/* * Copyright (c) 2012, 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; import static org.graalvm.compiler.core.common.GraalOptions.SnippetCounters; import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfig.INJECTED_VMCONFIG; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayBaseOffset; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayIndexScale; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.cardTableShift; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.dirtyCardValue; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.g1CardQueueBufferOffset; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.g1CardQueueIndexOffset; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.g1SATBQueueBufferOffset; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.g1SATBQueueIndexOffset; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.g1SATBQueueMarkingOffset; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.g1YoungCardValue; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.registerAsWord; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.verifyOop; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.verifyOops; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.wordSize; 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.probability; import static org.graalvm.compiler.replacements.SnippetTemplate.DEFAULT_REPLACER; import static jdk.vm.ci.code.MemoryBarriers.STORE_LOAD; import org.graalvm.compiler.api.replacements.Snippet; import org.graalvm.compiler.api.replacements.Snippet.ConstantParameter; import org.graalvm.compiler.core.common.GraalOptions; import org.graalvm.compiler.core.common.LocationIdentity; import org.graalvm.compiler.core.common.spi.ForeignCallDescriptor; import org.graalvm.compiler.graph.Node.ConstantNodeParameter; import org.graalvm.compiler.graph.Node.NodeIntrinsic; import org.graalvm.compiler.hotspot.CompressEncoding; import org.graalvm.compiler.hotspot.meta.HotSpotProviders; import org.graalvm.compiler.hotspot.meta.HotSpotRegistersProvider; import org.graalvm.compiler.hotspot.nodes.CompressionNode; import org.graalvm.compiler.hotspot.nodes.G1ArrayRangePostWriteBarrier; import org.graalvm.compiler.hotspot.nodes.G1ArrayRangePreWriteBarrier; import org.graalvm.compiler.hotspot.nodes.G1PostWriteBarrier; import org.graalvm.compiler.hotspot.nodes.G1PreWriteBarrier; import org.graalvm.compiler.hotspot.nodes.G1ReferentFieldReadBarrier; import org.graalvm.compiler.hotspot.nodes.GetObjectAddressNode; import org.graalvm.compiler.hotspot.nodes.GraalHotSpotVMConfigNode; import org.graalvm.compiler.hotspot.nodes.SerialArrayRangeWriteBarrier; import org.graalvm.compiler.hotspot.nodes.SerialWriteBarrier; import org.graalvm.compiler.hotspot.nodes.type.NarrowOopStamp; import org.graalvm.compiler.nodes.NamedLocationIdentity; import org.graalvm.compiler.nodes.StructuredGraph; import org.graalvm.compiler.nodes.ValueNode; import org.graalvm.compiler.nodes.extended.FixedValueAnchorNode; import org.graalvm.compiler.nodes.extended.ForeignCallNode; import org.graalvm.compiler.nodes.extended.MembarNode; import org.graalvm.compiler.nodes.extended.NullCheckNode; import org.graalvm.compiler.nodes.memory.HeapAccess.BarrierType; import org.graalvm.compiler.nodes.memory.address.AddressNode; import org.graalvm.compiler.nodes.memory.address.AddressNode.Address; import org.graalvm.compiler.nodes.memory.address.OffsetAddressNode; import org.graalvm.compiler.nodes.spi.LoweringTool; import org.graalvm.compiler.replacements.Log; import org.graalvm.compiler.replacements.SnippetCounter; import org.graalvm.compiler.replacements.SnippetTemplate.AbstractTemplates; 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.DirectObjectStoreNode; import org.graalvm.compiler.replacements.nodes.DirectStoreNode; import org.graalvm.compiler.word.Pointer; import