Chalk integration

- add proper canonicalization logic
 - add conversions from/to Chalk IR
This commit is contained in:
Florian Diebold 2019-04-20 12:34:36 +02:00
parent 6269791d36
commit b9c0c2abb7
14 changed files with 800 additions and 149 deletions

121
Cargo.lock generated
View file

@ -143,6 +143,61 @@ name = "cfg-if"
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source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "chalk-engine"
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name = "chalk-rust-ir"
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@ -306,6 +361,14 @@ name = "either"
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@ -540,6 +608,14 @@ dependencies = [
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@ -979,6 +1074,9 @@ name = "ra_hir"
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"checksum lalrpop-intern 0.15.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cc4fd87be4a815fd373e02773983940f0d75fb26fde8c098e9e45f7af03154c0"
"checksum lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bc5729f27f159ddd61f4df6228e827e86643d4d3e7c32183cb30a1c08f604a14" "checksum lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bc5729f27f159ddd61f4df6228e827e86643d4d3e7c32183cb30a1c08f604a14"
"checksum lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b294d6fa9ee409a054354afc4352b0b9ef7ca222c69b8812cbea9e7d2bf3783f" "checksum lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b294d6fa9ee409a054354afc4352b0b9ef7ca222c69b8812cbea9e7d2bf3783f"
"checksum libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)" = "bedcc7a809076656486ffe045abeeac163da1b558e963a31e29fbfbeba916917" "checksum libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)" = "bedcc7a809076656486ffe045abeeac163da1b558e963a31e29fbfbeba916917"
@ -1965,6 +2083,7 @@ dependencies = [
"checksum number_prefix 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "dbf9993e59c894e3c08aa1c2712914e9e6bf1fcbfc6bef283e2183df345a4fee" "checksum number_prefix 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "dbf9993e59c894e3c08aa1c2712914e9e6bf1fcbfc6bef283e2183df345a4fee"
"checksum numtoa 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b8f8bdf33df195859076e54ab11ee78a1b208382d3a26ec40d142ffc1ecc49ef" "checksum numtoa 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b8f8bdf33df195859076e54ab11ee78a1b208382d3a26ec40d142ffc1ecc49ef"
"checksum opaque-debug 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "93f5bb2e8e8dec81642920ccff6b61f1eb94fa3020c5a325c9851ff604152409" "checksum opaque-debug 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "93f5bb2e8e8dec81642920ccff6b61f1eb94fa3020c5a325c9851ff604152409"
"checksum ordermap 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "a86ed3f5f244b372d6b1a00b72ef7f8876d0bc6a78a4c9985c53614041512063"
"checksum owning_ref 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "49a4b8ea2179e6a2e27411d3bca09ca6dd630821cf6894c6c7c8467a8ee7ef13" "checksum owning_ref 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "49a4b8ea2179e6a2e27411d3bca09ca6dd630821cf6894c6c7c8467a8ee7ef13"
"checksum parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "ab41b4aed082705d1056416ae4468b6ea99d52599ecf3169b00088d43113e337" "checksum parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "ab41b4aed082705d1056416ae4468b6ea99d52599ecf3169b00088d43113e337"
"checksum parking_lot_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "94c8c7923936b28d546dfd14d4472eaf34c99b14e1c973a32b3e6d4eb04298c9" "checksum parking_lot_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "94c8c7923936b28d546dfd14d4472eaf34c99b14e1c973a32b3e6d4eb04298c9"
@ -1973,6 +2092,7 @@ dependencies = [
"checksum pest_derive 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "833d1ae558dc601e9a60366421196a8d94bc0ac980476d0b67e1d0988d72b2d0" "checksum pest_derive 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "833d1ae558dc601e9a60366421196a8d94bc0ac980476d0b67e1d0988d72b2d0"
"checksum pest_generator 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "63120576c4efd69615b5537d3d052257328a4ca82876771d6944424ccfd9f646" "checksum pest_generator 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "63120576c4efd69615b5537d3d052257328a4ca82876771d6944424ccfd9f646"
"checksum pest_meta 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f249ea6de7c7b7aba92b4ff4376a994c6dbd98fd2166c89d5c4947397ecb574d" "checksum pest_meta 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f249ea6de7c7b7aba92b4ff4376a994c6dbd98fd2166c89d5c4947397ecb574d"
"checksum petgraph 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)" = "9c3659d1ee90221741f65dd128d9998311b0e40c5d3c23a62445938214abce4f"
"checksum proc-macro2 0.4.28 (registry+https://github.com/rust-lang/crates.io-index)" = "ba92c84f814b3f9a44c5cfca7d2ad77fa10710867d2bbb1b3d175ab5f47daa12" "checksum proc-macro2 0.4.28 (registry+https://github.com/rust-lang/crates.io-index)" = "ba92c84f814b3f9a44c5cfca7d2ad77fa10710867d2bbb1b3d175ab5f47daa12"
"checksum proptest 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)" = "24f5844db2f839e97e3021980975f6ebf8691d9b9b2ca67ed3feb38dc3edb52c" "checksum proptest 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)" = "24f5844db2f839e97e3021980975f6ebf8691d9b9b2ca67ed3feb38dc3edb52c"
"checksum quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9274b940887ce9addde99c4eee6b5c44cc494b182b97e73dc8ffdcb3397fd3f0" "checksum quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9274b940887ce9addde99c4eee6b5c44cc494b182b97e73dc8ffdcb3397fd3f0"
@ -2019,6 +2139,7 @@ dependencies = [
"checksum smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)" = "c4488ae950c49d403731982257768f48fada354a5203fe81f9bb6f43ca9002be" "checksum smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)" = "c4488ae950c49d403731982257768f48fada354a5203fe81f9bb6f43ca9002be"
"checksum smol_str 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "d077b3367211e9c6e2e012fb804c444e0d80ab5a51ae4137739b58e6446dcaef" "checksum smol_str 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "d077b3367211e9c6e2e012fb804c444e0d80ab5a51ae4137739b58e6446dcaef"
"checksum stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dba1a27d3efae4351c8051072d619e3ade2820635c3958d826bfea39d59b54c8" "checksum stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dba1a27d3efae4351c8051072d619e3ade2820635c3958d826bfea39d59b54c8"
"checksum stacker 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "fb79482f57cf598af52094ec4cc3b3c42499d3ce5bd426f2ac41515b7e57404b"
"checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a" "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
"checksum superslice 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ab16ced94dbd8a46c82fd81e3ed9a8727dac2977ea869d217bcc4ea1f122e81f" "checksum superslice 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ab16ced94dbd8a46c82fd81e3ed9a8727dac2977ea869d217bcc4ea1f122e81f"
"checksum syn 0.15.32 (registry+https://github.com/rust-lang/crates.io-index)" = "846620ec526c1599c070eff393bfeeeb88a93afa2513fc3b49f1fea84cf7b0ed" "checksum syn 0.15.32 (registry+https://github.com/rust-lang/crates.io-index)" = "846620ec526c1599c070eff393bfeeeb88a93afa2513fc3b49f1fea84cf7b0ed"

