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Revert "Auto merge of rust-lang#108944 - cjgillot:clear-local-info, r…
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…=oli-obk"

This reverts commit 511364e, reversing
changes made to e386217.
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@ryoqun
ryoqun committed May 26, 2023
1 parent 44c2db1 commit 5edbb60
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Showing 30 changed files with 214 additions and 188 deletions.
29 changes: 14 additions & 15 deletions compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1985,18 +1985,16 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
let (place_desc, note) = if let Some(place_desc) = opt_place_desc {
let local_kind = if let Some(local) = borrow.borrowed_place.as_local() {
match self.body.local_kind(local) {
LocalKind::Temp if self.body.local_decls[local].is_user_variable() => {
"local variable "
LocalKind::ReturnPointer | LocalKind::Temp => {
bug!("temporary or return pointer with a name")
}
LocalKind::Var => "local variable ",
LocalKind::Arg
if !self.upvars.is_empty() && local == ty::CAPTURE_STRUCT_LOCAL =>
{
"variable captured by `move` "
}
LocalKind::Arg => "function parameter ",
LocalKind::ReturnPointer | LocalKind::Temp => {
bug!("temporary or return pointer with a name")
}
}
} else {
"local data "
Expand All @@ -2010,16 +2008,16 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
self.prefixes(borrow.borrowed_place.as_ref(), PrefixSet::All).last().unwrap();
let local = root_place.local;
match self.body.local_kind(local) {
LocalKind::ReturnPointer | LocalKind::Temp => {
("temporary value".to_string(), "temporary value created here".to_string())
}
LocalKind::Arg => (
"function parameter".to_string(),
"function parameter borrowed here".to_string(),
),
LocalKind::Temp if self.body.local_decls[local].is_user_variable() => {
LocalKind::Var => {
("local binding".to_string(), "local binding introduced here".to_string())
}
LocalKind::ReturnPointer | LocalKind::Temp => {
("temporary value".to_string(), "temporary value created here".to_string())
}
}
};

Expand Down Expand Up @@ -2484,14 +2482,15 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
let (place_description, assigned_span) = match local_decl {
Some(LocalDecl {
local_info:
ClearCrossCrate::Set(
box LocalInfo::User(BindingForm::Var(VarBindingForm {
Some(box LocalInfo::User(
ClearCrossCrate::Clear
| ClearCrossCrate::Set(BindingForm::Var(VarBindingForm {
opt_match_place: None,
..
}))
| box LocalInfo::StaticRef { .. }
| box LocalInfo::Boring,
),
})),
))
| Some(box LocalInfo::StaticRef { .. })
| None,
..
})
| None => (self.describe_any_place(place.as_ref()), assigned_span),
Expand Down
6 changes: 3 additions & 3 deletions compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,8 +6,8 @@ use rustc_hir::intravisit::Visitor;
use rustc_index::vec::IndexVec;
use rustc_infer::infer::NllRegionVariableOrigin;
use rustc_middle::mir::{
Body, CastKind, ConstraintCategory, FakeReadCause, Local, LocalInfo, Location, Operand, Place,
Rvalue, Statement, StatementKind, TerminatorKind,
Body, CastKind, ConstraintCategory, FakeReadCause, Local, Location, Operand, Place, Rvalue,
Statement, StatementKind, TerminatorKind,
};
use rustc_middle::ty::adjustment::PointerCast;
use rustc_middle::ty::{self, RegionVid, TyCtxt};
Expand Down Expand Up @@ -220,7 +220,7 @@ impl<'tcx> BorrowExplanation<'tcx> {
);
err.span_label(body.source_info(drop_loc).span, message);

