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 org.graalvm.compiler.phases.common.inlining.walker; 24 25 import static org.graalvm.compiler.core.common.GraalOptions.Intrinsify; 26 import static org.graalvm.compiler.core.common.GraalOptions.MaximumRecursiveInlining; 27 import static org.graalvm.compiler.core.common.GraalOptions.MegamorphicInliningMinMethodProbability; 28 29 import java.util.ArrayDeque; 30 import java.util.ArrayList; 31 import java.util.BitSet; 32 import java.util.Collection; 33 import java.util.Iterator; 34 import java.util.LinkedList; 35 import java.util.List; 36 37 import org.graalvm.compiler.core.common.type.ObjectStamp; 38 import org.graalvm.compiler.debug.CounterKey; 39 import org.graalvm.compiler.debug.DebugContext; 40 import org.graalvm.compiler.debug.GraalError; 41 import org.graalvm.compiler.graph.Graph; 42 import org.graalvm.compiler.graph.Node; 43 import org.graalvm.compiler.nodes.CallTargetNode; 44 import org.graalvm.compiler.nodes.Invoke; 45 import org.graalvm.compiler.nodes.ParameterNode; 46 import org.graalvm.compiler.nodes.StructuredGraph; 47 import org.graalvm.compiler.nodes.ValueNode; 48 import org.graalvm.compiler.nodes.java.AbstractNewObjectNode; 49 import org.graalvm.compiler.nodes.java.MethodCallTargetNode; 50 import org.graalvm.compiler.nodes.virtual.AllocatedObjectNode; 51 import org.graalvm.compiler.nodes.virtual.VirtualObjectNode; 52 import org.graalvm.compiler.options.OptionValues; 53 import org.graalvm.compiler.phases.OptimisticOptimizations; 54 import org.graalvm.compiler.phases.common.CanonicalizerPhase; 55 import org.graalvm.compiler.phases.common.inlining.InliningUtil; 56 import org.graalvm.compiler.phases.common.inlining.info.AssumptionInlineInfo; 57 import org.graalvm.compiler.phases.common.inlining.info.ExactInlineInfo; 58 import org.graalvm.compiler.phases.common.inlining.info.InlineInfo; 59 import org.graalvm.compiler.phases.common.inlining.info.MultiTypeGuardInlineInfo; 60 import org.graalvm.compiler.phases.common.inlining.info.TypeGuardInlineInfo; 61 import org.graalvm.compiler.phases.common.inlining.info.elem.Inlineable; 62 import org.graalvm.compiler.phases.common.inlining.info.elem.InlineableGraph; 63 import org.graalvm.compiler.phases.common.inlining.policy.InliningPolicy; 64 import org.graalvm.compiler.phases.tiers.HighTierContext; 65 import org.graalvm.compiler.phases.util.Providers; 66 import org.graalvm.util.EconomicSet; 67 import org.graalvm.util.Equivalence; 68 69 import jdk.vm.ci.code.BailoutException; 70 import jdk.vm.ci.meta.Assumptions.AssumptionResult; 71 import jdk.vm.ci.meta.JavaTypeProfile; 72 import jdk.vm.ci.meta.ResolvedJavaMethod; 73 import jdk.vm.ci.meta.ResolvedJavaType; 74 75 /** 76 * <p> 77 * The space of inlining decisions is explored depth-first with the help of a stack realized by 78 * {@link InliningData}. At any point in time, the topmost element of that stack consists of: 79 * <ul> 80 * <li>the callsite under consideration is tracked as a {@link MethodInvocation}.</li> 81 * <li>one or more {@link CallsiteHolder}s, all of them associated to the callsite above. Why more 82 * than one? Depending on the type-profile for the receiver more than one concrete method may be 83 * feasible target.</li> 84 * </ul> 85 * </p> 86 * 87 * <p> 88 * The bottom element in the stack consists of: 89 * <ul> 90 * <li>a single {@link MethodInvocation} (the 91 * {@link org.graalvm.compiler.phases.common.inlining.walker.MethodInvocation#isRoot root} one, ie 92 * the unknown caller of the root graph)</li> 93 * <li>a single {@link CallsiteHolder} (the root one, for the method on which inlining was called) 94 * </li> 95 * </ul> 96 * </p> 97 * 98 * @see #moveForward() 99 */ 100 public class InliningData { 101 102 // Counters 103 private static final CounterKey counterInliningPerformed = DebugContext.counter("InliningPerformed"); 104 private static final CounterKey counterInliningRuns = DebugContext.counter("InliningRuns"); 105 private static final CounterKey counterInliningConsidered = DebugContext.counter("InliningConsidered"); 106 107 /** 108 * Call hierarchy from outer most call (i.e., compilation unit) to inner most callee. 