在 Perl 中，如何检查给定函数是从哪个模块导入的? [英] In Perl, how can I check from which module a given function was imported?

问题描述

我有一个调用函数的代码.但是我不知道这个函数属于哪个模块.我需要它来修改这个功能.

I have a code which calls the function. But I don't know the module this function belongs to. I need it to modify this function.

如何查看?

推荐答案

Devel::Peek 模块对于获取有关变量的各种信息非常方便.您可以使用它做的一件事是转储对子程序的引用并获取它来自的 glob 的名称:

The Devel::Peek module is very handy to get all sorts of information about variables. One of the things you can do with it is dump a reference to a subroutine and get the name of the glob it came from:

$  perl -MDevel::Peek -MList::Util=first -e'Dump(&first)'
SV = IV(0x1094e20) at 0x1094e28
  REFCNT = 1
  FLAGS = (TEMP,ROK)
  RV = 0x11183b0
  SV = PVCV(0x10ff1f0) at 0x11183b0
    REFCNT = 3
    FLAGS = (POK,pPOK)
    PROTOTYPE = "&@"
    COMP_STASH = 0x0
    XSUB = 0x7f7ecbdc61b0
    XSUBANY = 0
    GVGV::GV = 0x11183c8        "List::Util" :: "first"
    FILE = "ListUtil.c"
    DEPTH = 0
    FLAGS = 0x800
    OUTSIDE_SEQ = 0
    PADLIST = 0x0
    OUTSIDE = 0x0 (null)

GVGV::GV 部分很重要.

另一种解决方案是Sub::Identify，它实际上只为您提供给它的代码引用的名称.然而，了解 Devel::Peek 在许多其他情况下也很方便，所以我首先提到了这一点.

An alternative solution would be Sub::Identify, which really only gives you names for code references you hand to it. However, knowing about Devel::Peek is handy in many other situations too, so I mentioned that first.

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