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[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(272) 評(píng)論(0) 編輯收藏引用所屬分類: Language

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[zz]MFC - __fastcall

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