Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/HotSpotReplacementsUtil.java @ 19412:e6637891a870
Simplify NodeClass management.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 16 Feb 2015 18:51:13 +0100 |
parents | aa4f2e3629ca |
children | 14e703edb2ab |
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/* * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.hotspot.replacements; import static com.oracle.graal.compiler.common.UnsafeAccess.*; import static com.oracle.graal.hotspot.HotSpotGraalRuntime.*; import static com.oracle.graal.hotspot.meta.HotSpotForeignCallsProviderImpl.*; import static com.oracle.graal.nodes.extended.BranchProbabilityNode.*; import com.oracle.graal.api.code.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.api.replacements.*; import com.oracle.graal.compiler.common.*; import com.oracle.graal.graph.Node.ConstantNodeParameter; import com.oracle.graal.graph.Node.NodeIntrinsic; import com.oracle.graal.hotspot.*; import com.oracle.graal.hotspot.nodes.*; import com.oracle.graal.hotspot.word.*; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.replacements.*; import com.oracle.graal.replacements.nodes.*; import com.oracle.graal.word.*; //JaCoCo Exclude /** * A collection of methods used in HotSpot snippets, substitutions and stubs. */ public class HotSpotReplacementsUtil { @Fold public static HotSpotVMConfig config() { return runtime().getConfig(); } @Fold public static boolean useTLAB() { return config().useTLAB; } @Fold public static boolean verifyOops() { return config().verifyOops; } public static final LocationIdentity EXCEPTION_OOP_LOCATION = NamedLocationIdentity.mutable("ExceptionOop"); /** * @see HotSpotVMConfig#threadExceptionOopOffset */ @Fold public static int threadExceptionOopOffset() { return config().threadExceptionOopOffset; } public static final LocationIdentity EXCEPTION_PC_LOCATION = NamedLocationIdentity.mutable("ExceptionPc"); @Fold public static int threadExceptionPcOffset() { return config().threadExceptionPcOffset; } public static final LocationIdentity LAST_JAVA_PC_LOCATION = NamedLocationIdentity.mutable("LastJavaPc"); @Fold public static int threadLastJavaPcOffset() { return config().threadLastJavaPcOffset(); } public static final LocationIdentity LAST_JAVA_FP_LOCATION = NamedLocationIdentity.mutable("LastJavaFp"); @Fold public static int threadLastJavaFpOffset() { return config().threadLastJavaFpOffset(); } public static final LocationIdentity TLAB_TOP_LOCATION = NamedLocationIdentity.mutable("TlabTop"); @Fold public static int threadTlabTopOffset() { return config().threadTlabTopOffset(); } public static final LocationIdentity TLAB_END_LOCATION = NamedLocationIdentity.mutable("TlabEnd"); @Fold private static int threadTlabEndOffset() { return config().threadTlabEndOffset(); } public static final LocationIdentity TLAB_START_LOCATION = NamedLocationIdentity.mutable("TlabStart"); @Fold private static int threadTlabStartOffset() { return config().threadTlabStartOffset(); } public static final LocationIdentity PENDING_EXCEPTION_LOCATION = NamedLocationIdentity.mutable("PendingException"); /** * @see HotSpotVMConfig#pendingExceptionOffset */ @Fold private static int threadPendingExceptionOffset() { return config().pendingExceptionOffset; } public static final LocationIdentity PENDING_DEOPTIMIZATION_LOCATION = NamedLocationIdentity.mutable("PendingDeoptimization"); /** * @see HotSpotVMConfig#pendingDeoptimizationOffset */ @Fold private static int threadPendingDeoptimizationOffset() { return config().pendingDeoptimizationOffset; } public static final LocationIdentity OBJECT_RESULT_LOCATION = NamedLocationIdentity.mutable("ObjectResult"); @Fold private static int objectResultOffset() { return config().threadObjectResultOffset; } /** * @see HotSpotVMConfig#threadExceptionOopOffset */ public static Object