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diff --git a/llvm/lib/LTO/LTOModule.cpp b/llvm/lib/LTO/LTOModule.cpp
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+//===-- LTOModule.cpp - LLVM Link Time Optimizer --------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Link Time Optimization library. This library is
+// intended to be used by linker to optimize code at link time.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/LTO/legacy/LTOModule.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Bitcode/BitcodeReader.h"
+#include "llvm/CodeGen/TargetSubtargetInfo.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Mangler.h"
+#include "llvm/IR/Metadata.h"
+#include "llvm/IR/Module.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCParser/MCAsmParser.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/SubtargetFeature.h"
+#include "llvm/Object/IRObjectFile.h"
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Transforms/Utils/GlobalStatus.h"
+#include <system_error>
+using namespace llvm;
+using namespace llvm::object;
+
+LTOModule::LTOModule(std::unique_ptr<Module> M, MemoryBufferRef MBRef,
+ llvm::TargetMachine *TM)
+ : Mod(std::move(M)), MBRef(MBRef), _target(TM) {
+ SymTab.addModule(Mod.get());
+}
+
+LTOModule::~LTOModule() {}
+
+/// isBitcodeFile - Returns 'true' if the file (or memory contents) is LLVM
+/// bitcode.
+bool LTOModule::isBitcodeFile(const void *Mem, size_t Length) {
+ Expected<MemoryBufferRef> BCData = IRObjectFile::findBitcodeInMemBuffer(
+ MemoryBufferRef(StringRef((const char *)Mem, Length), "<mem>"));
+ return !errorToBool(BCData.takeError());
+}
+
+bool LTOModule::isBitcodeFile(StringRef Path) {
+ ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
+ MemoryBuffer::getFile(Path);
+ if (!BufferOrErr)
+ return false;
+
+ Expected<MemoryBufferRef> BCData = IRObjectFile::findBitcodeInMemBuffer(
+ BufferOrErr.get()->getMemBufferRef());
+ return !errorToBool(BCData.takeError());
+}
+
+bool LTOModule::isThinLTO() {
+ Expected<BitcodeLTOInfo> Result = getBitcodeLTOInfo(MBRef);
+ if (!Result) {
+ logAllUnhandledErrors(Result.takeError(), errs());
+ return false;
+ }
+ return Result->IsThinLTO;
+}
+
+bool LTOModule::isBitcodeForTarget(MemoryBuffer *Buffer,
+ StringRef TriplePrefix) {
+ Expected<MemoryBufferRef> BCOrErr =
+ IRObjectFile::findBitcodeInMemBuffer(Buffer->getMemBufferRef());
+ if (errorToBool(BCOrErr.takeError()))
+ return false;
+ LLVMContext Context;
+ ErrorOr<std::string> TripleOrErr =
+ expectedToErrorOrAndEmitErrors(Context, getBitcodeTargetTriple(*BCOrErr));
+ if (!TripleOrErr)
+ return false;
+ return StringRef(*TripleOrErr).startswith(TriplePrefix);
+}
+
+std::string LTOModule::getProducerString(MemoryBuffer *Buffer) {
+ Expected<MemoryBufferRef> BCOrErr =
+ IRObjectFile::findBitcodeInMemBuffer(Buffer->getMemBufferRef());
+ if (errorToBool(BCOrErr.takeError()))
+ return "";
+ LLVMContext Context;
+ ErrorOr<std::string> ProducerOrErr = expectedToErrorOrAndEmitErrors(
+ Context, getBitcodeProducerString(*BCOrErr));
+ if (!ProducerOrErr)
+ return "";
+ return *ProducerOrErr;
+}
+
+ErrorOr<std::unique_ptr<LTOModule>>
+LTOModule::createFromFile(LLVMContext &Context, StringRef path,
+ const TargetOptions &options) {
+ ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
+ MemoryBuffer::getFile(path);
+ if (std::error_code EC = BufferOrErr.getError()) {
+ Context.emitError(EC.message());
+ return EC;
+ }
+ std::unique_ptr<MemoryBuffer> Buffer = std::move(BufferOrErr.get());
