| /* |
| * Copyright (c) 2011, 2016, 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 org.graalvm.compiler.hotspot.replacements.arraycopy; |
| |
| import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfig.INJECTED_VMCONFIG; |
| import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfigBase.INJECTED_METAACCESS; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.KLASS_SUPER_CHECK_OFFSET_LOCATION; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.OBJ_ARRAY_KLASS_ELEMENT_KLASS_LOCATION; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayClassElementOffset; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.getArrayBaseOffset; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.loadHub; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.readLayoutHelper; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.superCheckOffsetOffset; |
| import static org.graalvm.compiler.nodes.extended.BranchProbabilityNode.FREQUENT_PROBABILITY; |
| import static org.graalvm.compiler.nodes.extended.BranchProbabilityNode.LIKELY_PROBABILITY; |
| import static org.graalvm.compiler.nodes.extended.BranchProbabilityNode.NOT_FREQUENT_PROBABILITY; |
| import static org.graalvm.compiler.nodes.extended.BranchProbabilityNode.SLOW_PATH_PROBABILITY; |
| import static org.graalvm.compiler.nodes.extended.BranchProbabilityNode.probability; |
| |
| import java.lang.reflect.Method; |
| import java.util.EnumMap; |
| |
| import jdk.internal.vm.compiler.collections.UnmodifiableEconomicMap; |
| import org.graalvm.compiler.api.directives.GraalDirectives; |
| import org.graalvm.compiler.api.replacements.Fold; |
| import org.graalvm.compiler.api.replacements.Snippet; |
| import org.graalvm.compiler.api.replacements.Snippet.ConstantParameter; |
| import org.graalvm.compiler.debug.DebugHandlersFactory; |
| import org.graalvm.compiler.debug.GraalError; |
| import org.graalvm.compiler.graph.Node; |
| import org.graalvm.compiler.hotspot.meta.HotSpotProviders; |
| import org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil; |
| import org.graalvm.compiler.hotspot.word.KlassPointer; |
| import org.graalvm.compiler.nodes.CallTargetNode; |
| import org.graalvm.compiler.nodes.DeoptimizeNode; |
| import org.graalvm.compiler.nodes.Invoke; |
| import org.graalvm.compiler.nodes.InvokeNode; |
| import org.graalvm.compiler.nodes.NamedLocationIdentity; |
| import org.graalvm.compiler.nodes.NodeView; |
| import org.graalvm.compiler.nodes.PiNode; |
| import org.graalvm.compiler.nodes.StructuredGraph; |
| import org.graalvm.compiler.nodes.ValueNode; |
| import org.graalvm.compiler.nodes.extended.RawLoadNode; |
| import org.graalvm.compiler.nodes.extended.RawStoreNode; |
| import org.graalvm.compiler.nodes.java.ArrayLengthNode; |
| import org.graalvm.compiler.nodes.spi.LoweringTool; |
| import org.graalvm.compiler.nodes.type.StampTool; |
| import org.graalvm.compiler.nodes.util.GraphUtil; |
| import org.graalvm.compiler.options.OptionValues; |
| import org.graalvm.compiler.replacements.ReplacementsUtil; |
| import org.graalvm.compiler.replacements.SnippetCounter; |
| import org.graalvm.compiler.replacements.SnippetCounter.Group; |
| import org.graalvm.compiler.replacements.SnippetIntegerHistogram; |
| import org.graalvm.compiler.replacements.SnippetTemplate; |
| import org.graalvm.compiler.replacements.SnippetTemplate.Arguments; |
| import org.graalvm.compiler.replacements.SnippetTemplate.SnippetInfo; |
| import org.graalvm.compiler.replacements.Snippets; |
| import org.graalvm.compiler.replacements.nodes.BasicArrayCopyNode; |
| import org.graalvm.compiler.replacements.nodes.ExplodeLoopNode; |
| import org.graalvm.compiler.word.Word; |
| import jdk.internal.vm.compiler.word.LocationIdentity; |
