Clang plugin to check that unstable types are not used in IPC.

tools/clang/plugins/tests/ipc.cpp

+// Copyright (c) 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Blacklisted typedefs
+typedef __INTMAX_TYPE__ intmax_t;
+typedef __UINTMAX_TYPE__ uintmax_t;
+typedef int intptr_t;
+typedef unsigned int uintptr_t;
+typedef __WINT_TYPE__ wint_t;
+typedef __SIZE_TYPE__ size_t;
+typedef __SIZE_TYPE__ rsize_t;
+typedef long ssize_t;
+typedef __PTRDIFF_TYPE__ ptrdiff_t;
+typedef unsigned int dev_t;
+typedef int off_t;
+typedef long clock_t;
+typedef int time_t;
+typedef long suseconds_t;
+
+// Other typedefs
+typedef int int32_t;
+typedef unsigned int uint32_t;
+typedef long int64_t;
+typedef unsigned long uint64_t;
+
+namespace std {
+  template <class T>
+  struct allocator {};
+
+  template <class T, class A = allocator<T>>
+  struct vector {
+    T value;
+  };
+
+  template <class F, class S>
+  struct pair {};
+}
+
+namespace base {
+  class Pickle {};
+
+  template <class T, class... Ts>
+  struct Tuple {
+    T value;
+  };
+}
+
+namespace IPC {
+  template <class... T>
+  struct CheckedTuple {
+    typedef base::Tuple<T...> Tuple;
+  };
+
+  template <class T>
+  struct ParamTraits {
+    static void Write(base::Pickle*, const T&) {}
+  };
+
+  template <class T>
+  void WriteParam(base::Pickle* pickle, const T& value) {
+    ParamTraits<T>::Write(pickle, value);
+  }
+}
+
+#if 1
+
+/* Test IPC::WriteParam() usage in templates. ERRORS: 6 */
+
+struct Data {
+  uint32_t value;
+};
+
+template <>
+struct IPC::ParamTraits<Data> {
+  static void Write(base::Pickle* pickle, const Data& p) {
+    // OK: WriteParam() called in explicit specialization
+    WriteParam(pickle, p.value); // OK
+  }
+};
+
+template <class T>
+struct Container {
+  T value;
+};
+
+template <class T>
+struct IPC::ParamTraits<Container<T>> {
+  static void Write(base::Pickle* pickle, const Container<T>& container) {
+    // ERROR: T is not explicitly referenced
+    IPC::WriteParam(pickle, container.value); // ERROR
+    WriteParam(pickle, container.value); // ERROR
+
+    // OK: T explicitly referenced
+    IPC::WriteParam<T>(pickle, container.value); // OK
+    WriteParam<T>(pickle, container.value); // OK
+
+    // OK: explicit cast to non-dependent allowed type
+    WriteParam(pickle, static_cast<uint32_t>(container.value)); // OK
+
+    // ERROR: explicit cast to non-dependent banned type
+    WriteParam(pickle, static_cast<long>(container.value)); // ERROR
+  }
+};
+
+template <class T, class... Ts>
+struct MultiContainer {
+  T value;
+};
+
+template <class T, class... Ts>
+struct IPC::ParamTraits<MultiContainer<T, Ts...>> {
+  static void Write(base::Pickle* pickle,
+                    const MultiContainer<T, Ts...>& container) {
+    // OK: template argument explicitly referenced
+    bool helper[] = {(WriteParam<Ts>(pickle, container.value), true)...}; // OK
+    (void)helper;
+  }
+};
+
+template <class T>
+struct SomeClass {
+  static void Write(base::Pickle* pickle) {
+    // ERROR: WriteParam() can only be used in ParamTraits templates
+    T p;
+    IPC::WriteParam(pickle, p); // ERROR
+  }
+};
+
+template <class T>
+void SomeWriteFunction(base::Pickle* pickle) {
+  // ERROR: WriteParam() can only be used in ParamTraits templates
+  T p;
+  IPC::WriteParam(pickle, p); // ERROR
+  [&](){
+    IPC::WriteParam(pickle, p); // ERROR
+  }();
+}
+
+void TestWriteParamInTemplates() {
+  SomeClass<int>::Write(nullptr);
+  SomeWriteFunction<uint32_t>(nullptr);
+}
+
+#endif
+
+#if 1
+
+/* Test IPC::CheckedTuple. ERRORS: 4 */
+
+#define IPC_TUPLE(...) IPC::CheckedTuple<__VA_ARGS__>::Tuple
+
+#define IPC_MESSAGE_DECL(name, id, in_tuple) \
+  struct name ## Meta_ ## id { \
+    using InTuple = in_tuple; \
+  };
+
+#define IPC_TEST_MESSAGE(id, in) \
+  IPC_MESSAGE_DECL(TestMessage, id, IPC_TUPLE in)
+
+struct Empty {};
