[perl5.git] / t / op / svleak.t

#!./perl

# A place to put some simple leak tests. Uses XS::APItest to make
# PL_sv_count available, allowing us to run a bit of code multiple times and
# see if the count increases.

BEGIN {
    chdir 't';
    @INC = '../lib';
    require './test.pl';

    eval { require XS::APItest; XS::APItest->import('sv_count'); 1 }
	or skip_all("XS::APItest not available");
}

use Config;

plan tests => 68;

# run some code N times. If the number of SVs at the end of loop N is
# greater than (N-1)*delta at the end of loop 1, we've got a leak
#
sub leak {
    my ($n, $delta, $code, @rest) = @_;
    my $sv0 = 0;
    my $sv1 = 0;
    for my $i (1..$n) {
	&$code();
	$sv1 = sv_count();
	$sv0 = $sv1 if $i == 1;
    }
    cmp_ok($sv1-$sv0, '<=', ($n-1)*$delta, @rest);
}

# Like leak, but run a string eval instead.
# The code is used instead of the test name
# if the name is absent.
sub eleak {
    my ($n,$delta,$code,@rest) = @_;
    leak $n, $delta, sub { eval $code },
         @rest ? @rest : $code
}

# run some expression N times. The expr is concatenated N times and then
# evaled, ensuring that that there are no scope exits between executions.
# If the number of SVs at the end of expr N is greater than (N-1)*delta at
# the end of expr 1, we've got a leak
#
sub leak_expr {
    my ($n, $delta, $expr, @rest) = @_;
    my $sv0 = 0;
    my $sv1 = 0;
    my $true = 1; # avoid stuff being optimised away
    my $code1 = "($expr || \$true)";
    my $code = "$code1 && (\$sv0 = sv_count())" . ("&& $code1" x 4)
		. " && (\$sv1 = sv_count())";
    if (eval $code) {
	cmp_ok($sv1-$sv0, '<=', ($n-1)*$delta, @rest);
    }
    else {
	fail("eval @rest: $@");
    }
}


my @a;

leak(5, 0, sub {},                 "basic check 1 of leak test infrastructure");
leak(5, 0, sub {push @a,1;pop @a}, "basic check 2 of leak test infrastructure");
leak(5, 1, sub {push @a,1;},       "basic check 3 of leak test infrastructure");

eleak(2, 0, 'sub{<*>}');

eleak(2, 0, 'goto sub {}', 'goto &sub in eval');
eleak(2, 0, '() = sort { goto sub {} } 1,2', 'goto &sub in sort');
eleak(2, 0, '/(?{ goto sub {} })/', 'goto &sub in regexp');

sub TIEARRAY	{ bless [], $_[0] }
sub FETCH	{ $_[0]->[$_[1]] }
sub STORE	{ $_[0]->[$_[1]] = $_[2] }

# local $tied_elem[..] leaks <20020502143736.N16831@dansat.data-plan.com>"
{
    tie my @a, 'main';
    leak(5, 0, sub {local $a[0]}, "local \$tied[0]");
}

# [perl #74484]  repeated tries leaked SVs on the tmps stack

leak_expr(5, 0, q{"YYYYYa" =~ /.+?(a(.+?)|b)/ }, "trie leak");

# [perl #48004] map/grep didn't free tmps till the end

{
    # qr/1/ just creates tmps that are hopefully freed per iteration

    my $s;
    my @a;
    my @count = (0) x 4; # pre-allocate

    grep qr/1/ && ($count[$_] = sv_count()) && 99,  0..3;
    is(@count[3] - @count[0], 0, "void   grep expr:  no new tmps per iter");
    grep { qr/1/ && ($count[$_] = sv_count()) && 99 }  0..3;
    is(@count[3] - @count[0], 0, "void   grep block: no new tmps per iter");

