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/Constants.h"
22 #include "llvm/IR/LLVMContext.h"
23 #include "llvm/IR/Module.h"
24 #include "llvm/IR/Verifier.h"
25 #include "llvm/Linker/Linker.h"
26 #include "llvm/MC/SubtargetFeature.h"
27 #include "llvm/Object/IRObjectFile.h"
28 #include "llvm/PassManager.h"
29 #include "llvm/Support/FormattedStream.h"
30 #include "llvm/Support/Host.h"
31 #include "llvm/Support/MemoryBuffer.h"
32 #include "llvm/Support/TargetRegistry.h"
33 #include "llvm/Support/TargetSelect.h"
34 #include "llvm/Target/TargetLibraryInfo.h"
35 #include "llvm/Transforms/IPO.h"
36 #include "llvm/Transforms/IPO/PassManagerBuilder.h"
37 #include "llvm/Transforms/Utils/GlobalStatus.h"
38 #include "llvm/Transforms/Utils/ModuleUtils.h"
39 #include "llvm/Transforms/Utils/ValueMapper.h"
41 #include <plugin-api.h>
42 #include <system_error>
46 // FIXME: remove this declaration when we stop maintaining Ubuntu Quantal and
47 // Precise and Debian Wheezy (binutils 2.23 is required)
56 std::vector<ld_plugin_symbol> syms;
60 static ld_plugin_status discard_message(int level, const char *format, ...) {
61 // Die loudly. Recent versions of Gold pass ld_plugin_message as the first
62 // callback in the transfer vector. This should never be called.
66 static ld_plugin_get_input_file get_input_file = nullptr;
67 static ld_plugin_release_input_file release_input_file = nullptr;
68 static ld_plugin_add_symbols add_symbols = nullptr;
69 static ld_plugin_get_symbols get_symbols = nullptr;
70 static ld_plugin_add_input_file add_input_file = nullptr;
71 static ld_plugin_set_extra_library_path set_extra_library_path = nullptr;
72 static ld_plugin_get_view get_view = nullptr;
73 static ld_plugin_message message = discard_message;
74 static Reloc::Model RelocationModel = Reloc::Default;
75 static std::string output_name = "";
76 static std::list<claimed_file> Modules;
77 static std::vector<std::string> Cleanup;
78 static llvm::TargetOptions TargetOpts;
81 enum generate_bc { BC_NO, BC_ALSO, BC_ONLY };
82 static bool generate_api_file = false;
83 static generate_bc generate_bc_file = BC_NO;
84 static std::string bc_path;
85 static std::string obj_path;
86 static std::string extra_library_path;
87 static std::string triple;
88 static std::string mcpu;
89 // Additional options to pass into the code generator.
90 // Note: This array will contain all plugin options which are not claimed
91 // as plugin exclusive to pass to the code generator.
92 // For example, "generate-api-file" and "as"options are for the plugin
93 // use only and will not be passed.
94 static std::vector<const char *> extra;
96 static void process_plugin_option(const char* opt_)
100 llvm::StringRef opt = opt_;
102 if (opt == "generate-api-file") {
103 generate_api_file = true;
104 } else if (opt.startswith("mcpu=")) {
105 mcpu = opt.substr(strlen("mcpu="));
106 } else if (opt.startswith("extra-library-path=")) {
107 extra_library_path = opt.substr(strlen("extra_library_path="));
108 } else if (opt.startswith("mtriple=")) {
109 triple = opt.substr(strlen("mtriple="));
110 } else if (opt.startswith("obj-path=")) {
111 obj_path = opt.substr(strlen("obj-path="));
112 } else if (opt == "emit-llvm") {
113 generate_bc_file = BC_ONLY;
114 } else if (opt == "also-emit-llvm") {
115 generate_bc_file = BC_ALSO;
116 } else if (opt.startswith("also-emit-llvm=")) {
117 llvm::StringRef path = opt.substr(strlen("also-emit-llvm="));
118 generate_bc_file = BC_ALSO;
119 if (!bc_path.empty()) {
120 message(LDPL_WARNING, "Path to the output IL file specified twice. "
127 // Save this option to pass to the code generator.
