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utils: Micro-optimize 'source-properties->location'. 

* guix/utils.scm (source-properties->location): Destructure LOC with
'match', adding a fast path without 'assq-ref' calls.
This commit is contained in:
Ludovic Courtès 2018-07-02 14:49:14 +02:00
parent 3059a35afe
commit 223fa5b327
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1 changed files with 13 additions and 6 deletions
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19
guix/utils.scm
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@ -782,12 +782,19 @@ be determined."
"Return a location object based on the info in LOC, an alist as returned
by Guile's `source-properties', `frame-source', `current-source-location',
etc."
(let ((file (assq-ref loc 'filename))
(line (assq-ref loc 'line))
(col (assq-ref loc 'column)))
;; In accordance with the GCS, start line and column numbers at 1. Note
;; that unlike LINE and `port-column', COL is actually 1-indexed here...
(location file (and line (+ line 1)) col)))
;; In accordance with the GCS, start line and column numbers at 1. Note
;; that unlike LINE and `port-column', COL is actually 1-indexed here...
(match loc
((('line . line) ('column . col) ('filename . file)) ;common case
(and file line col
(make-location file (+ line 1) col)))
(#f
#f)
(_
(let ((file (assq-ref loc 'filename))
(line (assq-ref loc 'line))
(col (assq-ref loc 'column)))
(location file (and line (+ line 1)) col)))))
(define (location->source-properties loc)
"Return the source property association list based on the info in LOC,