LLVM  7.0.0svn
LTOBackend.cpp
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1 //===-LTOBackend.cpp - LLVM Link Time Optimizer Backend -------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the "backend" phase of LTO, i.e. it performs
11 // optimization and code generation on a loaded module. It is generally used
12 // internally by the LTO class but can also be used independently, for example
13 // to implement a standalone ThinLTO backend.
14 //
15 //===----------------------------------------------------------------------===//
16 
17 #include "llvm/LTO/LTOBackend.h"
25 #include "llvm/IR/PassManager.h"
26 #include "llvm/IR/Verifier.h"
27 #include "llvm/LTO/LTO.h"
31 #include "llvm/Support/Error.h"
34 #include "llvm/Support/Path.h"
35 #include "llvm/Support/Program.h"
40 #include "llvm/Transforms/IPO.h"
45 
46 using namespace llvm;
47 using namespace lto;
48 
50  errs() << "failed to open " << Path << ": " << Msg << '\n';
51  errs().flush();
52  exit(1);
53 }
54 
55 Error Config::addSaveTemps(std::string OutputFileName,
56  bool UseInputModulePath) {
58 
59  std::error_code EC;
60  ResolutionFile = llvm::make_unique<raw_fd_ostream>(
61  OutputFileName + "resolution.txt", EC, sys::fs::OpenFlags::F_Text);
62  if (EC)
63  return errorCodeToError(EC);
64 
65  auto setHook = [&](std::string PathSuffix, ModuleHookFn &Hook) {
66  // Keep track of the hook provided by the linker, which also needs to run.
67  ModuleHookFn LinkerHook = Hook;
68  Hook = [=](unsigned Task, const Module &M) {
69  // If the linker's hook returned false, we need to pass that result
70  // through.
71  if (LinkerHook && !LinkerHook(Task, M))
72  return false;
73 
74  std::string PathPrefix;
75  // If this is the combined module (not a ThinLTO backend compile) or the
76  // user hasn't requested using the input module's path, emit to a file
77  // named from the provided OutputFileName with the Task ID appended.
78  if (M.getModuleIdentifier() == "ld-temp.o" || !UseInputModulePath) {
79  PathPrefix = OutputFileName;
80  if (Task != (unsigned)-1)
81  PathPrefix += utostr(Task) + ".";
82  } else
83  PathPrefix = M.getModuleIdentifier() + ".";
84  std::string Path = PathPrefix + PathSuffix + ".bc";
85  std::error_code EC;
87  // Because -save-temps is a debugging feature, we report the error
88  // directly and exit.
89  if (EC)
90  reportOpenError(Path, EC.message());
91  WriteBitcodeToFile(M, OS, /*ShouldPreserveUseListOrder=*/false);
92  return true;
93  };
94  };
95 
96  setHook("0.preopt", PreOptModuleHook);
97  setHook("1.promote", PostPromoteModuleHook);
98  setHook("2.internalize", PostInternalizeModuleHook);
99  setHook("3.import", PostImportModuleHook);
100  setHook("4.opt", PostOptModuleHook);
101  setHook("5.precodegen", PreCodeGenModuleHook);
102 
104  std::string Path = OutputFileName + "index.bc";
105  std::error_code EC;
107  // Because -save-temps is a debugging feature, we report the error
108  // directly and exit.
109  if (EC)
110  reportOpenError(Path, EC.message());
111  WriteIndexToFile(Index, OS);
112 
113  Path = OutputFileName + "index.dot";
115  if (EC)
116  reportOpenError(Path, EC.message());
117  Index.exportToDot(OSDot);
118  return true;
119  };
120 
121  return Error::success();
122 }
123 
124 namespace {
125 
126 std::unique_ptr<TargetMachine>
127 createTargetMachine(Config &Conf, const Target *TheTarget, Module &M) {
128  StringRef TheTriple = M.getTargetTriple();
130  Features.getDefaultSubtargetFeatures(Triple(TheTriple));
131  for (const std::string &A : Conf.MAttrs)
132  Features.AddFeature(A);
133 
135  if (Conf.RelocModel)
136  RelocModel = *Conf.RelocModel;
137  else
138  RelocModel =
140 
141  return std::unique_ptr<TargetMachine>(TheTarget->createTargetMachine(
142  TheTriple, Conf.CPU, Features.getString(), Conf.Options, RelocModel,
143  Conf.CodeModel, Conf.CGOptLevel));
144 }
145 
146 static void runNewPMPasses(Config &Conf, Module &Mod, TargetMachine *TM,
147  unsigned OptLevel, bool IsThinLTO,
148  ModuleSummaryIndex *ExportSummary,
149  const ModuleSummaryIndex *ImportSummary) {
150  Optional<PGOOptions> PGOOpt;
151  if (!Conf.SampleProfile.empty())
152  PGOOpt = PGOOptions("", "", Conf.SampleProfile, false, true);
153 
154  PassBuilder PB(TM, PGOOpt);
155  AAManager AA;
156 
157  // Parse a custom AA pipeline if asked to.
