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authorBjörn Gustavsson <[email protected]>2015-10-08 13:04:40 +0200
committerBjörn Gustavsson <[email protected]>2015-10-09 10:31:19 +0200
commit93f5844185a459cbf9efc3843919c463a2eef0fe (patch)
tree4188b1ce168a8d4d432646d061f11c315c1cf9ba /erts/emulator/beam
parent5472eb516e969f7f9ac50ab57b195e5b043e1d79 (diff)
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Teach erlang:is_builtin/3 that erlang:apply/3 is built-in
erlang:is_builtin(erlang, apply, 3) returns 'false'. That seems to be an oversight in the implementation of erlang:is_builtin/3 rather than a conscious design decision. Part of apply/3 is implemented in C (as a special instruction), and part of it in Erlang (only used if apply/3 is used recursively). That makes apply/3 special compared to all other BIFs. From the viewpoint of the user, apply/3 is a built-in function, since it cannot possibly be implemented in pure Erlang. Noticed-by: Stavros Aronis
Diffstat (limited to 'erts/emulator/beam')
-rw-r--r--erts/emulator/beam/beam_emu.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/erts/emulator/beam/beam_emu.c b/erts/emulator/beam/beam_emu.c
index a42ce1c9f1..faf496a030 100644
--- a/erts/emulator/beam/beam_emu.c
+++ b/erts/emulator/beam/beam_emu.c
@@ -6752,6 +6752,15 @@ erts_is_builtin(Eterm Mod, Eterm Name, int arity)
Export e;
Export* ep;
+ if (Mod == am_erlang && Name == am_apply && arity == 3) {
+ /*
+ * Special case. apply/3 is built-in (implemented in C),
+ * but implemented in a different way than all other
+ * BIFs.
+ */
+ return 1;
+ }
+
e.code[0] = Mod;
e.code[1] = Name;
e.code[2] = arity;