We can use the D-Bus / systemd machine-id file (which is a UUID without
the dashes) on systems with D-Bus. On Windows, there's a value in the
registry that is filled when Windows is installed, like on Linux. For
BSD systems, the kernel has a UUID we can use too, so extract that.
Task-number: QTBUG-63425
Change-Id: I27eaacb532114dd188c4ffff13d32f2e3c1d74bb
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
ultrix and reliant have not seen a release since 1995. dgux not since
2001. bsdi not since 2003. irix not since 2006. osf not since 2010.
dynix... unclear, but no later than 2002. symbian needs no mention.
All considered obsolete, all gone.
sco and unixware are effectively obsolete. Remove them until someone
expresses a real need.
Change-Id: Ia3d9d370016adce9213ae5ad0ef965ef8de2a3ff
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This warning used to be part of -Wconversion, but that generates too
more noise than we're willing to fix now (like conversion from qint64 to
int). The float conversion does trigger for conversion from double to
float, as shown in all the QVectorND uses of float, but more
importantly, it triggers on passing floats to ints.
Change-Id: I69f37f9304f24709a823fffd14e69cfd33f75988
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Right now,this does really nothing. This commit is just to allow us to
transition the other modules (besides qtbase) to use the syntax that
will become the API.
I've marked three places to use the system CSPRNG:
1) the QHash seed
2) QUuid
3) QAuthenticator
I didn't think the HTTP multipart boundary needed to be
cryptographically safe, so I changed that one to the global generator.
Change-Id: Ib17dde1a1dbb49a7bba8fffd14ecf1938bd8ff61
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
I'll need it in the AF_NETLINK implementation of QNetworkInterface.
Change-Id: Icaa86fc7b54d4b368c0efffd14ef5ce895d0ed5b
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
"global/qrandom.cpp", line 155: error #2000-D: attribute "destructor" is not implemented and will be ignored
Task-number: QTBUG-63948
Change-Id: Icaa86fc7b54d4b368c0efffd14efa35381d4e797
Reviewed-by: Liang Qi <liang.qi@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
The previous version was good, just not optimal. Because the input was
an unsigned 64-bit number, compilers needed to generate extra code to
deal with HW instructions that only convert 64-bit signed input. And
that was useless because a double uniformly distributed from 0 to 1 can
only have 53 bits of randomness.
The previous implementation did exactly what the Microsoft libstdc++ and
libc++ implementations do. In my opinion, those implementations have an
imperfect distribution, which is corrected in this commit. In those, all
random input bigger than 0x20000000000000 has a different frequency
compared to input below that mark. For example, both 0x20000000000000
and 0x20000000000001 produce the same result (4.8828125e-4).
What's more, for the libc++ and MSVC implementations, input between
0xfffffffffffff001 and 0xffffffffffffffff results in 1.0 (probability 1
in 2⁵³), even though the Standard is very clear that the result should
be strictly less than 1. GCC 7's libstdc++ doesn't have this issue,
whereas the versions before would enter an infinite loop.
Change-Id: Ib17dde1a1dbb49a7bba8fffd14eced3c375dd2ec
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Let's make it happen even later: at the time of QtCore's unloading from
memory. This prevents issues with something using QRandomGenerator after
the global static destructor would have run.
Change-Id: Icaa86fc7b54d4b368c0efffd14eed56bbbb51cb6
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
There's a common misconception that qDebug and friends are not
thread-safe, so let's explicitly state this.
Change-Id: I48d4ab8983017a9f2e7c9932a49ed573baa22929
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Error out if it's missing or broken (Mersenne Twister not present).
This ensures that we never have a low-quality random generator in Qt.
Change-Id: I0a103569c81b4711a649fffd14ec80649df7087e
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
The Qt documentation is using 'upper-left' everywhere except at
QRect(F) detailed description and Qt::CoordinateSystem enum description.
Therefore fix it in those four places to be consistent.
Task-number: QTBUG-59981
Change-Id: Ie652044d0207ea5a42888d9e1f1dc9a86b1e9410
Reviewed-by: Mats Honkamaa <mats.honkamaa@qt.io>
Reviewed-by: Tarja Sundqvist <tarja.sundqvist@qt.io>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Commit 282065d443 renamed the generator
functions but we didn't update all the docs.
Change-Id: I0a103569c81b4711a649fffd14ec877ffbfe710d
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
There are a couple of Q_ASSERT wrapped by the new noexcepts, but most of
those aren't validation of external parameters, only of internal
construction. The two exceptions are the checks for pointer alignment.
Change-Id: I0a103569c81b4711a649fffd14ec8523d741dfb6
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
They are needed for older compilers that doesn't support
the __fp16 extension. Reverts under the assumptions other
compilers will optimize it away.
This reverts commit 6dc7e468df.
Task-number: QTBUG-63693
Change-Id: If780de001d8c12df0db12caaf62505f16e01b663
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This is enabled by default with Xcode 9 and would therefore be seen by
anyone calling this function from C or Objective-C.
