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-rw-r--r--lib/compiler/src/v3_codegen.erl155
1 files changed, 84 insertions, 71 deletions
diff --git a/lib/compiler/src/v3_codegen.erl b/lib/compiler/src/v3_codegen.erl
index 55e3c58d2a..812e85553f 100644
--- a/lib/compiler/src/v3_codegen.erl
+++ b/lib/compiler/src/v3_codegen.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1999-2011. All Rights Reserved.
+%% Copyright Ericsson AB 1999-2012. 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
@@ -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
@@ -79,9 +78,10 @@ module({Mod,Exp,Attr,Forms}, Options) ->
functions(Forms, AtomMod) ->
mapfoldl(fun (F, St) -> function(F, AtomMod, St) end, #cg{lcount=1}, Forms).
-function({function,Name,Arity,Asm0,Vb,Vdb}, AtomMod, St0) ->
+function({function,Name,Arity,Asm0,Vb,Vdb,Anno}, AtomMod, St0) ->
try
- {Asm,EntryLabel,St} = cg_fun(Vb, Asm0, Vdb, AtomMod, {Name,Arity}, St0),
+ {Asm,EntryLabel,St} = cg_fun(Vb, Asm0, Vdb, AtomMod,
+ {Name,Arity}, Anno, St0),
Func = {function,Name,Arity,EntryLabel,Asm},
{Func,St}
catch
@@ -93,7 +93,7 @@ function({function,Name,Arity,Asm0,Vb,Vdb}, AtomMod, St0) ->
%% cg_fun([Lkexpr], [HeadVar], Vdb, State) -> {[Ainstr],State}
-cg_fun(Les, Hvs, Vdb, AtomMod, NameArity, St0) ->
+cg_fun(Les, Hvs, Vdb, AtomMod, NameArity, Anno, St0) ->
{Fi,St1} = new_label(St0), %FuncInfo label
{Fl,St2} = local_func_label(NameArity, St1),
@@ -125,11 +125,10 @@ cg_fun(Les, Hvs, Vdb, AtomMod, NameArity, 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,
- Asm = [{label,Fi},{func_info,AtomMod,{atom,Name},Arity},
+ Asm = [{label,Fi},line(Anno),{func_info,AtomMod,{atom,Name},Arity},
{label,Fl}|B++[{label,UltimateMatchFail},if_end]],
{Asm,Fl,St}.
@@ -146,8 +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) ->
@@ -293,39 +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 ++ [{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++[{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++[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 ++ [{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
@@ -406,6 +370,7 @@ bsm_rename_ctx(#l{ke={test,_,_}}=L, _, _, _) -> L;
bsm_rename_ctx(#l{ke={bif,_,_,_}}=L, _, _, _) -> L;
bsm_rename_ctx(#l{ke={gc_bif,_,_,_}}=L, _, _, _) -> L;
bsm_rename_ctx(#l{ke={set,_,_}}=L, _, _, _) -> L;
+bsm_rename_ctx(#l{ke={call,_,_,_}}=L, _, _, _) -> L;
bsm_rename_ctx(#l{ke={block,_}}=L, Old, _, false) ->
%% This block is not inside a protected. The match context variable cannot
%% possibly be live inside the block.
@@ -1047,7 +1012,7 @@ call_cg({var,_V} = Var, As, Rs, Le, Vdb, Bef, St0) ->
%% Build complete code and final stack/register state.
Arity = length(As),
{Frees,Aft} = free_dead(clear_dead(Int#sr{reg=Reg}, Le#l.i, Vdb)),
- {Sis ++ Frees ++ [{call_fun,Arity}],Aft,
+ {Sis ++ Frees ++ [line(Le),{call_fun,Arity}],Aft,
need_stack_frame(St0)};
call_cg({remote,Mod,Name}, As, Rs, Le, Vdb, Bef, St0)
when element(1, Mod) =:= var;
@@ -1057,11 +1022,10 @@ call_cg({remote,Mod,Name}, As, Rs, Le, Vdb, Bef, St0)
Reg = load_vars(Rs, clear_regs(Int#sr.reg)),
%% Build complete code and final stack/register state.
Arity = length(As),
- Call = {apply,Arity},
St = need_stack_frame(St0),
%%{Call,St1} = build_call(Func, Arity, St0),
{Frees,Aft} = free_dead(clear_dead(Int#sr{reg=Reg}, Le#l.i, Vdb)),
- {Sis ++ Frees ++ [Call],Aft,St};
+ {Sis ++ Frees ++ [line(Le),{apply,Arity}],Aft,St};
call_cg(Func, As, Rs, Le, Vdb, Bef, St0) ->
case St0 of
#cg{bfail=Fail} when Fail =/= 0 ->
@@ -1091,7 +1055,7 @@ call_cg(Func, As, Rs, Le, Vdb, Bef, St0) ->
Arity = length(As),
{Call,St1} = build_call(Func, Arity, St0),
{Frees,Aft} = free_dead(clear_dead(Int#sr{reg=Reg}, Le#l.i, Vdb)),
- {Sis ++ Frees ++ Call,Aft,St1}
+ {Sis ++ Frees ++ [line(Le)|Call],Aft,St1}
end.
build_call({remote,{atom,erlang},{atom,'!'}}, 2, St0) ->
@@ -1118,7 +1082,7 @@ enter_cg({var,_V} = Var, As, Le, Vdb, Bef, St0) ->
{Sis,Int} = cg_setup_call(As++[Var], Bef, Le#l.i, Vdb),
%% Build complete code and final stack/register state.