    $s = grep qr/1/ && ($count[$_] = sv_count()) && 99,  0..3;
    is(@count[3] - @count[0], 0, "scalar grep expr:  no new tmps per iter");
    $s = grep { qr/1/ && ($count[$_] = sv_count()) && 99 }  0..3;
    is(@count[3] - @count[0], 0, "scalar grep block: no new tmps per iter");

    @a = grep qr/1/ && ($count[$_] = sv_count()) && 99,  0..3;
    is(@count[3] - @count[0], 0, "list   grep expr:  no new tmps per iter");
    @a = grep { qr/1/ && ($count[$_] = sv_count()) && 99 }  0..3;
    is(@count[3] - @count[0], 0, "list   grep block: no new tmps per iter");


    map qr/1/ && ($count[$_] = sv_count()) && 99,  0..3;
    is(@count[3] - @count[0], 0, "void   map expr:  no new tmps per iter");
    map { qr/1/ && ($count[$_] = sv_count()) && 99 }  0..3;
    is(@count[3] - @count[0], 0, "void   map block: no new tmps per iter");

    $s = map qr/1/ && ($count[$_] = sv_count()) && 99,  0..3;
    is(@count[3] - @count[0], 0, "scalar map expr:  no new tmps per iter");
    $s = map { qr/1/ && ($count[$_] = sv_count()) && 99 }  0..3;
    is(@count[3] - @count[0], 0, "scalar map block: no new tmps per iter");

    @a = map qr/1/ && ($count[$_] = sv_count()) && 99,  0..3;
    is(@count[3] - @count[0], 3, "list   map expr:  one new tmp per iter");
    @a = map { qr/1/ && ($count[$_] = sv_count()) && 99 }  0..3;
    is(@count[3] - @count[0], 3, "list   map block: one new tmp per iter");

}

SKIP:
{ # broken by 304474c3, fixed by cefd5c7c, but didn't seem to cause
  # any other test failures
  # base test case from ribasushi (Peter Rabbitson)
  eval { require Scalar::Util; Scalar::Util->import("weaken"); 1; }
    or skip "no weaken", 1;
  my $weak;
  {
    $weak = my $in = {};
    weaken($weak);
    my $out = { in => $in, in => undef }
  }
  ok(!$weak, "hash referenced weakened SV released");
}

# RT #72246: rcatline memory leak on bad $/

leak(2, 0,
    sub {
	my $f;
	open CATLINE, '<', \$f;
	local $/ = "\x{262E}";
	my $str = "\x{2622}";
	eval { $str .= <CATLINE> };
    },
    "rcatline leak"
);

{
    my $RE = qr/
      (?:
        <(?<tag>
          \s*
          [^>\s]+
        )>
      )??
    /xis;

    "<html><body></body></html>" =~ m/$RE/gcs;

    leak(5, 0, sub {
        my $tag = $+{tag};
    }, "named regexp captures");
}

eleak(2,0,'/[:]/');
eleak(2,0,'/[\xdf]/i');
eleak(2,0,'s![^/]!!');
eleak(2,0,'/[pp]/');
eleak(2,0,'/[[:ascii:]]/');
leak(2,0,sub { /(??{})/ }, '/(??{})/');

leak(2,0,sub { !$^V }, '[perl #109762] version object in boolean context');


# [perl #114356] run-time rexexp with unchanging pattern got
# inflated refcounts
eleak(2, 0, q{ my $x = "x"; "abc" =~ /$x/ for 1..5 }, '#114356');

eleak(2, 0, 'sub', '"sub" with nothing following');
eleak(2, 0, '+sub:a{}', 'anon subs with invalid attributes');
eleak(2, 0, 'no warnings; sub a{1 1}', 'sub with syntax error');
eleak(2, 0, 'no warnings; sub {1 1}', 'anon sub with syntax error');

