Subject: Missing modules argument for coverage-data->lcov
From: Jessica Tallon <[email-masked]>
To: [email-masked]
Date: Wed, 13 Apr 2022 16:01:27 +0200
List-Id: <debbugs-submit.debbugs.gnu.org>

Hello,

I noticed the documentation specify that the `coverage-data->lcov`
function should be able to take modules to limit the scope of the data
that's coverted to lcov. From the docs:

 -- Scheme Procedure: coverage-data->lcov data port #:key modules
     Traverse code coverage information DATA, as obtained with
     ‘with-code-coverage’, and write coverage information to port in the
     ‘.info’ format used by LCOV
     (http://ltp.sourceforge.net/coverage/lcov.php).  The report will
     include all of MODULES (or, by default, all the currently loaded
     modules) even if their code was not executed.

However I noticed that this didn't match the code. I've attached a patch
which implements the behavour described in the docs.

Thanks,
Jessica.

From 828daf200539d3a642fcf8210df7b58aa0d5fede Mon Sep 17 00:00:00 2001
From: Jessica Tallon <[email-masked]>
Date: Wed, 13 Apr 2022 15:57:24 +0200
Subject: [PATCH] Fix missing modules argument for coverage-data->lcov

The code coverage function `coverage-data->lcov` has a documented
`modules` argument, however that was missing from the source. I have
added it so when supplied it only converts the coverage data for the
supplied modules. If not supplied it defaults the old behavour of
including all the modules currently loaded.
---
 module/system/vm/coverage.scm | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/module/system/vm/coverage.scm b/module/system/vm/coverage.scm
index 0d51e261a..f1d65cc6c 100644
--- a/module/system/vm/coverage.scm
+++ b/module/system/vm/coverage.scm
@@ -300,7 +300,7 @@ was loaded at the time DATA was collected."
 ;;; LCOV output.
 ;;;
 
-(define* (coverage-data->lcov data port)
+(define* (coverage-data->lcov data port #:key (modules #f))
   "Traverse code coverage information DATA, as obtained with
 `with-code-coverage', and write coverage information in the LCOV format to PORT.
 The report will include all the modules loaded at the time coverage data was
@@ -325,6 +325,12 @@ gathered, even if their code was not executed."
 
   ;; Output per-file coverage data.
   (format port "TN:~%")
+  (define source-files
+    (filter
+     (lambda (file)
+       (or (not modules) (member file modules)))
+     (instrumented-source-files data)))
+
   (for-each (lambda (file)
               (let ((path (search-path %load-path file)))
                 (if (string? path)
@@ -345,6 +351,6 @@ gathered, even if their code was not executed."
                       (format port "end_of_record~%"))
                     (begin
                       (format (current-error-port)
-                              "skipping unknown source file: ~a~%"
+                              "skipping source file: ~a~%"
                               file)))))
-            (instrumented-source-files data)))
+            source-files))
-- 
2.35.1