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perf clang: Update test case to use real BPF script

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

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Joe Stringer <joe@ovn.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/20161126070354.141764-14-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2016-11-26 07:03:37 +00:00 committed by Arnaldo Carvalho de Melo
parent a9495fe9dc
commit e67d52d411
4 changed files with 62 additions and 15 deletions
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27
tools/perf/Makefile.config
View File

@ -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

7
tools/perf/tests/llvm.h
View File

@ -1,6 +1,10 @@
#ifndef PERF_TEST_LLVM_H
#define PERF_TEST_LLVM_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stddef.h> /* for size_t */
#include <stdbool.h> /* for bool */
@ -20,4 +24,7 @@ enum test_llvm__testcase {
int test_llvm__fetch_bpf_obj(void **p_obj_buf, size_t *p_obj_buf_sz,
enum test_llvm__testcase index, bool force,
bool *should_load_fail);
#ifdef __cplusplus
}
#endif
#endif

17
tools/perf/util/c++/clang-test.cpp
View File

@ -3,6 +3,10 @@
#include "llvm/IR/Function.h"
#include "llvm/IR/LLVMContext.h"
#include <util-cxx.h>
#include <tests/llvm.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;
}

26
tools/perf/util/util-cxx.h Normal file
View File

@ -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