 122 super.iterateFields(visitor, doVMFields); | |
| 123 if (doVMFields) { | |
| 124 visitor.doOop(constants, true); | |
| 125 for (int i = 0; i < getLength(); i++) { | |
| 126 ConstantPoolCacheEntry entry = getEntryAt(i); | |
| 127 entry.iterateFields(visitor); | |
| 128 } | |
| 129 } | |
| 130 } | |
| 131 }; |