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#!/usr/bin/perl
#
# Generate lwlocknames.h and lwlocknames.c from lwlocknames.txt
# Copyright (c) 2000-2021, PostgreSQL Global Development Group
use strict;
use warnings;
my $lastlockidx = -1;
my $continue = "\n";
open my $lwlocknames, '<', $ARGV[0] or die;
# Include PID in suffix in case parallel make runs this multiple times.
my $htmp = "lwlocknames.h.tmp$$";
my $ctmp = "lwlocknames.c.tmp$$";
open my $h, '>', $htmp or die "Could not open $htmp: $!";
open my $c, '>', $ctmp or die "Could not open $ctmp: $!";
my $autogen =
"/* autogenerated from src/backend/storage/lmgr/lwlocknames.txt, do not edit */\n";
print $h $autogen;
print $h "/* there is deliberately not an #ifndef LWLOCKNAMES_H here */\n\n";
print $c $autogen, "\n";
print $c "const char *const IndividualLWLockNames[] = {";
while (<$lwlocknames>)
{
chomp;
# Skip comments
next if /^#/;
next if /^\s*$/;
die "unable to parse lwlocknames.txt"
unless /^(\w+)\s+(\d+)$/;
(my $lockname, my $lockidx) = ($1, $2);
my $trimmedlockname = $lockname;
$trimmedlockname =~ s/Lock$//;
die "lock names must end with 'Lock'" if $trimmedlockname eq $lockname;
die "lwlocknames.txt not in order" if $lockidx < $lastlockidx;
die "lwlocknames.txt has duplicates" if $lockidx == $lastlockidx;
while ($lastlockidx < $lockidx - 1)
{
++$lastlockidx;
printf $c "%s \"<unassigned:%d>\"", $continue, $lastlockidx;
$continue = ",\n";
}
printf $c "%s \"%s\"", $continue, $trimmedlockname;
$lastlockidx = $lockidx;
$continue = ",\n";
print $h "#define $lockname (&MainLWLockArray[$lockidx].lock)\n";
}
printf $c "\n};\n";
print $h "\n";
printf $h "#define NUM_INDIVIDUAL_LWLOCKS %s\n", $lastlockidx + 1;
close $h;
close $c;
rename($htmp, 'lwlocknames.h') || die "rename: $htmp: $!";
rename($ctmp, 'lwlocknames.c') || die "rename: $ctmp: $!";
close $lwlocknames;
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