[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

1 files changed, 38 insertions, 17 deletions

diff --git a/lib/xray/CMakeLists.txt b/lib/xray/CMakeLists.txt
index bab84d835..9c7cf6ce3 100644
--- a/lib/xray/CMakeLists.txt
+++ b/lib/xray/CMakeLists.txt
@@ -1,11 +1,15 @@
 # Build for the XRay runtime support library.
 
+# Core XRay runtime library implementation files.
 set(XRAY_SOURCES
   xray_init.cc
   xray_interface.cc
   xray_flags.cc
-  xray_inmemory_log.cc
-)
+  xray_inmemory_log.cc)
+
+# XRay flight data recorder (FDR) implementation files.
+set(XRAY_FDR_SOURCES
+  xray_buffer_queue.cc)
 
 set(x86_64_SOURCES
     xray_x86_64.cc
@@ -28,31 +32,48 @@ include_directories(..)
 include_directories(../../include)
 
 set(XRAY_CFLAGS ${SANITIZER_COMMON_CFLAGS})
-
 set(XRAY_COMMON_DEFINITIONS XRAY_HAS_EXCEPTIONS=1)
 append_list_if(
   COMPILER_RT_HAS_XRAY_COMPILER_FLAG XRAY_SUPPORTED=1 XRAY_COMMON_DEFINITIONS)
 
 add_compiler_rt_object_libraries(RTXray
-    ARCHS ${XRAY_SUPPORTED_ARCH}
-    SOURCES ${XRAY_SOURCES} CFLAGS ${XRAY_CFLAGS}
-    DEFS ${XRAY_COMMON_DEFINITIONS})
+  ARCHS ${XRAY_SUPPORTED_ARCH}
+  SOURCES ${XRAY_SOURCES} CFLAGS ${XRAY_CFLAGS}
+  DEFS ${XRAY_COMMON_DEFINITIONS})
+
+add_compiler_rt_object_libraries(RTXrayFDR
+  ARCHS ${XRAY_SUPPORTED_ARCH}
+  SOURCES ${XRAY_FDR_SOURCES} CFLAGS ${XRAY_CFLAGS}
+  DEFS ${XRAY_COMMON_DEFINITIONS})
 
 add_compiler_rt_component(xray)
+add_compiler_rt_component(xray-fdr)
 
 set(XRAY_COMMON_RUNTIME_OBJECT_LIBS
     RTSanitizerCommon
     RTSanitizerCommonLibc)
 
-foreach (arch ${XRAY_SUPPORTED_ARCH})
-    if (CAN_TARGET_${arch})
-        add_compiler_rt_runtime(clang_rt.xray
-            STATIC
-            ARCHS ${arch}
-            SOURCES ${${arch}_SOURCES}
-            CFLAGS ${XRAY_CFLAGS}
-            DEFS ${XRAY_COMMON_DEFINITIONS}
-            OBJECT_LIBS ${XRAY_COMMON_RUNTIME_OBJECT_LIBS}
-            PARENT_TARGET xray)
-    endif ()
+foreach(arch ${XRAY_SUPPORTED_ARCH})
+  if(CAN_TARGET_${arch})
+    add_compiler_rt_runtime(clang_rt.xray
+     STATIC
+     ARCHS ${arch}
+     SOURCES ${${arch}_SOURCES}
+     CFLAGS ${XRAY_CFLAGS}
+     DEFS ${XRAY_COMMON_DEFINITIONS}
+     OBJECT_LIBS ${XRAY_COMMON_RUNTIME_OBJECT_LIBS}
+     PARENT_TARGET xray)
+   add_compiler_rt_runtime(clang_rt.xray-fdr
+     STATIC
+     ARCHS ${arch}
+     SOURCES ${XRAY_FDR_SOURCES}
+     CFLAGS ${XRAY_CFLAGS}
+     DEFS ${XRAY_COMMON_DEFINITIONS}
+     OBJECT_LIBS ${XRAY_COMMON_RUNTIME_OBJECT_LIBS}
+     PARENT_TARGET xray-fdr)
+  endif()
 endforeach()
+
+if(COMPILER_RT_INCLUDE_TESTS)
+  add_subdirectory(tests)
+endif()