1 //===-- gold-plugin.cpp - Plugin to gold for Link Time Optimization ------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This is a gold plugin for LLVM. It provides an LLVM implementation of the
11 // interface described in http://gcc.gnu.org/wiki/whopr/driver .
13 //===----------------------------------------------------------------------===//
15 #include "llvm/Config/config.h" // plugin-api.h requires HAVE_STDINT_H
16 #include "llvm/ADT/DenseSet.h"
17 #include "llvm/ADT/StringSet.h"
18 #include "llvm/Analysis/TargetLibraryInfo.h"
19 #include "llvm/Analysis/TargetTransformInfo.h"
20 #include "llvm/Bitcode/ReaderWriter.h"
21 #include "llvm/CodeGen/Analysis.h"
22 #include "llvm/CodeGen/CommandFlags.h"
23 #include "llvm/IR/AutoUpgrade.h"
24 #include "llvm/IR/Constants.h"
25 #include "llvm/IR/DiagnosticInfo.h"
26 #include "llvm/IR/DiagnosticPrinter.h"
27 #include "llvm/IR/LLVMContext.h"
28 #include "llvm/IR/LegacyPassManager.h"
29 #include "llvm/IR/Module.h"
30 #include "llvm/IR/Verifier.h"
31 #include "llvm/Linker/Linker.h"
32 #include "llvm/MC/SubtargetFeature.h"
33 #include "llvm/Object/IRObjectFile.h"
34 #include "llvm/Support/FormattedStream.h"
35 #include "llvm/Support/Host.h"
36 #include "llvm/Support/ManagedStatic.h"
37 #include "llvm/Support/MemoryBuffer.h"
38 #include "llvm/Support/TargetRegistry.h"
39 #include "llvm/Support/TargetSelect.h"
40 #include "llvm/Transforms/IPO.h"
41 #include "llvm/Transforms/IPO/PassManagerBuilder.h"
42 #include "llvm/Transforms/Utils/GlobalStatus.h"
43 #include "llvm/Transforms/Utils/ModuleUtils.h"
44 #include "llvm/Transforms/Utils/ValueMapper.h"
46 #include <plugin-api.h>
47 #include <system_error>
51 // FIXME: remove this declaration when we stop maintaining Ubuntu Quantal and
52 // Precise and Debian Wheezy (binutils 2.23 is required)
61 std::vector<ld_plugin_symbol> syms;
65 static ld_plugin_status discard_message(int level, const char *format, ...) {
66 // Die loudly. Recent versions of Gold pass ld_plugin_message as the first
67 // callback in the transfer vector. This should never be called.
71 static ld_plugin_get_input_file get_input_file = nullptr;
72 static ld_plugin_release_input_file release_input_file = nullptr;
73 static ld_plugin_add_symbols add_symbols = nullptr;
74 static ld_plugin_get_symbols get_symbols = nullptr;
75 static ld_plugin_add_input_file add_input_file = nullptr;
76 static ld_plugin_set_extra_library_path set_extra_library_path = nullptr;
77 static ld_plugin_get_view get_view = nullptr;
78 static ld_plugin_message message = discard_message;
79 static Reloc::Model RelocationModel = Reloc::Default;
80 static std::string output_name = "";
81 static std::list<claimed_file> Modules;
82 static std::vector<std::string> Cleanup;
83 static llvm::TargetOptions TargetOpts;
92 static bool generate_api_file = false;
93 static OutputType TheOutputType = OT_NORMAL;
94 static std::string obj_path;
95 static std::string extra_library_path;
96 static std::string triple;
97 static std::string mcpu;
98 // Additional options to pass into the code generator.
99 // Note: This array will contain all plugin options which are not claimed
100 // as plugin exclusive to pass to the code generator.
101 // For example, "generate-api-file" and "as"options are for the plugin
102 // use only and will not be passed.
