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#!/usr/bin/env perl
#
# %CopyrightBegin%
#
# Copyright Ericsson AB 1999-2016. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# %CopyrightEnd%
#
use strict;
use File::Basename;
#
# Description:
# Packages one erlang module in a form that can be preloaded (C source
# for Unix or resource script for Windows). The output is written to
# standard output.
#
# Usage:
# make_preload [ Options ] file.{jam,beam}
#
# Options:
# -rc Produce a resource script rather than C source.
#
# Author:
# Bjorn Gustavsson
#
my $gen_rc = 0;
my $gen_old = 0;
my $windres = 0;
my $msys = 0;
my $file;
my $progname = basename($0);
while (@ARGV && $ARGV[0] =~ /^-(\w+)/) {
my $opt = shift;
if ($opt eq '-rc') {
$gen_rc = 1;
} elsif ($opt eq '-windres') {
$windres = 1;
} elsif ($opt eq '-msys') {
$msys = 1;
} elsif ($opt eq '-old') {
$gen_old = 1;
} else {
usage("bad option: $opt");
}
}
print header();
my @modules;
my $num = 1;
foreach $file (@ARGV) {
local($/);
usage("not a beam file")
unless $file =~ /\.beam$/;
my $module = basename($file, ".beam");
if ($gen_rc) {
my $win_file;
if ($msys) {
($win_file) = split("\n", `(msys2win_path.sh $file)`);
} else {
($win_file) = split("\n", `(cygpath -d $file 2>/dev/null || cygpath -w $file)`);
}
$win_file =~ s&\\&\\\\&g;
print "$num ERLANG_CODE \"$win_file\"\n";
push(@modules, " ", -s $file, "L, $num, ",
length($module), ",\"$module\",\n");
$num++;
} else {
my $i;
my $comment = '';
open(FILE, $file) or error("failed to read $file: $!");
binmode(FILE);
$_ = <FILE>;
$_ = beam_strip($_);
close(FILE);
push(@modules, " {\"$module\", " . length($_) . ", preloaded_$module},\n");
print "unsigned preloaded_size_$module = ", length($_), ";\n";
print "unsigned char preloaded_$module", "[] = {\n";
for ($i = 0; $i < length($_); $i++) {
if ($i % 8 == 0 && $comment ne '') {
$comment =~ s@/\*@..@g; # Comment start -- avoid warning.
$comment =~ s@\*/@..@g; # Comment terminator.
print " /* $comment */\n ";
$comment = '';
}
my $c = ord(substr($_, $i, 1));
printf("0x%02x,", $c);
$comment .= (32 <= $c && $c < 127) ? chr($c) : '.';
}
$comment =~ s@\*/@..@g; # Comment terminator.
print " " x (8-($i % 8)), " /* $comment */\n};\n";
}
}
if ($windres) {
$modules[$#modules] =~ s/,$//;
}
if ($gen_rc) {
print "#include <beam.rc>\n";
$num--;
print "\n0 ERLANG_DICT\n";
print "BEGIN\n";
print " $num,\n";
print @modules;
print "END\n";
} elsif ($gen_old) {
print "struct {\n";
print " char* name;\n";
print " int size;\n";
print " unsigned char* code;\n";
print "} pre_loaded[] = {\n";
foreach (@modules) {
print;
}
print " {0, 0, 0}\n";
print "};\n";
}
sub usage {
warn "$progname: ", @_, "\n";
die "usage: $progname -o output-directory file.{jam,beam}\n";
}
sub error {
die "$progname: ", @_, "\n";
}
sub beam_strip {
my($beam) = @_;
my $size_left = length($beam);
my %chunk;
my %needed_chunk = ('Code' => 1,
'Atom' => 1,
'ImpT' => 1,
'ExpT' => 1,
'StrT' => 1,
'FunT' => 1,
'LitT' => 1);
die "can't read Beam files for OTP R4 or earlier (sorry)"
if $beam =~ /^\x7fBEAM!/;
#
# Read and verify the head of the IFF file.
#
my ($id, $size, $beam_id) = unpack("a4Na4", $beam);
return $beam # It might be compressed.
unless $id eq 'FOR1';
# die "not a BEAM file: no IFF 'FOR1' chunk"
# unless $id eq 'FOR1';
$size_left -= 8;
die "form size $size greater than size ", $size_left, " of module"
if $size > $size_left;
$size_left -= 4;
die "not a BEAM file: IFF form type is not 'BEAM'"
unless $beam_id eq 'BEAM';
#
# Read all IFF chunks.
#
$beam = substr($beam, 12, $size_left);
while ($size_left > 0) {
($id, $size) = unpack("a4N", $beam);
$size_left -= 8;
die "chunk size $size greater than size ", $size_left, " of module"
if $size > $size_left;
$size = 4*int(($size+3)/4);
$chunk{$id} = substr($beam, 0, 8+$size);
$beam = substr($beam, 8+$size);
$size_left = length($beam);
}
#
# Create a new beam file with only the useful chunk types.
#
my @chunks;
foreach (sort keys %chunk) {
push(@chunks, $chunk{$_})
if $needed_chunk{$_};
}
$beam = join('', @chunks);
join('', "FOR1", pack("N", length($beam)+4), "BEAM", $beam);
}
sub header {
my $time = localtime;
<<END;
/*
* DO NOT EDIT THIS FILE. It was automatically generated
* by the `$progname' program on $time.
*/
END
}
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