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2017-04-20 21:43 GMT+08:00 via cfe-dev <cfe-dev at lists.llvm.org>:
> Hello LLVM-World,
>
> I was following the "Building a JIT in LLVM"-Tutorial and tried
to load a
> normal main. My code is the following:
> class Jitter
> {
> private:
> std::unique_ptr<TargetMachine> TM;
> const DataLayout DL;
> ObjectLinkingLayer<> ObjectLayer;
> IRCompileLayer<decltype(ObjectLayer)> CompileLayer;
>
> public:
> typedef decltype(CompileLayer)::ModuleSetHandleT ModuleHandle;
>
> Jitter() : TM(EngineBuilder().selectTarget()), DL(TM->
> createDataLayout()),
> CompileLayer(ObjectLayer, SimpleCompiler(*TM))
> {printf("!");
> llvm::sys::DynamicLibrary::LoadLibraryPermanently(nullptr);
> }
>
> TargetMachine &getTargetMachine() { return *TM; }
>
> ModuleHandle addModule(std::unique_ptr<Module> &&M) {
> // Build our symbol resolver:
> // Lambda 1: Look back into the JIT itself to find symbols that are
> part of
> // the same "logical dylib".
> // Lambda 2: Search for external symbols in the host process.
> auto Resolver = createLambdaResolver(
> [&](const std::string &Name)
> {
> printf("FLUSH :0\n");
>
> if (auto Sym = CompileLayer.findSymbol(Name, false))
> return Sym;
> return JITSymbol(nullptr);
> },
> [](const std::string &S)
> {
> printf("PLUSH :0\n");
>
> if (auto SymAddr >
RTDyldMemoryManager::getSymbolAddressInProcess(S))
> return JITSymbol(SymAddr, JITSymbolFlags::Exported);
> return JITSymbol(nullptr);
> });
>
> // Build a singleton module set to hold our module.
> std::vector<std::unique_ptr<Module>> Ms;
> Ms.push_back(std::move(M));
>
> // Add the set to the JIT with the resolver we created above and a newly
> // created SectionMemoryManager.
> return CompileLayer.addModuleSet(std::move(Ms),
>
make_unique<SectionMemoryManager>(),
> std::move(Resolver));
> }
>
> JITSymbol findSymbol(const std::string Name) {
> std::string MangledName;
> raw_string_ostream MangledNameStream(MangledName);
> Mangler::getNameWithPrefix(MangledNameStream, Name, DL);
> printf("Tzearch for: %s\n\n", MangledNameStream.str());
> return CompileLayer.findSymbol(MangledNameStream.str(), false);
> }
>
> void removeModule(ModuleHandle H) {
> CompileLayer.removeModuleSet(H);
> }
>
> };
>
> And calling from main with:
>
> int main()
> {
> llvm::InitializeNativeTarget();
> llvm::InitializeNativeTargetAsmPrinter();
> llvm::InitializeNativeTargetAsmParser();
>
> llvm::LLVMContext context;
> llvm::SMDiagnostic dia;
>
> std::unique_ptr<llvm::Module> M =
llvm::parseIRFile("./jit_main.
> ll", dia, context);
> Jitter jit;
> printf("Wuff?");
> Jitter::ModuleHandle h = jit.addModule(std::move(M));
> printf("KNUFF!\n");
>
> printf("Kuchen! 0x%p\n",
jit.findSymbol("main").getAddress());
>
> system("PAUSE");
> return 0;
> }
> The Code runs without a fail, but when the programm tries to resolve
> "main" the address is 0. The strange thing: the printf
"FLUSH :0\n" and "PLUSH
> :0\n" are never called, so did the code never compiled? What I'm
doing
> wrong?
>
> Kind regards
> Björn
> Als GmbH eingetragen im Handelsregister Bad Homburg v.d.H. HRB 9816,
> USt.ID-Nr. DE 114 165 789
> Geschäftsführer: Hiroshi Kawamura, Dr Hiroshi Nakamura, Markus Bode, Heiko
> Lampert, Takashi Nagano, Takeshi Fukushima.
> _______________________________________________
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> cfe-dev at lists.llvm.org
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>
>
--
Wei-Ren Chen (陳韋任)
Homepage: https://people.cs.nctu.edu.tw/~chenwj
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