diff options
Diffstat (limited to 'wasm/LTO.cpp')
| -rw-r--r-- | wasm/LTO.cpp | 162 |
1 files changed, 0 insertions, 162 deletions
diff --git a/wasm/LTO.cpp b/wasm/LTO.cpp deleted file mode 100644 index 96a947e29d41..000000000000 --- a/wasm/LTO.cpp +++ /dev/null @@ -1,162 +0,0 @@ -//===- LTO.cpp ------------------------------------------------------------===// -// -// The LLVM Linker -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// - -#include "LTO.h" -#include "Config.h" -#include "InputFiles.h" -#include "Symbols.h" -#include "lld/Common/ErrorHandler.h" -#include "lld/Common/Strings.h" -#include "lld/Common/TargetOptionsCommandFlags.h" -#include "llvm/ADT/STLExtras.h" -#include "llvm/ADT/SmallString.h" -#include "llvm/ADT/StringRef.h" -#include "llvm/ADT/Twine.h" -#include "llvm/IR/DiagnosticPrinter.h" -#include "llvm/LTO/Caching.h" -#include "llvm/LTO/Config.h" -#include "llvm/LTO/LTO.h" -#include "llvm/Object/SymbolicFile.h" -#include "llvm/Support/CodeGen.h" -#include "llvm/Support/Error.h" -#include "llvm/Support/FileSystem.h" -#include "llvm/Support/MemoryBuffer.h" -#include "llvm/Support/raw_ostream.h" -#include <algorithm> -#include <cstddef> -#include <memory> -#include <string> -#include <system_error> -#include <vector> - -using namespace llvm; -using namespace lld; -using namespace lld::wasm; - -static std::unique_ptr<lto::LTO> createLTO() { - lto::Config C; - C.Options = InitTargetOptionsFromCodeGenFlags(); - - // Always emit a section per function/data with LTO. - C.Options.FunctionSections = true; - C.Options.DataSections = true; - - // Wasm currently only supports ThreadModel::Single - C.Options.ThreadModel = ThreadModel::Single; - - C.DisableVerify = Config->DisableVerify; - C.DiagHandler = diagnosticHandler; - C.OptLevel = Config->LTOO; - C.MAttrs = GetMAttrs(); - - if (Config->Relocatable) - C.RelocModel = None; - else if (Config->Pic) - C.RelocModel = Reloc::PIC_; - else - C.RelocModel = Reloc::Static; - - if (Config->SaveTemps) - checkError(C.addSaveTemps(Config->OutputFile.str() + ".", - /*UseInputModulePath*/ true)); - - lto::ThinBackend Backend; - if (Config->ThinLTOJobs != -1U) - Backend = lto::createInProcessThinBackend(Config->ThinLTOJobs); - return llvm::make_unique<lto::LTO>(std::move(C), Backend, - Config->LTOPartitions); -} - -BitcodeCompiler::BitcodeCompiler() : LTOObj(createLTO()) {} - -BitcodeCompiler::~BitcodeCompiler() = default; - -static void undefine(Symbol *S) { - if (auto F = dyn_cast<DefinedFunction>(S)) - replaceSymbol<UndefinedFunction>(F, F->getName(), 0, F->getFile(), - F->Signature); - else if (isa<DefinedData>(S)) - replaceSymbol<UndefinedData>(S, S->getName(), 0, S->getFile()); - else - llvm_unreachable("unexpected symbol kind"); -} - -void BitcodeCompiler::add(BitcodeFile &F) { - lto::InputFile &Obj = *F.Obj; - unsigned SymNum = 0; - ArrayRef<Symbol *> Syms = F.getSymbols(); - std::vector<lto::SymbolResolution> Resols(Syms.size()); - - // Provide a resolution to the LTO API for each symbol. - for (const lto::InputFile::Symbol &ObjSym : Obj.symbols()) { - Symbol *Sym = Syms[SymNum]; - lto::SymbolResolution &R = Resols[SymNum]; - ++SymNum; - - // 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->getFile() == &F; - R.VisibleToRegularObj = Config->Relocatable || Sym->IsUsedInRegularObj || - (R.Prevailing && Sym->isExported()); - if (R.Prevailing) - undefine(Sym); - } - checkError(LTOObj->add(std::move(F.Obj), Resols)); -} - -// Merge all the bitcode files we have seen, codegen the result -// and return the resulting objects. -std::vector<StringRef> BitcodeCompiler::compile() { - 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); - })); - - checkError(LTOObj->run( - [&](size_t Task) { - return llvm::make_unique<lto::NativeObjectStream>( - llvm::make_unique<raw_svector_ostream>(Buf[Task])); - }, - Cache)); - - if (!Config->ThinLTOCacheDir.empty()) - pruneCache(Config->ThinLTOCacheDir, Config->ThinLTOCachePolicy); - - std::vector<StringRef> 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"); - } - Ret.emplace_back(Buf[I].data(), Buf[I].size()); - } - - for (std::unique_ptr<MemoryBuffer> &File : Files) - if (File) - Ret.push_back(File->getBuffer()); - - return Ret; -} |