FindBugs™ 1.3.9

edu.umd.cs.findbugs.ba
Class BlockTypeAnalysis

java.lang.Object
  extended by edu.umd.cs.findbugs.ba.BasicAbstractDataflowAnalysis<BlockType>
      extended by edu.umd.cs.findbugs.ba.BlockTypeAnalysis
All Implemented Interfaces:
DataflowAnalysis<BlockType>

public class BlockTypeAnalysis
extends BasicAbstractDataflowAnalysis<BlockType>

Dataflow analysis to determine the nesting of catch and finally blocks within a method.

Author:
David Hovemeyer
See Also:
BlockType

Constructor Summary
BlockTypeAnalysis(DepthFirstSearch dfs)
          Constructor.
 
Method Summary
 void copy(BlockType source, BlockType dest)
          Copy dataflow facts.
 BlockType createFact()
          Create empty (uninitialized) dataflow facts for one program point.
 BlockOrder getBlockOrder(CFG cfg)
          Return the BlockOrder specifying the order in which BasicBlocks should be visited in the main dataflow loop.
 void initEntryFact(BlockType result)
          Initialize the "entry" fact for the graph.
 boolean isForwards()
          Returns true if the analysis is forwards, false if backwards.
 boolean isTop(BlockType fact)
          Is the given fact the top value.
 void makeFactTop(BlockType fact)
          Make given fact the top value.
 void meetInto(BlockType fact, Edge edge, BlockType result)
          Meet a dataflow fact associated with an incoming edge into another fact.
 boolean same(BlockType fact1, BlockType fact2)
          Are given dataflow facts the same?
 void transfer(BasicBlock basicBlock, org.apache.bcel.generic.InstructionHandle end, BlockType start, BlockType result)
          Transfer function for the analysis.
 
Methods inherited from class edu.umd.cs.findbugs.ba.BasicAbstractDataflowAnalysis
edgeTransfer, factToString, finishIteration, getFactAfterLocation, getFactAtLocation, getFactOnEdge, getLastUpdateTimestamp, getResultFact, getStartFact, resultFactIterator, setLastUpdateTimestamp, startIteration
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

BlockTypeAnalysis

public BlockTypeAnalysis(DepthFirstSearch dfs)
Constructor.

Parameters:
dfs - a DepthFirstSearch for the method to be analyzed
Method Detail

createFact

public BlockType createFact()
Description copied from interface: DataflowAnalysis
Create empty (uninitialized) dataflow facts for one program point. A valid value will be copied into it before it is used.


copy

public void copy(BlockType source,
                 BlockType dest)
Description copied from interface: DataflowAnalysis
Copy dataflow facts.


initEntryFact

public void initEntryFact(BlockType result)
                   throws DataflowAnalysisException
Description copied from interface: DataflowAnalysis
Initialize the "entry" fact for the graph.

Throws:
DataflowAnalysisException

makeFactTop

public void makeFactTop(BlockType fact)
Description copied from interface: DataflowAnalysis
Make given fact the top value.


isTop

public boolean isTop(BlockType fact)
Description copied from interface: DataflowAnalysis
Is the given fact the top value.


isForwards

public boolean isForwards()
Description copied from interface: DataflowAnalysis
Returns true if the analysis is forwards, false if backwards.


getBlockOrder

public BlockOrder getBlockOrder(CFG cfg)
Description copied from interface: DataflowAnalysis
Return the BlockOrder specifying the order in which BasicBlocks should be visited in the main dataflow loop.

Parameters:
cfg - the CFG upon which we're performing dataflow analysis

same

public boolean same(BlockType fact1,
                    BlockType fact2)
Description copied from interface: DataflowAnalysis
Are given dataflow facts the same?


transfer

public void transfer(BasicBlock basicBlock,
                     @CheckForNull
                     org.apache.bcel.generic.InstructionHandle end,
                     BlockType start,
                     BlockType result)
              throws DataflowAnalysisException
Description copied from interface: DataflowAnalysis
Transfer function for the analysis. Taking dataflow facts at start (which might be either the entry or exit of the block, depending on whether the analysis is forwards or backwards), modify result to be the facts at the other end of the block.

Parameters:
basicBlock - the basic block
end - if nonnull, stop before considering this instruction; otherwise, consider all of the instructions in the basic block
start - dataflow facts at beginning of block (if forward analysis) or end of block (if backwards analysis)
result - resulting dataflow facts at other end of block
Throws:
DataflowAnalysisException

meetInto

public void meetInto(BlockType fact,
                     Edge edge,
                     BlockType result)
              throws DataflowAnalysisException
Description copied from interface: DataflowAnalysis
Meet a dataflow fact associated with an incoming edge into another fact. This is used to determine the start fact for a basic block.

Parameters:
fact - the predecessor fact (incoming edge)
edge - the edge from the predecessor
result - the result fact
Throws:
DataflowAnalysisException

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