# Syntax errors
eleak(2, 0, '"${<<END}"
                 ', 'unterminated here-doc in quotes in multiline eval');
eleak(2, 0, '"${<<END
               }"', 'unterminated here-doc in multiline quotes in eval');
leak(2, 0, sub { eval { do './op/svleak.pl' } },
        'unterminated here-doc in file');
eleak(2, 0, 'tr/9-0//');
eleak(2, 0, 'tr/a-z-0//');
eleak(2, 0, 'no warnings; nonexistent_function 33838',
        'bareword followed by number');
eleak(2, 0, '//dd;'x20, '"too many errors" when parsing m// flags');
eleak(2, 0, 's///dd;'x20, '"too many errors" when parsing s/// flags');
eleak(2, 0, 'no warnings; 2 2;BEGIN{}',
      'BEGIN block after syntax error');
{
    local %INC; # in case Errno is already loaded
    eleak(2, 0, 'no warnings; 2@!{',
                'implicit "use Errno" after syntax error');
}
eleak(2, 0, "\"\$\0\356\"", 'qq containing $ <null> something');
{
    local $::TODO = 'eval "END blah blah" still leaks';
    eleak(2, 0, 'END OF TERMS AND CONDITIONS', 'END followed by words');
}


# [perl #114764] Attributes leak scalars
leak(2, 0, sub { eval 'my $x : shared' }, 'my $x :shared used to leak');

eleak(2, 0, 'ref: 1', 'labels');

# Tied hash iteration was leaking if the hash was freed before itera-
# tion was over.
package t {
    sub TIEHASH { bless [] }
    sub FIRSTKEY { 0 }
}
leak(2, 0, sub {
    my $h = {};
    tie %$h, t;
    each %$h;
    undef $h;
}, 'tied hash iteration does not leak');

package explosive_scalar {
    sub TIESCALAR { my $self = shift; bless [undef, {@_}], $self  }
    sub FETCH     { die 'FETCH' if $_[0][1]{FETCH}; $_[0][0] }
    sub STORE     { die 'STORE' if $_[0][1]{STORE}; $_[0][0] = $_[1] }
}
tie my $die_on_fetch, 'explosive_scalar', FETCH => 1;

# List assignment was leaking when assigning explosive scalars to
# aggregates.
leak(2, 0, sub {
    eval {%a = ($die_on_fetch, 0)}; # key
    eval {%a = (0, $die_on_fetch)}; # value
    eval {%a = ($die_on_fetch, $die_on_fetch)}; # both
}, 'hash assignment does not leak');
leak(2, 0, sub {
    eval {@a = ($die_on_fetch)};
    eval {($die_on_fetch, $b) = ($b, $die_on_fetch)};
    # restore
    tie $die_on_fetch, 'explosive_scalar', FETCH => 1;
}, 'array assignment does not leak');

# [perl #107000]
package hhtie {
    sub TIEHASH { bless [] }
    sub STORE    { $_[0][0]{$_[1]} = $_[2] }
    sub FETCH    { die if $explosive; $_[0][0]{$_[1]} }
    sub FIRSTKEY { keys %{$_[0][0]}; each %{$_[0][0]} }
    sub NEXTKEY  { each %{$_[0][0]} }
}
leak(2, 0, sub {
    eval q`
    	BEGIN {
	    $hhtie::explosive = 0;
	    tie %^H, hhtie;
	    $^H{foo} = bar;
	    $hhtie::explosive = 1;
    	}
	{ 1; }
    `;
}, 'hint-hash copying does not leak');

package explosive_array {
    sub TIEARRAY  { bless [[], {}], $_[0]  }
    sub FETCH     { die if $_[0]->[1]{FETCH}; $_[0]->[0][$_[1]]  }
    sub FETCHSIZE { die if $_[0]->[1]{FETCHSIZE}; scalar @{ $_[0]->[0]  }  }
    sub STORE     { die if $_[0]->[1]{STORE}; $_[0]->[0][$_[1]] = $_[2]  }
    sub CLEAR     { die if $_[0]->[1]{CLEAR}; @{$_[0]->[0]} = ()  }
    sub EXTEND    { die if $_[0]->[1]{EXTEND}; return  }
    sub explode   { my $self = shift; $self->[1] = {@_} }
}

