public class org.h2.util.MathUtils
minor version: 0
major version: 59
flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
this_class: org.h2.util.MathUtils
super_class: java.lang.Object
{
static java.security.SecureRandom cachedSecureRandom;
descriptor: Ljava/security/SecureRandom;
flags: (0x0008) ACC_STATIC
static volatile boolean seeded;
descriptor: Z
flags: (0x0048) ACC_STATIC, ACC_VOLATILE
private void <init>();
descriptor: ()V
flags: (0x0002) ACC_PRIVATE
Code:
stack=1, locals=1, args_size=1
start local 0 0: aload 0
invokespecial java.lang.Object.<init>:()V
1: return
end local 0 LocalVariableTable:
Start End Slot Name Signature
0 2 0 this Lorg/h2/util/MathUtils;
public static int roundUpInt(int, int);
descriptor: (II)I
flags: (0x0009) ACC_PUBLIC, ACC_STATIC
Code:
stack=2, locals=2, args_size=2
start local 0 start local 1 0: iload 0
iload 1
iadd
iconst_1
isub
iload 1
ineg
iand
ireturn
end local 1 end local 0 LocalVariableTable:
Start End Slot Name Signature
0 1 0 x I
0 1 1 blockSizePowerOf2 I
MethodParameters:
Name Flags
x
blockSizePowerOf2
public static long roundUpLong(long, long);
descriptor: (JJ)J
flags: (0x0009) ACC_PUBLIC, ACC_STATIC
Code:
stack=4, locals=4, args_size=2
start local 0 start local 2 0: lload 0
lload 2
ladd
lconst_1
lsub
lload 2
lneg
land
lreturn
end local 2 end local 0 LocalVariableTable:
Start End Slot Name Signature
0 1 0 x J
0 1 2 blockSizePowerOf2 J
MethodParameters:
Name Flags
x
blockSizePowerOf2
private static synchronized java.security.SecureRandom getSecureRandom();
descriptor: ()Ljava/security/SecureRandom;
flags: (0x002a) ACC_PRIVATE, ACC_STATIC, ACC_SYNCHRONIZED
Code:
stack=4, locals=4, args_size=0
0: getstatic org.h2.util.MathUtils.cachedSecureRandom:Ljava/security/SecureRandom;
ifnull 2
1: getstatic org.h2.util.MathUtils.cachedSecureRandom:Ljava/security/SecureRandom;
areturn
2: StackMap locals:
StackMap stack:
ldc "SHA1PRNG"
invokestatic java.security.SecureRandom.getInstance:(Ljava/lang/String;)Ljava/security/SecureRandom;
putstatic org.h2.util.MathUtils.cachedSecureRandom:Ljava/security/SecureRandom;
3: new org.h2.util.MathUtils$1
dup
invokespecial org.h2.util.MathUtils$1.<init>:()V
astore 0
start local 0 4: new java.lang.Thread
dup
aload 0
ldc "Generate Seed"
invokespecial java.lang.Thread.<init>:(Ljava/lang/Runnable;Ljava/lang/String;)V
astore 1
start local 1 5: aload 1
iconst_1
invokevirtual java.lang.Thread.setDaemon:(Z)V
6: aload 1
invokevirtual java.lang.Thread.start:()V
7: invokestatic java.lang.Thread.yield:()V
8: aload 1
ldc 400
invokevirtual java.lang.Thread.join:(J)V
9: goto 12
StackMap locals: java.lang.Runnable java.lang.Thread
StackMap stack: java.lang.InterruptedException
10: astore 2
start local 2 11: ldc "InterruptedException"
aload 2
invokestatic org.h2.util.MathUtils.warn:(Ljava/lang/String;Ljava/lang/Throwable;)V
end local 2 12: StackMap locals:
StackMap stack:
getstatic org.h2.util.MathUtils.seeded:Z
ifne 27
13: invokestatic org.h2.util.MathUtils.generateAlternativeSeed:()[B
astore 2
start local 2 14: getstatic org.h2.util.MathUtils.cachedSecureRandom:Ljava/security/SecureRandom;
dup
astore 3
monitorenter
