#!./perl
-# $RCSfile: goto.t,v $$Revision: 4.1 $$Date: 92/08/07 18:27:56 $
+# "This IS structured code. It's just randomly structured."
-print "1..5\n";
+BEGIN {
+ chdir 't' if -d 't';
+ @INC = qw(. ../lib);
+ require "test.pl";
+}
+
+use warnings;
+use strict;
+plan tests => 58;
+our $TODO;
+our $foo;
while ($?) {
$foo = 1;
label1:
$foo = 3;
label2:
-print "#1\t:$foo: == 2\n";
-if ($foo == 2) {print "ok 1\n";} else {print "not ok 1\n";}
+is($foo, 2, 'escape while loop');
goto label3;
label4:
-print "#2\t:$foo: == 4\n";
-if ($foo == 4) {print "ok 2\n";} else {print "not ok 2\n";}
+is($foo, 4, 'second escape while loop');
-$x = `./perl -e 'goto foo;' 2>&1`;
-if ($x =~ /label/) {print "ok 3\n";} else {print "not ok 3\n";}
+my $r = run_perl(prog => 'goto foo;', stderr => 1);
+like($r, qr/label/, 'cant find label');
+my $ok = 0;
sub foo {
goto bar;
- print "not ok 4\n";
return;
bar:
- print "ok 4\n";
+ $ok = 1;
}
&foo;
+ok($ok, 'goto in sub');
sub bar {
- $x = 'exitcode';
- eval "goto $x"; # Do not take this as exemplary code!!!
+ my $x = 'bypass';
+ eval "goto $x";
}
&bar;
exit;
-exitcode:
-print "ok 5\n";
+
+FINALE:
+is(curr_test(), 16, 'FINALE');
+
+# does goto LABEL handle block contexts correctly?
+# note that this scope-hopping differs from last & next,
+# which always go up-scope strictly.
+my $count = 0;
+my $cond = 1;
+for (1) {
+ if ($cond == 1) {
+ $cond = 0;
+ goto OTHER;
+ }
+ elsif ($cond == 0) {
+ OTHER:
+ $cond = 2;
+ is($count, 0, 'OTHER');
+ $count++;
+ goto THIRD;
+ }
+ else {
+ THIRD:
+ is($count, 1, 'THIRD');
+ $count++;
+ }
+}
+is($count, 2, 'end of loop');
+
+# Does goto work correctly within a for(;;) loop?
+# (BUG ID 20010309.004)
+
+for(my $i=0;!$i++;) {
+ my $x=1;
+ goto label;
+ label: is($x, 1, 'goto inside a for(;;) loop body from inside the body');
+}
+
+# Does goto work correctly going *to* a for(;;) loop?
+# (make sure it doesn't skip the initializer)
+
+my ($z, $y) = (0);
+FORL1: for ($y=1; $z;) {
+ ok($y, 'goto a for(;;) loop, from outside (does initializer)');
+ goto TEST19}
+($y,$z) = (0, 1);
+goto FORL1;
+
+# Even from within the loop?
+TEST19: $z = 0;
+FORL2: for($y=1; 1;) {
+ if ($z) {
+ ok($y, 'goto a for(;;) loop, from inside (does initializer)');
+ last;
+ }
+ ($y, $z) = (0, 1);
+ goto FORL2;
+}
+
+# Does goto work correctly within a try block?
+# (BUG ID 20000313.004) - [perl #2359]
+$ok = 0;
+eval {
+ my $variable = 1;
+ goto LABEL20;
+ LABEL20: $ok = 1 if $variable;
+};
+ok($ok, 'works correctly within a try block');
+is($@, "", '...and $@ not set');
+
+# And within an eval-string?
