LLVM  9.0.0svn
LTOCodeGenerator.cpp
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1 //===-LTOCodeGenerator.cpp - LLVM Link Time Optimizer ---------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the Link Time Optimization library. This library is
10 // intended to be used by linker to optimize code at link time.
11 //
12 //===----------------------------------------------------------------------===//
13 
15 
16 #include "llvm/ADT/Statistic.h"
17 #include "llvm/ADT/StringExtras.h"
18 #include "llvm/Analysis/Passes.h"
24 #include "llvm/Config/config.h"
25 #include "llvm/IR/Constants.h"
26 #include "llvm/IR/DataLayout.h"
27 #include "llvm/IR/DebugInfo.h"
28 #include "llvm/IR/DerivedTypes.h"
29 #include "llvm/IR/DiagnosticInfo.h"
31 #include "llvm/IR/LLVMContext.h"
33 #include "llvm/IR/Mangler.h"
34 #include "llvm/IR/Module.h"
35 #include "llvm/IR/PassTimingInfo.h"
36 #include "llvm/IR/Verifier.h"
37 #include "llvm/InitializePasses.h"
38 #include "llvm/LTO/LTO.h"
41 #include "llvm/Linker/Linker.h"
42 #include "llvm/MC/MCAsmInfo.h"
43 #include "llvm/MC/MCContext.h"
47 #include "llvm/Support/Host.h"
49 #include "llvm/Support/Signals.h"
56 #include "llvm/Transforms/IPO.h"
61 #include <system_error>
62 using namespace llvm;
63 
65 #ifdef LLVM_VERSION_INFO
66  return PACKAGE_NAME " version " PACKAGE_VERSION ", " LLVM_VERSION_INFO;
67 #else
68  return PACKAGE_NAME " version " PACKAGE_VERSION;
69 #endif
70 }
71 
72 namespace llvm {
74  "lto-discard-value-names",
75  cl::desc("Strip names from Value during LTO (other than GlobalValue)."),
76 #ifdef NDEBUG
77  cl::init(true),
78 #else
79  cl::init(false),
80 #endif
81  cl::Hidden);
82 
84  LTORemarksFilename("lto-pass-remarks-output",
85  cl::desc("Output filename for pass remarks"),
86  cl::value_desc("filename"));
87 
89  "lto-pass-remarks-with-hotness",
90  cl::desc("With PGO, include profile count in optimization remarks"),
91  cl::Hidden);
92 }
93 
95  : Context(Context), MergedModule(new Module("ld-temp.o", Context)),
96  TheLinker(new Linker(*MergedModule)) {
99  initializeLTOPasses();
100 }
101 
103 
104 // Initialize LTO passes. Please keep this function in sync with
105 // PassManagerBuilder::populateLTOPassManager(), and make sure all LTO
106 // passes are initialized.
107 void LTOCodeGenerator::initializeLTOPasses() {
109 
131 }
132 
134  const std::vector<StringRef> &undefs = Mod->getAsmUndefinedRefs();
135  for (int i = 0, e = undefs.size(); i != e; ++i)
136  AsmUndefinedRefs[undefs[i]] = 1;
137 }
138 
140  assert(&Mod->getModule().getContext() == &Context &&
141  "Expected module in same context");
142 
143  bool ret = TheLinker->linkInModule(Mod->takeModule());
144  setAsmUndefinedRefs(Mod);
145 
146  // We've just changed the input, so let's make sure we verify it.
147  HasVerifiedInput = false;
148 
149  return !ret;
150 }
151 
152 void LTOCodeGenerator::setModule(std::unique_ptr<LTOModule> Mod) {
153  assert(&Mod->getModule().getContext() == &Context &&
154  "Expected module in same context");
155 
156  AsmUndefinedRefs.clear();
157 
158  MergedModule = Mod->takeModule();
159  TheLinker = make_unique<Linker>(*MergedModule);
160  setAsmUndefinedRefs(&*Mod);
161 
162  // We've just changed the input, so let's make sure we verify it.
