From e1f903d5210fb5b91ff47229fb57bf3b0edeb79e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn-Egil=20Dahlberg?= <egil@erlang.org>
Date: Wed, 11 Jun 2014 23:27:06 +0200
Subject: erts: Introduce erlang:fun_info_mfa/1

Introduced for proc_lib:init_p/3
---
 erts/emulator/beam/bif.tab        |  4 ++++
 erts/emulator/beam/erl_bif_info.c | 19 +++++++++++++++++++
 erts/preloaded/src/erlang.erl     | 11 ++++++++++-
 3 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/erts/emulator/beam/bif.tab b/erts/emulator/beam/bif.tab
index 011e49f1fe..e68b8e6274 100644
--- a/erts/emulator/beam/bif.tab
+++ b/erts/emulator/beam/bif.tab
@@ -600,6 +600,10 @@ bif maps:values/1
 
 bif erts_internal:cmp_term/2
 
+#
+# New in 17.1.
+#
+bif erlang:fun_info_mfa/1
 #
 # Obsolete
 #
diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c
index 4d5e55aaf5..faa2655c11 100644
--- a/erts/emulator/beam/erl_bif_info.c
+++ b/erts/emulator/beam/erl_bif_info.c
@@ -3055,6 +3055,25 @@ fun_info_2(BIF_ALIST_2)
     return TUPLE2(hp, what, val);
 }
 
+BIF_RETTYPE
+fun_info_mfa_1(BIF_ALIST_1)
+{
+    Process* p = BIF_P;
+    Eterm fun = BIF_ARG_1;
+    Eterm* hp;
+
+    if (is_fun(fun)) {
+	ErlFunThing* funp = (ErlFunThing *) fun_val(fun);
+	hp = HAlloc(p, 4);
+	BIF_RET(TUPLE3(hp,funp->fe->module,funp->fe->address[-2],make_small(funp->arity)));
+    } else if (is_export(fun)) {
+	Export* exp = (Export *) ((UWord) (export_val(fun))[1]);
+	hp = HAlloc(p, 4);
+	BIF_RET(TUPLE3(hp,exp->code[0],exp->code[1],make_small(exp->code[2])));
+    }
+    BIF_ERROR(p, BADARG);
+}
+
 BIF_RETTYPE is_process_alive_1(BIF_ALIST_1) 
 {
    if(is_internal_pid(BIF_ARG_1)) {
diff --git a/erts/preloaded/src/erlang.erl b/erts/preloaded/src/erlang.erl
index 4ff0513321..98d7a942a6 100644
--- a/erts/preloaded/src/erlang.erl
+++ b/erts/preloaded/src/erlang.erl
@@ -91,7 +91,7 @@
 -export([external_size/2, finish_after_on_load/2, finish_loading/1, float/1]).
 -export([float_to_binary/1, float_to_binary/2,
 	 float_to_list/1, float_to_list/2]).
--export([fun_info/2, fun_to_list/1, function_exported/3]).
+-export([fun_info/2, fun_info_mfa/1, fun_to_list/1, function_exported/3]).
 -export([garbage_collect/0, garbage_collect/1, garbage_collect/2]).
 -export([garbage_collect_message_area/0, get/0, get/1, get_keys/1]).
 -export([get_module_info/1, get_stacktrace/0, group_leader/0]).
@@ -827,6 +827,15 @@ float_to_list(_Float, _Options) ->
 fun_info(_Fun, _Item) ->
     erlang:nif_error(undefined).
 
+%% fun_info_mfa/1
+-spec erlang:fun_info_mfa(Fun) -> {Mod, Name, Arity} when
+      Fun :: function(),
+      Mod :: atom(),
+      Name :: atom(),
+      Arity :: non_neg_integer().
+fun_info_mfa(_Fun) ->
+    erlang:nif_error(undefined).
+
 %% fun_to_list/1
 -spec erlang:fun_to_list(Fun) -> string() when
       Fun :: function().
-- 
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