leak(2, 0, sub {
    tie my @a, 'explosive_array';
    tied(@a)->explode( STORE => 1 );
    my $x = 0;
    eval { @a = ($x)  };
}, 'explosive array assignment does not leak');

leak(2, 0, sub {
    my ($a, $b);
    eval { warn $die_on_fetch };
}, 'explosive warn argument');

leak(2, 0, sub {
    my $foo = sub { return $die_on_fetch };
    my $res = eval { $foo->() };
    my @res = eval { $foo->() };
}, 'function returning explosive does not leak');

leak(2, 0, sub {
    my $res = eval { {$die_on_fetch, 0} };
    $res = eval { {0, $die_on_fetch} };
}, 'building anon hash with explosives does not leak');

leak(2, 0, sub {
    my $res = eval { [$die_on_fetch] };
}, 'building anon array with explosives does not leak');

leak(2, 0, sub {
    my @a;
    eval { push @a, $die_on_fetch };
}, 'pushing exploding scalar does not leak');

leak(2, 0, sub {
    eval { push @-, '' };
}, 'pushing onto read-only array does not leak');


# Run-time regexp code blocks
{
    use re 'eval';
    my @tests = ('[(?{})]','(?{})');
    for my $t (@tests) {
	leak(2, 0, sub {
	    / $t/;
	}, "/ \$x/ where \$x is $t does not leak");
	leak(2, 0, sub {
	    /(?{})$t/;
	}, "/(?{})\$x/ where \$x is $t does not leak");
    }
}


{
    use warnings FATAL => 'all';
    leak(2, 0, sub {
	no warnings 'once';
	eval { printf uNopened 42 };
    }, 'printfing to bad handle under fatal warnings does not leak');
    open my $fh, ">", \my $buf;
    leak(2, 0, sub {
	eval { printf $fh chr 2455 };
    }, 'wide fatal warning does not make printf leak');
    close $fh or die $!;
}


