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• Parser
• Parse-exprs/decls/stmts

Parse-declarator-or-abstract-declarator

Parse a declarator or an abstract declarator.

Signature

(parse-declarator-or-abstract-declarator parstate) 
  → 
(mv erp declor/absdeclor span new-parstate)

Arguments

parstate — Guard (parstatep parstate).

Returns

declor/absdeclor — Type (amb?-declor/absdeclor-p declor/absdeclor).

span — Type (spanp span).

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

This is called when expecting either a declarator or an abstract declarator (this happens in a parameter declaration, after establishing that the parameter declarator is present). Thus, this parsing function returns a possibly ambiguous declarator or abstract declarator.

We try to parse both a declarator and an abstract declarator, using the checkpointing and backtracking feature. If only one succeeds, there is no ambiguity, and we return either a declarator or an abstract declarator (wrapped). If both succeed, there is an ambiguity, which we return as such. If none succeeds, it is an error.

A complication is that an abstract declarator may be a prefix of a declarator, e.g. int * is a prefix of int *x. In this case, we can disambiguate the situation in favor or a declarator, exploiting the fact that an ambiguous declarator or abstract declarator only occurs in a parameter declaration, which is always followed by a comma or closed parenthesis, or by an attribute if GCC extensions are enabled. So, if we successfully parse an abstract declarator, we also ensure that the next token is a comma or closed parenthesis or attribute keyword, otherwise we regard the parsing of the abstract declarator to have failed.