/* * 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.GeneratePIC; import static org.graalvm.compiler.core.common.GraalOptions.SnippetCounters; import static org.graalvm.compiler.core.common.calc.UnsignedMath.belowThan; import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfig.INJECTED_VMCONFIG; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.CLASS_ARRAY_KLASS_LOCATION; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.HUB_WRITE_LOCATION; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.MARK_WORD_LOCATION; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.PROTOTYPE_MARK_WORD_LOCATION; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.TLAB_END_LOCATION; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.TLAB_TOP_LOCATION; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayKlassOffset; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayLengthOffset; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.config; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.initializeObjectHeader; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.instanceHeaderSize; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.isInstanceKlassFullyInitialized; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.layoutHelperHeaderSizeMask; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.layoutHelperHeaderSizeShift; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.layoutHelperLog2ElementSizeMask; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.layoutHelperLog2ElementSizeShift; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.loadKlassFromObject; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.prototypeMarkWordOffset; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.readLayoutHelper; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.readTlabEnd; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.readTlabTop; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.registerAsWord; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.useBiasedLocking; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.useTLAB; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.verifyOop; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.wordSize; import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.writeTlabTop; import static org.graalvm.compiler.nodes.PiArrayNode.piArrayCast; import static org.graalvm.compiler.nodes.PiNode.piCast; import static org.graalvm.compiler.nodes.extended.BranchProbabilityNode.FAST_PATH_PROBABILITY; import static org.graalvm.compiler.nodes.extended.BranchProbabilityNode.FREQUENT_PROBABILITY; import static org.graalvm.compiler.nodes.extended.BranchProbabilityNode.SLOW_PATH_PROBABILITY; import static org.graalvm.compiler.nodes.extended.BranchProbabilityNode.probability; import static org.graalvm.compiler.replacements.ReplacementsUtil.REPLACEMENTS_ASSERTIONS_ENABLED; import static org.graalvm.compiler.replacements.ReplacementsUtil.staticAssert; import static org.graalvm.compiler.replacements.SnippetTemplate.DEFAULT_REPLACER; import static org.graalvm.compiler.replacements.nodes.CStringConstant.cstring; import static org.graalvm.compiler.replacements.nodes.ExplodeLoopNode.explodeLoop; import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntimeProvider.getArrayBaseOffset; import static jdk.vm.ci.hotspot.HotSpotMetaAccessProvider.computeArrayAllocationSize; 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.api.replacements.Snippet.VarargsParameter; import org.graalvm.compiler.core.common.LocationIdentity; import org.graalvm.compiler.core.common.spi.ForeignCallDescriptor; import org.graalvm.compiler.core.common.type.StampFactory; import org.graalvm.compiler.debug.Debug; import org.graalvm.compiler.debug.GraalError; import org.graalvm.compiler.graph.Node.ConstantNodeParameter; import org.graalvm.compiler.graph.Node.NodeIntrinsic; import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig; import org.graalvm.compiler.hotspot.HotSpotBackend; import org.graalvm.compiler.hotspot.meta.HotSpotProviders; import org.graalvm.compiler.hotspot.meta.HotSpotRegistersProvider; import org.graalvm.compiler.hotspot.nodes.DimensionsNode; import org.graalvm.compiler.hotspot.nodes.aot.LoadConstantIndirectlyFixedNode; import org.graalvm.compiler.hotspot.nodes.aot.LoadConstantIndirectlyNode; import