leak(2,0,sub{eval{require untohunothu}}, 'requiring nonexistent module');
Commit	Line	Data
d97c33b5 DM	1	#!./perl
	2
	3	# A place to put some simple leak tests. Uses XS::APItest to make
64dc9714	4	# PL_sv_count available, allowing us to run a bit of code multiple times and
d97c33b5 DM	5	# see if the count increases.
	6
	7	BEGIN {
	8	chdir 't';
	9	@INC = '../lib';
	10	require './test.pl';
	11
	12	eval { require XS::APItest; XS::APItest->import('sv_count'); 1 }
	13	or skip_all("XS::APItest not available");
	14	}
	15
ef09a500 DM	16	use Config;
ef09a500 DM	17
1cac5c33	18	plan tests => 68;
d97c33b5 DM	19
	20	# run some code N times. If the number of SVs at the end of loop N is
	21	# greater than (N-1)*delta at the end of loop 1, we've got a leak
	22	#
	23	sub leak {
	24	my ($n, $delta, $code, @rest) = @_;
	25	my $sv0 = 0;
	26	my $sv1 = 0;
	27	for my $i (1..$n) {
	28	&$code();
	29	$sv1 = sv_count();
	30	$sv0 = $sv1 if $i == 1;
	31	}
	32	cmp_ok($sv1-$sv0, '<=', ($n-1)*$delta, @rest);
	33	}
	34
1cac5c33 FC	35	# Like leak, but run a string eval instead.
1cac5c33 FC	36	# The code is used instead of the test name
2e880be7 FC	37	# if the name is absent.
	38	sub eleak {
	39	my ($n,$delta,$code,@rest) = @_;
1cac5c33	40	leak $n, $delta, sub { eval $code },
2e880be7 FC	41	@rest ? @rest : $code
	42	}
	43
8bd05d90 DM	44	# run some expression N times. The expr is concatenated N times and then
	45	# evaled, ensuring that that there are no scope exits between executions.
	46	# If the number of SVs at the end of expr N is greater than (N-1)*delta at
	47	# the end of expr 1, we've got a leak
	48	#
	49	sub leak_expr {
	50	my ($n, $delta, $expr, @rest) = @_;
	51	my $sv0 = 0;
	52	my $sv1 = 0;
	53	my $true = 1; # avoid stuff being optimised away
	54	my $code1 = "($expr \|\| \$true)";
	55	my $code = "$code1 && (\$sv0 = sv_count())" . ("&& $code1" x 4)
	56	. " && (\$sv1 = sv_count())";
	57	if (eval $code) {
	58	cmp_ok($sv1-$sv0, '<=', ($n-1)*$delta, @rest);
	59	}
	60	else {
	61	fail("eval @rest: $@");
	62	}
	63	}
	64
	65
d97c33b5 DM	66	my @a;
	67
	68	leak(5, 0, sub {}, "basic check 1 of leak test infrastructure");
	69	leak(5, 0, sub {push @a,1;pop @a}, "basic check 2 of leak test infrastructure");
	70	leak(5, 1, sub {push @a,1;}, "basic check 3 of leak test infrastructure");
459defa1	71
e88567f2 FC	72	eleak(2, 0, 'sub{<*>}');
e88567f2 FC	73
110af908 FC	74	eleak(2, 0, 'goto sub {}', 'goto &sub in eval');
	75	eleak(2, 0, '() = sort { goto sub {} } 1,2', 'goto &sub in sort');
	76	eleak(2, 0, '/(?{ goto sub {} })/', 'goto &sub in regexp');
	77
459defa1 DM	78	sub TIEARRAY { bless [], $_[0] }
	79	sub FETCH { $_[0]->[$_[1]] }
	80	sub STORE { $_[0]->[$_[1]] = $_[2] }
	81
	82	# local $tied_elem[..] leaks <20020502143736.N16831@dansat.data-plan.com>"
	83	{
	84	tie my @a, 'main';
	85	leak(5, 0, sub {local $a[0]}, "local \$tied[0]");
	86	}
	87
8bd05d90 DM	88	# [perl #74484] repeated tries leaked SVs on the tmps stack
8bd05d90 DM	89
2e64971a	90	leak_expr(5, 0, q{"YYYYYa" =~ /.+?(a(.+?)\|b)/ }, "trie leak");
b2a2a901 DM	91
	92	# [perl #48004] map/grep didn't free tmps till the end
	93
	94	{
