4 files changed, 76 insertions, 19 deletions

diff --git a/crates/ra_hir/src/code_model.rs b/crates/ra_hir/src/code_model.rs
index f436d5d5e..c49190a0f 100644
--- a/crates/ra_hir/src/code_model.rs
+++ b/crates/ra_hir/src/code_model.rs
@@ -12,7 +12,8 @@ use hir_def::{
     builtin_type::BuiltinType,
     traits::TraitData,
     type_ref::{Mutability, TypeRef},
-    AssocItemId, CrateModuleId, ImplId, LocalEnumVariantId, LocalStructFieldId, ModuleId, UnionId,
+    AssocItemId, CrateModuleId, FunctionContainerId, HasModule, ImplId, LocalEnumVariantId,
+    LocalStructFieldId, Lookup, ModuleId, UnionId,
 };
 use hir_expand::{
     diagnostics::DiagnosticSink,
@@ -647,7 +648,7 @@ impl FnData {
 
 impl Function {
     pub fn module(self, db: &impl DefDatabase) -> Module {
-        Module { id: self.id.module(db) }
+        self.id.lookup(db).module(db).into()
     }
 
     pub fn krate(self, db: &impl DefDatabase) -> Option<Crate> {
@@ -680,21 +681,25 @@ impl Function {
 
     /// The containing impl block, if this is a method.
     pub fn impl_block(self, db: &impl DefDatabase) -> Option<ImplBlock> {
-        ImplBlock::containing(db, self.into())
+        match self.container(db) {
+            Some(Container::ImplBlock(it)) => Some(it),
+            _ => None,
+        }
     }
 
     /// The containing trait, if this is a trait method definition.
     pub fn parent_trait(self, db: &impl DefDatabase) -> Option<Trait> {
-        db.trait_items_index(self.module(db).id).get_parent_trait(self.id.into()).map(Trait::from)
+        match self.container(db) {
+            Some(Container::Trait(it)) => Some(it),
+            _ => None,
+        }
     }
 
     pub fn container(self, db: &impl DefDatabase) -> Option<Container> {
-        if let Some(impl_block) = self.impl_block(db) {
-            Some(impl_block.into())
-        } else if let Some(trait_) = self.parent_trait(db) {
-            Some(trait_.into())
-        } else {
-            None
+        match self.id.lookup(db).container {
+            FunctionContainerId::TraitId(it) => Some(Container::Trait(it.into())),
+            FunctionContainerId::ImplId(it) => Some(Container::ImplBlock(it.into())),
+            FunctionContainerId::ModuleId(_) => None,
         }
     }
 
diff --git a/crates/ra_hir/src/code_model/src.rs b/crates/ra_hir/src/code_model/src.rs
index 556417b0f..91cab7414 100644
--- a/crates/ra_hir/src/code_model/src.rs
+++ b/crates/ra_hir/src/code_model/src.rs
@@ -1,5 +1,6 @@
 //! FIXME: write short doc here
 
+use hir_def::{HasSource as _, Lookup};
 use ra_syntax::ast::{self, AstNode};
 
 use crate::{
@@ -113,7 +114,7 @@ impl HasSource for EnumVariant {
 impl HasSource for Function {
     type Ast = ast::FnDef;
     fn source(self, db: &(impl DefDatabase + AstDatabase)) -> Source<ast::FnDef> {
-        self.id.source(db)
+        self.id.lookup(db).source(db)
     }
 }
 impl HasSource for Const {
diff --git a/crates/ra_hir/src/from_source.rs b/crates/ra_hir/src/from_source.rs
index f4dca25cb..303d5f138 100644
--- a/crates/ra_hir/src/from_source.rs
+++ b/crates/ra_hir/src/from_source.rs
@@ -4,15 +4,15 @@ use hir_def::{ModuleId, StructId, StructOrUnionId, UnionId};
 use hir_expand::{name::AsName, AstId, MacroDefId, MacroDefKind};
 use ra_syntax::{
     ast::{self, AstNode, NameOwner},
-    match_ast,
+    match_ast, AstPtr,
 };
 