org.graalvm.compiler.hotspot.nodes.type.KlassPointerStamp; import org.graalvm.compiler.hotspot.replacements.aot.ResolveConstantSnippets; import org.graalvm.compiler.hotspot.word.KlassPointer; import org.graalvm.compiler.nodes.ConstantNode; import org.graalvm.compiler.nodes.DeoptimizeNode; import org.graalvm.compiler.nodes.NamedLocationIdentity; import org.graalvm.compiler.nodes.PrefetchAllocateNode; import org.graalvm.compiler.nodes.StructuredGraph; import org.graalvm.compiler.nodes.ValueNode; import org.graalvm.compiler.nodes.debug.DynamicCounterNode; import org.graalvm.compiler.nodes.debug.VerifyHeapNode; import org.graalvm.compiler.nodes.extended.BranchProbabilityNode; import org.graalvm.compiler.nodes.extended.ForeignCallNode; import org.graalvm.compiler.nodes.extended.MembarNode; import org.graalvm.compiler.nodes.java.DynamicNewArrayNode; import org.graalvm.compiler.nodes.java.DynamicNewInstanceNode; import org.graalvm.compiler.nodes.java.NewArrayNode; import org.graalvm.compiler.nodes.java.NewInstanceNode; import org.graalvm.compiler.nodes.java.NewMultiArrayNode; import org.graalvm.compiler.nodes.memory.address.OffsetAddressNode; import org.graalvm.compiler.nodes.spi.LoweringTool; import org.graalvm.compiler.nodes.util.GraphUtil; import org.graalvm.compiler.replacements.ReplacementsUtil; import org.graalvm.compiler.replacements.SnippetCounter; import org.graalvm.compiler.replacements.SnippetTemplate; 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.ExplodeLoopNode; import org.graalvm.compiler.word.Word; import jdk.vm.ci.code.CodeUtil; import jdk.vm.ci.code.MemoryBarriers; import jdk.vm.ci.code.Register; import jdk.vm.ci.code.TargetDescription; import jdk.vm.ci.hotspot.HotSpotJVMCIRuntimeProvider; import jdk.vm.ci.hotspot.HotSpotResolvedObjectType; import jdk.vm.ci.meta.DeoptimizationAction; import jdk.vm.ci.meta.DeoptimizationReason; import jdk.vm.ci.meta.JavaKind; import jdk.vm.ci.meta.ResolvedJavaType; /** * Snippets used for implementing NEW, ANEWARRAY and NEWARRAY. */ public class NewObjectSnippets implements Snippets { public static final LocationIdentity INIT_LOCATION = NamedLocationIdentity.mutable("Initialization"); enum ProfileContext { AllocatingMethod, InstanceOrArray, AllocatedType, AllocatedTypesInMethod, Total } @Fold static String createName(String path, String typeContext) { switch (HotspotSnippetsOptions.ProfileAllocationsContext.getValue()) { case AllocatingMethod: return ""; case InstanceOrArray: return path; case AllocatedType: case AllocatedTypesInMethod: return typeContext; case Total: return "bytes"; default: throw GraalError.shouldNotReachHere(); } } @Fold static boolean doProfile() { return HotspotSnippetsOptions.ProfileAllocations.getValue(); } @Fold static boolean withContext() { ProfileContext context = HotspotSnippetsOptions.ProfileAllocationsContext.getValue(); return context == ProfileContext.AllocatingMethod || context == ProfileContext.AllocatedTypesInMethod; } protected static void profileAllocation(String path, long size, String typeContext) { if (doProfile()) { String name = createName(path, typeContext); boolean context = withContext(); DynamicCounterNode.counter(name, "number of bytes allocated", size, context); DynamicCounterNode.counter(name, "number of allocations", 1, context); } } public static void emitPrefetchAllocate(Word address, boolean isArray) { GraalHotSpotVMConfig config = config(INJECTED_VMCONFIG); if (config.allocatePrefetchStyle > 0) { // Insert a prefetch for each allocation only on the fast-path // Generate several prefetch instructions. int lines = isArray ? config.allocatePrefetchLines : config.allocateInstancePrefetchLines; int stepSize = config.allocatePrefetchStepSize; int distance = config.allocatePrefetchDistance; ExplodeLoopNode.explodeLoop(); for (int i = 0; i < lines; i++) { PrefetchAllocateNode.prefetch(OffsetAddressNode.address(address, distance)); distance += stepSize; } } } @Snippet public static Object allocateInstance(@ConstantParameter int size, KlassPointer hub, Word prototypeMarkWord, @ConstantParameter boolean fillContents, @ConstantParameter Register threadRegister, @ConstantParameter boolean constantSize, @ConstantParameter String typeContext) { Object result; Word thread = registerAsWord(threadRegister); Word top = readTlabTop(thread); Word end = readTlabEnd(thread); Word newTop = top.add(size); if (useTLAB(INJECTED_VMCONFIG) && probability(FAST_PATH_PROBABILITY, newTop.belowOrEqual(end))) { writeTlabTop(thread, newTop); emitPrefetchAllocate(newTop, false); result = formatObject(hub, size, top, prototypeMarkWord, fillContents, constantSize, true); } else { new_stub.inc(); result = newInstance(HotSpotBackend.NEW_INSTANCE, hub); } profileAllocation("instance", size, typeContext); return piCast(verifyOop(result), StampFactory.forNodeIntrinsic()); } @NodeIntrinsic(value = ForeignCallNode.class, returnStampIsNonNull = true) public static native Object newInstance(@ConstantNodeParameter ForeignCallDescriptor descriptor, KlassPointer hub); @Snippet public static Object allocateInstancePIC(@ConstantParameter int size, KlassPointer hub, Word prototypeMarkWord, @ConstantParameter boolean fillContents, @ConstantParameter Register threadRegister, @ConstantParameter boolean constantSize, @ConstantParameter String typeContext) { // Klass must be initialized by the time the first instance is allocated, therefore we can // just load it from the corresponding cell and avoid the resolution check. We have to use a // fixed load though, to prevent it from floating above the initialization. KlassPointer picHub = LoadConstantIndirectlyFixedNode.loadKlass(hub); return allocateInstance(size, picHub, prototypeMarkWord, fillContents, threadRegister, constantSize, typeContext); } @Snippet public static Object allocateInstanceDynamic(Class type, Class classClass, @ConstantParameter boolean fillContents, @ConstantParameter Register threadRegister) { if (probability(SLOW_PATH_PROBABILITY, type == null || DynamicNewInstanceNode.throwsInstantiationException(type, classClass))) { DeoptimizeNode.deopt(DeoptimizationAction.None, DeoptimizationReason.RuntimeConstraint); } KlassPointer hub = ClassGetHubNode.readClass(type); if (probability(FAST_PATH_PROBABILITY, !hub.isNull())) { if (probability(FAST_PATH_PROBABILITY, isInstanceKlassFullyInitialized(hub))) { int layoutHelper = readLayoutHelper(hub); /* * src/share/vm/oops/klass.hpp: For instances, layout helper is a positive number, * the instance size. This size is already passed through align_object_size and * scaled to bytes. The low order bit is set if instances of this class cannot be * allocated using the fastpath. */ if (probability(FAST_PATH_PROBABILITY, (layoutHelper & 1) == 0)) { Word prototypeMarkWord = hub.readWord(prototypeMarkWordOffset(INJECTED_VMCONFIG), PROTOTYPE_MARK_WORD_LOCATION); /* * FIXME(je,ds): we should actually pass typeContext instead of "" but late * binding of parameters is not yet supported by the GraphBuilderPlugin system. */ return allocateInstance(layoutHelper, hub, prototypeMarkWord, fillContents, threadRegister, false, ""); } } } return dynamicNewInstanceStub(type); } /** * Maximum array length for which fast path allocation is used. */ public static final int MAX_ARRAY_FAST_PATH_ALLOCATION_LENGTH = 0x00FFFFFF; @Snippet public static Object allocatePrimitiveArrayPIC(KlassPointer hub, int length, Word prototypeMarkWord, @ConstantParameter int headerSize, @ConstantParameter int log2ElementSize, @ConstantParameter boolean fillContents, @ConstantParameter Register threadRegister, @ConstantParameter boolean maybeUnroll, @ConstantParameter String typeContext) { KlassPointer picHub = LoadConstantIndirectlyNode.loadKlass(hub); return allocateArrayImpl(picHub, length, prototypeMarkWord, headerSize, log2ElementSize, fillContents, threadRegister, maybeUnroll, typeContext, false); } @Snippet public static Object allocateArrayPIC(KlassPointer hub, int length, Word prototypeMarkWord, @ConstantParameter int headerSize, @ConstantParameter int log2ElementSize, @ConstantParameter boolean fillContents, @ConstantParameter Register threadRegister, @ConstantParameter boolean maybeUnroll, @ConstantParameter String typeContext) { KlassPointer picHub = ResolveConstantSnippets.resolveKlassConstant(hub); return allocateArrayImpl(picHub, length, prototypeMarkWord, headerSize, log2ElementSize, fillContents, threadRegister, maybeUnroll, typeContext, false); } @Snippet public static Object allocateArray(KlassPointer hub, int length, Word prototypeMarkWord, @ConstantParameter int headerSize, @ConstantParameter int log2ElementSize, @ConstantParameter boolean fillContents, @ConstantParameter Register threadRegister, @ConstantParameter