org.graalvm.compiler.word.Unsigned; import org.graalvm.compiler.word.Word; import jdk.vm.ci.code.Register; import jdk.vm.ci.code.TargetDescription; import jdk.vm.ci.meta.JavaKind; public class WriteBarrierSnippets implements Snippets { private static final SnippetCounter.Group countersWriteBarriers = SnippetCounters.getValue() ? new SnippetCounter.Group("WriteBarriers") : null; private static final SnippetCounter serialWriteBarrierCounter = new SnippetCounter(countersWriteBarriers, "serialWriteBarrier", "Number of Serial Write Barriers"); private static final SnippetCounter g1AttemptedPreWriteBarrierCounter = new SnippetCounter(countersWriteBarriers, "g1AttemptedPreWriteBarrier", "Number of attempted G1 Pre Write Barriers"); private static final SnippetCounter g1EffectivePreWriteBarrierCounter = new SnippetCounter(countersWriteBarriers, "g1EffectivePreWriteBarrier", "Number of effective G1 Pre Write Barriers"); private static final SnippetCounter g1ExecutedPreWriteBarrierCounter = new SnippetCounter(countersWriteBarriers, "g1ExecutedPreWriteBarrier", "Number of executed G1 Pre Write Barriers"); private static final SnippetCounter g1AttemptedPostWriteBarrierCounter = new SnippetCounter(countersWriteBarriers, "g1AttemptedPostWriteBarrier", "Number of attempted G1 Post Write Barriers"); private static final SnippetCounter g1EffectiveAfterXORPostWriteBarrierCounter = new SnippetCounter(countersWriteBarriers, "g1EffectiveAfterXORPostWriteBarrier", "Number of effective G1 Post Write Barriers (after passing the XOR test)"); private static final SnippetCounter g1EffectiveAfterNullPostWriteBarrierCounter = new SnippetCounter(countersWriteBarriers, "g1EffectiveAfterNullPostWriteBarrier", "Number of effective G1 Post Write Barriers (after passing the NULL test)"); private static final SnippetCounter g1ExecutedPostWriteBarrierCounter = new SnippetCounter(countersWriteBarriers, "g1ExecutedPostWriteBarrier", "Number of executed G1 Post Write Barriers"); public static final LocationIdentity GC_CARD_LOCATION = NamedLocationIdentity.mutable("GC-Card"); public static final LocationIdentity GC_LOG_LOCATION = NamedLocationIdentity.mutable("GC-Log"); public static final LocationIdentity GC_INDEX_LOCATION = NamedLocationIdentity.mutable("GC-Index"); private static void serialWriteBarrier(Pointer ptr) { serialWriteBarrierCounter.inc(); final long startAddress = GraalHotSpotVMConfigNode.cardTableAddress(); Word base = (Word) ptr.unsignedShiftRight(cardTableShift(INJECTED_VMCONFIG)); if (((int) startAddress) == startAddress && GraalHotSpotVMConfigNode.isCardTableAddressConstant()) { base.writeByte((int) startAddress, (byte) 0, GC_CARD_LOCATION); } else { base.writeByte(Word.unsigned(startAddress), (byte) 0, GC_CARD_LOCATION); } } @Snippet public static void serialImpreciseWriteBarrier(Object object) { serialWriteBarrier(Word.objectToTrackedPointer(object)); } @Snippet public static void serialPreciseWriteBarrier(Address address) { serialWriteBarrier(Word.fromAddress(address)); } @Snippet public static void serialArrayRangeWriteBarrier(Object object, int startIndex, int length) { if (length == 0) { return; } Object dest = FixedValueAnchorNode.getObject(object); int cardShift = cardTableShift(INJECTED_VMCONFIG); final long cardStart = GraalHotSpotVMConfigNode.cardTableAddress(); final int scale = arrayIndexScale(JavaKind.Object); int header = arrayBaseOffset(JavaKind.Object); long dstAddr = GetObjectAddressNode.get(dest); long start = (dstAddr + header + (long) startIndex * scale) >>> cardShift; long end = (dstAddr + header + ((long) startIndex + length - 1) * scale) >>> cardShift; long count = end - start + 1; while (count-- > 0) { DirectStoreNode.storeBoolean((start + cardStart) + count, false, JavaKind.Boolean); } } @Snippet public static void g1PreWriteBarrier(Address address, Object object, Object expectedObject, @ConstantParameter