Task-number: QTBUG-63450
Change-Id: Iecd67017b6774c9f2fce2433002ff852058dd3ed
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Copy into the intended array elements, not into the start of the
array.
Change-Id: I05c4ece2450583c9358aa1eddfd702262e995146
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This is mostly relevant for Apple platforms, where we can use the new
unguarded availability warnings to guarantee that proper version checks
are present when using APIs that are not necessarily available on the
deployment target.
Change-Id: Ie408704b2924e1220491a9ea30f0141dfa4867d9
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Apparently it's all meant to be in alphabetic order by feature name
(except for where it isn't). So move my new addition to it to where
that would put it, re-order everything else to follow that rule and
add a comment documenting it.
Change-Id: I6f00d3d18fc8c492992e9f701520f3e8731739b5
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
The 'ret' variable is unused if assertions are disabled.
Change-Id: I90fec4e18e82d13b681068e222e994247988cbc5
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
It was being mis-described in some places by a QT_CONFIG(timezone)
test, replacing older QT_BOOTSTRAPPED checks; but it has no time-zone
dependency (until 5.10). So make it a separate feature in its own
right.
It turns out QAbstractSpinBox's presumed dependency on datetimeedit
was an illusion caused by use of QDATETIMEEDIT_*_MIN symbols actually
provided by datetimeparser; so remove its bogus dependency.
Change-Id: Ibc12f4a9ee35acb64a39a1c7a15d2934b5710dc0
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This allows us to retrieve the current OS type without constructing an
instance of the class, and it's also constexpr.
Change-Id: I8b32a1aebeb8139fe3fcf146e5de558fa1060bb8
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
"generate" is better than "get", and we already have "generate(it, it)"
which uses std::generate(). This changes:
- get32() → generate()
- get64() → generate64() and QRandomGenerator64::generate()
- getReal() → generateDouble()
Change-Id: I6e1fe42ae4b742a7b811fffd14e5d7bd69abcdb3
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Remaining uses of Q_NULLPTR are in:
src/corelib/global/qcompilerdetection.h
(definition and documentation of Q_NULLPTR)
tests/manual/qcursor/qcursorhighdpi/main.cpp
(a test executable compilable both under Qt4 and Qt5)
Change-Id: If6b074d91486e9b784138f4514f5c6d072acda9a
Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
This is interesting because QSemaphore now needs to allocate no memory:
it's just a simple 31-bit counter and the contention flag.
Change-Id: I6e9274c1e7444ad48c81fffd14dbc0ab42bc2e00
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Unlike qdatastream.h, we can be ready for future versions. Current plans
say we should do Qt 5.12 and then begin working on 6.0.
Change-Id: I38341f8155354cc4a776fffd14e13c2f1362b483
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
Conflicts:
examples/examples.pro
qmake/library/qmakebuiltins.cpp
src/corelib/global/qglobal.cpp
Re-apply b525ec2 to qrandom.cpp(code movement in 030782e)
src/corelib/global/qnamespace.qdoc
src/corelib/global/qrandom.cpp
src/gui/kernel/qwindow.cpp
Re-apply a3d59c7 to QWindowPrivate::setVisible() (code movement in d7a9e08)
src/network/ssl/qsslkey_openssl.cpp
src/plugins/platforms/android/androidjniinput.cpp
src/plugins/platforms/xcb/qxcbconnection.cpp
src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
src/widgets/widgets/qmenu.cpp
tests/auto/widgets/kernel/qwidget_window/tst_qwidget_window.cpp
Change-Id: If7ab427804408877a93cbe02079fca58e568bfd3
Dialogs and Sheets by default have the WindowsContextHelpButtonHint
set, which adds a question mark button to dialogs on Windows. This
button then triggers the 'What's this' mode by changing the cursor,
and letting the user explore the UI by showing whatsThis tooltips.
Anyhow, the paradigm is little used today and a lot of applications
do not set any whatsThis properties, leaving the mode pretty
non-functional. It's therefore common to explicitly remove the
WindowsContextHelpButtonHint from dialogs. However, this has to
be done for _every_ dialog.
Instead, this patch adds a global application flag to not set the
WindowsContextHelpButtonHint by default. This allows developers to
already buy into the Qt 6 behavior, where the flag will not be set
anymore by default.
[ChangeLog][QtWidgets] Added AA_DisableWindowContextHelpButton
attribute. Setting this attribute globally prevents the automatic
"What's this" button on dialogs on Windows
(WindowsContextHelpButtonHint).
Change-Id: I497a79575f222c78b2d5d051a6de346b231f72d3
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
That means a file is never created, unless you ask for the name. There's
no chance of left-over temporary files being left behind. QSaveFile also
benefits from this, since the save file is not present on disk until
commit(). Unfortunately, QSaveFile must go through a temporary name
because linkat(2) cannot overwrite -- we need rename(2) for that (for
now).
