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2017-07-31[msan] Reverting D36093Kostya Kortchinsky
Summary: Reverting D36093 until I can figure out how to launch the correct tests :/ My apologies. Reviewers: alekseyshl Reviewed By: alekseyshl Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D36120 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309637 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-31Add powerpc64 to compiler-rt build infrastructure.Sterling Augustine
Summary: Add powerpc64 to compiler-rt build infrastructure. Reviewers: timshen Reviewed By: timshen Subscribers: nemanjai, dberris, mgorny, aheejin, cfe-commits Differential Revision: https://reviews.llvm.org/D36108 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309634 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-31Remove STL/microsoft-specific CFI blacklist entriesPeter Collingbourne
Patch by Vlad Tsyrklevich! Differential Revision: https://reviews.llvm.org/D35855 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309617 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-31[msan] Check for pvalloc overflowKostya Kortchinsky
Summary: `CheckForPvallocOverflow` was introduced with D35818 to detect when pvalloc would wrap when rounding up to the next multiple of the page size. Add this check to MSan's pvalloc implementation. Reviewers: alekseyshl Reviewed By: alekseyshl Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D36093 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309601 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-31[asan] Move shadow memory setup into its own fileVitaly Buka
Submitted on behalf of Roland McGrath. Reviewers: vitalybuka, alekseyshl, kcc Subscribers: kubamracek, mgorny, phosek, filcab, llvm-commits Tags: #sanitizers Differential Revision: https://reviews.llvm.org/D36037 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309542 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-31[sanitizer_common] Add SANITIZER_FUCHSIAVitaly Buka
Summary: More changes to follow will add the Fuchsia port. Submitted on behalf of Roland McGrath. Reviewers: vitalybuka, alekseyshl, kcc Reviewed By: vitalybuka Subscribers: kubamracek, llvm-commits, phosek, filcab Tags: #sanitizers Differential Revision: https://reviews.llvm.org/D36027 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309539 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-31[builtins] Fix mingw-w64 cross compilationMartin Storsjo
Lowercase the Windows.h include in enable_execute_stack.c, just as in emutls.c in SVN r302340. Differential Revision: https://reviews.llvm.org/D36066 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309537 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-31[sanitizer_common] Rename SI_NOT_WINDOWS to SI_POSIXVitaly Buka
Summary: New systems might be neither Windows nor POSIX. The SI_NOT_WINDOWS macro in sanitizer_platform_interceptors.h was already effectively the same as SI_POSIX, so just use SI_POSIX instead. Submitted on behalf of Roland McGrath. Reviewers: vitalybuka, alekseyshl, kcc Reviewed By: vitalybuka Subscribers: phosek, filcab, llvm-commits, kubamracek Tags: #sanitizers Differential Revision: https://reviews.llvm.org/D36038 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309536 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-31[XRay][compiler-rt] Do not print the warning when the binary is not XRay ↵Dean Michael Berris
instrumented. Summary: Currently when the XRay runtime is linked into a binary that doesn't have the instrumentation map, we print a warning unconditionally. This change attempts to make this behaviour more quiet. Reviewers: kpw, pelikan Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D35789 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309534 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-29[ubsan] Diagnose invalid uses of builtins (compiler-rt)Vedant Kumar
Differential Revision: https://reviews.llvm.org/D34591 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309461 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-28[compiler-rt] Add missing quotation marks to msan_compile invocationKrzysztof Parzyszek
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309430 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-28Add clear_cache implementation for ppc64. Fix buffer to meet ppc64 alignment.Sterling Augustine
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309423 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-28[sanitizers test CMake] further refactor testing CMake for tsanGeorge Karpenkov
TSan tests on Darwin first link all libraries into a static archive file. With this change, the linking is done once per all architecture, and previously the linking step was repeated per each architecture per each add_tsan_test call. Furthermore, the code is cleared up. Differential Revision: https://reviews.llvm.org/D35913 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309406 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-28[sanitizer tests CMake] Factor out CMake logic for compiling sanitizer testsGeorge Karpenkov
Currently there's a large amount of CMake logic duplication for compiling sanitizer tests. If we add more sanitizers, the duplication will get even worse. This change factors out common compilation commands into a macro available to all sanitizers. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309405 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-28Change INSTR_PROF_DEFAULT_NUM_VAL_PER_SITE from 8 to 16.Dehao Chen
