From e85ee60c42db57368e24ad9ac24840c2494d383c Mon Sep 17 00:00:00 2001 From: Marco Groppo Date: Mon, 15 Apr 2019 00:03:54 +0200 Subject: Initial support for lang items. --- crates/ra_hir/src/db.rs | 4 ++ crates/ra_hir/src/lang_item.rs | 102 ++++++++++++++++++++++++++++++ crates/ra_hir/src/lib.rs | 1 + crates/ra_hir/src/nameres.rs | 4 ++ crates/ra_hir/src/resolve.rs | 2 +- crates/ra_hir/src/ty/infer.rs | 54 ++++++++-------- crates/ra_hir/src/ty/method_resolution.rs | 38 +++++++++-- 7 files changed, 175 insertions(+), 30 deletions(-) create mode 100644 crates/ra_hir/src/lang_item.rs (limited to 'crates/ra_hir/src') diff --git a/crates/ra_hir/src/db.rs b/crates/ra_hir/src/db.rs index 18627bbc2..b27efcbe3 100644 --- a/crates/ra_hir/src/db.rs +++ b/crates/ra_hir/src/db.rs @@ -16,6 +16,7 @@ use crate::{ generics::{GenericParams, GenericDef}, type_ref::TypeRef, traits::TraitData, Trait, ty::TraitRef, + lang_item::LangItems, ids }; @@ -100,6 +101,9 @@ pub trait DefDatabase: SourceDatabase { #[salsa::invoke(crate::ConstSignature::static_signature_query)] fn static_signature(&self, konst: Static) -> Arc; + + #[salsa::invoke(crate::lang_item::LangItems::lang_items_query)] + fn lang_items(&self, krate: Crate) -> Arc; } #[salsa::query_group(HirDatabaseStorage)] diff --git a/crates/ra_hir/src/lang_item.rs b/crates/ra_hir/src/lang_item.rs new file mode 100644 index 000000000..adcc682a2 --- /dev/null +++ b/crates/ra_hir/src/lang_item.rs @@ -0,0 +1,102 @@ +use std::sync::Arc; +use rustc_hash::FxHashMap; + +use ra_syntax::{SmolStr, ast::AttrsOwner}; + +use crate::{ + Crate, DefDatabase, Enum, Function, HirDatabase, ImplBlock, Module, Static, Struct, Trait +}; + +#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)] +pub enum LangItemTarget { + Enum(Enum), + Function(Function), + Impl(ImplBlock), + Static(Static), + Struct(Struct), + Trait(Trait), +} + +impl LangItemTarget { + pub(crate) fn krate(&self, db: &impl HirDatabase) -> Option { + match self { + LangItemTarget::Enum(e) => e.module(db).krate(db), + LangItemTarget::Function(f) => f.module(db).krate(db), + LangItemTarget::Impl(i) => i.module().krate(db), + LangItemTarget::Static(s) => s.module(db).krate(db), + LangItemTarget::Struct(s) => s.module(db).krate(db), + LangItemTarget::Trait(t) => t.module(db).krate(db), + } + } +} + +#[derive(Debug, Clone, PartialEq, Eq)] +pub struct LangItems { + items: FxHashMap, +} + +impl LangItems { + pub fn target<'a>(&'a self, item: &str) -> Option<&'a LangItemTarget> { + self.items.get(item) + } + + /// Salsa query. This will query a specific crate for lang items. + pub(crate) fn lang_items_query(db: &impl DefDatabase, krate: Crate) -> Arc { + let mut lang_items = LangItems { items: FxHashMap::default() }; + + if let Some(module) = krate.root_module(db) { + lang_items.collect_lang_items_recursive(db, &module); + } + + Arc::new(lang_items) + } + + fn collect_lang_items_recursive(&mut self, db: &impl DefDatabase, module: &Module) { + // Look for impl targets + let (impl_blocks, source_map) = db.impls_in_module_with_source_map(module.clone()); + let source = module.definition_source(db).1; + for (impl_id, _) in impl_blocks.impls.iter() { + let impl_block = source_map.get(&source, impl_id); + let lang_item_name = impl_block + .attrs() + .filter_map(|a| a.as_key_value()) + .filter(|(key, _)| key == "lang") + .map(|(_, val)| val) + .nth(0); + if let Some(lang_item_name) = lang_item_name { + let imp = ImplBlock::from_id(*module, impl_id); + self.items.entry(lang_item_name).or_insert(LangItemTarget::Impl(imp)); + } + } + + // FIXME