1 /* 2 * Copyright (c) 2011, 2016, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package jdk.vm.ci.hotspot; 24 25 import jdk.vm.ci.meta.JavaMethodProfile; 26 import jdk.vm.ci.meta.JavaTypeProfile; 27 import jdk.vm.ci.meta.ProfilingInfo; 28 import jdk.vm.ci.meta.TriState; 29 30 /** 31 * Base class for accessing the different kinds of data in a HotSpot {@code MethodData}. This is 32 * similar to {@link ProfilingInfo}, but most methods require a {@link HotSpotMethodData} and the 33 * exact position within the method data. 34 */ 35 abstract class HotSpotMethodDataAccessor { 36 37 final int tag; 38 final int staticSize; 39 final HotSpotVMConfig config; 40 41 protected HotSpotMethodDataAccessor(HotSpotVMConfig config, int tag, int staticSize) { 42 this.config = config; 43 this.tag = tag; 44 this.staticSize = staticSize; 45 } 46 47 /** 48 * Returns the tag stored in the LayoutData header. 49 * 50 * @return tag stored in the LayoutData header 51 */ 52 int getTag() { 53 return tag; 54 } 55 56 static int readTag(HotSpotVMConfig config, HotSpotMethodData data, int position) { 57 final int tag = data.readUnsignedByte(position, config.dataLayoutTagOffset); 58 assert tag >= config.dataLayoutNoTag && tag <= config.dataLayoutSpeculativeTrapDataTag : "profile data tag out of bounds: " + tag; 59 return tag; 60 } 61 62 /** 63 * Returns the BCI stored in the LayoutData header. 64 * 65 * @return an integer between 0 and {@link Short#MAX_VALUE} inclusive, or -1 if not supported 66 */ 67 int getBCI(HotSpotMethodData data, int position) { 68 return data.readUnsignedShort(position, config.dataLayoutBCIOffset); 69 } 70 71 /** 72 * Computes the size for the specific data at the given position. 73 * 74 * @return a value greater than 0 75 */ 76 final int getSize(HotSpotMethodData data, int position) { 77 int size = staticSize + getDynamicSize(data, position); 78 // Sanity check against VM 79 int vmSize = HotSpotJVMCIRuntime.runtime().compilerToVm.methodDataProfileDataSize(data.metaspaceMethodData, position); 80 assert size == vmSize : size + " != " + vmSize; 81 return size; 82 } 83 84 TriState getExceptionSeen(HotSpotMethodData data, int position) { 85 final int exceptionsMask = 1 << config.bitDataExceptionSeenFlag; 86 return TriState.get((getFlags(data, position) & exceptionsMask) != 0); 87 } 88 89 /** 90 * @param data 91 * @param position 92 */ 93 JavaTypeProfile getTypeProfile(HotSpotMethodData data, int position) { 94 return null; 95 } 96 97 /** 98 * @param data 99 * @param position 100 */ 101 JavaMethodProfile getMethodProfile(HotSpotMethodData data, int position) { 102 return null; 103 } 104 105 /** 106 * @param data 107 * @param position 108 */ 109 double getBranchTakenProbability(HotSpotMethodData data, int position) { 110 return -1; 111 } 112 113 /** 114 * @param data 115 * @param position 116 */ 117 double[] getSwitchProbabilities(HotSpotMethodData data, int position) { 118 return null; 119 } 120 121 /** 122 * @param data 123 * @param position 124 */ 125 int getExecutionCount(HotSpotMethodData data, int position) { 126 return -1; 127 } 128 129 /** 130 * @param data 131 * @param position 132 */ 133 TriState getNullSeen(HotSpotMethodData data, int position) { 134 return TriState.UNKNOWN; 135 } 136 137 protected int getFlags(HotSpotMethodData data, int position) { 138 return data.readUnsignedByte(position, config.dataLayoutFlagsOffset); 139 } 140 141 /** 142 * @param data 143 * @param position 144 */ 145 protected int getDynamicSize(HotSpotMethodData data, int position) { 146 return 0; 147 } 148 149 abstract StringBuilder appendTo(StringBuilder sb, HotSpotMethodData data, int pos); 150 151 }