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Rollup merge of rust-lang#68153 - petrochenkov:privdiag, r=estebank
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resolve: Point at the private item definitions in privacy errors

A basic version of rust-lang#67951.
r? @estebank
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@Dylan-DPC
Dylan-DPC authored Jan 17, 2020
2 parents 9f4b328 + 0b60f1f commit ecf42a3
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Showing 57 changed files with 1,223 additions and 319 deletions.
162 changes: 160 additions & 2 deletions src/librustc_resolve/diagnostics.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ use rustc_data_structures::fx::FxHashSet;
use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder};
use rustc_feature::BUILTIN_ATTRIBUTES;
use rustc_hir::def::Namespace::{self, *};
use rustc_hir::def::{self, DefKind, NonMacroAttrKind};
use rustc_hir::def::{self, CtorKind, CtorOf, DefKind, NonMacroAttrKind};
use rustc_hir::def_id::{DefId, CRATE_DEF_INDEX, LOCAL_CRATE};
use rustc_span::hygiene::MacroKind;
use rustc_span::source_map::SourceMap;
Expand All @@ -20,8 +20,9 @@ use syntax::util::lev_distance::find_best_match_for_name;

use crate::imports::{ImportDirective, ImportDirectiveSubclass, ImportResolver};
use crate::path_names_to_string;
use crate::VisResolutionError;
use crate::{AmbiguityError, AmbiguityErrorMisc, AmbiguityKind};
use crate::{BindingError, CrateLint, HasGenericParams, LegacyScope, Module, ModuleOrUniformRoot};
use crate::{NameBinding, NameBindingKind, PrivacyError, VisResolutionError};
use crate::{ParentScope, PathResult, ResolutionError, Resolver, Scope, ScopeSet, Segment};

use rustc_error_codes::*;
Expand Down Expand Up @@ -802,6 +803,163 @@ impl<'a> Resolver<'a> {
}
false
}

fn binding_description(&self, b: &NameBinding<'_>, ident: Ident, from_prelude: bool) -> String {
let res = b.res();
if b.span.is_dummy() {
let add_built_in = match b.res() {
// These already contain the "built-in" prefix or look bad with it.
Res::NonMacroAttr(..) | Res::PrimTy(..) | Res::ToolMod => false,
_ => true,
};
let (built_in, from) = if from_prelude {
("", " from prelude")
} else if b.is_extern_crate()
&& !b.is_import()
&& self.session.opts.externs.get(&ident.as_str()).is_some()
{
("", " passed with `--extern`")
} else if add_built_in {
(" built-in", "")
} else {
("", "")
};

let article = if built_in.is_empty() { res.article() } else { "a" };
format!(
"{a}{built_in} {thing}{from}",
a = article,
thing = res.descr(),
built_in = built_in,
from = from
)
} else {
let introduced = if b.is_import() { "imported" } else { "defined" };
format!("the {thing} {introduced} here", thing = res.descr(), introduced = introduced)
}
}

crate fn report_ambiguity_error(&self, ambiguity_error: &AmbiguityError<'_>) {
let AmbiguityError { kind, ident, b1, b2, misc1, misc2 } = *ambiguity_error;
let (b1, b2, misc1, misc2, swapped) = if b2.span.is_dummy() && !b1.span.is_dummy() {
// We have to print the span-less alternative first, otherwise formatting looks bad.
(b2, b1, misc2, misc1, true)
} else {
(b1, b2, misc1, misc2, false)
};

let mut err = struct_span_err!(
self.session,
ident.span,
E0659,
"`{ident}` is ambiguous ({why})",
ident = ident,
why = kind.descr()
);
err.span_label(ident.span, "ambiguous name");

let mut could_refer_to = |b: &NameBinding<'_>, misc: AmbiguityErrorMisc, also: &str| {
let what = self.binding_description(b, ident, misc == AmbiguityErrorMisc::FromPrelude);
let note_msg = format!(
"`{ident}` could{also} refer to {what}",
ident = ident,
also = also,
what = what
);

let thing = b.res().descr();
let mut help_msgs = Vec::new();
if b.is_glob_import()
&& (kind == AmbiguityKind::GlobVsGlob
|| kind == AmbiguityKind::GlobVsExpanded
|| kind == AmbiguityKind::GlobVsOuter && swapped != also.is_empty())
{
help_msgs.push(format!(
"consider adding an explicit import of \
`{ident}` to disambiguate",
ident = ident
))
}
if b.is_extern_crate() && ident.span.rust_2018() {
help_msgs.push(format!(
"use `::{ident}` to refer to this {thing} unambiguously",
ident = ident,
thing = thing,
))
}
if misc == AmbiguityErrorMisc::SuggestCrate {
help_msgs.push(format!(
"use `crate::{ident}` to refer to this {thing} unambiguously",
ident = ident,
thing = thing,
))
} else if misc == AmbiguityErrorMisc::SuggestSelf {
help_msgs.push(format!(
"use `self::{ident}` to refer to this {thing} unambiguously",
ident = ident,
thing = thing,
))
}