| import jdk.internal.vm.compiler.word.WordFactory; |
| |
| import jdk.vm.ci.code.TargetDescription; |
| import jdk.vm.ci.meta.DeoptimizationAction; |
| import jdk.vm.ci.meta.DeoptimizationReason; |
| import jdk.vm.ci.meta.JavaKind; |
| import jdk.vm.ci.meta.ResolvedJavaMethod; |
| import jdk.vm.ci.meta.ResolvedJavaType; |
| |
| public class ArrayCopySnippets implements Snippets { |
| |
| private enum ArrayCopyTypeCheck { |
| UNDEFINED_ARRAY_TYPE_CHECK, |
| // either we know that both objects are arrays and have the same type, |
| // or we apply generic array copy snippet, which enforces type check |
| NO_ARRAY_TYPE_CHECK, |
| // can be used when we know that one of the objects is a primitive array |
| HUB_BASED_ARRAY_TYPE_CHECK, |
| // can be used when we know that one of the objects is an object array |
| LAYOUT_HELPER_BASED_ARRAY_TYPE_CHECK |
| } |
| |
| @Snippet |
| public static void arraycopyZeroLengthSnippet(Object src, int srcPos, Object dest, int destPos, int length, @ConstantParameter ArrayCopyTypeCheck arrayTypeCheck, |
| @ConstantParameter Counters counters) { |
| Object nonNullSrc = GraalDirectives.guardingNonNull(src); |
| Object nonNullDest = GraalDirectives.guardingNonNull(dest); |
| checkArrayTypes(nonNullSrc, nonNullDest, arrayTypeCheck); |
| checkLimits(nonNullSrc, srcPos, nonNullDest, destPos, length, counters); |
| counters.zeroLengthStaticCounter.inc(); |
| } |
| |
| @Snippet |
| public static void arraycopyExactSnippet(Object src, int srcPos, Object dest, int destPos, int length, @ConstantParameter ArrayCopyTypeCheck arrayTypeCheck, |
| @ConstantParameter JavaKind elementKind, @ConstantParameter SnippetCounter elementKindCounter, @ConstantParameter SnippetCounter elementKindCopiedCounter, |
| @ConstantParameter Counters counters) { |
| Object nonNullSrc = GraalDirectives.guardingNonNull(src); |
| Object nonNullDest = GraalDirectives.guardingNonNull(dest); |
| checkArrayTypes(nonNullSrc, nonNullDest, arrayTypeCheck); |
| checkLimits(nonNullSrc, srcPos, nonNullDest, destPos, length, counters); |
| incrementLengthCounter(length, counters); |
| |
| elementKindCounter.inc(); |
| elementKindCopiedCounter.add(length); |
| ArrayCopyCallNode.arraycopy(nonNullSrc, srcPos, nonNullDest, destPos, length, elementKind); |
| } |
| |
| @Snippet |
| public static void arraycopyUnrolledSnippet(Object src, int srcPos, Object dest, int destPos, int length, @ConstantParameter ArrayCopyTypeCheck arrayTypeCheck, |
| @ConstantParameter JavaKind elementKind, @ConstantParameter int unrolledLength, @ConstantParameter Counters counters) { |
| Object nonNullSrc = GraalDirectives.guardingNonNull(src); |
| Object nonNullDest = GraalDirectives.guardingNonNull(dest); |
| checkArrayTypes(nonNullSrc, nonNullDest, arrayTypeCheck); |
| checkLimits(nonNullSrc, srcPos, nonNullDest, destPos, length, counters); |
| incrementLengthCounter(length, counters); |
| |
| unrolledArraycopyWork(nonNullSrc, srcPos, nonNullDest, destPos, unrolledLength, elementKind); |
| } |
| |
| @Snippet |
| public static void arraycopyCheckcastSnippet(Object src, int srcPos, Object dest, int destPos, int length, @ConstantParameter ArrayCopyTypeCheck arrayTypeCheck, |
| @ConstantParameter Counters counters, @ConstantParameter SnippetInfo workSnippet, @ConstantParameter JavaKind elementKind) { |
| Object nonNullSrc = GraalDirectives.guardingNonNull(src); |
| Object nonNullDest = GraalDirectives.guardingNonNull(dest); |
| checkArrayTypes(nonNullSrc, nonNullDest, arrayTypeCheck); |
| checkLimits(nonNullSrc, srcPos, nonNullDest, destPos, length, counters); |
| incrementLengthCounter(length, counters); |
| |
| ArrayCopyWithSlowPathNode.arraycopy(nonNullSrc, srcPos, nonNullDest, destPos, length, workSnippet, elementKind); |
