Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/oops/Symbol.java @ 3939:f6f3bb0ee072
7088955: add C2 IR support to the SA
Reviewed-by: kvn
| author | never |
|---|---|
| date | Sun, 11 Sep 2011 14:48:24 -0700 |
| parents | 1d1603768966 |
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| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 2000, 2011, 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 | |
| 34 // A Symbol is a canonicalized string. | |
| 35 // All Symbols reside in global symbolTable. | |
| 36 | |
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37 public class Symbol extends VMObject { |
| 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 { | |
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47 Type type = db.lookupType("Symbol"); |
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48 length = type.getCIntegerField("_length"); |
| 0 | 49 baseOffset = type.getField("_body").getOffset(); |
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50 idHash = type.getCIntegerField("_identity_hash"); |
| 0 | 51 } |
| 52 | |
| 53 // Format: | |
| 54 // [header] | |
| 55 // [klass ] | |
| 56 // [length] byte size of uft8 string | |
| 57 // ..body.. | |
| 58 | |
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59 public static Symbol create(Address addr) { |
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60 if (addr == null) { |
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61 return null; |
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62 } |
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63 return new Symbol(addr); |
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64 } |
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65 |
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66 Symbol(Address addr) { |
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67 super(addr); |
| 0 | 68 } |
| 69 | |
| 70 public boolean isSymbol() { return true; } | |
| 71 | |
| 72 private static long baseOffset; // tells where the array part starts | |
| 73 | |
| 74 // Fields | |
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75 private static CIntegerField length; |
| 0 | 76 |
| 77 // Accessors for declared fields | |
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78 public long getLength() { return length.getValue(this.addr); } |
| 0 | 79 |
| 80 public byte getByteAt(long index) { | |
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81 return addr.getJByteAt(baseOffset + index); |
| 0 | 82 } |
| 83 | |
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84 private static CIntegerField idHash; |
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85 |
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86 public int identityHash() { return (int)idHash.getValue(this.addr); } |
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87 |
| 0 | 88 public boolean equals(byte[] modUTF8Chars) { |
| 89 int l = (int) getLength(); | |
| 90 if (l != modUTF8Chars.length) return false; | |
| 91 while (l-- > 0) { | |
| 92 if (modUTF8Chars[l] != getByteAt(l)) return false; | |
| 93 } | |
| 94 if (Assert.ASSERTS_ENABLED) { | |
| 95 Assert.that(l == -1, "we should be at the beginning"); | |
| 96 } | |
| 97 return true; | |
| 98 } | |
| 99 | |
| 100 public byte[] asByteArray() { | |
| 101 int length = (int) getLength(); | |
| 102 byte [] result = new byte [length]; | |
| 103 for (int index = 0; index < length; index++) { | |
| 104 result[index] = getByteAt(index); | |
| 105 } | |
| 106 return result; | |
| 107 } | |
| 108 | |
| 109 public String asString() { | |
| 110 // Decode the byte array and return the string. | |
| 111 try { | |
| 112 return readModifiedUTF8(asByteArray()); | |
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113 } catch(Exception e) { |
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114 System.err.println(addr); |
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115 e.printStackTrace(); |
| 0 | 116 return null; |
| 117 } | |
| 118 } | |
| 119 | |
| 120 public boolean startsWith(String str) { | |
| 121 return asString().startsWith(str); | |
| 122 } | |
| 123 | |
| 124 public void printValueOn(PrintStream tty) { | |
| 125 tty.print("#" + asString()); | |
| 126 } | |
| 127 | |
| 128 /** Note: this comparison is used for vtable sorting only; it | |
| 129 doesn't matter what order it defines, as long as it is a total, | |
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130 time-invariant order Since Symbol* are in C_HEAP, their |
| 0 | 131 relative order in memory never changes, so use address |
| 132 comparison for speed. */ | |
| 133 public int fastCompare(Symbol other) { | |
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134 return (int) addr.minus(other.addr); |
| 0 | 135 } |
| 136 | |
| 137 private static String readModifiedUTF8(byte[] buf) throws IOException { | |
| 138 final int len = buf.length; | |
| 139 byte[] tmp = new byte[len + 2]; | |
| 140 // write modified UTF-8 length as short in big endian | |
| 141 tmp[0] = (byte) ((len >>> 8) & 0xFF); | |
| 142 tmp[1] = (byte) ((len >>> 0) & 0xFF); | |
| 143 // copy the data | |
| 144 System.arraycopy(buf, 0, tmp, 2, len); | |
| 145 DataInputStream dis = new DataInputStream(new ByteArrayInputStream(tmp)); | |
| 146 return dis.readUTF(); | |
| 147 } | |
| 148 } |