Table of Contents
Here we begin with a discussion of how to invoke ACL2
interactively. We then discuss testing as well as the
books. We conclude with a discussion of
acl2-8.1. The sources and perhaps an executable image are located on that subdirectory. However, if you have not saved an image but instead use the directions for Running Without Building an Executable Image, skip to When ACL2 Starts Up below.
The executable image is called
acl2-8.1/saved_acl2. You can
invoke ACL2 by running that image, e.g.,
If you on a Unix-like system, then to make it easy to invoke ACL2 by typing a short command, e.g.,
you may want to install an executable file on your path, e.g.,
/usr/local/bin/acl2, containing the following two lines:
Note: A carriage return in the file after the last line above may be important!
Most or all hosts then automatically enter the ACL2 ``command loop,'' an ACL2 read-eval-print loop with the prompt:
ACL2 !>If however a host leaves you in Common Lisp's read-eval-print loop, then you'll need to evaluate the Common Lisp expression
(LP)if the current package is
Once in the ACL2 command loop, you can type an ACL2 term, typically followed by ``return'' or ``enter,'' and ACL2 will evaluate the term, print its value, and prompt you for another one. Below are three simple interactions:
ACL2 !>t T ACL2 !>'abc ABC ACL2 !>(+ 2 2) 4
To get out of the ACL2 command loop, type the
This returns you to the host Common Lisp. We sometimes call this
``raw Lisp.'' You may re-enter the command loop with
(LP) as above.
Note that when you are in raw Lisp you can overwrite or destroy ACL2 by executing inappropriate Common Lisp expressions. All bets are off once you've exited our loop. That said, many users do it. For example, you might exit our loop, activate some debugging or trace features in raw Lisp, and then reenter our loop. While developing proofs or tracking down problems, this is reasonable behavior.
Now you are ready to test your image.
An easy way to test the theorem prover is to type the following term to the ACL2 command loop:
:mini-proveallThis will cause a moderately long sequence of commands to be processed, each of which is first printed out as though you had typed it. Each will print some text, generally a proof of some conjecture. None should fail.
A more elaborate test is to certify
books, which is a good idea anyhow; this is our next
topic. On a Unix-like system, you can also certify just a
small but useful subset of the books in a few minutes by
executing, in directory
books/, have been contributed mainly by users. The general topic of books is discussed thoroughly in the ACL2 books documentation.
Books should be certified before they are used. We do not distribute certificates with our books, mainly because certification produces compiled code specific to the host. You should certify the books locally, both as a test of your ACL2 image and because books generally need to be certified before they can be used. Our main installation page contains simple instructions for how to perform this certification. For additional explanation and further options, see the documentation for BOOKS-CERTIFICATION.
Next proceed to the section on Documentation.
/acl2-8.1/emacs/emacs-acl2.el. Utilities offered by this file are documented near the top of the file. In particular, this file automatically loads the ACL2-Doc Emacs browser.