Summary: In the current implementation, the defaul number of values per site tracked by value profiler is 8, which is too small and could introduce inaccuracies to profile. Changing it to 16 will be able to gain more accurate value profiler. Reviewers: davidxl, tejohnson Reviewed By: tejohnson Subscribers: sanjoy, llvm-commits Differential Revision: https://reviews.llvm.org/D35964 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309388 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-28Support libc++abi in addition to libstdc++Petr Hosek
This change adds sanitizer support for LLVM's libunwind and libc++abi as an alternative to libstdc++. This allows using the in tree version of libunwind and libc++abi which is useful when building a toolchain for different target. Differential Revision: https://reviews.llvm.org/D34501 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309362 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-28Support compiler-rt builtinsPetr Hosek
This change adds support for compiler-rt builtins as an alternative compiler runtime to libgcc. Differential Revision: https://reviews.llvm.org/D35165 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309361 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-28[sanitizers] Sanitizer tests CMake clean up: try #2George Karpenkov
This patch addresses two issues: Most of the time, hacks with `if/else` in order to get support for multi-configuration builds are superfluous. The variable `CMAKE_CFG_INTDIR` was created precisely for this purpose: it expands to `.` on all single-configuration builds, and to a configuration name otherwise. The `if/else` hacks for the library name generation should also not be done, as CMake has `TARGET_FILE` generator expression precisely for this purpose, as it expands to the exact filename of the resulting target. Differential Revision: https://reviews.llvm.org/D35952 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309341 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-27[sancov] Implement __sanitizer_cov_reset.Evgeniy Stepanov
Summary: Clears all collected coverage. Reviewers: kcc Subscribers: srhines, kubamracek, llvm-commits Differential Revision: https://reviews.llvm.org/D35958 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309333 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-27Revert "[sanitizers] Sanitizer tests CMake clean up"George Karpenkov
This reverts commit 0ab44db2aa1cd3710355ad79b04f954ce68c0b3a. Fails on some bots, reverting until I can fix it. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309318 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-27[sanitizers] Sanitizer tests CMake clean upGeorge Karpenkov
This patch addresses two issues: Most of the time, hacks with `if/else` in order to get support for multi-configuration builds are superfluous. The variable `CMAKE_CFG_INTDIR` was created precisely for this purpose: it expands to `.` on all single-configuration builds, and to a configuration name otherwise. The `if/else` hacks for the library name generation should also not be done, as CMake has `TARGET_FILE` generator expression precisely for this purpose, as it expands to the exact filename of the resulting target. Differential Revision: https://reviews.llvm.org/D35952 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309306 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-26Add liblog to ubsan `UBSAN_DYNAMIC_LIBS`Leo Li
Summary: liblog is still required to create ubsan runtimes on Android when __ANDROID_API__ < 21. Reviewers: eugenis, vsk Subscribers: kubamracek, mgorny, pirama, srhines, llvm-commits Differential Revision: https://reviews.llvm.org/D35915 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309180 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-26[sanitizer-coverage] remove stale codeKostya Serebryany
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309173 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-26Revert "[sanitizer] Support compiler-rt builtins"Petr Hosek
This reverts commit fd63314d6770e0da62572a3fea2c41c4cc0fc58a. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309083 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-26Revert "[sanitizer] Support libc++abi in addition to libstdc++"Petr Hosek
This reverts commit d1997bff31cf6b484eb59c2ee1fc3155442e338c. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309082 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-26[sanitizer] Support libc++abi in addition to libstdc++Petr Hosek
This change adds sanitizer support for LLVM's libunwind and libc++abi as an alternative to libstdc++. This allows using the in tree version of libunwind and libc++abi which is useful when building a toolchain for different target. Differential Revision: https://reviews.llvm.org/D34501 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309074 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-25[sanitizer] Support compiler-rt builtinsPetr Hosek
This change adds support for compiler-rt builtins as an alternative compiler runtime to libgcc. Differential Revision: https://reviews.llvm.org/D35165 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309060 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-25[scudo] Check for pvalloc overflowKostya Kortchinsky
Summary: Previously we were rounding up the size passed to `pvalloc` to the next multiple of page size no matter what. There is an overflow possibility that wasn't accounted for. So now, return null in the event of an overflow. The man page doesn't seem to indicate the errno to set in this particular situation, but the glibc unit tests go for ENOMEM (https://code.woboq.org/userspace/glibc/malloc/tst-pvalloc.c.html#54) so we'll do the same. Update the aligned allocation funtions tests to check for properly aligned returned pointers, and the `pvalloc` corner cases. @alekseyshl: do you want me to do the same in the other Sanitizers? Reviewers: alekseyshl Reviewed By: alekseyshl Subscribers: kubamracek, alekseyshl, llvm-commits Differential Revision: https://reviews.llvm.org/D35818 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@309033 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-25Only scan global sections containing data in LSan on darwinFrancis Ricci
