使用汇编code目标C程序中（X code） [英] using assembly code inside Objective c program (Xcode)

问题描述

有没有办法使用目标C程序中组装code的一种方式。我开发OSX应用程序，并想用汇编code旁边的目标C code。我在网上搜索，发现这但我不能够执行任何这些成功的方法。任何帮助将大大AP preciated。

Is there a way to use assembly code inside Objective C program. I am developing an application for OSX and wanted to use assembly code alongside the Objective C code. I searched the internet and found this But I am not able to implement any of these methods successfully. Any help will be greatly appreciated.

推荐答案

是的，当然。

您可以使用GCC式内联汇编在Objective-C，就像你在C.您还可以在汇编源文件中定义的函数和Objective-C的给他们打电话。这里是内联汇编的一个简单的例子：

You can use GCC-style inline assembly in Objective-C just like you would in C. You can also define functions in assembly source files and call them from Objective-C. Here's a trivial example of inline assembly:

int foo(int x, int y) {
    __asm("add %1, %0" : "+r" (x) : "r" (y));
    return x;
}

和如何使用一个独立的汇编文件一个类似的小例子：

And a similarly minimal example of how to use a standalone assembly file:

** myOperation.h **
int myOperation(int x, int y);

** myOperation.s **
.text
.globl _myOperation
_myOperation:
    add %esi, %edi  // add x and y
    mov %edi, %eax  // move result to correct register for return value
    ret

** foo.c **
#include "myOperation.h"   // include header for declaration of myOperation
...
int x = 1, y = 2;
int z = myOperation(x, y); // call function defined in myOperation.s

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