/*
 * Copyright (c) 2011, 2019, 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;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.List;

import org.graalvm.compiler.core.common.CompressEncoding;
import org.graalvm.compiler.hotspot.nodes.GraalHotSpotVMConfigNode;

import jdk.vm.ci.common.JVMCIError;
import jdk.vm.ci.hotspot.HotSpotResolvedJavaMethod;
import jdk.vm.ci.hotspot.HotSpotVMConfigStore;
import jdk.vm.ci.meta.ResolvedJavaMethod;

Used to access native configuration details.
/**
 * Used to access native configuration details.
 */
public class GraalHotSpotVMConfig extends GraalHotSpotVMConfigBase {

    GraalHotSpotVMConfig(HotSpotVMConfigStore store) {
        super(store);

        assert narrowKlassShift <= logKlassAlignment;
        assert narrowOopShift <= logMinObjAlignment();
        oopEncoding = new CompressEncoding(narrowOopBase, narrowOopShift);
        klassEncoding = new CompressEncoding(narrowKlassBase, narrowKlassShift);

        assert check();
    }

    private final CompressEncoding oopEncoding;
    private final CompressEncoding klassEncoding;

    public CompressEncoding getOopEncoding() {
        return oopEncoding;
    }

    public CompressEncoding getKlassEncoding() {
        return klassEncoding;
    }

    public final boolean cAssertions = getConstant("ASSERT", Boolean.class);

    public final int codeEntryAlignment = getFlag("CodeEntryAlignment", Integer.class);
    public final boolean enableContended = getFlag("EnableContended", Boolean.class);
    public final boolean restrictContended = getFlag("RestrictContended", Boolean.class);
    public final int contendedPaddingWidth = getFlag("ContendedPaddingWidth", Integer.class);
    public final int fieldsAllocationStyle = getFlag("FieldsAllocationStyle", Integer.class);
    public final boolean compactFields = getFlag("CompactFields", Boolean.class);
    public final boolean verifyOops = getFlag("VerifyOops", Boolean.class);
    public final boolean ciTime = getFlag("CITime", Boolean.class);
    public final boolean ciTimeEach = getFlag("CITimeEach", Boolean.class);
    public final boolean dontCompileHugeMethods = getFlag("DontCompileHugeMethods", Boolean.class);
    public final int hugeMethodLimit = getFlag("HugeMethodLimit", Integer.class);
    public final boolean printInlining = getFlag("PrintInlining", Boolean.class);
    public final boolean inline = getFlag("Inline", Boolean.class);
    public final boolean inlineNotify = versioned.inlineNotify;
    public final boolean useFastLocking = getFlag("JVMCIUseFastLocking", Boolean.class);
    public final boolean forceUnreachable = getFlag("ForceUnreachable", Boolean.class);
    public final int codeSegmentSize = getFlag("CodeCacheSegmentSize", Integer.class);
    public final boolean foldStableValues = getFlag("FoldStableValues", Boolean.class);
    public final int maxVectorSize = getFlag("MaxVectorSize", Integer.class);

    public final boolean verifyBeforeGC = getFlag("VerifyBeforeGC", Boolean.class);
    public final boolean verifyAfterGC = getFlag("VerifyAfterGC", Boolean.class);

    public final boolean useTLAB = getFlag("UseTLAB", Boolean.class);
    public final boolean useBiasedLocking = getFlag("UseBiasedLocking", Boolean.class);
    public final boolean usePopCountInstruction = getFlag("UsePopCountInstruction", Boolean.class);
    public final boolean useAESIntrinsics = getFlag("UseAESIntrinsics", Boolean.class);
    public final boolean useCRC32Intrinsics = getFlag("UseCRC32Intrinsics", Boolean.class);
    public final boolean useCRC32CIntrinsics = versioned.useCRC32CIntrinsics;
    public final boolean threadLocalHandshakes = getFlag("ThreadLocalHandshakes", Boolean.class, false);

    private final boolean useMultiplyToLenIntrinsic = getFlag("UseMultiplyToLenIntrinsic", Boolean.class);
    private final boolean useSHA1Intrinsics = getFlag("UseSHA1Intrinsics", Boolean.class);
    private final boolean useSHA256Intrinsics = getFlag("UseSHA256Intrinsics", Boolean.class);
    private final boolean useSHA512Intrinsics = getFlag("UseSHA512Intrinsics", Boolean.class);
    private final boolean useMontgomeryMultiplyIntrinsic = getFlag("UseMontgomeryMultiplyIntrinsic", Boolean.class, false);
    private final boolean useMontgomerySquareIntrinsic = getFlag("UseMontgomerySquareIntrinsic", Boolean.class, false);
    private final boolean useMulAddIntrinsic = getFlag("UseMulAddIntrinsic", Boolean.class, false);
    private final boolean useSquareToLenIntrinsic = getFlag("UseSquareToLenIntrinsic", Boolean.class, false);

    /*
     * These are methods because in some JDKs the flags are visible but the stubs themselves haven't
     * been exported so we have to check both if the flag is on and if we have the stub.
     */
    public boolean useMultiplyToLenIntrinsic() {
        return useMultiplyToLenIntrinsic && multiplyToLen != 0;
    }

    public boolean useSHA1Intrinsics() {
        return useSHA1Intrinsics && sha1ImplCompress != 0;
    }

    public boolean useSHA256Intrinsics() {
        return useSHA256Intrinsics && sha256ImplCompress != 0;
    }

    public boolean useSHA512Intrinsics() {
        return useSHA512Intrinsics && sha512ImplCompress != 0;
    }

    public boolean useMontgomeryMultiplyIntrinsic() {
        return useMontgomeryMultiplyIntrinsic && montgomeryMultiply != 0;
    }

    public boolean useMontgomerySquareIntrinsic() {
        return useMontgomerySquareIntrinsic && montgomerySquare != 0;
    }

    public boolean useMulAddIntrinsic() {
        return useMulAddIntrinsic && mulAdd != 0;
    }

    public boolean useSquareToLenIntrinsic() {
        return useSquareToLenIntrinsic && squareToLen != 0;
    }

    public boolean inlineNotify() {
        return inlineNotify && notifyAddress != 0;
    }

    public boolean inlineNotifyAll() {
        return inlineNotify && notifyAllAddress != 0;
    }

    public final boolean useG1GC = getFlag("UseG1GC", Boolean.class);
    public final boolean useCMSGC = getFlag("UseConcMarkSweepGC", Boolean.class);

    public final int allocatePrefetchStyle = getFlag("AllocatePrefetchStyle", Integer.class);
    public final int allocatePrefetchInstr = getFlag("AllocatePrefetchInstr", Integer.class);
    public final int allocatePrefetchLines = getFlag("AllocatePrefetchLines", Integer.class);
    public final int allocateInstancePrefetchLines = getFlag("AllocateInstancePrefetchLines", Integer.class);
    public final int allocatePrefetchStepSize = getFlag("AllocatePrefetchStepSize", Integer.class);
    public final int allocatePrefetchDistance = getFlag("AllocatePrefetchDistance", Integer.class);

    private final long universeCollectedHeap = getFieldValue("CompilerToVM::Data::Universe_collectedHeap", Long.class, "CollectedHeap*");
    private final int collectedHeapTotalCollectionsOffset = getFieldOffset("CollectedHeap::_total_collections", Integer.class, "unsigned int");

    public long gcTotalCollectionsAddress() {
        return universeCollectedHeap + collectedHeapTotalCollectionsOffset;
    }

    public final boolean useDeferredInitBarriers = getFlag("ReduceInitialCardMarks", Boolean.class);

