Uim on Qt5

[NgoHuy]

I built uim-1.8.5 on Qt5 successfully ( I merged code qt5 from master branch )

But when I typed on tea , it's segmentation fault . This bug seem to be libxcb error.

I debug

#0  0xb7227a58 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#1  0xb7fc42c3 in sendEvent (event=0xbfffed10, receiver=<optimized out>) at /usr/include/qt/QtCore/qcoreapplication.h:203

#2  QUimPlatformInputContext::commitString (this=this@entry=0x81441f8, str=...) at quimplatforminputcontext.cpp:601
#3  0xb7fc53ac in QUimPlatformInputContext::updatePreedit (this=this@entry=0x81441f8) at quimplatforminputcontext.cpp:637
#4  0xb7fc56ef in QUimPlatformInputContext::update_cb (ptr=0x81441f8) at quimplatforminputcontext.cpp:531
#5  0xb409b9b7 in im_update_preedit (uc_=0xb4049800) at uim-func.c:130
#6  0xb4077d4a in call (proc=<optimized out>, args=30, eval_state=eval_state@entry=0xbfffee94, need_eval=<optimized out>, 
    need_eval@entry=SCM_VALTYPE_NEED_EVAL) at ../sigscheme/src/eval.c:415
#7  0xb4078009 in scm_eval (obj=<optimized out>, env=<optimized out>, env@entry=135413328) at ../sigscheme/src/eval.c:499
#8  0xb40826fb in scm_s_letstar (bindings=30, body=3020254584, eval_state=0xbfffef74) at ../sigscheme/src/syntax.c:611
#9  0xb4077d1e in call (proc=<optimized out>, args=3020254584, eval_state=eval_state@entry=0xbfffef74, need_eval=<optimized out>, 
    need_eval@entry=SCM_VALTYPE_NEED_EVAL) at ../sigscheme/src/eval.c:420
#10 0xb4078009 in scm_eval (obj=<optimized out>, env=<optimized out>) at ../sigscheme/src/eval.c:499
#11 0xb40786c1 in scm_call (proc=<optimized out>, args=<optimized out>) at ../sigscheme/src/eval.c:94
#12 0xb7fbaa2c in GCROOTS_call_with_gc_ready_stack (ctx=0x8107658, proc=proc@entry=0xb4086c70 <uim_scm_callf_internal>, 
    arg=arg@entry=0xbffff02c) at gcroots.c:114
#13 0xb4085f5d in scm_call_with_gc_ready_stack (arg=0xbffff02c, arg@entry=0xbfffefec, 
    func=func@entry=0xb4086c70 <uim_scm_callf_internal>) at ../sigscheme/src/storage-gc.c:376
#14 uim_scm_call_with_gc_ready_stack (func=func@entry=0xb4086c70 <uim_scm_callf_internal>, arg=arg@entry=0xbffff02c)
    at uim-scm-sigscheme.c:458
#15 0xb4086eb5 in uim_scm_callf (proc=proc@entry=0xb40a0e22 "focus-out-handler", args_fmt=args_fmt@entry=0xb40a1bbc "p")
    at uim-scm-sigscheme.c:1010
#16 0xb4099c70 in uim_focus_out_context (uc=0x8ac95c0) at uim.c:320
#17 0xb7fc3970 in QUimPlatformInputContext::unsetFocus (this=0x81441f8) at quimplatforminputcontext.cpp:189
#18 0xb74d1c12 in QGuiApplicationPrivate::_q_updateFocusObject(QObject*) () from /usr/lib/libQt5Gui.so.5
#19 0xb74d1e19 in QGuiApplicationPrivate::processActivatedEvent(QWindowSystemInterfacePrivate::ActivatedWindowEvent*) ()
   from /usr/lib/libQt5Gui.so.5
#20 0xb74d1f60 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) ()
   from /usr/lib/libQt5Gui.so.5
#21 0xb74bc236 in QWindowSystemInterface::sendWindowSystemEventsImplementation(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at uim-scm-sigscheme.c:458
#15 0xb4086eb5 in uim_scm_callf (proc=proc@entry=0xb40a0e22 "focus-out-handler", args_fmt=args_fmt@entry=0xb40a1bbc "p")
    at uim-scm-sigscheme.c:1010
#16 0xb4099c70 in uim_focus_out_context (uc=0x8ac95c0) at uim.c:320
#17 0xb7fc3970 in QUimPlatformInputContext::unsetFocus (this=0x81441f8) at quimplatforminputcontext.cpp:189
#18 0xb74d1c12 in QGuiApplicationPrivate::_q_updateFocusObject(QObject*) () from /usr/lib/libQt5Gui.so.5
#19 0xb74d1e19 in QGuiApplicationPrivate::processActivatedEvent(QWindowSystemInterfacePrivate::ActivatedWindowEvent*) ()
   from /usr/lib/libQt5Gui.so.5
#20 0xb74d1f60 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) ()
   from /usr/lib/libQt5Gui.so.5
#21 0xb74bc236 in QWindowSystemInterface::sendWindowSystemEventsImplementation(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Gui.so.5
#22 0xb74bc2bf in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Gui.so.5
#23 0xb4b63a81 in ?? () from /usr/lib/qt/plugins/platforms/libqxcb.so
#24 0xb6c7e10e in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#25 0xb6c7e4b8 in ?? () from /usr/lib/libglib-2.0.so.0
#26 0xb6c7e578 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#27 0xb727224d in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#28 0xb4b63c86 in ?? () from /usr/lib/qt/plugins/platforms/libqxcb.so
#29 0xb72262f6 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#30 0xb7226704 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#31 0xb722bfc6 in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#32 0xb74c89a4 in QGuiApplication::exec() () from /usr/lib/libQt5Gui.so.5
#33 0xb7a23974 in QApplication::exec() () from /usr/lib/libQt5Widgets.so.5
#34 0x0805bd12 in ?? ()
#35 0xb6dba7c3 in __libc_start_main () from /usr/lib/libc.so.6
#36 0x0805c1f1 in ?? () 

