#!./perl -w
BEGIN {
- $| = 1;
chdir 't' if -d 't';
@INC = '../lib';
+ require './test.pl';
}
-print "1..20\n";
+use strict;
-my $t = 1;
tie my $c => 'Tie::Monitor';
-sub ok {
- my($ok, $got, $exp, $rexp, $wexp) = @_;
- my($rgot, $wgot) = (tied $c)->init(0);
- print $ok ? "ok $t\n" : "# expected $exp, got $got\nnot ok $t\n";
- ++$t;
- if ($rexp == $rgot && $wexp == $wgot) {
- print "ok $t\n";
- } else {
- print "# read $rgot expecting $rexp\n" if $rgot != $rexp;
- print "# wrote $wgot expecting $wexp\n" if $wgot != $wexp;
- print "not ok $t\n";
- }
- ++$t;
+sub expected_tie_calls {
+ my ($obj, $rexp, $wexp, $tn) = @_;
+ local $::Level = $::Level + 1;
+ my ($rgot, $wgot) = $obj->init();
+ is ($rgot, $rexp, $tn ? "number of fetches when $tn" : ());
+ is ($wgot, $wexp, $tn ? "number of stores when $tn" : ());
}
-sub ok_undef { ok(!defined($_[0]), shift, "undef", @_) }
-sub ok_numeric { ok($_[0] == $_[1], @_) }
-sub ok_string { ok($_[0] eq $_[1], @_) }
-
+# Use ok() instead of is(), cmp_ok() etc, to strictly control number of accesses
my($r, $s);
-# the thing itself
-ok_numeric($r = $c + 0, 0, 1, 0);
-ok_string($r = "$c", '0', 1, 0);
+ok($r = $c + 0 == 0, 'the thing itself');
+expected_tie_calls(tied $c, 1, 0);
+ok($r = "$c" eq '0', 'the thing itself');
+expected_tie_calls(tied $c, 1, 0);
-# concat
-ok_string($c . 'x', '0x', 1, 0);
-ok_string('x' . $c, 'x0', 1, 0);
+ok($c . 'x' eq '0x', 'concat');
+expected_tie_calls(tied $c, 1, 0);
+ok('x' . $c eq 'x0', 'concat');
+expected_tie_calls(tied $c, 1, 0);
$s = $c . $c;
-ok_string($s, '00', 2, 0);
+ok($s eq '00', 'concat');
+expected_tie_calls(tied $c, 2, 0);
$r = 'x';
$s = $c = $r . 'y';
-ok_string($s, 'xy', 1, 1);
+ok($s eq 'xy', 'concat');
+expected_tie_calls(tied $c, 1, 1);
$s = $c = $c . 'x';
-ok_string($s, '0x', 2, 1);
+ok($s eq '0x', 'concat');
+expected_tie_calls(tied $c, 2, 1);
$s = $c = 'x' . $c;
-ok_string($s, 'x0', 2, 1);
+ok($s eq 'x0', 'concat');
+expected_tie_calls(tied $c, 2, 1);
$s = $c = $c . $c;
-ok_string($s, '00', 3, 1);
+ok($s eq '00', 'concat');
+expected_tie_calls(tied $c, 3, 1);
-# multiple magic in core functions
$s = chop($c);
-ok_string($s, '0', 1, 1);
+ok($s eq '0', 'multiple magic in core functions');
+expected_tie_calls(tied $c, 1, 1);
+
+$c = *strat;
+$s = $c;
+ok($s eq *strat,
+ 'Assignment should not ignore magic when the last thing assigned was a glob');
+expected_tie_calls(tied $c, 1, 1);
+
+package o { use overload '""' => sub { "foo\n" } }
+$c = bless [], o::;
+chomp $c;
+expected_tie_calls(tied $c, 1, 2, 'chomping a ref');
+
+{
+ my $outfile = tempfile();
+ open my $h, ">$outfile" or die "$0 cannot close $outfile: $!";
+ print $h "bar\n";
+ close $h or die "$0 cannot close $outfile: $!";
+
+ $c = *foo; # 1 write
+ open $h, $outfile;
+ sysread $h, $c, 3, 7; # 1 read; 1 write
+ is $c, "*main::bar", 'what sysread wrote'; # 1 read
+ expected_tie_calls(tied $c, 2, 2, 'calling sysread with tied buf');
+ close $h or die "$0 cannot close $outfile: $!";
+
+ # Do this again, with a utf8 handle
+ $c = *foo; # 1 write
+ open $h, "<:utf8", $outfile;
+ sysread $h, $c, 3, 7; # 1 read; 1 write
+ is $c, "*main::bar", 'what sysread wrote'; # 1 read
