Top Description Fields Constructors Methods
jdk.vm.ci.hotspot

pack-priv final Class HotSpotSpeculationEncoding

extends ByteArrayOutputStream
implements SpeculationReasonEncoding
Class Inheritance
All Implemented Interfaces
jdk.vm.ci.meta.SpeculationLog.SpeculationReasonEncoding
Imports
java.io.ByteArrayOutputStream, .DataOutputStream, .IOException, java.security.MessageDigest, .NoSuchAlgorithmException, java.util.Arrays, jdk.vm.ci.common.JVMCIError, jdk.vm.ci.meta.ResolvedJavaMethod, .ResolvedJavaType, .SpeculationLog.SpeculationReasonEncoding
Implements a SpeculationReasonEncoding that produces a byte array. Data is added via a DataOutputStream. When producing the final byte array, if the total length of data exceeds 31, then a SHA-1 digest of the data is produced instead.

Field Summary

Modifier and TypeField and Description
private DataOutputStream
dos

pack-priv static final int
LENGTH_BITS

Number of bits used for the length of an encoded speculation.

pack-priv static final int
LENGTH_MASK

pack-priv static final int
MAX_LENGTH

The maximum length of an encoded speculation.

private static final int
NULL_METHOD

private static final int
NULL_STRING

private static final int
NULL_TYPE

private byte[]
result

private static final MessageDigest
SHA1

Prototype SHA1 digest.

private static final boolean
SHA1_IS_CLONEABLE

Cloning the prototype is quicker than calling MessageDigest#getInstance(String) every time.

private static final int
SHA1_LENGTH

Inherited from java.io.ByteArrayOutputStream:
bufcount

Constructor Summary

AccessConstructor and Description
pack-priv
HotSpotSpeculationEncoding()

Method Summary

Modifier and TypeMethod and Description
public void
addByte(int value)

Implements jdk.vm.ci.meta.SpeculationLog.SpeculationReasonEncoding.addByte.

public void
addInt(int value)

Implements jdk.vm.ci.meta.SpeculationLog.SpeculationReasonEncoding.addInt.

public void
addLong(long value)

Implements jdk.vm.ci.meta.SpeculationLog.SpeculationReasonEncoding.addLong.

public void
addMethod(ResolvedJavaMethod method)

Implements jdk.vm.ci.meta.SpeculationLog.SpeculationReasonEncoding.addMethod.

private boolean
addNull(Object o, int nullValue)

public void
addShort(int value)

Implements jdk.vm.ci.meta.SpeculationLog.SpeculationReasonEncoding.addShort.

public void
addString(String value)

Implements jdk.vm.ci.meta.SpeculationLog.SpeculationReasonEncoding.addString.

public void
addType(ResolvedJavaType type)

Implements jdk.vm.ci.meta.SpeculationLog.SpeculationReasonEncoding.addType.

private void
checkOpen()

pack-priv byte[]
getByteArray()

Gets the final encoded byte array and closes this encoding such that any further attempts to update it result in an IllegalArgumentException.

Inherited from java.io.ByteArrayOutputStream:
closeresetsizetoByteArraytoStringtoStringtoStringtoStringwritewritewriteByteswriteTo

Field Detail

dosback to summary
private DataOutputStream dos
LENGTH_BITSback to summary
pack-priv static final int LENGTH_BITS

Number of bits used for the length of an encoded speculation. The bit size of 5 is chosen to accommodate specifying // the length of a SHA-1 digest (i.e., 20 bytes).

LENGTH_MASKback to summary
pack-priv static final int LENGTH_MASK
MAX_LENGTHback to summary
pack-priv static final int MAX_LENGTH

The maximum length of an encoded speculation.

NULL_METHODback to summary
private static final int NULL_METHOD
NULL_STRINGback to summary
private static final int NULL_STRING
NULL_TYPEback to summary
private static final int NULL_TYPE
resultback to summary
private byte[] result
SHA1back to summary
private static final MessageDigest SHA1

Prototype SHA1 digest.

SHA1_IS_CLONEABLEback to summary
private static final boolean SHA1_IS_CLONEABLE

Cloning the prototype is quicker than calling MessageDigest#getInstance(String) every time.

SHA1_LENGTHback to summary
private static final int SHA1_LENGTH

Constructor Detail

HotSpotSpeculationEncodingback to summary
pack-priv HotSpotSpeculationEncoding()

Method Detail

addByteback to summary
public void addByte(int value)

Implements jdk.vm.ci.meta.SpeculationLog.SpeculationReasonEncoding.addByte.

Annotations
@Override
addIntback to summary
public void addInt(int value)

Implements jdk.vm.ci.meta.SpeculationLog.SpeculationReasonEncoding.addInt.

Annotations
@Override
addLongback to summary
public void addLong(long value)

Implements jdk.vm.ci.meta.SpeculationLog.SpeculationReasonEncoding.addLong.

Annotations
@Override
addMethodback to summary
public void addMethod(ResolvedJavaMethod method)

Implements jdk.vm.ci.meta.SpeculationLog.SpeculationReasonEncoding.addMethod.

Annotations
@Override
addNullback to summary
private boolean addNull(Object o, int nullValue)
addShortback to summary
public void addShort(int value)

Implements jdk.vm.ci.meta.SpeculationLog.SpeculationReasonEncoding.addShort.

Annotations
@Override
addStringback to summary
public void addString(String value)

Implements jdk.vm.ci.meta.SpeculationLog.SpeculationReasonEncoding.addString.

Annotations
@Override
addTypeback to summary
public void addType(ResolvedJavaType type)

Implements jdk.vm.ci.meta.SpeculationLog.SpeculationReasonEncoding.addType.

Annotations
@Override
checkOpenback to summary
private void checkOpen()
getByteArrayback to summary
pack-priv byte[] getByteArray()

Gets the final encoded byte array and closes this encoding such that any further attempts to update it result in an IllegalArgumentException.