128 // ParseCommandLineOptions() expects argv[0] to be program name. Lazily
131 extra.push_back("LLVMgold");
133 extra.push_back(opt_);
138 static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
140 static ld_plugin_status all_symbols_read_hook(void);
141 static ld_plugin_status cleanup_hook(void);
143 extern "C" ld_plugin_status onload(ld_plugin_tv *tv);
144 ld_plugin_status onload(ld_plugin_tv *tv) {
145 InitializeAllTargetInfos();
146 InitializeAllTargets();
147 InitializeAllTargetMCs();
148 InitializeAllAsmParsers();
149 InitializeAllAsmPrinters();
151 // We're given a pointer to the first transfer vector. We read through them
152 // until we find one where tv_tag == LDPT_NULL. The REGISTER_* tagged values
153 // contain pointers to functions that we need to call to register our own
154 // hooks. The others are addresses of functions we can use to call into gold
157 bool registeredClaimFile = false;
158 bool RegisteredAllSymbolsRead = false;
160 for (; tv->tv_tag != LDPT_NULL; ++tv) {
161 switch (tv->tv_tag) {
162 case LDPT_OUTPUT_NAME:
163 output_name = tv->tv_u.tv_string;
165 case LDPT_LINKER_OUTPUT:
166 switch (tv->tv_u.tv_val) {
168 case LDPO_DYN: // .so
169 case LDPO_PIE: // position independent executable
170 RelocationModel = Reloc::PIC_;
172 case LDPO_EXEC: // .exe
173 RelocationModel = Reloc::Static;
176 message(LDPL_ERROR, "Unknown output file type %d", tv->tv_u.tv_val);
181 options::process_plugin_option(tv->tv_u.tv_string);
183 case LDPT_REGISTER_CLAIM_FILE_HOOK: {
184 ld_plugin_register_claim_file callback;
185 callback = tv->tv_u.tv_register_claim_file;
187 if (callback(claim_file_hook) != LDPS_OK)
190 registeredClaimFile = true;
192 case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: {
193 ld_plugin_register_all_symbols_read callback;
194 callback = tv->tv_u.tv_register_all_symbols_read;
196 if (callback(all_symbols_read_hook) != LDPS_OK)
199 RegisteredAllSymbolsRead = true;
201 case LDPT_REGISTER_CLEANUP_HOOK: {
202 ld_plugin_register_cleanup callback;
203 callback = tv->tv_u.tv_register_cleanup;
205 if (callback(cleanup_hook) != LDPS_OK)
208 case LDPT_GET_INPUT_FILE:
209 get_input_file = tv->tv_u.tv_get_input_file;
211 case LDPT_RELEASE_INPUT_FILE:
212 release_input_file = tv->tv_u.tv_release_input_file;
214 case LDPT_ADD_SYMBOLS:
215 add_symbols = tv->tv_u.tv_add_symbols;
217 case LDPT_GET_SYMBOLS_V2:
218 get_symbols = tv->tv_u.tv_get_symbols;
220 case LDPT_ADD_INPUT_FILE:
221 add_input_file = tv->tv_u.tv_add_input_file;
223 case LDPT_SET_EXTRA_LIBRARY_PATH:
224 set_extra_library_path = tv->tv_u.tv_set_extra_library_path;
227 get_view = tv->tv_u.tv_get_view;
230 message = tv->tv_u.tv_message;
237 if (!registeredClaimFile) {
238 message(LDPL_ERROR, "register_claim_file not passed to LLVMgold.");
242 message(LDPL_ERROR, "add_symbols not passed to LLVMgold.");
246 if (!RegisteredAllSymbolsRead)
249 if (!get_input_file) {
250 message(LDPL_ERROR, "get_input_file not passed to LLVMgold.");
253 if (!release_input_file) {
254 message(LDPL_ERROR, "relesase_input_file not passed to LLVMgold.");
261 static const GlobalObject *getBaseObject(const GlobalValue &GV) {
262 if (auto *GA = dyn_cast<GlobalAlias>(&GV))
263 return GA->getBaseObject();
264 return cast<GlobalObject>(&GV);
267 /// Called by gold to see whether this file is one that our plugin can handle.
