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B::Bblock(3)


NAME

  B::Bblock - Walk basic blocks


SYNOPSIS

    # External interface
    perl -MO=Bblock[,OPTIONS] foo.pl

    # Programmatic API
    use B::Bblock qw(find_leaders);
    my $leaders = find_leaders($root_op, $start_op);


DESCRIPTION

  This module is used by the B::CC back end.  It walks "basic blocks".	A
  basic block is a series of operations which is known to execute from start
  to finish, with no possibility of branching or halting.

  It can be used either stand alone or from inside another program.

  Functions

  find_leaders
	my $leaders = find_leaders($root_op, $start_op);

      Given the root of the op tree and an op from which to start processing,
      it will return a hash ref representing all the ops which start a block.

      The values of %$leaders are the op objects themselves.  Keys are $$op
      addresses.


AUTHOR

  Malcolm Beattie, "mbeattie@sable.ox.ac.uk"

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