boolean doLoad, @ConstantParameter boolean nullCheck, @ConstantParameter Register threadRegister, @ConstantParameter boolean trace) { if (nullCheck) { NullCheckNode.nullCheck(address); } Word thread = registerAsWord(threadRegister); verifyOop(object); Object fixedExpectedObject = FixedValueAnchorNode.getObject(expectedObject); Pointer field = Word.fromAddress(address); Pointer previousOop = Word.objectToTrackedPointer(fixedExpectedObject); byte markingValue = thread.readByte(g1SATBQueueMarkingOffset(INJECTED_VMCONFIG)); int gcCycle = 0; if (trace) { gcCycle = (int) Word.unsigned(HotSpotReplacementsUtil.gcTotalCollectionsAddress(INJECTED_VMCONFIG)).readLong(0); log(trace, "[%d] G1-Pre Thread %p Object %p\n", gcCycle, thread.rawValue(), Word.objectToTrackedPointer(object).rawValue()); log(trace, "[%d] G1-Pre Thread %p Expected Object %p\n", gcCycle, thread.rawValue(), Word.objectToTrackedPointer(fixedExpectedObject).rawValue()); log(trace, "[%d] G1-Pre Thread %p Field %p\n", gcCycle, thread.rawValue(), field.rawValue()); log(trace, "[%d] G1-Pre Thread %p Marking %d\n", gcCycle, thread.rawValue(), markingValue); log(trace, "[%d] G1-Pre Thread %p DoLoad %d\n", gcCycle, thread.rawValue(), doLoad ? 1L : 0L); } g1AttemptedPreWriteBarrierCounter.inc(); // If the concurrent marker is enabled, the barrier is issued. if (probability(NOT_FREQUENT_PROBABILITY, markingValue != (byte) 0)) { // If the previous value has to be loaded (before the write), the load is issued. // The load is always issued except the cases of CAS and referent field. if (probability(LIKELY_PROBABILITY, doLoad)) { previousOop = Word.objectToTrackedPointer(field.readObject(0, BarrierType.NONE)); if (trace) { log(trace, "[%d] G1-Pre Thread %p Previous Object %p\n ", gcCycle, thread.rawValue(), previousOop.rawValue()); verifyOop(previousOop.toObject()); } } g1EffectivePreWriteBarrierCounter.inc(); // If the previous value is null the barrier should not be issued. if (probability(FREQUENT_PROBABILITY, previousOop.notEqual(0))) { g1ExecutedPreWriteBarrierCounter.inc(); // If the thread-local SATB buffer is full issue a native call which will // initialize a new one and add the entry. Word indexAddress = thread.add(g1SATBQueueIndexOffset(INJECTED_VMCONFIG)); Word indexValue = indexAddress.readWord(0); if (probability(FREQUENT_PROBABILITY, indexValue.notEqual(0))) { Word bufferAddress = thread.readWord(g1SATBQueueBufferOffset(INJECTED_VMCONFIG)); Word nextIndex = indexValue.subtract(wordSize()); Word logAddress = bufferAddress.add(nextIndex); // Log the object to be marked as well as update the SATB's buffer next index. logAddress.writeWord(0, previousOop, GC_LOG_LOCATION); indexAddress.writeWord(0, nextIndex, GC_INDEX_LOCATION); } else { g1PreBarrierStub(G1WBPRECALL, previousOop.toObject()); } } } } @Snippet public static void g1PostWriteBarrier(Address address, Object object, Object value, @ConstantParameter boolean usePrecise, @ConstantParameter Register threadRegister, @ConstantParameter boolean trace) { Word thread = registerAsWord(threadRegister); Object fixedValue = FixedValueAnchorNode.getObject(value); verifyOop(object); verifyOop(fixedValue); validateObject(object, fixedValue); Pointer oop; if (usePrecise) { oop = Word.fromAddress(address); } else { oop = Word.objectToTrackedPointer(object); } int gcCycle = 0; if (trace) { gcCycle = (int) Word.unsigned(HotSpotReplacementsUtil.gcTotalCollectionsAddress(INJECTED_VMCONFIG)).readLong(0); log(trace, "[%d] G1-Post Thread: %p Object: %p\n", gcCycle, thread.rawValue(), Word.objectToTrackedPointer(object).rawValue()); log(trace, "[%d] G1-Post Thread: %p Field: %p\n", gcCycle, thread.rawValue(), oop.rawValue()); } Pointer writtenValue = Word.objectToTrackedPointer(fixedValue); // The result of the xor reveals whether the installed pointer crosses heap regions. // In case