rustc_metadata: Merge `cstore.rs` into `creader.rs`

src/librustc_interface/passes.rs

@@ -25,7 +25,6 @@ use rustc_data_structures::{box_region_allow_access, declare_box_region_type, pa
 use rustc_data_structures::sync::{Lrc, ParallelIterator, par_iter};
 use rustc_errors::PResult;
 use rustc_incremental;
-use rustc_metadata::cstore;
 use rustc_mir as mir;
 use rustc_parse::{parse_crate_from_file, parse_crate_from_source_str};
 use rustc_passes::{self, ast_validation, hir_stats, layout_test};
@@ -728,15 +727,15 @@ pub fn default_provide(providers: &mut ty::query::Providers<'_>) {
     rustc_passes::provide(providers);
     rustc_traits::provide(providers);
     middle::region::provide(providers);
-    cstore::provide(providers);
+    rustc_metadata::provide(providers);
     lint::provide(providers);
     rustc_lint::provide(providers);
     rustc_codegen_utils::provide(providers);
     rustc_codegen_ssa::provide(providers);
 }
 
 pub fn default_provide_extern(providers: &mut ty::query::Providers<'_>) {
-    cstore::provide_extern(providers);
+    rustc_metadata::provide_extern(providers);
     rustc_codegen_ssa::provide_extern(providers);
 }
 

src/librustc_metadata/creader.rs

@@ -1,11 +1,12 @@
 //! Validates all used crates and extern libraries and loads their metadata
 
-use crate::cstore::CStore;
 use crate::locator::{CrateLocator, CratePaths};
 use crate::rmeta::{CrateMetadata, CrateNumMap, CrateRoot, CrateDep, MetadataBlob};
 
 use rustc::hir::def_id::CrateNum;
 use rustc_data_structures::svh::Svh;
+use rustc_data_structures::sync::Lrc;
+use rustc_index::vec::IndexVec;
 use rustc::middle::cstore::DepKind;
 use rustc::session::{Session, CrateDisambiguator};
 use rustc::session::config::{Sanitizer, self};
@@ -21,18 +22,22 @@ use std::{cmp, fs};
 
 use syntax::ast;
 use syntax::attr;
+use syntax::edition::Edition;
 use syntax::expand::allocator::{global_allocator_spans, AllocatorKind};
 use syntax::symbol::{Symbol, sym};
 use syntax::span_fatal;
+use syntax_expand::base::SyntaxExtension;
 use syntax_pos::{Span, DUMMY_SP};
 use log::{debug, info, log_enabled};
 use proc_macro::bridge::client::ProcMacro;
 
 use rustc_error_codes::*;
 
-crate struct Library {
-    pub source: CrateSource,
-    pub metadata: MetadataBlob,
+#[derive(Clone)]
+pub struct CStore {
+    metas: IndexVec<CrateNum, Option<Lrc<CrateMetadata>>>,
+    crate injected_panic_runtime: Option<CrateNum>,
+    crate allocator_kind: Option<AllocatorKind>,
 }
 
 pub struct CrateLoader<'a> {
@@ -44,6 +49,33 @@ pub struct CrateLoader<'a> {
     cstore: CStore,
 }
 
+pub enum LoadedMacro {
+    MacroDef(ast::Item, Edition),
+    ProcMacro(SyntaxExtension),
+}
+
+crate struct Library {
+    pub source: CrateSource,
+    pub metadata: MetadataBlob,
+}
+
+enum LoadResult {
+    Previous(CrateNum),
+    Loaded(Library),
+}
+
+enum LoadError<'a> {
+    LocatorError(CrateLocator<'a>),
+}
+
+impl<'a> LoadError<'a> {
+    fn report(self) -> ! {
+        match self {
+            LoadError::LocatorError(locator) => locator.report_errs(),
+        }
+    }
+}
+
 fn dump_crates(cstore: &CStore) {
     info!("resolved crates:");
     cstore.iter_crate_data(|cnum, data| {
@@ -58,21 +90,58 @@ fn dump_crates(cstore: &CStore) {
     });
 }
 
-enum LoadResult {
-    Previous(CrateNum),
-    Loaded(Library),
-}
+impl CStore {
+    crate fn alloc_new_crate_num(&mut self) -> CrateNum {
+        self.metas.push(None);
+        CrateNum::new(self.metas.len() - 1)
+    }
 
-enum LoadError<'a> {
-    LocatorError(CrateLocator<'a>),
-}
+    crate fn get_crate_data(&self, cnum: CrateNum) -> &CrateMetadata {
+        self.metas[cnum].as_ref()
+            .unwrap_or_else(|| panic!("Failed to get crate data for {:?}", cnum))
+    }
 
