[Guile-commits] GNU Guile branch, stable-2.0, updated. v2.0.3-209-g9c5d7fa

[Andy Wingo]

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- Log -----------------------------------------------------------------
commit 9c5d7fa6714e2c8f5e808cdc211f6bd0c1cd49d6
Author: Andy Wingo <address@hidden>
Date:   Sun Jan 29 22:45:56 2012 +0100

    paper over some "lexical vars are collectable" flakiness
    
    * test-suite/tests/gc.test ("gc"): Hack around flakiness in "lexical
      vars are collectable" on some architectures.

-----------------------------------------------------------------------

Summary of changes:
 test-suite/tests/gc.test |   34 +++++++++++++++++++++++-----------
 1 files changed, 23 insertions(+), 11 deletions(-)

diff --git a/test-suite/tests/gc.test b/test-suite/tests/gc.test
index 527bef5..97eeb19 100644
--- a/test-suite/tests/gc.test
+++ b/test-suite/tests/gc.test
@@ -87,14 +87,26 @@
          total)))
 
   (pass-if "Lexical vars are collectable"
-    (list?
-     (compile
-      '(begin
-         (define guardian (make-guardian))
-         (let ((f (list 'foo)))
-           ;; Introduce a useless second reference to f to prevent the
-           ;; optimizer from propagating the lexical binding.
-           f
-           (guardian f))
-         (gc)(gc)(gc)
-         (guardian))))))
+    (let ((l (compile
+              '(begin
+                 (define guardian (make-guardian))
+                 (let ((f (list 'foo)))
+                   (guardian f))
+                 ;; See below.
+                 ;; ((lambda () #t))
+                 (gc)(gc)(gc)
+                 (guardian))
+              ;; Prevent the optimizer from propagating f.
+              #:opts '(#:partial-eval? #f))))
+      (if (not l)
+          ;; We think that something on the C stack in the VM is holding
+          ;; on to a reference to the list.  This happens on
+          ;; register-poor architectures, where more locals are spilled
+          ;; to the stack.  If more code runs before the (gc) is run,
+          ;; like a ((lambda () #t)), then the test passes.  So given
+          ;; that at some point, the reference will be dropped, we will
+          ;; count these cases as "unresolved" instead of "fail".
+          ;;
+          ;; See http://debbugs.gnu.org/cgi/bugreport.cgi?bug=10336.
+          (throw 'unresolved)
+          (equal? l '(foo))))))


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