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#!/usr/bin/perl
#----------------------------------------------------------------------
#
# unused_oids
# Finds blocks of manually-assignable OIDs that have not already been
# claimed by previous hackers. The main use is for finding available
# OIDs for new internal functions. The numbers printed are inclusive
# ranges of unused OIDs.
#
# Before using a large empty block, make sure you aren't about
# to take over what was intended as expansion space for something
# else.
#
# Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
# Portions Copyright (c) 1994, Regents of the University of California
#
# src/include/catalog/unused_oids
#
#----------------------------------------------------------------------
use strict;
use warnings;
# Must run in src/include/catalog
use FindBin;
chdir $FindBin::RealBin or die "could not cd to $FindBin::RealBin: $!\n";
use lib "$FindBin::RealBin/../../backend/catalog/";
use Catalog;
my @input_files = (glob("pg_*.h"), qw(indexing.h toasting.h));
my $oids = Catalog::FindAllOidsFromHeaders(@input_files);
# Also push FirstGenbkiObjectId to serve as a terminator for the last gap.
my $FirstGenbkiObjectId =
Catalog::FindDefinedSymbol('access/transam.h', '..', 'FirstGenbkiObjectId');
push @{$oids}, $FirstGenbkiObjectId;
my $prev_oid = 0;
my @sortedoids = sort { $a <=> $b } @{$oids};
foreach my $oid (@sortedoids)
{
if ($oid > $prev_oid + 1)
{
if ($oid > $prev_oid + 2)
{
printf "%d - %d\n", $prev_oid + 1, $oid - 1;
}
else
{
printf "%d\n", $prev_oid + 1;
}
}
$prev_oid = $oid;
}
my $suggestion;
do
{
$suggestion = int(8000 + rand(2000));
} while (grep(/^$suggestion$/, @{$oids}));
my $navailable = 0;
foreach my $oid (@sortedoids)
{
if ($oid > $suggestion)
{
$navailable = $oid - $suggestion;
last;
}
}
printf "Patches should use a more-or-less consecutive range of OIDs.\n";
printf
"Best practice is to start with a random choice in the range 8000-9999.\n";
printf
"Suggested random unused OID: $suggestion ($navailable consecutive OID(s) available starting here)\n";