OpenJDK 27 · jdk.internal.classfile.impl.ClassReaderImpl

Modifier and Type	Field and Description
private final Function<Utf8Entry, AttributeMapper<?>>	attributeMapper
private BootstrapMethodsAttribute	bootstrapMethodsAttribute
private List<BootstrapMethodEntryImpl>	bsmEntries
private final byte[]	buffer
private final int	classfileLength
private final int	constantPoolCount
private ClassModel	containedClass
pack-priv final ClassFileImpl	context
pack-priv final PoolEntry[]	cp
pack-priv static final int	CP_ITEM_START
private final int[]	cpOffset
private final int	flags
pack-priv final int	interfacesPos
private final int	metadataStart
private Optional<ClassEntry>	superclass
private ClassEntry	thisClass
private final int	thisClassPos

Access	Constructor and Description
pack-priv	ClassReaderImpl(byte[] classfileBytes, ClassFileImpl context)

Method Summary

Modifier and Type	Method and Description
public int	bootstrapMethodCount() Implements java.lang.classfile.constantpool.ConstantPool.bootstrapMethodCount. Returns the number of entries in the bootstrap method table.
public BootstrapMethodEntryImpl	bootstrapMethodEntry(int index) Implements java.lang.classfile.constantpool.ConstantPool.bootstrapMethodEntry. Returns the `BootstrapMethodEntry` at the specified index within the bootstrap method table.
pack-priv BootstrapMethodsAttribute	bootstrapMethodsAttribute()
pack-priv List<BootstrapMethodEntryImpl>	bsmEntries()
private static boolean	checkTag(int tag, Class<?> cls)
pack-priv static <T extends PoolEntry> T	checkType(PoolEntry e, int index, Class<T> cls)
private static ConstantPoolException	checkTypeError(int index, Class<?> cls)
public int	classfileLength() Implements java.lang.classfile.ClassReader.classfileLength. Returns the length of the `class` file, in number of bytes.
public boolean	compare(BufWriterImpl bufWriter, int bufWriterOffset, int classReaderOffset, int length)
public ClassFileImpl	context()
public void	copyBytesTo(BufWriter buf, int p, int len) Implements java.lang.classfile.ClassReader.copyBytesTo. Copy a range of bytes from the `class` file to a `BufWriter`.
public Function<Utf8Entry, AttributeMapper<?>>	customAttributes() Implements java.lang.classfile.ClassReader.customAttributes. Returns the table of custom attribute mappers.
public PoolEntry	entryByIndex(int index) Implements java.lang.classfile.constantpool.ConstantPool.entryByIndex. Returns the entry at the specified index.
public <T extends PoolEntry> T	entryByIndex(int index, Class<T> cls) Implements java.lang.classfile.constantpool.ConstantPool.entryByIndex. Returns the entry of a given type at the specified index.
public int	flags() Implements java.lang.classfile.ClassReader.flags. Returns the access flags for the class, as a bit mask.
pack-priv ClassModel	getContainedClass()
private static IllegalArgumentException	outOfBoundsError(IndexOutOfBoundsException cause)
public byte[]	readBytes(int p, int len) Implements java.lang.classfile.ClassReader.readBytes. Returns a copy of the bytes at the specified range in the `class` file.
public double	readDouble(int p) Implements java.lang.classfile.ClassReader.readDouble. Returns the double value at the specified offset within the `class` file.
public PoolEntry	readEntry(int pos) Implements java.lang.classfile.ClassReader.readEntry. Returns the constant pool entry whose index is given at the specified offset within the `class` file.
public <T extends PoolEntry> T	readEntry(int pos, Class<T> cls) Implements java.lang.classfile.ClassReader.readEntry. Returns the constant pool entry of a given type whose index is given at the specified offset within the `class` file.
public PoolEntry	readEntryOrNull(int pos) Implements java.lang.classfile.ClassReader.readEntryOrNull. Returns the constant pool entry whose index is given at the specified offset within the `class` file, or `null` if the index at the specified offset is zero.
public <T extends PoolEntry> T	readEntryOrNull(int offset, Class<T> cls) Implements java.lang.classfile.ClassReader.readEntryOrNull. Returns the constant pool entry of a given type whose index is given at the specified offset within the `class` file, or `null` if the index at the specified offset is zero.
public float	readFloat(int p) Implements java.lang.classfile.ClassReader.readFloat. Returns the float value at the specified offset within the `class` file.
public int	readInt(int p) Implements java.lang.classfile.ClassReader.readInt. Returns the signed int at the specified offset within the `class` file.
public long	readLong(int p) Implements java.lang.classfile.ClassReader.readLong. Returns the signed long at the specified offset within the `class` file.
public int	readS1(int p) Implements java.lang.classfile.ClassReader.readS1. Returns the signed byte at the specified offset within the `class` file.
public int	readS2(int p) Implements java.lang.classfile.ClassReader.readS2. Returns the signed byte at the specified offset within the `class` file.
public int	readU1(int p) Implements java.lang.classfile.ClassReader.readU1. Returns the unsigned byte at the specified offset within the `class` file.
public int	readU2(int p) Implements java.lang.classfile.ClassReader.readU2. Returns the `u2` at the specified offset within the `class` file.
pack-priv void	setContainedClass(ClassModel containedClass)
public int	size() Implements java.lang.classfile.constantpool.ConstantPool.size. Returns the exclusive upper bound of the valid indices of this constant pool.
public int	skipAttributeHolder(int offset)
public Optional<ClassEntry>	superclassEntry() Implements java.lang.classfile.ClassReader.superclassEntry. Returns the constant pool entry describing the name of the superclass, if any.
public ClassEntry	thisClassEntry() Implements java.lang.classfile.ClassReader.thisClassEntry. Returns the constant pool entry describing the name of class.
public int	thisClassPos()
pack-priv boolean	writeBootstrapMethods(BufWriterImpl buf)
pack-priv void	writeConstantPoolEntries(BufWriter buf)

