Revision history for Variable-Magic

0.63    2022-09-20 21:45 UTC
        This is a maintenance release. The code contains no functional change.
        Satisfied users of version 0.62 can skip this update.
        + Fix : [RT #144052] : Add support for 5.37.3s PADSV_STORE optimization
       tests have been taught about this new thing.
                Thanks Richard Leach for contributing a patch.
        + Upd : Contact info.

0.62    2017-11-04 16:35 UTC
        + Fix : [RT #123314] : Compatibility with CV-in-stash optimisation
                Thanks Father Chrysostomos for reporting and contributing a

0.61    2017-01-24 15:30 UTC
        + Fix : [RT #115792] : Latest blead stack unwind work causes infloop
                in a test.
                A change in how the core frees temporary values after eval
                interacted badly with Variable::Magic and caused infinite loops
                when a free callback was attached to a wizard. This change was
                temporarily reverted, but is going to be reinstated, and
                Variable::Magic is now able to play nicely when this happens.
                Thanks Peter Rabbitson for reporting and David Mitchell for
                providing a fix.

0.60    2016-09-06 22:30 UTC
        + Chg : A large chunk of boilerplate XS code, which is also used in
                other XS modules, has been factored out of the main .xs file
                to a collection of .h files in the xsh subdirectory.
        + Fix : [RT #128989] : Bleadperl v5.25.3-266-g1d7e644 breaks V::M.
                Len magic is no longer called for negative array indices
                fetches, so the relevant tests are now skipped.
                Thanks Andreas Koenig for reporting.

0.59    2015-10-05 19:05 UTC
        + Chg : The magic callbacks are now always executed in a new stack.
                This should have no negative impact (performance-wise or
                behaviour-wise) on your code, but may actually fix some obscure
        + Fix : [RT #107294] : Crash during install of Variable-Magic-0.58
                running "t\18-opinfo.t".
                A recent change in the core implementation of transliterations
                caused an undefined behaviour when it interacted with this
                module, which resulted in visible stack corruption on Win32
                perls compiled with MSVC when the op_info feature was enabled.
                This was fixed by using a separate stack for the magic
                Thanks Peter Stokes for reporting and providing greatly
                helpful feedback.
        + Fix : The object op_info feature will now handle correctly Unicode
                transliteration, multideref and custom ops.

0.58    2015-07-21 16:00 UTC
        + Add : If a non-len magic callback returns a reference, it will now
                only be freed at the end of the statement that caused the
                magic to trigger. This allows the user to attach free magic
                (or a plain destructor) to a token returned from the callbacks
                in order to defer an action after the magic is processed by
        + Fix : Test failures of threads tests on systems with harsh resource
                constraints causing the threads to exit() during run.

0.57    2015-04-17 15:20 UTC
        + Chg : The new environment variable to enable thread tests on older
                perls is PERL_FORCE_TEST_THREADS. Note that this variable
                should only be turned on by authors.
        + Fix : Segfaults when the module is loaded by several threads (or
                Windows emulated processes) ran in parallel.
        + Fix : Segfaults when the module is loaded in a thread, which spawns
                itself a new thread, and that child thread outlives its parent.
        + Fix : Small memory leaks of structures required for thread safety.
        + Fix : Update the Windows ActivePerl + gcc 3.4 workaround for
                ExtUtils::MakeMaker 7.04. Thanks Christian Walde for reporting
                and feedback on this issue.
        + Tst : The global destruction test will now be exercised on any perl
                that has DEBUGGING set.
        + Tst : Optional capturing tests in t/17-ctl.t that were only run when
                Capture::Tiny was present were converted to an IPC::Open3
                based helper and will now be run everywhere.

0.56    2015-03-11 15:15 UTC
        + Fix : [RT #101410] : Install fails in blead
                Even though the change that caused this error was reverted from
                blead, lvalue uses of ERRSV have been removed from this module
                so that there will be no breakage when this change is possibly
                reintroduced in the following months.
                Thanks Dave Rolsky for reporting.
        + Tst : $ENV{$Config{ldlibpthname}} is now preserved on all platforms,
                which will address failures of t/17-ctl.t with unusual
                compilers (like icc) that link all their compiled objects to
                their own libraries.
        + Tst : The global destruction test is now only run on perl 5.13.4 and
                higher, and only if either Perl::Destruct::Level is installed
                or PERL_DESTRUCT_LEVEL is set and the perl is a debugging perl.
                This will solve rare crashes of t/15-self.t on perl 5.13.3 and

0.55    2014-10-20 23:45 UTC
        + Fix : [RT #99319] : t/18-opinfo.t: test failure due to change in
                perl 5 blead
                The new METHOP op class added in perl 5.21.5 is now supported.
                Thanks James E Keenan for reporting.

