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Add View Mir command and fix some bugs

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This commit is contained in:
hkalbasi 2023-02-26 16:04:41 +03:30
parent a25710b0c0
commit ac04bfd7a7
23 changed files with 876 additions and 122 deletions
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5
crates/hir-ty/src/db.rs
View file

@ -18,7 +18,7 @@ use crate::{
chalk_db,
consteval::ConstEvalError,
method_resolution::{InherentImpls, TraitImpls, TyFingerprint},
mir::{MirBody, MirLowerError},
mir::{BorrowckResult, MirBody, MirLowerError},
Binders, CallableDefId, Const, FnDefId, GenericArg, ImplTraitId, InferenceResult, Interner,
PolyFnSig, QuantifiedWhereClause, ReturnTypeImplTraits, Substitution, TraitRef, Ty, TyDefId,
ValueTyDefId,
@ -38,6 +38,9 @@ pub trait HirDatabase: DefDatabase + Upcast<dyn DefDatabase> {
#[salsa::cycle(crate::mir::mir_body_recover)]
fn mir_body(&self, def: DefWithBodyId) -> Result<Arc<MirBody>, MirLowerError>;
#[salsa::invoke(crate::mir::borrowck_query)]
fn borrowck(&self, def: DefWithBodyId) -> Result<Arc<BorrowckResult>, MirLowerError>;
#[salsa::invoke(crate::lower::ty_query)]
#[salsa::cycle(crate::lower::ty_recover)]
fn ty(&self, def: TyDefId) -> Binders<Ty>;

1
crates/hir-ty/src/display.rs
View file

@ -531,6 +531,7 @@ fn render_const_scalar(
hir_def::AdtId::UnionId(u) => write!(f, "{}", f.db.union_data(u).name),
hir_def::AdtId::EnumId(_) => f.write_str("<enum-not-supported>"),
},
chalk_ir::TyKind::FnDef(..) => ty.hir_fmt(f),
_ => f.write_str("<not-supported>"),
}
}

39
crates/hir-ty/src/mir.rs
View file

@ -1,6 +1,6 @@
//! MIR definitions and implementation
use std::iter;
use std::{fmt::Display, iter};
use crate::{
infer::PointerCast, Const, ConstScalar, InferenceResult, Interner, MemoryMap, Substitution, Ty,
@ -14,8 +14,10 @@ use la_arena::{Arena, ArenaMap, Idx, RawIdx};
mod eval;
mod lower;
pub mod borrowck;
mod borrowck;
mod pretty;
pub use borrowck::{borrowck_query, BorrowckResult, MutabilityReason};
pub use eval::{interpret_mir, pad16, Evaluator, MirEvalError};
pub use lower::{lower_to_mir, mir_body_query, mir_body_recover, MirLowerError};
use smallvec::{smallvec, SmallVec};
@ -32,13 +34,7 @@ fn return_slot() -> LocalId {
#[derive(Debug, PartialEq, Eq)]
pub struct Local {
pub mutability: Mutability,
//pub local_info: Option<Box<LocalInfo>>,
//pub internal: bool,
//pub is_block_tail: Option<BlockTailInfo>,
pub ty: Ty,
//pub user_ty: Option<Box<UserTypeProjections>>,
//pub source_info: SourceInfo,
}
/// An operand in MIR represents a "value" in Rust, the definition of which is undecided and part of
@ -564,6 +560,30 @@ pub enum BinOp {
Offset,
}
impl Display for BinOp {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.write_str(match self {
BinOp::Add => "+",
BinOp::Sub => "-",
BinOp::Mul => "*",
BinOp::Div => "/",
BinOp::Rem => "%",
BinOp::BitXor => "^",
BinOp::BitAnd => "&",
BinOp::BitOr => "|",
BinOp::Shl => "<<",
BinOp::Shr => ">>",
BinOp::Eq => "==",
BinOp::Lt => "<",
BinOp::Le => "<=",
BinOp::Ne => "!=",
BinOp::Ge => ">=",
BinOp::Gt => ">",
BinOp::Offset => "`offset`",
})
}
}
impl From<hir_def::expr::ArithOp> for BinOp {
fn from(value: hir_def::expr::ArithOp) -> Self {
match value {
@ -822,10 +842,9 @@ pub struct MirBody {
pub owner: DefWithBodyId,
pub arg_count: usize,
pub binding_locals: ArenaMap<BindingId, LocalId>,
pub param_locals: Vec<LocalId>,
}
impl MirBody {}
fn const_as_usize(c: &Const) -> usize {
try_const_usize(c).unwrap() as usize
}