158  if (!PB.parseAAPipeline(AA, "default"))
159  report_fatal_error("Error parsing default AA pipeline");
160 
165 
166  // Register the AA manager first so that our version is the one used.
167  FAM.registerPass([&] { return std::move(AA); });
168 
169  // Register all the basic analyses with the managers.
170  PB.registerModuleAnalyses(MAM);
171  PB.registerCGSCCAnalyses(CGAM);
172  PB.registerFunctionAnalyses(FAM);
173  PB.registerLoopAnalyses(LAM);
174  PB.crossRegisterProxies(LAM, FAM, CGAM, MAM);
175 
177  // FIXME (davide): verify the input.
178 
180 
181  switch (OptLevel) {
182  default:
183  llvm_unreachable("Invalid optimization level");
184  case 0:
185  OL = PassBuilder::O0;
186  break;
187  case 1:
188  OL = PassBuilder::O1;
189  break;
190  case 2:
191  OL = PassBuilder::O2;
192  break;
193  case 3:
194  OL = PassBuilder::O3;
195  break;
196  }
197 
198  if (IsThinLTO)
200  ImportSummary);
201  else
202  MPM = PB.buildLTODefaultPipeline(OL, Conf.DebugPassManager, ExportSummary);
203  MPM.run(Mod, MAM);
204 
205  // FIXME (davide): verify the output.
206 }
207 
208 static void runNewPMCustomPasses(Module &Mod, TargetMachine *TM,
209  std::string PipelineDesc,
210  std::string AAPipelineDesc,
211  bool DisableVerify) {
212  PassBuilder PB(TM);
213  AAManager AA;
214 
215  // Parse a custom AA pipeline if asked to.
216  if (!AAPipelineDesc.empty())
217  if (!PB.parseAAPipeline(AA, AAPipelineDesc))
218  report_fatal_error("unable to parse AA pipeline description: " +
219  AAPipelineDesc);
220 
225 
226  // Register the AA manager first so that our version is the one used.
227  FAM.registerPass([&] { return std::move(AA); });
228 
229  // Register all the basic analyses with the managers.
230  PB.registerModuleAnalyses(MAM);
231  PB.registerCGSCCAnalyses(CGAM);
232  PB.registerFunctionAnalyses(FAM);
233  PB.registerLoopAnalyses(LAM);
234  PB.crossRegisterProxies(LAM, FAM, CGAM, MAM);
235 
236  ModulePassManager MPM;
237 
238  // Always verify the input.
239  MPM.addPass(VerifierPass());
240 
241  // Now, add all the passes we've been requested to.
242  if (!PB.parsePassPipeline(MPM, PipelineDesc))
243  report_fatal_error("unable to parse pass pipeline description: " +
244  PipelineDesc);
245 
246  if (!DisableVerify)
247  MPM.addPass(VerifierPass());
248  MPM.run(Mod, MAM);
249 }
250 
251 static void runOldPMPasses(Config &Conf, Module &Mod, TargetMachine *TM,
252  bool IsThinLTO, ModuleSummaryIndex *ExportSummary,
253  const ModuleSummaryIndex *ImportSummary) {
254  legacy::PassManager passes;
256 
257  PassManagerBuilder PMB;
260  PMB.ExportSummary = ExportSummary;
261  PMB.ImportSummary = ImportSummary;
262  // Unconditionally verify input since it is not verified before this
263  // point and has unknown origin.
264  PMB.VerifyInput = true;
265  PMB.VerifyOutput = !Conf.DisableVerify;
266  PMB.LoopVectorize = true;
267  PMB.SLPVectorize = true;
268  PMB.OptLevel = Conf.OptLevel;
269  PMB.PGOSampleUse = Conf.SampleProfile;
270  if (IsThinLTO)
271  PMB.populateThinLTOPassManager(passes);
272  else
273  PMB.populateLTOPassManager(passes);
274  passes.run(Mod);
275 }
276 
277 bool opt(Config &Conf, TargetMachine *TM, unsigned Task, Module &Mod,
278  bool IsThinLTO, ModuleSummaryIndex *ExportSummary,
279  const ModuleSummaryIndex *ImportSummary) {
280  // FIXME: Plumb the combined index into the new pass manager.
