GraphTransformer

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org.jxcl.cl
Class GraphTransformer

java.lang.Object
  org.jxcl.cl.GraphTransformer

public class GraphTransformer
extends java.lang.Object

Build the control flow graph for a method, apply an arbitrary number of GraphXformers to it, and then collapse the graph back to an instruction list. Exception handlers are collected from the control flow graph and made available to callers.

XXX Debug statements should be removed when code is definitely stable. XXX

Field Summary

private org.apache.bcel.generic.CodeExceptionGen[] ceg
          Exception handlers from the transformed graph.

private java.util.List gxf
          GraphXformer vector; ordered list of graph processors.

private org.apache.bcel.generic.CodeExceptionGen[] handlers
          Exception handlers found in the method.

private org.apache.bcel.generic.InstructionList ilist
          Instruction list generated from the graph.

private TryStacks ts


Constructor Summary

GraphTransformer(java.util.List gxf)
          Creates method control flow graphs, applies application- specific transforms, and then collapses the graph to produce a new instruction list.

Method Summary

protected BytecodeCollector collapseGraph(ControlFlowGraph graph)
          Collapse a method control flow graph, writing bytecode back into the MethodGen data structures.

org.apache.bcel.generic.CodeExceptionGen[] getExceptionHandlers()
          Returns array of exception handlers, empty if the instruction list was null or there were no exception handlers.

static boolean hasInbound(org.apache.bcel.generic.InstructionHandle ih)
          Whether this instruction is target of branch instruction or starts catch block.

protected ControlFlowGraph makeGraph(org.apache.bcel.generic.ClassGen clazz, org.apache.bcel.generic.MethodGen method)
          Build the graph for the method.

org.apache.bcel.generic.InstructionList xform(org.apache.bcel.generic.ClassGen clazz, org.apache.bcel.generic.MethodGen method)
          Build a control flow graph for a method's instruction list, apply any transformers to it, and collapse the graph into a new instruction list.

private void zapGraphXformer(GraphXformer gxf, java.lang.Exception e)


Methods inherited from class java.lang.Object

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

Field Detail

gxf

private java.util.List gxf

GraphXformer vector; ordered list of graph processors.

ts

private TryStacks ts

handlers

private org.apache.bcel.generic.CodeExceptionGen[] handlers

Exception handlers found in the method.

ceg

private org.apache.bcel.generic.CodeExceptionGen[] ceg

Exception handlers from the transformed graph.

ilist

private org.apache.bcel.generic.InstructionList ilist

Instruction list generated from the graph.

Constructor Detail