diff options
| -rw-r--r-- | lib/compiler/src/beam_except.erl | 51 | ||||
| -rw-r--r-- | lib/compiler/test/beam_except_SUITE.erl | 12 |
2 files changed, 44 insertions, 19 deletions
diff --git a/lib/compiler/src/beam_except.erl b/lib/compiler/src/beam_except.erl index 26b193a35b..254a716b81 100644 --- a/lib/compiler/src/beam_except.erl +++ b/lib/compiler/src/beam_except.erl @@ -31,7 +31,7 @@ %%% erlang:error(function_clause, Args) => jump FuncInfoLabel %%% --import(lists, [reverse/1,seq/2,splitwith/2]). +-import(lists, [reverse/1,reverse/2,seq/2,splitwith/2]). -spec module(beam_utils:module_code(), [compile:option()]) -> {'ok',beam_utils:module_code()}. @@ -53,7 +53,7 @@ function({function,Name,Arity,CLabel,Is0}) -> -record(st, {lbl :: beam_asm:label(), %func_info label loc :: [_], %location for func_info - arity :: arity() %arity for function + arity :: arity() %arity for function }). function_1(Is0) -> @@ -150,10 +150,15 @@ dig_out_fc(Arity, Is0) -> (_) -> true end, Is0), {Regs,Acc} = dig_out_fc_1(reverse(Is), Regs0, Acc0), - case is_fc(Arity, Regs) of - true -> - {yes,function_clause,Acc}; - false -> + case Regs of + #{{x,0}:={atom,function_clause},{x,1}:=Args} -> + case moves_from_stack(Args, 0, []) of + {Moves,Arity} -> + {yes,function_clause,reverse(Moves, Acc)}; + {_,_} -> + no + end; + #{} -> no end. @@ -187,22 +192,30 @@ dig_out_fc_block([], Regs) -> Regs. prune_xregs(Live, Regs) -> maps:filter(fun({x,X}, _) -> X < Live end, Regs). -is_fc(Arity, Regs) -> - case Regs of - #{{x,0}:={atom,function_clause},{x,1}:=Args} -> - is_fc_1(Args, 0) =:= Arity; - #{} -> - false - end. - -is_fc_1({cons,{arg,I},T}, I) -> - is_fc_1(T, I+1); -is_fc_1(nil, I) -> - I; -is_fc_1(_, _) -> -1. +moves_from_stack({cons,{arg,N},_}, I, _Acc) when N =/= I -> + %% Wrong argument. Give up. + {[],-1}; +moves_from_stack({cons,H,T}, I, Acc) -> + case H of + {arg,I} -> + moves_from_stack(T, I+1, Acc); + _ -> + moves_from_stack(T, I+1, [{move,H,{x,I}}|Acc]) + end; +moves_from_stack(nil, I, Acc) -> + {reverse(Acc),I}; +moves_from_stack({literal,[H|T]}, I, Acc) -> + Cons = {cons,tag_literal(H),tag_literal(T)}, + moves_from_stack(Cons, I, Acc). get_reg(R, Regs) -> case Regs of #{R:=Val} -> Val; #{} -> R end. + +tag_literal([]) -> nil; +tag_literal(T) when is_atom(T) -> {atom,T}; +tag_literal(T) when is_float(T) -> {float,T}; +tag_literal(T) when is_integer(T) -> {integer,T}; +tag_literal(T) -> {literal,T}. diff --git a/lib/compiler/test/beam_except_SUITE.erl b/lib/compiler/test/beam_except_SUITE.erl index da61931136..49acad2bc5 100644 --- a/lib/compiler/test/beam_except_SUITE.erl +++ b/lib/compiler/test/beam_except_SUITE.erl @@ -88,8 +88,17 @@ coverage(_) -> {'EXIT',{{strange,Self},[{?MODULE,foo,[any],[File,{line,14}]}|_]}} = (catch foo(any)), + {ok,succeed,1,2} = foobar(succeed, 1, 2), + {'EXIT',{function_clause,[{?MODULE,foobar,[[fail],1,2], + [{file,"fake.erl"},{line,16}]}|_]}} = + (catch foobar([fail], 1, 2)), + {'EXIT',{function_clause,[{?MODULE,fake_function_clause,[{a,b},42.0],_}|_]}} = + (catch fake_function_clause({a,b})), + ok. +fake_function_clause(A) -> error(function_clause, [A,42.0]). + -file("fake.erl", 1). fc(a) -> %Line 2 ok; %Line 3 @@ -104,3 +113,6 @@ bar(X) -> %Line 8 %% Cover collection code for function_clause exceptions. foo(A) -> %Line 13 error({strange,self()}, [A]). %Line 14 +%% Cover beam_except:tag_literal/1. +foobar(A, B, C) when is_atom(A) -> %Line 16 + {ok,A,B,C}. %Line 17 |