Commit Graph

15254 Commits

Author SHA1 Message Date
Kamil Trzcinski
48ba0389ee qmake: added VCPROJ_ARCH variable.
It's a generic way to configure the Visual Studio Solution
architecture. It's added to support different project
architectures, ARM specifically. It may be a good idea
to replace the Win32 and x64 with VCPROJ_ARCH=Win32
and VCPROJ_ARCH=x64 defined in corresponding qmakespecs.

Change-Id: I9b23f7393bf248a629c425187d6dd8859092c45c
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
2013-09-15 16:14:28 +02:00
Kamil Trzcinski
036cfadcc6 qmake: added WinRT and WinPhone configuration switch
qmakespec for either WinRT or WinPhone have to specify
QMAKE_PLATFORM with winrt and/or winphone.

Change-Id: I87e0063881e6edd65de14adb006949247ce49904
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
2013-09-15 16:13:59 +02:00
Oliver Wolff
fee7420a73 Fixed sqlite build for WinRT
Change-Id: Idf5bfa8b55e8d7db46207e55de1e9176def503a6
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
2013-09-15 16:13:49 +02:00
Andrew Knight
ede5be6ea0 Create clean makefiles for winrt builds
Change-Id: I33b74b98e04c1a9ca15ae07fad88f88dd4ce0669
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
2013-09-15 13:25:25 +02:00
Nicolás Alvarez
c40a48af99 QtDBus: fix build on MSVC2008 Debug mode.
Normally, searching for a V in a container of T using std::lower_bound
only needs an operator<(T,V). But in MSVC2008 debug mode, STL algorithms
perform some extra checks, such as ensuring the range passed to
std::lower_bound is sorted. This adds a requirement for operator<(T,T)
and operator<(V,T).

QtDBus didn't compile on MSVC2008+Debug since 1e37d854 (Sept 2012!)
because it missed those operator overloads for some private types.

Task-number: QTBUG-33473
Change-Id: I18902d86e6c58349eb7ba3601dc383ad5431c460
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2013-09-15 01:35:33 +02:00
Giuseppe D'Angelo
f4cc344e01 Revert "Reimplement qBinaryFind in terms of std::lower_bound"
After a bit of discussion, we should actually deprecate qBinaryFind too.
This puts the old code back (to avoid behavior changes / source
breaks).

This reverts commit 23d7f6ee5d.

Task-number: QTBUG-33473

Change-Id: I7f7d25171e14061e51543c501c30a7b6b184a8fd
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
2013-09-14 23:43:00 +02:00
Marc Mutz
c8411a0281 tst_qurlinternal: fix a use of memcpy on overlapping memory
The old code smply copied 100 shorts from the pointer passed into the
ushortarray ctor, regardless of the actual bounds of the original array.

Fix by making the ctor take the array by deference, deducing the size
as a template parameter, and only copying that much.

Fixes asan trace:
==18660==ERROR: AddressSanitizer: memcpy-param-overlap: memory ranges [0x7fff3c56de00,0x7fff3c56dec8) and [0x7fff3c56dd60, 0x7fff3c56de28) overlap
    #0 0x457161 in memcpy asan_interceptors.cc:330
    #1 0x4c40fe in ushortarray::ushortarray(unsigned short*) qtbase/tests/auto/corelib/io/qurlinternal/tst_qurlinternal.cpp:62
    #2 0x4b0437 in ushortarray::ushortarray(unsigned short*) qtbase/tests/auto/corelib/io/qurlinternal/tst_qurlinternal.cpp:63
    #3 0x47b643 in tst_QUrlInternal::idna_testsuite_data() qtbase/tests/auto/corelib/io/qurlinternal/tst_qurlinternal.cpp:119
    ...

Change-Id: Ie497bc8d337bc680a562482ca71ace535797ffb3
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2013-09-14 23:41:06 +02:00
Marc Mutz
95b62e5a71 tst_QSettings: add missing () around a macro argument use
'val' was set to
   QList<...>() << ... << ...
further down.

Fixes a Clang warning.

Change-Id: I5fe80d87dbe2c1d50652dfd7b6c5f4a9198cd467
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2013-09-14 23:40:53 +02:00
Marc Mutz
831e314fc3 examples: fix if (!foo == 0)
Clang issues a warning for this.

Change-Id: I1b9741d0260d43f864e404c693b5a459c5038b67
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
2013-09-14 23:40:31 +02:00
Marc Mutz
51cffbdcb7 examples: remove unused static const variables
They cause warnings on Clang.