| } |
| |
| @Snippet |
| public static void arraycopyGenericSnippet(Object src, int srcPos, Object dest, int destPos, int length, @ConstantParameter ArrayCopyTypeCheck arrayTypeCheck, @ConstantParameter Counters counters, |
| @ConstantParameter SnippetInfo workSnippet, @ConstantParameter JavaKind elementKind) { |
| Object nonNullSrc = GraalDirectives.guardingNonNull(src); |
| Object nonNullDest = GraalDirectives.guardingNonNull(dest); |
| checkArrayTypes(nonNullSrc, nonNullDest, arrayTypeCheck); |
| checkLimits(nonNullSrc, srcPos, nonNullDest, destPos, length, counters); |
| incrementLengthCounter(length, counters); |
| |
| ArrayCopyWithSlowPathNode.arraycopy(nonNullSrc, srcPos, nonNullDest, destPos, length, workSnippet, elementKind); |
| } |
| |
| @Snippet |
| public static void arraycopyNativeSnippet(Object src, int srcPos, Object dest, int destPos, int length, @ConstantParameter Counters counters) { |
| // all checks are done in the native method, so no need to emit additional checks here |
| incrementLengthCounter(length, counters); |
| counters.systemArraycopyCounter.inc(); |
| counters.systemArraycopyCopiedCounter.add(length); |
| |
| System.arraycopy(src, srcPos, dest, destPos, length); |
| } |
| |
| @Fold |
| static LocationIdentity getArrayLocation(JavaKind kind) { |
| return NamedLocationIdentity.getArrayLocation(kind); |
| } |
| |
| private static void unrolledArraycopyWork(Object nonNullSrc, int srcPos, Object nonNullDest, int destPos, int length, JavaKind elementKind) { |
| int scale = HotSpotReplacementsUtil.arrayIndexScale(INJECTED_METAACCESS, elementKind); |
| int arrayBaseOffset = getArrayBaseOffset(INJECTED_METAACCESS, elementKind); |
| LocationIdentity arrayLocation = getArrayLocation(elementKind); |
| |
| long sourceOffset = arrayBaseOffset + (long) srcPos * scale; |
| long destOffset = arrayBaseOffset + (long) destPos * scale; |
| long position = 0; |
| long delta = scale; |
| if (probability(NOT_FREQUENT_PROBABILITY, nonNullSrc == nonNullDest && srcPos < destPos)) { |
| // bad aliased case so we need to copy the array from back to front |
| position = (long) (length - 1) * scale; |
| delta = -delta; |
| } |
| |
| // the length was already checked before - we can emit unconditional instructions |
| ExplodeLoopNode.explodeLoop(); |
| for (int iteration = 0; iteration < length; iteration++) { |
| Object value = RawLoadNode.load(nonNullSrc, sourceOffset + position, elementKind, arrayLocation); |
| RawStoreNode.storeObject(nonNullDest, destOffset + position, value, elementKind, arrayLocation, false); |
| position += delta; |
| } |
| } |
| |
| @Snippet(allowPartialIntrinsicArgumentMismatch = true) |
| public static void checkcastArraycopyWithSlowPathWork(Object src, int srcPos, Object dest, int destPos, int length, @ConstantParameter Counters counters) { |
| if (probability(FREQUENT_PROBABILITY, length > 0)) { |
| Object nonNullSrc = PiNode.asNonNullObject(src); |
| Object nonNullDest = PiNode.asNonNullObject(dest); |
| KlassPointer srcKlass = loadHub(nonNullSrc); |
| KlassPointer destKlass = loadHub(nonNullDest); |
| if (probability(LIKELY_PROBABILITY, srcKlass == destKlass)) { |
| // no storecheck required. |
| counters.objectCheckcastSameTypeCounter.inc(); |
| counters.objectCheckcastSameTypeCopiedCounter.add(length); |
| ArrayCopyCallNode.arraycopyObjectKillsAny(nonNullSrc, srcPos, nonNullDest, destPos, length); |
| } else { |
| KlassPointer destElemKlass = destKlass.readKlassPointer(arrayClassElementOffset(INJECTED_VMCONFIG), OBJ_ARRAY_KLASS_ELEMENT_KLASS_LOCATION); |
| Word superCheckOffset = WordFactory.signed(destElemKlass.readInt(superCheckOffsetOffset(INJECTED_VMCONFIG), KLASS_SUPER_CHECK_OFFSET_LOCATION)); |