if let LocalInfo::BlockTailTemp(info) = local_decl.local_info() {
if let Some(info) = &local_decl.is_block_tail {
if info.tail_result_is_ignored {
// #85581: If the first mutable borrow's scope contains
// the second borrow, this suggestion isn't helpful.
Expand Down
6 changes: 3 additions & 3 deletions compiler/rustc_borrowck/src/diagnostics/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -196,10 +196,10 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
if self.body.local_decls[local].is_ref_for_guard() {
continue;
}
if let LocalInfo::StaticRef { def_id, .. } =
*self.body.local_decls[local].local_info()
if let Some(box LocalInfo::StaticRef { def_id, .. }) =
&self.body.local_decls[local].local_info
{
buf.push_str(self.infcx.tcx.item_name(def_id).as_str());
buf.push_str(self.infcx.tcx.item_name(*def_id).as_str());
ok = Ok(());
continue;
}
Expand Down
19 changes: 11 additions & 8 deletions compiler/rustc_borrowck/src/diagnostics/move_errors.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -102,12 +102,14 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
//
// opt_match_place is None for let [mut] x = ... statements,
// whether or not the right-hand side is a place expression
if let LocalInfo::User(BindingForm::Var(VarBindingForm {
opt_match_place: Some((opt_match_place, match_span)),
binding_mode: _,
opt_ty_info: _,
pat_span: _,
})) = *local_decl.local_info()
if let Some(box LocalInfo::User(ClearCrossCrate::Set(BindingForm::Var(
VarBindingForm {
opt_match_place: Some((opt_match_place, match_span)),
binding_mode: _,
opt_ty_info: _,
pat_span: _,
},
)))) = local_decl.local_info
{
let stmt_source_info = self.body.source_info(location);
self.append_binding_error(
Expand Down Expand Up @@ -476,8 +478,9 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
let mut suggestions: Vec<(Span, String, String)> = Vec::new();
for local in binds_to {
let bind_to = &self.body.local_decls[*local];
if let LocalInfo::User(BindingForm::Var(VarBindingForm { pat_span, .. })) =
*bind_to.local_info()
if let Some(box LocalInfo::User(ClearCrossCrate::Set(BindingForm::Var(
VarBindingForm { pat_span, .. },
)))) = bind_to.local_info
{
let Ok(pat_snippet) =
self.infcx.tcx.sess.source_map().span_to_snippet(pat_span) else { continue; };
Expand Down
92 changes: 54 additions & 38 deletions compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@ use rustc_middle::mir::{Mutability, Place, PlaceRef, ProjectionElem};
use rustc_middle::ty::{self, Ty, TyCtxt};
use rustc_middle::{
hir::place::PlaceBase,
mir::{self, BindingForm, Local, LocalDecl, LocalInfo, LocalKind, Location},
mir::{self, BindingForm, ClearCrossCrate, Local, LocalDecl, LocalInfo, LocalKind, Location},
};
use rustc_span::source_map::DesugaringKind;
use rustc_span::symbol::{kw, Symbol};
Expand Down Expand Up @@ -105,8 +105,8 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
reason = String::new();
} else {
item_msg = access_place_desc;
let local_info = self.body.local_decls[local].local_info();
if let LocalInfo::StaticRef { def_id, .. } = *local_info {
let local_info = &self.body.local_decls[local].local_info;
if let Some(box LocalInfo::StaticRef { def_id, .. }) = *local_info {
let static_name = &self.infcx.tcx.item_name(def_id);
reason = format!(", as `{static_name}` is an immutable static item");
} else {
Expand Down Expand Up @@ -305,13 +305,15 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
..
}) = &self.body[location.block].statements.get(location.statement_index)
{
match *decl.local_info() {
LocalInfo::User(BindingForm::Var(mir::VarBindingForm {
binding_mode: ty::BindingMode::BindByValue(Mutability::Not),
opt_ty_info: Some(sp),
opt_match_place: _,
pat_span: _,
})) => {
match decl.local_info {
Some(box LocalInfo::User(ClearCrossCrate::Set(BindingForm::Var(
mir::VarBindingForm {
binding_mode: ty::BindingMode::BindByValue(Mutability::Not),
opt_ty_info: Some(sp),
opt_match_place: _,
pat_span: _,
},
)))) => {
if suggest {
err.span_note(sp, "the binding is already a mutable borrow");
}
Expand Down Expand Up @@ -344,8 +346,10 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
}
} else if decl.mutability.is_not() {
if matches!(
decl.local_info(),
LocalInfo::User(BindingForm::ImplicitSelf(hir::ImplicitSelfKind::MutRef))
decl.local_info,
Some(box LocalInfo::User(ClearCrossCrate::Set(BindingForm::ImplicitSelf(
hir::ImplicitSelfKind::MutRef
),)))
) {
err.note(
"as `Self` may be unsized, this call attempts to take `&mut &mut self`",
Expand Down Expand Up @@ -478,18 +482,22 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {

