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[compiler] activation records

2010-09-19 21:22:06| 分类： compiler | 标签： |举报 |字号大中小订阅

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stack 中表示这个函数 local variables, parameters, return address, other temporaries 的一段空间，称为 activation record or stack frame.

higher-order function, first-class function, 把函数当 variable 来传，且子函数能访问父函数的 variables

fun f(x) =

let fun g(y) = x+y

in g

end

val h = f(3)

val z = h(5)

如上，支持这样的语言(ML, scheme, lua)，就无法用 stack 来保存 local variables

同时满足下面两个条件的，称为 higher-order function

1. nested functions

2. functions as returnable values

Pascal 属于 1. 子函数能访问父函数的 variables，但因为函数不能当返回值，所以可以用 stack 来保存所有的 local variables

而 C 属于 2. 但不满足 1. 也就没有"子函数能访问父函数的 variables"一说了。

to be continue ...

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