Mercurial > hg > graal-jvmci-8
annotate jvmci/jdk.vm.ci.code/src/jdk/vm/ci/code/DataSection.java @ 22740:22110ef74a40
8144083 [JVMCI] CompilationResult should be finalized by JVMCI compiler and made effectively final
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Thu, 26 Nov 2015 00:47:01 +0100 |
| parents | 1bbd4a7c274b |
| children | 8c8c7e8b7ab2 |
| rev | line source |
|---|---|
| 22054 | 1 /* |
| 2 * Copyright (c) 2014, 2014, 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 */ | |
|
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23 package jdk.vm.ci.code; |
| 22054 | 24 |
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25 import static jdk.vm.ci.meta.MetaUtil.identityHashCodeString; |
| 22054 | 26 |
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27 import java.nio.ByteBuffer; |
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28 import java.util.ArrayList; |
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29 import java.util.Iterator; |
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30 import java.util.Objects; |
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31 import java.util.function.Consumer; |
| 22054 | 32 |
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33 import jdk.vm.ci.code.CompilationResult.DataPatch; |
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34 import jdk.vm.ci.code.CompilationResult.DataSectionReference; |
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35 import jdk.vm.ci.code.DataSection.Data; |
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36 import jdk.vm.ci.meta.SerializableConstant; |
| 22054 | 37 |
| 38 public final class DataSection implements Iterable<Data> { | |
| 39 | |
| 40 @FunctionalInterface | |
| 41 public interface DataBuilder { | |
| 42 | |
| 43 void emit(ByteBuffer buffer, Consumer<DataPatch> patch); | |
| 44 | |
| 45 static DataBuilder raw(byte[] data) { | |
| 46 return (buffer, patch) -> buffer.put(data); | |
| 47 } | |
| 48 | |
| 49 static DataBuilder serializable(SerializableConstant c) { | |
| 50 return (buffer, patch) -> c.serialize(buffer); | |
| 51 } | |
| 52 | |
| 53 static DataBuilder zero(int size) { | |
| 54 switch (size) { | |
| 55 case 1: | |
| 56 return (buffer, patch) -> buffer.put((byte) 0); | |
| 57 case 2: | |
| 58 return (buffer, patch) -> buffer.putShort((short) 0); | |
| 59 case 4: | |
| 60 return (buffer, patch) -> buffer.putInt(0); | |
| 61 case 8: | |
| 62 return (buffer, patch) -> buffer.putLong(0L); | |
| 63 default: | |
| 64 return (buffer, patch) -> { | |
| 65 int rest = size; | |
| 66 while (rest > 8) { | |
| 67 buffer.putLong(0L); | |
| 68 rest -= 8; | |
| 69 } | |
| 70 while (rest > 0) { | |
| 71 buffer.put((byte) 0); | |
| 72 rest--; | |
| 73 } | |
| 74 }; | |
| 75 } | |
| 76 } | |
| 77 } | |
| 78 | |
| 79 public static final class Data { | |
| 80 | |
| 81 private int alignment; | |
| 82 private final int size; | |
| 83 private final DataBuilder builder; | |
| 84 | |
| 85 private DataSectionReference ref; | |
| 86 | |
| 87 public Data(int alignment, int size, DataBuilder builder) { | |
| 88 this.alignment = alignment; | |
| 89 this.size = size; | |
| 90 this.builder = builder; | |
| 91 | |
| 92 // initialized in DataSection.insertData(Data) | |
| 93 ref = null; | |
| 94 } | |
| 95 | |
| 96 public void updateAlignment(int newAlignment) { | |
| 97 if (newAlignment == alignment) { | |
| 98 return; | |
| 99 } | |
| 100 alignment = lcm(alignment, newAlignment); | |
| 101 } | |
| 102 | |
| 103 public int getAlignment() { | |
| 104 return alignment; | |
| 105 } | |
| 106 | |
| 107 public int getSize() { | |
| 108 return size; | |
| 109 } | |
| 110 | |
| 111 public DataBuilder getBuilder() { | |
| 112 return builder; | |
| 113 } | |
| 114 | |
| 115 @Override | |
| 116 public int hashCode() { | |
| 117 // Data instances should not be used as hash map keys | |
| 118 throw new UnsupportedOperationException("hashCode"); | |
| 119 } | |
| 120 | |
| 121 @Override | |
| 122 public String toString() { | |
| 123 return identityHashCodeString(this); | |
| 124 } | |
| 125 | |
| 126 @Override | |
| 127 public boolean equals(Object obj) { | |
| 128 assert ref != null; | |
| 129 if (obj == this) { | |
| 130 return true; | |
| 131 } | |
| 132 if (obj instanceof Data) { | |
| 133 Data that = (Data) obj; | |
| 134 if (this.alignment == that.alignment && this.size == that.size && this.ref.equals(that.ref)) { | |
| 135 return true; | |
| 136 } | |
| 137 } | |
| 138 return false; | |
| 139 } | |
| 140 } | |
| 141 | |
| 142 private final ArrayList<Data> dataItems = new ArrayList<>(); | |
| 143 | |
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144 private boolean closed; |
| 22054 | 145 private int sectionAlignment; |
| 146 private int sectionSize; | |
