org.quilt.cl
Class TryStacks

java.lang.Object
  |
  +--org.quilt.cl.TryStacks

public class TryStacks

extends java.lang.Object

Manages try/catch blocks. Adds subgraphs to the method graph for each exception handler, building the graph that GraphTransformer hangs bytecode off. This module must cope with the fact that the compiler allocates exception handlers in no particular order. Hacked from earlier 0.5-compatible code.

Author:

< a href="jdd@dixons.org">Jim Dixon

Constructor Summary

TryStacks(org.apache.bcel.generic.CodeExceptionGen[] handlers, SortedBlocks blocks, ControlFlowGraph g)
Constructor setting up try/catch arrays.

Method Summary

CatchData[]	getCatchData() Return an array of CatchData, with vertices for the beginning and end of the try block, a vertex for the handler, and the exception handled.
java.util.Comparator	getComparator() Return the class TryStack uses to sort exception handlers.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

TryStacks

public TryStacks(org.apache.bcel.generic.CodeExceptionGen[] handlers,
                 SortedBlocks blocks,
                 ControlFlowGraph g)

Constructor setting up try/catch arrays. Sorts the exception handlers and then builds a nested control flow graph, including the first code vertex in each try block who first vertex is a code vertex.

Parameters:

handlers - Array of exception handlers for a method.

blocks - Vertices indexed by position in bytecode (?).

g - Graph for the method.

Method Detail

getCatchData

public CatchData[] getCatchData()

Return an array of CatchData, with vertices for the beginning and end of the try block, a vertex for the handler, and the exception handled.

Returns:

Catch handler descriptions for the graph.

getComparator

public java.util.Comparator getComparator()

Return the class TryStack uses to sort exception handlers.

Returns:

The comparator used to sort handlers.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

Returns:

Newline-terminated string description of try blocks and handlers.