kernel-doc

ARM 嵌入式 系统 设计与实例开发 实验教材 二源码

#!/usr/bin/perl -w

use strict;

## Copyright (c) 1998 Michael Zucchi, All Rights Reserved        ##
## Copyright (C) 2000, 1  Tim Waugh <[e-mail]>          ##
## Copyright (C) 2001  Simon Huggins                             ##
## 								 ##
## #define enhancements by Armin Kuster <[e-mail]>	 ##
## Copyright (c) 2000 MontaVista Software, Inc.			 ##
## 								 ##
## This software falls under the GNU General Public License.     ##
## Please read the COPYING file for more information             ##

# w.o. 03-11-2000: added the '-filelist' option.

# 18/01/2001 - 	Cleanups
# 		Functions prototyped as foo(void) same as foo()
# 		Stop eval'ing where we don't need to.
# -- [e-mail]

# 27/06/2001 -  Allowed whitespace after initial "/**" and
#               allowed comments before function declarations.
# -- Christian Kreibich <[e-mail]>

# Still to do:
# 	- add perldoc documentation
# 	- Look more closely at some of the scarier bits :)

# 26/05/2001 - 	Support for separate source and object trees.
#		Return error code.
# 		Keith Owens <[e-mail]>

# 23/09/2001 - Added support for typedefs, structs, enums and unions
#              Support for Context section; can be terminated using empty line
#              Small fixes (like spaces vs. \s in regex)
# -- Tim Jansen <[e-mail]>


#
# This will read a 'c' file and scan for embedded comments in the
# style of gnome comments (+minor extensions - see below).
#

# Note: This only supports 'c'.

# usage:
# kerneldoc [ -docbook | -html | -text | -man ]
#           [ -function funcname [ -function funcname ...] ] c file(s)s > outputfile
# or
#           [ -nofunction funcname [ -function funcname ...] ] c file(s)s > outputfile
#
#  Set output format using one of -docbook -html -text or -man.  Default is man.
#
#  -function funcname
#	If set, then only generate documentation for the given function(s).  All
#	other functions are ignored.
#
#  -nofunction funcname
#	If set, then only generate documentation for the other function(s).  All
#	other functions are ignored. Cannot be used with -function together
#	(yes thats a bug - perl hackers can fix it 8))
#
#  c files - list of 'c' files to process
#
#  All output goes to stdout, with errors to stderr.

#
# format of comments.
# In the following table, (...)? signifies optional structure.
#                         (...)* signifies 0 or more structure elements
# /**
#  * function_name(:)? (- short description)?
# (* @parameterx: (description of parameter x)?)*
# (* a blank line)?
#  * (Description:)? (Description of function)?
#  * (section header: (section description)? )*
#  (*)?*/
#
# So .. the trivial example would be:
#
# /**
#  * my_function
#  **/
#
# If the Description: header tag is ommitted, then there must be a blank line
# after the last parameter specification.
# e.g.
# /**
#  * my_function - does my stuff
#  * @my_arg: its mine damnit
#  *
#  * Does my stuff explained. 
#  */
#
#  or, could also use:
# /**
#  * my_function - does my stuff
#  * @my_arg: its mine damnit
#  * Description: Does my stuff explained. 
#  */
# etc.
#
# Beside functions you can also write documentation for structs, unions, 
# enums and typedefs. Instead of the function name you must write the name 
# of the declaration;  the struct/union/enum/typedef must always precede 
# the name. Nesting of declarations is not supported. 
# Use the argument mechanism to document members or constants. In 
# structs and unions you must declare one member per declaration 
# (comma-separated members are not allowed -  the parser does not support 
# this).
# e.g.
# /**
#  * struct my_struct - short description
#  * @a: first member
#  * @b: second member
#  * 
#  * Longer description
#  */
# struct my_struct {
#     int a;
#     int b;
# };
#
# All descriptions can be multiline, except the short function description.
# 
# You can also add additional sections. When documenting kernel functions you 
# should document the "Context:" of the function, e.g. whether the functions 
# can be called form interrupts. Unlike other sections you can end it with an
# empty line. 
# Example-sections should contain the string EXAMPLE so that they are marked 
# appropriately in DocBook.
#
# Example:
# /**
#  * user_function - function that can only be called in user context
#  * @a: some argument
#  * Context: !in_interrupt()
#  * 
#  * Some description
#  * Example:
#  *    user_function(22);
#  */
# ...
#
#
# All descriptive text is further processed, scanning for the following special
# patterns, which are highlighted appropriately.
#
# 'funcname()' - function
# '$ENVVAR' - environmental variable
# '&struct_name' - name of a structure (up to two words including 'struct')
# '@parameter' - name of a parameter
# '%CONST' - name of a constant.

