Merge from rustc

Author: oli-obk

Cargo.lock

@@ -5294,6 +5294,7 @@ name = "rustc_span"
 version = "0.0.0"
 dependencies = [
  "cfg-if",
+ "indexmap",
  "md-5",
  "rustc_arena",
  "rustc_data_structures",

compiler/rustc_ast/src/attr/mod.rs

@@ -180,6 +180,12 @@ impl Attribute {
         self.doc_str().map_or(false, |s| comments::may_have_doc_links(s.as_str()))
     }
 
+    pub fn is_proc_macro_attr(&self) -> bool {
+        [sym::proc_macro, sym::proc_macro_attribute, sym::proc_macro_derive]
+            .iter()
+            .any(|kind| self.has_name(*kind))
+    }
+
     /// Extracts the MetaItem from inside this Attribute.
     pub fn meta(&self) -> Option<MetaItem> {
         match &self.kind {
@@ -627,6 +633,22 @@ pub fn mk_attr_name_value_str(
     mk_attr(g, style, path, args, span)
 }
 
+pub fn filter_by_name(attrs: &[Attribute], name: Symbol) -> impl Iterator<Item = &Attribute> {
+    attrs.iter().filter(move |attr| attr.has_name(name))
+}
+
+pub fn find_by_name(attrs: &[Attribute], name: Symbol) -> Option<&Attribute> {
+    filter_by_name(attrs, name).next()
+}
+
+pub fn first_attr_value_str_by_name(attrs: &[Attribute], name: Symbol) -> Option<Symbol> {
+    find_by_name(attrs, name).and_then(|attr| attr.value_str())
+}
+
+pub fn contains_name(attrs: &[Attribute], name: Symbol) -> bool {
+    find_by_name(attrs, name).is_some()
+}
+
 pub fn list_contains_name(items: &[NestedMetaItem], name: Symbol) -> bool {
     items.iter().any(|item| item.has_name(name))
 }

compiler/rustc_ast_lowering/src/lib.rs

@@ -2185,7 +2185,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
             def_id: self.local_def_id(param.id),
             name,
             span: self.lower_span(param.span()),
-            pure_wrt_drop: self.tcx.sess.contains_name(&param.attrs, sym::may_dangle),
+            pure_wrt_drop: attr::contains_name(&param.attrs, sym::may_dangle),
             kind,
             colon_span: param.colon_span.map(|s| self.lower_span(s)),
             source,

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -799,11 +799,11 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
     }
 
     fn visit_item(&mut self, item: &'a Item) {
-        if item.attrs.iter().any(|attr| self.session.is_proc_macro_attr(attr)) {
+        if item.attrs.iter().any(|attr| attr.is_proc_macro_attr()) {
             self.has_proc_macro_decls = true;
         }
 
-        if self.session.contains_name(&item.attrs, sym::no_mangle) {
+        if attr::contains_name(&item.attrs, sym::no_mangle) {
             self.check_nomangle_item_asciionly(item.ident, item.span);
         }
 
@@ -973,7 +973,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
                 }
                 // Ensure that `path` attributes on modules are recorded as used (cf. issue #35584).
                 if !matches!(mod_kind, ModKind::Loaded(_, Inline::Yes, _))
-                    && !self.session.contains_name(&item.attrs, sym::path)
+                    && !attr::contains_name(&item.attrs, sym::path)
                 {
                     self.check_mod_file_item_asciionly(item.ident);
                 }
@@ -1248,7 +1248,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
     }
 
     fn visit_assoc_item(&mut self, item: &'a AssocItem, ctxt: AssocCtxt) {
-        if self.session.contains_name(&item.attrs, sym::no_mangle) {
+        if attr::contains_name(&item.attrs, sym::no_mangle) {
             self.check_nomangle_item_asciionly(item.ident, item.span);
         }
 

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -1,6 +1,6 @@
 use rustc_ast as ast;
 use rustc_ast::visit::{self, AssocCtxt, FnCtxt, FnKind, Visitor};
-use rustc_ast::{AssocConstraint, AssocConstraintKind, NodeId};
+use rustc_ast::{attr, AssocConstraint, AssocConstraintKind, NodeId};
 use rustc_ast::{PatKind, RangeEnd};
 use rustc_errors::{Applicability, StashKey};
 use rustc_feature::{AttributeGate, BuiltinAttribute, Features, GateIssue, BUILTIN_ATTRIBUTE_MAP};
@@ -232,7 +232,7 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
             }
 
             ast::ItemKind::Fn(..) => {
-                if self.sess.contains_name(&i.attrs, sym::start) {
+                if attr::contains_name(&i.attrs, sym::start) {
                     gate_feature_post!(
                         &self,
                         start,
@@ -245,7 +245,7 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
             }
 