boolean maybeUnroll, @ConstantParameter String typeContext) { Object result = allocateArrayImpl(hub, length, prototypeMarkWord, headerSize, log2ElementSize, fillContents, threadRegister, maybeUnroll, typeContext, false); return piArrayCast(verifyOop(result), length, StampFactory.forNodeIntrinsic()); } private static Object allocateArrayImpl(KlassPointer hub, int length, Word prototypeMarkWord, int headerSize, int log2ElementSize, boolean fillContents, @ConstantParameter Register threadRegister, @ConstantParameter boolean maybeUnroll, String typeContext, boolean skipNegativeCheck) { Object result; int alignment = wordSize(); int allocationSize = computeArrayAllocationSize(length, alignment, headerSize, log2ElementSize); Word thread = registerAsWord(threadRegister); Word top = readTlabTop(thread); Word end = readTlabEnd(thread); Word newTop = top.add(allocationSize); if (probability(FREQUENT_PROBABILITY, skipNegativeCheck || belowThan(length, MAX_ARRAY_FAST_PATH_ALLOCATION_LENGTH)) && useTLAB(INJECTED_VMCONFIG) && probability(FAST_PATH_PROBABILITY, newTop.belowOrEqual(end))) { writeTlabTop(thread, newTop); emitPrefetchAllocate(newTop, true); newarray_loopInit.inc(); result = formatArray(hub, allocationSize, length, headerSize, top, prototypeMarkWord, fillContents, maybeUnroll, true); } else { result = newArray(HotSpotBackend.NEW_ARRAY, hub, length, fillContents); } profileAllocation("array", allocationSize, typeContext); return result; } @NodeIntrinsic(value = ForeignCallNode.class, returnStampIsNonNull = true) public static native Object newArray(@ConstantNodeParameter ForeignCallDescriptor descriptor, KlassPointer hub, int length, boolean fillContents); public static final ForeignCallDescriptor DYNAMIC_NEW_ARRAY = new ForeignCallDescriptor("dynamic_new_array", Object.class, Class.class, int.class); public static final ForeignCallDescriptor DYNAMIC_NEW_INSTANCE = new ForeignCallDescriptor("dynamic_new_instance", Object.class, Class.class); @NodeIntrinsic(value = ForeignCallNode.class, returnStampIsNonNull = true) public static native Object dynamicNewArrayStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Class elementType, int length); public static Object dynamicNewInstanceStub(Class elementType) { return dynamicNewInstanceStubCall(DYNAMIC_NEW_INSTANCE, elementType); } @NodeIntrinsic(value = ForeignCallNode.class, returnStampIsNonNull = true) public static native Object dynamicNewInstanceStubCall(@ConstantNodeParameter ForeignCallDescriptor descriptor, Class elementType); @Snippet public static Object allocateArrayDynamic(Class elementType, Class voidClass, int length, @ConstantParameter boolean fillContents, @ConstantParameter Register threadRegister, @ConstantParameter JavaKind knownElementKind, @ConstantParameter int knownLayoutHelper, Word prototypeMarkWord) { Object result = allocateArrayDynamicImpl(elementType, voidClass, length, fillContents, threadRegister, knownElementKind, knownLayoutHelper, prototypeMarkWord); return result; } private static Object allocateArrayDynamicImpl(Class elementType, Class voidClass, int length, boolean fillContents, Register threadRegister, JavaKind knownElementKind, int knownLayoutHelper, Word prototypeMarkWord) { /* * We only need the dynamic check for void when we have no static information from * knownElementKind. */ staticAssert(knownElementKind != JavaKind.Void, "unsupported knownElementKind"); if (knownElementKind == JavaKind.Illegal && probability(SLOW_PATH_PROBABILITY, elementType == null || DynamicNewArrayNode.throwsIllegalArgumentException(elementType, voidClass))) { DeoptimizeNode.deopt(DeoptimizationAction.None, DeoptimizationReason.RuntimeConstraint); } KlassPointer klass = loadKlassFromObject(elementType, arrayKlassOffset(INJECTED_VMCONFIG), CLASS_ARRAY_KLASS_LOCATION); if (probability(BranchProbabilityNode.NOT_FREQUENT_PROBABILITY, klass.isNull() || length < 0)) { DeoptimizeNode.deopt(DeoptimizationAction.None, DeoptimizationReason.RuntimeConstraint); } int layoutHelper = knownElementKind != JavaKind.Illegal ? knownLayoutHelper : readLayoutHelper(klass); //@formatter:off // from src/share/vm/oops/klass.hpp: // // For arrays, layout helper is a negative number, containing four // distinct bytes, as follows: // MSB:[tag, hsz, ebt, log2(esz)]:LSB // where: // tag is 0x80 if the elements are oops, 