ipc/param_traits_macros.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef IPC_PARAM_TRAITS_MACROS_H_
   6 #define IPC_PARAM_TRAITS_MACROS_H_
   7
   8 #include <string>
   9
  10 // Traits generation for structs.
  11 #define IPC_STRUCT_TRAITS_BEGIN(struct_name) \
  12   namespace IPC { \
  13     template <> \
  14     struct IPC_MESSAGE_EXPORT ParamTraits<struct_name> { \
  15       typedef struct_name param_type; \
  16       static void Write(Message* m, const param_type& p); \
  17       static bool Read(const Message* m, PickleIterator* iter, param_type* p); \
  18       static void Log(const param_type& p, std::string* l); \
  19     }; \
  20   }
  21
  22 #define IPC_STRUCT_TRAITS_MEMBER(name)
  23 #define IPC_STRUCT_TRAITS_PARENT(type)
  24 #define IPC_STRUCT_TRAITS_END()
  25
  26 // Convenience macro for defining enumerated type traits for types which are
  27 // not range-checked by the IPC system. The author of the message handlers
  28 // is responsible for all validation. This macro should not need to be
  29 // subsequently redefined.
  30 #define IPC_ENUM_TRAITS(type) \
  31   IPC_ENUM_TRAITS_VALIDATE(type, true)
  32
  33 // Convenience macro for defining enumerated type traits for types which are
  34 // range-checked by the IPC system to be in the range of 0..maxvalue inclusive.
  35 // This macro should not need to be subsequently redefined.
  36 #define IPC_ENUM_TRAITS_MAX_VALUE(type, maxvalue) \
  37   IPC_ENUM_TRAITS_MIN_MAX_VALUE(type, 0, maxvalue)
  38
  39 // Convenience macro for defining enumerated type traits for types which are
  40 // range-checked by the IPC system to be in the range of minvalue..maxvalue
  41 // inclusive. This macro should not need to be subsequently redefined.
  42 // TODO(tsepez): Cast to std::underlying_type<>::type once that is permitted.
  43 #define IPC_ENUM_TRAITS_MIN_MAX_VALUE(type, minvalue, maxvalue)  \
  44   IPC_ENUM_TRAITS_VALIDATE( \
  45       type, (static_cast<int>(value) >= static_cast<int>(minvalue) && \
  46              static_cast<int>(value) <= static_cast<int>(maxvalue)))
  47
  48 // Traits generation for enums. This macro may be redefined later.
  49 #define IPC_ENUM_TRAITS_VALIDATE(enum_name, validation_expression) \
  50   namespace IPC { \
  51     template <> \
  52     struct IPC_MESSAGE_EXPORT ParamTraits<enum_name> { \
  53       typedef enum_name param_type; \
  54       static void Write(Message* m, const param_type& p); \
  55       static bool Read(const Message* m, PickleIterator* iter, param_type* p); \
  56       static void Log(const param_type& p, std::string* l); \
  57     }; \
  58   }
  59
  60 #endif  // IPC_PARAM_TRAITS_MACROS_H_
  61