forked from Minki/linux
a9495fe9dc
Improve getModuleFromSource() API to accept a cflags list. This feature will be used to pass LINUX_VERSION_CODE and -I flags. Signed-off-by: Wang Nan <wangnan0@huawei.com> Cc: Alexei Starovoitov <ast@fb.com> Cc: He Kuang <hekuang@huawei.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Joe Stringer <joe@ovn.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/20161126070354.141764-13-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
122 lines
3.0 KiB
C++
122 lines
3.0 KiB
C++
/*
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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/FileSystem.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 CompilerInvocation *
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createCompilerInvocation(llvm::opt::ArgStringList CFlags, StringRef& Path,
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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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CCArgs.append(CFlags.begin(), CFlags.end());
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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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static std::unique_ptr<llvm::Module>
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getModuleFromSource(llvm::opt::ArgStringList CFlags,
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StringRef Path, IntrusiveRefCntPtr<vfs::FileSystem> VFS)
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{
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CompilerInstance Clang;
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Clang.createDiagnostics();
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Clang.setVirtualFileSystem(&*VFS);
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IntrusiveRefCntPtr<CompilerInvocation> CI =
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createCompilerInvocation(std::move(CFlags), Path,
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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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std::unique_ptr<llvm::Module>
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getModuleFromSource(llvm::opt::ArgStringList CFlags,
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StringRef Name, StringRef Content)
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{
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using namespace vfs;
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llvm::IntrusiveRefCntPtr<OverlayFileSystem> OverlayFS(
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new OverlayFileSystem(getRealFileSystem()));
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llvm::IntrusiveRefCntPtr<InMemoryFileSystem> MemFS(
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new InMemoryFileSystem(true));
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/*
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* pushOverlay helps setting working dir for MemFS. Must call
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* before addFile.
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*/
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OverlayFS->pushOverlay(MemFS);
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MemFS->addFile(Twine(Name), 0, llvm::MemoryBuffer::getMemBuffer(Content));
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return getModuleFromSource(std::move(CFlags), Name, OverlayFS);
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}
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std::unique_ptr<llvm::Module>
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getModuleFromSource(llvm::opt::ArgStringList CFlags, StringRef Path)
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{
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IntrusiveRefCntPtr<vfs::FileSystem> VFS(vfs::getRealFileSystem());
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return getModuleFromSource(std::move(CFlags), Path, VFS);
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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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