/usr/share/acl2-8.0dfsg/memoize.lisp is in acl2-source 8.0dfsg-1.
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; Copyright (C) 2017, Regents of the University of Texas
; This version of ACL2 is a descendent of ACL2 Version 1.9, Copyright
; (C) 1997 Computational Logic, Inc. See the documentation topic NOTE-2-0.
; This program is free software; you can redistribute it and/or modify
; it under the terms of the LICENSE file distributed with ACL2.
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; LICENSE for more details.
; Written by: Matt Kaufmann and J Strother Moore
; email: Kaufmann@cs.utexas.edu and Moore@cs.utexas.edu
; Department of Computer Science
; University of Texas at Austin
; Austin, TX 78712 U.S.A.
; memoize.lisp -- Logical definitions for memoization functions.
; The original version of this file was contributed by Bob Boyer and
; Warren A. Hunt, Jr. The design of this system of Hash CONS,
; function memoization, and fast association lists (applicative hash
; tables) was initially implemented by Boyer and Hunt.
(in-package "ACL2")
#+(or acl2-loop-only (not hons))
(defn clear-memoize-table (fn)
; Warning: Keep the return values in sync for the logic and raw Lisp.
fn)
#+(or acl2-loop-only (not hons))
(defn clear-memoize-tables ()
; Warning: Keep the return values in sync for the logic and raw Lisp.
nil)
#+(or acl2-loop-only (not hons))
(defn memoize-summary ()
; Warning: Keep the return values in sync for the logic and raw Lisp.
nil)
#+(or acl2-loop-only (not hons))
(defn clear-memoize-statistics ()
; Warning: Keep the return values in sync for the logic and raw Lisp.
nil)
(defmacro memsum ()
'(memoize-summary))
; The functions memoize and unmemoize have rather innocent looking
; semantics. But under the hood, they enable and disable memoization.
; The function memoize might cause errors due to compilation problems.
(defconst *hons-primitive-fns*
;; This affects acl2-exports, maybe other stuff
'(hons-copy
hons
hons-equal
hons-equal-lite
hons-clear
hons-clear!
hons-wash
hons-wash!
hons-summary
hons-resize-fn
get-slow-alist-action
hons-get
hons-acons
hons-acons!
fast-alist-fork
fast-alist-fork!
fast-alist-clean
fast-alist-clean!
fast-alist-len
fast-alist-free
fast-alist-summary
cons-subtrees
number-subtrees
flush-hons-get-hash-table-link
;; from memoize.lisp
clear-memoize-table
clear-memoize-tables
memoize-summary
clear-memoize-statistics))
(defconst *hons-primitives*
;; hons-related macros and primitive fns
(append '(hons-resize
set-slow-alist-action
memoize
unmemoize
memsum)
*hons-primitive-fns*))
(defconst *mht-default-size* 60)
(defun memoize-form (fn
condition
condition-p
condition-fn
hints
otf-flg
inline ; from :recursive argument
commutative
forget
memo-table-init-size
aokp
stats
ideal-okp)
; Jared Davis suggests that we consider bundling up these 13 parameters, for
; example into an alist. He says: "Various subsets of these arguments occur in
; spaghetti fashion throughout the code for memoize, add-trip, the
; memoize-table stuff, etc."
(declare (xargs :guard t))
(let ((condition (cond ((equal condition ''t) t)
((equal condition ''nil) nil)
(t condition))))
(cond
((and condition-fn (null condition-p))
`(progn (table memoize-table
(deref-macro-name ,fn (macro-aliases world))
(list* (cons :condition-fn ,condition-fn)
(cons :inline ,inline)
(cons :commutative ,commutative)
(cons :forget ,forget)
(cons :memo-table-init-size
,(or memo-table-init-size
*mht-default-size*))
(cons :aokp ,aokp)
(cons :stats ,stats)
(and (not (eq ,ideal-okp :default))
(list (cons :ideal-okp ,ideal-okp)))))
(value-triple (deref-macro-name
,fn
(macro-aliases (w state))))))
((and condition-p
(not (eq condition t))
(not (eq condition nil)))
`(make-event
(let* ((wrld (w state))
(fn (deref-macro-name ,fn (macro-aliases wrld)))
(condition ,condition)
(formals
(and (symbolp fn) ; guard for getprop
(getpropc fn 'formals t wrld)))
(stobjs-in (getpropc fn 'stobjs-in t wrld))
(condition-fn (or ,condition-fn
(add-suffix fn "-MEMOIZE-CONDITION")))
(hints ,hints)
(otf-flg ,otf-flg)
(inline ,inline)
(commutative ,commutative)
(forget ,forget)
(memo-table-init-size ,memo-table-init-size)
(aokp ,aokp)
(stats ,stats)
(ideal-okp ,ideal-okp))
(cond ((not (and
(symbolp fn)
(not (eq t formals))
(not (eq t stobjs-in))
(not (eq t (getpropc fn 'stobjs-out t
; Normally we would avoid getting the stobjs-out of return-last. But
; return-last will eventually be rejected for mamoization anyhow (by
; memoize-table-chk).