109 */ 110 private final ArrayDeque<CallsiteHolder> graphQueue = new ArrayDeque<>(); 111 private final ArrayDeque<MethodInvocation> invocationQueue = new ArrayDeque<>(); 112 113 private final HighTierContext context; 114 private final int maxMethodPerInlining; 115 private final CanonicalizerPhase canonicalizer; 116 private final InliningPolicy inliningPolicy; 117 private final StructuredGraph rootGraph; 118 private final DebugContext debug; 119 120 private int maxGraphs; 121 122 public InliningData(StructuredGraph rootGraph, HighTierContext context, int maxMethodPerInlining, CanonicalizerPhase canonicalizer, InliningPolicy inliningPolicy, LinkedList<Invoke> rootInvokes) { 123 assert rootGraph != null; 124 this.context = context; 125 this.maxMethodPerInlining = maxMethodPerInlining; 126 this.canonicalizer = canonicalizer; 127 this.inliningPolicy = inliningPolicy; 128 this.maxGraphs = 1; 129 this.rootGraph = rootGraph; 130 this.debug = rootGraph.getDebug(); 131 132 invocationQueue.push(new MethodInvocation(null, 1.0, 1.0, null)); 133 graphQueue.push(new CallsiteHolderExplorable(rootGraph, 1.0, 1.0, null, rootInvokes)); 134 } 135 136 public static boolean isFreshInstantiation(ValueNode arg) { 137 return (arg instanceof AbstractNewObjectNode) || (arg instanceof AllocatedObjectNode) || (arg instanceof VirtualObjectNode); 138 } 139 140 private String checkTargetConditionsHelper(ResolvedJavaMethod method, int invokeBci) { 141 OptionValues options = rootGraph.getOptions(); 142 if (method == null) { 143 return "the method is not resolved"; 144 } else if (method.isNative() && (!Intrinsify.getValue(options) || !InliningUtil.canIntrinsify(context.getReplacements(), method, invokeBci))) { 145 return "it is a non-intrinsic native method"; 146 } else if (method.isAbstract()) { 147 return "it is an abstract method"; 148 } else if (!method.getDeclaringClass().isInitialized()) { 149 return "the method's class is not initialized"; 150 } else if (!method.canBeInlined()) { 151 return "it is marked non-inlinable"; 152 } else if (countRecursiveInlining(method) > MaximumRecursiveInlining.getValue(options)) { 153 return "it exceeds the maximum recursive inlining depth"; 154 } else { 155 if (new OptimisticOptimizations(rootGraph.getProfilingInfo(method), options).lessOptimisticThan(context.getOptimisticOptimizations())) { 156 return "the callee uses less optimistic optimizations than caller"; 157 } else { 158 return null; 159 } 160 } 161 } 162 163 private boolean checkTargetConditions(Invoke invoke, ResolvedJavaMethod method) { 164 final String failureMessage = checkTargetConditionsHelper(method, invoke.bci()); 165 if (failureMessage == null) { 166 return true; 167 } else { 168 InliningUtil.logNotInlined(invoke, inliningDepth(), method, failureMessage); 169 return false; 170 } 171 } 172 173 /** 174 * Determines if inlining is possible at the given invoke node. 175 * 176 * @param invoke the invoke that should be inlined 177 * @return an instance of InlineInfo, or null if no inlining is possible at the given invoke 178 */ 179 private InlineInfo getInlineInfo(Invoke invoke) { 180 final String failureMessage = InliningUtil.checkInvokeConditions(invoke); 181 if (failureMessage != null) { 182 InliningUtil.logNotInlinedMethod(invoke, failureMessage); 183 return null; 184 } 185 MethodCallTargetNode callTarget = (MethodCallTargetNode) invoke.callTarget(); 186 ResolvedJavaMethod targetMethod = callTarget.targetMethod(); 187 188 if (callTarget.invokeKind() == CallTargetNode.InvokeKind.Special || targetMethod.canBeStaticallyBound()) { 189 return getExactInlineInfo(invoke, targetMethod); 190 } 191 192 assert callTarget.invokeKind().isIndirect(); 193 194 ResolvedJavaType holder = targetMethod.getDeclaringClass(); 195 if (!