Mercurial > hg > graal-jvmci-8
view agent/src/share/classes/sun/jvm/hotspot/oops/Symbol.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 | 3582bf76420e |
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/* * Copyright (c) 2000, 2004, 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. * * 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.jvm.hotspot.oops; import java.io.*; import java.util.*; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.runtime.*; import sun.jvm.hotspot.types.*; import sun.jvm.hotspot.utilities.*; // A Symbol is a canonicalized string. // All Symbols reside in global symbolTable. public class Symbol extends Oop { static { VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } }); } private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { Type type = db.lookupType("symbolOopDesc"); length = new CIntField(type.getCIntegerField("_length"), 0); baseOffset = type.getField("_body").getOffset(); } // Format: // [header] // [klass ] // [length] byte size of uft8 string // ..body.. Symbol(OopHandle handle, ObjectHeap heap) { super(handle, heap); } public boolean isSymbol() { return true; } private static long baseOffset; // tells where the array part starts // Fields private static CIntField length; // Accessors for declared fields public long getLength() { return length.getValue(this); } public byte getByteAt(long index) { return getHandle().getJByteAt(baseOffset + index); } public boolean equals(byte[] modUTF8Chars) { int l = (int) getLength(); if (l != modUTF8Chars.length) return false; while (l-- > 0) { if (modUTF8Chars[l] != getByteAt(l)) return false; } if (Assert.ASSERTS_ENABLED) { Assert.that(l == -1, "we should be at the beginning"); } return true; } public byte[] asByteArray() { int length = (int) getLength(); byte [] result = new byte [length]; for (int index = 0; index < length; index++) { result[index] = getByteAt(index); } return result; } public String asString() { // Decode the byte array and return the string. try { return readModifiedUTF8(asByteArray()); } catch(IOException e) { return null; } } public boolean startsWith(String str) { return asString().startsWith(str); } public void printValueOn(PrintStream tty) { tty.print("#" + asString()); } public long getObjectSize() { return alignObjectSize(baseOffset + getLength()); } void iterateFields(OopVisitor visitor, boolean doVMFields) { super.iterateFields(visitor, doVMFields); if (doVMFields) { visitor.doCInt(length, true); int length = (int) getLength(); for (int index = 0; index < length; index++) { visitor.doByte(new ByteField(new IndexableFieldIdentifier(index), baseOffset + index, false), true); } } } /** Note: this comparison is used for vtable sorting only; it doesn't matter what order it defines, as long as it is a total, time-invariant order Since symbolOops are in permSpace, their relative order in memory never changes, so use address comparison for speed. */ public int fastCompare(Symbol other) { return (int) getHandle().minus(other.getHandle()); } private static String readModifiedUTF8(byte[] buf) throws IOException { final int len = buf.length; byte[] tmp = new byte[len + 2]; // write modified UTF-8 length as short in big endian tmp[0] = (byte) ((len >>> 8) & 0xFF); tmp[1] = (byte) ((len >>> 0) & 0xFF); // copy the data System.arraycopy(buf, 0, tmp, 2, len); DataInputStream dis = new DataInputStream(new ByteArrayInputStream(tmp)); return dis.readUTF(); } }