LLVM 22.0.0git
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ThinLTOCodeGenerator.cpp File Reference
#include "llvm/LTO/legacy/ThinLTOCodeGenerator.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Analysis/ModuleSummaryAnalysis.h"
#include "llvm/Analysis/ProfileSummaryInfo.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Bitcode/BitcodeReader.h"
#include "llvm/Bitcode/BitcodeWriter.h"
#include "llvm/Bitcode/BitcodeWriterPass.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DiagnosticPrinter.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/LLVMRemarkStreamer.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Mangler.h"
#include "llvm/IR/PassTimingInfo.h"
#include "llvm/IR/Verifier.h"
#include "llvm/IRReader/IRReader.h"
#include "llvm/LTO/LTO.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Object/IRObjectFile.h"
#include "llvm/Passes/PassBuilder.h"
#include "llvm/Passes/StandardInstrumentations.h"
#include "llvm/Remarks/HotnessThresholdParser.h"
#include "llvm/Support/CachePruning.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/SHA1.h"
#include "llvm/Support/SmallVectorMemoryBuffer.h"
#include "llvm/Support/ThreadPool.h"
#include "llvm/Support/Threading.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/TargetParser/SubtargetFeature.h"
#include "llvm/Transforms/IPO/FunctionAttrs.h"
#include "llvm/Transforms/IPO/FunctionImport.h"
#include "llvm/Transforms/IPO/Internalize.h"
#include "llvm/Transforms/IPO/WholeProgramDevirt.h"
#include "llvm/Transforms/Utils/FunctionImportUtils.h"
#include <unistd.h>

Go to the source code of this file.

Namespaces

namespace  llvm
 This is an optimization pass for GlobalISel generic memory operations.

Macros

#define DEBUG_TYPE   "thinlto"

Functions

static void saveTempBitcode (const Module &TheModule, StringRef TempDir, unsigned count, StringRef Suffix)
static const GlobalValueSummary * getFirstDefinitionForLinker (const GlobalValueSummaryList &GVSummaryList)
static void computePrevailingCopies (const ModuleSummaryIndex &Index, DenseMap< GlobalValue::GUID, const GlobalValueSummary * > &PrevailingCopy)
static StringMap< lto::InputFile * > generateModuleMap (std::vector< std::unique_ptr< lto::InputFile > > &Modules)
static void promoteModule (Module &TheModule, const ModuleSummaryIndex &Index, bool ClearDSOLocalOnDeclarations)
static void verifyLoadedModule (Module &TheModule)
 Verify the module and strip broken debug info.
static std::unique_ptr< Module > loadModuleFromInput (lto::InputFile *Input, LLVMContext &Context, bool Lazy, bool IsImporting)
static void crossImportIntoModule (Module &TheModule, const ModuleSummaryIndex &Index, StringMap< lto::InputFile * > &ModuleMap, const FunctionImporter::ImportMapTy &ImportList, bool ClearDSOLocalOnDeclarations)
static void optimizeModule (Module &TheModule, TargetMachine &TM, unsigned OptLevel, bool Freestanding, bool DebugPassManager, ModuleSummaryIndex *Index)
static void addUsedSymbolToPreservedGUID (const lto::InputFile &File, DenseSet< GlobalValue::GUID > &PreservedGUID)
static void computeGUIDPreservedSymbols (const lto::InputFile &File, const StringSet<> &PreservedSymbols, const Triple &TheTriple, DenseSet< GlobalValue::GUID > &GUIDs)
static DenseSet< GlobalValue::GUID > computeGUIDPreservedSymbols (const lto::InputFile &File, const StringSet<> &PreservedSymbols, const Triple &TheTriple)
static std::unique_ptr< MemoryBuffer > codegenModule (Module &TheModule, TargetMachine &TM)
static std::unique_ptr< MemoryBuffer > ProcessThinLTOModule (Module &TheModule, ModuleSummaryIndex &Index, StringMap< lto::InputFile * > &ModuleMap, TargetMachine &TM, const FunctionImporter::ImportMapTy &ImportList, const FunctionImporter::ExportSetTy &ExportList, const DenseSet< GlobalValue::GUID > &GUIDPreservedSymbols, const GVSummaryMapTy &DefinedGlobals, const ThinLTOCodeGenerator::CachingOptions &CacheOptions, bool DisableCodeGen, StringRef SaveTempsDir, bool Freestanding, unsigned OptLevel, unsigned count, bool DebugPassManager)
static void resolvePrevailingInIndex (ModuleSummaryIndex &Index, StringMap< std::map< GlobalValue::GUID, GlobalValue::LinkageTypes > > &ResolvedODR, const DenseSet< GlobalValue::GUID > &GUIDPreservedSymbols, const DenseMap< GlobalValue::GUID, const GlobalValueSummary * > &PrevailingCopy)
 Resolve prevailing symbols.
static void initTMBuilder (TargetMachineBuilder &TMBuilder, const Triple &TheTriple)
static void computeDeadSymbolsInIndex (ModuleSummaryIndex &Index, const DenseSet< GlobalValue::GUID > &GUIDPreservedSymbols)