0.54    2014-09-22 17:30 UTC
        + Add : The new constant VMG_COMPAT_CODE_COPY_CLONE evaluates to true
                if your perl calls 'copy' magic when a magical code prototype
                is cloned, which is currently the case for perl 5.17.0 and
        + Fix : [RT #90205] : copy magic on subs puts raw CV in $_[3]
                $_[3] will now contain a reference to the cloned code when
                'copy' magic is called for a coderef.
                Thanks Lukas Mai for reporting.
        + Fix : t/35-stash.t has been taught about perl 5.21.4.
        + Fix : Tests using run_perl() in t/17-ctl.t will no longer fail on

0.53    2013-09-01 17:50 UTC
        This is a maintenance release. The code contains no functional change.
        Satisfied users of version 0.52 can skip this update.
        + Fix : [RT #86338] : typo fix.
                Thanks for the patch.
        + Tst : Author tests are no longer bundled with this distribution.
                They are only made available to authors in the git repository.

0.52    2012-11-05 02:30 UTC
        + Add : The new constant VMG_COMPAT_SCALAR_NOLEN evaluates to true
                when your perl does not call 'len' magic for scalars, which
                is the case for perl 5.17.4 and above.
                This fixes RT #80388.
        + Tst : t/35-stash.t has been taught about perl 5.17.4.
        + Tst : Author tests overhaul.

0.51    2012-08-18 15:00 UTC
        + Fix : It is now safe to call dispell() from inside 'free', 'copy' and
                'uvar' callbacks to dispell the magic currently in use.
                Thanks Clinton Gormley for reporting.
        + Fix : Exceptions thrown from inside a 'free' callback are now always
                consistently propagated outside of the callback. They used to
                be lost when the 'free' callback was invoked at the end of an
                eval block or string.
        + Fix : The 'reset RMG flag' workaroundn used to allow wizards with
                both 'uvar' and 'clear' magics to be cast onto a hash, has been
                made thread-safe.

0.50    2012-06-24 23:00 UTC
        + Fix : Less memory is leaked when a wizard is freed during global
                destruction, or when an exception is thrown from a 'free'
        + Fix : [RT #77991] : t/17-ctl.t fails on perl 5.14 and 5.16.
                This was actually an issue with ActivePerl, and this test
                has learned to cope with it.
                Thanks Gisle Aas for reporting.
        + Tst : t/35-stash.t has been taught about perl 5.17.1.
        + Doc : Many clarifications.

0.49    2012-06-05 21:40 UTC
        This is a maintenance release. The code contains no functional change.
        Satisfied users of version 0.48 can skip this update.
        + Fix : [RT #77644] : t/17_ctl.t fails in test 44 since 5.17.0.
                This test has been taught about perl 5.17.0.
                Thanks Reini Urban for reporting.
        + Tst : t/99-kwalitee.t will be skipped when only problematic versions
                of its dependencies are available.

0.48    2012-02-17 23:40 UTC
        + Add : You can now pass a reference to undef as the magic callback in
                order to install a no-op callback.
                Thanks Florian Ragwitz for the suggestion.

0.47    2011-10-27 16:55 UTC
        + Add : The new constant VMG_COMPAT_HASH_DELETE_NOUVAR_VOID evaluates
                to true when "delete $hash{key}" does not call 'delete' uvar
                magic in void context.
        + Chg : The MAGIC tokens created by this module no longer use the
                mg_private member for storing a "magical" signature.
        + Fix : Triggering magic in a thread on a variable cloned from the main
                interpreter, and when the wizard already went out of scope,
                will not segfault anymore.
        + Opt : The pointer table is no longer needed to ensure thread safety.
                The size of the object code is about 8% smaller for threaded
        + Tst : Threads tests will not fail anymore if resources constraints
                prevent the system from creating all the required threads.

