529 lines
19 KiB
C++
529 lines
19 KiB
C++
//===-LTOBackend.cpp - LLVM Link Time Optimizer Backend -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the "backend" phase of LTO, i.e. it performs
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// optimization and code generation on a loaded module. It is generally used
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// internally by the LTO class but can also be used independently, for example
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// to implement a standalone ThinLTO backend.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/LTO/LTOBackend.h"
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#include "llvm/Analysis/AliasAnalysis.h"
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#include "llvm/Analysis/CGSCCPassManager.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/Bitcode/BitcodeReader.h"
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#include "llvm/Bitcode/BitcodeWriter.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/PassManager.h"
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#include "llvm/IR/Verifier.h"
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#include "llvm/LTO/LTO.h"
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#include "llvm/MC/SubtargetFeature.h"
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#include "llvm/Object/ModuleSymbolTable.h"
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#include "llvm/Passes/PassBuilder.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/Program.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/ThreadPool.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/IPO/PassManagerBuilder.h"
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#include "llvm/Transforms/Scalar/LoopPassManager.h"
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#include "llvm/Transforms/Utils/FunctionImportUtils.h"
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#include "llvm/Transforms/Utils/SplitModule.h"
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using namespace llvm;
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using namespace lto;
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LLVM_ATTRIBUTE_NORETURN static void reportOpenError(StringRef Path, Twine Msg) {
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errs() << "failed to open " << Path << ": " << Msg << '\n';
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errs().flush();
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exit(1);
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}
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Error Config::addSaveTemps(std::string OutputFileName,
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bool UseInputModulePath) {
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ShouldDiscardValueNames = false;
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std::error_code EC;
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ResolutionFile = llvm::make_unique<raw_fd_ostream>(
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OutputFileName + "resolution.txt", EC, sys::fs::OpenFlags::F_Text);
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if (EC)
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return errorCodeToError(EC);
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auto setHook = [&](std::string PathSuffix, ModuleHookFn &Hook) {
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// Keep track of the hook provided by the linker, which also needs to run.
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ModuleHookFn LinkerHook = Hook;
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Hook = [=](unsigned Task, const Module &M) {
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// If the linker's hook returned false, we need to pass that result
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// through.
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if (LinkerHook && !LinkerHook(Task, M))
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return false;
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std::string PathPrefix;
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// If this is the combined module (not a ThinLTO backend compile) or the
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// user hasn't requested using the input module's path, emit to a file
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// named from the provided OutputFileName with the Task ID appended.
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if (M.getModuleIdentifier() == "ld-temp.o" || !UseInputModulePath) {
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PathPrefix = OutputFileName;
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if (Task != (unsigned)-1)
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PathPrefix += utostr(Task) + ".";
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} else
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PathPrefix = M.getModuleIdentifier() + ".";
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std::string Path = PathPrefix + PathSuffix + ".bc";
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std::error_code EC;
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raw_fd_ostream OS(Path, EC, sys::fs::OpenFlags::F_None);
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// Because -save-temps is a debugging feature, we report the error
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// directly and exit.
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if (EC)
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reportOpenError(Path, EC.message());
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WriteBitcodeToFile(M, OS, /*ShouldPreserveUseListOrder=*/false);
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return true;
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};
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};
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setHook("0.preopt", PreOptModuleHook);
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setHook("1.promote", PostPromoteModuleHook);
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setHook("2.internalize", PostInternalizeModuleHook);
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setHook("3.import", PostImportModuleHook);
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setHook("4.opt", PostOptModuleHook);
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setHook("5.precodegen", PreCodeGenModuleHook);
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CombinedIndexHook = [=](const ModuleSummaryIndex &Index) {
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std::string Path = OutputFileName + "index.bc";
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std::error_code EC;
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raw_fd_ostream OS(Path, EC, sys::fs::OpenFlags::F_None);
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// Because -save-temps is a debugging feature, we report the error
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// directly and exit.
