97 lines
2.3 KiB
C++
97 lines
2.3 KiB
C++
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/*
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* llvm C frontend for perf. Support dynamically compile C file
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*
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* Inspired by clang example code:
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* http://llvm.org/svn/llvm-project/cfe/trunk/examples/clang-interpreter/main.cpp
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*
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* Copyright (C) 2016 Wang Nan <wangnan0@huawei.com>
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* Copyright (C) 2016 Huawei Inc.
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*/
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#include "clang/CodeGen/CodeGenAction.h"
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#include "clang/Frontend/CompilerInvocation.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "clang/Frontend/TextDiagnosticPrinter.h"
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#include "clang/Tooling/Tooling.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Option/Option.h"
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#include "llvm/Support/ManagedStatic.h"
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#include <memory>
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#include "clang.h"
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#include "clang-c.h"
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namespace perf {
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static std::unique_ptr<llvm::LLVMContext> LLVMCtx;
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using namespace clang;
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static vfs::InMemoryFileSystem *
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buildVFS(StringRef& Name, StringRef& Content)
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{
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vfs::InMemoryFileSystem *VFS = new vfs::InMemoryFileSystem(true);
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VFS->addFile(Twine(Name), 0, llvm::MemoryBuffer::getMemBuffer(Content));
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return VFS;
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}
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static CompilerInvocation *
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createCompilerInvocation(StringRef& Path, DiagnosticsEngine& Diags)
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{
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llvm::opt::ArgStringList CCArgs {
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"-cc1",
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"-triple", "bpf-pc-linux",
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"-fsyntax-only",
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"-ferror-limit", "19",
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"-fmessage-length", "127",
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"-O2",
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"-nostdsysteminc",
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"-nobuiltininc",
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"-vectorize-loops",
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"-vectorize-slp",
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"-Wno-unused-value",
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"-Wno-pointer-sign",
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"-x", "c"};
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CompilerInvocation *CI = tooling::newInvocation(&Diags, CCArgs);
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FrontendOptions& Opts = CI->getFrontendOpts();
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Opts.Inputs.clear();
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Opts.Inputs.emplace_back(Path, IK_C);
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return CI;
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}
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std::unique_ptr<llvm::Module>
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getModuleFromSource(StringRef Name, StringRef Content)
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{
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CompilerInstance Clang;
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Clang.createDiagnostics();
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IntrusiveRefCntPtr<vfs::FileSystem> VFS = buildVFS(Name, Content);
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Clang.setVirtualFileSystem(&*VFS);
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IntrusiveRefCntPtr<CompilerInvocation> CI =
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createCompilerInvocation(Name, Clang.getDiagnostics());
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Clang.setInvocation(&*CI);
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std::unique_ptr<CodeGenAction> Act(new EmitLLVMOnlyAction(&*LLVMCtx));
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if (!Clang.ExecuteAction(*Act))
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return std::unique_ptr<llvm::Module>(nullptr);
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return Act->takeModule();
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}
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}
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extern "C" {
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void perf_clang__init(void)
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{
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perf::LLVMCtx.reset(new llvm::LLVMContext());
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}
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void perf_clang__cleanup(void)
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{
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perf::LLVMCtx.reset(nullptr);
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llvm::llvm_shutdown();
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}
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}
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