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-rw-r--r--lib/compiler/src/Makefile1
-rw-r--r--lib/compiler/src/beam_except.erl149
-rw-r--r--lib/compiler/src/beam_utils.erl11
-rw-r--r--lib/compiler/src/compile.erl2
-rw-r--r--lib/compiler/src/compiler.app.src1
-rw-r--r--lib/compiler/src/sys_core_fold.erl6
-rw-r--r--lib/compiler/src/v3_codegen.erl37
-rw-r--r--lib/compiler/src/v3_kernel.erl22
-rw-r--r--lib/compiler/src/v3_life.erl34
9 files changed, 180 insertions, 83 deletions
diff --git a/lib/compiler/src/Makefile b/lib/compiler/src/Makefile
index 7a237608ad..3415517fff 100644
--- a/lib/compiler/src/Makefile
+++ b/lib/compiler/src/Makefile
@@ -53,6 +53,7 @@ MODULES = \
beam_dead \
beam_dict \
beam_disasm \
+ beam_except \
beam_flatten \
beam_jump \
beam_listing \
diff --git a/lib/compiler/src/beam_except.erl b/lib/compiler/src/beam_except.erl
new file mode 100644
index 0000000000..fb1a43cd9e
--- /dev/null
+++ b/lib/compiler/src/beam_except.erl
@@ -0,0 +1,149 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2011. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+
+-module(beam_except).
+-export([module/2]).
+
+%%% Rewrite certain calls to erlang:error/{1,2} to specialized
+%%% instructions:
+%%%
+%%% erlang:error({badmatch,Value}) => badmatch Value
+%%% erlang:error({case_clause,Value}) => case_end Value
+%%% erlang:error({try_clause,Value}) => try_case_end Value
+%%% erlang:error(if_clause) => if_end
+%%% erlang:error(function_clause, Args) => jump FuncInfoLabel
+%%%
+
+-import(lists, [reverse/1]).
+
+module({Mod,Exp,Attr,Fs0,Lc}, _Opt) ->
+ Fs = [function(F) || F <- Fs0],
+ {ok,{Mod,Exp,Attr,Fs,Lc}}.
+
+function({function,Name,Arity,CLabel,Is0}) ->
+ try
+ Is = function_1(Is0),
+ {function,Name,Arity,CLabel,Is}
+ catch
+ Class:Error ->
+ Stack = erlang:get_stacktrace(),
+ io:fwrite("Function: ~w/~w\n", [Name,Arity]),
+ erlang:raise(Class, Error, Stack)
+ end.
+
+-record(st,
+ {lbl, %func_info label
+ loc %location for func_info
+ }).
+
+function_1(Is0) ->
+ case Is0 of
+ [{label,Lbl},{line,Loc}|_] ->
+ St = #st{lbl=Lbl,loc=Loc},
+ translate(Is0, St, []);
+ [{label,_}|_] ->
+ %% No line numbers. The source must be a .S file.
+ %% There is no need to do anything.
+ Is0
+ end.
+
+translate([{call_ext,Ar,{extfunc,erlang,error,Ar}}=I|Is], St, Acc) ->
+ translate_1(Ar, I, Is, St, Acc);
+translate([{call_ext_only,Ar,{extfunc,erlang,error,Ar}}=I|Is], St, Acc) ->
+ translate_1(Ar, I, Is, St, Acc);
+translate([{call_ext_last,Ar,{extfunc,erlang,error,Ar},_}=I|Is], St, Acc) ->
+ translate_1(Ar, I, Is, St, Acc);
+translate([I|Is], St, Acc) ->
+ translate(Is, St, [I|Acc]);
+translate([], _, Acc) ->
+ reverse(Acc).
+
+translate_1(Ar, I, Is, St, [{line,_}=Line|Acc1]=Acc0) ->
+ case dig_out(Ar, Acc1) of
+ no ->
+ translate(Is, St, [I|Acc0]);
+ {yes,function_clause,Acc2} ->
+ case {Line,St} of
+ {{line,Loc},#st{lbl=Fi,loc=Loc}} ->
+ Instr = {jump,{f,Fi}},
+ translate(Is, St, [Instr|Acc2]);
+ {_,_} ->
+ %% This must be "error(function_clause, Args)" in
+ %% the Erlang source code. Don't translate.
+ translate(Is, St, [I|Acc0])
+ end;
+ {yes,Instr,Acc2} ->
+ translate(Is, St, [Instr,Line|Acc2])
+ end.