    // Compressed Oops related values.
    public final boolean useCompressedOops = getFlag("UseCompressedOops", Boolean.class);
    public final boolean useCompressedClassPointers = getFlag("UseCompressedClassPointers", Boolean.class);

    public final long narrowOopBase = getFieldValue("CompilerToVM::Data::Universe_narrow_oop_base", Long.class, "address");
    public final int narrowOopShift = getFieldValue("CompilerToVM::Data::Universe_narrow_oop_shift", Integer.class, "int");
    public final int objectAlignment = getFlag("ObjectAlignmentInBytes", Integer.class);

    public final int minObjAlignment() {
        return objectAlignment / heapWordSize;
    }

    public final int logMinObjAlignment() {
        return (int) (Math.log(objectAlignment) / Math.log(2));
    }

    public final int narrowKlassSize = getFieldValue("CompilerToVM::Data::sizeof_narrowKlass", Integer.class, "int");
    public final long narrowKlassBase = getFieldValue("CompilerToVM::Data::Universe_narrow_klass_base", Long.class, "address");
    public final int narrowKlassShift = getFieldValue("CompilerToVM::Data::Universe_narrow_klass_shift", Integer.class, "int");
    public final int logKlassAlignment = getConstant("LogKlassAlignmentInBytes", Integer.class);

    public final int stackShadowPages = getFlag("StackShadowPages", Integer.class);
    public final int stackReservedPages = getFlag("StackReservedPages", Integer.class, 0);
    public final boolean useStackBanging = getFlag("UseStackBanging", Boolean.class);
    public final int stackBias = getConstant("STACK_BIAS", Integer.class);
    public final int vmPageSize = getFieldValue("CompilerToVM::Data::vm_page_size", Integer.class, "int");

    public final int markOffset = getFieldOffset("oopDesc::_mark", Integer.class, "markOop");
    public final int hubOffset = getFieldOffset("oopDesc::_metadata._klass", Integer.class, "Klass*");

    public final int prototypeMarkWordOffset = getFieldOffset("Klass::_prototype_header", Integer.class, "markOop");
    public final int subklassOffset = getFieldOffset("Klass::_subklass", Integer.class, "Klass*");
    public final int nextSiblingOffset = getFieldOffset("Klass::_next_sibling", Integer.class, "Klass*");
    public final int superCheckOffsetOffset = getFieldOffset("Klass::_super_check_offset", Integer.class, "juint");
    public final int secondarySuperCacheOffset = getFieldOffset("Klass::_secondary_super_cache", Integer.class, "Klass*");
    public final int secondarySupersOffset = getFieldOffset("Klass::_secondary_supers", Integer.class, "Array<Klass*>*");

    public final boolean classMirrorIsHandle;
    public final int classMirrorOffset;
    {
        String name = "Klass::_java_mirror";
        int offset = -1;
        boolean isHandle = false;
        try {
            offset = getFieldOffset(name, Integer.class, "oop");
        } catch (JVMCIError e) {

        }
        if (offset == -1) {
            try {
                offset = getFieldOffset(name, Integer.class, "jobject");
                isHandle = true;
            } catch (JVMCIError e) {
                try {
                    // JDK-8186777
                    offset = getFieldOffset(name, Integer.class, "OopHandle");
                    isHandle = true;
                } catch (JVMCIError e2) {
                }
            }
        }
        if (offset == -1) {
            throw new JVMCIError("cannot get offset of field " + name + " with type oop, jobject or OopHandle");
        }
        classMirrorOffset = offset;
        classMirrorIsHandle = isHandle;
    }

    public final int klassSuperKlassOffset = getFieldOffset("Klass::_super", Integer.class, "Klass*");
    public final int klassModifierFlagsOffset = getFieldOffset("Klass::_modifier_flags", Integer.class, "jint");
    public final int klassAccessFlagsOffset = getFieldOffset("Klass::_access_flags", Integer.class, "AccessFlags");
    public final int klassLayoutHelperOffset = getFieldOffset("Klass::_layout_helper", Integer.class, "jint");

    public final int klassLayoutHelperNeutralValue = getConstant("Klass::_lh_neutral_value", Integer.class);
    public final int layoutHelperLog2ElementSizeShift = getConstant("Klass::_lh_log2_element_size_shift", Integer.class);
    public final int layoutHelperLog2ElementSizeMask = getConstant("Klass::_lh_log2_element_size_mask", Integer.class);
    public final int layoutHelperElementTypeShift = getConstant("Klass::_lh_element_type_shift", Integer.class);
    public final int layoutHelperElementTypeMask = getConstant("Klass::_lh_element_type_mask", Integer.class);
    public final int layoutHelperHeaderSizeShift = getConstant("Klass::_lh_header_size_shift", Integer.class);
    public final int layoutHelperHeaderSizeMask = getConstant("Klass::_lh_header_size_mask", Integer.class);
    public final int layoutHelperArrayTagShift = getConstant("Klass::_lh_array_tag_shift", Integer.class);
    public final int layoutHelperArrayTagTypeValue = getConstant("Klass::_lh_array_tag_type_value", Integer.class);
    public final int layoutHelperArrayTagObjectValue = getConstant("Klass::_lh_array_tag_obj_value", Integer.class);

    
This filters out the bit that differentiates a type array from an object array.
/**
     * This filters out the bit that differentiates a type array from an object array.
     */
    public int layoutHelperElementTypePrimitiveInPlace() {
        return (layoutHelperArrayTagTypeValue & ~layoutHelperArrayTagObjectValue) << layoutHelperArrayTagShift;
    }

    public final int vtableEntrySize = getFieldValue("CompilerToVM::Data::sizeof_vtableEntry", Integer.class, "int");
    public final int vtableEntryMethodOffset = getFieldOffset("vtableEntry::_method", Integer.class, "Method*");

    public final int instanceKlassInitStateOffset = getFieldOffset("InstanceKlass::_init_state", Integer.class, "u1");
    public final int instanceKlassConstantsOffset = getFieldOffset("InstanceKlass::_constants", Integer.class, "ConstantPool*");
    public final int instanceKlassFieldsOffset = getFieldOffset("InstanceKlass::_fields", Integer.class, "Array<u2>*");
    public final int klassVtableStartOffset = getFieldValue("CompilerToVM::Data::Klass_vtable_start_offset", Integer.class, "int");
    public final int klassVtableLengthOffset = getFieldValue("CompilerToVM::Data::Klass_vtable_length_offset", Integer.class, "int");

    public final int instanceKlassStateLinked = getConstant("InstanceKlass::linked", Integer.class);
    public final int instanceKlassStateFullyInitialized = getConstant("InstanceKlass::fully_initialized", Integer.class);

    public final int arrayOopDescSize = getFieldValue("CompilerToVM::Data::sizeof_arrayOopDesc", Integer.class, "int");