163  HasVerifiedInput = false;
164 }
165 
167  this->Options = Options;
168 }
169 
171  switch (Debug) {
173  EmitDwarfDebugInfo = false;
174  return;
175 
177  EmitDwarfDebugInfo = true;
178  return;
179  }
180  llvm_unreachable("Unknown debug format!");
181 }
182 
184  OptLevel = Level;
185  switch (OptLevel) {
186  case 0:
187  CGOptLevel = CodeGenOpt::None;
188  return;
189  case 1:
190  CGOptLevel = CodeGenOpt::Less;
191  return;
192  case 2:
193  CGOptLevel = CodeGenOpt::Default;
194  return;
195  case 3:
196  CGOptLevel = CodeGenOpt::Aggressive;
197  return;
198  }
199  llvm_unreachable("Unknown optimization level!");
200 }
201 
203  if (!determineTarget())
204  return false;
205 
206  // We always run the verifier once on the merged module.
207  verifyMergedModuleOnce();
208 
209  // mark which symbols can not be internalized
210  applyScopeRestrictions();
211 
212  // create output file
213  std::error_code EC;
214  ToolOutputFile Out(Path, EC, sys::fs::F_None);
215  if (EC) {
216  std::string ErrMsg = "could not open bitcode file for writing: ";
217  ErrMsg += Path.str() + ": " + EC.message();
218  emitError(ErrMsg);
219  return false;
220  }
221 
222  // write bitcode to it
223  WriteBitcodeToFile(*MergedModule, Out.os(), ShouldEmbedUselists);
224  Out.os().close();
225 
226  if (Out.os().has_error()) {
227  std::string ErrMsg = "could not write bitcode file: ";
228  ErrMsg += Path.str() + ": " + Out.os().error().message();
229  emitError(ErrMsg);
230  Out.os().clear_error();
231  return false;
232  }
233 
234  Out.keep();
235  return true;
236 }
237 
238 bool LTOCodeGenerator::compileOptimizedToFile(const char **Name) {
239  // make unique temp output file to put generated code
240  SmallString<128> Filename;
241  int FD;
242 
244  (FileType == TargetMachine::CGFT_AssemblyFile ? "s" : "o");
245 
246  std::error_code EC =
247  sys::fs::createTemporaryFile("lto-llvm", Extension, FD, Filename);
248  if (EC) {
249  emitError(EC.message());
250  return false;
251  }
252 
253  // generate object file
254  ToolOutputFile objFile(Filename, FD);
255 
256  bool genResult = compileOptimized(&objFile.os());
257  objFile.os().close();
258  if (objFile.os().has_error()) {
259  emitError((Twine("could not write object file: ") + Filename + ": " +
260  objFile.os().error().message())
261  .str());
262  objFile.os().clear_error();
263  sys::fs::remove(Twine(Filename));
264  return false;
265  }
266 
267  objFile.keep();
268  if (!genResult) {
269  sys::fs::remove(Twine(Filename));
270  return false;
271  }
272 
273  NativeObjectPath = Filename.c_str();
274  *Name = NativeObjectPath.c_str();
275  return true;
276 }
277 
278 std::unique_ptr<MemoryBuffer>
280  const char *name;
281  if (!compileOptimizedToFile(&name))
282  return nullptr;
283 
284  // read .o file into memory buffer
286  MemoryBuffer::getFile(name, -1, false);
287  if (std::error_code EC = BufferOrErr.getError()) {
288  emitError(EC.message());
289  sys::fs::remove(NativeObjectPath);
290  return nullptr;
291  }
292 
293  // remove temp files
294  sys::fs::remove(NativeObjectPath);
295 
296  return std::move(*BufferOrErr);
297 }
298 
299 bool LTOCodeGenerator::compile_to_file(const char **Name, bool DisableVerify,
300  bool DisableInline,
301  bool DisableGVNLoadPRE,
302  bool DisableVectorization) {
303  if (!optimize(DisableVerify, DisableInline, DisableGVNLoadPRE,
304  DisableVectorization))
305  return false;
306 
307  return compileOptimizedToFile(Name);
308 }
309 
310 std::unique_ptr<MemoryBuffer>
311 LTOCodeGenerator::compile(bool DisableVerify, bool DisableInline,
312  bool DisableGVNLoadPRE, bool DisableVectorization) {
313  if (!optimize(DisableVerify, DisableInline, DisableGVNLoadPRE,
314  DisableVectorization))
315  return nullptr;
316 
317  return compileOptimized();
318 }
319 
320 bool LTOCodeGenerator::determineTarget() {
321  if (TargetMach)
322  return true;
323 
324  TripleStr = MergedModule->getTargetTriple();
325  if (TripleStr.empty()) {
326  TripleStr = sys::getDefaultTargetTriple();
327  MergedModule->setTargetTriple(TripleStr);
328  }
329  llvm::Triple Triple(TripleStr);
330 
331  // create target machine from info for merged modules
332  std::string ErrMsg;
333  MArch = TargetRegistry::lookupTarget(TripleStr, ErrMsg);
334  if (!MArch) {
335  emitError(ErrMsg);
336  return false;
337  }
338 
339  // Construct LTOModule, hand over ownership of module and target. Use MAttr as
340  // the default set of features.