View file

@ -19,7 +19,14 @@ ra_db = { path = "../ra_db" }
mbe = { path = "../ra_mbe", package = "ra_mbe" } mbe = { path = "../ra_mbe", package = "ra_mbe" }
tt = { path = "../ra_tt", package = "ra_tt" } tt = { path = "../ra_tt", package = "ra_tt" }
test_utils = { path = "../test_utils" } test_utils = { path = "../test_utils" }
ra_prof = {path = "../ra_prof" } ra_prof = { path = "../ra_prof" }
# chalk-solve = { git = "https://github.com/rust-lang/chalk.git" }
# chalk-rust-ir = { git = "https://github.com/rust-lang/chalk.git" }
# chalk-ir = { git = "https://github.com/rust-lang/chalk.git" }
chalk-solve = { git = "https://github.com/detrumi/chalk.git", branch = "program_clauses_that_could_match" }
chalk-rust-ir = { git = "https://github.com/detrumi/chalk.git", branch = "program_clauses_that_could_match" }
chalk-ir = { git = "https://github.com/detrumi/chalk.git", branch = "program_clauses_that_could_match" }
[dev-dependencies] [dev-dependencies]
flexi_logger = "0.11.0" flexi_logger = "0.11.0"

View file

@ -9,7 +9,7 @@ use crate::{
type_ref::TypeRef, type_ref::TypeRef,
nameres::{ModuleScope, Namespace, ImportId, CrateModuleId}, nameres::{ModuleScope, Namespace, ImportId, CrateModuleId},
expr::{Body, BodySourceMap}, expr::{Body, BodySourceMap},
ty::InferenceResult, ty::{ TraitRef, InferenceResult},
adt::{EnumVariantId, StructFieldId, VariantDef}, adt::{EnumVariantId, StructFieldId, VariantDef},
generics::HasGenericParams, generics::HasGenericParams,
docs::{Documentation, Docs, docs_from_ast}, docs::{Documentation, Docs, docs_from_ast},
@ -696,6 +696,10 @@ impl Trait {
db.trait_data(self) db.trait_data(self)
} }
pub fn trait_ref(self, db: &impl HirDatabase) -> TraitRef {
TraitRef::for_trait(db, self)
}
pub(crate) fn resolver(&self, db: &impl DefDatabase) -> Resolver { pub(crate) fn resolver(&self, db: &impl DefDatabase) -> Resolver {
let r = self.module(db).resolver(db); let r = self.module(db).resolver(db);
// add generic params, if present // add generic params, if present

View file

@ -1,4 +1,4 @@
use std::sync::Arc; use std::sync::{Arc, Mutex};
use ra_syntax::{SyntaxNode, TreeArc, SourceFile, SmolStr, ast}; use ra_syntax::{SyntaxNode, TreeArc, SourceFile, SmolStr, ast};
use ra_db::{SourceDatabase, salsa}; use ra_db::{SourceDatabase, salsa};
@ -8,16 +8,16 @@ use crate::{
Function, FnSignature, ExprScopes, TypeAlias, Function, FnSignature, ExprScopes, TypeAlias,
Struct, Enum, StructField, Struct, Enum, StructField,
Const, ConstSignature, Static, Const, ConstSignature, Static,
DefWithBody, DefWithBody, Trait,
ids,
nameres::{Namespace, ImportSourceMap, RawItems, CrateDefMap}, nameres::{Namespace, ImportSourceMap, RawItems, CrateDefMap},
ty::{InferenceResult, Ty, method_resolution::CrateImplBlocks, TypableDef, CallableDef, FnSig}, ty::{InferenceResult, Ty, method_resolution::CrateImplBlocks, TypableDef, CallableDef, FnSig, TypeCtor},
adt::{StructData, EnumData}, adt::{StructData, EnumData},
impl_block::{ModuleImplBlocks, ImplSourceMap}, impl_block::{ModuleImplBlocks, ImplSourceMap, ImplBlock},
generics::{GenericParams, GenericDef}, generics::{GenericParams, GenericDef},
type_ref::TypeRef, type_ref::TypeRef,
traits::TraitData, Trait, ty::TraitRef, traits::TraitData,
lang_item::{LangItems, LangItemTarget}, lang_item::{LangItems, LangItemTarget},
ids
}; };
#[salsa::query_group(DefDatabaseStorage)] #[salsa::query_group(DefDatabaseStorage)]
@ -39,6 +39,12 @@ pub trait DefDatabase: SourceDatabase {
#[salsa::interned] #[salsa::interned]
fn intern_type_alias(&self, loc: ids::ItemLoc<ast::TypeAliasDef>) -> ids::TypeAliasId; fn intern_type_alias(&self, loc: ids::ItemLoc<ast::TypeAliasDef>) -> ids::TypeAliasId;
// Interned IDs for Chalk integration
#[salsa::interned]
fn intern_type_ctor(&self, type_ctor: TypeCtor) -> ids::TypeCtorId;
#[salsa::interned]
fn intern_impl_block(&self, impl_block: ImplBlock) -> ids::GlobalImplId;
#[salsa::invoke(crate::ids::macro_def_query)] #[salsa::invoke(crate::ids::macro_def_query)]
fn macro_def(&self, macro_id: MacroDefId) -> Option<Arc<mbe::MacroRules>>; fn macro_def(&self, macro_id: MacroDefId) -> Option<Arc<mbe::MacroRules>>;
@ -144,8 +150,12 @@ pub trait HirDatabase: DefDatabase {
#[salsa::invoke(crate::ty::method_resolution::CrateImplBlocks::impls_in_crate_query)] #[salsa::invoke(crate::ty::method_resolution::CrateImplBlocks::impls_in_crate_query)]
fn impls_in_crate(&self, krate: Crate) -> Arc<CrateImplBlocks>; fn impls_in_crate(&self, krate: Crate) -> Arc<CrateImplBlocks>;
#[salsa::invoke(crate::ty::traits::implements)] #[salsa::invoke(crate::ty::traits::impls_for_trait)]
fn implements(&self, trait_ref: TraitRef) -> Option<crate::ty::traits::Solution>; fn impls_for_trait(&self, krate: Crate, trait_: Trait) -> Arc<[ImplBlock]>;
#[salsa::invoke(crate::ty::traits::solver)]
#[salsa::volatile]
fn chalk_solver(&self, krate: Crate) -> Arc<Mutex<chalk_solve::Solver>>;
} }
#[test] #[test]

View file

@ -9,7 +9,7 @@ use ra_syntax::ast::{self, NameOwner, TypeParamsOwner, TypeBoundsOwner};
use crate::{ use crate::{
db::DefDatabase, db::DefDatabase,
Name, AsName, Function, Struct, Enum, Trait, TypeAlias, ImplBlock, Container, path::Path, type_ref::TypeRef Name, AsName, Function, Struct, Enum, Trait, TypeAlias, ImplBlock, Container, path::Path, type_ref::TypeRef, AdtDef
}; };
/// Data about a generic parameter (to a function, struct, impl, ...). /// Data about a generic parameter (to a function, struct, impl, ...).
@ -157,6 +157,15 @@ impl From<Container> for GenericDef {
} }
} }
impl From<crate::adt::AdtDef> for GenericDef {
fn from(adt: crate::adt::AdtDef) -> Self {
match adt {
AdtDef::Struct(s) => s.into(),
AdtDef::Enum(e) => e.into(),
}
}
}
pub trait HasGenericParams { pub trait HasGenericParams {
fn generic_params(self, db: &impl DefDatabase) -> Arc<GenericParams>; fn generic_params(self, db: &impl DefDatabase) -> Arc<GenericParams>;
} }