Arity = length(As),
- {Sis ++ [{call_fun,Arity},return],
+ {Sis ++ [line(Le),{call_fun,Arity},return],
clear_dead(Int#sr{reg=clear_regs(Int#sr.reg)}, Le#l.i, Vdb),
need_stack_frame(St0)};
enter_cg({remote,Mod,Name}, As, Le, Vdb, Bef, St0)
@@ -1127,9 +1091,8 @@ enter_cg({remote,Mod,Name}, As, Le, Vdb, Bef, St0)
{Sis,Int} = cg_setup_call(As++[Mod,Name], Bef, Le#l.i, Vdb),
%% Build complete code and final stack/register state.
Arity = length(As),
- Call = {apply_only,Arity},
St = need_stack_frame(St0),
- {Sis ++ [Call],
+ {Sis ++ [line(Le),{apply_only,Arity}],
clear_dead(Int#sr{reg=clear_regs(Int#sr.reg)}, Le#l.i, Vdb),
St};
enter_cg(Func, As, Le, Vdb, Bef, St0) ->
@@ -1137,7 +1100,8 @@ enter_cg(Func, As, Le, Vdb, Bef, St0) ->
%% Build complete code and final stack/register state.
Arity = length(As),
{Call,St1} = build_enter(Func, Arity, St0),
- {Sis ++ Call,
+ Line = enter_line(Func, Arity, Le),
+ {Sis ++ Line ++ Call,
clear_dead(Int#sr{reg=clear_regs(Int#sr.reg)}, Le#l.i, Vdb),
St1}.
@@ -1153,6 +1117,23 @@ build_enter(Name, Arity, St0) when is_atom(Name) ->
{Lbl,St1} = local_func_label(Name, Arity, St0),
{[{call_only,Arity,{f,Lbl}}],St1}.
+enter_line({remote,{atom,Mod},{atom,Name}}, Arity, Le) ->
+ case erl_bifs:is_safe(Mod, Name, Arity) of
+ false ->
+ %% Tail-recursive call, possibly to a BIF.
+ %% We'll need a line instruction in case the
+ %% BIF call fails.
+ [line(Le)];
+ true ->
+ %% Call to a safe BIF. Since it cannot fail,
+ %% we don't need any line instruction here.
+ []
+ end;
+enter_line(_, _, _) ->
+ %% Tail-recursive call to a local function. A line
+ %% instruction will not be useful.
+ [].
+
%% local_func_label(Name, Arity, State) -> {Label,State'}
%% local_func_label({Name,Arity}, State) -> {Label,State'}
%% Get the function entry label for a local function.
@@ -1226,9 +1207,10 @@ 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.
+ MayFail = not erl_bifs:is_safe(erlang, Bif, length(As)),
{Sis,Int0} = case St0#cg.in_catch andalso
St0#cg.bfail =:= 0 andalso
- not erl_bifs:is_safe(erlang, Bif, length(As)) of
+ MayFail of
true -> adjust_stack(Bef, Le#l.i, Le#l.i+1, Vdb);
false -> {[],Bef}
end,
@@ -1237,7 +1219,14 @@ bif_cg(Bif, As, [{var,V}], Le, Vdb, Bef, St0) ->
Int = Int1#sr{reg=Reg},
Dst = fetch_reg(V, Reg),
BifFail = {f,St0#cg.bfail},
- {Sis++[{bif,Bif,BifFail,Ars,Dst}],
+ %% We need a line instructions for BIFs that may fail in a body.
+ Line = case BifFail of
+ {f,0} when MayFail ->
+ [line(Le)];
+ _ ->
+ []
+ end,
+ {Sis++Line++[{bif,Bif,BifFail,Ars,Dst}],
clear_dead(Int, Le#l.i, Vdb), St0}.
@@ -1266,7 +1255,11 @@ gc_bif_cg(Bif, As, [{var,V}], Le, Vdb, Bef, St0) ->
Int = Int1#sr{reg=Reg},
Dst = fetch_reg(V, Reg),
BifFail = {f,St0#cg.bfail},
- {Sis++[{gc_bif,Bif,BifFail,max_reg(Bef#sr.reg),Ars,Dst}],
+ Line = case BifFail of
+ {f,0} -> [line(Le)];
+ {f,_} -> []
+ end,
+ {Sis++Line++[{gc_bif,Bif,BifFail,max_reg(Bef#sr.reg),Ars,Dst}],
clear_dead(Int, Le#l.i, Vdb), St0}.
