org.jikesrvm.compilers.opt.controlflow
Class DominatorInfo

java.lang.Object
  org.jikesrvm.compilers.opt.controlflow.DominatorInfo

public class DominatorInfo
extends Object

DominatorInfo.java This structure holds dominator-related information for a basic block.

dominators

final BitVector dominators

A BitVector which represents the dominators of the basic block

idom

BasicBlock idom

The basic block's immediate dominator.

DominatorInfo

DominatorInfo(BitVector dominators)

Make a structure with a given bit set holding the dominators of the basic block.

Parameters:

dominators - the bit set

idom

public static BasicBlock idom(BasicBlock bb)

Return the immediate dominator of a basic block.

Note: the dominator info must be calculated before calling this routine

Parameters:

bb - the basic block in question

Returns:

bb's immediate dominator, as cached in bb's DominatorInfo

isDominatedBy

public boolean isDominatedBy(BasicBlock bb)

Is the basic block represented by this structure dominated by another basic block?

Parameters:

bb - the basic block in question

Returns:

true or false

isDominatedBy

static boolean isDominatedBy(BasicBlock slave,
                             BasicBlock master)

Is one basic block (the slave) dominated by another (the master)?

Parameters:

slave - the potential dominatee

master - the potential dominator

Returns:

true or false