268 /// We'll try to open it and register all the symbols with add_symbol if
270 static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
273 MemoryBufferRef BufferRef;
274 std::unique_ptr<MemoryBuffer> Buffer;
277 if (get_view(file->handle, &view) != LDPS_OK) {
278 message(LDPL_ERROR, "Failed to get a view of %s", file->name);
281 BufferRef = MemoryBufferRef(StringRef((char *)view, file->filesize), "");
284 // Gold has found what might be IR part-way inside of a file, such as
287 offset = file->offset;
289 ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
290 MemoryBuffer::getOpenFileSlice(file->fd, file->name, file->filesize,
292 if (std::error_code EC = BufferOrErr.getError()) {
293 message(LDPL_ERROR, EC.message().c_str());
296 Buffer = std::move(BufferOrErr.get());
297 BufferRef = Buffer->getMemBufferRef();
300 ErrorOr<std::unique_ptr<object::IRObjectFile>> ObjOrErr =
301 object::IRObjectFile::createIRObjectFile(BufferRef, Context);
302 std::error_code EC = ObjOrErr.getError();
303 if (EC == BitcodeError::InvalidBitcodeSignature)
309 message(LDPL_ERROR, "LLVM gold plugin has failed to create LTO module: %s",
310 EC.message().c_str());
313 std::unique_ptr<object::IRObjectFile> Obj = std::move(*ObjOrErr);
315 Modules.resize(Modules.size() + 1);
316 claimed_file &cf = Modules.back();
318 cf.handle = file->handle;
320 for (auto &Sym : Obj->symbols()) {
321 uint32_t Symflags = Sym.getFlags();
322 if (!(Symflags & object::BasicSymbolRef::SF_Global))
325 if (Symflags & object::BasicSymbolRef::SF_FormatSpecific)
328 cf.syms.push_back(ld_plugin_symbol());
329 ld_plugin_symbol &sym = cf.syms.back();
330 sym.version = nullptr;
332 SmallString<64> Name;
334 raw_svector_ostream OS(Name);
337 sym.name = strdup(Name.c_str());
339 const GlobalValue *GV = Obj->getSymbolGV(Sym.getRawDataRefImpl());
341 sym.visibility = LDPV_DEFAULT;
343 switch (GV->getVisibility()) {
344 case GlobalValue::DefaultVisibility:
345 sym.visibility = LDPV_DEFAULT;
347 case GlobalValue::HiddenVisibility:
348 sym.visibility = LDPV_HIDDEN;
350 case GlobalValue::ProtectedVisibility:
351 sym.visibility = LDPV_PROTECTED;
356 if (Symflags & object::BasicSymbolRef::SF_Undefined) {
357 sym.def = LDPK_UNDEF;
358 if (GV && GV->hasExternalWeakLinkage())
359 sym.def = LDPK_WEAKUNDEF;
363 assert(!GV->hasExternalWeakLinkage() &&
364 !GV->hasAvailableExternallyLinkage() && "Not a declaration!");
365 if (GV->hasCommonLinkage())
366 sym.def = LDPK_COMMON;
367 else if (GV->isWeakForLinker())
368 sym.def = LDPK_WEAKDEF;
373 sym.comdat_key = nullptr;
375 const GlobalObject *Base = getBaseObject(*GV);
377 message(LDPL_FATAL, "Unable to determine comdat of alias!");
378 const Comdat *C = Base->getComdat();
380 sym.comdat_key = strdup(C->getName().str().c_str());
381 else if (Base->hasWeakLinkage() || Base->hasLinkOnceLinkage())
382 sym.comdat_key = strdup(sym.name);
385 sym.resolution = LDPR_UNKNOWN;
388 if (!cf.syms.empty()) {
389 if (add_symbols(cf.handle, cf.syms.size(), &cf.syms[0]) != LDPS_OK) {
390 message(LDPL_ERROR, "Unable to add symbols!");
398 static void keepGlobalValue(GlobalValue &GV,
399 std::vector<GlobalAlias *> &KeptAliases) {
400 assert(!GV.hasLocalLinkage());
402 if (auto *GA = dyn_cast<GlobalAlias>(&GV))
403 KeptAliases.push_back(GA);
405 switch (GV.getLinkage()) {
408 case GlobalValue::LinkOnceAnyLinkage:
409 GV.setLinkage(GlobalValue::WeakAnyLinkage);
411 case GlobalValue::LinkOnceODRLinkage:
412 GV.setLinkage(GlobalValue::WeakODRLinkage);
416 assert(!GV.isDiscardableIfUnused());
419 static bool isDeclaration(const GlobalValue &V) {
420 if (V.hasAvailableExternallyLinkage())
423 if (V.isMaterializable())
426 return V.isDeclaration();
429 static void internalize(GlobalValue &GV) {
430 if (isDeclaration(GV))
431 return; // We get here if there is a matching asm definition.
