1 //===-- llvm-lto2: test harness for the resolution-based LTO interface ----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This program takes in a list of bitcode files, links them and performs
11 // link-time optimization according to the provided symbol resolutions using the
12 // resolution-based LTO interface, and outputs one or more object files.
14 // This program is intended to eventually replace llvm-lto which uses the legacy
17 //===----------------------------------------------------------------------===//
19 #include "llvm/Bitcode/BitcodeReader.h"
20 #include "llvm/CodeGen/CommandFlags.h"
21 #include "llvm/IR/DiagnosticPrinter.h"
22 #include "llvm/LTO/Caching.h"
23 #include "llvm/LTO/LTO.h"
24 #include "llvm/Support/CommandLine.h"
25 #include "llvm/Support/FileSystem.h"
26 #include "llvm/Support/TargetSelect.h"
27 #include "llvm/Support/Threading.h"
33 OptLevel("O", cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
35 cl::Prefix, cl::ZeroOrMore, cl::init('2'));
37 static cl::opt<char> CGOptLevel(
39 cl::desc("Codegen optimization level (0, 1, 2 or 3, default = '2')"),
42 static cl::list<std::string> InputFilenames(cl::Positional, cl::OneOrMore,
43 cl::desc("<input bitcode files>"));
45 static cl::opt<std::string> OutputFilename("o", cl::Required,
46 cl::desc("Output filename"),
47 cl::value_desc("filename"));
49 static cl::opt<std::string> CacheDir("cache-dir", cl::desc("Cache Directory"),
50 cl::value_desc("directory"));
52 static cl::opt<std::string> OptPipeline("opt-pipeline",
53 cl::desc("Optimizer Pipeline"),
54 cl::value_desc("pipeline"));
56 static cl::opt<std::string> AAPipeline("aa-pipeline",
57 cl::desc("Alias Analysis Pipeline"),
58 cl::value_desc("aapipeline"));
60 static cl::opt<bool> SaveTemps("save-temps", cl::desc("Save temporary files"));
63 ThinLTODistributedIndexes("thinlto-distributed-indexes", cl::init(false),
64 cl::desc("Write out individual index and "
65 "import files for the "
66 "distributed backend case"));
68 static cl::opt<int> Threads("thinlto-threads",
69 cl::init(llvm::heavyweight_hardware_concurrency()));
71 static cl::list<std::string> SymbolResolutions(
73 cl::desc("Specify a symbol resolution: filename,symbolname,resolution\n"
74 "where \"resolution\" is a sequence (which may be empty) of the\n"
75 "following characters:\n"
76 " p - prevailing: the linker has chosen this definition of the\n"
78 " l - local: the definition of this symbol is unpreemptable at\n"
79 " runtime and is known to be in this linkage unit\n"
80 " x - externally visible: the definition of this symbol is\n"
81 " visible outside of the LTO unit\n"
82 "A resolution for each symbol must be specified."),
85 static cl::opt<std::string> OverrideTriple(
87 cl::desc("Replace target triples in input files with this triple"));
89 static cl::opt<std::string> DefaultTriple(
92 "Replace unspecified target triples in input files with this triple"));
94 static cl::opt<std::string>
95 OptRemarksOutput("pass-remarks-output",
96 cl::desc("YAML output file for optimization remarks"));
98 static cl::opt<bool> OptRemarksWithHotness(
99 "pass-remarks-with-hotness",
100 cl::desc("Whether to include hotness informations in the remarks.\n"
101 "Has effect only if -pass-remarks-output is specified."));
104 UseNewPM("use-new-pm",
105 cl::desc("Run LTO passes using the new pass manager"),
106 cl::init(false), cl::Hidden);
108 static void check(Error E, std::string Msg) {
111 handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
112 errs() << "llvm-lto2: " << Msg << ": " << EIB.message().c_str() << '\n';
117 template <typename T> static T check(Expected<T> E, std::string Msg) {
119 return std::move(*E);
120 check(E.takeError(), Msg);
124 static void check(std::error_code EC, std::string Msg) {
125 check(errorCodeToError(EC), Msg);
128 template <typename T> static T check(ErrorOr<T> E, std::string Msg) {
130 return std::move(*E);
131 check(E.getError(), Msg);
136 errs() << "Available subcommands: dump-symtab run\n";
140 static int run(int argc, char **argv) {
141 cl::ParseCommandLineOptions(argc, argv, "Resolution-based LTO test harness");
143 // FIXME: Workaround PR30396 which means that a symbol can appear
144 // more than once if it is defined in module-level assembly and
145 // has a GV declaration. We allow (file, symbol) pairs to have multiple
146 // resolutions and apply them in the order observed.