281  if (!Conf.OptPipeline.empty())
282  runNewPMCustomPasses(Mod, TM, Conf.OptPipeline, Conf.AAPipeline,
283  Conf.DisableVerify);
284  else if (Conf.UseNewPM)
285  runNewPMPasses(Conf, Mod, TM, Conf.OptLevel, IsThinLTO, ExportSummary,
286  ImportSummary);
287  else
288  runOldPMPasses(Conf, Mod, TM, IsThinLTO, ExportSummary, ImportSummary);
289  return !Conf.PostOptModuleHook || Conf.PostOptModuleHook(Task, Mod);
290 }
291 
292 void codegen(Config &Conf, TargetMachine *TM, AddStreamFn AddStream,
293  unsigned Task, Module &Mod) {
294  if (Conf.PreCodeGenModuleHook && !Conf.PreCodeGenModuleHook(Task, Mod))
295  return;
296 
297  std::unique_ptr<ToolOutputFile> DwoOut;
298  SmallString<1024> DwoFile(Conf.DwoPath);
299  if (!Conf.DwoDir.empty()) {
300  std::error_code EC;
301  if (auto EC = llvm::sys::fs::create_directories(Conf.DwoDir))
302  report_fatal_error("Failed to create directory " + Conf.DwoDir + ": " +
303  EC.message());
304 
305  DwoFile = Conf.DwoDir;
306  sys::path::append(DwoFile, std::to_string(Task) + ".dwo");
307  }
308 
309  if (!DwoFile.empty()) {
310  std::error_code EC;
311  TM->Options.MCOptions.SplitDwarfFile = DwoFile.str().str();
312  DwoOut = llvm::make_unique<ToolOutputFile>(DwoFile, EC, sys::fs::F_None);
313  if (EC)
314  report_fatal_error("Failed to open " + DwoFile + ": " + EC.message());
315  }
316 
317  auto Stream = AddStream(Task);
318  legacy::PassManager CodeGenPasses;
319  if (TM->addPassesToEmitFile(CodeGenPasses, *Stream->OS,
320  DwoOut ? &DwoOut->os() : nullptr,
321  Conf.CGFileType))
322  report_fatal_error("Failed to setup codegen");
323  CodeGenPasses.run(Mod);
324 
325  if (DwoOut)
326  DwoOut->keep();
327 }
328 
329 void splitCodeGen(Config &C, TargetMachine *TM, AddStreamFn AddStream,
330  unsigned ParallelCodeGenParallelismLevel,
331  std::unique_ptr<Module> Mod) {
332  ThreadPool CodegenThreadPool(ParallelCodeGenParallelismLevel);
333  unsigned ThreadCount = 0;
334  const Target *T = &TM->getTarget();
335 
336  SplitModule(
337  std::move(Mod), ParallelCodeGenParallelismLevel,
338  [&](std::unique_ptr<Module> MPart) {
339  // We want to clone the module in a new context to multi-thread the
340  // codegen. We do it by serializing partition modules to bitcode
341  // (while still on the main thread, in order to avoid data races) and
342  // spinning up new threads which deserialize the partitions into
343  // separate contexts.
344  // FIXME: Provide a more direct way to do this in LLVM.
345  SmallString<0> BC;
346  raw_svector_ostream BCOS(BC);
347  WriteBitcodeToFile(*MPart, BCOS);
348 
349  // Enqueue the task
350  CodegenThreadPool.async(
351  [&](const SmallString<0> &BC, unsigned ThreadId) {
352  LTOLLVMContext Ctx(C);
354  MemoryBufferRef(StringRef(BC.data(), BC.size()), "ld-temp.o"),
355  Ctx);
356  if (!MOrErr)
357  report_fatal_error("Failed to read bitcode");
358  std::unique_ptr<Module> MPartInCtx = std::move(MOrErr.get());
359 
360  std::unique_ptr<TargetMachine> TM =
361  createTargetMachine(C, T, *MPartInCtx);
362 
363  codegen(C, TM.get(), AddStream, ThreadId, *MPartInCtx);
364  },
365  // Pass BC using std::move to ensure that it get moved rather than
366  // copied into the thread's context.
367  std::move(BC), ThreadCount++);
368  },
369  false);
370 
371  // Because the inner lambda (which runs in a worker thread) captures our local
372  // variables, we need to wait for the worker threads to terminate before we
373  // can leave the function scope.
374  CodegenThreadPool.wait();
375 }
376 
377 Expected<const Target *> initAndLookupTarget(Config &C, Module &Mod) {
378  if (!C.OverrideTriple.empty())
380  else if (Mod.getTargetTriple().empty())
382 
383  std::string Msg;
385  if (!T)
386  return make_error<StringError>(Msg, inconvertibleErrorCode());
387  return T;
388 }
389 
390 }
391 
392 static Error
393 finalizeOptimizationRemarks(std::unique_ptr<ToolOutputFile> DiagOutputFile) {
394  // Make sure we flush the diagnostic remarks file in case the linker doesn't
395  // call the global destructors before exiting.
