函数调用&返回

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（重点）

• 为什么使用函数
  • 代码重用 by 不同输入->返回值

caller & callee

在汇编中 称之为procedure

conclusion

• parameters
• local vars
• return value
• return address

作用域（scope）matters

• 变量命名

形参（former parameter）&实参（actual parameter）

Because the compiler does not know how many variables it will need to allocate dynamically, it reserves a lot of space for expansion.

The stack frame usually includes the following items

• arguments (parameter values) passed to the routine;

• return address back to the routine’s caller;

• caller’s ebp;

• space for the local variables of the routine- saved registers