15: getstatic org.h2.util.MathUtils.cachedSecureRandom:Ljava/security/SecureRandom;
aload 2
invokevirtual java.security.SecureRandom.setSeed:([B)V
16: aload 3
monitorexit
17: goto 27
StackMap locals: java.lang.Runnable java.lang.Thread byte[] java.security.SecureRandom
StackMap stack: java.lang.Throwable
18: aload 3
monitorexit
19: athrow
end local 2 end local 1 20: StackMap locals: java.lang.Runnable
StackMap stack: java.lang.SecurityException
pop
21: aload 0
invokeinterface java.lang.Runnable.run:()V
22: invokestatic org.h2.util.MathUtils.generateAlternativeSeed:()[B
pop
end local 0 23: goto 27
StackMap locals:
StackMap stack: java.lang.Exception
24: astore 0
start local 0 25: ldc "SecureRandom"
aload 0
invokestatic org.h2.util.MathUtils.warn:(Ljava/lang/String;Ljava/lang/Throwable;)V
26: new java.security.SecureRandom
dup
invokespecial java.security.SecureRandom.<init>:()V
putstatic org.h2.util.MathUtils.cachedSecureRandom:Ljava/security/SecureRandom;
end local 0 27: StackMap locals:
StackMap stack:
getstatic org.h2.util.MathUtils.cachedSecureRandom:Ljava/security/SecureRandom;
areturn
LocalVariableTable:
Start End Slot Name Signature
4 23 0 runnable Ljava/lang/Runnable;
5 20 1 t Ljava/lang/Thread;
11 12 2 e Ljava/lang/InterruptedException;
14 20 2 seed [B
25 27 0 e Ljava/lang/Exception;
Exception table:
from to target type
8 9 10 Class java.lang.InterruptedException
15 17 18 any
18 19 18 any
4 20 20 Class java.lang.SecurityException
2 23 24 Class java.lang.Exception
public static byte[] generateAlternativeSeed();
descriptor: ()[B
flags: (0x0009) ACC_PUBLIC, ACC_STATIC
Code:
stack=6, locals=12, args_size=0
0: new java.io.ByteArrayOutputStream
dup
invokespecial java.io.ByteArrayOutputStream.<init>:()V
astore 0
start local 0 1: new java.io.DataOutputStream
dup
aload 0
invokespecial java.io.DataOutputStream.<init>:(Ljava/io/OutputStream;)V
astore 1
start local 1 2: aload 1
invokestatic java.lang.System.currentTimeMillis:()J
invokevirtual java.io.DataOutputStream.writeLong:(J)V
3: aload 1
invokestatic java.lang.System.nanoTime:()J
invokevirtual java.io.DataOutputStream.writeLong:(J)V
4: aload 1
new java.lang.Object
dup
invokespecial java.lang.Object.<init>:()V
invokevirtual java.lang.Object.hashCode:()I
invokevirtual java.io.DataOutputStream.writeInt:(I)V
5: invokestatic java.lang.Runtime.getRuntime:()Ljava/lang/Runtime;
astore 2
start local 2 6: aload 1
aload 2
invokevirtual java.lang.Runtime.freeMemory:()J
invokevirtual java.io.DataOutputStream.writeLong:(J)V
7: aload 1
aload 2
invokevirtual java.lang.Runtime.maxMemory:()J
invokevirtual java.io.DataOutputStream.writeLong:(J)V
8: aload 1
aload 2
invokevirtual java.lang.Runtime.totalMemory:()J
invokevirtual java.io.DataOutputStream.writeLong:(J)V
9: invokestatic java.lang.System.getProperties:()Ljava/util/Properties;
invokevirtual java.util.Properties.toString:()Ljava/lang/String;
astore 3
start local 3 10: aload 1
aload 3
invokevirtual java.lang.String.length:()I
invokevirtual java.io.DataOutputStream.writeInt:(I)V
11: aload 1
aload 3
getstatic java.nio.charset.StandardCharsets.UTF_8:Ljava/nio/charset/Charset;
