https://lucene.apache.org/lucene-parent/lucene-core: Apache Lucene Java Core (The Apache Software Foundation) 
public final class org.apache.lucene.util.IntBlockPool
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: org.apache.lucene.util.IntBlockPool
  super_class: java.lang.Object
{
  public static final int INT_BLOCK_SHIFT;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 13

  public static final int INT_BLOCK_SIZE;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 8192

  public static final int INT_BLOCK_MASK;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 8191

  public int[][] buffers;
    descriptor: [[I
    flags: (0x0001) ACC_PUBLIC

  private int bufferUpto;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

  public int intUpto;
    descriptor: I
    flags: (0x0001) ACC_PUBLIC

  public int[] buffer;
    descriptor: [I
    flags: (0x0001) ACC_PUBLIC

  public int intOffset;
    descriptor: I
    flags: (0x0001) ACC_PUBLIC

  private final org.apache.lucene.util.IntBlockPool$Allocator allocator;
    descriptor: Lorg/apache/lucene/util/IntBlockPool$Allocator;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private static final int[] NEXT_LEVEL_ARRAY;
    descriptor: [I
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final int[] LEVEL_SIZE_ARRAY;
    descriptor: [I
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final int FIRST_LEVEL_SIZE;
    descriptor: I
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  static final boolean $assertionsDisabled;
    descriptor: Z
    flags: (0x1018) ACC_STATIC, ACC_FINAL, ACC_SYNTHETIC

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=4, locals=0, args_size=0
         0: .line 26
            ldc Lorg/apache/lucene/util/IntBlockPool;
            invokevirtual java.lang.Class.desiredAssertionStatus:()Z
            ifne 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: putstatic org.apache.lucene.util.IntBlockPool.$assertionsDisabled:Z
         3: .line 193
            bipush 10
            newarray 10
            dup
            iconst_0
            iconst_1
            iastore
            dup
            iconst_1
            iconst_2
            iastore
            dup
            iconst_2
            iconst_3
            iastore
            dup
            iconst_3
            iconst_4
            iastore
            dup
            iconst_4
            iconst_5
            iastore
            dup
            iconst_5
            bipush 6
            iastore
            dup
            bipush 6
            bipush 7
            iastore
            dup
            bipush 7
            bipush 8
            iastore
            dup
            bipush 8
            bipush 9
            iastore
            dup
            bipush 9
            bipush 9
            iastore
            putstatic org.apache.lucene.util.IntBlockPool.NEXT_LEVEL_ARRAY:[I
         4: .line 198
            bipush 10
            newarray 10
            dup
            iconst_0
            iconst_2
            iastore
            dup
            iconst_1
            iconst_4
            iastore
            dup
            iconst_2
            bipush 8
            iastore
            dup
            iconst_3
            bipush 16
            iastore
            dup
            iconst_4
            bipush 32
            iastore
            dup
            iconst_5
            bipush 64
            iastore
            dup
            bipush 6
            sipush 128
            iastore
            dup
            bipush 7
            sipush 256
            iastore
            dup
            bipush 8
            sipush 512
            iastore
            dup
            bipush 9
            sipush 1024
            iastore
            putstatic org.apache.lucene.util.IntBlockPool.LEVEL_SIZE_ARRAY:[I
         5: .line 203
            getstatic org.apache.lucene.util.IntBlockPool.LEVEL_SIZE_ARRAY:[I
            iconst_0
            iaload
            putstatic org.apache.lucene.util.IntBlockPool.FIRST_LEVEL_SIZE:I
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.apache.lucene.util.IntBlockPool this
         0: .line 81
            aload 0 /* this */
            new org.apache.lucene.util.IntBlockPool$DirectAllocator
            dup
            invokespecial org.apache.lucene.util.IntBlockPool$DirectAllocator.<init>:()V
            invokespecial org.apache.lucene.util.IntBlockPool.<init>:(Lorg/apache/lucene/util/IntBlockPool$Allocator;)V
         1: .line 82
            return
        end local 0 // org.apache.lucene.util.IntBlockPool this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/lucene/util/IntBlockPool;

