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xo-reflect: + EstablishFunctionTdx + bugfix deducing fptr inputs

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This commit is contained in:
Roland Conybeare 2024-06-15 13:15:57 -04:00
commit 515cedf160
5 changed files with 133 additions and 18 deletions
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110
include/xo/reflect/Reflect.hpp
View file

@ -72,16 +72,38 @@ namespace xo {
// ----- Retval (*)(A1 .. An) -----
template<typename Retval, typename... Args>
class EstablishTdx<Retval(*)(Args...)> {
class EstablishTdx<Retval (*)(Args...)> {
public:
/* definition provided after decl for Reflect {} below */
static std::unique_ptr<TypeDescrExtra> make();
};
// ----- Retval (*)() -----
// ----- Retval (*)(A1 .. An) noexcept -----
template <typename Retval>
class EstablishTdx<Retval(*)()> {
template<typename Retval, typename... Args>
class EstablishTdx<Retval (*)(Args...) noexcept> {
public:
/* definition provided after decl for Reflect {} below */
static std::unique_ptr<TypeDescrExtra> make();
};
// ----- EstasblishFunctionTdx -------------------------------------
template <typename T>
class EstablishFunctionTdx;
// ----- Retval (*)(A1 .. An) -----
template<typename Retval, typename... Args>
class EstablishFunctionTdx<Retval (*)(Args...)> {
public:
/* definition provided after decl for Reflect {} below */
static std::unique_ptr<TypeDescrExtra> make();
};
template<typename Retval, typename... Args>
class EstablishFunctionTdx<Retval (*)(Args...) noexcept> {
public:
/* definition provided after decl for Reflect {} below */
static std::unique_ptr<TypeDescrExtra> make();
};
@ -170,6 +192,41 @@ namespace xo {
return retval_td;
} /*require*/
/* can optionally use this when reflecting a function pointer.
* Should get the same result as reflect<T>(),
* but will not fallback to AtomicTdx if T is not recognized as a function pointer
*/
template <typename T>
static TypeDescrW require_function() {
//static_assert(std::is_function_v<T>);
TypeDescrW retval_td = EstablishTypeDescr::establish<T>();
/* mark TypeDescr for T as complete (even though it isn't quite yet),
* so that when we encounter recursive types, reflection terminates.
* For example consider type resulting from code like
*
* typename T;
* using T = std::vector<T *>;
*
*/
if (retval_td->mark_complete()) {
/* control here on 2nd+later calls to require<T>().
* in principle can immediately short-circuit.
*/
} else {
/* control comes here the first time require<T>() runs */
auto final_tdx = EstablishFunctionTdx<T>::make();
retval_td->assign_tdextra(std::move(final_tdx));
/* also need to require for each child */
}
return retval_td;
}
/* Use:
* T * xyz = ...;
* TaggedPtr xyz_tp = Reflect::make_tp(xyz);
@ -256,7 +313,7 @@ namespace xo {
return StructTdx::pair<Lhs, Rhs>();
} /*make*/
// ----- Retval (*) (A1 .. An) -----
// ----- Retval(A1 .. An) -----
namespace detail {
/** @class AssembleArgv
@ -272,7 +329,7 @@ namespace xo {
template <>
struct AssembleArgv<> {
static void append_argv(std::vector<TypeDescr> * p_v) {}
static void append_argv(std::vector<TypeDescr> * /*p_v*/) {}
};
template <typename Arg, typename... Rest>
@ -284,6 +341,28 @@ namespace xo {
};
} /*detail*/
template <typename Retval, typename... Args>
std::unique_ptr<TypeDescrExtra>
EstablishFunctionTdx<Retval (*)(Args...)>::make() {
std::vector<TypeDescr> argv;
detail::AssembleArgv<Args...>::append_argv(&argv);
return FunctionTdx::make_function(Reflect::require<Retval>(),
std::move(argv),
false /*!is_noexcept*/);
}
template <typename Retval, typename... Args>
std::unique_ptr<TypeDescrExtra>
EstablishFunctionTdx<Retval (*)(Args...) noexcept>::make() {
std::vector<TypeDescr> argv;
detail::AssembleArgv<Args...>::append_argv(&argv);
return FunctionTdx::make_function(Reflect::require<Retval>(),
std::move(argv),
true /*is_noexcept*/);
}
/* declared above before
* class Reflect { ... }
*/
@ -293,8 +372,25 @@ namespace xo {
std::vector<TypeDescr> argv;
detail::AssembleArgv<Args...>::append_argv(&argv);
return FunctionTdx::make_function(Reflect::require<Retval>(), std::move(argv));
return FunctionTdx::make_function(Reflect::require<Retval>(),
std::move(argv),
false /*!is_noexcept*/);
}
/* declared above before
* class Reflect { ... }
*/
template <typename Retval, typename... Args>
std::unique_ptr<TypeDescrExtra>
EstablishTdx<Retval (*)(Args...) noexcept>::make() {
std::vector<TypeDescr> argv;
detail::AssembleArgv<Args...>::append_argv(&argv);
return FunctionTdx::make_function(Reflect::require<Retval>(),
std::move(argv),
true /*is_noexcept*/);
}
} /*namespace reflect*/
} /*namespace xo*/