396  if (!DiagOutputFile)
397  return Error::success();
398  DiagOutputFile->keep();
399  DiagOutputFile->os().flush();
400  return Error::success();
401 }
402 
404  unsigned ParallelCodeGenParallelismLevel,
405  std::unique_ptr<Module> Mod,
406  ModuleSummaryIndex &CombinedIndex) {
407  Expected<const Target *> TOrErr = initAndLookupTarget(C, *Mod);
408  if (!TOrErr)
409  return TOrErr.takeError();
410 
411  std::unique_ptr<TargetMachine> TM = createTargetMachine(C, *TOrErr, *Mod);
412 
413  // Setup optimization remarks.
414  auto DiagFileOrErr = lto::setupOptimizationRemarks(
415  Mod->getContext(), C.RemarksFilename, C.RemarksWithHotness);
416  if (!DiagFileOrErr)
417  return DiagFileOrErr.takeError();
418  auto DiagnosticOutputFile = std::move(*DiagFileOrErr);
419 
420  if (!C.CodeGenOnly) {
421  if (!opt(C, TM.get(), 0, *Mod, /*IsThinLTO=*/false,
422  /*ExportSummary=*/&CombinedIndex, /*ImportSummary=*/nullptr))
423  return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
424  }
425 
426  if (ParallelCodeGenParallelismLevel == 1) {
427  codegen(C, TM.get(), AddStream, 0, *Mod);
428  } else {
429  splitCodeGen(C, TM.get(), AddStream, ParallelCodeGenParallelismLevel,
430  std::move(Mod));
431  }
432  return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
433 }
434 
435 static void dropDeadSymbols(Module &Mod, const GVSummaryMapTy &DefinedGlobals,
436  const ModuleSummaryIndex &Index) {
437  std::vector<GlobalValue*> DeadGVs;
438  for (auto &GV : Mod.global_values())
439  if (GlobalValueSummary *GVS = DefinedGlobals.lookup(GV.getGUID()))
440  if (!Index.isGlobalValueLive(GVS)) {
441  DeadGVs.push_back(&GV);
443  }
444 
445  // Now that all dead bodies have been dropped, delete the actual objects
446  // themselves when possible.
447  for (GlobalValue *GV : DeadGVs) {
448  GV->removeDeadConstantUsers();
449  // Might reference something defined in native object (i.e. dropped a
450  // non-prevailing IR def, but we need to keep the declaration).
451  if (GV->use_empty())
452  GV->eraseFromParent();
453  }
454 }
455 
456 Error lto::thinBackend(Config &Conf, unsigned Task, AddStreamFn AddStream,
457  Module &Mod, const ModuleSummaryIndex &CombinedIndex,
458  const FunctionImporter::ImportMapTy &ImportList,
459  const GVSummaryMapTy &DefinedGlobals,
461  Expected<const Target *> TOrErr = initAndLookupTarget(Conf, Mod);
462  if (!TOrErr)
463  return TOrErr.takeError();
464 
465  std::unique_ptr<TargetMachine> TM = createTargetMachine(Conf, *TOrErr, Mod);
466 
467  // Setup optimization remarks.