  public void <init>(org.apache.lucene.util.IntBlockPool$Allocator);
    descriptor: (Lorg/apache/lucene/util/IntBlockPool$Allocator;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.lucene.util.IntBlockPool this
        start local 1 // org.apache.lucene.util.IntBlockPool$Allocator allocator
         0: .line 88
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 63
            aload 0 /* this */
            bipush 10
            anewarray int[]
            putfield org.apache.lucene.util.IntBlockPool.buffers:[[I
         2: .line 66
            aload 0 /* this */
            iconst_m1
            putfield org.apache.lucene.util.IntBlockPool.bufferUpto:I
         3: .line 68
            aload 0 /* this */
            sipush 8192
            putfield org.apache.lucene.util.IntBlockPool.intUpto:I
         4: .line 72
            aload 0 /* this */
            sipush -8192
            putfield org.apache.lucene.util.IntBlockPool.intOffset:I
         5: .line 89
            aload 0 /* this */
            aload 1 /* allocator */
            putfield org.apache.lucene.util.IntBlockPool.allocator:Lorg/apache/lucene/util/IntBlockPool$Allocator;
         6: .line 90
            return
        end local 1 // org.apache.lucene.util.IntBlockPool$Allocator allocator
        end local 0 // org.apache.lucene.util.IntBlockPool this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    7     0       this  Lorg/apache/lucene/util/IntBlockPool;
            0    7     1  allocator  Lorg/apache/lucene/util/IntBlockPool$Allocator;
    MethodParameters:
           Name  Flags
      allocator  

  public void reset();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.apache.lucene.util.IntBlockPool this
         0: .line 97
            aload 0 /* this */
            iconst_1
            iconst_1
            invokevirtual org.apache.lucene.util.IntBlockPool.reset:(ZZ)V
         1: .line 98
            return
        end local 0 // org.apache.lucene.util.IntBlockPool this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/lucene/util/IntBlockPool;

  public void reset(boolean, boolean);
    descriptor: (ZZ)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=4, args_size=3
        start local 0 // org.apache.lucene.util.IntBlockPool this
        start local 1 // boolean zeroFillBuffers
        start local 2 // boolean reuseFirst
         0: .line 110
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.bufferUpto:I
            iconst_m1
            if_icmpeq 24
         1: .line 113
            iload 1 /* zeroFillBuffers */
            ifeq 8
         2: .line 114
            iconst_0
            istore 3 /* i */
        start local 3 // int i
         3: goto 6
         4: .line 116
      StackMap locals: int
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.buffers:[[I
            iload 3 /* i */
            aaload
            iconst_0
            invokestatic java.util.Arrays.fill:([II)V
         5: .line 114
            iinc 3 /* i */ 1
      StackMap locals:
      StackMap stack:
         6: iload 3 /* i */
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.bufferUpto:I
            if_icmplt 4
        end local 3 // int i
         7: .line 119
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.buffers:[[I
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.bufferUpto:I
            aaload
            iconst_0
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.intUpto:I
            iconst_0
            invokestatic java.util.Arrays.fill:([IIII)V
         8: .line 122
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.bufferUpto:I
            ifgt 9
            iload 2 /* reuseFirst */
            ifne 14
         9: .line 123
      StackMap locals:
      StackMap stack:
            iload 2 /* reuseFirst */
            ifeq 10
            iconst_1
            goto 11
      StackMap locals:
      StackMap stack:
        10: iconst_0
      StackMap locals:
      StackMap stack: int
        11: istore 3 /* offset */
        start local 3 // int offset
        12: .line 125
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.allocator:Lorg/apache/lucene/util/IntBlockPool$Allocator;
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.buffers:[[I
            iload 3 /* offset */
            iconst_1
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.bufferUpto:I
            iadd
            invokevirtual org.apache.lucene.util.IntBlockPool$Allocator.recycleIntBlocks:([[III)V
        13: .line 126
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.buffers:[[I
            iload 3 /* offset */
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.bufferUpto:I
            iconst_1
            iadd
            aconst_null
            invokestatic java.util.Arrays.fill:([Ljava/lang/Object;IILjava/lang/Object;)V
        end local 3 // int offset
        14: .line 128
      StackMap locals:
      StackMap stack:
            iload 2 /* reuseFirst */
            ifeq 20
        15: .line 130
            aload 0 /* this */
            iconst_0
            putfield org.apache.lucene.util.IntBlockPool.bufferUpto:I
        16: .line 131
            aload 0 /* this */
            iconst_0
            putfield org.apache.lucene.util.IntBlockPool.intUpto:I
        17: .line 132
            aload 0 /* this */
            iconst_0
            putfield org.apache.lucene.util.IntBlockPool.intOffset:I
        18: .line 133
            aload 0 /* this */
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.buffers:[[I
            iconst_0
            aaload
            putfield org.apache.lucene.util.IntBlockPool.buffer:[I
        19: .line 134
            goto 24
        20: .line 135
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            iconst_m1
            putfield org.apache.lucene.util.IntBlockPool.bufferUpto:I
        21: .line 136
            aload 0 /* this */
            sipush 8192
            putfield org.apache.lucene.util.IntBlockPool.intUpto:I
        22: .line 137
            aload 0 /* this */
            sipush -8192
            putfield org.apache.lucene.util.IntBlockPool.intOffset:I
        23: .line 138
            aload 0 /* this */
            aconst_null
            putfield org.apache.lucene.util.IntBlockPool.buffer:[I
        24: .line 141
      StackMap locals:
      StackMap stack:
            return
        end local 2 // boolean reuseFirst
        end local 1 // boolean zeroFillBuffers
        end local 0 // org.apache.lucene.util.IntBlockPool this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0   25     0             this  Lorg/apache/lucene/util/IntBlockPool;
            0   25     1  zeroFillBuffers  Z
            0   25     2       reuseFirst  Z
            3    7     3                i  I
           12   14     3           offset  I
    MethodParameters:
                 Name  Flags
      zeroFillBuffers  
      reuseFirst       