0xC0 if non-oops // hsz is array header size in bytes (i.e., offset of first element) // ebt is the BasicType of the elements // esz is the element size in bytes //@formatter:on int headerSize = (layoutHelper >> layoutHelperHeaderSizeShift(INJECTED_VMCONFIG)) & layoutHelperHeaderSizeMask(INJECTED_VMCONFIG); int log2ElementSize = (layoutHelper >> layoutHelperLog2ElementSizeShift(INJECTED_VMCONFIG)) & layoutHelperLog2ElementSizeMask(INJECTED_VMCONFIG); Object result = allocateArrayImpl(klass, length, prototypeMarkWord, headerSize, log2ElementSize, fillContents, threadRegister, false, "dynamic type", true); return piArrayCast(verifyOop(result), length, StampFactory.forNodeIntrinsic()); } /** * Calls the runtime stub for implementing MULTIANEWARRAY. */ @Snippet public static Object newmultiarray(KlassPointer hub, @ConstantParameter int rank, @VarargsParameter int[] dimensions) { Word dims = DimensionsNode.allocaDimsArray(rank); ExplodeLoopNode.explodeLoop(); for (int i = 0; i < rank; i++) { dims.writeInt(i * 4, dimensions[i], INIT_LOCATION); } return newArrayCall(HotSpotBackend.NEW_MULTI_ARRAY, hub, rank, dims); } @Snippet public static Object newmultiarrayPIC(KlassPointer hub, @ConstantParameter int rank, @VarargsParameter int[] dimensions) { KlassPointer hubPIC = ResolveConstantSnippets.resolveKlassConstant(hub); return newmultiarray(hubPIC, rank, dimensions); } @NodeIntrinsic(value = ForeignCallNode.class, returnStampIsNonNull = true) public static native Object newArrayCall(@ConstantNodeParameter ForeignCallDescriptor descriptor, KlassPointer hub, int rank, Word dims); /** * Maximum number of long stores to emit when zeroing an object with a constant size. Larger * objects have their bodies initialized in a loop. */ private static final int MAX_UNROLLED_OBJECT_ZEROING_STORES = 8; /** * Zero uninitialized memory in a newly allocated object, unrolling as necessary and ensuring * that stores are aligned. * * @param size number of bytes to zero * @param memory beginning of object which is being zeroed * @param constantSize is {@code size} known to be constant in the snippet * @param startOffset offset to begin zeroing. May not be word aligned. * @param manualUnroll maximally unroll zeroing */ private static void zeroMemory(int size, Word memory, boolean constantSize, int startOffset, boolean manualUnroll, boolean useSnippetCounters) { fillMemory(0, size, memory, constantSize, startOffset, manualUnroll, useSnippetCounters); } private static void fillMemory(long value, int size, Word memory, boolean constantSize, int startOffset, boolean manualUnroll, boolean useSnippetCounters) { ReplacementsUtil.runtimeAssert((size & 0x7) == 0, "unaligned object size"); int offset = startOffset; if ((offset & 0x7) != 0) { memory.writeInt(offset, (int) value, INIT_LOCATION); offset += 4; } ReplacementsUtil.runtimeAssert((offset & 0x7) == 0, "unaligned offset"); if (manualUnroll && ((size - offset) / 8) <= MAX_UNROLLED_OBJECT_ZEROING_STORES) { ReplacementsUtil.staticAssert(!constantSize, "size shouldn't be constant at instantiation time"); // This case handles arrays of constant length. Instead of having a snippet variant for // each length, generate a chain of stores of maximum length. Once it's inlined the // break statement will trim excess stores. if (useSnippetCounters) { new_seqInit.inc(); } explodeLoop(); for (int i = 0; i < MAX_UNROLLED_OBJECT_ZEROING_STORES; i++, offset += 8) { if (offset == size) { break; } memory.initializeLong(offset, value, INIT_LOCATION); } } else { // Use Word instead of int to avoid extension to long in generated code Word off = Word.signed(offset); if (constantSize && ((size - offset) / 8) <= MAX_UNROLLED_OBJECT_ZEROING_STORES) { if (useSnippetCounters) { new_seqInit.inc(); } explodeLoop(); } else { if (useSnippetCounters) { new_loopInit.inc(); } } for (; off.rawValue() < size; off = off.add(8)) { memory.initializeLong(off, value, INIT_LOCATION); } } } /** * Fill uninitialized memory with garbage value in a newly allocated object, unrolling as * necessary and ensuring that stores are aligned. * * @param size number of bytes to zero * @param memory beginning of object which is being zeroed * @param constantSize is {@code size} known to be constant in the snippet * @param startOffset offset to begin zeroing. May not be word aligned. * @param manualUnroll