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            小默

            [zz]MFC - __fastcall

            Microsoft Specific

            The __fastcall calling convention specifies that arguments to functions are to be passed in registers, when possible. The following list shows the implementation of this calling convention.

            Element Implementation
            Argument-passing order The first two DWORD or smaller arguments are passed in ECX and EDX registers; all other arguments are passed right to left.
            Stack-maintenance responsibility Called function pops the arguments from the stack.
            Name-decoration convention At sign (@) is prefixed to names; an at sign followed by the number of bytes (in decimal) in the parameter list is suffixed to names.
            Case-translation convention No case translation performed.
            Note   Future compiler versions may use different registers to store parameters.

            Using the /Gr compiler option causes each function in the module to compile as fastcall unless the function is declared with a conflicting attribute, or the name of the function is main.

            Example

            In the following example, the function named DeleteAggrWrapper is passed arguments in registers:

            // Example of the __fastcall keyword
            #define FASTCALL    __fastcall
               
            void FASTCALL DeleteAggrWrapper(void* pWrapper);
            // Example of the __ fastcall keyword on function pointer
            typedef BOOL (__fastcall *funcname_ptr)(void * arg1, const char * arg2, DWORD flags, );

             

            posted on 2009-11-12 21:57 小默 閱讀(274) 評論(0)  編輯 收藏 引用 所屬分類: Language

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