+
+dig_out(Ar, [{kill,_}|Is]) ->
+ dig_out(Ar, Is);
+dig_out(1, [{block,Bl0}|Is]) ->
+ case dig_out_block(reverse(Bl0)) of
+ no -> no;
+ {yes,What,[]} ->
+ {yes,What,Is};
+ {yes,What,Bl} ->
+ {yes,What,[{block,Bl}|Is]}
+ end;
+dig_out(2, [{block,Bl}|Is]) ->
+ case dig_out_block_fc(Bl) of
+ no -> no;
+ {yes,What} -> {yes,What,Is}
+ end;
+dig_out(_, _) -> no.
+
+dig_out_block([{set,[{x,0}],[{atom,if_clause}],move}]) ->
+ {yes,if_end,[]};
+dig_out_block([{set,[{x,0}],[{literal,{Exc,Value}}],move}|Is]) ->
+ translate_exception(Exc, {literal,Value}, Is, 0);
+dig_out_block([{set,[{x,0}],[Tuple],move},
+ {set,[],[Value],put},
+ {set,[],[{atom,Exc}],put},
+ {set,[Tuple],[],{put_tuple,2}}|Is]) ->
+ translate_exception(Exc, Value, Is, 3);
+dig_out_block([{set,[],[Value],put},
+ {set,[],[{atom,Exc}],put},
+ {set,[{x,0}],[],{put_tuple,2}}|Is]) ->
+ translate_exception(Exc, Value, Is, 3);
+dig_out_block(_) -> no.
+
+translate_exception(badmatch, Val, Is, Words) ->
+ {yes,{badmatch,Val},fix_block(Is, Words)};
+translate_exception(case_clause, Val, Is, Words) ->
+ {yes,{case_end,Val},fix_block(Is, Words)};
+translate_exception(try_clause, Val, Is, Words) ->
+ {yes,{try_case_end,Val},fix_block(Is, Words)};
+translate_exception(_, _, _, _) -> no.
+
+fix_block(Is, 0) ->
+ reverse(Is);
+fix_block(Is0, Words) ->
+ [{set,[],[],{alloc,Live,{F1,F2,Needed,F3}}}|Is] = reverse(Is0),
+ [{set,[],[],{alloc,Live,{F1,F2,Needed-Words,F3}}}|Is].
+
+dig_out_block_fc([{set,[],[],{alloc,Live,_}}|Bl]) ->
+ dig_out_fc(Bl, Live-1, nil);
+dig_out_block_fc(_) -> no.
+
+dig_out_fc([{set,[Dst],[{x,Reg},Dst0],put_list}|Is], Reg, Dst0) ->
+ dig_out_fc(Is, Reg-1, Dst);
+dig_out_fc([{set,[{x,0}],[{atom,function_clause}],move}], -1, {x,1}) ->
+ {yes,function_clause};
+dig_out_fc(_, _, _) -> no.
diff --git a/lib/compiler/src/beam_utils.erl b/lib/compiler/src/beam_utils.erl
index a631b8cd69..116ede0bc9 100644
--- a/lib/compiler/src/beam_utils.erl
+++ b/lib/compiler/src/beam_utils.erl
@@ -474,8 +474,15 @@ check_liveness(R, [{make_fun2,_,_,_,NumFree}|Is], St) ->
end;
check_liveness(R, [{try_end,Y}|Is], St) ->
case R of
- Y -> {killed,St};
- _ -> check_liveness(R, Is, St)
+ Y ->
+ {killed,St};
+ {y,_} ->
+ %% y registers will be used if an exception occurs and
+ %% control transfers to the label given in the previous
+ %% try/2 instruction.
+ {used,St};
+ _ ->
+ check_liveness(R, Is, St)
end;
check_liveness(R, [{catch_end,Y}|Is], St) ->
case R of
diff --git a/lib/compiler/src/compile.erl b/lib/compiler/src/compile.erl
index a17a10046e..9b505ad15c 100644
--- a/lib/compiler/src/compile.erl
+++ b/lib/compiler/src/compile.erl
@@ -629,6 +629,8 @@ asm_passes() ->
[{unless,no_postopt,
[{pass,beam_block},
{iff,dblk,{listing,"block"}},
+ {unless,no_except,{pass,beam_except}},
+ {iff,dexcept,{listing,"except"}},
{unless,no_bopt,{pass,beam_bool}},
{iff,dbool,{listing,"bool"}},
{unless,no_topt,{pass,beam_type}},
diff --git a/lib/compiler/src/compiler.app.src b/lib/compiler/src/compiler.app.src
index fb06f2521c..1133882728 100644
--- a/lib/compiler/src/compiler.app.src
+++ b/lib/compiler/src/compiler.app.src
@@ -28,6 +28,7 @@
beam_dead,
beam_dict,
beam_disasm,
+ beam_except,
beam_flatten,
beam_jump,
beam_listing,
diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl
index 6ea67741fa..5b155398dc 100644
--- a/lib/compiler/src/sys_core_fold.erl
+++ b/lib/compiler/src/sys_core_fold.erl
@@ -2641,9 +2641,9 @@ bsm_leftmost_2([_|Ps], Cs, N, Pos) ->
bsm_leftmost_2([], Cs, _, Pos) ->
bsm_leftmost_1(Cs, Pos).