432 if (!GV.hasLocalLinkage())
433 GV.setLinkage(GlobalValue::InternalLinkage);
436 static void drop(GlobalValue &GV) {
437 if (auto *F = dyn_cast<Function>(&GV)) {
439 F->setComdat(nullptr); // Should deleteBody do this?
443 if (auto *Var = dyn_cast<GlobalVariable>(&GV)) {
444 Var->setInitializer(nullptr);
446 GlobalValue::ExternalLinkage); // Should setInitializer do this?
447 Var->setComdat(nullptr); // and this?
451 auto &Alias = cast<GlobalAlias>(GV);
452 Module &M = *Alias.getParent();
453 PointerType &Ty = *cast<PointerType>(Alias.getType());
454 GlobalValue::LinkageTypes L = Alias.getLinkage();
456 new GlobalVariable(M, Ty.getElementType(), /*isConstant*/ false, L,
457 /*Initializer*/ nullptr);
458 Var->takeName(&Alias);
459 Alias.replaceAllUsesWith(Var);
460 Alias.eraseFromParent();
463 static const char *getResolutionName(ld_plugin_symbol_resolution R) {
469 case LDPR_PREVAILING_DEF:
470 return "PREVAILING_DEF";
471 case LDPR_PREVAILING_DEF_IRONLY:
472 return "PREVAILING_DEF_IRONLY";
473 case LDPR_PREEMPTED_REG:
474 return "PREEMPTED_REG";
475 case LDPR_PREEMPTED_IR:
476 return "PREEMPTED_IR";
477 case LDPR_RESOLVED_IR:
478 return "RESOLVED_IR";
479 case LDPR_RESOLVED_EXEC:
480 return "RESOLVED_EXEC";
481 case LDPR_RESOLVED_DYN:
482 return "RESOLVED_DYN";
483 case LDPR_PREVAILING_DEF_IRONLY_EXP:
484 return "PREVAILING_DEF_IRONLY_EXP";
488 static GlobalObject *makeInternalReplacement(GlobalObject *GO) {
489 Module *M = GO->getParent();
491 if (auto *F = dyn_cast<Function>(GO)) {
492 auto *NewF = Function::Create(
493 F->getFunctionType(), GlobalValue::InternalLinkage, F->getName(), M);
494 NewF->getBasicBlockList().splice(NewF->end(), F->getBasicBlockList());
498 auto *Var = cast<GlobalVariable>(GO);
499 Ret = new GlobalVariable(
500 *M, Var->getType()->getElementType(), Var->isConstant(),
501 GlobalValue::InternalLinkage, Var->getInitializer(), Var->getName(),
502 nullptr, Var->getThreadLocalMode(), Var->getType()->getAddressSpace(),
503 Var->isExternallyInitialized());
504 Var->setInitializer(nullptr);
506 Ret->copyAttributesFrom(GO);
507 Ret->setComdat(GO->getComdat());
513 class LocalValueMaterializer : public ValueMaterializer {
514 DenseSet<GlobalValue *> &Dropped;
517 LocalValueMaterializer(DenseSet<GlobalValue *> &Dropped) : Dropped(Dropped) {}
518 Value *materializeValueFor(Value *V) override;
522 Value *LocalValueMaterializer::materializeValueFor(Value *V) {
523 auto *GV = dyn_cast<GlobalValue>(V);
526 if (!Dropped.count(GV))
528 assert(!isa<GlobalAlias>(GV) && "Found alias point to weak alias.");
529 return makeInternalReplacement(cast<GlobalObject>(GV));
532 static Constant *mapConstantToLocalCopy(Constant *C, ValueToValueMapTy &VM,
533 LocalValueMaterializer *Materializer) {
534 return MapValue(C, VM, RF_IgnoreMissingEntries, nullptr, Materializer);
537 static std::unique_ptr<Module>
538 getModuleForFile(LLVMContext &Context, claimed_file &F, raw_fd_ostream *ApiFile,
539 StringSet<> &Internalize, StringSet<> &Maybe) {
540 ld_plugin_input_file File;
541 if (get_input_file(F.handle, &File) != LDPS_OK)
542 message(LDPL_FATAL, "Failed to get file information");
544 if (get_symbols(F.handle, F.syms.size(), &F.syms[0]) != LDPS_OK)
545 message(LDPL_FATAL, "Failed to get symbol information");
548 if (get_view(F.handle, &View) != LDPS_OK)
549 message(LDPL_FATAL, "Failed to get a view of file");
551 std::unique_ptr<MemoryBuffer> Buffer = MemoryBuffer::getMemBuffer(
552 StringRef((char *)View, File.filesize), "", false);
554 if (release_input_file(F.handle) != LDPS_OK)
555 message(LDPL_FATAL, "Failed to release file information");
557 ErrorOr<Module *> MOrErr = getLazyBitcodeModule(std::move(Buffer), Context);
559 if (std::error_code EC = MOrErr.getError())
560 message(LDPL_FATAL, "Could not read bitcode from file : %s",
561 EC.message().c_str());
563 std::unique_ptr<Module> M(MOrErr.get());
565 SmallPtrSet<GlobalValue *, 8> Used;
566 collectUsedGlobalVariables(*M, Used, /*CompilerUsed*/ false);
568 DenseSet<GlobalValue *> Drop;
569 std::vector<GlobalAlias *> KeptAliases;
570 for (ld_plugin_symbol &Sym : F.syms) {
571 ld_plugin_symbol_resolution Resolution =
572 (ld_plugin_symbol_resolution)Sym.resolution;
574 if (options::generate_api_file)
575 *ApiFile << Sym.name << ' ' << getResolutionName(Resolution) << '\n';
577 GlobalValue *GV = M->getNamedValue(Sym.name);
579 continue; // Asm symbol.