    
The offset of the array length word in an array object's header. See arrayOopDesc::length_offset_in_bytes(). /**
     * The offset of the array length word in an array object's header.
     *
     * See {@code arrayOopDesc::length_offset_in_bytes()}.
     */
    public final int arrayOopDescLengthOffset() {
        return useCompressedClassPointers ? hubOffset + narrowKlassSize : arrayOopDescSize;
    }

    public final int arrayU1LengthOffset = getFieldOffset("Array<int>::_length", Integer.class, "int");
    public final int arrayU1DataOffset = getFieldOffset("Array<u1>::_data", Integer.class);
    public final int arrayU2DataOffset = getFieldOffset("Array<u2>::_data", Integer.class);
    public final int metaspaceArrayLengthOffset = getFieldOffset("Array<Klass*>::_length", Integer.class, "int");
    public final int metaspaceArrayBaseOffset = getFieldOffset("Array<Klass*>::_data[0]", Integer.class, "Klass*");

    public final int arrayClassElementOffset = getFieldOffset("ObjArrayKlass::_element_klass", Integer.class, "Klass*");

    public final int fieldInfoAccessFlagsOffset = getConstant("FieldInfo::access_flags_offset", Integer.class);
    public final int fieldInfoNameIndexOffset = getConstant("FieldInfo::name_index_offset", Integer.class);
    public final int fieldInfoSignatureIndexOffset = getConstant("FieldInfo::signature_index_offset", Integer.class);
    public final int fieldInfoInitvalIndexOffset = getConstant("FieldInfo::initval_index_offset", Integer.class);
    public final int fieldInfoLowPackedOffset = getConstant("FieldInfo::low_packed_offset", Integer.class);
    public final int fieldInfoHighPackedOffset = getConstant("FieldInfo::high_packed_offset", Integer.class);
    public final int fieldInfoFieldSlots = getConstant("FieldInfo::field_slots", Integer.class);

    public final int fieldInfoTagSize = getConstant("FIELDINFO_TAG_SIZE", Integer.class);

    public final int jvmAccMonitorMatch = getConstant("JVM_ACC_MONITOR_MATCH", Integer.class);
    public final int jvmAccHasMonitorBytecodes = getConstant("JVM_ACC_HAS_MONITOR_BYTECODES", Integer.class);
    public final int jvmAccHasFinalizer = getConstant("JVM_ACC_HAS_FINALIZER", Integer.class);
    public final int jvmAccFieldInternal = getConstant("JVM_ACC_FIELD_INTERNAL", Integer.class);
    public final int jvmAccFieldStable = getConstant("JVM_ACC_FIELD_STABLE", Integer.class);
    public final int jvmAccFieldHasGenericSignature = getConstant("JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE", Integer.class);
    public final int jvmAccWrittenFlags = getConstant("JVM_ACC_WRITTEN_FLAGS", Integer.class);
    public final int jvmAccSynthetic = getConstant("JVM_ACC_SYNTHETIC", Integer.class);

    public final int jvmciCompileStateCanPostOnExceptionsOffset = getFieldOffset("JVMCIEnv::_jvmti_can_post_on_exceptions", Integer.class, "jbyte", Integer.MIN_VALUE);

    public final int threadTlabOffset = getFieldOffset("Thread::_tlab", Integer.class, "ThreadLocalAllocBuffer");
    public final int javaThreadAnchorOffset = getFieldOffset("JavaThread::_anchor", Integer.class, "JavaFrameAnchor");
    public final int javaThreadShouldPostOnExceptionsFlagOffset = getFieldOffset("JavaThread::_should_post_on_exceptions_flag", Integer.class, "int", Integer.MIN_VALUE);
    public final int threadObjectOffset = getFieldOffset("JavaThread::_threadObj", Integer.class, "oop");
    public final int osThreadOffset = getFieldOffset("JavaThread::_osthread", Integer.class, "OSThread*");
    public final int threadIsMethodHandleReturnOffset = getFieldOffset("JavaThread::_is_method_handle_return", Integer.class, "int");
    public final int threadObjectResultOffset = getFieldOffset("JavaThread::_vm_result", Integer.class, "oop");
    public final int jvmciCountersThreadOffset = getFieldOffset("JavaThread::_jvmci_counters", Integer.class, "jlong*");
    public final int javaThreadReservedStackActivationOffset = versioned.javaThreadReservedStackActivationOffset;

    public boolean requiresReservedStackCheck(List<ResolvedJavaMethod> methods) {
        if (enableStackReservedZoneAddress != 0 && methods != null) {
            for (ResolvedJavaMethod method : methods) {
                if (((HotSpotResolvedJavaMethod) method).hasReservedStackAccess()) {
                    return true;
                }
            }
        }
        return false;
    }

    
An invalid value for rtldDefault. /**
     * An invalid value for {@link #rtldDefault}.
     */
    public static final long INVALID_RTLD_DEFAULT_HANDLE = 0xDEADFACE;

    
Address of the library lookup routine. The C signature of this routine is:
    void* (const char *filename, char *ebuf, int ebuflen)

/**
     * Address of the library lookup routine. The C signature of this routine is:
     *
     * <pre>
     *     void* (const char *filename, char *ebuf, int ebuflen)
     * </pre>
     */
    public final long dllLoad = getAddress("os::dll_load");

    
Address of the library lookup routine. The C signature of this routine is:
    void* (void* handle, const char* name)

/**
     * Address of the library lookup routine. The C signature of this routine is:
     *
     * <pre>
     *     void* (void* handle, const char* name)
     * </pre>
     */
    public final long dllLookup = getAddress("os::dll_lookup");

    
A pseudo-handle which when used as the first argument to dllLookup means lookup will return the first occurrence of the desired symbol using the default library search order. If this field is -559023410, then this capability is not supported on the current platform. /**
     * A pseudo-handle which when used as the first argument to {@link #dllLookup} means lookup will
     * return the first occurrence of the desired symbol using the default library search order. If
     * this field is {@value #INVALID_RTLD_DEFAULT_HANDLE}, then this capability is not supported on
     * the current platform.
     */
    public final long rtldDefault = getAddress("RTLD_DEFAULT", osName.equals("bsd") || osName.equals("linux") ? null : INVALID_RTLD_DEFAULT_HANDLE);

