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authorLudovic Courtès <ludo@gnu.org>2014-10-18 18:19:08 +0200
committerLudovic Courtès <ludo@gnu.org>2016-03-08 00:01:13 +0100
commit198d84b70bd26af1994c01fa1429f0e88991e896 (patch)
tree95f94c0a9ec0b191e0d49b795ecfe1626c27f7f8 /guix
parentef7516aa049462b44f99ba7479769c6831715734 (diff)
packages: Generalize the 'cached' macro.
* guix/packages.scm (cache): Rename to... (cache!): ... this. Add 'cache' parameter, and use it. (cached): Add a rule to allow the cache to be specified.
Diffstat (limited to 'guix')
-rw-r--r--guix/packages.scm37
1 files changed, 20 insertions, 17 deletions
diff --git a/guix/packages.scm b/guix/packages.scm
index 1769238b5e..ee62c8442a 100644
--- a/guix/packages.scm
+++ b/guix/packages.scm
@@ -727,8 +727,8 @@ dependencies are known to build on SYSTEM."
;; Package to derivation-path mapping.
(make-weak-key-hash-table 100))
-(define (cache package system thunk)
- "Memoize the return values of THUNK as the derivation of PACKAGE on
+(define (cache! cache package system thunk)
+ "Memoize in CACHE the return values of THUNK as the derivation of PACKAGE on
SYSTEM."
;; FIXME: This memoization should be associated with the open store, because
;; otherwise it breaks when switching to a different store.
@@ -736,26 +736,29 @@ SYSTEM."
;; Use `hashq-set!' instead of `hash-set!' because `hash' returns the
;; same value for all structs (as of Guile 2.0.6), and because pointer
;; equality is sufficient in practice.
- (hashq-set! %derivation-cache package
+ (hashq-set! cache package
`((,system ,@vals)
- ,@(or (hashq-ref %derivation-cache package)
- '())))
+ ,@(or (hashq-ref cache package) '())))
(apply values vals)))
-(define-syntax-rule (cached package system body ...)
- "Memoize the result of BODY for the arguments PACKAGE and SYSTEM.
+(define-syntax cached
+ (syntax-rules (=>)
+ "Memoize the result of BODY for the arguments PACKAGE and SYSTEM.
Return the cached result when available."
- (let ((thunk (lambda () body ...))
- (key system))
- (match (hashq-ref %derivation-cache package)
- ((alist (... ...))
- (match (assoc-ref alist key)
- ((vals (... ...))
- (apply values vals))
+ ((_ (=> cache) package system body ...)
+ (let ((thunk (lambda () body ...))
+ (key system))
+ (match (hashq-ref cache package)
+ ((alist (... ...))
+ (match (assoc-ref alist key)
+ ((vals (... ...))
+ (apply values vals))
+ (#f
+ (cache! cache package key thunk))))
(#f
- (cache package key thunk))))
- (#f
- (cache package key thunk)))))
+ (cache! cache package key thunk)))))
+ ((_ package system body ...)
+ (cached (=> %derivation-cache) package system body ...))))
(define* (expand-input store package input system #:optional cross-system)
"Expand INPUT, an input tuple, such that it contains only references to