From 64ee859fc4c17259ab95192abf7493fed8f2b0ac Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Wed, 16 May 2012 10:50:30 +0200
Subject: Implement support for maps in the compiler

To make it possible to build the entire OTP system, also define
dummys for the instructions in ops.tab.
---
 lib/compiler/src/sys_core_fold.erl | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'lib/compiler/src/sys_core_fold.erl')

diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl
index a388960312..672a8b94c0 100644
--- a/lib/compiler/src/sys_core_fold.erl
+++ b/lib/compiler/src/sys_core_fold.erl
@@ -246,6 +246,16 @@ expr(#c_tuple{anno=Anno,es=Es0}=Tuple, Ctxt, Sub) ->
 	value ->
 	    ann_c_tuple(Anno, Es)
     end;
+expr(#c_map{var=V0,es=Es0}=Map, Ctxt, Sub) ->
+    Es = pair_list(Es0, Ctxt, Sub),
+    case Ctxt of
+	effect ->
+	    add_warning(Map, useless_building),
+	    expr(make_effect_seq(Es, Sub), Ctxt, Sub);
+	value ->
+	    V = expr(V0, Ctxt, Sub),
+	    Map#c_map{var=V,es=Es}
+    end;
 expr(#c_binary{segments=Ss}=Bin0, Ctxt, Sub) ->
     %% Warn for useless building, but always build the binary
     %% anyway to preserve a possible exception.
@@ -408,6 +418,16 @@ expr(#c_try{anno=A,arg=E0,vars=Vs0,body=B0,evars=Evs0,handler=H0}=Try, _, Sub0)
 expr_list(Es, Ctxt, Sub) ->
     [expr(E, Ctxt, Sub) || E <- Es].
 
+pair_list(Es, Ctxt, Sub) ->
+    [pair(E, Ctxt, Sub) || E <- Es].
+
+pair(#c_map_pair{key=K,val=V}, effect, Sub) ->
+    make_effect_seq([K,V], Sub);
+pair(#c_map_pair{key=K0,val=V0}=Pair, value=Ctxt, Sub) ->
+    K = expr(K0, Ctxt, Sub),
+    V = expr(V0, Ctxt, Sub),
+    Pair#c_map_pair{key=K,val=V}.
+
 bitstr_list(Es, Sub) ->
     [bitstr(E, Sub) || E <- Es].
 
@@ -1500,6 +1520,9 @@ pattern(#c_cons{anno=Anno,hd=H0,tl=T0}, Isub, Osub0) ->
 pattern(#c_tuple{anno=Anno,es=Es0}, Isub, Osub0) ->
     {Es1,Osub1} = pattern_list(Es0, Isub, Osub0),
     {ann_c_tuple(Anno, Es1),Osub1};
+pattern(#c_map{anno=Anno,es=Es0}=Map, Isub, Osub0) ->
+    {Es1,Osub1} = map_pair_pattern_list(Es0, Isub, Osub0),
+    {Map#c_map{anno=Anno,es=Es1},Osub1};
 pattern(#c_binary{segments=V0}=Pat, Isub, Osub0) ->
     {V1,Osub1} = bin_pattern_list(V0, Isub, Osub0),
     {Pat#c_binary{segments=V1},Osub1};
@@ -1509,6 +1532,15 @@ pattern(#c_alias{var=V0,pat=P0}=Pat, Isub, Osub0) ->
     Osub = update_types(V1, [P1], Osub2),
     {Pat#c_alias{var=V1,pat=P1},Osub}.
 
+map_pair_pattern_list(Ps0, Isub, Osub0) ->
+    {Ps,{_,Osub}} = mapfoldl(fun map_pair_pattern/2, {Isub,Osub0}, Ps0),
+    {Ps,Osub}.
+
+map_pair_pattern(#c_map_pair{key=K0,val=V0}=Pair, {Isub,Osub0}) ->
+    {K,Osub1} = pattern(K0, Isub, Osub0),
+    {V,Osub} = pattern(V0, Isub, Osub1),
+    {Pair#c_map_pair{key=K,val=V},{Isub,Osub}}.
+
 bin_pattern_list(Ps0, Isub, Osub0) ->
     {Ps,{_,Osub}} = mapfoldl(fun bin_pattern/2, {Isub,Osub0}, Ps0),
     {Ps,Osub}.
-- 
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