err.span_note(b.span, &note_msg);
for (i, help_msg) in help_msgs.iter().enumerate() {
let or = if i == 0 { "" } else { "or " };
err.help(&format!("{}{}", or, help_msg));
}
};

could_refer_to(b1, misc1, "");
could_refer_to(b2, misc2, " also");
err.emit();
}

crate fn report_privacy_error(&self, privacy_error: &PrivacyError<'_>) {
let PrivacyError { ident, binding, .. } = *privacy_error;
let session = &self.session;
let mk_struct_span_error = |is_constructor| {
let mut descr = binding.res().descr().to_string();
if is_constructor {
descr += " constructor";
}
if binding.is_import() {
descr += " import";
}

let mut err =
struct_span_err!(session, ident.span, E0603, "{} `{}` is private", descr, ident);

err.span_label(ident.span, &format!("this {} is private", descr));
err.span_note(
session.source_map().def_span(binding.span),
&format!("the {} `{}` is defined here", descr, ident),
);

err
};

let mut err = if let NameBindingKind::Res(
Res::Def(DefKind::Ctor(CtorOf::Struct, CtorKind::Fn), ctor_def_id),
_,
) = binding.kind
{
let def_id = (&*self).parent(ctor_def_id).expect("no parent for a constructor");
if let Some(fields) = self.field_names.get(&def_id) {
let mut err = mk_struct_span_error(true);
let first_field = fields.first().expect("empty field list in the map");
err.span_label(
fields.iter().fold(first_field.span, |acc, field| acc.to(field.span)),
"a constructor is private if any of the fields is private",
);
err
} else {
mk_struct_span_error(false)
}
} else {
mk_struct_span_error(false)
};

err.emit();
}
}

impl<'a, 'b> ImportResolver<'a, 'b> {
Expand Down
6 changes: 5 additions & 1 deletion src/librustc_resolve/imports.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -319,7 +319,11 @@ impl<'a> Resolver<'a> {
// Remove this together with `PUB_USE_OF_PRIVATE_EXTERN_CRATE`
!(self.last_import_segment && binding.is_extern_crate())
{
self.privacy_errors.push(PrivacyError(path_span, ident, binding));
self.privacy_errors.push(PrivacyError {
ident,
binding,
dedup_span: path_span,
});
}

Ok(binding)
Expand Down
162 changes: 10 additions & 152 deletions src/librustc_resolve/lib.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2,12 +2,9 @@
//!
//! Module structure of the crate is built here.
//! Paths in macros, imports, expressions, types, patterns are resolved here.
//! Label names are resolved here as well.
//! Label and lifetime names are resolved here as well.
//!
//! Type-relative name resolution (methods, fields, associated items) happens in `librustc_typeck`.
//! Lifetime names are resolved in `librustc/middle/resolve_lifetime.rs`.
// ignore-tidy-filelength
#![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
#![feature(bool_to_option)]
Expand All @@ -33,7 +30,7 @@ use rustc_data_structures::sync::Lrc;
use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder};
use rustc_expand::base::SyntaxExtension;
use rustc_hir::def::Namespace::*;
use rustc_hir::def::{self, CtorKind, CtorOf, DefKind, NonMacroAttrKind, PartialRes};
use rustc_hir::def::{self, CtorOf, DefKind, NonMacroAttrKind, PartialRes};
use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, CRATE_DEF_INDEX, LOCAL_CRATE};
use rustc_hir::PrimTy::{self, Bool, Char, Float, Int, Str, Uint};
use rustc_hir::{GlobMap, TraitMap};
Expand Down Expand Up @@ -604,7 +601,11 @@ impl<'a> NameBindingKind<'a> {
}
}

struct PrivacyError<'a>(Span, Ident, &'a NameBinding<'a>);
struct PrivacyError<'a> {
ident: Ident,
binding: &'a NameBinding<'a>,
dedup_span: Span,
}

struct UseError<'a> {
err: DiagnosticBuilder<'a>,
Expand Down Expand Up @@ -2446,115 +2447,6 @@ impl<'a> Resolver<'a> {
}
}

