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• Std/io
• Print-object$
• Serialize

Print-compressed

Wrapper for print-object$ that ensures serialize compression is enabled (if supported).

Signature

(print-compressed obj &optional (channel 'channel) (state 'state)) 
  → 
state

Arguments

obj — The object to print.

channel — An open :output channel.
    Guard (and (symbolp channel) (open-output-channel-p channel :object state)) .

When writing to an :object stream, ACL2 can print objects in a serialized format that provides compression when there is a lot of structure sharing, but which is hard for humans to read.

Using print-compressed ensures that, on hons-enabled versions of ACL2 (which is all versions), your object will be printed with this compression enabled. The resulting object typically looks like #Z... in the file, where ... is a binary blob that makes no sense to humans. These objects can later be read back in by ACL2's read-object.

Definitions and Theorems

Function: print-compressed-fn

(defun print-compressed-fn (obj channel state)
  (declare (xargs :stobjs (state)))
  (declare
       (xargs :guard (and (symbolp channel)
                          (open-output-channel-p channel
                                                 :object state))))
  (let ((__function__ 'print-compressed))
    (declare (ignorable __function__))
    (print-legibly-aux obj t channel state)))

Theorem: state-p1-of-print-compressed

(defthm state-p1-of-print-compressed
  (let ((ret (print-compressed obj channel state)))
    (implies (and (state-p1 state)
                  (symbolp channel)
                  (open-output-channel-p1 channel
                                          :object state))
             (state-p1 ret))))

Theorem: open-output-channel-p1-of-print-compressed

(defthm open-output-channel-p1-of-print-compressed
  (let ((ret (print-compressed obj channel state)))
    (implies (and (state-p1 state)
                  (symbolp channel)
                  (open-output-channel-p1 channel
                                          :object state))
             (open-output-channel-p1 channel
                                     :object ret))))

Subtopics

Print-legibly-aux

Wrapper for print-object$ that handles setting up serialize compression.