[ChangeLog][Important Behavior Changes][QTemporaryFile] On Linux,
QTemporaryFile will attempt to create unnamed temporary files. If that
succeeds, open() will return true but exists() will be false. If you
call fileName() or any function that calls it, QTemporaryFile will give
the file a name, so most applications will not see a difference.
Change-Id: I1eba2b016de74620bfc8fffd14cc843e5b0919d0
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
[ChangeLog][Binary Compatibility Note] The variable
QOperatingSystemVersion::AndroidOreo was added in this release.
Code that uses this variable will not run under Qt 5.9.1.
If backwards compatibility is desired, use instead
QOperatingSystemVersion(QOperatingSystemVersion::Android, 8)
Change-Id: I1da5a5577bf6b719e543a1ded1f9b912a83665c3
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Move deprecated and obsoleted enum values to the end, as there already
was a category for them.
Fix linking to 'Q(Gui)Application'.
Update the usage of the name macOS.
To make the table more readable in online style, add zero-width spaces
to long strings, allowing browsers to word-break them, thus avoiding
text overflow/horizontal scroll bar.
Task-number: QTWEBSITE-783
Change-Id: I0a96156d24cba4a0405c4edd8d3829def30c69bf
Reviewed-by: Venugopal Shivashankar <Venugopal.Shivashankar@qt.io>
Unified headers now defines _POSIX_THREAD_SAFE_FUNCTIONS but not all
libc functions are available in all Android API versions.
Change-Id: I01c94f0b89e7f8aa8575e7bbda28d9fe41a68ff1
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Replaced dependency to libdl.a with libshm_client.a. Defined symbols
'shm_area_password' and 'shm_area_name' internally. The build for
INTEGRITY is static only so libdl.a is not needed.
Change-Id: I7e34528835132d79ea582a30cf9ff61cdda198da
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Rolland Dudemaine <rolland@ghs.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This system call, new in Linux 4.11, gives us the file birth time. It's
also extensible, representing the fourth generation of stat(2) on Linux
(the original sys_stat(), sys_newstat(), sys_stat64() and now
sys_statx()), not to be confused with glibc's __xstat function, which
wraps a call to stat64. Anyway, the new one is designed to be extensible.
Now we get birth times on ext[34] on Linux too:
Name: .
Path: . (/home/tjmaciei/src/qt)
Size: 4096 Type: Directory
Attrs: readable writable executable hidden nativepath
Mode: drwxr-xr-x
Owner: tjmaciei (1000) Group: users (100)
Access: 2017-07-02T14:47:49.608
Birth: 2016-05-02T13:20:33.097
Change: 2017-07-01T13:37:08.737
Modified: 2017-07-01T13:37:08.737
It's not supported in any other filesystems I have (Linux sources show
xfs has the feature too). Even on ext4, it depends on whether the
filesystem was created with 256-byte inodes, which my /boot fs wasn't.
Change-Id: I8d96dea9955d4c749b99fffd14cda23ed60d5e72
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
The full documentation explains it well but a more prominent warning
will help avoid the wrong use of that class and encourage user to read
further the documentation.
Change-Id: I3178749f2b1b0350040f81eef253fd85c7ba0a5f
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
The use as in the code:
futimesat(fd, NULL, &tv)
is not documented to work. The file descriptor should be a directory's
one, not an open file (though the Linux source code seems to handle that
case). This call was done as a fallback to futimes, so it's very
unlikely a system would have futimesat and not futimes.
Both the Linux and the FreeBSD man pages say it's deprecated anyway.
Change-Id: I8d96dea9955d4c749b99fffd14cd94068dc7668a
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
The renameat2(2) Linux system call, new in 3.16, allows for the atomic
renaming of a file if and only if it won't clobber an existing
file. None of the Linux libcs have enabled this syscall as an API, so we
use syscall(3) to place the call.
If your libc has SYS_renameat2 but your kernel doesn't support it, we'll
keep issuing the unknown syscall, every time. Users in that situation
should upgrade (3.16 is from 2014).
On Darwin, there's a similar renameatx_np (guessing "np" stands for
"non-portable"). I haven't found anything similar on the other BSDs.
Change-Id: I1eba2b016de74620bfc8fffd14ccb4e455a3ec9e
Reviewed-by: David Faure <david.faure@kdab.com>
[ChangeLog][QtCore] Added qEnvironmentVariable, which returns the value
of an environment variable in a QString, while qgetenv continues to be
used to return it in a QByteArray. For Unix, since most environment
variables seem to contain path names, qEnvironmentVariable will do the
same as QFile::decodeName, which means NFC/NFD conversion on Apple OSes.
I opted not to #include <qfile.h> from qglobal.cpp to implement that
QFile::decodeName functionality, so qglobal.cpp doesn't depend on
corelib/io and to avoid possible recursions.
Task-number: QTBUG-41006
Change-Id: I14839ba5678944c2864bffff141794b8aaa7aa28
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
QDateTime takes dd and yyyy. It is confusing when the example format
strings don't work because they use DD YYYY, and it is a silent error
with the characters not getting substituted and can be easy to miss.
