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/Bitcode/ReaderWriter.h"
19 #include "llvm/CodeGen/Analysis.h"
20 #include "llvm/CodeGen/CommandFlags.h"
21 #include "llvm/IR/LLVMContext.h"
22 #include "llvm/IR/Module.h"
23 #include "llvm/IR/Verifier.h"
24 #include "llvm/Linker/Linker.h"
25 #include "llvm/MC/SubtargetFeature.h"
26 #include "llvm/Object/IRObjectFile.h"
27 #include "llvm/PassManager.h"
28 #include "llvm/Support/FormattedStream.h"
29 #include "llvm/Support/Host.h"
30 #include "llvm/Support/MemoryBuffer.h"
31 #include "llvm/Support/TargetRegistry.h"
32 #include "llvm/Support/TargetSelect.h"
33 #include "llvm/Target/TargetLibraryInfo.h"
34 #include "llvm/Transforms/IPO.h"
35 #include "llvm/Transforms/IPO/PassManagerBuilder.h"
36 #include "llvm/Transforms/Utils/GlobalStatus.h"
37 #include "llvm/Transforms/Utils/ModuleUtils.h"
38 #include "llvm/Transforms/Utils/ValueMapper.h"
40 #include <plugin-api.h>
41 #include <system_error>
45 // FIXME: remove this declaration when we stop maintaining Ubuntu Quantal and
46 // Precise and Debian Wheezy (binutils 2.23 is required)
55 std::vector<ld_plugin_symbol> syms;
59 static ld_plugin_status discard_message(int level, const char *format, ...) {
60 // Die loudly. Recent versions of Gold pass ld_plugin_message as the first
61 // callback in the transfer vector. This should never be called.
65 static ld_plugin_get_input_file get_input_file = nullptr;
66 static ld_plugin_release_input_file release_input_file = nullptr;
67 static ld_plugin_add_symbols add_symbols = nullptr;
68 static ld_plugin_get_symbols get_symbols = nullptr;
69 static ld_plugin_add_input_file add_input_file = nullptr;
70 static ld_plugin_set_extra_library_path set_extra_library_path = nullptr;
71 static ld_plugin_get_view get_view = nullptr;
72 static ld_plugin_message message = discard_message;
73 static Reloc::Model RelocationModel = Reloc::Default;
74 static std::string output_name = "";
75 static std::list<claimed_file> Modules;
76 static std::vector<std::string> Cleanup;
77 static llvm::TargetOptions TargetOpts;
80 enum generate_bc { BC_NO, BC_ALSO, BC_ONLY };
81 static bool generate_api_file = false;
82 static generate_bc generate_bc_file = BC_NO;
83 static std::string bc_path;
84 static std::string obj_path;
85 static std::string extra_library_path;
86 static std::string triple;
87 static std::string mcpu;
88 // Additional options to pass into the code generator.
89 // Note: This array will contain all plugin options which are not claimed
90 // as plugin exclusive to pass to the code generator.
91 // For example, "generate-api-file" and "as"options are for the plugin
92 // use only and will not be passed.
93 static std::vector<const char *> extra;
95 static void process_plugin_option(const char* opt_)
99 llvm::StringRef opt = opt_;
101 if (opt == "generate-api-file") {
102 generate_api_file = true;
103 } else if (opt.startswith("mcpu=")) {
104 mcpu = opt.substr(strlen("mcpu="));
105 } else if (opt.startswith("extra-library-path=")) {
106 extra_library_path = opt.substr(strlen("extra_library_path="));
107 } else if (opt.startswith("mtriple=")) {
108 triple = opt.substr(strlen("mtriple="));
109 } else if (opt.startswith("obj-path=")) {
110 obj_path = opt.substr(strlen("obj-path="));
111 } else if (opt == "emit-llvm") {
112 generate_bc_file = BC_ONLY;
113 } else if (opt == "also-emit-llvm") {
114 generate_bc_file = BC_ALSO;
115 } else if (opt.startswith("also-emit-llvm=")) {
116 llvm::StringRef path = opt.substr(strlen("also-emit-llvm="));
117 generate_bc_file = BC_ALSO;
118 if (!bc_path.empty()) {
119 message(LDPL_WARNING, "Path to the output IL file specified twice. "
126 // Save this option to pass to the code generator.
