3 files changed, 143 insertions, 141 deletions

diff --git a/crates/project_model/src/lib.rs b/crates/project_model/src/lib.rs
index 2d65fc076..2d91939ce 100644
--- a/crates/project_model/src/lib.rs
+++ b/crates/project_model/src/lib.rs
@@ -39,11 +39,18 @@ pub enum ProjectWorkspace {
 impl fmt::Debug for ProjectWorkspace {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
-            ProjectWorkspace::Cargo { cargo, .. } => {
-                f.debug_struct("Cargo").field("n_packages", &cargo.packages().len()).finish()
-            }
+            ProjectWorkspace::Cargo { cargo, sysroot } => f
+                .debug_struct("Cargo")
+                .field("n_packages", &cargo.packages().len())
+                .field("n_sysroot_crates", &sysroot.crates().len())
+                .finish(),
             ProjectWorkspace::Json { project } => {
-                f.debug_struct("Json").field("n_crates", &project.crates.len()).finish()
+                let mut debug_struct = f.debug_struct("Json");
+                debug_struct.field("n_crates", &project.n_crates());
+                if let Some(sysroot) = &project.sysroot {
+                    debug_struct.field("n_sysroot_crates", &sysroot.crates().len());
+                }
+                debug_struct.finish()
             }
         }
     }
@@ -202,15 +209,21 @@ impl ProjectWorkspace {
     pub fn to_roots(&self) -> Vec<PackageRoot> {
         match self {
             ProjectWorkspace::Json { project } => project
-                .crates
-                .iter()
-                .map(|krate| PackageRoot {
+                .crates()
+                .map(|(_, krate)| PackageRoot {
                     is_member: krate.is_workspace_member,
                     include: krate.include.clone(),
                     exclude: krate.exclude.clone(),
                 })
                 .collect::<FxHashSet<_>>()
                 .into_iter()
+                .chain(project.sysroot.as_ref().into_iter().flat_map(|sysroot| {
+                    sysroot.crates().map(move |krate| PackageRoot {
+                        is_member: false,
+                        include: vec![sysroot[krate].root_dir().to_path_buf()],
+                        exclude: Vec::new(),
+                    })
+                }))
                 .collect::<Vec<_>>(),
             ProjectWorkspace::Cargo { cargo, sysroot } => cargo
                 .packages()
@@ -243,9 +256,8 @@ impl ProjectWorkspace {
     pub fn proc_macro_dylib_paths(&self) -> Vec<AbsPathBuf> {
         match self {
             ProjectWorkspace::Json { project } => project
-                .crates
-                .iter()
-                .filter_map(|krate| krate.proc_macro_dylib_path.as_ref())
+                .crates()
+                .filter_map(|(_, krate)| krate.proc_macro_dylib_path.as_ref())
                 .cloned()
                 .collect(),
             ProjectWorkspace::Cargo { cargo, sysroot: _sysroot } => cargo
@@ -258,7 +270,7 @@ impl ProjectWorkspace {
 
     pub fn n_packages(&self) -> usize {
         match self {
-            ProjectWorkspace::Json { project, .. } => project.crates.len(),
+            ProjectWorkspace::Json { project, .. } => project.n_crates(),
             ProjectWorkspace::Cargo { cargo, sysroot } => {
                 cargo.packages().len() + sysroot.crates().len()
             }
@@ -274,12 +286,15 @@ impl ProjectWorkspace {
         let mut crate_graph = CrateGraph::default();
         match self {
             ProjectWorkspace::Json { project } => {
+                let sysroot_dps = project
+                    .sysroot
+                    .as_ref()
+                    .map(|sysroot| sysroot_to_crate_graph(&mut crate_graph, sysroot, target, load));
+
                 let mut cfg_cache: FxHashMap<Option<&str>, Vec<CfgFlag>> = FxHashMap::default();
                 let crates: FxHashMap<_, _> = project
-                    .crates
-                    .iter()
-                    .enumerate()
-                    .filter_map(|(seq_index, krate)| {
+                    .crates()
+                    .filter_map(|(crate_id, krate)| {
                         let file_path = &krate.root_module;
                         let file_id = load(&file_path)?;
 
@@ -297,9 +312,8 @@ impl ProjectWorkspace {
                         let mut cfg_options = CfgOptions::default();
                         cfg_options.extend(target_cfgs.iter().chain(krate.cfg.iter()).cloned());
 
-                        // FIXME: No crate name in json definition such that we cannot add OUT_DIR to env
                         Some((
-                            CrateId(seq_index as u32),
+                            crate_id,
                             crate_graph.add_crate_root(
                                 file_id,
                                 krate.edition,
@@ -313,67 +327,33 @@ impl ProjectWorkspace {
                     })
                     .collect();
 
