Rollup merge of #45018 - michaelwoerister:fix-dep-node-debug-recursion, r=eddyb

incr.comp.: Fix infinite recursion in Debug implementation of DepNode

Small bug fix. Depends on #44901 to land first.

src/librustc/dep_graph/dep_node.rs

@@ -356,7 +356,7 @@ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         ::ty::tls::with_opt(|opt_tcx| {
             if let Some(tcx) = opt_tcx {
                 if let Some(def_id) = self.extract_def_id(tcx) {
-                    write!(f, "{}", tcx.def_path(def_id).to_string(tcx))?;
+                    write!(f, "{}", tcx.def_path_debug_str(def_id))?;
                 } else if let Some(ref s) = tcx.dep_graph.dep_node_debug_str(*self) {
                     write!(f, "{}", s)?;
                 } else {
@@ -700,8 +700,8 @@ fn to_debug_str(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> String {
         let (def_id_0, def_id_1) = *self;
 
         format!("({}, {})",
-                tcx.def_path(def_id_0).to_string(tcx),
-                tcx.def_path(def_id_1).to_string(tcx))
+                tcx.def_path_debug_str(def_id_0),
+                tcx.def_path_debug_str(def_id_1))
     }
 }
 

src/librustc/dep_graph/graph.rs

@@ -577,7 +577,7 @@ pub fn try_mark_green(&self,
                       "DepGraph::try_mark_green() - Duplicate DepNodeColor \
                       insertion for {:?}", dep_node);
 
-        debug!("try_mark_green({:?}) - END - successfully marked as green", dep_node.kind);
+        debug!("try_mark_green({:?}) - END - successfully marked as green", dep_node);
         Some(dep_node_index)
     }
 

src/librustc/hir/def_id.rs

@@ -197,12 +197,12 @@ pub struct DefId {
 
 impl fmt::Debug for DefId {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "DefId {{ krate: {:?}, node: {:?}",
+        write!(f, "DefId {{ krate: {:?}, index: {:?}",
                self.krate, self.index)?;
 
         ty::tls::with_opt(|opt_tcx| {
             if let Some(tcx) = opt_tcx {
-                write!(f, " => {}", tcx.def_path(*self).to_string(tcx))?;
+                write!(f, " => {}", tcx.def_path_debug_str(*self))?;
             }
             Ok(())
         })?;

src/librustc/hir/map/definitions.rs

@@ -27,7 +27,6 @@
 use syntax::ast;
 use syntax::ext::hygiene::Mark;
 use syntax::symbol::{Symbol, InternedString};
-use ty::TyCtxt;
 use util::nodemap::NodeMap;
 
 /// The DefPathTable maps DefIndexes to DefKeys and vice versa.
@@ -296,26 +295,6 @@ pub fn make<FN>(krate: CrateNum,
         DefPath { data: data, krate: krate }
     }
 
-    pub fn to_string(&self, tcx: TyCtxt) -> String {
-        let mut s = String::with_capacity(self.data.len() * 16);
-
-        s.push_str(&tcx.original_crate_name(self.krate).as_str());
-        s.push_str("/");
-        // Don't print the whole crate disambiguator. That's just annoying in
-        // debug output.
-        s.push_str(&tcx.crate_disambiguator(self.krate).as_str()[..7]);
-
-        for component in &self.data {
-            write!(s,
-                   "::{}[{}]",
-                   component.data.as_interned_str(),
-                   component.disambiguator)
-                .unwrap();
-        }
-
-        s
-    }
-
     /// Returns a string representation of the DefPath without
     /// the crate-prefix. This method is useful if you don't have
     /// a TyCtxt available.

src/librustc/ty/context.rs

@@ -1252,6 +1252,27 @@ pub fn def_path_hash(self, def_id: DefId) -> hir_map::DefPathHash {
         }
     }
 
