3 files changed, 75 insertions, 108 deletions

diff --git a/crates/base_db/src/input.rs b/crates/base_db/src/input.rs
index 31907ed98..98ba372ad 100644
--- a/crates/base_db/src/input.rs
+++ b/crates/base_db/src/input.rs
@@ -225,7 +225,10 @@ impl CrateGraph {
         to: CrateId,
     ) -> Result<(), CyclicDependenciesError> {
         if self.dfs_find(from, to, &mut FxHashSet::default()) {
-            return Err(CyclicDependenciesError);
+            return Err(CyclicDependenciesError {
+                from: (from, self[from].display_name.clone()),
+                to: (to, self[to].display_name.clone()),
+            });
         }
         self.arena.get_mut(&from).unwrap().add_dep(name, to);
         Ok(())
@@ -421,7 +424,20 @@ impl fmt::Display for ParseEditionError {
 impl std::error::Error for ParseEditionError {}
 
 #[derive(Debug)]
-pub struct CyclicDependenciesError;
+pub struct CyclicDependenciesError {
+    from: (CrateId, Option<CrateDisplayName>),
+    to: (CrateId, Option<CrateDisplayName>),
+}
+
+impl fmt::Display for CyclicDependenciesError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let render = |(id, name): &(CrateId, Option<CrateDisplayName>)| match name {
+            Some(it) => format!("{}({:?})", it, id),
+            None => format!("{:?}", id),
+        };
+        write!(f, "cyclic deps: {} -> {}", render(&self.from), render(&self.to))
+    }
+}
 
 #[cfg(test)]
 mod tests {
diff --git a/crates/project_model/src/sysroot.rs b/crates/project_model/src/sysroot.rs
index b0e8863f6..f0a43eaf6 100644
--- a/crates/project_model/src/sysroot.rs
+++ b/crates/project_model/src/sysroot.rs
@@ -37,7 +37,7 @@ impl Sysroot {
     pub fn public_deps(&self) -> impl Iterator<Item = (&'static str, SysrootCrate)> + '_ {
         // core is added as a dependency before std in order to
         // mimic rustcs dependency order
-        vec!["core", "alloc", "std"].into_iter().filter_map(move |it| Some((it, self.by_name(it)?)))
+        ["core", "alloc", "std"].iter().filter_map(move |&it| Some((it, self.by_name(it)?)))
     }
 
     pub fn proc_macro(&self) -> Option<SysrootCrate> {
diff --git a/crates/project_model/src/workspace.rs b/crates/project_model/src/workspace.rs
index 9ebb0a811..dbf1dc5bf 100644
--- a/crates/project_model/src/workspace.rs
+++ b/crates/project_model/src/workspace.rs
@@ -12,8 +12,8 @@ use proc_macro_api::ProcMacroClient;
 use rustc_hash::{FxHashMap, FxHashSet};
 
 use crate::{
-    cargo_workspace, cfg_flag::CfgFlag, utf8_stdout, CargoConfig, CargoWorkspace, ProjectJson,
-    ProjectManifest, Sysroot, TargetKind,
+    cargo_workspace, cfg_flag::CfgFlag, sysroot::SysrootCrate, utf8_stdout, CargoConfig,
+    CargoWorkspace, ProjectJson, ProjectManifest, Sysroot, TargetKind,
 };
 