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

attributeMapper	back to summary
private final Function<Utf8Entry, AttributeMapper<?>> attributeMapper

bootstrapMethodsAttribute	back to summary
private BootstrapMethodsAttribute bootstrapMethodsAttribute

bsmEntries	back to summary
private List<BootstrapMethodEntryImpl> bsmEntries

buffer	back to summary
private final byte[] buffer

classfileLength	back to summary
private final int classfileLength

constantPoolCount	back to summary
private final int constantPoolCount

containedClass	back to summary
private ClassModel containedClass

context	back to summary
pack-priv final ClassFileImpl context

cp	back to summary
pack-priv final PoolEntry[] cp

CP_ITEM_START	back to summary
pack-priv static final int CP_ITEM_START

cpOffset	back to summary
private final int[] cpOffset

flags	back to summary
private final int flags

interfacesPos	back to summary
pack-priv final int interfacesPos

superclass	back to summary
private Optional<ClassEntry> superclass

thisClass	back to summary
private ClassEntry thisClass

thisClassPos	back to summary
private final int thisClassPos

ClassReaderImpl	back to summary
pack-priv ClassReaderImpl(byte[] classfileBytes, ClassFileImpl context)

Method Detail

bootstrapMethodCount	back to summary
public int bootstrapMethodCount() Implements java.lang.classfile.constantpool.ConstantPool.bootstrapMethodCount. Doc from java.lang.classfile.constantpool.ConstantPool.bootstrapMethodCount. Returns the number of entries in the bootstrap method table. Annotations @Override

bootstrapMethodCount

back to summary

public int bootstrapMethodCount()

Implements java.lang.classfile.constantpool.ConstantPool.bootstrapMethodCount.

Doc from java.lang.classfile.constantpool.ConstantPool.bootstrapMethodCount.

Returns the number of entries in the bootstrap method table.

Annotations

@Override

bootstrapMethodEntry back to summary

bootstrapMethodEntry	back to summary
public BootstrapMethodEntryImpl bootstrapMethodEntry(int index) Implements java.lang.classfile.constantpool.ConstantPool.bootstrapMethodEntry. Doc from java.lang.classfile.constantpool.ConstantPool.bootstrapMethodEntry. Returns the `BootstrapMethodEntry` at the specified index within the bootstrap method table. Annotations @Override

public BootstrapMethodEntryImpl bootstrapMethodEntry(int index)

Implements java.lang.classfile.constantpool.ConstantPool.bootstrapMethodEntry.

