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#pragma once
#include "Utils/TypeInfo.h"
namespace os {
/**
* Representation of parameters to be passed to a function on another thread.
*
* Usage:
* FnCall<Result, N> call = fnCall().add(x).add(y)
*/
// Function declaration used for performing the actual call later on.
typedef void (*CallThunk)(const void *fn, bool member, void **params, void *first, void *result);
namespace impl {
// Storing a sequence of parameters.
template <class Here, class Prev>
struct Param {
typedef Prev PrevType;
typedef Here HereType;
enum { count = Prev::count + 1 };
Prev prev;
Here *param;
Param(const Prev &prev, Here ¶m) : prev(prev), param(¶m) {}
template <class T>
Param<T, Param<Here, Prev>> add(T ¶m) const {
return Param<T, Param<Here, Prev>>(*this, param);
}
void extract(void **into) const {
into[count - 1] = param;
prev.extract(into);
}
};
template <>
struct Param<void, void> {
typedef void PrevType;
enum { count = 0 };
Param() {}
template <class T>
Param<T, Param<void, void>> add(T ¶m) const {
return Param<T, Param<void, void>>(*this, param);
}
void extract(void **) const {}
};
template <class Result, class Par>
void call(const void *fn, bool member, void **params, void *first, void *result);
}
inline impl::Param<void, void> fnCall() {
return impl::Param<void, void>();
}
/**
* Storage of the parameters in a type-agnostic way.
*/
class FnCallRaw {
friend class UThread;
public:
// Create from pre-computed data (low-level).
FnCallRaw(void **params, CallThunk thunk);
// Destroy.
~FnCallRaw();
// Helper to invoke 'thunk'.
inline void callRaw(const void *fn, bool member, void *first, void *result) const {
(*thunk)(fn, member, params(), first, result);
}
// Get 'params'.
inline void **params() const {
return (void **)(paramsData & ~size_t(0x1));
}
protected:
// Dummy ctor.
FnCallRaw();
// Array containing the source address of the parameters, and a flag indicating wether we're
// owning the memory or not.
size_t paramsData;
// Set 'params'.
bool freeParams() const;
void params(void **data, bool owner);
// Function to invoke in order to copy parameters and perform the actual call.
CallThunk thunk;
#ifdef USE_MOVE
FnCallRaw(FnCallRaw &&o);
FnCallRaw &operator =(FnCallRaw &&o);
#endif
private:
// Copy and assignment are not supported.
FnCallRaw(const FnCallRaw &o);
FnCallRaw &operator =(const FnCallRaw &o);
};
template <class T, int alloc = -1>
class FnCall : public FnCallRaw {
public:
// Create from a 'fnCall' sequence.
template <class H, class P>
FnCall(const impl::Param<H, P> &src) {
nat count = src.count;
if (alloc < 0) {
params(new void *[count], true);
} else {
assert(nat(alloc) >= count, L"Not enough memory allocated to FnCall.");
params(memory, false);
}
src.extract(params());
thunk = &impl::call<T, impl::Param<H, P>>;
}
// Call the function, optionally adding a first parameter.
T call(const void *fn, bool member, void *first = null) const {
byte result[sizeof(T)];
(*thunk)(fn, member, params(), first, result);
T *resPtr = (T *)(void *)result;
T tmp = *resPtr;
resPtr->~T();
return tmp;
}
private:
void *memory[alloc > 0 ? alloc : 1];
};
template <int alloc>
class FnCall<void, alloc> : public FnCallRaw {
public:
// Create from a 'fnCall' sequence.
template <class H, class P>
FnCall(const impl::Param<H, P> &src) {
nat count = src.count;
if (alloc < 0) {
params(new void *[count], true);
} else {
assert(alloc >= count, L"Not enough memory allocated to FnCall.");
params(memory, false);
}
src.extract(params());
thunk = &impl::call<void, impl::Param<H, P>>;
}
// Call the function, optionally adding a first parameter.
void call(const void *fn, bool member, void *first = null) const {
(*thunk)(fn, member, params(), first, null);
}
private:
void *memory[alloc > 0 ? alloc : 1];
};
}
#if defined(VISUAL_STUDIO) && defined(X86)
#include "FnCallX86.h"
#else
#include "FnCallImpl.h"
#endif
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