maximally unroll zeroing */ private static void fillWithGarbage(int size, Word memory, boolean constantSize, int startOffset, boolean manualUnroll, boolean useSnippetCounters) { fillMemory(0xfefefefefefefefeL, size, memory, constantSize, startOffset, manualUnroll, useSnippetCounters); } /** * Formats some allocated memory with an object header and zeroes out the rest. Disables asserts * since they can't be compiled in stubs. */ public static Object formatObjectForStub(KlassPointer hub, int size, Word memory, Word compileTimePrototypeMarkWord) { return formatObject(hub, size, memory, compileTimePrototypeMarkWord, true, false, false); } /** * Formats some allocated memory with an object header and zeroes out the rest. */ protected static Object formatObject(KlassPointer hub, int size, Word memory, Word compileTimePrototypeMarkWord, boolean fillContents, boolean constantSize, boolean useSnippetCounters) { Word prototypeMarkWord = useBiasedLocking(INJECTED_VMCONFIG) ? hub.readWord(prototypeMarkWordOffset(INJECTED_VMCONFIG), PROTOTYPE_MARK_WORD_LOCATION) : compileTimePrototypeMarkWord; initializeObjectHeader(memory, prototypeMarkWord, hub); if (fillContents) { zeroMemory(size, memory, constantSize, instanceHeaderSize(INJECTED_VMCONFIG), false, useSnippetCounters); } else if (REPLACEMENTS_ASSERTIONS_ENABLED) { fillWithGarbage(size, memory, constantSize, instanceHeaderSize(INJECTED_VMCONFIG), false, useSnippetCounters); } MembarNode.memoryBarrier(MemoryBarriers.STORE_STORE, INIT_LOCATION); return memory.toObject(); } @Snippet protected static void verifyHeap(@ConstantParameter Register threadRegister) { Word thread = registerAsWord(threadRegister); Word topValue = readTlabTop(thread); if (!topValue.equal(Word.zero())) { Word topValueContents = topValue.readWord(0, MARK_WORD_LOCATION); if (topValueContents.equal(Word.zero())) { AssertionSnippets.vmMessageC(AssertionSnippets.ASSERTION_VM_MESSAGE_C, true, cstring("overzeroing of TLAB detected"), 0L, 0L, 0L); } } } /** * Formats some allocated memory with an object header and zeroes out the rest. */ public static Object formatArray(KlassPointer hub, int allocationSize, int length, int headerSize, Word memory, Word prototypeMarkWord, boolean fillContents, boolean maybeUnroll, boolean useSnippetCounters) { memory.writeInt(arrayLengthOffset(INJECTED_VMCONFIG), length, INIT_LOCATION); /* * store hub last as the concurrent garbage collectors assume length is valid if hub field * is not null */ initializeObjectHeader(memory, prototypeMarkWord, hub); if (fillContents) { zeroMemory(allocationSize, memory, false, headerSize, maybeUnroll, useSnippetCounters); } else if (REPLACEMENTS_ASSERTIONS_ENABLED) { fillWithGarbage(allocationSize, memory, false, headerSize, maybeUnroll, useSnippetCounters); } MembarNode.memoryBarrier(MemoryBarriers.STORE_STORE, INIT_LOCATION); return memory.toObject(); } public static class Templates extends AbstractTemplates { private final SnippetInfo allocateInstance = snippet(NewObjectSnippets.class, "allocateInstance", INIT_LOCATION, MARK_WORD_LOCATION, HUB_WRITE_LOCATION, TLAB_TOP_LOCATION, TLAB_END_LOCATION); private final SnippetInfo allocateInstancePIC = snippet(NewObjectSnippets.class, "allocateInstancePIC", INIT_LOCATION, MARK_WORD_LOCATION, HUB_WRITE_LOCATION, TLAB_TOP_LOCATION, TLAB_END_LOCATION); private final SnippetInfo allocateArray = snippet(NewObjectSnippets.class, "allocateArray", INIT_LOCATION, MARK_WORD_LOCATION, HUB_WRITE_LOCATION, TLAB_TOP_LOCATION, TLAB_END_LOCATION); private final SnippetInfo allocateArrayPIC = snippet(NewObjectSnippets.class, "allocateArrayPIC", INIT_LOCATION, MARK_WORD_LOCATION, HUB_WRITE_LOCATION, TLAB_TOP_LOCATION, TLAB_END_LOCATION); private final SnippetInfo allocatePrimitiveArrayPIC = snippet(NewObjectSnippets.class, "allocatePrimitiveArrayPIC", INIT_LOCATION, MARK_WORD_LOCATION, HUB_WRITE_LOCATION, TLAB_TOP_LOCATION, TLAB_END_LOCATION); private final SnippetInfo allocateArrayDynamic = snippet(NewObjectSnippets.class, "allocateArrayDynamic", INIT_LOCATION, MARK_WORD_LOCATION, HUB_WRITE_LOCATION, TLAB_TOP_LOCATION, TLAB_END_LOCATION); private final SnippetInfo allocateInstanceDynamic = snippet(NewObjectSnippets.class, "allocateInstanceDynamic", INIT_LOCATION, MARK_WORD_LOCATION, HUB_WRITE_LOCATION, TLAB_TOP_LOCATION, TLAB_END_LOCATION); private final