	95	# qr/1/ just creates tmps that are hopefully freed per iteration
	96
	97	my $s;
	98	my @a;
	99	my @count = (0) x 4; # pre-allocate
	100
	101	grep qr/1/ && ($count[$_] = sv_count()) && 99, 0..3;
	102	is(@count[3] - @count[0], 0, "void grep expr: no new tmps per iter");
	103	grep { qr/1/ && ($count[$_] = sv_count()) && 99 } 0..3;
	104	is(@count[3] - @count[0], 0, "void grep block: no new tmps per iter");
	105
	106	$s = grep qr/1/ && ($count[$_] = sv_count()) && 99, 0..3;
	107	is(@count[3] - @count[0], 0, "scalar grep expr: no new tmps per iter");
	108	$s = grep { qr/1/ && ($count[$_] = sv_count()) && 99 } 0..3;
	109	is(@count[3] - @count[0], 0, "scalar grep block: no new tmps per iter");
	110
	111	@a = grep qr/1/ && ($count[$_] = sv_count()) && 99, 0..3;
	112	is(@count[3] - @count[0], 0, "list grep expr: no new tmps per iter");
	113	@a = grep { qr/1/ && ($count[$_] = sv_count()) && 99 } 0..3;
	114	is(@count[3] - @count[0], 0, "list grep block: no new tmps per iter");
	115
	116
	117	map qr/1/ && ($count[$_] = sv_count()) && 99, 0..3;
	118	is(@count[3] - @count[0], 0, "void map expr: no new tmps per iter");
	119	map { qr/1/ && ($count[$_] = sv_count()) && 99 } 0..3;
	120	is(@count[3] - @count[0], 0, "void map block: no new tmps per iter");
	121
	122	$s = map qr/1/ && ($count[$_] = sv_count()) && 99, 0..3;
	123	is(@count[3] - @count[0], 0, "scalar map expr: no new tmps per iter");
	124	$s = map { qr/1/ && ($count[$_] = sv_count()) && 99 } 0..3;
	125	is(@count[3] - @count[0], 0, "scalar map block: no new tmps per iter");
	126
	127	@a = map qr/1/ && ($count[$_] = sv_count()) && 99, 0..3;
	128	is(@count[3] - @count[0], 3, "list map expr: one new tmp per iter");
	129	@a = map { qr/1/ && ($count[$_] = sv_count()) && 99 } 0..3;
	130	is(@count[3] - @count[0], 3, "list map block: one new tmp per iter");
	131
	132	}
a50d6ed0 TC	133
	134	SKIP:
	135	{ # broken by 304474c3, fixed by cefd5c7c, but didn't seem to cause
	136	# any other test failures
	137	# base test case from ribasushi (Peter Rabbitson)
	138	eval { require Scalar::Util; Scalar::Util->import("weaken"); 1; }
	139	or skip "no weaken", 1;
	140	my $weak;
	141	{
	142	$weak = my $in = {};
	143	weaken($weak);
	144	my $out = { in => $in, in => undef }
	145	}
	146	ok(!$weak, "hash referenced weakened SV released");
	147	}
64dc9714 DM	148
	149	# RT #72246: rcatline memory leak on bad $/
	150
	151	leak(2, 0,
	152	sub {
	153	my $f;
	154	open CATLINE, '<', \$f;
	155	local $/ = "\x{262E}";
	156	my $str = "\x{2622}";
	157	eval { $str .= <CATLINE> };
	158	},
	159	"rcatline leak"
	160	);
a17b8556 JP	161
	162	{
	163	my $RE = qr/
	164	(?:
	165	<(?<tag>
	166	\s*
	167	[^>\s]+
	168	)>
	169	)??
	170	/xis;
	171
	172	"<html><body></body></html>" =~ m/$RE/gcs;
	173
	174	leak(5, 0, sub {
	175	my $tag = $+{tag};
	176	}, "named regexp captures");
	177	}
bcb2959f	178
2e880be7 FC	179	eleak(2,0,'/[:]/');
2e880be7 FC	180	eleak(2,0,'/[\xdf]/i');
f248b511	181	eleak(2,0,'s![^/]!!');
3451022d FC	182	eleak(2,0,'/[pp]/');
3451022d FC	183	eleak(2,0,'/[[:ascii:]]/');
e1ff3a88	184	leak(2,0,sub { /(??{})/ }, '/(??{})/');
2e880be7	185
bcb2959f	186	leak(2,0,sub { !$^V }, '[perl #109762] version object in boolean context');