71
crates/hir-ty/src/mir/borrowck.rs
View file

@ -1,22 +1,43 @@
//! MIR borrow checker, which is used in diagnostics like `unused_mut`
// Currently it is an ad-hoc implementation, only useful for mutability analysis. Feel free to remove all of these
// and implement a proper borrow checker.
// if needed for implementing a proper borrow checker.
use std::sync::Arc;
use hir_def::DefWithBodyId;
use la_arena::ArenaMap;
use stdx::never;
use crate::db::HirDatabase;
use super::{
BasicBlockId, BorrowKind, LocalId, MirBody, MirSpan, Place, ProjectionElem, Rvalue,
StatementKind, Terminator,
BasicBlockId, BorrowKind, LocalId, MirBody, MirLowerError, MirSpan, Place, ProjectionElem,
Rvalue, StatementKind, Terminator,
};
#[derive(Debug)]
pub enum Mutability {
Mut { span: MirSpan },
#[derive(Debug, Clone, PartialEq, Eq)]
/// Stores spans which implies that the local should be mutable.
pub enum MutabilityReason {
Mut { spans: Vec<MirSpan> },
Not,
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct BorrowckResult {
pub mir_body: Arc<MirBody>,
pub mutability_of_locals: ArenaMap<LocalId, MutabilityReason>,
}
pub fn borrowck_query(
db: &dyn HirDatabase,
def: DefWithBodyId,
) -> Result<Arc<BorrowckResult>, MirLowerError> {
let body = db.mir_body(def)?;
let r = BorrowckResult { mutability_of_locals: mutability_of_locals(&body), mir_body: body };
Ok(Arc::new(r))
}
fn is_place_direct(lvalue: &Place) -> bool {
!lvalue.projection.iter().any(|x| *x == ProjectionElem::Deref)
}
@ -116,28 +137,28 @@ fn ever_initialized_map(body: &MirBody) -> ArenaMap<BasicBlockId, ArenaMap<Local
}
}
}
for (b, block) in body.basic_blocks.iter() {
for statement in &block.statements {
if let StatementKind::Assign(p, _) = &statement.kind {
if p.projection.len() == 0 {
let l = p.local;
if !result[b].contains_idx(l) {
result[b].insert(l, false);
dfs(body, b, l, &mut result);
}
}
for &l in &body.param_locals {
result[body.start_block].insert(l, true);
dfs(body, body.start_block, l, &mut result);
}
for l in body.locals.iter().map(|x| x.0) {
if !result[body.start_block].contains_idx(l) {
result[body.start_block].insert(l, false);
dfs(body, body.start_block, l, &mut result);
}
}
result
}
pub fn mutability_of_locals(body: &MirBody) -> ArenaMap<LocalId, Mutability> {
let mut result: ArenaMap<LocalId, Mutability> =
body.locals.iter().map(|x| (x.0, Mutability::Not)).collect();
fn mutability_of_locals(body: &MirBody) -> ArenaMap<LocalId, MutabilityReason> {
let mut result: ArenaMap<LocalId, MutabilityReason> =
body.locals.iter().map(|x| (x.0, MutabilityReason::Not)).collect();
let mut push_mut_span = |local, span| match &mut result[local] {
MutabilityReason::Mut { spans } => spans.push(span),
x @ MutabilityReason::Not => *x = MutabilityReason::Mut { spans: vec![span] },
};
let ever_init_maps = ever_initialized_map(body);
for (block_id, ever_init_map) in ever_init_maps.iter() {
let mut ever_init_map = ever_init_map.clone();
for (block_id, mut ever_init_map) in ever_init_maps.into_iter() {
let block = &body.basic_blocks[block_id];
for statement in &block.statements {
match &statement.kind {
@ -145,20 +166,20 @@ pub fn mutability_of_locals(body: &MirBody) -> ArenaMap<LocalId, Mutability> {
match place_case(place) {
ProjectionCase::Direct => {
if ever_init_map.get(place.local).copied().unwrap_or_default() {
result[place.local] = Mutability::Mut { span: statement.span };
push_mut_span(place.local, statement.span);
} else {
ever_init_map.insert(place.local, true);
}
}
ProjectionCase::DirectPart => {
// Partial initialization is not supported, so it is definitely `mut`
result[place.local] = Mutability::Mut { span: statement.span };
push_mut_span(place.local, statement.span);
}
ProjectionCase::Indirect => (),
}
if let Rvalue::Ref(BorrowKind::Mut { .. }, p) = value {
if is_place_direct(p) {
result[p.local] = Mutability::Mut { span: statement.span };
push_mut_span(p.local, statement.span);
}
}
}
@ -189,7 +210,7 @@ pub fn mutability_of_locals(body: &MirBody) -> ArenaMap<LocalId, Mutability> {
Terminator::Call { destination, .. } => {
if destination.projection.len() == 0 {
if ever_init_map.get(destination.local).copied().unwrap_or_default() {
result[destination.local] = Mutability::Mut { span: MirSpan::Unknown };
push_mut_span(destination.local, MirSpan::Unknown);
} else {
ever_init_map.insert(destination.local, true);
}