SnippetInfo newmultiarray = snippet(NewObjectSnippets.class, "newmultiarray", INIT_LOCATION, TLAB_TOP_LOCATION, TLAB_END_LOCATION); private final SnippetInfo newmultiarrayPIC = snippet(NewObjectSnippets.class, "newmultiarrayPIC", INIT_LOCATION, TLAB_TOP_LOCATION, TLAB_END_LOCATION); private final SnippetInfo verifyHeap = snippet(NewObjectSnippets.class, "verifyHeap"); private final GraalHotSpotVMConfig config; public Templates(HotSpotProviders providers, TargetDescription target, GraalHotSpotVMConfig config) { super(providers, providers.getSnippetReflection(), target); this.config = config; } /** * Lowers a {@link NewInstanceNode}. */ public void lower(NewInstanceNode newInstanceNode, HotSpotRegistersProvider registers, LoweringTool tool) { StructuredGraph graph = newInstanceNode.graph(); HotSpotResolvedObjectType type = (HotSpotResolvedObjectType) newInstanceNode.instanceClass(); assert !type.isArray(); ConstantNode hub = ConstantNode.forConstant(KlassPointerStamp.klassNonNull(), type.klass(), providers.getMetaAccess(), graph); int size = instanceSize(type); SnippetInfo snippet = GeneratePIC.getValue() ? allocateInstancePIC : allocateInstance; Arguments args = new Arguments(snippet, graph.getGuardsStage(), tool.getLoweringStage()); args.addConst("size", size); args.add("hub", hub); args.add("prototypeMarkWord", type.prototypeMarkWord()); args.addConst("fillContents", newInstanceNode.fillContents()); args.addConst("threadRegister", registers.getThreadRegister()); args.addConst("constantSize", true); args.addConst("typeContext", HotspotSnippetsOptions.ProfileAllocations.getValue() ? type.toJavaName(false) : ""); SnippetTemplate template = template(args); Debug.log("Lowering allocateInstance in %s: node=%s, template=%s, arguments=%s", graph, newInstanceNode, template, args); template.instantiate(providers.getMetaAccess(), newInstanceNode, DEFAULT_REPLACER, args); } /** * Lowers a {@link NewArrayNode}. */ public void lower(NewArrayNode newArrayNode, HotSpotRegistersProvider registers, LoweringTool tool) { StructuredGraph graph = newArrayNode.graph(); ResolvedJavaType elementType = newArrayNode.elementType(); HotSpotResolvedObjectType arrayType = (HotSpotResolvedObjectType) elementType.getArrayClass(); JavaKind elementKind = elementType.getJavaKind(); ConstantNode hub = ConstantNode.forConstant(KlassPointerStamp.klassNonNull(), arrayType.klass(), providers.getMetaAccess(), graph); final int headerSize = getArrayBaseOffset(elementKind); int log2ElementSize = CodeUtil.log2(HotSpotJVMCIRuntimeProvider.getArrayIndexScale(elementKind)); SnippetInfo snippet; if (GeneratePIC.getValue()) { if (elementType.isPrimitive()) { snippet = allocatePrimitiveArrayPIC; } else { snippet = allocateArrayPIC; } } else { snippet = allocateArray; } Arguments args = new Arguments(snippet, graph.getGuardsStage(), tool.getLoweringStage()); args.add("hub", hub); ValueNode length = newArrayNode.length(); args.add("length", length.isAlive() ? length : graph.addOrUniqueWithInputs(length)); assert arrayType.prototypeMarkWord() == lookupArrayClass(tool, JavaKind.Object).prototypeMarkWord() : "all array types are assumed to have the same prototypeMarkWord"; args.add("prototypeMarkWord", arrayType.prototypeMarkWord()); args.addConst("headerSize", headerSize); args.addConst("log2ElementSize", log2ElementSize); args.addConst("fillContents", newArrayNode.fillContents()); args.addConst("threadRegister", registers.getThreadRegister()); args.addConst("maybeUnroll", length.isConstant()); args.addConst("typeContext", HotspotSnippetsOptions.ProfileAllocations.getValue() ? arrayType.toJavaName(false) : ""); SnippetTemplate template = template(args); Debug.log("Lowering allocateArray in %s: node=%s, template=%s, arguments=%s", graph, newArrayNode, template, args); template.instantiate(providers.getMetaAccess(), newArrayNode, DEFAULT_REPLACER, args); } public void lower(DynamicNewInstanceNode newInstanceNode, HotSpotRegistersProvider registers, LoweringTool tool) { Arguments args = new Arguments(allocateInstanceDynamic, newInstanceNode.graph().getGuardsStage(), tool.getLoweringStage()); args.add("type", newInstanceNode.getInstanceType()); ValueNode classClass = newInstanceNode.getClassClass(); assert classClass != null; args.add("classClass", classClass); args.addConst("fillContents", newInstanceNode.fillContents()); args.addConst("threadRegister", registers.getThreadRegister()); SnippetTemplate