d97935e0 DM	187
	188
	189	# [perl #114356] run-time rexexp with unchanging pattern got
	190	# inflated refcounts
1cac5c33	191	eleak(2, 0, q{ my $x = "x"; "abc" =~ /$x/ for 1..5 }, '#114356');
d97935e0	192
1cac5c33	193	eleak(2, 0, 'sub', '"sub" with nothing following');
12d3c230	194	eleak(2, 0, '+sub:a{}', 'anon subs with invalid attributes');
9ffcdca1	195	eleak(2, 0, 'no warnings; sub a{1 1}', 'sub with syntax error');
4d2dfd15	196	eleak(2, 0, 'no warnings; sub {1 1}', 'anon sub with syntax error');
12d3c230	197
47c8e7fe FC	198	# Syntax errors
	199	eleak(2, 0, '"${<<END}"
	200	', 'unterminated here-doc in quotes in multiline eval');
	201	eleak(2, 0, '"${<<END
	202	}"', 'unterminated here-doc in multiline quotes in eval');
1cac5c33	203	leak(2, 0, sub { eval { do './op/svleak.pl' } },
2d85e411	204	'unterminated here-doc in file');
47c8e7fe FC	205	eleak(2, 0, 'tr/9-0//');
	206	eleak(2, 0, 'tr/a-z-0//');
	207	eleak(2, 0, 'no warnings; nonexistent_function 33838',
a577af66	208	'bareword followed by number');
10002bc1 FC	209	eleak(2, 0, '//dd;'x20, '"too many errors" when parsing m// flags');
10002bc1 FC	210	eleak(2, 0, 's///dd;'x20, '"too many errors" when parsing s/// flags');
1cac5c33	211	eleak(2, 0, 'no warnings; 2 2;BEGIN{}',
9eb48717	212	'BEGIN block after syntax error');
600beb2e FC	213	{
	214	local %INC; # in case Errno is already loaded
	215	eleak(2, 0, 'no warnings; 2@!{',
	216	'implicit "use Errno" after syntax error');
	217	}
3ce3dcd9	218	eleak(2, 0, "\"\$\0\356\"", 'qq containing $ <null> something');
9e942bf5 FC	219	{
	220	local $::TODO = 'eval "END blah blah" still leaks';
	221	eleak(2, 0, 'END OF TERMS AND CONDITIONS', 'END followed by words');
	222	}
	223
9fa29fa7 FC	224
	225	# [perl #114764] Attributes leak scalars
	226	leak(2, 0, sub { eval 'my $x : shared' }, 'my $x :shared used to leak');
895cdc83	227
c25611d5 FC	228	eleak(2, 0, 'ref: 1', 'labels');
c25611d5 FC	229
895cdc83 FC	230	# Tied hash iteration was leaking if the hash was freed before itera-
	231	# tion was over.
	232	package t {
	233	sub TIEHASH { bless [] }
	234	sub FIRSTKEY { 0 }
	235	}
	236	leak(2, 0, sub {
	237	my $h = {};
	238	tie %$h, t;
	239	each %$h;
	240	undef $h;
	241	}, 'tied hash iteration does not leak');
9c744f4f	242
33b889b0 RZ	243	package explosive_scalar {
	244	sub TIESCALAR { my $self = shift; bless [undef, {@_}], $self }
	245	sub FETCH { die 'FETCH' if $_[0][1]{FETCH}; $_[0][0] }
	246	sub STORE { die 'STORE' if $_[0][1]{STORE}; $_[0][0] = $_[1] }
	247	}
	248	tie my $die_on_fetch, 'explosive_scalar', FETCH => 1;
	249
39984de3 FC	250	# List assignment was leaking when assigning explosive scalars to
39984de3 FC	251	# aggregates.
9c744f4f	252	leak(2, 0, sub {
33b889b0 RZ	253	eval {%a = ($die_on_fetch, 0)}; # key
	254	eval {%a = (0, $die_on_fetch)}; # value
	255	eval {%a = ($die_on_fetch, $die_on_fetch)}; # both
9c744f4f	256	}, 'hash assignment does not leak');
39984de3	257	leak(2, 0, sub {
33b889b0 RZ	258	eval {@a = ($die_on_fetch)};
	259	eval {($die_on_fetch, $b) = ($b, $die_on_fetch)};
	260	# restore
	261	tie $die_on_fetch, 'explosive_scalar', FETCH => 1;
