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Auto merge of #108944 - cjgillot:clear-local-info, r=oli-obk
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Wrap the whole LocalInfo in ClearCrossCrate.

MIR contains a lot of information about locals. The primary purpose of this information is the quality of borrowck diagnostics.

This PR aims to drop this information after MIR analyses are finished, ie. starting from post-cleanup runtime MIR.
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@bors
bors committed Mar 16, 2023
2 parents e386217 + 2adf2cd commit 511364e
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Showing 30 changed files with 188 additions and 214 deletions.
29 changes: 15 additions & 14 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 @@ -1985,16 +1985,18 @@ 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::ReturnPointer | LocalKind::Temp => {
bug!("temporary or return pointer with a name")
LocalKind::Temp if self.body.local_decls[local].is_user_variable() => {
"local variable "
}
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 @@ -2008,16 +2010,16 @@ 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::Var => {
LocalKind::Temp if self.body.local_decls[local].is_user_variable() => {
("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 @@ -2482,15 +2484,14 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
let (place_description, assigned_span) = match local_decl {
Some(LocalDecl {
local_info:
Some(box LocalInfo::User(
ClearCrossCrate::Clear
| ClearCrossCrate::Set(BindingForm::Var(VarBindingForm {
ClearCrossCrate::Set(
box LocalInfo::User(BindingForm::Var(VarBindingForm {
opt_match_place: None,
..
})),
))
| Some(box LocalInfo::StaticRef { .. })
| None,
}))
| box LocalInfo::StaticRef { .. }
| box LocalInfo::Boring,
),
..
})
| 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, Location, Operand, Place, Rvalue,
Statement, StatementKind, TerminatorKind,
Body, CastKind, ConstraintCategory, FakeReadCause, Local, LocalInfo, 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 Some(info) = &local_decl.is_block_tail {
if let LocalInfo::BlockTailTemp(info) = local_decl.local_info() {
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 Some(box LocalInfo::StaticRef { def_id, .. }) =
&self.body.local_decls[local].local_info
if let 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: 8 additions & 11 deletions compiler/rustc_borrowck/src/diagnostics/move_errors.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -102,14 +102,12 @@ 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 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
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()
{
let stmt_source_info = self.body.source_info(location);
self.append_binding_error(
Expand Down Expand Up @@ -478,9 +476,8 @@ 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 Some(box LocalInfo::User(ClearCrossCrate::Set(BindingForm::Var(
VarBindingForm { pat_span, .. },
)))) = bind_to.local_info
if let LocalInfo::User(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: 38 additions & 54 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, ClearCrossCrate, Local, LocalDecl, LocalInfo, LocalKind, Location},
mir::{self, BindingForm, 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 Some(box LocalInfo::StaticRef { def_id, .. }) = *local_info {
let local_info = self.body.local_decls[local].local_info();
if let 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 @@ -305,15 +305,13 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
..
}) = &self.body[location.block].statements.get(location.statement_index)
{
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: _,
},
)))) => {
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: _,
})) => {
if suggest {
err.span_note(sp, "the binding is already a mutable borrow");
}
Expand Down Expand Up @@ -346,10 +344,8 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
}
} else if decl.mutability.is_not() {
if matches!(
decl.local_info,
Some(box LocalInfo::User(ClearCrossCrate::Set(BindingForm::ImplicitSelf(
hir::ImplicitSelfKind::MutRef
),)))
decl.local_info(),
LocalInfo::User(BindingForm::ImplicitSelf(hir::ImplicitSelfKind::MutRef))
) {
err.note(
"as `Self` may be unsized, this call attempts to take `&mut &mut self`",
Expand Down Expand Up @@ -482,22 +478,18 @@ 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.as_deref().unwrap() {
LocalInfo::User(ClearCrossCrate::Set(
mir::BindingForm::ImplicitSelf(_),
)) => {
let label = match *local_decl.local_info() {
LocalInfo::User(mir::BindingForm::ImplicitSelf(_)) => {
let (span, suggestion) =
suggest_ampmut_self(self.infcx.tcx, local_decl);
Some((true, span, suggestion))
}

LocalInfo::User(ClearCrossCrate::Set(mir::BindingForm::Var(
mir::VarBindingForm {
binding_mode: ty::BindingMode::BindByValue(_),
opt_ty_info,
..
},
))) => {
LocalInfo::User(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 @@ -534,16 +526,15 @@ 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.as_deref() {
Some(LocalInfo::User(ClearCrossCrate::Set(
mir::BindingForm::Var(mir::VarBindingForm {
opt_ty_info: None,
..
}),
))) => {
match local_decl.local_info() {
LocalInfo::User(mir::BindingForm::Var(
mir::VarBindingForm {
opt_ty_info: None, ..
},
)) => {
let (span, sugg) = suggest_ampmut_self(
self.infcx.tcx,
local_decl,
Expand All @@ -555,7 +546,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
self.infcx.tcx,
local_decl,
opt_assignment_rhs_span,
*opt_ty_info,
opt_ty_info,
),
}
};
Expand All @@ -564,21 +555,15 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
}
}

LocalInfo::User(ClearCrossCrate::Set(mir::BindingForm::Var(
mir::VarBindingForm {
binding_mode: ty::BindingMode::BindByReference(_),
..
},
))) => {
LocalInfo::User(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 @@ -1151,20 +1136,19 @@ 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.as_deref() {
match *local_decl.local_info() {
// Check if mutably borrowing a mutable reference.
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)))) => {
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)) => {
// 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: 2 additions & 5 deletions compiler/rustc_borrowck/src/type_check/mod.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1180,10 +1180,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
}
}
Some(l)
if matches!(
body.local_decls[l].local_info,
Some(box LocalInfo::AggregateTemp)
) =>
if matches!(body.local_decls[l].local_info(), LocalInfo::AggregateTemp) =>
{
ConstraintCategory::Usage
}
Expand Down Expand Up @@ -1684,7 +1681,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
// - maybe we should make that a warning.
return;
}
LocalKind::Var | LocalKind::Temp => {}
LocalKind::Temp => {}
}

// When `unsized_fn_params` or `unsized_locals` is enabled, only function calls
Expand Down
9 changes: 2 additions & 7 deletions compiler/rustc_codegen_ssa/src/mir/debuginfo.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -241,12 +241,6 @@ 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 @@ -303,7 +297,8 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {

let local_ref = &self.locals[local];

let name = if bx.sess().fewer_names() {
// FIXME Should the return place be named?
let name = if bx.sess().fewer_names() || local == mir::RETURN_PLACE {
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 Some(box LocalInfo::StaticRef { def_id, .. }) = decl.local_info {
if let 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::Var | mir::LocalKind::Temp => DiagnosticImportance::Secondary,
mir::LocalKind::Temp => DiagnosticImportance::Secondary,
mir::LocalKind::ReturnPointer | mir::LocalKind::Arg => {
DiagnosticImportance::Primary
}
Expand Down
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