NAME

B::Debugger - optree debugger

SYNOPSIS

  perl -MB::Debugger programm.pl
  B::Debugger 0.01 - optree debugger. h for help
  op 0 enter
  > n
  op 1 nextstate
  > h
  Usage:
  n     next op         d Debug of op
  c <n> continue        F Flags of op
  b <n> break at step   C Concise of op
  l <n> list            sv1,cv1,...
  x ..  execute         [SAHPICG]V<n> inspect n-th global variable
  h     help
  q     quit
  > b 5
  breakpoint 5 added
  > l
  -  <0> enter ->-
  -  <;> nextstate(main 111 test.pl:5) v:{ ->-
  -  <0> pushmark sM ->-  > c
  > q
  quit
  executing...

DESCRIPTION

  Start an optree inspector before the runtime execution begins, similar to
  the perl debugger, but only at the internal optree level, not the source
  level. Kind of interactive B::Concise.

  The ops are numbered and in exec order, starting from 0.

OPTIONS

None yet.

Planned:

  -exec      switch exec order
  -skip      skip BEGIN blocks (use modules, ...)
  -check     hook into CHECK block (Default, at B)
  -unit      hook into UNITCHECK block (after B)
  -init      hook into INIT block (before B)

COMMANDS

  n     goto the next op in current execution order
  n <n> skip over the next n ops
  s     step into kid if not next
  sib   step to next sibling
  c <n> continue. Optionally until op n
  l <x-y> list n ops or from x to y.
  h     help
  q     quit debugger, start execution
  F     list B::Flags op
  C     list B::Concise op
  D     list B::Debug op
  [sahpicg]v<n> inspect n-th global variable. eg. sv1

AUTHOR

Reini Urban rurban@cpan.org