103 static std::vector<const char *> extra;
105 static void process_plugin_option(const char* opt_)
109 llvm::StringRef opt = opt_;
111 if (opt == "generate-api-file") {
112 generate_api_file = true;
113 } else if (opt.startswith("mcpu=")) {
114 mcpu = opt.substr(strlen("mcpu="));
115 } else if (opt.startswith("extra-library-path=")) {
116 extra_library_path = opt.substr(strlen("extra_library_path="));
117 } else if (opt.startswith("mtriple=")) {
118 triple = opt.substr(strlen("mtriple="));
119 } else if (opt.startswith("obj-path=")) {
120 obj_path = opt.substr(strlen("obj-path="));
121 } else if (opt == "emit-llvm") {
122 TheOutputType = OT_BC_ONLY;
123 } else if (opt == "save-temps") {
124 TheOutputType = OT_SAVE_TEMPS;
125 } else if (opt == "disable-output") {
126 TheOutputType = OT_DISABLE;
128 // Save this option to pass to the code generator.
129 // ParseCommandLineOptions() expects argv[0] to be program name. Lazily
132 extra.push_back("LLVMgold");
134 extra.push_back(opt_);
139 static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
141 static ld_plugin_status all_symbols_read_hook(void);
142 static ld_plugin_status cleanup_hook(void);
144 extern "C" ld_plugin_status onload(ld_plugin_tv *tv);
145 ld_plugin_status onload(ld_plugin_tv *tv) {
146 InitializeAllTargetInfos();
147 InitializeAllTargets();
148 InitializeAllTargetMCs();
149 InitializeAllAsmParsers();
150 InitializeAllAsmPrinters();
152 // We're given a pointer to the first transfer vector. We read through them
153 // until we find one where tv_tag == LDPT_NULL. The REGISTER_* tagged values
154 // contain pointers to functions that we need to call to register our own
155 // hooks. The others are addresses of functions we can use to call into gold
158 bool registeredClaimFile = false;
159 bool RegisteredAllSymbolsRead = false;
161 for (; tv->tv_tag != LDPT_NULL; ++tv) {
162 switch (tv->tv_tag) {
163 case LDPT_OUTPUT_NAME:
164 output_name = tv->tv_u.tv_string;
166 case LDPT_LINKER_OUTPUT:
167 switch (tv->tv_u.tv_val) {
169 case LDPO_DYN: // .so
170 case LDPO_PIE: // position independent executable
171 RelocationModel = Reloc::PIC_;
173 case LDPO_EXEC: // .exe
174 RelocationModel = Reloc::Static;
177 message(LDPL_ERROR, "Unknown output file type %d", tv->tv_u.tv_val);
182 options::process_plugin_option(tv->tv_u.tv_string);
184 case LDPT_REGISTER_CLAIM_FILE_HOOK: {
185 ld_plugin_register_claim_file callback;
186 callback = tv->tv_u.tv_register_claim_file;
188 if (callback(claim_file_hook) != LDPS_OK)
191 registeredClaimFile = true;
193 case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: {
194 ld_plugin_register_all_symbols_read callback;
195 callback = tv->tv_u.tv_register_all_symbols_read;
197 if (callback(all_symbols_read_hook) != LDPS_OK)
200 RegisteredAllSymbolsRead = true;
202 case LDPT_REGISTER_CLEANUP_HOOK: {
203 ld_plugin_register_cleanup callback;
204 callback = tv->tv_u.tv_register_cleanup;
206 if (callback(cleanup_hook) != LDPS_OK)
209 case LDPT_GET_INPUT_FILE:
210 get_input_file = tv->tv_u.tv_get_input_file;
212 case LDPT_RELEASE_INPUT_FILE:
213 release_input_file = tv->tv_u.tv_release_input_file;
215 case LDPT_ADD_SYMBOLS:
216 add_symbols = tv->tv_u.tv_add_symbols;
218 case LDPT_GET_SYMBOLS_V2:
219 get_symbols = tv->tv_u.tv_get_symbols;
221 case LDPT_ADD_INPUT_FILE:
222 add_input_file = tv->tv_u.tv_add_input_file;
224 case LDPT_SET_EXTRA_LIBRARY_PATH:
