From db159faace6e8525e7883a7cb60eb57275d66924 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Thu, 18 Aug 2016 11:50:30 +0200
Subject: xref: Eliminate use of sys_pre_expand

---
 lib/tools/src/xref_reader.erl | 55 ++++++++++++++++++++++++++++++++++---------
 1 file changed, 44 insertions(+), 11 deletions(-)

(limited to 'lib/tools/src/xref_reader.erl')

diff --git a/lib/tools/src/xref_reader.erl b/lib/tools/src/xref_reader.erl
index 41b93caaeb..6c4a1c4d8e 100644
--- a/lib/tools/src/xref_reader.erl
+++ b/lib/tools/src/xref_reader.erl
@@ -42,17 +42,15 @@
 	 %% experimental; -xref(FunEdge) is recognized.
 	 lattrs=[],            % local calls, {{mfa(),mfa()},Line}
 	 xattrs=[],            % external calls, -"-
-	 battrs=[]             % badly formed xref attributes, term().
+	 battrs=[]	       % badly formed xref attributes, term().
 	 }).
 
 -include("xref.hrl").
 
-%% sys_pre_expand has modified the forms slightly compared to what
-%% erl_id_trans recognizes.
-
 %% The versions of the abstract code are as follows:
-%% R7: abstract_v1
-%% R8: abstract_v2
+%% R7:  abstract_v1
+%% R8:  abstract_v2
+%% R9C: raw_abstract_v1
 
 %% -> {ok, Module, {DefAt, CallAt, LC, XC, X, Attrs}, Unresolved}} | EXIT
 %% Attrs = {ALC, AXC, Bad}
@@ -92,7 +90,12 @@ form({function, Anno, Name, Arity, Clauses}, S) ->
     Line = erl_anno:line(Anno),
     S2 = S1#xrefr{def_at = [{MFA,Line} | S#xrefr.def_at]},
     S3 = clauses(Clauses, S2),
-    S3#xrefr{function = []}.
+    S3#xrefr{function = []};
+form(_, S) ->
+    %% OTP 20. Other uninteresting forms such as {eof, _} and {warning, _}.
+    %% Exposed because sys_pre_expand is no longer run.
+    S.
+
 
 clauses(Cls, S) ->
     #xrefr{funvars = FunVars, matches = Matches} = S,
@@ -109,6 +112,8 @@ clauses([{clause, _Line, _H, G, B} | Cs], FunVars, Matches, S) ->
 clauses([], _FunVars, _Matches, S) ->
     S.
 
+attr(NotList, Ln, M, Fun, AL, AX, B, S) when not is_list(NotList) ->
+    attr([NotList], Ln, M, Fun, AL, AX, B, S);
 attr([E={From, To} | As], Ln, M, Fun, AL, AX, B, S) ->
     case mfa(From, M) of
 	{_, _, MFA} when MFA =:= Fun; [] =:= Fun ->
@@ -154,6 +159,15 @@ expr({'try',_Line,Es,Scs,Ccs,As}, S) ->
     S2 = clauses(Scs, S1),
     S3 = clauses(Ccs, S2),
     expr(As, S3);
+expr({'fun', Line, {function,M,F,A}}, S)
+  when is_atom(M), is_atom(F), is_integer(A) ->
+    %% This is the old format for external funs, generated by a pre-R15
+    %% compiler. Exposed in OTP 20 because sys_pre_expand is no longer
+    %% run.
+    Fun = {'fun', Line, {function, {atom,Line,M},
+			 {atom,Line,F},
+			 {integer,Line,A}}},
+    expr(Fun, S);
 expr({'fun', Line, {function, {atom,_,Mod},
 		    {atom,_,Name},
 		    {integer,_,Arity}}}, S) ->
@@ -168,14 +182,21 @@ expr({'fun', Line, {function, Mod, Name, _Arity}}, S) ->
     %% New format in R15. M:F/A (one or more variables).
     As = {var, Line, '_'},
     external_call(erlang, apply, [Mod, Name, As], Line, true, S);
+%% Only abstract_v1 and abstract_v2.
 expr({'fun', Line, {function, Name, Arity}, _Extra}, S) ->
     %% Added in R8.
     handle_call(local, S#xrefr.module, Name, Arity, Line, S);
 expr({'fun', _Line, {clauses, Cs}, _Extra}, S) ->
     clauses(Cs, S);
-expr({named_fun, _Line, '_', Cs, _Extra}, S) ->
+%% End abstract_v1 and abstract_v2.
+expr({'fun', Line, {function, Name, Arity}}, S) ->
+    %% Added in OTP 20.
+    handle_call(local, S#xrefr.module, Name, Arity, Line, S);
+expr({'fun', _Line, {clauses, Cs}}, S) ->
+    clauses(Cs, S);
+expr({named_fun, _Line, '_', Cs}, S) ->
     clauses(Cs, S);
-expr({named_fun, _Line, Name, Cs, _Extra}, S) ->
+expr({named_fun, _Line, Name, Cs}, S) ->
     S1 = S#xrefr{funvars = [Name | S#xrefr.funvars]},
     clauses(Cs, S1);
 expr({call, Line, {atom, _, Name}, As}, S) ->
@@ -193,7 +214,12 @@ expr({match, _Line, {var,_,Var}, {'fun', _, {clauses, Cs}, _Extra}}, S) ->
     %% that are passed around by the "expansion" of list comprehension.
     S1 = S#xrefr{funvars = [Var | S#xrefr.funvars]},
     clauses(Cs, S1);
-expr({match, _Line, {var,_,Var}, {named_fun, _, _, _, _} = Fun}, S) ->
+expr({match, _Line, {var,_,Var}, {'fun', _, {clauses, Cs}}}, S) ->
+    %% OTP 20. Exposed because sys_pre_expand is no longer run.
+    S1 = S#xrefr{funvars = [Var | S#xrefr.funvars]},
+    clauses(Cs, S1);
+expr({match, _Line, {var,_,Var}, {named_fun, _, _, _} = Fun}, S) ->
+    %% OTP 20. Exposed because sys_pre_expand is no longer run.
     S1 = S#xrefr{funvars = [Var | S#xrefr.funvars]},
     expr(Fun, S1);
 expr({match, _Line, {var,_,Var}, E}, S) ->
@@ -295,10 +321,17 @@ check_funarg(W, ArgsList, Line, S) ->
     expr(ArgsList, S1).
 
 funarg({'fun', _, _Clauses, _Extra}, _S) -> true;
+funarg({'fun', _, {clauses, _}}, _S) ->
+    %% OTP 20. sys_pre_expand not run.
+    true;
+funarg({'fun', _, {function, _, _}}, _S) ->
+    %% OTP 20. sys_pre_expand not run.
+    true;
 funarg({'fun', _, {function,_,_,_}}, _S) ->
     %% New abstract format for fun M:F/A in R15.
     true;
-funarg({named_fun, _, _, _, _}, _S) ->
+funarg({named_fun, _, _, _}, _S) ->
+    %% OTP 20. sys_pre_expand not run.
     true;
 funarg({var, _, Var}, S) -> member(Var, S#xrefr.funvars);
 funarg(_, _S) -> false.
-- 
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