View file

@ -323,6 +323,25 @@ impl AstItemDef<ast::TraitDef> for TraitId {
} }
} }
fn from_chalk<T: salsa::InternKey>(chalk_id: chalk_ir::RawId) -> T {
T::from_intern_id(salsa::InternId::from(chalk_id.index))
}
fn to_chalk<T: salsa::InternKey>(salsa_id: T) -> chalk_ir::RawId {
chalk_ir::RawId { index: salsa_id.as_intern_id().as_u32() }
}
impl From<chalk_ir::TraitId> for TraitId {
fn from(trait_id: chalk_ir::TraitId) -> Self {
from_chalk(trait_id.0)
}
}
impl From<TraitId> for chalk_ir::TraitId {
fn from(trait_id: TraitId) -> Self {
chalk_ir::TraitId(to_chalk(trait_id))
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)] #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct TypeAliasId(salsa::InternId); pub struct TypeAliasId(salsa::InternId);
impl_intern_key!(TypeAliasId); impl_intern_key!(TypeAliasId);
@ -354,3 +373,38 @@ impl MacroCallId {
) )
} }
} }
/// This exists just for chalk, because chalk doesn't differentiate between
/// enums and structs.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct TypeCtorId(salsa::InternId);
impl_intern_key!(TypeCtorId);
impl From<chalk_ir::StructId> for TypeCtorId {
fn from(struct_id: chalk_ir::StructId) -> Self {
from_chalk(struct_id.0)
}
}
impl From<TypeCtorId> for chalk_ir::StructId {
fn from(adt_id: TypeCtorId) -> Self {
chalk_ir::StructId(to_chalk(adt_id))
}
}
/// This exists just for chalk, because our ImplIds are only unique per module.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct GlobalImplId(salsa::InternId);
impl_intern_key!(GlobalImplId);
impl From<chalk_ir::ImplId> for GlobalImplId {
fn from(impl_id: chalk_ir::ImplId) -> Self {
from_chalk(impl_id.0)
}
}
impl From<GlobalImplId> for chalk_ir::ImplId {
fn from(impl_id: GlobalImplId) -> Self {
chalk_ir::ImplId(to_chalk(impl_id))
}
}

View file

@ -6,7 +6,7 @@ use ra_syntax::ast;
use rustc_hash::FxHashMap; use rustc_hash::FxHashMap;
use crate::{ use crate::{
ModuleDef, ModuleDef, Trait,
code_model_api::Crate, code_model_api::Crate,
MacroCallId, MacroCallId,
MacroCallLoc, MacroCallLoc,
@ -18,7 +18,6 @@ use crate::{
expr::{scope::{ExprScopes, ScopeId}, PatId}, expr::{scope::{ExprScopes, ScopeId}, PatId},
impl_block::ImplBlock, impl_block::ImplBlock,
path::Path, path::Path,
Trait,
}; };
#[derive(Debug, Clone, Default)] #[derive(Debug, Clone, Default)]

View file

@ -15,7 +15,7 @@ pub(crate) mod display;
use std::sync::Arc; use std::sync::Arc;
use std::{fmt, mem}; use std::{fmt, mem};
use crate::{Name, AdtDef, type_ref::Mutability, db::HirDatabase, Trait}; use crate::{Name, AdtDef, type_ref::Mutability, db::HirDatabase, Trait, GenericParams};
use display::{HirDisplay, HirFormatter}; use display::{HirDisplay, HirFormatter};
pub(crate) use lower::{TypableDef, type_for_def, type_for_field, callable_item_sig}; pub(crate) use lower::{TypableDef, type_for_def, type_for_field, callable_item_sig};
@ -118,6 +118,7 @@ pub enum Ty {
/// surrounding impl, then the current function). /// surrounding impl, then the current function).
idx: u32, idx: u32,
/// The name of the parameter, for displaying. /// The name of the parameter, for displaying.
// FIXME get rid of this
name: Name, name: Name,
}, },
@ -177,6 +178,30 @@ impl Substs {
} }
&self.0[0] &self.0[0]
} }
/// Return Substs that replace each parameter by itself (i.e. `Ty::Param`).
pub fn identity(generic_params: &GenericParams) -> Substs {
Substs(
generic_params
.params_including_parent()
.into_iter()
.map(|p| Ty::Param { idx: p.idx, name: p.name.clone() })
.collect::<Vec<_>>()
.into(),
)
}
/// Return Substs that replace each parameter by a bound variable.
pub fn bound_vars(generic_params: &GenericParams) -> Substs {
Substs(
generic_params
.params_including_parent()
.into_iter()
.map(|p| Ty::Bound(p.idx))
.collect::<Vec<_>>()
.into(),
)
}
} }
impl From<Vec<Ty>> for Substs { impl From<Vec<Ty>> for Substs {
@ -198,6 +223,14 @@ impl TraitRef {
pub fn self_ty(&self) -> &Ty { pub fn self_ty(&self) -> &Ty {
&self.substs.0[0] &self.substs.0[0]
} }
pub fn subst(mut self, substs: &Substs) -> TraitRef {
self.substs.walk_mut(&mut |ty_mut| {
let ty = mem::replace(ty_mut, Ty::Unknown);
*ty_mut = ty.subst(substs);
});
self
}
} }
/// A function signature as seen by type inference: Several parameter types and /// A function signature as seen by type inference: Several parameter types and
@ -376,6 +409,20 @@ impl Ty {
}) })
} }
/// Substitutes `Ty::Bound` vars (as opposed to type parameters).
pub fn subst_bound_vars(self, substs: &Substs) -> Ty {
self.fold(&mut |ty| match ty {
Ty::Bound(idx) => {
if (idx as usize) < substs.0.len() {
substs.0[idx as usize].clone()
} else {
Ty::Bound(idx)
}
}
ty => ty,
})
}
/// Returns the type parameters of this type if it has some (i.e. is an ADT /// Returns the type parameters of this type if it has some (i.e. is an ADT
/// or function); so if `self` is `Option<u32>`, this returns the `u32`. /// or function); so if `self` is `Option<u32>`, this returns the `u32`.
fn substs(&self) -> Option<Substs> { fn substs(&self) -> Option<Substs> {