+ expected_tie_calls(tied $c, 2, 2, 'calling sysread with tied buf');
+ close $h or die "$0 cannot close $outfile: $!";
+
+ unlink_all $outfile;
+}
+
+# autovivication of aelem, helem, of rv2sv combined with get-magic
+{
+ my $true = 1;
+ my $s;
+ tie $$s, "Tie::Monitor";
+ $$s = undef;
+ $$s->[0] = 73;
+ is($$s->[0], 73);
+ expected_tie_calls(tied $$s, 3, 2);
+
+ my @a;
+ tie $a[0], "Tie::Monitor";
+ $a[0] = undef;
+ $a[0][0] = 73;
+ is($a[0][0], 73);
+ expected_tie_calls(tied $a[0], 3, 2);
+
+ my %h;
+ tie $h{foo}, "Tie::Monitor";
+ $h{foo} = undef;
+ $h{foo}{bar} = 73;
+ is($h{foo}{bar}, 73);
+ expected_tie_calls(tied $h{foo}, 3, 2);
+
+ # Similar tests, but with obscured autovivication by using dummy list or "?:" operator
+ $$s = undef;
+ ${ (), $$s }[0] = 73;
+ is( $$s->[0], 73);
+ expected_tie_calls(tied $$s, 3, 2);
+
+ $$s = undef;
+ ( ! $true ? undef : $$s )->[0] = 73;
+ is( $$s->[0], 73);
+ expected_tie_calls(tied $$s, 3, 2);
+
+ $$s = undef;
+ ( $true ? $$s : undef )->[0] = 73;
+ is( $$s->[0], 73);
+ expected_tie_calls(tied $$s, 3, 2);
+}
+
+# A plain *foo should not call get-magic on *foo.
+# This method of scalar-tying an immutable glob relies on details of the
+# current implementation that are subject to change. This test may need to
+# be rewritten if they do change.
+my $tyre = tie $::{gelp} => 'Tie::Monitor';
+# Compilation of this eval autovivifies the *gelp glob.
+eval '$tyre->init(0); () = \*gelp';
+my($rgot, $wgot) = $tyre->init(0);
+ok($rgot == 0, 'a plain *foo causes no get-magic');
+ok($wgot == 0, 'a plain *foo causes no set-magic');
+
+# get-magic when exiting a non-lvalue sub in potentially autovivify-
+# ing context
+{
+ no strict;
+
+ my $tied_to = tie $_{elem}, "Tie::Monitor";
+ () = sub { delete $_{elem} }->()->[3];
+ expected_tie_calls $tied_to, 1, 0,
+ 'mortal magic var is implicitly returned in autoviv context';
+
+ $tied_to = tie $_{elem}, "Tie::Monitor";
+ () = sub { return delete $_{elem} }->()->[3];
+ expected_tie_calls $tied_to, 1, 0,
+ 'mortal magic var is explicitly returned in autoviv context';
+
+ $tied_to = tie $_{elem}, "Tie::Monitor";
+ my $rsub;
+ $rsub = sub { if ($_[0]) { delete $_{elem} } else { &$rsub(1)->[3] } };
+ &$rsub;
+ expected_tie_calls $tied_to, 1, 0,
+ 'mortal magic var is implicitly returned in recursive autoviv context';
+
+ $tied_to = tie $_{elem}, "Tie::Monitor";
+ $rsub = sub {
+ if ($_[0]) { return delete $_{elem} } else { &$rsub(1)->[3] }
+ };
+ &$rsub;
+ expected_tie_calls $tied_to, 1, 0,
+ 'mortal magic var is explicitly returned in recursive autoviv context';
+
+ $tied_to = tie $_{elem}, "Tie::Monitor";
+ my $x = \sub { delete $_{elem} }->();
+ expected_tie_calls $tied_to, 1, 0,
+ 'mortal magic var is implicitly returned to refgen';
+ is tied $$x, undef,
+ 'mortal magic var is copied when implicitly returned';
+
+ $tied_to = tie $_{elem}, "Tie::Monitor";
+ $x = \sub { return delete $_{elem} }->();
+ expected_tie_calls $tied_to, 1, 0,
+ 'mortal magic var is explicitly returned to refgen';
+ is tied $$x, undef,
+ 'mortal magic var is copied when explicitly returned';
+}
+
+done_testing();
# adapted from Tie::Counter by Abigail
package Tie::Monitor;
https://perl5.git.perl.org / perl5.git / blobdiff