64
crates/hir-ty/src/mir/lower.rs
View file

@ -16,7 +16,7 @@ use hir_def::{
use la_arena::ArenaMap;
use crate::{
consteval::ConstEvalError, db::HirDatabase, infer::TypeMismatch,
consteval::ConstEvalError, db::HirDatabase, display::HirDisplay, infer::TypeMismatch,
inhabitedness::is_ty_uninhabited_from, layout::layout_of_ty, mapping::ToChalk, utils::generics,
Adjust, AutoBorrow, CallableDefId, TyBuilder, TyExt,
};
@ -46,6 +46,7 @@ pub enum MirLowerError {
LayoutError(LayoutError),
IncompleteExpr,
UnresolvedName(String),
RecordLiteralWithoutPath,
UnresolvedMethod,
UnresolvedField,
MissingFunctionDefinition,
@ -88,7 +89,7 @@ impl MirLowerCtx<'_> {
if matches!(ty.kind(Interner), TyKind::Slice(_) | TyKind::Dyn(_)) {
not_supported!("unsized temporaries");
}
Ok(self.result.locals.alloc(Local { mutability: Mutability::Not, ty }))
Ok(self.result.locals.alloc(Local { ty }))
}
fn lower_expr_as_place(&self, expr_id: ExprId) -> Option<Place> {
@ -251,7 +252,7 @@ impl MirLowerCtx<'_> {
match &self.body.exprs[expr_id] {
Expr::Missing => Err(MirLowerError::IncompleteExpr),
Expr::Path(p) => {
let unresolved_name = || MirLowerError::UnresolvedName("".to_string());
let unresolved_name = || MirLowerError::UnresolvedName(p.display(self.db).to_string());
let resolver = resolver_for_expr(self.db.upcast(), self.owner, expr_id);
let pr = resolver
.resolve_path_in_value_ns(self.db.upcast(), p.mod_path())
@ -259,19 +260,29 @@ impl MirLowerCtx<'_> {
let pr = match pr {
ResolveValueResult::ValueNs(v) => v,
ResolveValueResult::Partial(..) => {
return match self
if let Some(assoc) = self
.infer
.assoc_resolutions_for_expr(expr_id)
.ok_or_else(unresolved_name)?
.0
//.ok_or(ConstEvalError::SemanticError("unresolved assoc item"))?
{
match assoc.0 {
hir_def::AssocItemId::ConstId(c) => {
self.lower_const(c, current, place, expr_id.into())?;
Ok(Some(current))
return Ok(Some(current))
},
_ => return Err(unresolved_name()),
};
_ => not_supported!("associated functions and types"),
}
} else if let Some(variant) = self
.infer
.variant_resolution_for_expr(expr_id)
{
match variant {
VariantId::EnumVariantId(e) => ValueNs::EnumVariantId(e),
VariantId::StructId(s) => ValueNs::StructId(s),
VariantId::UnionId(_) => return Err(MirLowerError::ImplementationError("Union variant as path")),
}
} else {
return Err(unresolved_name());
}
}
};
match pr {
@ -597,11 +608,14 @@ impl MirLowerCtx<'_> {
Ok(None)
}
Expr::Yield { .. } => not_supported!("yield"),
Expr::RecordLit { fields, .. } => {
Expr::RecordLit { fields, path, .. } => {
let variant_id = self
.infer
.variant_resolution_for_expr(expr_id)
.ok_or_else(|| MirLowerError::UnresolvedName("".to_string()))?;
.ok_or_else(|| match path {
Some(p) => MirLowerError::UnresolvedName(p.display(self.db).to_string()),
None => MirLowerError::RecordLiteralWithoutPath,
})?;
let subst = match self.expr_ty(expr_id).kind(Interner) {
TyKind::Adt(_, s) => s.clone(),
_ => not_supported!("Non ADT record literal"),
@ -1437,17 +1451,17 @@ pub fn lower_to_mir(
basic_blocks.alloc(BasicBlock { statements: vec![], terminator: None, is_cleanup: false });
let mut locals = Arena::new();
// 0 is return local
locals.alloc(Local { mutability: Mutability::Mut, ty: infer[root_expr].clone() });
locals.alloc(Local { ty: infer[root_expr].clone() });
let mut binding_locals: ArenaMap<BindingId, LocalId> = ArenaMap::new();
let param_locals: ArenaMap<PatId, LocalId> = if let DefWithBodyId::FunctionId(fid) = owner {
// 1 to param_len is for params
let param_locals: Vec<LocalId> = if let DefWithBodyId::FunctionId(fid) = owner {
let substs = TyBuilder::placeholder_subst(db, fid);
let callable_sig = db.callable_item_signature(fid.into()).substitute(Interner, &substs);
// 1 to param_len is for params
body.params
.iter()
.zip(callable_sig.params().iter())
.map(|(&x, ty)| {
let local_id = locals.alloc(Local { mutability: Mutability::Not, ty: ty.clone() });
let local_id = locals.alloc(Local { ty: ty.clone() });
if let Pat::Bind { id, subpat: None } = body[x] {
if matches!(
body.bindings[id].mode,
@ -1456,22 +1470,19 @@ pub fn lower_to_mir(
binding_locals.insert(id, local_id);
}
}
(x, local_id)
local_id
})
.collect()
} else {
if !body.params.is_empty() {
return Err(MirLowerError::TypeError("Unexpected parameter for non function body"));
}
ArenaMap::new()
vec![]
};
// and then rest of bindings
for (id, _) in body.bindings.iter() {
if !binding_locals.contains_idx(id) {
binding_locals.insert(
id,
locals.alloc(Local { mutability: Mutability::Not, ty: infer[id].clone() }),
);
binding_locals.insert(id, locals.alloc(Local { ty: infer[id].clone() }));
}
}
let mir = MirBody {
@ -1479,6 +1490,7 @@ pub fn lower_to_mir(
locals,
start_block,
binding_locals,
param_locals,
owner,
arg_count: body.params.len(),
};
@ -1492,17 +1504,17 @@ pub fn lower_to_mir(
discr_temp: None,
};
let mut current = start_block;
for &param in &body.params {
for (&param, local) in body.params.iter().zip(ctx.result.param_locals.clone().into_iter()) {
if let Pat::Bind { id, .. } = body[param] {
if param_locals[param] == ctx.result.binding_locals[id] {
if local == ctx.result.binding_locals[id] {
continue;
}
}
let r = ctx.pattern_match(
current,
None,
param_locals[param].into(),
ctx.result.locals[param_locals[param]].ty.clone(),
local.into(),
ctx.result.locals[local].ty.clone(),
param,
BindingAnnotation::Unannotated,
)?;

