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authorBjörn Gustavsson <bjorn@erlang.org>2016-05-30 18:57:22 +0200
committerBjörn Gustavsson <bjorn@erlang.org>2016-05-31 13:03:24 +0200
commit64375c745822840f1b3c910b5bd60e663b107faa (patch)
tree12927872d41590a5266d59fe8af76555cec5307c /lib
parent17e95dd8dcb0149b771d4aafaeeebc715ee59d3d (diff)
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beam_validator: Use a record representing the match context
Using a record will make it much easier to add additional information.
Diffstat (limited to 'lib')
-rw-r--r--lib/compiler/src/beam_validator.erl34
1 files changed, 20 insertions, 14 deletions
diff --git a/lib/compiler/src/beam_validator.erl b/lib/compiler/src/beam_validator.erl
index 1af17dc641..1cb90a043a 100644
--- a/lib/compiler/src/beam_validator.erl
+++ b/lib/compiler/src/beam_validator.erl
@@ -161,6 +161,12 @@ validate_0(Module, [{function,Name,Ar,Entry,Code}|Fs], Ft) ->
% in the module (those that start with bs_start_match2).
}).
+%% Match state.
+-record(ms,
+ {valid=0 :: non_neg_integer(), %Valid slots
+ slots=0 :: non_neg_integer() %Number of slots
+ }).
+
validate_1(Is, Name, Arity, Entry, Ft) ->
validate_2(labels(Is), Name, Arity, Entry, Ft).
@@ -274,7 +280,7 @@ valfun_1({bs_context_to_binary,Ctx}, #vst{current=#st{x=Xs}}=Vst) ->
case Ctx of
{Tag,X} when Tag =:= x; Tag =:= y ->
Type = case gb_trees:lookup(X, Xs) of
- {value,{match_context,_,_}} -> term;
+ {value,#ms{}} -> term;
_ -> get_term_type(Ctx, Vst)
end,
set_type_reg(Type, Ctx, Vst);
@@ -575,7 +581,7 @@ valfun_4({test,bs_start_match2,{f,Fail},Live,[Ctx,NeedSlots],Ctx}, Vst0) ->
verify_live(Live, Vst0),
Vst1 = prune_x_regs(Live, Vst0),
BranchVst = case CtxType of
- {match_context,_,_} ->
+ #ms{} ->
%% The failure branch will never be taken when Ctx
%% is a match context. Therefore, the type for Ctx
%% at the failure label must not be match_context
@@ -851,7 +857,7 @@ verify_call_args(_, 0, #vst{}) ->
verify_call_args({f,Lbl}, Live, Vst) when is_integer(Live)->
Verify = fun(R) ->
case get_move_term_type(R, Vst) of
- {match_context,_,_} ->
+ #ms{} ->
verify_call_match_context(Lbl, Vst);
_ ->
ok
@@ -1009,7 +1015,7 @@ assert_unique_map_keys([_,_|_]=Ls) ->
%%%
bsm_match_state(Slots) ->
- {match_context,0,Slots}.
+ #ms{slots=Slots}.
bsm_validate_context(Reg, Vst) ->
_ = bsm_get_context(Reg, Vst),
@@ -1017,7 +1023,7 @@ bsm_validate_context(Reg, Vst) ->
bsm_get_context({x,X}=Reg, #vst{current=#st{x=Xs}}=_Vst) when is_integer(X) ->
case gb_trees:lookup(X, Xs) of
- {value,{match_context,_,_}=Ctx} -> Ctx;
+ {value,#ms{}=Ctx} -> Ctx;
_ -> error({no_bsm_context,Reg})
end;
bsm_get_context(Reg, _) -> error({bad_source,Reg}).
@@ -1029,8 +1035,8 @@ bsm_save(Reg, {atom,start}, Vst) ->
Vst;
bsm_save(Reg, SavePoint, Vst) ->
case bsm_get_context(Reg, Vst) of
- {match_context,Bits,Slots} when SavePoint < Slots ->
- Ctx = {match_context,Bits bor (1 bsl SavePoint),Slots},
+ #ms{valid=Bits,slots=Slots}=Ctxt0 when SavePoint < Slots ->
+ Ctx = Ctxt0#ms{valid=Bits bor (1 bsl SavePoint),slots=Slots},
set_type_reg(Ctx, Reg, Vst);
_ -> error({illegal_save,SavePoint})
end.
@@ -1042,7 +1048,7 @@ bsm_restore(Reg, {atom,start}, Vst) ->
Vst;
bsm_restore(Reg, SavePoint, Vst) ->
case bsm_get_context(Reg, Vst) of
- {match_context,Bits,Slots} when SavePoint < Slots ->
+ #ms{valid=Bits,slots=Slots} when SavePoint < Slots ->
case Bits band (1 bsl SavePoint) of
0 -> error({illegal_restore,SavePoint,not_set});
_ -> Vst
@@ -1123,7 +1129,7 @@ assert_term(Src, Vst) ->
%% Thus 'exception' is never stored as type descriptor
%% for a register.
%%
-%% {match_context,_,_} A matching context for bit syntax matching. We do allow
+%% #ms{} A match context for bit syntax matching. We do allow
%% it to moved/to from stack, but otherwise it must only
%% be accessed by bit syntax matching instructions.
%%
@@ -1230,7 +1236,7 @@ get_term_type(Src, Vst) ->
initialized -> error({unassigned,Src});
{catchtag,_} -> error({catchtag,Src});
{trytag,_} -> error({trytag,Src});
- {match_context,_,_} -> error({match_context,Src});
+ #ms{} -> error({match_context,Src});
Type -> Type
end.
@@ -1382,11 +1388,11 @@ merge_types(bool, {atom,A}) ->
merge_bool(A);
merge_types({atom,A}, bool) ->
merge_bool(A);
-merge_types({match_context,B0,Slots},{match_context,B1,Slots}) ->
- {match_context,B0 bor B1,Slots};
-merge_types({match_context,_,_}=M, _) ->
+merge_types(#ms{valid=B0,slots=Slots}=M,#ms{valid=B1,slots=Slots}) ->
+ M#ms{valid=B0 bor B1,slots=Slots};
+merge_types(#ms{}=M, _) ->
M;
-merge_types(_, {match_context,_,_}=M) ->
+merge_types(_, #ms{}=M) ->
M;
merge_types(T1, T2) when T1 =/= T2 ->
%% Too different. All we know is that the type is a 'term'.