             ast::ItemKind::Struct(..) => {
-                for attr in self.sess.filter_by_name(&i.attrs, sym::repr) {
+                for attr in attr::filter_by_name(&i.attrs, sym::repr) {
                     for item in attr.meta_item_list().unwrap_or_else(ThinVec::new) {
                         if item.has_name(sym::simd) {
                             gate_feature_post!(
@@ -306,7 +306,7 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
     fn visit_foreign_item(&mut self, i: &'a ast::ForeignItem) {
         match i.kind {
             ast::ForeignItemKind::Fn(..) | ast::ForeignItemKind::Static(..) => {
-                let link_name = self.sess.first_attr_value_str_by_name(&i.attrs, sym::link_name);
+                let link_name = attr::first_attr_value_str_by_name(&i.attrs, sym::link_name);
                 let links_to_llvm =
                     link_name.map_or(false, |val| val.as_str().starts_with("llvm."));
                 if links_to_llvm {

compiler/rustc_attr/src/builtin.rs

@@ -1,6 +1,6 @@
 //! Parsing and validation of builtin attributes
 
-use rustc_ast as ast;
+use rustc_ast::{self as ast, attr};
 use rustc_ast::{Attribute, LitKind, MetaItem, MetaItemKind, MetaItemLit, NestedMetaItem, NodeId};
 use rustc_ast_pretty::pprust;
 use rustc_feature::{find_gated_cfg, is_builtin_attr_name, Features, GatedCfg};
@@ -556,8 +556,8 @@ where
     (stab, const_stab, body_stab)
 }
 
-pub fn find_crate_name(sess: &Session, attrs: &[Attribute]) -> Option<Symbol> {
-    sess.first_attr_value_str_by_name(attrs, sym::crate_name)
+pub fn find_crate_name(attrs: &[Attribute]) -> Option<Symbol> {
+    attr::first_attr_value_str_by_name(attrs, sym::crate_name)
 }
 
 #[derive(Clone, Debug)]
@@ -1177,7 +1177,7 @@ fn allow_unstable<'a>(
     attrs: &'a [Attribute],
     symbol: Symbol,
 ) -> impl Iterator<Item = Symbol> + 'a {
-    let attrs = sess.filter_by_name(attrs, symbol);
+    let attrs = attr::filter_by_name(attrs, symbol);
     let list = attrs
         .filter_map(move |attr| {
             attr.meta_item_list().or_else(|| {

compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs

@@ -120,9 +120,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                     && !self.upvars.is_empty()
                 {
                     item_msg = access_place_desc;
-                    debug_assert!(
-                        self.body.local_decls[ty::CAPTURE_STRUCT_LOCAL].ty.is_region_ptr()
-                    );
+                    debug_assert!(self.body.local_decls[ty::CAPTURE_STRUCT_LOCAL].ty.is_ref());
                     debug_assert!(is_closure_or_generator(
                         Place::ty_from(
                             the_place_err.local,
@@ -470,11 +468,8 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
             {
                 let local_decl = &self.body.local_decls[local];
 
-                let (pointer_sigil, pointer_desc) = if local_decl.ty.is_region_ptr() {
-                    ("&", "reference")
-                } else {
-                    ("*const", "pointer")
-                };
+                let (pointer_sigil, pointer_desc) =
+                    if local_decl.ty.is_ref() { ("&", "reference") } else { ("*const", "pointer") };
 
                 match self.local_names[local] {
                     Some(name) if !local_decl.from_compiler_desugaring() => {
@@ -1258,7 +1253,7 @@ fn suggest_ampmut<'tcx>(
     (
         suggestability,
         highlight_span,
-        if local_decl.ty.is_region_ptr() {
+        if local_decl.ty.is_ref() {
             format!("&mut {}", ty_mut.ty)
         } else {
             format!("*mut {}", ty_mut.ty)

compiler/rustc_borrowck/src/lib.rs

@@ -19,7 +19,6 @@ extern crate tracing;
 
 use rustc_data_structures::fx::{FxIndexMap, FxIndexSet};
 use rustc_data_structures::graph::dominators::Dominators;
-use rustc_data_structures::vec_map::VecMap;
 use rustc_errors::{Diagnostic, DiagnosticBuilder, DiagnosticMessage, SubdiagnosticMessage};
 use rustc_hir as hir;
 use rustc_hir::def_id::LocalDefId;
@@ -141,7 +140,7 @@ fn mir_borrowck(tcx: TyCtxt<'_>, def: ty::WithOptConstParam<LocalDefId>) -> &Bor
         debug!("Skipping borrowck because of injected body");
         // Let's make up a borrowck result! Fun times!
         let result = BorrowCheckResult {
-            concrete_opaque_types: VecMap::new(),
+            concrete_opaque_types: FxIndexMap::default(),
             closure_requirements: None,
             used_mut_upvars: SmallVec::new(),
             tainted_by_errors: None,
@@ -511,16 +510,11 @@ impl<'cx, 'tcx> BorrowckInferCtxt<'cx, 'tcx> {
             .as_var()
             .unwrap_or_else(|| bug!("expected RegionKind::RegionVar on {:?}", next_region));
 
