标签：
首先我们先看一下C程序的返回值处理情况，我们知道当C函数返回int等小型数据时直接将返回值放入eax寄存器。那当返回大的数据结构又是如何处理呢?看如下一段代码：
#include
typedef struct big_thing
{
char buf[128];
}big_thing;
big_thing return_test()
{
big_thing b;
b.buf[0]=0;
retutn b;
}
int main(int argc, char *argv[])
{
big_thing n=return_test();
return 0;
}http://imgur.com/8GHXFDT
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根据这段代码的汇编代码可以知道这段代码是这样执行的：
1. 首先main函数在栈上开辟了一片空间，并将这块空间的一部分作为传递返回值的临时对象temp;
2. 将temp对象的返回地址作为隐含参数传递给return_test();
3. return_tes()函数将数据拷贝给temp对象(对应下图复制1)，并将temp对象的地址用eax寄存器传出;
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原文地址：http://www.cnblogs.com/qqruizi/p/4430734.html
