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-rw-r--r--lib/compiler/src/beam_jump.erl17
1 files changed, 14 insertions, 3 deletions
diff --git a/lib/compiler/src/beam_jump.erl b/lib/compiler/src/beam_jump.erl
index e096270d8c..4365451356 100644
--- a/lib/compiler/src/beam_jump.erl
+++ b/lib/compiler/src/beam_jump.erl
@@ -130,6 +130,11 @@
-import(lists, [reverse/1,reverse/2,foldl/3]).
+-type instruction() :: beam_utils:instruction().
+
+-spec module(beam_utils:module_code(), [compile:option()]) ->
+ {'ok',beam_utils:module_code()}.
+
module({Mod,Exp,Attr,Fs0,Lc}, _Opt) ->
Fs = [function(F) || F <- Fs0],
{ok,{Mod,Exp,Attr,Fs,Lc}}.
@@ -269,9 +274,9 @@ extract_seq_1(_, _) -> no.
-record(st,
{
- entry, %Entry label (must not be moved).
- mlbl, %Moved labels.
- labels :: cerl_sets:set() %Set of referenced labels.
+ entry :: beam_asm:label(), %Entry label (must not be moved).
+ mlbl :: #{beam_asm:label() := [beam_asm:label()]}, %Moved labels.
+ labels :: cerl_sets:set() %Set of referenced labels.
}).
opt(Is0, CLabel) ->
@@ -453,6 +458,8 @@ is_label_used(L, St) ->
%% is_unreachable_after(Instruction) -> boolean()
%% Test whether the code after Instruction is unreachable.
+-spec is_unreachable_after(instruction()) -> boolean().
+
is_unreachable_after({func_info,_M,_F,_A}) -> true;
is_unreachable_after(return) -> true;
is_unreachable_after({jump,_Lbl}) -> true;
@@ -465,6 +472,8 @@ is_unreachable_after(I) -> is_exit_instruction(I).
%% Test whether the instruction Instruction always
%% causes an exit/failure.
+-spec is_exit_instruction(instruction()) -> boolean().
+
is_exit_instruction({call_ext,_,{extfunc,M,F,A}}) ->
erl_bifs:is_exit_bif(M, F, A);
is_exit_instruction(if_end) -> true;
@@ -477,6 +486,8 @@ is_exit_instruction(_) -> false.
%% Remove all unused labels. Also remove unreachable
%% instructions following labels that are removed.
+-spec remove_unused_labels([instruction()]) -> [instruction()].
+
remove_unused_labels(Is) ->
Used0 = initial_labels(Is),
Used = foldl(fun ulbl/2, Used0, Is),