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/CGData/CodeGenData.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/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/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)
#define	HANDLE_EXTENSION(Ext)

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 bool	isEmptyModule (const Module &Mod)
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 52 of file LTOBackend.cpp.

HANDLE_EXTENSION [1/2]

#define HANDLE_EXTENSION

(

Ext

)

Value:

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

Definition at line 180 of file LTOBackend.cpp.

HANDLE_EXTENSION [2/2]

#define HANDLE_EXTENSION

(

Ext

)

Value:

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

Definition at line 180 of file LTOBackend.cpp.

Enumeration Type Documentation

LTOBitcodeEmbedding

enum class LTOBitcodeEmbedding

strong

Enumerator
DoNotEmbed
EmbedOptimized
EmbedPostMergePreOptimized

Definition at line 54 of file LTOBackend.cpp.

Function Documentation

codegen()

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

static

Definition at line 400 of file LTOBackend.cpp.

References llvm::legacy::PassManager::add(), llvm::sys::path::append(), llvm::lto::Config::CGFileType, llvm::sys::fs::create_directories(), llvm::createImmutableModuleSummaryIndexWrapperPass(), llvm::lto::Config::DwoDir, EmbedBitcode, llvm::embedBitcodeInModule(), EmbedOptimized, llvm::SmallVectorTemplateCommon< T, typename >::empty(), isEmptyModule(), 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().

createTargetMachine()

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

static

Definition at line 202 of file LTOBackend.cpp.

References A(), llvm::MCTargetOptions::ABIName, 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::TargetOptions::MCOptions, llvm::PICLevel::NotPIC, llvm::lto::Config::Options, llvm::Reloc::PIC_, llvm::lto::Config::RelocModel, and llvm::Reloc::Static.

dropDeadSymbols()

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

static

Definition at line 581 of file LTOBackend.cpp.

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

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

initAndLookupTarget()

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

static

Definition at line 529 of file LTOBackend.cpp.

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

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

isEmptyModule()

bool isEmptyModule ( const Module & Mod )

static

Definition at line 357 of file LTOBackend.cpp.

References Mod.

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

RegisterPassPlugins()

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::reportFatalUsageError().

Referenced by runNewPMPasses().

reportOpenError()

void reportOpenError ( StringRef Path, Twine Msg )

static

Definition at line 80 of file LTOBackend.cpp.

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

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

runNewPMPasses()

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

static

Definition at line 239 of file LTOBackend.cpp.

References llvm::lto::Config::AAPipeline, llvm::lto::Config::AddFSDiscriminator, llvm::PassManager< IRUnitT, AnalysisManagerT, ExtraArgTs >::addPass(), CGAM, 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::vfs::getRealFileSystem(), llvm::PGOOptions::IRUse, LAM, llvm_unreachable, MAM, 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, llvm::outs(), 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, RegisterPassPlugins(), llvm::report_fatal_error(), llvm::PassManager< IRUnitT, AnalysisManagerT, ExtraArgTs >::run(), llvm::lto::Config::RunCSIRInstr, llvm::lto::Config::SampleProfile, llvm::PGOOptions::SampleUse, llvm::toString(), and llvm::lto::Config::VerifyEach.

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

splitCodeGen()

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

static

Definition at line 474 of file LTOBackend.cpp.

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