readExceptionOop(Word thread) { return thread.readObject(threadExceptionOopOffset(), EXCEPTION_OOP_LOCATION); } public static Word readExceptionPc(Word thread) { return thread.readWord(threadExceptionPcOffset(), EXCEPTION_PC_LOCATION); } /** * @see HotSpotVMConfig#threadExceptionOopOffset */ public static void writeExceptionOop(Word thread, Object value) { thread.writeObject(threadExceptionOopOffset(), value, EXCEPTION_OOP_LOCATION); } public static void writeExceptionPc(Word thread, Word value) { thread.writeWord(threadExceptionPcOffset(), value, EXCEPTION_PC_LOCATION); } public static void writeLastJavaPc(Word thread, Word value) { thread.writeWord(threadLastJavaPcOffset(), value, LAST_JAVA_PC_LOCATION); } public static void writeLastJavaFp(Word thread, Word value) { thread.writeWord(threadLastJavaFpOffset(), value, LAST_JAVA_FP_LOCATION); } public static Word readTlabTop(Word thread) { return thread.readWord(threadTlabTopOffset(), TLAB_TOP_LOCATION); } public static Word readTlabEnd(Word thread) { return thread.readWord(threadTlabEndOffset(), TLAB_END_LOCATION); } public static Word readTlabStart(Word thread) { return thread.readWord(threadTlabStartOffset(), TLAB_START_LOCATION); } public static void writeTlabTop(Word thread, Word top) { thread.writeWord(threadTlabTopOffset(), top, TLAB_TOP_LOCATION); } public static void initializeTlab(Word thread, Word start, Word end) { thread.writeWord(threadTlabStartOffset(), start, TLAB_START_LOCATION); thread.writeWord(threadTlabTopOffset(), start, TLAB_TOP_LOCATION); thread.writeWord(threadTlabEndOffset(), end, TLAB_END_LOCATION); } /** * Clears the pending exception for the given thread. * * @return {@code true} if there was a pending exception */ public static boolean clearPendingException(Word thread) { boolean result = thread.readObject(threadPendingExceptionOffset(), PENDING_EXCEPTION_LOCATION) != null; thread.writeObject(threadPendingExceptionOffset(), null, PENDING_EXCEPTION_LOCATION); return result; } /** * Reads the pending deoptimization value for the given thread. * * @return {@code true} if there was a pending deoptimization */ public static int readPendingDeoptimization(Word thread) { return thread.readInt(threadPendingDeoptimizationOffset(), PENDING_DEOPTIMIZATION_LOCATION); } /** * Writes the pending deoptimization value for the given thread. */ public static void writePendingDeoptimization(Word thread, int value) { thread.writeInt(threadPendingDeoptimizationOffset(), value, PENDING_DEOPTIMIZATION_LOCATION); } /** * Gets and clears the object result from a runtime call stored in a thread local. * * @return the object that was in the thread local */ public static Object getAndClearObjectResult(Word thread) { Object result = thread.readObject(objectResultOffset(), OBJECT_RESULT_LOCATION); thread.writeObject(objectResultOffset(), null, OBJECT_RESULT_LOCATION); return result; } public static final LocationIdentity JAVA_THREAD_THREAD_OBJECT_LOCATION = NamedLocationIdentity.mutable("JavaThread::_threadObj"); @Fold public static int threadObjectOffset() { return config().threadObjectOffset; } public static final LocationIdentity JAVA_THREAD_OSTHREAD_LOCATION = NamedLocationIdentity.mutable("JavaThread::_osthread"); @Fold public static int osThreadOffset() { return config().osThreadOffset; } @Fold public static int osThreadInterruptedOffset() { return config().osThreadInterruptedOffset; } @Fold public static Kind getWordKind() { return runtime().getTarget().wordKind; } @Fold public static int wordSize() { return runtime().getTarget().wordSize; } @Fold public static int pageSize() { return unsafe.pageSize(); } @Fold public static int heapWordSize() { return config().heapWordSize; } public static final LocationIdentity PROTOTYPE_MARK_WORD_LOCATION = NamedLocationIdentity.mutable("PrototypeMarkWord"); @Fold public static int