Package javassist.bytecode

Class StackMapTable.Walker

java.lang.Object
javassist.bytecode.StackMapTable.Walker
Enclosing class:
StackMapTable
public static class StackMapTable.Walker extends Object
A code walker for a StackMapTable attribute.

  • Constructor Summary

    Constructors
    Constructor
    Description
    Walker(byte[] data)
    Constructs a walker.
    Walker(StackMapTable smt)
    Constructs a walker.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    appendFrame(int pos, int offsetDelta, int[] tags, int[] data)
    Invoked if the visited frame is a append_frame.
    void
    chopFrame(int pos, int offsetDelta, int k)
    Invoked if the visited frame is a chop_frame.
    void
    fullFrame(int pos, int offsetDelta, int[] localTags, int[] localData, int[] stackTags, int[] stackData)
    Invoked if the visited frame is full_frame.
    void
    objectOrUninitialized(int tag, int data, int pos)
    Invoked if Object_variable_info or Uninitialized_variable_info is visited.
    void
    parse()
    Visits each entry of the stack map frames.
    void
    sameFrame(int pos, int offsetDelta)
    Invoked if the visited frame is a same_frame or a same_frame_extended.
    void
    sameLocals(int pos, int offsetDelta, int stackTag, int stackData)
    Invoked if the visited frame is a same_locals_1_stack_item_frame or a same_locals_1_stack_item_frame_extended.
    final int
    size()
    Returns the number of the entries.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • Walker

      public Walker(StackMapTable smt)
      Constructs a walker.
      Parameters:
      smt - the StackMapTable that this walker walks around.

    • Walker

      public Walker(byte[] data)
      Constructs a walker.
      Parameters:
      data - the info field of the attribute_info structure. It can be obtained by get() in the AttributeInfo class.

  • Method Details

    • size

      public final int size()
      Returns the number of the entries.

    • parse

      public void parse() throws BadBytecode
      Visits each entry of the stack map frames.
      Throws:
      BadBytecode

    • sameFrame

      public void sameFrame(int pos, int offsetDelta) throws BadBytecode
      Invoked if the visited frame is a same_frame or a same_frame_extended.
      Parameters:
      pos - the position of this frame in the info field of attribute_info structure.
      offsetDelta -
      Throws:
      BadBytecode

    • sameLocals

      public void sameLocals(int pos, int offsetDelta, int stackTag, int stackData) throws BadBytecode
      Invoked if the visited frame is a same_locals_1_stack_item_frame or a same_locals_1_stack_item_frame_extended.
      Parameters:
      pos - the position.
      offsetDelta -
      stackTag - stack[0].tag.
      stackData - stack[0].cpool_index if the tag is OBJECT, or stack[0].offset if the tag is UNINIT.
      Throws:
      BadBytecode

    • chopFrame

      public void chopFrame(int pos, int offsetDelta, int k) throws BadBytecode
      Invoked if the visited frame is a chop_frame.
      Parameters:
      pos - the position.
      offsetDelta -
      k - the k last locals are absent.
      Throws:
      BadBytecode

    • appendFrame

      public void appendFrame(int pos, int offsetDelta, int[] tags, int[] data) throws BadBytecode
      Invoked if the visited frame is a append_frame.
      Parameters:
      pos - the position.
      offsetDelta -
      tags - locals[i].tag.
      data - locals[i].cpool_index or locals[i].offset.
      Throws:
      BadBytecode

    • fullFrame

      public void fullFrame(int pos, int offsetDelta, int[] localTags, int[] localData, int[] stackTags, int[] stackData) throws BadBytecode
      Invoked if the visited frame is full_frame.
      Parameters:
      pos - the position.
      offsetDelta -
      localTags - locals[i].tag
      localData - locals[i].cpool_index or locals[i].offset
      stackTags - stack[i].tag
      stackData - stack[i].cpool_index or stack[i].offset
      Throws:
      BadBytecode

    • objectOrUninitialized

      public void objectOrUninitialized(int tag, int data, int pos)
      Invoked if Object_variable_info or Uninitialized_variable_info is visited.
      Parameters:
      tag - OBJECT or UNINIT.
      data - the value of cpool_index or offset.
      pos - the position of cpool_index or offset.