View file

@ -44,9 +44,13 @@ use crate::{
}; };
use super::{ use super::{
Ty, TypableDef, Substs, primitive, op, ApplicationTy, TypeCtor, CallableDef, TraitRef, Ty, TypableDef, Substs, primitive, op, ApplicationTy, TypeCtor, CallableDef, TraitRef,
traits::{ Solution, Obligation, Guidance}, traits::{Solution, Obligation, Guidance},
}; };
mod unify;
pub(super) use unify::Canonical;
/// The entry point of type inference. /// The entry point of type inference.
pub fn infer(db: &impl HirDatabase, def: DefWithBody) -> Arc<InferenceResult> { pub fn infer(db: &impl HirDatabase, def: DefWithBody) -> Arc<InferenceResult> {
db.check_canceled(); db.check_canceled();
@ -321,30 +325,27 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
fn resolve_obligations_as_possible(&mut self) { fn resolve_obligations_as_possible(&mut self) {
let obligations = mem::replace(&mut self.obligations, Vec::new()); let obligations = mem::replace(&mut self.obligations, Vec::new());
for obligation in obligations { for obligation in obligations {
// FIXME resolve types in the obligation first let mut canonicalizer = self.canonicalizer();
let (solution, var_mapping) = match &obligation { let solution = match &obligation {
Obligation::Trait(tr) => { Obligation::Trait(tr) => {
let (tr, var_mapping) = super::traits::canonicalize(tr.clone()); let canonical = canonicalizer.canonicalize_trait_ref(tr.clone());
(self.db.implements(tr), var_mapping) super::traits::implements(
canonicalizer.ctx.db,
canonicalizer.ctx.resolver.krate().unwrap(),
canonical,
)
} }
}; };
match solution { match solution {
Some(Solution::Unique(substs)) => { Some(Solution::Unique(substs)) => {
for (i, subst) in substs.0.iter().enumerate() { canonicalizer.apply_solution(substs.0);
let uncanonical = var_mapping[i];
// FIXME the subst may contain type variables, which would need to be mapped back as well
self.unify(&Ty::Infer(InferTy::TypeVar(uncanonical)), subst);
}
} }
Some(Solution::Ambig(Guidance::Definite(substs))) => { Some(Solution::Ambig(Guidance::Definite(substs))) => {
for (i, subst) in substs.0.iter().enumerate() { canonicalizer.apply_solution(substs.0);
let uncanonical = var_mapping[i];
// FIXME the subst may contain type variables, which would need to be mapped back as well
self.unify(&Ty::Infer(InferTy::TypeVar(uncanonical)), subst);
}
self.obligations.push(obligation); self.obligations.push(obligation);
} }
Some(_) => { Some(_) => {
// FIXME use this when trying to resolve everything at the end
self.obligations.push(obligation); self.obligations.push(obligation);
} }
None => { None => {

View file

@ -0,0 +1,81 @@
//! Unification and canonicalization logic.
use super::{InferenceContext, Ty, TraitRef, InferTy, HirDatabase};
impl<'a, D: HirDatabase> InferenceContext<'a, D> {
pub(super) fn canonicalizer<'b>(&'b mut self) -> Canonicalizer<'a, 'b, D>
where
'a: 'b,
{
Canonicalizer { ctx: self, free_vars: Vec::new() }
}
}
// TODO improve the interface of this
// TODO move further up?
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub(crate) struct Canonical<T> {
pub value: T,
pub num_vars: usize,
}
pub(super) struct Canonicalizer<'a, 'b, D: HirDatabase>
where
'a: 'b,
{
pub ctx: &'b mut InferenceContext<'a, D>,
pub free_vars: Vec<InferTy>,
}
impl<'a, 'b, D: HirDatabase> Canonicalizer<'a, 'b, D>
where
'a: 'b,
{
fn add(&mut self, free_var: InferTy) -> usize {
self.free_vars.iter().position(|&v| v == free_var).unwrap_or_else(|| {
let next_index = self.free_vars.len();
self.free_vars.push(free_var);
next_index
})
}
pub fn canonicalize_ty(&mut self, ty: Ty) -> Canonical<Ty> {
let value = ty.fold(&mut |ty| match ty {
Ty::Infer(tv) => {
let inner = tv.to_inner();
// TODO prevent infinite loops? => keep var stack
if let Some(known_ty) = self.ctx.var_unification_table.probe_value(inner).known() {
self.canonicalize_ty(known_ty.clone()).value
} else {
let free_var = InferTy::TypeVar(self.ctx.var_unification_table.find(inner));
let position = self.add(free_var);
Ty::Bound(position as u32)
}
}
_ => ty,
});
Canonical { value, num_vars: self.free_vars.len() }
}
pub fn canonicalize_trait_ref(&mut self, trait_ref: TraitRef) -> Canonical<TraitRef> {
let substs = trait_ref
.substs
.0
.iter()
.map(|ty| self.canonicalize_ty(ty.clone()).value)
.collect::<Vec<_>>();
let value = TraitRef { trait_: trait_ref.trait_, substs: substs.into() };
Canonical { value, num_vars: self.free_vars.len() }
}
pub fn apply_solution(&mut self, solution: Canonical<Vec<Ty>>) {
// the solution may contain new variables, which we need to convert to new inference vars
let new_vars =
(0..solution.num_vars).map(|_| self.ctx.new_type_var()).collect::<Vec<_>>().into();
for (i, ty) in solution.value.into_iter().enumerate() {
let var = self.free_vars[i].clone();
self.ctx.unify(&Ty::Infer(var), &ty.subst_bound_vars(&new_vars));
}
}
}