    
This field is used to pass exception objects into and out of the runtime system during
exception handling for compiled code.
/**
     * This field is used to pass exception objects into and out of the runtime system during
     * exception handling for compiled code.
     */
    public final int threadExceptionOopOffset = getFieldOffset("JavaThread::_exception_oop", Integer.class, "oop");
    public final int threadExceptionPcOffset = getFieldOffset("JavaThread::_exception_pc", Integer.class, "address");
    public final int pendingExceptionOffset = getFieldOffset("ThreadShadow::_pending_exception", Integer.class, "oop");

    public final int pendingDeoptimizationOffset = getFieldOffset("JavaThread::_pending_deoptimization", Integer.class, "int");
    public final int pendingFailedSpeculationOffset = getFieldOffset("JavaThread::_pending_failed_speculation", Integer.class, "long");
    public final int pendingTransferToInterpreterOffset = getFieldOffset("JavaThread::_pending_transfer_to_interpreter", Integer.class, "bool");

    private final int javaFrameAnchorLastJavaSpOffset = getFieldOffset("JavaFrameAnchor::_last_Java_sp", Integer.class, "intptr_t*");
    private final int javaFrameAnchorLastJavaPcOffset = getFieldOffset("JavaFrameAnchor::_last_Java_pc", Integer.class, "address");

    public int threadLastJavaSpOffset() {
        return javaThreadAnchorOffset + javaFrameAnchorLastJavaSpOffset;
    }

    public int threadLastJavaPcOffset() {
        return javaThreadAnchorOffset + javaFrameAnchorLastJavaPcOffset;
    }

    public int threadLastJavaFpOffset() {
        assert osArch.equals("aarch64") || osArch.equals("amd64");
        return javaThreadAnchorOffset + getFieldOffset("JavaFrameAnchor::_last_Java_fp", Integer.class, "intptr_t*");
    }

    public int threadJavaFrameAnchorFlagsOffset() {
        assert osArch.equals("sparc");
        return javaThreadAnchorOffset + getFieldOffset("JavaFrameAnchor::_flags", Integer.class, "int");
    }

    public final int runtimeCallStackSize = getConstant("frame::arg_reg_save_area_bytes", Integer.class, intRequiredOnAMD64);
    public final int frameInterpreterFrameSenderSpOffset = getConstant("frame::interpreter_frame_sender_sp_offset", Integer.class, intRequiredOnAMD64);
    public final int frameInterpreterFrameLastSpOffset = getConstant("frame::interpreter_frame_last_sp_offset", Integer.class, intRequiredOnAMD64);

    public final int osThreadInterruptedOffset = getFieldOffset("OSThread::_interrupted", Integer.class, "jint");

    public final long markOopDescHashShift = getConstant("markOopDesc::hash_shift", Long.class);

    public final int biasedLockMaskInPlace = getConstant("markOopDesc::biased_lock_mask_in_place", Integer.class);
    public final int ageMaskInPlace = getConstant("markOopDesc::age_mask_in_place", Integer.class);
    public final int epochMaskInPlace = getConstant("markOopDesc::epoch_mask_in_place", Integer.class);
    public final long markOopDescHashMask = getConstant("markOopDesc::hash_mask", Long.class);
    public final long markOopDescHashMaskInPlace = getConstant("markOopDesc::hash_mask_in_place", Long.class);

    public final int unlockedMask = getConstant("markOopDesc::unlocked_value", Integer.class);
    public final int monitorMask = getConstant("markOopDesc::monitor_value", Integer.class, -1);
    public final int biasedLockPattern = getConstant("markOopDesc::biased_lock_pattern", Integer.class);

    // This field has no type in vmStructs.cpp
    public final int objectMonitorOwner = getFieldOffset("ObjectMonitor::_owner", Integer.class, null, -1);
    public final int objectMonitorRecursions = getFieldOffset("ObjectMonitor::_recursions", Integer.class, "intptr_t", -1);
    public final int objectMonitorCxq = getFieldOffset("ObjectMonitor::_cxq", Integer.class, "ObjectWaiter*", -1);
    public final int objectMonitorEntryList = getFieldOffset("ObjectMonitor::_EntryList", Integer.class, "ObjectWaiter*", -1);

    public final int markWordNoHashInPlace = getConstant("markOopDesc::no_hash_in_place", Integer.class);
    public final int markWordNoLockInPlace = getConstant("markOopDesc::no_lock_in_place", Integer.class);

    
See markOopDesc::prototype(). /**
     * See {@code markOopDesc::prototype()}.
     */
    public long arrayPrototypeMarkWord() {
        return markWordNoHashInPlace | markWordNoLockInPlace;
    }

    
See markOopDesc::copy_set_hash(). /**
     * See {@code markOopDesc::copy_set_hash()}.
     */
    public long tlabIntArrayMarkWord() {
        long tmp = arrayPrototypeMarkWord() & (~markOopDescHashMaskInPlace);
        tmp |= ((0x2 & markOopDescHashMask) << markOopDescHashShift);
        return tmp;
    }

    
Mark word right shift to get identity hash code.
/**
     * Mark word right shift to get identity hash code.
     */
    public final int identityHashCodeShift = getConstant("markOopDesc::hash_shift", Integer.class);

    
Identity hash code value when uninitialized.
/**
     * Identity hash code value when uninitialized.
     */
    public final int uninitializedIdentityHashCodeValue = getConstant("markOopDesc::no_hash", Integer.class);

    public final int methodAccessFlagsOffset = getFieldOffset("Method::_access_flags", Integer.class, "AccessFlags");
    public final int methodConstMethodOffset = getFieldOffset("Method::_constMethod", Integer.class, "ConstMethod*");
    public final int methodIntrinsicIdOffset = versioned.methodIntrinsicIdOffset;
    public final int methodFlagsOffset = versioned.methodFlagsOffset;
    public final int methodVtableIndexOffset = getFieldOffset("Method::_vtable_index", Integer.class, "int");

    public final int methodCountersOffset = getFieldOffset("Method::_method_counters", Integer.class, "MethodCounters*");
    public final int methodDataOffset = getFieldOffset("Method::_method_data", Integer.class, "MethodData*");
    public final int methodCompiledEntryOffset = getFieldOffset("Method::_from_compiled_entry", Integer.class, "address");
    public final int methodCodeOffset = versioned.methodCodeOffset;

    public final int methodFlagsCallerSensitive = getConstant("Method::_caller_sensitive", Integer.class);
    public final int methodFlagsForceInline = getConstant("Method::_force_inline", Integer.class);
    public final int methodFlagsDontInline = getConstant("Method::_dont_inline", Integer.class);
    public final int methodFlagsHidden = getConstant("Method::_hidden", Integer.class);
    public final int nonvirtualVtableIndex = getConstant("Method::nonvirtual_vtable_index", Integer.class);
    public final int invalidVtableIndex = getConstant("Method::invalid_vtable_index", Integer.class);

    public final int invocationCounterOffset = getFieldOffset("MethodCounters::_invocation_counter", Integer.class, "InvocationCounter");
    public final int backedgeCounterOffset = getFieldOffset("MethodCounters::_backedge_counter", Integer.class, "InvocationCounter");
    public final int invocationCounterIncrement = versioned.invocationCounterIncrement;
    public final int invocationCounterShift = versioned.invocationCounterShift;

    public final int nmethodEntryOffset = getFieldOffset("nmethod::_verified_entry_point",
                    Integer.class, "address");
    public final int compilationLevelFullOptimization = getConstant("CompLevel_full_optimization",
                    Integer.class);

    public final int constantPoolSize = getFieldValue("CompilerToVM::Data::sizeof_ConstantPool", Integer.class, "int");
    public final int constantPoolLengthOffset = getFieldOffset("ConstantPool::_length",
                    Integer.class, "int");

    public final int heapWordSize = getConstant("HeapWordSize", Integer.class);