Improved Qt::ISODate, TZD isn't a format character so skip writing out
a bad format example.
Task-number: QTBUG-62111
Change-Id: Ia61d561074ae885fc0a99238d93cb34aaa9953bb
Reviewed-by: David Fries <david@fries.net>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Found while working on suppressing the warning about the return value
(which is either 0 or -1) was being ignored.
Task-number: QTBUG-61968
Change-Id: I02d22222fff64d4dbda4fffd14d148b1724547ca
Reviewed-by: Florian Bruhin <qt-project.org@the-compiler.org>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
__has_cpp_attribute(nodiscard) is 1 in all compilation modes, but if you
use it outside of C++1z, you get a warning.
LLVM-bug: https://bugs.llvm.org/show_bug.cgi?id=33518
Task-number: QTBUG-61840
Task-number: QTBUG-62085
Change-Id: I84e45059a888497fb55ffffd14d3683f4808978b
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
In the past, we had an undocumented text flag that worked with
one of the QPainter::drawText() overloads. This was never intended
as public API and served a specific cause in Qt WebKit at one point.
But there is a general need for such API, as disabling shaping features
easily gives 25% performance improvement on text rendering even for
fairly short strings.
This patch adds a new style strategy flag to disable shaping and
will just uses the CMAP and HDMX tables to get glyph indices and advances
for the characters. In Qt 6, the TextBypassShaping flag can be removed
completely and be replaced by the style strategy.
[ChangeLog][QtGui][Text] Added QFont::PreferNoShaping style strategy to support
improvements to performance at the expense of some cosmetic font features.
Task-number: QTBUG-56728
Change-Id: I48e025dcc06afe02824bf5b5011702a7e0036f6d
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
This removes a lot of duplicated code that existed in both qglobal.cpp
and qsystemerror.cpp, including the hack to get the correct strerror_r
signature.
This removes the incorrect use of EACCES, EMFILE, ENOENT, and ENOSPC
from qt_error_string on Windows. qt_error_string is supposed to be used
only with Win32 error codes from GetLastError(), despite there being a
lot of uses in cross-platform and even Windows-specific code that pass
errno constants.
It may or may not work: that depends on whether the constants happen to
match. ENOENT matches ERROR_FILE_NOT_FOUND and one could argue that
ENOSPC matching ERROR_OUT_OF_PAPER is acceptable, but EMFILE isn't the
same as ERROR_BAD_LENGTH nor is EACCES, ERROR_INVALID_DATA.
Change-Id: I1eba2b016de74620bfc8fffd14cccb7f77f4b510
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
The classes have recently been cleaned up to be ready for being made
public, and this change adds the final documentation. The classes are
already used in qjson, qtdeclarative and some image format decoders.
Change-Id: Ib6df89f1119162c5bad7a08e9b6f843a2db4040f
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Doesn't affect our current builds since it's just a marker for the
linker on what sections should be merged. Unless you're mixing
namespaced and non-namespaced static builds into one executable.
Change-Id: Ia53158e207a94bf49489fffd14c7bc294fccf8f9
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
First, it can never return, so we can mark it Q_NORETURN and add an
std::termianate at the end. Though if it did, we'd end up in a null-
pointer dereference crash in the caller.
Second, add Q_DECL_NOTHROW to it. It can't throw, but it terminates
execution. This also prevents both puts and fprintf from escaping via
pthread asynchronous cancellation on Linux/glibc.
Third, don't use QMessageLogger, since that allocates memory and
actually uses QString. If we really are in an OOM situation, then
QString's failed allocation would recurse back into qt_check_pointer.
We'd compound the OOM situation with a stack overflow...
Change-Id: Ia53158e207a94bf49489fffd14c81c47971f4e82
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
qt_assert and qt_check_pointer get the function name and line number
from the caller (the functions are called from the Q_ASSERT and
Q_CHECK_PTR macros, respectively), so we don't need to capture the
context from those two functions. Instead, pass the context to
QMessageLogger for proper logging.
I've left the file name and line number in the assertions, for users who
did not add them to their message log pattern, but I've removed from the
almost never used qt_check_pointer function.
Note: how useful is it that we allocate memory in response to failing to
allocate memory?
Change-Id: Ia53158e207a94bf49489fffd14c81b359c5b6537
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
The getentropy function, first found in OpenBSD, is present in glibc
since version 2.25 and Bionic since Android 6.0 and NDK r11. It uses the
Linux 3.17 getrandom system call. Unlike glibc's getrandom() wrapper,
the glibc implementation of getentropy() function is not a POSIX thread
cancellation point, so we prefer to use that even though we have to
break the reading into 256-byte blocks.
The big advantage is that these functions work even in the absence of a
/dev/urandom device node, in addition to a few cycles shaved off by not
having to open a file descriptor and close it at exit. What's more, the
glibc implementation blocks until entropy is available on early boot, so
we don't have to worry about a failure mode. The Bionic implementation
will fall back by itself to /dev/urandom and, failing that, gathering
entropy from elsewhere in the system in a way it cannot fail either.
uClibc has a wrapper to getrandom(2) but no getentropy(3). MUSL has
neither.