View file

@ -238,6 +238,11 @@ impl TraitRef {
let segment = path.segments.last().expect("path should have at least one segment"); let segment = path.segments.last().expect("path should have at least one segment");
substs_from_path_segment(db, resolver, segment, &resolved.generic_params(db), true) substs_from_path_segment(db, resolver, segment, &resolved.generic_params(db), true)
} }
pub(crate) fn for_trait(db: &impl HirDatabase, trait_: Trait) -> TraitRef {
let substs = Substs::identity(&trait_.generic_params(db));
TraitRef { trait_, substs }
}
} }
/// Build the declared type of an item. This depends on the namespace; e.g. for /// Build the declared type of an item. This depends on the namespace; e.g. for
@ -299,7 +304,7 @@ fn fn_sig_for_fn(db: &impl HirDatabase, def: Function) -> FnSig {
/// function body. /// function body.
fn type_for_fn(db: &impl HirDatabase, def: Function) -> Ty { fn type_for_fn(db: &impl HirDatabase, def: Function) -> Ty {
let generics = def.generic_params(db); let generics = def.generic_params(db);
let substs = make_substs(&generics); let substs = Substs::identity(&generics);
Ty::apply(TypeCtor::FnDef(def.into()), substs) Ty::apply(TypeCtor::FnDef(def.into()), substs)
} }
@ -341,7 +346,7 @@ fn type_for_struct_constructor(db: &impl HirDatabase, def: Struct) -> Ty {
return type_for_struct(db, def); // Unit struct return type_for_struct(db, def); // Unit struct
} }
let generics = def.generic_params(db); let generics = def.generic_params(db);
let substs = make_substs(&generics); let substs = Substs::identity(&generics);
Ty::apply(TypeCtor::FnDef(def.into()), substs) Ty::apply(TypeCtor::FnDef(def.into()), substs)
} }
@ -357,7 +362,7 @@ fn fn_sig_for_enum_variant_constructor(db: &impl HirDatabase, def: EnumVariant)
.map(|(_, field)| Ty::from_hir(db, &resolver, &field.type_ref)) .map(|(_, field)| Ty::from_hir(db, &resolver, &field.type_ref))
.collect::<Vec<_>>(); .collect::<Vec<_>>();
let generics = def.parent_enum(db).generic_params(db); let generics = def.parent_enum(db).generic_params(db);
let substs = make_substs(&generics); let substs = Substs::identity(&generics);
let ret = type_for_enum(db, def.parent_enum(db)).subst(&substs); let ret = type_for_enum(db, def.parent_enum(db)).subst(&substs);
FnSig::from_params_and_return(params, ret) FnSig::from_params_and_return(params, ret)
} }
@ -369,36 +374,25 @@ fn type_for_enum_variant_constructor(db: &impl HirDatabase, def: EnumVariant) ->
return type_for_enum(db, def.parent_enum(db)); // Unit variant return type_for_enum(db, def.parent_enum(db)); // Unit variant
} }
let generics = def.parent_enum(db).generic_params(db); let generics = def.parent_enum(db).generic_params(db);
let substs = make_substs(&generics); let substs = Substs::identity(&generics);
Ty::apply(TypeCtor::FnDef(def.into()), substs) Ty::apply(TypeCtor::FnDef(def.into()), substs)
} }
fn make_substs(generics: &GenericParams) -> Substs {
Substs(
generics
.params_including_parent()
.into_iter()
.map(|p| Ty::Param { idx: p.idx, name: p.name.clone() })
.collect::<Vec<_>>()
.into(),
)
}
fn type_for_struct(db: &impl HirDatabase, s: Struct) -> Ty { fn type_for_struct(db: &impl HirDatabase, s: Struct) -> Ty {
let generics = s.generic_params(db); let generics = s.generic_params(db);
Ty::apply(TypeCtor::Adt(s.into()), make_substs(&generics)) Ty::apply(TypeCtor::Adt(s.into()), Substs::identity(&generics))
} }
fn type_for_enum(db: &impl HirDatabase, s: Enum) -> Ty { fn type_for_enum(db: &impl HirDatabase, s: Enum) -> Ty {
let generics = s.generic_params(db); let generics = s.generic_params(db);
Ty::apply(TypeCtor::Adt(s.into()), make_substs(&generics)) Ty::apply(TypeCtor::Adt(s.into()), Substs::identity(&generics))
} }
fn type_for_type_alias(db: &impl HirDatabase, t: TypeAlias) -> Ty { fn type_for_type_alias(db: &impl HirDatabase, t: TypeAlias) -> Ty {
let generics = t.generic_params(db); let generics = t.generic_params(db);
let resolver = t.resolver(db); let resolver = t.resolver(db);
let type_ref = t.type_ref(db); let type_ref = t.type_ref(db);
let substs = make_substs(&generics); let substs = Substs::identity(&generics);
let inner = Ty::from_hir(db, &resolver, &type_ref); let inner = Ty::from_hir(db, &resolver, &type_ref);
inner.subst(&substs) inner.subst(&substs)
} }

View file

@ -16,7 +16,7 @@ use crate::{
generics::HasGenericParams, generics::HasGenericParams,
ty::primitive::{UncertainIntTy, UncertainFloatTy} ty::primitive::{UncertainIntTy, UncertainFloatTy}
}; };
use super::{TraitRef, Substs}; use super::{TraitRef, infer::Canonical, Substs};
/// This is used as a key for indexing impls. /// This is used as a key for indexing impls.
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)] #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
@ -183,6 +183,7 @@ impl Ty {
name: Option<&Name>, name: Option<&Name>,
mut callback: impl FnMut(&Ty, Function) -> Option<T>, mut callback: impl FnMut(&Ty, Function) -> Option<T>,
) -> Option<T> { ) -> Option<T> {
let krate = resolver.krate()?;
'traits: for t in resolver.traits_in_scope() { 'traits: for t in resolver.traits_in_scope() {
let data = t.trait_data(db); let data = t.trait_data(db);
// we'll be lazy about checking whether the type implements the // we'll be lazy about checking whether the type implements the
@ -195,12 +196,19 @@ impl Ty {
let sig = m.signature(db); let sig = m.signature(db);
if name.map_or(true, |name| sig.name() == name) && sig.has_self_param() { if name.map_or(true, |name| sig.name() == name) && sig.has_self_param() {
if !known_implemented { if !known_implemented {
// TODO the self type may contain type
// variables, so we need to do proper
// canonicalization here
let trait_ref = TraitRef { let trait_ref = TraitRef {
trait_: t, trait_: t,
substs: fresh_substs_for_trait(db, t, self.clone()), substs: fresh_substs_for_trait(db, t, self.clone()),
}; };
let (trait_ref, _) = super::traits::canonicalize(trait_ref); let canonical = Canonical {
if db.implements(trait_ref).is_none() { num_vars: trait_ref.substs.len(),
value: trait_ref,
};
// FIXME cache this implements check (without solution) in a query?
if super::traits::implements(db, krate, canonical).is_none() {
continue 'traits; continue 'traits;
} }
} }
@ -271,15 +279,18 @@ impl Ty {
} }
/// This creates Substs for a trait with the given Self type and type variables /// This creates Substs for a trait with the given Self type and type variables
/// for all other parameters. This is kind of a hack since these aren't 'real' /// for all other parameters, to query Chalk with it.
/// type variables; the resulting trait reference is just used for the
/// preliminary method candidate check.
fn fresh_substs_for_trait(db: &impl HirDatabase, tr: Trait, self_ty: Ty) -> Substs { fn fresh_substs_for_trait(db: &impl HirDatabase, tr: Trait, self_ty: Ty) -> Substs {
let mut substs = Vec::new(); let mut substs = Vec::new();
let generics = tr.generic_params(db); let generics = tr.generic_params(db);
substs.push(self_ty); substs.push(self_ty);
substs.extend(generics.params_including_parent().into_iter().skip(1).enumerate().map( substs.extend(
|(i, _p)| Ty::Infer(super::infer::InferTy::TypeVar(super::infer::TypeVarId(i as u32))), generics
)); .params_including_parent()
.into_iter()
.skip(1)
.enumerate()
.map(|(i, _p)| Ty::Bound(i as u32)),
);
substs.into() substs.into()
} }

View file

@ -2140,7 +2140,7 @@ fn test() {
[102; 127) '{ ...d(); }': () [102; 127) '{ ...d(); }': ()
[108; 109) 'S': S<u32>(T) -> S<T> [108; 109) 'S': S<u32>(T) -> S<T>
[108; 115) 'S(1u32)': S<u32> [108; 115) 'S(1u32)': S<u32>
[108; 124) 'S(1u32...thod()': {unknown} [108; 124) 'S(1u32...thod()': u32
[110; 114) '1u32': u32"### [110; 114) '1u32': u32"###
); );
} }

