LTOBackend.cpp File Reference

#include "llvm/LTO/LTOBackend.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/CGSCCPassManager.h"
#include "llvm/Analysis/ModuleSummaryAnalysis.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Bitcode/BitcodeReader.h"
#include "llvm/Bitcode/BitcodeWriter.h"
#include "llvm/IR/LLVMRemarkStreamer.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/PassManager.h"
#include "llvm/IR/Verifier.h"
#include "llvm/LTO/LTO.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Object/ModuleSymbolTable.h"
#include "llvm/Passes/PassBuilder.h"
#include "llvm/Passes/PassPlugin.h"
#include "llvm/Passes/StandardInstrumentations.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/ThreadPool.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/VirtualFileSystem.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/TargetParser/SubtargetFeature.h"
#include "llvm/Transforms/IPO/WholeProgramDevirt.h"
#include "llvm/Transforms/Scalar/LoopPassManager.h"
#include "llvm/Transforms/Utils/FunctionImportUtils.h"
#include "llvm/Transforms/Utils/SplitModule.h"
#include <optional>
#include "llvm/Support/Extension.def"

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   "lto-backend"
#define	HANDLE_EXTENSION(Ext)    llvm::PassPluginLibraryInfo get##Ext##PluginInfo();
#define	HANDLE_EXTENSION(Ext)    get##Ext##PluginInfo().RegisterPassBuilderCallbacks(PB);

Enumerations
enum class	LTOBitcodeEmbedding { DoNotEmbed = 0 , EmbedOptimized = 1 , EmbedPostMergePreOptimized = 2 }

Functions
static void	reportOpenError (StringRef Path, Twine Msg)
static void	RegisterPassPlugins (ArrayRef< std::string > PassPlugins, PassBuilder &PB)
static std::unique_ptr< TargetMachine >	createTargetMachine (const Config &Conf, const Target *TheTarget, Module &M)
static void	runNewPMPasses (const Config &Conf, Module &Mod, TargetMachine *TM, unsigned OptLevel, bool IsThinLTO, ModuleSummaryIndex *ExportSummary, const ModuleSummaryIndex *ImportSummary)
static void	codegen (const Config &Conf, TargetMachine *TM, AddStreamFn AddStream, unsigned Task, Module &Mod, const ModuleSummaryIndex &CombinedIndex)
static void	splitCodeGen (const Config &C, TargetMachine *TM, AddStreamFn AddStream, unsigned ParallelCodeGenParallelismLevel, Module &Mod, const ModuleSummaryIndex &CombinedIndex)
static Expected< const Target * >	initAndLookupTarget (const Config &C, Module &Mod)
static void	dropDeadSymbols (Module &Mod, const GVSummaryMapTy &DefinedGlobals, const ModuleSummaryIndex &Index)

Variables
static cl::opt< LTOBitcodeEmbedding >	EmbedBitcode ("lto-embed-bitcode", cl::init(LTOBitcodeEmbedding::DoNotEmbed), cl::values(clEnumValN(LTOBitcodeEmbedding::DoNotEmbed, "none", "Do not embed"), clEnumValN(LTOBitcodeEmbedding::EmbedOptimized, "optimized", "Embed after all optimization passes"), clEnumValN(LTOBitcodeEmbedding::EmbedPostMergePreOptimized, "post-merge-pre-opt", "Embed post merge, but before optimizations")), cl::desc("Embed LLVM bitcode in object files produced by LTO"))
static cl::opt< bool >	ThinLTOAssumeMerged ("thinlto-assume-merged", cl::init(false), cl::desc("Assume the input has already undergone ThinLTO function " "importing and the other pre-optimization pipeline changes."))
cl::opt< bool >	llvm::NoPGOWarnMismatch

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "lto-backend"

Definition at line 53 of file LTOBackend.cpp.

HANDLE_EXTENSION [1/2]

#define HANDLE_EXTENSION

(

Ext

)

llvm::PassPluginLibraryInfo get##Ext##PluginInfo();

Definition at line 181 of file LTOBackend.cpp.

HANDLE_EXTENSION [2/2]

#define HANDLE_EXTENSION

(

Ext

)

get##Ext##PluginInfo().RegisterPassBuilderCallbacks(PB);

Definition at line 181 of file LTOBackend.cpp.

Enumeration Type Documentation

LTOBitcodeEmbedding

enum class LTOBitcodeEmbedding

strong

Enumerator
DoNotEmbed
EmbedOptimized
EmbedPostMergePreOptimized

Definition at line 55 of file LTOBackend.cpp.