+    pub fn def_path_debug_str(self, def_id: DefId) -> String {
+        // We are explicitly not going through queries here in order to get
+        // crate name and disambiguator since this code is called from debug!()
+        // statements within the query system and we'd run into endless
+        // recursion otherwise.
+        let (crate_name, crate_disambiguator) = if def_id.is_local() {
+            (self.crate_name.clone(),
+             self.sess.local_crate_disambiguator())
+        } else {
+            (self.cstore.crate_name_untracked(def_id.krate),
+             self.cstore.crate_disambiguator_untracked(def_id.krate))
+        };
+
+        format!("{}[{}]{}",
+                crate_name,
+                // Don't print the whole crate disambiguator. That's just
+                // annoying in debug output.
+                &(crate_disambiguator.as_str())[..4],
+                self.def_path(def_id).to_string_no_crate())
+    }
+
     pub fn metadata_encoding_version(self) -> Vec<u8> {
         self.cstore.metadata_encoding_version().to_vec()
     }

src/test/mir-opt/validate_1.rs

@@ -30,7 +30,7 @@ fn main() {
 // END RUST SOURCE
 // START rustc.node12.EraseRegions.after.mir
 //     bb0: {
-//         Validate(Acquire, [_1: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(0:5) => validate_1/8cd878b::{{impl}}[0]::foo[0] }, BrAnon(0)) Test, _2: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(0:5) => validate_1/8cd878b::{{impl}}[0]::foo[0] }, BrAnon(1)) mut i32]);
+//         Validate(Acquire, [_1: &ReFree(DefId { krate: CrateNum(0), index: DefIndex(0:5) => validate_1[8cd8]::{{impl}}[0]::foo[0] }, BrAnon(0)) Test, _2: &ReFree(DefId { krate: CrateNum(0), index: DefIndex(0:5) => validate_1[8cd8]::{{impl}}[0]::foo[0] }, BrAnon(1)) mut i32]);
 //         return;
 //     }
 // END rustc.node12.EraseRegions.after.mir
@@ -57,7 +57,7 @@ fn main() {
 // START rustc.node50.EraseRegions.after.mir
 // fn main::{{closure}}(_1: &ReErased [closure@NodeId(50)], _2: &ReErased mut i32) -> i32 {
 //     bb0: {
-//         Validate(Acquire, [_1: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(1:11) => validate_1/8cd878b::main[0]::{{closure}}[0] }, "BrEnv") [closure@NodeId(50)], _2: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(1:11) => validate_1/8cd878b::main[0]::{{closure}}[0] }, BrAnon(1)) mut i32]);
+//         Validate(Acquire, [_1: &ReFree(DefId { krate: CrateNum(0), index: DefIndex(1:11) => validate_1[8cd8]::main[0]::{{closure}}[0] }, "BrEnv") [closure@NodeId(50)], _2: &ReFree(DefId { krate: CrateNum(0), index: DefIndex(1:11) => validate_1[8cd8]::main[0]::{{closure}}[0] }, BrAnon(1)) mut i32]);
 //         StorageLive(_3);
 //         _3 = _2;
 //         StorageLive(_4);