Summary: __DATA segments on Darwin contain a large number of separate sections, many of which cannot actually contain pointers, and contain const values or objc metadata. Not scanning sections which cannot contain pointers significantly improves performance. On a medium-sized (~4000 files) internal project, I saw a speedup of about 30% in standalone LSan's execution time (30% improvement in the time spent running LSan, not the total program time). Reviewers: kcc, kubamracek, alekseyshl Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D35432 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308999 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-25Fix unused variable warning with MemoryMappedSegment private dataFrancis Ricci
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308992 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-25Revert "[compiler-rt] Include thread ID into sanitizers logs"Vitaly Buka
This improvement introduce additional dependencies on sandboxed environments. This reverts commit r308637. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308984 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-25Add address ranges for individual macho sections on darwinFrancis Ricci
Summary: This is a re-upload of the reverted commit r308644. It has changed quite a bit to reflect post-commit comments by kcc, so I'm re-uploading as a new review. Reviewers: kubamracek, alekseyshl, kcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D35799 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308977 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-24[Sanitizers] TSan allocator set errno on failure.Alex Shlyapnikov
Summary: Set proper errno code on allocation failures and change realloc, pvalloc, aligned_alloc, memalign and posix_memalign implementation to satisfy their man-specified requirements. Modify allocator API implementation to bring it closer to other sanitizers allocators. Reviewers: dvyukov Subscribers: llvm-commits, kubamracek Differential Revision: https://reviews.llvm.org/D35690 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308929 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-24[mips] Switch asm to __asm__ for non-GNU compiles.Stephen Hines
Summary: Using asm works fine for gnu11, but fails if the compiler uses C11. Switch to the more consistent __asm__, since that is what the rest of the source is using. Reviewers: petarj Reviewed By: petarj Subscribers: llvm-commits, sdardis, arichardson, pirama Differential Revision: https://reviews.llvm.org/D35756 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308922 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-24Prefer atos to llvm-symbolizer on DarwinGeorge Karpenkov
atos is the default symbolizer on Apple's compiler for quite a few years now. llvm-symbolizer is quite fragile on Darwin: for example, unless a .dSYM file was explicitly generated symbolication would not work. It is also very convenient when the behavior of LLVM open source compiler matches to that of Apple's compiler on Apple's platform. Furthermore, llvm-symbolizer is not installed on Apple's platform by default, which leads to strange behavior during debugging: the test might fail under lit (where it has llvm-symbolizer) but would run properly when launched on the command line (where it does not, and atos would be used). Indeed, there's a downside: atos does not work properly with inlined functions, hence the test change. We do not think that this is a major problem, as users would often compile with -O0 when debugging, and in any case it is preferable to symbolizer not being able to symbolize. Differential Revision: https://reviews.llvm.org/D35745 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308908 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-24[scudo] Quarantine overhaulKostya Kortchinsky
Summary: First, some context. The main feedback we get about the quarantine is that it's too memory hungry. A single MB of quarantine will have an impact of 3 to 4MB of PSS/RSS, and things quickly get out of hand in terms of memory usage, and the quarantine ends up disabled. The main objective of the quarantine is to protect from use-after-free exploitation by making it harder for an attacker to reallocate a controlled chunk in place of the targeted freed chunk. This is achieved by not making it available to the backend right away for reuse, but holding it a little while. Historically, what has usually been the target of such attacks was objects, where vtable pointers or other function pointers could constitute a valuable targeti to replace. Those are usually on the smaller side. There is barely any advantage in putting the quarantine several megabytes of RGB data or the like. Now for the patch. This patch introduces a new way the Quarantine behaves in Scudo. First of all, the size of the Quarantine will be defined in KB instead of MB, then we introduce a new option: the size up to which (lower than or equal to) a chunk will be quarantined. This way, we only quarantine smaller chunks, and the size of the quarantine remains manageable. It also prevents someone from triggering a recycle by allocating something huge. We default to 512 bytes on 32-bit and 2048 bytes on 64-bit platforms. In