(callTarget.receiver().stamp() instanceof ObjectStamp)) { 196 return null; 197 } 198 ObjectStamp receiverStamp = (ObjectStamp) callTarget.receiver().stamp(); 199 if (receiverStamp.alwaysNull()) { 200 // Don't inline if receiver is known to be null 201 return null; 202 } 203 ResolvedJavaType contextType = invoke.getContextType(); 204 if (receiverStamp.type() != null) { 205 // the invoke target might be more specific than the holder (happens after inlining: 206 // parameters lose their declared type...) 207 ResolvedJavaType receiverType = receiverStamp.type(); 208 if (receiverType != null && holder.isAssignableFrom(receiverType)) { 209 holder = receiverType; 210 if (receiverStamp.isExactType()) { 211 assert targetMethod.getDeclaringClass().isAssignableFrom(holder) : holder + " subtype of " + targetMethod.getDeclaringClass() + " for " + targetMethod; 212 ResolvedJavaMethod resolvedMethod = holder.resolveConcreteMethod(targetMethod, contextType); 213 if (resolvedMethod != null) { 214 return getExactInlineInfo(invoke, resolvedMethod); 215 } 216 } 217 } 218 } 219 220 if (holder.isArray()) { 221 // arrays can be treated as Objects 222 ResolvedJavaMethod resolvedMethod = holder.resolveConcreteMethod(targetMethod, contextType); 223 if (resolvedMethod != null) { 224 return getExactInlineInfo(invoke, resolvedMethod); 225 } 226 } 227 228 AssumptionResult<ResolvedJavaType> leafConcreteSubtype = holder.findLeafConcreteSubtype(); 229 if (leafConcreteSubtype != null) { 230 ResolvedJavaMethod resolvedMethod = leafConcreteSubtype.getResult().resolveConcreteMethod(targetMethod, contextType); 231 if (resolvedMethod != null) { 232 if (leafConcreteSubtype.canRecordTo(callTarget.graph().getAssumptions())) { 233 return getAssumptionInlineInfo(invoke, resolvedMethod, leafConcreteSubtype); 234 } else { 235 return getTypeCheckedAssumptionInfo(invoke, resolvedMethod, leafConcreteSubtype.getResult()); 236 } 237 } 238 } 239 240 AssumptionResult<ResolvedJavaMethod> concrete = holder.findUniqueConcreteMethod(targetMethod); 241 if (concrete != null && concrete.canRecordTo(callTarget.graph().getAssumptions())) { 242 return getAssumptionInlineInfo(invoke, concrete.getResult(), concrete); 243 } 244 245 // type check based inlining 246 return getTypeCheckedInlineInfo(invoke, targetMethod); 247 } 248 249 private InlineInfo getTypeCheckedAssumptionInfo(Invoke invoke, ResolvedJavaMethod method, ResolvedJavaType type) { 250 if (!checkTargetConditions(invoke, method)) { 251 return null; 252 } 253 return new TypeGuardInlineInfo(invoke, method, type); 254 } 255 256 private InlineInfo getTypeCheckedInlineInfo(Invoke invoke, ResolvedJavaMethod targetMethod) { 257 JavaTypeProfile typeProfile = ((MethodCallTargetNode) invoke.callTarget()).getProfile(); 258 if (typeProfile == null) { 259 InliningUtil.logNotInlined(invoke, inliningDepth(), targetMethod, "no type profile exists"); 260 return null; 261 } 262 263 JavaTypeProfile.ProfiledType[] ptypes = typeProfile.getTypes(); 264 if (ptypes == null || ptypes.length <= 0) { 265 InliningUtil.logNotInlined(invoke, inliningDepth(), targetMethod, "no types in profile"); 266 return null; 267 } 268 ResolvedJavaType contextType = invoke.getContextType(); 269 double notRecordedTypeProbability = typeProfile.getNotRecordedProbability(); 270 final OptimisticOptimizations optimisticOpts = context.getOptimisticOptimizations(); 271 OptionValues options = invoke.asNode().getOptions(); 272 if (ptypes.length == 1 && notRecordedTypeProbability == 0) { 273 if (!optimisticOpts.inlineMonomorphicCalls(options)) { 274 