incr.comp.: Hash more pieces of crate metadata to detect changes there.

src/librustc/dep_graph/dep_node.rs

@@ -51,6 +51,9 @@ pub enum DepNode<D: Clone + Debug> {
     // in an extern crate.
     MetaData(D),
 
+    // Represents some piece of metadata global to its crate.
+    GlobalMetaData(D, GlobalMetaDataKind),
+
     // Represents some artifact that we save to disk. Note that these
     // do not have a def-id as part of their identifier.
     WorkProduct(Arc<WorkProductId>),
@@ -79,7 +82,6 @@ pub enum DepNode<D: Clone + Debug> {
     MirKeys,
     LateLintCheck,
     TransCrateItem(D),
-    TransInlinedItem(D),
     TransWriteMetadata,
     CrateVariances,
 
@@ -157,6 +159,7 @@ pub enum DepNode<D: Clone + Debug> {
     DefSpan(D),
     Stability(D),
     Deprecation(D),
+    FileMap(D, Arc<String>),
 }
 
 impl<D: Clone + Debug> DepNode<D> {
@@ -234,7 +237,6 @@ impl<D: Clone + Debug> DepNode<D> {
             RegionMaps(ref d) => op(d).map(RegionMaps),
             RvalueCheck(ref d) => op(d).map(RvalueCheck),
             TransCrateItem(ref d) => op(d).map(TransCrateItem),
-            TransInlinedItem(ref d) => op(d).map(TransInlinedItem),
             AssociatedItems(ref d) => op(d).map(AssociatedItems),
             ItemSignature(ref d) => op(d).map(ItemSignature),
             ItemVariances(ref d) => op(d).map(ItemVariances),
@@ -271,6 +273,8 @@ impl<D: Clone + Debug> DepNode<D> {
             DefSpan(ref d) => op(d).map(DefSpan),
             Stability(ref d) => op(d).map(Stability),
             Deprecation(ref d) => op(d).map(Deprecation),
+            GlobalMetaData(ref d, kind) => op(d).map(|d| GlobalMetaData(d, kind)),
+            FileMap(ref d, ref file_name) => op(d).map(|d| FileMap(d, file_name.clone())),
         }
     }
 }
@@ -282,3 +286,16 @@ impl<D: Clone + Debug> DepNode<D> {
 /// them even in the absence of a tcx.)
 #[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, RustcEncodable, RustcDecodable)]
 pub struct WorkProductId(pub String);
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, RustcEncodable, RustcDecodable)]
+pub enum GlobalMetaDataKind {
+    Krate,
+    CrateDeps,
+    DylibDependencyFormats,
+    LangItems,
+    LangItemsMissing,
+    NativeLibraries,
+    CodeMap,
+    Impls,
+    ExportedSymbols,
+}

src/librustc/dep_graph/mod.rs

@@ -22,6 +22,7 @@ mod thread;
 pub use self::dep_tracking_map::{DepTrackingMap, DepTrackingMapConfig};
 pub use self::dep_node::DepNode;
 pub use self::dep_node::WorkProductId;
+pub use self::dep_node::GlobalMetaDataKind;
 pub use self::graph::DepGraph;
 pub use self::graph::WorkProduct;
 pub use self::query::DepGraphQuery;

src/librustc/hir/svh.rs

@@ -66,3 +66,7 @@ impl Decodable for Svh {
          .map(Svh::new)
     }
 }
+
+impl_stable_hash_for!(struct Svh {
+    hash
+});

src/librustc/ich/caching_codemap_view.rs

@@ -8,10 +8,14 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use ty::TyCtxt;
+use dep_graph::{DepGraph, DepNode};
+use hir::def_id::{DefId, CrateNum, CRATE_DEF_INDEX};
+use rustc_data_structures::bitvec::BitVector;
 use std::rc::Rc;
+use std::sync::Arc;
 use syntax::codemap::CodeMap;
 use syntax_pos::{BytePos, FileMap};
+use ty::TyCtxt;
 
 #[derive(Clone)]
 struct CacheEntry {
@@ -20,30 +24,37 @@ struct CacheEntry {
     line_start: BytePos,
     line_end: BytePos,
     file: Rc<FileMap>,
+    file_index: usize,
 }
 
 pub struct CachingCodemapView<'tcx> {
     codemap: &'tcx CodeMap,
     line_cache: [CacheEntry; 3],
     time_stamp: usize,
+    dep_graph: DepGraph,
+    dep_tracking_reads: BitVector,
 }
 
 impl<'tcx> CachingCodemapView<'tcx> {
     pub fn new<'a>(tcx: TyCtxt<'a, 'tcx, 'tcx>) -> CachingCodemapView<'tcx> {
         let codemap = tcx.sess.codemap();
-        let first_file = codemap.files.borrow()[0].clone();
+        let files = codemap.files_untracked();
+        let first_file = files[0].clone();
         let entry = CacheEntry {
             time_stamp: 0,
             line_number: 0,
             line_start: BytePos(0),
             line_end: BytePos(0),
             file: first_file,
+            file_index: 0,
         };
 