we should look for the other lang item targets (traits, structs, ...) + + // Look for lang items in the children + for child in module.children(db) { + self.collect_lang_items_recursive(db, &child); + } + } +} + +/// Look for a lang item, starting from the specified crate and recursively traversing its +/// dependencies. +pub(crate) fn lang_item_lookup( + db: &impl DefDatabase, + start_krate: Crate, + item: &str, +) -> Option { + let lang_items = db.lang_items(start_krate); + let start_krate_target = lang_items.items.get(item); + if start_krate_target.is_some() { + start_krate_target.map(|t| *t) + } else { + for dep in start_krate.dependencies(db) { + let dep_krate = dep.krate; + let dep_target = lang_item_lookup(db, dep_krate, item); + if dep_target.is_some() { + return dep_target; + } + } + None + } +} diff --git a/crates/ra_hir/src/lib.rs b/crates/ra_hir/src/lib.rs index 9292de1b5..4411715de 100644 --- a/crates/ra_hir/src/lib.rs +++ b/crates/ra_hir/src/lib.rs @@ -36,6 +36,7 @@ mod type_ref; mod ty; mod impl_block; mod expr; +mod lang_item; mod generics; mod docs; mod resolve; diff --git a/crates/ra_hir/src/nameres.rs b/crates/ra_hir/src/nameres.rs index 0eddfab12..39152360c 100644 --- a/crates/ra_hir/src/nameres.rs +++ b/crates/ra_hir/src/nameres.rs @@ -202,6 +202,10 @@ impl CrateDefMap { Arc::new(def_map) } + pub(crate) fn krate(&self) -> Crate { + self.krate + } + pub(crate) fn root(&self) -> CrateModuleId { self.root } diff --git a/crates/ra_hir/src/resolve.rs b/crates/ra_hir/src/resolve.rs index 685f4b8b1..61925e832 100644 --- a/crates/ra_hir/src/resolve.rs +++ b/crates/ra_hir/src/resolve.rs @@ -190,7 +190,7 @@ impl Resolver { .flatten() } - fn module(&self) -> Option<(&CrateDefMap, CrateModuleId)> { + pub(crate) fn module(&self) -> Option<(&CrateDefMap, CrateModuleId)> { self.scopes.iter().rev().find_map(|scope| match scope { Scope::ModuleScope(m) => Some((&*m.crate_def_map, m.module_id)), diff --git a/crates/ra_hir/src/ty/infer.rs b/crates/ra_hir/src/ty/infer.rs index 7ca1ff595..2275ac151 100644 --- a/crates/ra_hir/src/ty/infer.rs +++ b/crates/ra_hir/src/ty/infer.rs @@ -462,6 +462,7 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> { let remaining_index = remaining_index.unwrap_or(path.segments.len()); let mut actual_def_ty: Option = None; + let krate = resolver.module().map(|t| t.0.krate()); // resolve intermediate segments for (i, segment) in path.segments[remaining_index..].iter().enumerate() { let ty = match resolved { @@ -500,38 +501,41 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> { // Attempt to find an impl_item for the type which has a name matching // the current segment log::debug!("looking for path segment: {:?}", segment); + actual_def_ty = Some(ty.clone()); - let item: crate::ModuleDef = ty.iterate_impl_items(self.db, |item| { - let matching_def: Option = match item { - crate::ImplItem::Method(func) => { - let sig = func.signature(self.db); - if segment.name == *sig.name() { - Some(func.into()) - } else { - None + let item: crate::ModuleDef = krate.and_then(|k| { + ty.iterate_impl_items(self.db, k, |item| { + let matching_def: Option = match item { + crate::ImplItem::Method(func) => { + let sig = func.signature(self.db); + if segment.name == *sig.name() { + Some(func.into()) + } else { + None + } } - } - crate::ImplItem::Const(konst) => { - let sig = konst.signature(self.db); - if segment.name == *sig.name() { - Some(konst.into()) - } else { - None + crate::ImplItem::Const(konst) => { + let