wrld)))
(cltl-def-from-name fn wrld)))
(er hard 'memoize
"The symbol ~x0 is not a known function symbol, and thus ~
it cannot be memoized."
fn))
; There seems to have been a time when the following had caused an error
; because of double evaluation of memoize forms by certify-book (not sure). So
; the following is commented out. That doesn't seem to cause a problem;
; redundancy of memoize forms seems to be handled well.
; ((cdr (assoc-eq fn (table-alist 'memoize-table wrld)))
; (er hard 'memoize "~x0 is already memoized." fn))
((not (member-eq inline '(t nil)))
(er hard 'memoize
"The value ~x0 for inline is illegal (must be ~x1 or ~
~x2)."
inline t nil))
(t
`(progn
(defun ,condition-fn ,formals
(declare
(ignorable ,@formals)
(xargs :guard
,(getpropc fn 'guard *t* wrld)
:verify-guards nil
,@(let ((stobjs (remove nil stobjs-in)))
(and stobjs
`(:stobjs ,stobjs)))))
,condition)
(verify-guards ,condition-fn
,@(and hints `(:hints ,hints))
,@(and otf-flg
`(:otf-flg ,otf-flg)))
(table memoize-table
',fn
(list* (cons :condition-fn ',condition-fn)
(cons :inline ',inline)
(cons :commutative ',commutative)
(cons :forget ',forget)
(cons :memo-table-init-size
(or ,memo-table-init-size
*mht-default-size*))
(cons :aokp ',aokp)
(cons :stats ,stats)
(and (not (eq ',ideal-okp :default))
(list (cons :ideal-okp ',ideal-okp)))))
(value-triple ',fn)))))))
(t `(progn (table memoize-table
(deref-macro-name ,fn (macro-aliases world))
(list* (cons :condition-fn ,condition) ; t or nil
(cons :inline ,inline)
(cons :commutative ,commutative)
(cons :forget ,forget)
(cons :memo-table-init-size
(or ,memo-table-init-size
*mht-default-size*))
(cons :aokp ',aokp)
(cons :stats ,stats)
(and (not (eq ',ideal-okp :default))
(list (cons :ideal-okp ',ideal-okp)))))
(value-triple (deref-macro-name
,fn
(macro-aliases (w state)))))))))
(defmacro memoize (fn &key
(condition 't condition-p)
condition-fn hints otf-flg
(recursive 't)
commutative
forget
memo-table-init-size
aokp
(stats ':default)
(ideal-okp ':default)
(verbose 't))
; WARNING: If you add a new argument here, consider making corresponding
; modifications to memoize-form, table-cltl-cmd, maybe-push-undo-stack, and
; add-trip. (These were the functions modified when adding the FORGET
; argument; the process was to see how the COMMUTATIVE argument was handled.)
; If condition and condition-fn are both non-nil, then the intent is
; that we do exactly what we would normally do for condition except
; that we use the name condition-fn.
; Parallelism blemish: when waterfall parallelism is enabled (detected by
; seeing whether ACL2 global 'waterfall-parallelism is non-nil), memoize and
; unmemoize should be changed to modify the 'saved-memoize-table instead of
; 'memoize-table.
(declare (xargs :guard (booleanp recursive))
(ignorable condition-p condition condition-fn hints otf-flg
recursive commutative forget memo-table-init-size
aokp stats ideal-okp verbose))
#-acl2-loop-only
`(progn (when (eql *ld-level* 0)
; We are not inside the ACL2 loop (hence not in certify-book, for
; example).
(let ((state *the-live-state*))
(warning$ 'memoize nil
"No change for function ~x0: Memoization ~
requests are ignored in raw Lisp. In raw ~
Lisp, use memoize-fn."