348
crates/hir-ty/src/mir/pretty.rs Normal file
View file

@ -0,0 +1,348 @@
//! A pretty-printer for MIR.
use std::fmt::{Display, Write};
use hir_def::{body::Body, expr::BindingId};
use hir_expand::name::Name;
use la_arena::ArenaMap;
use crate::{
db::HirDatabase,
display::HirDisplay,
mir::{PlaceElem, ProjectionElem, StatementKind, Terminator},
};
use super::{
AggregateKind, BasicBlockId, BorrowKind, LocalId, MirBody, Operand, Place, Rvalue, UnOp,
};
impl MirBody {
pub fn pretty_print(&self, db: &dyn HirDatabase) -> String {
let hir_body = db.body(self.owner);
let mut ctx = MirPrettyCtx::new(self, &hir_body, db);
ctx.for_body();
ctx.result
}
}
struct MirPrettyCtx<'a> {
body: &'a MirBody,
hir_body: &'a Body,
db: &'a dyn HirDatabase,
result: String,
ident: String,
local_to_binding: ArenaMap<LocalId, BindingId>,
}
macro_rules! w {
($dst:expr, $($arg:tt)*) => {
{ let _ = write!($dst, $($arg)*); }
};
}
macro_rules! wln {
($dst:expr) => {
{ let _ = writeln!($dst); }
};
($dst:expr, $($arg:tt)*) => {
{ let _ = writeln!($dst, $($arg)*); }
};
}
impl Write for MirPrettyCtx<'_> {
fn write_str(&mut self, s: &str) -> std::fmt::Result {
let mut it = s.split('\n'); // note: `.lines()` is wrong here
self.write(it.next().unwrap_or_default());
for line in it {
self.write_line();
self.write(line);
}
Ok(())
}
}
enum LocalName {
Unknown(LocalId),
Binding(Name, LocalId),
}
impl Display for LocalName {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
LocalName::Unknown(l) => write!(f, "_{}", u32::from(l.into_raw())),
LocalName::Binding(n, l) => write!(f, "{n}_{}", u32::from(l.into_raw())),
}
}
}
impl<'a> MirPrettyCtx<'a> {
fn for_body(&mut self) {
self.with_block(|this| {
this.locals();
wln!(this);
this.blocks();
});
}
fn with_block(&mut self, f: impl FnOnce(&mut MirPrettyCtx<'_>)) {
self.ident += " ";
wln!(self, "{{");
f(self);
for _ in 0..4 {
self.result.pop();
self.ident.pop();
}
wln!(self, "}}");
}
fn new(body: &'a MirBody, hir_body: &'a Body, db: &'a dyn HirDatabase) -> Self {
let local_to_binding = body.binding_locals.iter().map(|(x, y)| (*y, x)).collect();
MirPrettyCtx {
body,
db,
result: String::new(),
ident: String::new(),
local_to_binding,
hir_body,
}
}
fn write_line(&mut self) {
self.result.push('\n');
self.result += &self.ident;
}
fn write(&mut self, line: &str) {
self.result += line;
}
fn locals(&mut self) {
for (id, local) in self.body.locals.iter() {
wln!(self, "let {}: {};", self.local_name(id), local.ty.display(self.db));
}
}
fn local_name(&self, local: LocalId) -> LocalName {
match self.local_to_binding.get(local) {
Some(b) => LocalName::Binding(self.hir_body.bindings[*b].name.clone(), local),
None => LocalName::Unknown(local),
}
}
fn basic_block_id(&self, basic_block_id: BasicBlockId) -> String {
format!("'bb{}", u32::from(basic_block_id.into_raw()))
}
fn blocks(&mut self) {
for (id, block) in self.body.basic_blocks.iter() {
wln!(self);
w!(self, "{}: ", self.basic_block_id(id));
self.with_block(|this| {
for statement in &block.statements {
match &statement.kind {
StatementKind::Assign(l, r) => {
this.place(l);
w!(this, " = ");
this.rvalue(r);
wln!(this, ";");
}
StatementKind::StorageDead(p) => {
wln!(this, "StorageDead({})", this.local_name(*p));
}
StatementKind::StorageLive(p) => {
wln!(this, "StorageLive({})", this.local_name(*p));
}
StatementKind::Deinit(p) => {
w!(this, "Deinit(");
this.place(p);
wln!(this, ");");
}
StatementKind::Nop => wln!(this, "Nop;"),
}
}
match &block.terminator {
Some(terminator) => match terminator {
Terminator::Goto { target } => {
wln!(this, "goto 'bb{};", u32::from(target.into_raw()))
}
Terminator::SwitchInt { discr, targets } => {
w!(this, "switch ");
this.operand(discr);
w!(this, " ");
this.with_block(|this| {
for (c, b) in targets.iter() {
wln!(this, "{c} => {},", this.basic_block_id(b));
}
wln!(this, "_ => {},", this.basic_block_id(targets.otherwise()));
});
}
Terminator::Call { func, args, destination, target, .. } => {
w!(this, "Call ");
this.with_block(|this| {
w!(this, "func: ");
this.operand(func);
wln!(this, ",");
w!(this, "args: [");
this.operand_list(args);
wln!(this, "],");
w!(this, "destination: ");
this.place(destination);
wln!(this, ",");
w!(this, "target: ");
match target {
Some(t) => w!(this, "{}", this.basic_block_id(*t)),
None => w!(this, "<unreachable>"),
}
wln!(this, ",");
});
}
_ => wln!(this, "{:?};", terminator),
},
None => wln!(this, "<no-terminator>;"),
}
})
}
}
fn place(&mut self, p: &Place) {
fn f(this: &mut MirPrettyCtx<'_>, local: LocalId, projections: &[PlaceElem]) {
let Some((last, head)) = projections.split_last() else {
// no projection
w!(this, "{}", this.local_name(local));
return;
};
match last {
ProjectionElem::Deref => {
w!(this, "(*");
f(this, local, head);
w!(this, ")");
}
ProjectionElem::Field(field) => {
let variant_data = field.parent.variant_data(this.db.upcast());
let name = &variant_data.fields()[field.local_id].name;
match field.parent {
hir_def::VariantId::EnumVariantId(e) => {
w!(this, "(");
f(this, local, head);
let variant_name =
&this.db.enum_data(e.parent).variants[e.local_id].name;
w!(this, " as {}).{}", variant_name, name);
}
hir_def::VariantId::StructId(_) | hir_def::VariantId::UnionId(_) => {
f(this, local, head);
w!(this, ".{name}");
}
}
}
ProjectionElem::TupleField(x) => {
f(this, local, head);
w!(this, ".{}", x);
}
ProjectionElem::Index(l) => {
f(this, local, head);
w!(this, "[{}]", this.local_name(*l));
}
x => {
f(this, local, head);
w!(this, ".{:?}", x);
}
}
}
f(self, p.local, &p.projection);
}
fn operand(&mut self, r: &Operand) {
match r {
Operand::Copy(p) | Operand::Move(p) => {
// MIR at the time of writing doesn't have difference between move and copy, so we show them
// equally. Feel free to change it.
self.place(p);
}
Operand::Constant(c) => w!(self, "Const({})", c.display(self.db)),
}
}
fn rvalue(&mut self, r: &Rvalue) {
match r {
Rvalue::Use(op) => self.operand(op),
Rvalue::Ref(r, p) => {
match r {
BorrowKind::Shared => w!(self, "&"),
BorrowKind::Shallow => w!(self, "&shallow "),
BorrowKind::Unique => w!(self, "&uniq "),
BorrowKind::Mut { .. } => w!(self, "&mut "),
}
self.place(p);
}
Rvalue::Aggregate(AggregateKind::Tuple(_), x) => {
w!(self, "(");
self.operand_list(x);
w!(self, ")");
}
Rvalue::Aggregate(AggregateKind::Array(_), x) => {
w!(self, "[");
self.operand_list(x);
w!(self, "]");
}
Rvalue::Aggregate(AggregateKind::Adt(_, _), x) => {
w!(self, "Adt(");
self.operand_list(x);
w!(self, ")");
}
Rvalue::Aggregate(AggregateKind::Union(_, _), x) => {
w!(self, "Union(");
self.operand_list(x);
w!(self, ")");
}
Rvalue::Len(p) => {
w!(self, "Len(");
self.place(p);
w!(self, ")");
}
Rvalue::Cast(ck, op, ty) => {
w!(self, "Discriminant({ck:?}");
self.operand(op);
w!(self, "{})", ty.display(self.db));
}
Rvalue::CheckedBinaryOp(b, o1, o2) => {
self.operand(o1);
w!(self, " {b} ");
self.operand(o2);
}
Rvalue::UnaryOp(u, o) => {
let u = match u {
UnOp::Not => "!",
UnOp::Neg => "-",
};
w!(self, "{u} ");
self.operand(o);
}
Rvalue::Discriminant(p) => {
w!(self, "Discriminant(");
self.place(p);
w!(self, ")");
}
Rvalue::ShallowInitBox(op, _) => {
w!(self, "ShallowInitBox(");
self.operand(op);
w!(self, ")");
}
Rvalue::CopyForDeref(p) => {
w!(self, "CopyForDeref(");
self.place(p);
w!(self, ")");
}
}
}
fn operand_list(&mut self, x: &[Operand]) {
let mut it = x.iter();
if let Some(first) = it.next() {
self.operand(first);
for op in it {
w!(self, ", ");
self.operand(op);
}
}
}
}