147 std::map<std::pair<std::string, std::string>, std::list<SymbolResolution>>
148 CommandLineResolutions;
149 for (std::string R : SymbolResolutions) {
151 StringRef FileName, SymbolName;
152 std::tie(FileName, Rest) = Rest.split(',');
154 llvm::errs() << "invalid resolution: " << R << '\n';
157 std::tie(SymbolName, Rest) = Rest.split(',');
158 SymbolResolution Res;
159 for (char C : Rest) {
161 Res.Prevailing = true;
163 Res.FinalDefinitionInLinkageUnit = true;
165 Res.VisibleToRegularObj = true;
167 Res.LinkerRedefined = true;
169 llvm::errs() << "invalid character " << C << " in resolution: " << R
174 CommandLineResolutions[{FileName, SymbolName}].push_back(Res);
177 std::vector<std::unique_ptr<MemoryBuffer>> MBs;
180 Conf.DiagHandler = [](const DiagnosticInfo &DI) {
181 DiagnosticPrinterRawOStream DP(errs());
188 Conf.Options = InitTargetOptionsFromCodeGenFlags();
189 Conf.MAttrs = MAttrs;
190 if (auto RM = getRelocModel())
191 Conf.RelocModel = *RM;
192 Conf.CodeModel = CMModel;
195 check(Conf.addSaveTemps(OutputFilename + "."),
196 "Config::addSaveTemps failed");
198 // Optimization remarks.
199 Conf.RemarksFilename = OptRemarksOutput;
200 Conf.RemarksWithHotness = OptRemarksWithHotness;
202 // Run a custom pipeline, if asked for.
203 Conf.OptPipeline = OptPipeline;
204 Conf.AAPipeline = AAPipeline;
206 Conf.OptLevel = OptLevel - '0';
207 Conf.UseNewPM = UseNewPM;
208 switch (CGOptLevel) {
210 Conf.CGOptLevel = CodeGenOpt::None;
213 Conf.CGOptLevel = CodeGenOpt::Less;
216 Conf.CGOptLevel = CodeGenOpt::Default;
219 Conf.CGOptLevel = CodeGenOpt::Aggressive;
222 llvm::errs() << "invalid cg optimization level: " << CGOptLevel << '\n';
226 if (FileType.getNumOccurrences())
227 Conf.CGFileType = FileType;
229 Conf.OverrideTriple = OverrideTriple;
230 Conf.DefaultTriple = DefaultTriple;
233 if (ThinLTODistributedIndexes)
234 Backend = createWriteIndexesThinBackend("", "", true, "");
236 Backend = createInProcessThinBackend(Threads);
237 LTO Lto(std::move(Conf), std::move(Backend));
239 bool HasErrors = false;
240 for (std::string F : InputFilenames) {
241 std::unique_ptr<MemoryBuffer> MB = check(MemoryBuffer::getFile(F), F);
242 std::unique_ptr<InputFile> Input =
243 check(InputFile::create(MB->getMemBufferRef()), F);
245 std::vector<SymbolResolution> Res;
246 for (const InputFile::Symbol &Sym : Input->symbols()) {
247 auto I = CommandLineResolutions.find({F, Sym.getName()});
248 if (I == CommandLineResolutions.end()) {
249 llvm::errs() << argv[0] << ": missing symbol resolution for " << F
250 << ',' << Sym.getName() << '\n';
253 Res.push_back(I->second.front());
254 I->second.pop_front();
255 if (I->second.empty())
256 CommandLineResolutions.erase(I);
263 MBs.push_back(std::move(MB));
264 check(Lto.add(std::move(Input), Res), F);
267 if (!CommandLineResolutions.empty()) {
269 for (auto UnusedRes : CommandLineResolutions)
270 llvm::errs() << argv[0] << ": unused symbol resolution for "
271 << UnusedRes.first.first << ',' << UnusedRes.first.second
278 [&](size_t Task) -> std::unique_ptr<lto::NativeObjectStream> {