my $errors = 0;

# match expressions used to find embedded type information
my $type_constant = '\%([-_\w]+)';
my $type_func = '(\w+)\(\)';
my $type_param = '\@(\w+)';
my $type_struct = '\&((struct\s*)?[_\w]+)';
my $type_env = '(\$\w+)';

# Output conversion substitutions.
#  One for each output format

# these work fairly well
my %highlights_html = ( $type_constant, "<i>\$1</i>",
			$type_func, "<b>\$1</b>",
			$type_struct, "<i>\$1</i>",
			$type_param, "<tt><b>\$1</b></tt>" );
my $blankline_html = "<p>";

# sgml, docbook format
my %highlights_sgml = ( "([^=])\\\"([^\\\"<]+)\\\"", "\$1<quote>\$2</quote>",
			$type_constant, "<constant>\$1</constant>",
			$type_func, "<function>\$1</function>",
			$type_struct, "<structname>\$1</structname>",
			$type_env, "<envar>\$1</envar>",
			$type_param, "<parameter>\$1</parameter>" );
my $blankline_sgml = "</para><para>\n";

# gnome, docbook format
my %highlights_gnome = ( $type_constant, "<replaceable class=\"option\">\$1</replaceable>",
			 $type_func, "<function>\$1</function>",
			 $type_struct, "<structname>\$1</structname>",
			 $type_env, "<envar>\$1</envar>",
			 $type_param, "<parameter>\$1</parameter>" );
my $blankline_gnome = "</para><para>\n";

# these are pretty rough
my %highlights_man = ( $type_constant, "\$1",
		       $type_func, "\\\\fB\$1\\\\fP",
		       $type_struct, "\\\\fI\$1\\\\fP",
		       $type_param, "\\\\fI\$1\\\\fP" );
my $blankline_man = "";

# text-mode
my %highlights_text = ( $type_constant, "\$1",
			$type_func, "\$1",
			$type_struct, "\$1",
			$type_param, "\$1" );
my $blankline_text = "";


sub usage {
    print "Usage: $0 [ -v ] [ -docbook | -html | -text | -man ]\n";
    print "         [ -function funcname [ -function funcname ...] ]\n";
    print "         [ -nofunction funcname [ -nofunction funcname ...] ]\n";
    print "         c source file(s) > outputfile\n";
    exit 1;
}

# read arguments
if ($#ARGV==-1) {
    usage();
}

my $verbose = 0;
my $output_mode = "man";
my %highlights = %highlights_man;
my $blankline = $blankline_man;
my $modulename = "Kernel API";
my $function_only = 0;
my $man_date = ('January', 'February', 'March', 'April', 'May', 'June', 
		'July', 'August', 'September', 'October', 
		'November', 'December')[(localtime)[4]] . 
  " " . ((localtime)[5]+1900);

# Essentially these are globals
# They probably want to be tidied up made more localised or summat.
# CAVEAT EMPTOR!  Some of the others I localised may not want to be which
# could cause "use of undefined value" or other bugs.
my ($function, %function_table,%parametertypes,$declaration_purpose);
my ($type,$file,$declaration_name,$return_type);
my ($newsection,$newcontents,$prototype,$filelist, $brcount, %source_map);

my $lineprefix="";

# states
# 0 - normal code
# 1 - looking for function name
# 2 - scanning field start.
# 3 - scanning prototype.
# 4 - documentation block
my $state;

#declaration types: can be
# 'function', 'struct', 'union', 'enum', 'typedef'
my $decl_type;

my $doc_special = "\@\%\$\&";

my $doc_start = '^/\*\*\s*$'; # Allow whitespace at end of comment start.
my $doc_end = '\*/';
my $doc_com = '\s*\*\s*';
my $doc_decl = $doc_com.'(\w+)';
my $doc_sect = $doc_com.'(['.$doc_special.']?[\w ]+):(.*)';
my $doc_content = $doc_com.'(.*)';
my $doc_block = $doc_com.'DOC:\s*(.*)?';

my %constants;
my %parameterdescs;
my @parameterlist;
my %sections;
my @sectionlist;

my $contents = "";
my $section_default = "Description";	# default section
my $section_intro = "Introduction";
my $section = $section_default;
my $section_context = "Context";

