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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef dap_typeof_h
#define dap_typeof_h
#include "typeinfo.h"
#include "types.h"
#include "serialization.h"
namespace dap {
// BasicTypeInfo is an implementation of the TypeInfo interface for the simple
// template type T.
template <typename T>
struct BasicTypeInfo : public TypeInfo {
constexpr BasicTypeInfo(std::string&& name) : name_(std::move(name)) {}
// TypeInfo compliance
inline std::string name() const override { return name_; }
inline size_t size() const override { return sizeof(T); }
inline size_t alignment() const override { return alignof(T); }
inline void construct(void* ptr) const override { new (ptr) T(); }
inline void copyConstruct(void* dst, const void* src) const override {
new (dst) T(*reinterpret_cast<const T*>(src));
}
inline void destruct(void* ptr) const override {
reinterpret_cast<T*>(ptr)->~T();
}
inline bool deserialize(const Deserializer* d, void* ptr) const override {
return d->deserialize(reinterpret_cast<T*>(ptr));
}
inline bool serialize(Serializer* s, const void* ptr) const override {
return s->serialize(*reinterpret_cast<const T*>(ptr));
}
private:
std::string name_;
};
// TypeOf has a template specialization for each DAP type, each declaring a
// const TypeInfo* type() static member function that describes type T.
template <typename T>
struct TypeOf {};
template <>
struct TypeOf<boolean> {
static const TypeInfo* type();
};
template <>
struct TypeOf<string> {
static const TypeInfo* type();
};
template <>
struct TypeOf<integer> {
static const TypeInfo* type();
};
template <>
struct TypeOf<number> {
static const TypeInfo* type();
};
template <>
struct TypeOf<object> {
static const TypeInfo* type();
};
template <>
struct TypeOf<any> {
static const TypeInfo* type();
};
template <>
struct TypeOf<null> {
static const TypeInfo* type();
};
template <typename T>
struct TypeOf<array<T>> {
static inline const TypeInfo* type() {
static auto typeinfo = TypeInfo::create<BasicTypeInfo<array<T>>>(
"array<" + TypeOf<T>::type()->name() + ">");
return typeinfo;
}
};
template <typename T0, typename... Types>
struct TypeOf<variant<T0, Types...>> {
static inline const TypeInfo* type() {
static auto typeinfo =
TypeInfo::create<BasicTypeInfo<variant<T0, Types...>>>("variant");
return typeinfo;
}
};
template <typename T>
struct TypeOf<optional<T>> {
static inline const TypeInfo* type() {
static auto typeinfo = TypeInfo::create<BasicTypeInfo<optional<T>>>(
"optional<" + TypeOf<T>::type()->name() + ">");
return typeinfo;
}
};
// DAP_OFFSETOF() macro is a generalization of the offsetof() macro defined in
// <cstddef>. It evaluates to the offset of the given field, with fewer
// restrictions than offsetof(). We cast the address '32' and subtract it again,
// because null-dereference is undefined behavior.
#define DAP_OFFSETOF(s, m) \
((int)(size_t) & reinterpret_cast<const volatile char&>((((s*)32)->m)) - 32)
// internal functionality
namespace detail {
template <class T, class M>
M member_type(M T::*);
} // namespace detail
// DAP_TYPEOF() returns the type of the struct (s) member (m).
#define DAP_TYPEOF(s, m) decltype(detail::member_type(&s::m))
// DAP_FIELD() declares a structure field for the DAP_IMPLEMENT_STRUCT_TYPEINFO
// macro.
// FIELD is the name of the struct field.
// NAME is the serialized name of the field, as described by the DAP
// specification.
#define DAP_FIELD(FIELD, NAME) \
::dap::Field { \
NAME, DAP_OFFSETOF(StructTy, FIELD), \
TypeOf<DAP_TYPEOF(StructTy, FIELD)>::type(), \
}
// DAP_DECLARE_STRUCT_TYPEINFO() declares a TypeOf<> specialization for STRUCT.
// Must be used within the 'dap' namespace.
#define DAP_DECLARE_STRUCT_TYPEINFO(STRUCT) \
template <> \
struct TypeOf<STRUCT> { \
static constexpr bool has_custom_serialization = true; \
static const TypeInfo* type(); \
static bool deserializeFields(const Deserializer*, void* obj); \
static bool serializeFields(FieldSerializer*, const void* obj); \
}
// DAP_IMPLEMENT_STRUCT_FIELD_SERIALIZATION() implements the deserializeFields()
// and serializeFields() static methods of a TypeOf<> specialization. Used
// internally by DAP_IMPLEMENT_STRUCT_TYPEINFO() and
// DAP_IMPLEMENT_STRUCT_TYPEINFO_EXT().
// You probably do not want to use this directly.