sig = konst.signature(self.db); + if segment.name == *sig.name() { + Some(konst.into()) + } else { + None + } } - } - // FIXME: Resolve associated types - crate::ImplItem::TypeAlias(_) => None, - }; - match matching_def { - Some(_) => { - self.write_assoc_resolution(id, item); - return matching_def; + // FIXME: Resolve associated types + crate::ImplItem::TypeAlias(_) => None, + }; + match matching_def { + Some(_) => { + self.write_assoc_resolution(id, item); + return matching_def; + } + None => None, } - None => None, - } + }) })?; resolved = Resolution::Def(item.into()); diff --git a/crates/ra_hir/src/ty/method_resolution.rs b/crates/ra_hir/src/ty/method_resolution.rs index 667b66095..ba516313c 100644 --- a/crates/ra_hir/src/ty/method_resolution.rs +++ b/crates/ra_hir/src/ty/method_resolution.rs @@ -14,6 +14,8 @@ use crate::{ resolve::Resolver, traits::TraitItem, generics::HasGenericParams, + lang_item::lang_item_lookup, + ty::primitive::{UncertainIntTy, UncertainFloatTy} }; use super::{TraitRef, Substs}; @@ -110,10 +112,33 @@ impl CrateImplBlocks { } } -fn def_crate(db: &impl HirDatabase, ty: &Ty) -> Option { +/// Rudimentary check whether an impl exists for a given type and trait; this +/// will actually be done by chalk. +pub(crate) fn implements(db: &impl HirDatabase, trait_ref: TraitRef) -> bool { + // FIXME use all trait impls in the whole crate graph + let krate = trait_ref.trait_.module(db).krate(db); + let krate = match krate { + Some(krate) => krate, + None => return false, + }; + let crate_impl_blocks = db.impls_in_crate(krate); + let mut impl_blocks = crate_impl_blocks.lookup_impl_blocks_for_trait(&trait_ref.trait_); + impl_blocks.any(|impl_block| &impl_block.target_ty(db) == trait_ref.self_ty()) +} + +fn def_crate(db: &impl HirDatabase, cur_krate: Crate, ty: &Ty) -> Option { match ty { Ty::Apply(a_ty) => match a_ty.ctor { TypeCtor::Adt(def_id) => def_id.krate(db), + TypeCtor::Bool => lang_item_lookup(db, cur_krate, "bool")?.krate(db), + TypeCtor::Char => lang_item_lookup(db, cur_krate, "char")?.krate(db), + TypeCtor::Float(UncertainFloatTy::Known(f)) => { + lang_item_lookup(db, cur_krate, f.ty_to_string())?.krate(db) + } + TypeCtor::Int(UncertainIntTy::Known(i)) => { + lang_item_lookup(db, cur_krate, i.ty_to_string())?.krate(db) + } + TypeCtor::Str => lang_item_lookup(db, cur_krate, "str")?.krate(db), _ => None, }, _ => None, @@ -150,8 +175,11 @@ impl Ty { // find in the end takes &self, we still do the autoderef step (just as // rustc does an autoderef and then autoref again). + let krate = resolver.module().map(|t| t.0.krate())?; for derefed_ty in self.autoderef(db) { - if let Some(result) = derefed_ty.iterate_inherent_methods(db, name, &mut callback) { + if let Some(result) = + derefed_ty.iterate_inherent_methods(db, name, krate, &mut callback) + { return Some(result); } if let Some(result) = @@ -208,9 +236,10 @@ impl Ty { &self, db: &impl HirDatabase, name: Option<&Name>, + krate: Crate, mut callback: impl FnMut(&Ty, Function) -> Option, ) -> Option { - let krate = match def_crate(db, self) { + let krate = match def_crate(db, krate, self) { Some(krate) => krate, None => return None, }; @@ -239,9 +268,10 @@ impl Ty { pub fn iterate_impl_items( self, db: &impl HirDatabase, + krate: Crate, mut callback: impl FnMut(ImplItem) -> Option, ) -> Option { - let krate = def_crate(db, &self)?; + let krate = def_crate(db, krate, &self)?; let impls = db.impls_in_crate(krate); for impl_block in impls.lookup_impl_blocks(&self) { -- cgit v1.2.3