my $undescribed = "-- undescribed --";

reset_state();

while ($ARGV[0] =~ m/^-(.*)/) {
    my $cmd = shift @ARGV;
    if ($cmd eq "-html") {
	$output_mode = "html";
	%highlights = %highlights_html;
	$blankline = $blankline_html;
    } elsif ($cmd eq "-man") {
	$output_mode = "man";
	%highlights = %highlights_man;
	$blankline = $blankline_man;
    } elsif ($cmd eq "-text") {
	$output_mode = "text";
	%highlights = %highlights_text;
	$blankline = $blankline_text;
    } elsif ($cmd eq "-docbook") {
	$output_mode = "sgml";
	%highlights = %highlights_sgml;
	$blankline = $blankline_sgml;
    } elsif ($cmd eq "-gnome") {
	$output_mode = "gnome";
	%highlights = %highlights_gnome;
	$blankline = $blankline_gnome;
    } elsif ($cmd eq "-module") { # not needed for sgml, inherits from calling document
	$modulename = shift @ARGV;
    } elsif ($cmd eq "-function") { # to only output specific functions
	$function_only = 1;
	$function = shift @ARGV;
	$function_table{$function} = 1;
    } elsif ($cmd eq "-nofunction") { # to only output specific functions
	$function_only = 2;
	$function = shift @ARGV;
	$function_table{$function} = 1;
    } elsif ($cmd eq "-v") {
	$verbose = 1;
    } elsif (($cmd eq "-h") || ($cmd eq "--help")) {
	usage();
    } elsif ($cmd eq '-filelist') {
	    $filelist = shift @ARGV;
    }
}


# generate a sequence of code that will splice in highlighting information
# using the s// operator.
my $dohighlight = "";
foreach my $pattern (keys %highlights) {
#    print "scanning pattern $pattern ($highlights{$pattern})\n";
    $dohighlight .=  "\$contents =~ s:$pattern:$highlights{$pattern}:gs;\n";
}

##
# dumps section contents to arrays/hashes intended for that purpose.
#
sub dump_section {
    my $name = shift;
    my $contents = join "\n", @_;

    if ($name =~ m/$type_constant/) {
	$name = $1;
#	print STDERR "constant section '$1' = '$contents'\n";
	$constants{$name} = $contents;
    } elsif ($name =~ m/$type_param/) {
#	print STDERR "parameter def '$1' = '$contents'\n";
	$name = $1;
	$parameterdescs{$name} = $contents;
    } else {
#	print STDERR "other section '$name' = '$contents'\n";
	$sections{$name} = $contents;
	push @sectionlist, $name;
    }
}

##
# output function
#
# parameterdescs, a hash.
#  function => "function name"
#  parameterlist => @list of parameters
#  parameterdescs => %parameter descriptions
#  sectionlist => @list of sections
#  sections => %descriont descriptions
#  

sub output_highlight {
    my $contents = join "\n",@_;
    my $line;

#   DEBUG
#   if (!defined $contents) {
#	use Carp;
#	confess "output_highlight got called with no args?\n";
#   }

    eval $dohighlight;
    die $@ if $@;
    foreach $line (split "\n", $contents) {
      if ($line eq ""){
	    print $lineprefix, $blankline;
	} else {
            $line =~ s/\\\\\\/\&/g;
	    print $lineprefix, $line;
	}
	print "\n";
    }
}

#output sections in html
sub output_section_html(%) {
    my %args = %{$_[0]};
    my $section;

    foreach $section (@{$args{'sectionlist'}}) {
	print "<h3>$section</h3>\n";
	print "<blockquote>\n";
	output_highlight($args{'sections'}{$section});
	print "</blockquote>\n";
    }  
}

# output enum in html
sub output_enum_html(%) {
    my %args = %{$_[0]};
    my ($parameter);
    my $count;
    print "<h2>enum ".$args{'enum'}."</h2>\n";

    print "<b>enum ".$args{'enum'}."</b> {<br>\n";
    $count = 0;
    foreach $parameter (@{$args{'parameterlist'}}) {
        print " <b>".$parameter."</b>";
	if ($count != $#{$args{'parameterlist'}}) {
	    $count++;
	    print ",\n";
	}
	print "<br>";
    }
    print "};<br>\n";

    print "<h3>Constants</h3>\n";
    print "<dl>\n";
    foreach $parameter (@{$args{'parameterlist'}}) {
	print "<dt><b>".$parameter."</b>\n";
	print "<dd>";
	output_highlight($args{'parameterdescs'}{$parameter});
    }
    print "</dl>\n";
    output_section_html(@_);
    print "<hr>\n";
}