+ return makeLTOModule(Buffer->getMemBufferRef(), options, Context,
+ /* ShouldBeLazy*/ false);
+}
+
+ErrorOr<std::unique_ptr<LTOModule>>
+LTOModule::createFromOpenFile(LLVMContext &Context, int fd, StringRef path,
+ size_t size, const TargetOptions &options) {
+ return createFromOpenFileSlice(Context, fd, path, size, 0, options);
+}
+
+ErrorOr<std::unique_ptr<LTOModule>>
+LTOModule::createFromOpenFileSlice(LLVMContext &Context, int fd, StringRef path,
+ size_t map_size, off_t offset,
+ const TargetOptions &options) {
+ ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
+ MemoryBuffer::getOpenFileSlice(sys::fs::convertFDToNativeFile(fd), path,
+ map_size, offset);
+ if (std::error_code EC = BufferOrErr.getError()) {
+ Context.emitError(EC.message());
+ return EC;
+ }
+ std::unique_ptr<MemoryBuffer> Buffer = std::move(BufferOrErr.get());
+ return makeLTOModule(Buffer->getMemBufferRef(), options, Context,
+ /* ShouldBeLazy */ false);
+}
+
+ErrorOr<std::unique_ptr<LTOModule>>
+LTOModule::createFromBuffer(LLVMContext &Context, const void *mem,
+ size_t length, const TargetOptions &options,
+ StringRef path) {
+ StringRef Data((const char *)mem, length);
+ MemoryBufferRef Buffer(Data, path);
+ return makeLTOModule(Buffer, options, Context, /* ShouldBeLazy */ false);
+}
+
+ErrorOr<std::unique_ptr<LTOModule>>
+LTOModule::createInLocalContext(std::unique_ptr<LLVMContext> Context,
+ const void *mem, size_t length,
+ const TargetOptions &options, StringRef path) {
+ StringRef Data((const char *)mem, length);
+ MemoryBufferRef Buffer(Data, path);
+ // If we own a context, we know this is being used only for symbol extraction,
+ // not linking. Be lazy in that case.
+ ErrorOr<std::unique_ptr<LTOModule>> Ret =
+ makeLTOModule(Buffer, options, *Context, /* ShouldBeLazy */ true);
+ if (Ret)
+ (*Ret)->OwnedContext = std::move(Context);
+ return Ret;
+}
+
+static ErrorOr<std::unique_ptr<Module>>
+parseBitcodeFileImpl(MemoryBufferRef Buffer, LLVMContext &Context,
+ bool ShouldBeLazy) {
+ // Find the buffer.
+ Expected<MemoryBufferRef> MBOrErr =
+ IRObjectFile::findBitcodeInMemBuffer(Buffer);
+ if (Error E = MBOrErr.takeError()) {
+ std::error_code EC = errorToErrorCode(std::move(E));
+ Context.emitError(EC.message());
+ return EC;
+ }
+
+ if (!ShouldBeLazy) {
+ // Parse the full file.
+ return expectedToErrorOrAndEmitErrors(Context,
+ parseBitcodeFile(*MBOrErr, Context));
+ }
+
+ // Parse lazily.
+ return expectedToErrorOrAndEmitErrors(
+ Context,
+ getLazyBitcodeModule(*MBOrErr, Context, true /*ShouldLazyLoadMetadata*/));
+}
+
+ErrorOr<std::unique_ptr<LTOModule>>
+LTOModule::makeLTOModule(MemoryBufferRef Buffer, const TargetOptions &options,
+ LLVMContext &Context, bool ShouldBeLazy) {
+ ErrorOr<std::unique_ptr<Module>> MOrErr =
+ parseBitcodeFileImpl(Buffer, Context, ShouldBeLazy);
+ if (std::error_code EC = MOrErr.getError())
+ return EC;
+ std::unique_ptr<Module> &M = *MOrErr;
+
+ std::string TripleStr = M->getTargetTriple();
+ if (TripleStr.empty())
+ TripleStr = sys::getDefaultTargetTriple();
+ llvm::Triple Triple(TripleStr);
+
+ // find machine architecture for this module
+ std::string errMsg;
+ const Target *march = TargetRegistry::lookupTarget(TripleStr, errMsg);
+ if (!march)
+ return make_error_code(object::object_error::arch_not_found);
+
+ // construct LTOModule, hand over ownership of module and target
+ SubtargetFeatures Features;
+ Features.getDefaultSubtargetFeatures(Triple);
+ std::string FeatureStr = Features.getString();
+ // Set a default CPU for Darwin triples.
