1 files changed, 35 insertions, 4 deletions
diff --git a/lib/stdlib/src/erl_parse.yrl b/lib/stdlib/src/erl_parse.yrl
index 15b45d72f4..bd5d65a1e1 100644
--- a/lib/stdlib/src/erl_parse.yrl
+++ b/lib/stdlib/src/erl_parse.yrl
@@ -511,6 +511,15 @@ Erlang code.
 %% of the generated .erl file by the HiPE compiler.  Please do not remove.
 -compile([{hipe,[{regalloc,linear_scan}]}]).
 
+-export_type([abstract_clause/0, abstract_expr/0, abstract_form/0,
+              error_info/0]).
+
+-type abstract_clause() :: term().
+-type abstract_expr() :: term().
+-type abstract_form() :: term().
+-type error_description() :: term().
+-type error_info() :: {erl_scan:line(), module(), error_description()}.
+-type token() :: {Tag :: atom(), Line :: erl_scan:line()}.
 
 %% mkop(Op, Arg) -> {op,Line,Op,Arg}.
 %% mkop(Left, Op, Right) -> {op,Line,Op,Left,Right}.
@@ -534,11 +543,19 @@ Erlang code.
 %% These really suck and are only here until Calle gets multiple
 %% entry points working.
 
+-spec parse_form(Tokens) -> {ok, AbsForm} | {error, ErrorInfo} when
+      Tokens :: [token()],
+      AbsForm :: abstract_form(),
+      ErrorInfo :: error_info().
 parse_form([{'-',L1},{atom,L2,spec}|Tokens]) ->
     parse([{'-',L1},{'spec',L2}|Tokens]);
 parse_form(Tokens) ->
     parse(Tokens).
 
+-spec parse_exprs(Tokens) -> {ok, ExprList} | {error, ErrorInfo} when
+      Tokens :: [token()],
+      ExprList :: [abstract_expr()],
+      ErrorInfo :: error_info().
 parse_exprs(Tokens) ->
     case parse([{atom,0,f},{'(',0},{')',0},{'->',0}|Tokens]) of
 	{ok,{function,_Lf,f,0,[{clause,_Lc,[],[],Exprs}]}} ->
@@ -546,6 +563,10 @@ parse_exprs(Tokens) ->
 	{error,_} = Err -> Err
     end.
 
+-spec parse_term(Tokens) -> {ok, Term} | {error, ErrorInfo} when
+      Tokens :: [token()],
+      Term :: term(),
+      ErrorInfo :: error_info().
 parse_term(Tokens) ->
     case parse([{atom,0,f},{'(',0},{')',0},{'->',0}|Tokens]) of
 	{ok,{function,_Lf,f,0,[{clause,_Lc,[],[],[Expr]}]}} ->
@@ -830,6 +851,7 @@ check_clauses(Cs, Name, Arity) ->
 build_try(L,Es,Scs,{Ccs,As}) ->
     {'try',L,Es,Scs,Ccs,As}.
 
+-spec ret_err(_, _) -> no_return().
 ret_err(L, S) ->
     {location,Location} = get_attribute(L, location),
     return_error(Location, S).
@@ -846,10 +868,11 @@ mapl(F, [H|T]) ->
 mapl(_, []) ->
 	[].
 
-%% normalise(AbsTerm)
-%% abstract(Term)
 %%  Convert between the abstract form of a term and a term.
 
+-spec normalise(AbsTerm) -> Data when
+      AbsTerm :: abstract_expr(),
+      Data :: term().
 normalise({char,_,C}) -> C;
 normalise({integer,_,I}) -> I;
 normalise({float,_,F}) -> F;
@@ -887,6 +910,9 @@ normalise_list([H|T]) ->
 normalise_list([]) ->
     [].
 
+-spec abstract(Data) -> AbsTerm when
+      Data :: term(),
+      AbsTerm :: abstract_expr().
 abstract(T) when is_integer(T) -> {integer,0,T};
 abstract(T) when is_float(T) -> {float,0,T};
 abstract(T) when is_atom(T) -> {atom,0,T};
@@ -955,13 +981,18 @@ abstract_list([H|T], Line) ->
 abstract_list([], _Line) ->
     [].
 
-%% tokens(AbsTerm) -> [Token]
-%% tokens(AbsTerm, More) -> [Token]
 %%  Generate a list of tokens representing the abstract term.
 
+-spec tokens(AbsTerm) -> Tokens when
+      AbsTerm :: abstract_expr(),
+      Tokens :: [token()].
 tokens(Abs) ->
     tokens(Abs, []).
 
+-spec tokens(AbsTerm, MoreTokens) -> Tokens when
+      AbsTerm :: abstract_expr(),
+      MoreTokens :: [token()],
+      Tokens :: [token()].
 tokens({char,L,C}, More) -> [{char,L,C}|More];
 tokens({integer,L,N}, More) -> [{integer,L,N}|More];
 tokens({float,L,F}, More) -> [{float,L,F}|More];