Change-Id: If599303f4a00c2a24f0a7c369299f3ea6fe7fc91
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
2013-09-14 23:40:18 +02:00
Olivier Goffart
7d7e8ae3fa Use Q_STATIC_ASSERT to report error about missing Q_OBJECT
Q_STATIC_ASSERT gives better error with C++11 enabled.

Aslo the qt_check_for_QOBJECT_macro had warning on some compiler since
it used null reference

Change-Id: Ic6115da800064b00c50a5762f0b79f5f656bf750
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2013-09-14 20:33:29 +02:00
Thiago Macieira
6b9d125621 Do 64-bit loops in QBitArray::count(bool)
On 64-bit platforms, with unaligned loads, this is defintely an
improvement since we can run fewer instructions. On 32-bit platforms
with unaligned loads, we'll do the exact same number of loads. On
platforms without unaligned loads, it's no worse.

Change-Id: Idd5dd5213975d77bbc3adf486adbf6f8ef071341
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
2013-09-14 20:33:29 +02:00
Thiago Macieira
6f0fdaa76c Let the compiler do the unaligned loads in QBitArray::count(bool)
For platforms where the CPU can do unaligned loads on its own, like
x86, the compiler will generate actual loads. On other CPUs, it will
do the byte-by-byte load like we were doing. The compiler cannot
generate worse code than our hand-rolled load, so this change can only
improve performance.

Change-Id: I32a89e64aa64d8af504be6c5a10b04d7573cdb98
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
2013-09-14 20:33:29 +02:00
John Layt
6c3a9df3fe QDateTime - Store Qt::TimeSpec, remove Daylight Status
Change storing the spec from QDateTimePrivate::Spec to Qt::TimeSpec.

Remove the storage and use of the Daylight Status as it is almost
never set or used, and would be inaccurate if the tz were to change.
It will be replaced later with proper daylight transition support.

This simplifies the code and makes the msecs storage change easier.

Change-Id: I78a70905025d7eddf1c2dc6001f6b490e5a2b3b8
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2013-09-14 18:31:00 +02:00
John Layt
e76c312eb8 QDateTime - Switch to using msecs based functions
A number of QDateTime functions directly use or modify the data stored
in the private, but future changes to store msecs and status make this
maintenance more complicated.  Where possible simplify this code to use
the standard msecs functions, standard constructors, or public api
instead.  This greatly simplifies the functions and the following msecs
storage code changes.

This is an intermim step towards storing the time in msecs.  Some
functions will be slower as a result of this change, optimization
will take place after all the msecs changes are completed.

Note this also removes a test that used valid QDates outside the range
of msecs, this change in behavior will be documented in the final
mscs change.

Change-Id: I6ef710f24babc7024091010064082e9be0b5bbfe
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2013-09-14 18:31:00 +02:00
Andrew Knight
f6e6dde369 winmain for winrt
WinRT passes the executable and Appx server info to the CRT main, and
supports several additional activation arguments as well. This handles the
arguments passed to main as well as the case where a modern app is
launched from an external application (e.g. Qt Creator).


Task-number: QTBUG-30198
Change-Id: Ia843e98c7843d5705f5f6d1c809de0b6bcdb5d26
Done-with: Kamil Trzcinski
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>
2013-09-14 15:42:24 +02:00
Giuseppe D'Angelo
384ca58e33 Remove qSort usages from qtbase examples
QtAlgorithms is getting deprecated,
see http://www.mail-archive.com/development@qt-project.org/msg01603.html

Change-Id: I68dec0cb6efa1f164ba9f1671b55332ee4ad2e23
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
2013-09-14 13:12:40 +02:00
John Layt
3a8b8edd01 QDateTime - Add test case for Daylight Time Transitions
Test the Daylight Time transitions.  QDateTime does not correctly deal
with many of these scenarios so those tests are marked as QEXPECTFAIL.
These bugs will be progressively addressed in coming commits.

Change-Id: I01eba9d6143a792f081542cb198e221efcf28e98
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
2013-09-14 11:38:15 +02:00
Oliver Wolff
6afbb46264 build system support for WinRT
Done-With: Andrew Knight
Done-With: Oswald Buddenhagen

Change-Id: Ief4e921072a03229bb342480a85024a1fc09fa56
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
2013-09-14 09:51:14 +02:00
Konstantin Ritt
0adc96c1c4 Drop leftovers after 02651060b6
Change-Id: I011359a47ed47308a7d25e306fbf45a83a3a5715
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
2013-09-14 08:06:46 +02:00
John Brooks
6827728d5a Fix loss of valid dbus objects after unregisterObject
Partial revert of 3c6bb0ed8b and
57aed703d2.