581 if (GV->hasCommonLinkage()) {
582 // Common linkage is special. There is no single symbol that wins the
583 // resolution. Instead we have to collect the maximum alignment and size.
584 // The IR linker does that for us if we just pass it every common GV.
588 switch (Resolution) {
590 llvm_unreachable("Unexpected resolution");
592 case LDPR_RESOLVED_IR:
593 case LDPR_RESOLVED_EXEC:
594 case LDPR_RESOLVED_DYN:
596 assert(isDeclaration(*GV));
599 case LDPR_PREVAILING_DEF_IRONLY: {
600 keepGlobalValue(*GV, KeptAliases);
601 if (!Used.count(GV)) {
602 // Since we use the regular lib/Linker, we cannot just internalize GV
603 // now or it will not be copied to the merged module. Instead we force
604 // it to be copied and then internalize it.
605 Internalize.insert(Sym.name);
610 case LDPR_PREVAILING_DEF:
611 keepGlobalValue(*GV, KeptAliases);
614 case LDPR_PREEMPTED_REG:
615 case LDPR_PREEMPTED_IR:
619 case LDPR_PREVAILING_DEF_IRONLY_EXP: {
620 // We can only check for address uses after we merge the modules. The
621 // reason is that this GV might have a copy in another module
622 // and in that module the address might be significant, but that
623 // copy will be LDPR_PREEMPTED_IR.
624 if (GV->hasLinkOnceODRLinkage())
625 Maybe.insert(Sym.name);
626 keepGlobalValue(*GV, KeptAliases);
632 free(Sym.comdat_key);
634 Sym.comdat_key = nullptr;
638 // This is horrible. Given how lazy loading is implemented, dropping
639 // the body while there is a materializer present doesn't work, the
640 // linker will just read the body back.
641 M->materializeAllPermanently();
643 ValueToValueMapTy VM;
644 LocalValueMaterializer Materializer(Drop);
645 for (GlobalAlias *GA : KeptAliases) {
646 // Gold told us to keep GA. It is possible that a GV usied in the aliasee
647 // expression is being dropped. If that is the case, that GV must be copied.
