Mercurial > hg > graal-compiler
annotate agent/src/share/classes/sun/jvm/hotspot/oops/DataLayout.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 | 4bec1b1f7b33 |
| children |
| rev | line source |
|---|---|
| 3939 | 1 /* |
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6964458: Reimplement class meta-data storage to use native memory
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2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 3939 | 4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
| 3939 | 8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
| 3939 | 14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 3939 | 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. |
| 3939 | 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 public class DataLayout { | |
| 35 public static final int noTag = 0; | |
| 36 public static final int bitDataTag = 1; | |
| 37 public static final int counterDataTag = 2; | |
| 38 public static final int jumpDataTag= 3; | |
| 39 public static final int receiverTypeDataTag = 4; | |
| 40 public static final int virtualCallDataTag = 5; | |
| 41 public static final int retDataTag = 6; | |
| 42 public static final int branchDataTag = 7; | |
| 43 public static final int multiBranchDataTag = 8; | |
| 44 | |
| 45 // The _struct._flags word is formatted as [trapState:4 | flags:4]. | |
| 46 // The trap state breaks down further as [recompile:1 | reason:3]. | |
| 47 // This further breakdown is defined in deoptimization.cpp. | |
| 48 // See Deoptimization.trapStateReason for an assert that | |
| 49 // trapBits is big enough to hold reasons < reasonRecordedLimit. | |
| 50 // | |
| 51 // The trapState is collected only if ProfileTraps is true. | |
| 52 public static final int trapBits = 1+3; // 3: enough to distinguish [0..reasonRecordedLimit]. | |
| 53 public static final int trapShift = 8 - trapBits; | |
| 54 public static final int trapMask = Bits.rightNBits(trapBits); | |
| 55 public static final int trapMaskInPlace = (trapMask << trapShift); | |
| 56 public static final int flagLimit = trapShift; | |
| 57 public static final int flagMask = Bits.rightNBits(flagLimit); | |
| 58 public static final int firstFlag = 0; | |
| 59 | |
| 60 private Address data; | |
| 61 | |
| 62 private int offset; | |
| 63 | |
| 64 private boolean handlized; | |
| 65 | |
| 66 public DataLayout(MethodData d, int o) { | |
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67 data = d.getAddress(); |
| 3939 | 68 offset = o; |
| 69 } | |
| 70 | |
| 71 public DataLayout(Address d, int o) { | |
| 72 data = d; | |
| 73 offset = o; | |
| 74 handlized = true; | |
| 75 } | |
| 76 | |
| 77 public int dp() { return offset; } | |
| 78 | |
| 79 private int getU11(int at) { | |
| 80 return data.getJByteAt(offset + at) & 0xff; | |
| 81 } | |
| 82 | |
| 83 private int getU22(int at) { | |
| 84 return data.getJShortAt(offset + at) & 0xffff; | |
| 85 } | |
| 86 | |
| 87 int cellAt(int index) { | |
| 88 // Cells are intptr_t sized but only contain ints as raw values | |
| 89 return (int)data.getCIntegerAt(offset + cellOffset(index), MethodData.cellSize, false); | |
| 90 } | |
| 91 | |
| 92 public Address addressAt(int index) { | |
| 93 OopHandle handle; | |
| 94 if (handlized) { | |
| 95 return data.getAddressAt(offset + cellOffset(index)); | |
| 96 } else { | |
| 97 return data.getOopHandleAt(offset + cellOffset(index)); | |
| 98 } | |
| 99 } | |
| 100 | |
| 101 // Every data layout begins with a header. This header | |
| 102 // contains a tag, which is used to indicate the size/layout | |
| 103 // of the data, 4 bits of flags, which can be used in any way, | |
| 104 // 4 bits of trap history (none/one reason/many reasons), | |
| 105 // and a bci, which is used to tie this piece of data to a | |
| 106 // specific bci in the bytecodes. | |
| 107 // union { | |
| 108 // intptrT _bits; | |
| 109 // struct { | |
| 110 // u1 _tag; | |
| 111 // u1 _flags; | |
| 112 // u2 _bci; | |
| 113 // } _struct; | |
| 114 // } _header; | |
| 115 | |
| 116 // Some types of data layouts need a length field. | |
| 117 static boolean needsArrayLen(int tag) { | |
| 118 return (tag == multiBranchDataTag); | |
| 119 } | |
| 120 | |
| 121 public static final int counterIncrement = 1; | |
| 122 | |
| 123 // Size computation | |
| 124 static int headerSizeInBytes() { | |
| 125 return MethodData.cellSize; | |
| 126 } | |
| 127 static int headerSizeInCells() { | |
| 128 return 1; | |
| 129 } | |
| 130 | |
| 131 static int computeSizeInBytes(int cellCount) { | |
| 132 return headerSizeInBytes() + cellCount * MethodData.cellSize; | |
| 133 } | |
| 134 | |
| 135 // Initialization | |
| 136 // void initialize(int tag, int bci, int cellCount); | |
| 137 | |
| 138 // Accessors | |
| 139 public int tag() { | |
| 140 return getU11(0); | |
| 141 } | |
| 142 | |
| 143 // Return a few bits of trap state. Range is [0..trapMask]. | |
| 144 // The state tells if traps with zero, one, or many reasons have occurred. | |
| 145 // It also tells whether zero or many recompilations have occurred. | |
| 146 // The associated trap histogram in the MDO itself tells whether | |
| 147 // traps are common or not. If a BCI shows that a trap X has | |
| 148 // occurred, and the MDO shows N occurrences of X, we make the | |
| 149 // simplifying assumption that all N occurrences can be blamed | |
| 150 // on that BCI. | |
| 151 int trapState() { | |
| 152 return (flags() >> trapShift) & trapMask; | |
| 153 } | |
| 154 | |
| 155 int flags() { | |
| 156 return getU11(1); | |
| 157 } | |
| 158 | |
| 159 int bci() { | |
| 160 return getU22(2); | |
| 161 } | |
| 162 | |
| 163 boolean flagAt(int flagNumber) { | |
| 164 // assert(flagNumber < flagLimit, "oob"); | |
| 165 return (flags() & (0x1 << flagNumber)) != 0; | |
| 166 } | |
| 167 | |
| 168 // Low-level support for code generation. | |
| 169 static int headerOffset() { | |
| 170 return 0; | |
| 171 } | |
| 172 static int tagOffset() { | |
| 173 return 0; | |
| 174 } | |
| 175 static int flagsOffset() { | |
| 176 return 1; | |
| 177 } | |
| 178 static int bciOffset() { | |
| 179 return 2; | |
| 180 } | |
| 181 public static int cellOffset(int index) { | |
| 182 return MethodData.cellSize + index * MethodData.cellSize; | |
| 183 } | |
| 184 // // Return a value which, when or-ed as a byte into _flags, sets the flag. | |
| 185 // static int flagNumberToByteConstant(int flagNumber) { | |
| 186 // assert(0 <= flagNumber && flagNumber < flagLimit, "oob"); | |
| 187 // DataLayout temp; temp.setHeader(0); | |
| 188 // temp.setFlagAt(flagNumber); | |
| 189 // return temp._header._struct._flags; | |
| 190 // } | |
| 191 // // Return a value which, when or-ed as a word into _header, sets the flag. | |
| 192 // static intptrT flagMaskToHeaderMask(int byteConstant) { | |
| 193 // DataLayout temp; temp.setHeader(0); | |
| 194 // temp._header._struct._flags = byteConstant; | |
| 195 // return temp._header._bits; | |
| 196 // } | |
| 197 } |