12
crates/hir/src/has_source.rs
View file

@ -10,8 +10,8 @@ use hir_expand::InFile;
use syntax::ast;
use crate::{
db::HirDatabase, Adt, Const, Enum, Field, FieldSource, Function, Impl, LifetimeParam, Macro,
Module, Static, Struct, Trait, TraitAlias, TypeAlias, TypeOrConstParam, Union, Variant,
db::HirDatabase, Adt, Const, Enum, Field, FieldSource, Function, Impl, LifetimeParam,
LocalSource, Macro, Module, Static, Struct, Trait, TypeAlias, TraitAlias, TypeOrConstParam, Union, Variant,
};
pub trait HasSource {
@ -178,3 +178,11 @@ impl HasSource for LifetimeParam {
Some(child_source.map(|it| it[self.id.local_id].clone()))
}
}
impl HasSource for LocalSource {
type Ast = Either<ast::IdentPat, ast::SelfParam>;
fn source(self, _: &dyn HirDatabase) -> Option<InFile<Self::Ast>> {
Some(self.source)
}
}

28
crates/hir/src/lib.rs
View file

@ -1327,6 +1327,15 @@ impl DefWithBody {
body.pretty_print(db.upcast(), self.id())
}
/// A textual representation of the MIR of this def's body for debugging purposes.
pub fn debug_mir(self, db: &dyn HirDatabase) -> String {
let body = db.mir_body(self.id());
match body {
Ok(body) => body.pretty_print(db),
Err(e) => format!("error:\n{e:?}"),
}
}
pub fn diagnostics(self, db: &dyn HirDatabase, acc: &mut Vec<AnyDiagnostic>) {
let krate = self.module(db).id.krate();
@ -1502,15 +1511,17 @@ impl DefWithBody {
let hir_body = db.body(self.into());
if let Ok(mir_body) = db.mir_body(self.into()) {
let mol = mir::borrowck::mutability_of_locals(&mir_body);
if let Ok(borrowck_result) = db.borrowck(self.into()) {
let mir_body = &borrowck_result.mir_body;
let mol = &borrowck_result.mutability_of_locals;
for (binding_id, _) in hir_body.bindings.iter() {
let need_mut = &mol[mir_body.binding_locals[binding_id]];
let local = Local { parent: self.into(), binding_id };
match (need_mut, local.is_mut(db)) {
(mir::borrowck::Mutability::Mut { .. }, true)
| (mir::borrowck::Mutability::Not, false) => (),
(mir::borrowck::Mutability::Mut { span }, false) => {
(mir::MutabilityReason::Mut { .. }, true)
| (mir::MutabilityReason::Not, false) => (),
(mir::MutabilityReason::Mut { spans }, false) => {
for span in spans {
let span: InFile<SyntaxNodePtr> = match span {
mir::MirSpan::ExprId(e) => match source_map.expr_syntax(*e) {
Ok(s) => s.map(|x| x.into()),
@ -1527,7 +1538,8 @@ impl DefWithBody {
};
acc.push(NeedMut { local, span }.into());
}
(mir::borrowck::Mutability::Not, true) => acc.push(UnusedMut { local }.into()),
}
(mir::MutabilityReason::Not, true) => acc.push(UnusedMut { local }.into()),
}
}
}
@ -2519,6 +2531,10 @@ impl LocalSource {
self.source.file_id.original_file(db.upcast())
}
pub fn name(&self) -> Option<ast::Name> {
self.source.value.name()
}
pub fn syntax(&self) -> &SyntaxNode {
self.source.value.syntax()
}

3
crates/ide-db/src/rename.rs
View file

@ -121,8 +121,7 @@ impl Definition {
Definition::Trait(it) => name_range(it, sema),
Definition::TraitAlias(it) => name_range(it, sema),
Definition::TypeAlias(it) => name_range(it, sema),
// A local might be `self` or have multiple definitons like `let (a | a) = 2`, so it should be handled as a special case
Definition::Local(_) => return None,
Definition::Local(it) => name_range(it.primary_source(sema.db), sema),
Definition::GenericParam(generic_param) => match generic_param {
hir::GenericParam::LifetimeParam(lifetime_param) => {
let src = lifetime_param.source(sema.db)?;

