If the concatenation of arguments dir and bin has at least PATH_MAX
characters the call to snprintf will truncate. The result will usually
not exist, but if it does it's actually incorrect to return that the
path exists.
(Motivated by GCC compiler warning about format truncation.)
Differential Revision: https://reviews.llvm.org/D58835
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356036 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
AIX compilers define macros based on the version of the operating
system.
This patch implements updating of versionless AIX triples to include the
host AIX version. Also, the host triple detection in the build system is
adjusted to strip the AIX version information so that the run-time
detection is preferred.
Reviewers: xingxue, stefanp, nemanjai, jasonliu
Reviewed By: xingxue
Subscribers: mgorny, kristina, jdoerfert, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D58798
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@355995 91177308-0d34-0410-b5e6-96231b3b80d8
Use sysctl() to implement getMainExecutable() on NetBSD, rather than
trying to guess the correct path from argv[0]. This is one
of the fixes to recent clang-check-mac-libcxx-fixed-compilation-db.cpp
test failure on NetBSD.
This has been historically done on both FreeBSD and NetBSD in r303015,
and reverted in r303285 due to buggy implementation on FreeBSD.
However, FWIK the NetBSD implementation does not suffer from the same
bugs and is more reliable than playing with argv[0].
Differential Revision: https://reviews.llvm.org/D56975
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@355283 91177308-0d34-0410-b5e6-96231b3b80d8
In file included from /home/buildbots/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/llvm/lib/Support/Memory.cpp:14:
/home/buildbots/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/llvm/include/llvm/Support/Memory.h:38:14: error: private field 'Flags' is not used [-Werror,-Wunused-private-field]
unsigned Flags = 0;
^
1 error generated.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@355066 91177308-0d34-0410-b5e6-96231b3b80d8
This patch introduces Memory::MF_HUGE_HINT which indicates that allocateMappedMemory() shall return a pointer to a large memory page.
However the flag is a hint because we're not guaranteed in any way that we will get back a large memory page. There are several restrictions:
- Large/huge memory pages aren't enabled by default on modern OSes (Windows 10 and Linux at least), and should be manually enabled/reserved.
- Once enabled, it should be kept in mind that large pages are physical only, they can't be swapped.
- Memory fragmentation can affect the availability of large pages, especially after running the OS for a long time and/or running along many other applications.
Memory::allocateMappedMemory() will fallback to 4KB pages if it can't allocate 2MB large pages (if Memory::MF_HUGE_HINT is provided)
Currently, Memory::MF_HUGE_HINT only works on Windows. The hint will be ignored on Linux, 4KB pages will always be returned.
Differential Revision: https://reviews.llvm.org/D58718
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@355065 91177308-0d34-0410-b5e6-96231b3b80d8
As far as I can tell, malloc.h is only being used here to provide
a definition of mallinfo (malloc itself is declared in stdlib.h via
cstdlib). We already have a macro for whether mallinfo is available,
so switch to using that instead.
Differential Revision: https://reviews.llvm.org/D57807
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353329 91177308-0d34-0410-b5e6-96231b3b80d8
Previously, MemoryBlock automatically extends a requested buffer size to a
multiple of page size because (I believe) doing it was thought to be harmless
and with that you could get more memory (on average 2KiB on 4KiB-page systems)
"for free".
That programming interface turned out to be error-prone. If you request N
bytes, you usually expect that a resulting object returns N for `size()`.
That's not the case for MemoryBlock.
Looks like there is only one place where we take the advantage of
allocating more memory than the requested size. So, with this patch, I
simply removed the automatic size expansion feature from MemoryBlock
and do it on the caller side when needed. MemoryBlock now always
returns a buffer whose size is equal to the requested size.
Differential Revision: https://reviews.llvm.org/D56941
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351916 91177308-0d34-0410-b5e6-96231b3b80d8
to reflect the new license.
We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.
Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351636 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
getLastAccessedTime() and getLastModificationTime() provided times in nanoseconds but with only 1 second resolution, even when the underlying file system could provide more precise times than that.
These changes add sub-second precision for unix platforms that support improved precision.
Also add some comments to make sure people are aware that the resolution of times can vary across different file systems.
