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x64Emitter: Add functions to call a C++ std::function from JITed code

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This commit is contained in:
Pierre Bourdon 2014-02-27 22:50:25 +01:00
parent 9869c53859
commit edba8096bf
1 changed files with 21 additions and 0 deletions
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21
Source/Core/Common/x64Emitter.h
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@ -8,6 +8,7 @@
#include <cstddef>
#include <cstring>
#include <functional>
#include "Common/Common.h"
#include "Common/MemoryUtil.h"
@ -739,6 +740,26 @@ public:
#define DECLARE_IMPORT(x) extern "C" void *__imp_##x
#endif
// Utility to generate a call to a std::function object.
//
// Unfortunately, calling operator() directly is undefined behavior in C++
// (this method might be a thunk in the case of multi-inheritance) so we
// have to go through a trampoline function.
template <typename T, typename... Args>
static void CallLambdaTrampoline(const std::function<T(Args...)>* f,
Args... args)
{
(*f)(args...);
}
template <typename T, typename... Args>
void ABI_CallLambdaC(const std::function<T(Args...)>* f, u32 p1)
{
// Double casting is required by VC++ for some reason.
auto trampoline = (void(*)())&XEmitter::CallLambdaTrampoline<T, Args...>;
ABI_CallFunctionPC((void*)trampoline, const_cast<void*>((const void*)f), p1);
}
}; // class XEmitter