it does the write barrier has to be issued. final int logOfHeapRegionGrainBytes = GraalHotSpotVMConfigNode.logOfHeapRegionGrainBytes(); Unsigned xorResult = (oop.xor(writtenValue)).unsignedShiftRight(logOfHeapRegionGrainBytes); // Calculate the address of the card to be enqueued to the // thread local card queue. Unsigned cardBase = oop.unsignedShiftRight(cardTableShift(INJECTED_VMCONFIG)); final long startAddress = GraalHotSpotVMConfigNode.cardTableAddress(); int displacement = 0; if (((int) startAddress) == startAddress && GraalHotSpotVMConfigNode.isCardTableAddressConstant()) { displacement = (int) startAddress; } else { cardBase = cardBase.add(Word.unsigned(startAddress)); } Word cardAddress = (Word) cardBase.add(displacement); g1AttemptedPostWriteBarrierCounter.inc(); if (probability(FREQUENT_PROBABILITY, xorResult.notEqual(0))) { g1EffectiveAfterXORPostWriteBarrierCounter.inc(); // If the written value is not null continue with the barrier addition. if (probability(FREQUENT_PROBABILITY, writtenValue.notEqual(0))) { byte cardByte = cardAddress.readByte(0, GC_CARD_LOCATION); g1EffectiveAfterNullPostWriteBarrierCounter.inc(); // If the card is already dirty, (hence already enqueued) skip the insertion. if (probability(NOT_FREQUENT_PROBABILITY, cardByte != g1YoungCardValue(INJECTED_VMCONFIG))) { MembarNode.memoryBarrier(STORE_LOAD, GC_CARD_LOCATION); byte cardByteReload = cardAddress.readByte(0, GC_CARD_LOCATION); if (probability(NOT_FREQUENT_PROBABILITY, cardByteReload != dirtyCardValue(INJECTED_VMCONFIG))) { log(trace, "[%d] G1-Post Thread: %p Card: %p \n", gcCycle, thread.rawValue(), Word.unsigned(cardByte).rawValue()); cardAddress.writeByte(0, (byte) 0, GC_CARD_LOCATION); g1ExecutedPostWriteBarrierCounter.inc(); // If the thread local card queue is full, issue a native call which will // initialize a new one and add the card entry. Word indexAddress = thread.add(g1CardQueueIndexOffset(INJECTED_VMCONFIG)); Word indexValue = thread.readWord(g1CardQueueIndexOffset(INJECTED_VMCONFIG)); if (probability(FREQUENT_PROBABILITY, indexValue.notEqual(0))) { Word bufferAddress = thread.readWord(g1CardQueueBufferOffset(INJECTED_VMCONFIG)); Word nextIndex = indexValue.subtract(wordSize()); Word logAddress = bufferAddress.add(nextIndex); // Log the object to be scanned as well as update // the card queue's next index. logAddress.writeWord(0, cardAddress, GC_LOG_LOCATION); indexAddress.writeWord(0, nextIndex, GC_INDEX_LOCATION); } else { g1PostBarrierStub(G1WBPOSTCALL, cardAddress); } } } } } } @Snippet public static void g1ArrayRangePreWriteBarrier(Object object, int startIndex, int length, @ConstantParameter Register threadRegister) { Word thread = registerAsWord(threadRegister); byte markingValue = thread.readByte(g1SATBQueueMarkingOffset(INJECTED_VMCONFIG)); // If the concurrent marker is not enabled or the vector length is zero, return. if (markingValue == (byte) 0 || length == 0) { return; } Object dest = FixedValueAnchorNode.getObject(object); Word bufferAddress = thread.readWord(g1SATBQueueBufferOffset(INJECTED_VMCONFIG)); Word indexAddress = thread.add(g1SATBQueueIndexOffset(INJECTED_VMCONFIG)); long dstAddr = GetObjectAddressNode.get(dest); long indexValue = indexAddress.readWord(0).rawValue(); final int scale = arrayIndexScale(JavaKind.Object); int header = arrayBaseOffset(JavaKind.Object); for (int i = startIndex; i < length; i++) { long address = dstAddr + header + (i * scale); Pointer oop = Word.objectToTrackedPointer(Word.unsigned(address).readObject(0, BarrierType.NONE)); verifyOop(oop.toObject()); if (oop.notEqual(0)) { if (indexValue != 0) { indexValue = indexValue - wordSize(); Word logAddress = bufferAddress.add(Word.unsigned(indexValue)); // Log the object to be marked as well as update the SATB's buffer next