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-rw-r--r--ELF/LTO.cpp327
1 files changed, 167 insertions, 160 deletions
diff --git a/ELF/LTO.cpp b/ELF/LTO.cpp
index ca44581780e47..28d4bfe77c5d4 100644
--- a/ELF/LTO.cpp
+++ b/ELF/LTO.cpp
@@ -1,9 +1,8 @@
//===- LTO.cpp ------------------------------------------------------------===//
//
-// The LLVM Linker
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
@@ -13,6 +12,7 @@
#include "LinkerScript.h"
#include "SymbolTable.h"
#include "Symbols.h"
+#include "lld/Common/Args.h"
#include "lld/Common/ErrorHandler.h"
#include "lld/Common/TargetOptionsCommandFlags.h"
#include "llvm/ADT/STLExtras.h"
@@ -47,134 +47,135 @@ using namespace lld::elf;
// Creates an empty file to store a list of object files for final
// linking of distributed ThinLTO.
-static std::unique_ptr<raw_fd_ostream> openFile(StringRef File) {
- std::error_code EC;
- auto Ret =
- llvm::make_unique<raw_fd_ostream>(File, EC, sys::fs::OpenFlags::F_None);
- if (EC) {
- error("cannot open " + File + ": " + EC.message());
+static std::unique_ptr<raw_fd_ostream> openFile(StringRef file) {
+ std::error_code ec;
+ auto ret =
+ llvm::make_unique<raw_fd_ostream>(file, ec, sys::fs::OpenFlags::F_None);
+ if (ec) {
+ error("cannot open " + file + ": " + ec.message());
return nullptr;
}
- return Ret;
+ return ret;
}
-static std::string getThinLTOOutputFile(StringRef ModulePath) {
- return lto::getThinLTOOutputFile(ModulePath,
- Config->ThinLTOPrefixReplace.first,
- Config->ThinLTOPrefixReplace.second);
+static std::string getThinLTOOutputFile(StringRef modulePath) {
+ return lto::getThinLTOOutputFile(modulePath,
+ config->thinLTOPrefixReplace.first,
+ config->thinLTOPrefixReplace.second);
}
static lto::Config createConfig() {
- lto::Config C;
+ lto::Config c;
// LLD supports the new relocations and address-significance tables.
- C.Options = InitTargetOptionsFromCodeGenFlags();
- C.Options.RelaxELFRelocations = true;
- C.Options.EmitAddrsig = true;
+ c.Options = initTargetOptionsFromCodeGenFlags();
+ c.Options.RelaxELFRelocations = true;
+ c.Options.EmitAddrsig = true;
// Always emit a section per function/datum with LTO.
- C.Options.FunctionSections = true;
- C.Options.DataSections = true;
+ c.Options.FunctionSections = true;
+ c.Options.DataSections = true;
- if (Config->Relocatable)
- C.RelocModel = None;
- else if (Config->Pic)
- C.RelocModel = Reloc::PIC_;
+ if (config->relocatable)
+ c.RelocModel = None;
+ else if (config->isPic)
+ c.RelocModel = Reloc::PIC_;
else
- C.RelocModel = Reloc::Static;
+ c.RelocModel = Reloc::Static;
- C.CodeModel = GetCodeModelFromCMModel();
- C.DisableVerify = Config->DisableVerify;
- C.DiagHandler = diagnosticHandler;
- C.OptLevel = Config->LTOO;
- C.CPU = GetCPUStr();
- C.MAttrs = GetMAttrs();
+ c.CodeModel = getCodeModelFromCMModel();
+ c.DisableVerify = config->disableVerify;
+ c.DiagHandler = diagnosticHandler;
+ c.OptLevel = config->ltoo;
+ c.CPU = getCPUStr();
+ c.MAttrs = getMAttrs();
+ c.CGOptLevel = args::getCGOptLevel(config->ltoo);
// Set up a custom pipeline if we've been asked to.