468  auto DiagFileOrErr = lto::setupOptimizationRemarks(
469  Mod.getContext(), Conf.RemarksFilename, Conf.RemarksWithHotness, Task);
470  if (!DiagFileOrErr)
471  return DiagFileOrErr.takeError();
472  auto DiagnosticOutputFile = std::move(*DiagFileOrErr);
473 
474  if (Conf.CodeGenOnly) {
475  codegen(Conf, TM.get(), AddStream, Task, Mod);
476  return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
477  }
478 
479  if (Conf.PreOptModuleHook && !Conf.PreOptModuleHook(Task, Mod))
480  return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
481 
482  renameModuleForThinLTO(Mod, CombinedIndex);
483 
484  dropDeadSymbols(Mod, DefinedGlobals, CombinedIndex);
485 
486  thinLTOResolveWeakForLinkerModule(Mod, DefinedGlobals);
487 
488  if (Conf.PostPromoteModuleHook && !Conf.PostPromoteModuleHook(Task, Mod))
489  return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
490 
491  if (!DefinedGlobals.empty())
492  thinLTOInternalizeModule(Mod, DefinedGlobals);
493 
494  if (Conf.PostInternalizeModuleHook &&
495  !Conf.PostInternalizeModuleHook(Task, Mod))
496  return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
497 
498  auto ModuleLoader = [&](StringRef Identifier) {
500  "ODR Type uniquing should be enabled on the context");
501  auto I = ModuleMap.find(Identifier);
502  assert(I != ModuleMap.end());
503  return I->second.getLazyModule(Mod.getContext(),
504  /*ShouldLazyLoadMetadata=*/true,
505  /*IsImporting*/ true);
506  };
507 
508  FunctionImporter Importer(CombinedIndex, ModuleLoader);
509  if (Error Err = Importer.importFunctions(Mod, ImportList).takeError())
510  return Err;
511 
512  if (Conf.PostImportModuleHook && !Conf.PostImportModuleHook(Task, Mod))
513  return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
514 
515  if (!opt(Conf, TM.get(), Task, Mod, /*IsThinLTO=*/true,
516  /*ExportSummary=*/nullptr, /*ImportSummary=*/&CombinedIndex))
517  return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
518 
519  codegen(Conf, TM.get(), AddStream, Task, Mod);
520  return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
521 }
static void codegen(Module *M, llvm::raw_pwrite_stream &OS, function_ref< std::unique_ptr< TargetMachine >()> TMFactory, TargetMachine::CodeGenFileType FileType)
Definition: ParallelCG.cpp:28
uint64_t CallInst * C
std::error_code create_directories(const Twine &path, bool IgnoreExisting=true, perms Perms=owner_all|group_all)
Create all the non-existent directories in path.
Definition: Path.cpp:906
const std::string & getTargetTriple() const
Get the target triple which is a string describing the target host.
Definition: Module.h:238
Interfaces for registering analysis passes, producing common pass manager configurations, and parsing of pass pipelines.
raw_ostream & errs()
This returns a reference to a raw_ostream for standard error.
Expected< std::unique_ptr< ToolOutputFile > > setupOptimizationRemarks(LLVMContext &Context, StringRef LTORemarksFilename, bool LTOPassRemarksWithHotness, int Count=-1)
Setup optimization remarks.
Definition: LTO.cpp:1227
std::string CPU
Definition: Config.h:39
std::string AAPipeline
Definition: Config.h:63
LLVM_NODISCARD std::string str() const
str - Get the contents as an std::string.
Definition: StringRef.h:228
CodeGenOpt::Level CGOptLevel
Definition: Config.h:44
PassManagerBuilder - This class is used to set up a standard optimization sequence for languages like...
MCTargetOptions MCOptions
Machine level options.
LLVM_ATTRIBUTE_NORETURN void report_fatal_error(Error Err, bool gen_crash_diag=true)
Report a serious error, calling any installed error handler.
Definition: Error.cpp:115
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
void getDefaultSubtargetFeatures(const Triple &Triple)
Adds the default features for the specified target triple.
This header provides classes for managing a pipeline of passes over loops in LLVM IR...
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:63
TargetMachine * createTargetMachine(StringRef TT, StringRef CPU, StringRef Features, const TargetOptions &Options, Optional< Reloc::Model > RM, Optional< CodeModel::Model > CM=None, CodeGenOpt::Level OL=CodeGenOpt::Default, bool JIT=false) const
createTargetMachine - Create a target specific machine implementation for the specified Triple...
bool ShouldDiscardValueNames
Definition: Config.h:96
std::string OverrideTriple
Setting this field will replace target triples in input files with this triple.
Definition: Config.h:67
void populateThinLTOPassManager(legacy::PassManagerBase &PM)
std::string SplitDwarfFile
bool CodeGenOnly
Disable entirely the optimizer, including importing for ThinLTO.
Definition: Config.h:53
void registerModuleAnalyses(ModuleAnalysisManager &MAM)
Registers all available module analysis passes.
void SplitModule(std::unique_ptr< Module > M, unsigned N, function_ref< void(std::unique_ptr< Module > MPart)> ModuleCallback, bool PreserveLocals=false)
Splits the module M into N linkable partitions.
std::unique_ptr< raw_ostream > ResolutionFile
If this field is set, LTO will write input file paths and symbol resolutions here in llvm-lto2 comman...
Definition: Config.h:103
bool convertToDeclaration(GlobalValue &GV)
Converts value GV to declaration, or replaces with a declaration if it is an alias.
ImmutablePass * createTargetTransformInfoWrapperPass(TargetIRAnalysis TIRA)
Create an analysis pass wrapper around a TTI object.
ModuleSummaryIndex * ExportSummary
The module summary index to use for exporting information from the regular LTO phase, for example for the CFI and devirtualization type tests.
std::string getString() const
Returns features as a string.
const ModuleSummaryIndex * ImportSummary
The module summary index to use for importing information to the thin LTO backends, for example for the CFI and devirtualization type tests.
