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|
#!/usr/bin/perl
#
# Generate lwlocknames.h from lwlocklist.h
# Copyright (c) 2000-2024, PostgreSQL Global Development Group
use strict;
use warnings FATAL => 'all';
use Getopt::Long;
my $output_path = '.';
my $lastlockidx = -1;
my $continue = "\n";
GetOptions('outdir:s' => \$output_path);
open my $lwlocklist, '<', $ARGV[0] or die;
open my $wait_event_names, '<', $ARGV[1] or die;
# Include PID in suffix in case parallel make runs this multiple times.
my $htmp = "$output_path/lwlocknames.h.tmp$$";
open my $h, '>', $htmp or die "Could not open $htmp: $!";
my $autogen =
"/* autogenerated from src/include/storage/lwlocklist.h, do not edit */\n";
print $h $autogen;
print $h "/* there is deliberately not an #ifndef LWLOCKNAMES_H here */\n\n";
#
# First, record the predefined LWLocks listed in wait_event_names.txt. We'll
# cross-check those with the ones in lwlocklist.h.
#
my @wait_event_lwlocks;
my $record_lwlocks = 0;
while (<$wait_event_names>)
{
chomp;
# Check for end marker.
last if /^# END OF PREDEFINED LWLOCKS/;
# Skip comments and empty lines.
next if /^#/;
next if /^\s*$/;
# Start recording LWLocks when we find the WaitEventLWLock section.
if (/^Section: ClassName - WaitEventLWLock$/)
{
$record_lwlocks = 1;
next;
}
# Go to the next line if we are not yet recording LWLocks.
next if not $record_lwlocks;
# Record the LWLock.
(my $waiteventname, my $waitevendocsentence) = split(/\t/, $_);
push(@wait_event_lwlocks, $waiteventname);
}
my $in_comment = 0;
my $i = 0;
while (<$lwlocklist>)
{
chomp;
# Skip single-line C comments and empty lines
next if m{^\s*/\*.*\*/$};
next if /^\s*$/;
# skip multiline C comments
if ($in_comment == 1)
{
$in_comment = 0 if m{\*/};
next;
}
elsif (m{^\s*/\*})
{
$in_comment = 1;
next;
}
die "unable to parse lwlocklist.h line \"$_\""
unless /^PG_LWLOCK\((\d+),\s+(\w+)\)$/;
(my $lockidx, my $lockname) = ($1, $2);
die "lwlocklist.h not in order" if $lockidx < $lastlockidx;
die "lwlocklist.h has duplicates" if $lockidx == $lastlockidx;
die "$lockname defined in lwlocklist.h but missing from "
. "wait_event_names.txt"
if $i >= scalar @wait_event_lwlocks;
die "lists of predefined LWLocks do not match (first mismatch at "
. "$wait_event_lwlocks[$i] in wait_event_names.txt and $lockname in "
. "lwlocklist.h)"
if $wait_event_lwlocks[$i] ne $lockname;
$i++;
while ($lastlockidx < $lockidx - 1)
{
++$lastlockidx;
$continue = ",\n";
}
$lastlockidx = $lockidx;
$continue = ",\n";
print $h "#define ${lockname}Lock (&MainLWLockArray[$lockidx].lock)\n";
}
die
"$wait_event_lwlocks[$i] defined in wait_event_names.txt but missing from "
. "lwlocklist.h"
if $i < scalar @wait_event_lwlocks;
print $h "\n";
printf $h "#define NUM_INDIVIDUAL_LWLOCKS %s\n", $lastlockidx + 1;
close $h;
rename($htmp, "$output_path/lwlocknames.h")
|| die "rename: $htmp to $output_path/lwlocknames.h: $!";
close $lwlocklist;
|