0.46    2011-01-23 16:45 UTC
        + Fix : [RT #64866] : Assertion failure with perl 5.13.9.
                The real problem was that dispell() wasn't properly resetting
                the magical sv flags, which became visible in the test suite
                only with perl 5.13.9.
                Thanks Joshua ben Jore for reporting.

0.45    2010-11-21 23:15 UTC
        This is a maintenance release. The code contains no functional change.
        Users of 0.44 can skip this update.
        + Doc : C++ compilers are officially NOT supported.
        + Doc : The minimum perl 5.10.0 requirement for uvar magic has been
                made more explicit.
                Thanks Peter Rabbitson for pointing this out and contributing a
        + Tst : Tune for perl 5.13.7.
        + Tst : Capture::Tiny will be used in t/17-ctl.t if and only if it can
                capture a simple run.

0.44    2010-09-24 19:10 UTC
        + Fix : Broken linkage on Windows with gcc 3.4, which appears in
                particular when using ActivePerl's default compiler suite.
                For those setups, the Variable::Magic shared library will now
                be linked against the perl dll directly (instead of the import
                library). This (should) fix RT #51483.
                Thanks Christian Walde for helping to reproduce this failure
                and extra testing.
        + Rem : Support for development perls from the 5.11 branch but older
                than the 5.11.0 release was removed. This could cause more
                recent setups to fail.
        + Tst : Threads tests are now only run on perl 5.13.4 and higher.
                They could segfault randomly because of what seems to be an
                internal bug of Perl, which has been addressed in 5.13.4.
                There is also an environment variable that allows you to
                forcefully run those tests, but it should be set only for
                author testing and not for end users.

0.43    2010-06-25 23:35 UTC
        + Add : The new constant VMG_COMPAT_GLOB_GET tells you whether get magic
                is called for globs. It's true starting perl 5.13.2.
        + Chg : All callbacks are now called within an eval-like context.
                Only free callbacks used to be called that way.
        + Fix : Some exceptions thrown from a free callback could be lost.
        + Fix : Croak messages could sometimes be repeated several times.
        + Fix : t/41-clone.t segfaulting with perl 5.13.2.

0.42    2010-05-19 00:15 UTC
        This is a maintenance release. The code contains no functional change.
        Users of 0.41 can skip this update.
        + Fix : Test failures with perl 5.13.
        + Tst : Improve coverage.

0.41    2010-03-15 17:35 UTC
        + Doc : Tweaks and fixups.
                Thanks Shlomi Fish.
        + Fix : Compatibility with the soon-to-be-released perl 5.12.0.
        + Fix : Correctly propagate the errors thrown when variable destruction
                happens at compile-time and not from inside eval STRING.
                Thanks Florian Ragwitz and Ash Berlin for reporting.

0.40    2010-01-06 23:20 UTC
        + Fix : Possible memory miswrites when passing data arguments to cast().
        + Fix : Minor C portability tweaks.

0.39    2009-12-01 00:05 UTC
        + Add : You can use a function name as a callback by passing a string
                reference to wizard() instead of a code reference.
        + Fix : Compatiblity with perl 5.11.1 and 5.11.2.
        + Fix : Scalars stored into the data slot no longer leak.
        + Fix : Thread destruction should not segfault anymore.
        + Opt : As a result of removing the deprecated features, less memory is
                used for both threaded (a pointer table is used instead of a
                hash) and non-threaded (no global structure is needed anymore)
        + Rem : As advertised in the precendent version, all the signature
                related features were removed. This includes the 'sig' option
                to wizard(), the getsig() and gensig() functions, and the SIG_*

0.38    2009-10-04 16:10 UTC
        + Dep : All the signature-related features are DEPRECATED and will be
                removed in december 2009. This includes the 'sig' option to
                wizard(), the getsig() and gensig() functions, and the SIG_*
                Afaik those features were never used in real life, and they make
                the XS code slow and brittle. If you want your wizards to be
                globally available, you'll have to handle that yourself by
                storing them in a hash.
        + Doc : More examples in a new COOKBOOK section.
        + Fix : Compatiblity with the 5.11.0 release. The new compatibility
                constant VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID was added to cover
        + Fix : Work around Kwalitee test misfailures.