%% recv_loop_cg(TimeOut, ReceiveVar, ReceiveMatch, TimeOutExprs,
@@ -1284,7 +1277,7 @@ recv_loop_cg(Te, Rvar, Rm, Tes, Rs, Le, Vdb, Bef, St0) ->
{Wis,Taft,St6} = cg_recv_wait(Te, Tes, Le#l.i, Int1, St5),
Int2 = sr_merge(Raft, Taft), %Merge stack/registers
Reg = load_vars(Rs, Int2#sr.reg),
- {Sis ++ Ris ++ [{label,Tl}] ++ Wis ++ [{label,Bl}],
+ {Sis ++ [line(Le)] ++ Ris ++ [{label,Tl}] ++ Wis ++ [{label,Bl}],
clear_dead(Int2#sr{reg=Reg}, Le#l.i, Vdb),
St6#cg{break=St0#cg.break,recv=St0#cg.recv}}.
@@ -1431,20 +1424,7 @@ set_cg([{var,R}], Con, Le, Vdb, Bef, St) ->
Other ->
[{move,Other,Ret}]
end,
- {Ais,clear_dead(Int, Le#l.i, Vdb),St};
-set_cg([], {binary,Segs}, Le, Vdb, Bef, St) ->
- Fail = {f,St#cg.bfail},
- Target = find_scratch_reg(Bef#sr.reg),
- Temp = find_scratch_reg(put_reg(Target, Bef#sr.reg)),
- PutCode = cg_bin_put(Segs, Fail, Bef),
- MaxRegs = max_reg(Bef#sr.reg),
- Code = cg_binary(PutCode, Target, Temp, Fail, MaxRegs, Le#l.a),
- Aft = clear_dead(Bef, Le#l.i, Vdb),
- {Code,Aft,St};
-set_cg([], _, Le, Vdb, Bef, St) ->
- %% This should have been stripped by compiler, just cleanup.
- {[],clear_dead(Bef, Le#l.i, Vdb), St}.
-
+ {Ais,clear_dead(Int, Le#l.i, Vdb),St}.
%%%
%%% Code generation for constructing binaries.
@@ -1463,12 +1443,13 @@ cg_binary([{bs_put_binary,Fail,{atom,all},U,_Flags,Src}|PutCode],
{bs_append,Fail,Target,0,MaxRegs,U,Src,BinFlags,Target}
end] ++ PutCode,
cg_bin_opt(Code);
-cg_binary(PutCode, Target, Temp, Fail, MaxRegs, _Anno) ->
+cg_binary(PutCode, Target, Temp, Fail, MaxRegs, Anno) ->
+ Line = line(Anno),
Live = cg_live(Target, MaxRegs),
{InitOp,SzCode} = cg_binary_size(PutCode, Target, Temp, Fail, Live),
- Code = SzCode ++ [{InitOp,Fail,Target,0,MaxRegs,
- {field_flags,[]},Target}|PutCode],
+ Code = [Line|SzCode] ++ [{InitOp,Fail,Target,0,MaxRegs,
+ {field_flags,[]},Target}|PutCode],
cg_bin_opt(Code).
cg_live({x,X}, MaxRegs) when X =:= MaxRegs -> MaxRegs+1;
@@ -2052,6 +2033,38 @@ drop_catch(Tag, [Other|Stk]) -> [Other|drop_catch(Tag, Stk)].
new_label(#cg{lcount=Next}=St) ->
{Next,St#cg{lcount=Next+1}}.
+%% line(Le) -> {line,[] | {location,File,Line}}
+%% Create a line instruction, containing information about
+%% the current filename and line number. A line information
+%% instruction should be placed before any operation that could
+%% cause an exception.
+
+line(#l{a=Anno}) ->
+ line(Anno);
+line([Line,{file,Name}]) when is_integer(Line) ->
+ line_1(Name, Line);
+line([_|_]=A) ->
+ {Name,Line} = find_loc(A, no_file, 0),
+ line_1(Name, Line);
+line([]) ->
+ {line,[]}.
+
+line_1(no_file, _) ->
+ {line,[]};
+line_1(_, 0) ->
+ %% Missing line number or line number 0.
+ {line,[]};
+line_1(Name, Line) ->
+ {line,[{location,Name,Line}]}.
+
+find_loc([Line|T], File, _) when is_integer(Line) ->
+ find_loc(T, File, Line);
+find_loc([{file,File}|T], _, Line) ->
+ find_loc(T, File, Line);
+find_loc([_|T], File, Line) ->
+ find_loc(T, File, Line);
+find_loc([], File, Line) -> {File,Line}.
+
flatmapfoldl(F, Accu0, [Hd|Tail]) ->
{R,Accu1} = F(Hd, Accu0),
{Rs,Accu2} = flatmapfoldl(F, Accu1, Tail),
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-26 07:29:42 +0000