projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 00b86691 WN |
1 | /* |
| 2 | * llvm C frontend for perf. Support dynamically compile C file | |
| 3 | * | |
| 4 | * Inspired by clang example code: | |
| 5 | * http://llvm.org/svn/llvm-project/cfe/trunk/examples/clang-interpreter/main.cpp | |
| 6 | * | |
| 7 | * Copyright (C) 2016 Wang Nan <wangnan0@huawei.com> | |
| 8 | * Copyright (C) 2016 Huawei Inc. | |
| 9 | */ | |
| 10 | ||
| 11 | #include "clang/CodeGen/CodeGenAction.h" | |
| 12 | #include "clang/Frontend/CompilerInvocation.h" | |
| 13 | #include "clang/Frontend/CompilerInstance.h" | |
| 14 | #include "clang/Frontend/TextDiagnosticPrinter.h" | |
| 15 | #include "clang/Tooling/Tooling.h" | |
| 16 | #include "llvm/IR/Module.h" | |
| 17 | #include "llvm/Option/Option.h" | |
| 18 | #include "llvm/Support/ManagedStatic.h" | |
| 19 | #include <memory> | |
| 20 | ||
| 21 | #include "clang.h" | |
| 22 | #include "clang-c.h" | |
| 23 | ||
| 24 | namespace perf { | |
| 25 | ||
| 26 | static std::unique_ptr<llvm::LLVMContext> LLVMCtx; | |
| 27 | ||
| 28 | using namespace clang; | |
| 29 | ||
| 30 | static vfs::InMemoryFileSystem * | |
| 31 | buildVFS(StringRef& Name, StringRef& Content) | |
| 32 | { | |
| 33 | vfs::InMemoryFileSystem *VFS = new vfs::InMemoryFileSystem(true); | |
| 34 | VFS->addFile(Twine(Name), 0, llvm::MemoryBuffer::getMemBuffer(Content)); | |
| 35 | return VFS; | |
| 36 | } | |
| 37 | ||
| 38 | static CompilerInvocation * | |
| 39 | createCompilerInvocation(StringRef& Path, DiagnosticsEngine& Diags) | |
| 40 | { | |
| 41 | llvm::opt::ArgStringList CCArgs { | |
| 42 | "-cc1", | |
| 43 | "-triple", "bpf-pc-linux", | |
| 44 | "-fsyntax-only", | |
| 45 | "-ferror-limit", "19", | |
| 46 | "-fmessage-length", "127", | |
| 47 | "-O2", | |
| 48 | "-nostdsysteminc", | |
| 49 | "-nobuiltininc", | |
| 50 | "-vectorize-loops", | |
| 51 | "-vectorize-slp", | |
| 52 | "-Wno-unused-value", | |
| 53 | "-Wno-pointer-sign", | |
| 54 | "-x", "c"}; | |
| 55 | CompilerInvocation *CI = tooling::newInvocation(&Diags, CCArgs); | |
| 56 | ||
| 57 | FrontendOptions& Opts = CI->getFrontendOpts(); | |
| 58 | Opts.Inputs.clear(); | |
| 59 | Opts.Inputs.emplace_back(Path, IK_C); | |
| 60 | return CI; | |
| 61 | } | |
| 62 | ||
| 63 | std::unique_ptr<llvm::Module> | |
| 64 | getModuleFromSource(StringRef Name, StringRef Content) | |
| 65 | { | |
| 66 | CompilerInstance Clang; | |
| 67 | Clang.createDiagnostics(); | |
| 68 | ||
| 69 | IntrusiveRefCntPtr<vfs::FileSystem> VFS = buildVFS(Name, Content); | |
| 70 | Clang.setVirtualFileSystem(&*VFS); | |
| 71 | ||
| 72 | IntrusiveRefCntPtr<CompilerInvocation> CI = | |
| 73 | createCompilerInvocation(Name, Clang.getDiagnostics()); | |
| 74 | Clang.setInvocation(&*CI); | |
| 75 | ||
| 76 | std::unique_ptr<CodeGenAction> Act(new EmitLLVMOnlyAction(&*LLVMCtx)); | |
| 77 | if (!Clang.ExecuteAction(*Act)) | |
| 78 | return std::unique_ptr<llvm::Module>(nullptr); | |
| 79 | ||
| 80 | return Act->takeModule(); | |
| 81 | } | |
| 82 | ||
| 83 | } | |
| 84 | ||
| 85 | extern "C" { | |
| 86 | void perf_clang__init(void) | |
| 87 | { | |
| 88 | perf::LLVMCtx.reset(new llvm::LLVMContext()); | |
| 89 | } | |
| 90 | ||
| 91 | void perf_clang__cleanup(void) | |
| 92 | { | |
| 93 | perf::LLVMCtx.reset(nullptr); | |
| 94 | llvm::llvm_shutdown(); | |
| 95 | } | |
| 96 | } |