InliningUtil.logNotInlined(invoke, inliningDepth(), targetMethod, "inlining monomorphic calls is disabled"); 275 return null; 276 } 277 278 ResolvedJavaType type = ptypes[0].getType(); 279 assert type.isArray() || type.isConcrete(); 280 ResolvedJavaMethod concrete = type.resolveConcreteMethod(targetMethod, contextType); 281 if (!checkTargetConditions(invoke, concrete)) { 282 return null; 283 } 284 return new TypeGuardInlineInfo(invoke, concrete, type); 285 } else { 286 invoke.setPolymorphic(true); 287 288 if (!optimisticOpts.inlinePolymorphicCalls(options) && notRecordedTypeProbability == 0) { 289 InliningUtil.logNotInlinedInvoke(invoke, inliningDepth(), targetMethod, "inlining polymorphic calls is disabled (%d types)", ptypes.length); 290 return null; 291 } 292 if (!optimisticOpts.inlineMegamorphicCalls(options) && notRecordedTypeProbability > 0) { 293 // due to filtering impossible types, notRecordedTypeProbability can be > 0 although 294 // the number of types is lower than what can be recorded in a type profile 295 InliningUtil.logNotInlinedInvoke(invoke, inliningDepth(), targetMethod, "inlining megamorphic calls is disabled (%d types, %f %% not recorded types)", ptypes.length, 296 notRecordedTypeProbability * 100); 297 return null; 298 } 299 300 // Find unique methods and their probabilities. 301 ArrayList<ResolvedJavaMethod> concreteMethods = new ArrayList<>(); 302 ArrayList<Double> concreteMethodsProbabilities = new ArrayList<>(); 303 for (int i = 0; i < ptypes.length; i++) { 304 ResolvedJavaMethod concrete = ptypes[i].getType().resolveConcreteMethod(targetMethod, contextType); 305 if (concrete == null) { 306 InliningUtil.logNotInlined(invoke, inliningDepth(), targetMethod, "could not resolve method"); 307 return null; 308 } 309 int index = concreteMethods.indexOf(concrete); 310 double curProbability = ptypes[i].getProbability(); 311 if (index < 0) { 312 index = concreteMethods.size(); 313 concreteMethods.add(concrete); 314 concreteMethodsProbabilities.add(curProbability); 315 } else { 316 concreteMethodsProbabilities.set(index, concreteMethodsProbabilities.get(index) + curProbability); 317 } 318 } 319 320 // Clear methods that fall below the threshold. 321 if (notRecordedTypeProbability > 0) { 322 ArrayList<ResolvedJavaMethod> newConcreteMethods = new ArrayList<>(); 323 ArrayList<Double> newConcreteMethodsProbabilities = new ArrayList<>(); 324 for (int i = 0; i < concreteMethods.size(); ++i) { 325 if (concreteMethodsProbabilities.get(i) >= MegamorphicInliningMinMethodProbability.getValue(options)) { 326 newConcreteMethods.add(concreteMethods.get(i)); 327 newConcreteMethodsProbabilities.add(concreteMethodsProbabilities.get(i)); 328 } 329 } 330 331 if (newConcreteMethods.isEmpty()) { 332 // No method left that is worth inlining. 333 InliningUtil.logNotInlinedInvoke(invoke, inliningDepth(), targetMethod, "no methods remaining after filtering less frequent methods (%d methods previously)", 334 concreteMethods.size()); 335 return null; 336 } 337 338 concreteMethods = newConcreteMethods; 339 concreteMethodsProbabilities = newConcreteMethodsProbabilities; 340 } 341 342 if (concreteMethods.size() > maxMethodPerInlining) { 343 InliningUtil.logNotInlinedInvoke(invoke, inliningDepth(), targetMethod, "polymorphic call with more than %d target methods", maxMethodPerInlining); 344 return null; 345 } 346 347 // Clean out types whose methods are no longer available. 