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#!/usr/bin/env perl
#
# Generate code for an XDR protocol, optionally applying
# fixups to the glibc rpcgen code so that it compiles
# with warnings turned on.
#
# This code is evil. Arguably better would be just to compile
# without -Werror. Update: The IXDR_PUT_LONG replacements are
# actually fixes for 64 bit, so this file is necessary. Arguably
# so is the type-punning fix.
#
# Copyright (C) 2007, 2011-2013 Red Hat, Inc.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see
# <http://www.gnu.org/licenses/>.
#
# Richard Jones <rjones@redhat.com>
use strict;
my $in_function = 0;
my @function = ();
my $rpcgen = shift;
my $mode = shift;
my $xdrdef = shift;
my $target = shift;
unlink $target;
if ($rpcgen =~ /portable-rpcgen/) {
$rpcgen = "$rpcgen -o -";
}
open RPCGEN, "-|", "$rpcgen $mode $xdrdef"
or die "cannot run $rpcgen $mode $xdrdef: $!";
open TARGET, ">$target"
or die "cannot create $target: $!";
my $fixup = $^O eq "linux" || $^O eq "gnukfreebsd" || $^O eq "freebsd" || $^O eq "darwin";
if ($mode eq "-c") {
print TARGET "#include <config.h>\n";
}
while (<RPCGEN>) {
# We only want to fixup the GLibc rpcgen output
# So just print data unchanged, if non-Linux
unless ($fixup) {
print TARGET;
next;
}
if (m/^{/) {
$in_function = 1;
print TARGET;
next;
}
s/\t/ /g;
# Fix VPATH builds
s,#include ".*/([^/]+)protocol\.h",#include "${1}protocol.h",;
# Portability for Solaris RPC
s/u_quad_t/uint64_t/g;
s/quad_t/int64_t/g;
s/xdr_u_quad_t/xdr_uint64_t/g;
s/xdr_quad_t/xdr_int64_t/g;
s/(?<!IXDR_GET_INT32 )IXDR_GET_LONG/IXDR_GET_INT32/g;
if (m/^}/) {
$in_function = 0;
# Note: The body of the function is in @function.
# Remove decl of buf, if buf isn't used in the function.
my @uses = grep /[^.>]\bbuf\b/, @function;
@function = grep !/[^.>]\bbuf\b/, @function if @uses == 1;
# Remove decl of i, if i isn't used in the function.
@uses = grep /[^.>]\bi\b/, @function;
@function = grep !/[^.>]\bi\b/, @function if @uses == 1;
# (char **)&objp->... gives:
# warning: dereferencing type-punned pointer will break
# strict-aliasing rules
# so rewrite it.
my %uses = ();
my $i = 0;
foreach (@function) {
$uses{$1} = $i++ if m/\(char \*\*\)\&(objp->[a-z_.]+_val)/i;
}
if (keys %uses >= 1) {
my $i = 1;
foreach (sort(keys %uses)) {
$i = $uses{$_};
unshift @function,
(" char **objp_cpp$i = (char **) (void *) &$_;\n");
$i++;
}
@function =
map { s{\(char \*\*\)\&(objp->[a-z_.]+_val)}
{objp_cpp$uses{$1}}gi; $_ } @function;
}
# The code uses 'IXDR_PUT_{U_,}LONG' but it's wrong in two
# ways: Firstly these functions are deprecated and don't
# work on 64 bit platforms. Secondly the return value should
# be ignored. Correct both these mistakes.
@function =
map { s/\bIXDR_PUT_((U_)?)LONG\b/(void)IXDR_PUT_$1INT32/; $_ }
map { s/\bXDR_INLINE\b/(int32_t*)XDR_INLINE/; $_ }
@function;
print TARGET (join ("", @function));
@function = ();
}
unless ($in_function) {
print TARGET;
} else {
push @function, $_;
}
}
close TARGET
or die "cannot save $target: $!";
close RPCGEN
or die "cannot shutdown $rpcgen: $!";
chmod 0444, $target
or die "cannot set $target readonly: $!";
|