Change-Id: Ia53158e207a94bf49489fffd14c8cee1b968a619
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
QT_CONFIG and some other macros are unavailable there.
Change-Id: Ia53158e207a94bf49489fffd14c8d306e2dbd9d2
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
According to qcompilerdetection.h, the Dinkumware C++ library does not
have std::initializer_list, even though the compiler supports it.
Add the missing Q_COMPILER_ guards.
Change-Id: I84a7d5054c00dba38bcde15e277ceb0ee05e6cd7
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Reviewed-by: James McDonnell <jmcdonnell@blackberry.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
The values do not need to be 2 x 32-bits. Eight bits suffice for a long time to come.
Should save 189 bytes in text size on Android builds.
Change-Id: I78e31e7caa7a698f41c66d7bbac58a766c6e8834
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
The copy constructor is not disabled by any user-defined move or copy
special member function, and thus does not need to be = default'ed.
Change-Id: I90586d25756885ac77f0946c147079efb5d1b1e0
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Makes the qle_bitfield template more generic and moves it to qendian_p.h
It is also hardened to be more reliable.
Change-Id: I53214ec99cceee4f5e8934ae688c99e555a5fb42
Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
qdeadlinetimer.cpp and qelapsedtimer_*.cpp are not part of the bootstrap
library. Instead of adding them there, just remove this entropy source
from bootstrapped builds (instead of just qmake).
To compensate, store all the bits instead of trying to combine them into
just one 32-bit word. We've got a few new sources from the stack and
libc, plus two more ELF auxvec values that the Linux kernel supplies
(inspired by OpenBSD's getentropy_linux.c, which is used in Bionic).
Task-number: QTBUG-61492
Change-Id: I1d5a585d4af842f9a66ffffd14c999ae8c44f46c
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
The endian integers have more use than just in QJson, and is already
used separately by QtDeclarative. This patch moves q_littleendian out
of qjson_p.h and matches it with a corresponding q_bigendian, and puts
it to use in simplifying endian handling in the ico image handler.
Change-Id: I975bb701a089256db8ced3cb53b4bd62cdfb02dd
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Marks the bswap methods constexpr and removes the special versions
explicitly using builtins as both clang and gcc automatically
recognizes bswap code and replaces it with builtins.
Change-Id: I07258431ac2588f6046682ffb9c832e650faf66a
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Found this in a few uses of qrand() that assumed the result would be
non-negative.
Change-Id: Ia53158e207a94bf49489fffd14c7c029515cf42c
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
GCC didn't support it until version 5 or 6, so add configure tests for
both <random> and <sys/auxv.h>. Normally I'd say "upgrade", but this is
too low-level and important a feature.
There's a good chance that all our supported compilers have <random>
anyway. As for <sys/auxv.h>, it's present on Glibc, Bionic and MUSL, but
I don't see it in uClibc (AT_RANDOM is a Linux-specific feature).
Change-Id: Ia3e896da908f42939148fffd14c5b2af491f7a77
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
it contains no code.
Change-Id: Ie8a43abb2db3d040f7046206adf2bf555960dd9c
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
The Linux kernel gives us 16 bytes of random data and sets a pointer to
it in the ELF AuxV (the same one that allows us to get HWCAP on ARM
systems). So if we end up in the fallback generator, at leat we'll get a
good amount of entropy to seed the Mersenne Twister.
This could happen if the application is run in a chroot(2) or container
without /dev/random or /dev/urandom. That is probably an installation
mistake, so we don't optimize this case for performance.
With this commit, we have now good, high-quality fallbacks for Windows
(rand_s), for BSDs (arc4random) and for Linux. The only missing,
supported OS without a good entropy source is QNX.
Change-Id: Ia3e896da908f42939148fffd14c5b1084051f1a8
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
If we've never read any samples from hardware RNG or from /dev/urandom,
then there are no stored samples for us to seed the Mersenne Twister. In
that case, attempt to obtain an emergency sample that consists of some
random bits from the variable addresses (ASLR should help) and from the
clock (using nanosecond quality, instead of seconds).
There's still the possibility that we'll get poor entropy: very close to
boot, if the kernel entropy pool is empty, ASLR could be poor and the
monotonic clock value could be consistent from boot to boot. There's
nothing we can do about that.
Change-Id: Ia3e896da908f42939148fffd14c5b0c7b608371b
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
This function works even in chroots where /dev is not available. Since
it's part of the OS, it may have better ways of gathering entropy even
when we don't.
Change-Id: Ia3e896da908f42939148fffd14c5afedc8569dbc
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
This commit adds support for the x86 RDRAND instruction for
QRandomGenerator. This is the same that libstdc++-v3 uses for
std::random_device() by default. If it fails because the hardware does
not have enough entropy collected, we fall back to the operating system
generator, which often has more entropy collected from other sources.
