Merge branch 'rickard/magic-references'

OTP-14205

* rickard/magic-references:
  Add binary overhead for magic ref/binaries
  Adjust the only usage of exposed magic binaries
  Use magic refs for maps merge trap context
  Use magic refs binary_to_term/term_to_binary trap context
  Use magic refs for distributed send trap context
  Use magic refs for unicode static NIFs traps
  Use magic refs for binary compile patterns
  Use magic refs for list_to_binary/binary_to_list traps
  Use magic refs for compiled match specs
  Use magic refs for re:run() static NIFs trap
  Use magic refs for code loading state
  Use magic refs in trapping processes()/ports() BIFs
  Use magic refs for NIF resources
  Implement magic references
  Implement erts_refc_inc_unless()

1 files changed, 5 insertions, 0 deletions

diff --git a/erts/emulator/beam/erl_message.c b/erts/emulator/beam/erl_message.c
index 5e160de080..f181c1e3cb 100644
--- a/erts/emulator/beam/erl_message.c
+++ b/erts/emulator/beam/erl_message.c
@@ -176,6 +176,11 @@ erts_cleanup_offheap(ErlOffHeap *offheap)
 		erts_erase_fun_entry(u.fun->fe);		    
 	    }
 	    break;
+	case REF_SUBTAG:
+	    ASSERT(is_magic_ref_thing(u.hdr));
+	    if (erts_refc_dectest(&u.mref->mb->refc, 0) == 0)
+		erts_bin_free((Binary *)u.mref->mb);		    
+	    break;
 	default:
 	    ASSERT(is_external_header(u.hdr->thing_word));
 	    erts_deref_node_entry(u.ext->node);