Function Documentation

codegen()

static void codegen ( const Config &  Conf, TargetMachine *  TM, AddStreamFn  AddStream, unsigned  Task, Module &  Mod, const ModuleSummaryIndex &  CombinedIndex  )

static

Definition at line 378 of file LTOBackend.cpp.

References llvm::legacy::PassManager::add(), llvm::sys::path::append(), llvm::lto::Config::CGFileType, codegen(), llvm::sys::fs::create_directories(), llvm::createImmutableModuleSummaryIndexWrapperPass(), llvm::lto::Config::DwoDir, EmbedBitcode, llvm::embedBitcodeInModule(), llvm::SmallVectorBase< Size_T >::empty(), llvm::Mod, llvm::sys::fs::OF_None, llvm::lto::Config::PreCodeGenModuleHook, llvm::lto::Config::PreCodeGenPassesHook, llvm::report_fatal_error(), llvm::legacy::PassManager::run(), llvm::lto::Config::SplitDwarfFile, llvm::lto::Config::SplitDwarfOutput, and llvm::Expected< T >::takeError().

Referenced by llvm::lto::backend(), codegen(), splitCodeGen(), and llvm::lto::thinBackend().

createTargetMachine()

static std::unique_ptr< TargetMachine > createTargetMachine ( const Config &  Conf, const Target *  TheTarget, Module &  M  )

static

Definition at line 201 of file LTOBackend.cpp.

References A, llvm::SubtargetFeatures::AddFeature(), assert(), llvm::lto::Config::CGOptLevel, llvm::lto::Config::CodeModel, llvm::lto::Config::CPU, llvm::Target::createTargetMachine(), llvm::SubtargetFeatures::getDefaultSubtargetFeatures(), llvm::SubtargetFeatures::getString(), llvm::lto::Config::MAttrs, llvm::PICLevel::NotPIC, llvm::lto::Config::Options, llvm::Reloc::PIC_, llvm::lto::Config::RelocModel, and llvm::Reloc::Static.

dropDeadSymbols()

static void dropDeadSymbols ( Module &  Mod, const GVSummaryMapTy &  DefinedGlobals, const ModuleSummaryIndex &  Index  )

static

Definition at line 542 of file LTOBackend.cpp.

References llvm::convertToDeclaration(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::lookup(), and llvm::Mod.

Referenced by llvm::lto::thinBackend().

initAndLookupTarget()

static Expected< const Target * > initAndLookupTarget ( const Config &  C, Module &  Mod  )

static

Definition at line 491 of file LTOBackend.cpp.

References llvm::CallingConv::C, llvm::inconvertibleErrorCode(), llvm::TargetRegistry::lookupTarget(), and llvm::Mod.

Referenced by llvm::lto::backend(), and llvm::lto::thinBackend().

RegisterPassPlugins()

static void RegisterPassPlugins ( ArrayRef< std::string >  PassPlugins, PassBuilder &  PB  )

static

Definition at line 185 of file LTOBackend.cpp.

References llvm::PassPlugin::Load(), PB(), llvm::PassPlugin::registerPassBuilderCallbacks(), and llvm::report_fatal_error().

Referenced by runNewPMPasses().

reportOpenError()

static void reportOpenError ( StringRef  Path, Twine  Msg  )

static

Definition at line 81 of file LTOBackend.cpp.

References llvm::errs(), and llvm::raw_ostream::flush().

Referenced by llvm::lto::Config::addSaveTemps().

runNewPMPasses()

static void runNewPMPasses ( const Config &  Conf, Module &  Mod, TargetMachine *  TM, unsigned  OptLevel, bool  IsThinLTO, ModuleSummaryIndex *  ExportSummary, const ModuleSummaryIndex *  ImportSummary  )

static

Definition at line 233 of file LTOBackend.cpp.