127 // ParseCommandLineOptions() expects argv[0] to be program name. Lazily
130 extra.push_back("LLVMgold");
132 extra.push_back(opt_);
137 static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
139 static ld_plugin_status all_symbols_read_hook(void);
140 static ld_plugin_status cleanup_hook(void);
142 extern "C" ld_plugin_status onload(ld_plugin_tv *tv);
143 ld_plugin_status onload(ld_plugin_tv *tv) {
144 InitializeAllTargetInfos();
145 InitializeAllTargets();
146 InitializeAllTargetMCs();
147 InitializeAllAsmParsers();
148 InitializeAllAsmPrinters();
150 // We're given a pointer to the first transfer vector. We read through them
151 // until we find one where tv_tag == LDPT_NULL. The REGISTER_* tagged values
152 // contain pointers to functions that we need to call to register our own
153 // hooks. The others are addresses of functions we can use to call into gold
156 bool registeredClaimFile = false;
157 bool RegisteredAllSymbolsRead = false;
159 for (; tv->tv_tag != LDPT_NULL; ++tv) {
160 switch (tv->tv_tag) {
161 case LDPT_OUTPUT_NAME:
162 output_name = tv->tv_u.tv_string;
164 case LDPT_LINKER_OUTPUT:
165 switch (tv->tv_u.tv_val) {
167 case LDPO_DYN: // .so
168 case LDPO_PIE: // position independent executable
169 RelocationModel = Reloc::PIC_;
171 case LDPO_EXEC: // .exe
172 RelocationModel = Reloc::Static;
175 message(LDPL_ERROR, "Unknown output file type %d", tv->tv_u.tv_val);
180 options::process_plugin_option(tv->tv_u.tv_string);
182 case LDPT_REGISTER_CLAIM_FILE_HOOK: {
183 ld_plugin_register_claim_file callback;
184 callback = tv->tv_u.tv_register_claim_file;
186 if (callback(claim_file_hook) != LDPS_OK)
189 registeredClaimFile = true;
191 case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: {
192 ld_plugin_register_all_symbols_read callback;
193 callback = tv->tv_u.tv_register_all_symbols_read;
195 if (callback(all_symbols_read_hook) != LDPS_OK)
198 RegisteredAllSymbolsRead = true;
200 case LDPT_REGISTER_CLEANUP_HOOK: {
201 ld_plugin_register_cleanup callback;
202 callback = tv->tv_u.tv_register_cleanup;
204 if (callback(cleanup_hook) != LDPS_OK)
207 case LDPT_GET_INPUT_FILE:
208 get_input_file = tv->tv_u.tv_get_input_file;
210 case LDPT_RELEASE_INPUT_FILE:
211 release_input_file = tv->tv_u.tv_release_input_file;
213 case LDPT_ADD_SYMBOLS:
214 add_symbols = tv->tv_u.tv_add_symbols;
216 case LDPT_GET_SYMBOLS_V2:
217 get_symbols = tv->tv_u.tv_get_symbols;
219 case LDPT_ADD_INPUT_FILE:
220 add_input_file = tv->tv_u.tv_add_input_file;
222 case LDPT_SET_EXTRA_LIBRARY_PATH:
223 set_extra_library_path = tv->tv_u.tv_set_extra_library_path;
226 get_view = tv->tv_u.tv_get_view;
229 message = tv->tv_u.tv_message;
236 if (!registeredClaimFile) {
237 message(LDPL_ERROR, "register_claim_file not passed to LLVMgold.");
241 message(LDPL_ERROR, "add_symbols not passed to LLVMgold.");
245 if (!RegisteredAllSymbolsRead)
248 if (!get_input_file) {
249 message(LDPL_ERROR, "get_input_file not passed to LLVMgold.");
252 if (!release_input_file) {
253 message(LDPL_ERROR, "relesase_input_file not passed to LLVMgold.");
260 static const GlobalObject *getBaseObject(const GlobalValue &GV) {
261 if (auto *GA = dyn_cast<GlobalAlias>(&GV))
262 return GA->getBaseObject();
263 return cast<GlobalObject>(&GV);
266 /// Called by gold to see whether this file is one that our plugin can handle.
