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• Parser

Token-struct-declaration-start-p

Check if an optional token may start a structure declaration.

Signature

(token-struct-declaration-start-p token? gcc) → yes/no

Arguments

token? — Guard (token-optionp token?).

gcc — Guard (booleanp gcc).

Returns

yes/no — Type (booleanp yes/no).

A structure declaration may start with a specifier or qualifier, or with the _Static_assert keyword. If GCC extensions are supported, it may also start with the __extensions__ keyword; note that this is generated by the lexer only if GCC extensions are supported, so this predicate will fail if GCC extensions are not supported and the token is __extension__, which must be an identifier if GCC extensions are not supported.

If GCC extensions are supported, which is indicated by the boolean flag passed as input, we also include semicolons, for empty structure declarations.

Definitions and Theorems

Function: token-struct-declaration-start-p

(defun token-struct-declaration-start-p (token? gcc)
  (declare (xargs :guard (and (token-optionp token?)
                              (booleanp gcc))))
  (let ((__function__ 'token-struct-declaration-start-p))
    (declare (ignorable __function__))
    (or (token-specifier/qualifier-start-p token?)
        (token-keywordp token? "_Static_assert")
        (token-keywordp token? "__extension__")
        (and gcc (token-punctuatorp token? ";")))))

Theorem: booleanp-of-token-struct-declaration-start-p

(defthm booleanp-of-token-struct-declaration-start-p
  (b* ((yes/no (token-struct-declaration-start-p token? gcc)))
    (booleanp yes/no))
  :rule-classes :rewrite)

Theorem: non-nil-when-token-strut-declaration-start-p

(defthm non-nil-when-token-strut-declaration-start-p
  (implies (token-struct-declaration-start-p token? gcc)
           token?)
  :rule-classes :forward-chaining)