Mercurial > hg > truffle
view graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/InliningUtil.java @ 6683:45872267325e
Fix Inlining : null check guard should use reason NullCheckException
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Wed, 07 Nov 2012 17:48:02 +0100 |
parents | a52320a6bbda |
children | 41938af2b3d8 9f9068a65a83 0d7dfa5b79e8 |
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/* * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.phases.common; import java.lang.reflect.*; import java.util.*; import java.util.concurrent.*; import com.oracle.graal.api.code.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.api.meta.ResolvedJavaType.Representation; import com.oracle.graal.api.meta.JavaTypeProfile.ProfiledType; import com.oracle.graal.debug.*; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.nodes.java.*; import com.oracle.graal.nodes.java.MethodCallTargetNode.InvokeKind; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; import com.oracle.graal.nodes.util.*; import com.oracle.graal.phases.*; public class InliningUtil { private static final DebugMetric metricInliningTailDuplication = Debug.metric("InliningTailDuplication"); public interface InliningCallback { StructuredGraph buildGraph(ResolvedJavaMethod method); double inliningWeight(ResolvedJavaMethod caller, ResolvedJavaMethod method, Invoke invoke); void recordMethodContentsAssumption(ResolvedJavaMethod method); void recordConcreteMethodAssumption(ResolvedJavaMethod method, ResolvedJavaType context, ResolvedJavaMethod impl); } public static String methodName(ResolvedJavaMethod method, Invoke invoke) { if (!Debug.isLogEnabled()) { return null; } else if (invoke != null && invoke.stateAfter() != null) { return methodName(invoke.stateAfter(), invoke.bci()) + ": " + MetaUtil.format("%H.%n(%p):%r", method) + " (" + method.getCodeSize() + " bytes)"; } else { return MetaUtil.format("%H.%n(%p):%r", method) + " (" + method.getCodeSize() + " bytes)"; } } public static String methodName(InlineInfo info) { if (!Debug.isLogEnabled()) { return null; } else if (info.invoke != null && info.invoke.stateAfter() != null) { return methodName(info.invoke.stateAfter(), info.invoke.bci()) + ": " + info.toString(); } else { return info.toString(); } } private static String methodName(FrameState frameState, int bci) { StringBuilder sb = new StringBuilder(); if (frameState.outerFrameState() != null) { sb.append(methodName(frameState.outerFrameState(), frameState.outerFrameState().bci)); sb.append("->"); } sb.append(MetaUtil.format("%h.%n", frameState.method())); sb.append("@").append(bci); return sb.toString(); } /** * Represents an opportunity for inlining at the given invoke, with the given weight and level. * The weight is the amortized weight of the additional code - so smaller is better. * The level is the number of nested inlinings that lead to this invoke. */ public abstract static class InlineInfo implements Comparable<InlineInfo> { public final Invoke invoke; public final double weight; public final int level; public InlineInfo(Invoke invoke, double weight, int level) { this.invoke = invoke; this.weight = weight; this.level = level; } public abstract int compiledCodeSize(); @Override public int compareTo(InlineInfo o) { return (weight < o.weight) ? -1 : (weight > o.weight) ? 1 : 0; } protected static StructuredGraph getGraph(final ResolvedJavaMethod concrete, final InliningCallback callback) { return Debug.scope("GetInliningGraph", concrete, new Callable<StructuredGraph>() { @Override public StructuredGraph call() throws Exception { return callback.buildGraph(concrete); } }); } public abstract boolean canDeopt(); /** * Performs the inlining described by this object and returns the node that represents the return value of the * inlined method (or null for void methods and methods that have no non-exceptional exit). * * @param graph * @param runtime * @param callback */ public abstract void inline(StructuredGraph graph, GraalCodeCacheProvider runtime, InliningCallback callback); } /** * Represents an inlining opportunity where the compiler can statically determine a monomorphic target method and * therefore is able to determine the called method exactly. */ private static class ExactInlineInfo extends InlineInfo { public final ResolvedJavaMethod concrete; public ExactInlineInfo(Invoke invoke, double weight, int level, ResolvedJavaMethod concrete) { super(invoke, weight, level); this.concrete = concrete; } @Override public void inline(StructuredGraph compilerGraph, GraalCodeCacheProvider runtime, final InliningCallback callback) { StructuredGraph graph = getGraph(concrete, callback); assert !IntrinsificationPhase.canIntrinsify(invoke, concrete, runtime); callback.recordMethodContentsAssumption(concrete); InliningUtil.inline(invoke, graph, true); } @Override public int compiledCodeSize() { return concrete.getCompiledCodeSize(); } @Override public String toString() { return "exact " + MetaUtil.format("%H.