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tie_fetch_count.t
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tie_fetch_count.t
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#!./perl
# Tests counting number of FETCHes.
#
# See Bugs #76814 and #87708.
BEGIN {
chdir 't' if -d 't';
require './test.pl';
set_up_inc('../lib');
}
plan (tests => 343);
use strict;
use warnings;
my $can_config = eval { require Config; 1 };
my $count = 0;
# Usage:
# tie $var, "main", $val; # FETCH returns $val
# tie $var, "main", $val1, $val2; # FETCH returns the values in order,
# # one at a time, repeating the last
# # when the list is exhausted.
sub TIESCALAR {my $pack = shift; bless [@_], $pack;}
sub FETCH {$count ++; @{$_ [0]} == 1 ? ${$_ [0]}[0] : shift @{$_ [0]}}
sub STORE { unshift @{$_[0]}, $_[1] }
sub check_count {
my $op = shift;
my $expected = shift() // 1;
local $::Level = $::Level + 1;
is $count, $expected,
"FETCH called " . (
$expected == 1 ? "just once" :
$expected == 2 ? "twice" :
"$count times"
) . " using '$op'";
$count = 0;
}
my ($dummy, @dummy);
tie my $var => 'main', 1;
# Assignment.
$dummy = $var ; check_count "=";
*dummy = $var ; check_count '*glob = $tied';
# Unary +/-
$dummy = +$var ; check_count "unary +";
$dummy = -$var ; check_count "unary -";
# Basic arithmetic and string operators.
$dummy = $var + 1 ; check_count '+';
$dummy = $var - 1 ; check_count '-';
$dummy = $var / 1 ; check_count '/';
$dummy = $var * 1 ; check_count '*';
$dummy = $var % 1 ; check_count '%';
$dummy = $var ** 1 ; check_count '**';
$dummy = $var << 1 ; check_count '<<';
$dummy = $var >> 1 ; check_count '>>';
$dummy = $var x 1 ; check_count 'x';
@dummy = ($var) x 1 ; check_count 'x';
$dummy = $var . 1 ; check_count '.';
@dummy = $var .. 1 ; check_count '$tied..1';
@dummy = 1 .. $var; check_count '1..$tied';
tie my $v42 => 'main', "z";
@dummy = $v42 .. "a"; check_count '$tied.."a"';
@dummy = "a" .. $v42; check_count '"a"..$tied';
# Pre/post in/decrement
$var ++ ; check_count 'post ++';
$var -- ; check_count 'post --';
++ $var ; check_count 'pre ++';
-- $var ; check_count 'pre --';
# Numeric comparison
$dummy = $var < 1 ; check_count '<';
$dummy = $var <= 1 ; check_count '<=';
$dummy = $var == 1 ; check_count '==';
$dummy = $var >= 1 ; check_count '>=';
$dummy = $var > 1 ; check_count '>';
$dummy = $var != 1 ; check_count '!=';
$dummy = $var <=> 1 ; check_count '<=>';
# String comparison
$dummy = $var lt 1 ; check_count 'lt';
$dummy = $var le 1 ; check_count 'le';
$dummy = $var eq 1 ; check_count 'eq';
$dummy = $var ge 1 ; check_count 'ge';
$dummy = $var gt 1 ; check_count 'gt';
$dummy = $var ne 1 ; check_count 'ne';
$dummy = $var cmp 1 ; check_count 'cmp';
# Bitwise operators
$dummy = $var & 1 ; check_count '&';
$dummy = $var ^ 1 ; check_count '^';
$dummy = $var | 1 ; check_count '|';
$dummy = ~$var ; check_count '~';