257
crates/ide-diagnostics/src/handlers/mutability_errors.rs
View file

@ -1,31 +1,85 @@
use crate::{Diagnostic, DiagnosticsContext, Severity};
use ide_db::source_change::SourceChange;
use syntax::{AstNode, SyntaxKind, SyntaxNode, SyntaxToken, T};
use text_edit::TextEdit;
use crate::{fix, Diagnostic, DiagnosticsContext, Severity};
// Diagnostic: need-mut
//
// This diagnostic is triggered on mutating an immutable variable.
pub(crate) fn need_mut(ctx: &DiagnosticsContext<'_>, d: &hir::NeedMut) -> Diagnostic {
let fixes = (|| {
if d.local.is_ref(ctx.sema.db) {
// There is no simple way to add `mut` to `ref x` and `ref mut x`
return None;
}
let file_id = d.span.file_id.file_id()?;
let mut edit_builder = TextEdit::builder();
let use_range = d.span.value.text_range();
for source in d.local.sources(ctx.sema.db) {
let Some(ast) = source.name() else { continue };
edit_builder.insert(ast.syntax().text_range().start(), "mut ".to_string());
}
let edit = edit_builder.finish();
Some(vec![fix(
"remove_mut",
"Remove unnecessary `mut`",
SourceChange::from_text_edit(file_id, edit),
use_range,
)])
})();
Diagnostic::new(
"need-mut",
format!("cannot mutate immutable variable `{}`", d.local.name(ctx.sema.db)),
ctx.sema.diagnostics_display_range(d.span.clone()).range,
)
.with_fixes(fixes)
}
// Diagnostic: unused-mut
//
// This diagnostic is triggered when a mutable variable isn't actually mutated.
pub(crate) fn unused_mut(ctx: &DiagnosticsContext<'_>, d: &hir::UnusedMut) -> Diagnostic {
let ast = d.local.primary_source(ctx.sema.db).syntax_ptr();
let fixes = (|| {
let file_id = ast.file_id.file_id()?;
let mut edit_builder = TextEdit::builder();
let use_range = ast.value.text_range();
for source in d.local.sources(ctx.sema.db) {
let ast = source.syntax();
let Some(mut_token) = token(ast, T![mut]) else { continue };
edit_builder.delete(mut_token.text_range());
if let Some(token) = mut_token.next_token() {
if token.kind() == SyntaxKind::WHITESPACE {
edit_builder.delete(token.text_range());
}
}
}
let edit = edit_builder.finish();
Some(vec![fix(
"remove_mut",
"Remove unnecessary `mut`",
SourceChange::from_text_edit(file_id, edit),
use_range,
)])
})();
let ast = d.local.primary_source(ctx.sema.db).syntax_ptr();
Diagnostic::new(
"unused-mut",
"remove this `mut`",
ctx.sema.diagnostics_display_range(d.local.primary_source(ctx.sema.db).syntax_ptr()).range,
ctx.sema.diagnostics_display_range(ast).range,
)
.severity(Severity::WeakWarning)
.with_fixes(fixes)
}
pub(super) fn token(parent: &SyntaxNode, kind: SyntaxKind) -> Option<SyntaxToken> {
parent.children_with_tokens().filter_map(|it| it.into_token()).find(|it| it.kind() == kind)
}
#[cfg(test)]
mod tests {
use crate::tests::check_diagnostics;
use crate::tests::{check_diagnostics, check_fix};
#[test]
fn unused_mut_simple() {
@ -34,7 +88,7 @@ mod tests {
fn f(_: i32) {}
fn main() {
let mut x = 2;
//^^^^^ weak: remove this `mut`
//^^^^^ 💡 weak: remove this `mut`
f(x);
}
"#,
@ -64,6 +118,144 @@ fn main() {
);
}
#[test]
fn multiple_errors_for_single_variable() {
check_diagnostics(
r#"
fn f(_: i32) {}
fn main() {
let x = 2;
x = 10;
//^^^^^^ 💡 error: cannot mutate immutable variable `x`
x = 5;
//^^^^^ 💡 error: cannot mutate immutable variable `x`
&mut x;
//^^^^^^ 💡 error: cannot mutate immutable variable `x`
f(x);
}
"#,
);
}
#[test]
fn unused_mut_fix() {
check_fix(
r#"
fn f(_: i32) {}
fn main() {
let mu$0t x = 2;
f(x);
}
"#,
r#"
fn f(_: i32) {}
fn main() {
let x = 2;
f(x);
}
"#,
);
check_fix(
r#"
fn f(_: i32) {}
fn main() {
let ((mu$0t x, _) | (_, mut x)) = (2, 3);
f(x);
}
"#,
r#"
fn f(_: i32) {}
fn main() {
let ((x, _) | (_, x)) = (2, 3);
f(x);
}
"#,
);
}
#[test]
fn need_mut_fix() {
check_fix(
r#"
fn f(_: i32) {}
fn main() {
let x = 2;
x$0 = 5;
f(x);
}
"#,
r#"
fn f(_: i32) {}
fn main() {
let mut x = 2;
x = 5;
f(x);
}
"#,
);
check_fix(
r#"
fn f(_: i32) {}
fn main() {
let ((x, _) | (_, x)) = (2, 3);
x =$0 4;
f(x);
}
"#,
r#"
fn f(_: i32) {}
fn main() {
let ((mut x, _) | (_, mut x)) = (2, 3);
x = 4;
f(x);
}
"#,
);
check_fix(
r#"
struct Foo(i32);
impl Foo {
fn foo(self) {
self = Fo$0o(5);
}
}
"#,
r#"
struct Foo(i32);
impl Foo {
fn foo(mut self) {
self = Foo(5);
}
}
"#,
);
}
#[test]
fn need_mut_fix_not_applicable_on_ref() {
check_diagnostics(
r#"
fn main() {
let ref x = 2;
x = &5;
//^^^^^^ error: cannot mutate immutable variable `x`
}
"#,
);
check_diagnostics(
r#"
fn main() {
let ref mut x = 2;
x = &mut 5;
//^^^^^^^^^^ error: cannot mutate immutable variable `x`
}
"#,
);
}
#[test]
fn field_mutate() {
check_diagnostics(
@ -71,7 +263,7 @@ fn main() {
fn f(_: i32) {}
fn main() {
let mut x = (2, 7);
//^^^^^ weak: remove this `mut`
//^^^^^ 💡 weak: remove this `mut`
f(x.1);
}
"#,
@ -92,7 +284,7 @@ fn f(_: i32) {}
fn main() {
let x = (2, 7);
x.0 = 5;
//^^^^^^^ error: cannot mutate immutable variable `x`
//^^^^^^^ 💡 error: cannot mutate immutable variable `x`
f(x.1);
}
"#,
@ -105,7 +297,7 @@ fn main() {
r#"
fn main() {
let mut x = &mut 2;
//^^^^^ weak: remove this `mut`
//^^^^^ 💡 weak: remove this `mut`
*x = 5;
}
"#,
@ -115,7 +307,7 @@ fn main() {
fn main() {
let x = 2;
&mut x;
//^^^^^^ error: cannot mutate immutable variable `x`
//^^^^^^ 💡 error: cannot mutate immutable variable `x`
}
"#,
);
@ -124,7 +316,7 @@ fn main() {
fn main() {
let x_own = 2;
let ref mut x_ref = x_own;
//^^^^^^^^^^^^^ error: cannot mutate immutable variable `x_own`
//^^^^^^^^^^^^^ 💡 error: cannot mutate immutable variable `x_own`
}
"#,
);
@ -137,7 +329,7 @@ impl Foo {
fn main() {
let x = Foo;
x.method(2);
//^ error: cannot mutate immutable variable `x`
//^ 💡 error: cannot mutate immutable variable `x`
}
"#,
);
@ -150,9 +342,9 @@ fn main() {
fn main() {
match (2, 3) {
(x, mut y) => {
//^^^^^ weak: remove this `mut`
//^^^^^ 💡 weak: remove this `mut`
x = 7;
//^^^^^ error: cannot mutate immutable variable `x`
//^^^^^ 💡 error: cannot mutate immutable variable `x`
}
}
}
@ -171,7 +363,7 @@ fn main() {
fn main() {
return;
let mut x = 2;
//^^^^^ weak: remove this `mut`
//^^^^^ 💡 weak: remove this `mut`
&mut x;
}
"#,
@ -181,7 +373,7 @@ fn main() {
fn main() {
loop {}
let mut x = 2;
//^^^^^ weak: remove this `mut`
//^^^^^ 💡 weak: remove this `mut`
&mut x;
}
"#,
@ -202,7 +394,7 @@ fn main(b: bool) {
g();
}
let mut x = 2;
//^^^^^ weak: remove this `mut`
//^^^^^ 💡 weak: remove this `mut`
&mut x;
}
"#,
@ -216,7 +408,7 @@ fn main(b: bool) {
return;
}
let mut x = 2;
//^^^^^ weak: remove this `mut`
//^^^^^ 💡 weak: remove this `mut`
&mut x;
}
"#,
@ -230,7 +422,7 @@ fn main(b: bool) {
fn f(_: i32) {}
fn main() {
let mut x;
//^^^^^ weak: remove this `mut`
//^^^^^ 💡 weak: remove this `mut`
x = 5;
f(x);
}
@ -241,7 +433,7 @@ fn main() {
fn f(_: i32) {}
fn main(b: bool) {
let mut x;
//^^^^^ weak: remove this `mut`
//^^^^^ 💡 weak: remove this `mut`
if b {
x = 1;
} else {
@ -260,7 +452,7 @@ fn main(b: bool) {
x = 1;
}
x = 3;
//^^^^^ error: cannot mutate immutable variable `x`
//^^^^^ 💡 error: cannot mutate immutable variable `x`
f(x);
}
"#,
@ -272,7 +464,7 @@ fn main() {
let x;
loop {
x = 1;
//^^^^^ error: cannot mutate immutable variable `x`
//^^^^^ 💡 error: cannot mutate immutable variable `x`
f(x);
}
}
@ -284,18 +476,37 @@ fn f(_: i32) {}
fn main() {
loop {
let mut x = 1;
//^^^^^ weak: remove this `mut`
//^^^^^ 💡 weak: remove this `mut`
f(x);
if let mut y = 2 {
//^^^^^ weak: remove this `mut`
//^^^^^ 💡 weak: remove this `mut`
f(y);
}
match 3 {
mut z => f(z),
//^^^^^ weak: remove this `mut`
//^^^^^ 💡 weak: remove this `mut`
}
}
}
"#,
);
}
#[test]
fn function_arguments_are_initialized() {
check_diagnostics(
r#"
fn f(mut x: i32) {
//^^^^^ 💡 weak: remove this `mut`
}
"#,
);
check_diagnostics(
r#"
fn f(x: i32) {
x = 5;
//^^^^^ 💡 error: cannot mutate immutable variable `x`
}
"#,
);
}