| |
| counters.objectCheckcastDifferentTypeCounter.inc(); |
| counters.objectCheckcastDifferentTypeCopiedCounter.add(length); |
| |
| int copiedElements = CheckcastArrayCopyCallNode.checkcastArraycopy(nonNullSrc, srcPos, nonNullDest, destPos, length, superCheckOffset, destElemKlass, false); |
| if (probability(SLOW_PATH_PROBABILITY, copiedElements != 0)) { |
| /* |
| * the stub doesn't throw the ArrayStoreException, but returns the number of |
| * copied elements (xor'd with -1). |
| */ |
| copiedElements ^= -1; |
| System.arraycopy(nonNullSrc, srcPos + copiedElements, nonNullDest, destPos + copiedElements, length - copiedElements); |
| } |
| } |
| } |
| } |
| |
| @Snippet(allowPartialIntrinsicArgumentMismatch = true) |
| public static void genericArraycopyWithSlowPathWork(Object src, int srcPos, Object dest, int destPos, int length, @ConstantParameter Counters counters) { |
| // The length > 0 check should not be placed here because generic array copy stub should |
| // enforce type check. This is fine performance-wise because this snippet is rarely used. |
| counters.genericArraycopyDifferentTypeCounter.inc(); |
| counters.genericArraycopyDifferentTypeCopiedCounter.add(length); |
| int copiedElements = GenericArrayCopyCallNode.genericArraycopy(src, srcPos, dest, destPos, length); |
| if (probability(SLOW_PATH_PROBABILITY, copiedElements != 0)) { |
| /* |
| * the stub doesn't throw the ArrayStoreException, but returns the number of copied |
| * elements (xor'd with -1). |
| */ |
| copiedElements ^= -1; |
| System.arraycopy(src, srcPos + copiedElements, dest, destPos + copiedElements, length - copiedElements); |
| } |
| } |
| |
| private static void incrementLengthCounter(int length, Counters counters) { |
| counters.lengthHistogram.inc(length); |
| } |
| |
| private static void checkLimits(Object src, int srcPos, Object dest, int destPos, int length, Counters counters) { |
| if (probability(SLOW_PATH_PROBABILITY, srcPos < 0) || |
| probability(SLOW_PATH_PROBABILITY, destPos < 0) || |
| probability(SLOW_PATH_PROBABILITY, length < 0) || |
| probability(SLOW_PATH_PROBABILITY, srcPos > ArrayLengthNode.arrayLength(src) - length) || |
| probability(SLOW_PATH_PROBABILITY, destPos > ArrayLengthNode.arrayLength(dest) - length)) { |
| counters.checkAIOOBECounter.inc(); |
| DeoptimizeNode.deopt(DeoptimizationAction.None, DeoptimizationReason.RuntimeConstraint); |
| } |
| counters.checkSuccessCounter.inc(); |
| } |
| |
| private static void checkArrayTypes(Object nonNullSrc, Object nonNullDest, ArrayCopyTypeCheck arrayTypeCheck) { |
| if (arrayTypeCheck == ArrayCopyTypeCheck.NO_ARRAY_TYPE_CHECK) { |
| // nothing to do |
| } else if (arrayTypeCheck == ArrayCopyTypeCheck.HUB_BASED_ARRAY_TYPE_CHECK) { |
| KlassPointer srcHub = loadHub(nonNullSrc); |
| KlassPointer destHub = loadHub(nonNullDest); |
| if (probability(SLOW_PATH_PROBABILITY, srcHub != destHub)) { |
| DeoptimizeNode.deopt(DeoptimizationAction.None, DeoptimizationReason.RuntimeConstraint); |
| } |
| } else if (arrayTypeCheck == ArrayCopyTypeCheck.LAYOUT_HELPER_BASED_ARRAY_TYPE_CHECK) { |
| KlassPointer srcHub = loadHub(nonNullSrc); |
| KlassPointer destHub = loadHub(nonNullDest); |
| if (probability(SLOW_PATH_PROBABILITY, readLayoutHelper(srcHub) != readLayoutHelper(destHub))) { |
| DeoptimizeNode.deopt(DeoptimizationAction.None, DeoptimizationReason.RuntimeConstraint); |
| } |
| } else { |
| ReplacementsUtil.staticAssert(false, "unknown array type check"); |
| } |
| } |
| |
| static class Counters { |
| final SnippetCounter checkSuccessCounter; |
| final SnippetCounter checkAIOOBECounter; |
| |
| final SnippetCounter zeroLengthStaticCounter; |
| final SnippetIntegerHistogram lengthHistogram; |
