Package serp.bytecode.lowlevel

Class Entry

java.lang.Object
serp.bytecode.lowlevel.Entry
All Implemented Interfaces:
VisitAcceptor
Direct Known Subclasses:
ClassEntry, ComplexEntry, DoubleEntry, FloatEntry, IntEntry, InvokeDynamicEntry, LongEntry, MethodHandleEntry, MethodTypeEntry, NameAndTypeEntry, StringEntry, UTF8Entry
public abstract class Entry extends Object implements VisitAcceptor
Base type for all constant pool entries. Entries should generally be considered immutable; modifying an entry directly can have dire consequences, and often renders the resulting class file invalid.

Entries cannot be shared among constant pools.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private int
    _index
     
    private ConstantPool
    _pool
     
    static final int
    CLASS
     
    static final int
    DOUBLE
     
    static final int
    FIELD
     
    static final int
    FLOAT
     
    static final int
    INT
     
    static final int
    INTERFACEMETHOD
     
    static final int
    INVOKEDYNAMIC
     
    static final int
    LONG
     
    static final int
    METHOD
     
    static final int
    METHODHANDLE
     
    static final int
    METHODTYPE
     
    static final int
    NAMEANDTYPE
     
    static final int
    STRING
     
    static final int
    UTF8
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    Entry()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    (package private) void
    afterModify(Object key)
    Subclasses must call this method when their state is mutated.
    (package private) Object
    beforeModify()
    Subclasses must call this method before their state is mutated.
    static Entry
    create(int type)
    Create an entry based on its type code.
    int
    getIndex()
    Returns the index of the entry in the owning constant pool, or 0.
    ConstantPool
    getPool()
    Returns the constant pool containing this entry, or null if none.
    abstract int
    getType()
    Return the type code for this entry type.
    boolean
    isWide()
    Return true if this is a wide entry -- i.e.
    static Entry
    read(DataInput in)
    Read a single entry from the given bytecode stream and returns it.
    (package private) abstract void
    readData(DataInput in)
    This method is called after reading the entry type from bytecode.
    (package private) void
    setIndex(int index)
    Set the index of this entry within the pool.
    (package private) void
    setPool(ConstantPool pool)
    Sets the owning pool of the entry.
    static void
    write(Entry entry, DataOutput out)
    Write the given entry to the given bytecode stream.
    (package private) abstract void
    writeData(DataOutput out)
    This method is called after writing the entry type to bytecode.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    Methods inherited from interface serp.bytecode.visitor.VisitAcceptor

    acceptVisit

  • Field Details

  • Constructor Details

    • Entry

      public Entry()

  • Method Details

    • read

      public static Entry read(DataInput in) throws IOException
      Read a single entry from the given bytecode stream and returns it.
      Throws:
      IOException

    • write

      public static void write(Entry entry, DataOutput out) throws IOException
      Write the given entry to the given bytecode stream.
      Throws:
      IOException

    • create

      public static Entry create(int type)
      Create an entry based on its type code.

    • getType

      public abstract int getType()
      Return the type code for this entry type.

    • isWide

      public boolean isWide()
      Return true if this is a wide entry -- i.e. if it takes up two places in the constant pool. Returns false by default.

    • getPool

      public ConstantPool getPool()
      Returns the constant pool containing this entry, or null if none.

    • getIndex

      public int getIndex()
      Returns the index of the entry in the owning constant pool, or 0.

    • readData

      abstract void readData(DataInput in) throws IOException
      This method is called after reading the entry type from bytecode. It should read all the data for this entry from the given stream.
      Throws:
      IOException

    • writeData

      abstract void writeData(DataOutput out) throws IOException
      This method is called after writing the entry type to bytecode. It should write all data for this entry to the given stream.
      Throws:
      IOException

    • beforeModify

      Object beforeModify()
      Subclasses must call this method before their state is mutated.

    • afterModify

      void afterModify(Object key)
      Subclasses must call this method when their state is mutated.

    • setPool

      void setPool(ConstantPool pool)
      Sets the owning pool of the entry.

    • setIndex

      void setIndex(int index)
      Set the index of this entry within the pool.