A raw_ostream that writes to an SmallVector or SmallString.
Definition: raw_ostream.h:504
OptimizationLevel
LLVM-provided high-level optimization levels.
Definition: PassBuilder.h:92
Implementation of the target library information.
This class implements a map that also provides access to all stored values in a deterministic order...
Definition: MapVector.h:38
bool isGlobalValueLive(const GlobalValueSummary *GVS) const
bool DebugPassManager
Whether to emit the pass manager debuggging informations.
Definition: Config.h:91
std::unique_ptr< Module > splitCodeGen(std::unique_ptr< Module > M, ArrayRef< raw_pwrite_stream *> OSs, ArrayRef< llvm::raw_pwrite_stream *> BCOSs, const std::function< std::unique_ptr< TargetMachine >()> &TMFactory, TargetMachine::CodeGenFileType FileType=TargetMachine::CGFT_ObjectFile, bool PreserveLocals=false)
Split M into OSs.size() partitions, and generate code for each.
Definition: ParallelCG.cpp:38
std::string PGOSampleUse
Path of the sample Profile data file.
Error takeError()
Take ownership of the stored error.
Definition: Error.h:545
static const Target * lookupTarget(const std::string &Triple, std::string &Error)
lookupTarget - Lookup a target based on a target triple.
PreservedAnalyses run(IRUnitT &IR, AnalysisManagerT &AM, ExtraArgTs... ExtraArgs)
Run all of the passes in this manager over the given unit of IR.
Definition: PassManager.h:444
std::shared_future< void > async(Function &&F, Args &&... ArgList)
Asynchronous submission of a task to the pool.
Definition: ThreadPool.h:55
ModuleHookFn PreCodeGenModuleHook
This module hook is called before code generation.
Definition: Config.h:151
Pass * Inliner
Inliner - Specifies the inliner to use.
CombinedIndexHookFn CombinedIndexHook
Definition: Config.h:164
virtual bool addPassesToEmitFile(PassManagerBase &, raw_pwrite_stream &, raw_pwrite_stream *, CodeGenFileType, bool=true, MachineModuleInfo *MMI=nullptr)
Add passes to the specified pass manager to get the specified file emitted.
std::function< std::unique_ptr< NativeObjectStream >unsigned Task)> AddStreamFn
This type defines the callback to add a native object that is generated on the fly.
Definition: LTO.h:174
void append(SmallVectorImpl< char > &path, const Twine &a, const Twine &b="", const Twine &c="", const Twine &d="")
Append to path.
Definition: Path.cpp:471
void add(Pass *P) override
Add a pass to the queue of passes to run.
bool RemarksWithHotness
Whether to emit optimization remarks with hotness informations.
Definition: Config.h:88
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:81
std::string DwoDir
The directory to store .dwo files.
Definition: Config.h:77
std::vector< std::string > MAttrs
Definition: Config.h:41
LLVMContext & getContext() const
Get the global data context.
Definition: Module.h:242
bool parseAAPipeline(AAManager &AA, StringRef PipelineText)
Parse a textual alias analysis pipeline into the provided AA manager.
void populateLTOPassManager(legacy::PassManagerBase &PM)
bool registerPass(PassBuilderT &&PassBuilder)
Register an analysis pass with the manager.
Definition: PassManager.h:739
This class provides access to building LLVM&#39;s passes.
Definition: PassBuilder.h:58
std::function< bool(unsigned Task, const Module &)> ModuleHookFn
The following callbacks deal with tasks, which normally represent the entire optimization and code ge...
Definition: Config.h:129
Tagged union holding either a T or a Error.
Definition: CachePruning.h:23
void AddFeature(StringRef String, bool Enable=true)
Adds Features.
void registerLoopAnalyses(LoopAnalysisManager &LAM)
Registers all available loop analysis passes.
StringRef str() const
Explicit conversion to StringRef.
Definition: SmallString.h:267
bool DisableVerify
Definition: Config.h:47
#define T
unsigned OptLevel
The Optimization Level - Specify the basic optimization level.
void crossRegisterProxies(LoopAnalysisManager &LAM, FunctionAnalysisManager &FAM, CGSCCAnalysisManager &CGAM, ModuleAnalysisManager &MAM)
Cross register the analysis managers through their proxies.
std::string SampleProfile
Sample PGO profile path.
Definition: Config.h:74
TargetOptions Options
Definition: Config.h:40
Optional< CodeModel::Model > CodeModel
Definition: Config.h:43
SmallString - A SmallString is just a SmallVector with methods and accessors that make it work better...
Definition: SmallString.h:26
A ThreadPool for asynchronous parallel execution on a defined number of threads.