| |
| final SnippetCounter systemArraycopyCounter; |
| final SnippetCounter systemArraycopyCopiedCounter; |
| |
| final SnippetCounter genericArraycopyDifferentTypeCopiedCounter; |
| final SnippetCounter genericArraycopyDifferentTypeCounter; |
| |
| final SnippetCounter objectCheckcastSameTypeCopiedCounter; |
| final SnippetCounter objectCheckcastSameTypeCounter; |
| final SnippetCounter objectCheckcastDifferentTypeCopiedCounter; |
| final SnippetCounter objectCheckcastDifferentTypeCounter; |
| |
| final EnumMap<JavaKind, SnippetCounter> arraycopyCallCounters = new EnumMap<>(JavaKind.class); |
| final EnumMap<JavaKind, SnippetCounter> arraycopyCallCopiedCounters = new EnumMap<>(JavaKind.class); |
| |
| Counters(SnippetCounter.Group.Factory factory) { |
| final Group checkCounters = factory.createSnippetCounterGroup("System.arraycopy checkInputs"); |
| final Group callCounters = factory.createSnippetCounterGroup("System.arraycopy calls"); |
| final Group copiedElementsCounters = factory.createSnippetCounterGroup("System.arraycopy copied elements"); |
| final Group lengthCounters = factory.createSnippetCounterGroup("System.arraycopy with 0-length"); |
| |
| checkSuccessCounter = new SnippetCounter(checkCounters, "checkSuccess", "checkSuccess"); |
| checkAIOOBECounter = new SnippetCounter(checkCounters, "checkAIOOBE", "checkAIOOBE"); |
| |
| zeroLengthStaticCounter = new SnippetCounter(lengthCounters, "0-length copy static", "calls where the length is statically 0"); |
| lengthHistogram = new SnippetIntegerHistogram(lengthCounters, 2, "length", "length"); |
| |
| systemArraycopyCounter = new SnippetCounter(callCounters, "native System.arraycopy", "JNI-based System.arraycopy call"); |
| systemArraycopyCopiedCounter = new SnippetCounter(copiedElementsCounters, "native System.arraycopy", "JNI-based System.arraycopy call"); |
| |
| genericArraycopyDifferentTypeCounter = new SnippetCounter(callCounters, "generic[] stub", "generic arraycopy stub"); |
| genericArraycopyDifferentTypeCopiedCounter = new SnippetCounter(copiedElementsCounters, "generic[] stub", "generic arraycopy stub"); |
| |
| objectCheckcastSameTypeCounter = new SnippetCounter(callCounters, "checkcast object[] (same-type)", "checkcast object[] stub but src.klass == dest.klass Object[] arrays"); |
| objectCheckcastSameTypeCopiedCounter = new SnippetCounter(copiedElementsCounters, "checkcast object[] (same-type)", "checkcast object[] stub but src.klass == dest.klass Object[] arrays"); |
| objectCheckcastDifferentTypeCounter = new SnippetCounter(callCounters, "checkcast object[] (store-check)", "checkcast object[] stub with store check"); |
| objectCheckcastDifferentTypeCopiedCounter = new SnippetCounter(copiedElementsCounters, "checkcast object[] (store-check)", "checkcast object[] stub with store check"); |
| |
| createArraycopyCounter(JavaKind.Byte, callCounters, copiedElementsCounters); |
| createArraycopyCounter(JavaKind.Boolean, callCounters, copiedElementsCounters); |
| createArraycopyCounter(JavaKind.Char, callCounters, copiedElementsCounters); |
| createArraycopyCounter(JavaKind.Short, callCounters, copiedElementsCounters); |
| createArraycopyCounter(JavaKind.Int, callCounters, copiedElementsCounters); |
| createArraycopyCounter(JavaKind.Long, callCounters, copiedElementsCounters); |
| createArraycopyCounter(JavaKind.Float, callCounters, copiedElementsCounters); |
| createArraycopyCounter(JavaKind.Double, callCounters, copiedElementsCounters); |
| createArraycopyCounter(JavaKind.Object, callCounters, copiedElementsCounters); |
| } |
| |
| void createArraycopyCounter(JavaKind kind, Group counters, Group copiedCounters) { |