When registering an object that was previously unregistered but not yet
garbage collected, the activeChildren count on the parent node was not
incremented, which could result in other registered objects disappearing
after a later unregisterObject.

Copying objects in the tree is not free, but it's not expensive enough
or used frequently enough to justify that error-prone logic. It's much
safer to simply remove objects immediately.

Change-Id: I3dc59c2ebd07b237518424fcd8ea7371a22d6d15
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2013-09-14 06:58:24 +02:00
Konstantin Ritt
3e025708b4 Fix build with -Werror
The actual warning is:
src/gui/text/qharfbuzzng.cpp:589:67: error: cast from ‘void*’ \
to ‘uint {aka unsigned int}’ loses precision [-fpermissive]

Change-Id: I75cc7bad2147cd5e5e7c17bc22fe613280e86755
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2013-09-14 05:17:07 +02:00
Thiago Macieira
504a644862 ICC 13.0 supports atomics
See http://software.intel.com/en-us/articles/c0x-features-supported-by-intel-c-compiler

Change-Id: I45ba6aa640f82df4d06fd4412264892bfd58ffc3
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>
2013-09-14 03:20:25 +02:00
Thiago Macieira
bad6f54c0b Update ICC warnings disabled by default.
Warnings 654 and 411 appear to have disappeared by ICC 14.

Change-Id: Ic200f239a4a4377015d13b2f4ae85595ce864ace
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>
2013-09-14 03:20:25 +02:00
Thiago Macieira
cc74159702 Base64: Implement the "base64url" encoding and the stripping of '='
The "base64url" encoding is defined in RFC 4648, which is the newest
version of Base64. There are also a few situations where the ending
'=' is not desired.

Change-Id: I9bb9fa55817b57d125189e4e795d6fde97caea6d
Reviewed-by: Richard J. Moore <rich@kde.org>
2013-09-14 03:20:25 +02:00
Thiago Macieira
3154e1ccaa Whitespace: re-indent the {to,from}Base64 functions
The code must have been copied from somewhere, a sample
implementation.

Change-Id: Ieb6ac5d69824fe8a3f38710a22beb79ac986e182
Reviewed-by: Richard J. Moore <rich@kde.org>
2013-09-14 03:20:25 +02:00
Thiago Macieira
131b3e5dca QStandardPaths: add a test that just dumps the values
Change-Id: I79bcc1974988b3d712a40e89a3ec4aeb7be1fb5e
Reviewed-by: Alan Alpert (Personal) <416365416c@gmail.com>
2013-09-14 03:20:25 +02:00
Sze Howe Koh
2171b057e3 Doc: Remove section about how to start threads
- Incomplete: It doesn't talk about how to use a raw QThread, or
  QRunnable, or Qt Concurrent.
- Redundant: Its contents are already presented in QThread's class ref,
  and the line before this section links to the "Multithreading
  Technologies in Qt" overview page which provides a more complete intro

Also remove snippet markers that are no longer used.

Change-Id: I89b7bd72f10c8ffdfd9b7772e2493050aafc9c88
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2013-09-14 02:58:57 +02:00
Sze Howe Koh
6780f76ee0 Doc: Remove page about how to start QThreads
Multiple issues:
- Incomplete: It doesn't talk about instantiating a raw QThread
- Redundant: Its contents are already presented in QThread's class ref
- Incorrect: It is legal to create a QThread before a QCoreApplication
- Irrelevant: The bit about QCoreApplication::exec() and the etymology
  of "GUI thread" is unrelated to the topic of starting threads

Also remove snippets that are no longer used

Change-Id: Ice1819845b5b2cf843719edaa7b0f4bbb1e8bd97
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2013-09-14 02:58:26 +02:00
Sze Howe Koh
5852ddb110 Doc: Move multithreading guidelines to the overview page
It's helpful to see how to choose among different solutions, right
after seeing short descriptions of all the solutions.

- Some minor rewording was done during the move
- The example about polling ports in a new thread was removed because
  there are better ways to do that without threads.