template = template(args); template.instantiate(providers.getMetaAccess(), newInstanceNode, DEFAULT_REPLACER, args); } public void lower(DynamicNewArrayNode newArrayNode, HotSpotRegistersProvider registers, LoweringTool tool) { StructuredGraph graph = newArrayNode.graph(); Arguments args = new Arguments(allocateArrayDynamic, newArrayNode.graph().getGuardsStage(), tool.getLoweringStage()); args.add("elementType", newArrayNode.getElementType()); ValueNode voidClass = newArrayNode.getVoidClass(); assert voidClass != null; args.add("voidClass", voidClass); ValueNode length = newArrayNode.length(); args.add("length", length.isAlive() ? length : graph.addOrUniqueWithInputs(length)); args.addConst("fillContents", newArrayNode.fillContents()); args.addConst("threadRegister", registers.getThreadRegister()); /* * We use Kind.Illegal as a marker value instead of null because constant snippet * parameters cannot be null. */ args.addConst("knownElementKind", newArrayNode.getKnownElementKind() == null ? JavaKind.Illegal : newArrayNode.getKnownElementKind()); if (newArrayNode.getKnownElementKind() != null) { args.addConst("knownLayoutHelper", lookupArrayClass(tool, newArrayNode.getKnownElementKind()).layoutHelper()); } else { args.addConst("knownLayoutHelper", 0); } args.add("prototypeMarkWord", lookupArrayClass(tool, JavaKind.Object).prototypeMarkWord()); SnippetTemplate template = template(args); template.instantiate(providers.getMetaAccess(), newArrayNode, DEFAULT_REPLACER, args); } private static HotSpotResolvedObjectType lookupArrayClass(LoweringTool tool, JavaKind kind) { return (HotSpotResolvedObjectType) tool.getMetaAccess().lookupJavaType(kind == JavaKind.Object ? Object.class : kind.toJavaClass()).getArrayClass(); } public void lower(NewMultiArrayNode newmultiarrayNode, LoweringTool tool) { StructuredGraph graph = newmultiarrayNode.graph(); int rank = newmultiarrayNode.dimensionCount(); ValueNode[] dims = new ValueNode[rank]; for (int i = 0; i < newmultiarrayNode.dimensionCount(); i++) { dims[i] = newmultiarrayNode.dimension(i); } HotSpotResolvedObjectType type = (HotSpotResolvedObjectType) newmultiarrayNode.type(); ConstantNode hub = ConstantNode.forConstant(KlassPointerStamp.klassNonNull(), type.klass(), providers.getMetaAccess(), graph); SnippetInfo snippet = GeneratePIC.getValue() ? newmultiarrayPIC : newmultiarray; Arguments args = new Arguments(snippet, graph.getGuardsStage(), tool.getLoweringStage()); args.add("hub", hub); args.addConst("rank", rank); args.addVarargs("dimensions", int.class, StampFactory.forKind(JavaKind.Int), dims); template(args).instantiate(providers.getMetaAccess(), newmultiarrayNode, DEFAULT_REPLACER, args); } private static int instanceSize(HotSpotResolvedObjectType type) { int size = type.instanceSize(); assert size >= 0; return size; } public void lower(VerifyHeapNode verifyHeapNode, HotSpotRegistersProvider registers, LoweringTool tool) { if (config.cAssertions) { Arguments args = new Arguments(verifyHeap, verifyHeapNode.graph().getGuardsStage(), tool.getLoweringStage()); args.addConst("threadRegister", registers.getThreadRegister()); SnippetTemplate template = template(args); template.instantiate(providers.getMetaAccess(), verifyHeapNode, DEFAULT_REPLACER, args); } else { GraphUtil.removeFixedWithUnusedInputs(verifyHeapNode); } } } private static final SnippetCounter.Group countersNew = SnippetCounters.getValue() ? new SnippetCounter.Group("NewInstance") : null; private static final SnippetCounter new_seqInit = new SnippetCounter(countersNew, "tlabSeqInit", "TLAB alloc with unrolled zeroing"); private static final SnippetCounter new_loopInit = new SnippetCounter(countersNew, "tlabLoopInit", "TLAB alloc with zeroing in a loop"); private static final SnippetCounter new_stub = new SnippetCounter(countersNew, "stub", "alloc and zeroing via stub"); private static final SnippetCounter.Group countersNewArray = SnippetCounters.getValue() ? new SnippetCounter.Group("NewArray") : null; private static final SnippetCounter newarray_loopInit = new SnippetCounter(countersNewArray, "tlabLoopInit", "TLAB alloc with zeroing in a loop"); private static final SnippetCounter newarray_stub = new SnippetCounter(countersNewArray, "stub", "alloc and zeroing via stub"); }