279 std::string Path = OutputFilename + "." + utostr(Task);
282 auto S = llvm::make_unique<raw_fd_ostream>(Path, EC, sys::fs::F_None);
284 return llvm::make_unique<lto::NativeObjectStream>(std::move(S));
287 auto AddBuffer = [&](size_t Task, std::unique_ptr<MemoryBuffer> MB) {
288 *AddStream(Task)->OS << MB->getBuffer();
291 NativeObjectCache Cache;
292 if (!CacheDir.empty())
293 Cache = check(localCache(CacheDir, AddBuffer), "failed to create cache");
295 check(Lto.run(AddStream, Cache), "LTO::run failed");
299 static int dumpSymtab(int argc, char **argv) {
300 for (StringRef F : make_range(argv + 1, argv + argc)) {
301 std::unique_ptr<MemoryBuffer> MB = check(MemoryBuffer::getFile(F), F);
302 BitcodeFileContents BFC = check(getBitcodeFileContents(*MB), F);
304 if (BFC.Symtab.size() >= sizeof(irsymtab::storage::Header)) {
305 auto *Hdr = reinterpret_cast<const irsymtab::storage::Header *>(
307 outs() << "version: " << Hdr->Version << '\n';
308 if (Hdr->Version == irsymtab::storage::Header::kCurrentVersion)
309 outs() << "producer: " << Hdr->Producer.get(BFC.StrtabForSymtab)
313 std::unique_ptr<InputFile> Input =
314 check(InputFile::create(MB->getMemBufferRef()), F);
316 outs() << "target triple: " << Input->getTargetTriple() << '\n';
317 Triple TT(Input->getTargetTriple());
319 outs() << "source filename: " << Input->getSourceFileName() << '\n';
321 if (TT.isOSBinFormatCOFF())
322 outs() << "linker opts: " << Input->getCOFFLinkerOpts() << '\n';
324 std::vector<StringRef> ComdatTable = Input->getComdatTable();
325 for (const InputFile::Symbol &Sym : Input->symbols()) {
326 switch (Sym.getVisibility()) {
327 case GlobalValue::HiddenVisibility:
330 case GlobalValue::ProtectedVisibility:
333 case GlobalValue::DefaultVisibility:
338 auto PrintBool = [&](char C, bool B) { outs() << (B ? C : '-'); };
339 PrintBool('U', Sym.isUndefined());
340 PrintBool('C', Sym.isCommon());
341 PrintBool('W', Sym.isWeak());
342 PrintBool('I', Sym.isIndirect());
343 PrintBool('O', Sym.canBeOmittedFromSymbolTable());
344 PrintBool('T', Sym.isTLS());
345 PrintBool('X', Sym.isExecutable());
346 outs() << ' ' << Sym.getName() << '\n';
349 outs() << " size " << Sym.getCommonSize() << " align "
350 << Sym.getCommonAlignment() << '\n';
352 int Comdat = Sym.getComdatIndex();
354 outs() << " comdat " << ComdatTable[Comdat] << '\n';
356 if (TT.isOSBinFormatCOFF() && Sym.isWeak() && Sym.isIndirect())
357 outs() << " fallback " << Sym.getCOFFWeakExternalFallback() << '\n';
366 int main(int argc, char **argv) {
367 InitializeAllTargets();
368 InitializeAllTargetMCs();
369 InitializeAllAsmPrinters();
370 InitializeAllAsmParsers();
372 // FIXME: This should use llvm::cl subcommands, but it isn't currently
373 // possible to pass an argument not associated with a subcommand to a
374 // subcommand (e.g. -use-new-pm).
378 StringRef Subcommand = argv[1];
379 // Ensure that argv[0] is correct after adjusting argv/argc.
381 if (Subcommand == "dump-symtab")
382 return dumpSymtab(argc - 1, argv + 1);
383 if (Subcommand == "run")
384 return run(argc - 1, argv + 1);