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if (EC)
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reportOpenError(Path, EC.message());
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WriteIndexToFile(Index, OS);
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Path = OutputFileName + "index.dot";
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raw_fd_ostream OSDot(Path, EC, sys::fs::OpenFlags::F_None);
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if (EC)
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reportOpenError(Path, EC.message());
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Index.exportToDot(OSDot);
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return true;
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};
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return Error::success();
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}
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namespace {
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std::unique_ptr<TargetMachine>
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createTargetMachine(Config &Conf, const Target *TheTarget, Module &M) {
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StringRef TheTriple = M.getTargetTriple();
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SubtargetFeatures Features;
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Features.getDefaultSubtargetFeatures(Triple(TheTriple));
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for (const std::string &A : Conf.MAttrs)
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Features.AddFeature(A);
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Reloc::Model RelocModel;
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if (Conf.RelocModel)
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RelocModel = *Conf.RelocModel;
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else
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RelocModel =
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M.getPICLevel() == PICLevel::NotPIC ? Reloc::Static : Reloc::PIC_;
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Optional<CodeModel::Model> CodeModel;
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if (Conf.CodeModel)
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CodeModel = *Conf.CodeModel;
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else
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CodeModel = M.getCodeModel();
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return std::unique_ptr<TargetMachine>(TheTarget->createTargetMachine(
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TheTriple, Conf.CPU, Features.getString(), Conf.Options, RelocModel,
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CodeModel, Conf.CGOptLevel));
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}
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static void runNewPMPasses(Config &Conf, Module &Mod, TargetMachine *TM,
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unsigned OptLevel, bool IsThinLTO,
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ModuleSummaryIndex *ExportSummary,
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const ModuleSummaryIndex *ImportSummary) {
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Optional<PGOOptions> PGOOpt;
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if (!Conf.SampleProfile.empty())
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PGOOpt = PGOOptions("", "", Conf.SampleProfile, Conf.ProfileRemapping,
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false, true);
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PassBuilder PB(TM, PGOOpt);
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AAManager AA;
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// Parse a custom AA pipeline if asked to.
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if (auto Err = PB.parseAAPipeline(AA, "default"))
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report_fatal_error("Error parsing default AA pipeline");
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LoopAnalysisManager LAM(Conf.DebugPassManager);
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FunctionAnalysisManager FAM(Conf.DebugPassManager);
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CGSCCAnalysisManager CGAM(Conf.DebugPassManager);
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ModuleAnalysisManager MAM(Conf.DebugPassManager);
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// Register the AA manager first so that our version is the one used.
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FAM.registerPass([&] { return std::move(AA); });
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// Register all the basic analyses with the managers.
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PB.registerModuleAnalyses(MAM);
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PB.registerCGSCCAnalyses(CGAM);
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PB.registerFunctionAnalyses(FAM);
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PB.registerLoopAnalyses(LAM);
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PB.crossRegisterProxies(LAM, FAM, CGAM, MAM);
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ModulePassManager MPM(Conf.DebugPassManager);
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// FIXME (davide): verify the input.
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PassBuilder::OptimizationLevel OL;
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switch (OptLevel) {
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default:
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llvm_unreachable("Invalid optimization level");
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case 0:
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OL = PassBuilder::O0;
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break;
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case 1:
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OL = PassBuilder::O1;
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break;
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case 2:
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OL = PassBuilder::O2;
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break;
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case 3:
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OL = PassBuilder::O3;
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break;
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}
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if (IsThinLTO)
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MPM = PB.buildThinLTODefaultPipeline(OL, Conf.DebugPassManager,
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ImportSummary);
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else
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MPM = PB.buildLTODefaultPipeline(OL, Conf.DebugPassManager, ExportSummary);
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MPM.run(Mod, MAM);
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// FIXME (davide): verify the output.
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}
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static void runNewPMCustomPasses(Module &Mod, TargetMachine *TM,
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std::string PipelineDesc,
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std::string AAPipelineDesc,
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bool DisableVerify) {
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PassBuilder PB(TM);
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AAManager AA;
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// Parse a custom AA pipeline if asked to.
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if (!AAPipelineDesc.empty())
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if (auto Err = PB.parseAAPipeline(AA, AAPipelineDesc))
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report_fatal_error("unable to parse AA pipeline description '" +
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AAPipelineDesc + "': " + toString(std::move(Err)));
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LoopAnalysisManager LAM;
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FunctionAnalysisManager FAM;
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CGSCCAnalysisManager CGAM;
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ModuleAnalysisManager MAM;
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// Register the AA manager first so that our version is the one used.
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FAM.registerPass([&] { return std::move(AA); });
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// Register all the basic analyses with the managers.