| arraycopyCallCounters.put(kind, new SnippetCounter(counters, kind + "[] stub", "arraycopy call for " + kind + "[] arrays")); |
| arraycopyCallCopiedCounters.put(kind, new SnippetCounter(copiedCounters, kind + "[] stub", "arraycopy call for " + kind + "[] arrays")); |
| } |
| } |
| |
| public static class Templates extends SnippetTemplate.AbstractTemplates { |
| private final SnippetInfo arraycopyGenericSnippet = snippet("arraycopyGenericSnippet"); |
| private final SnippetInfo arraycopyUnrolledSnippet = snippet("arraycopyUnrolledSnippet"); |
| private final SnippetInfo arraycopyExactSnippet = snippet("arraycopyExactSnippet"); |
| private final SnippetInfo arraycopyZeroLengthSnippet = snippet("arraycopyZeroLengthSnippet"); |
| private final SnippetInfo arraycopyCheckcastSnippet = snippet("arraycopyCheckcastSnippet"); |
| private final SnippetInfo arraycopyNativeSnippet = snippet("arraycopyNativeSnippet"); |
| |
| private final SnippetInfo checkcastArraycopyWithSlowPathWork = snippet("checkcastArraycopyWithSlowPathWork"); |
| private final SnippetInfo genericArraycopyWithSlowPathWork = snippet("genericArraycopyWithSlowPathWork"); |
| |
| private ResolvedJavaMethod originalArraycopy; |
| private final Counters counters; |
| |
| public Templates(OptionValues options, Iterable<DebugHandlersFactory> factories, SnippetCounter.Group.Factory factory, HotSpotProviders providers, TargetDescription target) { |
| super(options, factories, providers, providers.getSnippetReflection(), target); |
| this.counters = new Counters(factory); |
| } |
| |
| protected SnippetInfo snippet(String methodName) { |
| SnippetInfo info = snippet(ArrayCopySnippets.class, methodName, LocationIdentity.any()); |
| info.setOriginalMethod(originalArraycopy()); |
| return info; |
| } |
| |
| public void lower(ArrayCopyNode arraycopy, LoweringTool tool) { |
| JavaKind elementKind = selectComponentKind(arraycopy); |
| SnippetInfo snippetInfo; |
| ArrayCopyTypeCheck arrayTypeCheck; |
| |
| ResolvedJavaType srcType = StampTool.typeOrNull(arraycopy.getSource().stamp(NodeView.DEFAULT)); |
| ResolvedJavaType destType = StampTool.typeOrNull(arraycopy.getDestination().stamp(NodeView.DEFAULT)); |
| if (!canBeArray(srcType) || !canBeArray(destType)) { |
| // at least one of the objects is definitely not an array - use the native call |
| // right away as the copying will fail anyways |
| snippetInfo = arraycopyNativeSnippet; |
| arrayTypeCheck = ArrayCopyTypeCheck.UNDEFINED_ARRAY_TYPE_CHECK; |
| } else { |
| ResolvedJavaType srcComponentType = srcType == null ? null : srcType.getComponentType(); |
| ResolvedJavaType destComponentType = destType == null ? null : destType.getComponentType(); |
| |
| if (arraycopy.isExact()) { |
| // there is a sufficient type match - we don't need any additional type checks |
| snippetInfo = arraycopyExactSnippet; |
| arrayTypeCheck = ArrayCopyTypeCheck.NO_ARRAY_TYPE_CHECK; |
| } else if (srcComponentType == null && destComponentType == null) { |
| // we don't know anything about the types - use the generic copying |
| snippetInfo = arraycopyGenericSnippet; |
| // no need for additional type check to avoid duplicated work |
| arrayTypeCheck = ArrayCopyTypeCheck.NO_ARRAY_TYPE_CHECK; |
| } else if (srcComponentType != null && destComponentType != null) { |
| if (!srcComponentType.isPrimitive() && !destComponentType.isPrimitive()) { |
| // it depends on the array content if the copy succeeds - we need |
| // a type check for every store |
| snippetInfo = arraycopyCheckcastSnippet; |
| arrayTypeCheck = ArrayCopyTypeCheck.NO_ARRAY_TYPE_CHECK; |
| } else { |
| // one object is an object array, the other one is a primitive array. |
| // this copy will always fail - use the native call right away |
