[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

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@362138 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/runtime/CMakeLists.txt b/runtime/CMakeLists.txt
index e1e52b0e45229c3111740f694f35a8cdb94b3929..e20cc26f60af8625e1c52202b8c2132b5b3eff04 100644 (file)
--- a/runtime/CMakeLists.txt
+++ b/runtime/CMakeLists.txt
@@ -132,7 +132,7 @@ if(LLVM_BUILD_EXTERNAL_COMPILER_RT AND EXISTS ${COMPILER_RT_SRC_ROOT}/)
     # 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}