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• Parser

Parse-*-label-declaration

Parse a list of zero or more label declarations.

Signature

(parse-*-label-declaration parstate) 
  → 
(mv erp labelss span new-parstate)

Arguments

parstate — Guard (parstatep parstate).

Returns

labelss — Type (ident-list-listp labelss).

span — Type (spanp span).

new-parstate — Type (parstatep new-parstate), given (parstatep parstate).

That is, we parse a *label-declaration, in ABNF notation.

If the next token is not the __label__ keyword (which is a keyword only when GCC extensions are enabled), we return the empty list of lists of identifiers and an irrelevant span. Otherwise, we parse the rest of the label declaration, and then we recursively parse zero or more additional label declarations.

Definitions and Theorems

Function: parse-*-label-declaration

(defun parse-*-label-declaration (parstate)
  (declare (xargs :stobjs (parstate)))
  (declare (xargs :guard (parstatep parstate)))
  (let ((__function__ 'parse-*-label-declaration))
    (declare (ignorable __function__))
    (b* (((reterr) nil (irr-span) parstate)
         ((erp token span parstate)
          (read-token parstate))
         ((unless (token-keywordp token "__label__"))
          (b* ((parstate (if token (unread-token parstate)
                           parstate)))
            (retok nil (irr-span) parstate)))
         ((erp labels labels-span parstate)
          (parse-label-declaration parstate))
         ((erp labelss labelss-span parstate)
          (parse-*-label-declaration parstate)))
      (retok (cons labels labelss)
             (if labelss (span-join span labelss-span)
               (span-join span labels-span))
             parstate))))

Theorem: ident-list-listp-of-parse-*-label-declaration.labelss

(defthm ident-list-listp-of-parse-*-label-declaration.labelss
  (b* (((mv acl2::?erp ?labelss ?span ?new-parstate)
        (parse-*-label-declaration parstate)))
    (ident-list-listp labelss))
  :rule-classes :rewrite)

Theorem: spanp-of-parse-*-label-declaration.span

(defthm spanp-of-parse-*-label-declaration.span
  (b* (((mv acl2::?erp ?labelss ?span ?new-parstate)
        (parse-*-label-declaration parstate)))
    (spanp span))
  :rule-classes :rewrite)

Theorem: parstatep-of-parse-*-label-declaration.new-parstate

(defthm parstatep-of-parse-*-label-declaration.new-parstate
  (implies (parstatep parstate)
           (b* (((mv acl2::?erp ?labelss ?span ?new-parstate)
                 (parse-*-label-declaration parstate)))
             (parstatep new-parstate)))
  :rule-classes :rewrite)

Theorem: parsize-of-parse-*-label-declaration-uncond

(defthm parsize-of-parse-*-label-declaration-uncond
  (b* (((mv acl2::?erp ?labelss ?span ?new-parstate)
        (parse-*-label-declaration parstate)))
    (<= (parsize new-parstate)
        (parsize parstate)))
  :rule-classes :linear)