267 /// We'll try to open it and register all the symbols with add_symbol if
269 static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
272 std::unique_ptr<MemoryBuffer> buffer;
275 if (get_view(file->handle, &view) != LDPS_OK) {
276 message(LDPL_ERROR, "Failed to get a view of %s", file->name);
279 buffer.reset(MemoryBuffer::getMemBuffer(
280 StringRef((char *)view, file->filesize), "", false));
283 // Gold has found what might be IR part-way inside of a file, such as
286 offset = file->offset;
288 ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
289 MemoryBuffer::getOpenFileSlice(file->fd, file->name, file->filesize,
291 if (std::error_code EC = BufferOrErr.getError()) {
292 message(LDPL_ERROR, EC.message().c_str());
295 buffer = std::move(BufferOrErr.get());
298 ErrorOr<object::IRObjectFile *> ObjOrErr =
299 object::IRObjectFile::createIRObjectFile(buffer->getMemBufferRef(),
301 std::error_code EC = ObjOrErr.getError();
302 if (EC == BitcodeError::InvalidBitcodeSignature)
308 message(LDPL_ERROR, "LLVM gold plugin has failed to create LTO module: %s",
309 EC.message().c_str());
312 std::unique_ptr<object::IRObjectFile> Obj(ObjOrErr.get());
314 Modules.resize(Modules.size() + 1);
315 claimed_file &cf = Modules.back();
317 cf.handle = file->handle;
319 for (auto &Sym : Obj->symbols()) {
320 uint32_t Symflags = Sym.getFlags();
321 if (!(Symflags & object::BasicSymbolRef::SF_Global))
324 if (Symflags & object::BasicSymbolRef::SF_FormatSpecific)
327 cf.syms.push_back(ld_plugin_symbol());
328 ld_plugin_symbol &sym = cf.syms.back();
329 sym.version = nullptr;
331 SmallString<64> Name;
333 raw_svector_ostream OS(Name);
336 sym.name = strdup(Name.c_str());
338 const GlobalValue *GV = Obj->getSymbolGV(Sym.getRawDataRefImpl());
340 sym.visibility = LDPV_DEFAULT;
342 switch (GV->getVisibility()) {
343 case GlobalValue::DefaultVisibility:
344 sym.visibility = LDPV_DEFAULT;
346 case GlobalValue::HiddenVisibility:
347 sym.visibility = LDPV_HIDDEN;
349 case GlobalValue::ProtectedVisibility:
350 sym.visibility = LDPV_PROTECTED;
355 if (Symflags & object::BasicSymbolRef::SF_Undefined) {
356 sym.def = LDPK_UNDEF;
357 if (GV && GV->hasExternalWeakLinkage())
358 sym.def = LDPK_WEAKUNDEF;
362 assert(!GV->hasExternalWeakLinkage() &&
363 !GV->hasAvailableExternallyLinkage() && "Not a declaration!");
364 if (GV->hasCommonLinkage())
365 sym.def = LDPK_COMMON;
366 else if (GV->isWeakForLinker())
367 sym.def = LDPK_WEAKDEF;
372 sym.comdat_key = nullptr;
374 const GlobalObject *Base = getBaseObject(*GV);
376 message(LDPL_FATAL, "Unable to determine comdat of alias!");
377 const Comdat *C = Base->getComdat();
379 sym.comdat_key = strdup(C->getName().str().c_str());
380 else if (Base->hasWeakLinkage() || Base->hasLinkOnceLinkage())
381 sym.comdat_key = strdup(sym.name);
384 sym.resolution = LDPR_UNKNOWN;
387 if (!cf.syms.empty()) {
388 if (add_symbols(cf.handle, cf.syms.size(), &cf.syms[0]) != LDPS_OK) {
389 message(LDPL_ERROR, "Unable to add symbols!");
397 static void keepGlobalValue(GlobalValue &GV,
398 std::vector<GlobalAlias *> &KeptAliases) {
399 assert(!GV.hasLocalLinkage());
401 if (auto *GA = dyn_cast<GlobalAlias>(&GV))
402 KeptAliases.push_back(GA);
404 switch (GV.getLinkage()) {
407 case GlobalValue::LinkOnceAnyLinkage:
408 GV.setLinkage(GlobalValue::WeakAnyLinkage);
410 case GlobalValue::LinkOnceODRLinkage:
411 GV.setLinkage(GlobalValue::WeakODRLinkage);
415 assert(!GV.isDiscardableIfUnused());
418 static bool isDeclaration(const GlobalValue &V) {
419 if (V.hasAvailableExternallyLinkage())
422 if (V.isMaterializable())
425 return V.isDeclaration();
428 static void internalize(GlobalValue &GV) {
429 if (isDeclaration(GV))
430 return; // We get here if there is a matching asm definition.