prototypeMarkWordOffset() { return config().prototypeMarkWordOffset; } @Fold public static long arrayPrototypeMarkWord() { return config().arrayPrototypeMarkWord(); } public static final LocationIdentity KLASS_ACCESS_FLAGS_LOCATION = NamedLocationIdentity.immutable("Klass::_access_flags"); @Fold public static int klassAccessFlagsOffset() { return config().klassAccessFlagsOffset; } @Fold public static int jvmAccWrittenFlags() { return config().jvmAccWrittenFlags; } public static final LocationIdentity KLASS_LAYOUT_HELPER_LOCATION = NamedLocationIdentity.immutable("Klass::_layout_helper"); @Fold public static int klassLayoutHelperOffset() { return config().klassLayoutHelperOffset; } public static int readLayoutHelper(KlassPointer hub) { // return hub.readInt(klassLayoutHelperOffset(), KLASS_LAYOUT_HELPER_LOCATION); GuardingNode anchorNode = SnippetAnchorNode.anchor(); return loadKlassLayoutHelperIntrinsic(hub, anchorNode); } @NodeIntrinsic(value = KlassLayoutHelperNode.class) public static native int loadKlassLayoutHelperIntrinsic(KlassPointer object, GuardingNode anchor); @NodeIntrinsic(value = KlassLayoutHelperNode.class) public static native int loadKlassLayoutHelperIntrinsic(KlassPointer object); /** * Checks if class {@code klass} is an array. * * See: Klass::layout_helper_is_array * * @param klass the class to be checked * @return true if klass is an array, false otherwise */ public static boolean klassIsArray(KlassPointer klass) { /* * The less-than check only works if both values are ints. We use local variables to make * sure these are still ints and haven't changed. */ final int layoutHelper = readLayoutHelper(klass); final int layoutHelperNeutralValue = config().klassLayoutHelperNeutralValue; return (layoutHelper < layoutHelperNeutralValue); } public static final LocationIdentity ARRAY_KLASS_COMPONENT_MIRROR = NamedLocationIdentity.immutable("ArrayKlass::_component_mirror"); @Fold public static int arrayKlassComponentMirrorOffset() { return config().arrayKlassComponentMirrorOffset; } public static final LocationIdentity KLASS_SUPER_KLASS_LOCATION = NamedLocationIdentity.immutable("Klass::_super"); @Fold public static int klassSuperKlassOffset() { return config().klassSuperKlassOffset; } public static final LocationIdentity MARK_WORD_LOCATION = NamedLocationIdentity.mutable("MarkWord"); @Fold public static int markOffset() { return config().markOffset; } public static final LocationIdentity HUB_WRITE_LOCATION = NamedLocationIdentity.mutable("Hub:write"); public static final LocationIdentity HUB_LOCATION = NamedLocationIdentity.immutable("Hub"); @Fold private static int hubOffset() { return config().hubOffset; } public static void initializeObjectHeader(Word memory, Word markWord, KlassPointer hub) { memory.writeWord(markOffset(), markWord, MARK_WORD_LOCATION); StoreHubNode.write(memory, hub); } @Fold public static int unlockedMask() { return config().unlockedMask; } /** * Mask for a biasable, locked or unlocked mark word. * * <pre> * +----------------------------------+-+-+ * | 1|1|1| * +----------------------------------+-+-+ * </pre> * */ @Fold public static int biasedLockMaskInPlace() { return config().biasedLockMaskInPlace; } @Fold public static int epochMaskInPlace() { return config().epochMaskInPlace; } /** * Pattern for a biasable, unlocked mark word. * * <pre> * +----------------------------------+-+-+ * | 1|0|1| * +----------------------------------+-+-+ * </pre> * */ @Fold public static int biasedLockPattern() { return config().biasedLockPattern; } @Fold public static int ageMaskInPlace() { return config().ageMaskInPlace; } @Fold public static int metaspaceArrayLengthOffset() { return config().metaspaceArrayLengthOffset; } @Fold public static int metaspaceArrayBaseOffset() { return config().metaspaceArrayBaseOffset; } @Fold public static int arrayLengthOffset() { return