Mercurial > hg > graal-compiler
annotate agent/src/share/classes/sun/jvm/hotspot/interpreter/BytecodeLoadConstant.java @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 2090c623107e |
| children |
| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 2002, 2012, 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.interpreter; | |
| 26 | |
| 27 import sun.jvm.hotspot.oops.*; | |
| 1602 | 28 import sun.jvm.hotspot.runtime.*; |
| 0 | 29 import sun.jvm.hotspot.utilities.*; |
| 30 | |
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31 public class BytecodeLoadConstant extends Bytecode { |
| 0 | 32 BytecodeLoadConstant(Method method, int bci) { |
| 33 super(method, bci); | |
| 34 } | |
| 35 | |
| 1602 | 36 public boolean hasCacheIndex() { |
| 37 // normal ldc uses CP index, but fast_aldc uses swapped CP cache index | |
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38 return code() >= Bytecodes.number_of_java_codes; |
| 1602 | 39 } |
| 40 | |
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41 int rawIndex() { |
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42 if (javaCode() == Bytecodes._ldc) |
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43 return getIndexU1(); |
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44 else |
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45 return getIndexU2(code(), false); |
| 1602 | 46 } |
| 47 | |
| 48 public int poolIndex() { | |
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49 int index = rawIndex(); |
| 1602 | 50 if (hasCacheIndex()) { |
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51 return method().getConstants().objectToCPIndex(index); |
| 1602 | 52 } else { |
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53 return index; |
| 1602 | 54 } |
| 55 } | |
| 56 | |
| 57 public int cacheIndex() { | |
| 58 if (hasCacheIndex()) { | |
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59 return rawIndex(); |
| 1602 | 60 } else { |
| 61 return -1; // no cache index | |
| 62 } | |
| 63 } | |
| 64 | |
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65 public BasicType resultType() { |
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66 int index = poolIndex(); |
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67 ConstantTag tag = method().getConstants().getTagAt(index); |
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68 return tag.basicType(); |
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69 } |
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70 |
| 1602 | 71 private Oop getCachedConstant() { |
| 72 int i = cacheIndex(); | |
| 73 if (i >= 0) { | |
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74 throw new InternalError("invokedynamic not implemented yet"); |
| 1602 | 75 } |
| 76 return null; | |
| 0 | 77 } |
| 78 | |
| 79 public void verify() { | |
| 80 if (Assert.ASSERTS_ENABLED) { | |
| 81 Assert.that(isValid(), "check load constant"); | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 public boolean isValid() { | |
| 86 int jcode = javaCode(); | |
| 87 boolean codeOk = jcode == Bytecodes._ldc || jcode == Bytecodes._ldc_w || | |
| 88 jcode == Bytecodes._ldc2_w; | |
| 89 if (! codeOk) return false; | |
| 90 | |
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91 ConstantTag ctag = method().getConstants().getTagAt(poolIndex()); |
| 0 | 92 if (jcode == Bytecodes._ldc2_w) { |
| 93 // has to be double or long | |
| 94 return (ctag.isDouble() || ctag.isLong()) ? true: false; | |
| 95 } else { | |
| 96 // has to be int or float or String or Klass | |
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97 return (ctag.isString() |
| 0 | 98 || ctag.isUnresolvedKlass() || ctag.isKlass() |
| 1602 | 99 || ctag.isMethodHandle() || ctag.isMethodType() |
| 0 | 100 || ctag.isInt() || ctag.isFloat())? true: false; |
| 101 } | |
| 102 } | |
| 103 | |
| 104 public boolean isKlassConstant() { | |
| 105 int jcode = javaCode(); | |
| 106 if (jcode == Bytecodes._ldc2_w) { | |
| 107 return false; | |
| 108 } | |
| 109 | |
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110 ConstantTag ctag = method().getConstants().getTagAt(poolIndex()); |
| 0 | 111 return ctag.isKlass() || ctag.isUnresolvedKlass(); |
| 112 } | |
| 113 | |
| 114 // return Symbol (if unresolved) or Klass (if resolved) | |
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115 public Object getKlass() { |
| 0 | 116 if (Assert.ASSERTS_ENABLED) { |
| 117 Assert.that(isKlassConstant(), "not a klass literal"); | |
| 118 } | |
| 119 // tag change from 'unresolved' to 'klass' does not happen atomically. | |
| 120 // We just look at the object at the corresponding index and | |
| 121 // decide based on the oop type. | |
| 122 ConstantPool cpool = method().getConstants(); | |
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123 int cpIndex = poolIndex(); |
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124 ConstantPool.CPSlot oop = cpool.getSlotAt(cpIndex); |
