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1#!/usr/bin/perl
2
3# Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
4#
5# Redistribution and use in source and binary forms, with or without
6# modification, are permitted provided that the following conditions
7# are met:
8#
9# 1.  Redistributions of source code must retain the above copyright
10#     notice, this list of conditions and the following disclaimer.
11# 2.  Redistributions in binary form must reproduce the above copyright
12#     notice, this list of conditions and the following disclaimer in the
13#     documentation and/or other materials provided with the distribution.
14# 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
15#     its contributors may be used to endorse or promote products derived
16#     from this software without specific prior written permission.
17#
18# THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
19# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21# DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
22# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29# "check-for-weak-vtables" script for WebKit Open Source Project
30
31# Intended to be invoked from an Xcode build step to check if there are
32# any weak vtables in a target.
33
34use warnings;
35use strict;
36
37use File::Basename;
38
39sub touch($);
40
41my $arch = $ENV{'CURRENT_ARCH'};
42my $configuration = $ENV{'CONFIGURATION'};
43my $target = $ENV{'TARGET_NAME'};
44my $variant = $ENV{'CURRENT_VARIANT'};
45my $coverageBuild = $ENV{'WEBKIT_COVERAGE_BUILD'};
46my $debugRoot = $ENV{'WEBKIT_DEBUG_ROOT'};
47
48$arch = $ENV{'NATIVE_ARCH'} if !$arch; # for Xcode 2.1, which does not have CURRENT_ARCH
49$variant = "normal" if !$variant; # for Xcode 2.1, which does not have CURRENT_VARIANT
50
51my $executablePath = "$ENV{'TARGET_BUILD_DIR'}/$ENV{'EXECUTABLE_PATH'}";
52
53my $buildTimestampPath = $ENV{'TARGET_TEMP_DIR'} . "/" . basename($0) . ".timestamp";
54my $buildTimestampAge = -M $buildTimestampPath;
55my $executablePathAge = -M $executablePath;
56
57my $sawError = 0;
58
59if (!defined $executablePathAge || !defined $buildTimestampAge || $executablePathAge > $buildTimestampAge) {
60    if (!open NM, "(nm -m '$executablePath' | c++filt | sed 's/^/STDOUT:/') 2>&1 |") {
61        print "ERROR: Could not open $executablePath\n";
62        $sawError = 1;
63        next;
64    }
65    my @weakVTableClasses = ();
66    while (<NM>) {
67        if (/^STDOUT:/) {
68            push @weakVTableClasses, $1 if /weak external vtable for (.*)$/;
69        } else {
70            print STDERR if $_ ne "nm: no name list\n";
71        }
72    }
73    close NM;
74    if (@weakVTableClasses) {
75        my $shortName = $executablePath;
76        $shortName =~ s/.*\///;
77
78        print "ERROR: $shortName has a weak vtable in it ($executablePath)\n";
79        print "ERROR: Fix by making sure the first virtual function in each of these classes is not an inline:\n";
80        for my $class (sort @weakVTableClasses) {
81            print "ERROR: class $class\n";
82        }
83        $sawError = 1;
84    }
85}
86
87if ($sawError and !$coverageBuild) {
88    unlink $executablePath;
89    exit 1;
90}
91
92touch($buildTimestampPath);
93
94exit 0;
95
96sub touch($)
97{
98    my ($path) = @_;
99    open(TOUCH, ">", $path) or die "$!";
100    close(TOUCH);
101}
102