-impl<'a> LoadError<'a> {
-    fn report(self) -> ! {
-        match self {
-            LoadError::LocatorError(locator) => locator.report_errs(),
+    crate fn set_crate_data(&mut self, cnum: CrateNum, data: CrateMetadata) {
+        assert!(self.metas[cnum].is_none(), "Overwriting crate metadata entry");
+        self.metas[cnum] = Some(Lrc::new(data));
+    }
+
+    crate fn iter_crate_data(&self, mut f: impl FnMut(CrateNum, &CrateMetadata)) {
+        for (cnum, data) in self.metas.iter_enumerated() {
+            if let Some(data) = data {
+                f(cnum, data);
+            }
+        }
+    }
+
+    fn push_dependencies_in_postorder(&self, deps: &mut Vec<CrateNum>, cnum: CrateNum) {
+        if !deps.contains(&cnum) {
+            let data = self.get_crate_data(cnum);
+            for &dep in data.dependencies().iter() {
+                if dep != cnum {
+                    self.push_dependencies_in_postorder(deps, dep);
+                }
+            }
+
+            deps.push(cnum);
         }
     }
+
+    crate fn crate_dependencies_in_postorder(&self, cnum: CrateNum) -> Vec<CrateNum> {
+        let mut deps = Vec::new();
+        if cnum == LOCAL_CRATE {
+            self.iter_crate_data(|cnum, _| self.push_dependencies_in_postorder(&mut deps, cnum));
+        } else {
+            self.push_dependencies_in_postorder(&mut deps, cnum);
+        }
+        deps
+    }
+
+    crate fn crate_dependencies_in_reverse_postorder(&self, cnum: CrateNum) -> Vec<CrateNum> {
+        let mut deps = self.crate_dependencies_in_postorder(cnum);
+        deps.reverse();
+        deps
+    }
 }
 
 impl<'a> CrateLoader<'a> {
@@ -85,7 +154,15 @@ impl<'a> CrateLoader<'a> {
             sess,
             metadata_loader,
             local_crate_name: Symbol::intern(local_crate_name),
-            cstore: Default::default(),
+            cstore: CStore {
+                // We add an empty entry for LOCAL_CRATE (which maps to zero) in
+                // order to make array indices in `metas` match with the
+                // corresponding `CrateNum`. This first entry will always remain
+                // `None`.
+                metas: IndexVec::from_elem_n(None, 1),
+                injected_panic_runtime: None,
+                allocator_kind: None,
+            }
         }
     }
 

src/librustc_metadata/lib.rs

@@ -24,14 +24,15 @@ extern crate rustc;
 #[macro_use]
 extern crate rustc_data_structures;
 
+pub use rmeta::{provide, provide_extern};
+
 mod dependency_format;
 mod foreign_modules;
 mod link_args;
 mod native_libs;
 mod rmeta;
 
 pub mod creader;
-pub mod cstore;
 pub mod dynamic_lib;
 pub mod locator;
 

src/librustc_metadata/rmeta/decoder/cstore_impl.rs

@@ -1,4 +1,4 @@
-use crate::cstore::{self, LoadedMacro};
+use crate::creader::{CStore, LoadedMacro};
 use crate::link_args;
 use crate::native_libs;
 use crate::foreign_modules;
@@ -382,7 +382,7 @@ pub fn provide(providers: &mut Providers<'_>) {
     };
 }
 
-impl cstore::CStore {
+impl CStore {
     pub fn export_macros_untracked(&self, cnum: CrateNum) {
         let data = self.get_crate_data(cnum);
         let mut dep_kind = data.dep_kind.lock();
@@ -458,7 +458,7 @@ impl cstore::CStore {
     }
 }
 
-impl CrateStore for cstore::CStore {
+impl CrateStore for CStore {
     fn crate_data_as_any(&self, cnum: CrateNum) -> &dyn Any {
         self.get_crate_data(cnum)
     }

src/librustc_resolve/build_reduced_graph.rs

@@ -19,7 +19,7 @@ use rustc::hir::def::{self, *};
 use rustc::hir::def_id::{CRATE_DEF_INDEX, LOCAL_CRATE, DefId};
 use rustc::ty;
 use rustc::middle::cstore::CrateStore;
-use rustc_metadata::cstore::LoadedMacro;
+use rustc_metadata::creader::LoadedMacro;
 
 use std::cell::Cell;
 use std::ptr;

src/librustc_resolve/lib.rs

@@ -32,8 +32,7 @@ use rustc::ty::{self, DefIdTree, ResolverOutputs};
 use rustc::util::nodemap::{NodeMap, NodeSet, FxHashMap, FxHashSet, DefIdMap};
 use rustc::span_bug;
 
-use rustc_metadata::creader::CrateLoader;
-use rustc_metadata::cstore::CStore;
+use rustc_metadata::creader::{CrateLoader, CStore};
 
 use syntax::{struct_span_err, unwrap_or};
 use syntax::ast::{self, Name, NodeId, Ident, FloatTy, IntTy, UintTy};

src/librustdoc/clean/inline.rs

@@ -10,7 +10,7 @@ use syntax_pos::Span;
 use rustc::hir;
 use rustc::hir::def::{Res, DefKind, CtorKind};
 use rustc::hir::def_id::DefId;
-use rustc_metadata::cstore::LoadedMacro;
+use rustc_metadata::creader::LoadedMacro;
 use rustc::ty;
 use rustc::util::nodemap::FxHashSet;