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125 if (oop.isResolved()) { |
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126 return oop.getKlass(); |
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127 } else if (oop.isUnresolved()) { |
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128 return oop.getSymbol(); |
| 0 | 129 } else { |
| 130 throw new RuntimeException("should not reach here"); | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 public static BytecodeLoadConstant at(Method method, int bci) { | |
| 135 BytecodeLoadConstant b = new BytecodeLoadConstant(method, bci); | |
| 136 if (Assert.ASSERTS_ENABLED) { | |
| 137 b.verify(); | |
| 138 } | |
| 139 return b; | |
| 140 } | |
| 141 | |
| 142 /** Like at, but returns null if the BCI is not at ldc or ldc_w or ldc2_w */ | |
| 143 public static BytecodeLoadConstant atCheck(Method method, int bci) { | |
| 144 BytecodeLoadConstant b = new BytecodeLoadConstant(method, bci); | |
| 145 return (b.isValid() ? b : null); | |
| 146 } | |
| 147 | |
| 148 public static BytecodeLoadConstant at(BytecodeStream bcs) { | |
| 149 return new BytecodeLoadConstant(bcs.method(), bcs.bci()); | |
| 150 } | |
| 151 | |
| 152 public String getConstantValue() { | |
| 153 ConstantPool cpool = method().getConstants(); | |
| 1602 | 154 int cpIndex = poolIndex(); |
| 0 | 155 ConstantTag ctag = cpool.getTagAt(cpIndex); |
| 156 if (ctag.isInt()) { | |
| 157 return "<int " + Integer.toString(cpool.getIntAt(cpIndex)) +">"; | |
| 158 } else if (ctag.isLong()) { | |
| 159 return "<long " + Long.toString(cpool.getLongAt(cpIndex)) + "L>"; | |
| 160 } else if (ctag.isFloat()) { | |
| 161 return "<float " + Float.toString(cpool.getFloatAt(cpIndex)) + "F>"; | |
| 162 } else if (ctag.isDouble()) { | |
| 163 return "<double " + Double.toString(cpool.getDoubleAt(cpIndex)) + "D>"; | |
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164 } else if (ctag.isString()) { |
| 0 | 165 // tag change from 'unresolved' to 'string' does not happen atomically. |
| 166 // We just look at the object at the corresponding index and | |
| 167 // decide based on the oop type. | |
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168 Symbol sym = cpool.getUnresolvedStringAt(cpIndex); |
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169 return "<String \"" + sym.asString() + "\">"; |
| 0 | 170 } else if (ctag.isKlass() || ctag.isUnresolvedKlass()) { |
| 171 // tag change from 'unresolved' to 'klass' does not happen atomically. | |
| 172 // We just look at the object at the corresponding index and | |
| 173 // decide based on the oop type. | |
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174 ConstantPool.CPSlot obj = cpool.getSlotAt(cpIndex); |
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175 if (obj.isResolved()) { |
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176 Klass k = obj.getKlass(); |
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177 return "<Class " + k.getName().asString() + "@" + k.getAddress() + ">"; |
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178 } else if (obj.isUnresolved()) { |
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179 Symbol sym = obj.getSymbol(); |
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180 return "<Class " + sym.asString() + ">"; |
| 0 | 181 } else { |
| 182 throw new RuntimeException("should not reach here"); | |
| 183 } | |
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184 } else if (ctag.isMethodHandle()) { |
| 1602 | 185 Oop x = getCachedConstant(); |
| 186 int refidx = cpool.getMethodHandleIndexAt(cpIndex); | |
| 187 int refkind = cpool.getMethodHandleRefKindAt(cpIndex); | |
| 188 return "<MethodHandle kind=" + Integer.toString(refkind) + | |
| 189 " ref=" + Integer.toString(refidx) | |
| 190 + (x == null ? "" : " @" + x.getHandle()) + ">"; | |
| 191 } else if (ctag.isMethodType()) { | |
| 192 Oop x = getCachedConstant(); | |
| 193 int refidx = cpool.getMethodTypeIndexAt(cpIndex); | |
| 194 return "<MethodType " + cpool.getSymbolAt(refidx).asString() | |
| 195 + (x == null ? "" : " @" + x.getHandle()) + ">"; | |
| 0 | 196 } else { |
| 197 if (Assert.ASSERTS_ENABLED) { | |
| 198 Assert.that(false, "invalid load constant type"); | |
| 199 } | |
| 200 return null; | |
| 201 } | |
| 202 } | |
| 203 | |
| 204 public String toString() { | |
| 205 StringBuffer buf = new StringBuffer(); | |
| 206 buf.append(getJavaBytecodeName()); | |
| 207 buf.append(spaces); | |
| 208 buf.append('#'); | |
| 1602 | 209 buf.append(Integer.toString(poolIndex())); |
| 210 if (hasCacheIndex()) { | |
| 211 buf.append('('); | |
| 212 buf.append(Integer.toString(cacheIndex())); | |
| 213 buf.append(')'); | |
| 214 } | |
| 0 | 215 buf.append(spaces); |
| 216 buf.append(getConstantValue()); | |
| 217 if (code() != javaCode()) { | |
| 218 buf.append(spaces); | |
| 219 buf.append('['); | |
| 220 buf.append(getBytecodeName()); | |
| 221 buf.append(']'); | |
| 222 } | |
| 223 return buf.toString(); | |
| 224 } | |
| 225 } |