index. logAddress.writeWord(0, oop, GC_LOG_LOCATION); indexAddress.writeWord(0, Word.unsigned(indexValue), GC_INDEX_LOCATION); } else { g1PreBarrierStub(G1WBPRECALL, oop.toObject()); } } } } @Snippet public static void g1ArrayRangePostWriteBarrier(Object object, int startIndex, int length, @ConstantParameter Register threadRegister) { if (length == 0) { return; } Object dest = FixedValueAnchorNode.getObject(object); Word thread = registerAsWord(threadRegister); Word bufferAddress = thread.readWord(g1CardQueueBufferOffset(INJECTED_VMCONFIG)); Word indexAddress = thread.add(g1CardQueueIndexOffset(INJECTED_VMCONFIG)); long indexValue = thread.readWord(g1CardQueueIndexOffset(INJECTED_VMCONFIG)).rawValue(); int cardShift = cardTableShift(INJECTED_VMCONFIG); final long cardStart = GraalHotSpotVMConfigNode.cardTableAddress(); final int scale = arrayIndexScale(JavaKind.Object); int header = arrayBaseOffset(JavaKind.Object); long dstAddr = GetObjectAddressNode.get(dest); long start = (dstAddr + header + (long) startIndex * scale) >>> cardShift; long end = (dstAddr + header + ((long) startIndex + length - 1) * scale) >>> cardShift; long count = end - start + 1; while (count-- > 0) { Word cardAddress = Word.unsigned((start + cardStart) + count); byte cardByte = cardAddress.readByte(0, GC_CARD_LOCATION); // If the card is already dirty, (hence already enqueued) skip the insertion. if (probability(NOT_FREQUENT_PROBABILITY, cardByte != g1YoungCardValue(INJECTED_VMCONFIG))) { MembarNode.memoryBarrier(STORE_LOAD, GC_CARD_LOCATION); byte cardByteReload = cardAddress.readByte(0, GC_CARD_LOCATION); if (probability(NOT_FREQUENT_PROBABILITY, cardByteReload != dirtyCardValue(INJECTED_VMCONFIG))) { cardAddress.writeByte(0, (byte) 0, GC_CARD_LOCATION); // If the thread local card queue is full, issue a native call which will // initialize a new one and add the card entry. if (indexValue != 0) { indexValue = indexValue - wordSize(); Word logAddress = bufferAddress.add(Word.unsigned(indexValue)); // Log the object to be scanned as well as update // the card queue's next index. logAddress.writeWord(0, cardAddress, GC_LOG_LOCATION); indexAddress.writeWord(0, Word.unsigned(indexValue), GC_INDEX_LOCATION); } else { g1PostBarrierStub(G1WBPOSTCALL, cardAddress); } } } } } public static final ForeignCallDescriptor G1WBPRECALL = new ForeignCallDescriptor("write_barrier_pre", void.class, Object.class); @NodeIntrinsic(ForeignCallNode.class) private static native void g1PreBarrierStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Object object); public static final ForeignCallDescriptor G1WBPOSTCALL = new ForeignCallDescriptor("write_barrier_post", void.class, Word.class); @NodeIntrinsic(ForeignCallNode.class) public static native void g1PostBarrierStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word card); public static class Templates extends AbstractTemplates { private final SnippetInfo serialImpreciseWriteBarrier = snippet(WriteBarrierSnippets.class, "serialImpreciseWriteBarrier", GC_CARD_LOCATION); private final SnippetInfo serialPreciseWriteBarrier = snippet(WriteBarrierSnippets.class, "serialPreciseWriteBarrier", GC_CARD_LOCATION); private final SnippetInfo serialArrayRangeWriteBarrier = snippet(WriteBarrierSnippets.class, "serialArrayRangeWriteBarrier"); private final SnippetInfo g1PreWriteBarrier = snippet(WriteBarrierSnippets.class, "g1PreWriteBarrier", GC_INDEX_LOCATION, GC_LOG_LOCATION); private final SnippetInfo g1ReferentReadBarrier = snippet(WriteBarrierSnippets.class, "g1PreWriteBarrier", GC_INDEX_LOCATION, GC_LOG_LOCATION); private final SnippetInfo g1PostWriteBarrier = snippet(WriteBarrierSnippets.class, "g1PostWriteBarrier", GC_CARD_LOCATION, GC_INDEX_LOCATION, GC_LOG_LOCATION); private final SnippetInfo g1ArrayRangePreWriteBarrier = snippet(WriteBarrierSnippets.class, "g1ArrayRangePreWriteBarrier", GC_INDEX_LOCATION, GC_LOG_LOCATION); private final