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Automatically create fluids when necessary.

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* module/language/elisp/README: Document that.
* module/language/elisp/compile-tree-il.scm: Create fluids when necessary.
* module/language/elisp/runtime/function-slot.scm: Fix module name.
This commit is contained in:
Daniel Kraft 2009-07-13 17:26:07 +02:00
parent cef997e82a
commit f28de79197
3 changed files with 35 additions and 24 deletions
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4
module/language/elisp/README
View file

@ -20,9 +20,7 @@ Especially still missing:
* dolist, dotimes using macros
* catch/throw, unwind-protect
* real elisp reader instead of Scheme's
* set based on setq
* makunbound, boundp
* automatic creation of fluids when needed
* set, makunbound, boundp functions
* macros
* general primitives (+, -, *, cons, ...)
* funcall and apply

21
module/language/elisp/compile-tree-il.scm
View file

@ -71,8 +71,19 @@
; is a routine for convenience (needed with let, let*, lambda).
(define (ensure-fluid! loc sym module)
; FIXME: Do this!
(make-void loc))
(let ((resolved-module (call-primitive loc 'resolve-module
(make-const loc module))))
(make-conditional loc
(call-primitive loc 'module-defined? resolved-module (make-const loc sym))
(make-void loc)
(make-sequence loc
(list (call-primitive loc 'module-define!
resolved-module (make-const loc sym)
(call-primitive loc 'make-fluid))
(call-primitive loc 'module-export!
resolved-module
(call-primitive loc 'list (make-const loc sym))))))))
(define (ensure-fluids-for loc syms module . body)
(make-sequence loc
@ -349,6 +360,7 @@
(not (null? bindings))
(not (null? body))))
(let ((bind (process-let-bindings loc bindings)))
(ensure-fluids-for loc (map car bind) value-slot
(call-primitive loc 'with-fluids*
(make-application loc (make-primitive-ref loc 'list)
(map (lambda (el)
@ -359,7 +371,7 @@
(compile-expr (cdr el)))
bind))
(make-lambda loc '() '() '()
(make-sequence loc (map compile-expr body))))))
(make-sequence loc (map compile-expr body)))))))
; Let* is compiled to a cascaded set of with-fluid* for each binding in turn
; so that each one already sees the preceding bindings.
@ -368,13 +380,14 @@
(not (null? bindings))
(not (null? body))))
(let ((bind (process-let-bindings loc bindings)))
(ensure-fluids-for loc (map car bind) value-slot
(let iterate ((tail bind))
(if (null? tail)
(make-sequence loc (map compile-expr body))
(call-primitive loc 'with-fluid*
(make-module-ref loc value-slot (caar tail) #t)
(compile-expr (cdar tail))
(make-lambda loc '() '() '() (iterate (cdr tail))))))))
(make-lambda loc '() '() '() (iterate (cdr tail)))))))))
; A while construct is transformed into a tail-recursive loop like this:
; (letrec ((iterate (lambda ()

2
module/language/elisp/runtime/function-slot.scm
View file

@ -19,6 +19,6 @@
;;; Code:
(define-module (language elisp runtime value-slot))
(define-module (language elisp runtime function-slot))
; This module contains the function-slots of elisp symbols.