 /// `PackageRoot` describes a package root folder.
@@ -70,12 +70,8 @@ impl ProjectWorkspace {
                     format!("Failed to deserialize json file {}", project_json.display())
                 })?;
                 let project_location = project_json.parent().unwrap().to_path_buf();
-                let project = ProjectJson::new(&project_location, data);
-                let sysroot = match &project.sysroot_src {
-                    Some(path) => Some(Sysroot::load(path)?),
-                    None => None,
-                };
-                ProjectWorkspace::Json { project, sysroot }
+                let project_json = ProjectJson::new(&project_location, data);
+                ProjectWorkspace::load_inline(project_json)?
             }
             ProjectManifest::CargoToml(cargo_toml) => {
                 let cargo_version = utf8_stdout({
@@ -150,43 +146,38 @@ impl ProjectWorkspace {
                     })
                 }))
                 .collect::<Vec<_>>(),
-            ProjectWorkspace::Cargo { cargo, sysroot, rustc } => {
-                let roots = cargo
-                    .packages()
-                    .map(|pkg| {
-                        let is_member = cargo[pkg].is_member;
-                        let pkg_root = cargo[pkg].root().to_path_buf();
-
-                        let mut include = vec![pkg_root.clone()];
-                        include.extend(cargo[pkg].out_dir.clone());
-
-                        let mut exclude = vec![pkg_root.join(".git")];
-                        if is_member {
-                            exclude.push(pkg_root.join("target"));
-                        } else {
-                            exclude.push(pkg_root.join("tests"));
-                            exclude.push(pkg_root.join("examples"));
-                            exclude.push(pkg_root.join("benches"));
-                        }
-                        PackageRoot { is_member, include, exclude }
-                    })
-                    .chain(sysroot.crates().map(|krate| PackageRoot {
+            ProjectWorkspace::Cargo { cargo, sysroot, rustc } => cargo
+                .packages()
+                .map(|pkg| {
+                    let is_member = cargo[pkg].is_member;
+                    let pkg_root = cargo[pkg].root().to_path_buf();
+
+                    let mut include = vec![pkg_root.clone()];
+                    include.extend(cargo[pkg].out_dir.clone());
+
+                    let mut exclude = vec![pkg_root.join(".git")];
+                    if is_member {
+                        exclude.push(pkg_root.join("target"));
+                    } else {
+                        exclude.push(pkg_root.join("tests"));
+                        exclude.push(pkg_root.join("examples"));
+                        exclude.push(pkg_root.join("benches"));
+                    }
+                    PackageRoot { is_member, include, exclude }
+                })
+                .chain(sysroot.crates().map(|krate| PackageRoot {
+                    is_member: false,
+                    include: vec![sysroot[krate].root_dir().to_path_buf()],
+                    exclude: Vec::new(),
+                }))
+                .chain(rustc.into_iter().flat_map(|rustc| {
+                    rustc.packages().map(move |krate| PackageRoot {
                         is_member: false,
-                        include: vec![sysroot[krate].root_dir().to_path_buf()],
+                        include: vec![rustc[krate].root().to_path_buf()],
                         exclude: Vec::new(),
-                    }));
-                if let Some(rustc_packages) = rustc {
-                    roots
-                        .chain(rustc_packages.packages().map(|krate| PackageRoot {
-                            is_member: false,
-                            include: vec![rustc_packages[krate].root().to_path_buf()],
-                            exclude: Vec::new(),
-                        }))
-                        .collect()
-                } else {
-                    roots.collect()
-                }
-            }
+                    })
+                }))
+                .collect(),
         }
     }
 
@@ -258,18 +249,14 @@ impl ProjectWorkspace {
                     if let Some(&from) = crates.get(&from) {
                         if let Some((public_deps, _proc_macro)) = &sysroot_dps {
                             for (name, to) in public_deps.iter() {
-                                if let Err(_) = crate_graph.add_dep(from, name.clone(), *to) {
-                                    log::error!("cyclic dependency on {} for {:?}", name, from)
-                                }
+                                add_dep(&mut crate_graph, from, name.clone(), *to)
                             }
                         }
 
                         for dep in &krate.deps {
                             let to_crate_id = dep.crate_id;
                             if let Some(&to) = crates.get(&to_crate_id) {
-                                if let Err(_) = crate_graph.add_dep(from, dep.name.clone(), to) {
-                                    log::error!("cyclic dependency {:?} -> {:?}", from, to);
-                                }
+                                add_dep(&mut crate_graph, from, dep.name.clone(), to)
                             }
                         }
                     }
@@ -308,16 +295,12 @@ impl ProjectWorkspace {
                             }
                             if cargo[tgt].is_proc_macro {
                                 if let Some(proc_macro) = libproc_macro {
-                                    if let Err(_) = crate_graph.add_dep(
+                                    add_dep(
+                                        &mut crate_graph,
                                         crate_id,
                                         CrateName::new("proc_macro").unwrap(),
                                         proc_macro,
-                                    ) {
-                                        log::error!(
-                                            "cyclic dependency on proc_macro for {}",
-                                            &cargo[pkg].name
-                                        )
-                                    }
+                                    );
                                 }
                             }
 
