From 7ff117e24a97ce98ac13671ea140c45a67400b5d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= Date: Fri, 21 May 2010 16:00:21 +0200 Subject: Add erlang:nif_error/1,2 A stub function that is supposed to be replaced by a NIF usually calls erlang:error/1 to cause an exception if the NIF library is not loaded. For example: foo() -> erlang:error(nif_not_loaded). The problem is that although erlang:error/1 will normally never be called, Dialyzer will think that any call to the function will fail and thus generate false warnings. Adding a spec for the function will not help because Dialyzer will not believe the spec. Add erlang:nif_error/1,2 that work exactly like erlang:error/1,2. Define the return types for both BIFs to be t_any(). erlang:nif_error is used like this: -spec foo() -> binary(). foo() -> erlang:nif_error(nif_not_loaded). (The -spec is optional but highly recommended, since Dialyzer otherwise has no chance to figure out the types.) --- erts/emulator/beam/bif.tab | 3 +++ 1 file changed, 3 insertions(+) (limited to 'erts/emulator/beam/bif.tab') diff --git a/erts/emulator/beam/bif.tab b/erts/emulator/beam/bif.tab index 9feb302a3d..e4713567de 100644 --- a/erts/emulator/beam/bif.tab +++ b/erts/emulator/beam/bif.tab @@ -793,6 +793,9 @@ bif binary:encode_unsigned/2 bif binary:decode_unsigned/1 bif binary:decode_unsigned/2 +bif erlang:nif_error/1 +bif erlang:nif_error/2 + # # Obsolete # -- cgit v1.2.3