225 set_extra_library_path = tv->tv_u.tv_set_extra_library_path;
228 get_view = tv->tv_u.tv_get_view;
231 message = tv->tv_u.tv_message;
238 if (!registeredClaimFile) {
239 message(LDPL_ERROR, "register_claim_file not passed to LLVMgold.");
243 message(LDPL_ERROR, "add_symbols not passed to LLVMgold.");
247 if (!RegisteredAllSymbolsRead)
250 if (!get_input_file) {
251 message(LDPL_ERROR, "get_input_file not passed to LLVMgold.");
254 if (!release_input_file) {
255 message(LDPL_ERROR, "relesase_input_file not passed to LLVMgold.");
262 static const GlobalObject *getBaseObject(const GlobalValue &GV) {
263 if (auto *GA = dyn_cast<GlobalAlias>(&GV))
264 return GA->getBaseObject();
265 return cast<GlobalObject>(&GV);
268 static bool shouldSkip(uint32_t Symflags) {
269 if (!(Symflags & object::BasicSymbolRef::SF_Global))
271 if (Symflags & object::BasicSymbolRef::SF_FormatSpecific)
276 static void diagnosticHandler(const DiagnosticInfo &DI, void *Context) {
277 if (const auto *BDI = dyn_cast<BitcodeDiagnosticInfo>(&DI)) {
278 std::error_code EC = BDI->getError();
279 if (EC == BitcodeError::InvalidBitcodeSignature)
283 std::string ErrStorage;
285 raw_string_ostream OS(ErrStorage);
286 DiagnosticPrinterRawOStream DP(OS);
289 ld_plugin_level Level;
290 switch (DI.getSeverity()) {
292 message(LDPL_FATAL, "LLVM gold plugin has failed to create LTO module: %s",
294 llvm_unreachable("Fatal doesn't return.");
296 Level = LDPL_WARNING;
301 // FIXME: Just ignore remarks for now. They are always passed by
302 // if there is a custom diagnostic handler, so we get flooded.
306 message(Level, "LLVM gold plugin: %s", ErrStorage.c_str());
309 /// Called by gold to see whether this file is one that our plugin can handle.
310 /// We'll try to open it and register all the symbols with add_symbol if
312 static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
315 MemoryBufferRef BufferRef;
316 std::unique_ptr<MemoryBuffer> Buffer;
319 if (get_view(file->handle, &view) != LDPS_OK) {
320 message(LDPL_ERROR, "Failed to get a view of %s", file->name);
323 BufferRef = MemoryBufferRef(StringRef((const char *)view, file->filesize), "");
326 // Gold has found what might be IR part-way inside of a file, such as
329 offset = file->offset;
331 ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
332 MemoryBuffer::getOpenFileSlice(file->fd, file->name, file->filesize,
334 if (std::error_code EC = BufferOrErr.getError()) {
335 message(LDPL_ERROR, EC.message().c_str());
338 Buffer = std::move(BufferOrErr.get());
339 BufferRef = Buffer->getMemBufferRef();
342 Context.setDiagnosticHandler(diagnosticHandler);
343 ErrorOr<std::unique_ptr<object::IRObjectFile>> ObjOrErr =
344 object::IRObjectFile::create(BufferRef, Context);
345 std::error_code EC = ObjOrErr.getError();
346 if (EC == object::object_error::invalid_file_type ||
347 EC == object::object_error::bitcode_section_not_found)
353 message(LDPL_ERROR, "LLVM gold plugin has failed to create LTO module: %s",
354 EC.message().c_str());
357 std::unique_ptr<object::IRObjectFile> Obj = std::move(*ObjOrErr);
359 Modules.resize(Modules.size() + 1);
360 claimed_file &cf = Modules.back();
362 cf.handle = file->handle;
364 for (auto &Sym : Obj->symbols()) {
365 uint32_t Symflags = Sym.getFlags();
366 if (shouldSkip(Symflags))
369 cf.syms.push_back(ld_plugin_symbol());
370 ld_plugin_symbol &sym = cf.syms.back();
