How to get the variable or function address in memory?

hash has asked for the wisdom of the Perl Monks concerning the following question:

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Re: How to get the variable or function address in memory? by Joost (Canon) on Nov 02, 2004 at 08:12 UTC
There really is no reason to get at the address from perl. In fact both your examples are completely useless, but I assume that's because they're examples :-) If you want to interface with C code at this low level, you're better off using XS, or Inline::C. Note that a perl scalar variable is a much more complex data structure than a C string, but both XS and Inline::C can make the conversion (almost) transparant. updated: corrected typo "What should it profit a man, if he should win a flame war, yet lose his cool?"	[reply]
Re: How to get the variable or function address in memory? by Mr. Muskrat (Canon) on Nov 02, 2004 at 04:41 UTC
Generally with perl, just having the reference is enough. However, if you really think you need it then you can stringify the reference (sounds like what you have done already) to find out what type of reference it is (not the best way to do so, see ref) and where in perl's memory it resides.	[reply]
Re^2: How to get the variable or function address in memory? by ihb (Deacon) on Nov 02, 2004 at 12:37 UTC
An even better way than using `ref()` is to use `&reftype` and `&refaddr` in Scalar::Util. `ihb` See perltoc if you don't know which perldoc to read! Read argumentation in its context!	[reply] [d/l] [select]
Re: How to get the variable or function address in memory? by zentara (Cardinal) on Nov 02, 2004 at 13:54 UTC
I'm not a devel expert, but here is some code posted awhile back. `#!/usr/bin/perl use Devel::Peek; my $str = 'the key is:'; my $key = 'hello'; Dump($key); decrypt( $str, $key ); $key = 'gone!'; # $key = 'x'x100000; # a string that won't fit will change PV Dump($key); decrypt( $str, $key ); sub decrypt { warn "\nGot @_\n\n" }` [download] I'm not really a human, but I play one on earth. flash japh	[reply] [d/l]
Re: How to get the variable or function address in memory? by rcaputo (Chaplain) on Nov 09, 2004 at 19:20 UTC
The memory address is the numeric version of the reference. Some sample code follows. As an added bonus, it illustrates the use of the mysterious "P" unpack() template. Read more... (1265 Bytes)	[reply] [d/l]