Change-Id: Icd0e0d4b27cb4e5eb892fffd14b5167214e1ea3f
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
This class provides a reasonably-secure random number generator that
does not need seeding. That is quite unlike qrand(), which requires a
seed and is low-quality (definitely not secure).
This class is also like std::random_device, but better. It provides an
operator() like std::random_device, but unlike that, it also provides a
way to fill a buffer with random data, not just one 32-bit quantity.
It's also stateless.
Finally, it also implements std::seed_seq-like generate(). It obeys the
standard requirement of the range (32-bit) but not that of the algorithm
(if you wanted that, you'd use std::seed_seq itself). Instead,
generate() fills with pure random data.
Change-Id: Icd0e0d4b27cb4e5eb892fffd14b4e3ba9ea04da8
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Change-Id: Id6533c8a444854f6215f6e47000875ef9751905b
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Commit d56c6cf7a4 was incorrect. It was a
nice try, but on a 64-bit Mac machine (x86_64 CPU), it returned
hw.cputype = 7, which is CPU_TYPE_X86. CPU_TYPE_X86_64 is only used in
Mach-O slices for fat binaries and does not reflect hw.cputype.
Task-number: QTBUG-61205
Change-Id: Ia3e896da908f42939148fffd14c54b3050b8e64b
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Clang's definition of the __EXCEPTIONS macro is inconsistent across
platforms. When compiling for Darwin, Clang 3.6 and newer will set the
token when exceptions are enabled in either C++ or ObjC. This change
adds the reliable check described in the Clang 3.6 release notes to
ensure that QT_NO_EXCEPTIONS is defined when required.
The check requires the use of the Clang-specific __has_feature()
syntax for which a new proxy macro QT_HAS_FEATURE(x) is added in
qcompilerdetection.h
Task-number: QTBUG-61034
Change-Id: Ie7b482dfa1a4a5b700a6b97562c26b626be1fc04
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
The documentation says that it's equivalent to
qgetenv(varName).toInt()
But the implementation wasn't. QByteArray::toInt() verifies that the
entire string was consumed, so QByteArray("1a").toInt() == 0, but
qstrtoll alone doesn't. That is, qstrtoll("1a", ...) == 1.
The implementation also detected the base, a behavior I kept. Instead, I
updated the documentation.
Change-Id: I0031aa609e714ae983c3fffd14676ea6061a9268
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
The operator double() and operator long double() members of qfloat16
are causing cast ambiguities. This removes them, leaving only
operator float() which seems to be adequate.
Also, additional arithmetic operator tests were added which without
this removal fail to compile.
Change-Id: Id52a101b318fd754969b3de13c1e528d0aac2387
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
The definitions of size_t and ptrdiff_t ([support.types.layout] p2 and
p3 respectively) do not specify that they need to be as big as a
pointer. They just need to be big enough to hold the size of the largest
object and the biggest array subscript, respectively, the platform
supports (e.g., 16-bit DOS would have them as 16-bit in all memory
models, except huge).
But we depend on them actually being the size of a pointer in many
places, such as in QArrayData::offset, that stores the linear distance
from the end of the structure to the beginning of the data, wherever it
is in memory.
It's also a good idea to verify that qptrdiff and qssize_t are the same
type.
Change-Id: I9ad33fff8b634979bdbafffd14bbd1223afc58e8
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
We can't depend on QT_HAS_INCLUDE for such an important functionality in
QtQml, so detect at configure time.
alloca() is not a POSIX function (it apparently first appeared in
Version 32V AT&T UNIX), so the actual header that defines it varies from
system to system. Clearly, if alloca.h exists, that's the one, so we try
it first. On most other systems that don't define it, it's in stdlib.h.
The only exception is Windows, where it's actually defined in malloc.h.
Task-number: QTBUG-59700
Started-by: Thiago Macieira <thiago.macieira@intel.com>
Change-Id: Icd0e0d4b27cb4e5eb892fffd14b4b2b389a4684e
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
It was added to support qAsConst(). When <type_traits> became mandatory,
porting qAsConst() to std::add_const was forgotten.
Change-Id: Ifb9b54d12554ce19dca4664642a8644f49aeb6af
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
Tablet events compression has been missing since commit
60cd1c6775 in 5.6.1, and there's
no way to bring the old behavior back. Since tablet events are
not taken into account by AA_CompressHighFrequencyEvents on
purpose, we introduce this new flag.
This new flag is conditional to AA_CompressHighFrequencyEvents
being set in order for it to be effective.
[ChangeLog][QtCore][Tablet support] If the application attribute
AA_CompressTabletEvents is set in addition to AA_CompressHighFrequencyEvents,
even the QTabletEvents will be compressed (only on the X11 platform so far).
AA_CompressHighFrequencyEvents does not enable compression of tablet events
by itself, because paint applications typically need to process
all possible tablet events in order to draw the smoothest curves.