config().arrayLengthOffset; } @Fold public static int arrayBaseOffset(Kind elementKind) { return runtime().getArrayBaseOffset(elementKind); } @Fold public static int arrayIndexScale(Kind elementKind) { return runtime().getArrayIndexScale(elementKind); } @Fold public static int instanceHeaderSize() { return config().useCompressedClassPointers ? (2 * wordSize()) - 4 : 2 * wordSize(); } @Fold public static byte dirtyCardValue() { return config().dirtyCardValue; } @Fold public static byte g1YoungCardValue() { return config().g1YoungCardValue; } @Fold public static int cardTableShift() { return config().cardtableShift(); } @Fold public static long cardTableStart() { return config().cardtableStartAddress(); } @Fold public static int g1CardQueueIndexOffset() { return config().g1CardQueueIndexOffset(); } @Fold public static int g1CardQueueBufferOffset() { return config().g1CardQueueBufferOffset(); } @Fold public static int logOfHeapRegionGrainBytes() { return config().logOfHRGrainBytes; } @Fold public static int g1SATBQueueMarkingOffset() { return config().g1SATBQueueMarkingOffset(); } @Fold public static int g1SATBQueueIndexOffset() { return config().g1SATBQueueIndexOffset(); } @Fold public static int g1SATBQueueBufferOffset() { return config().g1SATBQueueBufferOffset(); } public static final LocationIdentity KLASS_SUPER_CHECK_OFFSET_LOCATION = NamedLocationIdentity.immutable("Klass::_super_check_offset"); @Fold public static int superCheckOffsetOffset() { return config().superCheckOffsetOffset; } public static final LocationIdentity SECONDARY_SUPER_CACHE_LOCATION = NamedLocationIdentity.mutable("SecondarySuperCache"); @Fold public static int secondarySuperCacheOffset() { return config().secondarySuperCacheOffset; } public static final LocationIdentity SECONDARY_SUPERS_LOCATION = NamedLocationIdentity.immutable("SecondarySupers"); @Fold public static int secondarySupersOffset() { return config().secondarySupersOffset; } public static final LocationIdentity DISPLACED_MARK_WORD_LOCATION = NamedLocationIdentity.mutable("DisplacedMarkWord"); @Fold public static int lockDisplacedMarkOffset() { return config().basicLockDisplacedHeaderOffset; } @Fold public static boolean useBiasedLocking() { return config().useBiasedLocking; } @Fold public static boolean useDeferredInitBarriers() { return config().useDeferredInitBarriers; } @Fold public static boolean useG1GC() { return config().useG1GC; } @Fold public static boolean useCompressedOops() { return config().useCompressedOops; } @Fold static int uninitializedIdentityHashCodeValue() { return config().uninitializedIdentityHashCodeValue; } @Fold static int identityHashCodeShift() { return config().identityHashCodeShift; } /** * Loads the hub of an object (without null checking it first). */ public static KlassPointer loadHub(Object object) { return loadHubIntrinsic(object); } public static Object verifyOop(Object object) { if (verifyOops()) { verifyOopStub(VERIFY_OOP, object); } return object; } @NodeIntrinsic(ForeignCallNode.class) private static native Object verifyOopStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Object object); public static Word loadWordFromObject(Object object, int offset) { ReplacementsUtil.staticAssert(offset != hubOffset(), "Use loadHubIntrinsic instead of loadWordFromObject"); return loadWordFromObjectIntrinsic(object, offset, getWordKind(), LocationIdentity.ANY_LOCATION); } public static Word loadWordFromObject(Object object, int offset, LocationIdentity identity) { ReplacementsUtil.staticAssert(offset != hubOffset(), "Use loadHubIntrinsic instead of loadWordFromObject"); return loadWordFromObjectIntrinsic(object, offset, getWordKind(), identity); } /** * Reads the value of a given register. * * @param register a register which must not be available to the register allocator * @return the value of {@code register} as a word */ public static Word registerAsWord(@ConstantNodeParameter Register register) { return registerAsWord(register, true, false); } @NodeIntrinsic(value = ReadRegisterNode.class, setStampFromReturnType = true) public static native Word registerAsWord(@ConstantNodeParameter Register register, @ConstantNodeParameter boolean directUse, @ConstantNodeParameter boolean incoming); @NodeIntrinsic(value = WriteRegisterNode.class, setStampFromReturnType = true) public static native void writeRegisterAsWord(@ConstantNodeParameter Register register, Word value); @SuppressWarnings("unused") @NodeIntrinsic(value = UnsafeLoadNode.class, setStampFromReturnType = true) private static Word loadWordFromObjectIntrinsic(Object object, long offset, @ConstantNodeParameter Kind wordKind, @ConstantNodeParameter LocationIdentity locationIdentity) { return Word.unsigned(unsafeReadWord(object, offset)); } @SuppressWarnings("unused") @NodeIntrinsic(value = LoadHubNode.class) public static KlassPointer loadHubIntrinsic(Object object, GuardingNode anchor) { return KlassPointer.fromWord(Word.unsigned(unsafeReadKlassPointer(object))); } @NodeIntrinsic(value = LoadHubNode.class) public static KlassPointer loadHubIntrinsic(Object object) { return KlassPointer.fromWord(Word.unsigned(unsafeReadKlassPointer(object))); } @Fold public static int log2WordSize() { return CodeUtil.log2(wordSize()); } public static final LocationIdentity CLASS_STATE_LOCATION = NamedLocationIdentity.mutable("ClassState"); @Fold public static int instanceKlassInitStateOffset() { return config().instanceKlassInitStateOffset; } @Fold public static int instanceKlassStateFullyInitialized() { return config().instanceKlassStateFullyInitialized; } /** * * @param hub the hub of an InstanceKlass * @return true is the InstanceKlass represented by hub is fully initialized */ public static boolean isInstanceKlassFullyInitialized(KlassPointer hub) { return readInstanceKlassState(hub) == instanceKlassStateFullyInitialized(); } private static byte readInstanceKlassState(KlassPointer hub) { return hub.readByte(instanceKlassInitStateOffset(), CLASS_STATE_LOCATION); } public static final LocationIdentity KLASS_MODIFIER_FLAGS_LOCATION = NamedLocationIdentity.immutable("Klass::_modifier_flags"); @Fold public static int klassModifierFlagsOffset() { return config().klassModifierFlagsOffset; } public static final LocationIdentity CLASS_KLASS_LOCATION = NamedLocationIdentity.immutable("Class._klass"); @Fold public static int klassOffset() { return config().klassOffset; } public static final LocationIdentity CLASS_ARRAY_KLASS_LOCATION = NamedLocationIdentity.mutable("Class._array_klass"); @Fold public static int arrayKlassOffset() { return config().arrayKlassOffset; } public static final LocationIdentity CLASS_MIRROR_LOCATION = NamedLocationIdentity.immutable("Klass::_java_mirror"); @Fold public static int classMirrorOffset() { return config().classMirrorOffset; } public static final LocationIdentity HEAP_TOP_LOCATION = NamedLocationIdentity.mutable("HeapTop"); @Fold public static long heapTopAddress() { return config().heapTopAddress; } public static final LocationIdentity HEAP_END_LOCATION = NamedLocationIdentity.mutable("HeapEnd"); @Fold public static long heapEndAddress() { return config().heapEndAddress; } @Fold public static long tlabIntArrayMarkWord() { return config().tlabIntArrayMarkWord(); } @Fold public static boolean inlineContiguousAllocationSupported() { return config().inlineContiguousAllocationSupported; } @Fold public static int tlabAlignmentReserveInHeapWords() { return config().tlabAlignmentReserve; } public static final LocationIdentity TLAB_SIZE_LOCATION = NamedLocationIdentity.mutable("TlabSize"); @Fold public static int threadTlabSizeOffset() { return config().threadTlabSizeOffset(); } public static final