text: #include <stdio.h>
  #include <bpf/libbpf.h>
  #include <util/llvm-utils.h>
  #include <util/cache.h>
  #include "llvm.h"
  #include "tests.h"
  #include "debug.h"
  #include "util.h"
  
  #ifdef HAVE_LIBBPF_SUPPORT
  static int test__bpf_parsing(void *obj_buf, size_t obj_buf_sz)
  {
  	struct bpf_object *obj;
  
  	obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, NULL);
  	if (IS_ERR(obj))
  		return TEST_FAIL;
  	bpf_object__close(obj);
  	return TEST_OK;
  }
  #else
  static int test__bpf_parsing(void *obj_buf __maybe_unused,
  			     size_t obj_buf_sz __maybe_unused)
  {
  	pr_debug("Skip bpf parsing\n");
  	return TEST_OK;
  }
  #endif
  
  static struct {
  	const char *source;
  	const char *desc;
  	bool should_load_fail;
  } bpf_source_table[__LLVM_TESTCASE_MAX] = {
  	[LLVM_TESTCASE_BASE] = {
  		.source = test_llvm__bpf_base_prog,
  		.desc = "Basic BPF llvm compiling test",
  	},
  	[LLVM_TESTCASE_KBUILD] = {
  		.source = test_llvm__bpf_test_kbuild_prog,
  		.desc = "Test kbuild searching",
  	},
  	[LLVM_TESTCASE_BPF_PROLOGUE] = {
  		.source = test_llvm__bpf_test_prologue_prog,
  		.desc = "Compile source for BPF prologue generation test",
  	},
  	[LLVM_TESTCASE_BPF_RELOCATION] = {
  		.source = test_llvm__bpf_test_relocation,
  		.desc = "Compile source for BPF relocation test",
  		.should_load_fail = true,
  	},
  };
  
  int
  test_llvm__fetch_bpf_obj(void **p_obj_buf,
  			 size_t *p_obj_buf_sz,
  			 enum test_llvm__testcase idx,
  			 bool force,
  			 bool *should_load_fail)
  {
  	const char *source;
  	const char *desc;
  	const char *tmpl_old, *clang_opt_old;
  	char *tmpl_new = NULL, *clang_opt_new = NULL;
  	int err, old_verbose, ret = TEST_FAIL;
  
  	if (idx >= __LLVM_TESTCASE_MAX)
  		return TEST_FAIL;
  
  	source = bpf_source_table[idx].source;
  	desc = bpf_source_table[idx].desc;
  	if (should_load_fail)
  		*should_load_fail = bpf_source_table[idx].should_load_fail;
  
  	/*
  	 * Skip this test if user's .perfconfig doesn't set [llvm] section
  	 * and clang is not found in $PATH, and this is not perf test -v
  	 */
  	if (!force && (verbose == 0 &&
  		       !llvm_param.user_set_param &&
  		       llvm__search_clang())) {
  		pr_debug("No clang and no verbosive, skip this test\n");
  		return TEST_SKIP;
  	}
  
  	/*
  	 * llvm is verbosity when error. Suppress all error output if
  	 * not 'perf test -v'.
  	 */
  	old_verbose = verbose;
  	if (verbose == 0)
  		verbose = -1;
  
  	*p_obj_buf = NULL;
  	*p_obj_buf_sz = 0;
  
  	if (!llvm_param.clang_bpf_cmd_template)
  		goto out;
  
  	if (!llvm_param.clang_opt)
  		llvm_param.clang_opt = strdup("");
  
  	err = asprintf(&tmpl_new, "echo '%s' | %s%s", source,
  		       llvm_param.clang_bpf_cmd_template,
  		       old_verbose ? "" : " 2>/dev/null");
  	if (err < 0)
  		goto out;
  	err = asprintf(&clang_opt_new, "-xc %s", llvm_param.clang_opt);
  	if (err < 0)
  		goto out;
  
  	tmpl_old = llvm_param.clang_bpf_cmd_template;
  	llvm_param.clang_bpf_cmd_template = tmpl_new;
  	clang_opt_old = llvm_param.clang_opt;
  	llvm_param.clang_opt = clang_opt_new;
  
  	err = llvm__compile_bpf("-", p_obj_buf, p_obj_buf_sz);
  
  	llvm_param.clang_bpf_cmd_template = tmpl_old;
  	llvm_param.clang_opt = clang_opt_old;
  
  	verbose = old_verbose;
  	if (err)
  		goto out;
  
  	ret = TEST_OK;
  out:
  	free(tmpl_new);
  	free(clang_opt_new);
  	if (ret != TEST_OK)
  		pr_debug("Failed to compile test case: '%s'\n", desc);
  	return ret;
  }
  
  int test__llvm(int subtest)
  {
  	int ret;
  	void *obj_buf = NULL;
  	size_t obj_buf_sz = 0;
  	bool should_load_fail = false;
  
  	if ((subtest < 0) || (subtest >= __LLVM_TESTCASE_MAX))
  		return TEST_FAIL;
  
  	ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
  				       subtest, false, &should_load_fail);
  
  	if (ret == TEST_OK && !should_load_fail) {
  		ret = test__bpf_parsing(obj_buf, obj_buf_sz);
  		if (ret != TEST_OK) {
  			pr_debug("Failed to parse test case '%s'\n",
  				 bpf_source_table[subtest].desc);
  		}
  	}
  	free(obj_buf);
  
  	return ret;
  }
  
  int test__llvm_subtest_get_nr(void)
  {
  	return __LLVM_TESTCASE_MAX;
  }
  
  const char *test__llvm_subtest_get_desc(int subtest)
  {
  	if ((subtest < 0) || (subtest >= __LLVM_TESTCASE_MAX))
  		return NULL;
  
  	return bpf_source_table[subtest].desc;
  }
  