    
Bit pattern that represents a non-oop. Neither the high bits nor the low bits of this value
are allowed to look like (respectively) the high or low bits of a real oop.
/**
     * Bit pattern that represents a non-oop. Neither the high bits nor the low bits of this value
     * are allowed to look like (respectively) the high or low bits of a real oop.
     */
    public final long nonOopBits = getFieldValue("CompilerToVM::Data::Universe_non_oop_bits", Long.class, "void*");

    public final long verifyOopCounterAddress = getFieldAddress("StubRoutines::_verify_oop_count", "jint");
    public final long verifyOopMask = getFieldValue("CompilerToVM::Data::Universe_verify_oop_mask", Long.class, "uintptr_t");
    public final long verifyOopBits = getFieldValue("CompilerToVM::Data::Universe_verify_oop_bits", Long.class, "uintptr_t");

    public final int logOfHRGrainBytes = getFieldValue("HeapRegion::LogOfHRGrainBytes", Integer.class, "int");

    public final long cardtableStartAddress = getFieldValue("CompilerToVM::Data::cardtable_start_address", Long.class, "jbyte*");
    public final int cardtableShift = getFieldValue("CompilerToVM::Data::cardtable_shift", Integer.class, "int");

    
This is the largest stack offset encodeable in an OopMapValue. Offsets larger than this will
throw an exception during code installation.
/**
     * This is the largest stack offset encodeable in an OopMapValue. Offsets larger than this will
     * throw an exception during code installation.
     */
    public final int maxOopMapStackOffset = getFieldValue("CompilerToVM::Data::_max_oop_map_stack_offset", Integer.class, "int");

    public final long safepointPollingAddress = getFieldValue("os::_polling_page", Long.class, "address");

    // G1 Collector Related Values.

    public final byte dirtyCardValue = versioned.dirtyCardValue;
    public final byte g1YoungCardValue = versioned.g1YoungCardValue;

    public final int g1SATBQueueMarkingOffset = versioned.g1SATBQueueMarkingOffset;
    public final int g1SATBQueueIndexOffset = versioned.g1SATBQueueIndexOffset;
    public final int g1SATBQueueBufferOffset = versioned.g1SATBQueueBufferOffset;
    public final int g1CardQueueIndexOffset = versioned.g1CardQueueIndexOffset;
    public final int g1CardQueueBufferOffset = versioned.g1CardQueueBufferOffset;

    public final int klassOffset = getFieldValue("java_lang_Class::_klass_offset", Integer.class, "int");
    public final int arrayKlassOffset = getFieldValue("java_lang_Class::_array_klass_offset", Integer.class, "int");

    public final int basicLockSize = getFieldValue("CompilerToVM::Data::sizeof_BasicLock", Integer.class, "int");
    public final int basicLockDisplacedHeaderOffset = getFieldOffset("BasicLock::_displaced_header", Integer.class, "markOop");

    public final int threadPollingPageOffset = getFieldOffset("Thread::_polling_page", Integer.class, "address", -1);
    public final int threadAllocatedBytesOffset = getFieldOffset("Thread::_allocated_bytes", Integer.class, "jlong");

    public final int tlabRefillWasteIncrement = getFlag("TLABWasteIncrement", Integer.class);

    private final int threadLocalAllocBufferStartOffset = getFieldOffset("ThreadLocalAllocBuffer::_start", Integer.class, "HeapWord*");
    private final int threadLocalAllocBufferEndOffset = getFieldOffset("ThreadLocalAllocBuffer::_end", Integer.class, "HeapWord*");
    private final int threadLocalAllocBufferTopOffset = getFieldOffset("ThreadLocalAllocBuffer::_top", Integer.class, "HeapWord*");
    private final int threadLocalAllocBufferPfTopOffset = getFieldOffset("ThreadLocalAllocBuffer::_pf_top", Integer.class, "HeapWord*");
    private final int threadLocalAllocBufferSlowAllocationsOffset = getFieldOffset("ThreadLocalAllocBuffer::_slow_allocations", Integer.class, "unsigned");
    private final int threadLocalAllocBufferFastRefillWasteOffset = getFieldOffset("ThreadLocalAllocBuffer::_fast_refill_waste", Integer.class, "unsigned");
    private final int threadLocalAllocBufferNumberOfRefillsOffset = getFieldOffset("ThreadLocalAllocBuffer::_number_of_refills", Integer.class, "unsigned");
    private final int threadLocalAllocBufferRefillWasteLimitOffset = getFieldOffset("ThreadLocalAllocBuffer::_refill_waste_limit", Integer.class, "size_t");
    private final int threadLocalAllocBufferDesiredSizeOffset = getFieldOffset("ThreadLocalAllocBuffer::_desired_size", Integer.class, "size_t");

    public int tlabSlowAllocationsOffset() {
        return threadTlabOffset + threadLocalAllocBufferSlowAllocationsOffset;
    }

    public int tlabFastRefillWasteOffset() {
        return threadTlabOffset + threadLocalAllocBufferFastRefillWasteOffset;
    }

    public int tlabNumberOfRefillsOffset() {
        return threadTlabOffset + threadLocalAllocBufferNumberOfRefillsOffset;
    }

    public int tlabRefillWasteLimitOffset() {
        return threadTlabOffset + threadLocalAllocBufferRefillWasteLimitOffset;
    }

    public int threadTlabSizeOffset() {
        return threadTlabOffset + threadLocalAllocBufferDesiredSizeOffset;
    }

    public int threadTlabStartOffset() {
        return threadTlabOffset + threadLocalAllocBufferStartOffset;
    }

    public int threadTlabEndOffset() {
        return threadTlabOffset + threadLocalAllocBufferEndOffset;
    }

    public int threadTlabTopOffset() {
        return threadTlabOffset + threadLocalAllocBufferTopOffset;
    }

    public int threadTlabPfTopOffset() {
        return threadTlabOffset + threadLocalAllocBufferPfTopOffset;
    }

    public final int tlabAlignmentReserve = getFieldValue("CompilerToVM::Data::ThreadLocalAllocBuffer_alignment_reserve", Integer.class, "size_t");

    public final boolean tlabStats = getFlag("TLABStats", Boolean.class);

