C++ DynamicLibrary::isValid方法代码示例

extern "C" LLVMBool LLVMRustLoadDynamicLibrary(const char *path)
{
    std::string err;
    DynamicLibrary lib = DynamicLibrary::getPermanentLibrary(path, &err);

    if (!lib.isValid())
        LLVMRustSetLastError(err.c_str());

    return lib.isValid();
}

TEST(DynamicLibrary, Overload) {
  {
    std::string Err;
    llvm_shutdown_obj Shutdown;
    DynamicLibrary DL =
        DynamicLibrary::getPermanentLibrary(LibPath().c_str(), &Err);
    EXPECT_TRUE(DL.isValid());
    EXPECT_TRUE(Err.empty());

    GetString GS = FuncPtr<GetString>(DL.getAddressOfSymbol("TestA"));
    EXPECT_TRUE(GS != nullptr && GS != &TestA);
    EXPECT_EQ(StdString(GS()), "LibCall");

    GS = FuncPtr<GetString>(DynamicLibrary::SearchForAddressOfSymbol("TestA"));
    EXPECT_TRUE(GS != nullptr && GS != &TestA);
    EXPECT_EQ(StdString(GS()), "LibCall");

    DL = DynamicLibrary::getPermanentLibrary(nullptr, &Err);
    EXPECT_TRUE(DL.isValid());
    EXPECT_TRUE(Err.empty());

    // Test overloading local symbols does not occur by default
    GS = FuncPtr<GetString>(DynamicLibrary::SearchForAddressOfSymbol("TestA"));
    EXPECT_TRUE(GS != nullptr && GS == &TestA);
    EXPECT_EQ(StdString(GS()), "ProcessCall");

    GS = FuncPtr<GetString>(DL.getAddressOfSymbol("TestA"));
    EXPECT_TRUE(GS != nullptr && GS == &TestA);
    EXPECT_EQ(StdString(GS()), "ProcessCall");

    // Test overloading by forcing library priority when searching for a symbol
    DynamicLibrary::SearchOrder = DynamicLibrary::SO_LoadedFirst;
    GS = FuncPtr<GetString>(DynamicLibrary::SearchForAddressOfSymbol("TestA"));
    EXPECT_TRUE(GS != nullptr && GS != &TestA);
    EXPECT_EQ(StdString(GS()), "LibCall");

    DynamicLibrary::AddSymbol("TestA", PtrFunc(&OverloadTestA));
    GS = FuncPtr<GetString>(DL.getAddressOfSymbol("TestA"));
    EXPECT_TRUE(GS != nullptr && GS != &OverloadTestA);

    GS = FuncPtr<GetString>(DynamicLibrary::SearchForAddressOfSymbol("TestA"));
    EXPECT_TRUE(GS != nullptr && GS == &OverloadTestA);
    EXPECT_EQ(StdString(GS()), "OverloadCall");
  }
  EXPECT_TRUE(FuncPtr<GetString>(DynamicLibrary::SearchForAddressOfSymbol(
                  "TestA")) == nullptr);

  // Check serach ordering is reset to default after call to llvm_shutdown
  EXPECT_TRUE(DynamicLibrary::SearchOrder == DynamicLibrary::SO_Linker);
}

TEST(DynamicLibrary, Unsupported) {
  std::string Err;
  DynamicLibrary DL =
      DynamicLibrary::getPermanentLibrary(LibPath().c_str(), &Err);
  EXPECT_FALSE(DL.isValid());
  EXPECT_EQ(Err, "dlopen() not supported on this platform");
}

ClangCheckerRegistry::ClangCheckerRegistry(ArrayRef<std::string> plugins,
                                           DiagnosticsEngine *diags) {
  registerBuiltinCheckers(*this);

  for (ArrayRef<std::string>::iterator i = plugins.begin(), e = plugins.end();
       i != e; ++i) {
    // Get access to the plugin.
    std::string err;
    DynamicLibrary lib = DynamicLibrary::getPermanentLibrary(i->c_str(), &err);
    if (!lib.isValid()) {
      diags->Report(diag::err_fe_unable_to_load_plugin) << *i << err;
      continue;
    }