Doc from java.lang.classfile.constantpool.ConstantPool.bootstrapMethodEntry.

Returns the BootstrapMethodEntry at the specified index within the bootstrap method table.

Annotations

@Override

bootstrapMethodsAttribute	back to summary
pack-priv BootstrapMethodsAttribute bootstrapMethodsAttribute()

bsmEntries	back to summary
pack-priv List<BootstrapMethodEntryImpl> bsmEntries()

checkTag	back to summary
private static boolean checkTag(int tag, Class<?> cls)

checkType	back to summary
pack-priv static <T extends PoolEntry> T checkType(PoolEntry e, int index, Class<T> cls)

checkTypeError	back to summary
private static ConstantPoolException checkTypeError(int index, Class<?> cls)

classfileLength back to summary

classfileLength	back to summary
public int classfileLength() Implements java.lang.classfile.ClassReader.classfileLength. Doc from java.lang.classfile.ClassReader.classfileLength. Returns the length of the `class` file, in number of bytes. Annotations @Override

public int classfileLength()

Implements java.lang.classfile.ClassReader.classfileLength.

Doc from java.lang.classfile.ClassReader.classfileLength.

Returns the length of the class file, in number of bytes.

Annotations

@Override

compare	back to summary
public boolean compare(BufWriterImpl bufWriter, int bufWriterOffset, int classReaderOffset, int length)

context	back to summary
public ClassFileImpl context()

copyBytesTo back to summary

copyBytesTo	back to summary
public void copyBytesTo(BufWriter buf, int p, int len) Implements java.lang.classfile.ClassReader.copyBytesTo. Doc from java.lang.classfile.ClassReader.copyBytesTo. Copy a range of bytes from the `class` file to a `BufWriter`. Annotations @Override

public void copyBytesTo(BufWriter buf, int p, int len)

Implements java.lang.classfile.ClassReader.copyBytesTo.

Doc from java.lang.classfile.ClassReader.copyBytesTo.

Copy a range of bytes from the class file to a BufWriter.

Annotations

@Override

customAttributes back to summary

customAttributes	back to summary
public Function<Utf8Entry, AttributeMapper<?>> customAttributes() Implements java.lang.classfile.ClassReader.customAttributes. Doc from java.lang.classfile.ClassReader.customAttributes. Returns the table of custom attribute mappers. This is derived from the processing option `ClassFile.AttributeMapperOption`. Annotations @Override

public Function<Utf8Entry, AttributeMapper<?>> customAttributes()

Implements java.lang.classfile.ClassReader.customAttributes.

Doc from java.lang.classfile.ClassReader.customAttributes.

Returns the table of custom attribute mappers. This is derived from the processing option ClassFile.AttributeMapperOption.

Annotations

@Override

entryByIndex	back to summary
public PoolEntry entryByIndex(int index) Implements java.lang.classfile.constantpool.ConstantPool.entryByIndex. Doc from java.lang.classfile.constantpool.ConstantPool.entryByIndex. Returns the entry at the specified index. Annotations @Override

entryByIndex

back to summary

public PoolEntry entryByIndex(int index)

Implements java.lang.classfile.constantpool.ConstantPool.entryByIndex.

Doc from java.lang.classfile.constantpool.ConstantPool.entryByIndex.

Returns the entry at the specified index.

Annotations

@Override

entryByIndex	back to summary
public <T extends PoolEntry> T entryByIndex(int index, Class<T> cls) Implements java.lang.classfile.constantpool.ConstantPool.entryByIndex. Doc from java.lang.classfile.constantpool.ConstantPool.entryByIndex. Returns the entry of a given type at the specified index. Annotations @Override

entryByIndex

back to summary

public <T extends PoolEntry> T entryByIndex(int index, Class<T> cls)

Implements java.lang.classfile.constantpool.ConstantPool.entryByIndex.

Doc from java.lang.classfile.constantpool.ConstantPool.entryByIndex.

Returns the entry of a given type at the specified index.

Annotations

@Override

flags	back to summary
public int flags() Implements java.lang.classfile.ClassReader.flags. Doc from java.lang.classfile.ClassReader.flags. Returns the access flags for the class, as a bit mask. Annotations @Override

flags

back to summary

public int flags()

Implements java.lang.classfile.ClassReader.flags.

