Revert "Merge CrateDisambiguator into StableCrateId"

This reverts commit d0ec85d3fb.

compiler/rustc_metadata/src/creader.rs

@@ -21,7 +21,7 @@ use rustc_session::config::{self, CrateType, ExternLocation};
 use rustc_session::lint::{self, BuiltinLintDiagnostics, ExternDepSpec};
 use rustc_session::output::validate_crate_name;
 use rustc_session::search_paths::PathKind;
-use rustc_session::Session;
+use rustc_session::{CrateDisambiguator, Session};
 use rustc_span::edition::Edition;
 use rustc_span::symbol::{sym, Symbol};
 use rustc_span::{Span, DUMMY_SP};
@@ -222,8 +222,10 @@ impl<'a> CrateLoader<'a> {
         metadata_loader: &'a MetadataLoaderDyn,
         local_crate_name: &str,
     ) -> Self {
+        let local_crate_stable_id =
+            StableCrateId::new(local_crate_name, sess.local_crate_disambiguator());
         let mut stable_crate_ids = FxHashMap::default();
-        stable_crate_ids.insert(sess.local_stable_crate_id(), LOCAL_CRATE);
+        stable_crate_ids.insert(local_crate_stable_id, LOCAL_CRATE);
 
         CrateLoader {
             sess,
@@ -325,14 +327,17 @@ impl<'a> CrateLoader<'a> {
 
     fn verify_no_symbol_conflicts(&self, root: &CrateRoot<'_>) -> Result<(), CrateError> {
         // Check for (potential) conflicts with the local crate
-        if self.sess.local_stable_crate_id() == root.stable_crate_id() {
+        if self.local_crate_name == root.name()
+            && self.sess.local_crate_disambiguator() == root.disambiguator()
+        {
             return Err(CrateError::SymbolConflictsCurrent(root.name()));
         }
 
         // Check for conflicts with any crate loaded so far
         let mut res = Ok(());
         self.cstore.iter_crate_data(|_, other| {
-            if other.stable_crate_id() == root.stable_crate_id() && // same stable crate id
+            if other.name() == root.name() && // same crate-name
+               other.disambiguator() == root.disambiguator() && // same crate-disambiguator
                other.hash() != root.hash()
             {
                 // but different SVH
@@ -406,7 +411,7 @@ impl<'a> CrateLoader<'a> {
                 None => (&source, &crate_root),
             };
             let dlsym_dylib = dlsym_source.dylib.as_ref().expect("no dylib for a proc-macro crate");
-            Some(self.dlsym_proc_macros(&dlsym_dylib.0, dlsym_root.stable_crate_id())?)
+            Some(self.dlsym_proc_macros(&dlsym_dylib.0, dlsym_root.disambiguator())?)
         } else {
             None
         };
@@ -659,7 +664,7 @@ impl<'a> CrateLoader<'a> {
     fn dlsym_proc_macros(
         &self,
         path: &Path,
-        stable_crate_id: StableCrateId,
+        disambiguator: CrateDisambiguator,
     ) -> Result<&'static [ProcMacro], CrateError> {
         // Make sure the path contains a / or the linker will search for it.
         let path = env::current_dir().unwrap().join(path);
@@ -668,7 +673,7 @@ impl<'a> CrateLoader<'a> {
             Err(s) => return Err(CrateError::DlOpen(s)),
         };
 
-        let sym = self.sess.generate_proc_macro_decls_symbol(stable_crate_id);
+        let sym = self.sess.generate_proc_macro_decls_symbol(disambiguator);
         let decls = unsafe {
             let sym = match lib.symbol(&sym) {
                 Ok(f) => f,

compiler/rustc_metadata/src/locator.rs

@@ -226,7 +226,7 @@ use rustc_session::config::{self, CrateType};
 use rustc_session::filesearch::{FileDoesntMatch, FileMatches, FileSearch};
 use rustc_session::search_paths::PathKind;
 use rustc_session::utils::CanonicalizedPath;
-use rustc_session::{Session, StableCrateId};
+use rustc_session::{CrateDisambiguator, Session};
 use rustc_span::symbol::{sym, Symbol};
 use rustc_span::Span;
 use rustc_target::spec::{Target, TargetTriple};
@@ -787,7 +787,7 @@ pub fn find_plugin_registrar(
     metadata_loader: &dyn MetadataLoader,
     span: Span,
     name: Symbol,
-) -> (PathBuf, StableCrateId) {
+) -> (PathBuf, CrateDisambiguator) {
     match find_plugin_registrar_impl(sess, metadata_loader, name) {
         Ok(res) => res,
         // `core` is always available if we got as far as loading plugins.
@@ -799,7 +799,7 @@ fn find_plugin_registrar_impl<'a>(
     sess: &'a Session,
     metadata_loader: &dyn MetadataLoader,
     name: Symbol,
-) -> Result<(PathBuf, StableCrateId), CrateError> {
+) -> Result<(PathBuf, CrateDisambiguator), CrateError> {
     info!("find plugin registrar `{}`", name);
     let mut locator = CrateLocator::new(
         sess,
@@ -816,7 +816,7 @@ fn find_plugin_registrar_impl<'a>(
 