-%% bsm_notempty(Cs, Pos) -> true|false
+%% bsm_nonempty(Cs, Pos) -> true|false
%% Check if at least one of the clauses matches a non-empty
-%% binary in the given argumet position.
+%% binary in the given argument position.
%%
bsm_nonempty([#c_clause{pats=Ps}|Cs], Pos) ->
case nth(Pos, Ps) of
@@ -2704,7 +2704,7 @@ bsm_ensure_no_partition_2([P|_], 1, _, Vstate, State) ->
%%
%% But if the clauses can't be freely rearranged, as in
%%
- %% b(Var, <<>>) -> ...
+ %% b(Var, <<X>>) -> ...
%% b(1, 2) -> ...
%%
%% we do have a problem.
diff --git a/lib/compiler/src/v3_codegen.erl b/lib/compiler/src/v3_codegen.erl
index e7dae67085..6623485609 100644
--- a/lib/compiler/src/v3_codegen.erl
+++ b/lib/compiler/src/v3_codegen.erl
@@ -53,7 +53,6 @@
%% Main codegen structure.
-record(cg, {lcount=1, %Label counter
- finfo, %Function info label
bfail, %Fail label for BIFs
break, %Break label
recv, %Receive label
@@ -126,7 +125,6 @@ cg_fun(Les, Hvs, Vdb, AtomMod, NameArity, Anno, St0) ->
stk=[]}, 0, Vdb),
{B,_Aft,St} = cg_list(Les, 0, Vdb, Bef,
St3#cg{bfail=0,
- finfo=Fi,
ultimate_failure=UltimateMatchFail,
is_top_block=true}),
{Name,Arity} = NameArity,
@@ -147,8 +145,6 @@ cg({match,M,Rs}, Le, Vdb, Bef, St) ->
match_cg(M, Rs, Le, Vdb, Bef, St);
cg({guard_match,M,Rs}, Le, Vdb, Bef, St) ->
guard_match_cg(M, Rs, Le, Vdb, Bef, St);
-cg({match_fail,F}, Le, Vdb, Bef, St) ->
- match_fail_cg(F, Le, Vdb, Bef, St);
cg({call,Func,As,Rs}, Le, Vdb, Bef, St) ->
call_cg(Func, As, Rs, Le, Vdb, Bef, St);
cg({enter,Func,As}, Le, Vdb, Bef, St) ->
@@ -294,39 +290,6 @@ match_cg({block,Es}, Le, _Fail, Bef, St) ->
Int = clear_dead(Bef, Le#l.i, Le#l.vdb),
block_cg(Es, Le, Int, St).
-%% match_fail_cg(FailReason, Le, Vdb, StackReg, State) ->
-%% {[Ainstr],StackReg,State}.
-%% Generate code for the match_fail "call". N.B. there is no generic
-%% case for when the fail value has been created elsewhere.
-
-match_fail_cg({function_clause,As}, Le, Vdb, Bef, St) ->
- %% Must have the args in {x,0}, {x,1},...
- {Sis,Int} = cg_setup_call(As, Bef, Le#l.i, Vdb),
- {Sis ++ [{jump,{f,St#cg.finfo}}],
- Int#sr{reg=clear_regs(Int#sr.reg)},St};
-match_fail_cg({badmatch,Term}, Le, Vdb, Bef, St) ->
- R = cg_reg_arg(Term, Bef),
- Int0 = clear_dead(Bef, Le#l.i, Vdb),
- {Sis,Int} = adjust_stack(Int0, Le#l.i, Le#l.i+1, Vdb),
- {Sis ++ [line(Le),{badmatch,R}],
- Int#sr{reg=clear_regs(Int0#sr.reg)},St};
-match_fail_cg({case_clause,Reason}, Le, Vdb, Bef, St) ->
- R = cg_reg_arg(Reason, Bef),
- Int0 = clear_dead(Bef, Le#l.i, Vdb),
- {Sis,Int} = adjust_stack(Int0, Le#l.i, Le#l.i+1, Vdb),
- {Sis++[line(Le),{case_end,R}],
- Int#sr{reg=clear_regs(Bef#sr.reg)},St};
-match_fail_cg(if_clause, Le, Vdb, Bef, St) ->
- Int0 = clear_dead(Bef, Le#l.i, Vdb),
- {Sis,Int1} = adjust_stack(Int0, Le#l.i, Le#l.i+1, Vdb),
- {Sis++[line(Le),if_end],Int1#sr{reg=clear_regs(Int1#sr.reg)},St};
-match_fail_cg({try_clause,Reason}, Le, Vdb, Bef, St) ->
- R = cg_reg_arg(Reason, Bef),
- Int0 = clear_dead(Bef, Le#l.i, Vdb),
- {Sis,Int} = adjust_stack(Int0, Le#l.i, Le#l.i+1, Vdb),
- {Sis ++ [line(Le),{try_case_end,R}],
- Int#sr{reg=clear_regs(Int0#sr.reg)},St}.
