diff options
Diffstat (limited to 'compiler/rustc_hir_analysis/src/lib.rs')
| -rw-r--r-- | compiler/rustc_hir_analysis/src/lib.rs | 285 |
1 files changed, 16 insertions, 269 deletions
diff --git a/compiler/rustc_hir_analysis/src/lib.rs b/compiler/rustc_hir_analysis/src/lib.rs index a68832d96..4f95174f8 100644 --- a/compiler/rustc_hir_analysis/src/lib.rs +++ b/compiler/rustc_hir_analysis/src/lib.rs @@ -99,23 +99,20 @@ use rustc_errors::ErrorGuaranteed; use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage}; use rustc_fluent_macro::fluent_messages; use rustc_hir as hir; -use rustc_hir::Node; use rustc_infer::infer::TyCtxtInferExt; use rustc_middle::middle; use rustc_middle::query::Providers; use rustc_middle::ty::{self, Ty, TyCtxt}; use rustc_middle::util; -use rustc_session::{config::EntryFnType, parse::feature_err}; -use rustc_span::def_id::{DefId, LocalDefId, CRATE_DEF_ID}; +use rustc_session::parse::feature_err; use rustc_span::{symbol::sym, Span, DUMMY_SP}; use rustc_target::spec::abi::Abi; use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt as _; -use rustc_trait_selection::traits::{self, ObligationCause, ObligationCauseCode, ObligationCtxt}; - -use std::ops::Not; +use rustc_trait_selection::traits::{self, ObligationCause, ObligationCtxt}; use astconv::{AstConv, OnlySelfBounds}; use bounds::Bounds; +use rustc_hir::def::DefKind; fluent_messages! { "../messages.ftl" } @@ -176,271 +173,11 @@ fn require_same_types<'tcx>( } } -fn check_main_fn_ty(tcx: TyCtxt<'_>, main_def_id: DefId) { - let main_fnsig = tcx.fn_sig(main_def_id).subst_identity(); - let main_span = tcx.def_span(main_def_id); - - fn main_fn_diagnostics_def_id(tcx: TyCtxt<'_>, def_id: DefId, sp: Span) -> LocalDefId { - if let Some(local_def_id) = def_id.as_local() { - let hir_type = tcx.type_of(local_def_id).subst_identity(); - if !matches!(hir_type.kind(), ty::FnDef(..)) { - span_bug!(sp, "main has a non-function type: found `{}`", hir_type); - } - local_def_id - } else { - CRATE_DEF_ID - } - } - - fn main_fn_generics_params_span(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Span> { - if !def_id.is_local() { - return None; - } - let hir_id = tcx.hir().local_def_id_to_hir_id(def_id.expect_local()); - match tcx.hir().find(hir_id) { - Some(Node::Item(hir::Item { kind: hir::ItemKind::Fn(_, generics, _), .. })) => { - generics.params.is_empty().not().then_some(generics.span) - } - _ => { - span_bug!(tcx.def_span(def_id), "main has a non-function type"); - } - } - } - - fn main_fn_where_clauses_span(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Span> { - if !def_id.is_local() { - return None; - } - let hir_id = tcx.hir().local_def_id_to_hir_id(def_id.expect_local()); - match tcx.hir().find(hir_id) { - Some(Node::Item(hir::Item { kind: hir::ItemKind::Fn(_, generics, _), .. })) => { - Some(generics.where_clause_span) - } - _ => { - span_bug!(tcx.def_span(def_id), "main has a non-function type"); - } - } - } - - fn main_fn_asyncness_span(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Span> { - if !def_id.is_local() { - return None; - } - Some(tcx.def_span(def_id)) - } - - fn main_fn_return_type_span(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Span> { - if !def_id.is_local() { - return None; - } - let hir_id = tcx.hir().local_def_id_to_hir_id(def_id.expect_local()); - match tcx.hir().find(hir_id) { - Some(Node::Item(hir::Item { kind: hir::ItemKind::Fn(fn_sig, _, _), .. })) => { - Some(fn_sig.decl.output.span()) - } - _ => { - span_bug!