fn binding_description(&self, b: &NameBinding<'_>, ident: Ident, from_prelude: bool) -> String {
let res = b.res();
if b.span.is_dummy() {
let add_built_in = match b.res() {
// These already contain the "built-in" prefix or look bad with it.
Res::NonMacroAttr(..) | Res::PrimTy(..) | Res::ToolMod => false,
_ => true,
};
let (built_in, from) = if from_prelude {
("", " from prelude")
} else if b.is_extern_crate()
&& !b.is_import()
&& self.session.opts.externs.get(&ident.as_str()).is_some()
{
("", " passed with `--extern`")
} else if add_built_in {
(" built-in", "")
} else {
("", "")
};

let article = if built_in.is_empty() { res.article() } else { "a" };
format!(
"{a}{built_in} {thing}{from}",
a = article,
thing = res.descr(),
built_in = built_in,
from = from
)
} else {
let introduced = if b.is_import() { "imported" } else { "defined" };
format!("the {thing} {introduced} here", thing = res.descr(), introduced = introduced)
}
}

fn report_ambiguity_error(&self, ambiguity_error: &AmbiguityError<'_>) {
let AmbiguityError { kind, ident, b1, b2, misc1, misc2 } = *ambiguity_error;
let (b1, b2, misc1, misc2, swapped) = if b2.span.is_dummy() && !b1.span.is_dummy() {
// We have to print the span-less alternative first, otherwise formatting looks bad.
(b2, b1, misc2, misc1, true)
} else {
(b1, b2, misc1, misc2, false)
};

let mut err = struct_span_err!(
self.session,
ident.span,
E0659,
"`{ident}` is ambiguous ({why})",
ident = ident,
why = kind.descr()
);
err.span_label(ident.span, "ambiguous name");

let mut could_refer_to = |b: &NameBinding<'_>, misc: AmbiguityErrorMisc, also: &str| {
let what = self.binding_description(b, ident, misc == AmbiguityErrorMisc::FromPrelude);
let note_msg = format!(
"`{ident}` could{also} refer to {what}",
ident = ident,
also = also,
what = what
);

let thing = b.res().descr();
let mut help_msgs = Vec::new();
if b.is_glob_import()
&& (kind == AmbiguityKind::GlobVsGlob
|| kind == AmbiguityKind::GlobVsExpanded
|| kind == AmbiguityKind::GlobVsOuter && swapped != also.is_empty())
{
help_msgs.push(format!(
"consider adding an explicit import of \
`{ident}` to disambiguate",
ident = ident
))
}
if b.is_extern_crate() && ident.span.rust_2018() {
help_msgs.push(format!(
"use `::{ident}` to refer to this {thing} unambiguously",
ident = ident,
thing = thing,
))
}
if misc == AmbiguityErrorMisc::SuggestCrate {
help_msgs.push(format!(
"use `crate::{ident}` to refer to this {thing} unambiguously",
ident = ident,
thing = thing,
))
} else if misc == AmbiguityErrorMisc::SuggestSelf {
help_msgs.push(format!(
"use `self::{ident}` to refer to this {thing} unambiguously",
ident = ident,
thing = thing,
))
}

err.span_note(b.span, &note_msg);
for (i, help_msg) in help_msgs.iter().enumerate() {
let or = if i == 0 { "" } else { "or " };
err.help(&format!("{}{}", or, help_msg));
}
};

could_refer_to(b1, misc1, "");
could_refer_to(b2, misc2, " also");
err.emit();
}

fn report_errors(&mut self, krate: &Crate) {
self.report_with_use_injections(krate);

Expand All @@ -2575,43 +2467,9 @@ impl<'a> Resolver<'a> {
}

let mut reported_spans = FxHashSet::default();
for &PrivacyError(dedup_span, ident, binding) in &self.privacy_errors {
if reported_spans.insert(dedup_span) {
let session = &self.session;
let mk_struct_span_error = |is_constructor| {
struct_span_err!(
session,
ident.span,
E0603,
"{}{} `{}` is private",
binding.res().descr(),
if is_constructor { " constructor" } else { "" },
ident.name,
)
};

let mut err = if let NameBindingKind::Res(
Res::Def(DefKind::Ctor(CtorOf::Struct, CtorKind::Fn), ctor_def_id),
_,
) = binding.kind
{
let def_id = (&*self).parent(ctor_def_id).expect("no parent for a constructor");
if let Some(fields) = self.field_names.get(&def_id) {
let mut err = mk_struct_span_error(true);
let first_field = fields.first().expect("empty field list in the map");
err.span_label(
fields.iter().fold(first_field.span, |acc, field| acc.to(field.span)),
"a constructor is private if any of the fields is private",
);
err
} else {
mk_struct_span_error(false)
}
} else {
mk_struct_span_error(false)
};

err.emit();
for error in &self.privacy_errors {
if reported_spans.insert(error.dedup_span) {
self.report_privacy_error(error);
}
}
}
Expand Down
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