371 sym.version = nullptr;
373 SmallString<64> Name;
375 raw_svector_ostream OS(Name);
378 sym.name = strdup(Name.c_str());
380 const GlobalValue *GV = Obj->getSymbolGV(Sym.getRawDataRefImpl());
382 sym.visibility = LDPV_DEFAULT;
384 switch (GV->getVisibility()) {
385 case GlobalValue::DefaultVisibility:
386 sym.visibility = LDPV_DEFAULT;
388 case GlobalValue::HiddenVisibility:
389 sym.visibility = LDPV_HIDDEN;
391 case GlobalValue::ProtectedVisibility:
392 sym.visibility = LDPV_PROTECTED;
397 if (Symflags & object::BasicSymbolRef::SF_Undefined) {
398 sym.def = LDPK_UNDEF;
399 if (GV && GV->hasExternalWeakLinkage())
400 sym.def = LDPK_WEAKUNDEF;
404 assert(!GV->hasExternalWeakLinkage() &&
405 !GV->hasAvailableExternallyLinkage() && "Not a declaration!");
406 if (GV->hasCommonLinkage())
407 sym.def = LDPK_COMMON;
408 else if (GV->isWeakForLinker())
409 sym.def = LDPK_WEAKDEF;
414 sym.comdat_key = nullptr;
416 const GlobalObject *Base = getBaseObject(*GV);
418 message(LDPL_FATAL, "Unable to determine comdat of alias!");
419 const Comdat *C = Base->getComdat();
421 sym.comdat_key = strdup(C->getName().str().c_str());
422 else if (Base->hasWeakLinkage() || Base->hasLinkOnceLinkage())
423 sym.comdat_key = strdup(sym.name);
426 sym.resolution = LDPR_UNKNOWN;
429 if (!cf.syms.empty()) {
430 if (add_symbols(cf.handle, cf.syms.size(), &cf.syms[0]) != LDPS_OK) {
431 message(LDPL_ERROR, "Unable to add symbols!");
439 static void keepGlobalValue(GlobalValue &GV,
440 std::vector<GlobalAlias *> &KeptAliases) {
441 assert(!GV.hasLocalLinkage());
443 if (auto *GA = dyn_cast<GlobalAlias>(&GV))
444 KeptAliases.push_back(GA);
446 switch (GV.getLinkage()) {
449 case GlobalValue::LinkOnceAnyLinkage:
450 GV.setLinkage(GlobalValue::WeakAnyLinkage);
452 case GlobalValue::LinkOnceODRLinkage:
453 GV.setLinkage(GlobalValue::WeakODRLinkage);
457 assert(!GV.isDiscardableIfUnused());
460 static void internalize(GlobalValue &GV) {
461 if (GV.isDeclarationForLinker())
462 return; // We get here if there is a matching asm definition.
463 if (!GV.hasLocalLinkage())
464 GV.setLinkage(GlobalValue::InternalLinkage);
467 static void drop(GlobalValue &GV) {
468 if (auto *F = dyn_cast<Function>(&GV)) {
470 F->setComdat(nullptr); // Should deleteBody do this?
474 if (auto *Var = dyn_cast<GlobalVariable>(&GV)) {
475 Var->setInitializer(nullptr);
477 GlobalValue::ExternalLinkage); // Should setInitializer do this?
478 Var->setComdat(nullptr); // and this?
482 auto &Alias = cast<GlobalAlias>(GV);
483 Module &M = *Alias.getParent();
484 PointerType &Ty = *cast<PointerType>(Alias.getType());
485 GlobalValue::LinkageTypes L = Alias.getLinkage();
487 new GlobalVariable(M, Ty.getElementType(), /*isConstant*/ false, L,
488 /*Initializer*/ nullptr);
489 Var->takeName(&Alias);
490 Alias.replaceAllUsesWith(Var);
491 Alias.eraseFromParent();
494 static const char *getResolutionName(ld_plugin_symbol_resolution R) {
500 case LDPR_PREVAILING_DEF:
501 return "PREVAILING_DEF";
502 case LDPR_PREVAILING_DEF_IRONLY:
503 return "PREVAILING_DEF_IRONLY";
504 case LDPR_PREEMPTED_REG:
505 return "PREEMPTED_REG";
506 case LDPR_PREEMPTED_IR:
507 return "PREEMPTED_IR";
508 case LDPR_RESOLVED_IR:
509 return "RESOLVED_IR";
510 case LDPR_RESOLVED_EXEC:
511 return "RESOLVED_EXEC";
512 case LDPR_RESOLVED_DYN:
513 return "RESOLVED_DYN";
514 case LDPR_PREVAILING_DEF_IRONLY_EXP:
515 return "PREVAILING_DEF_IRONLY_EXP";