         CachingCodemapView {
+            dep_graph: tcx.dep_graph.clone(),
             codemap: codemap,
             line_cache: [entry.clone(), entry.clone(), entry.clone()],
             time_stamp: 0,
+            dep_tracking_reads: BitVector::new(files.len()),
         }
     }
 
@@ -56,6 +67,10 @@ impl<'tcx> CachingCodemapView<'tcx> {
         for cache_entry in self.line_cache.iter_mut() {
             if pos >= cache_entry.line_start && pos < cache_entry.line_end {
                 cache_entry.time_stamp = self.time_stamp;
+                if self.dep_tracking_reads.insert(cache_entry.file_index) {
+                    self.dep_graph.read(dep_node(cache_entry));
+                }
+
                 return Some((cache_entry.file.clone(),
                              cache_entry.line_number,
                              pos - cache_entry.line_start));
@@ -75,14 +90,15 @@ impl<'tcx> CachingCodemapView<'tcx> {
         // If the entry doesn't point to the correct file, fix it up
         if pos < cache_entry.file.start_pos || pos >= cache_entry.file.end_pos {
             let file_valid;
-            let files = self.codemap.files.borrow();
+            let files = self.codemap.files_untracked();
 
             if files.len() > 0 {
                 let file_index = self.codemap.lookup_filemap_idx(pos);
                 let file = files[file_index].clone();
 
                 if pos >= file.start_pos && pos < file.end_pos {
                     cache_entry.file = file;
+                    cache_entry.file_index = file_index;
                     file_valid = true;
                 } else {
                     file_valid = false;
@@ -104,8 +120,21 @@ impl<'tcx> CachingCodemapView<'tcx> {
         cache_entry.line_end = line_bounds.1;
         cache_entry.time_stamp = self.time_stamp;
 
+        if self.dep_tracking_reads.insert(cache_entry.file_index) {
+            self.dep_graph.read(dep_node(cache_entry));
+        }
+
         return Some((cache_entry.file.clone(),
                      cache_entry.line_number,
                      pos - cache_entry.line_start));
     }
 }
+
+fn dep_node(cache_entry: &CacheEntry) -> DepNode<DefId> {
+    let def_id = DefId {
+        krate: CrateNum::from_u32(cache_entry.file.crate_of_origin),
+        index: CRATE_DEF_INDEX,
+    };
+    let name = Arc::new(cache_entry.file.name.clone());
+    DepNode::FileMap(def_id, name)
+}

src/librustc/ich/impls_cstore.rs

@@ -0,0 +1,40 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! This module contains `HashStable` implementations for various data types
+//! from rustc::middle::cstore in no particular order.
+
+use middle;
+
+impl_stable_hash_for!(enum middle::cstore::DepKind {
+    UnexportedMacrosOnly,
+    MacrosOnly,
+    Implicit,
+    Explicit
+});
+
+impl_stable_hash_for!(enum middle::cstore::NativeLibraryKind {
+    NativeStatic,
+    NativeStaticNobundle,
+    NativeFramework,
+    NativeUnknown
+});
+
+impl_stable_hash_for!(struct middle::cstore::NativeLibrary {
+    kind,
+    name,
+    cfg,
+    foreign_items
+});
+
+impl_stable_hash_for!(enum middle::cstore::LinkagePreference {
+    RequireDynamic,
+    RequireStatic
+});

src/librustc/ich/impls_hir.rs

@@ -1120,3 +1120,11 @@ impl_stable_hash_for!(struct hir::def::Export {
     def,
     span
 });
+
+impl<'a, 'tcx> HashStable<StableHashingContext<'a, 'tcx>> for ::middle::lang_items::LangItem {
+    fn hash_stable<W: StableHasherResult>(&self,
+                                          _: &mut StableHashingContext<'a, 'tcx>,
+                                          hasher: &mut StableHasher<W>) {
+        ::std::hash::Hash::hash(self, hasher);
+    }
+}

src/librustc/ich/impls_syntax.rs

@@ -19,7 +19,9 @@ use std::mem;
 use syntax::ast;
 use syntax::parse::token;
 use syntax::tokenstream;
-use syntax_pos::Span;
+use syntax_pos::{Span, FileMap};
+
+use hir::def_id::{DefId, CrateNum, CRATE_DEF_INDEX};
 