0.37    2009-08-25 15:25 UTC
        + Add : The new constant VMG_FORKSAFE can be tested to know whether the
                module will behave nicely when fork()ing. It's currently always
                true except on Windows where you need perl 5.10.1 for it to be
        + Doc : Nits and clarifications.

0.36    2009-07-05 16:30 UTC
        + Chg : getdata() now returns an empty list when no magic is present.
                It used to return undef but did not croak as stated in the doc.
                Thanks Matt S. Trout for pointing this out.
        + Fix : Building and tests with ActiveState Perl 5.8 build >= 822.

0.35    2009-05-15 20:50 UTC
        This is a maintenance release. Users of 0.34 can skip this update.
        + Chg : uvar magic used to be enabled for 5.9.5. It now requires 5.10 or
        + Fix : Silence compilation warnings for cxinc().
        + Rem : The workaround introduced in 0.31 for the "Unknown errors" issue
                was removed, as regression tests show that 0.34 provides a
                better fix.
        + Tst : Skip t/40-threads.t on 5.8.x with old versions of threads and

0.34    2009-04-19 16:55 UTC
        + Fix : Destruction of wizards in require.
        + Fix : "panic: restartop" in 5.10 when dieing at compile time triggers
                a destructor.

0.33    2009-03-26 00:00 UTC
        + Chg : cast() and getsig() now croak too when an invalid signature is
        + Fix : It was possible to generate with gensig() the same signature
                twice before actually defining the wizards.
        + Tst : More stash tests.
        + Tst : Test when the magic takes place in some cases.
        + Tst : Improved coverage for the op object feature.

0.32    2009-03-01 13:45 UTC
        + Chg : dispell() and getdata() now croak when an invalid signature is
        + Doc : More examples and a brand new synopsis.
        + Fix : The signature is no longer stored in the mg_private member of
                the MAGIC struct. This fixes possible clashes with magics from
                other extensions.
        + Fix : op info objects weren't blessed into the right class.
        + Fix : Races when initializing the op names cache under threads.

0.31    2009-02-19 23:50 UTC
        + Doc : A somewhat better introduction. The FUNCTION section was moved
                before CONSTANTS and HISTORY since it's more important. And
                'assignation' is really 'assignment', says Ricardo. :)
        + Fix : The op_info features are now thread safe.
        + Fix : Segfaults that occured when trying to get the op name during
                global destruction.
        + Fix : Segfaults and wrong "Unknown error" exceptions that happened
                when dieing in require caused a free callback to fire.
                Thanks Florian Ragwitz for reporting.

0.30    2009-02-12 17:05 UTC
        + Add : You can now get in all the callbacks either the name or a B::OP
                object representing the current op if you pass the new 'op_info'
                option to wizard() with respective values VMG_OP_INFO_NAME and
        + Doc : Document magic on array/hashes values.
        + Fix : Completely skip free callbacks during global destruction.
        + Tst : Tests now pass again on 5.8.3 and lower (they were broken since
        + Tst : Test magic on symbol table and on array/hash values.

0.29    2009-02-08 11:10 UTC
        + Add : Set $_[2] to the default length for len magic on scalars.
        + Chg : Perl 5.8 is required.
        + Chg : The CLONE method will no longer be defined for non-threaded
        + Doc : Nits.
        + Fix : The logic for turning off the GMAGICAL flag on hashes when no
                uvar magic is involved could do nasty things on tied hashes.
        + Upd : More resources in META.yml.

0.28    2009-01-24 17:05 UTC
        + Add : The 'copy_key' option to wizard(), that enables the safe edition
                of $_[2] in uvar callbacks to redirect actions to another key.
        + Fix : Exception objects thrown from callbacks at compile time were not
                available in $@.
        + Fix : free callbacks triggered during global destruction could lead to
                segfaults because the wizard was already freed.
        + Fix : Refcount of scalars with free callback.
        + Fix : Segfaults when using get or uvar magic simultaneously with clear
        + Doc : The documentation about what the callbacks take and should
                return is now somewhat clearer.

