Import guile-1.8 as multiple upstream tarball component

[lilypond.git] / guile18 / test-suite / standalone / test-scm-with-guile.c

diff --git a/guile18/test-suite/standalone/test-scm-with-guile.c b/guile18/test-suite/standalone/test-scm-with-guile.c
new file mode 100644 (file)
index 0000000..7fe16b3
--- /dev/null
+++ b/guile18/test-suite/standalone/test-scm-with-guile.c
@@ -0,0 +1,66 @@
+/* Copyright (C) 2008 Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+/* Test whether `scm_with_guile ()' can be called several times from a given
+   thread, but from a different stack depth.  Up to 1.8.5, `scm_with_guile
+   ()' would not update the thread's `base' field, which would then confuse
+   the GC.
+
+   See http://lists.gnu.org/archive/html/guile-devel/2008-11/msg00037.html
+   for a detailed report.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <libguile.h>
+
+static void *
+entry_point (void *arg)
+{
+  /* Invoke the GC.  If `THREAD->base' is incorrect, then Guile will just
+     segfault somewhere in `scm_mark_locations ()'.  */
+  scm_gc ();
+
+  return NULL;
+}
+
+static void
+go_deeper_into_the_stack (unsigned level)
+{
+  /* The assumption is that the compiler is not smart enough to optimize this
+     out.  */
+  if (level > 0)
+    go_deeper_into_the_stack (level - 1);
+  else
+    scm_with_guile (entry_point, NULL);
+}
+
+\f
+int
+main (int argc, char *argv[])
+{
+  /* Invoke `scm_with_guile ()' from someplace deep into the stack.  */
+  go_deeper_into_the_stack (100);
+
+  /* Invoke it from much higher into the stack.  This time, Guile is expected
+     to update the `base' field of the current thread.  */
+  scm_with_guile (entry_point, NULL);
+
+  return 0;
+}