342  Features.getDefaultSubtargetFeatures(Triple);
343  FeatureStr = Features.getString();
344  // Set a default CPU for Darwin triples.
345  if (MCpu.empty() && Triple.isOSDarwin()) {
346  if (Triple.getArch() == llvm::Triple::x86_64)
347  MCpu = "core2";
348  else if (Triple.getArch() == llvm::Triple::x86)
349  MCpu = "yonah";
350  else if (Triple.getArch() == llvm::Triple::aarch64)
351  MCpu = "cyclone";
352  }
353 
354  TargetMach = createTargetMachine();
355  return true;
356 }
357 
358 std::unique_ptr<TargetMachine> LTOCodeGenerator::createTargetMachine() {
359  return std::unique_ptr<TargetMachine>(MArch->createTargetMachine(
360  TripleStr, MCpu, FeatureStr, Options, RelocModel, None, CGOptLevel));
361 }
362 
363 // If a linkonce global is present in the MustPreserveSymbols, we need to make
364 // sure we honor this. To force the compiler to not drop it, we add it to the
365 // "llvm.compiler.used" global.
366 void LTOCodeGenerator::preserveDiscardableGVs(
367  Module &TheModule,
369  std::vector<GlobalValue *> Used;
370  auto mayPreserveGlobal = [&](GlobalValue &GV) {
371  if (!GV.isDiscardableIfUnused() || GV.isDeclaration() ||
372  !mustPreserveGV(GV))
373  return;
374  if (GV.hasAvailableExternallyLinkage())
375  return emitWarning(
376  (Twine("Linker asked to preserve available_externally global: '") +
377  GV.getName() + "'").str());
378  if (GV.hasInternalLinkage())
379  return emitWarning((Twine("Linker asked to preserve internal global: '") +
380  GV.getName() + "'").str());
381  Used.push_back(&GV);
382  };
383  for (auto &GV : TheModule)
384  mayPreserveGlobal(GV);
385  for (auto &GV : TheModule.globals())
386  mayPreserveGlobal(GV);
387  for (auto &GV : TheModule.aliases())
388  mayPreserveGlobal(GV);
389 
390  if (Used.empty())
391  return;
392 
393  appendToCompilerUsed(TheModule, Used);
394 }
395 
396 void LTOCodeGenerator::applyScopeRestrictions() {
397  if (ScopeRestrictionsDone)
398  return;
399 
400  // Declare a callback for the internalize pass that will ask for every
401  // candidate GlobalValue if it can be internalized or not.
402  Mangler Mang;
403  SmallString<64> MangledName;
404  auto mustPreserveGV = [&](const GlobalValue &GV) -> bool {
405  // Unnamed globals can't be mangled, but they can't be preserved either.
406  if (!GV.hasName())
407  return false;
408 
409  // Need to mangle the GV as the "MustPreserveSymbols" StringSet is filled
410  // with the linker supplied name, which on Darwin includes a leading
411  // underscore.
412  MangledName.clear();
413  MangledName.reserve(GV.getName().size() + 1);
414  Mang.getNameWithPrefix(MangledName, &GV, /*CannotUsePrivateLabel=*/false);
415  return MustPreserveSymbols.count(MangledName);
416  };
417 
418  // Preserve linkonce value on linker request
419  preserveDiscardableGVs(*MergedModule, mustPreserveGV);
420 
421  if (!ShouldInternalize)
422  return;
423 
424  if (ShouldRestoreGlobalsLinkage) {
425  // Record the linkage type of non-local symbols so they can be restored
426  // prior
427  // to module splitting.