src/test/mir-opt/validate_4.rs

@@ -48,8 +48,8 @@ fn main() {
 // START rustc.node22.EraseRegions.after.mir
 // fn write_42::{{closure}}(_1: &ReErased [closure@NodeId(22)], _2: *mut i32) -> () {
 //     bb0: {
-//         Validate(Acquire, [_1: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(1:9) => validate_4/8cd878b::write_42[0]::{{closure}}[0] }, "BrEnv") [closure@NodeId(22)], _2: *mut i32]);
-//         Validate(Release, [_1: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(1:9) => validate_4/8cd878b::write_42[0]::{{closure}}[0] }, "BrEnv") [closure@NodeId(22)], _2: *mut i32]);
+//         Validate(Acquire, [_1: &ReFree(DefId { krate: CrateNum(0), index: DefIndex(1:9) => validate_4[8cd8]::write_42[0]::{{closure}}[0] }, "BrEnv") [closure@NodeId(22)], _2: *mut i32]);
+//         Validate(Release, [_1: &ReFree(DefId { krate: CrateNum(0), index: DefIndex(1:9) => validate_4[8cd8]::write_42[0]::{{closure}}[0] }, "BrEnv") [closure@NodeId(22)], _2: *mut i32]);
 //         StorageLive(_3);
 //         _3 = _2;
 //         (*_3) = const 23i32;
@@ -61,8 +61,8 @@ fn main() {
 // START rustc.node31.EraseRegions.after.mir
 // fn test(_1: &ReErased mut i32) -> () {
 //     bb0: {
-//         Validate(Acquire, [_1: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(0:4) => validate_4/8cd878b::test[0] }, BrAnon(0)) mut i32]);
-//         Validate(Release, [_1: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(0:4) => validate_4/8cd878b::test[0] }, BrAnon(0)) mut i32]);
+//         Validate(Acquire, [_1: &ReFree(DefId { krate: CrateNum(0), index: DefIndex(0:4) => validate_4[8cd8]::test[0] }, BrAnon(0)) mut i32]);
+//         Validate(Release, [_1: &ReFree(DefId { krate: CrateNum(0), index: DefIndex(0:4) => validate_4[8cd8]::test[0] }, BrAnon(0)) mut i32]);
 //         _3 = const write_42(_4) -> bb1;
 //     }
 //     bb1: {
@@ -74,8 +74,8 @@ fn main() {
 // START rustc.node60.EraseRegions.after.mir
 // fn main::{{closure}}(_1: &ReErased [closure@NodeId(60)], _2: &ReErased mut i32) -> bool {
 //     bb0: {
-//         Validate(Acquire, [_1: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(1:10) => validate_4/8cd878b::main[0]::{{closure}}[0] }, "BrEnv") [closure@NodeId(60)], _2: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(1:10) => validate_4/8cd878b::main[0]::{{closure}}[0] }, BrAnon(1)) mut i32]);
-//         Validate(Release, [_1: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(1:10) => validate_4/8cd878b::main[0]::{{closure}}[0] }, "BrEnv") [closure@NodeId(60)], _2: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(1:10) => validate_4/8cd878b::main[0]::{{closure}}[0] }, BrAnon(1)) mut i32]);
+//         Validate(Acquire, [_1: &ReFree(DefId { krate: CrateNum(0), index: DefIndex(1:10) => validate_4[8cd8]::main[0]::{{closure}}[0] }, "BrEnv") [closure@NodeId(60)], _2: &ReFree(DefId { krate: CrateNum(0), index: DefIndex(1:10) => validate_4[8cd8]::main[0]::{{closure}}[0] }, BrAnon(1)) mut i32]);
+//         Validate(Release, [_1: &ReFree(DefId { krate: CrateNum(0), index: DefIndex(1:10) => validate_4[8cd8]::main[0]::{{closure}}[0] }, "BrEnv") [closure@NodeId(60)], _2: &ReFree(DefId { krate: CrateNum(0), index: DefIndex(1:10) => validate_4[8cd8]::main[0]::{{closure}}[0] }, BrAnon(1)) mut i32]);
 //         StorageLive(_3);
 //         _0 = const write_42(_4) -> bb1;
 //     }

src/test/mir-opt/validate_5.rs

@@ -36,7 +36,7 @@ fn main() {
 // START rustc.node17.EraseRegions.after.mir
 // fn test(_1: &ReErased mut i32) -> () {
 //     bb0: {
-//         Validate(Acquire, [_1: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(0:4) => validate_5/8cd878b::test[0] }, BrAnon(0)) mut i32]);
+//         Validate(Acquire, [_1: &ReFree(DefId { krate: CrateNum(0), index: DefIndex(0:4) => validate_5[8cd8]::test[0] }, BrAnon(0)) mut i32]);
 //         Validate(Release, [_3: bool, _4: *mut i32]);
 //         _3 = const write_42(_4) -> bb1;
 //     }
@@ -45,7 +45,7 @@ fn main() {
 // START rustc.node46.EraseRegions.after.mir
 // fn main::{{closure}}(_1: &ReErased [closure@NodeId(46)], _2: &ReErased mut i32) -> bool {
 //     bb0: {
-//         Validate(Acquire, [_1: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(1:9) => validate_5/8cd878b::main[0]::{{closure}}[0] }, "BrEnv") [closure@NodeId(46)], _2: &ReFree(DefId { krate: CrateNum(0), node: DefIndex(1:9) => validate_5/8cd878b::main[0]::{{closure}}[0] }, BrAnon(1)) mut i32]);
+//         Validate(Acquire, [_1: &ReFree(DefId { krate: CrateNum(0), index: DefIndex(1:9) => validate_5[8cd8]::main[0]::{{closure}}[0] }, "BrEnv") [closure@NodeId(46)], _2: &ReFree(DefId { krate: CrateNum(0), index: DefIndex(1:9) => validate_5[8cd8]::main[0]::{{closure}}[0] }, BrAnon(1)) mut i32]);
 //         StorageLive(_3);
 //         _3 = _2;
 //         StorageLive(_4);