View file

@ -1,47 +1,329 @@
//! Stuff that will probably mostly replaced by Chalk. //! Chalk integration.
use std::collections::HashMap; use std::sync::{Arc, Mutex};
use crate::{db::HirDatabase, generics::HasGenericParams}; use chalk_ir::{TypeId, TraitId, StructId, ImplId, TypeKindId, ProjectionTy, Parameter, Identifier, cast::Cast};
use super::{TraitRef, Substs, infer::{TypeVarId, InferTy}, Ty}; use chalk_rust_ir::{AssociatedTyDatum, TraitDatum, StructDatum, ImplDatum};
// Copied (and simplified) from Chalk use crate::{Crate, Trait, db::HirDatabase, HasGenericParams, ImplBlock};
use super::{TraitRef, Ty, ApplicationTy, TypeCtor, Substs, infer::Canonical};
#[derive(Clone, Debug, PartialEq, Eq)] #[derive(Debug, Copy, Clone)]
/// A (possible) solution for a proposed goal. Usually packaged in a `Result`, struct ChalkContext<'a, DB> {
/// where `Err` represents definite *failure* to prove a goal. db: &'a DB,
pub enum Solution { krate: Crate,
/// The goal indeed holds, and there is a unique value for all existential
/// variables.
Unique(Substs),
/// The goal may be provable in multiple ways, but regardless we may have some guidance
/// for type inference.
Ambig(Guidance),
} }
#[derive(Clone, Debug, PartialEq, Eq)] pub(crate) trait ToChalk {
/// When a goal holds ambiguously (e.g., because there are multiple possible type Chalk;
/// solutions), we issue a set of *guidance* back to type inference. fn to_chalk(self, db: &impl HirDatabase) -> Self::Chalk;
pub enum Guidance { fn from_chalk(db: &impl HirDatabase, chalk: Self::Chalk) -> Self;
/// The existential variables *must* have the given values if the goal is }
/// ever to hold, but that alone isn't enough to guarantee the goal will
/// actually hold.
Definite(Substs),
/// There are multiple plausible values for the existentials, but the ones pub(crate) fn from_chalk<T, ChalkT>(db: &impl HirDatabase, chalk: ChalkT) -> T
/// here are suggested as the preferred choice heuristically. These should where
/// be used for inference fallback only. T: ToChalk<Chalk = ChalkT>,
Suggested(Substs), {
T::from_chalk(db, chalk)
}
/// There's no useful information to feed back to type inference impl ToChalk for Ty {
Unknown, type Chalk = chalk_ir::Ty;
fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::Ty {
match self {
Ty::Apply(apply_ty) => chalk_ir::Ty::Apply(apply_ty.to_chalk(db)),
Ty::Param { idx, .. } => {
chalk_ir::PlaceholderIndex { ui: chalk_ir::UniverseIndex::ROOT, idx: idx as usize }
.to_ty()
}
Ty::Bound(idx) => chalk_ir::Ty::BoundVar(idx as usize),
Ty::Infer(_infer_ty) => panic!("uncanonicalized infer ty"),
Ty::Unknown => unimplemented!(), // TODO turn into placeholder?
}
}
fn from_chalk(db: &impl HirDatabase, chalk: chalk_ir::Ty) -> Self {
match chalk {
chalk_ir::Ty::Apply(apply_ty) => {
match apply_ty.name {
// FIXME handle TypeKindId::Trait/Type here
chalk_ir::TypeName::TypeKindId(_) => Ty::Apply(from_chalk(db, apply_ty)),
chalk_ir::TypeName::AssociatedType(_) => unimplemented!(),
chalk_ir::TypeName::Placeholder(idx) => {
assert_eq!(idx.ui, chalk_ir::UniverseIndex::ROOT);
Ty::Param { idx: idx.idx as u32, name: crate::Name::missing() }
}
}
}
chalk_ir::Ty::Projection(_) => unimplemented!(),
chalk_ir::Ty::UnselectedProjection(_) => unimplemented!(),
chalk_ir::Ty::ForAll(_) => unimplemented!(),
chalk_ir::Ty::BoundVar(idx) => Ty::Bound(idx as u32),
chalk_ir::Ty::InferenceVar(_iv) => panic!("unexpected chalk infer ty"),
}
}
}
impl ToChalk for ApplicationTy {
type Chalk = chalk_ir::ApplicationTy;
fn to_chalk(self: ApplicationTy, db: &impl HirDatabase) -> chalk_ir::ApplicationTy {
let struct_id = self.ctor.to_chalk(db);
let name = chalk_ir::TypeName::TypeKindId(struct_id.into());
let parameters = self.parameters.to_chalk(db);
chalk_ir::ApplicationTy { name, parameters }
}
fn from_chalk(db: &impl HirDatabase, apply_ty: chalk_ir::ApplicationTy) -> ApplicationTy {
let ctor = match apply_ty.name {
chalk_ir::TypeName::TypeKindId(chalk_ir::TypeKindId::StructId(struct_id)) => {
from_chalk(db, struct_id)
}
chalk_ir::TypeName::TypeKindId(_) => unimplemented!(),
chalk_ir::TypeName::Placeholder(_) => unimplemented!(),
chalk_ir::TypeName::AssociatedType(_) => unimplemented!(),
};
let parameters = from_chalk(db, apply_ty.parameters);
ApplicationTy { ctor, parameters }
}
}
impl ToChalk for Substs {
type Chalk = Vec<chalk_ir::Parameter>;
fn to_chalk(self, db: &impl HirDatabase) -> Vec<chalk_ir::Parameter> {
self.iter().map(|ty| ty.clone().to_chalk(db).cast()).collect()
}
fn from_chalk(db: &impl HirDatabase, parameters: Vec<chalk_ir::Parameter>) -> Substs {
parameters
.into_iter()
.map(|p| match p {
chalk_ir::Parameter(chalk_ir::ParameterKind::Ty(ty)) => from_chalk(db, ty),
chalk_ir::Parameter(chalk_ir::ParameterKind::Lifetime(_)) => unimplemented!(),
})
.collect::<Vec<_>>()
.into()
}
}
impl ToChalk for TraitRef {
type Chalk = chalk_ir::TraitRef;
fn to_chalk(self: TraitRef, db: &impl HirDatabase) -> chalk_ir::TraitRef {
let trait_id = self.trait_.to_chalk(db);
let parameters = self.substs.to_chalk(db);
chalk_ir::TraitRef { trait_id, parameters }
}
fn from_chalk(db: &impl HirDatabase, trait_ref: chalk_ir::TraitRef) -> Self {
let trait_ = from_chalk(db, trait_ref.trait_id);
let substs = from_chalk(db, trait_ref.parameters);
TraitRef { trait_, substs }
}
}
impl ToChalk for Trait {
type Chalk = TraitId;
fn to_chalk(self, _db: &impl HirDatabase) -> TraitId {
self.id.into()
}
fn from_chalk(_db: &impl HirDatabase, trait_id: TraitId) -> Trait {
Trait { id: trait_id.into() }
}
}
impl ToChalk for TypeCtor {
type Chalk = chalk_ir::StructId;
fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::StructId {
db.intern_type_ctor(self).into()
}
fn from_chalk(db: &impl HirDatabase, struct_id: chalk_ir::StructId) -> TypeCtor {
db.lookup_intern_type_ctor(struct_id.into())
}
}
impl ToChalk for ImplBlock {
type Chalk = chalk_ir::ImplId;
fn to_chalk(self, db: &impl HirDatabase) -> chalk_ir::ImplId {
db.intern_impl_block(self).into()
}
fn from_chalk(db: &impl HirDatabase, impl_id: chalk_ir::ImplId) -> ImplBlock {
db.lookup_intern_impl_block(impl_id.into())
}
}
fn make_binders<T>(value: T, num_vars: usize) -> chalk_ir::Binders<T> {
chalk_ir::Binders {
value,