428  auto RecordLinkage = [&](const GlobalValue &GV) {
429  if (!GV.hasAvailableExternallyLinkage() && !GV.hasLocalLinkage() &&
430  GV.hasName())
431  ExternalSymbols.insert(std::make_pair(GV.getName(), GV.getLinkage()));
432  };
433  for (auto &GV : *MergedModule)
434  RecordLinkage(GV);
435  for (auto &GV : MergedModule->globals())
436  RecordLinkage(GV);
437  for (auto &GV : MergedModule->aliases())
438  RecordLinkage(GV);
439  }
440 
441  // Update the llvm.compiler_used globals to force preserving libcalls and
442  // symbols referenced from asm
443  updateCompilerUsed(*MergedModule, *TargetMach, AsmUndefinedRefs);
444 
445  internalizeModule(*MergedModule, mustPreserveGV);
446 
447  ScopeRestrictionsDone = true;
448 }
449 
450 /// Restore original linkage for symbols that may have been internalized
451 void LTOCodeGenerator::restoreLinkageForExternals() {
452  if (!ShouldInternalize || !ShouldRestoreGlobalsLinkage)
453  return;
454 
455  assert(ScopeRestrictionsDone &&
456  "Cannot externalize without internalization!");
457 
458  if (ExternalSymbols.empty())
459  return;
460 
461  auto externalize = [this](GlobalValue &GV) {
462  if (!GV.hasLocalLinkage() || !GV.hasName())
463  return;
464 
465  auto I = ExternalSymbols.find(GV.getName());
466  if (I == ExternalSymbols.end())
467  return;
468 
469  GV.setLinkage(I->second);
470  };
471 
472  llvm::for_each(MergedModule->functions(), externalize);
473  llvm::for_each(MergedModule->globals(), externalize);
474  llvm::for_each(MergedModule->aliases(), externalize);
475 }
476 
477 void LTOCodeGenerator::verifyMergedModuleOnce() {
478  // Only run on the first call.
479  if (HasVerifiedInput)
480  return;
481  HasVerifiedInput = true;
482 
483  bool BrokenDebugInfo = false;
484  if (verifyModule(*MergedModule, &dbgs(), &BrokenDebugInfo))
485  report_fatal_error("Broken module found, compilation aborted!");
486  if (BrokenDebugInfo) {
487  emitWarning("Invalid debug info found, debug info will be stripped");
488  StripDebugInfo(*MergedModule);
489  }
490 }
491 
492 void LTOCodeGenerator::finishOptimizationRemarks() {
493  if (DiagnosticOutputFile) {
494  DiagnosticOutputFile->keep();
495  // FIXME: LTOCodeGenerator dtor is not invoked on Darwin
496  DiagnosticOutputFile->os().flush();
497  }
498 }
499 
500 /// Optimize merged modules using various IPO passes
501 bool LTOCodeGenerator::optimize(bool DisableVerify, bool DisableInline,
502  bool DisableGVNLoadPRE,
503  bool DisableVectorization) {
504  if (!this->determineTarget())
505  return false;
506 
507  auto DiagFileOrErr = lto::setupOptimizationRemarks(
509  if (!DiagFileOrErr) {
510  errs() << "Error: " << toString(DiagFileOrErr.takeError()) << "\n";
511  report_fatal_error("Can't get an output file for the remarks");
512  }
513  DiagnosticOutputFile = std::move(*DiagFileOrErr);
514 
515  // We always run the verifier once on the merged module, the `DisableVerify`
516  // parameter only applies to subsequent verify.
517  verifyMergedModuleOnce();
518 
519  // Mark which symbols can not be internalized
520  this->applyScopeRestrictions();
521 
522  // Instantiate the pass manager to organize the passes.
523  legacy::PassManager passes;
524 
525  // Add an appropriate DataLayout instance for this module...
526  MergedModule->setDataLayout(TargetMach->createDataLayout());
527 
528  passes.add(
529  createTargetTransformInfoWrapperPass(TargetMach->getTargetIRAnalysis()));
530 
531  Triple TargetTriple(TargetMach->getTargetTriple());
532  PassManagerBuilder PMB;
533  PMB.DisableGVNLoadPRE = DisableGVNLoadPRE;
534  PMB.LoopVectorize = !DisableVectorization;
535  PMB.SLPVectorize = !DisableVectorization;
536  if (!DisableInline)
537  PMB.Inliner = createFunctionInliningPass();
538  PMB.LibraryInfo = new TargetLibraryInfoImpl(TargetTriple);
539  if (Freestanding)
540  PMB.LibraryInfo->disableAllFunctions();
541  PMB.OptLevel = OptLevel;
542  PMB.VerifyInput = !DisableVerify;
543  PMB.VerifyOutput = !DisableVerify;
544 
545  PMB.populateLTOPassManager(passes);
546 
547  // Run our queue of passes all at once now, efficiently.
