1 // Copyright 2013 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 MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_INTERNAL_H_ 6 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_INTERNAL_H_ 7 8 #include "mojo/public/cpp/bindings/lib/template_util.h" 9 #include "mojo/public/cpp/system/core.h" 10 11 namespace mojo { 12 class String; 13 14 namespace internal { 15 template <typename T> class Array_Data; 16 17 #pragma pack(push, 1) 18 19 struct StructHeader { 20 uint32_t num_bytes; 21 uint32_t num_fields; 22 }; 23 MOJO_COMPILE_ASSERT(sizeof(StructHeader) == 8, bad_sizeof_StructHeader); 24 25 struct ArrayHeader { 26 uint32_t num_bytes; 27 uint32_t num_elements; 28 }; 29 MOJO_COMPILE_ASSERT(sizeof(ArrayHeader) == 8, bad_sizeof_ArrayHeader); 30 31 template <typename T> 32 union StructPointer { 33 uint64_t offset; 34 T* ptr; 35 }; 36 MOJO_COMPILE_ASSERT(sizeof(StructPointer<char>) == 8, bad_sizeof_StructPointer); 37 38 template <typename T> 39 union ArrayPointer { 40 uint64_t offset; 41 Array_Data<T>* ptr; 42 }; 43 MOJO_COMPILE_ASSERT(sizeof(ArrayPointer<char>) == 8, bad_sizeof_ArrayPointer); 44 45 union StringPointer { 46 uint64_t offset; 47 Array_Data<char>* ptr; 48 }; 49 MOJO_COMPILE_ASSERT(sizeof(StringPointer) == 8, bad_sizeof_StringPointer); 50 51 #pragma pack(pop) 52 53 template <typename T> 54 void ResetIfNonNull(T* ptr) { 55 if (ptr) 56 *ptr = T(); 57 } 58 59 template <typename T> 60 T FetchAndReset(T* ptr) { 61 T temp = *ptr; 62 *ptr = T(); 63 return temp; 64 } 65 66 template <typename H> struct IsHandle { 67 enum { value = IsBaseOf<Handle, H>::value }; 68 }; 69 70 template <typename T, bool move_only = IsMoveOnlyType<T>::value> 71 struct WrapperTraits; 72 73 template <typename T> struct WrapperTraits<T, false> { 74 typedef T DataType; 75 }; 76 template <typename H> struct WrapperTraits<ScopedHandleBase<H>, true> { 77 typedef H DataType; 78 }; 79 template <typename S> struct WrapperTraits<S, true> { 80 typedef typename S::Data_* DataType; 81 }; 82 83 } // namespace internal 84 } // namespace mojo 85 86 #endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_INTERNAL_H_ 87