Reviewers: labath, zturner, aaron.ballman, kristina
Reviewed By: aaron.ballman, kristina
Subscribers: lebedev.ri, mgorny, kristina, llvm-commits
Differential Revision: https://reviews.llvm.org/D54826
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@347530 91177308-0d34-0410-b5e6-96231b3b80d8
In D54435 there was some discussion about the expand_tilde flag for
real_path that I wanted to expose through the VFS. The consensus is that
these two things should be separate functions. Since we already have the
code for this I went ahead and added a function expand_tilde that does
just that.
Differential revision: https://reviews.llvm.org/D54448
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346776 91177308-0d34-0410-b5e6-96231b3b80d8
On GNU/Hurd, llvm-config is returning bogus value, such as:
$ llvm-config-6.0 --includedir
/usr/include
while it should be:
$ llvm-config-6.0 --includedir
/usr/lib/llvm-6.0/include
This is because getMainExecutable does not get the actual installation
path. On GNU/Hurd, /proc/self/exe is indeed a symlink to the path that
was used to start the program, and not the eventual binary file. Llvm's
getMainExecutable thus needs to run realpath over it to get the actual
place where llvm was installed (/usr/lib/llvm-6.0/bin/llvm-config), and
not /usr/bin/llvm-config-6.0. This will not change the result on Linux,
where /proc/self/exe already points to the eventual file.
Patch by Samuel Thibault!
While making changes here, I reformatted this block a bit to reduce
indentation and match 2 space indent style.
Differential Revision: https://reviews.llvm.org/D53557
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@345104 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
We tell the user to file a bug report on LLVM right now, and
SIGPIPE isn't LLVM's fault so our error message is wrong.
Allows frontends to detect SIGPIPE from writing to closed readers.
This can be seen commonly from piping into head, tee, or split.
Fixes PR25349, rdar://problem/14285346, b/77310947
Reviewers: jfb
Reviewed By: jfb
Subscribers: majnemer, kristina, llvm-commits, thakis, srhines
Differential Revision: https://reviews.llvm.org/D53000
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@344372 91177308-0d34-0410-b5e6-96231b3b80d8
This is available on most platforms (Linux/Mac/Win/BSD) with no extra syscalls.
On other platforms (e.g. Solaris) we stat() if this information is requested.
This will allow switching clang's VFS to efficiently expose (path, type) when
traversing a directory. Currently it exposes an entire Status, but does so by
calling fs::status() on all platforms.
Almost all callers only need the path, and all callers only need (path, type).
Patch by sammccall (Sam McCall)
Differential Revision: https://reviews.llvm.org/D51918
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@342089 91177308-0d34-0410-b5e6-96231b3b80d8
In Bionic, open can be overloaded for _FORTIFY_SOURCE support, causing
compile errors of RetryAfterSignal due to overload resolution. Wrapping
the call in a lambda avoids this.
Based on a patch by Chih-Wei Huang <cwhuang@linux.org.tw>!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@340751 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
Add an overload to sys::fs::setLastModificationAndAccessTime that allows setting last access and modification times separately. This will allow tools to use this API when they want to preserve both the access and modification times from an input file, which may be different.
Also note that both the POSIX (futimens/futimes) and Windows (SetFileTime) APIs take the two timestamps in the order of (1) access (2) modification time, so this renames the method to "setLastAccessAndModificationTime" to make it clear which timestamp is which.
For existing callers, the 1-arg overload just sets both timestamps to the same thing.
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D50521
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@339628 91177308-0d34-0410-b5e6-96231b3b80d8
Haiku does not expose information about local versus remote mounts, so just
return false, like Cygwin.
Patch by Niels Sascha Reedijk.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337389 91177308-0d34-0410-b5e6-96231b3b80d8
On Windows we've observed that if you open a file, write to it, map it into
memory and close the file handle, the contents of the memory mapping can
sometimes be incorrect. That was what we did when adding an entry to the
ThinLTO cache using the TempFile and MemoryBuffer classes, and it was causing
intermittent build failures on Chromium's ThinLTO bots on Windows. More
details are in the associated Chromium bug (crbug.com/786127).
We can prevent this from happening by keeping a handle to the file open while
the mapping is active. So this patch changes the mapped_file_region class to
duplicate the file handle when mapping the file and close it upon unmapping it.