5
crates/ide/src/lib.rs
View file

@ -55,6 +55,7 @@ mod syntax_tree;
mod typing;
mod view_crate_graph;
mod view_hir;
mod view_mir;
mod view_item_tree;
mod shuffle_crate_graph;
@ -308,6 +309,10 @@ impl Analysis {
self.with_db(|db| view_hir::view_hir(db, position))
}
pub fn view_mir(&self, position: FilePosition) -> Cancellable<String> {
self.with_db(|db| view_mir::view_mir(db, position))
}
pub fn view_item_tree(&self, file_id: FileId) -> Cancellable<String> {
self.with_db(|db| view_item_tree::view_item_tree(db, file_id))
}

22
crates/ide/src/rename.rs
View file

@ -353,6 +353,11 @@ mod tests {
fn check(new_name: &str, ra_fixture_before: &str, ra_fixture_after: &str) {
let ra_fixture_after = &trim_indent(ra_fixture_after);
let (analysis, position) = fixture::position(ra_fixture_before);
if !ra_fixture_after.starts_with("error: ") {
if let Err(err) = analysis.prepare_rename(position).unwrap() {
panic!("Prepare rename to '{new_name}' was failed: {err}")
}
}
let rename_result = analysis
.rename(position, new_name)
.unwrap_or_else(|err| panic!("Rename to '{new_name}' was cancelled: {err}"));
@ -1709,6 +1714,23 @@ fn foo(bar: i32) -> Foo {
);
}
#[test]
fn test_rename_local_simple() {
check(
"i",
r#"
fn foo(bar$0: i32) -> i32 {
bar
}
"#,
r#"
fn foo(i: i32) -> i32 {
i
}
"#,
);
}
#[test]
fn test_rename_local_put_init_shorthand() {
cov_mark::check!(test_rename_local_put_init_shorthand);

29
crates/ide/src/view_mir.rs Normal file
View file

@ -0,0 +1,29 @@
use hir::{DefWithBody, Semantics};
use ide_db::base_db::FilePosition;
use ide_db::RootDatabase;
use syntax::{algo::find_node_at_offset, ast, AstNode};
// Feature: View Mir
//
// |===
// | Editor | Action Name
//
// | VS Code | **rust-analyzer: View Mir**
// |===
pub(crate) fn view_mir(db: &RootDatabase, position: FilePosition) -> String {
body_mir(db, position).unwrap_or_else(|| "Not inside a function body".to_string())
}
fn body_mir(db: &RootDatabase, position: FilePosition) -> Option<String> {
let sema = Semantics::new(db);
let source_file = sema.parse(position.file_id);
let item = find_node_at_offset::<ast::Item>(source_file.syntax(), position.offset)?;
let def: DefWithBody = match item {
ast::Item::Fn(it) => sema.to_def(&it)?.into(),
ast::Item::Const(it) => sema.to_def(&it)?.into(),
ast::Item::Static(it) => sema.to_def(&it)?.into(),
_ => return None,
};
Some(def.debug_mir(db))
}

10
crates/rust-analyzer/src/handlers.rs
View file

@ -134,6 +134,16 @@ pub(crate) fn handle_view_hir(
Ok(res)
}
pub(crate) fn handle_view_mir(
snap: GlobalStateSnapshot,
params: lsp_types::TextDocumentPositionParams,
) -> Result<String> {
let _p = profile::span("handle_view_mir");
let position = from_proto::file_position(&snap, params)?;
let res = snap.analysis.view_mir(position)?;
Ok(res)
}
pub(crate) fn handle_view_file_text(
snap: GlobalStateSnapshot,
params: lsp_types::TextDocumentIdentifier,

8
crates/rust-analyzer/src/lsp_ext.rs
View file

@ -74,6 +74,14 @@ impl Request for ViewHir {
const METHOD: &'static str = "rust-analyzer/viewHir";
}
pub enum ViewMir {}
impl Request for ViewMir {
type Params = lsp_types::TextDocumentPositionParams;
type Result = String;
const METHOD: &'static str = "rust-analyzer/viewMir";
}
pub enum ViewFileText {}
impl Request for ViewFileText {