+ std::string CPU;
+ if (Triple.isOSDarwin()) {
+ if (Triple.getArch() == llvm::Triple::x86_64)
+ CPU = "core2";
+ else if (Triple.getArch() == llvm::Triple::x86)
+ CPU = "yonah";
+ else if (Triple.getArch() == llvm::Triple::aarch64 ||
+ Triple.getArch() == llvm::Triple::aarch64_32)
+ CPU = "cyclone";
+ }
+
+ TargetMachine *target =
+ march->createTargetMachine(TripleStr, CPU, FeatureStr, options, None);
+
+ std::unique_ptr<LTOModule> Ret(new LTOModule(std::move(M), Buffer, target));
+ Ret->parseSymbols();
+ Ret->parseMetadata();
+
+ return std::move(Ret);
+}
+
+/// Create a MemoryBuffer from a memory range with an optional name.
+std::unique_ptr<MemoryBuffer>
+LTOModule::makeBuffer(const void *mem, size_t length, StringRef name) {
+ const char *startPtr = (const char*)mem;
+ return MemoryBuffer::getMemBuffer(StringRef(startPtr, length), name, false);
+}
+
+/// objcClassNameFromExpression - Get string that the data pointer points to.
+bool
+LTOModule::objcClassNameFromExpression(const Constant *c, std::string &name) {
+ if (const ConstantExpr *ce = dyn_cast<ConstantExpr>(c)) {
+ Constant *op = ce->getOperand(0);
+ if (GlobalVariable *gvn = dyn_cast<GlobalVariable>(op)) {
+ Constant *cn = gvn->getInitializer();
+ if (ConstantDataArray *ca = dyn_cast<ConstantDataArray>(cn)) {
+ if (ca->isCString()) {
+ name = (".objc_class_name_" + ca->getAsCString()).str();
+ return true;
+ }
+ }
+ }
+ }
+ return false;
+}
+
+/// addObjCClass - Parse i386/ppc ObjC class data structure.
+void LTOModule::addObjCClass(const GlobalVariable *clgv) {
+ const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
+ if (!c) return;
+
+ // second slot in __OBJC,__class is pointer to superclass name
+ std::string superclassName;
+ if (objcClassNameFromExpression(c->getOperand(1), superclassName)) {
+ auto IterBool =
+ _undefines.insert(std::make_pair(superclassName, NameAndAttributes()));
+ if (IterBool.second) {
+ NameAndAttributes &info = IterBool.first->second;
+ info.name = IterBool.first->first();
+ info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
+ info.isFunction = false;
+ info.symbol = clgv;
+ }
+ }
+
+ // third slot in __OBJC,__class is pointer to class name
+ std::string className;
+ if (objcClassNameFromExpression(c->getOperand(2), className)) {
+ auto Iter = _defines.insert(className).first;
+
+ NameAndAttributes info;
+ info.name = Iter->first();
+ info.attributes = LTO_SYMBOL_PERMISSIONS_DATA |
+ LTO_SYMBOL_DEFINITION_REGULAR | LTO_SYMBOL_SCOPE_DEFAULT;
+ info.isFunction = false;
+ info.symbol = clgv;
+ _symbols.push_back(info);
+ }
+}
+
+/// addObjCCategory - Parse i386/ppc ObjC category data structure.
+void LTOModule::addObjCCategory(const GlobalVariable *clgv) {
+ const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
+ if (!c) return;
+
+ // second slot in __OBJC,__category is pointer to target class name
+ std::string targetclassName;
+ if (!objcClassNameFromExpression(c->getOperand(1), targetclassName))
+ return;
+
+ auto IterBool =
+ _undefines.insert(std::make_pair(targetclassName, NameAndAttributes()));
+
+ if (!IterBool.second)
+ return;
+
+ NameAndAttributes &info = IterBool.first->second;
+ info.name = IterBool.first->first();
+ info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
+ info.isFunction = false;
+ info.symbol = clgv;
+}
+
+/// addObjCClassRef - Parse i386/ppc ObjC class list data structure.