binders: std::iter::repeat(chalk_ir::ParameterKind::Ty(())).take(num_vars).collect(),
}
}
impl<'a, DB> chalk_solve::RustIrDatabase for ChalkContext<'a, DB>
where
DB: HirDatabase,
{
fn associated_ty_data(&self, _ty: TypeId) -> Arc<AssociatedTyDatum> {
unimplemented!()
}
fn trait_datum(&self, trait_id: TraitId) -> Arc<TraitDatum> {
eprintln!("trait_datum {:?}", trait_id);
let trait_: Trait = from_chalk(self.db, trait_id);
let generic_params = trait_.generic_params(self.db);
let bound_vars = Substs::bound_vars(&generic_params);
let trait_ref = trait_.trait_ref(self.db).subst(&bound_vars).to_chalk(self.db);
let flags = chalk_rust_ir::TraitFlags {
// FIXME set these flags correctly
auto: false,
marker: false,
upstream: trait_.module(self.db).krate(self.db) != Some(self.krate),
fundamental: false,
};
let where_clauses = Vec::new(); // FIXME add where clauses
let trait_datum_bound = chalk_rust_ir::TraitDatumBound { trait_ref, where_clauses, flags };
let trait_datum = TraitDatum { binders: make_binders(trait_datum_bound, bound_vars.len()) };
Arc::new(trait_datum)
}
fn struct_datum(&self, struct_id: StructId) -> Arc<StructDatum> {
eprintln!("struct_datum {:?}", struct_id);
let type_ctor = from_chalk(self.db, struct_id);
// TODO might be nicer if we can create a fake GenericParams for the TypeCtor
let (num_params, upstream) = match type_ctor {
TypeCtor::Bool
| TypeCtor::Char
| TypeCtor::Int(_)
| TypeCtor::Float(_)
| TypeCtor::Never
| TypeCtor::Str => (0, true),
TypeCtor::Slice | TypeCtor::Array | TypeCtor::RawPtr(_) | TypeCtor::Ref(_) => (1, true),
TypeCtor::FnPtr | TypeCtor::Tuple => unimplemented!(), // FIXME tuples and FnPtr are currently variadic... we need to make the parameter number explicit
TypeCtor::FnDef(_) => unimplemented!(),
TypeCtor::Adt(adt) => {
let generic_params = adt.generic_params(self.db);
(
generic_params.count_params_including_parent(),
adt.krate(self.db) != Some(self.krate),
)
}
};
let flags = chalk_rust_ir::StructFlags {
upstream,
// FIXME set fundamental flag correctly
fundamental: false,
};
let where_clauses = Vec::new(); // FIXME add where clauses
let ty = ApplicationTy {
ctor: type_ctor,
parameters: (0..num_params).map(|i| Ty::Bound(i as u32)).collect::<Vec<_>>().into(),
};
let struct_datum_bound = chalk_rust_ir::StructDatumBound {
self_ty: ty.to_chalk(self.db),
fields: Vec::new(), // FIXME add fields (only relevant for auto traits)
where_clauses,
flags,
};
let struct_datum = StructDatum { binders: make_binders(struct_datum_bound, num_params) };
Arc::new(struct_datum)
}
fn impl_datum(&self, impl_id: ImplId) -> Arc<ImplDatum> {
eprintln!("impl_datum {:?}", impl_id);
let impl_block: ImplBlock = from_chalk(self.db, impl_id);
let generic_params = impl_block.generic_params(self.db);
let bound_vars = Substs::bound_vars(&generic_params);
let trait_ref = impl_block
.target_trait_ref(self.db)
.expect("FIXME handle unresolved impl block trait ref")
.subst(&bound_vars);
let impl_type = if impl_block.module().krate(self.db) == Some(self.krate) {
chalk_rust_ir::ImplType::Local
} else {
chalk_rust_ir::ImplType::External
};
let impl_datum_bound = chalk_rust_ir::ImplDatumBound {
// FIXME handle negative impls (impl !Sync for Foo)
trait_ref: chalk_rust_ir::PolarizedTraitRef::Positive(trait_ref.to_chalk(self.db)),
where_clauses: Vec::new(), // FIXME add where clauses
associated_ty_values: Vec::new(), // FIXME add associated type values
impl_type,
};
let impl_datum = ImplDatum { binders: make_binders(impl_datum_bound, bound_vars.len()) };
Arc::new(impl_datum)
}
fn impls_for_trait(&self, trait_id: TraitId) -> Vec<ImplId> {
eprintln!("impls_for_trait {:?}", trait_id);
let trait_ = from_chalk(self.db, trait_id);
self.db
.impls_for_trait(self.krate, trait_)
.iter()
// FIXME temporary hack -- as long as we're not lowering where clauses
// correctly, ignore impls with them completely so as to not treat
// impl<T> Trait for T where T: ... as a blanket impl on all types
.filter(|impl_block| impl_block.generic_params(self.db).where_predicates.is_empty())
.map(|impl_block| impl_block.to_chalk(self.db))
.collect()
}
fn impl_provided_for(&self, auto_trait_id: TraitId, struct_id: StructId) -> bool {
eprintln!("impl_provided_for {:?}, {:?}", auto_trait_id, struct_id);
false // FIXME
}
fn type_name(&self, _id: TypeKindId) -> Identifier {
unimplemented!()
}
fn split_projection<'p>(
&self,
projection: &'p ProjectionTy,
) -> (Arc<AssociatedTyDatum>, &'p [Parameter], &'p [Parameter]) {
eprintln!("split_projection {:?}", projection);
unimplemented!()
}
}
pub(crate) fn solver(_db: &impl HirDatabase, _krate: Crate) -> Arc<Mutex<chalk_solve::Solver>> {
// krate parameter is just so we cache a unique solver per crate
let solver_choice = chalk_solve::SolverChoice::SLG { max_size: 10 };
Arc::new(Mutex::new(solver_choice.into_solver()))
}
/// Collects impls for the given trait in the whole dependency tree of `krate`.
pub(crate) fn impls_for_trait(
db: &impl HirDatabase,
krate: Crate,
trait_: Trait,
) -> Arc<[ImplBlock]> {
let mut impls = Vec::new();
// We call the query recursively here. On the one hand, this means we can
// reuse results from queries for different crates; on the other hand, this
// will only ever get called for a few crates near the root of the tree (the
// ones the user is editing), so this may actually be a waste of memory. I'm
// doing it like this mainly for simplicity for now.
for dep in krate.dependencies(db) {
impls.extend(db.impls_for_trait(dep.krate, trait_).iter());
}
let crate_impl_blocks = db.impls_in_crate(krate);
impls.extend(crate_impl_blocks.lookup_impl_blocks_for_trait(&trait_));
impls.into()
}
fn solve(
db: &impl HirDatabase,
krate: Crate,
goal: &chalk_ir::UCanonical<chalk_ir::InEnvironment<chalk_ir::Goal>>,
) -> Option<chalk_solve::Solution> {
let context = ChalkContext { db, krate };
let solver = db.chalk_solver(krate);
let solution = solver.lock().unwrap().solve(&context, goal);
eprintln!("solve({:?}) => {:?}", goal, solution);
solution
} }
/// Something that needs to be proven (by Chalk) during type checking, e.g. that /// Something that needs to be proven (by Chalk) during type checking, e.g. that