0.27    2009-01-18 23:40 UTC
        + Fix : Offset of 1 with len magic on scalars.
        + Fix : Segfaults that seem to happen when one croak in a callback at
                compile time (thanks Ash Berlin for the testcase).
        + Upd : Resources in META.yml (Florian Ragwitz)
        + Tst : Large cleanup resulting in a wider set of tested behaviours.

0.26    2008-11-29 22:05 UTC
        + Fix : Leaks of cloned coderefs that access lexicals.
        + Fix : Building with maint-5.8 and blead (thanks Andreas Koenig).

0.25    2008-11-12 19:40 UTC
        + Fix : Compatibility with 5.8.9.
        + Fix : Old Pod::Coverage don't ignore CLONE.
        + Upd : META.yml spec updated to 1.4.

0.24    2008-10-12 14:55 UTC
        + Fix : Really fix it.

0.23    2008-10-11 17:25 UTC
        + Fix : Building on perls with multiplicity but not ithreads.

0.22    2008-09-29 19:40 UTC
        + Doc : Explain how magic differs from overloading.
        + Fix : Disable thread safety for perl 5.8 on Windows. If you want it
                enabled, reliable feedback is welcome.

0.21_02 2008-09-28 23:10 UTC
        + Fix : Hide previously deleted magic tokens in vmg_svt_free (Yuval

0.21_01 2008-09-22 13:25 UTC
        + Chg : Shrink the context data.
        + Fix : Enable thread safety features for perls that just lack
        + Tst : Output threads and threads::shared versions in threads tests.

0.20    2008-09-20 23:35 UTC
        + Fix : The module is now thread safe. You can test if it had been
                built with thread safety features enabled through the
                VMG_THREADSAFE constant.
        + Fix : Correct backtrace when wizard() croaks.
        + Fix : 'cast $a, undef' should throw an 'invalid wizard' error instead
                of an 'invalid signature'.

0.19    2008-07-05 15:05 UTC
        + Add : The patchlevel with which the module has been built is now
                exported with the VMG_PERL_PATCHLEVEL constant.
        + Chg : Version checking macros overhaul.
        + Fix : 'uvar' magic should only be enabled in maint-5.10 and higher
                since it's never going to be backported to 5.8.
        + Fix : Likewise, the copy callback API change should only be enabled in
                5.11 and higher.
        + Fix : Instead of those ackward fake refcount increments in the wizard
                destructor, flag the wizard with SVf_BREAK and force temps
                cleanup. This should fix the wizard destruction for all perls,
                and solves the leak introduced by the previous solution.

0.18    2008-07-04 12:20 UTC
        + Fix : Enable uvar magic when patchlevel >= 28419.
        + Fix : Set VMG_COMPAT_ARRAY_PUSH_NOLEN for Windows ActiveState Perl

0.17    2008-05-11 09:05 UTC
        + Fix : 5.8.4 and lower don't have mPUSHi. Gah. Yeah, I know, I should
                use Devel::PPPort.

0.16    2008-05-10 22:05 UTC
        + Add : The samples/ script.
        + Chg : The sv_magical() + vmg_mg_magical() combo was simplified into
        + Tst : t/33-code.t was testing scalars, not code.
        + Tst : is() and like() are better than ok().
        + Tst : 100% coverage reached.

0.15    2008-04-11 18:25 UTC
        + Chg : Factor vmg_cb_call{1,2,3}() into one function.
        + Fix : len magic is no longer called when taking the length() of a
                magical scalar since p32969. The VMG_COMPAT_SCALAR_LENGTH_NOLEN
                constant was added to cover this.
        + Tst : More tests for t/22-len.t.

0.14    2008-03-24 12:35 UTC
        + Fix : t/16-huf.t failures on Solaris and FreeBSD caused by not
                updating mg->mg_ptr after Renew-ing it on dispell.
        + Fix : Undefining MGf_DUP caused the wizard's magic to be wrongly
                initialized. MGf_DUP now appears as true from the user point of
                view, but the dup callback isn't actually set.
        + Fix : Warnings with blead due to copy callbacks now taking an I32 (API
                change #33256).
        + Fix : vmg_svt_val() and vmg_uvar_del() aren't required if no uvar
                magic is available.
        + Tst : Tests now output the version of optional modules loaded.