+void LTOModule::addObjCClassRef(const GlobalVariable *clgv) {
+ std::string targetclassName;
+ if (!objcClassNameFromExpression(clgv->getInitializer(), targetclassName))
+ return;
+
+ auto IterBool =
+ _undefines.insert(std::make_pair(targetclassName, NameAndAttributes()));
+
+ if (!IterBool.second)
+ return;
+
+ NameAndAttributes &info = IterBool.first->second;
+ info.name = IterBool.first->first();
+ info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
+ info.isFunction = false;
+ info.symbol = clgv;
+}
+
+void LTOModule::addDefinedDataSymbol(ModuleSymbolTable::Symbol Sym) {
+ SmallString<64> Buffer;
+ {
+ raw_svector_ostream OS(Buffer);
+ SymTab.printSymbolName(OS, Sym);
+ Buffer.c_str();
+ }
+
+ const GlobalValue *V = Sym.get<GlobalValue *>();
+ addDefinedDataSymbol(Buffer, V);
+}
+
+void LTOModule::addDefinedDataSymbol(StringRef Name, const GlobalValue *v) {
+ // Add to list of defined symbols.
+ addDefinedSymbol(Name, v, false);
+
+ if (!v->hasSection() /* || !isTargetDarwin */)
+ return;
+
+ // Special case i386/ppc ObjC data structures in magic sections:
+ // The issue is that the old ObjC object format did some strange
+ // contortions to avoid real linker symbols. For instance, the
+ // ObjC class data structure is allocated statically in the executable
+ // that defines that class. That data structures contains a pointer to
+ // its superclass. But instead of just initializing that part of the
+ // struct to the address of its superclass, and letting the static and
+ // dynamic linkers do the rest, the runtime works by having that field
+ // instead point to a C-string that is the name of the superclass.
+ // At runtime the objc initialization updates that pointer and sets
+ // it to point to the actual super class. As far as the linker
+ // knows it is just a pointer to a string. But then someone wanted the
+ // linker to issue errors at build time if the superclass was not found.
+ // So they figured out a way in mach-o object format to use an absolute
+ // symbols (.objc_class_name_Foo = 0) and a floating reference
+ // (.reference .objc_class_name_Bar) to cause the linker into erroring when
+ // a class was missing.
+ // The following synthesizes the implicit .objc_* symbols for the linker
+ // from the ObjC data structures generated by the front end.
+
+ // special case if this data blob is an ObjC class definition
+ if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(v)) {
+ StringRef Section = GV->getSection();
+ if (Section.startswith("__OBJC,__class,")) {
+ addObjCClass(GV);
+ }
+
+ // special case if this data blob is an ObjC category definition
+ else if (Section.startswith("__OBJC,__category,")) {
+ addObjCCategory(GV);
+ }
+
+ // special case if this data blob is the list of referenced classes
+ else if (Section.startswith("__OBJC,__cls_refs,")) {
+ addObjCClassRef(GV);
+ }
+ }
+}
+
+void LTOModule::addDefinedFunctionSymbol(ModuleSymbolTable::Symbol Sym) {
+ SmallString<64> Buffer;
+ {
+ raw_svector_ostream OS(Buffer);
+ SymTab.printSymbolName(OS, Sym);
+ Buffer.c_str();
+ }
+
+ const Function *F = cast<Function>(Sym.get<GlobalValue *>());
+ addDefinedFunctionSymbol(Buffer, F);
+}
+
+void LTOModule::addDefinedFunctionSymbol(StringRef Name, const Function *F) {
+ // add to list of defined symbols
+ addDefinedSymbol(Name, F, true);
+}
+
+void LTOModule::addDefinedSymbol(StringRef Name, const GlobalValue *def,
+ bool isFunction) {
+ // set alignment part log2() can have rounding errors
+ uint32_t align = def->getAlignment();
+ uint32_t attr = align ? countTrailingZeros(align) : 0;
+
+ // set permissions part
+ if (isFunction) {
+ attr |= LTO_SYMBOL_PERMISSIONS_CODE;
+ } else {
+ const GlobalVariable *gv = dyn_cast<GlobalVariable>(def);
+ if (gv && gv->isConstant())
+ attr |= LTO_SYMBOL_PERMISSIONS_RODATA;
+ else
+ attr |= LTO_SYMBOL_PERMISSIONS_DATA;
+ }
+
+ // set definition part
+ if (def->hasWeakLinkage() || def->hasLinkOnceLinkage())
+ attr |= LTO_SYMBOL_DEFINITION_WEAK;
+ else if (def->hasCommonLinkage())
+ attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
+ else
+ attr |= LTO_SYMBOL_DEFINITION_REGULAR;
+
+ // set scope part
+ if (def->hasLocalLinkage())
+ // Ignore visibility if linkage is local.
