language-servers/rust-analyzer
1
0
Fork 0
mirror of https://github.com/rust-lang/rust-analyzer.git synced 2025-10-01 22:31:43 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 4

Add lowering of array lengths in types

Browse source 
Now e.g.

```rust
fn a(b: [u8; 2]) {
}
```

will know about the length of b.
This commit is contained in:
Jade 2021-05-12 04:39:48 -07:00
parent 312f1fe20a
commit 8b147624ff
10 changed files with 114 additions and 79 deletions
Download patch file Download diff file Expand all files Collapse all files

26
crates/hir_ty/src/lower.rs
View file

@ -9,7 +9,9 @@ use std::cell::{Cell, RefCell};
use std::{iter, sync::Arc};
use base_db::CrateId;
use chalk_ir::{cast::Cast, fold::Shift, interner::HasInterner, Mutability, Safety};
use chalk_ir::{
cast::Cast, fold::Shift, interner::HasInterner, Mutability, Safety, Scalar, UintTy,
};
use hir_def::{
adt::StructKind,
body::{Expander, LowerCtx},
@ -30,16 +32,15 @@ use syntax::ast;
use crate::{
db::HirDatabase,
dummy_usize_const,
mapping::ToChalk,
static_lifetime, to_assoc_type_id, to_chalk_trait_id, to_placeholder_idx,
utils::{
all_super_trait_refs, associated_type_by_name_including_super_traits, generics, Generics,
},
AliasEq, AliasTy, Binders, BoundVar, CallableSig, DebruijnIndex, DynTy, FnPointer, FnSig,
FnSubst, ImplTraitId, Interner, OpaqueTy, PolyFnSig, ProjectionTy, QuantifiedWhereClause,
QuantifiedWhereClauses, ReturnTypeImplTrait, ReturnTypeImplTraits, Substitution,
TraitEnvironment, TraitRef, TraitRefExt, Ty, TyBuilder, TyKind, WhereClause,
AliasEq, AliasTy, Binders, BoundVar, CallableSig, ConstData, ConstValue, DebruijnIndex, DynTy,
FnPointer, FnSig, FnSubst, ImplTraitId, Interner, OpaqueTy, PolyFnSig, ProjectionTy,
QuantifiedWhereClause, QuantifiedWhereClauses, ReturnTypeImplTrait, ReturnTypeImplTraits,
Substitution, TraitEnvironment, TraitRef, TraitRefExt, Ty, TyBuilder, TyKind, WhereClause,
};
#[derive(Debug)]
@ -172,11 +173,16 @@ impl<'a> TyLoweringContext<'a> {
let inner_ty = self.lower_ty(inner);
TyKind::Raw(lower_to_chalk_mutability(*mutability), inner_ty).intern(&Interner)
}
TypeRef::Array(inner) => {
TypeRef::Array(inner, len) => {
let inner_ty = self.lower_ty(inner);
// FIXME: we don't have length info here because we don't store an expression for
// the length
TyKind::Array(inner_ty, dummy_usize_const()).intern(&Interner)
let const_len = ConstData {
ty: TyKind::Scalar(Scalar::Uint(UintTy::Usize)).intern(&Interner),
value: ConstValue::Concrete(chalk_ir::ConcreteConst { interned: *len }),
}
.intern(&Interner);
TyKind::Array(inner_ty, const_len).intern(&Interner)
}
TypeRef::Slice(inner) => {
let inner_ty = self.lower_ty(inner);