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Advanced info on CPU Emulators

 
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Old 06-13-2011
Advanced info on CPU Emulators
I have searched and searched this topic but without looking at source code ; my next step maybe , I find the same ambiguous information.

My main question is how is the target code translated? It is stated that there are variables created that hold the data that the emulated CPU would hold in it's registers so I assume that an algorithm is run with this data to produce the binary that the CPU needs. Would these variables represent a dummy CPU and the algorithms convert the target CPU variables (registers) to what the host can execute?

Interpreted implies that the Emulator would just be substituting code for other code from a look-up table but then the program would actually be more or less ported at this point would it not?

Any help or direction will be appreciated.Smilie
 
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LEARN ABOUT CENTOS

less

less(3pm)						 Perl Programmers Reference Guide						 less(3pm)

NAME

       less - perl pragma to request less of something

SYNOPSIS

	   use less 'CPU';

DESCRIPTION

       This is a user-pragma. If you're very lucky some code you're using will know that you asked for less CPU usage or ram or fat or... we just
       can't know. Consult your documentation on everything you're currently using.

       For general suggestions, try requesting "CPU" or "memory".

	   use less 'memory';
	   use less 'CPU';
	   use less 'fat';

       If you ask for nothing in particular, you'll be asking for "less 'please'".

	   use less 'please';

FOR MODULE AUTHORS

       less has been in the core as a "joke" module for ages now and it hasn't had any real way to communicating any information to anything.
       Thanks to Nicholas Clark we have user pragmas (see perlpragma) and now "less" can do something.

       You can probably expect your users to be able to guess that they can request less CPU or memory or just "less" overall.

       If the user didn't specify anything, it's interpreted as having used the "please" tag. It's up to you to make this useful.

	 # equivalent
	 use less;
	 use less 'please';

   "BOOLEAN = less->of( FEATURE )"
       The class method "less->of( NAME )" returns a boolean to tell you whether your user requested less of something.

	 if ( less->of( 'CPU' ) ) {
	     ...
	 }
	 elsif ( less->of( 'memory' ) ) {

	 }

   "FEATURES = less->of()"
       If you don't ask for any feature, you get the list of features that the user requested you to be nice to. This has the nice side effect
       that if you don't respect anything in particular then you can just ask for it and use it like a boolean.

	 if ( less->of ) {
	     ...
	 }
	 else {
	     ...
	 }

CAVEATS

       This probably does nothing.
       This works only on 5.10+
	   At least it's backwards compatible in not doing much.

perl v5.16.3							    2013-02-26								 less(3pm)