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      1 # Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved
      2 # Copyright (C) 2006 Alexey Proskuryakov (ap (at] nypop.com)
      3 # Copyright (C) 2010 Andras Becsi (abecsi (at] 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 
     31 use strict;
     32 use warnings;
     33 
     34 BEGIN {
     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 
     45 sub libraryContainsSymbol($$)
     46 {
     47     my ($path, $symbol) = @_;
     48 
     49     if (isCygwin() or isWindows()) {
     50         # FIXME: Implement this for Windows.
     51         return 0;
     52     }
     53 
     54     my $foundSymbol = 0;
     55     if (-e $path) {
     56         open NM, "-|", "nm", $path or die;
     57         while (<NM>) {
     58             $foundSymbol = 1 if /$symbol/; # FIXME: This should probably check for word boundaries before/after the symbol name.
     59         }
     60         close NM;
     61     }
     62     return $foundSymbol;
     63 }
     64 
     65 sub hasFeature($$)
     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 
     83 sub checkWebCoreFeatureSupport($$)
     84 {
     85     my ($feature, $required) = @_;
     86     my $libraryName = "WebCore";
     87     my $path = builtDylibPathForName($libraryName);
     88     my $hasFeature = hasFeature($feature, $path);
     89     if ($required && !$hasFeature) {
     90         die "$libraryName at \"$path\" does not include $hasFeature support.  See build-webkit --help\n";
     91     }
     92     return $hasFeature;
     93 }
     94 
     95 sub removeLibraryDependingOnFeature($$$)
     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 
    105 1;
    106