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#!/usr/bin/perl
# Copyright (C) 2006, 2007, 2008, 2010 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 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.
#
# THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# "check-for-weak-vtables-and-externals" script for WebKit Open Source Project
# Intended to be invoked from an Xcode build step to check if there are
# any weak vtables or weak externals 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 "ERROR: Could not open $executablePath\n";
$sawError = 1;
next;
}
my @weakVTableClasses = ();
my @weakExternalSymbols = ();
while (<NM>) {
if (/^STDOUT:/) {
# Ignore undefined, RTTI and typeinfo symbols.
next if /\bundefined\b/ or /\b__ZT[IS]/;
if (/weak external vtable for (.*)$/) {
push @weakVTableClasses, $1;
} elsif (/weak external (.*)$/) {
push @weakExternalSymbols, $1;
}
} else {
print STDERR if $_ ne "nm: no name list\n";
}
}
close NM;
my $shortName = $executablePath;
$shortName =~ s/.*\///;
if (@weakVTableClasses) {
print "ERROR: $shortName has a weak vtable in it ($executablePath)\n";
print "ERROR: Fix by making sure the first virtual function in each of these classes is not an inline:\n";
for my $class (sort @weakVTableClasses) {
print "ERROR: class $class\n";
}
$sawError = 1;
}
if (@weakExternalSymbols) {
print "ERROR: $shortName has a weak external symbol in it ($executablePath)\n";
print "ERROR: A weak external symbol is generated when a symbol is defined in multiple compilation units and is also marked as being exported from the library.\n";
print "ERROR: A common cause of weak external symbols is when an inline function is listed in the linker export file.\n";
for my $symbol (sort @weakExternalSymbols) {
print "ERROR: symbol $symbol\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);
}
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