    // See if it's compatible with this build of clang.
    const char *pluginAPIVersion =
      (const char *) lib.getAddressOfSymbol("clang_analyzerAPIVersionString");
    if (!isCompatibleAPIVersion(pluginAPIVersion)) {
      warnIncompatible(diags, *i, pluginAPIVersion);
      continue;
    }

    // Register its checkers.
    RegisterCheckersFn registerPluginCheckers =
      (RegisterCheckersFn) (intptr_t) lib.getAddressOfSymbol(
                                                      "clang_registerCheckers");
    if (registerPluginCheckers)
      registerPluginCheckers(*this);
  }
}

TEST(DynamicLibrary, Shutdown) {
  std::string A("PipSqueak"), B, C("SecondLib");
  std::vector<std::string> Order;
  {
    std::string Err;
    llvm_shutdown_obj Shutdown;
    DynamicLibrary DL =
        DynamicLibrary::getPermanentLibrary(LibPath(A).c_str(), &Err);
    EXPECT_TRUE(DL.isValid());
    EXPECT_TRUE(Err.empty());

    SetStrings SS_0 = FuncPtr<SetStrings>(
        DynamicLibrary::SearchForAddressOfSymbol("SetStrings"));
    EXPECT_TRUE(SS_0 != nullptr);

    SS_0(A, B);
    EXPECT_EQ(B, "Local::Local(PipSqueak)");

    TestOrder TO_0 = FuncPtr<TestOrder>(
        DynamicLibrary::SearchForAddressOfSymbol("TestOrder"));
    EXPECT_TRUE(TO_0 != nullptr);
    
    DynamicLibrary DL2 =
        DynamicLibrary::getPermanentLibrary(LibPath(C).c_str(), &Err);
    EXPECT_TRUE(DL2.isValid());
    EXPECT_TRUE(Err.empty());

    // Should find latest version of symbols in SecondLib
    SetStrings SS_1 = FuncPtr<SetStrings>(
        DynamicLibrary::SearchForAddressOfSymbol("SetStrings"));
    EXPECT_TRUE(SS_1 != nullptr);
    EXPECT_TRUE(SS_0 != SS_1);

    TestOrder TO_1 = FuncPtr<TestOrder>(
        DynamicLibrary::SearchForAddressOfSymbol("TestOrder"));
    EXPECT_TRUE(TO_1 != nullptr);
    EXPECT_TRUE(TO_0 != TO_1);

    B.clear();
    SS_1(C, B);
    EXPECT_EQ(B, "Local::Local(SecondLib)");

    TO_0(Order);
    TO_1(Order);
  }
  EXPECT_EQ(A, "Global::~Global");
  EXPECT_EQ(B, "Local::~Local");
  EXPECT_TRUE(FuncPtr<SetStrings>(DynamicLibrary::SearchForAddressOfSymbol(
                  "SetStrings")) == nullptr);

  // Test unload/destruction ordering
  EXPECT_EQ(Order.size(), 2UL);
  EXPECT_EQ(Order.front(), "SecondLib");
  EXPECT_EQ(Order.back(), "PipSqueak");
}

bool RustMCJITMemoryManager::loadCrate(const char* file, std::string* err) {
  DynamicLibrary crate = DynamicLibrary::getPermanentLibrary(file,
                                                             err);

  if(crate.isValid()) {
    crates.insert(&crate);

    return true;
  }

  return false;
}

void test_desobj()
{
    ErrorOr<ObjectFile *> objfile = ObjectFile::createObjectFile("/usr/lib/libQtCore.so");
    ObjectFile *pobj = objfile.get();

    qDebug()<<"heheho"<<pobj->getFileFormatName().data();
    int i = 0;

    DynamicLibrary dlib = DynamicLibrary::getPermanentLibrary("/usr/lib/libQt5Core.so");
    qDebug()<<dlib.isValid();
    void *addr = dlib.SearchForAddressOfSymbol("_ZN7QString4chopEi");
    qDebug()<<"addr:"<<addr;
}