/[jscoverage]/trunk/js/build/unix/mddepend.pl
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Contents of /trunk/js/build/unix/mddepend.pl

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Tue Dec 9 03:37:47 2008 UTC (11 years, 2 months ago) by siliconforks
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1 #!/usr/bin/env perl
2
3 # ***** BEGIN LICENSE BLOCK *****
4 # Version: MPL 1.1/GPL 2.0/LGPL 2.1
5 #
6 # The contents of this file are subject to the Mozilla Public License Version
7 # 1.1 (the "License"); you may not use this file except in compliance with
8 # the License. You may obtain a copy of the License at
9 # http://www.mozilla.org/MPL/
10 #
11 # Software distributed under the License is distributed on an "AS IS" basis,
12 # WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13 # for the specific language governing rights and limitations under the
14 # License.
15 #
16 # The Original Code is this file as it was released upon March 8, 1999.
17 #
18 # The Initial Developer of the Original Code is
19 # Netscape Communications Corporation.
20 # Portions created by the Initial Developer are Copyright (C) 1999
21 # the Initial Developer. All Rights Reserved.
22 #
23 # Contributor(s):
24 #
25 # Alternatively, the contents of this file may be used under the terms of
26 # either of the GNU General Public License Version 2 or later (the "GPL"),
27 # or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
28 # in which case the provisions of the GPL or the LGPL are applicable instead
29 # of those above. If you wish to allow use of your version of this file only
30 # under the terms of either the GPL or the LGPL, and not to allow others to
31 # use your version of this file under the terms of the MPL, indicate your
32 # decision by deleting the provisions above and replace them with the notice
33 # and other provisions required by the GPL or the LGPL. If you do not delete
34 # the provisions above, a recipient may use your version of this file under
35 # the terms of any one of the MPL, the GPL or the LGPL.
36 #
37 # ***** END LICENSE BLOCK *****
38
39 # mddepend.pl - Reads in dependencies generated my -MD flag. Prints list
40 # of objects that need to be rebuilt. These can then be added to the
41 # PHONY target. Using this script copes with the problem of header
42 # files that have been removed from the build.
43 #
44 # Usage:
45 # mddepend.pl <output_file> <dependency_files...>
46 #
47 # Send comments, improvements, bugs to Steve Lamm (slamm@netscape.com).
48
49 use strict;
50
51 use constant DEBUG => 0;
52
53 my $outfile = shift @ARGV;
54 my $silent = $ENV{MAKEFLAGS} =~ /^\w*s|\s-s/;
55
56 my $line = '';
57 my %alldeps;
58 # Parse dependency files
59 while (<>) {
60 s/\r?\n$//; # Handle both unix and DOS line endings
61 $line .= $_;
62 if ($line =~ /\\$/) {
63 chop $line;
64 next;
65 }
66
67 my ($obj,$rest) = split /\s*:\s+/, $line, 2;
68 $line = '';
69 next if !$obj || !$rest;
70
71 my @deps = split /\s+/, $rest;
72 push @{$alldeps{$obj}}, @deps;
73 if (DEBUG >= 2) {
74 foreach my $dep (@deps) { print "add $obj $dep\n"; }
75 }
76 }
77
78 # Test dependencies
79 my %modtimes; # cache
80 my @objs; # force rebuild on these
81 OBJ_LOOP: foreach my $obj (keys %alldeps) {
82 my $mtime = (stat $obj)[9] or next;
83
84 my %not_in_cache;
85 my $deps = $alldeps{$obj};
86 foreach my $dep_file (@{$deps}) {
87 my $dep_mtime = $modtimes{$dep_file};
88 if (not defined $dep_mtime) {
89 print "Skipping $dep_file for $obj, will stat() later\n" if DEBUG >= 2;
90 $not_in_cache{$dep_file} = 1;
91 next;
92 }
93
94 print "Found $dep_file in cache\n" if DEBUG >= 2;
95
96 if ($dep_mtime > $mtime) {
97 print "$dep_file($dep_mtime) newer than $obj($mtime)\n" if DEBUG;
98 }
99 elsif ($dep_mtime == -1) {
100 print "Couldn't stat $dep_file for $obj\n" if DEBUG;
101 }
102 else {
103 print "$dep_file($dep_mtime) older than $obj($mtime)\n" if DEBUG >= 2;
104 next;
105 }
106
107 push @objs, $obj; # dependency is missing or newer
108 next OBJ_LOOP; # skip checking the rest of the dependencies
109 }
110
111 foreach my $dep_file (keys %not_in_cache) {
112 print "STAT $dep_file for $obj\n" if DEBUG >= 2;
113 my $dep_mtime = $modtimes{$dep_file} = (stat $dep_file)[9] || -1;
114
115 if ($dep_mtime > $mtime) {
116 print "$dep_file($dep_mtime) newer than $obj($mtime)\n" if DEBUG;
117 }
118 elsif ($dep_mtime == -1) {
119 print "Couldn't stat $dep_file for $obj\n" if DEBUG;
120 }
121 else {
122 print "$dep_file($dep_mtime) older than $obj($mtime)\n" if DEBUG >= 2;
123 next;
124 }
125
126 push @objs, $obj; # dependency is missing or newer
127 next OBJ_LOOP; # skip checking the rest of the dependencies
128 }
129
130 # If we get here it means nothing needs to be done for $obj
131 }
132
133 # Output objects to rebuild (if needed).
134 if (@objs) {
135 my $old_output;
136 my $new_output = "@objs: FORCE\n";
137
138 # Read in the current dependencies file.
139 open(OLD, "<$outfile")
140 and $old_output = <OLD>;
141 close(OLD);
142
143 # Only write out the dependencies if they are different.
144 if ($new_output ne $old_output) {
145 open(OUT, ">$outfile") and print OUT "$new_output";
146 print "Updating dependencies file, $outfile\n" unless $silent;
147 if (DEBUG) {
148 print "new: $new_output\n";
149 print "was: $old_output\n" if $old_output ne '';
150 }
151 }
152 } elsif (-s $outfile) {
153 # Remove the old dependencies because all objects are up to date.
154 print "Removing old dependencies file, $outfile\n" unless $silent;
155
156 if (DEBUG) {
157 my $old_output;
158 open(OLD, "<$outfile")
159 and $old_output = <OLD>;
160 close(OLD);
161 print "was: $old_output\n";
162 }
163
164 unlink $outfile;
165 }

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