| 147 | |
| 148 @Override | |
| 149 public int hashCode() { | |
| 150 // DataSection instances should not be used as hash map keys | |
| 151 throw new UnsupportedOperationException("hashCode"); | |
| 152 } | |
| 153 | |
| 154 @Override | |
| 155 public String toString() { | |
| 156 return identityHashCodeString(this); | |
| 157 } | |
| 158 | |
| 159 @Override | |
| 160 public boolean equals(Object obj) { | |
| 161 if (this == obj) { | |
| 162 return true; | |
| 163 } | |
| 164 if (obj instanceof DataSection) { | |
| 165 DataSection that = (DataSection) obj; | |
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166 if (this.closed == that.closed && this.sectionAlignment == that.sectionAlignment && this.sectionSize == that.sectionSize && Objects.equals(this.dataItems, that.dataItems)) { |
| 22054 | 167 return true; |
| 168 } | |
| 169 } | |
| 170 return false; | |
| 171 } | |
| 172 | |
| 173 /** | |
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174 * Inserts a {@link Data} item into the data section. If the item is already in the data |
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175 * section, the same {@link DataSectionReference} is returned. |
| 22054 | 176 * |
| 177 * @param data the {@link Data} item to be inserted | |
| 178 * @return a unique {@link DataSectionReference} identifying the {@link Data} item | |
| 179 */ | |
| 180 public DataSectionReference insertData(Data data) { | |
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181 checkOpen(); |
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182 synchronized (data) { |
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183 if (data.ref == null) { |
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184 data.ref = new DataSectionReference(); |
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185 dataItems.add(data); |
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186 } |
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187 return data.ref; |
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188 } |
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189 } |
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190 |
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191 /** |
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192 * Transfers all {@link Data} from the provided other {@link DataSection} to this |
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193 * {@link DataSection}, and empties the other section. |
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194 */ |
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195 public void addAll(DataSection other) { |
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196 checkOpen(); |
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197 other.checkOpen(); |
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198 |
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199 for (Data data : other.dataItems) { |
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200 assert data.ref != null; |
| 22054 | 201 dataItems.add(data); |
| 202 } | |
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203 other.dataItems.clear(); |
| 22054 | 204 } |
| 205 | |
| 206 /** | |
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207 * Determines if this object has been {@link #close() closed}. |
| 22054 | 208 */ |
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209 public boolean closed() { |
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210 return closed; |
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211 } |
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212 |
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213 /** |
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214 * Computes the layout of the data section and closes this object to further updates. |
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215 * |
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216 * This must be called exactly once. |
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217 */ |
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218 void close() { |
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219 checkOpen(); |
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220 closed = true; |
| 22054 | 221 |
| 222 // simple heuristic: put items with larger alignment requirement first | |
| 223 dataItems.sort((a, b) -> a.alignment - b.alignment); | |
| 224 | |
| 225 int position = 0; | |
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226 int alignment = 1; |
| 22054 | 227 for (Data d : dataItems) { |
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228 alignment = lcm(alignment, d.alignment); |
| 22054 | 229 position = align(position, d.alignment); |
| 230 | |