Definition: ThreadPool.h:37
Class to hold module path string table and global value map, and encapsulate methods for operating on...
iterator find(const KeyT &Key)
Definition: MapVector.h:148
PassManager manages ModulePassManagers.
static void dropDeadSymbols(Module &Mod, const GVSummaryMapTy &DefinedGlobals, const ModuleSummaryIndex &Index)
Definition: LTOBackend.cpp:435
ModuleHookFn PreOptModuleHook
This module hook is called after linking (regular LTO) or loading (ThinLTO) the module, before modifying it.
Definition: Config.h:133
bool renameModuleForThinLTO(Module &M, const ModuleSummaryIndex &Index, SetVector< GlobalValue *> *GlobalsToImport=nullptr)
Perform in-place global value handling on the given Module for exported local functions renamed and p...
Error errorCodeToError(std::error_code EC)
Helper for converting an std::error_code to a Error.
Definition: Error.cpp:78
TargetLibraryInfoImpl * LibraryInfo
LibraryInfo - Specifies information about the runtime library for the optimizer.
Disable as many optimizations as possible.
Definition: PassBuilder.h:96
A manager for alias analyses.
TargetIRAnalysis getTargetIRAnalysis()
Get a TargetIRAnalysis appropriate for the target.
bool UseNewPM
Use the new pass manager.
Definition: Config.h:50
unsigned OptLevel
Definition: Config.h:46
void WriteBitcodeToFile(const Module &M, raw_ostream &Out, bool ShouldPreserveUseListOrder=false, const ModuleSummaryIndex *Index=nullptr, bool GenerateHash=false, ModuleHash *ModHash=nullptr)
Write the specified module to the specified raw output stream.
bool isODRUniquingDebugTypes() const
Whether there is a string map for uniquing debug info identifiers across the context.
void registerFunctionAnalyses(FunctionAnalysisManager &FAM)
Registers all available function analysis passes.
LTO configuration.
Definition: Config.h:36
std::string DefaultTriple
Setting this field will replace unspecified target triples in input files with this triple...
Definition: Config.h:71
Optimize for fast execution as much as possible.
Definition: PassBuilder.h:150
const Triple & getTargetTriple() const
#define LLVM_ATTRIBUTE_NORETURN
Definition: Compiler.h:209
Function and variable summary information to aid decisions and implementation of importing.
const Target & getTarget() const
ModuleHookFn PostInternalizeModuleHook
This hook is called after internalizing the module.
Definition: Config.h:140
size_t size() const
Definition: SmallVector.h:53
bool run(Module &M)
run - Execute all of the passes scheduled for execution.
Create a verifier pass.
Definition: Verifier.h:137
ModulePassManager buildThinLTODefaultPipeline(OptimizationLevel Level, bool DebugLogging, const ModuleSummaryIndex *ImportSummary)
Build an ThinLTO default optimization pipeline to a pass manager.
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
TargetMachine::CodeGenFileType CGFileType
Definition: Config.h:45
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
std::string RemarksFilename
Optimization remarks file path.
Definition: Config.h:85
static ErrorSuccess success()
Create a success value.
Definition: Error.h:321
Optimize for fast execution as much as possible without triggering significant incremental compile ti...
Definition: PassBuilder.h:134
bool parsePassPipeline(ModulePassManager &MPM, StringRef PipelineText, bool VerifyEachPass=true, bool DebugLogging=false)
Parse a textual pass pipeline description into a ModulePassManager.
Optional< Reloc::Model > RelocModel
Definition: Config.h:42
reference get()
Returns a reference to the stored T value.
Definition: Error.h:525
std::string utostr(uint64_t X, bool isNeg=false)
Definition: StringExtras.h:214
The access may modify the value stored in memory.
StringMap - This is an unconventional map that is specialized for handling keys that are "strings"...
Definition: StringMap.h:220
Target - Wrapper for Target specific information.
Manages the enabling and disabling of subtarget specific features.
std::string OptPipeline
If this field is set, the set of passes run in the middle-end optimizer will be the one specified by ...
Definition: Config.h:58
void WriteIndexToFile(const ModuleSummaryIndex &Index, raw_ostream &Out, const std::map< std::string, GVSummaryMapTy > *ModuleToSummariesForIndex=nullptr)
Write the specified module summary index to the given raw output stream, where it will be written in ...
static Error finalizeOptimizationRemarks(std::unique_ptr< ToolOutputFile > DiagOutputFile)
Definition: LTOBackend.cpp:393
Expected< std::unique_ptr< Module > > parseBitcodeFile(MemoryBufferRef Buffer, LLVMContext &Context)
Read the specified bitcode file, returning the module.