Variables

static cl::opt< int > ThreadCount ("threads", cl::init(0))

Macro Definition Documentation

◆ DEBUG_TYPE

#define DEBUG_TYPE   "thinlto"

Definition at line 71 of file ThinLTOCodeGenerator.cpp.

Function Documentation

◆ addUsedSymbolToPreservedGUID()

void addUsedSymbolToPreservedGUID ( const lto::InputFile & File,
DenseSet< GlobalValue::GUID > & PreservedGUID )
static

Definition at line 290 of file ThinLTOCodeGenerator.cpp.

References llvm::GlobalValue::getGUIDAssumingExternalLinkage(), and llvm::detail::DenseSetImpl< ValueT, MapTy, ValueInfoT >::insert().

Referenced by llvm::ThinLTOCodeGenerator::crossModuleImport(), llvm::ThinLTOCodeGenerator::emitImports(), llvm::ThinLTOCodeGenerator::gatherImportedSummariesForModule(), llvm::ThinLTOCodeGenerator::internalize(), llvm::ThinLTOCodeGenerator::promote(), and llvm::ThinLTOCodeGenerator::run().

◆ codegenModule()

std::unique_ptr< MemoryBuffer > codegenModule ( Module & TheModule,
TargetMachine & TM )
static

Definition at line 324 of file ThinLTOCodeGenerator.cpp.

References llvm::ObjectFile, llvm::report_fatal_error(), and llvm::legacy::PassManager::run().

Referenced by ProcessThinLTOModule(), and llvm::ThinLTOCodeGenerator::run().

◆ computeDeadSymbolsInIndex()

void computeDeadSymbolsInIndex ( ModuleSummaryIndex & Index,
const DenseSet< GlobalValue::GUID > & GUIDPreservedSymbols )
static

Definition at line 649 of file ThinLTOCodeGenerator.cpp.

References llvm::computeDeadSymbolsWithConstProp(), G, and llvm::Unknown.

Referenced by llvm::ThinLTOCodeGenerator::crossModuleImport(), llvm::ThinLTOCodeGenerator::emitImports(), llvm::ThinLTOCodeGenerator::gatherImportedSummariesForModule(), llvm::ThinLTOCodeGenerator::internalize(), llvm::ThinLTOCodeGenerator::promote(), and llvm::ThinLTOCodeGenerator::run().

◆ computeGUIDPreservedSymbols() [1/2]

DenseSet< GlobalValue::GUID > computeGUIDPreservedSymbols ( const lto::InputFile & File,
const StringSet<> & PreservedSymbols,
const Triple & TheTriple )
static

Definition at line 315 of file ThinLTOCodeGenerator.cpp.

References computeGUIDPreservedSymbols(), and llvm::StringMapImpl::size().

◆ computeGUIDPreservedSymbols() [2/2]

void computeGUIDPreservedSymbols ( const lto::InputFile & File,
const StringSet<> & PreservedSymbols,
const Triple & TheTriple,
DenseSet< GlobalValue::GUID > & GUIDs )
static

Definition at line 300 of file ThinLTOCodeGenerator.cpp.

References llvm::StringMap< ValueTy, AllocatorTy >::count(), llvm::GlobalValue::ExternalLinkage, llvm::GlobalValue::getGlobalIdentifier(), llvm::GlobalValue::getGUIDAssumingExternalLinkage(), and llvm::detail::DenseSetImpl< ValueT, MapTy, ValueInfoT >::insert().

Referenced by computeGUIDPreservedSymbols(), llvm::ThinLTOCodeGenerator::crossModuleImport(), llvm::ThinLTOCodeGenerator::emitImports(), llvm::ThinLTOCodeGenerator::gatherImportedSummariesForModule(), llvm::ThinLTOCodeGenerator::internalize(), llvm::ThinLTOCodeGenerator::promote(), and llvm::ThinLTOCodeGenerator::run().

