tools/perf/util/c++/clang-test.cpp

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "clang.h"
   3 #include "clang-c.h"
   4 #include "llvm/IR/Function.h"
   5 #include "llvm/IR/LLVMContext.h"
   6
   7 #include <util-cxx.h>
   8 #include <tests/llvm.h>
   9 #include <string>
  10
  11 class perf_clang_scope {
  12 public:
  13         explicit perf_clang_scope() {perf_clang__init();}
  14         ~perf_clang_scope() {perf_clang__cleanup();}
  15 };
  16
  17 static std::unique_ptr<llvm::Module>
  18 __test__clang_to_IR(void)
  19 {
  20         unsigned int kernel_version;
  21
  22         if (fetch_kernel_version(&kernel_version, NULL, 0))
  23                 return std::unique_ptr<llvm::Module>(nullptr);
  24
  25         std::string cflag_kver("-DLINUX_VERSION_CODE=" +
  26                                 std::to_string(kernel_version));
  27
  28         std::unique_ptr<llvm::Module> M =
  29                 perf::getModuleFromSource({cflag_kver.c_str()},
  30                                           "perf-test.c",
  31                                           test_llvm__bpf_base_prog);
  32         return M;
  33 }
  34
  35 extern "C" {
  36 int test__clang_to_IR(void)
  37 {
  38         perf_clang_scope _scope;
  39
  40         auto M = __test__clang_to_IR();
  41         if (!M)
  42                 return -1;
  43         for (llvm::Function& F : *M)
  44                 if (F.getName() == "bpf_func__SyS_epoll_wait")
  45                         return 0;
  46         return -1;
  47 }
  48
  49 int test__clang_to_obj(void)
  50 {
  51         perf_clang_scope _scope;
  52
  53         auto M = __test__clang_to_IR();
  54         if (!M)
  55                 return -1;
  56
  57         auto Buffer = perf::getBPFObjectFromModule(&*M);
  58         if (!Buffer)
  59                 return -1;
  60         return 0;
  61 }
  62
  63 }