[compiler-rt][XRay] re-submitting r276117, with fixes for build breakage due to extraneous and missing dependencies and attempts to build on unsupported OSes

Summary:
This is a fixed-up version of D21612, to address failure identified post-commit.

Original commit description:

This patch implements the initialisation and patching routines for the XRay runtime, along with the necessary trampolines for function entry/exit handling. For now we only define the basic hooks for allowing an implementation to define a handler that gets run on function entry/exit. We expose a minimal API for controlling the behaviour of the runtime (patching, cleanup, and setting the handler to invoke when instrumenting).

Fixes include:
- Gating XRay build to only Linux x86_64 and with the right dependencies in case it is the only library being built
- Including <cstddef> to fix std::size_t issue

Reviewers: kcc, rnk, echristo

Subscribers: mehdi_amini, llvm-commits

Differential Revision: https://reviews.llvm.org/D22611

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@276251 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 47 insertions, 0 deletions

diff --git a/lib/xray/CMakeLists.txt b/lib/xray/CMakeLists.txt
new file mode 100644
index 000000000..9b37a8ef8
--- /dev/null
+++ b/lib/xray/CMakeLists.txt
@@ -0,0 +1,47 @@
+# Build for the XRay runtime support library.
+
+set(XRAY_SOURCES
+  xray_init.cc
+	xray_interface.cc
+	xray_flags.cc
+)
+
+set(x86_64_SOURCES
+		xray_trampoline_x86.S
+		${XRAY_SOURCES})
+
+include_directories(..)
+include_directories(../../include)
+
+set(XRAY_CFLAGS ${SANITIZER_COMMON_CFLAGS})
+
+set(XRAY_COMMON_DEFINITIONS XRAY_HAS_EXCEPTIONS=1)
+
+add_compiler_rt_object_libraries(RTXray
+		ARCHS ${XRAY_SUPPORTED_ARCH}
+		SOURCES ${XRAY_SOURCES} CFLAGS ${XRAY_CFLAGS}
+		DEFS ${XRAY_COMMON_DEFINITIONS})
+
+add_custom_target(xray)
+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 ()
+endforeach()
+
+add_dependencies(compiler-rt xray)
+
+# if(COMPILER_RT_INCLUDE_TESTS)
+#   add_subdirectory(tests)
+# endif()