Manual Reference Pages  - B::Bblock (3pm)

NAME

B::Bblock - Walk basic blocks

CONTENTS

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 B::Bblock (3pm) 2001-09-21
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