Expected< bool > importFunctions(Module &M, const ImportMapTy &ImportList)
Import functions in Module M based on the supplied import list.
Error thinBackend(Config &C, unsigned Task, AddStreamFn AddStream, Module &M, const ModuleSummaryIndex &CombinedIndex, const FunctionImporter::ImportMapTy &ImportList, const GVSummaryMapTy &DefinedGlobals, MapVector< StringRef, BitcodeModule > &ModuleMap)
Runs a ThinLTO backend.
Definition: LTOBackend.cpp:456
A raw_ostream that writes to a file descriptor.
Definition: raw_ostream.h:366
pointer data()
Return a pointer to the vector&#39;s buffer, even if empty().
Definition: SmallVector.h:144
Manages a sequence of passes over a particular unit of IR.
Definition: PassManager.h:420
LLVM_NODISCARD bool empty() const
Definition: SmallVector.h:56
A struct capturing PGO tunables.
Definition: PassBuilder.h:33
TargetOptions Options
Definition: TargetMachine.h:98
#define I(x, y, z)
Definition: MD5.cpp:58
void thinLTOInternalizeModule(Module &TheModule, const GVSummaryMapTy &DefinedGlobals)
Internalize TheModule based on the information recorded in the summaries during global summary-based ...
void setTargetTriple(StringRef T)
Set the target triple.
Definition: Module.h:274
std::string DwoPath
The path to write a .dwo file to.
Definition: Config.h:82
void thinLTOResolveWeakForLinkerModule(Module &TheModule, const GVSummaryMapTy &DefinedGlobals)
Resolve WeakForLinker values in TheModule based on the information recorded in the summaries during g...
LLVM_NODISCARD bool empty() const
Definition: DenseMap.h:93
ValueT lookup(const_arg_type_t< KeyT > Val) const
lookup - Return the entry for the specified key, or a default constructed value if no such entry exis...
Definition: DenseMap.h:181
This header provides classes for managing passes over SCCs of the call graph.
const std::string to_string(const T &Value)
Definition: ScopedPrinter.h:62
void registerCGSCCAnalyses(CGSCCAnalysisManager &CGAM)
Registers all available CGSCC analysis passes.
ModulePassManager buildLTODefaultPipeline(OptimizationLevel Level, bool DebugLogging, ModuleSummaryIndex *ExportSummary)
Build an LTO default optimization pipeline to a pass manager.
ModuleHookFn PostImportModuleHook
This hook is called after importing from other modules (ThinLTO-specific).
Definition: Config.h:143
Error backend(Config &C, AddStreamFn AddStream, unsigned ParallelCodeGenParallelismLevel, std::unique_ptr< Module > M, ModuleSummaryIndex &CombinedIndex)
Runs a regular LTO backend.
Definition: LTOBackend.cpp:403
iterator end()
Definition: MapVector.h:72
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
Optimize quickly without destroying debuggability.
Definition: PassBuilder.h:116
Pass * createFunctionInliningPass()
createFunctionInliningPass - Return a new pass object that uses a heuristic to inline direct function...
The function importer is automatically importing function from other modules based on the provided su...
Lightweight error class with error context and mandatory checking.
Definition: Error.h:156
const FeatureBitset Features
ModuleHookFn PostOptModuleHook
This module hook is called after optimization is complete.
Definition: Config.h:146
Primary interface to the complete machine description for the target machine.
Definition: TargetMachine.h:59
PICLevel::Level getPICLevel() const
Returns the PIC level (small or large model)
Definition: Module.cpp:480
Error addSaveTemps(std::string OutputFileName, bool UseInputModulePath=false)
This is a convenience function that configures this Config object to write temporary files named afte...
Definition: LTOBackend.cpp:55
A derived class of LLVMContext that initializes itself according to a given Config object...
Definition: Config.h:199
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
hexagon cext opt
A container for analyses that lazily runs them and caches their results.
void addPass(PassT Pass)
Definition: PassManager.h:485
static LLVM_ATTRIBUTE_NORETURN void reportOpenError(StringRef Path, Twine Msg)
Definition: LTOBackend.cpp:49
This pass exposes codegen information to IR-level passes.
This header defines various interfaces for pass management in LLVM.
ModuleHookFn PostPromoteModuleHook
This hook is called after promoting any internal functions (ThinLTO-specific).
Definition: Config.h:137
iterator_range< global_value_iterator > global_values()
Definition: Module.h:667
void wait()
Blocking wait for all the threads to complete and the queue to be empty.
Definition: ThreadPool.cpp:72
std::error_code inconvertibleErrorCode()
The value returned by this function can be returned from convertToErrorCode for Error values where no...
Definition: Error.cpp:73