forked from OSchip/llvm-project
214 lines
7.0 KiB
C++
214 lines
7.0 KiB
C++
//===-- llvm-lto2: test harness for the resolution-based LTO interface ----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This program takes in a list of bitcode files, links them and performs
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// link-time optimization according to the provided symbol resolutions using the
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// resolution-based LTO interface, and outputs one or more object files.
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//
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// This program is intended to eventually replace llvm-lto which uses the legacy
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// LTO interface.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/LTO/Caching.h"
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#include "llvm/LTO/LTO.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/TargetSelect.h"
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using namespace llvm;
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using namespace lto;
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using namespace object;
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static cl::list<std::string> InputFilenames(cl::Positional, cl::OneOrMore,
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cl::desc("<input bitcode files>"));
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static cl::opt<std::string> OutputFilename("o", cl::Required,
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cl::desc("Output filename"),
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cl::value_desc("filename"));
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static cl::opt<std::string> CacheDir("cache-dir", cl::desc("Cache Directory"),
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cl::value_desc("directory"));
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static cl::opt<bool> SaveTemps("save-temps", cl::desc("Save temporary files"));
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static cl::opt<bool>
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ThinLTODistributedIndexes("thinlto-distributed-indexes", cl::init(false),
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cl::desc("Write out individual index and "
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"import files for the "
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"distributed backend case"));
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static cl::opt<int> Threads("-thinlto-threads",
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cl::init(thread::hardware_concurrency()));
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static cl::list<std::string> SymbolResolutions(
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"r",
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cl::desc("Specify a symbol resolution: filename,symbolname,resolution\n"
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"where \"resolution\" is a sequence (which may be empty) of the\n"
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"following characters:\n"
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" p - prevailing: the linker has chosen this definition of the\n"
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" symbol\n"
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" l - local: the definition of this symbol is unpreemptable at\n"
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" runtime and is known to be in this linkage unit\n"
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" x - externally visible: the definition of this symbol is\n"
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" visible outside of the LTO unit\n"
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"A resolution for each symbol must be specified."),
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cl::ZeroOrMore);
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static void check(Error E, std::string Msg) {
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if (!E)
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return;
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handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
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errs() << "llvm-lto: " << Msg << ": " << EIB.message().c_str() << '\n';
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});
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exit(1);
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}
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template <typename T> static T check(Expected<T> E, std::string Msg) {
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if (E)
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return std::move(*E);
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check(E.takeError(), Msg);
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return T();
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}
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static void check(std::error_code EC, std::string Msg) {
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check(errorCodeToError(EC), Msg);
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}
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template <typename T> static T check(ErrorOr<T> E, std::string Msg) {
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if (E)
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return std::move(*E);
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check(E.getError(), Msg);
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return T();
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}
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namespace {
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// Define the LTOOutput handling
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class LTOOutput : public lto::NativeObjectOutput {
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std::string Path;
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public:
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LTOOutput(std::string Path) : Path(std::move(Path)) {}
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std::unique_ptr<raw_pwrite_stream> getStream() override {
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std::error_code EC;
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auto S = llvm::make_unique<raw_fd_ostream>(Path, EC, sys::fs::F_None);
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check(EC, Path);
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return std::move(S);
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}
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};
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}
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int main(int argc, char **argv) {
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InitializeAllTargets();
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InitializeAllTargetMCs();
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InitializeAllAsmPrinters();
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InitializeAllAsmParsers();
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cl::ParseCommandLineOptions(argc, argv, "Resolution-based LTO test harness");
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std::map<std::pair<std::string, std::string>, SymbolResolution>
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CommandLineResolutions;
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for (std::string R : SymbolResolutions) {
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StringRef Rest = R;
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StringRef FileName, SymbolName;
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std::tie(FileName, Rest) = Rest.split(',');
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if (Rest.empty()) {
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llvm::errs() << "invalid resolution: " << R << '\n';
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return 1;
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}
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std::tie(SymbolName, Rest) = Rest.split(',');
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SymbolResolution Res;
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for (char C : Rest) {
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if (C == 'p')
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Res.Prevailing = true;
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else if (C == 'l')
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Res.FinalDefinitionInLinkageUnit = true;
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else if (C == 'x')
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Res.VisibleToRegularObj = true;
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else
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llvm::errs() << "invalid character " << C << " in resolution: " << R
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<< '\n';
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}
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CommandLineResolutions[{FileName, SymbolName}] = Res;
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}
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std::vector<std::unique_ptr<MemoryBuffer>> MBs;
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Config Conf;
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Conf.DiagHandler = [](const DiagnosticInfo &) {
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exit(1);
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};
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if (SaveTemps)
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check(Conf.addSaveTemps(OutputFilename + "."),
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"Config::addSaveTemps failed");
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ThinBackend Backend;
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if (ThinLTODistributedIndexes)
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Backend = createWriteIndexesThinBackend("", "", true, "");
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else
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Backend = createInProcessThinBackend(Threads);
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LTO Lto(std::move(Conf), std::move(Backend));
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bool HasErrors = false;
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for (std::string F : InputFilenames) {
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std::unique_ptr<MemoryBuffer> MB = check(MemoryBuffer::getFile(F), F);
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std::unique_ptr<InputFile> Input =
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check(InputFile::create(MB->getMemBufferRef()), F);
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std::vector<SymbolResolution> Res;
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for (const InputFile::Symbol &Sym : Input->symbols()) {
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auto I = CommandLineResolutions.find({F, Sym.getName()});
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if (I == CommandLineResolutions.end()) {
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llvm::errs() << argv[0] << ": missing symbol resolution for " << F
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<< ',' << Sym.getName() << '\n';
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HasErrors = true;
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} else {
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Res.push_back(I->second);
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CommandLineResolutions.erase(I);
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}
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}
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if (HasErrors)
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continue;
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MBs.push_back(std::move(MB));
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check(Lto.add(std::move(Input), Res), F);
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}
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if (!CommandLineResolutions.empty()) {
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HasErrors = true;
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for (auto UnusedRes : CommandLineResolutions)
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llvm::errs() << argv[0] << ": unused symbol resolution for "
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<< UnusedRes.first.first << ',' << UnusedRes.first.second
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<< '\n';
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}
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if (HasErrors)
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return 1;
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auto AddOutput =
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[&](size_t Task) -> std::unique_ptr<lto::NativeObjectOutput> {
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std::string Path = OutputFilename + "." + utostr(Task);
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if (CacheDir.empty())
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return llvm::make_unique<LTOOutput>(std::move(Path));
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return llvm::make_unique<CacheObjectOutput>(
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CacheDir, [Path](std::string EntryPath) {
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// Load the entry from the cache now.
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auto ReloadedBufferOrErr = MemoryBuffer::getFile(EntryPath);
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if (auto EC = ReloadedBufferOrErr.getError())
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report_fatal_error(Twine("Can't reload cached file '") + EntryPath +
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"': " + EC.message() + "\n");
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*LTOOutput(Path).getStream() << (*ReloadedBufferOrErr)->getBuffer();
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});
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};
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check(Lto.run(AddOutput), "LTO::run failed");
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}
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