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|
; VL 2014 -- VL Verilog Toolkit, 2014 Edition
; Copyright (C) 2008-2015 Centaur Technology
;
; Contact:
; Centaur Technology Formal Verification Group
; 7600-C N. Capital of Texas Highway, Suite 300, Austin, TX 78731, USA.
; http://www.centtech.com/
;
; License: (An MIT/X11-style license)
;
; Permission is hereby granted, free of charge, to any person obtaining a
; copy of this software and associated documentation files (the "Software"),
; to deal in the Software without restriction, including without limitation
; the rights to use, copy, modify, merge, publish, distribute, sublicense,
; and/or sell copies of the Software, and to permit persons to whom the
; Software is furnished to do so, subject to the following conditions:
;
; The above copyright notice and this permission notice shall be included in
; all copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
; DEALINGS IN THE SOFTWARE.
;
; Original author: Jared Davis <jared@centtech.com>
(in-package "VL2014")
(include-book "expressions")
(local (include-book "../../util/arithmetic"))
; LVALUES
;
; Lvalues are used in the various assignment statements. The Verilog grammar
; distinguishes between variable_lvalues and net_lvalues, but if we expand away
; simple aliases such as hierarchial_net_identifier ::= hierarchial_identifier,
; and also account for our treatment of constant_expression, then we see that
; both of these are actually the same thing:
;
; net_lvalue ::=
; hierarchial_identifier [ { '[' expression ']' '[' range_expression ']' } ]
; | '{' net_lvalue { ',' net_lvalue } '}'
;
; variable_lvalue ::=
; hierarchial_identifier [ { '[' expression ']' '[' range_expression ']' } ]
; | '{' variable_lvalue { ',' variable_lvalue } '}'
;
; So we will only talk about lvalues, and not about net_lvalues or
; variable_lvalues.
;
; Furthermore, lvalues are a subset of the expressions, formed by closing the
; bit- and part-selected hierarchial identifiers under concatenation. So
; rather than introduce a new data type to represent the lvalues, we just
; represent them as expressions.
(defparsers parse-lvalues
:flag-local nil
(defparser vl-parse-lvalue ()
:measure (two-nats-measure (vl-tokstream-measure) 0)
:verify-guards nil
(if (not (vl-is-token? :vl-lcurly))
(vl-parse-indexed-id)
(seq tokstream
(:= (vl-match-token :vl-lcurly))
(args := (vl-parse-1+-lvalues-separated-by-commas))
(:= (vl-match-token :vl-rcurly))
(return (make-vl-nonatom :op :vl-concat
:args args)))))
(defparser vl-parse-1+-lvalues-separated-by-commas ()
:measure (two-nats-measure (vl-tokstream-measure) 1)
(seq tokstream
(first :s= (vl-parse-lvalue))
(when (vl-is-token? :vl-comma)
(:= (vl-match))
(rest := (vl-parse-1+-lvalues-separated-by-commas)))
(return (cons first rest)))))
(encapsulate
()
(local (in-theory (enable vl-parse-lvalue
vl-parse-1+-lvalues-separated-by-commas)))
;; (defthm-parse-lvalues-flag token-list
;; (vl-parse-lvalue
;; (vl-tokenlist-p (mv-nth 2 (vl-parse-lvalue))))
;; (vl-parse-1+-lvalues-separated-by-commas
;; (vl-tokenlist-p (mv-nth 2 (vl-parse-1+-lvalues-separated-by-commas))))
;; :hints(("Goal" :do-not '(generalize fertilize))
;; (and acl2::stable-under-simplificationp
;; (flag::expand-calls-computed-hint
;; acl2::clause
;; (flag::get-clique-members 'vl-parse-lvalue-fn (w state))))))
(defthm-parse-lvalues-flag count-strong
(vl-parse-lvalue
(and (<= (vl-tokstream-measure :tokstream (mv-nth 2 (vl-parse-lvalue)))
(vl-tokstream-measure))
