check-for-weak-vtables

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#!/usr/bin/perl

# Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1.  Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer. 
# 2.  Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in the
#     documentation and/or other materials provided with the distribution. 
# 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
#     its contributors may be used to endorse or promote products derived
#     from this software without specific prior written permission. 
#
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# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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# "check-for-weak-vtables" script for WebKit Open Source Project

# Intended to be invoked from an Xcode build step to check if there are
# any weak vtables in a target.

use warnings;
use strict;

use File::Basename;

sub touch($);

my $arch = $ENV{'CURRENT_ARCH'};
my $configuration = $ENV{'CONFIGURATION'};
my $target = $ENV{'TARGET_NAME'};
my $variant = $ENV{'CURRENT_VARIANT'};
my $coverageBuild = $ENV{'WEBKIT_COVERAGE_BUILD'};
my $debugRoot = $ENV{'WEBKIT_DEBUG_ROOT'};

$arch = $ENV{'NATIVE_ARCH'} if !$arch; # for Xcode 2.1, which does not have CURRENT_ARCH
$variant = "normal" if !$variant; # for Xcode 2.1, which does not have CURRENT_VARIANT

my $executablePath = "$ENV{'TARGET_BUILD_DIR'}/$ENV{'EXECUTABLE_PATH'}";

my $buildTimestampPath = $ENV{'TARGET_TEMP_DIR'} . "/" . basename($0) . ".timestamp";
my $buildTimestampAge = -M $buildTimestampPath;
my $executablePathAge = -M $executablePath;

my $sawError = 0;

if (!defined $executablePathAge || !defined $buildTimestampAge || $executablePathAge > $buildTimestampAge) {
    if (!open NM, "(nm -m '$executablePath' | c++filt | sed 's/^/STDOUT:/') 2>&1 |") {
        print "Could not open $executablePath\n";
        $sawError = 1;
        next;
    }
    my @weakVTableClasses = ();
    while (<NM>) {
        if (/^STDOUT:/) {
            push @weakVTableClasses, $1 if /weak external vtable for (.*)$/;
        } else {
            print STDERR if $_ ne "nm: no name list\n";
        }
    }
    close NM;
    if (@weakVTableClasses) {
        my $shortName = $executablePath;
        $shortName =~ s/.*\///;

        print "$shortName has a weak vtable in it ($executablePath)\n";
        print "Fix by making sure the first virtual function in each of these classes is not an inline:\n";
        for my $class (sort @weakVTableClasses) {
            print "    $class\n";
        }
        $sawError = 1;
    }
}

if ($sawError and !$coverageBuild) {
    unlink $executablePath;
    exit 1;
}

touch($buildTimestampPath);

exit 0;

sub touch($)
{
    my ($path) = @_;
    open(TOUCH, ">", $path) or die "$!";
    close(TOUCH);
}