348 ArrayList<JavaTypeProfile.ProfiledType> usedTypes = new ArrayList<>(); 349 ArrayList<Integer> typesToConcretes = new ArrayList<>(); 350 for (JavaTypeProfile.ProfiledType type : ptypes) { 351 ResolvedJavaMethod concrete = type.getType().resolveConcreteMethod(targetMethod, contextType); 352 int index = concreteMethods.indexOf(concrete); 353 if (index == -1) { 354 notRecordedTypeProbability += type.getProbability(); 355 } else { 356 assert type.getType().isArray() || !type.getType().isAbstract() : type + " " + concrete; 357 usedTypes.add(type); 358 typesToConcretes.add(index); 359 } 360 } 361 362 if (usedTypes.isEmpty()) { 363 // No type left that is worth checking for. 364 InliningUtil.logNotInlinedInvoke(invoke, inliningDepth(), targetMethod, "no types remaining after filtering less frequent types (%d types previously)", ptypes.length); 365 return null; 366 } 367 368 for (ResolvedJavaMethod concrete : concreteMethods) { 369 if (!checkTargetConditions(invoke, concrete)) { 370 InliningUtil.logNotInlined(invoke, inliningDepth(), targetMethod, "it is a polymorphic method call and at least one invoked method cannot be inlined"); 371 return null; 372 } 373 } 374 return new MultiTypeGuardInlineInfo(invoke, concreteMethods, usedTypes, typesToConcretes, notRecordedTypeProbability); 375 } 376 } 377 378 private InlineInfo getAssumptionInlineInfo(Invoke invoke, ResolvedJavaMethod concrete, AssumptionResult<?> takenAssumption) { 379 assert concrete.isConcrete(); 380 if (checkTargetConditions(invoke, concrete)) { 381 return new AssumptionInlineInfo(invoke, concrete, takenAssumption); 382 } 383 return null; 384 } 385 386 private InlineInfo getExactInlineInfo(Invoke invoke, ResolvedJavaMethod targetMethod) { 387 assert targetMethod.isConcrete(); 388 if (checkTargetConditions(invoke, targetMethod)) { 389 return new ExactInlineInfo(invoke, targetMethod); 390 } 391 return null; 392 } 393 394 @SuppressWarnings("try") 395 private void doInline(CallsiteHolderExplorable callerCallsiteHolder, MethodInvocation calleeInvocation) { 396 StructuredGraph callerGraph = callerCallsiteHolder.graph(); 397 InlineInfo calleeInfo = calleeInvocation.callee(); 398 try { 399 try (DebugContext.Scope scope = debug.scope("doInline", callerGraph)) { 400 EconomicSet<Node> canonicalizedNodes = EconomicSet.create(Equivalence.IDENTITY); 401 canonicalizedNodes.addAll(calleeInfo.invoke().asNode().usages()); 402 EconomicSet<Node> parameterUsages = calleeInfo.inline(new Providers(context)); 403 canonicalizedNodes.addAll(parameterUsages); 404 counterInliningRuns.increment(debug); 405 debug.dump(DebugContext.DETAILED_LEVEL, callerGraph, "after %s", calleeInfo); 406 407 Graph.Mark markBeforeCanonicalization = callerGraph.getMark(); 408 409 canonicalizer.applyIncremental(callerGraph, context, canonicalizedNodes); 410 411 // process invokes that are possibly created during canonicalization 412 for (Node newNode : callerGraph.getNewNodes(markBeforeCanonicalization)) { 413 if (newNode instanceof Invoke) { 414 callerCallsiteHolder.pushInvoke((Invoke) newNode); 415 } 416 } 417 418 callerCallsiteHolder.computeProbabilities(); 419 420 counterInliningPerformed.increment(debug); 421 } 422 } catch (BailoutException bailout) { 423 throw bailout; 424 } catch (AssertionError | RuntimeException e) { 425 throw new GraalError(e).addContext(calleeInfo.toString()); 426 } catch (GraalError e) { 427 throw e.addContext(calleeInfo.toString()); 428 } catch (Throwable e) { 429 throw debug.handle(e); 430 } 431 } 432 433 /** 434 * 435 * This method attempts: 436 * <ol> 437 * <li>to inline at the callsite given by <code>calleeInvocation</code>, where that callsite 438 * belongs to the {@link CallsiteHolderExplorable} at the top of the {@link #graphQueue} 439 * maintained in this class.</li> 440 * <li>otherwise, to devirtualize the callsite in question.