[icy]

@NgoHuy please let the team know what you did

[NgoHuy]

I found that file qt5 / immodule / quimplatforminputcontext.cpp line 541 and 551
caused segmentation fault

ic->proxy->candidateActivate(nr, displayLimit);
ic->proxy->candidateSelect(index);

But I can not detect memory leak (ate a lot of my memory) when I use uim and tea (qt5 app)

[NgoHuy]

I debugged and found that many uim-candwin-qt5 processes's running, it ate a lot of my ram

[mnogu]

I debugged and found that many uim-candwin-qt5 processes's running, it ate a lot of my ram

The implementation of the Qt5 immodule is not finished and the Qt5 immodule is still buggy as you see.

[NgoHuy]

My workaround temporarily disable uim-candwin-qt5, it works fine

void CandidateWindowProxy::initializeProcess()
{
    if (process->state() != QProcess::NotRunning) {
        //return;
        process->close();
    }
    process->close();

#if QT_VERSION < 0x050000
    process->start(UIM_LIBEXECDIR "/uim-candwin-qt4", QStringList() << style);
#else
    process->start(UIM_LIBEXECDIR "/uim-candwin-qt5", QStringList() << style);
#endif
    process->close();

[NaofumiHonda]

I don't know the current status on this issue.
Anyway the attached patch makes uim work well with uim-candwin-qt5.
The reason of the issue is that: the uim-candwin-qt5 also load the uim-plugin,
and the loaded plugin again executes uim-candwin-qt5, which causes
infinite loops! So it suffices to block this recursive execution.

patch.zip

[dai-vdr]

@NaofumiHonda thank you for your patch!
I confirm it works well now. After more testing, I will merge this.

[dai-vdr]

this fixes #72

[dai-vdr]

Let's close this issue now. Please open new issue if you encounter some bug related Qt5.

[NaofumiHonda]

I found that the current commitment is based on an older version of my patch
where I replaced patch.zip one day later after the initial post.
So please apply the following additional patch also, otherwise not only uim-candwin-qt5 but also
all the programs invoked from a qt5 program (for example, a qt5 base terminal emulator)
are blocked to load the uim plugin.

addtional.zip

[dai-vdr]

thank you, i applied it.