(tcx.def_span(def_id), "main has a non-function type"); - } - } - } - - let mut error = false; - let main_diagnostics_def_id = main_fn_diagnostics_def_id(tcx, main_def_id, main_span); - let main_fn_generics = tcx.generics_of(main_def_id); - let main_fn_predicates = tcx.predicates_of(main_def_id); - if main_fn_generics.count() != 0 || !main_fnsig.bound_vars().is_empty() { - let generics_param_span = main_fn_generics_params_span(tcx, main_def_id); - tcx.sess.emit_err(errors::MainFunctionGenericParameters { - span: generics_param_span.unwrap_or(main_span), - label_span: generics_param_span, - }); - error = true; - } else if !main_fn_predicates.predicates.is_empty() { - // generics may bring in implicit predicates, so we skip this check if generics is present. - let generics_where_clauses_span = main_fn_where_clauses_span(tcx, main_def_id); - tcx.sess.emit_err(errors::WhereClauseOnMain { - span: generics_where_clauses_span.unwrap_or(main_span), - generics_span: generics_where_clauses_span, - }); - error = true; - } - - let main_asyncness = tcx.asyncness(main_def_id); - if let hir::IsAsync::Async = main_asyncness { - let asyncness_span = main_fn_asyncness_span(tcx, main_def_id); - tcx.sess.emit_err(errors::MainFunctionAsync { span: main_span, asyncness: asyncness_span }); - error = true; - } - - for attr in tcx.get_attrs(main_def_id, sym::track_caller) { - tcx.sess.emit_err(errors::TrackCallerOnMain { span: attr.span, annotated: main_span }); - error = true; - } - - if !tcx.codegen_fn_attrs(main_def_id).target_features.is_empty() - // Calling functions with `#[target_feature]` is not unsafe on WASM, see #84988 - && !tcx.sess.target.is_like_wasm - && !tcx.sess.opts.actually_rustdoc - { - tcx.sess.emit_err(errors::TargetFeatureOnMain { main: main_span }); - error = true; - } - - if error { - return; - } - - // Main should have no WC, so empty param env is OK here. - let param_env = ty::ParamEnv::empty(); - let expected_return_type; - if let Some(term_did) = tcx.lang_items().termination() { - let return_ty = main_fnsig.output(); - let return_ty_span = main_fn_return_type_span(tcx, main_def_id).unwrap_or(main_span); - if !return_ty.bound_vars().is_empty() { - tcx.sess.emit_err(errors::MainFunctionReturnTypeGeneric { span: return_ty_span }); - error = true; - } - let return_ty = return_ty.skip_binder(); - let infcx = tcx.infer_ctxt().build(); - let cause = traits::ObligationCause::new( - return_ty_span, - main_diagnostics_def_id, - ObligationCauseCode::MainFunctionType, - ); - let ocx = traits::ObligationCtxt::new(&infcx); - let norm_return_ty = ocx.normalize(&cause, param_env, return_ty); - ocx.register_bound(cause, param_env, norm_return_ty, term_did); - let errors = ocx.select_all_or_error(); - if !errors.is_empty() { - infcx.err_ctxt().report_fulfillment_errors(&errors); - error = true; - } - // now we can take the return type of the given main function - expected_return_type = main_fnsig.output(); - } else { - // standard () main return type - expected_return_type = ty::Binder::dummy(Ty::new_unit(tcx)); - } - - if error { - return; - } - - let se_ty = Ty::new_fn_ptr( - tcx, - expected_return_type.map_bound(|expected_return_type| { - tcx.mk_fn_sig([], expected_return_type, false, hir::Unsafety::Normal, Abi::Rust) - }), - ); - - require_same_types( - tcx, - &ObligationCause::new( - main_span, - main_diagnostics_def_id, - ObligationCauseCode::MainFunctionType, - ), - param_env, - se_ty, - Ty::new_fn_ptr(tcx, main_fnsig), - ); -} -fn