%n(%p):%r", concrete); } @Override public boolean canDeopt() { return false; } } /** * Represents an inlining opportunity for which profiling information suggests a monomorphic receiver, but for which * the receiver type cannot be proven. A type check guard will be generated if this inlining is performed. */ private static class TypeGuardInlineInfo extends InlineInfo { public final ResolvedJavaMethod concrete; public final ResolvedJavaType type; public TypeGuardInlineInfo(Invoke invoke, double weight, int level, ResolvedJavaMethod concrete, ResolvedJavaType type) { super(invoke, weight, level); this.concrete = concrete; this.type = type; } @Override public int compiledCodeSize() { return concrete.getCompiledCodeSize(); } @Override public void inline(StructuredGraph graph, GraalCodeCacheProvider runtime, InliningCallback callback) { // receiver null check must be before the type check InliningUtil.receiverNullCheck(invoke); ValueNode receiver = invoke.methodCallTarget().receiver(); LoadHubNode receiverHub = graph.add(new LoadHubNode(receiver)); ConstantNode typeHub = ConstantNode.forConstant(type.getEncoding(Representation.ObjectHub), runtime, graph); ObjectEqualsNode typeCheck = graph.unique(new ObjectEqualsNode(receiverHub, typeHub)); FixedGuardNode guard = graph.add(new FixedGuardNode(typeCheck, DeoptimizationReason.TypeCheckedInliningViolated, DeoptimizationAction.InvalidateReprofile, invoke.leafGraphId())); ValueAnchorNode anchor = graph.add(new ValueAnchorNode()); assert invoke.predecessor() != null; ValueNode anchoredReceiver = createAnchoredReceiver(graph, anchor, type, receiver, true); invoke.callTarget().replaceFirstInput(receiver, anchoredReceiver); graph.addBeforeFixed(invoke.node(), receiverHub); graph.addBeforeFixed(invoke.node(), guard); graph.addBeforeFixed(invoke.node(), anchor); StructuredGraph calleeGraph = getGraph(concrete, callback); assert !IntrinsificationPhase.canIntrinsify(invoke, concrete, runtime); callback.recordMethodContentsAssumption(concrete); InliningUtil.inline(invoke, calleeGraph, false); } @Override public String toString() { return "type-checked " + MetaUtil.format("%H.%n(%p):%r", concrete); } @Override public boolean canDeopt() { return true; } } /** * Polymorphic inlining of m methods with n type checks (n >= m) in case that the profiling information suggests a reasonable * amounts of different receiver types and different methods. If an unknown type is encountered a deoptimization is triggered. */ private static class MultiTypeGuardInlineInfo extends InlineInfo { public final List<ResolvedJavaMethod> concretes; public final ProfiledType[] ptypes; public final int[] typesToConcretes; public final double notRecordedTypeProbability; public MultiTypeGuardInlineInfo(Invoke invoke, double weight, int level, List<ResolvedJavaMethod> concretes, ProfiledType[] ptypes, int[] typesToConcretes, double notRecordedTypeProbability) { super(invoke, weight, level); assert concretes.size() > 0 && concretes.size() <= ptypes.length : "must have at least one method but no more than types methods"; assert ptypes.length == typesToConcretes.length : "array lengths must match"; this.concretes = concretes; this.ptypes = ptypes; this.typesToConcretes = typesToConcretes; this.notRecordedTypeProbability = notRecordedTypeProbability; } @Override public int compiledCodeSize() { int result = 0; for (ResolvedJavaMethod m: concretes) { result += m.getCompiledCodeSize(); } return result; } @Override public void inline(StructuredGraph graph, GraalCodeCacheProvider runtime, InliningCallback callback) { int numberOfMethods = concretes.size(); boolean hasReturnValue = invoke.node().kind() != Kind.Void; // receiver null check must be the first node InliningUtil.receiverNullCheck(invoke); if (numberOfMethods > 1 || shouldFallbackToInvoke()) { inlineMultipleMethods(graph, runtime, callback, numberOfMethods, hasReturnValue); } else { inlineSingleMethod(graph, runtime, callback); } } private boolean shouldFallbackToInvoke() { return notRecordedTypeProbability > 0; } private void inlineMultipleMethods(StructuredGraph graph, GraalCodeCacheProvider runtime, InliningCallback callback, int numberOfMethods, boolean hasReturnValue) { FixedNode continuation = invoke.next(); ValueNode originalReceiver = invoke.methodCallTarget().receiver(); // setup merge and phi nodes for results and exceptions MergeNode returnMerge = graph.add(new MergeNode()); returnMerge.setProbability(invoke.probability()); returnMerge.setStateAfter(invoke.stateAfter().duplicate(invoke.stateAfter().bci)); PhiNode returnValuePhi = null; if (hasReturnValue) { returnValuePhi = graph.unique(new PhiNode(invoke.node().kind(), returnMerge)); } MergeNode exceptionMerge = null; PhiNode exceptionObjectPhi = null; if (invoke instanceof InvokeWithExceptionNode) { InvokeWithExceptionNode invokeWithException = (InvokeWithExceptionNode) invoke; DispatchBeginNode exceptionEdge = invokeWithException.exceptionEdge(); ExceptionObjectNode exceptionObject = (ExceptionObjectNode) exceptionEdge.next(); exceptionMerge = graph.add(new MergeNode()); exceptionMerge.setProbability(exceptionEdge.probability()); FixedNode exceptionSux = exceptionObject.next(); graph.addBeforeFixed(exceptionSux, exceptionMerge); exceptionObjectPhi = graph.unique(new PhiNode(Kind.Object, exceptionMerge)); exceptionMerge.setStateAfter(exceptionEdge.stateAfter().duplicateModified(invoke.stateAfter().bci, true, Kind.Void, exceptionObjectPhi)); } // create one separate block for each invoked method BeginNode[] calleeEntryNodes = new BeginNode[numberOfMethods]; for (int i = 0; i < numberOfMethods; i++) { int predecessors = 0; double probability = 0; for (int j = 0; j < typesToConcretes.length; j++) { if (typesToConcretes[j] == i) { predecessors++; probability += ptypes[j].getProbability(); } } calleeEntryNodes[i] = createInvocationBlock(graph, invoke, returnMerge, returnValuePhi, exceptionMerge, exceptionObjectPhi, predecessors, invoke.probability() * probability, true); } // create the successor for an unknown type FixedNode unknownTypeNode; if (shouldFallbackToInvoke()) { unknownTypeNode = createInvocationBlock(graph, invoke, returnMerge, returnValuePhi, exceptionMerge, exceptionObjectPhi, 1, notRecordedTypeProbability, false); } else { unknownTypeNode = graph.add(new DeoptimizeNode(DeoptimizationAction.InvalidateReprofile, DeoptimizationReason.TypeCheckedInliningViolated, invoke.leafGraphId())); } // replace the invoke exception edge if (invoke instanceof InvokeWithExceptionNode) { InvokeWithExceptionNode invokeWithExceptionNode = (InvokeWithExceptionNode) invoke; BeginNode exceptionEdge = invokeWithExceptionNode.exceptionEdge(); ExceptionObjectNode exceptionObject = (ExceptionObjectNode) exceptionEdge.next(); exceptionObject.replaceAtUsages(exceptionObjectPhi); exceptionObject.setNext(null); GraphUtil.killCFG(invokeWithExceptionNode.exceptionEdge()); } // replace the invoke with a switch on the type of the actual receiver LoadHubNode receiverHub = graph.add(new LoadHubNode(invoke.methodCallTarget().receiver())); graph.addBeforeFixed(invoke.node(), receiverHub); FixedNode dispatchOnType = createDispatchOnType(graph, receiverHub, calleeEntryNodes, unknownTypeNode); assert invoke.next() == continuation; invoke.setNext(null); returnMerge.setNext(continuation); invoke.node().replaceAtUsages(returnValuePhi); invoke.node().replaceAndDelete(dispatchOnType); ArrayList<PiNode> replacements = new ArrayList<>(); // do the actual inlining for every invoke for (int i = 0; i < calleeEntryNodes.length; i++) { BeginNode node = calleeEntryNodes[i]; Invoke invokeForInlining = (Invoke) node.next(); ResolvedJavaType commonType = getLeastCommonType(i); ValueNode receiver = invokeForInlining.methodCallTarget().receiver(); boolean exact = getTypeCount(i) == 1; PiNode anchoredReceiver = createAnchoredReceiver(graph, node, commonType, receiver, exact); invokeForInlining.callTarget().replaceFirstInput(receiver, anchoredReceiver); ResolvedJavaMethod concrete = concretes.get(i); StructuredGraph calleeGraph = getGraph(concrete, callback); callback.recordMethodContentsAssumption(concrete); assert !IntrinsificationPhase.canIntrinsify(invokeForInlining, concrete, runtime); InliningUtil.inline(invokeForInlining, calleeGraph, false); replacements.add(anchoredReceiver); } if (shouldFallbackToInvoke()) { replacements.add(null); } if (GraalOptions.OptTailDuplication) { /* * We might want to perform tail duplication at the merge after a type switch, if there are invokes that would * benefit from the improvement in type information. */ FixedNode current = returnMerge; int opportunities = 0; do { if (current instanceof InvokeNode && ((InvokeNode) current).methodCallTarget().receiver() == originalReceiver) { opportunities++; } else if (current.inputs().contains(originalReceiver)) { opportunities++; } current = ((FixedWithNextNode) current).next(); } while (current instanceof FixedWithNextNode); if (opportunities > 0) { metricInliningTailDuplication.increment(); Debug.log("MultiTypeGuardInlineInfo starting tail duplication (%d opportunities)", opportunities); TailDuplicationPhase.tailDuplicate(returnMerge, TailDuplicationPhase.TRUE_DECISION, replacements); } } } private int getTypeCount(int concreteMethodIndex) { int count = 0; for (int i = 0; i < typesToConcretes.length; i++) { if (typesToConcretes[i] == concreteMethodIndex) { count++; } } return count; } private ResolvedJavaType getLeastCommonType(int concreteMethodIndex) { ResolvedJavaType commonType = null; for (int i = 0; i < typesToConcretes.length; i++) { if (typesToConcretes[i] == concreteMethodIndex) { if (commonType == null) { commonType = ptypes[i].getType(); } else { commonType = commonType.findLeastCommonAncestor(ptypes[i].getType()); } } } assert commonType != null; return commonType; } private void inlineSingleMethod(StructuredGraph graph, GraalCodeCacheProvider runtime, InliningCallback callback) { assert concretes.size() == 1 && ptypes.length > 1 && !shouldFallbackToInvoke() && notRecordedTypeProbability == 0; MergeNode calleeEntryNode = graph.add(new MergeNode()); calleeEntryNode.setProbability(invoke.probability()); LoadHubNode receiverHub = graph.add(new LoadHubNode(invoke.methodCallTarget().receiver())); graph.addBeforeFixed(invoke.node(), receiverHub); FixedNode unknownTypeNode = graph.add(new DeoptimizeNode(DeoptimizationAction.InvalidateReprofile, DeoptimizationReason.TypeCheckedInliningViolated, invoke.leafGraphId())); FixedNode dispatchOnType = createDispatchOnType(graph, receiverHub, new BeginNode[] {calleeEntryNode}, unknownTypeNode); FixedWithNextNode pred = (FixedWithNextNode) invoke.node().predecessor(); pred.setNext(dispatchOnType); calleeEntryNode.setNext(invoke.node()); ResolvedJavaMethod concrete = concretes.get(0); StructuredGraph calleeGraph = getGraph(concrete, callback); assert !IntrinsificationPhase.canIntrinsify(invoke, concrete, runtime); callback.recordMethodContentsAssumption(concrete); InliningUtil.inline(invoke, calleeGraph, false); } private FixedNode createDispatchOnType(StructuredGraph graph, LoadHubNode objectClassNode, BeginNode[] calleeEntryNodes, FixedNode unknownTypeSux) { assert ptypes.length > 1; ResolvedJavaType[] types = new ResolvedJavaType[ptypes.length]; double[] probabilities = new double[ptypes.length + 1]; BeginNode[] successors = new BeginNode[ptypes.length + 1]; int[] keySuccessors = new int[ptypes.length + 1]; for (int i = 0; i < ptypes.length; i++) { types[i] = ptypes[i].getType(); probabilities[i] = ptypes[i].getProbability(); FixedNode entry = calleeEntryNodes[typesToConcretes[i]]; if (entry instanceof MergeNode) { EndNode endNode = graph.add(new EndNode()); ((MergeNode) entry).addForwardEnd(endNode); entry = endNode; } successors[i] = BeginNode.begin(entry); keySuccessors[i] = i; } assert !(unknownTypeSux instanceof MergeNode); successors[successors.length - 1] = BeginNode.begin(unknownTypeSux); probabilities[successors.length - 1] = notRecordedTypeProbability; keySuccessors[successors.length - 1] = successors.length - 1; TypeSwitchNode typeSwitch = graph.add(new TypeSwitchNode(objectClassNode, successors, probabilities, types, probabilities, keySuccessors)); return typeSwitch; } private static BeginNode createInvocationBlock(StructuredGraph graph, Invoke invoke, MergeNode returnMerge, PhiNode returnValuePhi, MergeNode exceptionMerge, PhiNode exceptionObjectPhi, int predecessors, double probability, boolean useForInlining) { Invoke duplicatedInvoke = duplicateInvokeForInlining(graph, invoke, exceptionMerge, exceptionObjectPhi, useForInlining, probability); BeginNode calleeEntryNode = graph.add(predecessors > 1 ? new MergeNode() : new BeginNode()); calleeEntryNode.setNext(duplicatedInvoke.node()); calleeEntryNode.setProbability(probability); EndNode endNode = graph.add(new EndNode()); endNode.setProbability(probability); duplicatedInvoke.setNext(endNode); returnMerge.addForwardEnd(endNode); if (returnValuePhi != null) { returnValuePhi.addInput(duplicatedInvoke.node()); } return calleeEntryNode; } private static Invoke duplicateInvokeForInlining(StructuredGraph graph, Invoke invoke, MergeNode exceptionMerge, PhiNode exceptionObjectPhi, boolean useForInlining, double probability) { Invoke result = (Invoke) invoke.node().copyWithInputs(); Node callTarget = result.callTarget().copyWithInputs(); result.node().replaceFirstInput(result.callTarget(), callTarget); result.setUseForInlining(useForInlining); result.setProbability(probability); Kind kind = invoke.node().kind(); if (!kind.isVoid()) { FrameState stateAfter = invoke.stateAfter(); stateAfter = stateAfter.duplicate(stateAfter.bci); stateAfter.replaceFirstInput(invoke.node(), result.node()); result.setStateAfter(stateAfter); } if (invoke instanceof InvokeWithExceptionNode) { assert exceptionMerge != null && exceptionObjectPhi != null; InvokeWithExceptionNode invokeWithException = (InvokeWithExceptionNode) invoke; BeginNode exceptionEdge = invokeWithException.exceptionEdge(); ExceptionObjectNode exceptionObject = (ExceptionObjectNode) exceptionEdge.next(); FrameState stateAfterException = exceptionObject.stateAfter(); BeginNode newExceptionEdge = (BeginNode) exceptionEdge.copyWithInputs(); ExceptionObjectNode newExceptionObject = (ExceptionObjectNode) exceptionObject.copyWithInputs(); // set new state (pop old exception object, push new one) newExceptionObject.setStateAfter(stateAfterException.duplicateModified(stateAfterException.bci, stateAfterException.rethrowException(), Kind.Object, newExceptionObject)); newExceptionEdge.setNext(newExceptionObject); EndNode endNode = graph.add(new EndNode()); newExceptionObject.setNext(endNode); exceptionMerge.addForwardEnd(endNode); exceptionObjectPhi.addInput(newExceptionObject); ((InvokeWithExceptionNode) result).setExceptionEdge(newExceptionEdge); } return result; } @Override public String toString() { StringBuilder builder = new StringBuilder(shouldFallbackToInvoke() ? "megamorphic" : "polymorphic"); builder.append(String.format(", %d methods with %d type checks:", concretes.size(), ptypes.length)); for (int i = 0; i < concretes.size(); i++) { builder.append(MetaUtil.format(" %H.%n(%p):%r", concretes.get(i))); } return builder.toString(); } @Override public boolean canDeopt() { return true; } } /** * Represents an inlining opportunity where the current class hierarchy leads to a monomorphic target method, * but for which an assumption has to be registered because of non-final classes. */ private static class AssumptionInlineInfo extends ExactInlineInfo { public final ResolvedJavaType context; public AssumptionInlineInfo(Invoke invoke, double weight, int level, ResolvedJavaType context, ResolvedJavaMethod concrete) { super(invoke, weight, level, concrete); this.context = context; } @Override public void inline(StructuredGraph graph, GraalCodeCacheProvider runtime, InliningCallback callback) { if (Debug.isLogEnabled()) { String targetName = MetaUtil.format("%H.%n(%p):%r", invoke.methodCallTarget().targetMethod()); String concreteName = MetaUtil.format("%H.%n(%p):%r", concrete); Debug.log("recording concrete method assumption: %s on receiver type %s -> %s", targetName, context, concreteName); } callback.recordConcreteMethodAssumption(invoke.methodCallTarget().targetMethod(), context, concrete); super.inline(graph, runtime, callback); } @Override public String toString() { return "assumption " + MetaUtil.format("%H.%n(%p):%r", concrete); } @Override public boolean canDeopt() { return true; } } /** * Determines if inlining is possible at the given invoke node. * @param invoke the invoke that should be inlined * @param level the number of nested inlinings that lead to this invoke, or 0 if the invoke was part of the initial graph * @param runtime a GraalRuntime instance used to determine of the invoke can be inlined and/or should be intrinsified * @param callback a callback that is used to determine the weight of a specific inlining * @return an instance of InlineInfo, or null if no inlining is possible at the given invoke */ public static InlineInfo getInlineInfo(Invoke invoke, int level, GraalCodeCacheProvider runtime, Assumptions assumptions, InliningCallback callback, OptimisticOptimizations optimisticOpts) { if (!(invoke.callTarget() instanceof MethodCallTargetNode)) { // The invoke has already been lowered , or has been created as a low-level node. We have no method information. return null; } ResolvedJavaMethod parent = invoke.stateAfter().method(); MethodCallTargetNode callTarget = invoke.methodCallTarget(); ResolvedJavaMethod targetMethod = callTarget.targetMethod(); if (targetMethod == null) { return null; } if (!checkInvokeConditions(invoke)) { return null; } if (callTarget.invokeKind() == InvokeKind.Special || targetMethod.canBeStaticallyBound()) { if (checkTargetConditions(invoke, targetMethod, optimisticOpts)) { double weight = callback == null ? 