Change-Id: Ie7434ab4f9a4c64f2626c75e661cfd0d6cd22896
Task-number: QTBUG-44964
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
Reviewed-by: Wayne Arnold <wayne.arnold@autodesk.com>
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
ICC 17 does not yet implement C++17 [[fallthrough]] nor does it support
GCC's __attribute__((fallthrough))
Change-Id: I84e363d735b443cb9beefffd14b8aba60a7e3f81
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
C++ does not specify which kind of floating point implementation is
being used. The C Standard doesn't either, but it includes a normative
reference for implementations adoping it (ISO/IEC 9899:2011 Annex F).
There are a few existing checks in qfloat16.cpp; move them to qglobal.cpp
(next to the other, similar checks), and improve them by actually
checking that the radix used for floating point numbers is 2.
Change-Id: I704a3a8efeb51014b3be23fb236654d647a6f44f
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Since commit bf2160e72c, we can rely on
charNN_t support in all compilers except MSVC 2013, and since that
commit, we use (in 5.10, not 5.9, yet)
!defined(Q_OS_WIN) || defined(Q_COMPILER_UNICODE_STRINGS)
when we only need charNN_t, the type, as opposed to its library
support (u16string, char_traits<char16_t>, ...).
This patch splits the Q_C_UNICODE_STRINGS macro into two, adding
Q_STDLIB_UNICODE_STRINGS for when we need std::uNNstring, leaving
Q_C_UNICODE_STRINGS for when we need just charNN_t support.
In QDebug, when constructing a QChar out of a char16_t, cast to ushort
first, since QChar(char16_t) was only officially introduced in Qt 5.10.
[ChangeLog][Potentially Source-Incompatible Changes] The internal
Q_COMPILER_UNICODE_STRINGS macro is now defined if the compiler
supports charNN_t, even if the standard library does not. To check for
availability of std::uNNstring, use the new Q_STDLIB_UNICODE_STRINGS
macro.
Change-Id: I8f210fd7f1799fe21faf54506475a759b1f76a59
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
That's before the return type or static, inline, constexpr or such
keywords (if any).
Perl Script:
s/^(\s+)(.*) Q_REQUIRED_RESULT(;)?(\s*\/\/.*)?$/\1Q_REQUIRED_RESULT \2\3\4/
Change-Id: I7814054a102a407d876ffffd14b6a16182f159e2
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
_mm_cvtps_ph is usually defined as a macro:
qfloat16.h:122:37: error: use of old-style cast [-Werror=old-style-cast]
Change-Id: Icd0e0d4b27cb4e5eb892fffd14b516ec47826c0c
Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
QSysInfo::productType() returned "osx" for all versions of macOS, even
10.12. Change 3e2bde3578 was incorrect.
[ChangeLog][Important Behavior Changes] QSysInfo::productType() and
QFileSelector behavior on macOS was restored to match what Qt used to
return in version 5.7.0 and earlier. The behavior found in Qt 5.6.2,
5.7.1 and 5.8.0 is removed.
[ChangeLog][Future Compatibility Notice] The identifiers that
QSysInfo::productType() and QFileSelector will use to identify macOS
systems will change in Qt 6.0 to match the Apple naming guidelines which
will be current then.
Task-number: QTBUG-59849
Change-Id: Ib0e40a7a3ebc44329f23fffd14b2b39392210c4f
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Turns out that different versions of ICC use different warning numbers.
The Linux and Windows compilers emit 1786, but the macOS one emits 1478.
Don't ask me why.
Change-Id: I523b0abacd5148b2bf08fffd14b475a4c4d89ba1
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Neither the Intel compiler nor Visual C++ have a dedicated switch to
enable F16C support, like GCC and Clang do. So we used the AVX switch
for that in commit 8241d51f70, as it was
the closest, lowest denominator. That was incorrect and insufficient.
The Intel compiler silently miscompiles the intrinsics with -xAVX,
making calls to out-of-line functions like _mm_cvtps_ph, which don't
exist. So we actually have to use AVX2 support to generate correct code.
That might be a problem later, since Ivy Bridge supports F16C but not
AVX2.
Visual C++ is able to generate F16C code with just -arch:AVX.
Either way, since there's no dedicated command-line switch, there's also
no dedicated preprocessor macro. We're using __AVX2__ for both
compilers, as that's a sufficient condition to indicate a processor that
supports F16C.
Change-Id: I27b55fdf514247549455fffd14b205b8d8b86da7
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
MSVC, Apple's Clang and Clang prior to 3.9 do not recognize _cvtss_sh
and _cvtsh_ss. So expand the operation to use directly the packed
intrinsics.
Change-Id: I27b55fdf514247549455fffd14b2046fd638593d
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
qsysinfo.h(235): error #1786: enum "QSysInfo::MacVersion" (declared at line 156) was declared deprecated ("Use QOperatingSystemVersion")
Take this opportunity to merge the two groups.
Change-Id: I27b55fdf514247549455fffd14b1c2a1d8eab869
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Aligns with EPERM (Operation not permitted) and ENOENT (No such file
or directory), and is what errno is set to on macOS when opening the
/dev/tty device when running inside e.g. Xcode, where isatty() will
return true.