',fn)))
(value-triple nil))
#+acl2-loop-only
(cond
((symbolp fn)
(er hard 'memoize
"It is illegal for the first argument of MEMOIZE to be a symbol. ~
Note that the arguments to MEMOIZE are evaluated; so perhaps you ~
intended the first argument to be (QUOTE ~x0) or, equivalently, '~x0."
fn))
(t
(let* ((inline recursive)
(form
(cond
((eq commutative t)
`(make-event
(let* ((fn ,fn)
(commutative (add-suffix fn "-COMMUTATIVE")))
(list ; use encapsulate so that each form is printed first
'encapsulate
()
(list 'value-triple ; avoid redundancy for the encapsulate
(kwote (cons (max-absolute-event-number (w state))
(car (global-val 'include-book-path
(w state))))))
(list 'defthm commutative
(list 'equal
(list fn 'x 'y)
(list fn 'y 'x))
:rule-classes nil)
(memoize-form (kwote fn) ',condition ',condition-p
',condition-fn ',hints ',otf-flg ',inline
(kwote commutative)
',forget
',memo-table-init-size
',aokp
',stats
',ideal-okp)))))
(t (memoize-form fn condition condition-p condition-fn
hints otf-flg inline commutative forget
memo-table-init-size aokp stats ideal-okp)))))
(cond (verbose form)
(t `(with-output
:off (summary prove event)
:gag-mode nil
,form)))))))
(defmacro unmemoize (fn)
(declare (xargs :guard t))
#-acl2-loop-only
`(progn (when (eql *ld-level* 0)
; We are not inside the ACL2 loop (hence not in certify-book, for
; example).
(warning$ 'unmemoize nil
"No change for function ~x0: Unmemoization requests are ~
ignored in raw Lisp. In raw Lisp, use unmemoize-fn."
',fn))
(value-triple nil))
#+acl2-loop-only
`(with-output
:off summary
(progn (table memoize-table
(deref-macro-name ,fn (macro-aliases world))
nil)
(value-triple
(deref-macro-name ,fn (macro-aliases (w state)))))))
(defmacro profile (fn &rest r)
(declare (xargs :guard (and (keyword-value-listp r)
(not (assoc-keyword :condition r))
(not (assoc-keyword :condition-fn r))
(not (assoc-keyword :recursive r)))))
; Warning: See the comment in profiled-functions before eliminating :recursive
; nil, which corresponds to :inline nil in profile-fn.
`(memoize ,fn :condition nil :recursive nil ,@r))
(defmacro memoizedp-world (fn wrld)
`(let ((fn ,fn)
(wrld ,wrld))
(cond
((not (global-val 'hons-enabled wrld))
(er hard 'memoizedp
"Memoizedp cannot be called in this ACL2 image, as it requires a ~
hons-aware ACL2. See :DOC hons-and-memoization."))
(t
(cdr (assoc-eq fn (table-alist 'memoize-table wrld)))))))
(defmacro memoizedp (fn)
(declare (xargs :guard t))
`(memoizedp-world ,fn (w state)))
; Some centaur/ books put entries in *never-profile-ht*. In order to allow
; those books to certify in vanilla ACL2, we define a default value for that
; variable here.
#+(and (not hons) (not acl2-loop-only))
(defparameter *never-profile-ht*
(make-hash-table :test 'eq))
#+(or acl2-loop-only (not hons))
(defun never-memoize-fn (fn)
; Warning: Keep the return values in sync for the logic and raw Lisp.
(declare (xargs :guard (symbolp fn))
(ignore fn))
nil)
(defmacro never-memoize (fn)
(declare (xargs :guard (symbolp fn)))
`(make-event
(prog2$ (never-memoize-fn ',fn)
'(value-triple :invisible))
:check-expansion t))
(defconst *bad-lisp-consp-memoization*
'(bad-lisp-consp :forget t))
(defconst *thread-unsafe-builtin-memoizations*
; This alist associates built-in raw Lisp functions with corresponding
; keyword arguments for memoize-fn. These functions may be unsafe to memoize
; when using ACL2(hp).
(list *bad-lisp-consp-memoization*))
#+acl2-loop-only
(defun set-bad-lisp-consp-memoize (arg)
; Warning: Keep the return values in sync for the logic and raw Lisp.
(declare (xargs :guard t)
(ignore arg))
nil)
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