tools/perf/tests/llvm.c

   1 #include <stdio.h>
   2 #include <bpf/libbpf.h>
   3 #include <util/llvm-utils.h>
   4 #include <util/cache.h>
   5 #include "tests.h"
   6 #include "debug.h"
   7
   8 static int perf_config_cb(const char *var, const char *val,
   9                           void *arg __maybe_unused)
  10 {
  11         return perf_default_config(var, val, arg);
  12 }
  13
  14 /*
  15  * Randomly give it a "version" section since we don't really load it
  16  * into kernel
  17  */
  18 static const char test_bpf_prog[] =
  19         "__attribute__((section(\"do_fork\"), used)) "
  20         "int fork(void *ctx) {return 0;} "
  21         "char _license[] __attribute__((section(\"license\"), used)) = \"GPL\";"
  22         "int _version __attribute__((section(\"version\"), used)) = 0x40100;";
  23
  24 #ifdef HAVE_LIBBPF_SUPPORT
  25 static int test__bpf_parsing(void *obj_buf, size_t obj_buf_sz)
  26 {
  27         struct bpf_object *obj;
  28
  29         obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, NULL);
  30         if (!obj)
  31                 return -1;
  32         bpf_object__close(obj);
  33         return 0;
  34 }
  35 #else
  36 static int test__bpf_parsing(void *obj_buf __maybe_unused,
  37                              size_t obj_buf_sz __maybe_unused)
  38 {
  39         fprintf(stderr, " (skip bpf parsing)");
  40         return 0;
  41 }
  42 #endif
  43
  44 int test__llvm(void)
  45 {
  46         char *tmpl_new, *clang_opt_new;
  47         void *obj_buf;
  48         size_t obj_buf_sz;
  49         int err, old_verbose;
  50
  51         perf_config(perf_config_cb, NULL);
  52
  53         /*
  54          * Skip this test if user's .perfconfig doesn't set [llvm] section
  55          * and clang is not found in $PATH, and this is not perf test -v
  56          */
  57         if (verbose == 0 && !llvm_param.user_set_param && llvm__search_clang()) {
  58                 fprintf(stderr, " (no clang, try 'perf test -v LLVM')");
  59                 return TEST_SKIP;
  60         }
  61
  62         old_verbose = verbose;
  63         /*
  64          * llvm is verbosity when error. Suppress all error output if
  65          * not 'perf test -v'.
  66          */
  67         if (verbose == 0)
  68                 verbose = -1;
  69
  70         if (!llvm_param.clang_bpf_cmd_template)
  71                 return -1;
  72
  73         if (!llvm_param.clang_opt)
  74                 llvm_param.clang_opt = strdup("");
  75
  76         err = asprintf(&tmpl_new, "echo '%s' | %s", test_bpf_prog,
  77                        llvm_param.clang_bpf_cmd_template);
  78         if (err < 0)
  79                 return -1;
  80         err = asprintf(&clang_opt_new, "-xc %s", llvm_param.clang_opt);
  81         if (err < 0)
  82                 return -1;
  83
  84         llvm_param.clang_bpf_cmd_template = tmpl_new;
  85         llvm_param.clang_opt = clang_opt_new;
  86         err = llvm__compile_bpf("-", &obj_buf, &obj_buf_sz);
  87
  88         verbose = old_verbose;
  89         if (err) {
  90                 if (!verbose)
  91                         fprintf(stderr, " (use -v to see error message)");
  92                 return -1;
  93         }
  94
  95         err = test__bpf_parsing(obj_buf, obj_buf_sz);
  96         free(obj_buf);
  97         return err;
  98 }