1
crates/rust-analyzer/src/main_loop.rs
View file

@ -634,6 +634,7 @@ impl GlobalState {
.on::<lsp_ext::AnalyzerStatus>(handlers::handle_analyzer_status)
.on::<lsp_ext::SyntaxTree>(handlers::handle_syntax_tree)
.on::<lsp_ext::ViewHir>(handlers::handle_view_hir)
.on::<lsp_ext::ViewMir>(handlers::handle_view_mir)
.on::<lsp_ext::ViewFileText>(handlers::handle_view_file_text)
.on::<lsp_ext::ViewCrateGraph>(handlers::handle_view_crate_graph)
.on::<lsp_ext::ViewItemTree>(handlers::handle_view_item_tree)

2
crates/syntax/src/ast/traits.rs
View file

@ -134,3 +134,5 @@ impl Iterator for AttrDocCommentIter {
})
}
}
impl<A: HasName, B: HasName> HasName for Either<A, B> {}

13
docs/dev/lsp-extensions.md
View file

@ -1,5 +1,5 @@
<!---
lsp_ext.rs hash: d87477896dfe41d4
lsp_ext.rs hash: 37f31ae648632897
If you need to change the above hash to make the test pass, please check if you
need to adjust this doc as well and ping this issue:
@ -527,6 +527,17 @@ Primarily for debugging, but very useful for all people working on rust-analyzer
Returns a textual representation of the HIR of the function containing the cursor.
For debugging or when working on rust-analyzer itself.
## View Mir
**Method:** `rust-analyzer/viewMir`
**Request:** `TextDocumentPositionParams`
**Response:** `string`
Returns a textual representation of the MIR of the function containing the cursor.
For debugging or when working on rust-analyzer itself.
## View File Text
**Method:** `rust-analyzer/viewFileText`

5
editors/code/package.json
View file

@ -114,6 +114,11 @@
"title": "View Hir",
"category": "rust-analyzer (debug command)"
},
{
"command": "rust-analyzer.viewMir",
"title": "View Mir",
"category": "rust-analyzer (debug command)"
},
{
"command": "rust-analyzer.viewFileText",
"title": "View File Text (as seen by the server)",

27
editors/code/src/commands.ts
View file

@ -405,12 +405,11 @@ export function syntaxTree(ctx: CtxInit): Cmd {
};
}
// Opens the virtual file that will show the HIR of the function containing the cursor position
//
// The contents of the file come from the `TextDocumentContentProvider`
export function viewHir(ctx: CtxInit): Cmd {
function viewHirOrMir(ctx: CtxInit, xir: "hir" | "mir"): Cmd {
const viewXir = xir === "hir" ? "viewHir" : "viewMir";
const requestType = xir === "hir" ? ra.viewHir : ra.viewMir;
const tdcp = new (class implements vscode.TextDocumentContentProvider {
readonly uri = vscode.Uri.parse("rust-analyzer-hir://viewHir/hir.rs");
readonly uri = vscode.Uri.parse(`rust-analyzer-${xir}://${viewXir}/${xir}.rs`);
readonly eventEmitter = new vscode.EventEmitter<vscode.Uri>();
constructor() {
vscode.workspace.onDidChangeTextDocument(
@ -452,7 +451,7 @@ export function viewHir(ctx: CtxInit): Cmd {
),
position: client.code2ProtocolConverter.asPosition(rustEditor.selection.active),
};
return client.sendRequest(ra.viewHir, params, ct);
return client.sendRequest(requestType, params, ct);
}
get onDidChange(): vscode.Event<vscode.Uri> {
@ -461,7 +460,7 @@ export function viewHir(ctx: CtxInit): Cmd {
})();
ctx.pushExtCleanup(
vscode.workspace.registerTextDocumentContentProvider("rust-analyzer-hir", tdcp)
vscode.workspace.registerTextDocumentContentProvider(`rust-analyzer-${xir}`, tdcp)
);
return async () => {
@ -474,6 +473,20 @@ export function viewHir(ctx: CtxInit): Cmd {
};
}
// Opens the virtual file that will show the HIR of the function containing the cursor position
//
// The contents of the file come from the `TextDocumentContentProvider`
export function viewHir(ctx: CtxInit): Cmd {
return viewHirOrMir(ctx, "hir");
}
// Opens the virtual file that will show the MIR of the function containing the cursor position
//
// The contents of the file come from the `TextDocumentContentProvider`
export function viewMir(ctx: CtxInit): Cmd {
return viewHirOrMir(ctx, "mir");
}
export function viewFileText(ctx: CtxInit): Cmd {
const tdcp = new (class implements vscode.TextDocumentContentProvider {
readonly uri = vscode.Uri.parse("rust-analyzer-file-text://viewFileText/file.rs");

3
editors/code/src/lsp_ext.ts
View file

@ -59,6 +59,9 @@ export const viewFileText = new lc.RequestType<lc.TextDocumentIdentifier, string
export const viewHir = new lc.RequestType<lc.TextDocumentPositionParams, string, void>(
"rust-analyzer/viewHir"
);
export const viewMir = new lc.RequestType<lc.TextDocumentPositionParams, string, void>(
"rust-analyzer/viewMir"
);
export const viewItemTree = new lc.RequestType<ViewItemTreeParams, string, void>(
"rust-analyzer/viewItemTree"
);

1
editors/code/src/main.ts
View file

@ -158,6 +158,7 @@ function createCommands(): Record<string, CommandFactory> {
parentModule: { enabled: commands.parentModule },
syntaxTree: { enabled: commands.syntaxTree },
viewHir: { enabled: commands.viewHir },
viewMir: { enabled: commands.viewMir },
viewFileText: { enabled: commands.viewFileText },
viewItemTree: { enabled: commands.viewItemTree },
viewCrateGraph: { enabled: commands.viewCrateGraph },

6
lib/la-arena/src/map.rs
View file

@ -94,6 +94,12 @@ impl<T, V> ArenaMap<Idx<T>, V> {
.filter_map(|(idx, o)| Some((Self::from_idx(idx), o.as_mut()?)))
}
/// Returns an iterator over the arena indexes and values in the map.
// FIXME: Implement `IntoIterator` trait.
pub fn into_iter(self) -> impl Iterator<Item = (Idx<T>, V)> {
self.v.into_iter().enumerate().filter_map(|(idx, o)| Some((Self::from_idx(idx), o?)))
}
/// Gets the given key's corresponding entry in the map for in-place manipulation.
pub fn entry(&mut self, idx: Idx<T>) -> Entry<'_, Idx<T>, V> {
let idx = Self::to_idx(idx);