# Logical operators
$dummy = !$var ; check_count '!';
tie my $v_1, "main", 0;
$dummy = $v_1 || 1 ; check_count '||';
$dummy = ($v_1 or 1); check_count 'or';
$dummy = $var && 1 ; check_count '&&';
$dummy = ($var and 1); check_count 'and';
$dummy = ($var xor 1); check_count 'xor';
$dummy = $var ? 1 : 1 ; check_count '?:';
# Overloadable functions
$dummy = sin $var ; check_count 'sin';
$dummy = cos $var ; check_count 'cos';
$dummy = exp $var ; check_count 'exp';
$dummy = abs $var ; check_count 'abs';
$dummy = log $var ; check_count 'log';
$dummy = sqrt $var ; check_count 'sqrt';
$dummy = int $var ; check_count 'int';
SKIP: {
unless ($can_config) {
skip "no config (no infinity for int)", 1;
}
unless ($Config::Config{d_double_has_inf}) {
skip "no infinity for int", 1;
}
$var = "inf" for 1..5;
$dummy = int $var ; check_count 'int $tied_inf';
}
$dummy = atan2 $var, 1 ; check_count 'atan2';
# Readline/glob
tie my $var0, "main", \*DATA;
$dummy = <$var0> ; check_count '<readline>';
$var = \1;
$var .= <DATA> ; check_count '$tiedref .= <rcatline>';
$var = "tied";
$var .= <DATA> ; check_count '$tiedstr .= <rcatline>';
$var = *foo;
$var .= <DATA> ; check_count '$tiedglob .= <rcatline>';
{ no warnings "glob";
$dummy = <${var}> ; check_count '<glob>';
}
# File operators
for (split //, 'rwxoRWXOezsfdpSbctugkTBMAC') {
no warnings 'unopened';
$dummy = eval "-$_ \$var"; check_count "-$_";
# Make $var hold a glob:
$var = *dummy; $dummy = $var; $count = 0;
$dummy = eval "-$_ \$var"; check_count "-$_ \$tied_glob";
next if /[guk]/;
$var = *dummy; $dummy = $var; $count = 0;
eval "\$dummy = -$_ \\\$var";
check_count "-$_ \\\$tied_glob";
}
$dummy = -l $var ; check_count '-l';
$var = "test.pl";
$dummy = -e -e -e $var ; check_count '-e -e';
# Matching
$_ = "foo";
$dummy = $var =~ m/ / ; check_count 'm//';
$dummy = $var =~ s/ //; check_count 's///';
{
no warnings 'deprecated';
$dummy = $var ~~ 1 ; check_count '~~';
}
$dummy = $var =~ y/ //; check_count 'y///';
$var = \1;
$dummy = $var =~y/ /-/; check_count '$ref =~ y///';
/$var/ ; check_count 'm/pattern/';
/$var foo/ ; check_count 'm/$tied foo/';
s/$var// ; check_count 's/pattern//';
s/$var foo// ; check_count 's/$tied foo//';
s/./$var/ ; check_count 's//replacement/';
# Dereferencing
tie my $var1 => 'main', \1;
$dummy = $$var1 ; check_count '${}';
tie my $var2 => 'main', [];
$dummy = @$var2 ; check_count '@{}';
tie my $var3 => 'main', {};
$dummy = %$var3 ; check_count '%{}';
{
no strict 'refs';
tie my $var4 => 'main', *];
$dummy = *$var4 ; check_count '*{}';
}
tie my $var5 => 'main', sub {1};
$dummy = &$var5 ; check_count '&{}';
{
no strict 'refs';
tie my $var1 => 'main', 1;
$dummy = $$var1 ; check_count 'symbolic ${}';
$dummy = @$var1 ; check_count 'symbolic @{}';
$dummy = %$var1 ; check_count 'symbolic %{}';
$dummy = *$var1 ; check_count 'symbolic *{}';
local *1 = sub{};
$dummy = &$var1 ; check_count 'symbolic &{}';