548  passes.run(*MergedModule);
549 
550  return true;
551 }
552 
554  if (!this->determineTarget())
555  return false;
556 
557  // We always run the verifier once on the merged module. If it has already
558  // been called in optimize(), this call will return early.
559  verifyMergedModuleOnce();
560 
561  legacy::PassManager preCodeGenPasses;
562 
563  // If the bitcode files contain ARC code and were compiled with optimization,
564  // the ObjCARCContractPass must be run, so do it unconditionally here.
565  preCodeGenPasses.add(createObjCARCContractPass());
566  preCodeGenPasses.run(*MergedModule);
567 
568  // Re-externalize globals that may have been internalized to increase scope
569  // for splitting
570  restoreLinkageForExternals();
571 
572  // Do code generation. We need to preserve the module in case the client calls
573  // writeMergedModules() after compilation, but we only need to allow this at
574  // parallelism level 1. This is achieved by having splitCodeGen return the
575  // original module at parallelism level 1 which we then assign back to
576  // MergedModule.
577  MergedModule = splitCodeGen(std::move(MergedModule), Out, {},
578  [&]() { return createTargetMachine(); }, FileType,
579  ShouldRestoreGlobalsLinkage);
580 
581  // If statistics were requested, print them out after codegen.
585 
586  finishOptimizationRemarks();
587 
588  return true;
589 }
590 
591 /// setCodeGenDebugOptions - Set codegen debugging options to aid in debugging
592 /// LTO problems.
594  for (std::pair<StringRef, StringRef> o = getToken(Options); !o.first.empty();
595  o = getToken(o.second))
596  CodegenOptions.push_back(o.first);
597 }
598 
600  // if options were requested, set them
601  if (!CodegenOptions.empty()) {
602  // ParseCommandLineOptions() expects argv[0] to be program name.
603  std::vector<const char *> CodegenArgv(1, "libLLVMLTO");
604  for (std::string &Arg : CodegenOptions)
605  CodegenArgv.push_back(Arg.c_str());
606  cl::ParseCommandLineOptions(CodegenArgv.size(), CodegenArgv.data());
607  }
608 }
609 
610 
612  // Map the LLVM internal diagnostic severity to the LTO diagnostic severity.
614  switch (DI.getSeverity()) {
615  case DS_Error:
616  Severity = LTO_DS_ERROR;
617  break;
618  case DS_Warning:
619  Severity = LTO_DS_WARNING;
620  break;
621  case DS_Remark:
622  Severity = LTO_DS_REMARK;
623  break;
624  case DS_Note:
625  Severity = LTO_DS_NOTE;
626  break;
627  }
628  // Create the string that will be reported to the external diagnostic handler.
629  std::string MsgStorage;
630  raw_string_ostream Stream(MsgStorage);
631  DiagnosticPrinterRawOStream DP(Stream);
632  DI.print(DP);
633  Stream.flush();
634 
635  // If this method has been called it means someone has set up an external
636  // diagnostic handler. Assert on that.
637  assert(DiagHandler && "Invalid diagnostic handler");
638  (*DiagHandler)(Severity, MsgStorage.c_str(), DiagContext);
639 }
640 
641 namespace {
642 struct LTODiagnosticHandler : public DiagnosticHandler {
643  LTOCodeGenerator *CodeGenerator;
644  LTODiagnosticHandler(LTOCodeGenerator *CodeGenPtr)
645  : CodeGenerator(CodeGenPtr) {}
646  bool handleDiagnostics(const DiagnosticInfo &DI) override {
647  CodeGenerator->DiagnosticHandler(DI);
648  return true;
649  }
650 };
651 }
652 
653 void
655  void *Ctxt) {
656  this->DiagHandler = DiagHandler;
657  this->DiagContext = Ctxt;
658  if (!DiagHandler)
659  return Context.setDiagnosticHandler(nullptr);
660  // Register the LTOCodeGenerator stub in the LLVMContext to forward the
661  // diagnostic to the external DiagHandler.