#define DAP_IMPLEMENT_STRUCT_FIELD_SERIALIZATION(STRUCT, NAME, ...) \
bool TypeOf<STRUCT>::deserializeFields(const Deserializer* fd, void* obj) { \
using StructTy = STRUCT; \
(void)sizeof(StructTy); /* avoid unused 'using' warning */ \
for (auto field : std::initializer_list<Field>{__VA_ARGS__}) { \
if (!fd->field(field.name, [&](Deserializer* d) { \
auto ptr = reinterpret_cast<uint8_t*>(obj) + field.offset; \
return field.type->deserialize(d, ptr); \
})) { \
return false; \
} \
} \
return true; \
} \
bool TypeOf<STRUCT>::serializeFields(FieldSerializer* fs, const void* obj) {\
using StructTy = STRUCT; \
(void)sizeof(StructTy); /* avoid unused 'using' warning */ \
for (auto field : std::initializer_list<Field>{__VA_ARGS__}) { \
if (!fs->field(field.name, [&](Serializer* s) { \
auto ptr = reinterpret_cast<const uint8_t*>(obj) + field.offset; \
return field.type->serialize(s, ptr); \
})) { \
return false; \
} \
} \
return true; \
}
// DAP_IMPLEMENT_STRUCT_TYPEINFO() implements the type() member function for the
// TypeOf<> specialization for STRUCT.
// STRUCT is the structure typename.
// NAME is the serialized name of the structure, as described by the DAP
// specification. The variadic (...) parameters should be a repeated list of
// DAP_FIELD()s, one for each field of the struct.
// Must be used within the 'dap' namespace.
#define DAP_IMPLEMENT_STRUCT_TYPEINFO(STRUCT, NAME, ...) \
DAP_IMPLEMENT_STRUCT_FIELD_SERIALIZATION(STRUCT, NAME, __VA_ARGS__) \
const ::dap::TypeInfo* TypeOf<STRUCT>::type() { \
struct TI : BasicTypeInfo<STRUCT> { \
TI() : BasicTypeInfo<STRUCT>(NAME) {} \
bool deserialize(const Deserializer* d, void* obj) const override { \
return deserializeFields(d, obj); \
} \
bool serialize(Serializer* s, const void* obj) const override { \
return s->object( \
[&](FieldSerializer* fs) { return serializeFields(fs, obj); }); \
} \
}; \
static TI typeinfo; \
return &typeinfo; \
}
// DAP_STRUCT_TYPEINFO() is a helper for declaring and implementing a TypeOf<>
// specialization for STRUCT in a single statement.
// Must be used within the 'dap' namespace.
#define DAP_STRUCT_TYPEINFO(STRUCT, NAME, ...) \
DAP_DECLARE_STRUCT_TYPEINFO(STRUCT); \
DAP_IMPLEMENT_STRUCT_TYPEINFO(STRUCT, NAME, __VA_ARGS__)
// DAP_IMPLEMENT_STRUCT_TYPEINFO_EXT() implements the type() member function for
// the TypeOf<> specialization for STRUCT that derives from BASE.
// STRUCT is the structure typename.
// BASE is the base structure typename.
// NAME is the serialized name of the structure, as described by the DAP
// specification. The variadic (...) parameters should be a repeated list of
// DAP_FIELD()s, one for each field of the struct.
// Must be used within the 'dap' namespace.
#define DAP_IMPLEMENT_STRUCT_TYPEINFO_EXT(STRUCT, BASE, NAME, ...) \
static_assert(std::is_base_of<BASE, STRUCT>::value, \
#STRUCT " does not derive from " #BASE); \
DAP_IMPLEMENT_STRUCT_FIELD_SERIALIZATION(STRUCT, NAME, __VA_ARGS__) \
const ::dap::TypeInfo* TypeOf<STRUCT>::type() { \
struct TI : BasicTypeInfo<STRUCT> { \
TI() : BasicTypeInfo<STRUCT>(NAME) {} \
bool deserialize(const Deserializer* d, void* obj) const override { \
auto derived = static_cast<STRUCT*>(obj); \
auto base = static_cast<BASE*>(obj); \
return TypeOf<BASE>::deserializeFields(d, base) && \
deserializeFields(d, derived); \
} \
bool serialize(Serializer* s, const void* obj) const override { \
return s->object([&](FieldSerializer* fs) { \
auto derived = static_cast<const STRUCT*>(obj); \
auto base = static_cast<const BASE*>(obj); \
return TypeOf<BASE>::serializeFields(fs, base) && \
serializeFields(fs, derived); \
}); \
} \
}; \
static TI typeinfo; \
return &typeinfo; \
}
// DAP_STRUCT_TYPEINFO_EXT() is a helper for declaring and implementing a
// TypeOf<> specialization for STRUCT that derives from BASE in a single
// statement.
// Must be used within the 'dap' namespace.
#define DAP_STRUCT_TYPEINFO_EXT(STRUCT, BASE, NAME, ...) \
DAP_DECLARE_STRUCT_TYPEINFO(STRUCT); \
DAP_IMPLEMENT_STRUCT_TYPEINFO_EXT(STRUCT, BASE, NAME, __VA_ARGS__)
} // namespace dap
#endif // dap_typeof_h
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