    // FIXME This is only temporary until the GC code is changed.
    public final boolean inlineContiguousAllocationSupported = getFieldValue("CompilerToVM::Data::_supports_inline_contig_alloc", Boolean.class);
    public final long heapEndAddress = getFieldValue("CompilerToVM::Data::_heap_end_addr", Long.class, "HeapWord**");
    public final long heapTopAddress = versioned.heapTopAddress;

    public final boolean cmsIncrementalMode = getFlag("CMSIncrementalMode", Boolean.class, false);

    public final long inlineCacheMissStub = getFieldValue("CompilerToVM::Data::SharedRuntime_ic_miss_stub", Long.class, "address");
    public final long handleWrongMethodStub = getFieldValue("CompilerToVM::Data::SharedRuntime_handle_wrong_method_stub", Long.class, "address");

    public final long handleDeoptStub = getFieldValue("CompilerToVM::Data::SharedRuntime_deopt_blob_unpack", Long.class, "address");
    public final long uncommonTrapStub = getFieldValue("CompilerToVM::Data::SharedRuntime_deopt_blob_uncommon_trap", Long.class, "address");

    public final long codeCacheLowBound = versioned.codeCacheLowBound;
    public final long codeCacheHighBound = versioned.codeCacheHighBound;

    public final long aescryptEncryptBlockStub = getFieldValue("StubRoutines::_aescrypt_encryptBlock", Long.class, "address");
    public final long aescryptDecryptBlockStub = getFieldValue("StubRoutines::_aescrypt_decryptBlock", Long.class, "address");
    public final long cipherBlockChainingEncryptAESCryptStub = getFieldValue("StubRoutines::_cipherBlockChaining_encryptAESCrypt", Long.class, "address");
    public final long cipherBlockChainingDecryptAESCryptStub = getFieldValue("StubRoutines::_cipherBlockChaining_decryptAESCrypt", Long.class, "address");
    public final long updateBytesCRC32Stub = getFieldValue("StubRoutines::_updateBytesCRC32", Long.class, "address");
    public final long crcTableAddress = getFieldValue("StubRoutines::_crc_table_adr", Long.class, "address");

    public final long sha1ImplCompress = getFieldValue("StubRoutines::_sha1_implCompress", Long.class, "address", 0L);
    public final long sha1ImplCompressMB = getFieldValue("StubRoutines::_sha1_implCompressMB", Long.class, "address", 0L);
    public final long sha256ImplCompress = getFieldValue("StubRoutines::_sha256_implCompress", Long.class, "address", 0L);
    public final long sha256ImplCompressMB = getFieldValue("StubRoutines::_sha256_implCompressMB", Long.class, "address", 0L);
    public final long sha512ImplCompress = getFieldValue("StubRoutines::_sha512_implCompress", Long.class, "address", 0L);
    public final long sha512ImplCompressMB = getFieldValue("StubRoutines::_sha512_implCompressMB", Long.class, "address", 0L);
    public final long multiplyToLen = getFieldValue("StubRoutines::_multiplyToLen", Long.class, "address", longRequiredOnAMD64);

    public final long counterModeAESCrypt = getFieldValue("StubRoutines::_counterMode_AESCrypt", Long.class, "address", 0L);
    public final long ghashProcessBlocks = getFieldValue("StubRoutines::_ghash_processBlocks", Long.class, "address", 0L);
    public final long crc32cTableTddr = getFieldValue("StubRoutines::_crc32c_table_addr", Long.class, "address", 0L);
    public final long updateBytesCRC32C = getFieldValue("StubRoutines::_updateBytesCRC32C", Long.class, "address", 0L);
    public final long updateBytesAdler32 = getFieldValue("StubRoutines::_updateBytesAdler32", Long.class, "address", 0L);
    public final long squareToLen = getFieldValue("StubRoutines::_squareToLen", Long.class, "address", longRequiredOnAMD64);
    public final long mulAdd = getFieldValue("StubRoutines::_mulAdd", Long.class, "address", longRequiredOnAMD64);
    public final long montgomeryMultiply = getFieldValue("StubRoutines::_montgomeryMultiply", Long.class, "address", longRequiredOnAMD64);
    public final long montgomerySquare = getFieldValue("StubRoutines::_montgomerySquare", Long.class, "address", longRequiredOnAMD64);
    public final long vectorizedMismatch = getFieldValue("StubRoutines::_vectorizedMismatch", Long.class, "address", 0L);

    public final long throwDelayedStackOverflowErrorEntry = versioned.throwDelayedStackOverflowErrorEntry;

    public final long jbyteArraycopy = getFieldValue("StubRoutines::_jbyte_arraycopy", Long.class, "address");
    public final long jshortArraycopy = getFieldValue("StubRoutines::_jshort_arraycopy", Long.class, "address");
    public final long jintArraycopy = getFieldValue("StubRoutines::_jint_arraycopy", Long.class, "address");
    public final long jlongArraycopy = getFieldValue("StubRoutines::_jlong_arraycopy", Long.class, "address");
    public final long oopArraycopy = getFieldValue("StubRoutines::_oop_arraycopy", Long.class, "address");
    public final long oopArraycopyUninit = getFieldValue("StubRoutines::_oop_arraycopy_uninit", Long.class, "address");
    public final long jbyteDisjointArraycopy = getFieldValue("StubRoutines::_jbyte_disjoint_arraycopy", Long.class, "address");
    public final long jshortDisjointArraycopy = getFieldValue("StubRoutines::_jshort_disjoint_arraycopy", Long.class, "address");
    public final long jintDisjointArraycopy = getFieldValue("StubRoutines::_jint_disjoint_arraycopy", Long.class, "address");
    public final long jlongDisjointArraycopy = getFieldValue("StubRoutines::_jlong_disjoint_arraycopy", Long.class, "address");
    public final long oopDisjointArraycopy = getFieldValue("StubRoutines::_oop_disjoint_arraycopy", Long.class, "address");
    public final long oopDisjointArraycopyUninit = getFieldValue("StubRoutines::_oop_disjoint_arraycopy_uninit", Long.class, "address");
    public final long jbyteAlignedArraycopy = getFieldValue("StubRoutines::_arrayof_jbyte_arraycopy", Long.class, "address");
    public final long jshortAlignedArraycopy = getFieldValue("StubRoutines::_arrayof_jshort_arraycopy", Long.class, "address");
    public final long jintAlignedArraycopy = getFieldValue("StubRoutines::_arrayof_jint_arraycopy", Long.class, "address");
    public final long jlongAlignedArraycopy = getFieldValue("StubRoutines::_arrayof_jlong_arraycopy", Long.class, "address");
    public final long oopAlignedArraycopy = getFieldValue("StubRoutines::_arrayof_oop_arraycopy", Long.class, "address");
    public final long oopAlignedArraycopyUninit = getFieldValue("StubRoutines::_arrayof_oop_arraycopy_uninit", Long.class, "address");
    public final long jbyteAlignedDisjointArraycopy = getFieldValue("StubRoutines::_arrayof_jbyte_disjoint_arraycopy", Long.class, "address");
    public final long jshortAlignedDisjointArraycopy = getFieldValue("StubRoutines::_arrayof_jshort_disjoint_arraycopy", Long.class, "address");
    public final long jintAlignedDisjointArraycopy = getFieldValue("StubRoutines::_arrayof_jint_disjoint_arraycopy", Long.class, "address");
    public final long jlongAlignedDisjointArraycopy = getFieldValue("StubRoutines::_arrayof_jlong_disjoint_arraycopy", Long.class, "address");
    public final long oopAlignedDisjointArraycopy = getFieldValue("StubRoutines::_arrayof_oop_disjoint_arraycopy", Long.class, "address");
    public final long oopAlignedDisjointArraycopyUninit = getFieldValue("StubRoutines::_arrayof_oop_disjoint_arraycopy_uninit", Long.class, "address");
    public final long checkcastArraycopy = getFieldValue("StubRoutines::_checkcast_arraycopy", Long.class, "address");
    public final long checkcastArraycopyUninit = getFieldValue("StubRoutines::_checkcast_arraycopy_uninit", Long.class, "address");
    public final long unsafeArraycopy = getFieldValue("StubRoutines::_unsafe_arraycopy", Long.class, "address");
    public final long genericArraycopy = getFieldValue("StubRoutines::_generic_arraycopy", Long.class, "address");