662  Context.setDiagnosticHandler(llvm::make_unique<LTODiagnosticHandler>(this),
663  true);
664 }
665 
666 namespace {
667 class LTODiagnosticInfo : public DiagnosticInfo {
668  const Twine &Msg;
669 public:
670  LTODiagnosticInfo(const Twine &DiagMsg, DiagnosticSeverity Severity=DS_Error)
671  : DiagnosticInfo(DK_Linker, Severity), Msg(DiagMsg) {}
672  void print(DiagnosticPrinter &DP) const override { DP << Msg; }
673 };
674 }
675 
676 void LTOCodeGenerator::emitError(const std::string &ErrMsg) {
677  if (DiagHandler)
678  (*DiagHandler)(LTO_DS_ERROR, ErrMsg.c_str(), DiagContext);
679  else
680  Context.diagnose(LTODiagnosticInfo(ErrMsg));
681 }
682 
683 void LTOCodeGenerator::emitWarning(const std::string &ErrMsg) {
684  if (DiagHandler)
685  (*DiagHandler)(LTO_DS_WARNING, ErrMsg.c_str(), DiagContext);
686  else
687  Context.diagnose(LTODiagnosticInfo(ErrMsg, DS_Warning));
688 }
void setDiagnosticHandler(std::unique_ptr< DiagnosticHandler > &&DH, bool RespectFilters=false)
setDiagnosticHandler - This method sets unique_ptr to object of DiagnosticHandler to provide custom d...
void initializeDCELegacyPassPass(PassRegistry &)
void appendToCompilerUsed(Module &M, ArrayRef< GlobalValue *> Values)
Adds global values to the llvm.compiler.used list.
bool isOSDarwin() const
isOSDarwin - Is this a "Darwin" OS (OS X, iOS, or watchOS).
Definition: Triple.h:474
This is the base class for diagnostic handling in LLVM.
void initializeGlobalOptLegacyPassPass(PassRegistry &)
Represents either an error or a value T.
Definition: ErrorOr.h:56
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:1312
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
LLVM_NODISCARD std::string str() const
str - Get the contents as an std::string.
Definition: StringRef.h:218
LLVMContext & Context
PassManagerBuilder - This class is used to set up a standard optimization sequence for languages like...
void initializeInternalizeLegacyPassPass(PassRegistry &)
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:139
This class represents lattice values for constants.
Definition: AllocatorList.h:23
void getDefaultSubtargetFeatures(const Triple &Triple)
Adds the default features for the specified target triple.
cl::opt< std::string > LTORemarksFilename("lto-pass-remarks-output", cl::desc("Output filename for pass remarks"), cl::value_desc("filename"))
std::unique_ptr< MemoryBuffer > compileOptimized()
Compiles the merged optimized module into a single output file.
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:64
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...
amdgpu Simplify well known AMD library false FunctionCallee Value const Twine & Name
void initializeSimpleInlinerPass(PassRegistry &)
void initializeJumpThreadingPass(PassRegistry &)
std::error_code remove(const Twine &path, bool IgnoreNonExisting=true)
Remove path.
lto_codegen_diagnostic_severity_t
Diagnostic severity.
Definition: lto.h:305
std::string getDefaultTargetTriple()
getDefaultTargetTriple() - Return the default target triple the compiler has been configured to produ...
void enableDebugTypeODRUniquing()
ImmutablePass * createTargetTransformInfoWrapperPass(TargetIRAnalysis TIRA)
Create an analysis pass wrapper around a TTI object.
std::string getString() const
Returns features as a string.
const FeatureBitset Features
An efficient, type-erasing, non-owning reference to a callable.
Definition: STLExtras.h:116
void initializeGlobalDCELegacyPassPass(PassRegistry &)
iterator find(StringRef Key)
Definition: StringMap.h:332
bool addModule(struct LTOModule *)
Merge given module.
Implementation of the target library information.
bool optimize(bool DisableVerify, bool DisableInline, bool DisableGVNLoadPRE, bool DisableVectorization)
Optimizes the merged module.
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:37
static const Target * lookupTarget(const std::string &Triple, std::string &Error)
lookupTarget - Lookup a target based on a target triple.
void reserve(size_type N)
Definition: SmallVector.h:368
void reportAndResetTimings()
If -time-passes has been specified, report the timings immediately and then reset the timers to zero...
std::unique_ptr< Module > takeModule()
Definition: LTOModule.h:117
std::error_code error() const
Definition: raw_ostream.h:445
void setDiscardValueNames(bool Discard)
Set the Context runtime configuration to discard all value name (but GlobalValue).
void initializeReversePostOrderFunctionAttrsLegacyPassPass(PassRegistry &)
static void externalize(GlobalValue *GV)
void initializePruneEHPass(PassRegistry &)
std::string toString(Error E)
Write all error messages (if any) in E to a string.