  public void nextBuffer();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=2, args_size=1
        start local 0 // org.apache.lucene.util.IntBlockPool this
         0: .line 150
            iconst_1
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.bufferUpto:I
            iadd
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.buffers:[[I
            arraylength
            if_icmpne 4
         1: .line 151
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.buffers:[[I
            arraylength
            i2d
            ldc 1.5
            dmul
            d2i
            anewarray int[]
            astore 1 /* newBuffers */
        start local 1 // int[][] newBuffers
         2: .line 152
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.buffers:[[I
            iconst_0
            aload 1 /* newBuffers */
            iconst_0
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.buffers:[[I
            arraylength
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
         3: .line 153
            aload 0 /* this */
            aload 1 /* newBuffers */
            putfield org.apache.lucene.util.IntBlockPool.buffers:[[I
        end local 1 // int[][] newBuffers
         4: .line 155
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.buffers:[[I
            iconst_1
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.bufferUpto:I
            iadd
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.allocator:Lorg/apache/lucene/util/IntBlockPool$Allocator;
            invokevirtual org.apache.lucene.util.IntBlockPool$Allocator.getIntBlock:()[I
            dup_x2
            aastore
            putfield org.apache.lucene.util.IntBlockPool.buffer:[I
         5: .line 156
            aload 0 /* this */
            dup
            getfield org.apache.lucene.util.IntBlockPool.bufferUpto:I
            iconst_1
            iadd
            putfield org.apache.lucene.util.IntBlockPool.bufferUpto:I
         6: .line 158
            aload 0 /* this */
            iconst_0
            putfield org.apache.lucene.util.IntBlockPool.intUpto:I
         7: .line 159
            aload 0 /* this */
            dup
            getfield org.apache.lucene.util.IntBlockPool.intOffset:I
            sipush 8192
            iadd
            putfield org.apache.lucene.util.IntBlockPool.intOffset:I
         8: .line 160
            return
        end local 0 // org.apache.lucene.util.IntBlockPool this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    9     0        this  Lorg/apache/lucene/util/IntBlockPool;
            2    4     1  newBuffers  [[I

  private int newSlice(int);
    descriptor: (I)I
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // org.apache.lucene.util.IntBlockPool this
        start local 1 // int size
         0: .line 167
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.intUpto:I
            sipush 8192
            iload 1 /* size */
            isub
            if_icmple 3
         1: .line 168
            aload 0 /* this */
            invokevirtual org.apache.lucene.util.IntBlockPool.nextBuffer:()V
         2: .line 169
            getstatic org.apache.lucene.util.IntBlockPool.$assertionsDisabled:Z
            ifne 3
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.buffer:[I
            invokestatic org.apache.lucene.util.IntBlockPool.assertSliceBuffer:([I)Z
            ifne 3
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         3: .line 172
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.intUpto:I
            istore 2 /* upto */
        start local 2 // int upto
         4: .line 173
            aload 0 /* this */
            dup
            getfield org.apache.lucene.util.IntBlockPool.intUpto:I
            iload 1 /* size */
            iadd
            putfield org.apache.lucene.util.IntBlockPool.intUpto:I
         5: .line 174
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.buffer:[I
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.intUpto:I
            iconst_1
            isub
            iconst_1
            iastore
         6: .line 175
            iload 2 /* upto */
            ireturn
        end local 2 // int upto
        end local 1 // int size
        end local 0 // org.apache.lucene.util.IntBlockPool this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0  this  Lorg/apache/lucene/util/IntBlockPool;
            0    7     1  size  I
            4    7     2  upto  I
    MethodParameters:
      Name  Flags
      size  final