     match locator.maybe_load_library_crate()? {
         Some(library) => match library.source.dylib {
-            Some(dylib) => Ok((dylib.0, library.metadata.get_root().stable_crate_id())),
+            Some(dylib) => Ok((dylib.0, library.metadata.get_root().disambiguator())),
             None => Err(CrateError::NonDylibPlugin(name)),
         },
         None => Err(locator.into_error()),

compiler/rustc_metadata/src/rmeta/decoder.rs

@@ -620,6 +620,10 @@ impl CrateRoot<'_> {
         self.name
     }
 
+    crate fn disambiguator(&self) -> CrateDisambiguator {
+        self.disambiguator
+    }
+
     crate fn hash(&self) -> Svh {
         self.hash
     }
@@ -1923,8 +1927,8 @@ impl CrateMetadata {
         self.root.name
     }
 
-    crate fn stable_crate_id(&self) -> StableCrateId {
-        self.root.stable_crate_id
+    crate fn disambiguator(&self) -> CrateDisambiguator {
+        self.root.disambiguator
     }
 
     crate fn hash(&self) -> Svh {

compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs

@@ -19,7 +19,7 @@ use rustc_middle::middle::stability::DeprecationEntry;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::{self, TyCtxt, Visibility};
 use rustc_session::utils::NativeLibKind;
-use rustc_session::{Session, StableCrateId};
+use rustc_session::{CrateDisambiguator, Session};
 use rustc_span::source_map::{Span, Spanned};
 use rustc_span::symbol::Symbol;
 
@@ -186,6 +186,7 @@ provide! { <'tcx> tcx, def_id, other, cdata,
     }
     native_libraries => { Lrc::new(cdata.get_native_libraries(tcx.sess)) }
     foreign_modules => { cdata.get_foreign_modules(tcx) }
+    crate_disambiguator => { cdata.root.disambiguator }
     crate_hash => { cdata.root.hash }
     crate_host_hash => { cdata.host_hash }
     crate_name => { cdata.root.name }
@@ -488,8 +489,8 @@ impl CrateStore for CStore {
         self.get_crate_data(cnum).root.name
     }
 
-    fn stable_crate_id_untracked(&self, cnum: CrateNum) -> StableCrateId {
-        self.get_crate_data(cnum).root.stable_crate_id
+    fn crate_disambiguator_untracked(&self, cnum: CrateNum) -> CrateDisambiguator {
+        self.get_crate_data(cnum).root.disambiguator
     }
 
     fn crate_hash_untracked(&self, cnum: CrateNum) -> Svh {

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -671,6 +671,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
             extra_filename: tcx.sess.opts.cg.extra_filename.clone(),
             triple: tcx.sess.opts.target_triple.clone(),
             hash: tcx.crate_hash(LOCAL_CRATE),
+            disambiguator: tcx.sess.local_crate_disambiguator(),
             stable_crate_id: tcx.def_path_hash(LOCAL_CRATE.as_def_id()).stable_crate_id(),
             panic_strategy: tcx.sess.panic_strategy(),
             edition: tcx.sess.edition(),

compiler/rustc_metadata/src/rmeta/mod.rs

@@ -18,6 +18,7 @@ use rustc_middle::mir;
 use rustc_middle::ty::{self, ReprOptions, Ty};
 use rustc_serialize::opaque::Encoder;
 use rustc_session::config::SymbolManglingVersion;
+use rustc_session::CrateDisambiguator;
 use rustc_span::edition::Edition;
 use rustc_span::hygiene::MacroKind;
 use rustc_span::symbol::{Ident, Symbol};
@@ -201,6 +202,7 @@ crate struct CrateRoot<'tcx> {
     triple: TargetTriple,
     extra_filename: String,
     hash: Svh,
+    disambiguator: CrateDisambiguator,
     stable_crate_id: StableCrateId,
     panic_strategy: PanicStrategy,
     edition: Edition,