+ attr |= LTO_SYMBOL_SCOPE_INTERNAL;
+ else if (def->hasHiddenVisibility())
+ attr |= LTO_SYMBOL_SCOPE_HIDDEN;
+ else if (def->hasProtectedVisibility())
+ attr |= LTO_SYMBOL_SCOPE_PROTECTED;
+ else if (def->canBeOmittedFromSymbolTable())
+ attr |= LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN;
+ else
+ attr |= LTO_SYMBOL_SCOPE_DEFAULT;
+
+ if (def->hasComdat())
+ attr |= LTO_SYMBOL_COMDAT;
+
+ if (isa<GlobalAlias>(def))
+ attr |= LTO_SYMBOL_ALIAS;
+
+ auto Iter = _defines.insert(Name).first;
+
+ // fill information structure
+ NameAndAttributes info;
+ StringRef NameRef = Iter->first();
+ info.name = NameRef;
+ assert(NameRef.data()[NameRef.size()] == '\0');
+ info.attributes = attr;
+ info.isFunction = isFunction;
+ info.symbol = def;
+
+ // add to table of symbols
+ _symbols.push_back(info);
+}
+
+/// addAsmGlobalSymbol - Add a global symbol from module-level ASM to the
+/// defined list.
+void LTOModule::addAsmGlobalSymbol(StringRef name,
+ lto_symbol_attributes scope) {
+ auto IterBool = _defines.insert(name);
+
+ // only add new define if not already defined
+ if (!IterBool.second)
+ return;
+
+ NameAndAttributes &info = _undefines[IterBool.first->first()];
+
+ if (info.symbol == nullptr) {
+ // FIXME: This is trying to take care of module ASM like this:
+ //
+ // module asm ".zerofill __FOO, __foo, _bar_baz_qux, 0"
+ //
+ // but is gross and its mother dresses it funny. Have the ASM parser give us
+ // more details for this type of situation so that we're not guessing so
+ // much.
+
+ // fill information structure
+ info.name = IterBool.first->first();
+ info.attributes =
+ LTO_SYMBOL_PERMISSIONS_DATA | LTO_SYMBOL_DEFINITION_REGULAR | scope;
+ info.isFunction = false;
+ info.symbol = nullptr;
+
+ // add to table of symbols
+ _symbols.push_back(info);
+ return;
+ }
+
+ if (info.isFunction)
+ addDefinedFunctionSymbol(info.name, cast<Function>(info.symbol));
+ else
+ addDefinedDataSymbol(info.name, info.symbol);
+
+ _symbols.back().attributes &= ~LTO_SYMBOL_SCOPE_MASK;
+ _symbols.back().attributes |= scope;
+}
+
+/// addAsmGlobalSymbolUndef - Add a global symbol from module-level ASM to the
+/// undefined list.
+void LTOModule::addAsmGlobalSymbolUndef(StringRef name) {
+ auto IterBool = _undefines.insert(std::make_pair(name, NameAndAttributes()));
+
+ _asm_undefines.push_back(IterBool.first->first());
+
+ // we already have the symbol
+ if (!IterBool.second)
+ return;
+
+ uint32_t attr = LTO_SYMBOL_DEFINITION_UNDEFINED;
+ attr |= LTO_SYMBOL_SCOPE_DEFAULT;
+ NameAndAttributes &info = IterBool.first->second;
+ info.name = IterBool.first->first();
+ info.attributes = attr;
+ info.isFunction = false;
+ info.symbol = nullptr;
+}
+
+/// Add a symbol which isn't defined just yet to a list to be resolved later.