# This test will not be a complete test if *988 has been created
# already. If this dies, change it to use another built-in variable.
# In 5.10-14, rv2gv calls get-magic more times for built-in vars, which
# is why we need the test this way.
if (exists $::{988}) {
die "*988 already exists. Please adjust this test"
}
tie my $var6 => main => 988;
no warnings;
readdir $var6 ; check_count 'symbolic readdir';
if (exists $::{973}) { # Need a different variable here
die "*973 already exists. Please adjust this test"
}
tie my $var7 => main => 973;
defined $$var7 ; check_count 'symbolic defined ${}';
}
# Constructors
$dummy = {$var,$var} ; check_count '{}', 2;
$dummy = [$var] ; check_count '[]';
tie my $var8 => 'main', 'main';
sub bolgy {}
$var8->bolgy ; check_count '->method';
{
no warnings 'once';
() = *swibble;
# This must be the name of an existing glob to trigger the maximum
# number of fetches in 5.14:
tie my $var9 => 'main', 'swibble';
no strict 'refs';
use constant glumscrin => 'shreggleboughet';
*$var9 = \&{"glumscrin"}; check_count '*$tied = \&{"name of const"}';
}
# Functions that operate on filenames or filehandles
for ([chdir=>''],[chmod=>'0,'],[chown=>'0,0,'],[utime=>'0,0,'],
[truncate=>'',',0'],[stat=>''],[lstat=>''],[open=>'my $fh,"<&",'],
['()=sort'=>'',' 1,2,3']) {
my($op,$args,$postargs) = @$_; $postargs //= '';
# This line makes $var8 hold a glob:
$var8 = *dummy; $dummy = $var8; $count = 0;
eval "$op $args \$var8 $postargs";
check_count "$op $args\$tied_glob$postargs";
$var8 = *dummy; $dummy = $var8; $count = 0;
my $ref = \$var8;
eval "$op $args \$ref $postargs";
check_count "$op $args\\\$tied_glob$postargs";
}
SKIP:
{
skip "No Config", 4 unless $can_config;
skip "No crypt()", 4 unless $Config::Config{d_crypt};
$dummy = crypt $var,0; check_count 'crypt $tied, ...';
$dummy = crypt 0,$var; check_count 'crypt ..., $tied';
$var = substr(chr 256,0,0);
$dummy = crypt $var,0; check_count 'crypt $tied_utf8, ...';
$var = substr(chr 256,0,0);
$dummy = crypt 0,$var; check_count 'crypt ..., $tied_utf8';
}
SKIP:
{
skip "select not implemented on Win32 miniperl", 3
if $^O eq "MSWin32" and is_miniperl;
no warnings;
$var = *foo;
$dummy = select $var, undef, undef, 0
; check_count 'select $tied_glob, ...';
$var = \1;
$dummy = select $var, undef, undef, 0
; check_count 'select $tied_ref, ...';
$var = undef;
$dummy = select $var, undef, undef, 0
; check_count 'select $tied_undef, ...';
}
chop(my $u = "\xff\x{100}");
tie $var, "main", $u;
$dummy = pack "u", $var; check_count 'pack "u", $utf8';
$var = 0;
$dummy = pack "w", $var; check_count 'pack "w", $tied_int';
$var = "111111111111111111111111111111111111111111111111111111111111111";
$dummy = eval { pack "w", $var };
check_count 'pack "w", $tied_huge_int_as_str';
tie $var, "main", "\x{100}";
pos$var = 0 ; check_count 'lvalue pos $utf8';
$dummy=sprintf"%1s",$var; check_count 'sprintf "%1s", $utf8';
$dummy=sprintf"%.1s",$var; check_count 'sprintf "%.1s", $utf8';
my @fmt = qw(B b c D d i O o u U X x);
tie $var, "main", 23;
for (@fmt) {
$dummy=sprintf"%$_",$var; check_count "sprintf '%$_'"
