diff options
Diffstat (limited to 'lib/dialyzer/src/dialyzer_contracts.erl')
-rw-r--r-- | lib/dialyzer/src/dialyzer_contracts.erl | 139 |
1 files changed, 114 insertions, 25 deletions
diff --git a/lib/dialyzer/src/dialyzer_contracts.erl b/lib/dialyzer/src/dialyzer_contracts.erl index 3469d70a4d..2b78b736ab 100644 --- a/lib/dialyzer/src/dialyzer_contracts.erl +++ b/lib/dialyzer/src/dialyzer_contracts.erl @@ -2,7 +2,7 @@ %%----------------------------------------------------------------------- %% %CopyrightBegin% %% -%% Copyright Ericsson AB 2007-2010. All Rights Reserved. +%% Copyright Ericsson AB 2007-2011. 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 @@ -256,7 +256,7 @@ check_extraneous([C|Cs], SuccType) -> check_extraneous_1(Contract, SuccType) -> CRngs = erl_types:t_elements(erl_types:t_fun_range(Contract)), STRng = erl_types:t_fun_range(SuccType), - %% io:format("CR = ~p\nSR = ~p\n", [CRngs, STRng]), + ?debug("CR = ~p\nSR = ~p\n", [CRngs, STRng]), case [CR || CR <- CRngs, erl_types:t_is_none(erl_types:t_inf(CR, STRng, opaque))] of [] -> ok; CRs -> {error, {extra_range, erl_types:t_sup(CRs), STRng}} @@ -352,28 +352,37 @@ insert_constraints([], Dict) -> Dict. store_tmp_contract(MFA, FileLine, TypeSpec, SpecDict, RecordsDict) -> %% io:format("contract from form: ~p\n", [TypeSpec]), - TmpContract = contract_from_form(TypeSpec, RecordsDict), + TmpContract = contract_from_form(TypeSpec, RecordsDict, FileLine), %% io:format("contract: ~p\n", [Contract]), dict:store(MFA, {FileLine, TmpContract}, SpecDict). -contract_from_form(Forms, RecDict) -> - {CFuns, Forms1} = contract_from_form(Forms, RecDict, [], []), +contract_from_form(Forms, RecDict, FileLine) -> + {CFuns, Forms1} = contract_from_form(Forms, RecDict, FileLine, [], []), #tmp_contract{contract_funs = CFuns, forms = Forms1}. contract_from_form([{type, _, 'fun', [_, _]} = Form | Left], RecDict, - TypeAcc, FormAcc) -> + FileLine, TypeAcc, FormAcc) -> TypeFun = fun(ExpTypes, AllRecords) -> - Type = erl_types:t_from_form(Form, RecDict), + Type = + try + erl_types:t_from_form(Form, RecDict) + catch + throw:{error, Msg} -> + {File, Line} = FileLine, + NewMsg = io_lib:format("~s:~p: ~s", [filename:basename(File), + Line, Msg]), + throw({error, NewMsg}) + end, NewType = erl_types:t_solve_remote(Type, ExpTypes, AllRecords), {NewType, []} end, NewTypeAcc = [TypeFun | TypeAcc], NewFormAcc = [{Form, []} | FormAcc], - contract_from_form(Left, RecDict, NewTypeAcc, NewFormAcc); + contract_from_form(Left, RecDict, FileLine, NewTypeAcc, NewFormAcc); contract_from_form([{type, _L1, bounded_fun, [{type, _L2, 'fun', [_, _]} = Form, Constr]}| Left], - RecDict, TypeAcc, FormAcc) -> + RecDict, FileLine, TypeAcc, FormAcc) -> TypeFun = fun(ExpTypes, AllRecords) -> Constr1 = [constraint_from_form(C, RecDict, ExpTypes, AllRecords) @@ -385,8 +394,8 @@ contract_from_form([{type, _L1, bounded_fun, end, NewTypeAcc = [TypeFun | TypeAcc], NewFormAcc = [{Form, Constr} | FormAcc], - contract_from_form(Left, RecDict, NewTypeAcc, NewFormAcc); -contract_from_form([], _RecDict, TypeAcc, FormAcc) -> + contract_from_form(Left, RecDict, FileLine, NewTypeAcc, NewFormAcc); +contract_from_form([], _RecDict, _FileLine, TypeAcc, FormAcc) -> {lists:reverse(TypeAcc), lists:reverse(FormAcc)}. constraint_from_form({type, _, constraint, [{atom, _, is_subtype}, @@ -444,7 +453,21 @@ get_invalid_contract_warnings_funs([{MFA, {FileLine, Contract}}|Left], {error, invalid_contract} -> [invalid_contract_warning(MFA, FileLine, Sig, RecDict)|Acc]; {error, {extra_range, ExtraRanges, STRange}} -> - [extra_range_warning(MFA, FileLine, ExtraRanges, STRange)|Acc]; + Warn = + case t_from_forms_without_remote(Contract#contract.forms, + RecDict) of + {ok, NoRemoteType} -> + CRet = erl_types:t_fun_range(NoRemoteType), + erl_types:t_is_subtype(ExtraRanges, CRet); + unsupported -> + true + end, + case Warn of + true -> + [extra_range_warning(MFA, FileLine, ExtraRanges, STRange)|Acc]; + false -> + Acc + end; {error, Msg} -> [{?WARN_CONTRACT_SYNTAX, FileLine, Msg}|Acc]; ok -> @@ -507,26 +530,92 @@ picky_contract_check(CSig0, Sig0, MFA, FileLine, Contract, RecDict, Acc) -> extra_contract_warning({M, F, A}, FileLine, Contract, CSig, Sig, RecDict) -> SigString = lists:flatten(dialyzer_utils:format_sig(Sig, RecDict)), ContractString0 = lists:flatten(dialyzer_utils:format_sig(CSig, RecDict)), - case SigString =:= ContractString0 of + %% The only difference is in record fields containing 'undefined' or not. + IsUndefRecordFieldsRelated = SigString =:= ContractString0, + {IsRemoteTypesRelated, SubtypeRelation} = + is_remote_types_related(Contract, CSig, Sig, RecDict), + case IsUndefRecordFieldsRelated orelse IsRemoteTypesRelated of true -> - %% The only difference is in record fields containing 'undefined' or not. no_warning; false -> ContractString = contract_to_string(Contract), {Tag, Msg} = - case erl_types:t_is_subtype(CSig, Sig) of - true -> + case SubtypeRelation of + contract_is_subtype -> {?WARN_CONTRACT_SUBTYPE, {contract_subtype, [M, F, A, ContractString, SigString]}}; - false -> - case erl_types:t_is_subtype(Sig, CSig) of - true -> - {?WARN_CONTRACT_SUPERTYPE, - {contract_supertype, [M, F, A, ContractString, SigString]}}; - false -> - {?WARN_CONTRACT_NOT_EQUAL, - {contract_diff, [M, F, A, ContractString, SigString]}} - end + contract_is_supertype -> + {?WARN_CONTRACT_SUPERTYPE, + {contract_supertype, [M, F, A, ContractString, SigString]}}; + neither -> + {?WARN_CONTRACT_NOT_EQUAL, + {contract_diff, [M, F, A, ContractString, SigString]}} end, {warning, {Tag, FileLine, Msg}} end. + +is_remote_types_related(Contract, CSig, Sig, RecDict) -> + case erl_types:t_is_subtype(CSig, Sig) of + true -> + {false, contract_is_subtype}; + false -> + case erl_types:t_is_subtype(Sig, CSig) of + true -> + case t_from_forms_without_remote(Contract#contract.forms, RecDict) of + {ok, NoRemoteTypeSig} -> + case blame_remote(CSig, NoRemoteTypeSig, Sig) of + true -> + {true, neither}; + false -> + {false, contract_is_supertype} + end; + unsupported -> + {false, contract_is_supertype} + end; + false -> + {false, neither} + end + end. + +t_from_forms_without_remote([{FType, []}], RecDict) -> + Type0 = erl_types:t_from_form(FType, RecDict), + Map = + fun(Type) -> + case erl_types:t_is_remote(Type) of + true -> erl_types:t_none(); + false -> Type + end + end, + {ok, erl_types:t_map(Map, Type0)}; +t_from_forms_without_remote([{_FType, _Constrs}], _RecDict) -> + %% 'When' constraints + unsupported; +t_from_forms_without_remote(_Forms, _RecDict) -> + %% Lots of forms + unsupported. + +blame_remote(ContractSig, NoRemoteContractSig, Sig) -> + CArgs = erl_types:t_fun_args(ContractSig), + CRange = erl_types:t_fun_range(ContractSig), + NRArgs = erl_types:t_fun_args(NoRemoteContractSig), + NRRange = erl_types:t_fun_range(NoRemoteContractSig), + SArgs = erl_types:t_fun_args(Sig), + SRange = erl_types:t_fun_range(Sig), + blame_remote_list([CRange|CArgs], [NRRange|NRArgs], [SRange|SArgs]). + +blame_remote_list([], [], []) -> + true; +blame_remote_list([CArg|CArgs], [NRArg|NRArgs], [SArg|SArgs]) -> + case erl_types:t_is_equal(CArg, NRArg) of + true -> + case not erl_types:t_is_equal(CArg, SArg) of + true -> false; + false -> blame_remote_list(CArgs, NRArgs, SArgs) + end; + false -> + case erl_types:t_is_subtype(SArg, NRArg) + andalso not erl_types:t_is_subtype(NRArg, SArg) of + true -> false; + false -> blame_remote_list(CArgs, NRArgs, SArgs) + end + end. |