match self.local_names[local] {
Some(name) if !local_decl.from_compiler_desugaring() => {
let label = match *local_decl.local_info() {
LocalInfo::User(mir::BindingForm::ImplicitSelf(_)) => {
let label = match local_decl.local_info.as_deref().unwrap() {
LocalInfo::User(ClearCrossCrate::Set(
mir::BindingForm::ImplicitSelf(_),
)) => {
let (span, suggestion) =
suggest_ampmut_self(self.infcx.tcx, local_decl);
Some((true, span, suggestion))
}

LocalInfo::User(mir::BindingForm::Var(mir::VarBindingForm {
binding_mode: ty::BindingMode::BindByValue(_),
opt_ty_info,
..
})) => {
LocalInfo::User(ClearCrossCrate::Set(mir::BindingForm::Var(
mir::VarBindingForm {
binding_mode: ty::BindingMode::BindByValue(_),
opt_ty_info,
..
},
))) => {
// check if the RHS is from desugaring
let opt_assignment_rhs_span =
self.body.find_assignments(local).first().map(|&location| {
Expand Down Expand Up @@ -526,15 +534,16 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
self.infcx.tcx,
local_decl,
opt_assignment_rhs_span,
opt_ty_info,
*opt_ty_info,
)
} else {
match local_decl.local_info() {
LocalInfo::User(mir::BindingForm::Var(
mir::VarBindingForm {
opt_ty_info: None, ..
},
)) => {
match local_decl.local_info.as_deref() {
Some(LocalInfo::User(ClearCrossCrate::Set(
mir::BindingForm::Var(mir::VarBindingForm {
opt_ty_info: None,
..
}),
))) => {
let (span, sugg) = suggest_ampmut_self(
self.infcx.tcx,
local_decl,
Expand All @@ -546,7 +555,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
self.infcx.tcx,
local_decl,
opt_assignment_rhs_span,
opt_ty_info,
*opt_ty_info,
),
}
};
Expand All @@ -555,15 +564,21 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
}
}

LocalInfo::User(mir::BindingForm::Var(mir::VarBindingForm {
binding_mode: ty::BindingMode::BindByReference(_),
..
})) => {
LocalInfo::User(ClearCrossCrate::Set(mir::BindingForm::Var(
mir::VarBindingForm {
binding_mode: ty::BindingMode::BindByReference(_),
..
},
))) => {
let pattern_span = local_decl.source_info.span;
suggest_ref_mut(self.infcx.tcx, pattern_span)
.map(|replacement| (true, pattern_span, replacement))
}

LocalInfo::User(ClearCrossCrate::Clear) => {
bug!("saw cleared local state")
}

_ => unreachable!(),
};