◆ computePrevailingCopies()

void computePrevailingCopies ( const ModuleSummaryIndex & Index,
DenseMap< GlobalValue::GUID, const GlobalValueSummary * > & PrevailingCopy )
static

Definition at line 131 of file ThinLTOCodeGenerator.cpp.

References getFirstDefinitionForLinker(), and I.

Referenced by llvm::ThinLTOCodeGenerator::crossModuleImport(), llvm::ThinLTOCodeGenerator::emitImports(), llvm::ThinLTOCodeGenerator::gatherImportedSummariesForModule(), llvm::ThinLTOCodeGenerator::internalize(), llvm::ThinLTOCodeGenerator::promote(), and llvm::ThinLTOCodeGenerator::run().

◆ crossImportIntoModule()

void crossImportIntoModule ( Module & TheModule,
const ModuleSummaryIndex & Index,
StringMap< lto::InputFile * > & ModuleMap,
const FunctionImporter::ImportMapTy & ImportList,
bool ClearDSOLocalOnDeclarations )
static

Definition at line 209 of file ThinLTOCodeGenerator.cpp.

References llvm::Module::getContext(), llvm::handleAllErrors(), llvm::FunctionImporter::importFunctions(), loadModuleFromInput(), llvm::report_fatal_error(), and verifyLoadedModule().

Referenced by llvm::ThinLTOCodeGenerator::crossModuleImport(), and ProcessThinLTOModule().

◆ generateModuleMap()

StringMap< lto::InputFile * > generateModuleMap ( std::vector< std::unique_ptr< lto::InputFile > > & Modules)
static

Definition at line 146 of file ThinLTOCodeGenerator.cpp.

References assert(), llvm::StringMap< ValueTy, AllocatorTy >::contains(), llvm::dbgs(), and LLVM_DEBUG.

Referenced by llvm::ThinLTOCodeGenerator::crossModuleImport(), and llvm::ThinLTOCodeGenerator::run().

◆ getFirstDefinitionForLinker()

const GlobalValueSummary * getFirstDefinitionForLinker ( const GlobalValueSummaryList & GVSummaryList)
static

Definition at line 105 of file ThinLTOCodeGenerator.cpp.

References llvm::find_if(), llvm::GlobalValue::isAvailableExternallyLinkage(), llvm::GlobalValue::isWeakForLinker(), and Linkage.

Referenced by computePrevailingCopies().

◆ initTMBuilder()

void initTMBuilder ( TargetMachineBuilder & TMBuilder,
const Triple & TheTriple )
static

Definition at line 534 of file ThinLTOCodeGenerator.cpp.

References llvm::lto::getThinLTODefaultCPU(), llvm::ThinLTOCodeGeneratorImpl::TargetMachineBuilder::MCpu, and llvm::ThinLTOCodeGeneratorImpl::TargetMachineBuilder::TheTriple.

Referenced by llvm::ThinLTOCodeGenerator::addModule(), llvm::ThinLTOCodeGenerator::internalize(), and llvm::ThinLTOCodeGenerator::optimize().

◆ loadModuleFromInput()

std::unique_ptr< Module > loadModuleFromInput ( lto::InputFile * Input,
LLVMContext & Context,
bool Lazy,
bool IsImporting )
static

Definition at line 185 of file ThinLTOCodeGenerator.cpp.

References llvm::Expected< T >::get(), llvm::handleAllErrors(), Mod, llvm::report_fatal_error(), llvm::Expected< T >::takeError(), and verifyLoadedModule().

Referenced by crossImportIntoModule(), and llvm::ThinLTOCodeGenerator::run().

◆ optimizeModule()

void optimizeModule ( Module & TheModule,
TargetMachine & TM,
unsigned OptLevel,
bool Freestanding,
bool DebugPassManager,
ModuleSummaryIndex * Index )
static

Definition at line 233 of file ThinLTOCodeGenerator.cpp.

References llvm::PassManager< IRUnitT, AnalysisManagerT, ExtraArgTs >::addPass(), CGAM, FAM, llvm::Module::getContext(), LAM, llvm_unreachable, llvm::PipelineTuningOptions::LoopVectorization, MAM, llvm::OptimizationLevel::O0, llvm::OptimizationLevel::O1, llvm::OptimizationLevel::O2, llvm::OptimizationLevel::O3, PB(), PIC, llvm::PassManager< IRUnitT, AnalysisManagerT, ExtraArgTs >::run(), and llvm::PipelineTuningOptions::SLPVectorization.

