r362138 - [GWP-ASan] Mutex implementation [2].

[Mitch Phillips via cfe-commits]

Author: hctim
Date: Thu May 30 12:45:32 2019
New Revision: 362138

URL: http://llvm.org/viewvc/llvm-project?rev=362138&view=rev
Log:
[GWP-ASan] Mutex implementation [2].

Summary:
See D60593 for further information.
This patch pulls out the mutex implementation and the required definitions file.

We implement our own mutex for GWP-ASan currently, because:

1. We must be compatible with the sum of the most restrictive elements of the supporting allocator's build system. Current targets for GWP-ASan include Scudo (on Linux and Fuchsia), and bionic (on Android).
2. Scudo specifies `-nostdlib++ -nonodefaultlibs`, meaning we can't use `std::mutex` or `mtx_t`.
3. We can't use `sanitizer_common`'s mutex, as the supporting allocators cannot afford the extra maintenance (Android, Fuchsia) and code size (Fuchsia) overheads that this would incur.

In future, we would like to implement a shared base mutex for GWP-ASan, Scudo and sanitizer_common. This will likely happen when both GWP-ASan and Scudo standalone are not in the development phase, at which point they will have stable requirements.

Reviewers: vlad.tsyrklevich, morehouse, jfb

Reviewed By: morehouse

Subscribers: dexonsmith, srhines, cfe-commits, kubamracek, mgorny, cryptoad, jfb, #sanitizers, llvm-commits, vitalybuka, eugenis

Tags: #sanitizers, #llvm, #clang

Differential Revision: https://reviews.llvm.org/D61923

Modified:
    cfe/trunk/runtime/CMakeLists.txt

Modified: cfe/trunk/runtime/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/runtime/CMakeLists.txt?rev=362138&r1=362137&r2=362138&view=diff
==============================================================================
--- cfe/trunk/runtime/CMakeLists.txt (original)
+++ cfe/trunk/runtime/CMakeLists.txt Thu May 30 12:45:32 2019
@@ -132,7 +132,7 @@ if(LLVM_BUILD_EXTERNAL_COMPILER_RT AND E
     # Add top-level targets for various compiler-rt test suites.
     set(COMPILER_RT_TEST_SUITES check-fuzzer check-asan check-hwasan check-asan-dynamic check-dfsan
       check-lsan check-msan check-sanitizer check-tsan check-ubsan check-ubsan-minimal
-      check-profile check-cfi check-cfi-and-supported check-safestack)
+      check-profile check-cfi check-cfi-and-supported check-safestack check-gwp_asan)
     foreach(test_suite ${COMPILER_RT_TEST_SUITES})
       get_ext_project_build_command(run_test_suite ${test_suite})
       add_custom_target(${test_suite}