One gotcha is that the file handle that we keep open must not have been
created with FILE_FLAG_DELETE_ON_CLOSE, as otherwise the operating system
will prevent other processes from opening the file. We can achieve this
by avoiding the use of FILE_FLAG_DELETE_ON_CLOSE altogether. Instead,
we use SetFileInformationByHandle with FileDispositionInfo to manage the
delete-on-close bit. This lets us remove the hack that we used to use to
clear the delete-on-close bit on a file opened with FILE_FLAG_DELETE_ON_CLOSE.
A downside of using SetFileInformationByHandle/FileDispositionInfo as
opposed to FILE_FLAG_DELETE_ON_CLOSE is that it prevents us from using
CreateFile to open the file while the flag is set, even within the same
process. This doesn't seem to matter for almost every client of TempFile,
except for LockFileManager, which calls sys::fs::create_link to create a
hard link from the lock file, and in the process of doing so tries to open
the file. To prevent this change from breaking LockFileManager I changed it
to stop using TempFile by effectively reverting r318550.
Differential Revision: https://reviews.llvm.org/D48051
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334630 91177308-0d34-0410-b5e6-96231b3b80d8
This simplifies some code which had StringRefs to begin with, and
makes other code more complicated which had const char* to begin
with.
In the end, I think this makes for a more idiomatic and platform
agnostic API. Not all platforms launch process with null terminated
c-string arrays for the environment pointer and argv, but the api
was designed that way because it allowed easy pass-through for
posix-based platforms. There's a little additional overhead now
since on posix based platforms we'll be takign StringRefs which
were constructed from null terminated strings and then copying
them to null terminate them again, but from a readability and
usability standpoint of the API user, I think this API signature
is strictly better.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334518 91177308-0d34-0410-b5e6-96231b3b80d8
I took some liberties and quoted fewer characters than before,
based on an article from MSDN which says that only certain characters
cause an arg to require quoting. This seems to be incorrect, though,
and worse it seems to be a difference in Windows version. The bot
that fails is Windows 7, and I can't reproduce the failure on Win
10. But it's definitely related to quoting and special characters,
because both tests that fail have a * in the argument, which is one
of the special characters that would cause an argument to be quoted
before but not any longer after the new patch.
Since I don't have Win 7, all I can do is just guess that I need to
restore the old quoting rules. So this patch does that in hopes that
it fixes the problem on Windows 7.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334375 91177308-0d34-0410-b5e6-96231b3b80d8
This reverts commit 65243b6d19143cb7a03f68df0169dcb63e8b4632.
Seems like it's not a flake. It might have something to do with
the '*' character being in a command line.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334356 91177308-0d34-0410-b5e6-96231b3b80d8
There were a few linux compilation failures, but other than that
I think this was just a flake that caused the tests to fail. I'm
going to resubmit and see if the failures go away, if not I'll
revert again.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334355 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
The function `llvm::sys::commandLineFitsWithinSystemLimits` appears to be overestimating the system limits. This issue was discovered while attempting to enable response files in the Swift compiler. When the compiler submits its frontend jobs, those jobs are subjected to the system limits on command line length. `commandLineFitsWithinSystemLimits` is used to determine if the job's arguments need to be wrapped in a response file. There are some cases where the argument size for the job passes `commandLineFitsWithinSystemLimits`, but actually exceeds the real system limit, and the job fails.
`clang` also uses this function to decide whether or not to wrap it's job arguments in response files. See: https://github.com/llvm-mirror/clang/blob/master/lib/Driver/Driver.cpp#L1341. Clang will also fail for response files who's size falls within a certain range. I wrote a script that should find a failure point for `clang++`. All that is needed to run it is Python 2.7, and a simple "hello world" program for `test.cc`. It should run on Linux and on macOS. The script is available here: https://gist.github.com/dabelknap/71bd083cd06b91c5b3cef6a7f4d3d427. When it hits a failure point, you should see a `clang: error: unable to execute command: posix_spawn failed: Argument list too long`.
The proposed solution is to mirror the behavior of `xargs` in `commandLinefitsWithinSystemLimits`. `xargs` defaults to 128k for the command line length size (See: https://fossies.org/dox/findutils-4.6.0/buildcmd_8c_source.html#l00551). It adjusts this depending on the value of `ARG_MAX`.
Reviewers: alexfh
Reviewed By: alexfh
Subscribers: llvm-commits
Tags: #clang
Patch by Austin Belknap!