invokevirtual java.lang.String.getBytes:(Ljava/nio/charset/Charset;)[B
invokevirtual java.io.DataOutputStream.write:([B)V
end local 3 12: goto 15
StackMap locals: java.io.ByteArrayOutputStream java.io.DataOutputStream java.lang.Runtime
StackMap stack: java.lang.Exception
13: astore 3
start local 3 14: ldc "generateAlternativeSeed"
aload 3
invokestatic org.h2.util.MathUtils.warn:(Ljava/lang/String;Ljava/lang/Throwable;)V
end local 3 15: StackMap locals:
StackMap stack:
ldc "java.net.InetAddress"
16: invokestatic java.lang.Class.forName:(Ljava/lang/String;)Ljava/lang/Class;
astore 3
start local 3 17: aload 3
18: ldc "getLocalHost"
iconst_0
anewarray java.lang.Class
19: invokevirtual java.lang.Class.getMethod:(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;
20: aconst_null
iconst_0
anewarray java.lang.Object
invokevirtual java.lang.reflect.Method.invoke:(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;
21: astore 4
start local 4 22: aload 3
23: ldc "getHostName"
iconst_0
anewarray java.lang.Class
24: invokevirtual java.lang.Class.getMethod:(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;
25: aload 4
iconst_0
anewarray java.lang.Object
invokevirtual java.lang.reflect.Method.invoke:(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;
invokevirtual java.lang.Object.toString:()Ljava/lang/String;
26: astore 5
start local 5 27: aload 1
aload 5
invokevirtual java.io.DataOutputStream.writeUTF:(Ljava/lang/String;)V
28: aload 3
29: ldc "getAllByName"
iconst_1
anewarray java.lang.Class
dup
iconst_0
ldc Ljava/lang/String;
aastore
30: invokevirtual java.lang.Class.getMethod:(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;
31: aconst_null
iconst_1
anewarray java.lang.Object
dup
iconst_0
aload 5
aastore
invokevirtual java.lang.reflect.Method.invoke:(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;
32: checkcast java.lang.Object[]
astore 6
start local 6 33: aload 3
34: ldc "getAddress"
iconst_0
anewarray java.lang.Class
35: invokevirtual java.lang.Class.getMethod:(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;
astore 7
start local 7 36: aload 6
dup
astore 11
arraylength
istore 10
iconst_0
istore 9
goto 40
StackMap locals: java.io.ByteArrayOutputStream java.io.DataOutputStream java.lang.Runtime java.lang.Class java.lang.Object java.lang.String java.lang.Object[] java.lang.reflect.Method top int int java.lang.Object[]
StackMap stack:
37: aload 11
iload 9
aaload
astore 8
start local 8 38: aload 1
aload 7
aload 8
iconst_0
anewarray java.lang.Object
invokevirtual java.lang.reflect.Method.invoke:(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;
checkcast byte[]
invokevirtual java.io.DataOutputStream.write:([B)V
end local 8 39: iinc 9 1
StackMap locals:
StackMap stack:
40: iload 9
iload 10
if_icmplt 37
end local 7 end local 6 end local 5 end local 4 end local 3 41: goto 43
StackMap locals: java.io.ByteArrayOutputStream java.io.DataOutputStream java.lang.Runtime
StackMap stack: java.lang.Throwable
42: pop
43: StackMap locals:
StackMap stack:
iconst_0
istore 3
start local 3 44: goto 52
45: StackMap locals: int
StackMap stack:
iconst_0
istore 4