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PB.registerModuleAnalyses(MAM);
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PB.registerCGSCCAnalyses(CGAM);
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PB.registerFunctionAnalyses(FAM);
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PB.registerLoopAnalyses(LAM);
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PB.crossRegisterProxies(LAM, FAM, CGAM, MAM);
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ModulePassManager MPM;
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// Always verify the input.
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MPM.addPass(VerifierPass());
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// Now, add all the passes we've been requested to.
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if (auto Err = PB.parsePassPipeline(MPM, PipelineDesc))
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report_fatal_error("unable to parse pass pipeline description '" +
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PipelineDesc + "': " + toString(std::move(Err)));
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if (!DisableVerify)
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MPM.addPass(VerifierPass());
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MPM.run(Mod, MAM);
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}
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static void runOldPMPasses(Config &Conf, Module &Mod, TargetMachine *TM,
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bool IsThinLTO, ModuleSummaryIndex *ExportSummary,
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const ModuleSummaryIndex *ImportSummary) {
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legacy::PassManager passes;
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passes.add(createTargetTransformInfoWrapperPass(TM->getTargetIRAnalysis()));
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PassManagerBuilder PMB;
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PMB.LibraryInfo = new TargetLibraryInfoImpl(Triple(TM->getTargetTriple()));
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PMB.Inliner = createFunctionInliningPass();
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PMB.ExportSummary = ExportSummary;
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PMB.ImportSummary = ImportSummary;
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// Unconditionally verify input since it is not verified before this
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// point and has unknown origin.
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PMB.VerifyInput = true;
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PMB.VerifyOutput = !Conf.DisableVerify;
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PMB.LoopVectorize = true;
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PMB.SLPVectorize = true;
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PMB.OptLevel = Conf.OptLevel;
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PMB.PGOSampleUse = Conf.SampleProfile;
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if (IsThinLTO)
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PMB.populateThinLTOPassManager(passes);
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else
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PMB.populateLTOPassManager(passes);
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passes.run(Mod);
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}
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bool opt(Config &Conf, TargetMachine *TM, unsigned Task, Module &Mod,
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bool IsThinLTO, ModuleSummaryIndex *ExportSummary,
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const ModuleSummaryIndex *ImportSummary) {
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// FIXME: Plumb the combined index into the new pass manager.
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if (!Conf.OptPipeline.empty())
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runNewPMCustomPasses(Mod, TM, Conf.OptPipeline, Conf.AAPipeline,
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Conf.DisableVerify);
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else if (Conf.UseNewPM)
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runNewPMPasses(Conf, Mod, TM, Conf.OptLevel, IsThinLTO, ExportSummary,
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ImportSummary);
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else
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runOldPMPasses(Conf, Mod, TM, IsThinLTO, ExportSummary, ImportSummary);
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return !Conf.PostOptModuleHook || Conf.PostOptModuleHook(Task, Mod);
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}
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void codegen(Config &Conf, TargetMachine *TM, AddStreamFn AddStream,
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unsigned Task, Module &Mod) {
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if (Conf.PreCodeGenModuleHook && !Conf.PreCodeGenModuleHook(Task, Mod))
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return;
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std::unique_ptr<ToolOutputFile> DwoOut;
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SmallString<1024> DwoFile(Conf.DwoPath);
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if (!Conf.DwoDir.empty()) {
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std::error_code EC;
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if (auto EC = llvm::sys::fs::create_directories(Conf.DwoDir))
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report_fatal_error("Failed to create directory " + Conf.DwoDir + ": " +
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EC.message());
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DwoFile = Conf.DwoDir;
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sys::path::append(DwoFile, std::to_string(Task) + ".dwo");
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}
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if (!DwoFile.empty()) {
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std::error_code EC;
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TM->Options.MCOptions.SplitDwarfFile = DwoFile.str().str();
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DwoOut = llvm::make_unique<ToolOutputFile>(DwoFile, EC, sys::fs::F_None);
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if (EC)
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report_fatal_error("Failed to open " + DwoFile + ": " + EC.message());
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}
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auto Stream = AddStream(Task);
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legacy::PassManager CodeGenPasses;
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if (TM->addPassesToEmitFile(CodeGenPasses, *Stream->OS,
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DwoOut ? &DwoOut->os() : nullptr,
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Conf.CGFileType))
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report_fatal_error("Failed to setup codegen");
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CodeGenPasses.run(Mod);
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if (DwoOut)
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DwoOut->keep();
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}
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void splitCodeGen(Config &C, TargetMachine *TM, AddStreamFn AddStream,
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unsigned ParallelCodeGenParallelismLevel,
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std::unique_ptr<Module> Mod) {
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ThreadPool CodegenThreadPool(ParallelCodeGenParallelismLevel);
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unsigned ThreadCount = 0;
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const Target *T = &TM->getTarget();
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SplitModule(
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std::move(Mod), ParallelCodeGenParallelismLevel,
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[&](std::unique_ptr<Module> MPart) {
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// We want to clone the module in a new context to multi-thread the
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// codegen. We do it by serializing partition modules to bitcode
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// (while still on the main thread, in order to avoid data races) and
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// spinning up new threads which deserialize the partitions into
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// separate contexts.
