From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161189AbcIZH2g (ORCPT ); Mon, 26 Sep 2016 03:28:36 -0400 Received: from szxga03-in.huawei.com ([119.145.14.66]:7027 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161136AbcIZH23 (ORCPT ); Mon, 26 Sep 2016 03:28:29 -0400 From: Wang Nan To: , CC: , , , Wang Nan , Arnaldo Carvalho de Melo , Alexei Starovoitov , He Kuang , Jiri Olsa Subject: [PATCH v2 14/18] perf clang: Pass CFLAGS to builtin clang Date: Mon, 26 Sep 2016 07:27:08 +0000 Message-ID: <1474874832-134786-15-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1474874832-134786-1-git-send-email-wangnan0@huawei.com> References: <1474874832-134786-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020204.57E8CDFE.00C9,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-05-26 15:14:31, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 837fe09c139eb6457684c7545da0ebcb Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Pass -DKERNEL_VERSION_CODE, -D__NR_CPUS__, llvm.clang-opt config options and CFLAGS detected by kbuild detector to builtin clang so BPF scripts can use kernel headers and user defined options like external clang compiler. Test: # perf record --dry-run -e tools/perf/tests/bpf-script-test-kbuild.c ls 2>&1 | grep built bpf: builtin compiling successful Signed-off-by: Wang Nan Cc: Arnaldo Carvalho de Melo Cc: Alexei Starovoitov Cc: He Kuang Cc: Jiri Olsa --- tools/perf/util/c++/clang.cpp | 105 +++++++++++++++++++++++++++++++++++++-- tools/perf/util/llvm-utils-cxx.h | 14 ++++++ tools/perf/util/llvm-utils.h | 2 +- 3 files changed, 116 insertions(+), 5 deletions(-) create mode 100644 tools/perf/util/llvm-utils-cxx.h diff --git a/tools/perf/util/c++/clang.cpp b/tools/perf/util/c++/clang.cpp index 9597ff7..c1660ab 100644 --- a/tools/perf/util/c++/clang.cpp +++ b/tools/perf/util/c++/clang.cpp @@ -27,6 +27,8 @@ #include "clang.h" #include "clang-c.h" +#include "llvm-utils-cxx.h" +#include "util-cxx.h" namespace perf { @@ -152,6 +154,101 @@ getBPFObjectFromModule(llvm::Module *Module) return std::move(Buffer); } +class ClangOptions { + llvm::SmallString FileName; + llvm::SmallString<64> KVerDef; + llvm::SmallString<64> NRCpusDef; + char *kbuild_dir; + char *kbuild_include_opts; + char *clang_opt; +public: + ClangOptions(const char *filename) : FileName(filename), + KVerDef(""), + NRCpusDef(""), + kbuild_dir(NULL), + kbuild_include_opts(NULL), + clang_opt(NULL) + { + llvm::sys::fs::make_absolute(FileName); + + unsigned int kver; + if (!fetch_kernel_version(&kver, NULL, 0)) + KVerDef = "-DLINUX_VERSION_CODE=" + std::to_string(kver); + + int nr_cpus = llvm__get_nr_cpus(); + if (nr_cpus > 0) + NRCpusDef = "-D__NR_CPUS__=" + std::to_string(nr_cpus); + + if (llvm_param.clang_opt) + clang_opt = strdup(llvm_param.clang_opt); + + llvm__get_kbuild_opts(&kbuild_dir, &kbuild_include_opts); + if (!kbuild_dir || !kbuild_include_opts) { + free(kbuild_dir); + free(kbuild_include_opts); + kbuild_dir = kbuild_include_opts = NULL; + } + } + + ~ClangOptions() + { + free(kbuild_dir); + free(kbuild_include_opts); + free(clang_opt); + } + + static void fillCFlagsFromString(opt::ArgStringList &CFlags, char *s, bool check = false) + { + if (!s) + return; + + SmallVector Terms; + StringRef Opts(s); + Opts.split(Terms, ' '); + + for (auto i = Terms.begin(); i != Terms.end(); i++) + s[i->end() - Opts.begin()] = '\0'; + + for (auto i = Terms.begin(); i != Terms.end(); i++) { + if (!check) { + CFlags.push_back(i->begin()); + continue; + } + + if (i->startswith("-I")) + CFlags.push_back(i->begin()); + else if (i->startswith("-D")) + CFlags.push_back(i->begin()); + else if (*i == "-include") { + CFlags.push_back((i++)->begin()); + /* Let clang report this error */ + if (i == Terms.end()) + break; + CFlags.push_back(i->begin()); + } + } + } + + void getCFlags(opt::ArgStringList &CFlags) + { + CFlags.push_back(KVerDef.c_str()); + CFlags.push_back(NRCpusDef.c_str()); + + fillCFlagsFromString(CFlags, clang_opt); + fillCFlagsFromString(CFlags, kbuild_include_opts, true); + + if (kbuild_dir) { + CFlags.push_back("-working-directory"); + CFlags.push_back(kbuild_dir); + } + } + + const char *getFileName(void) + { + return FileName.c_str(); + } +}; + } extern "C" { @@ -175,11 +272,11 @@ int perf_clang__compile_bpf(const char *_filename, if (!p_obj_buf || !p_obj_buf_sz) return -EINVAL; - llvm::SmallString FileName(_filename); - llvm::sys::fs::make_absolute(FileName); - + ClangOptions Opts(_filename); llvm::opt::ArgStringList CFlags; - auto M = getModuleFromSource(std::move(CFlags), FileName.data()); + + Opts.getCFlags(CFlags); + auto M = getModuleFromSource(std::move(CFlags), Opts.getFileName()); if (!M) return -EINVAL; auto O = getBPFObjectFromModule(&*M); diff --git a/tools/perf/util/llvm-utils-cxx.h b/tools/perf/util/llvm-utils-cxx.h new file mode 100644 index 0000000..1202230 --- /dev/null +++ b/tools/perf/util/llvm-utils-cxx.h @@ -0,0 +1,14 @@ +#ifndef PERF_UTIL_LLVM_UTILS_CXX_H +#define PERF_UTIL_LLVM_UTILS_CXX_H + +#ifdef __cplusplus +extern "C" { +#endif + +#include "llvm-utils.h" + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/tools/perf/util/llvm-utils.h b/tools/perf/util/llvm-utils.h index 8a7d588..fbc7a8b 100644 --- a/tools/perf/util/llvm-utils.h +++ b/tools/perf/util/llvm-utils.h @@ -5,7 +5,7 @@ #ifndef __LLVM_UTILS_H #define __LLVM_UTILS_H -#include "debug.h" +#include struct llvm_param { /* Path of clang executable */ -- 1.8.3.4