  private static boolean assertSliceBuffer(int[]);
    descriptor: ([I)Z
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=3, locals=3, args_size=1
        start local 0 // int[] buffer
         0: .line 179
            iconst_0
            istore 1 /* count */
        start local 1 // int count
         1: .line 180
            iconst_0
            istore 2 /* i */
        start local 2 // int i
         2: goto 5
         3: .line 181
      StackMap locals: int int
      StackMap stack:
            iload 1 /* count */
            aload 0 /* buffer */
            iload 2 /* i */
            iaload
            iadd
            istore 1 /* count */
         4: .line 180
            iinc 2 /* i */ 1
      StackMap locals:
      StackMap stack:
         5: iload 2 /* i */
            aload 0 /* buffer */
            arraylength
            if_icmplt 3
        end local 2 // int i
         6: .line 183
            iload 1 /* count */
            ifne 7
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         7: iconst_0
            ireturn
        end local 1 // int count
        end local 0 // int[] buffer
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    8     0  buffer  [I
            1    8     1   count  I
            2    6     2       i  I
    MethodParameters:
        Name  Flags
      buffer  

  private int allocSlice(int[], int);
    descriptor: ([II)I
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=8, args_size=3
        start local 0 // org.apache.lucene.util.IntBlockPool this
        start local 1 // int[] slice
        start local 2 // int sliceOffset
         0: .line 209
            aload 1 /* slice */
            iload 2 /* sliceOffset */
            iaload
            istore 3 /* level */
        start local 3 // int level
         1: .line 210
            getstatic org.apache.lucene.util.IntBlockPool.NEXT_LEVEL_ARRAY:[I
            iload 3 /* level */
            iconst_1
            isub
            iaload
            istore 4 /* newLevel */
        start local 4 // int newLevel
         2: .line 211
            getstatic org.apache.lucene.util.IntBlockPool.LEVEL_SIZE_ARRAY:[I
            iload 4 /* newLevel */
            iaload
            istore 5 /* newSize */
        start local 5 // int newSize
         3: .line 213
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.intUpto:I
            sipush 8192
            iload 5 /* newSize */
            isub
            if_icmple 6
         4: .line 214
            aload 0 /* this */
            invokevirtual org.apache.lucene.util.IntBlockPool.nextBuffer:()V
         5: .line 215
            getstatic org.apache.lucene.util.IntBlockPool.$assertionsDisabled:Z
            ifne 6
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.buffer:[I
            invokestatic org.apache.lucene.util.IntBlockPool.assertSliceBuffer:([I)Z
            ifne 6
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         6: .line 218
      StackMap locals: int int int
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.intUpto:I
            istore 6 /* newUpto */
        start local 6 // int newUpto
         7: .line 219
            iload 6 /* newUpto */
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.intOffset:I
            iadd
            istore 7 /* offset */
        start local 7 // int offset
         8: .line 220
            aload 0 /* this */
            dup
            getfield org.apache.lucene.util.IntBlockPool.intUpto:I
            iload 5 /* newSize */
            iadd
            putfield org.apache.lucene.util.IntBlockPool.intUpto:I
         9: .line 222
            aload 1 /* slice */
            iload 2 /* sliceOffset */
            iload 7 /* offset */
            iastore
        10: .line 225
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.buffer:[I
            aload 0 /* this */
            getfield org.apache.lucene.util.IntBlockPool.intUpto:I
            iconst_1
            isub
            iload 4 /* newLevel */
            iastore
        11: .line 227
            iload 6 /* newUpto */
            ireturn
        end local 7 // int offset
        end local 6 // int newUpto
        end local 5 // int newSize
        end local 4 // int newLevel
        end local 3 // int level
        end local 2 // int sliceOffset
        end local 1 // int[] slice
        end local 0 // org.apache.lucene.util.IntBlockPool this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0   12     0         this  Lorg/apache/lucene/util/IntBlockPool;
            0   12     1        slice  [I
            0   12     2  sliceOffset  I
            1   12     3        level  I
            2   12     4     newLevel  I
            3   12     5      newSize  I
            7   12     6      newUpto  I
            8   12     7       offset  I
    MethodParameters:
             Name  Flags
      slice        final
      sliceOffset  final
}
SourceFile: "IntBlockPool.java"
NestMembers:
  org.apache.lucene.util.IntBlockPool$Allocator  org.apache.lucene.util.IntBlockPool$DirectAllocator  org.apache.lucene.util.IntBlockPool$SliceReader  org.apache.lucene.util.IntBlockPool$SliceWriter
InnerClasses:
  public abstract Allocator = org.apache.lucene.util.IntBlockPool$Allocator of org.apache.lucene.util.IntBlockPool
  public final DirectAllocator = org.apache.lucene.util.IntBlockPool$DirectAllocator of org.apache.lucene.util.IntBlockPool
  public final SliceReader = org.apache.lucene.util.IntBlockPool$SliceReader of org.apache.lucene.util.IntBlockPool
  public SliceWriter = org.apache.lucene.util.IntBlockPool$SliceWriter of org.apache.lucene.util.IntBlockPool