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r1 - 26 May 2008 - TWikiGuest

NAME

B::Bblock - Walk basic blocks

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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);

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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. Somebody who understands the stand-alone options document them, please.

Functions

find_leaders
  my $leaders = find_leaders($root_op, $start_op);
Given the root of the op tree and an op from which to start
processing, it will return a hash ref representing all the ops which
start a block.
The above description may be somewhat wrong. The values of %$leaders are the op objects themselves. Keys are $$op addresses. Above cribbed from B::CC's comments. What's a $$op address?

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AUTHOR

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

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