0 : callback.inliningWeight(parent, targetMethod, invoke); return new ExactInlineInfo(invoke, weight, level, targetMethod); } return null; } ObjectStamp receiverStamp = callTarget.receiver().objectStamp(); ResolvedJavaType receiverType = receiverStamp.type(); if (receiverStamp.isExactType()) { assert receiverType.isSubtypeOf(targetMethod.getDeclaringClass()) : receiverType + " subtype of " + targetMethod.getDeclaringClass() + " for " + targetMethod; ResolvedJavaMethod resolved = receiverType.resolveMethod(targetMethod); if (checkTargetConditions(invoke, resolved, optimisticOpts)) { double weight = callback == null ? 0 : callback.inliningWeight(parent, resolved, invoke); return new ExactInlineInfo(invoke, weight, level, resolved); } return null; } ResolvedJavaType holder = targetMethod.getDeclaringClass(); if (receiverStamp.type() != null) { // the invoke target might be more specific than the holder (happens after inlining: locals lose their declared type...) // TODO (lstadler) fix this if (receiverType != null && receiverType.isSubtypeOf(holder)) { holder = receiverType; } } // TODO (thomaswue) fix this if (assumptions != null) { ResolvedJavaMethod concrete = holder.findUniqueConcreteMethod(targetMethod); if (concrete != null) { if (checkTargetConditions(invoke, concrete, optimisticOpts)) { double weight = callback == null ? 0 : callback.inliningWeight(parent, concrete, invoke); return new AssumptionInlineInfo(invoke, weight, level, holder, concrete); } return null; } } // type check based inlining return getTypeCheckedInlineInfo(invoke, level, callback, parent, targetMethod, optimisticOpts); } private static InlineInfo getTypeCheckedInlineInfo(Invoke invoke, int level, InliningCallback callback, ResolvedJavaMethod parent, ResolvedJavaMethod targetMethod, OptimisticOptimizations optimisticOpts) { ProfilingInfo profilingInfo = parent.getProfilingInfo(); JavaTypeProfile typeProfile = profilingInfo.getTypeProfile(invoke.bci()); if (typeProfile != null) { ProfiledType[] ptypes = typeProfile.getTypes(); if (ptypes != null && ptypes.length > 0) { double notRecordedTypeProbability = typeProfile.getNotRecordedProbability(); if (ptypes.length == 1 && notRecordedTypeProbability == 0) { if (optimisticOpts.inlineMonomorphicCalls()) { ResolvedJavaType type = ptypes[0].getType(); ResolvedJavaMethod concrete = type.resolveMethod(targetMethod); if (checkTargetConditions(invoke, concrete, optimisticOpts)) { double weight = callback == null ? 0 : callback.inliningWeight(parent, concrete, invoke); return new TypeGuardInlineInfo(invoke, weight, level, concrete, type); } Debug.log("not inlining %s because method can't be inlined", methodName(targetMethod, invoke)); return null; } else { Debug.log("not inlining %s because GraalOptions.InlineMonomorphicCalls == false", methodName(targetMethod, invoke)); return null; } } else { invoke.setMegamorphic(true); if (optimisticOpts.inlinePolymorphicCalls() && notRecordedTypeProbability == 0 || optimisticOpts.inlineMegamorphicCalls() && notRecordedTypeProbability > 0) { // TODO (chaeubl) inlining of multiple methods should work differently // 1. check which methods can be inlined // 2. for those methods, use weight and probability to compute which of them should be inlined // 3. do the inlining // a) all seen methods can be inlined -> do so and guard with deopt // b) some methods can be inlined -> inline them and fall back to invocation if violated // TODO (chaeubl) sort types by probability // determine concrete methods and map type to specific method ArrayList<ResolvedJavaMethod> concreteMethods = new ArrayList<>(); int[] typesToConcretes = new int[ptypes.length]; for (int i = 0; i < ptypes.length; i++) { ResolvedJavaMethod concrete = ptypes[i].getType().resolveMethod(targetMethod); int index = concreteMethods.indexOf(concrete); if (index < 0) { index = concreteMethods.size(); concreteMethods.add(concrete); } typesToConcretes[i] = index; } double totalWeight = 0; boolean canInline = true; for (ResolvedJavaMethod concrete: concreteMethods) { if (!checkTargetConditions(invoke, concrete, optimisticOpts)) { canInline = false; break; } totalWeight += callback == null ? 