    // Allocation stubs that throw an exception when allocation fails
    public final long newInstanceAddress = getAddress("JVMCIRuntime::new_instance");
    public final long newArrayAddress = getAddress("JVMCIRuntime::new_array");
    public final long newMultiArrayAddress = getAddress("JVMCIRuntime::new_multi_array");
    public final long dynamicNewInstanceAddress = getAddress("JVMCIRuntime::dynamic_new_instance");

    // Allocation stubs that return null when allocation fails
    public final long newInstanceOrNullAddress = getAddress("JVMCIRuntime::new_instance_or_null", 0L);
    public final long newArrayOrNullAddress = getAddress("JVMCIRuntime::new_array_or_null", 0L);
    public final long newMultiArrayOrNullAddress = getAddress("JVMCIRuntime::new_multi_array_or_null", 0L);
    public final long dynamicNewInstanceOrNullAddress = getAddress("JVMCIRuntime::dynamic_new_instance_or_null", 0L);

    public boolean areNullAllocationStubsAvailable() {
        return newInstanceOrNullAddress != 0L;
    }

    
Checks that HotSpot implements all or none of the allocate-or-null stubs.
/**
     * Checks that HotSpot implements all or none of the allocate-or-null stubs.
     */
    private boolean checkNullAllocationStubs() {
        if (newInstanceOrNullAddress == 0L) {
            assert newArrayOrNullAddress == 0L;
            assert newMultiArrayOrNullAddress == 0L;
            assert dynamicNewInstanceOrNullAddress == 0L;
        } else {
            assert newArrayOrNullAddress != 0L;
            assert newMultiArrayOrNullAddress != 0L;
            assert dynamicNewInstanceOrNullAddress != 0L;
        }
        return true;
    }

    public final long threadIsInterruptedAddress = getAddress("JVMCIRuntime::thread_is_interrupted");
    public final long vmMessageAddress = getAddress("JVMCIRuntime::vm_message");
    public final long identityHashCodeAddress = getAddress("JVMCIRuntime::identity_hash_code");
    public final long exceptionHandlerForPcAddress = getAddress("JVMCIRuntime::exception_handler_for_pc");
    public final long monitorenterAddress = getAddress("JVMCIRuntime::monitorenter");
    public final long monitorexitAddress = getAddress("JVMCIRuntime::monitorexit");
    public final long notifyAddress = getAddress("JVMCIRuntime::object_notify", 0L);
    public final long notifyAllAddress = getAddress("JVMCIRuntime::object_notifyAll", 0L);
    public final long throwAndPostJvmtiExceptionAddress = getAddress("JVMCIRuntime::throw_and_post_jvmti_exception");
    public final long throwKlassExternalNameExceptionAddress = getAddress("JVMCIRuntime::throw_klass_external_name_exception");
    public final long throwClassCastExceptionAddress = getAddress("JVMCIRuntime::throw_class_cast_exception");
    public final long logPrimitiveAddress = getAddress("JVMCIRuntime::log_primitive");
    public final long logObjectAddress = getAddress("JVMCIRuntime::log_object");
    public final long logPrintfAddress = getAddress("JVMCIRuntime::log_printf");
    public final long vmErrorAddress = getAddress("JVMCIRuntime::vm_error");
    public final long loadAndClearExceptionAddress = getAddress("JVMCIRuntime::load_and_clear_exception");
    public final long writeBarrierPreAddress = getAddress("JVMCIRuntime::write_barrier_pre");
    public final long writeBarrierPostAddress = getAddress("JVMCIRuntime::write_barrier_post");
    public final long validateObject = getAddress("JVMCIRuntime::validate_object");

    public final long testDeoptimizeCallInt = getAddress("JVMCIRuntime::test_deoptimize_call_int");

    public final long registerFinalizerAddress = getAddress("SharedRuntime::register_finalizer");
    public final long exceptionHandlerForReturnAddressAddress = getAddress("SharedRuntime::exception_handler_for_return_address");
    public final long osrMigrationEndAddress = getAddress("SharedRuntime::OSR_migration_end");
    public final long enableStackReservedZoneAddress = versioned.enableStackReservedZoneAddress;

    public final long javaTimeMillisAddress = getAddress("os::javaTimeMillis");
    public final long javaTimeNanosAddress = getAddress("os::javaTimeNanos");
    public final long arithmeticSinAddress = getFieldValue("CompilerToVM::Data::dsin", Long.class, "address");
    public final long arithmeticCosAddress = getFieldValue("CompilerToVM::Data::dcos", Long.class, "address");
    public final long arithmeticTanAddress = getFieldValue("CompilerToVM::Data::dtan", Long.class, "address");
    public final long arithmeticExpAddress = getFieldValue("CompilerToVM::Data::dexp", Long.class, "address");
    public final long arithmeticLogAddress = getFieldValue("CompilerToVM::Data::dlog", Long.class, "address");
    public final long arithmeticLog10Address = getFieldValue("CompilerToVM::Data::dlog10", Long.class, "address");
    public final long arithmeticPowAddress = getFieldValue("CompilerToVM::Data::dpow", Long.class, "address");