431 if (!GV.hasLocalLinkage())
432 GV.setLinkage(GlobalValue::InternalLinkage);
435 static void drop(GlobalValue &GV) {
436 if (auto *F = dyn_cast<Function>(&GV)) {
438 F->setComdat(nullptr); // Should deleteBody do this?
442 if (auto *Var = dyn_cast<GlobalVariable>(&GV)) {
443 Var->setInitializer(nullptr);
445 GlobalValue::ExternalLinkage); // Should setInitializer do this?
446 Var->setComdat(nullptr); // and this?
450 auto &Alias = cast<GlobalAlias>(GV);
451 Module &M = *Alias.getParent();
452 PointerType &Ty = *cast<PointerType>(Alias.getType());
453 GlobalValue::LinkageTypes L = Alias.getLinkage();
455 new GlobalVariable(M, Ty.getElementType(), /*isConstant*/ false, L,
456 /*Initializer*/ nullptr);
457 Var->takeName(&Alias);
458 Alias.replaceAllUsesWith(Var);
461 static const char *getResolutionName(ld_plugin_symbol_resolution R) {
467 case LDPR_PREVAILING_DEF:
468 return "PREVAILING_DEF";
469 case LDPR_PREVAILING_DEF_IRONLY:
470 return "PREVAILING_DEF_IRONLY";
471 case LDPR_PREEMPTED_REG:
472 return "PREEMPTED_REG";
473 case LDPR_PREEMPTED_IR:
474 return "PREEMPTED_IR";
475 case LDPR_RESOLVED_IR:
476 return "RESOLVED_IR";
477 case LDPR_RESOLVED_EXEC:
478 return "RESOLVED_EXEC";
479 case LDPR_RESOLVED_DYN:
480 return "RESOLVED_DYN";
481 case LDPR_PREVAILING_DEF_IRONLY_EXP:
482 return "PREVAILING_DEF_IRONLY_EXP";
486 static GlobalObject *makeInternalReplacement(GlobalObject *GO) {
487 Module *M = GO->getParent();
489 if (auto *F = dyn_cast<Function>(GO)) {
490 auto *NewF = Function::Create(
491 F->getFunctionType(), GlobalValue::InternalLinkage, F->getName(), M);
492 NewF->getBasicBlockList().splice(NewF->end(), F->getBasicBlockList());
496 auto *Var = cast<GlobalVariable>(GO);
497 Ret = new GlobalVariable(
498 *M, Var->getType()->getElementType(), Var->isConstant(),
499 GlobalValue::InternalLinkage, Var->getInitializer(), Var->getName(),
500 nullptr, Var->getThreadLocalMode(), Var->getType()->getAddressSpace(),
501 Var->isExternallyInitialized());
502 Var->setInitializer(nullptr);
504 Ret->copyAttributesFrom(GO);
505 Ret->setComdat(GO->getComdat());
511 class LocalValueMaterializer : public ValueMaterializer {
512 DenseSet<GlobalValue *> &Dropped;
515 LocalValueMaterializer(DenseSet<GlobalValue *> &Dropped) : Dropped(Dropped) {}
516 Value *materializeValueFor(Value *V) override;
520 Value *LocalValueMaterializer::materializeValueFor(Value *V) {
521 auto *GV = dyn_cast<GlobalValue>(V);
524 if (!Dropped.count(GV))
526 assert(!isa<GlobalAlias>(GV) && "Found alias point to weak alias.");
527 return makeInternalReplacement(cast<GlobalObject>(GV));
530 static Constant *mapConstantToLocalCopy(Constant *C, ValueToValueMapTy &VM,
531 LocalValueMaterializer *Materializer) {
532 return MapValue(C, VM, RF_IgnoreMissingEntries, nullptr, Materializer);
535 static std::unique_ptr<Module>
536 getModuleForFile(LLVMContext &Context, claimed_file &F, raw_fd_ostream *ApiFile,
537 StringSet<> &Internalize, StringSet<> &Maybe) {
538 ld_plugin_input_file File;
539 if (get_input_file(F.handle, &File) != LDPS_OK)
540 message(LDPL_FATAL, "Failed to get file information");
542 if (get_symbols(F.handle, F.syms.size(), &F.syms[0]) != LDPS_OK)
543 message(LDPL_FATAL, "Failed to get symbol information");
546 if (get_view(F.handle, &View) != LDPS_OK)
547 message(LDPL_FATAL, "Failed to get a view of file");
549 std::unique_ptr<MemoryBuffer> Buffer(MemoryBuffer::getMemBuffer(
550 StringRef((char *)View, File.filesize), "", false));
552 if (release_input_file(F.handle) != LDPS_OK)
553 message(LDPL_FATAL, "Failed to release file information");
555 ErrorOr<Module *> MOrErr = getLazyBitcodeModule(Buffer, Context);
557 if (std::error_code EC = MOrErr.getError())
558 message(LDPL_FATAL, "Could not read bitcode from file : %s",
559 EC.message().c_str());
561 std::unique_ptr<Module> M(MOrErr.get());
563 SmallPtrSet<GlobalValue *, 8> Used;
564 collectUsedGlobalVariables(*M, Used, /*CompilerUsed*/ false);
566 DenseSet<GlobalValue *> Drop;
567 std::vector<GlobalAlias *> KeptAliases;
568 for (ld_plugin_symbol &Sym : F.syms) {
569 ld_plugin_symbol_resolution Resolution =
570 (ld_plugin_symbol_resolution)Sym.resolution;
572 if (options::generate_api_file)
573 *ApiFile << Sym.name << ' ' << getResolutionName(Resolution) << '\n';
575 GlobalValue *GV = M->getNamedValue(Sym.name);
577 continue; // Asm symbol.
