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Diffstat (limited to '')
| -rw-r--r-- | tools/perf/util/c++/clang.cpp | 216 |
1 files changed, 0 insertions, 216 deletions
diff --git a/tools/perf/util/c++/clang.cpp b/tools/perf/util/c++/clang.cpp deleted file mode 100644 index c8885dfa3667..000000000000 --- a/tools/perf/util/c++/clang.cpp +++ /dev/null @@ -1,216 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * 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 <wangnan0@huawei.com> - * Copyright (C) 2016 Huawei Inc. - */ - -#include "clang/Basic/Version.h" -#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/LegacyPassManager.h" -#include "llvm/IR/Module.h" -#include "llvm/Option/Option.h" -#include "llvm/Support/FileSystem.h" -#include "llvm/Support/ManagedStatic.h" -#include "llvm/Support/TargetRegistry.h" -#include "llvm/Support/TargetSelect.h" -#include "llvm/Target/TargetMachine.h" -#include "llvm/Target/TargetOptions.h" -#include <memory> - -#include "clang.h" -#include "clang-c.h" - -namespace perf { - -static std::unique_ptr<llvm::LLVMContext> LLVMCtx; - -using namespace clang; - -static CompilerInvocation * -createCompilerInvocation(llvm::opt::ArgStringList CFlags, 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"}; - - CCArgs.append(CFlags.begin(), CFlags.end()); - CompilerInvocation *CI = tooling::newInvocation(&Diags, CCArgs); - - FrontendOptions& Opts = CI->getFrontendOpts(); - Opts.Inputs.clear(); - Opts.Inputs.emplace_back(Path, - FrontendOptions::getInputKindForExtension("c")); - return CI; -} - -static std::unique_ptr<llvm::Module> -getModuleFromSource(llvm::opt::ArgStringList CFlags, - StringRef Path, IntrusiveRefCntPtr<vfs::FileSystem> VFS) -{ - CompilerInstance Clang; - Clang.createDiagnostics(); - -#if CLANG_VERSION_MAJOR < 9 - Clang.setVirtualFileSystem(&*VFS); -#else - Clang.createFileManager(&*VFS); -#endif - -#if CLANG_VERSION_MAJOR < 4 - IntrusiveRefCntPtr<CompilerInvocation> CI = - createCompilerInvocation(std::move(CFlags), Path, - Clang.getDiagnostics()); - Clang.setInvocation(&*CI); -#else - std::shared_ptr<CompilerInvocation> CI( - createCompilerInvocation(std::move(CFlags), Path, - Clang.getDiagnostics())); - Clang.setInvocation(CI); -#endif - - std::unique_ptr<CodeGenAction> Act(new EmitLLVMOnlyAction(&*LLVMCtx)); - if (!Clang.ExecuteAction(*Act)) - return std::unique_ptr<llvm::Module>(nullptr); - - return Act->takeModule(); -} - -std::unique_ptr<llvm::Module> -getModuleFromSource(llvm::opt::ArgStringList CFlags, - StringRef Name, StringRef Content) -{ - using namespace vfs; - - llvm::IntrusiveRefCntPtr<OverlayFileSystem> OverlayFS( - new OverlayFileSystem(getRealFileSystem())); - llvm::IntrusiveRefCntPtr<InMemoryFileSystem> MemFS( - new InMemoryFileSystem(true)); - - /* - * pushOverlay helps setting working dir for MemFS. Must call - * before addFile. - */ - OverlayFS->pushOverlay(MemFS); - MemFS->addFile(Twine(Name), 0, llvm::MemoryBuffer::getMemBuffer(Content)); - - return getModuleFromSource(std::move(CFlags), Name, OverlayFS); -} - -std::unique_ptr<llvm::Module> -getModuleFromSource(llvm::opt::ArgStringList CFlags, StringRef Path) -{ - IntrusiveRefCntPtr<vfs::FileSystem> VFS(vfs::getRealFileSystem()); - return getModuleFromSource(std::move(CFlags), Path, VFS); -} - -std::unique_ptr<llvm::SmallVectorImpl<char>> -getBPFObjectFromModule(llvm::Module *Module) -{ - using namespace llvm; - - std::string TargetTriple("bpf-pc-linux"); - std::string Error; - const Target* Target = TargetRegistry::lookupTarget(TargetTriple, Error); - if (!Target) { - llvm::errs() << Error; - return std::unique_ptr<llvm::SmallVectorImpl<char>>(nullptr); - } - - llvm::TargetOptions Opt; - TargetMachine *TargetMachine = - Target->createTargetMachine(TargetTriple, - "generic", "", - Opt, Reloc::Static); - - Module->setDataLayout(TargetMachine->createDataLayout()); - Module->setTargetTriple(TargetTriple); - - std::unique_ptr<SmallVectorImpl<char>> Buffer(new SmallVector<char, 0>()); - raw_svector_ostream ostream(*Buffer); - - legacy::PassManager PM; - bool NotAdded; -#if CLANG_VERSION_MAJOR < 7 - NotAdded = TargetMachine->addPassesToEmitFile(PM, ostream, - TargetMachine::CGFT_ObjectFile); -#else - NotAdded = TargetMachine->addPassesToEmitFile(PM, ostream, nullptr, - TargetMachine::CGFT_ObjectFile); -#endif - if (NotAdded) { - llvm::errs() << "TargetMachine can't emit a file of this type\n"; - return std::unique_ptr<llvm::SmallVectorImpl<char>>(nullptr); - } - PM.run(*Module); - - return Buffer; -} - -} - -extern "C" { -void perf_clang__init(void) -{ - perf::LLVMCtx.reset(new llvm::LLVMContext()); - LLVMInitializeBPFTargetInfo(); - LLVMInitializeBPFTarget(); - LLVMInitializeBPFTargetMC(); - LLVMInitializeBPFAsmPrinter(); -} - -void perf_clang__cleanup(void) -{ - perf::LLVMCtx.reset(nullptr); - llvm::llvm_shutdown(); -} - -int perf_clang__compile_bpf(const char *filename, - void **p_obj_buf, - size_t *p_obj_buf_sz) -{ - using namespace perf; - - if (!p_obj_buf || !p_obj_buf_sz) - return -EINVAL; - - llvm::opt::ArgStringList CFlags; - auto M = getModuleFromSource(std::move(CFlags), filename); - if (!M) - return -EINVAL; - auto O = getBPFObjectFromModule(&*M); - if (!O) - return -EINVAL; - - size_t size = O->size_in_bytes(); - void *buffer; - - buffer = malloc(size); - if (!buffer) - return -ENOMEM; - memcpy(buffer, O->data(), size); - *p_obj_buf = buffer; - *p_obj_buf_sz = size; - return 0; -} -} |