+
+IPC_TEST_MESSAGE(__COUNTER__, (bool, size_t, Empty, long)) // 2 ERRORs
+
+typedef std::vector<long> long1D;
+typedef std::vector<long1D> long2D;
+IPC_TEST_MESSAGE(__COUNTER__, (bool, long2D)) // ERROR
+
+IPC_TEST_MESSAGE(__COUNTER__, (char, short, std::pair<size_t, bool>)) // ERROR
+
+#endif
+
+#if 1
+
+/* Check IPC::WriteParam() arguments. ERRORS: 26 */
+
+void TestWriteParamArgument() {
+  #define CALL_WRITEPARAM(Type) \
+    { \
+      Type p = 0; \
+      IPC::WriteParam(nullptr, p); \
+    }
+
+  // ERROR: blacklisted types / typedefs
+  CALL_WRITEPARAM(long) // ERROR
+  CALL_WRITEPARAM(unsigned long) // ERROR
+  CALL_WRITEPARAM(intmax_t) // ERROR
+  CALL_WRITEPARAM(uintmax_t) // ERROR
+  CALL_WRITEPARAM(intptr_t) // ERROR
+  CALL_WRITEPARAM(uintptr_t) // ERROR
+  CALL_WRITEPARAM(wint_t) // ERROR
+  CALL_WRITEPARAM(size_t) // ERROR
+  CALL_WRITEPARAM(rsize_t) // ERROR
+  CALL_WRITEPARAM(ssize_t) // ERROR
+  CALL_WRITEPARAM(ptrdiff_t) // ERROR
+  CALL_WRITEPARAM(dev_t) // ERROR
+  CALL_WRITEPARAM(off_t) // ERROR
+  CALL_WRITEPARAM(clock_t) // ERROR
+  CALL_WRITEPARAM(time_t) // ERROR
+  CALL_WRITEPARAM(suseconds_t) // ERROR
+
+  // ERROR: typedef to blacklisted typedef
+  typedef size_t my_size;
+  CALL_WRITEPARAM(my_size) // ERROR
+
+  // ERROR: expression ends up with type "unsigned long"
+  {
+    uint64_t p = 0;
+    IPC::WriteParam(nullptr, p + 1); // ERROR
+  }
+
+  // ERROR: long chain of typedefs, ends up with blacklisted typedef
+  {
+    typedef size_t my_size_base;
+    typedef const my_size_base my_size;
+    typedef my_size& my_size_ref;
+    my_size_ref p = 0;
+    IPC::WriteParam(nullptr, p); // ERROR
+  }
+
+  // OK: typedef to blacklisted type
+  typedef long my_long;
+  CALL_WRITEPARAM(my_long) // OK
+
+  // OK: other types / typedefs
+  CALL_WRITEPARAM(char) // OK
+  CALL_WRITEPARAM(int) // OK
+  CALL_WRITEPARAM(uint32_t) // OK
+  CALL_WRITEPARAM(int64_t) // OK
+
+  // OK: long chain of typedefs, ends up with non-blacklisted typedef
+  {
+    typedef uint32_t my_int_base;
+    typedef const my_int_base my_int;
+    typedef my_int& my_int_ref;
+    my_int_ref p = 0;
+    IPC::WriteParam(nullptr, p); // OK
+  }
+
+  #undef CALL_WRITEPARAM
+}
+
+struct Provider {
+  typedef unsigned int flags;
+
+  short get_short() const { return 0; }
+  uint64_t get_uint64() const { return 0; }
+  long get_long() const { return 0; }
+  unsigned int get_uint() const { return 0; }
+  flags get_flags() const { return 0; }
+  size_t get_size() const { return 0; }
+
+  template <class T>
+  T get() const { return 0; }
+
+  short short_data;
+  unsigned int uint_data;
+  flags flags_data;
+  long long_data;
+  size_t size_data;
+  uint64_t uint64_data;
+};
+
+void TestWriteParamMemberArgument() {
+  Provider p;
+
+  IPC::WriteParam(nullptr, p.get<short>()); // OK
+  IPC::WriteParam(nullptr, p.get_short()); // OK
+  IPC::WriteParam(nullptr, p.short_data); // OK
+
+  IPC::WriteParam(nullptr, p.get<unsigned int>()); // OK
+  IPC::WriteParam(nullptr, p.get_uint()); // OK
+  IPC::WriteParam(nullptr, p.uint_data); // OK
+
+  IPC::WriteParam(nullptr, p.get<Provider::flags>()); // OK
+  IPC::WriteParam(nullptr, p.get_flags()); // OK
+  IPC::WriteParam(nullptr, p.flags_data); // OK
+
+  IPC::WriteParam(nullptr, p.get<long>()); // ERROR
+  IPC::WriteParam(nullptr, p.get_long()); // ERROR
+  IPC::WriteParam(nullptr, p.long_data); // ERROR
+
+  IPC::WriteParam(nullptr, p.get<size_t>()); // ERROR
+  IPC::WriteParam(nullptr, p.get_size()); // ERROR
+  IPC::WriteParam(nullptr, p.size_data); // ERROR
+
+  // uint64_t is unsigned long, which is blacklisted. Plugin only sees
+  // "unsigned long", and not uint64_t.
+  IPC::WriteParam(nullptr, p.get<uint64_t>()); // ERROR
+  IPC::WriteParam(nullptr, p.get_uint64()); // OK
+  IPC::WriteParam(nullptr, p.uint64_data); // OK
+}
+
+#endif
+
+/* ERRORS: 36 */