start local 4 46: invokestatic java.lang.System.currentTimeMillis:()J
lstore 5
start local 5 47: goto 49
48: StackMap locals: int long
StackMap stack:
iinc 4 1
49: StackMap locals:
StackMap stack:
lload 5
invokestatic java.lang.System.currentTimeMillis:()J
lcmp
ifeq 48
50: aload 1
iload 4
invokevirtual java.io.DataOutputStream.writeInt:(I)V
end local 5 end local 4 51: iinc 3 1
StackMap locals:
StackMap stack:
52: iload 3
bipush 16
if_icmplt 45
end local 3 53: aload 1
invokevirtual java.io.DataOutputStream.close:()V
54: aload 0
invokevirtual java.io.ByteArrayOutputStream.toByteArray:()[B
55: areturn
end local 2 end local 1 end local 0 56: StackMap locals:
StackMap stack: java.io.IOException
astore 0
start local 0 57: ldc "generateAlternativeSeed"
aload 0
invokestatic org.h2.util.MathUtils.warn:(Ljava/lang/String;Ljava/lang/Throwable;)V
58: iconst_1
newarray 8
areturn
end local 0 LocalVariableTable:
Start End Slot Name Signature
1 56 0 bout Ljava/io/ByteArrayOutputStream;
2 56 1 out Ljava/io/DataOutputStream;
6 56 2 runtime Ljava/lang/Runtime;
10 12 3 s Ljava/lang/String;
14 15 3 e Ljava/lang/Exception;
17 41 3 inetAddressClass Ljava/lang/Class<*>;
22 41 4 localHost Ljava/lang/Object;
27 41 5 hostName Ljava/lang/String;
33 41 6 list [Ljava/lang/Object;
36 41 7 getAddress Ljava/lang/reflect/Method;
38 39 8 o Ljava/lang/Object;
44 53 3 j I
46 51 4 i I
47 51 5 end J
57 59 0 e Ljava/io/IOException;
Exception table:
from to target type
9 12 13 Class java.lang.Exception
15 41 42 Class java.lang.Throwable
0 55 56 Class java.io.IOException
static void warn(java.lang.String, java.lang.Throwable);
descriptor: (Ljava/lang/String;Ljava/lang/Throwable;)V
flags: (0x0008) ACC_STATIC
Code:
stack=4, locals=2, args_size=2
start local 0 start local 1 0: getstatic java.lang.System.out:Ljava/io/PrintStream;
new java.lang.StringBuilder
dup
ldc "Warning: "
invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
aload 0
invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
invokevirtual java.io.PrintStream.println:(Ljava/lang/String;)V
1: aload 1
ifnull 3
2: aload 1
invokevirtual java.lang.Throwable.printStackTrace:()V
3: StackMap locals:
StackMap stack:
return
end local 1 end local 0 LocalVariableTable:
Start End Slot Name Signature
0 4 0 s Ljava/lang/String;
0 4 1 t Ljava/lang/Throwable;
MethodParameters:
Name Flags
s
t
public static int nextPowerOf2(int);
descriptor: (I)I
flags: (0x0009) ACC_PUBLIC, ACC_STATIC
Code:
stack=5, locals=1, args_size=1
start local 0 0: iload 0
ifne 2
1: iconst_1
ireturn
2: StackMap locals:
StackMap stack:
iload 0
iflt 3
iload 0
ldc 1073741824
if_icmple 6
3: StackMap locals:
StackMap stack:
new java.lang.IllegalArgumentException
dup
new java.lang.StringBuilder
dup
ldc "Argument out of range [0x0-0x40000000]. Argument was: "
invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
4: iload 0
invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
5: invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
athrow
6: StackMap locals:
StackMap stack:
iinc 0 -1
7: iload 0
iload 0
iconst_1
ishr
ior
istore 0
8: iload 0
iload 0
iconst_2
ishr
ior
istore 0
