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

DEFINITIONS

1. __test__clang_to_IR
2. test__clang_to_IR
3. test__clang_to_obj

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "clang.h"
   3 #include "clang-c.h"
   4 extern "C" {
   5 #include "../util.h"
   6 }
   7 #include "llvm/IR/Function.h"
   8 #include "llvm/IR/LLVMContext.h"
   9 
  10 #include <tests/llvm.h>
  11 #include <string>
  12 
  13 class perf_clang_scope {
  14 public:
  15         explicit perf_clang_scope() {perf_clang__init();}
  16         ~perf_clang_scope() {perf_clang__cleanup();}
  17 };
  18 
  19 static std::unique_ptr<llvm::Module>
  20 __test__clang_to_IR(void)
  21 {
  22         unsigned int kernel_version;
  23 
  24         if (fetch_kernel_version(&kernel_version, NULL, 0))
  25                 return std::unique_ptr<llvm::Module>(nullptr);
  26 
  27         std::string cflag_kver("-DLINUX_VERSION_CODE=" +
  28                                 std::to_string(kernel_version));
  29 
  30         std::unique_ptr<llvm::Module> M =
  31                 perf::getModuleFromSource({cflag_kver.c_str()},
  32                                           "perf-test.c",
  33                                           test_llvm__bpf_base_prog);
  34         return M;
  35 }
  36 
  37 extern "C" {
  38 int test__clang_to_IR(void)
  39 {
  40         perf_clang_scope _scope;
  41 
  42         auto M = __test__clang_to_IR();
  43         if (!M)
  44                 return -1;
  45         for (llvm::Function& F : *M)
  46                 if (F.getName() == "bpf_func__SyS_epoll_pwait")
  47                         return 0;
  48         return -1;
  49 }
  50 
  51 int test__clang_to_obj(void)
  52 {
  53         perf_clang_scope _scope;
  54 
  55         auto M = __test__clang_to_IR();
  56         if (!M)
  57                 return -1;
  58 
  59         auto Buffer = perf::getBPFObjectFromModule(&*M);
  60         if (!Buffer)
  61                 return -1;
  62         return 0;
  63 }
  64 
  65 }