[XRay][compiler-rt] XRay Buffer Queue

Summary:
This implements a simple buffer queue to manage a pre-allocated queue of
fixed-sized buffers to hold XRay records. We need this to support
Flight Data Recorder (FDR) mode. We also implement this as a sub-library
first to allow for development before actually using it in an
implementation.

Some important properties of the buffer queue:

- Thread-safe enqueueing/dequeueing of fixed-size buffers.
- Pre-allocation of buffers at construction.

Reviewers: majnemer, rSerge, echristo

Subscribers: mehdi_amini, mgorny, llvm-commits

Differential Revision: https://reviews.llvm.org/D26232

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@287910 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 21 insertions, 0 deletions

diff --git a/test/xray/CMakeLists.txt b/test/xray/CMakeLists.txt
index e58032d03..f3382c1b7 100644
--- a/test/xray/CMakeLists.txt
+++ b/test/xray/CMakeLists.txt
@@ -35,6 +35,15 @@ if (COMPILER_RT_BUILD_XRAY AND COMPILER_RT_HAS_XRAY)
   endforeach()
 endif()
 
+# Add unit tests.
+if(COMPILER_RT_INCLUDE_TESTS)
+  configure_lit_site_cfg(
+    ${CMAKE_CURRENT_SOURCE_DIR}/Unit/lit.site.cfg.in
+    ${CMAKE_CURRENT_BINARY_DIR}/Unit/lit.site.cfg)
+  list(APPEND XRAY_TEST_DEPS XRayUnitTests)
+  list(APPEND XRAY_TESTSUITES ${CMAKE_CURRENT_BINARY_DIR}/Unit)
+endif()
+
 add_lit_testsuite(check-xray "Running the XRay tests"
   ${XRAY_TESTSUITES}
   DEPENDS ${XRAY_TEST_DEPS})
diff --git a/test/xray/Unit/lit.site.cfg.in b/test/xray/Unit/lit.site.cfg.in
new file mode 100644
index 000000000..1ebc7b9ec
--- /dev/null
+++ b/test/xray/Unit/lit.site.cfg.in
@@ -0,0 +1,12 @@
+@LIT_SITE_CFG_IN_HEADER@
+
+import os
+
+# Load common config for all compiler-rt unit tests.
+lit_config.load_config(config, "@COMPILER_RT_BINARY_DIR@/unittests/lit.common.unit.configured")
+
+# Setup config name.
+config.name = 'XRay-Unit'
+
+config.test_exec_root = "@COMPILER_RT_BINARY_DIR@/lib/xray/tests"
+config.test_source_root = config.test_exec_root