Differential Revision: https://reviews.llvm.org/D47795
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334295 91177308-0d34-0410-b5e6-96231b3b80d8
NFC here, this just raises some platform specific ifdef hackery
out of a class and creates proper platform-independent typedefs
for the relevant things. This allows these typedefs to be
reused in other places without having to reinvent this preprocessor
logic.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334294 91177308-0d34-0410-b5e6-96231b3b80d8
O_CLOEXEC is the right default, but occasionally you don't
want this. This is especially true for tools like debuggers
where you might need to spawn the child process with specific
files already open, but it's occasionally useful in other
scenarios as well, like when you want to do some IPC between
parent and child.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334293 91177308-0d34-0410-b5e6-96231b3b80d8
This one allows much more flexibility than the standard
openFileForRead / openFileForWrite functions. Since there is now
just one "real" function that does the work, all other implementations
simply delegate to this one.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334246 91177308-0d34-0410-b5e6-96231b3b80d8
This breaks the OpenFlags enumeration into two separate
enumerations: OpenFlags and CreationDisposition. The first
controls the behavior of the API depending on whether or not
the target file already exists, and is not a flags-based
enum. The second controls more flags-like values.
This yields a more easy to understand API, while also allowing
flags to be passed to the openForRead api, where most of the
values didn't make sense before. This also makes the apis more
testable as it becomes easy to enumerate all the configurations
which make sense, so I've added many new tests to exercise all
the different values.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334221 91177308-0d34-0410-b5e6-96231b3b80d8
Windows' CRT has a limit of 512 open file descriptors, and fds which are
generated by converting a HANDLE via _get_osfhandle count towards this
limit as well.
Regardless, often you find yourself marshalling back and forth between
native HANDLE objects and fds anyway. If we know from the getgo that
we're going to need to work directly with the handle, we can cut out the
marshalling layer while also not contributing to filling up the CRT's
very limited handle table.
On Unix these functions just delegate directly to the existing set of
functions since an fd *is* the native file type. It would be nice, very
long term, if we could convert most uses of fds to file_t.
Differential Revision: https://reviews.llvm.org/D47688
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333945 91177308-0d34-0410-b5e6-96231b3b80d8
The return value of sys::getDefaultTargetTriple, which is derived from
-DLLVM_DEFAULT_TRIPLE, is used to construct tool names, default target,
and in the future also to control the search path directly; as such it
should be used textually, without interpretation by LLVM.
Normalization of this value may lead to unexpected results, for example
if we configure LLVM with -DLLVM_DEFAULT_TARGET_TRIPLE=x86_64-linux-gnu,
normalization will transform that value to x86_64--linux-gnu. Driver will
use that value to search for tools prefixed with x86_64--linux-gnu- which
may be confusing. This is also inconsistent with the behavior of the
--target flag which is taken as-is without any normalization and overrides
the value of LLVM_DEFAULT_TARGET_TRIPLE.
Users of sys::getDefaultTargetTriple already perform their own
normalization as needed, so this change shouldn't impact existing logic.
Differential Revision: https://reviews.llvm.org/D47153
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333307 91177308-0d34-0410-b5e6-96231b3b80d8
The return value of sys::getDefaultTargetTriple, which is derived from
-DLLVM_DEFAULT_TRIPLE, is used to construct tool names, default target,
and in the future also to control the search path directly; as such it
should be used textually, without interpretation by LLVM.
Normalization of this value may lead to unexpected results, for example
if we configure LLVM with -DLLVM_DEFAULT_TARGET_TRIPLE=x86_64-linux-gnu,
normalization will transform that value to x86_64--linux-gnu. Driver will
use that value to search for tools prefixed with x86_64--linux-gnu- which
may be confusing. This is also inconsistent with the behavior of the
--target flag which is taken as-is without any normalization and overrides
the value of LLVM_DEFAULT_TARGET_TRIPLE.
Users of sys::getDefaultTargetTriple already perform their own
normalization as needed, so this change shouldn't impact existing logic.
Differential Revision: https://reviews.llvm.org/D46910
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332750 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
Before this patch, signal handling wasn't signal safe. This leads to real-world
crashes. It used ManagedStatic inside of signals, this can allocate and can lead
to unexpected state when a signal occurs during llvm_shutdown (because
llvm_shutdown destroys the ManagedStatic). It also used cl::opt without custom
backing storage. Some de-allocation was performed as well. Acquiring a lock in a
signal handler is also a great way to deadlock.
