Package javassist.bytecode

Class StackMapTable.Walker

  • Enclosing class:
    StackMapTable
    public static class StackMapTable.Walker
extends java.lang.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

      All Methods Instance Methods Concrete Methods 
      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.
      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 Detail

      • 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 Detail

      • 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.