Salsify the crate graph

I.e. make it not one giant input but multiple, for incrementality and decreased memory usage for Salsa 3 reasons.

crates/hir-def/src/expr_store/body.rs

@@ -86,7 +86,6 @@ impl Body {
                         let item_tree = f.id.item_tree(db);
                         let func = &item_tree[f.id.value];
                         let krate = f.container.module(db).krate;
-                        let crate_graph = db.crate_graph();
                         (
                             param_list,
                             (0..func.params.len()).map(move |idx| {
@@ -99,7 +98,7 @@ impl Body {
                                             Idx::from_raw(RawIdx::from(idx as u32)),
                                         ),
                                     )
-                                    .is_cfg_enabled(&crate_graph[krate].cfg_options)
+                                    .is_cfg_enabled(krate.cfg_options(db))
                             }),
                         )
                     });

crates/hir-def/src/expr_store/lower.rs

@@ -5,7 +5,7 @@ mod asm;
 
 use std::mem;
 
-use base_db::CrateId;
+use base_db::Crate;
 use either::Either;
 use hir_expand::{
     mod_path::tool_path,
@@ -50,7 +50,7 @@ use crate::{
     item_scope::BuiltinShadowMode,
     lang_item::LangItem,
     lower::LowerCtx,
-    nameres::{DefMap, MacroSubNs},
+    nameres::{DefMap, LocalDefMap, MacroSubNs},
     path::{GenericArgs, Path},
     type_ref::{Mutability, Rawness, TypeRef},
     AdtId, BlockId, BlockLoc, ConstBlockLoc, DefWithBodyId, MacroId, ModuleDefId, UnresolvedMacro,
@@ -64,7 +64,7 @@ pub(super) fn lower_body(
     expander: Expander,
     parameters: Option<(ast::ParamList, impl Iterator<Item = bool>)>,
     body: Option<ast::Expr>,
-    krate: CrateId,
+    krate: Crate,
     is_async_fn: bool,
 ) -> (Body, BodySourceMap) {
     // We cannot leave the root span map empty and let any identifier from it be treated as root,
@@ -189,7 +189,7 @@ pub(super) fn lower(
     owner: ExprStoreOwnerId,
     expander: Expander,
     body: Option<ast::Expr>,
-    krate: CrateId,
+    krate: Crate,
 ) -> (ExpressionStore, ExpressionStoreSourceMap) {
     // We cannot leave the root span map empty and let any identifier from it be treated as root,
     // because when inside nested macros `SyntaxContextId`s from the outer macro will be interleaved
@@ -214,8 +214,9 @@ struct ExprCollector<'a> {
     expander: Expander,
     owner: ExprStoreOwnerId,
     def_map: Arc<DefMap>,
+    local_def_map: Arc<LocalDefMap>,
     ast_id_map: Arc<AstIdMap>,
-    krate: CrateId,
+    krate: Crate,
     store: ExpressionStoreBuilder,
     source_map: ExpressionStoreSourceMap,
 
@@ -327,14 +328,16 @@ impl ExprCollector<'_> {
         db: &dyn DefDatabase,
         owner: ExprStoreOwnerId,
         expander: Expander,
-        krate: CrateId,
+        krate: Crate,
         span_map: Option<Arc<ExpansionSpanMap>>,
     ) -> ExprCollector<'_> {
+        let (def_map, local_def_map) = expander.module.local_def_map(db);
         ExprCollector {
             db,
             owner,
             krate,
-            def_map: expander.module.def_map(db),
+            def_map,
+            local_def_map,
             source_map: ExpressionStoreSourceMap::default(),
             ast_id_map: db.ast_id_map(expander.current_file_id()),
             store: ExpressionStoreBuilder::default(),
@@ -1306,6 +1309,7 @@ impl ExprCollector<'_> {
             None => self.expander.enter_expand(self.db, mcall, |path| {
                 self.def_map
                     .resolve_path(
+                        &self.local_def_map,
                         self.db,
                         module,
                         path,
@@ -1608,6 +1612,7 @@ impl ExprCollector<'_> {
                     // This could also be a single-segment path pattern. To
                     // decide that, we need to try resolving the name.
                     let (resolved, _) = self.def_map.resolve_path(
+                        &self.local_def_map,
                         self.db,
                         self.expander.module.local_id,
                         &name.clone().into(),

crates/hir-def/src/expr_store/tests.rs

@@ -293,7 +293,7 @@ impl SsrError {
     assert_eq!(db.body_with_source_map(def).1.diagnostics(), &[]);
     expect![[r#"
         fn main() -> () {
-            _ = $crate::error::SsrError::new(
+            _ = ra_test_fixture::error::SsrError::new(
                 builtin#lang(Arguments::new_v1_formatted)(
                     &[
                         "Failed to resolve path `", "`",
@@ -353,7 +353,7 @@ fn f(a: i32, b: u32) -> String {
     expect![[r#"
         fn f(a: i32, b: u32) -> String {
             {
-                $crate::panicking::panic_fmt(
+                core::panicking::panic_fmt(
                     builtin#lang(Arguments::new_v1_formatted)(
                         &[
                             "cc",