- C.OptPipeline = Config->LTONewPmPasses;
- C.AAPipeline = Config->LTOAAPipeline;
+ c.OptPipeline = config->ltoNewPmPasses;
+ c.AAPipeline = config->ltoAAPipeline;
// Set up optimization remarks if we've been asked to.
- C.RemarksFilename = Config->OptRemarksFilename;
- C.RemarksWithHotness = Config->OptRemarksWithHotness;
-
- C.SampleProfile = Config->LTOSampleProfile;
- C.UseNewPM = Config->LTONewPassManager;
- C.DebugPassManager = Config->LTODebugPassManager;
- C.DwoDir = Config->DwoDir;
-
- if (Config->EmitLLVM) {
- C.PostInternalizeModuleHook = [](size_t Task, const Module &M) {
- if (std::unique_ptr<raw_fd_ostream> OS = openFile(Config->OutputFile))
- WriteBitcodeToFile(M, *OS, false);
+ c.RemarksFilename = config->optRemarksFilename;
+ c.RemarksPasses = config->optRemarksPasses;
+ c.RemarksWithHotness = config->optRemarksWithHotness;
+ c.RemarksFormat = config->optRemarksFormat;
+
+ c.SampleProfile = config->ltoSampleProfile;
+ c.UseNewPM = config->ltoNewPassManager;
+ c.DebugPassManager = config->ltoDebugPassManager;
+ c.DwoDir = config->dwoDir;
+
+ c.CSIRProfile = config->ltoCSProfileFile;
+ c.RunCSIRInstr = config->ltoCSProfileGenerate;
+
+ if (config->emitLLVM) {
+ c.PostInternalizeModuleHook = [](size_t task, const Module &m) {
+ if (std::unique_ptr<raw_fd_ostream> os = openFile(config->outputFile))
+ WriteBitcodeToFile(m, *os, false);
return false;
};
}
- if (Config->SaveTemps)
- checkError(C.addSaveTemps(Config->OutputFile.str() + ".",
+ if (config->saveTemps)
+ checkError(c.addSaveTemps(config->outputFile.str() + ".",
/*UseInputModulePath*/ true));
- return C;
+ return c;
}
BitcodeCompiler::BitcodeCompiler() {
- // Initialize IndexFile.
- if (!Config->ThinLTOIndexOnlyArg.empty())
- IndexFile = openFile(Config->ThinLTOIndexOnlyArg);
-
- // Initialize LTOObj.
- lto::ThinBackend Backend;
- if (Config->ThinLTOIndexOnly) {
- auto OnIndexWrite = [&](StringRef S) { ThinIndices.erase(S); };
- Backend = lto::createWriteIndexesThinBackend(
- Config->ThinLTOPrefixReplace.first, Config->ThinLTOPrefixReplace.second,
- Config->ThinLTOEmitImportsFiles, IndexFile.get(), OnIndexWrite);
- } else if (Config->ThinLTOJobs != -1U) {
- Backend = lto::createInProcessThinBackend(Config->ThinLTOJobs);
+ // Initialize indexFile.
+ if (!config->thinLTOIndexOnlyArg.empty())
+ indexFile = openFile(config->thinLTOIndexOnlyArg);
+
+ // Initialize ltoObj.
+ lto::ThinBackend backend;
+ if (config->thinLTOIndexOnly) {
+ auto onIndexWrite = [&](StringRef s) { thinIndices.erase(s); };
+ backend = lto::createWriteIndexesThinBackend(
+ config->thinLTOPrefixReplace.first, config->thinLTOPrefixReplace.second,
+ config->thinLTOEmitImportsFiles, indexFile.get(), onIndexWrite);
+ } else if (config->thinLTOJobs != -1U) {
+ backend = lto::createInProcessThinBackend(config->thinLTOJobs);
}
- LTOObj = llvm::make_unique<lto::LTO>(createConfig(), Backend,
- Config->LTOPartitions);
+ ltoObj = llvm::make_unique<lto::LTO>(createConfig(), backend,
+ config->ltoPartitions);
- // Initialize UsedStartStop.
