From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4E81263D0 for ; Thu, 25 Jul 2024 02:16:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.187 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721873781; cv=none; b=oooh5X8nCrQhIV2ofGbxg+6mc0DakVVnXD0jyBHd4wCeYkYpz8Pavrh23D2Nen7WjOtLbP+LWroBfn1LpNo7wgBxRbHdOEoz5JbRNtGI8KMQPnHn5DunDfwjqy7ClDsnqRjZbelrePyoxIzC6zN5sxOx/1bsNPhH/Y0AfO0emDM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721873781; c=relaxed/simple; bh=MKgoX7MBPsWSbi0jaZmoLefjothuAgU9N/qVCkTkg94=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=L7o/Spc/OlyiejXE4KFX6/3L6N4cGu8q0opDC4SzeVTbFhczdW9XFYXJ181zjHhOyLRXBCIH66XiBoc8ZI8gR4IEMUGnWEcTLyTd5CoM73b7sbzEbievWBdrrlMcc+/mSFgKBN/AlN8+BeS7Cy1HL9OkT54bNvbOmDuWJRyCzDg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.187 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.88.194]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4WTvdB0M5gzxTRJ; Thu, 25 Jul 2024 10:16:14 +0800 (CST) Received: from kwepemd100011.china.huawei.com (unknown [7.221.188.204]) by mail.maildlp.com (Postfix) with ESMTPS id 4058B1402CB; Thu, 25 Jul 2024 10:16:17 +0800 (CST) Received: from M910t.huawei.com (10.110.54.157) by kwepemd100011.china.huawei.com (7.221.188.204) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.34; Thu, 25 Jul 2024 10:16:15 +0800 From: Changbin Du To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Nathan Chancellor CC: Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , "Liang, Kan" , Nick Desaulniers , Bill Wendling , Justin Stitt , , , , Hui Wang , Changbin Du Subject: [PATCH v6 2/8] perf: disasm: refactor function dso__disassemble_filename Date: Thu, 25 Jul 2024 10:15:43 +0800 Message-ID: <20240725021549.880167-3-changbin.du@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240725021549.880167-1-changbin.du@huawei.com> References: <20240725021549.880167-1-changbin.du@huawei.com> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To kwepemd100011.china.huawei.com (7.221.188.204) To make change easy, this change refactors the dso__disassemble_filename() function by extracting two functions read_buildid_linkname() and fallback_filename(). Signed-off-by: Changbin Du --- v2: split refactoring from logical change. --- tools/perf/util/disasm.c | 117 +++++++++++++++++++++++---------------- 1 file changed, 70 insertions(+), 47 deletions(-) diff --git a/tools/perf/util/disasm.c b/tools/perf/util/disasm.c index 7e26d5215640..0ece6e06da6f 100644 --- a/tools/perf/util/disasm.c +++ b/tools/perf/util/disasm.c @@ -1092,28 +1092,12 @@ int symbol__strerror_disassemble(struct map_symbol *ms, int errnum, char *buf, s return 0; } -static int dso__disassemble_filename(struct dso *dso, char *filename, size_t filename_size) +static int read_buildid_linkname(char *filename, char *linkname, size_t linkname_size) { - char linkname[PATH_MAX]; - char *build_id_filename; char *build_id_path = NULL; char *pos; int len; - if (dso__symtab_type(dso) == DSO_BINARY_TYPE__KALLSYMS && - !dso__is_kcore(dso)) - return SYMBOL_ANNOTATE_ERRNO__NO_VMLINUX; - - build_id_filename = dso__build_id_filename(dso, NULL, 0, false); - if (build_id_filename) { - __symbol__join_symfs(filename, filename_size, build_id_filename); - free(build_id_filename); - } else { - if (dso__has_build_id(dso)) - return ENOMEM; - goto fallback; - } - build_id_path = strdup(filename); if (!build_id_path) return ENOMEM; @@ -1127,41 +1111,80 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil if (pos && strlen(pos) < SBUILD_ID_SIZE - 2) dirname(build_id_path); - if (dso__is_kcore(dso) || dso__is_vdso(dso)) - goto fallback; - - len = readlink(build_id_path, linkname, sizeof(linkname) - 1); - if (len < 0) - goto fallback; + len = readlink(build_id_path, linkname, linkname_size); + if (len < 0) { + free(build_id_path); + return -1; + } linkname[len] = '\0'; - if (strstr(linkname, DSO__NAME_KALLSYMS) || strstr(linkname, DSO__NAME_VDSO) || - access(filename, R_OK)) { -fallback: - /* - * If we don't have build-ids or the build-id file isn't in the - * cache, or is just a kallsyms file, well, lets hope that this - * DSO is the same as when 'perf record' ran. - */ - if ((dso__kernel(dso) || dso__is_vdso(dso)) && dso__long_name(dso)[0] == '/') - snprintf(filename, filename_size, "%s", dso__long_name(dso)); - else - __symbol__join_symfs(filename, filename_size, dso__long_name(dso)); - - mutex_lock(dso__lock(dso)); - if (access(filename, R_OK) && errno == ENOENT && dso__nsinfo(dso)) { - char *new_name = dso__filename_with_chroot(dso, filename); - if (new_name) { - strlcpy(filename, new_name, filename_size); - free(new_name); - } + free(build_id_path); + return 0; +} + +static int fallback_filename(struct dso *dso, char *filename, size_t filename_size) +{ + char filepath[PATH_MAX]; + + /* + * If we don't have build-ids or the build-id file isn't in the + * cache, or is just a kallsyms file, well, lets hope that this + * DSO is the same as when 'perf record' ran. + */ + if ((dso__kernel(dso) || dso__is_vdso(dso)) && dso__long_name(dso)[0] == '/') + snprintf(filepath, sizeof(filepath), "%s", dso__long_name(dso)); + else + __symbol__join_symfs(filepath, sizeof(filepath), dso__long_name(dso)); + + mutex_lock(dso__lock(dso)); + if (access(filepath, R_OK) && errno == ENOENT && dso__nsinfo(dso)) { + char *new_name = dso__filename_with_chroot(dso, filepath); + if (new_name) { + strlcpy(filepath, new_name, sizeof(filepath)); + free(new_name); } - mutex_unlock(dso__lock(dso)); - } else if (dso__binary_type(dso) == DSO_BINARY_TYPE__NOT_FOUND) { - dso__set_binary_type(dso, DSO_BINARY_TYPE__BUILD_ID_CACHE); } + mutex_unlock(dso__lock(dso)); - free(build_id_path); + if (access(filepath, R_OK) && errno == ENOENT) + return ENOENT; + + snprintf(filename, filename_size, "%s", filepath); + return 0; +} + +static int dso__disassemble_filename(struct dso *dso, char *filename, size_t filename_size) +{ + char linkname[PATH_MAX]; + char *build_id_filename; + + if (dso__symtab_type(dso) == DSO_BINARY_TYPE__KALLSYMS && + !dso__is_kcore(dso)) + return SYMBOL_ANNOTATE_ERRNO__NO_VMLINUX; + + build_id_filename = dso__build_id_filename(dso, NULL, 0, false); + if (build_id_filename) { + __symbol__join_symfs(filename, filename_size, build_id_filename); + free(build_id_filename); + } else { + if (dso__has_build_id(dso)) + return ENOMEM; + return fallback_filename(dso, filename, filename_size); + } + + if (access(filename, R_OK)) + return fallback_filename(dso, filename, filename_size); + + if (dso__is_kcore(dso) || dso__is_vdso(dso)) + return fallback_filename(dso, filename, filename_size); + + if (read_buildid_linkname(filename, linkname, sizeof(linkname) - 1) || + strstr(linkname, DSO__NAME_KALLSYMS) || strstr(linkname, DSO__NAME_VDSO)) { + return fallback_filename(dso, filename, filename_size); + } + + if (dso__binary_type(dso) == DSO_BINARY_TYPE__NOT_FOUND) + dso__set_binary_type(dso, DSO_BINARY_TYPE__BUILD_ID_CACHE); return 0; } -- 2.34.1