Definition: Error.h:966
void add(Pass *P) override
Add a pass to the queue of passes to run.
DiagnosticSeverity
Defines the different supported severity of a diagnostic.
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:80
LLVMContext & getContext() const
Get the global data context.
Definition: Module.h:243
void initializeArgPromotionPass(PassRegistry &)
std::unique_ptr< MemoryBuffer > compile(bool DisableVerify, bool DisableInline, bool DisableGVNLoadPRE, bool DisableVectorization)
As with compile_to_file(), this function compiles the merged module into single output file...
Interface for custom diagnostic printing.
This header defines classes/functions to handle pass execution timing information with interfaces for...
bool writeMergedModules(StringRef Path)
Write the merged module to the file specified by the given path.
This class contains a raw_fd_ostream and adds a few extra features commonly needed for compiler-like ...
std::pair< StringRef, StringRef > getToken(StringRef Source, StringRef Delimiters=" \\\)
getToken - This function extracts one token from source, ignoring any leading characters that appear ...
cl::opt< bool > LTOPassRemarksWithHotness("lto-pass-remarks-with-hotness", cl::desc("With PGO, include profile count in optimization remarks"), cl::Hidden)
ArchType getArch() const
getArch - Get the parsed architecture type of this triple.
Definition: Triple.h:289
Pass * createObjCARCContractPass()
static const char * getVersionString()
bool StripDebugInfo(Module &M)
Strip debug info in the module if it exists.
Definition: DebugInfo.cpp:350
This class provides the core functionality of linking in LLVM.
Definition: Linker.h:24
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory)...
Definition: APInt.h:32
lto_debug_model
Definition: lto.h:77
void initializeGVNLegacyPassPass(PassRegistry &)
PassManager manages ModulePassManagers.
initializer< Ty > init(const Ty &Val)
Definition: CommandLine.h:422
This is the base abstract class for diagnostic reporting in the backend.
size_type count(StringRef Key) const
count - Return 1 if the element is in the map, 0 otherwise.
Definition: StringMap.h:358
This is an important class for using LLVM in a threaded context.
Definition: LLVMContext.h:68
This file contains the declarations for the subclasses of Constant, which represent the different fla...
std::error_code getError() const
Definition: ErrorOr.h:159
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.
void initializeSROALegacyPassPass(PassRegistry &)
bool ParseCommandLineOptions(int argc, const char *const *argv, StringRef Overview="", raw_ostream *Errs=nullptr, const char *EnvVar=nullptr)
void setOptLevel(unsigned OptLevel)
amdgpu Simplify well known AMD library false FunctionCallee Value * Arg
static void print(raw_ostream &Out, object::Archive::Kind Kind, T Val)
void setTargetOptions(const TargetOptions &Options)
const Module & getModule() const
Definition: LTOModule.h:114
C++ class which implements the opaque lto_module_t type.
Definition: LTOModule.h:37
void setCodeGenDebugOptions(StringRef Opts)
Pass options to the driver and optimization passes.
void initializeMemCpyOptLegacyPassPass(PassRegistry &)
void initializeConstantMergeLegacyPassPass(PassRegistry &)
bool run(Module &M)
run - Execute all of the passes scheduled for execution.
virtual void print(DiagnosticPrinter &DP) const =0
Print using the given DP a user-friendly message.
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:43
bool has_error() const
Return the value of the flag in this raw_fd_ostream indicating whether an output error has been encou...
Definition: raw_ostream.h:451
C++ class which implements the opaque lto_code_gen_t type.
void initializeGlobalsAAWrapperPassPass(PassRegistry &)
void(* lto_diagnostic_handler_t)(lto_codegen_diagnostic_severity_t severity, const char *diag, void *ctxt)
Diagnostic handler type.
Definition: lto.h:321
const std::vector< StringRef > & getAsmUndefinedRefs()
Definition: LTOModule.h:156
Module.h This file contains the declarations for the Module class.
bool insert(MapEntryTy *KeyValue)
insert - Insert the specified key/value pair into the map.
Definition: StringMap.h:365
raw_ostream & dbgs()
dbgs() - This returns a reference to a raw_ostream for debugging messages.
Definition: Debug.cpp:132
The access may modify the value stored in memory.
Manages the enabling and disabling of subtarget specific features.
void initializeDAHPass(PassRegistry &)
#define NDEBUG
Definition: regutils.h:48
bool verifyModule(const Module &M, raw_ostream *OS=nullptr, bool *BrokenDebugInfo=nullptr)
Check a module for errors.
