From 00b86691c77c6576861b82a3cfe4d609800758fe Mon Sep 17 00:00:00 2001 From: Wang Nan Date: Sat, 26 Nov 2016 07:03:34 +0000 Subject: perf clang: Add builtin clang support ant test case Add basic clang support in clang.cpp and test__clang() testcase. The first testcase checks if builtin clang is able to generate LLVM IR. tests/clang.c is a proxy. Real testcase resides in utils/c++/clang-test.cpp in c++ and exports C interface to perf test subsystem. Test result: $ perf test -v clang 51: builtin clang support : 51.1: Test builtin clang compile C source to IR : --- start --- test child forked, pid 13215 test child finished with 0 ---- end ---- Test builtin clang support subtest 0: Ok Committer note: Make sure you've enabled CLANG and LLVM builtin support by setting the LIBCLANGLLVM variable on the make command line, e.g.: make LIBCLANGLLVM=1 O=/tmp/build/perf -C tools/perf install-bin Otherwise you'll get this when trying to do the 'perf test' call above: # perf test clang 51: builtin clang support : Skip (not compiled in) # Signed-off-by: Wang Nan Tested-by: Arnaldo Carvalho de Melo Cc: Alexei Starovoitov Cc: He Kuang Cc: Jiri Olsa Cc: Joe Stringer Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/20161126070354.141764-11-wangnan0@huawei.com [ Removed "Test" from descriptions, redundant and already removed from all the other entries ] Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/c++/Build | 2 + tools/perf/util/c++/clang-c.h | 16 +++++++ tools/perf/util/c++/clang-test.cpp | 31 ++++++++++++ tools/perf/util/c++/clang.cpp | 96 ++++++++++++++++++++++++++++++++++++++ tools/perf/util/c++/clang.h | 16 +++++++ 5 files changed, 161 insertions(+) create mode 100644 tools/perf/util/c++/Build create mode 100644 tools/perf/util/c++/clang-c.h create mode 100644 tools/perf/util/c++/clang-test.cpp create mode 100644 tools/perf/util/c++/clang.cpp create mode 100644 tools/perf/util/c++/clang.h (limited to 'tools/perf/util/c++') diff --git a/tools/perf/util/c++/Build b/tools/perf/util/c++/Build new file mode 100644 index 0000000..988fef1 --- /dev/null +++ b/tools/perf/util/c++/Build @@ -0,0 +1,2 @@ +libperf-$(CONFIG_CLANGLLVM) += clang.o +libperf-$(CONFIG_CLANGLLVM) += clang-test.o diff --git a/tools/perf/util/c++/clang-c.h b/tools/perf/util/c++/clang-c.h new file mode 100644 index 0000000..dcde4b5 --- /dev/null +++ b/tools/perf/util/c++/clang-c.h @@ -0,0 +1,16 @@ +#ifndef PERF_UTIL_CLANG_C_H +#define PERF_UTIL_CLANG_C_H + +#ifdef __cplusplus +extern "C" { +#endif + +extern void perf_clang__init(void); +extern void perf_clang__cleanup(void); + +extern int test__clang_to_IR(void); + +#ifdef __cplusplus +} +#endif +#endif diff --git a/tools/perf/util/c++/clang-test.cpp b/tools/perf/util/c++/clang-test.cpp new file mode 100644 index 0000000..3da6bfa --- /dev/null +++ b/tools/perf/util/c++/clang-test.cpp @@ -0,0 +1,31 @@ +#include "clang.h" +#include "clang-c.h" +#include "llvm/IR/Function.h" +#include "llvm/IR/LLVMContext.h" + +class perf_clang_scope { +public: + explicit perf_clang_scope() {perf_clang__init();} + ~perf_clang_scope() {perf_clang__cleanup();} +}; + +extern "C" { + +int test__clang_to_IR(void) +{ + perf_clang_scope _scope; + + std::unique_ptr M = + perf::getModuleFromSource("perf-test.c", + "int myfunc(void) {return 1;}"); + + if (!M) + return -1; + + for (llvm::Function& F : *M) + if (F.getName() == "myfunc") + return 0; + return -1; +} + +} diff --git a/tools/perf/util/c++/clang.cpp b/tools/perf/util/c++/clang.cpp new file mode 100644 index 0000000..c17b117 --- /dev/null +++ b/tools/perf/util/c++/clang.cpp @@ -0,0 +1,96 @@ +/* + * llvm C frontend for perf. Support dynamically compile C file + * + * Inspired by clang example code: + * http://llvm.org/svn/llvm-project/cfe/trunk/examples/clang-interpreter/main.cpp + * + * Copyright (C) 2016 Wang Nan + * Copyright (C) 2016 Huawei Inc. + */ + +#include "clang/CodeGen/CodeGenAction.h" +#include "clang/Frontend/CompilerInvocation.h" +#include "clang/Frontend/CompilerInstance.h" +#include "clang/Frontend/TextDiagnosticPrinter.h" +#include "clang/Tooling/Tooling.h" +#include "llvm/IR/Module.h" +#include "llvm/Option/Option.h" +#include "llvm/Support/ManagedStatic.h" +#include + +#include "clang.h" +#include "clang-c.h" + +namespace perf { + +static std::unique_ptr LLVMCtx; + +using namespace clang; + +static vfs::InMemoryFileSystem * +buildVFS(StringRef& Name, StringRef& Content) +{ + vfs::InMemoryFileSystem *VFS = new vfs::InMemoryFileSystem(true); + VFS->addFile(Twine(Name), 0, llvm::MemoryBuffer::getMemBuffer(Content)); + return VFS; +} + +static CompilerInvocation * +createCompilerInvocation(StringRef& Path, DiagnosticsEngine& Diags) +{ + llvm::opt::ArgStringList CCArgs { + "-cc1", + "-triple", "bpf-pc-linux", + "-fsyntax-only", + "-ferror-limit", "19", + "-fmessage-length", "127", + "-O2", + "-nostdsysteminc", + "-nobuiltininc", + "-vectorize-loops", + "-vectorize-slp", + "-Wno-unused-value", + "-Wno-pointer-sign", + "-x", "c"}; + CompilerInvocation *CI = tooling::newInvocation(&Diags, CCArgs); + + FrontendOptions& Opts = CI->getFrontendOpts(); + Opts.Inputs.clear(); + Opts.Inputs.emplace_back(Path, IK_C); + return CI; +} + +std::unique_ptr +getModuleFromSource(StringRef Name, StringRef Content) +{ + CompilerInstance Clang; + Clang.createDiagnostics(); + + IntrusiveRefCntPtr VFS = buildVFS(Name, Content); + Clang.setVirtualFileSystem(&*VFS); + + IntrusiveRefCntPtr CI = + createCompilerInvocation(Name, Clang.getDiagnostics()); + Clang.setInvocation(&*CI); + + std::unique_ptr Act(new EmitLLVMOnlyAction(&*LLVMCtx)); + if (!Clang.ExecuteAction(*Act)) + return std::unique_ptr(nullptr); + + return Act->takeModule(); +} + +} + +extern "C" { +void perf_clang__init(void) +{ + perf::LLVMCtx.reset(new llvm::LLVMContext()); +} + +void perf_clang__cleanup(void) +{ + perf::LLVMCtx.reset(nullptr); + llvm::llvm_shutdown(); +} +} diff --git a/tools/perf/util/c++/clang.h b/tools/perf/util/c++/clang.h new file mode 100644 index 0000000..f64483b --- /dev/null +++ b/tools/perf/util/c++/clang.h @@ -0,0 +1,16 @@ +#ifndef PERF_UTIL_CLANG_H +#define PERF_UTIL_CLANG_H + +#include "llvm/ADT/StringRef.h" +#include "llvm/IR/LLVMContext.h" +#include "llvm/IR/Module.h" +#include +namespace perf { + +using namespace llvm; + +std::unique_ptr +getModuleFromSource(StringRef Name, StringRef Content); + +} +#endif -- cgit v1.1