9: iload 0
iload 0
iconst_4
ishr
ior
istore 0
10: iload 0
iload 0
bipush 8
ishr
ior
istore 0
11: iload 0
iload 0
bipush 16
ishr
ior
istore 0
12: iinc 0 1
iload 0
ireturn
end local 0 LocalVariableTable:
Start End Slot Name Signature
0 13 0 x I
Exceptions:
throws java.lang.IllegalArgumentException
MethodParameters:
Name Flags
x
public static int convertLongToInt(long);
descriptor: (J)I
flags: (0x0009) ACC_PUBLIC, ACC_STATIC
Code:
stack=4, locals=2, args_size=1
start local 0 0: lload 0
ldc -2147483648
lcmp
ifgt 2
1: ldc -2147483648
ireturn
2: StackMap locals:
StackMap stack:
lload 0
ldc 2147483647
lcmp
iflt 4
3: ldc 2147483647
ireturn
4: StackMap locals:
StackMap stack:
lload 0
l2i
ireturn
end local 0 LocalVariableTable:
Start End Slot Name Signature
0 5 0 l J
MethodParameters:
Name Flags
l
public static long secureRandomLong();
descriptor: ()J
flags: (0x0009) ACC_PUBLIC, ACC_STATIC
Code:
stack=2, locals=0, args_size=0
0: invokestatic org.h2.util.MathUtils.getSecureRandom:()Ljava/security/SecureRandom;
invokevirtual java.security.SecureRandom.nextLong:()J
lreturn
LocalVariableTable:
Start End Slot Name Signature
public static void randomBytes(byte[]);
descriptor: ([B)V
flags: (0x0009) ACC_PUBLIC, ACC_STATIC
Code:
stack=2, locals=1, args_size=1
start local 0 0: invokestatic java.util.concurrent.ThreadLocalRandom.current:()Ljava/util/concurrent/ThreadLocalRandom;
aload 0
invokevirtual java.util.concurrent.ThreadLocalRandom.nextBytes:([B)V
1: return
end local 0 LocalVariableTable:
Start End Slot Name Signature
0 2 0 bytes [B
MethodParameters:
Name Flags
bytes
public static byte[] secureRandomBytes(int);
descriptor: (I)[B
flags: (0x0009) ACC_PUBLIC, ACC_STATIC
Code:
stack=2, locals=2, args_size=1
start local 0 0: iload 0
ifgt 2
1: iconst_1
istore 0
2: StackMap locals:
StackMap stack:
iload 0
newarray 8
astore 1
start local 1 3: invokestatic org.h2.util.MathUtils.getSecureRandom:()Ljava/security/SecureRandom;
aload 1
invokevirtual java.security.SecureRandom.nextBytes:([B)V
4: aload 1
areturn
end local 1 end local 0 LocalVariableTable:
Start End Slot Name Signature
0 5 0 len I
3 5 1 buff [B
MethodParameters:
Name Flags
len
public static int randomInt(int);
descriptor: (I)I
flags: (0x0009) ACC_PUBLIC, ACC_STATIC
Code:
stack=2, locals=1, args_size=1
start local 0 0: invokestatic java.util.concurrent.ThreadLocalRandom.current:()Ljava/util/concurrent/ThreadLocalRandom;
iload 0
invokevirtual java.util.concurrent.ThreadLocalRandom.nextInt:(I)I
ireturn
end local 0 LocalVariableTable:
Start End Slot Name Signature
0 1 0 lowerThan I
MethodParameters:
Name Flags
lowerThan
public static int secureRandomInt(int);
descriptor: (I)I
flags: (0x0009) ACC_PUBLIC, ACC_STATIC
Code:
stack=2, locals=1, args_size=1
start local 0 0: invokestatic org.h2.util.MathUtils.getSecureRandom:()Ljava/security/SecureRandom;
iload 0
invokevirtual java.security.SecureRandom.nextInt:(I)I
ireturn
end local 0 LocalVariableTable:
Start End Slot Name Signature
0 1 0 lowerThan I
MethodParameters:
Name Flags
lowerThan
}
SourceFile: "MathUtils.java"
NestMembers:
org.h2.util.MathUtils$1
InnerClasses:
org.h2.util.MathUtils$1