@@ -332,21 +315,12 @@ impl ProjectWorkspace {
                             // cargo metadata does not do any normalization,
                             // so we do it ourselves currently
                             let name = CrateName::normalize_dashes(&name);
-                            if to != from && crate_graph.add_dep(from, name, to).is_err() {
-                                log::error!(
-                                    "cyclic dependency between targets of {}",
-                                    &cargo[pkg].name
-                                )
+                            if to != from {
+                                add_dep(&mut crate_graph, from, name, to);
                             }
                         }
                         for (name, krate) in public_deps.iter() {
-                            if let Err(_) = crate_graph.add_dep(from, name.clone(), *krate) {
-                                log::error!(
-                                    "cyclic dependency on {} for {}",
-                                    name,
-                                    &cargo[pkg].name
-                                )
-                            }
+                            add_dep(&mut crate_graph, from, name.clone(), *krate);
                         }
                     }
                 }
@@ -358,13 +332,7 @@ impl ProjectWorkspace {
                         let name = CrateName::new(&dep.name).unwrap();
                         if let Some(&to) = pkg_to_lib_crate.get(&dep.pkg) {
                             for &from in pkg_crates.get(&pkg).into_iter().flatten() {
-                                if let Err(_) = crate_graph.add_dep(from, name.clone(), to) {
-                                    log::error!(
-                                        "cyclic dependency {} -> {}",
-                                        &cargo[pkg].name,
-                                        &cargo[dep.pkg].name
-                                    )
-                                }
+                                add_dep(&mut crate_graph, from, name.clone(), to)
                             }
                         }
                     }
@@ -400,15 +368,7 @@ impl ProjectWorkspace {
                                 pkg_to_lib_crate.insert(pkg, crate_id);
                                 // Add dependencies on the core / std / alloc for rustc
                                 for (name, krate) in public_deps.iter() {
-                                    if let Err(_) =
-                                        crate_graph.add_dep(crate_id, name.clone(), *krate)
-                                    {
-                                        log::error!(
-                                            "cyclic dependency on {} for {}",
-                                            name,
-                                            &cargo[pkg].name
-                                        )
-                                    }
+                                    add_dep(&mut crate_graph, crate_id, name.clone(), *krate);
                                 }
                                 rustc_pkg_crates.entry(pkg).or_insert_with(Vec::new).push(crate_id);
                             }
@@ -421,13 +381,7 @@ impl ProjectWorkspace {
                             let name = CrateName::new(&dep.name).unwrap();
                             if let Some(&to) = pkg_to_lib_crate.get(&dep.pkg) {
                                 for &from in rustc_pkg_crates.get(&pkg).into_iter().flatten() {
-                                    if let Err(_) = crate_graph.add_dep(from, name.clone(), to) {
-                                        log::error!(
-                                            "cyclic dependency {} -> {}",
-                                            &rustc_workspace[pkg].name,
-                                            &rustc_workspace[dep.pkg].name
-                                        )
-                                    }
+                                    add_dep(&mut crate_graph, from, name.clone(), to);
                                 }
                             }
                         }
@@ -443,13 +397,7 @@ impl ProjectWorkspace {
                                     continue;
                                 }
                                 for &from in pkg_crates.get(&pkg).into_iter().flatten() {
-                                    if let Err(_) = crate_graph.add_dep(from, name.clone(), to) {
-                                        log::error!(
-                                            "cyclic dependency {} -> {}",
-                                            &cargo[pkg].name,
-                                            &rustc_workspace[dep].name
-                                        )
-                                    }
+                                    add_dep(&mut crate_graph, from, name.clone(), to);
                                 }
                             }
                         }
@@ -520,19 +468,18 @@ fn sysroot_to_crate_graph(
 ) -> (Vec<(CrateName, CrateId)>, Option<CrateId>) {
     let mut cfg_options = CfgOptions::default();
     cfg_options.extend(get_rustc_cfg_options(target));
-    let sysroot_crates: FxHashMap<_, _> = sysroot
+    let sysroot_crates: FxHashMap<SysrootCrate, CrateId> = sysroot
         .crates()
         .filter_map(|krate| {
             let file_id = load(&sysroot[krate].root)?;
 
             let env = Env::default();
             let proc_macro = vec![];
-            let name = CrateName::new(&sysroot[krate].name)
-                .expect("Sysroot crates' names do not contain dashes");
+            let display_name = CrateDisplayName::from_canonical_name(sysroot[krate].name.clone());
             let crate_id = crate_graph.add_crate_root(
                 file_id,
                 Edition::Edition2018,
-                Some(name.into()),
+                Some(display_name),
                 cfg_options.clone(),
                 env,
                 proc_macro,
@@ -545,9 +492,7 @@ fn sysroot_to_crate_graph(
         for &to in sysroot[from].deps.iter() {
             let name = CrateName::new(&sysroot[to].name).unwrap();
             if let (Some(&from), Some(&to)) = (sysroot_crates.get(&from), sysroot_crates.get(&to)) {
-                if let Err(_) = crate_graph.add_dep(from, name, to) {
-                    log::error!("cyclic dependency between sysroot crates")
-                }
+                add_dep(crate_graph, from, name, to);
             }
         }
     }
@@ -588,3 +533,9 @@ fn get_rustc_cfg_options(target: Option<&str>) -> Vec<CfgFlag> {
 
     res
 }
+
+fn add_dep(graph: &mut CrateGraph, from: CrateId, name: CrateName, to: CrateId) {
+    if let Err(err) = graph.add_dep(from, name, to) {
+        log::error!("{}", err)
+    }
+}