    public final long fremAddress = getAddress("SharedRuntime::frem");
    public final long dremAddress = getAddress("SharedRuntime::drem");

    public final int jvmciCountersSize = getFlag("JVMCICounterSize", Integer.class);

    public final long deoptimizationFetchUnrollInfo = getAddress("Deoptimization::fetch_unroll_info");
    public final long deoptimizationUncommonTrap = getAddress("Deoptimization::uncommon_trap");
    public final long deoptimizationUnpackFrames = getAddress("Deoptimization::unpack_frames");

    public final int deoptimizationUnpackDeopt = getConstant("Deoptimization::Unpack_deopt", Integer.class);
    public final int deoptimizationUnpackException = getConstant("Deoptimization::Unpack_exception", Integer.class);
    public final int deoptimizationUnpackUncommonTrap = getConstant("Deoptimization::Unpack_uncommon_trap", Integer.class);
    public final int deoptimizationUnpackReexecute = getConstant("Deoptimization::Unpack_reexecute", Integer.class);

    public final int deoptimizationUnrollBlockSizeOfDeoptimizedFrameOffset = getFieldOffset("Deoptimization::UnrollBlock::_size_of_deoptimized_frame", Integer.class, "int");
    public final int deoptimizationUnrollBlockCallerAdjustmentOffset = getFieldOffset("Deoptimization::UnrollBlock::_caller_adjustment", Integer.class, "int");
    public final int deoptimizationUnrollBlockNumberOfFramesOffset = getFieldOffset("Deoptimization::UnrollBlock::_number_of_frames", Integer.class, "int");
    public final int deoptimizationUnrollBlockTotalFrameSizesOffset = getFieldOffset("Deoptimization::UnrollBlock::_total_frame_sizes", Integer.class, "int");
    public final int deoptimizationUnrollBlockUnpackKindOffset = getFieldOffset("Deoptimization::UnrollBlock::_unpack_kind", Integer.class, "int");
    public final int deoptimizationUnrollBlockFrameSizesOffset = getFieldOffset("Deoptimization::UnrollBlock::_frame_sizes", Integer.class, "intptr_t*");
    public final int deoptimizationUnrollBlockFramePcsOffset = getFieldOffset("Deoptimization::UnrollBlock::_frame_pcs", Integer.class, "address*");
    public final int deoptimizationUnrollBlockInitialInfoOffset = getFieldOffset("Deoptimization::UnrollBlock::_initial_info", Integer.class, "intptr_t");

    // Checkstyle: stop
    public final int MARKID_VERIFIED_ENTRY = getConstant("CodeInstaller::VERIFIED_ENTRY", Integer.class);
    public final int MARKID_UNVERIFIED_ENTRY = getConstant("CodeInstaller::UNVERIFIED_ENTRY", Integer.class);
    public final int MARKID_OSR_ENTRY = getConstant("CodeInstaller::OSR_ENTRY", Integer.class);
    public final int MARKID_EXCEPTION_HANDLER_ENTRY = getConstant("CodeInstaller::EXCEPTION_HANDLER_ENTRY", Integer.class);
    public final int MARKID_DEOPT_HANDLER_ENTRY = getConstant("CodeInstaller::DEOPT_HANDLER_ENTRY", Integer.class);
    public final int MARKID_INVOKEINTERFACE = getConstant("CodeInstaller::INVOKEINTERFACE", Integer.class);
    public final int MARKID_INVOKEVIRTUAL = getConstant("CodeInstaller::INVOKEVIRTUAL", Integer.class);
    public final int MARKID_INVOKESTATIC = getConstant("CodeInstaller::INVOKESTATIC", Integer.class);
    public final int MARKID_INVOKESPECIAL = getConstant("CodeInstaller::INVOKESPECIAL", Integer.class);
    public final int MARKID_INLINE_INVOKE = getConstant("CodeInstaller::INLINE_INVOKE", Integer.class);
    public final int MARKID_POLL_NEAR = getConstant("CodeInstaller::POLL_NEAR", Integer.class);
    public final int MARKID_POLL_RETURN_NEAR = getConstant("CodeInstaller::POLL_RETURN_NEAR", Integer.class);
    public final int MARKID_POLL_FAR = getConstant("CodeInstaller::POLL_FAR", Integer.class);
    public final int MARKID_POLL_RETURN_FAR = getConstant("CodeInstaller::POLL_RETURN_FAR", Integer.class);
    public final int MARKID_CARD_TABLE_SHIFT = getConstant("CodeInstaller::CARD_TABLE_SHIFT", Integer.class);
    public final int MARKID_CARD_TABLE_ADDRESS = getConstant("CodeInstaller::CARD_TABLE_ADDRESS", Integer.class);
    public final int MARKID_INVOKE_INVALID = getConstant("CodeInstaller::INVOKE_INVALID", Integer.class);

    
The following constants are given default values here since they are missing in the native JVMCI-8 code but are still required for GraalHotSpotVMConfigNode.canonical to work in a JDK8 environment. /**
     * The following constants are given default values here since they are missing in the native
     * JVMCI-8 code but are still required for {@link GraalHotSpotVMConfigNode#canonical} to work in
     * a JDK8 environment.
     */
    public final int MARKID_HEAP_TOP_ADDRESS = getConstant("CodeInstaller::HEAP_TOP_ADDRESS", Integer.class, 17);
    public final int MARKID_HEAP_END_ADDRESS = getConstant("CodeInstaller::HEAP_END_ADDRESS", Integer.class, 18);
    public final int MARKID_NARROW_KLASS_BASE_ADDRESS = getConstant("CodeInstaller::NARROW_KLASS_BASE_ADDRESS", Integer.class, 19);
    public final int MARKID_NARROW_OOP_BASE_ADDRESS = getConstant("CodeInstaller::NARROW_OOP_BASE_ADDRESS", Integer.class, 20);
    public final int MARKID_CRC_TABLE_ADDRESS = getConstant("CodeInstaller::CRC_TABLE_ADDRESS", Integer.class, 21);
    public final int MARKID_LOG_OF_HEAP_REGION_GRAIN_BYTES = getConstant("CodeInstaller::LOG_OF_HEAP_REGION_GRAIN_BYTES", Integer.class, 22);
    public final int MARKID_INLINE_CONTIGUOUS_ALLOCATION_SUPPORTED = getConstant("CodeInstaller::INLINE_CONTIGUOUS_ALLOCATION_SUPPORTED", Integer.class, 23);

    // Checkstyle: resume

    protected boolean check() {
        for (Field f : getClass().getDeclaredFields()) {
            int modifiers = f.getModifiers();
            if (Modifier.isPublic(modifiers) && !Modifier.isStatic(modifiers)) {
                assert Modifier.isFinal(modifiers) : "field should be final: " + f;
            }
        }

        assert codeEntryAlignment > 0 : codeEntryAlignment;
        assert checkNullAllocationStubs();
        return true;
    }
}