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-rw-r--r--lib/compiler/src/v3_codegen.erl58
-rw-r--r--lib/compiler/test/guard_SUITE.erl56
2 files changed, 82 insertions, 32 deletions
diff --git a/lib/compiler/src/v3_codegen.erl b/lib/compiler/src/v3_codegen.erl
index 5083995f30..6f1912c616 100644
--- a/lib/compiler/src/v3_codegen.erl
+++ b/lib/compiler/src/v3_codegen.erl
@@ -1330,12 +1330,13 @@ bif_cg(Bif, As, [{var,V}], Le, Vdb, Bef, St0) ->
%% that we save any variable that will be live after this BIF call.
MayFail = not erl_bifs:is_safe(erlang, Bif, length(As)),
- {Sis,Int0} = case St0#cg.in_catch andalso
- St0#cg.bfail =:= 0 andalso
- MayFail of
- true -> adjust_stack(Bef, Le#l.i, Le#l.i+1, Vdb);
- false -> {[],Bef}
- end,
+ {Sis,Int0} =
+ case MayFail of
+ true ->
+ maybe_adjust_stack(Bef, Le#l.i, Le#l.i+1, Vdb, St0);
+ false ->
+ {[],Bef}
+ end,
Int1 = clear_dead(Int0, Le#l.i, Vdb),
Reg = put_reg(V, Int1#sr.reg),
Int = Int1#sr{reg=Reg},
@@ -1366,11 +1367,7 @@ gc_bif_cg(Bif, As, [{var,V}], Le, Vdb, Bef, St0) ->
%% Currently, we are somewhat pessimistic in
%% that we save any variable that will be live after this BIF call.
- {Sis,Int0} =
- case St0#cg.in_catch andalso St0#cg.bfail =:= 0 of
- true -> adjust_stack(Bef, Le#l.i, Le#l.i+1, Vdb);
- false -> {[],Bef}
- end,
+ {Sis,Int0} = maybe_adjust_stack(Bef, Le#l.i, Le#l.i+1, Vdb, St0),
Int1 = clear_dead(Int0, Le#l.i, Vdb),
Reg = put_reg(V, Int1#sr.reg),
@@ -1515,8 +1512,7 @@ set_cg([{var,R}], {cons,Es}, Le, Vdb, Bef, St) ->
Int1 = Int0#sr{reg=put_reg(R, Int0#sr.reg)},
Ret = fetch_reg(R, Int1#sr.reg),
{[{put_list,S1,S2,Ret}], Int1, St};
-set_cg([{var,R}], {binary,Segs}, Le, Vdb, Bef,
- #cg{in_catch=InCatch, bfail=Bfail}=St) ->
+set_cg([{var,R}], {binary,Segs}, Le, Vdb, Bef, #cg{bfail=Bfail}=St) ->
%% At run-time, binaries are constructed in three stages:
%% 1) First the size of the binary is calculated.
%% 2) Then the binary is allocated.
@@ -1535,11 +1531,7 @@ set_cg([{var,R}], {binary,Segs}, Le, Vdb, Bef,
%% First generate the code that constructs each field.
Fail = {f,Bfail},
PutCode = cg_bin_put(Segs, Fail, Bef),
- {Sis,Int1} =
- case InCatch of
- true -> adjust_stack(Int0, Le#l.i, Le#l.i+1, Vdb);
- false -> {[],Int0}
- end,
+ {Sis,Int1} = maybe_adjust_stack(Int0, Le#l.i, Le#l.i+1, Vdb, St),
MaxRegs = max_reg(Bef#sr.reg),
Aft = clear_dead(Int1, Le#l.i, Vdb),
@@ -1548,14 +1540,11 @@ set_cg([{var,R}], {binary,Segs}, Le, Vdb, Bef,
{Sis++Code,Aft,St};
% Map single variable key
set_cg([{var,R}], {map,Op,Map,[{map_pair,{var,_}=K,V}]}, Le, Vdb, Bef,
- #cg{in_catch=InCatch,bfail=Bfail}=St) ->
+ #cg{bfail=Bfail}=St) ->
Fail = {f,Bfail},
- {Sis,Int0} =
- case InCatch of
- true -> adjust_stack(Bef, Le#l.i, Le#l.i+1, Vdb);
- false -> {[],Bef}
- end,
+ {Sis,Int0} = maybe_adjust_stack(Bef, Le#l.i, Le#l.i+1, Vdb, St),
+
SrcReg = cg_reg_arg(Map,Int0),
Line = line(Le#l.a),
@@ -1576,17 +1565,13 @@ set_cg([{var,R}], {map,Op,Map,[{map_pair,{var,_}=K,V}]}, Le, Vdb, Bef,
% Map (possibly) multiple literal keys
set_cg([{var,R}], {map,Op,Map,Es}, Le, Vdb, Bef,
- #cg{in_catch=InCatch,bfail=Bfail}=St) ->
+ #cg{bfail=Bfail}=St) ->
%% assert key literals
[] = [Var||{map_pair,{var,_}=Var,_} <- Es],
Fail = {f,Bfail},
- {Sis,Int0} =
- case InCatch of
- true -> adjust_stack(Bef, Le#l.i, Le#l.i+1, Vdb);
- false -> {[],Bef}
- end,
+ {Sis,Int0} = maybe_adjust_stack(Bef, Le#l.i, Le#l.i+1, Vdb, St),
SrcReg = cg_reg_arg(Map,Int0),
Line = line(Le#l.a),
@@ -2041,6 +2026,19 @@ trim_free([R|Rs0]) ->
end;
trim_free([]) -> [].