| 231 d.ref.setOffset(position); | |
| 232 position += d.size; | |
| 233 } | |
| 234 | |
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235 sectionAlignment = alignment; |
| 22054 | 236 sectionSize = position; |
| 237 } | |
| 238 | |
| 239 /** | |
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240 * Gets the size of the data section. |
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241 * |
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242 * This must only be called once this object has been {@linkplain #closed() closed}. |
| 22054 | 243 */ |
| 244 public int getSectionSize() { | |
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245 checkClosed(); |
| 22054 | 246 return sectionSize; |
| 247 } | |
| 248 | |
| 249 /** | |
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250 * Gets the minimum alignment requirement of the data section. |
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251 * |
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252 * This must only be called once this object has been {@linkplain #closed() closed}. |
| 22054 | 253 */ |
| 254 public int getSectionAlignment() { | |
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255 checkClosed(); |
| 22054 | 256 return sectionAlignment; |
| 257 } | |
| 258 | |
| 259 /** | |
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260 * Builds the data section into a given buffer. |
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261 * |
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262 * This must only be called once this object has been {@linkplain #closed() closed}. |
| 22054 | 263 * |
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264 * @param buffer the {@link ByteBuffer} where the data section should be built. The buffer must |
| 22054 | 265 * hold at least {@link #getSectionSize()} bytes. |
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266 * @param patch a {@link Consumer} to receive {@link DataPatch data patches} for relocations in |
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267 * the data section |
| 22054 | 268 */ |
| 269 public void buildDataSection(ByteBuffer buffer, Consumer<DataPatch> patch) { | |
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270 checkClosed(); |
| 22054 | 271 for (Data d : dataItems) { |
| 272 buffer.position(d.ref.getOffset()); | |
| 273 d.builder.emit(buffer, patch); | |
| 274 } | |
| 275 } | |
| 276 | |
| 277 public Data findData(DataSectionReference ref) { | |
| 278 for (Data d : dataItems) { | |
| 279 if (d.ref == ref) { | |
| 280 return d; | |
| 281 } | |
| 282 } | |
| 283 return null; | |
| 284 } | |
| 285 | |
| 286 public Iterator<Data> iterator() { | |
| 287 return dataItems.iterator(); | |
| 288 } | |
| 289 | |
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290 public static int lcm(int x, int y) { |
| 22054 | 291 if (x == 0) { |
| 292 return y; | |
| 293 } else if (y == 0) { | |
| 294 return x; | |
| 295 } | |
| 296 | |
| 297 int a = Math.max(x, y); | |
| 298 int b = Math.min(x, y); | |
| 299 while (b > 0) { | |
| 300 int tmp = a % b; | |
| 301 a = b; | |
| 302 b = tmp; | |
| 303 } | |
| 304 | |
| 305 int gcd = a; | |
| 306 return x * y / gcd; | |
| 307 } | |
| 308 | |
| 309 private static int align(int position, int alignment) { | |
| 310 return ((position + alignment - 1) / alignment) * alignment; | |
| 311 } | |
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312 |
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313 private void checkClosed() { |
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314 if (!closed) { |
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315 throw new IllegalStateException(); |
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316 } |
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317 } |
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318 |
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319 private void checkOpen() { |
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320 if (closed) { |
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321 throw new IllegalStateException(); |
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322 } |
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323 } |
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324 |
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325 public void clear() { |
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326 checkOpen(); |
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327 this.dataItems.clear(); |
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328 this.sectionAlignment = 0; |
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329 this.sectionSize = 0; |
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330 } |
| 22054 | 331 } |