Change-Id: I2cb571a4dbf9be93fb0ec88c60fb7406996c345b
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2013-09-14 02:58:12 +02:00
Sze Howe Koh
cddd16c2d5 Doc: Add an overview page to compare multithreading techniques
Change-Id: I75e67ecb96423a3ebd82b32e6855378a73463fb7
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2013-09-14 02:57:43 +02:00
Sze Howe Koh
7c6b170198 Doc: Fix copy+paste errors in the QString class ref
Also bring text closer to the style guide at
http://qt-project.org/wiki/CppDocumentationStyle

Change-Id: I30b1c36ac125a10c002efeb36978ced0d7a8f8bf
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
2013-09-14 02:57:16 +02:00
Sergio Ahumada
415f65fbff Merge "Merge branch 'stable' into dev" into refs/staging/dev 2013-09-14 01:11:43 +02:00
Thorbjørn Martsum
62fbf3ca6f QMessageBox - move margins to a left spacer
This patch moves labels indent and contents margins into a
left spacer, and it only puts the iconLabel in the layout
if there is an icon.

Change-Id: I6f3563a08fc15ec6ec267e095adf1734f7828355
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>
2013-09-13 22:06:26 +02:00
John Layt
92b0a7fa3e QTime - Add public api for get/set msecs since start of day
Add new public api to get and set the number of msecs since the start
of the day.  Modify QDateTime to use the new msecs api.

[ChangeLog][QtCore][QTime] Added new methods fromMSecsSinceStartOfDay()
to create a new QTime from an msecs value, and msecsSinceStartOfDay()
to return the QTime as the number of msecs since the start of the day.

Change-Id: I285b725b883f1f5524fda87ca81bd64ed99fe6f4
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
2013-09-13 22:06:26 +02:00
Tor Arne Vestbø
3e3297242a Xcode: Resolve extra compiler (e.g qrc) dependencies
The Xcode generator relies on the generic makefile generator for extra
compilers such as qrc and moc, by generating makefiles that are then
executed as separate build steps in the Xcode build.

These makefiles are generated by entering a special mode in the Xcode
generator, in which case we _do_ want to resolve dependencies, so that
e.g. the files referenced inside a qrc file are added as dependencies
to the makefile rule that generates the qrc-cpp file.

Change-Id: I96bdcb165e9774a6328ae1980986fa2c6b00c6d9
Reviewed-by: Andy Shaw <andy.shaw@digia.com>
2013-09-13 21:43:38 +02:00
hjk
63a382a930 Add a static QFileInfo::exists(fileName) function
This avoids dynamic construction of the private class. According to
the benchmark we go from 4,550 to 3,900 instruction reads per iteration.
(without change 32629676 the baseline is 5,600)

Change-Id: I5df925e30dbd49bdde87173e481820574ce5abe1
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2013-09-13 19:37:51 +02:00
hjk
4c709fb391 Add a note on symlink behavior of QFile::exists
Change-Id: I41ede0536f1b7093a7cde3d74a5e221df413aeea
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2013-09-13 19:37:14 +02:00
Chris Meyer
e19e1aae69 Revert recent attempt to fix Invalid Drawable error on Mac.
This reverts commit 59fd36bb914cae248d3c5100dd734d6d90a58dca,
which caused other drawing problems.

Change-Id: I3bb75fd3ca1cd21ffbb9ef5474266f4cd615a64a
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
2013-09-13 19:26:12 +02:00
Thiago Macieira
aef44c7970 Don't use an extension to the C++ language in public headers
According to Clang 3.3, this is an extension:
qpalette.h:178:9: error: anonymous types declared in an anonymous union are an extension [-Werror,-Wnested-anon-types]
qsizepolicy.h:148:9: error: anonymous types declared in an anonymous union are an extension [-Werror,-Wnested-anon-types]

If you try to simply give the struct a name, it complains with:
qpalette.h:178:16: error: types cannot be declared in an anonymous union

Change-Id: I61c69b8e42a1f4c4a15a0733f2d7efa0b3e44864
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
2013-09-13 19:12:09 +02:00
Thiago Macieira
c1c715f800 Optimize QBitArray::count(bool)
Ever since 76e0223619, qPopulationCount
was extracted from QBitArray and moved elsewhere. That unfortunately
meant that the 24-bit loads are completely useless, since
qPopulationCount always operates on 32 bits.

Instead, do a full loop on 32-bit and then do 16-bit and finally 8-bit
(for which there are qPopulationCount overloads).

Change-Id: If945609f075095257d12877c39434909ac190e54
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
2013-09-13 19:11:48 +02:00
Thiago Macieira
d7e424ee66 Remove unused QPF font engine support.
QWS is gone.

Change-Id: Ic04c4dcfff51522dd538bf2cb198dc2e02fe7572
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>
Reviewed-by: Peter Kümmel <syntheticpp@gmx.net>
2013-09-13 19:10:31 +02:00
Paul Olav Tvete
07538de8b1 Make nativeOrientation available in the public API
The QtSensors module defines the coordinate system relative to
QPlatformScreen::nativeOrientation(). However, that is not part
of the public Qt API.

