home | O'Reilly's CD bookshelfs | FreeBSD | Linux | Cisco | Cisco Exam    

Book HomeJava and XSLTSearch this book

8.15. B::Concise

A module that walks the Perl syntax tree, printing concise info about the internal OPs of a Perl program's syntax tree. The format of the information displayed is customizable. Its function is similar to that of Perl's -Dx debugging flag or the B::Terse module, but it is more sophisticated and flexible. Invoke as:

perl -MO=Concise[,options] program

program is the name of the Perl script to compile. Any non-option arguments are treated as the names of objects to be saved; the main program is assumed if there are no extra arguments. Possible options are:

Prints OPs in the order they appear in the OP tree (a preorder traversal, starting at the root). Default.

Prints OPs in the order they would normally execute. For the majority of constructs, this is a postorder traversal of the tree, ending at the root.

Prints OPs in a text approximation of a tree, with the root of the tree at the left and "left-to-right" order of children transformed into "top-to-bottom". Unsuitable for large programs.

Uses a tree format in which the minimum amount of space is used for the lines connecting nodes (one character in most cases).

Uses a tree format that uses longer edges to separate OP nodes. Default.

Uses tree-connecting characters drawn from the VT100 line-drawing set.

Draws the tree with standard ASCII characters such as + and |. Default.

Includes the main program in the output, even if subroutines were also specified.

Prints OP sequence numbers in base n, with n <= 62. The default is 36.

Prints sequence numbers with the most significant digit first. Default.

Prints sequence numbers with the least significant digit first.

Uses the author's favorite set of formatting conventions. Default.

Uses formatting conventions that emulate the output of B::Terse.

Uses formatting conventions in which the name of each OP, rather than written out in full, is represented by a one- or two-character abbreviation.

Uses formatting conventions reminiscient of B::Debug.

Uses formatting conventions read from the environment variables B_CONCISE_FORMAT, B_CONCISE_GOTO_FORMAT, and B_CONCISE_TREE_FORMAT.

Library Navigation Links

Copyright © 2002 O'Reilly & Associates. All rights reserved.