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher,
                                            StableHasherResult};
@@ -299,3 +301,79 @@ fn hash_token<'a, 'tcx, W: StableHasherResult>(token: &token::Token,
         token::Token::Shebang(val) => val.hash_stable(hcx, hasher),
     }
 }
+
+impl_stable_hash_for_spanned!(::syntax::ast::NestedMetaItemKind);
+
+impl_stable_hash_for!(enum ::syntax::ast::NestedMetaItemKind {
+    MetaItem(meta_item),
+    Literal(lit)
+});
+
+impl_stable_hash_for!(struct ::syntax::ast::MetaItem {
+    name,
+    node,
+    span
+});
+
+impl_stable_hash_for!(enum ::syntax::ast::MetaItemKind {
+    Word,
+    List(nested_items),
+    NameValue(lit)
+});
+
+impl<'a, 'tcx> HashStable<StableHashingContext<'a, 'tcx>> for FileMap {
+    fn hash_stable<W: StableHasherResult>(&self,
+                                          hcx: &mut StableHashingContext<'a, 'tcx>,
+                                          hasher: &mut StableHasher<W>) {
+        let FileMap {
+            ref name,
+            name_was_remapped,
+            crate_of_origin,
+            // Do not hash the source as it is not encoded
+            src: _,
+            start_pos,
+            end_pos: _,
+            ref lines,
+            ref multibyte_chars,
+        } = *self;
+
+        name.hash_stable(hcx, hasher);
+        name_was_remapped.hash_stable(hcx, hasher);
+
+        DefId {
+            krate: CrateNum::from_u32(crate_of_origin),
+            index: CRATE_DEF_INDEX,
+        }.hash_stable(hcx, hasher);
+
+        // We only hash the relative position within this filemap
+        let lines = lines.borrow();
+        lines.len().hash_stable(hcx, hasher);
+        for &line in lines.iter() {
+            stable_byte_pos(line, start_pos).hash_stable(hcx, hasher);
+        }
+
+        // We only hash the relative position within this filemap
+        let multibyte_chars = multibyte_chars.borrow();
+        multibyte_chars.len().hash_stable(hcx, hasher);
+        for &char_pos in multibyte_chars.iter() {
+            stable_multibyte_char(char_pos, start_pos).hash_stable(hcx, hasher);
+        }
+    }
+}
+
+fn stable_byte_pos(pos: ::syntax_pos::BytePos,
+                   filemap_start: ::syntax_pos::BytePos)
+                   -> u32 {
+    pos.0 - filemap_start.0
+}
+
+fn stable_multibyte_char(mbc: ::syntax_pos::MultiByteChar,
+                         filemap_start: ::syntax_pos::BytePos)
+                         -> (u32, u32) {
+    let ::syntax_pos::MultiByteChar {
+        pos,
+        bytes,
+    } = mbc;
+
+    (pos.0 - filemap_start.0, bytes as u32)
+}

src/librustc/ich/mod.rs

@@ -19,6 +19,7 @@ mod caching_codemap_view;
 mod hcx;
 
 mod impls_const_math;
+mod impls_cstore;
 mod impls_hir;
 mod impls_mir;
 mod impls_ty;

src/librustc/middle/cstore.rs

@@ -23,6 +23,7 @@
 // probably get a better home if someone can find one.
 
 use hir::def;
+use dep_graph::DepNode;
 use hir::def_id::{CrateNum, DefId, DefIndex};
 use hir::map as hir_map;
 use hir::map::definitions::{Definitions, DefKey, DisambiguatedDefPathData};
@@ -161,7 +162,16 @@ pub struct ExternCrate {
 
 pub struct EncodedMetadata {
     pub raw_data: Vec<u8>,
-    pub hashes: Vec<EncodedMetadataHash>,
+    pub hashes: EncodedMetadataHashes,
+}
+
+impl EncodedMetadata {
+    pub fn new() -> EncodedMetadata {
+        EncodedMetadata {
+            raw_data: Vec::new(),
+            hashes: EncodedMetadataHashes::new(),
+        }
+    }
 }
 
 /// The hash for some metadata that (when saving) will be exported
@@ -173,6 +183,24 @@ pub struct EncodedMetadataHash {
     pub hash: ich::Fingerprint,
 }
 
+/// The hash for some metadata that (when saving) will be exported
+/// from this crate, or which (when importing) was exported by an
+/// upstream crate.
+#[derive(Debug, RustcEncodable, RustcDecodable, Clone)]
+pub struct EncodedMetadataHashes {
+    pub entry_hashes: Vec<EncodedMetadataHash>,
+    pub global_hashes: Vec<(DepNode<()>, ich::Fingerprint)>,
+}
+
+impl EncodedMetadataHashes {
+    pub fn new() -> EncodedMetadataHashes {
+        EncodedMetadataHashes {
+            entry_hashes: Vec::new(),
+            global_hashes: Vec::new(),
+        }
+    }
+}
+
 /// A store of Rust crates, through with their metadata
 /// can be accessed.
 pub trait CrateStore {