517 llvm_unreachable("Unknown resolution");
521 class LocalValueMaterializer : public ValueMaterializer {
522 DenseSet<GlobalValue *> &Dropped;
523 DenseMap<GlobalObject *, GlobalObject *> LocalVersions;
526 LocalValueMaterializer(DenseSet<GlobalValue *> &Dropped) : Dropped(Dropped) {}
527 Value *materializeValueFor(Value *V) override;
531 Value *LocalValueMaterializer::materializeValueFor(Value *V) {
532 auto *GO = dyn_cast<GlobalObject>(V);
536 auto I = LocalVersions.find(GO);
537 if (I != LocalVersions.end())
540 if (!Dropped.count(GO))
543 Module &M = *GO->getParent();
544 GlobalValue::LinkageTypes L = GO->getLinkage();
545 GlobalObject *Declaration;
546 if (auto *F = dyn_cast<Function>(GO)) {
547 Declaration = Function::Create(F->getFunctionType(), L, "", &M);
549 auto *Var = cast<GlobalVariable>(GO);
550 Declaration = new GlobalVariable(M, Var->getType()->getElementType(),
551 Var->isConstant(), L,
552 /*Initializer*/ nullptr);
554 Declaration->takeName(GO);
555 Declaration->copyAttributesFrom(GO);
557 GO->setLinkage(GlobalValue::InternalLinkage);
558 GO->setName(Declaration->getName());
560 GO->replaceAllUsesWith(Declaration);
562 LocalVersions[Declaration] = GO;
567 static Constant *mapConstantToLocalCopy(Constant *C, ValueToValueMapTy &VM,
568 LocalValueMaterializer *Materializer) {
569 return MapValue(C, VM, RF_IgnoreMissingEntries, nullptr, Materializer);
572 static void freeSymName(ld_plugin_symbol &Sym) {
574 free(Sym.comdat_key);
576 Sym.comdat_key = nullptr;
579 static std::unique_ptr<Module>
580 getModuleForFile(LLVMContext &Context, claimed_file &F,
581 ld_plugin_input_file &Info, raw_fd_ostream *ApiFile,
582 StringSet<> &Internalize, StringSet<> &Maybe) {
584 if (get_symbols(F.handle, F.syms.size(), &F.syms[0]) != LDPS_OK)
585 message(LDPL_FATAL, "Failed to get symbol information");
588 if (get_view(F.handle, &View) != LDPS_OK)
589 message(LDPL_FATAL, "Failed to get a view of file");
591 MemoryBufferRef BufferRef(StringRef((const char *)View, Info.filesize),
593 ErrorOr<std::unique_ptr<object::IRObjectFile>> ObjOrErr =
594 object::IRObjectFile::create(BufferRef, Context);
596 if (std::error_code EC = ObjOrErr.getError())
597 message(LDPL_FATAL, "Could not read bitcode from file : %s",
598 EC.message().c_str());
600 object::IRObjectFile &Obj = **ObjOrErr;
602 Module &M = Obj.getModule();
606 SmallPtrSet<GlobalValue *, 8> Used;
607 collectUsedGlobalVariables(M, Used, /*CompilerUsed*/ false);
609 DenseSet<GlobalValue *> Drop;
610 std::vector<GlobalAlias *> KeptAliases;
613 for (auto &ObjSym : Obj.symbols()) {
614 if (shouldSkip(ObjSym.getFlags()))
616 ld_plugin_symbol &Sym = F.syms[SymNum];
619 ld_plugin_symbol_resolution Resolution =
620 (ld_plugin_symbol_resolution)Sym.resolution;
622 if (options::generate_api_file)
623 *ApiFile << Sym.name << ' ' << getResolutionName(Resolution) << '\n';
625 GlobalValue *GV = Obj.getSymbolGV(ObjSym.getRawDataRefImpl());
628 continue; // Asm symbol.
631 if (Resolution != LDPR_PREVAILING_DEF_IRONLY && GV->hasCommonLinkage()) {
632 // Common linkage is special. There is no single symbol that wins the
633 // resolution. Instead we have to collect the maximum alignment and size.
634 // The IR linker does that for us if we just pass it every common GV.
635 // We still have to keep track of LDPR_PREVAILING_DEF_IRONLY so we
636 // internalize once the IR linker has done its job.
