1# Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved
2# Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
3# Copyright (C) 2010 Andras Becsi (abecsi@inf.u-szeged.hu), University of Szeged
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# Module to share code to detect the existance of features in built binaries.
30
31use strict;
32use warnings;
33
34BEGIN {
35   use Exporter   ();
36   our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
37   $VERSION     = 1.00;
38   @ISA         = qw(Exporter);
39   @EXPORT      = qw(&checkWebCoreFeatureSupport
40                     &removeLibraryDependingOnFeature);
41   %EXPORT_TAGS = ( );
42   @EXPORT_OK   = ();
43}
44
45sub libraryContainsSymbol($$)
46{
47    my ($path, $symbol) = @_;
48
49    if (isCygwin() or isWindows()) {
50        # FIXME: Implement this for Windows.
51        return 0;
52    }
53
54    my $foundSymbol = 0;
55    if (-e $path) {
56        open NM, "-|", "nm", $path or die;
57        while (<NM>) {
58            $foundSymbol = 1 if /$symbol/; # FIXME: This should probably check for word boundaries before/after the symbol name.
59        }
60        close NM;
61    }
62    return $foundSymbol;
63}
64
65sub hasFeature($$)
66{
67    my ($featureName, $path) = @_;
68    my %symbolForFeature = (
69        "MathML" => "MathMLElement",
70        "SVG" => "SVGDefsElement", # We used to look for SVGElement but isSVGElement exists (and would match) in --no-svg builds.
71        "Accelerated Compositing" => "GraphicsLayer",
72        "3D Rendering" => "WebCoreHas3DRendering",
73        "3D Canvas" => "WebGLShader",
74        "WML" => "WMLElement",
75        "WCSS" => "parseWCSSInputProperty",
76        "XHTMLMP" => "isXHTMLMPDocument",
77    );
78    my $symbolName = $symbolForFeature{$featureName};
79    die "Unknown feature: $featureName" unless $symbolName;
80    return libraryContainsSymbol($path, $symbolName);
81}
82
83sub checkWebCoreFeatureSupport($$)
84{
85    my ($feature, $required) = @_;
86    my $libraryName = "WebCore";
87    my $path = builtDylibPathForName($libraryName);
88    my $hasFeature = hasFeature($feature, $path);
89    if ($required && !$hasFeature) {
90        die "$libraryName at \"$path\" does not include $hasFeature support.  See build-webkit --help\n";
91    }
92    return $hasFeature;
93}
94
95sub removeLibraryDependingOnFeature($$$)
96{
97    my ($libraryName, $featureName, $shouldHaveFeature) = @_;
98    my $path = builtDylibPathForName($libraryName);
99    return unless -x $path;
100
101    my $hasFeature = hasFeature($featureName, $path);
102    system "rm -f $path" if ($shouldHaveFeature xor $hasFeature);
103}
104
1051;
106