<box begindoc>**This is automatically generated documentation.**  Edit after the "[[#COMMENTS|COMMENTS]]" heading; changes to the main body will be lost.</box>

====== click-devirtualize ======

removes virtual function calls from a Click configuration

===== SYNOPSIS =====

**click-devirtualize** 
[//options//]
[//param//=//value// ...]
[//router-file//]

===== DESCRIPTION =====

The
**click-devirtualize** 
tool speeds up a Click configuration by removing virtual function calls
from its elements. It reads a router configuration file in the
[[language]]
language and creates specialized C%%+%%+ source code for each element. The
virtual function calls in this specialized C%%+%%+ code are replaced with
direct function calls to other elements in the configuration.

After creating the source code,
**click-devirtualize** 
will optionally compile it into dynamically loadable packages. The elements
in the input configuration are changed to use new, specially generated
element classes, and the resulting configuration, plus source code and any
compiled packages, are combined into an archive and written to the standard
output. You can install such an archive into the
[[linuxmodule]]
Linux kernel module with
[[click-install]]:\\
\\

    % click-devirtualize -k CONFIGURATION | click-install

The
[[userdriver]]
user level driver can read the archives directly.

The
**click-devirtualize** 
transformation can be reversed with the
**--reverse** 
option.

===== OPTIONS =====

If any filename argument is a single dash "-",
**click-devirtualize** 
will use the standard input or output instead, as appropriate.

 ? **-f** //file// \\ **--file** //file//
 ! Read the router configuration to transform from //file//. The default is the standard input.
 ? **-e** //expr// \\ **--expr** //expr//
 ! Use //expr//, a string in the Click language, as the router configuration to transform.
 ? **-o** //file// \\ **--output** //file//
 ! Write the output router configuration to //file//. The default is the standard output.
 ? **-l**, **--linuxmodule**
 ! Generate a dynamically loadable package for the [[linuxmodule]] Linux kernel module.
 ? **-u**, **--userlevel**
 ! Generate a dynamically loadable package for the [[userdriver]] user-level driver.
 ? **-s**, **--source**
 ! Output only the specialized element class source code.
 ? **-c**, **--config**
 ! Output only the new configuration (the one that includes specialized elements).
 ? **-r**, **--reverse**
 ! Reverse the tranformation. That is, change any existing devirtualized  element classes into the equivalent normal elements.
 ? **-n** //class// \\ **--no-devirtualize** //class//
 ! Do not devirtualize elements whose element class is //class//. Such elements will continue using normal source code.
 ? **-i** //file// \\ **--instructions** //file//
 ! Read devirtualization instructions from //file//. This file can contain any number of lines. Comments start with '#'; non-blank, non-comment lines should have devirtualization directives. There is currently one directive: "noclass //class1 class2//..." is equivalent to several '--no-devirtualize //class//i' options.
 ? **--help**
 ! Print usage information and exit.
 ? **--version**
 ! Print the version number and some quickie warranty information and exit.

===== SEE ALSO =====

[[userdriver]],
[[click-install]],
[[language]],
[[linuxmodule]]

===== AUTHOR =====

Eddie Kohler, kohler@cs.ucla.edu\\
[[http://www.pdos.lcs.mit.edu/click/|http://www.pdos.lcs.mit.edu/click/]]


===== COMMENTS =====