We can't just disable signals on llvm_shutdown because the signals might do
useful work during that shutdown. We also can't just disable llvm_shutdown for
programs (instead of library uses of clang) because we'd have to then mark the
pointers as not leaked and make sure all the ManagedStatic uses are OK to leak
and remain so.
Move all of the code to lock-free datastructures instead, and avoid having any
of them in an inconsistent state. I'm not trying to be fancy, I'm not using any
explicit memory order because this code isn't hot. The only purpose of the
atomics is to guarantee that a signal firing on the same or a different thread
doesn't see an inconsistent state and crash. In some cases we might miss some
state (for example, we might fail to delete a temporary file), but that's fine.
Note that I haven't touched any of the backtrace support despite it not
technically being totally signal-safe. When that code is called we know
something bad is up and we don't expect to continue execution, so calling
something that e.g. sets errno is the least of our problems.
A similar patch should be applied to lib/Support/Windows/Signals.inc, but that
can be done separately.
Fix r332428 which I reverted in r332429. I originally used double-wide CAS
because I was lazy, but some platforms use a runtime function for that which
thankfully failed to link (it would have been bad for signal handlers
otherwise). I use a separate flag to guard the data instead.
<rdar://problem/28010281>
Reviewers: dexonsmith
Subscribers: steven_wu, llvm-commits
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332496 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
Before this patch, signal handling wasn't signal safe. This leads to real-world
crashes. It used ManagedStatic inside of signals, this can allocate and can lead
to unexpected state when a signal occurs during llvm_shutdown (because
llvm_shutdown destroys the ManagedStatic). It also used cl::opt without custom
backing storage. Some de-allocation was performed as well. Acquiring a lock in a
signal handler is also a great way to deadlock.
We can't just disable signals on llvm_shutdown because the signals might do
useful work during that shutdown. We also can't just disable llvm_shutdown for
programs (instead of library uses of clang) because we'd have to then mark the
pointers as not leaked and make sure all the ManagedStatic uses are OK to leak
and remain so.
Move all of the code to lock-free datastructures instead, and avoid having any
of them in an inconsistent state. I'm not trying to be fancy, I'm not using any
explicit memory order because this code isn't hot. The only purpose of the
atomics is to guarantee that a signal firing on the same or a different thread
doesn't see an inconsistent state and crash. In some cases we might miss some
state (for example, we might fail to delete a temporary file), but that's fine.
Note that I haven't touched any of the backtrace support despite it not
technically being totally signal-safe. When that code is called we know
something bad is up and we don't expect to continue execution, so calling
something that e.g. sets errno is the least of our problems.
A similar patch should be applied to lib/Support/Windows/Signals.inc, but that
can be done separately.
<rdar://problem/28010281>
Reviewers: dexonsmith
Subscribers: aheejin, llvm-commits
Differential Revision: https://reviews.llvm.org/D46858
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332428 91177308-0d34-0410-b5e6-96231b3b80d8
As requested in D46858, pulling this function into its own lambda makes it
easier to read that part of the code and reason as to what's going on because
the scope it can be called from is extremely limited. We want to keep it as a
function because it's called from the two subsequent lines.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332325 91177308-0d34-0410-b5e6-96231b3b80d8
Don't prepend function or data name before each comment. Split into its own NFC patch as requested in D46858.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332323 91177308-0d34-0410-b5e6-96231b3b80d8
These are necessary changes to support building LLVM for Fuchsia.
While these are not sufficient to run on Fuchsia, they are still
useful when cross-compiling LLVM libraries and runtimes for Fuchsia.
Differential Revision: https://reviews.llvm.org/D46345
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331423 91177308-0d34-0410-b5e6-96231b3b80d8
This is a follow-up to r331272.
We've been running doxygen with the autobrief option for a couple of
years now. This makes the \brief markers into our comments
redundant. Since they are a visual distraction and we don't want to
encourage more \brief markers in new code either, this patch removes
them all.
Patch produced by
for i in $(git grep -l '\@brief'); do perl -pi -e 's/\@brief //g' $i & done
https://reviews.llvm.org/D46290
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331275 91177308-0d34-0410-b5e6-96231b3b80d8
