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-rw-r--r--erts/emulator/beam/erl_vm.h17
1 files changed, 15 insertions, 2 deletions
diff --git a/erts/emulator/beam/erl_vm.h b/erts/emulator/beam/erl_vm.h
index f97716d030..899e2a275a 100644
--- a/erts/emulator/beam/erl_vm.h
+++ b/erts/emulator/beam/erl_vm.h
@@ -110,8 +110,21 @@
#define HeapWordsLeft(p) (HEAP_LIMIT(p) - HEAP_TOP(p))
#if defined(DEBUG) || defined(CHECK_FOR_HOLES)
-# define ERTS_HOLE_MARKER (((0xdeadbeef << 24) << 8) | 0xdeadbeef)
-#endif /* egil: 32-bit ? */
+
+/*
+ * ERTS_HOLE_MARKER must *not* be mistaken for a valid term
+ * on the heap...
+ */
+# ifdef ARCH_64
+# define ERTS_HOLE_MARKER \
+ make_catch(UWORD_CONSTANT(0xdeadbeaf00000000) >> _TAG_IMMED2_SIZE)
+/* Will (at the time of writing) appear as 0xdeadbeaf0000001b */
+# else
+# define ERTS_HOLE_MARKER \
+ make_catch(UWORD_CONSTANT(0xdead0000) >> _TAG_IMMED2_SIZE)
+/* Will (at the time of writing) appear as 0xdead001b */
+# endif
+#endif
/*
* Allocate heap memory on the ordinary heap, NEVER in a heap