641 switch (Resolution) {
643 llvm_unreachable("Unexpected resolution");
645 case LDPR_RESOLVED_IR:
646 case LDPR_RESOLVED_EXEC:
647 case LDPR_RESOLVED_DYN:
648 assert(GV->isDeclarationForLinker());
652 if (!GV->isDeclarationForLinker()) {
653 assert(GV->hasComdat());
658 case LDPR_PREVAILING_DEF_IRONLY: {
659 keepGlobalValue(*GV, KeptAliases);
660 if (!Used.count(GV)) {
661 // Since we use the regular lib/Linker, we cannot just internalize GV
662 // now or it will not be copied to the merged module. Instead we force
663 // it to be copied and then internalize it.
664 Internalize.insert(GV->getName());
669 case LDPR_PREVAILING_DEF:
670 keepGlobalValue(*GV, KeptAliases);
673 case LDPR_PREEMPTED_IR:
674 // Gold might have selected a linkonce_odr and preempted a weak_odr.
675 // In that case we have to make sure we don't end up internalizing it.
676 if (!GV->isDiscardableIfUnused())
677 Maybe.erase(GV->getName());
680 case LDPR_PREEMPTED_REG:
684 case LDPR_PREVAILING_DEF_IRONLY_EXP: {
685 // We can only check for address uses after we merge the modules. The
686 // reason is that this GV might have a copy in another module
687 // and in that module the address might be significant, but that
688 // copy will be LDPR_PREEMPTED_IR.
689 if (GV->hasLinkOnceODRLinkage())
690 Maybe.insert(GV->getName());
691 keepGlobalValue(*GV, KeptAliases);
699 ValueToValueMapTy VM;
700 LocalValueMaterializer Materializer(Drop);
701 for (GlobalAlias *GA : KeptAliases) {
702 // Gold told us to keep GA. It is possible that a GV usied in the aliasee
703 // expression is being dropped. If that is the case, that GV must be copied.
704 Constant *Aliasee = GA->getAliasee();
705 Constant *Replacement = mapConstantToLocalCopy(Aliasee, VM, &Materializer);
706 GA->setAliasee(Replacement);
709 for (auto *GV : Drop)
712 return Obj.takeModule();
715 static void runLTOPasses(Module &M, TargetMachine &TM) {
716 if (const DataLayout *DL = TM.getDataLayout())
719 legacy::PassManager passes;
720 passes.add(new DataLayoutPass());
721 passes.add(createTargetTransformInfoWrapperPass(TM.getTargetIRAnalysis()));
723 PassManagerBuilder PMB;
724 PMB.LibraryInfo = new TargetLibraryInfoImpl(Triple(TM.getTargetTriple()));
725 PMB.Inliner = createFunctionInliningPass();
726 PMB.VerifyInput = true;
727 PMB.VerifyOutput = true;
728 PMB.LoopVectorize = true;
729 PMB.SLPVectorize = true;
730 PMB.populateLTOPassManager(passes);
734 static void saveBCFile(StringRef Path, Module &M) {
736 raw_fd_ostream OS(Path, EC, sys::fs::OpenFlags::F_None);
738 message(LDPL_FATAL, "Failed to write the output file.");
739 WriteBitcodeToFile(&M, OS);
742 static void codegen(Module &M) {
743 const std::string &TripleStr = M.getTargetTriple();
744 Triple TheTriple(TripleStr);
747 const Target *TheTarget = TargetRegistry::lookupTarget(TripleStr, ErrMsg);
749 message(LDPL_FATAL, "Target not found: %s", ErrMsg.c_str());
751 if (unsigned NumOpts = options::extra.size())
752 cl::ParseCommandLineOptions(NumOpts, &options::extra[0]);
754 SubtargetFeatures Features;
755 Features.getDefaultSubtargetFeatures(TheTriple);
756 for (const std::string &A : MAttrs)
757 Features.AddFeature(A);
759 TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
760 std::unique_ptr<TargetMachine> TM(TheTarget->createTargetMachine(
761 TripleStr, options::mcpu, Features.getString(), Options, RelocationModel,
762 CodeModel::Default, CodeGenOpt::Aggressive));
764 runLTOPasses(M, *TM);
766 if (options::TheOutputType == options::OT_SAVE_TEMPS)
767 saveBCFile(output_name + ".opt.bc", M);
769 legacy::PassManager CodeGenPasses;
770 CodeGenPasses.add(new DataLayoutPass());
772 SmallString<128> Filename;
774 if (options::obj_path.empty()) {
776 sys::fs::createTemporaryFile("lto-llvm", "o", FD, Filename);
778 message(LDPL_FATAL, "Could not create temporary file: %s",
779 EC.message().c_str());
781 Filename = options::obj_path;
783 sys::fs::openFileForWrite(Filename.c_str(), FD, sys::fs::F_None);
785 message(LDPL_FATAL, "Could not open file: %s", EC.message().c_str());
789 raw_fd_ostream OS(FD, true);
790 formatted_raw_ostream FOS(OS);
792 if (TM->addPassesToEmitFile(CodeGenPasses, FOS,
793 TargetMachine::CGFT_ObjectFile))
794 message(LDPL_FATAL, "Failed to setup codegen");
795 CodeGenPasses.run(M);
798 if (add_input_file(Filename.c_str()) != LDPS_OK)
800 "Unable to add .o file to the link. File left behind in: %s",
803 if (options::obj_path.empty())
804 Cleanup.push_back(Filename.c_str());
807 /// gold informs us that all symbols have been read. At this point, we use
808 /// get_symbols to see if any of our definitions have been overridden by a
809 /// native object file. Then, perform optimization and codegen.