Change-Id: I09b88eaa3ff611d95ab37f0ff4df9aaaca52747d
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
When we call realloc, the alignment of the new block may be different
from the old one. When that happens, we need to memmove the data to the
new position, before we start overwriting things.
Task-number: QTBUG-59804
Change-Id: I27b55fdf514247549455fffd14b07ea78918a3d0
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
GCC 7 defines __has_cpp_attribute even when invoked as "gcc" (possibly,
Clang does the same, according to a comment in the code, did not test
myself).
Hence, define the fallthrough declaration (as C++11 attributes)
only when compiling as C++, otherwise we pick them up even in C mode,
and they cause build failures.
Change-Id: I3f13205e014bb1dea59ee3664b29111521a7eae3
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Clang implements the _cvtss_sh intrinsic by way of a macro, which
uses a C99 extension and that's not allowed in C++ mode:
float16.h:119:11: error: compound literals are a C99-specific feature [-Werror,-Wc99-extensions]
/usr/bin/../lib64/clang/3.9.1/include/f16cintrin.h:76:55: note: expanded from macro '_cvtss_sh'
Reported at https://bugs.llvm.org/show_bug.cgi?id=32491.
Change-Id: I27b55fdf514247549455fffd14b170df75dd4e1f
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
It replaces Posix' ssize_t in cross-platform code. Most importantly,
it allows QStringView users to refer to QStringView::size_type by
a shorter, less intimidating name.
Change-Id: I2128fefd2ffdd258b0b55cd90802a23c6bc033f6
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Also use canonical contact url.
Change-Id: I43f8c6a2c4949ee0e054045bccc17d82575b072c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Jani Heikkinen <jani.heikkinen@qt.io>
Fix the condition in QWidgetPrivate::resolveLocale() to decide whether
to propagate locale: make it match setLocale_helper()'s condition when
deciding whether to propagate to descendants. This lead to a
QDateTimeEdit's calendar popup not getting told what locale to use
correctly, unless we setLocale() on it overtly, which then blocked
propagation of locale changes to it unless QDateTimeEdit manually
propagated the changes.
Fix the documentation of WA_WindowPropagation to mention locale as
also being propagated (which it was in several places, only neglecting
this one in resolveLocale).
[ChangeLog][QWidget][Qt::WA_WindowPropagation] Propagate locale
consistently, along with font and palette, within the widget
hierarchy. Previously, locale was propagated on ancestral
setLocale(), but not on creation of the descendant.
Task-number: QTBUG-59106
Change-Id: I92270f7789c8eda66a458274a658c84c7b0df754
Reviewed-by: David Faure <david.faure@kdab.com>
[ChangeLog][QtCore][Logging] If you set QT_FATAL_WARNINGS to a number
greater than 1, Qt will stop the application at that nth warning,
instead of on the first one. For compatibility reasons with previous
versions, if the variable is set to any non-empty and non-numeric value
different from 0, Qt will understand as "stop on first warning".
Change-Id: I0031aa609e714ae983c3fffd14676f1826f34600
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
We need Q_ASSERT in (C++11) constexpr functions, and the only way to
inject them in C++11 is to use the comma operator. E.g. in
QLatin1String:
constexpr QLatin1Char at(int i) const
{ return assert(1 >= 0), assert(i < size()), m_data[i]; }
The main problem with our existing Q_ASSERT is that while it is a
ternary expression in active mode, it was a statement in passive
mode. This is easily fixed by dropping the do-while loop and leaving
just its parenthesized exit condition. Add a cast to void, too,
ensuring that Q_ASSERT has type void in both passive and active modes.
But even in C++14 constexpr functions, which accept several
statements, Q_ASSERT needs to have a path through its conditionals
that is constexpr, but neither qt_assert(_x) nor qt_noop() are
constexpr. Nor can they be in C++11 (no void returns in C++11
constexpr functions). I fixed this by replacing qt_noop() with
static_cast<void>(0). The void cast is required so both 2nd and 3rd
arguments to the ternary are void (mixing void and non-void branches
in the ternary is only allowed if the void leg is a
throw-expression[1]).
As a drive-by, adjust to style guide, remove overparenthesization and
reverse the conditional in the ternary.
Apply it to QLatin1String where we had the problem that constexpr
functions had a narrow constract.
[1] should probably be extended to any [[noreturn]] void function,
e.g. std::terminate().
[ChangeLog][QtCore][QtGlobal] Q_ASSERT() and Q_ASSERT_X() now always
expand to expressions of type void that are usable in constexpr
contexts. This makes them usable in both C++11 and C++14 constexpr
functions.
Change-Id: I09c396bc0034ac344cfaadc6f8cbeb1b7b0cbabc
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Shortcuts are universally not shown on macOS or mobile platforms, making
applications look very obviously out of place.
Windows and GNOME desktop environments almost never use them.
Only KDE appears to do so commonly; default accordingly.
Task-number: QTBUG-49435
Change-Id: Ieac4cee57b15a02be5258f3d07749af6316af62b
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@qt.io>
