commit 84071590b3d76a647fe9cd9055a089605fedc219
author Jeff Epler <jepler@gmail.com> Fri Aug 27 09:02:03 2021 -0500
committer Damien George <damien@micropython.org> Thu Dec 08 14:29:22 2022 +1100
tree f76c2c4aa4a3f8acfc7c28a669ae0ad762001888
parent 2283b6d68fe77b72e7beeb1bf24778834231b190

py/gc: Avoid valgrind false positives.

When you want to use the valgrind memory analysis tool on MicroPython, you
can arrange to define MICROPY_DEBUG_VALGRIND to enable use of special
valgrind macros.  For now, this only fixes `gc_get_ptr` so that it never
emits the diagnostic "Conditional jump or move depends on uninitialised
value(s)".

Signed-off-by: Jeff Epler <jepler@gmail.com>

py/mpconfig.h

diff --git a/py/mpconfig.h b/py/mpconfig.h
index 765a8f4..564580c 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -510,6 +510,11 @@
 #define MICROPY_DEBUG_VM_STACK_OVERFLOW (0)
 #endif
 
+// Whether to enable extra instrumentation for valgrind
+#ifndef MICROPY_DEBUG_VALGRIND
+#define MICROPY_DEBUG_VALGRIND (0)
+#endif
+
 /*****************************************************************************/
 /* Optimisations                                                             */