References llvm::lto::Config::AAPipeline, llvm::lto::Config::AddFSDiscriminator, llvm::PassManager< IRUnitT, AnalysisManagerT, ExtraArgTs >::addPass(), llvm::PassBuilder::buildLTODefaultPipeline(), llvm::PassBuilder::buildThinLTODefaultPipeline(), CGAM, llvm::PassBuilder::crossRegisterProxies(), llvm::PGOOptions::CSIRInstr, llvm::lto::Config::CSIRProfile, llvm::PGOOptions::CSIRUse, llvm::lto::Config::DebugPassManager, llvm::PGOOptions::Default, llvm::lto::Config::DisableVerify, FAM, llvm::lto::Config::Freestanding, llvm::PassInstrumentationCallbacks::getPassNameForClassName(), llvm::vfs::getRealFileSystem(), llvm::PGOOptions::IRUse, LAM, llvm_unreachable, MAM, llvm::Mod, llvm::PGOOptions::NoAction, llvm::PGOOptions::NoCSAction, llvm::NoPGOWarnMismatch, llvm::OptimizationLevel::O0, llvm::OptimizationLevel::O1, llvm::OptimizationLevel::O2, llvm::OptimizationLevel::O3, llvm::lto::Config::OptPipeline, OS, llvm::outs(), llvm::PassBuilder::parseAAPipeline(), llvm::PassBuilder::parsePassPipeline(), PassName, llvm::lto::Config::PassPlugins, PB(), llvm::lto::Config::PGOWarnMismatch, PIC, llvm::PassManager< IRUnitT, AnalysisManagerT, ExtraArgTs >::printPipeline(), llvm::PrintPipelinePasses, llvm::lto::Config::ProfileRemapping, llvm::lto::Config::PTO, llvm::PassBuilder::registerCGSCCAnalyses(), llvm::PassBuilder::registerFunctionAnalyses(), llvm::PassBuilder::registerLoopAnalyses(), llvm::PassBuilder::registerModuleAnalyses(), llvm::AnalysisManager< IRUnitT, ExtraArgTs >::registerPass(), RegisterPassPlugins(), llvm::report_fatal_error(), llvm::PassManager< IRUnitT, AnalysisManagerT, ExtraArgTs >::run(), llvm::lto::Config::RunCSIRInstr, llvm::lto::Config::SampleProfile, llvm::PGOOptions::SampleUse, llvm::dwarf::toString(), and llvm::lto::Config::VerifyEach.

Referenced by llvm::lto::opt().

splitCodeGen()

static void splitCodeGen ( const Config &  C, TargetMachine *  TM, AddStreamFn  AddStream, unsigned  ParallelCodeGenParallelismLevel, Module &  Mod, const ModuleSummaryIndex &  CombinedIndex  )

static

Definition at line 436 of file LTOBackend.cpp.

References llvm::ThreadPoolInterface::async(), llvm::CallingConv::C, codegen(), createTargetMachine(), llvm::Expected< T >::get(), llvm::heavyweight_hardware_concurrency(), llvm::Mod, llvm::parseBitcodeFile(), llvm::report_fatal_error(), llvm::SplitModule(), llvm::SmallString< InternalLen >::str(), llvm::SingleThreadExecutor::wait(), and llvm::WriteBitcodeToFile().

Referenced by llvm::lto::backend().

Variable Documentation

EmbedBitcode

cl::opt< LTOBitcodeEmbedding > EmbedBitcode("lto-embed-bitcode", cl::init(LTOBitcodeEmbedding::DoNotEmbed), cl::values(clEnumValN(LTOBitcodeEmbedding::DoNotEmbed, "none", "Do not embed"), clEnumValN(LTOBitcodeEmbedding::EmbedOptimized, "optimized", "Embed after all optimization passes"), clEnumValN(LTOBitcodeEmbedding::EmbedPostMergePreOptimized, "post-merge-pre-opt", "Embed post merge, but before optimizations")), cl::desc("Embed LLVM bitcode in object files produced by LTO")) ( "lto-embed-bitcode"  , cl::init(LTOBitcodeEmbedding::DoNotEmbed)  , cl::values(clEnumValN(LTOBitcodeEmbedding::DoNotEmbed, "none", "Do not embed"), clEnumValN(LTOBitcodeEmbedding::EmbedOptimized, "optimized", "Embed after all optimization passes"), clEnumValN(LTOBitcodeEmbedding::EmbedPostMergePreOptimized, "post-merge-pre-opt", "Embed post merge, but before optimizations"))  , cl::desc("Embed LLVM bitcode in object files produced by LTO")    )

static

Referenced by codegen(), llvm::embedBitcodeInModule(), and llvm::lto::opt().

ThinLTOAssumeMerged

cl::opt< bool > ThinLTOAssumeMerged("thinlto-assume-merged", cl::init(false), cl::desc("Assume the input has already undergone ThinLTO function " "importing and the other pre-optimization pipeline changes.")) ( "thinlto-assume-merged"  , cl::init(false)  , cl::desc("Assume the input has already undergone ThinLTO function " "importing and the other pre-optimization pipeline changes.")    )

static

Referenced by llvm::lto::findThinLTOModule(), llvm::lto::initImportList(), and llvm::lto::thinBackend().