- for (Symbol *Sym : Symtab->getSymbols()) {
- StringRef S = Sym->getName();
- for (StringRef Prefix : {"__start_", "__stop_"})
- if (S.startswith(Prefix))
- UsedStartStop.insert(S.substr(Prefix.size()));
- }
+ // Initialize usedStartStop.
+ symtab->forEachSymbol([&](Symbol *sym) {
+ StringRef s = sym->getName();
+ for (StringRef prefix : {"__start_", "__stop_"})
+ if (s.startswith(prefix))
+ usedStartStop.insert(s.substr(prefix.size()));
+ });
}
BitcodeCompiler::~BitcodeCompiler() = default;
-static void undefine(Symbol *S) {
- replaceSymbol<Undefined>(S, nullptr, S->getName(), STB_GLOBAL, STV_DEFAULT,
- S->Type);
-}
-
-void BitcodeCompiler::add(BitcodeFile &F) {
- lto::InputFile &Obj = *F.Obj;
- bool IsExec = !Config->Shared && !Config->Relocatable;
+void BitcodeCompiler::add(BitcodeFile &f) {
+ lto::InputFile &obj = *f.obj;
+ bool isExec = !config->shared && !config->relocatable;
- if (Config->ThinLTOIndexOnly)
- ThinIndices.insert(Obj.getName());
+ if (config->thinLTOIndexOnly)
+ thinIndices.insert(obj.getName());
- ArrayRef<Symbol *> Syms = F.getSymbols();
- ArrayRef<lto::InputFile::Symbol> ObjSyms = Obj.symbols();
- std::vector<lto::SymbolResolution> Resols(Syms.size());
+ ArrayRef<Symbol *> syms = f.getSymbols();
+ ArrayRef<lto::InputFile::Symbol> objSyms = obj.symbols();
+ std::vector<lto::SymbolResolution> resols(syms.size());
// Provide a resolution to the LTO API for each symbol.
- for (size_t I = 0, E = Syms.size(); I != E; ++I) {
- Symbol *Sym = Syms[I];
- const lto::InputFile::Symbol &ObjSym = ObjSyms[I];
- lto::SymbolResolution &R = Resols[I];
+ for (size_t i = 0, e = syms.size(); i != e; ++i) {
+ Symbol *sym = syms[i];
+ const lto::InputFile::Symbol &objSym = objSyms[i];
+ lto::SymbolResolution &r = resols[i];
// Ideally we shouldn't check for SF_Undefined but currently IRObjectFile
// reports two symbols for module ASM defined. Without this check, lld
// flags an undefined in IR with a definition in ASM as prevailing.
// Once IRObjectFile is fixed to report only one symbol this hack can
// be removed.
- R.Prevailing = !ObjSym.isUndefined() && Sym->File == &F;
+ r.Prevailing = !objSym.isUndefined() && sym->file == &f;
// We ask LTO to preserve following global symbols:
// 1) All symbols when doing relocatable link, so that them can be used
@@ -182,115 +183,121 @@ void BitcodeCompiler::add(BitcodeFile &F) {
// 2) Symbols that are used in regular objects.
// 3) C named sections if we have corresponding __start_/__stop_ symbol.
// 4) Symbols that are defined in bitcode files and used for dynamic linking.
- R.VisibleToRegularObj = Config->Relocatable || Sym->IsUsedInRegularObj ||
- (R.Prevailing && Sym->includeInDynsym()) ||
- UsedStartStop.count(ObjSym.getSectionName());
- const auto *DR = dyn_cast<Defined>(Sym);
- R.FinalDefinitionInLinkageUnit =
- (IsExec || Sym->Visibility != STV_DEFAULT) && DR &&
+ r.VisibleToRegularObj = config->relocatable || sym->isUsedInRegularObj ||
+ (r.Prevailing && sym->includeInDynsym()) ||
+ usedStartStop.count(objSym.getSectionName());
+ const auto *dr = dyn_cast<Defined>(sym);
+ r.FinalDefinitionInLinkageUnit =
+ (isExec || sym->visibility != STV_DEFAULT) && dr &&
// Skip absolute symbols from ELF objects, otherwise PC-rel relocations
// will be generated by for them, triggering linker errors.