Doc from java.lang.classfile.ClassReader.flags.

Returns the access flags for the class, as a bit mask.

Annotations

@Override

getContainedClass	back to summary
pack-priv ClassModel getContainedClass()

outOfBoundsError	back to summary
private static IllegalArgumentException outOfBoundsError(IndexOutOfBoundsException cause)

readBytes back to summary

readBytes	back to summary
public byte[] readBytes(int p, int len) Implements java.lang.classfile.ClassReader.readBytes. Doc from java.lang.classfile.ClassReader.readBytes. Returns a copy of the bytes at the specified range in the `class` file. Annotations @Override

public byte[] readBytes(int p, int len)

Implements java.lang.classfile.ClassReader.readBytes.

Doc from java.lang.classfile.ClassReader.readBytes.

Returns a copy of the bytes at the specified range in the class file.

Annotations

@Override

readDouble back to summary

readDouble	back to summary
public double readDouble(int p) Implements java.lang.classfile.ClassReader.readDouble. Doc from java.lang.classfile.ClassReader.readDouble. Returns the double value at the specified offset within the `class` file. Reads 8 bytes of value. In the conversions, all NaN values of the `double` may or may not be collapsed into a single "canonical" NaN value. Annotations @Override

public double readDouble(int p)

Implements java.lang.classfile.ClassReader.readDouble.

Doc from java.lang.classfile.ClassReader.readDouble.

Returns the double value at the specified offset within the class file. Reads 8 bytes of value.

In the conversions, all NaN values of the double may or may not be collapsed into a single "canonical" NaN value.

Annotations

@Override

readEntry back to summary

readEntry	back to summary
public PoolEntry readEntry(int pos) Implements java.lang.classfile.ClassReader.readEntry. Doc from java.lang.classfile.ClassReader.readEntry. Returns the constant pool entry whose index is given at the specified offset within the `class` file. Annotations @Override

public PoolEntry readEntry(int pos)

Implements java.lang.classfile.ClassReader.readEntry.

Doc from java.lang.classfile.ClassReader.readEntry.

Returns the constant pool entry whose index is given at the specified offset within the class file.

Annotations

@Override

readEntry back to summary

readEntry	back to summary
public <T extends PoolEntry> T readEntry(int pos, Class<T> cls) Implements java.lang.classfile.ClassReader.readEntry. Doc from java.lang.classfile.ClassReader.readEntry. Returns the constant pool entry of a given type whose index is given at the specified offset within the `class` file. Annotations @Override

public <T extends PoolEntry> T readEntry(int pos, Class<T> cls)

Implements java.lang.classfile.ClassReader.readEntry.

Doc from java.lang.classfile.ClassReader.readEntry.

Returns the constant pool entry of a given type whose index is given at the specified offset within the class file.

Annotations

@Override

readEntryOrNull back to summary

readEntryOrNull	back to summary
public PoolEntry readEntryOrNull(int pos) Implements java.lang.classfile.ClassReader.readEntryOrNull. Doc from java.lang.classfile.ClassReader.readEntryOrNull. Returns the constant pool entry whose index is given at the specified offset within the `class` file, or `null` if the index at the specified offset is zero. Annotations @Override

public PoolEntry readEntryOrNull(int pos)

Implements java.lang.classfile.ClassReader.readEntryOrNull.

Doc from java.lang.classfile.ClassReader.readEntryOrNull.

Returns the constant pool entry whose index is given at the specified offset within the class file, or null if the index at the specified offset is zero.

Annotations

@Override

readEntryOrNull back to summary

readEntryOrNull	back to summary
public <T extends PoolEntry> T readEntryOrNull(int offset, Class<T> cls) Implements java.lang.classfile.ClassReader.readEntryOrNull. Doc from java.lang.classfile.ClassReader.readEntryOrNull. Returns the constant pool entry of a given type whose index is given at the specified offset within the `class` file, or `null` if the index at the specified offset is zero. Annotations @Override

public <T extends PoolEntry> T readEntryOrNull(int offset, Class<T> cls)

Implements java.lang.classfile.ClassReader.readEntryOrNull.

Doc from java.lang.classfile.ClassReader.readEntryOrNull.

Returns the constant pool entry of a given type whose index is given at the specified offset within the class file, or null if the index at the specified offset is zero.