LocationIdentity TLAB_THREAD_ALLOCATED_BYTES_LOCATION = NamedLocationIdentity.mutable("TlabThreadAllocatedBytes"); @Fold public static int threadAllocatedBytesOffset() { return config().threadAllocatedBytesOffset; } public static final LocationIdentity TLAB_REFILL_WASTE_LIMIT_LOCATION = NamedLocationIdentity.mutable("RefillWasteLimit"); @Fold public static int tlabRefillWasteLimitOffset() { return config().tlabRefillWasteLimitOffset(); } public static final LocationIdentity TLAB_NOF_REFILLS_LOCATION = NamedLocationIdentity.mutable("TlabNOfRefills"); @Fold public static int tlabNumberOfRefillsOffset() { return config().tlabNumberOfRefillsOffset(); } public static final LocationIdentity TLAB_FAST_REFILL_WASTE_LOCATION = NamedLocationIdentity.mutable("TlabFastRefillWaste"); @Fold public static int tlabFastRefillWasteOffset() { return config().tlabFastRefillWasteOffset(); } public static final LocationIdentity TLAB_SLOW_ALLOCATIONS_LOCATION = NamedLocationIdentity.mutable("TlabSlowAllocations"); @Fold public static int tlabSlowAllocationsOffset() { return config().tlabSlowAllocationsOffset(); } @Fold public static int tlabRefillWasteIncrement() { return config().tlabRefillWasteIncrement; } @Fold public static boolean tlabStats() { return config().tlabStats; } @Fold public static int layoutHelperHeaderSizeShift() { return config().layoutHelperHeaderSizeShift; } @Fold public static int layoutHelperHeaderSizeMask() { return config().layoutHelperHeaderSizeMask; } @Fold public static int layoutHelperLog2ElementSizeShift() { return config().layoutHelperLog2ElementSizeShift; } @Fold public static int layoutHelperLog2ElementSizeMask() { return config().layoutHelperLog2ElementSizeMask; } @Fold public static int layoutHelperElementTypeShift() { return config().layoutHelperElementTypeShift; } @Fold public static int layoutHelperElementTypeMask() { return config().layoutHelperElementTypeMask; } @Fold public static int layoutHelperElementTypePrimitiveInPlace() { return config().layoutHelperElementTypePrimitiveInPlace(); } static int computeHashCode(Object x) { Word mark = loadWordFromObject(x, markOffset()); // this code is independent from biased locking (although it does not look that way) final Word biasedLock = mark.and(biasedLockMaskInPlace()); if (probability(FAST_PATH_PROBABILITY, biasedLock.equal(Word.unsigned(unlockedMask())))) { int hash = (int) mark.unsignedShiftRight(identityHashCodeShift()).rawValue(); if (probability(FAST_PATH_PROBABILITY, hash != uninitializedIdentityHashCodeValue())) { return hash; } } return identityHashCode(IDENTITY_HASHCODE, x); } @NodeIntrinsic(ForeignCallNode.class) public static native int identityHashCode(@ConstantNodeParameter ForeignCallDescriptor descriptor, Object object); @Fold public static boolean isImmutableCode() { return GraalOptions.ImmutableCode.getValue(); } @Fold public static boolean generatePIC() { return GraalOptions.GeneratePIC.getValue(); } @Fold public static int verifiedEntryPointOffset() { return config().nmethodEntryOffset; } @Fold public static long gcTotalCollectionsAddress() { return config().gcTotalCollectionsAddress(); } @Fold public static long referentOffset() { try { return unsafe.objectFieldOffset(java.lang.ref.Reference.class.getDeclaredField("referent")); } catch (Exception e) { throw new GraalInternalError(e); } } public static final LocationIdentity OBJ_ARRAY_KLASS_ELEMENT_KLASS_LOCATION = NamedLocationIdentity.immutable("ObjArrayKlass::_element_klass"); public static final LocationIdentity PRIMARY_SUPERS_LOCATION = NamedLocationIdentity.immutable("PrimarySupers"); public static final LocationIdentity METASPACE_ARRAY_LENGTH_LOCATION = NamedLocationIdentity.immutable("MetaspaceArrayLength"); public static final LocationIdentity SECONDARY_SUPERS_ELEMENT_LOCATION = NamedLocationIdentity.immutable("SecondarySupersElement"); }