SnippetInfo g1ArrayRangePostWriteBarrier = snippet(WriteBarrierSnippets.class, "g1ArrayRangePostWriteBarrier", GC_CARD_LOCATION, GC_INDEX_LOCATION, GC_LOG_LOCATION); private final CompressEncoding oopEncoding; public Templates(HotSpotProviders providers, TargetDescription target, CompressEncoding oopEncoding) { super(providers, providers.getSnippetReflection(), target); this.oopEncoding = oopEncoding; } public void lower(SerialWriteBarrier writeBarrier, LoweringTool tool) { Arguments args; if (writeBarrier.usePrecise()) { args = new Arguments(serialPreciseWriteBarrier, writeBarrier.graph().getGuardsStage(), tool.getLoweringStage()); args.add("address", writeBarrier.getAddress()); } else { args = new Arguments(serialImpreciseWriteBarrier, writeBarrier.graph().getGuardsStage(), tool.getLoweringStage()); OffsetAddressNode address = (OffsetAddressNode) writeBarrier.getAddress(); args.add("object", address.getBase()); } template(args).instantiate(providers.getMetaAccess(), writeBarrier, DEFAULT_REPLACER, args); } public void lower(SerialArrayRangeWriteBarrier arrayRangeWriteBarrier, LoweringTool tool) { Arguments args = new Arguments(serialArrayRangeWriteBarrier, arrayRangeWriteBarrier.graph().getGuardsStage(), tool.getLoweringStage()); args.add("object", arrayRangeWriteBarrier.getObject()); args.add("startIndex", arrayRangeWriteBarrier.getStartIndex()); args.add("length", arrayRangeWriteBarrier.getLength()); template(args).instantiate(providers.getMetaAccess(), arrayRangeWriteBarrier, DEFAULT_REPLACER, args); } public void lower(G1PreWriteBarrier writeBarrierPre, HotSpotRegistersProvider registers, LoweringTool tool) { Arguments args = new Arguments(g1PreWriteBarrier, writeBarrierPre.graph().getGuardsStage(), tool.getLoweringStage()); AddressNode address = writeBarrierPre.getAddress(); args.add("address", address); if (address instanceof OffsetAddressNode) { args.add("object", ((OffsetAddressNode) address).getBase()); } else { args.add("object", null); } ValueNode expected = writeBarrierPre.getExpectedObject(); if (expected != null && expected.stamp() instanceof NarrowOopStamp) { assert oopEncoding != null; expected = CompressionNode.uncompress(expected, oopEncoding); } args.add("expectedObject", expected); args.addConst("doLoad", writeBarrierPre.doLoad()); args.addConst("nullCheck", writeBarrierPre.getNullCheck()); args.addConst("threadRegister", registers.getThreadRegister()); args.addConst("trace", traceBarrier()); template(args).instantiate(providers.getMetaAccess(), writeBarrierPre, DEFAULT_REPLACER, args); } public void lower(G1ReferentFieldReadBarrier readBarrier, HotSpotRegistersProvider registers, LoweringTool tool) { Arguments args = new Arguments(g1ReferentReadBarrier, readBarrier.graph().getGuardsStage(), tool.getLoweringStage()); AddressNode address = readBarrier.getAddress(); args.add("address", address); if (address instanceof OffsetAddressNode) { args.add("object", ((OffsetAddressNode) address).getBase()); } else { args.add("object", null); } ValueNode expected = readBarrier.getExpectedObject(); if (expected != null && expected.stamp() instanceof NarrowOopStamp) { assert oopEncoding != null; expected = CompressionNode.uncompress(expected, oopEncoding); } args.add("expectedObject", expected); args.addConst("doLoad", readBarrier.doLoad()); args.addConst("nullCheck", false); args.addConst("threadRegister", registers.getThreadRegister()); args.addConst("trace", traceBarrier()); template(args).instantiate(providers.getMetaAccess(), readBarrier, DEFAULT_REPLACER, args); } public void lower(G1PostWriteBarrier writeBarrierPost, HotSpotRegistersProvider registers, LoweringTool tool) { StructuredGraph graph = writeBarrierPost.graph(); if (writeBarrierPost.alwaysNull()) { graph.removeFixed(writeBarrierPost); return; } Arguments args = new Arguments(g1PostWriteBarrier, graph.getGuardsStage(), tool.getLoweringStage()); AddressNode