Microsoft Specific —>
__cdecl
This is the default calling convention for C and C++ programs. Because the stack is cleaned up by the caller, it can do vararg functions. The __cdecl calling convention creates larger executables than __stdcall, because it requires each function call to include stack cleanup code. The following list shows the implementation of this calling convention.
|
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 |
__stdcall
The __stdcall calling convention is used to call Win32 API functions. The callee cleans the stack, so the compiler makes vararg functions __cdecl. Functions that use this calling convention require a function prototype. The following list shows the implementation of this calling convention.
|
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 |
|
Case-translation convention |
No case translation performed |
__fastcall
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 |
Calling 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 |
thiscall
This is the default calling convention used by C++ member functions that do not use variable arguments. The callee cleans the stack, so the compiler makes vararg functions __cdecl, and pushes the this pointer on the stack last. The thiscall calling convention cannot be explicitly specified in a program, because thiscall is not a keyword.
All function arguments are pushed on the stack. Because this calling convention applies only to C++, there is no C name decoration scheme.
END Microsoft Specific