-
%% bsm_rename_ctx([Clause], Var) -> [Clause]
%% We know from an annotation that the register for a binary can
%% be reused for the match context because the two are not truly
diff --git a/lib/compiler/src/v3_kernel.erl b/lib/compiler/src/v3_kernel.erl
index d76291f57f..f2eaa37617 100644
--- a/lib/compiler/src/v3_kernel.erl
+++ b/lib/compiler/src/v3_kernel.erl
@@ -83,6 +83,7 @@
-import(lists, [map/2,foldl/3,foldr/3,mapfoldl/3,splitwith/2,member/2,
keymember/3,keyfind/3]).
-import(ordsets, [add_element/2,del_element/2,union/2,union/1,subtract/2]).
+-import(cerl, [c_tuple/1]).
-include("core_parse.hrl").
-include("v3_kernel.hrl").
@@ -422,10 +423,11 @@ expr(#c_call{anno=A,module=M0,name=F0,args=Cargs}, Sub, St0) ->
end;
expr(#c_primop{anno=A,name=#c_literal{val=match_fail},args=Cargs0}, Sub, St0) ->
Cargs = translate_match_fail(Cargs0, Sub, A, St0),
- %% This special case will disappear.
{Kargs,Ap,St} = atomic_list(Cargs, Sub, St0),
Ar = length(Cargs),
- Call = #k_call{anno=A,op=#k_internal{name=match_fail,arity=Ar},args=Kargs},
+ Call = #k_call{anno=A,op=#k_remote{mod=#k_atom{val=erlang},
+ name=#k_atom{val=error},
+ arity=Ar},args=Kargs},
{Call,Ap,St};
expr(#c_primop{anno=A,name=#c_literal{val=N},args=Cargs}, Sub, St0) ->
{Kargs,Ap,St1} = atomic_list(Cargs, Sub, St0),
@@ -455,14 +457,14 @@ expr(#ireceive_accept{anno=A}, _Sub, St) -> {#k_receive_accept{anno=A},[],St}.
translate_match_fail(Args, Sub, Anno, St) ->
case Args of
[#c_tuple{es=[#c_literal{val=function_clause}|As]}] ->
- translate_match_fail_1(Anno, Args, As, Sub, St);
+ translate_match_fail_1(Anno, As, Sub, St);
[#c_literal{val=Tuple}] when is_tuple(Tuple) ->
%% The inliner may have created a literal out of
%% the original #c_tuple{}.
case tuple_to_list(Tuple) of
[function_clause|As0] ->
As = [#c_literal{val=E} || E <- As0],
- translate_match_fail_1(Anno, Args, As, Sub, St);
+ translate_match_fail_1(Anno, As, Sub, St);
_ ->
Args
end;
@@ -471,7 +473,7 @@ translate_match_fail(Args, Sub, Anno, St) ->
Args
end.
-translate_match_fail_1(Anno, Args, As, Sub, #kern{ff=FF}) ->
+translate_match_fail_1(Anno, As, Sub, #kern{ff=FF}) ->
AnnoFunc = case keyfind(function_name, 1, Anno) of
false ->
none; %Force rewrite.
@@ -481,10 +483,10 @@ translate_match_fail_1(Anno, Args, As, Sub, #kern{ff=FF}) ->
case {AnnoFunc,FF} of
{Same,Same} ->
%% Still in the correct function.
- Args;
+ translate_fc(As);
{{F,_},F} ->
%% Still in the correct function.
- Args;
+ translate_fc(As);
_ ->
%% Wrong function or no function_name annotation.
%%
@@ -493,9 +495,12 @@ translate_match_fail_1(Anno, Args, As, Sub, #kern{ff=FF}) ->
%% the current function). match_fail(function_clause) will
%% only work at the top level of the function it was originally
%% defined in, so we will need to rewrite it to a case_clause.