// Symbol section is always null for bitcode symbols, hence the check
// for isElf(). Skip linker script defined symbols as well: they have
// no File defined.
- !(DR->Section == nullptr && (!Sym->File || Sym->File->isElf()));
+ !(dr->section == nullptr && (!sym->file || sym->file->isElf()));
- if (R.Prevailing)
- undefine(Sym);
+ if (r.Prevailing)
+ sym->replace(Undefined{nullptr, sym->getName(), STB_GLOBAL, STV_DEFAULT,
+ sym->type});
// We tell LTO to not apply interprocedural optimization for wrapped
// (with --wrap) symbols because otherwise LTO would inline them while
// their values are still not final.
- R.LinkerRedefined = !Sym->CanInline;
+ r.LinkerRedefined = !sym->canInline;
}
- checkError(LTOObj->add(std::move(F.Obj), Resols));
+ checkError(ltoObj->add(std::move(f.obj), resols));
}
-static void createEmptyIndex(StringRef ModulePath) {
- std::string Path = replaceThinLTOSuffix(getThinLTOOutputFile(ModulePath));
- std::unique_ptr<raw_fd_ostream> OS = openFile(Path + ".thinlto.bc");
- if (!OS)
- return;
-
- ModuleSummaryIndex M(/*HaveGVs*/ false);
- M.setSkipModuleByDistributedBackend();
- WriteIndexToFile(M, *OS);
+// If LazyObjFile has not been added to link, emit empty index files.
+// This is needed because this is what GNU gold plugin does and we have a
+// distributed build system that depends on that behavior.
+static void thinLTOCreateEmptyIndexFiles() {
+ for (LazyObjFile *f : lazyObjFiles) {
+ if (!isBitcode(f->mb))
+ continue;
+ std::string path = replaceThinLTOSuffix(getThinLTOOutputFile(f->getName()));
+ std::unique_ptr<raw_fd_ostream> os = openFile(path + ".thinlto.bc");
+ if (!os)
+ continue;
- if (Config->ThinLTOEmitImportsFiles)
- openFile(Path + ".imports");
+ ModuleSummaryIndex m(/*HaveGVs*/ false);
+ m.setSkipModuleByDistributedBackend();
+ WriteIndexToFile(m, *os);
+ if (config->thinLTOEmitImportsFiles)
+ openFile(path + ".imports");
+ }
}
// Merge all the bitcode files we have seen, codegen the result
// and return the resulting ObjectFile(s).
std::vector<InputFile *> BitcodeCompiler::compile() {
- unsigned MaxTasks = LTOObj->getMaxTasks();
- Buf.resize(MaxTasks);
- Files.resize(MaxTasks);
+ unsigned maxTasks = ltoObj->getMaxTasks();
+ buf.resize(maxTasks);
+ files.resize(maxTasks);
// The --thinlto-cache-dir option specifies the path to a directory in which
// to cache native object files for ThinLTO incremental builds. If a path was
// specified, configure LTO to use it as the cache directory.