Expand Down Expand Up @@ -1136,19 +1151,20 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
pub fn mut_borrow_of_mutable_ref(local_decl: &LocalDecl<'_>, local_name: Option<Symbol>) -> bool {
debug!("local_info: {:?}, ty.kind(): {:?}", local_decl.local_info, local_decl.ty.kind());

match *local_decl.local_info() {
match local_decl.local_info.as_deref() {
// Check if mutably borrowing a mutable reference.
LocalInfo::User(mir::BindingForm::Var(mir::VarBindingForm {
binding_mode: ty::BindingMode::BindByValue(Mutability::Not),
..
})) => matches!(local_decl.ty.kind(), ty::Ref(_, _, hir::Mutability::Mut)),
LocalInfo::User(mir::BindingForm::ImplicitSelf(kind)) => {
Some(LocalInfo::User(ClearCrossCrate::Set(mir::BindingForm::Var(
mir::VarBindingForm {
binding_mode: ty::BindingMode::BindByValue(Mutability::Not), ..
},
)))) => matches!(local_decl.ty.kind(), ty::Ref(_, _, hir::Mutability::Mut)),
Some(LocalInfo::User(ClearCrossCrate::Set(mir::BindingForm::ImplicitSelf(kind)))) => {
// Check if the user variable is a `&mut self` and we can therefore
// suggest removing the `&mut`.
//
// Deliberately fall into this case for all implicit self types,
// so that we don't fall in to the next case with them.
kind == hir::ImplicitSelfKind::MutRef
*kind == hir::ImplicitSelfKind::MutRef
}
_ if Some(kw::SelfLower) == local_name => {
// Otherwise, check if the name is the `self` keyword - in which case
Expand Down
7 changes: 5 additions & 2 deletions compiler/rustc_borrowck/src/type_check/mod.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1180,7 +1180,10 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
}
}
Some(l)
if matches!(body.local_decls[l].local_info(), LocalInfo::AggregateTemp) =>
if matches!(
body.local_decls[l].local_info,
Some(box LocalInfo::AggregateTemp)
) =>
{
ConstraintCategory::Usage
}
Expand Down Expand Up @@ -1681,7 +1684,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
// - maybe we should make that a warning.
return;
}
LocalKind::Temp => {}
LocalKind::Var | LocalKind::Temp => {}
}

// When `unsized_fn_params` or `unsized_locals` is enabled, only function calls
Expand Down
9 changes: 7 additions & 2 deletions compiler/rustc_codegen_ssa/src/mir/debuginfo.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -241,6 +241,12 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
pub fn debug_introduce_local(&self, bx: &mut Bx, local: mir::Local) {
let full_debug_info = bx.sess().opts.debuginfo == DebugInfo::Full;

// FIXME(eddyb) maybe name the return place as `_0` or `return`?
if local == mir::RETURN_PLACE && !self.mir.local_decls[mir::RETURN_PLACE].is_user_variable()
{
return;
}

let vars = match &self.per_local_var_debug_info {
Some(per_local) => &per_local[local],
None => return,
Expand Down Expand Up @@ -297,8 +303,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {

let local_ref = &self.locals[local];

// FIXME Should the return place be named?
let name = if bx.sess().fewer_names() || local == mir::RETURN_PLACE {
let name = if bx.sess().fewer_names() {
None
} else {
Some(match whole_local_var.or(fallback_var.clone()) {
Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_const_eval/src/transform/check_consts/check.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -643,7 +643,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
if base_ty.is_unsafe_ptr() {
if proj_base.is_empty() {
let decl = &self.body.local_decls[place_local];
if let LocalInfo::StaticRef { def_id, .. } = *decl.local_info() {
if let Some(box LocalInfo::StaticRef { def_id, .. }) = decl.local_info {
let span = decl.source_info.span;
self.check_static(def_id, span);
return;
Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_const_eval/src/transform/check_consts/ops.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -704,7 +704,7 @@ pub mod ty {

fn importance(&self) -> DiagnosticImportance {
match self.0 {
mir::LocalKind::Temp => DiagnosticImportance::Secondary,
mir::LocalKind::Var | mir::LocalKind::Temp => DiagnosticImportance::Secondary,
mir::LocalKind::ReturnPointer | mir::LocalKind::Arg => {
DiagnosticImportance::Primary
}
Expand Down
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