X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/323010d1c247d0097b2cdc79d1da143846461999..ee8d653e61f6bf76330b44acf9ded13fa9a89dcc:/src/kernel/context/context_private.hpp

diff --git a/src/kernel/context/context_private.hpp b/src/kernel/context/context_private.hpp
index b682232eb8..0bf2a78b0f 100644
--- a/src/kernel/context/context_private.hpp
+++ b/src/kernel/context/context_private.hpp
@@ -1,4 +1,4 @@
-/* Copyright (c) 2017-2018. The SimGrid Team. All rights reserved.          */
+/* Copyright (c) 2017-2019. The SimGrid Team. All rights reserved.          */
 
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
@@ -20,4 +20,14 @@
 #define ASAN_FINISH_SWITCH(fake_stack_save, bottom_old, size_old) (void)0
 #endif
 
+/* We are using the bottom of the stack to save some information, like the
+ * valgrind_stack_id. Define smx_context_usable_stack_size to give the remaining
+ * size for the stack. Round its value to a multiple of 16 (asan wants the stacks to be aligned this way). */
+#if HAVE_VALGRIND_H
+#define smx_context_usable_stack_size                                                                                  \
+  ((smx_context_stack_size - sizeof(unsigned int)) & ~0xf) /* for valgrind_stack_id */
+#else
+#define smx_context_usable_stack_size (smx_context_stack_size & ~0xf)
+#endif
+
 #endif