+void LTOModule::addPotentialUndefinedSymbol(ModuleSymbolTable::Symbol Sym,
+ bool isFunc) {
+ SmallString<64> name;
+ {
+ raw_svector_ostream OS(name);
+ SymTab.printSymbolName(OS, Sym);
+ name.c_str();
+ }
+
+ auto IterBool = _undefines.insert(std::make_pair(name, NameAndAttributes()));
+
+ // we already have the symbol
+ if (!IterBool.second)
+ return;
+
+ NameAndAttributes &info = IterBool.first->second;
+
+ info.name = IterBool.first->first();
+
+ const GlobalValue *decl = Sym.dyn_cast<GlobalValue *>();
+
+ if (decl->hasExternalWeakLinkage())
+ info.attributes = LTO_SYMBOL_DEFINITION_WEAKUNDEF;
+ else
+ info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
+
+ info.isFunction = isFunc;
+ info.symbol = decl;
+}
+
+void LTOModule::parseSymbols() {
+ for (auto Sym : SymTab.symbols()) {
+ auto *GV = Sym.dyn_cast<GlobalValue *>();
+ uint32_t Flags = SymTab.getSymbolFlags(Sym);
+ if (Flags & object::BasicSymbolRef::SF_FormatSpecific)
+ continue;
+
+ bool IsUndefined = Flags & object::BasicSymbolRef::SF_Undefined;
+
+ if (!GV) {
+ SmallString<64> Buffer;
+ {
+ raw_svector_ostream OS(Buffer);
+ SymTab.printSymbolName(OS, Sym);
+ Buffer.c_str();
+ }
+ StringRef Name(Buffer);
+
+ if (IsUndefined)
+ addAsmGlobalSymbolUndef(Name);
+ else if (Flags & object::BasicSymbolRef::SF_Global)
+ addAsmGlobalSymbol(Name, LTO_SYMBOL_SCOPE_DEFAULT);
+ else
+ addAsmGlobalSymbol(Name, LTO_SYMBOL_SCOPE_INTERNAL);
+ continue;
+ }
+
+ auto *F = dyn_cast<Function>(GV);
+ if (IsUndefined) {
+ addPotentialUndefinedSymbol(Sym, F != nullptr);
+ continue;
+ }
+
+ if (F) {
+ addDefinedFunctionSymbol(Sym);
+ continue;
+ }
+
+ if (isa<GlobalVariable>(GV)) {
+ addDefinedDataSymbol(Sym);
+ continue;
+ }
+
+ assert(isa<GlobalAlias>(GV));
+ addDefinedDataSymbol(Sym);
+ }
+
+ // make symbols for all undefines
+ for (StringMap<NameAndAttributes>::iterator u =_undefines.begin(),
+ e = _undefines.end(); u != e; ++u) {
+ // If this symbol also has a definition, then don't make an undefine because
+ // it is a tentative definition.
+ if (_defines.count(u->getKey())) continue;
+ NameAndAttributes info = u->getValue();
+ _symbols.push_back(info);
+ }
+}
+
+/// parseMetadata - Parse metadata from the module
+void LTOModule::parseMetadata() {
+ raw_string_ostream OS(LinkerOpts);
+
+ // Linker Options
+ if (NamedMDNode *LinkerOptions =
+ getModule().getNamedMetadata("llvm.linker.options")) {
+ for (unsigned i = 0, e = LinkerOptions->getNumOperands(); i != e; ++i) {
+ MDNode *MDOptions = LinkerOptions->getOperand(i);
+ for (unsigned ii = 0, ie = MDOptions->getNumOperands(); ii != ie; ++ii) {
+ MDString *MDOption = cast<MDString>(MDOptions->getOperand(ii));
+ OS << " " << MDOption->getString();
+ }
+ }
+ }
+
+ // Globals - we only need to do this for COFF.
+ const Triple TT(_target->getTargetTriple());
+ if (!TT.isOSBinFormatCOFF())
+ return;
+ Mangler M;
+ for (const NameAndAttributes &Sym : _symbols) {
+ if (!Sym.symbol)
+ continue;
+ emitLinkerFlagsForGlobalCOFF(OS, Sym.symbol, TT, M);
+ }
+}
+
+lto::InputFile *LTOModule::createInputFile(const void *buffer,
+ size_t buffer_size, const char *path,
+ std::string &outErr) {
+ StringRef Data((const char *)buffer, buffer_size);
+ MemoryBufferRef BufferRef(Data, path);
+
+ Expected<std::unique_ptr<lto::InputFile>> ObjOrErr =
+ lto::InputFile::create(BufferRef);
+
+ if (ObjOrErr)
+ return ObjOrErr->release();
+
+ outErr = std::string(path) +
+ ": Could not read LTO input file: " + toString(ObjOrErr.takeError());
+ return nullptr;
+}
+
+size_t LTOModule::getDependentLibraryCount(lto::InputFile *input) {
+ return input->getDependentLibraries().size();
+}
+
+const char *LTOModule::getDependentLibrary(lto::InputFile *input, size_t index,
+ size_t *size) {
+ StringRef S = input->getDependentLibraries()[index];
+ *size = S.size();
+ return S.data();
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-02 08:15:56 +0000