Definition: Verifier.cpp:4861
Basic diagnostic printer that uses an underlying raw_ostream.
void DiagnosticHandler(const DiagnosticInfo &DI)
cl::opt< bool > LTODiscardValueNames("lto-discard-value-names", cl::desc("Strip names from Value during LTO (other than GlobalValue)."), cl::init(false), cl::Hidden)
std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix, int &ResultFD, SmallVectorImpl< char > &ResultPath)
Create a file in the system temporary directory.
Definition: Path.cpp:810
void initializePostOrderFunctionAttrsLegacyPassPass(PassRegistry &)
void initializeIPSCCPLegacyPassPass(PassRegistry &)
const char * c_str()
Definition: SmallString.h:269
#define I(x, y, z)
Definition: MD5.cpp:58
bool compile_to_file(const char **Name, bool DisableVerify, bool DisableInline, bool DisableGVNLoadPRE, bool DisableVectorization)
Compile the merged module into a single output file; the path to output file is returned to the calle...
DiagnosticSeverity getSeverity() const
static bool mustPreserveGV(const GlobalValue &GV)
Predicate for Internalize pass.
void diagnose(const DiagnosticInfo &DI)
Report a message to the currently installed diagnostic handler.
void initializeInstructionCombiningPassPass(PassRegistry &)
void keep()
Indicate that the tool&#39;s job wrt this output file has been successful and the file should not be dele...
void close()
Manually flush the stream and close the file.
void updateCompilerUsed(Module &TheModule, const TargetMachine &TM, const StringSet<> &AsmUndefinedRefs)
Find all globals in TheModule that are referenced in AsmUndefinedRefs, as well as the user-supplied f...
static ErrorOr< std::unique_ptr< MemoryBuffer > > getFile(const Twine &Filename, int64_t FileSize=-1, bool RequiresNullTerminator=true, bool IsVolatile=false)
Open the specified file as a MemoryBuffer, returning a new MemoryBuffer if successful, otherwise returning null.
void setAsmUndefinedRefs(struct LTOModule *)
void initializeCFGSimplifyPassPass(PassRegistry &)
void PrintStatistics()
Print statistics to the file returned by CreateInfoOutputFile().
Definition: Statistic.cpp:228
bool empty() const
Definition: StringMap.h:110
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
A raw_ostream that writes to an std::string.
Definition: raw_ostream.h:482
Pass * createFunctionInliningPass()
createFunctionInliningPass - Return a new pass object that uses a heuristic to inline direct function...
static const char * name
LTOCodeGenerator(LLVMContext &Context)
static cl::opt< bool, true > Debug("debug", cl::desc("Enable debug output"), cl::Hidden, cl::location(DebugFlag))
void initializeLegacyLICMPassPass(PassRegistry &)
void getNameWithPrefix(raw_ostream &OS, const GlobalValue *GV, bool CannotUsePrivateLabel) const
Print the appropriate prefix and the specified global variable&#39;s name.
Definition: Mangler.cpp:111
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48
PassRegistry - This class manages the registration and intitialization of the pass subsystem as appli...
Definition: PassRegistry.h:38
This pass exposes codegen information to IR-level passes.
void parseCodeGenDebugOptions()
Parse the options set in setCodeGenDebugOptions.
UnaryPredicate for_each(R &&Range, UnaryPredicate P)
Provide wrappers to std::for_each which take ranges instead of having to pass begin/end explicitly...
Definition: STLExtras.h:1178
void setModule(std::unique_ptr< LTOModule > M)
Set the destination module.
void initializeMergedLoadStoreMotionLegacyPassPass(PassRegistry &)
bool internalizeModule(Module &TheModule, std::function< bool(const GlobalValue &)> MustPreserveGV, CallGraph *CG=nullptr)
Helper function to internalize functions and variables in a Module.
Definition: Internalize.h:70
bool AreStatisticsEnabled()
Check if statistics are enabled.
Definition: Statistic.cpp:133
iterator end()
Definition: StringMap.h:317
raw_fd_ostream & os()
Return the contained raw_fd_ostream.
void setDiagnosticHandler(lto_diagnostic_handler_t, void *)
void clear_error()
Set the flag read by has_error() to false.
Definition: raw_ostream.h:462
void setDebugInfo(lto_debug_model)