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authorAndy Wingo <wingo@pobox.com>2013-06-27 18:49:21 +0200
committerAndy Wingo <wingo@pobox.com>2013-06-27 22:02:43 +0200
commitbb97e4abd49e8094e9eb8bf767c696bf7ee1ba7e (patch)
tree4a266c032b794c87f7ebd8f8101339b21f51607d /module/language/tree-il/peval.scm
parent0fcc39a0a962e44d509dbb659529165c7ce5b91d (diff)
downloadguile-bb97e4abd49e8094e9eb8bf767c696bf7ee1ba7e.tar.gz
dynamic-wind in terms of wind and unwind; remove <dynwind>, @dynamic-wind
* doc/ref/compiler.texi: Remove mention of <dynwind>. * libguile/eval.c (eval): Remove SCM_M_DYNWIND case. * libguile/expand.c: Remove scm_sym_at_dynamic_wind. * libguile/memoize.c (do_wind, do_unwind): A couple of hacky subrs. If we see a wind or unwind primcall, we expand to a call of a quoted subr value. It works and removes a kind of memoized value from the interpreter. For the compiler,primcalls to wind and unwind are handled specially. (MAKMEMO_DYNWIND): Remove. (scm_tc16_memoizer): Remove. Yay! (memoize): Remove speculative lookup for toplevels to see if they are memoizers: there are no more memoizers. Memoize calls to the wind and unwind primitives. (m_dynamic_wind): Remove. (unmemoize): Remove dynwind case. (scm_init_memoize): Add wind and unwind local definitions. * module/ice-9/boot-9.scm (dynamic-wind): Reimplement in terms of "wind" and "unwind" primitives. These primitives are not exposed to other modules. * module/ice-9/eval.scm (primitive-eval): Remove dynwind case. * module/language/scheme/decompile-tree-il.scm (do-decompile): (choose-output-names): Remove dynwind cases. * module/language/tree-il.scm: Remove <dynwind>. Yaaay! * module/language/tree-il/analyze.scm (analyze-lexicals): Remove dynwind cases. * module/language/tree-il/compile-glil.scm (*primcall-ops*): Add wind and unwind. (flatten-lambda-case): Remove dynwind case. Yay! * module/language/tree-il/cse.scm (cse): * module/language/tree-il/debug.scm (verify-tree-il): * module/language/tree-il/effects.scm (make-effects-analyzer): * module/language/tree-il/peval.scm (singly-valued-expression?, peval): Remove <dywind> cases. Inline primcalls to dynamic-wind. Add constant folding for thunk?. * module/language/tree-il/primitives.scm (*interesting-primitive-names*): Remove @dynamic-wind, and add procedure? and thunk?. (*effect+exception-free-primitives*): Add procedure? and thunk?. (*multiply-valued-primitives*): Remove @dynamic-wind. Remove @dynamic-wind expander. * test-suite/tests/peval.test ("partial evaluation"): Update tests for dynwind desugaring.
Diffstat (limited to 'module/language/tree-il/peval.scm')
-rw-r--r--module/language/tree-il/peval.scm50
1 files changed, 32 insertions, 18 deletions
diff --git a/module/language/tree-il/peval.scm b/module/language/tree-il/peval.scm
index 662adb493..afa92f6de 100644
--- a/module/language/tree-il/peval.scm
+++ b/module/language/tree-il/peval.scm
@@ -104,8 +104,6 @@
(($ <conditional> _ test consequent alternate)
(and (singly-valued-expression? consequent)
(singly-valued-expression? alternate)))
- (($ <dynwind> _ winder body unwinder)
- (singly-valued-expression? body))
(else #f)))
(define (truncate-values x)
@@ -543,10 +541,6 @@ top-level bindings from ENV and return the resulting expression."
(($ <prompt>) #f)
(($ <abort>) #f)
- ;; Bail on dynwinds, as that would cause the consumer to run in
- ;; the wrong dynamic context.
- (($ <dynwind>) #f)
-
;; Propagate to tail positions.
(($ <let> src names gensyms vals body)
(let ((body (loop body)))
@@ -1002,11 +996,6 @@ top-level bindings from ENV and return the resulting expression."
(else #f))))
(_ #f))
(make-let-values lv-src producer (for-tail consumer)))))
- (($ <dynwind> src winder body unwinder)
- (make-dynwind src
- (for-value winder)
- (for-tail body)
- (for-value unwinder)))
(($ <dynlet> src fluids vals body)
(make-dynlet src (map for-value fluids) (map for-value vals)
(for-tail body)))
@@ -1169,13 +1158,29 @@ top-level bindings from ENV and return the resulting expression."
(list w u) 2
(match-lambda
((w u)
- (make-seq src
- (make-call src w '())
- (make-begin0 src
- (make-dynwind src w
- (make-call src thunk '())
- u)
- (make-call src u '()))))))))
+ (make-seq
+ src
+ (make-seq
+ src
+ (make-conditional
+ src
+ ;; fixme: introduce logic to fold thunk?
+ (make-primcall src 'thunk? (list u))
+ (make-call src w '())
+ (make-primcall
+ src 'scm-error
+ (list
+ (make-const #f 'wrong-type-arg)
+ (make-const #f "dynamic-wind")
+ (make-const #f "Wrong type (expecting thunk): ~S")
+ (make-primcall #f 'list (list u))
+ (make-primcall #f 'list (list u)))))
+ (make-primcall src 'wind (list w u)))
+ (make-begin0 src
+ (make-call src thunk '())
+ (make-seq src
+ (make-primcall src 'unwind '())
+ (make-call src u '())))))))))
(($ <primcall> src 'values exps)
(cond
@@ -1244,6 +1249,15 @@ top-level bindings from ENV and return the resulting expression."
((name . args)
(make-primcall src name args))))))
+ (($ <primcall> src 'thunk? (proc))
+ (match (for-value proc)
+ (($ <lambda> _ _ ($ <lambda-case> _ req))
+ (for-tail (make-const src (null? req))))
+ (proc
+ (case ctx
+ ((effect) (make-void src))
+ (else (make-primcall src 'thunk? (list proc)))))))
+
(($ <primcall> src (? accessor-primitive? name) args)
(match (cons name (map for-value args))
;; FIXME: these for-tail recursions could take place outside