Referenced by llvm::ThinLTOCodeGenerator::optimize(), and ProcessThinLTOModule().

◆ ProcessThinLTOModule()

std::unique_ptr< MemoryBuffer > ProcessThinLTOModule ( Module & TheModule,
ModuleSummaryIndex & Index,
StringMap< lto::InputFile * > & ModuleMap,
TargetMachine & TM,
const FunctionImporter::ImportMapTy & ImportList,
const FunctionImporter::ExportSetTy & ExportList,
const DenseSet< GlobalValue::GUID > & GUIDPreservedSymbols,
const GVSummaryMapTy & DefinedGlobals,
const ThinLTOCodeGenerator::CachingOptions & CacheOptions,
bool DisableCodeGen,
StringRef SaveTempsDir,
bool Freestanding,
unsigned OptLevel,
unsigned count,
bool DebugPassManager )
static

Definition at line 426 of file ThinLTOCodeGenerator.cpp.

References llvm::buildModuleSummaryIndex(), codegenModule(), llvm::count(), crossImportIntoModule(), llvm::PIELevel::Default, llvm::detail::DenseSetImpl< ValueT, MapTy, ValueInfoT >::empty(), llvm::Module::getPIELevel(), optimizeModule(), promoteModule(), saveTempBitcode(), llvm::StringMapImpl::size(), llvm::Reloc::Static, llvm::thinLTOFinalizeInModule(), llvm::thinLTOInternalizeModule(), llvm::updatePublicTypeTestCalls(), and llvm::WriteBitcodeToFile().

Referenced by llvm::ThinLTOCodeGenerator::run().

◆ promoteModule()

void promoteModule ( Module & TheModule,
const ModuleSummaryIndex & Index,
bool ClearDSOLocalOnDeclarations )
static

Definition at line 157 of file ThinLTOCodeGenerator.cpp.

References llvm::renameModuleForThinLTO().

Referenced by llvm::ThinLTOCodeGenerator::internalize(), ProcessThinLTOModule(), and llvm::ThinLTOCodeGenerator::promote().

◆ resolvePrevailingInIndex()

void resolvePrevailingInIndex ( ModuleSummaryIndex & Index,
StringMap< std::map< GlobalValue::GUID, GlobalValue::LinkageTypes > > & ResolvedODR,
const DenseSet< GlobalValue::GUID > & GUIDPreservedSymbols,
const DenseMap< GlobalValue::GUID, const GlobalValueSummary * > & PrevailingCopy )
static

Resolve prevailing symbols.

Record resolutions in the ResolvedODR map for caching, and in the Index for application during the ThinLTO backends. This is needed for correctness for exported symbols (ensure at least one copy kept) and a compile-time optimization (to drop duplicate copies when possible).

Definition at line 505 of file ThinLTOCodeGenerator.cpp.

References llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::end(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::find(), and llvm::thinLTOResolvePrevailingInIndex().

Referenced by llvm::ThinLTOCodeGenerator::internalize(), llvm::ThinLTOCodeGenerator::promote(), and llvm::ThinLTOCodeGenerator::run().

◆ saveTempBitcode()

void saveTempBitcode ( const Module & TheModule,
StringRef TempDir,
unsigned count,
StringRef Suffix )
static

Definition at line 90 of file ThinLTOCodeGenerator.cpp.

References llvm::count(), llvm::StringRef::empty(), llvm::sys::fs::OF_None, llvm::report_fatal_error(), and llvm::WriteBitcodeToFile().

Referenced by ProcessThinLTOModule(), and llvm::ThinLTOCodeGenerator::run().

◆ verifyLoadedModule()

void verifyLoadedModule ( Module & TheModule)
static

Verify the module and strip broken debug info.

Definition at line 174 of file ThinLTOCodeGenerator.cpp.

References llvm::dbgs(), llvm::LLVMContext::diagnose(), llvm::DS_Warning, llvm::Module::getContext(), llvm::report_fatal_error(), llvm::StripDebugInfo(), and llvm::verifyModule().

Referenced by crossImportIntoModule(), and loadModuleFromInput().

Variable Documentation

◆ ThreadCount

cl::opt< int > ThreadCount("threads", cl::init(0)) ( "threads" ,
cl::init(0)  )
static

Referenced by llvm::hardware_concurrency(), llvm::heavyweight_hardware_concurrency(), llvm::ThinLTOCodeGenerator::run(), llvm::SingleThreadExecutor::SingleThreadExecutor(), and splitCodeGen().

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