810 static ld_plugin_status allSymbolsReadHook(raw_fd_ostream *ApiFile) {
815 Context.setDiagnosticHandler(diagnosticHandler);
817 std::unique_ptr<Module> Combined(new Module("ld-temp.o", Context));
818 Linker L(Combined.get());
820 std::string DefaultTriple = sys::getDefaultTargetTriple();
822 StringSet<> Internalize;
824 for (claimed_file &F : Modules) {
825 ld_plugin_input_file File;
826 if (get_input_file(F.handle, &File) != LDPS_OK)
827 message(LDPL_FATAL, "Failed to get file information");
828 std::unique_ptr<Module> M =
829 getModuleForFile(Context, F, File, ApiFile, Internalize, Maybe);
830 if (!options::triple.empty())
831 M->setTargetTriple(options::triple.c_str());
832 else if (M->getTargetTriple().empty()) {
833 M->setTargetTriple(DefaultTriple);
836 if (L.linkInModule(M.get()))
837 message(LDPL_FATAL, "Failed to link module");
838 if (release_input_file(F.handle) != LDPS_OK)
839 message(LDPL_FATAL, "Failed to release file information");
842 for (const auto &Name : Internalize) {
843 GlobalValue *GV = Combined->getNamedValue(Name.first());
848 for (const auto &Name : Maybe) {
849 GlobalValue *GV = Combined->getNamedValue(Name.first());
852 GV->setLinkage(GlobalValue::LinkOnceODRLinkage);
853 if (canBeOmittedFromSymbolTable(GV))
857 if (options::TheOutputType == options::OT_DISABLE)
860 if (options::TheOutputType != options::OT_NORMAL) {
862 if (options::TheOutputType == options::OT_BC_ONLY)
865 path = output_name + ".bc";
866 saveBCFile(path, *L.getModule());
867 if (options::TheOutputType == options::OT_BC_ONLY)
871 codegen(*L.getModule());
873 if (!options::extra_library_path.empty() &&
874 set_extra_library_path(options::extra_library_path.c_str()) != LDPS_OK)
875 message(LDPL_FATAL, "Unable to set the extra library path.");
880 static ld_plugin_status all_symbols_read_hook(void) {
881 ld_plugin_status Ret;
882 if (!options::generate_api_file) {
883 Ret = allSymbolsReadHook(nullptr);
886 raw_fd_ostream ApiFile("apifile.txt", EC, sys::fs::F_None);
888 message(LDPL_FATAL, "Unable to open apifile.txt for writing: %s",
889 EC.message().c_str());
890 Ret = allSymbolsReadHook(&ApiFile);
895 if (options::TheOutputType == options::OT_BC_ONLY ||
896 options::TheOutputType == options::OT_DISABLE) {
897 if (options::TheOutputType == options::OT_DISABLE)
898 // Remove the output file here since ld.bfd creates the output file
900 sys::fs::remove(output_name);
907 static ld_plugin_status cleanup_hook(void) {
908 for (std::string &Name : Cleanup) {
909 std::error_code EC = sys::fs::remove(Name);
911 message(LDPL_ERROR, "Failed to delete '%s': %s", Name.c_str(),
912 EC.message().c_str());