0 : callback.inliningWeight(parent, concrete, invoke); } if (canInline) { return new MultiTypeGuardInlineInfo(invoke, totalWeight, level, concreteMethods, ptypes, typesToConcretes, notRecordedTypeProbability); } else { Debug.log("not inlining %s because it is a polymorphic method call and at least one invoked method cannot be inlined", methodName(targetMethod, invoke)); return null; } } else { if (!optimisticOpts.inlinePolymorphicCalls() && notRecordedTypeProbability == 0) { Debug.log("not inlining %s because GraalOptions.InlinePolymorphicCalls == false", methodName(targetMethod, invoke)); } else { Debug.log("not inlining %s because GraalOptions.InlineMegamorphicCalls == false", methodName(targetMethod, invoke)); } return null; } } } Debug.log("not inlining %s because no types/probabilities were recorded", methodName(targetMethod, invoke)); return null; } else { Debug.log("not inlining %s because no type profile exists", methodName(targetMethod, invoke)); return null; } } private static PiNode createAnchoredReceiver(StructuredGraph graph, FixedNode anchor, ResolvedJavaType commonType, ValueNode receiver, boolean exact) { // to avoid that floating reads on receiver fields float above the type check return graph.unique(new PiNode(receiver, anchor, exact ? StampFactory.exactNonNull(commonType) : StampFactory.declaredNonNull(commonType))); } private static boolean checkInvokeConditions(Invoke invoke) { if (invoke.stateAfter() == null) { Debug.log("not inlining %s because the invoke has no after state", methodName(invoke.methodCallTarget().targetMethod(), invoke)); return false; } if (invoke.predecessor() == null) { Debug.log("not inlining %s because the invoke is dead code", methodName(invoke.methodCallTarget().targetMethod(), invoke)); return false; } if (!invoke.useForInlining()) { Debug.log("not inlining %s because invoke is marked to be not used for inlining", methodName(invoke.methodCallTarget().targetMethod(), invoke)); return false; } return true; } private static boolean checkTargetConditions(Invoke invoke, JavaMethod method, OptimisticOptimizations optimisticOpts) { if (method == null) { Debug.log("not inlining because method is not resolved"); return false; } if (!(method instanceof ResolvedJavaMethod)) { Debug.log("not inlining %s because it is unresolved", method.toString()); return false; } ResolvedJavaMethod resolvedMethod = (ResolvedJavaMethod) method; if (Modifier.isNative(resolvedMethod.getModifiers())) { Debug.log("not inlining %s because it is a native method", methodName(resolvedMethod, invoke)); return false; } if (Modifier.isAbstract(resolvedMethod.getModifiers())) { Debug.log("not inlining %s because it is an abstract method", methodName(resolvedMethod, invoke)); return false; } if (!resolvedMethod.getDeclaringClass().isInitialized()) { Debug.log("not inlining %s because of non-initialized class", methodName(resolvedMethod, invoke)); return false; } if (!resolvedMethod.canBeInlined()) { Debug.log("not inlining %s because it is marked non-inlinable", methodName(resolvedMethod, invoke)); return false; } if (computeRecursiveInliningLevel(invoke.stateAfter(), (ResolvedJavaMethod) method) > GraalOptions.MaximumRecursiveInlining) { Debug.log("not inlining %s because it exceeds the maximum recursive inlining depth", methodName(resolvedMethod, invoke)); return false; } OptimisticOptimizations calleeOpts = new OptimisticOptimizations(resolvedMethod); if (calleeOpts.lessOptimisticThan(optimisticOpts)) { Debug.log("not inlining %s because callee uses less optimistic optimizations than caller", methodName(resolvedMethod, invoke)); return false; } return true; } private static int computeRecursiveInliningLevel(FrameState state, ResolvedJavaMethod method) { assert state != null; int count = 0; FrameState curState = state; while (curState != null) { if (curState.method() == method) { count++; } curState = curState.outerFrameState(); } return count; } /** * Performs an actual inlining, thereby replacing the given invoke with the given inlineGraph. * * @param invoke the invoke that will be replaced * @param inlineGraph the graph that the invoke will be replaced with * @param receiverNullCheck true if a null check needs to be generated for non-static inlinings, false if no such check is required */ public static void inline(Invoke invoke, StructuredGraph inlineGraph, boolean receiverNullCheck) { NodeInputList<ValueNode> parameters = invoke.callTarget().arguments(); StructuredGraph graph = (StructuredGraph) invoke.node().graph(); FrameState stateAfter = invoke.stateAfter(); assert stateAfter.isAlive(); IdentityHashMap<Node, Node> replacements = new IdentityHashMap<>(); ArrayList<Node> nodes = new ArrayList<>(); ReturnNode returnNode = null; UnwindNode unwindNode = null; StartNode entryPointNode = inlineGraph.start(); FixedNode firstCFGNode = entryPointNode.next(); for (Node node : inlineGraph.getNodes()) { if (node == entryPointNode || node == entryPointNode.stateAfter()) { // Do nothing. } else if (node instanceof LocalNode) { replacements.put(node, parameters.get(((LocalNode) node).index())); } else { nodes.add(node); if (node instanceof ReturnNode) { assert returnNode == null; returnNode = (ReturnNode) node; } else if (node instanceof UnwindNode) { assert unwindNode == null; unwindNode = (UnwindNode) node; } } } replacements.put(entryPointNode, BeginNode.prevBegin(invoke.node())); // ensure proper anchoring of things that where anchored to the StartNode assert invoke.node().successors().first() != null : invoke; assert invoke.node().predecessor() != null; Map<Node, Node> duplicates = graph.addDuplicates(nodes, replacements); FixedNode firstCFGNodeDuplicate = (FixedNode) duplicates.get(firstCFGNode); if (receiverNullCheck) { receiverNullCheck(invoke); } invoke.node().replaceAtPredecessor(firstCFGNodeDuplicate); FrameState stateAtExceptionEdge = null; if (invoke instanceof InvokeWithExceptionNode) { InvokeWithExceptionNode invokeWithException = ((InvokeWithExceptionNode) invoke); if (unwindNode != null) { assert unwindNode.predecessor() != null; assert invokeWithException.exceptionEdge().successors().count() == 1; ExceptionObjectNode obj = (ExceptionObjectNode) invokeWithException.exceptionEdge().next(); stateAtExceptionEdge = obj.stateAfter(); UnwindNode unwindDuplicate = (UnwindNode) duplicates.get(unwindNode); obj.replaceAtUsages(unwindDuplicate.exception()); unwindDuplicate.clearInputs(); Node n = obj.next(); obj.setNext(null); unwindDuplicate.replaceAndDelete(n); } else { invokeWithException.killExceptionEdge(); } } else { if (unwindNode != null) { UnwindNode unwindDuplicate = (UnwindNode) duplicates.get(unwindNode); DeoptimizeNode deoptimizeNode = new DeoptimizeNode(DeoptimizationAction.InvalidateRecompile, DeoptimizationReason.NotCompiledExceptionHandler, invoke.leafGraphId()); unwindDuplicate.replaceAndDelete(graph.add(deoptimizeNode)); // move the deopt upwards if there is a monitor exit that tries to use the "after exception" frame state // (because there is no "after exception" frame state!) if (deoptimizeNode.predecessor() instanceof MonitorExitNode) { MonitorExitNode monitorExit = (MonitorExitNode) deoptimizeNode.predecessor(); if (monitorExit.stateAfter() != null && monitorExit.stateAfter().bci == FrameState.AFTER_EXCEPTION_BCI) { FrameState monitorFrameState = monitorExit.stateAfter(); graph.removeFixed(monitorExit); monitorFrameState.safeDelete(); } } } } FrameState outerFrameState = null; double invokeProbability = invoke.node().probability(); for (Node node : duplicates.values()) { if (GraalOptions.ProbabilityAnalysis) { if (node instanceof FixedNode) { FixedNode fixed = (FixedNode) node; double newProbability = fixed.probability() * invokeProbability; if (GraalOptions.LimitInlinedProbability) { newProbability = Math.min(newProbability, invokeProbability); } fixed.setProbability(newProbability); } } if (node instanceof FrameState) { FrameState frameState = (FrameState) node; assert frameState.bci != FrameState.BEFORE_BCI; if (frameState.bci == FrameState.AFTER_BCI) { frameState.replaceAndDelete(stateAfter); } else if (frameState.bci == FrameState.AFTER_EXCEPTION_BCI) { if (frameState.isAlive()) { assert stateAtExceptionEdge != null; frameState.replaceAndDelete(stateAtExceptionEdge); } else { assert stateAtExceptionEdge == null; } } else { // only handle the outermost frame states if (frameState.outerFrameState() == null) { assert frameState.method() == inlineGraph.method(); if (outerFrameState == null) { outerFrameState = stateAfter.duplicateModified(invoke.bci(), stateAfter.rethrowException(), invoke.node().kind()); outerFrameState.setDuringCall(true); } frameState.setOuterFrameState(outerFrameState); } } } } Node returnValue = null; if (returnNode != null) { if (returnNode.result() instanceof LocalNode) { returnValue = replacements.get(returnNode.result()); } else { returnValue = duplicates.get(returnNode.result()); } invoke.node().replaceAtUsages(returnValue); Node returnDuplicate = duplicates.get(returnNode); returnDuplicate.clearInputs(); Node n = invoke.next(); invoke.setNext(null); returnDuplicate.replaceAndDelete(n); } invoke.node().clearInputs(); invoke.node().replaceAtUsages(null); GraphUtil.killCFG(invoke.node()); if (stateAfter.usages().isEmpty()) { stateAfter.safeDelete(); } } public static void receiverNullCheck(Invoke invoke) { MethodCallTargetNode callTarget = invoke.methodCallTarget(); StructuredGraph graph = (StructuredGraph) invoke.graph(); NodeInputList<ValueNode> parameters = callTarget.arguments(); ValueNode firstParam = parameters.size() <= 0 ? null : parameters.get(0); if (!callTarget.isStatic() && firstParam.kind() == Kind.Object && !firstParam.objectStamp().nonNull()) { graph.addBeforeFixed(invoke.node(), graph.add(new FixedGuardNode(graph.unique(new IsNullNode(firstParam)), DeoptimizationReason.NullCheckException, DeoptimizationAction.InvalidateReprofile, true, invoke.leafGraphId()))); } } }