648 Constant *Aliasee = GA->getAliasee();
649 Constant *Replacement = mapConstantToLocalCopy(Aliasee, VM, &Materializer);
650 if (Aliasee != Replacement)
651 GA->setAliasee(Replacement);
654 for (auto *GV : Drop)
660 static void runLTOPasses(Module &M, TargetMachine &TM) {
662 PassManagerBuilder PMB;
663 PMB.LibraryInfo = new TargetLibraryInfo(Triple(TM.getTargetTriple()));
664 PMB.Inliner = createFunctionInliningPass();
665 PMB.VerifyInput = true;
666 PMB.VerifyOutput = true;
667 PMB.populateLTOPassManager(passes, &TM);
671 static void codegen(Module &M) {
672 const std::string &TripleStr = M.getTargetTriple();
673 Triple TheTriple(TripleStr);
676 const Target *TheTarget = TargetRegistry::lookupTarget(TripleStr, ErrMsg);
678 message(LDPL_FATAL, "Target not found: %s", ErrMsg.c_str());
680 if (unsigned NumOpts = options::extra.size())
681 cl::ParseCommandLineOptions(NumOpts, &options::extra[0]);
683 SubtargetFeatures Features;
684 Features.getDefaultSubtargetFeatures(TheTriple);
685 for (const std::string &A : MAttrs)
686 Features.AddFeature(A);
688 TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
689 std::unique_ptr<TargetMachine> TM(TheTarget->createTargetMachine(
690 TripleStr, options::mcpu, Features.getString(), Options, RelocationModel,
691 CodeModel::Default, CodeGenOpt::Aggressive));
693 runLTOPasses(M, *TM);
695 PassManager CodeGenPasses;
696 CodeGenPasses.add(new DataLayoutPass(&M));
698 SmallString<128> Filename;
700 if (options::obj_path.empty()) {
702 sys::fs::createTemporaryFile("lto-llvm", "o", FD, Filename);
704 message(LDPL_FATAL, "Could not create temorary file: %s",
705 EC.message().c_str());
707 Filename = options::obj_path;
709 sys::fs::openFileForWrite(Filename.c_str(), FD, sys::fs::F_None);
711 message(LDPL_FATAL, "Could not open file: %s", EC.message().c_str());
715 raw_fd_ostream OS(FD, true);
716 formatted_raw_ostream FOS(OS);
718 if (TM->addPassesToEmitFile(CodeGenPasses, FOS,
719 TargetMachine::CGFT_ObjectFile))
720 message(LDPL_FATAL, "Failed to setup codegen");
721 CodeGenPasses.run(M);
724 if (add_input_file(Filename.c_str()) != LDPS_OK)
726 "Unable to add .o file to the link. File left behind in: %s",
729 if (options::obj_path.empty())
730 Cleanup.push_back(Filename.c_str());
733 /// gold informs us that all symbols have been read. At this point, we use
734 /// get_symbols to see if any of our definitions have been overridden by a
735 /// native object file. Then, perform optimization and codegen.
736 static ld_plugin_status allSymbolsReadHook(raw_fd_ostream *ApiFile) {
741 std::unique_ptr<Module> Combined(new Module("ld-temp.o", Context));
742 Linker L(Combined.get());
744 std::string DefaultTriple = sys::getDefaultTargetTriple();
746 StringSet<> Internalize;
748 for (claimed_file &F : Modules) {
749 std::unique_ptr<Module> M =
750 getModuleForFile(Context, F, ApiFile, Internalize, Maybe);
751 if (!options::triple.empty())
752 M->setTargetTriple(options::triple.c_str());
753 else if (M->getTargetTriple().empty()) {
754 M->setTargetTriple(DefaultTriple);
758 if (L.linkInModule(M.get(), &ErrMsg))
759 message(LDPL_FATAL, "Failed to link module: %s", ErrMsg.c_str());
762 for (const auto &Name : Internalize) {
763 GlobalValue *GV = Combined->getNamedValue(Name.first());
768 for (const auto &Name : Maybe) {
769 GlobalValue *GV = Combined->getNamedValue(Name.first());
772 GV->setLinkage(GlobalValue::LinkOnceODRLinkage);
773 if (canBeOmittedFromSymbolTable(GV))
777 if (options::generate_bc_file != options::BC_NO) {
779 if (options::generate_bc_file == options::BC_ONLY)
781 else if (!options::bc_path.empty())
782 path = options::bc_path;
784 path = output_name + ".bc";
787 raw_fd_ostream OS(path, EC, sys::fs::OpenFlags::F_None);
789 message(LDPL_FATAL, "Failed to write the output file.");
790 WriteBitcodeToFile(L.getModule(), OS);
792 if (options::generate_bc_file == options::BC_ONLY)
796 codegen(*L.getModule());
798 if (!options::extra_library_path.empty() &&
799 set_extra_library_path(options::extra_library_path.c_str()) != LDPS_OK)
800 message(LDPL_FATAL, "Unable to set the extra library path.");
805 static ld_plugin_status all_symbols_read_hook(void) {
806 ld_plugin_status Ret;
807 if (!options::generate_api_file) {
808 Ret = allSymbolsReadHook(nullptr);
811 raw_fd_ostream ApiFile("apifile.txt", EC, sys::fs::F_None);
813 message(LDPL_FATAL, "Unable to open apifile.txt for writing: %s",
814 EC.message().c_str());
815 Ret = allSymbolsReadHook(&ApiFile);
818 if (options::generate_bc_file == options::BC_ONLY)
824 static ld_plugin_status cleanup_hook(void) {
825 for (std::string &Name : Cleanup) {
826 std::error_code EC = sys::fs::remove(Name);
828 message(LDPL_ERROR, "Failed to delete '%s': %s", Name.c_str(),
829 EC.message().c_str());