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:
- -basic
-
Prints OPs in the order they appear in the OP tree (a preorder
traversal, starting at the root). Default.
- -exec
-
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.
- -tree
-
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.
- -compact
-
Uses a tree format in which the minimum amount of space is used for
the lines connecting nodes (one character in most cases).
- -loose
-
Uses a tree format that uses longer edges to separate OP nodes.
Default.
- -vt
-
Uses tree-connecting characters drawn from the VT100 line-drawing set.
- -ascii
-
Draws the tree with standard ASCII characters such as
+ and |. Default.
- -main
-
Includes the main program in the output, even if subroutines were
also specified.
- -basen
-
Prints OP sequence numbers in base n, with n <= 62. The default is
36.
- -bigendian
-
Prints sequence numbers with the most significant digit first.
Default.
- -littleendian
-
Prints sequence numbers with the least significant digit first.
- -concise
-
Uses the author's favorite set of formatting
conventions. Default.
- -terse
-
Uses formatting conventions that emulate the output of B::Terse.
- -linenoise
-
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.
- -debug
-
Uses formatting conventions reminiscient of B::Debug.
- -env
-
Uses formatting conventions read from the environment variables
B_CONCISE_FORMAT, B_CONCISE_GOTO_FORMAT, and B_CONCISE_TREE_FORMAT.
 |  |  |
| 8.14. B::CC |  | 8.16. B::Debug |
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