1
include/xo/reflect/TypeDescr.hpp
View file

@ -226,6 +226,7 @@ namespace xo {
*/
TypeDescr fn_retval() const { return this->tdextra_->fn_retval(); }
TypeDescr fn_arg(uint32_t i) const { return this->tdextra_->fn_arg(i); }
bool fn_is_noexcept() const { return this->tdextra_->fn_is_noexcept(); }
void display(std::ostream & os) const;
std::string display_string() const;

3
include/xo/reflect/TypeDescrExtra.hpp
View file

@ -67,9 +67,10 @@ namespace xo {
*
* @pre @ref TypeDescrExtra::is_function() is true
**/
virtual uint32_t n_fn_arg() const { return 0; }
virtual const TypeDescrBase * fn_retval() const { return nullptr; }
virtual uint32_t n_fn_arg() const { return 0; }
virtual const TypeDescrBase * fn_arg(uint32_t /*i_arg*/) const { return nullptr; }
virtual bool fn_is_noexcept() const { return false; }
}; /*TypeDescrExtra*/
} /*namespace reflect*/
} /*namespace xo*/

18
include/xo/reflect/function/FunctionTdx.hpp
View file

@ -15,11 +15,15 @@ namespace xo {
public:
virtual ~FunctionTdx() = default;
/** create instance. Will be invoked exactly once for each reflected function type **/
/** create instance. Will be invoked exactly once for each reflected function type
*
* @param retval_td. type description for return value
* @param arg_td_v. type descriptions for arguments, in positional order
* @param is_noexcept. true iff function marked noexcept
**/
static std::unique_ptr<FunctionTdx> make_function(TypeDescr retval_td,
std::vector<TypeDescr> arg_td_v);
std::vector<TypeDescr> arg_td_v,
bool is_noexcept);
// ----- Inherited from TypeDescrExtra -----
@ -28,12 +32,14 @@ namespace xo {
virtual TaggedPtr child_tp(uint32_t i, void * object) const override;
const std::string & struct_member_name(uint32_t i) const override;
virtual uint32_t n_fn_arg() const override { return arg_td_v_.size(); }
virtual TypeDescr fn_retval() const override { return retval_td_; }
virtual uint32_t n_fn_arg() const override { return arg_td_v_.size(); }
virtual TypeDescr fn_arg(uint32_t i) const override { return arg_td_v_[i]; }
virtual bool fn_is_noexcept() const override { return is_noexcept_; }
private:
FunctionTdx(TypeDescr retval_td,
bool is_noexcept,
std::vector<TypeDescr> arg_td_v);
private:
@ -41,6 +47,8 @@ namespace xo {
TypeDescr retval_td_;
/** function arguments, in positional order **/
std::vector<TypeDescr> arg_td_v_;
/** true iff function promises never to throw **/
bool is_noexcept_ = false;
}; /*FunctionTdx*/
} /*namespace reflect*/
} /*namespace xo*/

19
src/reflect/function/FunctionTdx.cpp
View file

@ -5,19 +5,28 @@
namespace xo {
namespace reflect {
/** create instance. Will be invoked exactly once for each reflected function type **/
/** create instance. Will be invoked exactly once for each reflected function type **/
std::unique_ptr<FunctionTdx>
FunctionTdx::make_function(TypeDescr retval_td,
std::vector<TypeDescr> arg_td_v)
std::vector<TypeDescr> arg_td_v,
bool is_noexcept)
{
return std::unique_ptr<FunctionTdx>(new FunctionTdx(retval_td, std::move(arg_td_v)));
return std::unique_ptr<FunctionTdx>(new FunctionTdx(retval_td,
is_noexcept,
std::move(arg_td_v)));
}
FunctionTdx::FunctionTdx(TypeDescr retval_td,
bool is_noexcept,
std::vector<TypeDescr> arg_td_v)
: retval_td_{retval_td},
arg_td_v_{std::move(arg_td_v)}
{}
arg_td_v_{std::move(arg_td_v)},
is_noexcept_{is_noexcept}
{
if (!retval_td) {
throw std::runtime_error("FunctionTdx::ctor: null return type?");
}
}
TaggedPtr
FunctionTdx::child_tp(uint32_t /*i*/, void * /*object*/) const