579 switch (Resolution) {
581 llvm_unreachable("Unexpected resolution");
583 case LDPR_RESOLVED_IR:
584 case LDPR_RESOLVED_EXEC:
585 case LDPR_RESOLVED_DYN:
587 assert(isDeclaration(*GV));
590 case LDPR_PREVAILING_DEF_IRONLY: {
591 keepGlobalValue(*GV, KeptAliases);
592 if (!Used.count(GV)) {
593 // Since we use the regular lib/Linker, we cannot just internalize GV
594 // now or it will not be copied to the merged module. Instead we force
595 // it to be copied and then internalize it.
596 Internalize.insert(Sym.name);
601 case LDPR_PREVAILING_DEF:
602 keepGlobalValue(*GV, KeptAliases);
605 case LDPR_PREEMPTED_REG:
606 case LDPR_PREEMPTED_IR:
610 case LDPR_PREVAILING_DEF_IRONLY_EXP: {
611 // We can only check for address uses after we merge the modules. The
612 // reason is that this GV might have a copy in another module
613 // and in that module the address might be significant, but that
614 // copy will be LDPR_PREEMPTED_IR.
615 if (GV->hasLinkOnceODRLinkage())
616 Maybe.insert(Sym.name);
617 keepGlobalValue(*GV, KeptAliases);
623 free(Sym.comdat_key);
625 Sym.comdat_key = nullptr;
629 // This is horrible. Given how lazy loading is implemented, dropping
630 // the body while there is a materializer present doesn't work, the
631 // linker will just read the body back.
632 M->materializeAllPermanently();
634 ValueToValueMapTy VM;
635 LocalValueMaterializer Materializer(Drop);
636 for (GlobalAlias *GA : KeptAliases) {
637 // Gold told us to keep GA. It is possible that a GV usied in the aliasee
638 // expression is being dropped. If that is the case, that GV must be copied.
639 Constant *Aliasee = GA->getAliasee();
640 Constant *Replacement = mapConstantToLocalCopy(Aliasee, VM, &Materializer);
641 if (Aliasee != Replacement)
642 GA->setAliasee(Replacement);
645 for (auto *GV : Drop)
651 static void runLTOPasses(Module &M, TargetMachine &TM) {
653 PassManagerBuilder PMB;
654 PMB.LibraryInfo = new TargetLibraryInfo(Triple(TM.getTargetTriple()));
655 PMB.Inliner = createFunctionInliningPass();
656 PMB.VerifyInput = true;
657 PMB.VerifyOutput = true;
658 PMB.populateLTOPassManager(passes, &TM);
662 static void codegen(Module &M) {
663 const std::string &TripleStr = M.getTargetTriple();
664 Triple TheTriple(TripleStr);
667 const Target *TheTarget = TargetRegistry::lookupTarget(TripleStr, ErrMsg);
669 message(LDPL_FATAL, "Target not found: %s", ErrMsg.c_str());
671 if (unsigned NumOpts = options::extra.size())
672 cl::ParseCommandLineOptions(NumOpts, &options::extra[0]);
674 SubtargetFeatures Features;
675 Features.getDefaultSubtargetFeatures(TheTriple);
676 for (const std::string &A : MAttrs)
677 Features.AddFeature(A);
679 TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
680 std::unique_ptr<TargetMachine> TM(TheTarget->createTargetMachine(
681 TripleStr, options::mcpu, Features.getString(), Options, RelocationModel,
682 CodeModel::Default, CodeGenOpt::Aggressive));
684 runLTOPasses(M, *TM);
686 PassManager CodeGenPasses;
687 CodeGenPasses.add(new DataLayoutPass(&M));
689 SmallString<128> Filename;
691 if (options::obj_path.empty()) {
693 sys::fs::createTemporaryFile("lto-llvm", "o", FD, Filename);