check_start_fn_ty(tcx: TyCtxt<'_>, start_def_id: DefId) { - let start_def_id = start_def_id.expect_local(); - let start_id = tcx.hir().local_def_id_to_hir_id(start_def_id); - let start_span = tcx.def_span(start_def_id); - let start_t = tcx.type_of(start_def_id).subst_identity(); - match start_t.kind() { - ty::FnDef(..) => { - if let Some(Node::Item(it)) = tcx.hir().find(start_id) { - if let hir::ItemKind::Fn(sig, generics, _) = &it.kind { - let mut error = false; - if !generics.params.is_empty() { - tcx.sess.emit_err(errors::StartFunctionParameters { span: generics.span }); - error = true; - } - if generics.has_where_clause_predicates { - tcx.sess.emit_err(errors::StartFunctionWhere { - span: generics.where_clause_span, - }); - error = true; - } - if let hir::IsAsync::Async = sig.header.asyncness { - let span = tcx.def_span(it.owner_id); - tcx.sess.emit_err(errors::StartAsync { span: span }); - error = true; - } - - let attrs = tcx.hir().attrs(start_id); - for attr in attrs { - if attr.has_name(sym::track_caller) { - tcx.sess.emit_err(errors::StartTrackCaller { - span: attr.span, - start: start_span, - }); - error = true; - } - if attr.has_name(sym::target_feature) - // Calling functions with `#[target_feature]` is - // not unsafe on WASM, see #84988 - && !tcx.sess.target.is_like_wasm - && !tcx.sess.opts.actually_rustdoc - { - tcx.sess.emit_err(errors::StartTargetFeature { - span: attr.span, - start: start_span, - }); - error = true; - } - } - - if error { - return; - } - } - } - - let se_ty = Ty::new_fn_ptr( - tcx, - ty::Binder::dummy(tcx.mk_fn_sig( - [tcx.types.isize, Ty::new_imm_ptr(tcx, Ty::new_imm_ptr(tcx, tcx.types.u8))], - tcx.types.isize, - false, - hir::Unsafety::Normal, - Abi::Rust, - )), - ); - - require_same_types( - tcx, - &ObligationCause::new( - start_span, - start_def_id, - ObligationCauseCode::StartFunctionType, - ), - ty::ParamEnv::empty(), // start should not have any where bounds. - se_ty, - Ty::new_fn_ptr(tcx, tcx.fn_sig(start_def_id).subst_identity()), - ); - } - _ => { - span_bug!(start_span, "start has a non-function type: found `{}`", start_t); - } - } -} - -fn check_for_entry_fn(tcx: TyCtxt<'_>) { - match tcx.entry_fn(()) { - Some((def_id, EntryFnType::Main { .. })) => check_main_fn_ty(tcx, def_id), - Some((def_id, EntryFnType::Start)) => check_start_fn_ty(tcx, def_id), - _ => {} - } -} - pub fn provide(providers: &mut Providers) { collect::provide(providers); coherence::provide(providers); check::provide(providers); + check_unused::provide(providers); variance::provide(providers); outlives::provide(providers); impl_wf_check::provide(providers); @@ -500,8 +237,18 @@ pub fn check_crate(tcx: TyCtxt<'_>) -> Result<(), ErrorGuaranteed> { tcx.hir().for_each_module(|module| tcx.ensure().check_mod_item_types(module)) }); - check_unused::check_crate(tcx); - check_for_entry_fn(tcx); + // FIXME: Remove this when we implement creating `DefId`s + // for anon constants during their parents' typeck. + // Typeck all body owners in parallel will produce queries + // cycle errors because it may typeck on anon constants directly. + tcx.hir().par_body_owners(|item_def_id| { + let def_kind = tcx.def_kind(item_def_id); + if !matches!(def_kind, DefKind::AnonConst) { + tcx.ensure().typeck(item_def_id); + } + }); + + tcx.ensure().check_unused_traits(()); if let Some(reported) = tcx.sess.has_errors() { Err(reported) } else { Ok(()) } } |