tools/perf/tests/llvm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include "tests.h"
   6 #include "debug.h"
   7
   8 #ifdef HAVE_LIBBPF_SUPPORT
   9 #include <bpf/libbpf.h>
  10 #include <util/llvm-utils.h>
  11 #include "llvm.h"
  12 static int test__bpf_parsing(void *obj_buf, size_t obj_buf_sz)
  13 {
  14         struct bpf_object *obj;
  15
  16         obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, NULL);
  17         if (libbpf_get_error(obj))
  18                 return TEST_FAIL;
  19         bpf_object__close(obj);
  20         return TEST_OK;
  21 }
  22
  23 static struct {
  24         const char *source;
  25         const char *desc;
  26         bool should_load_fail;
  27 } bpf_source_table[__LLVM_TESTCASE_MAX] = {
  28         [LLVM_TESTCASE_BASE] = {
  29                 .source = test_llvm__bpf_base_prog,
  30                 .desc = "Basic BPF llvm compile",
  31         },
  32         [LLVM_TESTCASE_KBUILD] = {
  33                 .source = test_llvm__bpf_test_kbuild_prog,
  34                 .desc = "kbuild searching",
  35         },
  36         [LLVM_TESTCASE_BPF_PROLOGUE] = {
  37                 .source = test_llvm__bpf_test_prologue_prog,
  38                 .desc = "Compile source for BPF prologue generation",
  39         },
  40         [LLVM_TESTCASE_BPF_RELOCATION] = {
  41                 .source = test_llvm__bpf_test_relocation,
  42                 .desc = "Compile source for BPF relocation",
  43                 .should_load_fail = true,
  44         },
  45 };
  46
  47 int
  48 test_llvm__fetch_bpf_obj(void **p_obj_buf,
  49                          size_t *p_obj_buf_sz,
  50                          enum test_llvm__testcase idx,
  51                          bool force,
  52                          bool *should_load_fail)
  53 {
  54         const char *source;
  55         const char *desc;
  56         const char *tmpl_old, *clang_opt_old;
  57         char *tmpl_new = NULL, *clang_opt_new = NULL;
  58         int err, old_verbose, ret = TEST_FAIL;
  59
  60         if (idx >= __LLVM_TESTCASE_MAX)
  61                 return TEST_FAIL;
  62
  63         source = bpf_source_table[idx].source;
  64         desc = bpf_source_table[idx].desc;
  65         if (should_load_fail)
  66                 *should_load_fail = bpf_source_table[idx].should_load_fail;
  67
  68         /*
  69          * Skip this test if user's .perfconfig doesn't set [llvm] section
  70          * and clang is not found in $PATH, and this is not perf test -v
  71          */
  72         if (!force && (verbose <= 0 &&
  73                        !llvm_param.user_set_param &&
  74                        llvm__search_clang())) {
  75                 pr_debug("No clang and no verbosive, skip this test\n");
  76                 return TEST_SKIP;
  77         }
  78
  79         /*
  80          * llvm is verbosity when error. Suppress all error output if
  81          * not 'perf test -v'.
  82          */
  83         old_verbose = verbose;
  84         if (verbose == 0)
  85                 verbose = -1;
  86
  87         *p_obj_buf = NULL;
  88         *p_obj_buf_sz = 0;
  89
  90         if (!llvm_param.clang_bpf_cmd_template)
  91                 goto out;
  92
  93         if (!llvm_param.clang_opt)
  94                 llvm_param.clang_opt = strdup("");
  95
  96         err = asprintf(&tmpl_new, "echo '%s' | %s%s", source,
  97                        llvm_param.clang_bpf_cmd_template,
  98                        old_verbose ? "" : " 2>/dev/null");
  99         if (err < 0)
 100                 goto out;
 101         err = asprintf(&clang_opt_new, "-xc %s", llvm_param.clang_opt);
 102         if (err < 0)
 103                 goto out;
 104
 105         tmpl_old = llvm_param.clang_bpf_cmd_template;
 106         llvm_param.clang_bpf_cmd_template = tmpl_new;
 107         clang_opt_old = llvm_param.clang_opt;
 108         llvm_param.clang_opt = clang_opt_new;
 109
 110         err = llvm__compile_bpf("-", p_obj_buf, p_obj_buf_sz);
 111
 112         llvm_param.clang_bpf_cmd_template = tmpl_old;
 113         llvm_param.clang_opt = clang_opt_old;
 114
 115         verbose = old_verbose;
 116         if (err)
 117                 goto out;
 118
 119         ret = TEST_OK;
 120 out:
 121         free(tmpl_new);
 122         free(clang_opt_new);
 123         if (ret != TEST_OK)
 124                 pr_debug("Failed to compile test case: '%s'\n", desc);
 125         return ret;
 126 }
 127
 128 int test__llvm(struct test *test __maybe_unused, int subtest)
 129 {
 130         int ret;
 131         void *obj_buf = NULL;
 132         size_t obj_buf_sz = 0;
 133         bool should_load_fail = false;
 134
 135         if ((subtest < 0) || (subtest >= __LLVM_TESTCASE_MAX))
 136                 return TEST_FAIL;
 137
 138         ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
 139                                        subtest, false, &should_load_fail);
 140
 141         if (ret == TEST_OK && !should_load_fail) {
 142                 ret = test__bpf_parsing(obj_buf, obj_buf_sz);
 143                 if (ret != TEST_OK) {
 144                         pr_debug("Failed to parse test case '%s'\n",
 145                                  bpf_source_table[subtest].desc);
 146                 }
 147         }
 148         free(obj_buf);
 149
 150         return ret;
 151 }
 152
 153 int test__llvm_subtest_get_nr(void)
 154 {
 155         return __LLVM_TESTCASE_MAX;
 156 }
 157
 158 const char *test__llvm_subtest_get_desc(int subtest)
 159 {
 160         if ((subtest < 0) || (subtest >= __LLVM_TESTCASE_MAX))
 161                 return NULL;
 162
 163         return bpf_source_table[subtest].desc;
 164 }
 165 #else //HAVE_LIBBPF_SUPPORT
 166 int test__llvm(struct test *test __maybe_unused, int subtest __maybe_unused)
 167 {
 168         return TEST_SKIP;
 169 }
 170
 171 int test__llvm_subtest_get_nr(void)
 172 {
 173         return 0;
 174 }
 175
 176 const char *test__llvm_subtest_get_desc(int subtest __maybe_unused)
 177 {
 178         return NULL;
 179 }
 180 #endif // HAVE_LIBBPF_SUPPORT