MirOS Manual: B::Bblock(3p)


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 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"

perl v5.8.8                2005-02-05                           1

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