-        if cfg!(debug_assertions) {
+        if cfg!(debug_assertions) && !self.inside_canonicalization_ctxt() {
             debug!("inserting vid {:?} with origin {:?} into var_to_origin", vid, origin);
             let ctxt = get_ctxt_fn();
             let mut var_to_origin = self.reg_var_to_origin.borrow_mut();
-            let prev = var_to_origin.insert(vid, ctxt);
-
-            // This only makes sense if not called in a canonicalization context. If this
-            // ever changes we either want to get rid of `BorrowckInferContext::reg_var_to_origin`
-            // or modify how we track nll region vars for that map.
-            assert!(matches!(prev, None));
+            var_to_origin.insert(vid, ctxt);
         }
 
         next_region
@@ -540,16 +534,11 @@ impl<'cx, 'tcx> BorrowckInferCtxt<'cx, 'tcx> {
             .as_var()
             .unwrap_or_else(|| bug!("expected RegionKind::RegionVar on {:?}", next_region));
 
-        if cfg!(debug_assertions) {
+        if cfg!(debug_assertions) && !self.inside_canonicalization_ctxt() {
             debug!("inserting vid {:?} with origin {:?} into var_to_origin", vid, origin);
             let ctxt = get_ctxt_fn();
             let mut var_to_origin = self.reg_var_to_origin.borrow_mut();
-            let prev = var_to_origin.insert(vid, ctxt);
-
-            // This only makes sense if not called in a canonicalization context. If this
-            // ever changes we either want to get rid of `BorrowckInferContext::reg_var_to_origin`
-            // or modify how we track nll region vars for that map.
-            assert!(matches!(prev, None));
+            var_to_origin.insert(vid, ctxt);
         }
 
         next_region

compiler/rustc_borrowck/src/nll.rs

@@ -2,7 +2,7 @@
 #![deny(rustc::diagnostic_outside_of_impl)]
 //! The entry point of the NLL borrow checker.
 
-use rustc_data_structures::vec_map::VecMap;
+use rustc_data_structures::fx::FxIndexMap;
 use rustc_hir::def_id::LocalDefId;
 use rustc_index::vec::IndexVec;
 use rustc_middle::mir::{create_dump_file, dump_enabled, dump_mir, PassWhere};
@@ -44,7 +44,7 @@ pub type PoloniusOutput = Output<RustcFacts>;
 /// closure requirements to propagate, and any generated errors.
 pub(crate) struct NllOutput<'tcx> {
     pub regioncx: RegionInferenceContext<'tcx>,
-    pub opaque_type_values: VecMap<LocalDefId, OpaqueHiddenType<'tcx>>,
+    pub opaque_type_values: FxIndexMap<LocalDefId, OpaqueHiddenType<'tcx>>,
     pub polonius_input: Option<Box<AllFacts>>,
     pub polonius_output: Option<Rc<PoloniusOutput>>,
     pub opt_closure_req: Option<ClosureRegionRequirements<'tcx>>,
@@ -377,7 +377,7 @@ pub(super) fn dump_annotation<'tcx>(
     body: &Body<'tcx>,
     regioncx: &RegionInferenceContext<'tcx>,
     closure_region_requirements: &Option<ClosureRegionRequirements<'tcx>>,
-    opaque_type_values: &VecMap<LocalDefId, OpaqueHiddenType<'tcx>>,
+    opaque_type_values: &FxIndexMap<LocalDefId, OpaqueHiddenType<'tcx>>,
     errors: &mut crate::error::BorrowckErrors<'tcx>,
 ) {
     let tcx = infcx.tcx;

compiler/rustc_borrowck/src/region_infer/mod.rs

@@ -256,11 +256,12 @@ fn sccs_info<'cx, 'tcx>(
 
     let mut var_to_origin_sorted = var_to_origin.clone().into_iter().collect::<Vec<_>>();
     var_to_origin_sorted.sort_by_key(|vto| vto.0);
-    let mut debug_str = "region variables to origins:\n".to_string();
+
+    let mut reg_vars_to_origins_str = "region variables to origins:\n".to_string();
     for (reg_var, origin) in var_to_origin_sorted.into_iter() {
-        debug_str.push_str(&format!("{:?}: {:?}\n", reg_var, origin));
+        reg_vars_to_origins_str.push_str(&format!("{:?}: {:?}\n", reg_var, origin));
     }
-    debug!(debug_str);
+    debug!("{}", reg_vars_to_origins_str);
 
     let num_components = sccs.scc_data().ranges().len();
     let mut components = vec![FxIndexSet::default(); num_components];
@@ -275,12 +276,12 @@ fn sccs_info<'cx, 'tcx>(
     for (scc_idx, reg_vars_origins) in components.iter().enumerate() {
         let regions_info = reg_vars_origins.clone().into_iter().collect::<Vec<_>>();
         components_str.push_str(&format!(
-            "{:?}: {:?})",
+            "{:?}: {:?},\n)",
             ConstraintSccIndex::from_usize(scc_idx),
             regions_info,
         ))
     }
-    debug!(components_str);
+    debug!("{}", components_str);
 
     // calculate the best representative for each component
     let components_representatives = components