 use crate::{
     db::{AstDatabase, DefDatabase, HirDatabase},
     ids::{AstItemDef, LocationCtx},
-    Const, DefWithBody, Enum, EnumVariant, FieldSource, Function, HasBody, HasSource, ImplBlock,
-    Local, MacroDef, Module, ModuleSource, Source, Static, Struct, StructField, Trait, TypeAlias,
-    Union, VariantDef,
+    AssocItem, Const, DefWithBody, Enum, EnumVariant, FieldSource, Function, HasBody, HasSource,
+    ImplBlock, Local, MacroDef, Module, ModuleDef, ModuleSource, Source, Static, Struct,
+    StructField, Trait, TypeAlias, Union, VariantDef,
 };
 
 pub trait FromSource: Sized {
@@ -52,10 +52,51 @@ impl FromSource for Trait {
 impl FromSource for Function {
     type Ast = ast::FnDef;
     fn from_source(db: &(impl DefDatabase + AstDatabase), src: Source<Self::Ast>) -> Option<Self> {
-        let id = from_source(db, src)?;
-        Some(Function { id })
+        // FIXME: this doesn't try to handle nested declarations
+        for container in src.value.syntax().ancestors() {
+            let res = match_ast! {
+                match container {
+                    ast::TraitDef(it) => {
+                        let c = Trait::from_source(db, src.with_value(it))?;
+                        c.items(db)
+                            .into_iter()
+                            .filter_map(|it| match it {
+                                AssocItem::Function(it) => Some(it),
+                                _ => None
+                            })
+                            .find(|it| same_source(&it.source(db), &src))?
+                    },
+                    ast::ImplBlock(it) => {
+                        let c = ImplBlock::from_source(db, src.with_value(it))?;
+                        c.items(db)
+                            .into_iter()
+                            .filter_map(|it| match it {
+                                AssocItem::Function(it) => Some(it),
+                                _ => None
+                            })
+                            .find(|it| same_source(&it.source(db), &src))?
+
+                     },
+                    _ => { continue },
+                }
+            };
+            return Some(res);
+        }
+
+        let module_source = ModuleSource::from_child_node(db, src.as_ref().map(|it| it.syntax()));
+        let c = Module::from_definition(db, src.with_value(module_source))?;
+        let res = c
+            .declarations(db)
+            .into_iter()
+            .filter_map(|it| match it {
+                ModuleDef::Function(it) => Some(it),
+                _ => None,
+            })
+            .find(|it| same_source(&it.source(db), &src));
+        res
     }
 }
+
 impl FromSource for Const {
     type Ast = ast::ConstDef;
     fn from_source(db: &(impl DefDatabase + AstDatabase), src: Source<Self::Ast>) -> Option<Self> {
@@ -108,7 +149,7 @@ impl FromSource for EnumVariant {
         let parent_enum = src.value.parent_enum();
         let src_enum = Source { file_id: src.file_id, value: parent_enum };
         let variants = Enum::from_source(db, src_enum)?.variants(db);
-        variants.into_iter().find(|v| v.source(db) == src)
+        variants.into_iter().find(|v| same_source(&v.source(db), &src))
     }
 }
 
@@ -216,3 +257,13 @@ where
     let ctx = LocationCtx::new(db, module.id, src.file_id);
     Some(DEF::from_ast(ctx, &src.value))
 }
+
+/// XXX: AST Nodes and SyntaxNodes have identity equality semantics: nodes are
+/// equal if they point to exactly the same object.
+///
+/// In general, we do not guarantee that we have exactly one instance of a
+/// syntax tree for each file. We probably should add such guanratree, but, for
+/// the time being, we will use identity-less AstPtr comparison.
+fn same_source<N: AstNode>(s1: &Source<N>, s2: &Source<N>) -> bool {
+    s1.as_ref().map(AstPtr::new) == s2.as_ref().map(AstPtr::new)
+}
diff --git a/crates/ra_hir/src/source_binder.rs b/crates/ra_hir/src/source_binder.rs
index a1c1daacd..5d9e22ee2 100644
--- a/crates/ra_hir/src/source_binder.rs
+++ b/crates/ra_hir/src/source_binder.rs
@@ -70,7 +70,7 @@ fn def_with_body_from_child_node(
     child.value.ancestors().find_map(|node| {
         match_ast! {
             match node {
-                ast::FnDef(def)  => { Some(Function {id: ctx.to_def(&def) }.into()) },
+                ast::FnDef(def)  => { return Function::from_source(db, child.with_value(def)).map(DefWithBody::from); },
                 ast::ConstDef(def) => { Some(Const { id: ctx.to_def(&def) }.into()) },
                 ast::StaticDef(def) => { Some(Static { id: ctx.to_def(&def) }.into()) },
                 _ => { None },