+static std::unique_ptr<Module> loadFile(const char *argv0,
+ const std::string &FN,
+ LLVMContext &Context,
+ bool MaterializeMetadata = true) {
+ SMDiagnostic Err;
+ if (Verbose) errs() << "Loading '" << FN << "'\n";
+ std::unique_ptr<Module> Result =
+ getLazyIRFileModule(FN, Err, Context, !MaterializeMetadata);
+ if (!Result)
+ Err.print(argv0, errs());
+
+ if (MaterializeMetadata) {
+ Result->materializeMetadata();
+ UpgradeDebugInfo(*Result);
+ }
+
+ return Result;
+}
+
+static void diagnosticHandler(const DiagnosticInfo &DI) {
+ unsigned Severity = DI.getSeverity();
+ switch (Severity) {
+ case DS_Error:
+ errs() << "ERROR: ";
+ break;
+ case DS_Warning:
+ if (SuppressWarnings)
+ return;
+ errs() << "WARNING: ";
+ break;
+ case DS_Remark:
+ case DS_Note:
+ llvm_unreachable("Only expecting warnings and errors");
+ }
+
+ DiagnosticPrinterRawOStream DP(errs());
+ DI.print(DP);
+ errs() << '\n';
+}
+
+static void diagnosticHandlerWithContext(const DiagnosticInfo &DI, void *C) {
+ diagnosticHandler(DI);
+}
+
+/// Import any functions requested via the -import option.
+static bool importFunctions(const char *argv0, LLVMContext &Context,
+ Linker &L) {
+ StringMap<std::unique_ptr<DenseMap<unsigned, MDNode *>>>
+ ModuleToTempMDValsMap;
+ for (const auto &Import : Imports) {
+ // Identify the requested function and its bitcode source file.
+ size_t Idx = Import.find(':');
+ if (Idx == std::string::npos) {
+ errs() << "Import parameter bad format: " << Import << "\n";
+ return false;
+ }
+ std::string FunctionName = Import.substr(0, Idx);
+ std::string FileName = Import.substr(Idx + 1, std::string::npos);
+
+ // Load the specified source module.
+ std::unique_ptr<Module> M = loadFile(argv0, FileName, Context, false);
+ if (!M.get()) {
+ errs() << argv0 << ": error loading file '" << FileName << "'\n";
+ return false;
+ }
+
+ if (verifyModule(*M, &errs())) {
+ errs() << argv0 << ": " << FileName
+ << ": error: input module is broken!\n";
+ return false;
+ }
+
+ Function *F = M->getFunction(FunctionName);
+ if (!F) {
+ errs() << "Ignoring import request for non-existent function "
+ << FunctionName << " from " << FileName << "\n";
+ continue;
+ }
+ // We cannot import weak_any functions without possibly affecting the
+ // order they are seen and selected by the linker, changing program
+ // semantics.
+ if (F->hasWeakAnyLinkage()) {
+ errs() << "Ignoring import request for weak-any function " << FunctionName
+ << " from " << FileName << "\n";
+ continue;
+ }
+
+ if (Verbose)
+ errs() << "Importing " << FunctionName << " from " << FileName << "\n";
+
+ std::unique_ptr<FunctionInfoIndex> Index;
+ if (!FunctionIndex.empty()) {
+ ErrorOr<std::unique_ptr<FunctionInfoIndex>> IndexOrErr =
+ llvm::getFunctionIndexForFile(FunctionIndex, diagnosticHandler);
+ std::error_code EC = IndexOrErr.getError();
+ if (EC) {
+ errs() << EC.message() << '\n';
+ return false;
+ }
+ Index = std::move(IndexOrErr.get());
+ }
+
+ // Save the mapping of value ids to temporary metadata created when
+ // importing this function. If we have already imported from this module,
+ // add new temporary metadata to the existing mapping.
+ auto &TempMDVals = ModuleToTempMDValsMap[FileName];
+ if (!TempMDVals)
+ TempMDVals = llvm::make_unique<DenseMap<unsigned, MDNode *>>();
+
+ // Link in the specified function.
+ DenseSet<const GlobalValue *> FunctionsToImport;
+ FunctionsToImport.insert(F);
+ if (L.linkInModule(std::move(M), Linker::Flags::None, Index.get(),
+ &FunctionsToImport, TempMDVals.get()))
+ return false;