Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/interpreter/BytecodeLoadConstant.java @ 2177:3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank
| author | coleenp |
|---|---|
| date | Thu, 27 Jan 2011 16:11:27 -0800 |
| parents | 3b2dea75431e |
| children | 1d1603768966 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2002, 2010, 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 | |
| 31 public class BytecodeLoadConstant extends BytecodeWithCPIndex { | |
| 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 | |
| 38 return javaCode() != code(); | |
| 39 } | |
| 40 | |
| 0 | 41 public int index() { |
| 1602 | 42 int i = javaCode() == Bytecodes._ldc ? |
| 0 | 43 (int) (0xFF & javaByteAt(1)) |
| 44 : (int) (0xFFFF & javaShortAt(1)); | |
| 1602 | 45 if (hasCacheIndex()) { |
| 46 return (0xFFFF & VM.getVM().getBytes().swapShort((short) i)); | |
| 47 } else { | |
| 48 return i; | |
| 49 } | |
| 50 } | |
| 51 | |
| 52 public int poolIndex() { | |
| 53 int i = index(); | |
| 54 if (hasCacheIndex()) { | |
| 55 ConstantPoolCache cpCache = method().getConstants().getCache(); | |
| 56 return cpCache.getEntryAt(i).getConstantPoolIndex(); | |
| 57 } else { | |
| 58 return i; | |
| 59 } | |
| 60 } | |
| 61 | |
| 62 public int cacheIndex() { | |
| 63 if (hasCacheIndex()) { | |
| 64 return index(); | |
| 65 } else { | |
| 66 return -1; // no cache index | |
| 67 } | |
| 68 } | |
| 69 | |
| 70 private Oop getCachedConstant() { | |
| 71 int i = cacheIndex(); | |
| 72 if (i >= 0) { | |
| 73 ConstantPoolCache cpCache = method().getConstants().getCache(); | |
| 74 return cpCache.getEntryAt(i).getF1(); | |
| 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 | |
| 91 ConstantTag ctag = method().getConstants().getTagAt(index()); | |
| 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 | |
| 97 return (ctag.isUnresolvedString() || ctag.isString() | |
| 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 | |
| 110 ConstantTag ctag = method().getConstants().getTagAt(index()); | |
| 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(); | |
| 123 int cpIndex = index(); | |
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124 ConstantPool.CPSlot oop = cpool.getSlotAt(cpIndex); |
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125 if (oop.isOop()) { |
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126 return (Klass) oop.getOop(); |
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127 } else if (oop.isMetaData()) { |
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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>"; | |
| 164 } else if (ctag.isString() || ctag.isUnresolvedString()) { | |
| 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 ConstantPool.CPSlot obj = cpool.getSlotAt(cpIndex); |
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169 if (obj.isMetaData()) { |
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170 Symbol sym = obj.getSymbol(); |
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171 return "<String \"" + sym.asString() + "\">"; |
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172 } else if (obj.isOop()) { |
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173 return "<String \"" + OopUtilities.stringOopToString(obj.getOop()) + "\">"; |
| 0 | 174 } else { |
| 175 throw new RuntimeException("should not reach here"); | |
| 176 } | |
| 177 } else if (ctag.isKlass() || ctag.isUnresolvedKlass()) { | |
| 178 // tag change from 'unresolved' to 'klass' does not happen atomically. | |
| 179 // We just look at the object at the corresponding index and | |
| 180 // decide based on the oop type. | |
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181 ConstantPool.CPSlot obj = cpool.getSlotAt(cpIndex); |
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182 if (obj.isOop()) { |
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183 Klass k = (Klass) obj.getOop(); |
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184 return "<Class " + k.getName().asString() + "@" + k.getHandle() + ">"; |
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185 } else if (obj.isMetaData()) { |
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186 Symbol sym = obj.getSymbol(); |
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187 return "<Class " + sym.asString() + ">"; |
| 0 | 188 } else { |
| 189 throw new RuntimeException("should not reach here"); | |
| 190 } | |
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191 } else if (ctag.isMethodHandle()) { |
| 1602 | 192 Oop x = getCachedConstant(); |
| 193 int refidx = cpool.getMethodHandleIndexAt(cpIndex); | |
| 194 int refkind = cpool.getMethodHandleRefKindAt(cpIndex); | |
| 195 return "<MethodHandle kind=" + Integer.toString(refkind) + | |
| 196 " ref=" + Integer.toString(refidx) | |
| 197 + (x == null ? "" : " @" + x.getHandle()) + ">"; | |
| 198 } else if (ctag.isMethodType()) { | |
| 199 Oop x = getCachedConstant(); | |
| 200 int refidx = cpool.getMethodTypeIndexAt(cpIndex); | |
| 201 return "<MethodType " + cpool.getSymbolAt(refidx).asString() | |
| 202 + (x == null ? "" : " @" + x.getHandle()) + ">"; | |
| 0 | 203 } else { |
| 204 if (Assert.ASSERTS_ENABLED) { | |
| 205 Assert.that(false, "invalid load constant type"); | |
| 206 } | |
| 207 return null; | |
| 208 } | |
| 209 } | |
| 210 | |
| 211 public String toString() { | |
| 212 StringBuffer buf = new StringBuffer(); | |
| 213 buf.append(getJavaBytecodeName()); | |
| 214 buf.append(spaces); | |
| 215 buf.append('#'); | |
| 1602 | 216 buf.append(Integer.toString(poolIndex())); |
| 217 if (hasCacheIndex()) { | |
| 218 buf.append('('); | |
| 219 buf.append(Integer.toString(cacheIndex())); | |
| 220 buf.append(')'); | |
| 221 } | |
| 0 | 222 buf.append(spaces); |
| 223 buf.append(getConstantValue()); | |
| 224 if (code() != javaCode()) { | |
| 225 buf.append(spaces); | |
| 226 buf.append('['); | |
| 227 buf.append(getBytecodeName()); | |
| 228 buf.append(']'); | |
| 229 } | |
| 230 return buf.toString(); | |
| 231 } | |
| 232 } |