Annotations

@Override

readFloat back to summary

readFloat	back to summary
public float readFloat(int p) Implements java.lang.classfile.ClassReader.readFloat. Doc from java.lang.classfile.ClassReader.readFloat. Returns the float value at the specified offset within the `class` file. Reads 4 bytes of value. In the conversions, all NaN values of the `float` may or may not be collapsed into a single "canonical" NaN value. Annotations @Override

public float readFloat(int p)

Implements java.lang.classfile.ClassReader.readFloat.

Doc from java.lang.classfile.ClassReader.readFloat.

Returns the float value at the specified offset within the class file. Reads 4 bytes of value.

In the conversions, all NaN values of the float may or may not be collapsed into a single "canonical" NaN value.

Annotations

@Override

readInt back to summary

readInt	back to summary
public int readInt(int p) Implements java.lang.classfile.ClassReader.readInt. Doc from java.lang.classfile.ClassReader.readInt. Returns the signed int at the specified offset within the `class` file. Reads 4 bytes of value. Annotations @Override

public int readInt(int p)

Implements java.lang.classfile.ClassReader.readInt.

Doc from java.lang.classfile.ClassReader.readInt.

Returns the signed int at the specified offset within the class file. Reads 4 bytes of value.

Annotations

@Override

readLong back to summary

readLong	back to summary
public long readLong(int p) Implements java.lang.classfile.ClassReader.readLong. Doc from java.lang.classfile.ClassReader.readLong. Returns the signed long at the specified offset within the `class` file. Reads 8 bytes of value. Annotations @Override

public long readLong(int p)

Implements java.lang.classfile.ClassReader.readLong.

Doc from java.lang.classfile.ClassReader.readLong.

Returns the signed long at the specified offset within the class file. Reads 8 bytes of value.

Annotations

@Override

readS1 back to summary

readS1	back to summary
public int readS1(int p) Implements java.lang.classfile.ClassReader.readS1. Doc from java.lang.classfile.ClassReader.readS1. Returns the signed byte at the specified offset within the `class` file. Reads a byte and sign-extends it to an `int`. Annotations @Override

public int readS1(int p)

Implements java.lang.classfile.ClassReader.readS1.

Doc from java.lang.classfile.ClassReader.readS1.

Returns the signed byte at the specified offset within the class file. Reads a byte and sign-extends it to an int.

Annotations

@Override

readS2 back to summary

readS2	back to summary
public int readS2(int p) Implements java.lang.classfile.ClassReader.readS2. Doc from java.lang.classfile.ClassReader.readS2. Returns the signed byte at the specified offset within the `class` file. Reads a 2-byte value and sign-extends it to an `int`. Annotations @Override

public int readS2(int p)

Implements java.lang.classfile.ClassReader.readS2.

Doc from java.lang.classfile.ClassReader.readS2.

Returns the signed byte at the specified offset within the class file. Reads a 2-byte value and sign-extends it to an int.

Annotations

@Override

readU1 back to summary

readU1	back to summary
public int readU1(int p) Implements java.lang.classfile.ClassReader.readU1. Doc from java.lang.classfile.ClassReader.readU1. Returns the unsigned byte at the specified offset within the `class` file. Reads a byte and zero-extends it to an `int`. Annotations @Override

public int readU1(int p)

Implements java.lang.classfile.ClassReader.readU1.

Doc from java.lang.classfile.ClassReader.readU1.

Returns the unsigned byte at the specified offset within the class file. Reads a byte and zero-extends it to an int.

Annotations

@Override

readU2 back to summary

public int readU2(int p)

Implements java.lang.classfile.ClassReader.readU2.

Doc from java.lang.classfile.ClassReader.readU2.

Returns the u2 at the specified offset within the class file. Reads a 2-byte value and zero-extends it to an int.

Annotations

@Override

setContainedClass	back to summary
pack-priv void setContainedClass(ClassModel containedClass)

size back to summary

public int size()

Implements java.lang.classfile.constantpool.ConstantPool.size.

Doc from java.lang.classfile.constantpool.ConstantPool.size.

Returns the exclusive upper bound of the valid indices of this constant pool. The actual number of entries is lower because 0, size() are not valid, and a valid index may be unusable.

Annotations