[PATCH 09/14] perf clang: Update test case to use real BPF script

[Wang Nan]

Allow C++ code to use util.h and tests/llvm.h. Let perf test
to compile a real BPF script.

Signed-off-by: Wang Nan <wangn...@huawei.com>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Alexei Starovoitov <a...@fb.com>
Cc: He Kuang <heku...@huawei.com>
Cc: Jiri Olsa <jo...@kernel.org>
---
 tools/perf/Makefile.config         | 27 +++++++++++++++------------
 tools/perf/tests/llvm-cxx.h        | 13 +++++++++++++
 tools/perf/util/c++/clang-test.cpp | 17 ++++++++++++++---
 tools/perf/util/util-cxx.h         | 26 ++++++++++++++++++++++++++
 4 files changed, 68 insertions(+), 15 deletions(-)
 create mode 100644 tools/perf/tests/llvm-cxx.h
 create mode 100644 tools/perf/util/util-cxx.h

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index d977d69..778623e 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -212,24 +212,27 @@ ifeq ($(DEBUG),0)
   endif
 endif
 
-CFLAGS += -I$(src-perf)/util/include
-CFLAGS += -I$(src-perf)/arch/$(ARCH)/include
-CFLAGS += -I$(srctree)/tools/include/uapi
-CFLAGS += -I$(srctree)/tools/include/
-CFLAGS += -I$(srctree)/tools/arch/$(ARCH)/include/uapi
-CFLAGS += -I$(srctree)/tools/arch/$(ARCH)/include/
-CFLAGS += -I$(srctree)/tools/arch/$(ARCH)/
+INC_FLAGS += -I$(src-perf)/util/include
+INC_FLAGS += -I$(src-perf)/arch/$(ARCH)/include
+INC_FLAGS += -I$(srctree)/tools/include/uapi
+INC_FLAGS += -I$(srctree)/tools/include/
+INC_FLAGS += -I$(srctree)/tools/arch/$(ARCH)/include/uapi
+INC_FLAGS += -I$(srctree)/tools/arch/$(ARCH)/include/
+INC_FLAGS += -I$(srctree)/tools/arch/$(ARCH)/
 
 # $(obj-perf)      for generated common-cmds.h
 # $(obj-perf)/util for generated bison/flex headers
 ifneq ($(OUTPUT),)
-CFLAGS += -I$(obj-perf)/util
-CFLAGS += -I$(obj-perf)
+INC_FLAGS += -I$(obj-perf)/util
+INC_FLAGS += -I$(obj-perf)
 endif
 
-CFLAGS += -I$(src-perf)/util
-CFLAGS += -I$(src-perf)
-CFLAGS += -I$(srctree)/tools/lib/
+INC_FLAGS += -I$(src-perf)/util
+INC_FLAGS += -I$(src-perf)
+INC_FLAGS += -I$(srctree)/tools/lib/
+
+CFLAGS   += $(INC_FLAGS)
+CXXFLAGS += $(INC_FLAGS)
 
 CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
 
diff --git a/tools/perf/tests/llvm-cxx.h b/tools/perf/tests/llvm-cxx.h
new file mode 100644
index 0000000..d9c98fa
--- /dev/null
+++ b/tools/perf/tests/llvm-cxx.h
@@ -0,0 +1,13 @@
+#ifndef PERF_TEST_LLVM_CXX_H
+#define PERF_TEST_LLVM_CXX_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "tests/llvm.h"
+
+#ifdef __cplusplus
+}
+#endif
+#endif
diff --git a/tools/perf/util/c++/clang-test.cpp 
b/tools/perf/util/c++/clang-test.cpp
index 0f484fb..c5546fd 100644
--- a/tools/perf/util/c++/clang-test.cpp
+++ b/tools/perf/util/c++/clang-test.cpp
@@ -3,6 +3,10 @@
 #include "llvm/IR/Function.h"
 #include "llvm/IR/LLVMContext.h"
 
+#include <util-cxx.h>
+#include <tests/llvm-cxx.h>
+#include <string>
+
 class perf_clang_scope {
 public:
        explicit perf_clang_scope() {perf_clang__init();}
@@ -14,17 +18,24 @@ extern "C" {
 int test__clang_to_IR(void)
 {
        perf_clang_scope _scope;
+       unsigned int kernel_version;
+
+       if (fetch_kernel_version(&kernel_version, NULL, 0))
+               return -1;
+
+       std::string cflag_kver("-DLINUX_VERSION_CODE=" +
+                               std::to_string(kernel_version));
 
        std::unique_ptr<llvm::Module> M =
-               perf::getModuleFromSource({"-DRESULT=1"},
+               perf::getModuleFromSource({cflag_kver.c_str()},
                                          "perf-test.c",
-                                         "int myfunc(void) {return RESULT;}");
+                                         test_llvm__bpf_base_prog);
 
        if (!M)
                return -1;
 
        for (llvm::Function& F : *M)
-               if (F.getName() == "myfunc")
+               if (F.getName() == "bpf_func__SyS_epoll_wait")
                        return 0;
        return -1;
 }
diff --git a/tools/perf/util/util-cxx.h b/tools/perf/util/util-cxx.h
new file mode 100644
index 0000000..0e0e019
--- /dev/null
+++ b/tools/perf/util/util-cxx.h
@@ -0,0 +1,26 @@
+/*
+ * Support C++ source use utilities defined in util.h
+ */
+
+#ifndef PERF_UTIL_UTIL_CXX_H
+#define PERF_UTIL_UTIL_CXX_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Now 'new' is the only C++ keyword found in util.h:
+ * in tools/include/linux/rbtree.h
+ *
+ * Other keywords, like class and delete, should be
+ * redefined if necessary.
+ */
+#define new _new
+#include "util.h"
+#undef new
+
+#ifdef __cplusplus
+}
+#endif
+#endif
-- 
1.8.3.4