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avoid generating macro definition; use compile-time helper instead

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This commit is contained in:
Ryan Culpepper 2018-02-15 21:52:43 +01:00
parent f6424ff7c2
commit 778b184526
1 changed files with 52 additions and 32 deletions
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84
racket/collects/ffi/unsafe/define.rkt
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@ -27,6 +27,50 @@
(define-syntax-rule (provide-protected p ...) (define-syntax-rule (provide-protected p ...)
(provide (protect-out p ...))) (provide (protect-out p ...)))
(begin-for-syntax
(define (make-ffi-definer-transformer the-ffi-lib ;; Identifier
provide-form ;; Identifier/#'#f
define-form ;; Identifier
default-make-fail ;; Identifier
make-c-id) ;; Identifier/#'#f
;; do-make-c-id : Identifier -> Identifier
(define (do-make-c-id id)
(cond [(identifier? make-c-id)
(define result ((syntax-local-value make-c-id) id))
(unless (identifier? result)
(raise-syntax-error #f "invalid make-c-id result" make-c-id))
result]
[else id]))
(with-syntax ([the-ffi-lib the-ffi-lib]
[provide provide-form]
[define-form define-form]
[default-make-fail default-make-fail])
(lambda (stx)
(syntax-parse stx
[(_ s-id:id type:expr
(~seq (~or (~optional (~seq #:c-id c-id:id)
#:defaults ([c-id (do-make-c-id #'s-id)])
#:name "#:c-id keyword")
(~optional (~seq #:wrap wrapper:expr)
#:defaults ([wrapper #'values])
#:name "#:wrap keyword")
(~optional (~or (~seq #:make-fail make-fail:expr)
(~seq #:fail fail:expr))
#:defaults ([make-fail #'default-make-fail])))
...))
(with-syntax ([fail (if (attribute fail)
#'fail
#'(make-fail 's-id))])
(with-syntax ([def (syntax/loc stx
(define-form s-id
(wrapper (get-ffi-obj 'c-id the-ffi-lib type fail))))])
(if (syntax-e #'provide)
(syntax/loc stx
(begin
(provide s-id)
def))
#'def)))])))))
(define-syntax (define-ffi-definer stx) (define-syntax (define-ffi-definer stx)
(syntax-parse stx (syntax-parse stx
[(_ define-:id ffi-lib:expr [(_ define-:id ffi-lib:expr
@ -51,35 +95,11 @@
(raise-type-error 'define-ffi-definer (raise-type-error 'define-ffi-definer
"ffi-lib or #f" "ffi-lib or #f"
v)))) v))))
(define-syntax define- (define the-default-make-fail default-make-fail)
(with-syntax ([provide #'provide-form]) (define-syntax define-
(lambda (stx) (make-ffi-definer-transformer
(syntax-parse stx (quote-syntax the-ffi-lib)
[(_ s-id:id type:expr (~seq (~or (~optional (~seq #:c-id c-id:id) (quote-syntax provide-form)
#:defaults ([c-id #,(if (identifier? (attribute make-c-id)) (quote-syntax define-form)
#'((syntax-local-value #'make-c-id) #'s-id) (quote-syntax the-default-make-fail)
#'#'s-id)]) (quote-syntax make-c-id))))]))
#:name "#:c-id keyword")
(~optional (~seq #:wrap wrapper:expr)
#:defaults ([wrapper #'values])
#:name "#:wrap keyword")
(~optional (~or (~seq #:make-fail make-fail:expr)
(~seq #:fail fail:expr))
#:defaults ([make-fail #'default-make-fail])))
(... ...)))
(unless (identifier? #'c-id)
(raise-syntax-error #f
"invalid make-c-id expression"
#'make-c-id))
(with-syntax ([fail (if (attribute fail)
#'fail
#'(make-fail 's-id))])
(with-syntax ([def (syntax/loc stx
(define-form s-id (wrapper (get-ffi-obj 'c-id the-ffi-lib type fail))))])
(if (syntax-e #'provide)
(syntax/loc stx
(begin
(provide s-id)
def))
#'def)))])))))]))