函数调用规范

本文详细介绍了三种不同的参数传递约定:__stdcall、__cdecl 和 __fastcall。每种约定都包括参数传递顺序、栈维护责任、名称修饰约定等内容。通过本文,读者可以了解不同参数传递约定的特点及其在实际编程中的应用。

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__stdcall:

Element                   Implementation

Argument-passing order            Right to left.

Argument-passing convention        By value, unless a pointer or reference type is passed.

Stack-maintenance responsibility    Called function pops its own arguments from the stack.

Name-decoration convention        An underscore (_) is prefixed to the name. The name is followed by the at sign (@) followed by the number of bytes (in decimal) in the argument list. Therefore, the function declared as int func( int a, double b ) is decorated as follows: _func@12

Case-translation convention        None

__cdecl:

Element                 Implementation
Argument-passing order             Right to left
Stack-maintenance responsibility     Calling function pops the arguments from the stack
Name-decoration convention         Underscore character (_) is prefixed to names
Case-translation convention         No case translation performed

__fastcall:

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.

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