+%% maybe_adjust_stack(Bef, FirstBefore, LastFrom, Vdb, St) -> {[Ainstr],Aft}.
+%% Adjust the stack, but only if the code is inside a catch and not
+%% inside a guard. Use this funtion before instructions that may
+%% cause an exception.
+
+maybe_adjust_stack(Bef, Fb, Lf, Vdb, St) ->
+ case St of
+ #cg{in_catch=true,bfail=0} ->
+ adjust_stack(Bef, Fb, Lf, Vdb);
+ #cg{} ->
+ {[],Bef}
+ end.
+
%% adjust_stack(Bef, FirstBefore, LastFrom, Vdb) -> {[Ainstr],Aft}.
%% Do complete stack adjustment by compressing stack and adding
%% variables to be saved. Try to optimise ordering on stack by
diff --git a/lib/compiler/test/guard_SUITE.erl b/lib/compiler/test/guard_SUITE.erl
index 3f073d79cb..47eb1ba78b 100644
--- a/lib/compiler/test/guard_SUITE.erl
+++ b/lib/compiler/test/guard_SUITE.erl
@@ -34,7 +34,8 @@
tricky/1,rel_ops/1,rel_op_combinations/1,literal_type_tests/1,
basic_andalso_orelse/1,traverse_dcd/1,
check_qlc_hrl/1,andalso_semi/1,t_tuple_size/1,binary_part/1,
- bad_constants/1,bad_guards/1,scotland/1]).
+ bad_constants/1,bad_guards/1,scotland/1,
+ guard_in_catch/1]).
suite() -> [{ct_hooks,[ts_install_cth]}].
@@ -52,7 +53,7 @@ groups() ->
rel_ops,rel_op_combinations,
literal_type_tests,basic_andalso_orelse,traverse_dcd,
check_qlc_hrl,andalso_semi,t_tuple_size,binary_part,
- bad_constants,bad_guards,scotland]}].
+ bad_constants,bad_guards,scotland,guard_in_catch]}].
init_per_suite(Config) ->
Config.
@@ -1852,6 +1853,57 @@ do_scotland(Echo) ->
found(_, _) -> million.
+%% Building maps in a guard in a 'catch' would crash v3_codegen.
+
+guard_in_catch(_Config) ->
+ {'EXIT',{if_clause,_}} = do_guard_in_catch_map_1(#{}),
+ {'EXIT',{if_clause,_}} = do_guard_in_catch_map_1(#{a=>b}),
+ {'EXIT',{if_clause,_}} = do_guard_in_catch_map_1(atom),
+
+ {'EXIT',{if_clause,_}} = do_guard_in_catch_map_2(#{}),
+ {'EXIT',{if_clause,_}} = do_guard_in_catch_map_2(#{a=>b}),
+ {'EXIT',{if_clause,_}} = do_guard_in_catch_map_2(atom),
+
+ {'EXIT',{if_clause,_}} = (catch do_guard_in_catch_map_3()),
+
+ {'EXIT',{if_clause,_}} = do_guard_in_catch_bin(42),
+ {'EXIT',{if_clause,_}} = do_guard_in_catch_bin(<<1,2,3>>),
+ {'EXIT',{if_clause,_}} = do_guard_in_catch_bin(atom),
+ {'EXIT',{if_clause,_}} = do_guard_in_catch_bin(#{}),
+
+ ok.
+
+do_guard_in_catch_map_1(From) ->
+ catch
+ if
+ From#{[] => sufficient} ->
+ saint
+ end.
+
+do_guard_in_catch_map_2(From) ->
+ catch
+ if
+ From#{From => sufficient} ->
+ saint
+ end.
+
+do_guard_in_catch_map_3() ->
+ try
+ if [] -> solo end
+ catch
+ Friendly when Friendly#{0 => []} -> minutes
+ after
+ membership
+ end.
+
+do_guard_in_catch_bin(From) ->
+ %% Would not crash v3_codegen, but there would be an unnecessary
+ %% 'move' to a Y register.
+ catch
+ if
+ <<From:32>> ->
+ saint
+ end.
%% Call this function to turn off constant propagation.
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-03 18:03:02 +0000