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// FIXME: Provide a more direct way to do this in LLVM.
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SmallString<0> BC;
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raw_svector_ostream BCOS(BC);
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WriteBitcodeToFile(*MPart, BCOS);
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// Enqueue the task
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CodegenThreadPool.async(
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[&](const SmallString<0> &BC, unsigned ThreadId) {
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LTOLLVMContext Ctx(C);
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Expected<std::unique_ptr<Module>> MOrErr = parseBitcodeFile(
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MemoryBufferRef(StringRef(BC.data(), BC.size()), "ld-temp.o"),
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Ctx);
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if (!MOrErr)
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report_fatal_error("Failed to read bitcode");
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std::unique_ptr<Module> MPartInCtx = std::move(MOrErr.get());
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std::unique_ptr<TargetMachine> TM =
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createTargetMachine(C, T, *MPartInCtx);
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codegen(C, TM.get(), AddStream, ThreadId, *MPartInCtx);
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},
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// Pass BC using std::move to ensure that it get moved rather than
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// copied into the thread's context.
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std::move(BC), ThreadCount++);
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},
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false);
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// Because the inner lambda (which runs in a worker thread) captures our local
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// variables, we need to wait for the worker threads to terminate before we
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// can leave the function scope.
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CodegenThreadPool.wait();
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}
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Expected<const Target *> initAndLookupTarget(Config &C, Module &Mod) {
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if (!C.OverrideTriple.empty())
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Mod.setTargetTriple(C.OverrideTriple);
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else if (Mod.getTargetTriple().empty())
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Mod.setTargetTriple(C.DefaultTriple);
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std::string Msg;
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const Target *T = TargetRegistry::lookupTarget(Mod.getTargetTriple(), Msg);
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if (!T)
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return make_error<StringError>(Msg, inconvertibleErrorCode());
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return T;
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}
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}
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static Error
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finalizeOptimizationRemarks(std::unique_ptr<ToolOutputFile> DiagOutputFile) {
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// Make sure we flush the diagnostic remarks file in case the linker doesn't
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// call the global destructors before exiting.
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if (!DiagOutputFile)
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return Error::success();
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DiagOutputFile->keep();
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DiagOutputFile->os().flush();
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return Error::success();
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}
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Error lto::backend(Config &C, AddStreamFn AddStream,
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unsigned ParallelCodeGenParallelismLevel,
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std::unique_ptr<Module> Mod,
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ModuleSummaryIndex &CombinedIndex) {
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Expected<const Target *> TOrErr = initAndLookupTarget(C, *Mod);
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if (!TOrErr)
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return TOrErr.takeError();
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std::unique_ptr<TargetMachine> TM = createTargetMachine(C, *TOrErr, *Mod);
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// Setup optimization remarks.
