diff options
Diffstat (limited to 'lib/compiler/src/sys_pre_expand.erl')
| -rw-r--r-- | lib/compiler/src/sys_pre_expand.erl | 42 |
1 files changed, 36 insertions, 6 deletions
diff --git a/lib/compiler/src/sys_pre_expand.erl b/lib/compiler/src/sys_pre_expand.erl index 761ae8409c..6410b73941 100644 --- a/lib/compiler/src/sys_pre_expand.erl +++ b/lib/compiler/src/sys_pre_expand.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 1996-2012. All Rights Reserved. +%% Copyright Ericsson AB 1996-2014. 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 @@ -33,12 +33,15 @@ -include("../include/erl_bits.hrl"). +-type fa() :: {atom(), arity()}. + -record(expand, {module=[], %Module name exports=[], %Exports imports=[], %Imports compile=[], %Compile flags attributes=[], %Attributes callbacks=[], %Callbacks + optional_callbacks=[] :: [fa()], %Optional callbacks defined, %Defined functions (gb_set) vcount=0, %Variable counter func=[], %Current function @@ -99,7 +102,21 @@ define_functions(Forms, #expand{defined=Predef}=St) -> module_attrs(#expand{attributes=Attributes}=St) -> Attrs = [{attribute,Line,Name,Val} || {Name,Line,Val} <- Attributes], Callbacks = [Callback || {_,_,callback,_}=Callback <- Attrs], - {Attrs,St#expand{callbacks=Callbacks}}. + OptionalCallbacks = get_optional_callbacks(Attrs), + {Attrs,St#expand{callbacks=Callbacks, + optional_callbacks=OptionalCallbacks}}. + +get_optional_callbacks(Attrs) -> + L = [O || + {attribute, _, optional_callbacks, O} <- Attrs, + is_fa_list(O)], + lists:append(L). + +is_fa_list([{FuncName, Arity}|L]) + when is_atom(FuncName), is_integer(Arity), Arity >= 0 -> + is_fa_list(L); +is_fa_list([]) -> true; +is_fa_list(_) -> false. module_predef_funcs(St) -> {Mpf1,St1}=module_predef_func_beh_info(St), @@ -108,19 +125,24 @@ module_predef_funcs(St) -> module_predef_func_beh_info(#expand{callbacks=[]}=St) -> {[], St}; -module_predef_func_beh_info(#expand{callbacks=Callbacks,defined=Defined, +module_predef_func_beh_info(#expand{callbacks=Callbacks, + optional_callbacks=OptionalCallbacks, + defined=Defined, exports=Exports}=St) -> PreDef=[{behaviour_info,1}], PreExp=PreDef, - {[gen_beh_info(Callbacks)], + {[gen_beh_info(Callbacks, OptionalCallbacks)], St#expand{defined=gb_sets:union(gb_sets:from_list(PreDef), Defined), exports=union(from_list(PreExp), Exports)}}. -gen_beh_info(Callbacks) -> +gen_beh_info(Callbacks, OptionalCallbacks) -> List = make_list(Callbacks), + OptionalList = make_optional_list(OptionalCallbacks), {function,0,behaviour_info,1, [{clause,0,[{atom,0,callbacks}],[], - [List]}]}. + [List]}, + {clause,0,[{atom,0,optional_callbacks}],[], + [OptionalList]}]}. make_list([]) -> {nil,0}; make_list([{_,_,_,[{{Name,Arity},_}]}|Rest]) -> @@ -130,6 +152,14 @@ make_list([{_,_,_,[{{Name,Arity},_}]}|Rest]) -> {integer,0,Arity}]}, make_list(Rest)}. +make_optional_list([]) -> {nil,0}; +make_optional_list([{Name,Arity}|Rest]) -> + {cons,0, + {tuple,0, + [{atom,0,Name}, + {integer,0,Arity}]}, + make_optional_list(Rest)}. + module_predef_funcs_mod_info(St) -> PreDef = [{module_info,0},{module_info,1}], PreExp = PreDef, |