+$ok = 0;
+eval q{
+ my $variable = 1;
+ goto LABEL21;
+ LABEL21: $ok = 1 if $variable;
+};
+ok($ok, 'works correctly within an eval string');
+is($@, "", '...and $@ still not set');
+
+
+# Test that goto works in nested eval-string
+$ok = 0;
+{eval q{
+ eval q{
+ goto LABEL22;
+ };
+ $ok = 0;
+ last;
+
+ LABEL22: $ok = 1;
+};
+$ok = 0 if $@;
+}
+ok($ok, 'works correctly in a nested eval string');
+
+{
+ my $false = 0;
+ my $count;
+
+ $ok = 0;
+ { goto A; A: $ok = 1 } continue { }
+ ok($ok, '#20357 goto inside /{ } continue { }/ loop');
+
+ $ok = 0;
+ { do { goto A; A: $ok = 1 } while $false }
+ ok($ok, '#20154 goto inside /do { } while ()/ loop');
+ $ok = 0;
+ foreach(1) { goto A; A: $ok = 1 } continue { };
+ ok($ok, 'goto inside /foreach () { } continue { }/ loop');
+
+ $ok = 0;
+ sub a {
+ A: { if ($false) { redo A; B: $ok = 1; redo A; } }
+ goto B unless $count++;
+ }
+ a();
+ ok($ok, '#19061 loop label wiped away by goto');
+
+ $ok = 0;
+ my $p;
+ for ($p=1;$p && goto A;$p=0) { A: $ok = 1 }
+ ok($ok, 'weird case of goto and for(;;) loop');
+}
+
+# bug #9990 - don't prematurely free the CV we're &going to.
+
+sub f1 {
+ my $x;
+ goto sub { $x=0; ok(1,"don't prematurely free CV\n") }
+}
+f1();
+
+# bug #22181 - this used to coredump or make $x undefined, due to
+# erroneous popping of the inner BLOCK context
+
+undef $ok;
+for ($count=0; $count<2; $count++) {
+ my $x = 1;
+ goto LABEL29;
+ LABEL29:
+ $ok = $x;
+}
+is($ok, 1, 'goto in for(;;) with continuation');
+
+# bug #22299 - goto in require doesn't find label
+
+open my $f, ">goto01.pm" or die;
+print $f <<'EOT';
+package goto01;
+goto YYY;
+die;
+YYY: print "OK\n";
+1;
+EOT
+close $f;
+
+$r = runperl(prog => 'use goto01; print qq[DONE\n]');
+is($r, "OK\nDONE\n", "goto within use-d file");
+unlink "goto01.pm";
+
+# test for [perl #24108]
+$ok = 1;
+$count = 0;
+sub i_return_a_label {
+ $count++;
+ return "returned_label";
+}
+eval { goto +i_return_a_label; };
+$ok = 0;
+
+returned_label:
+is($count, 1, 'called i_return_a_label');
+ok($ok, 'skipped to returned_label');
+
+# [perl #29708] - goto &foo could leave foo() at depth two with
+# @_ == PL_sv_undef, causing a coredump
+
+
+$r = runperl(
+ prog =>
+ 'sub f { return if $d; $d=1; my $a=sub {goto &f}; &$a; f() } f(); print qq(ok\n)',
+ stderr => 1
+ );
+is($r, "ok\n", 'avoid pad without an @_');
+
+goto moretests;
+fail('goto moretests');
+exit;
+
+bypass:
+
+is(curr_test(), 5, 'eval "goto $x"');
+
+# Test autoloading mechanism.
+
+sub two {
+ my ($pack, $file, $line) = caller; # Should indicate original call stats.
+ is("@_ $pack $file $line", "1 2 3 main $::FILE $::LINE",
+ 'autoloading mechanism.');
+}
+
+sub one {
+ eval <<'END';
+ no warnings 'redefine';
+ sub one { pass('sub one'); goto &two; fail('sub one tail'); }
+END
+ goto &one;
+}
+
+$::FILE = __FILE__;
+$::LINE = __LINE__ + 1;
+&one(1,2,3);
+
+{
+ my $wherever = 'NOWHERE';
+ eval { goto $wherever };
+ like($@, qr/Can't find label NOWHERE/, 'goto NOWHERE sets $@');
+}
+
+# see if a modified @_ propagates
+{
+ my $i;
+ package Foo;
+ sub DESTROY { my $s = shift; ::is($s->[0], $i, "destroy $i"); }
+ sub show { ::is(+@_, 5, "show $i",); }
+ sub start { push @_, 1, "foo", {}; goto &show; }
+ for (1..3) { $i = $_; start(bless([$_]), 'bar'); }
+}
+
+sub auto {
+ goto &loadit;
+}
+
+sub AUTOLOAD { $ok = 1 if "@_" eq "foo" }
+
+$ok = 0;
+auto("foo");
+ok($ok, 'autoload');
+
+{
+ my $wherever = 'FINALE';
+ goto $wherever;
+}
+fail('goto $wherever');
+
+moretests:
+# test goto duplicated labels.