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auto DiagFileOrErr = lto::setupOptimizationRemarks(
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Mod->getContext(), C.RemarksFilename, C.RemarksWithHotness);
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if (!DiagFileOrErr)
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return DiagFileOrErr.takeError();
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auto DiagnosticOutputFile = std::move(*DiagFileOrErr);
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if (!C.CodeGenOnly) {
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if (!opt(C, TM.get(), 0, *Mod, /*IsThinLTO=*/false,
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/*ExportSummary=*/&CombinedIndex, /*ImportSummary=*/nullptr))
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return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
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}
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if (ParallelCodeGenParallelismLevel == 1) {
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codegen(C, TM.get(), AddStream, 0, *Mod);
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} else {
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splitCodeGen(C, TM.get(), AddStream, ParallelCodeGenParallelismLevel,
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std::move(Mod));
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}
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return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
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}
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static void dropDeadSymbols(Module &Mod, const GVSummaryMapTy &DefinedGlobals,
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const ModuleSummaryIndex &Index) {
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std::vector<GlobalValue*> DeadGVs;
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for (auto &GV : Mod.global_values())
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if (GlobalValueSummary *GVS = DefinedGlobals.lookup(GV.getGUID()))
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if (!Index.isGlobalValueLive(GVS)) {
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DeadGVs.push_back(&GV);
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convertToDeclaration(GV);
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}
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// Now that all dead bodies have been dropped, delete the actual objects
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// themselves when possible.
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for (GlobalValue *GV : DeadGVs) {
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GV->removeDeadConstantUsers();
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// Might reference something defined in native object (i.e. dropped a
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// non-prevailing IR def, but we need to keep the declaration).
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if (GV->use_empty())
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GV->eraseFromParent();
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}
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}
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Error lto::thinBackend(Config &Conf, unsigned Task, AddStreamFn AddStream,
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Module &Mod, const ModuleSummaryIndex &CombinedIndex,
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const FunctionImporter::ImportMapTy &ImportList,
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const GVSummaryMapTy &DefinedGlobals,
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MapVector<StringRef, BitcodeModule> &ModuleMap) {
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Expected<const Target *> TOrErr = initAndLookupTarget(Conf, Mod);
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if (!TOrErr)
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return TOrErr.takeError();
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std::unique_ptr<TargetMachine> TM = createTargetMachine(Conf, *TOrErr, Mod);
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// Setup optimization remarks.
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auto DiagFileOrErr = lto::setupOptimizationRemarks(
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Mod.getContext(), Conf.RemarksFilename, Conf.RemarksWithHotness, Task);
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if (!DiagFileOrErr)
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return DiagFileOrErr.takeError();
|
|
auto DiagnosticOutputFile = std::move(*DiagFileOrErr);
|
|
|
|
if (Conf.CodeGenOnly) {
|
|
codegen(Conf, TM.get(), AddStream, Task, Mod);
|
|
return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
|
|
}
|
|
|
|
if (Conf.PreOptModuleHook && !Conf.PreOptModuleHook(Task, Mod))
|
|
return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
|
|
|
|
renameModuleForThinLTO(Mod, CombinedIndex);
|
|
|
|
dropDeadSymbols(Mod, DefinedGlobals, CombinedIndex);
|
|
|
|
thinLTOResolvePrevailingInModule(Mod, DefinedGlobals);
|
|
|
|
if (Conf.PostPromoteModuleHook && !Conf.PostPromoteModuleHook(Task, Mod))
|
|
return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
|
|
|
|
if (!DefinedGlobals.empty())
|
|
thinLTOInternalizeModule(Mod, DefinedGlobals);
|
|
|
|
if (Conf.PostInternalizeModuleHook &&
|
|
!Conf.PostInternalizeModuleHook(Task, Mod))
|
|
return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
|
|
|
|
auto ModuleLoader = [&](StringRef Identifier) {
|
|
assert(Mod.getContext().isODRUniquingDebugTypes() &&
|
|
"ODR Type uniquing should be enabled on the context");
|
|
auto I = ModuleMap.find(Identifier);
|
|
assert(I != ModuleMap.end());
|
|
return I->second.getLazyModule(Mod.getContext(),
|
|
/*ShouldLazyLoadMetadata=*/true,
|
|
/*IsImporting*/ true);
|
|
};
|
|
|
|
FunctionImporter Importer(CombinedIndex, ModuleLoader);
|
|
if (Error Err = Importer.importFunctions(Mod, ImportList).takeError())
|
|
return Err;
|
|
|
|
if (Conf.PostImportModuleHook && !Conf.PostImportModuleHook(Task, Mod))
|
|
return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
|
|
|
|
if (!opt(Conf, TM.get(), Task, Mod, /*IsThinLTO=*/true,
|
|
/*ExportSummary=*/nullptr, /*ImportSummary=*/&CombinedIndex))
|
|
return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
|
|
|
|
codegen(Conf, TM.get(), AddStream, Task, Mod);
|
|
return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
|
|
}
|