695 message(LDPL_FATAL, "Could not create temorary file: %s",
696 EC.message().c_str());
698 Filename = options::obj_path;
700 sys::fs::openFileForWrite(Filename.c_str(), FD, sys::fs::F_None);
702 message(LDPL_FATAL, "Could not open file: %s", EC.message().c_str());
706 raw_fd_ostream OS(FD, true);
707 formatted_raw_ostream FOS(OS);
709 if (TM->addPassesToEmitFile(CodeGenPasses, FOS,
710 TargetMachine::CGFT_ObjectFile))
711 message(LDPL_FATAL, "Failed to setup codegen");
712 CodeGenPasses.run(M);
715 if (add_input_file(Filename.c_str()) != LDPS_OK)
717 "Unable to add .o file to the link. File left behind in: %s",
720 if (options::obj_path.empty())
721 Cleanup.push_back(Filename.c_str());
724 /// gold informs us that all symbols have been read. At this point, we use
725 /// get_symbols to see if any of our definitions have been overridden by a
726 /// native object file. Then, perform optimization and codegen.
727 static ld_plugin_status allSymbolsReadHook(raw_fd_ostream *ApiFile) {
732 std::unique_ptr<Module> Combined(new Module("ld-temp.o", Context));
733 Linker L(Combined.get());
735 std::string DefaultTriple = sys::getDefaultTargetTriple();
737 StringSet<> Internalize;
739 for (claimed_file &F : Modules) {
740 std::unique_ptr<Module> M =
741 getModuleForFile(Context, F, ApiFile, Internalize, Maybe);
742 if (!options::triple.empty())
743 M->setTargetTriple(options::triple.c_str());
744 else if (M->getTargetTriple().empty()) {
745 M->setTargetTriple(DefaultTriple);
749 if (L.linkInModule(M.get(), &ErrMsg))
750 message(LDPL_FATAL, "Failed to link module: %s", ErrMsg.c_str());
753 for (const auto &Name : Internalize) {
754 GlobalValue *GV = Combined->getNamedValue(Name.first());
759 for (const auto &Name : Maybe) {
760 GlobalValue *GV = Combined->getNamedValue(Name.first());
763 GV->setLinkage(GlobalValue::LinkOnceODRLinkage);
764 if (canBeOmittedFromSymbolTable(GV))
768 if (options::generate_bc_file != options::BC_NO) {
770 if (options::generate_bc_file == options::BC_ONLY)
772 else if (!options::bc_path.empty())
773 path = options::bc_path;
775 path = output_name + ".bc";
778 raw_fd_ostream OS(path, EC, sys::fs::OpenFlags::F_None);
780 message(LDPL_FATAL, "Failed to write the output file.");
781 WriteBitcodeToFile(L.getModule(), OS);
783 if (options::generate_bc_file == options::BC_ONLY)
787 codegen(*L.getModule());
789 if (!options::extra_library_path.empty() &&
790 set_extra_library_path(options::extra_library_path.c_str()) != LDPS_OK)
791 message(LDPL_FATAL, "Unable to set the extra library path.");
796 static ld_plugin_status all_symbols_read_hook(void) {
797 ld_plugin_status Ret;
798 if (!options::generate_api_file) {
799 Ret = allSymbolsReadHook(nullptr);
802 raw_fd_ostream ApiFile("apifile.txt", EC, sys::fs::F_None);
804 message(LDPL_FATAL, "Unable to open apifile.txt for writing: %s",
805 EC.message().c_str());
806 Ret = allSymbolsReadHook(&ApiFile);
809 if (options::generate_bc_file == options::BC_ONLY)
815 static ld_plugin_status cleanup_hook(void) {
816 for (std::string &Name : Cleanup) {
817 std::error_code EC = sys::fs::remove(Name);
819 message(LDPL_ERROR, "Failed to delete '%s': %s", Name.c_str(),
820 EC.message().c_str());