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Re: resolving anonymous procedures in statprof

From: Ludovic Courtès
Subject: Re: resolving anonymous procedures in statprof
Date: Thu, 05 Mar 2020 22:32:04 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)

Hi Christopher,

Christopher Howard <address@hidden> skribis:

> Hi, Guile's statprof utility is very helpful, but a lot of my output
> lines point to anonymous procedures like "anon #x1db7d38". Is there a
> way to figure out which specific lambdas those are referring to? In
> principle it seems like I should be able to figure that out by running
> the dissembler (,x) on the code I am profiling with statprof, but the
> addresses given by the dissassembler do not match the ones given by
> statprof.

I had the very same question not long ago actually.  :-)

I fiddled a bit to see how it could be that Guile couldn’t figure out
debugging info for a code snippet, to no avail (on Guile 3).  For
instance, the attached snippet didn’t seem to have any effect.

Any ideas, Andy?


diff --git a/module/statprof.scm b/module/statprof.scm
index 33eac4468..dc057eb20 100644
--- a/module/statprof.scm
+++ b/module/statprof.scm
@@ -388,8 +388,13 @@ always collects full stacks.)"
 (define (addr->printable addr pdi)
-  (or (and=> (and=> pdi program-debug-info-name) symbol->string)
-      (string-append "anon #x" (number->string addr 16))))
+  (or (and=> pdi program-debug-info-name)
+      (let ((base (string-append "anon #x"
+                                 (number->string addr 16)))
+            (loc  (find-source-for-addr addr)))
+        (if loc
+            (string-append base ":" (source->string loc))
+            base))))
 (define (inc-call-data-cum-sample-count! cd)
   (set-call-data-cum-sample-count! cd (1+ (call-data-cum-sample-count cd))))

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