details, the patches includes the following: - introduce `QuarantineSizeKb`, but honor `QuarantineSizeMb` if set to fall back to the old behavior (meaning no threshold in that case); `QuarantineSizeMb` is described as deprecated in the options descriptios; documentation update will follow; - introduce `QuarantineChunksUpToSize`, the new threshold value; - update the `quarantine.cpp` test, and other tests using `QuarantineSizeMb`; - remove `AllocatorOptions::copyTo`, it wasn't used; - slightly change the logic around `quarantineOrDeallocateChunk` to accomodate for the new logic; rename a couple of variables there as well; Rewriting the tests, I found a somewhat annoying bug where non-default aligned chunks would account for more than needed when placed in the quarantine due to `<< MinAlignment` instead of `<< MinAlignmentLog`. This is fixed and tested for now. Reviewers: alekseyshl, kcc Reviewed By: alekseyshl Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D35694 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308884 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-24[compiler-rt] Add missing const specifier to MemoryMappedSegment functionsFrancis Ricci
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308881 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-22[sanitizer_common] Move filesystem-related code out of sanitizer_common.ccVitaly Buka
Summary: This is a pure refactoring change. It just moves code that is related to filesystem operations from sanitizer_common.{cc,h} to sanitizer_file.{cc,h}. This makes it cleaner to disable the filesystem-related code for a new port that doesn't want it. Submitted on behalf of Roland McGrath. Reviewers: kcc, eugenis, alekseyshl Reviewed By: alekseyshl Subscribers: vitalybuka, llvm-commits, kubamracek, mgorny, phosek Tags: #sanitizers Differential Revision: https://reviews.llvm.org/D35591 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308819 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-21Remove Bitrig: CompilerRT ChangesErich Keane
Bitrig code has been merged back to OpenBSD, thus the OS has been abandoned. Differential Revision: https://reviews.llvm.org/D35709 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308798 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-20Revert "Add MemoryMappedSection struct for two-level memory map iteration"Francis Ricci
This probably broke lib0 tsan unit test on 10.11 buildbots This reverts commit 35ad307c385e384f47a7fb348c14b3602d3a33c4. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308676 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-20[compiler-rt] Use NOINLE to shrink stack framesVitaly Buka
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308654 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-20[compiler-rt] Reorder functions to shrink stack framesVitaly Buka
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308652 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-20Revert "[compiler-rt] Reorder functions to have smaller stack frames"Vitaly Buka
Does not compile. This reverts commit r308650. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308651 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-20[compiler-rt] Reorder functions to have smaller stack framesVitaly Buka
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308650 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-20Revert "[sanitizer_common] Move filesystem-related code out of ↵Vitaly Buka
sanitizer_common.cc" Breaks Windows build. This reverts commit r308640. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308648 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-20Add MemoryMappedSection struct for two-level memory map iterationFrancis Ricci
Summary: This will allow sanitizer_procmaps on mac to expose section information. Reviewers: kubamracek, alekseyshl, kcc Subscribers: llvm-commits, emaste Differential Revision: https://reviews.llvm.org/D35422 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308644 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-20[sanitizer_common] Move filesystem-related code out of sanitizer_common.ccAlex Shlyapnikov
This is a pure refactoring change. It just moves code that is related to filesystem operations from sanitizer_common.{cc,h} to sanitizer_file.{cc,h}. This makes it cleaner to disable the filesystem-related code for a new port that doesn't want it. Commiting for mcgrathr. Reviewers: alekseyshl Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D35591 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308640 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-20[compiler-rt] Include thread ID into sanitizers logsVitaly Buka
Reviewers: kcc, alekseyshl Subscribers: kubamracek, llvm-commits, dberris Differential Revision: https://reviews.llvm.org/D35654 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308637 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-20Honour 80-character line limitKamil Rytarowski
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308620 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-20Add NetBSD support in sanitizer_libignore.ccKamil Rytarowski
Summary: Reuse Linux, FreeBSD and Apple code - no NetBSD specific changes. Part of the code inspired by the original work on libsanitizer in GCC 5.4 by Christos Zoulas. Sponsored by <The NetBSD Foundation> Reviewers: joerg, vitalybuka, filcab, kcc Reviewed By: filcab Subscribers: emaste, kubamracek, llvm-commits Tags: #sanitizers Differential Revision: https://reviews.llvm.org/D35628 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308616 91177308-0d34-0410-b5e6-96231b3b80d8
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