</li> 441 * </ol> 442 * 443 * @return true iff inlining was actually performed 444 */ 445 private boolean tryToInline(MethodInvocation calleeInvocation, int inliningDepth) { 446 CallsiteHolderExplorable callerCallsiteHolder = (CallsiteHolderExplorable) currentGraph(); 447 InlineInfo calleeInfo = calleeInvocation.callee(); 448 assert callerCallsiteHolder.containsInvoke(calleeInfo.invoke()); 449 counterInliningConsidered.increment(debug); 450 451 if (inliningPolicy.isWorthInlining(context.getReplacements(), calleeInvocation, inliningDepth, true)) { 452 doInline(callerCallsiteHolder, calleeInvocation); 453 return true; 454 } 455 456 if (context.getOptimisticOptimizations().devirtualizeInvokes(calleeInfo.graph().getOptions())) { 457 calleeInfo.tryToDevirtualizeInvoke(new Providers(context)); 458 } 459 460 return false; 461 } 462 463 /** 464 * This method picks one of the callsites belonging to the current 465 * {@link CallsiteHolderExplorable}. Provided the callsite qualifies to be analyzed for 466 * inlining, this method prepares a new stack top in {@link InliningData} for such callsite, 467 * which comprises: 468 * <ul> 469 * <li>preparing a summary of feasible targets, ie preparing an {@link InlineInfo}</li> 470 * <li>based on it, preparing the stack top proper which consists of:</li> 471 * <ul> 472 * <li>one {@link MethodInvocation}</li> 473 * <li>a {@link CallsiteHolder} for each feasible target</li> 474 * </ul> 475 * </ul> 476 * 477 * <p> 478 * The thus prepared "stack top" is needed by {@link #moveForward()} to explore the space of 479 * inlining decisions (each decision one of: backtracking, delving, inlining). 480 * </p> 481 * 482 * <p> 483 * The {@link InlineInfo} used to get things rolling is kept around in the 484 * {@link MethodInvocation}, it will be needed in case of inlining, see 485 * {@link InlineInfo#inline(Providers)} 486 * </p> 487 */ 488 private void processNextInvoke() { 489 CallsiteHolderExplorable callsiteHolder = (CallsiteHolderExplorable) currentGraph(); 490 Invoke invoke = callsiteHolder.popInvoke(); 491 InlineInfo info = getInlineInfo(invoke); 492 493 if (info != null) { 494 info.populateInlinableElements(context, currentGraph().graph(), canonicalizer, rootGraph.getOptions()); 495 double invokeProbability = callsiteHolder.invokeProbability(invoke); 496 double invokeRelevance = callsiteHolder.invokeRelevance(invoke); 497 MethodInvocation methodInvocation = new MethodInvocation(info, invokeProbability, invokeRelevance, freshlyInstantiatedArguments(invoke, callsiteHolder.getFixedParams())); 498 pushInvocationAndGraphs(methodInvocation); 499 } 500 } 501 502 /** 503 * Gets the freshly instantiated arguments. 504 * <p> 505 * A freshly instantiated argument is either: 506 * <uL> 507 * <li>an {@link InliningData#isFreshInstantiation(org.graalvm.compiler.nodes.ValueNode)}</li> 508 * <li>a fixed-param, ie a {@link ParameterNode} receiving a freshly instantiated argument</li> 509 * </uL> 510 * </p> 511 * 512 * @return the positions of freshly instantiated arguments in the argument list of the 513 * <code>invoke</code>, or null if no such positions exist. 514 */ 515 public static BitSet freshlyInstantiatedArguments(Invoke invoke, EconomicSet<ParameterNode> fixedParams) { 516 assert fixedParams != null; 517 assert paramsAndInvokeAreInSameGraph(invoke, fixedParams); 518 BitSet result = null; 519 int argIdx = 0; 520 for (ValueNode arg : invoke.callTarget().arguments()) { 521 assert arg != null; 522 if (isFreshInstantiation(arg) || (arg instanceof ParameterNode && fixedParams.contains((ParameterNode) arg))) { 523 if (result == null) { 524 result = new BitSet(); 525 } 526 result.set(argIdx); 527 } 528 argIdx++; 529 } 530 return result; 531 } 532 533 private static boolean paramsAndInvokeAreInSameGraph(Invoke invoke, EconomicSet<ParameterNode> fixedParams) { 534 if (fixedParams.isEmpty()) { 535 return true; 536 } 537 for (ParameterNode p : fixedParams) { 538 if (p.graph() != invoke.asNode().graph()) { 539 return false; 540 } 541 } 542 return true; 543 } 544 545 public int graphCount() { 546 return graphQueue.size(); 547 } 548 549 public boolean hasUnprocessedGraphs() { 550 return !graphQueue.isEmpty(); 551 } 552 553 private CallsiteHolder currentGraph() { 554 return graphQueue.peek(); 555 } 556 557 private void popGraph() { 558 graphQueue.pop(); 559 assert graphQueue.size() <= maxGraphs; 560 } 561 562 private void popGraphs(int count) { 563 assert count >= 0; 564 for (int i = 0; i < count; i++) { 565 graphQueue.pop(); 566 } 567 } 568 569 private static final Object[] NO_CONTEXT = {}; 570 571 /** 572 * Gets the call hierarchy of this inlining from outer most call to inner most callee. 