(implies (not (mv-nth 0 (vl-parse-lvalue)))
(< (vl-tokstream-measure :tokstream (mv-nth 2 (vl-parse-lvalue)))
(vl-tokstream-measure))))
:rule-classes ((:rewrite) (:linear)))
(vl-parse-1+-lvalues-separated-by-commas
(and (<= (vl-tokstream-measure :tokstream (mv-nth 2 (vl-parse-1+-lvalues-separated-by-commas)))
(vl-tokstream-measure))
(implies (not (mv-nth 0 (vl-parse-1+-lvalues-separated-by-commas)))
(< (vl-tokstream-measure :tokstream (mv-nth 2 (vl-parse-1+-lvalues-separated-by-commas)))
(vl-tokstream-measure))))
:rule-classes ((:rewrite) (:linear)))
:hints(("Goal" :do-not '(generalize fertilize))
(and acl2::stable-under-simplificationp
(flag::expand-calls-computed-hint
acl2::clause
(flag::get-clique-members 'vl-parse-lvalue-fn (w state))))))
(defthm-parse-lvalues-flag fails-gracefully
(vl-parse-lvalue
(and (implies (mv-nth 0 (vl-parse-lvalue))
(not (mv-nth 1 (vl-parse-lvalue))))
(iff (vl-warning-p (mv-nth 0 (vl-parse-lvalue)))
(mv-nth 0 (vl-parse-lvalue)))))
(vl-parse-1+-lvalues-separated-by-commas
(and (implies (mv-nth 0 (vl-parse-1+-lvalues-separated-by-commas))
(not (mv-nth 1 (vl-parse-1+-lvalues-separated-by-commas))))
(iff (vl-warning-p (mv-nth 0 (vl-parse-1+-lvalues-separated-by-commas)))
(mv-nth 0 (vl-parse-1+-lvalues-separated-by-commas)))))
:hints(("Goal" :do-not '(generalize fertilize))
(and acl2::stable-under-simplificationp
(flag::expand-calls-computed-hint
acl2::clause
(flag::get-clique-members 'vl-parse-lvalue-fn (w state))))))
(defthm-parse-lvalues-flag result
(vl-parse-lvalue
(equal (vl-expr-p (mv-nth 1 (vl-parse-lvalue)))
(not (mv-nth 0 (vl-parse-lvalue)))))
(vl-parse-1+-lvalues-separated-by-commas
(vl-exprlist-p (mv-nth 1 (vl-parse-1+-lvalues-separated-by-commas))))
:hints(("Goal" :do-not '(generalize fertilize))
(and acl2::stable-under-simplificationp
(flag::expand-calls-computed-hint
acl2::clause
(flag::get-clique-members 'vl-parse-lvalue-fn (w state))))))
;; (defthm-parse-lvalues-flag pstate
;; (vl-parse-lvalue
;; (vl-parsestate-p (mv-nth 3 (vl-parse-lvalue))))
;; (vl-parse-1+-lvalues-separated-by-commas
;; (vl-parsestate-p (mv-nth 3 (vl-parse-1+-lvalues-separated-by-commas))))
;; :hints(("Goal" :do-not '(generalize fertilize))
;; (and acl2::stable-under-simplificationp
;; (flag::expand-calls-computed-hint
;; acl2::clause
;; (flag::get-clique-members 'vl-parse-lvalue-fn (w state))))))
(defthm-parse-lvalues-flag parse-lvalues-true-listp
(vl-parse-lvalue
t
:rule-classes nil)
(vl-parse-1+-lvalues-separated-by-commas
(true-listp (mv-nth 1 (vl-parse-1+-lvalues-separated-by-commas)))
:rule-classes :type-prescription)
:hints(("Goal" :do-not '(generalize fertilize))
(and acl2::stable-under-simplificationp
(flag::expand-calls-computed-hint
acl2::clause
(flag::get-clique-members 'vl-parse-lvalue-fn (w state))))))
(verify-guards+ vl-parse-lvalue))
; ASSIGNMENTS
;
; The grammar also distinguishes between variable_assignment and
; net_assignment, but with our treatment of lvalue there is no longer any
; difference, so we merely use "assignment".
;
; variable_assignment ::=
; lvalue '=' expression
;
; net_assignment ::=
; lvalue '=' expression
(defparser vl-parse-assignment ()
;; Returns a (lvalue . expr) pair
:result (and (consp val)
(vl-expr-p (car val))
(vl-expr-p (cdr val)))
:fails gracefully
:count strong
(seq tokstream
(lvalue := (vl-parse-lvalue))
(:= (vl-match-token :vl-equalsign))
(expr := (vl-parse-expression))
(return (cons lvalue expr))))
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