erts: Fix loading of modules with invalid floating point arithmetic

The following program is supposed to cause an exception
at run-time:

foo() ->
     Sum1 = Sum2 = N = 2,
     pSum - (Sum1*(Sum2/N)).

but the loader fails to load because it contains the
following instruction:

fconv {atom,pSum} {fr,2}

Fix the loader so that it can handle fconv instructions
where the first operand is a non-numeric literal.

Reported-by: Torbjörn Törnkvist

2 files changed, 25 insertions, 2 deletions

diff --git a/erts/emulator/beam/ops.tab b/erts/emulator/beam/ops.tab
index 231ea34fd5..9e8ac74f40 100644
--- a/erts/emulator/beam/ops.tab
+++ b/erts/emulator/beam/ops.tab
@@ -1304,7 +1304,7 @@ fmul p FR1 FR2 FR3 => i_fmul FR1 FR2 FR3
 fdiv p FR1 FR2 FR3 => i_fdiv FR1 FR2 FR3
 fnegate p FR1 FR2 => i_fnegate FR1 FR2
 
-fconv Int=iq Dst=l => move Int x | fconv x Dst
+fconv Arg=iqan Dst=l => move Arg x | fconv x Dst
 
 fmove q l
 fmove d l
diff --git a/erts/emulator/test/beam_SUITE.erl b/erts/emulator/test/beam_SUITE.erl
index cc1626630b..d712691871 100644
--- a/erts/emulator/test/beam_SUITE.erl
+++ b/erts/emulator/test/beam_SUITE.erl
@@ -20,7 +20,7 @@
 -module(beam_SUITE).
 
 -export([all/1, packed_registers/1, apply_last/1, apply_last_bif/1,
-	 buildo_mucho/1, heap_sizes/1, big_lists/1]).
+	 buildo_mucho/1, heap_sizes/1, big_lists/1, fconv/1]).
 
 -export([applied/2]).
 
@@ -279,3 +279,26 @@ b() ->
          _} ->
 	    ok
     end.
+
+fconv(Config) when is_list(Config) ->
+    ?line do_fconv(atom),
+    ?line do_fconv(nil),
+    ?line do_fconv(tuple_literal),
+    ?line 3.0 = do_fconv(1.0, 2.0),
+    ok.
+
+do_fconv(Type) ->
+    try
+	do_fconv(Type, 1.0),
+	test_server:fail()
+    catch
+	error:badarith ->
+	    ok
+    end.
+
+do_fconv(atom, Float) when is_float(Float) ->
+    Float + a;
+do_fconv(nil, Float) when is_float(Float) ->
+    Float + [];
+do_fconv(tuple_literal, Float) when is_float(Float) ->
+    Float + {a,b}.