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03/05: utils: Micro-optimize 'source-properties->location'.
From: |
Ludovic Courtès |
Subject: |
03/05: utils: Micro-optimize 'source-properties->location'. |
Date: |
Mon, 2 Jul 2018 09:28:42 -0400 (EDT) |
civodul pushed a commit to branch master
in repository guix.
commit 223fa5b327b0892cf45d22e4a9fbfb06164e409d
Author: Ludovic Courtès <address@hidden>
Date: Mon Jul 2 14:49:14 2018 +0200
utils: Micro-optimize 'source-properties->location'.
* guix/utils.scm (source-properties->location): Destructure LOC with
'match', adding a fast path without 'assq-ref' calls.
---
guix/utils.scm | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/guix/utils.scm b/guix/utils.scm
index 9fbb95d..f934b6e 100644
--- a/guix/utils.scm
+++ b/guix/utils.scm
@@ -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,