39984de3	262	}, 'array assignment does not leak');
9c744f4f	263
0db511c0 FC	264	# [perl #107000]
	265	package hhtie {
	266	sub TIEHASH { bless [] }
	267	sub STORE { $_[0][0]{$_[1]} = $_[2] }
	268	sub FETCH { die if $explosive; $_[0][0]{$_[1]} }
	269	sub FIRSTKEY { keys %{$_[0][0]}; each %{$_[0][0]} }
	270	sub NEXTKEY { each %{$_[0][0]} }
	271	}
1cac5c33	272	leak(2, 0, sub {
0db511c0 FC	273	eval q`
	274	BEGIN {
	275	$hhtie::explosive = 0;
	276	tie %^H, hhtie;
	277	$^H{foo} = bar;
	278	$hhtie::explosive = 1;
	279	}
	280	{ 1; }
	281	`;
	282	}, 'hint-hash copying does not leak');
33b889b0 RZ	283
	284	package explosive_array {
	285	sub TIEARRAY { bless [[], {}], $_[0] }
	286	sub FETCH { die if $_[0]->[1]{FETCH}; $_[0]->[0][$_[1]] }
	287	sub FETCHSIZE { die if $_[0]->[1]{FETCHSIZE}; scalar @{ $_[0]->[0] } }
	288	sub STORE { die if $_[0]->[1]{STORE}; $_[0]->[0][$_[1]] = $_[2] }
	289	sub CLEAR { die if $_[0]->[1]{CLEAR}; @{$_[0]->[0]} = () }
	290	sub EXTEND { die if $_[0]->[1]{EXTEND}; return }
	291	sub explode { my $self = shift; $self->[1] = {@_} }
	292	}
	293
	294	leak(2, 0, sub {
	295	tie my @a, 'explosive_array';
	296	tied(@a)->explode( STORE => 1 );
	297	my $x = 0;
	298	eval { @a = ($x) };
	299	}, 'explosive array assignment does not leak');
	300
	301	leak(2, 0, sub {
	302	my ($a, $b);
	303	eval { warn $die_on_fetch };
	304	}, 'explosive warn argument');
	305
	306	leak(2, 0, sub {
	307	my $foo = sub { return $die_on_fetch };
	308	my $res = eval { $foo->() };
	309	my @res = eval { $foo->() };
	310	}, 'function returning explosive does not leak');
	311
	312	leak(2, 0, sub {
	313	my $res = eval { {$die_on_fetch, 0} };
	314	$res = eval { {0, $die_on_fetch} };
	315	}, 'building anon hash with explosives does not leak');
	316
	317	leak(2, 0, sub {
3ed356df FC	318	my $res = eval { [$die_on_fetch] };
	319	}, 'building anon array with explosives does not leak');
	320
	321	leak(2, 0, sub {
33b889b0 RZ	322	my @a;
	323	eval { push @a, $die_on_fetch };
	324	}, 'pushing exploding scalar does not leak');
ddac780e	325
644ac3a8 FC	326	leak(2, 0, sub {
	327	eval { push @-, '' };
	328	}, 'pushing onto read-only array does not leak');
	329
ddac780e FC	330
	331	# Run-time regexp code blocks
	332	{
2ac13048 FC	333	use re 'eval';
2ac13048 FC	334	my @tests = ('[(?{})]','(?{})');
ddac780e	335	for my $t (@tests) {
1cac5c33	336	leak(2, 0, sub {
ddac780e FC	337	/ $t/;
ddac780e FC	338	}, "/ \$x/ where \$x is $t does not leak");
1cac5c33	339	leak(2, 0, sub {
ddac780e FC	340	/(?{})$t/;
	341	}, "/(?{})\$x/ where \$x is $t does not leak");
	342	}
	343	}
104c40b0 FC	344
	345
	346	{
	347	use warnings FATAL => 'all';
	348	leak(2, 0, sub {
d861347e	349	no warnings 'once';
104c40b0 FC	350	eval { printf uNopened 42 };
104c40b0 FC	351	}, 'printfing to bad handle under fatal warnings does not leak');
c7bd8b84 FC	352	open my $fh, ">", \my $buf;
	353	leak(2, 0, sub {
	354	eval { printf $fh chr 2455 };
	355	}, 'wide fatal warning does not make printf leak');
	356	close $fh or die $!;
104c40b0	357	}
1e5f02b3 FC	358
	359
	360	leak(2,0,sub{eval{require untohunothu}}, 'requiring nonexistent module');