# output tyepdef in html
sub output_typedef_html(%) {
    my %args = %{$_[0]};
    my ($parameter);
    my $count;
    print "<h2>typedef ".$args{'typedef'}."</h2>\n";

    print "<b>typedef ".$args{'typedef'}."</b>\n";
    output_section_html(@_);
    print "<hr>\n";
}

# output struct in html
sub output_struct_html(%) {
    my %args = %{$_[0]};
    my ($parameter);

    print "<h2>".$args{'type'}." ".$args{'struct'}."</h2>\n";
    print "<b>".$args{'type'}." ".$args{'struct'}."</b> {<br>\n";
    foreach $parameter (@{$args{'parameterlist'}}) {
        ($args{'parameterdescs'}{$parameter} ne $undescribed) || next;
	$type = $args{'parametertypes'}{$parameter};
	if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
	    # pointer-to-function
	    print " <i>$1</i><b>$parameter</b>) <i>($2)</i>;<br>\n";
	} elsif ($type =~ m/^(.*?)\s*(:.*)/) {
	    print " <i>$1</i> <b>$parameter</b>$2;<br>\n";
	} else {
	    print " <i>$type</i> <b>$parameter</b>;<br>\n";
	}
    }
    print "};<br>\n";

    print "<h3>Members</h3>\n";
    print "<dl>\n";
    foreach $parameter (@{$args{'parameterlist'}}) {
        ($args{'parameterdescs'}{$parameter} ne $undescribed) || next;
	print "<dt><b>".$parameter."</b>\n";
	print "<dd>";
	output_highlight($args{'parameterdescs'}{$parameter});
    }
    print "</dl>\n";
    output_section_html(@_);
    print "<hr>\n";
}

# output function in html
sub output_function_html(%) {
    my %args = %{$_[0]};
    my ($parameter, $section);
    my $count;
    print "<h2>Function</h2>\n";

    print "<i>".$args{'functiontype'}."</i>\n";
    print "<b>".$args{'function'}."</b>\n";
    print "(";
    $count = 0;
    foreach $parameter (@{$args{'parameterlist'}}) {
	$type = $args{'parametertypes'}{$parameter};
	if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
	    # pointer-to-function
	    print "<i>$1</i><b>$parameter</b>) <i>($2)</i>";
	} else {
	    print "<i>".$type."</i> <b>".$parameter."</b>";
	}
	if ($count != $#{$args{'parameterlist'}}) {
	    $count++;
	    print ",\n";
	}
    }
    print ")\n";

    print "<h3>Arguments</h3>\n";
    print "<dl>\n";
    foreach $parameter (@{$args{'parameterlist'}}) {
        ($args{'parameterdescs'}{$parameter} ne $undescribed) || next;
	print "<dt><b>".$parameter."</b>\n";
	print "<dd>";
	output_highlight($args{'parameterdescs'}{$parameter});
    }
    print "</dl>\n";
    output_section_html(@_);
    print "<hr>\n";
}

# output intro in html
sub output_intro_html(%) {
    my %args = %{$_[0]};
    my ($parameter, $section);
    my $count;

    foreach $section (@{$args{'sectionlist'}}) {
	print "<h3>$section</h3>\n";
	print "<ul>\n";
	output_highlight($args{'sections'}{$section});
	print "</ul>\n";
    }
    print "<hr>\n";
}

sub output_section_sgml(%) {
    my %args = %{$_[0]};
    my $section;    
    # print out each section
    $lineprefix="   ";
    foreach $section (@{$args{'sectionlist'}}) {
	print "<refsect1>\n <title>$section</title>\n <para>\n";
	if ($section =~ m/EXAMPLE/i) {
	    print "<example><para>\n";
	}
	output_highlight($args{'sections'}{$section});
	if ($section =~ m/EXAMPLE/i) {
	    print "</para></example>\n";
	}
	print " </para>\n</refsect1>\n";
    }
}

# output function in sgml DocBook
sub output_function_sgml(%) {
    my %args = %{$_[0]};
    my ($parameter, $section);
    my $count;
    my $id;

    $id = "API-".$args{'function'};
    $id =~ s/[^A-Za-z0-9]/-/g;

    print "<refentry>\n";
    print "<refmeta>\n";
    print "<refentrytitle><phrase id=\"$id\">".$args{'function'}."</phrase></refentrytitle>\n";