0.13    2008-03-19 14:35 UTC
        + Doc : Link to coverage report.
        + Fix : Correct dependencies listing in META.yml.
        + Tst : Improved test coverage.
        + Tst : Print the patchlevel as a comment.
        + Tst : Use is() where it's relevant.
        + Tst : t/16-huf.t now really tests interaction with H::U::FH.

0.12    2008-02-07 18:15 UTC
        + Fix : POD error. Thanks to Chris Williams (BinGOs) for the quick

0.11    2008-02-07 17:55 UTC
        + Add : Copy callbacks now receive the current key/index in $_[2].
                The current value/element is now in $_[3].
        + Chg : The trigger of copy magic on list assignment with perls greater
                than 5.10.0 was caused by uvar magic. Hence,
                VMG_COMPAT_HASH_LISTASSIGN_COPY was removed. Use VMG_UVAR
        + Fix : Build failures on patched perls.
        + Tst : Added missing exported symbols to 01-import.t.

0.10    2008-02-04 11:30 UTC
        + Add : New script : samples/, that benchmarks our uvar
                magic versus tied hashes.
        + Add : The VMG_COMPAT_* constants can be used from userspace to check
                perl magic abilities.
        + Fix : Callbacks that returned undef made us croak, breaking the
                variable behaviour (regression test in 14-callbacks.t).
        + Fix : uvar callbacks weren't tested for non-NULL-ity before being
                called (regression test in 28-uvar.t).
        + Tst : Fix typo in 25-copy.t that prevented Tie::Hash tests to be ran.

0.09    2008-02-02 11:30 UTC
        + Doc : Explicitely say that uvar callbacks are safely ignored for
        + Doc : Document caveats and fix the usual set of typos.
        + Fix : vmg_dispell() didn't check if the ext magic were ours when
                counting wizards that have uvar callbacks, resulting in a
                possible memory misread.
        + Fix : getdata() now returns directly the data object, and no longer a
                copy. This caused a leak.
        + Tst : Prefix author tests by 9*-.
        + Tst : New optional author test : 95-portability-files.t, that uses
                Test::Portability::Files when it's present.
        + Tst : New test : 14-self.t, that tests application of magic on the
                wizard itself.
        + Tst : Move Hash::Util::FieldHash tests out of 11-multiple.t to

0.08    2008-02-01 16:55 UTC
        + Add : copy magic for tied arrays/hashes.
        + Add : local magic.
        + Add : uvar magics : fetch, store, exists, delete for hashes.

0.07_*  2008-01
        Internal development versions.

0.06    2007-11-20 10:10 UTC
        + Chg : 5.7.3 is now officially required.
        + Fix : "data" test failures on 5.8.{0,2}.
        + Fix : Drand01() vs rand().

0.05    2007-11-19 09:10 UTC
        + Fix : 5.10.0_RC1 compatibility fix.

0.04    2007-08-28 12:25 UTC
        + Chg : s/require (XSLoader)/use $1/.
        + Fix : Tests are now strict.
        + Fix : Complete dependencies.

0.03    2007-08-01 17:20 UTC
        + Add : Passing the signature of an already defined magic to wizard()
                now returns the corresponding magic object.
        + Add : You can pass the numeric signature as the wizard argument of
                cast(), dispell() and getdata().
        + Add : Any argument specified after the wizard (or the signature) in a
                call to cast() is now passed to the private data constructor in
                $_[1] and after.
        + Chg : $_[0] is now always a reference to the magic variable in all
                callbacks. The reason for changing from the previous behaviour
                is that one may want to apply the same magic to a plain scalar
                and to a scalar reference, and needs a way to distinguish
                between them in the callback (say, ref()).
        + Fix : Wizard object destruction used not to free the signature.

0.02    2007-07-27 13:50 UTC
        + Fix : In response to test report 548152 :
                Newx() and SvMAGIC_set() not present on older perls.
        + Fix : In response to test report 548275 :
                Since perl 5.9.5, 'clear' magic is invoked when an array is
                undefined (bug #43357). Moreover, 'len' magic is no longer
                called by pushing an element since perl 5.9.3.
        + Fix : Missing glob test in MANIFEST.

0.01    2007-07-25 16:15 UTC
        First version, released on an unsuspecting world.