Calling Convention in C and C++

Calling Conventions:

Keyword	Remarks
__cdecl	Default calling convention for C and C++ programs.
__stdcalll	Used to call win32 API functions.
__fastcall	Argument to functions are to be passed in register when possible.
thiscall	Default calling conventions used by C++ member functions that do not use variable arguments. It is not explicitly defined in a program, because it is not a keyword.

Keyword	Stack Cleanup	Parameter Passing
__cdecl	Caller	R To L
__stdcalll	Callee	R To L
__fastcall	Callee	Stored in registers, then pushed on stack
thiscall	Callee	Pushed on stack, this pointer stored in ECX

Note: __cdeclspec (extended attribute) declarator

If specifies that an instance of a given type is to be stored with a Microsoft specific storage class attribute.