/// a certain type implements a certain trait. Proving the Obligation might /// a certain type implements a certain trait. Proving the Obligation might
/// result in additional information about inference variables. /// result in additional information about inference variables.
///
/// This might be handled by Chalk when we integrate it?
#[derive(Clone, Debug, PartialEq, Eq)] #[derive(Clone, Debug, PartialEq, Eq)]
pub enum Obligation { pub enum Obligation {
/// Prove that a certain type implements a trait (the type is the `Self` type /// Prove that a certain type implements a trait (the type is the `Self` type
@ -49,67 +331,98 @@ pub enum Obligation {
Trait(TraitRef), Trait(TraitRef),
} }
/// Rudimentary check whether an impl exists for a given type and trait; this /// Check using Chalk whether trait is implemented for given parameters including `Self` type.
/// will actually be done by chalk. pub(crate) fn implements(
pub(crate) fn implements(db: &impl HirDatabase, trait_ref: TraitRef) -> Option<Solution> { db: &impl HirDatabase,
// FIXME use all trait impls in the whole crate graph krate: Crate,
let krate = trait_ref.trait_.module(db).krate(db); trait_ref: Canonical<TraitRef>,
let krate = match krate { ) -> Option<Solution> {
Some(krate) => krate, let goal: chalk_ir::Goal = trait_ref.value.to_chalk(db).cast();
None => return None, eprintln!("goal: {:?}", goal);
let env = chalk_ir::Environment::new();
let in_env = chalk_ir::InEnvironment::new(&env, goal);
let parameter = chalk_ir::ParameterKind::Ty(chalk_ir::UniverseIndex::ROOT);
let canonical =
chalk_ir::Canonical { value: in_env, binders: vec![parameter; trait_ref.num_vars] };
// We currently don't deal with universes (I think / hope they're not yet
// relevant for our use cases?)
let u_canonical = chalk_ir::UCanonical { canonical, universes: 1 };
let solution = solve(db, krate, &u_canonical);
solution_from_chalk(db, solution)
}
fn solution_from_chalk(
db: &impl HirDatabase,
solution: Option<chalk_solve::Solution>,
) -> Option<Solution> {
let convert_subst = |subst: chalk_ir::Canonical<chalk_ir::Substitution>| {
let value = subst
.value
.parameters
.into_iter()
.map(|p| {
let ty = match p {
chalk_ir::Parameter(chalk_ir::ParameterKind::Ty(ty)) => from_chalk(db, ty),
chalk_ir::Parameter(chalk_ir::ParameterKind::Lifetime(_)) => unimplemented!(),
}; };
let crate_impl_blocks = db.impls_in_crate(krate); ty
let mut impl_blocks = crate_impl_blocks })
.lookup_impl_blocks_for_trait(&trait_ref.trait_) .collect();
// we don't handle where clauses at all, waiting for Chalk for that let result = Canonical { value, num_vars: subst.binders.len() };
.filter(|impl_block| impl_block.generic_params(db).where_predicates.is_empty()); SolutionVariables(result)
impl_blocks };
.find_map(|impl_block| unify_trait_refs(&trait_ref, &impl_block.target_trait_ref(db)?)) match solution {
Some(chalk_solve::Solution::Unique(constr_subst)) => {
let subst = chalk_ir::Canonical {
value: constr_subst.value.subst,
binders: constr_subst.binders,
};
Some(Solution::Unique(convert_subst(subst)))
}
Some(chalk_solve::Solution::Ambig(chalk_solve::Guidance::Definite(subst))) => {
Some(Solution::Ambig(Guidance::Definite(convert_subst(subst))))
}
Some(chalk_solve::Solution::Ambig(chalk_solve::Guidance::Suggested(subst))) => {
Some(Solution::Ambig(Guidance::Suggested(convert_subst(subst))))
}
Some(chalk_solve::Solution::Ambig(chalk_solve::Guidance::Unknown)) => {
Some(Solution::Ambig(Guidance::Unknown))
}
None => None,
}
} }
pub(super) fn canonicalize(trait_ref: TraitRef) -> (TraitRef, Vec<TypeVarId>) { #[derive(Clone, Debug, PartialEq, Eq)]
let mut canonical = HashMap::new(); // mapping uncanonical -> canonical pub(crate) struct SolutionVariables(pub Canonical<Vec<Ty>>);
let mut uncanonical = Vec::new(); // mapping canonical -> uncanonical (which is dense)
let mut substs = trait_ref.substs.0.to_vec(); #[derive(Clone, Debug, PartialEq, Eq)]
for ty in &mut substs { /// A (possible) solution for a proposed goal.
ty.walk_mut(&mut |ty| match ty { pub(crate) enum Solution {
Ty::Infer(InferTy::TypeVar(tv)) => { /// The goal indeed holds, and there is a unique value for all existential
let tv: &mut TypeVarId = tv; /// variables.
*tv = *canonical.entry(*tv).or_insert_with(|| { Unique(SolutionVariables),
let i = uncanonical.len();
uncanonical.push(*tv); /// The goal may be provable in multiple ways, but regardless we may have some guidance
TypeVarId(i as u32) /// for type inference. In this case, we don't return any lifetime
}); /// constraints, since we have not "committed" to any particular solution
} /// yet.
_ => {} Ambig(Guidance),
});
}
(TraitRef { substs: substs.into(), ..trait_ref }, uncanonical)
} }
fn unify_trait_refs(tr1: &TraitRef, tr2: &TraitRef) -> Option<Solution> { #[derive(Clone, Debug, PartialEq, Eq)]
if tr1.trait_ != tr2.trait_ { /// When a goal holds ambiguously (e.g., because there are multiple possible
return None; /// solutions), we issue a set of *guidance* back to type inference.
} pub(crate) enum Guidance {
let mut solution_substs = Vec::new(); /// The existential variables *must* have the given values if the goal is
for (t1, t2) in tr1.substs.0.iter().zip(tr2.substs.0.iter()) { /// ever to hold, but that alone isn't enough to guarantee the goal will
// this is very bad / hacky 'unification' logic, just enough to make the simple tests pass /// actually hold.
match (t1, t2) { Definite(SolutionVariables),
(_, Ty::Infer(InferTy::TypeVar(_))) | (_, Ty::Unknown) | (_, Ty::Param { .. }) => {
// type variable (or similar) in the impl, we just assume it works /// There are multiple plausible values for the existentials, but the ones
} /// here are suggested as the preferred choice heuristically. These should
(Ty::Infer(InferTy::TypeVar(v1)), _) => { /// be used for inference fallback only.
// type variable in the query and fixed type in the impl, record its value Suggested(SolutionVariables),
solution_substs.resize_with(v1.0 as usize + 1, || Ty::Unknown);
solution_substs[v1.0 as usize] = t2.clone(); /// There's no useful information to feed back to type inference
} Unknown,
_ => {
// check that they're equal (actually we'd have to recurse etc.)
if t1 != t2 {
return None;
}
}
}
}
Some(Solution::Unique(solution_substs.into()))
} }