}
SKIP: {
unless ($can_config) {
skip "no Config (no infinity for sprintf @fmt)", scalar @fmt;
}
unless ($Config::Config{d_double_has_inf}) {
skip "no infinity for sprintf @fmt", scalar @fmt;
}
tie $var, "main", "Inf";
for (@fmt) {
$dummy = eval { sprintf "%$_", $var };
check_count "sprintf '%$_', \$tied_inf"
}
}
tie $var, "main", "\x{100}";
$dummy = substr$var,0,1; check_count 'substr $utf8';
my $l =\substr$var,0,1;
$dummy = $$l ; check_count 'reading lvalue substr($utf8)';
$$l = 0 ; check_count 'setting lvalue substr($utf8)';
tie $var, "main", "a";
$$l = "\x{100}" ; check_count 'assigning $utf8 to lvalue substr';
tie $var1, "main", "a";
substr$var1,0,0,"\x{100}"; check_count '4-arg substr with utf8 replacement';
{
local $SIG{__WARN__} = sub {};
$dummy = warn $var ; check_count 'warn $tied';
tie $@, => 'main', 1;
$dummy = warn ; check_count 'warn() with $@ tied (num)';
tie $@, => 'main', \1;
$dummy = warn ; check_count 'warn() with $@ tied (ref)';
tie $@, => 'main', "foo\n";
$dummy = warn ; check_count 'warn() with $@ tied (str)';
untie $@;
}
###############################################
# Tests for $foo binop $foo #
###############################################
# These test that binary ops call FETCH twice if the same scalar is used
# for both operands. They also test that both return values from
# FETCH are used.
my %mutators = map { ($_ => 1) } qw(. + - * / % ** << >> & | ^);
sub _bin_test {
my $int = shift;
my $op = shift;
my $exp = pop;
my @fetches = @_;
$int = $int ? 'use integer; ' : '';
tie my $var, "main", @fetches;
is(eval "$int\$var $op \$var", $exp, "retval of $int\$var $op \$var");
check_count "$int$op", 2;
return unless $mutators{$op};
tie my $var2, "main", @fetches;
is(eval "$int \$var2 $op= \$var2", $exp, "retval of $int \$var2 $op= \$var2");
check_count "$int$op=", 3;
}
sub bin_test {
_bin_test(0, @_);
}
sub bin_int_test {
_bin_test(1, @_);
}
bin_test '**', 2, 3, 8;
bin_test '*' , 2, 3, 6;
bin_test '/' , 10, 2, 5;
bin_test '%' , 11, 2, 1;
bin_test 'x' , 11, 2, 1111;
bin_test '-' , 11, 2, 9;
bin_test '<<', 11, 2, 44;
bin_test '>>', 44, 2, 11;
bin_test '<' , 1, 2, 1;
bin_test '>' , 44, 2, 1;
bin_test '<=', 44, 2, "";
bin_test '>=', 1, 2, "";
bin_test '!=', 1, 2, 1;
bin_test '<=>', 1, 2, -1;
bin_test 'le', 4, 2, "";
bin_test 'lt', 1, 2, 1;
bin_test 'gt', 4, 2, 1;
bin_test 'ge', 1, 2, "";
bin_test 'eq', 1, 2, "";
bin_test 'ne', 1, 2, 1;
bin_test 'cmp', 1, 2, -1;
bin_test '&' , 1, 2, 0;
bin_test '|' , 1, 2, 3;
bin_test '^' , 3, 5, 6;
bin_test '.' , 1, 2, 12;
bin_test '==', 1, 2, "";
bin_test '+' , 1, 2, 3;
bin_int_test '*' , 2, 3, 6;
bin_int_test '/' , 10, 2, 5;
bin_int_test '%' , 11, 2, 1;
bin_int_test '+' , 1, 2, 3;
bin_int_test '-' , 11, 2, 9;
bin_int_test '<' , 1, 2, 1;
bin_int_test '>' , 44, 2, 1;
bin_int_test '<=', 44, 2, "";
bin_int_test '>=', 1, 2, "";
bin_int_test '==', 1, 2, "";
bin_int_test '!=', 1, 2, 1;
bin_int_test '<=>', 1, 2, -1;
tie $var, "main", 1, 4;
cmp_ok(atan2($var, $var), '<', .3, 'retval of atan2 $var, $var');
check_count 'atan2', 2;
__DATA__