


ext::B::B::BblockPerl Programmers Reference ext::B::B::Bblock(3p)


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
       possiblity 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 represent-
           ing 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"






















perl v5.8.2                 2002-11-06                          1