| assert !srcComponentType.equals(destComponentType) : "must be handled by arraycopy.isExact()"; |
| snippetInfo = arraycopyNativeSnippet; |
| arrayTypeCheck = ArrayCopyTypeCheck.UNDEFINED_ARRAY_TYPE_CHECK; |
| } |
| } else { |
| ResolvedJavaType nonNullComponentType = srcComponentType != null ? srcComponentType : destComponentType; |
| if (nonNullComponentType.isPrimitive()) { |
| // one involved object is a primitive array - it is sufficient to directly |
| // compare the hub. |
| snippetInfo = arraycopyExactSnippet; |
| arrayTypeCheck = ArrayCopyTypeCheck.HUB_BASED_ARRAY_TYPE_CHECK; |
| elementKind = nonNullComponentType.getJavaKind(); |
| } else { |
| // one involved object is an object array - the other array's element type |
| // may be primitive or object, hence we compare the layout helper. |
| snippetInfo = arraycopyCheckcastSnippet; |
| arrayTypeCheck = ArrayCopyTypeCheck.LAYOUT_HELPER_BASED_ARRAY_TYPE_CHECK; |
| } |
| } |
| } |
| |
| // a few special cases that are easier to handle when all other variables already have a |
| // value |
| if (snippetInfo != arraycopyNativeSnippet && snippetInfo != arraycopyGenericSnippet && arraycopy.getLength().isConstant() && arraycopy.getLength().asJavaConstant().asLong() == 0) { |
| // Copying 0 element between object arrays with conflicting types will not throw an |
| // exception - once we pass the preliminary element type checks that we are not |
| // mixing arrays of different basic types, ArrayStoreException is only thrown when |
| // an *astore would have thrown it. Therefore, copying null between object arrays |
| // with conflicting types will also succeed (we do not optimize for such case here). |
| snippetInfo = arraycopyZeroLengthSnippet; |
| } else if (snippetInfo == arraycopyExactSnippet && shouldUnroll(arraycopy.getLength())) { |
| snippetInfo = arraycopyUnrolledSnippet; |
| } |
| |
| // create the snippet |
| Arguments args = new Arguments(snippetInfo, arraycopy.graph().getGuardsStage(), tool.getLoweringStage()); |
| args.add("src", arraycopy.getSource()); |
| args.add("srcPos", arraycopy.getSourcePosition()); |
| args.add("dest", arraycopy.getDestination()); |
| args.add("destPos", arraycopy.getDestinationPosition()); |
| args.add("length", arraycopy.getLength()); |
| if (snippetInfo != arraycopyNativeSnippet) { |
| assert arrayTypeCheck != ArrayCopyTypeCheck.UNDEFINED_ARRAY_TYPE_CHECK; |
| args.addConst("arrayTypeCheck", arrayTypeCheck); |
| } |
| if (snippetInfo == arraycopyUnrolledSnippet) { |
| args.addConst("elementKind", elementKind != null ? elementKind : JavaKind.Illegal); |
| args.addConst("unrolledLength", arraycopy.getLength().asJavaConstant().asInt()); |
| } |
| if (snippetInfo == arraycopyExactSnippet) { |
| assert elementKind != null; |
| args.addConst("elementKind", elementKind); |
| args.addConst("elementKindCounter", counters.arraycopyCallCounters.get(elementKind)); |
| args.addConst("elementKindCopiedCounter", counters.arraycopyCallCopiedCounters.get(elementKind)); |
| } |
| args.addConst("counters", counters); |
| if (snippetInfo == arraycopyCheckcastSnippet) { |
| args.addConst("workSnippet", checkcastArraycopyWithSlowPathWork); |
| args.addConst("elementKind", JavaKind.Illegal); |
| } |
| if (snippetInfo == arraycopyGenericSnippet) { |
| args.addConst("workSnippet", genericArraycopyWithSlowPathWork); |
| args.addConst("elementKind", JavaKind.Illegal); |
| } |
| |
| instantiate(args, arraycopy); |
| } |
| |
| public void lower(ArrayCopyWithSlowPathNode arraycopy, LoweringTool tool) { |
| StructuredGraph graph = arraycopy.graph(); |
| if (!graph.getGuardsStage().areFrameStatesAtDeopts()) { |
| // if an arraycopy contains a slow path, we can't lower it right away |
| return; |
| } |
| |