+{
+ my $z = 0;
+ eval {
+ $z = 0;
+ for (0..1) {
+ L4: # not outer scope
+ $z += 10;
+ last;
+ }
+ goto L4 if $z == 10;
+ last;
+ };
+ like($@, qr/Can't "goto" into the middle of a foreach loop/,
+ 'catch goto middle of foreach');
+
+ $z = 0;
+ # ambiguous label resolution (outer scope means endless loop!)
+ L1:
+ for my $x (0..1) {
+ $z += 10;
+ is($z, 10, 'prefer same scope (loop body) to outer scope (loop entry)');
+ goto L1 unless $x;
+ $z += 10;
+ L1:
+ is($z, 10, 'prefer same scope: second');
+ last;
+ }
+
+ $z = 0;
+ L2:
+ {
+ $z += 10;
+ is($z, 10, 'prefer this scope (block body) to outer scope (block entry)');
+ goto L2 if $z == 10;
+ $z += 10;
+ L2:
+ is($z, 10, 'prefer this scope: second');
+ }
+
+
+ {
+ $z = 0;
+ while (1) {
+ L3: # not inner scope
+ $z += 10;
+ last;
+ }
+ is($z, 10, 'prefer this scope to inner scope');
+ goto L3 if $z == 10;
+ $z += 10;
+ L3: # this scope !
+ is($z, 10, 'prefer this scope to inner scope: second');
+ }
+
+ L4: # not outer scope
+ {
+ $z = 0;
+ while (1) {
+ L4: # not inner scope
+ $z += 1;
+ last;
+ }
+ is($z, 1, 'prefer this scope to inner,outer scopes');
+ goto L4 if $z == 1;
+ $z += 10;
+ L4: # this scope !
+ is($z, 1, 'prefer this scope to inner,outer scopes: second');
+ }
+
+ {
+ my $loop = 0;
+ for my $x (0..1) {
+ L2: # without this, fails 1 (middle) out of 3 iterations
+ $z = 0;
+ L2:
+ $z += 10;
+ is($z, 10,
+ "same label, multiple times in same scope (choose 1st) $loop");
+ goto L2 if $z == 10 and not $loop++;
+ }
+ }
+}
+
+# deep recursion with gotos eventually caused a stack reallocation
+# which messed up buggy internals that didn't expect the stack to move
+
+sub recurse1 {
+ unshift @_, "x";
+ no warnings 'recursion';
+ goto &recurse2;
+}
+sub recurse2 {
+ my $x = shift;
+ $_[0] ? +1 + recurse1($_[0] - 1) : 0
+}
+is(recurse1(500), 500, 'recursive goto &foo');
+
+# [perl #32039] Chained goto &sub drops data too early.
+
+sub a32039 { @_=("foo"); goto &b32039; }
+sub b32039 { goto &c32039; }
+sub c32039 { is($_[0], 'foo', 'chained &goto') }
+a32039();
+
+# [perl #35214] next and redo re-entered the loop with the wrong cop,
+# causing a subsequent goto to crash
+
+{
+ my $r = runperl(
+ stderr => 1,
+ prog =>
+'for ($_=0;$_<3;$_++){A: if($_==1){next} if($_==2){$_++;goto A}}print qq(ok\n)'
+ );
+ is($r, "ok\n", 'next and goto');
+
+ $r = runperl(
+ stderr => 1,
+ prog =>
+'for ($_=0;$_<3;$_++){A: if($_==1){$_++;redo} if($_==2){$_++;goto A}}print qq(ok\n)'
+ );
+ is($r, "ok\n", 'redo and goto');
+}
+
+# goto &foo not allowed in evals
+
+
+sub null { 1 };
+eval 'goto &null';
+like($@, qr/Can't goto subroutine from an eval-string/, 'eval string');
+eval { goto &null };
+like($@, qr/Can't goto subroutine from an eval-block/, 'eval block');
+
+# [perl #36521] goto &foo in warn handler could defeat recursion avoider
+
+{
+ my $r = runperl(
+ stderr => 1,
+ prog => 'my $d; my $w = sub { return if $d++; warn q(bar)}; local $SIG{__WARN__} = sub { goto &$w; }; warn q(foo);'
+ );
+ like($r, qr/bar/, "goto &foo in warn");
+}
+
+TODO: {
+ local $TODO = "[perl #43403] goto() from an if to an else doesn't undo local () changes";
+ our $global = "unmodified";
+ if ($global) { # true but not constant-folded
+ local $global = "modified";
+ goto ELSE;
+ } else {
+ ELSE: is($global, "unmodified");
+ }
+}
+
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