573 */ 574 private Object[] inliningContext() { 575 if (!debug.isDumpEnabled(DebugContext.INFO_LEVEL)) { 576 return NO_CONTEXT; 577 } 578 Object[] result = new Object[graphQueue.size()]; 579 int i = 0; 580 for (CallsiteHolder g : graphQueue) { 581 result[i++] = g.method(); 582 } 583 return result; 584 } 585 586 private MethodInvocation currentInvocation() { 587 return invocationQueue.peekFirst(); 588 } 589 590 private void pushInvocationAndGraphs(MethodInvocation methodInvocation) { 591 invocationQueue.addFirst(methodInvocation); 592 InlineInfo info = methodInvocation.callee(); 593 maxGraphs += info.numberOfMethods(); 594 assert graphQueue.size() <= maxGraphs; 595 for (int i = 0; i < info.numberOfMethods(); i++) { 596 CallsiteHolder ch = methodInvocation.buildCallsiteHolderForElement(i); 597 assert !contains(ch.graph()); 598 graphQueue.push(ch); 599 assert graphQueue.size() <= maxGraphs; 600 } 601 } 602 603 private void popInvocation() { 604 maxGraphs -= invocationQueue.peekFirst().callee().numberOfMethods(); 605 assert graphQueue.size() <= maxGraphs; 606 invocationQueue.removeFirst(); 607 } 608 609 public int countRecursiveInlining(ResolvedJavaMethod method) { 610 int count = 0; 611 for (CallsiteHolder callsiteHolder : graphQueue) { 612 if (method.equals(callsiteHolder.method())) { 613 count++; 614 } 615 } 616 return count; 617 } 618 619 public int inliningDepth() { 620 assert invocationQueue.size() > 0; 621 return invocationQueue.size() - 1; 622 } 623 624 @Override 625 public String toString() { 626 StringBuilder result = new StringBuilder("Invocations: "); 627 628 for (MethodInvocation invocation : invocationQueue) { 629 if (invocation.callee() != null) { 630 result.append(invocation.callee().numberOfMethods()); 631 result.append("x "); 632 result.append(invocation.callee().invoke()); 633 result.append("; "); 634 } 635 } 636 637 result.append("\nGraphs: "); 638 for (CallsiteHolder graph : graphQueue) { 639 result.append(graph.graph()); 640 result.append("; "); 641 } 642 643 return result.toString(); 644 } 645 646 /** 647 * Gets a stack trace representing the current inlining stack represented by this object. 648 */ 649 public Collection<StackTraceElement> getInvocationStackTrace() { 650 List<StackTraceElement> result = new ArrayList<>(); 651 for (CallsiteHolder graph : graphQueue) { 652 result.add(graph.method().asStackTraceElement(0)); 653 } 654 655 return result; 656 } 657 658 private boolean contains(StructuredGraph graph) { 659 assert graph != null; 660 for (CallsiteHolder info : graphQueue) { 661 if (info.graph() == graph) { 662 return true; 663 } 664 } 665 return false; 666 } 667 668 /** 669 * <p> 670 * The stack realized by {@link InliningData} grows and shrinks as choices are made among the 671 * alternatives below: 672 * <ol> 673 * <li>not worth inlining: pop stack top, which comprises: 674 * <ul> 675 * <li>pop any remaining graphs not yet delved into</li> 676 * <li>pop the current invocation</li> 677 * </ul> 678 * </li> 679 * <li>{@link #processNextInvoke() delve} into one of the callsites hosted in the current graph, 680 * such callsite is explored next by {@link #moveForward()}</li> 681 * <li>{@link #tryToInline(MethodInvocation, int) try to inline}: move past the current graph 682 * (remove it from the topmost element). 