- lto::NativeObjectCache Cache;
- if (!Config->ThinLTOCacheDir.empty())
- Cache = check(
- lto::localCache(Config->ThinLTOCacheDir,
- [&](size_t Task, std::unique_ptr<MemoryBuffer> MB) {
- Files[Task] = std::move(MB);
+ lto::NativeObjectCache cache;
+ if (!config->thinLTOCacheDir.empty())
+ cache = check(
+ lto::localCache(config->thinLTOCacheDir,
+ [&](size_t task, std::unique_ptr<MemoryBuffer> mb) {
+ files[task] = std::move(mb);
}));
- checkError(LTOObj->run(
- [&](size_t Task) {
- return llvm::make_unique<lto::NativeObjectStream>(
- llvm::make_unique<raw_svector_ostream>(Buf[Task]));
- },
- Cache));
+ if (!bitcodeFiles.empty())
+ checkError(ltoObj->run(
+ [&](size_t task) {
+ return llvm::make_unique<lto::NativeObjectStream>(
+ llvm::make_unique<raw_svector_ostream>(buf[task]));
+ },
+ cache));
// Emit empty index files for non-indexed files
- for (StringRef S : ThinIndices) {
- std::string Path = getThinLTOOutputFile(S);
- openFile(Path + ".thinlto.bc");
- if (Config->ThinLTOEmitImportsFiles)
- openFile(Path + ".imports");
+ for (StringRef s : thinIndices) {
+ std::string path = getThinLTOOutputFile(s);
+ openFile(path + ".thinlto.bc");
+ if (config->thinLTOEmitImportsFiles)
+ openFile(path + ".imports");
}
- // If LazyObjFile has not been added to link, emit empty index files.
- // This is needed because this is what GNU gold plugin does and we have a
- // distributed build system that depends on that behavior.
- if (Config->ThinLTOIndexOnly) {
- for (LazyObjFile *F : LazyObjFiles)
- if (!F->AddedToLink && isBitcode(F->MB))
- createEmptyIndex(F->getName());
+ if (config->thinLTOIndexOnly) {
+ thinLTOCreateEmptyIndexFiles();
- if (!Config->LTOObjPath.empty())
- saveBuffer(Buf[0], Config->LTOObjPath);
+ if (!config->ltoObjPath.empty())
+ saveBuffer(buf[0], config->ltoObjPath);
// ThinLTO with index only option is required to generate only the index
// files. After that, we exit from linker and ThinLTO backend runs in a
// distributed environment.
- if (IndexFile)
- IndexFile->close();
+ if (indexFile)
+ indexFile->close();
return {};
}
- if (!Config->ThinLTOCacheDir.empty())
- pruneCache(Config->ThinLTOCacheDir, Config->ThinLTOCachePolicy);
+ if (!config->thinLTOCacheDir.empty())
+ pruneCache(config->thinLTOCacheDir, config->thinLTOCachePolicy);
- std::vector<InputFile *> Ret;
- for (unsigned I = 0; I != MaxTasks; ++I) {
- if (Buf[I].empty())
- continue;
- if (Config->SaveTemps) {
- if (I == 0)
- saveBuffer(Buf[I], Config->OutputFile + ".lto.o");
- else
- saveBuffer(Buf[I], Config->OutputFile + Twine(I) + ".lto.o");
- }
- InputFile *Obj = createObjectFile(MemoryBufferRef(Buf[I], "lto.tmp"));
- Ret.push_back(Obj);
+ if (!config->ltoObjPath.empty()) {
+ saveBuffer(buf[0], config->ltoObjPath);
+ for (unsigned i = 1; i != maxTasks; ++i)
+ saveBuffer(buf[i], config->ltoObjPath + Twine(i));
}
- for (std::unique_ptr<MemoryBuffer> &File : Files)
- if (File)
- Ret.push_back(createObjectFile(*File));
- return Ret;
+ if (config->saveTemps) {
+ saveBuffer(buf[0], config->outputFile + ".lto.o");
+ for (unsigned i = 1; i != maxTasks; ++i)
+ saveBuffer(buf[i], config->outputFile + Twine(i) + ".lto.o");
+ }
+
+ std::vector<InputFile *> ret;
+ for (unsigned i = 0; i != maxTasks; ++i)
+ if (!buf[i].empty())
+ ret.push_back(createObjectFile(MemoryBufferRef(buf[i], "lto.tmp")));
+
+ for (std::unique_ptr<MemoryBuffer> &file : files)
+ if (file)
+ ret.push_back(createObjectFile(*file));
+ return ret;
}
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