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privacy: Refactor top-level visiting in NamePrivacyVisitor #120339

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Jan 26, 2024
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privacy: Refactor top-level visiting in NamePrivacyVisitor #120339

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59 changes: 16 additions & 43 deletions compiler/rustc_privacy/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,6 @@ use rustc_hir::def::{DefKind, Res};
use rustc_hir::def_id::{DefId, LocalDefId, LocalModDefId, CRATE_DEF_ID};
use rustc_hir::intravisit::{self, Visitor};
use rustc_hir::{AssocItemKind, ForeignItemKind, ItemId, PatKind};
use rustc_middle::hir::nested_filter;
use rustc_middle::middle::privacy::{EffectiveVisibilities, EffectiveVisibility, Level};
use rustc_middle::query::Providers;
use rustc_middle::ty::GenericArgs;
Expand All @@ -36,9 +35,9 @@ use rustc_span::hygiene::Transparency;
use rustc_span::symbol::{kw, sym, Ident};
use rustc_span::Span;

use std::fmt;
use std::marker::PhantomData;
use std::ops::ControlFlow;
use std::{fmt, mem};

use errors::{
FieldIsPrivate, FieldIsPrivateLabel, FromPrivateDependencyInPublicInterface, InPublicInterface,
Expand Down Expand Up @@ -935,7 +934,6 @@ impl<'tcx, 'a> Visitor<'tcx> for TestReachabilityVisitor<'tcx, 'a> {
struct NamePrivacyVisitor<'tcx> {
tcx: TyCtxt<'tcx>,
maybe_typeck_results: Option<&'tcx ty::TypeckResults<'tcx>>,
current_item: LocalDefId,
}

impl<'tcx> NamePrivacyVisitor<'tcx> {
Expand All @@ -951,6 +949,7 @@ impl<'tcx> NamePrivacyVisitor<'tcx> {
// Checks that a field in a struct constructor (expression or pattern) is accessible.
fn check_field(
&mut self,
hir_id: hir::HirId, // ID of the field use
use_ctxt: Span, // syntax context of the field name at the use site
span: Span, // span of the field pattern, e.g., `x: 0`
def: ty::AdtDef<'tcx>, // definition of the struct or enum
Expand All @@ -963,7 +962,6 @@ impl<'tcx> NamePrivacyVisitor<'tcx> {

// definition of the field
let ident = Ident::new(kw::Empty, use_ctxt);
let hir_id = self.tcx.local_def_id_to_hir_id(self.current_item);
let def_id = self.tcx.adjust_ident_and_get_scope(ident, def.did(), hir_id).1;
if !field.vis.is_accessible_from(def_id, self.tcx) {
self.tcx.dcx().emit_err(FieldIsPrivate {
Expand All @@ -982,33 +980,13 @@ impl<'tcx> NamePrivacyVisitor<'tcx> {
}

impl<'tcx> Visitor<'tcx> for NamePrivacyVisitor<'tcx> {
type NestedFilter = nested_filter::All;

/// We want to visit items in the context of their containing
/// module and so forth, so supply a crate for doing a deep walk.
fn nested_visit_map(&mut self) -> Self::Map {
self.tcx.hir()
}

fn visit_mod(&mut self, _m: &'tcx hir::Mod<'tcx>, _s: Span, _n: hir::HirId) {
// Don't visit nested modules, since we run a separate visitor walk
// for each module in `effective_visibilities`
}

fn visit_nested_body(&mut self, body: hir::BodyId) {
fn visit_nested_body(&mut self, body_id: hir::BodyId) {
let old_maybe_typeck_results =
self.maybe_typeck_results.replace(self.tcx.typeck_body(body));
let body = self.tcx.hir().body(body);
self.visit_body(body);
self.maybe_typeck_results.replace(self.tcx.typeck_body(body_id));
self.visit_body(self.tcx.hir().body(body_id));
self.maybe_typeck_results = old_maybe_typeck_results;
}

fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
let orig_current_item = mem::replace(&mut self.current_item, item.owner_id.def_id);
intravisit::walk_item(self, item);
self.current_item = orig_current_item;
}

fn visit_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) {
if let hir::ExprKind::Struct(qpath, fields, ref base) = expr.kind {
let res = self.typeck_results().qpath_res(qpath, expr.hir_id);
Expand All @@ -1022,17 +1000,17 @@ impl<'tcx> Visitor<'tcx> for NamePrivacyVisitor<'tcx> {
let field = fields
.iter()
.find(|f| self.typeck_results().field_index(f.hir_id) == vf_index);
let (use_ctxt, span) = match field {
Some(field) => (field.ident.span, field.span),
None => (base.span, base.span),
let (hir_id, use_ctxt, span) = match field {
Some(field) => (field.hir_id, field.ident.span, field.span),
None => (base.hir_id, base.span, base.span),
};
self.check_field(use_ctxt, span, adt, variant_field, true);
self.check_field(hir_id, use_ctxt, span, adt, variant_field, true);
}
} else {
for field in fields {
let use_ctxt = field.ident.span;
let (hir_id, use_ctxt, span) = (field.hir_id, field.ident.span, field.span);
let index = self.typeck_results().field_index(field.hir_id);
self.check_field(use_ctxt, field.span, adt, &variant.fields[index], false);
self.check_field(hir_id, use_ctxt, span, adt, &variant.fields[index], false);
}
}
}
Expand All @@ -1046,9 +1024,9 @@ impl<'tcx> Visitor<'tcx> for NamePrivacyVisitor<'tcx> {
let adt = self.typeck_results().pat_ty(pat).ty_adt_def().unwrap();
let variant = adt.variant_of_res(res);
for field in fields {
let use_ctxt = field.ident.span;
let (hir_id, use_ctxt, span) = (field.hir_id, field.ident.span, field.span);
let index = self.typeck_results().field_index(field.hir_id);
self.check_field(use_ctxt, field.span, adt, &variant.fields[index], false);
self.check_field(hir_id, use_ctxt, span, adt, &variant.fields[index], false);
}
}

Expand Down Expand Up @@ -1743,17 +1721,12 @@ pub fn provide(providers: &mut Providers) {

fn check_mod_privacy(tcx: TyCtxt<'_>, module_def_id: LocalModDefId) {
// Check privacy of names not checked in previous compilation stages.
let mut visitor = NamePrivacyVisitor {
tcx,
maybe_typeck_results: None,
current_item: module_def_id.to_local_def_id(),
};
let (module, span, hir_id) = tcx.hir().get_module(module_def_id);

intravisit::walk_mod(&mut visitor, module, hir_id);
let mut visitor = NamePrivacyVisitor { tcx, maybe_typeck_results: None };
tcx.hir().visit_item_likes_in_module(module_def_id, &mut visitor);

// Check privacy of explicitly written types and traits as well as
// inferred types of expressions and patterns.
let span = tcx.def_span(module_def_id);
let mut visitor = TypePrivacyVisitor { tcx, module_def_id, maybe_typeck_results: None, span };
tcx.hir().visit_item_likes_in_module(module_def_id, &mut visitor);
}
Expand Down
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