address = writeBarrierPost.getAddress(); args.add("address", address); if (address instanceof OffsetAddressNode) { args.add("object", ((OffsetAddressNode) address).getBase()); } else { assert writeBarrierPost.usePrecise() : "found imprecise barrier that's not an object access " + writeBarrierPost; args.add("object", null); } ValueNode value = writeBarrierPost.getValue(); if (value.stamp() instanceof NarrowOopStamp) { assert oopEncoding != null; value = CompressionNode.uncompress(value, oopEncoding); } args.add("value", value); args.addConst("usePrecise", writeBarrierPost.usePrecise()); args.addConst("threadRegister", registers.getThreadRegister()); args.addConst("trace", traceBarrier()); template(args).instantiate(providers.getMetaAccess(), writeBarrierPost, DEFAULT_REPLACER, args); } public void lower(G1ArrayRangePreWriteBarrier arrayRangeWriteBarrier, HotSpotRegistersProvider registers, LoweringTool tool) { Arguments args = new Arguments(g1ArrayRangePreWriteBarrier, arrayRangeWriteBarrier.graph().getGuardsStage(), tool.getLoweringStage()); args.add("object", arrayRangeWriteBarrier.getObject()); args.add("startIndex", arrayRangeWriteBarrier.getStartIndex()); args.add("length", arrayRangeWriteBarrier.getLength()); args.addConst("threadRegister", registers.getThreadRegister()); template(args).instantiate(providers.getMetaAccess(), arrayRangeWriteBarrier, DEFAULT_REPLACER, args); } public void lower(G1ArrayRangePostWriteBarrier arrayRangeWriteBarrier, HotSpotRegistersProvider registers, LoweringTool tool) { Arguments args = new Arguments(g1ArrayRangePostWriteBarrier, arrayRangeWriteBarrier.graph().getGuardsStage(), tool.getLoweringStage()); args.add("object", arrayRangeWriteBarrier.getObject()); args.add("startIndex", arrayRangeWriteBarrier.getStartIndex()); args.add("length", arrayRangeWriteBarrier.getLength()); args.addConst("threadRegister", registers.getThreadRegister()); template(args).instantiate(providers.getMetaAccess(), arrayRangeWriteBarrier, DEFAULT_REPLACER, args); } } /** * Log method of debugging purposes. */ public static void log(boolean enabled, String format, long value) { if (enabled) { Log.printf(format, value); } } public static void log(boolean enabled, String format, long value1, long value2) { if (enabled) { Log.printf(format, value1, value2); } } public static void log(boolean enabled, String format, long value1, long value2, long value3) { if (enabled) { Log.printf(format, value1, value2, value3); } } public static boolean traceBarrier() { return GraalOptions.GCDebugStartCycle.getValue() > 0 && ((int) Word.unsigned(HotSpotReplacementsUtil.gcTotalCollectionsAddress(INJECTED_VMCONFIG)).readLong(0) > GraalOptions.GCDebugStartCycle.getValue()); } /** * Validation helper method which performs sanity checks on write operations. The addresses of * both the object and the value being written are checked in order to determine if they reside * in a valid heap region. If an object is stale, an invalid access is performed in order to * prematurely crash the VM and debug the stack trace of the faulty method. */ public static void validateObject(Object parent, Object child) { if (verifyOops(INJECTED_VMCONFIG) && child != null && !validateOop(VALIDATE_OBJECT, parent, child)) { log(true, "Verification ERROR, Parent: %p Child: %p\n", Word.objectToTrackedPointer(parent).rawValue(), Word.objectToTrackedPointer(child).rawValue()); DirectObjectStoreNode.storeObject(null, 0, 0, null, LocationIdentity.any(), JavaKind.Object); } } public static final ForeignCallDescriptor VALIDATE_OBJECT = new ForeignCallDescriptor("validate_object", boolean.class, Word.class, Word.class); @NodeIntrinsic(ForeignCallNode.class) private static native boolean validateOop(@ConstantNodeParameter ForeignCallDescriptor descriptor, Object parent, Object object); }