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-rw-r--r--lib/kernel/doc/src/error_handler.xml38
-rw-r--r--lib/kernel/src/error_handler.erl53
-rw-r--r--lib/kernel/test/Makefile1
-rw-r--r--lib/kernel/test/error_handler_SUITE.erl68
4 files changed, 119 insertions, 41 deletions
diff --git a/lib/kernel/doc/src/error_handler.xml b/lib/kernel/doc/src/error_handler.xml
index acbf9a2c6e..610b65f0a2 100644
--- a/lib/kernel/doc/src/error_handler.xml
+++ b/lib/kernel/doc/src/error_handler.xml
@@ -43,19 +43,39 @@
A (possibly empty) list of arguments <c>Arg1,..,ArgN</c>
</type_desc>
<desc>
- <p>This function is evaluated if a call is made to
+ <p>This function is called by the run-time system if a call is made to
<c><anno>Module</anno>:<anno>Function</anno>(Arg1,.., ArgN)</c> and
<c><anno>Module</anno>:<anno>Function</anno>/N</c> is undefined. Note that
<c>undefined_function/3</c> is evaluated inside the process
making the original call.</p>
- <p>If <c><anno>Module</anno></c> is interpreted, the interpreter is invoked
- and the return value of the interpreted
- <c><anno>Function</anno>(Arg1,.., ArgN)</c> call is returned.</p>
- <p>Otherwise, it returns, if possible, the value of
- <c>apply(<anno>Module</anno>, <anno>Function</anno>, <anno>Args</anno>)</c> after an attempt has been
- made to autoload <c><anno>Module</anno></c>. If this is not possible, the
- call to <c><anno>Module</anno>:<anno>Function</anno>(Arg1,.., ArgN)</c> fails with
- exit reason <c>undef</c>.</p>
+
+ <p>This function will first attempt to autoload
+ <c><anno>Module</anno></c>. If that is not possible,
+ an <c>undef</c> exception will be raised.</p>
+
+ <p>If it was possible to load <c><anno>Module</anno></c>
+ and the function <c><anno>Function</anno>/N</c> is exported,
+ it will be called.</p>
+
+ <p>Otherwise, if the function <c>'$handle_undefined_function'/2</c>
+ is exported, it will be called as
+ <c>'$handle_undefined_function'(</c><anno>Function</anno>,
+ <anno>Args</anno>).
+ </p>
+ <p>Otherwise an <c>undef</c> exception will be raised.</p>
+ </desc>
+ </func>
+ <func>
+ <name name="raise_undef_exception" arity="3"/>
+ <fsummary>Raise an undef exception</fsummary>
+ <type_desc variable="Args">
+ A (possibly empty) list of arguments <c>Arg1,..,ArgN</c>
+ </type_desc>
+ <desc>
+ <p>Raise an <c>undef</c> exception with a stacktrace indicating
+ that <c><anno>Module</anno>:<anno>Function</anno>/N</c> is
+ undefined.
+ </p>
</desc>
</func>
<func>
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 = '$handle_undefined_function',
+ case erlang:function_exported(Module, Handler, 2) of
+ false ->
+ crash(Module, Func, Args);
+ true ->
+ Module:Handler(Func, Args)
end.
diff --git a/lib/kernel/test/Makefile b/lib/kernel/test/Makefile
index 7fd3afe93c..8d2d55777b 100644
--- a/lib/kernel/test/Makefile
+++ b/lib/kernel/test/Makefile
@@ -48,6 +48,7 @@ MODULES= \
erl_distribution_SUITE \
erl_distribution_wb_SUITE \
erl_prim_loader_SUITE \
+ error_handler_SUITE \
error_logger_SUITE \
error_logger_warn_SUITE \
file_SUITE \
diff --git a/lib/kernel/test/error_handler_SUITE.erl b/lib/kernel/test/error_handler_SUITE.erl
new file mode 100644
index 0000000000..2a86d39b74
--- /dev/null
+++ b/lib/kernel/test/error_handler_SUITE.erl
@@ -0,0 +1,68 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2013. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(error_handler_SUITE).
+
+-export([all/0,suite/0,groups/0,init_per_suite/1,end_per_suite/1,
+ init_per_group/2,end_per_group/2,
+ undefined_function_handler/1]).
+
+%% Callback from error_handler.
+-export(['$handle_undefined_function'/2]).
+
+suite() -> [{ct_hooks,[ts_install_cth]}].
+
+all() ->
+ [undefined_function_handler].
+
+groups() ->
+ [].
+
+init_per_suite(Config) ->
+ Config.
+
+end_per_suite(_Config) ->
+ ok.
+
+init_per_group(_GroupName, Config) ->
+ Config.
+
+end_per_group(_GroupName, Config) ->
+ Config.
+
+
+%%-----------------------------------------------------------------
+
+undefined_function_handler(_) ->
+ 42 = ?MODULE:forty_two(),
+ 42 = (id(?MODULE)):forty_two(),
+ {ok,{a,b,c}} = ?MODULE:one_arg({a,b,c}),
+ {ok,{a,b,c}} = (id(?MODULE)):one_arg({a,b,c}),
+ {'EXIT',{undef,[{?MODULE,undef_and_not_handled,[[1,2,3]],[]}|_]}} =
+ (catch ?MODULE:undef_and_not_handled([1,2,3])),
+ ok.
+
+'$handle_undefined_function'(forty_two, []) ->
+ 42;
+'$handle_undefined_function'(one_arg, [Arg]) ->
+ {ok,Arg};
+'$handle_undefined_function'(Func, Args) ->
+ error_handler:raise_undef_exception(?MODULE, Func, Args).
+
+id(I) ->
+ I.
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-29 05:13:26 +0000