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authorBjörn Gustavsson <[email protected]>2013-01-13 09:09:18 +0100
committerBjörn Gustavsson <[email protected]>2013-01-14 12:12:20 +0100
commitf22da5738e7fd4995d177d602c29bd80d8072ccc (patch)
tree408e3ef91f99b0fd66189c20fb245924031c3265 /lib/kernel/src
parent9f461fbaf0be7aba7c0b8b89be1f0b6f1141b7a5 (diff)
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Teach error_handler to call '$handle_undefined_function'
Diffstat (limited to 'lib/kernel/src')
-rw-r--r--lib/kernel/src/error_handler.erl53
1 files changed, 21 insertions, 32 deletions
diff --git a/lib/kernel/src/error_handler.erl b/lib/kernel/src/error_handler.erl
index f8bc5f499c..a3aa1f1dcf 100644
--- a/lib/kernel/src/error_handler.erl
+++ b/lib/kernel/src/error_handler.erl
@@ -23,10 +23,12 @@
%% "error_handler: add no_native compiler directive"
-compile(no_native).
-%% A simple error handler.
+%% Callbacks called from the run-time system.
+-export([undefined_function/3,undefined_lambda/3,breakpoint/3]).
--export([undefined_function/3, undefined_lambda/3, stub_function/3,
- breakpoint/3]).
+%% Exported utility functions.
+-export([raise_undef_exception/3]).
+-export([stub_function/3]).
-spec undefined_function(Module, Function, Args) ->
any() when
@@ -41,12 +43,7 @@ undefined_function(Module, Func, Args) ->
true ->
apply(Module, Func, Args);
false ->
- case check_inheritance(Module, Args) of
- {value, Base, Args1} ->
- apply(Base, Func, Args1);
- none ->
- crash(Module, Func, Args)
- end
+ call_undefined_function_handler(Module, Func, Args)
end;
{module, _} ->
crash(Module, Func, Args);
@@ -77,6 +74,14 @@ undefined_lambda(Module, Fun, Args) ->
breakpoint(Module, Func, Args) ->
(int()):eval(Module, Func, Args).
+-spec raise_undef_exception(Module, Function, Args) -> no_return() when
+ Module :: atom(),
+ Function :: atom(),
+ Args :: list().
+
+raise_undef_exception(Module, Func, Args) ->
+ crash({Module,Func,Args,[]}).
+
%% Used to make the call to the 'int' module a "weak" one, to avoid
%% building strong components in xref or dialyzer.
@@ -130,27 +135,11 @@ ensure_loaded(Module) ->
stub_function(Mod, Func, Args) ->
exit({undef,[{Mod,Func,Args,[]}]}).
-check_inheritance(Module, Args) ->
- Attrs = erlang:get_module_info(Module, attributes),
- case lists:keyfind(extends, 1, Attrs) of
- {extends, [Base]} when is_atom(Base), Base =/= Module ->
- %% This is just a heuristic for detecting abstract modules
- %% with inheritance so they can be handled; it would be
- %% much better to do it in the emulator runtime
- case lists:keyfind(abstract, 1, Attrs) of
- {abstract, [true]} ->
- case lists:reverse(Args) of
- [M|Rs] when tuple_size(M) > 1,
- element(1,M) =:= Module,
- tuple_size(element(2,M)) > 0,
- is_atom(element(1,element(2,M))) ->
- {value, Base, lists:reverse(Rs, [element(2,M)])};
- _ ->
- {value, Base, Args}
- end;
- _ ->
- {value, Base, Args}
- end;
- _ ->
- none
+call_undefined_function_handler(Module, Func, Args) ->
+ Handler = '$handle_undefined_function',
+ case erlang:function_exported(Module, Handler, 2) of
+ false ->
+ crash(Module, Func, Args);
+ true ->
+ Module:Handler(Func, Args)
end.