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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 "utils")
(include-book "../../parsetree")
(local (include-book "../../util/arithmetic"))
(defsection parse-strengths
:parents (parser)
:short "Functions for parsing drive/charge strengths."
:long "<p>From Verilog-2005:</p>
@({
drive_strength ::=
'(' strength0 ',' strength1 ')'
| '(' strength1 ',' strength0 ')'
| '(' strength0 ',' 'highz1' ')'
| '(' strength1 ',' 'highz0' ')'
| '(' 'highz0' ',' strength1 ')'
| '(' 'highz1' ',' strength0 ')'
strength0 ::= 'supply0' | 'strong0' | 'pull0' | 'weak0'
strength1 ::= 'supply1' | 'strong1' | 'pull1' | 'weak1'
charge_strength ::= '(' ['small'|'medium'|'large'] ')'
})")
(local (xdoc::set-default-parents parse-strengths))
(defval *vl-strength0-alist*
:showval t
'((:vl-kwd-supply0 . :vl-supply)
(:vl-kwd-strong0 . :vl-strong)
(:vl-kwd-pull0 . :vl-pull)
(:vl-kwd-weak0 . :vl-weak)))
(defval *vl-strength1-alist*
:showval t
'((:vl-kwd-supply1 . :vl-supply)
(:vl-kwd-strong1 . :vl-strong)
(:vl-kwd-pull1 . :vl-pull)
(:vl-kwd-weak1 . :vl-weak)))
(defval *vl-ds0-alist*
:showval t
(cons '(:vl-kwd-highz0 . :vl-highz) *vl-strength0-alist*))
(defval *vl-ds1-alist*
:showval t
(cons '(:vl-kwd-highz1 . :vl-highz) *vl-strength1-alist*))
(defval *vl-ds0-keywords*
:showval t
(strip-cars *vl-ds0-alist*))
(defval *vl-ds1-keywords*
:showval t
(strip-cars *vl-ds1-alist*))
(defval *vl-ds0/1-keywords*
:showval t
(append *vl-ds0-keywords* *vl-ds1-keywords*))
(defparser vl-parse-drive-strength ()
:short "Match @('drive_strength'), return a @(see vl-gatestrength-p)."
:result (vl-gatestrength-p val)
:resultp-of-nil nil
:fails gracefully
:count strong
(seq tokstream
(:= (vl-match-token :vl-lparen))
(first := (vl-match-some-token *vl-ds0/1-keywords*))
(:= (vl-match-token :vl-comma))
(second := (vl-match-some-token *vl-ds0/1-keywords*))
(:= (vl-match-token :vl-rparen))
(return-raw
(b* (((mv s-zero s-one)
;; Sort them so that we know which is the strength0.
(if (member-eq (vl-token->type first) *vl-ds0-keywords*)
(mv (vl-token->type first)
(vl-token->type second))
(mv (vl-token->type second)
(vl-token->type first))))
;; Now make sure there isn't an illegal combination.
((when (and (member-eq s-zero *vl-ds0-keywords*)
(member-eq s-one *vl-ds1-keywords*)
(or (not (eq s-zero :vl-kwd-highz0))
(not (eq s-one :vl-kwd-highz1)))))
;; It's fine. Build a gate strength token.
(mv nil
(make-vl-gatestrength
:zero (cdr (assoc-eq s-zero *vl-ds0-alist*))
:one (cdr (assoc-eq s-one *vl-ds1-alist*)))
tokstream)))
(vl-parse-error "Invalid drive strength.")))))
(defparser vl-parse-optional-drive-strength ()
:short "Never fails. If there's a valid @('drive_strength'), we match it and
return a @(see vl-gatestrength-p). Otherwise, we don't do anything to the
token list and just return nil."
:result (vl-maybe-gatestrength-p val)
:resultp-of-nil t
:fails never
:count strong-on-value
(b* ((backup (vl-tokstream-save))
((mv erp val tokstream) (vl-parse-drive-strength))
((unless erp)
(mv erp val tokstream))
(tokstream (vl-tokstream-restore backup)))
;; Don't do anything to the token list, just return nil.
(mv nil nil tokstream)))
(defval *vl-charge-strengths-alist*
:showval t
'((:vl-kwd-small . :vl-small)
(:vl-kwd-medium . :vl-medium)
(:vl-kwd-large . :vl-large)))
(defval *vl-charge-strengths-keywords*
:showval t
(strip-cars *vl-charge-strengths-alist*))
(defparser vl-parse-charge-strength ()
:short "Match @('charge_strength'), return a @(see vl-cstrength-p)."
:result (vl-cstrength-p val)
:resultp-of-nil nil
:fails gracefully
:count strong
(seq tokstream
(:= (vl-match-token :vl-lparen))
(cstr := (vl-match-some-token *vl-charge-strengths-keywords*))
(:= (vl-match-token :vl-rparen))
(return (cdr (assoc-eq (vl-token->type cstr)
*vl-charge-strengths-alist*)))))
(defparser vl-parse-drive-strength-or-charge-strength ()
:short "Match @('drive_strength') or @('charge_strength'), returning
a @(see vl-gatestrength-p) or a @(see vl-cstrength-p)."
:resultp-of-nil nil
:fails gracefully
:count strong
(b* (((mv ?erp val tokstream) (vl-parse-optional-drive-strength))
((when val)
(mv nil val tokstream)))
(vl-parse-charge-strength))
///
(defthm vl-parse-drive-strength-or-charge-strength-forward
(or (vl-gatestrength-p
(mv-nth 1 (vl-parse-drive-strength-or-charge-strength)))
(vl-cstrength-p
(mv-nth 1 (vl-parse-drive-strength-or-charge-strength)))
(mv-nth 0 (vl-parse-drive-strength-or-charge-strength)))
:rule-classes ((:forward-chaining
:trigger-terms
((vl-parse-drive-strength-or-charge-strength))))
:hints(("Goal"
:in-theory (enable vl-parse-drive-strength-or-charge-strength)))))
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