683 * <ul> 684 * <li>If that was the last one then {@link #tryToInline(MethodInvocation, int) try to inline} 685 * the callsite under consideration (ie, the "current invocation").</li> 686 * <li>Whether inlining occurs or not, that callsite is removed from the top of 687 * {@link InliningData} .</li> 688 * </ul> 689 * </li> 690 * </ol> 691 * </p> 692 * 693 * <p> 694 * Some facts about the alternatives above: 695 * <ul> 696 * <li>the first step amounts to backtracking, the 2nd one to depth-search, and the 3rd one also 697 * involves backtracking (however possibly after inlining).</li> 698 * <li>the choice of abandon-and-backtrack or delve-into depends on 699 * {@link InliningPolicy#isWorthInlining} and {@link InliningPolicy#continueInlining}.</li> 700 * <li>the 3rd choice is picked whenever none of the previous choices are made</li> 701 * </ul> 702 * </p> 703 * 704 * @return true iff inlining was actually performed 705 */ 706 @SuppressWarnings("try") 707 public boolean moveForward() { 708 709 final MethodInvocation currentInvocation = currentInvocation(); 710 711 final boolean backtrack = (!currentInvocation.isRoot() && !inliningPolicy.isWorthInlining(context.getReplacements(), currentInvocation, inliningDepth(), false)); 712 if (backtrack) { 713 int remainingGraphs = currentInvocation.totalGraphs() - currentInvocation.processedGraphs(); 714 assert remainingGraphs > 0; 715 popGraphs(remainingGraphs); 716 popInvocation(); 717 return false; 718 } 719 720 final boolean delve = currentGraph().hasRemainingInvokes() && inliningPolicy.continueInlining(currentGraph().graph()); 721 if (delve) { 722 processNextInvoke(); 723 return false; 724 } 725 726 popGraph(); 727 if (currentInvocation.isRoot()) { 728 return false; 729 } 730 731 // try to inline 732 assert currentInvocation.callee().invoke().asNode().isAlive(); 733 currentInvocation.incrementProcessedGraphs(); 734 if (currentInvocation.processedGraphs() == currentInvocation.totalGraphs()) { 735 /* 736 * "all of currentInvocation's graphs processed" amounts to 737 * "all concrete methods that come into question already had the callees they contain analyzed for inlining" 738 */ 739 popInvocation(); 740 try (DebugContext.Scope s = debug.scope("Inlining", inliningContext())) { 741 if (tryToInline(currentInvocation, inliningDepth() + 1)) { 742 // Report real progress only if we inline into the root graph 743 return currentGraph().graph() == rootGraph; 744 } 745 return false; 746 } catch (Throwable e) { 747 throw debug.handle(e); 748 } 749 } 750 751 return false; 752 } 753 754 /** 755 * Checks an invariant that {@link #moveForward()} must maintain: "the top invocation records 756 * how many concrete target methods (for it) remain on the {@link #graphQueue}; those targets 757 * 'belong' to the current invocation in question. 758 */ 759 private boolean topGraphsForTopInvocation() { 760 if (invocationQueue.isEmpty()) { 761 assert graphQueue.isEmpty(); 762 return true; 763 } 764 if (currentInvocation().isRoot()) { 765 if (!graphQueue.isEmpty()) { 766 assert graphQueue.size() == 1; 767 } 768 return true; 769 } 770 final int remainingGraphs = currentInvocation().totalGraphs() - currentInvocation().processedGraphs(); 771 final Iterator<CallsiteHolder> iter = graphQueue.iterator(); 772 for (int i = (remainingGraphs - 1); i >= 0; i--) { 773 if (!iter.hasNext()) { 774 assert false; 775 return false; 776 } 777 CallsiteHolder queuedTargetCH = iter.next(); 778 Inlineable targetIE = currentInvocation().callee().inlineableElementAt(i); 779 InlineableGraph targetIG = (InlineableGraph) targetIE; 780 assert queuedTargetCH.method().equals(targetIG.getGraph().method()); 781 } 782 return true; 783 } 784 785 /** 786 * This method checks invariants for this class. Named after shorthand for "internal 787 * representation is ok". 788 */ 789 public boolean repOK() { 790 assert topGraphsForTopInvocation(); 791 return true; 792 } 793 }