| SnippetInfo snippetInfo = arraycopy.getSnippet(); |
| Arguments args = new Arguments(snippetInfo, graph.getGuardsStage(), tool.getLoweringStage()); |
| args.add("src", arraycopy.getSource()); |
| args.add("srcPos", arraycopy.getSourcePosition()); |
| args.add("dest", arraycopy.getDestination()); |
| args.add("destPos", arraycopy.getDestinationPosition()); |
| args.add("length", arraycopy.getLength()); |
| args.addConst("counters", counters); |
| instantiate(args, arraycopy); |
| } |
| |
| private static boolean canBeArray(ResolvedJavaType type) { |
| return type == null || type.isJavaLangObject() || type.isArray(); |
| } |
| |
| public static JavaKind selectComponentKind(BasicArrayCopyNode arraycopy) { |
| ResolvedJavaType srcType = StampTool.typeOrNull(arraycopy.getSource().stamp(NodeView.DEFAULT)); |
| ResolvedJavaType destType = StampTool.typeOrNull(arraycopy.getDestination().stamp(NodeView.DEFAULT)); |
| |
| if (srcType == null || !srcType.isArray() || destType == null || !destType.isArray()) { |
| return null; |
| } |
| if (!destType.getComponentType().isAssignableFrom(srcType.getComponentType())) { |
| return null; |
| } |
| if (!arraycopy.isExact()) { |
| return null; |
| } |
| return srcType.getComponentType().getJavaKind(); |
| } |
| |
| private static boolean shouldUnroll(ValueNode length) { |
| return length.isConstant() && length.asJavaConstant().asInt() <= 8 && length.asJavaConstant().asInt() != 0; |
| } |
| |
| /** |
| * Instantiate the snippet template and fix up the FrameState of any Invokes of |
| * System.arraycopy and propagate the captured bci in the ArrayCopySlowPathNode. |
| * |
| * @param args |
| * @param arraycopy |
| */ |
| private void instantiate(Arguments args, BasicArrayCopyNode arraycopy) { |
| StructuredGraph graph = arraycopy.graph(); |
| SnippetTemplate template = template(arraycopy, args); |
| UnmodifiableEconomicMap<Node, Node> replacements = template.instantiate(providers.getMetaAccess(), arraycopy, SnippetTemplate.DEFAULT_REPLACER, args, false); |
| for (Node originalNode : replacements.getKeys()) { |
| if (originalNode instanceof Invoke) { |
| Invoke invoke = (Invoke) replacements.get(originalNode); |
| assert invoke.asNode().graph() == graph; |
| CallTargetNode call = invoke.callTarget(); |
| |
| if (!call.targetMethod().equals(originalArraycopy)) { |
| throw new GraalError("unexpected invoke %s in snippet", call.targetMethod()); |
| } |
| // Here we need to fix the bci of the invoke |
| InvokeNode newInvoke = graph.add(new InvokeNode(invoke.callTarget(), arraycopy.getBci())); |
| if (arraycopy.stateDuring() != null) { |
| newInvoke.setStateDuring(arraycopy.stateDuring()); |
| } else { |
| assert arraycopy.stateAfter() != null : arraycopy; |
| newInvoke.setStateAfter(arraycopy.stateAfter()); |
| } |
| graph.replaceFixedWithFixed((InvokeNode) invoke.asNode(), newInvoke); |
| } else if (originalNode instanceof ArrayCopyWithSlowPathNode) { |
| ArrayCopyWithSlowPathNode slowPath = (ArrayCopyWithSlowPathNode) replacements.get(originalNode); |
| assert arraycopy.stateAfter() != null : arraycopy; |
| assert slowPath.stateAfter() == arraycopy.stateAfter(); |
| slowPath.setBci(arraycopy.getBci()); |
| } |
| } |
| GraphUtil.killCFG(arraycopy); |
| } |
| |
| private ResolvedJavaMethod originalArraycopy() throws GraalError { |
| if (originalArraycopy == null) { |
| Method method; |
| try { |
| method = System.class.getDeclaredMethod("arraycopy", Object.class, int.class, Object.class, int.class, int.class); |
| } catch (NoSuchMethodException | SecurityException e) { |
| throw new GraalError(e); |
| } |
| originalArraycopy = providers.getMetaAccess().lookupJavaMethod(method); |
| } |
| return originalArraycopy; |
| } |
| } |
| } |