- [#c_tuple{es=[#c_literal{val=case_clause},#c_tuple{es=As}]}]
+ [c_tuple([#c_literal{val=case_clause},c_tuple(As)])]
end.
+translate_fc(Args) ->
+ [#c_literal{val=function_clause},make_list(Args)].
+
%% call_type(Module, Function, Arity) -> call | bif | apply | error.
%% Classify the call.
call_type(#c_literal{val=M}, #c_literal{val=F}, Ar) when is_atom(M), is_atom(F) ->
@@ -1494,7 +1499,6 @@ iletrec_funs_gen(Fs, FreeVs, St) ->
%% is_exit_expr(Kexpr) -> boolean().
%% Test whether Kexpr always exits and never returns.
-is_exit_expr(#k_call{op=#k_internal{name=match_fail,arity=1}}) -> true;
is_exit_expr(#k_receive_next{}) -> true;
is_exit_expr(_) -> false.
diff --git a/lib/compiler/src/v3_life.erl b/lib/compiler/src/v3_life.erl
index fac9a9843d..93f8034230 100644
--- a/lib/compiler/src/v3_life.erl
+++ b/lib/compiler/src/v3_life.erl
@@ -89,19 +89,8 @@ function(#k_fdef{anno=#k{a=Anno},func=F,arity=Ar,vars=Vs,body=Kb}) ->
end.
%% body(Kbody, I, Vdb) -> {[Expr],MaxI,Vdb}.
-%% Handle a body, need special cases for transforming match_fails.
-%% We KNOW that they only occur last in a body.
-
-body(#k_seq{arg=#k_put{anno=Pa,arg=Arg,ret=[R]},
- body=#k_enter{anno=Ea,op=#k_internal{name=match_fail,arity=1},
- args=[R]}},
- I, Vdb0) ->
- Vdb1 = use_vars(Pa#k.us, I, Vdb0), %All used here
- {[match_fail(Arg, I, Pa#k.a ++ Ea#k.a)],I,Vdb1};
-body(#k_enter{anno=Ea,op=#k_internal{name=match_fail,arity=1},args=[Arg]},
- I, Vdb0) ->
- Vdb1 = use_vars(Ea#k.us, I, Vdb0),
- {[match_fail(Arg, I, Ea#k.a)],I,Vdb1};
+%% Handle a body.
+
body(#k_seq{arg=Ke,body=Kb}, I, Vdb0) ->
%%ok = io:fwrite("life ~w:~p~n", [?LINE,{Ke,I,Vdb0}]),
A = get_kanno(Ke),
@@ -353,25 +342,6 @@ guard_clause(#k_guard_clause{anno=A,guard=Kg,body=Kb}, Ls, I, Ctxt, Vdb0) ->
i=I,vdb=use_vars((get_kanno(Kg))#k.us, I+2, Vdb1),
a=A#k.a}.
-%% match_fail(FailValue, I, Anno) -> Expr.
-%% Generate the correct match_fail instruction. N.B. there is no
-%% generic case for when the fail value has been created elsewhere.
-
-match_fail(#k_literal{anno=Anno,val={Atom,Val}}, I, A) when is_atom(Atom) ->
- match_fail(#k_tuple{anno=Anno,es=[#k_atom{val=Atom},#k_literal{val=Val}]}, I, A);
-match_fail(#k_literal{anno=Anno,val={Atom}}, I, A) when is_atom(Atom) ->
- match_fail(#k_tuple{anno=Anno,es=[#k_atom{val=Atom}]}, I, A);
-match_fail(#k_tuple{es=[#k_atom{val=function_clause}|As]}, I, A) ->
- #l{ke={match_fail,{function_clause,literal_list(As, [])}},i=I,a=A};
-match_fail(#k_tuple{es=[#k_atom{val=badmatch},Val]}, I, A) ->
- #l{ke={match_fail,{badmatch,literal(Val, [])}},i=I,a=A};
-match_fail(#k_tuple{es=[#k_atom{val=case_clause},Val]}, I, A) ->
- #l{ke={match_fail,{case_clause,literal(Val, [])}},i=I,a=A};
-match_fail(#k_atom{val=if_clause}, I, A) ->
- #l{ke={match_fail,if_clause},i=I,a=A};
-match_fail(#k_tuple{es=[#k_atom{val=try_clause},Val]}, I, A) ->
- #l{ke={match_fail,{try_clause,literal(Val, [])}},i=I,a=A}.
-
%% type(Ktype) -> Type.
type(k_literal) -> literal;
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-18 23:49:21 +0000