Task-number: QTBUG-32144

Change-Id: I6941c5b8589219064749f18880775b803f23fbbd
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
2013-09-13 19:08:27 +02:00
Sergio Ahumada
f7837e28b5 Merge branch 'stable' into dev
Conflicts:
	src/concurrent/qtconcurrentmedian.h
	src/corelib/itemmodels/qabstractitemmodel.cpp

Change-Id: Iac46a90bbb2958cef7670031a4b59c3becd8538a
2013-09-13 18:04:17 +02:00
Laszlo Agocs
52e38509c6 Fix QWindow::moveEvent documentation
It handles window movement events, not mouse move events.

Change-Id: Ibc8fd0272756fcf87dfac210addbf2f87cfb39d5
Reviewed-by: aavit <eirik.aavitsland@digia.com>
2013-09-13 16:54:35 +02:00
Giuseppe D'Angelo
549c3248ec Remove qFill usages from uic
QtAlgorithms is getting deprecated,
see http://www.mail-archive.com/development@qt-project.org/msg01603.html

Change-Id: I58d0c78609381b20ffe8a68e36c8216689362ed5
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
2013-09-13 16:53:14 +02:00
Stephen Kelly
8b0624182b MetaType: Fix operator{+,-}(int) with the type-erased const_iterators.
Make sure we don't modify the lhs. Instead copy it and advance the
copy.

Change-Id: I3440e8e175bfc299f8f83b816faca54fa3f79e43
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
2013-09-13 14:37:41 +02:00
Stephen Kelly
a9770c4b6c Remove some unneeded constructors.
Change-Id: I34f86960dc0cfaada509957bca5466b2765e8239
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
2013-09-13 14:37:32 +02:00
Martin Smith
93d7ee0da3 qdoc: Eliminate duplicate page warnings in some cases
Prevent qdoc from reporting duplicate pages for external pages with
the same URL and title.

Task-number: QTBUG-33462
Change-Id: Idabdb241aaa4fe105f7b3ea78229ff1ae8776ecf
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
2013-09-13 14:09:56 +02:00
Tor Arne Vestbø
59601e06d9 iOS: Interleave Qt application main() with iOS startup sequence
Our previous event loop integration had two unfortunate flaws:

  1. We would call qt_user_main() from a timer, after returning from
     didFinishLaunchingWithOptions. This had the effect of showing the
     iOS application window long before the Qt application UI had been
     set up, resulting in a 1-2 second flash of black/pink between the
     launch image disappearing and the actual application showing.

  2. We spun a nested event loop, where our implementation of the
     different event loop modes did not perfectly match the Apple
     implementation. This resulted in scrolling being busted in
     some cases such as when showing the virtual keyboard for
     Emoji characters.

These two issues have now been solved by calling the user's main()
from didFinishLaunchingWithOptions. Normally this would not work, as
the user's main would call QApplication::exec() at the end of their
main(), which would block and we would never return back from the
didFinishLaunchingWithOptions callback, resulting in no UI on screen.

We work around this by longjmp'ing out of QApplication::exec(), back
into didFinishLaunchingWithOptions, so that it can return. Again,
this would normally not work, as the call stack where QApplication
and friends would live would get smashed as the application
continued executing. We work around this by allocating a block
of stack space at the start of main(), which we then redirect the
stack pointer to before calling the user's main. This results in
the whole stack of the user's main() and below being preserved, even
if we longjmp out of the call stack (which then restores the
stack pointer).

This approach should work fine together with garbage-collection as
well, since the mark-and-sweep phase will walk the stack from the
stack pointer to the stack base, including sections of the stack
that were part of qt_user_main() and live in the reserved area.
One case where GC will fail though is if it happens as part of the
qt_user_main() call, where the GC will not mark anything in the
'real' callstack below UIApplicationMain(), but this is not
expected to happen.

The size of the reserved stack can be controlled through the
Info.plist key 'QtRunLoopIntegrationStackSize', as well as the
'QtRunLoopIntegrationDisableSeparateStack' key to disable the
separate stack approach completely. This will fall back to the
old approach. The amount of stack space used by the user's
main can be determined by enabling a special debugging mode,
using the 'QtRunLoopIntegrationDebugStackUsage' key.

Change-Id: I2af7a6cfe1a006a80fd220ed83d8a66d4c45b523
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
2013-09-13 14:08:44 +02:00