-                for (id, krate) in project.crates.iter().enumerate() {
-                    for dep in &krate.deps {
-                        let from_crate_id = CrateId(id as u32);
-                        let to_crate_id = dep.crate_id;
-                        if let (Some(&from), Some(&to)) =
-                            (crates.get(&from_crate_id), crates.get(&to_crate_id))
-                        {
-                            if crate_graph.add_dep(from, dep.name.clone(), to).is_err() {
-                                log::error!(
-                                    "cyclic dependency {:?} -> {:?}",
-                                    from_crate_id,
-                                    to_crate_id
-                                );
+                for (from, krate) in project.crates() {
+                    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)
+                                }
                             }
                         }
-                    }
-                }
-            }
-            ProjectWorkspace::Cargo { cargo, sysroot } => {
-                let mut cfg_options = CfgOptions::default();
-                cfg_options.extend(get_rustc_cfg_options(target));
-
-                let sysroot_crates: FxHashMap<_, _> = sysroot
-                    .crates()
-                    .filter_map(|krate| {
-                        let file_id = load(&sysroot[krate].root)?;
-
-                        let env = Env::default();
-                        let proc_macro = vec![];
-                        let name = sysroot[krate].name.clone();
-                        let crate_id = crate_graph.add_crate_root(
-                            file_id,
-                            Edition::Edition2018,
-                            Some(name),
-                            cfg_options.clone(),
-                            env,
-                            proc_macro,
-                        );
-                        Some((krate, crate_id))
-                    })
-                    .collect();
 
-                for from in sysroot.crates() {
-                    for &to in sysroot[from].deps.iter() {
-                        let name = &sysroot[to].name;
-                        if let (Some(&from), Some(&to)) =
-                            (sysroot_crates.get(&from), sysroot_crates.get(&to))
-                        {
-                            if crate_graph.add_dep(from, CrateName::new(name).unwrap(), to).is_err()
-                            {
-                                log::error!("cyclic dependency between sysroot crates")
+                        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);
+                                }
                             }
                         }
                     }
                 }
+            }
+            ProjectWorkspace::Cargo { cargo, sysroot } => {
+                let (public_deps, libproc_macro) =
+                    sysroot_to_crate_graph(&mut crate_graph, sysroot, target, load);
 
-                let libcore = sysroot.core().and_then(|it| sysroot_crates.get(&it).copied());
-                let liballoc = sysroot.alloc().and_then(|it| sysroot_crates.get(&it).copied());
-                let libstd = sysroot.std().and_then(|it| sysroot_crates.get(&it).copied());
-                let libproc_macro =
-                    sysroot.proc_macro().and_then(|it| sysroot_crates.get(&it).copied());
+                let mut cfg_options = CfgOptions::default();
+                cfg_options.extend(get_rustc_cfg_options(target));
 
                 let mut pkg_to_lib_crate = FxHashMap::default();
                 let mut pkg_crates = FxHashMap::default();
@@ -424,14 +404,11 @@ impl ProjectWorkspace {
                             }
                             if cargo[tgt].is_proc_macro {
                                 if let Some(proc_macro) = libproc_macro {
-                                    if crate_graph
-                                        .add_dep(
-                                            crate_id,
-                                            CrateName::new("proc_macro").unwrap(),
-                                            proc_macro,
-                                        )
-                                        .is_err()
-                                    {
+                                    if let Err(_) = crate_graph.add_dep(
+                                        crate_id,
+                                        CrateName::new("proc_macro").unwrap(),
+                                        proc_macro,
+                                    ) {
                                         log::error!(
                                             "cyclic dependency on proc_macro for {}",
                                             &cargo[pkg].name
@@ -447,50 +424,24 @@ impl ProjectWorkspace {
                     // Set deps to the core, std and to the lib target of the current package
                     for &from in pkg_crates.get(&pkg).into_iter().flatten() {
                         if let Some((to, name)) = lib_tgt.clone() {
-                            if to != from
-                                && crate_graph
-                                    .add_dep(
-                                        from,
-                                        // For root projects with dashes in their name,
-                                        // cargo metadata does not do any normalization,
-                                        // so we do it ourselves currently
-                                        CrateName::normalize_dashes(&name),
-                                        to,
-                                    )
-                                    .is_err()
-                            {
-                                {
-                                    log::error!(
-                                        "cyclic dependency between targets of {}",
-                                        &cargo[pkg].name
-                                    )
-                                }
-                            }
-                        }
-                        // core is added as a dependency before std in order to
-                        // mimic rustcs dependency order
-                        if let Some(core) = libcore {
-                            if crate_graph
-                                .add_dep(from, CrateName::new("core").unwrap(), core)
-                                .is_err()
-                            {
-                                log::error!("cyclic dependency on core for {}", &cargo[pkg].name)
-                            }
-                        }
-                        if let Some(alloc) = liballoc {
-                            if crate_graph
-                                .add_dep(from, CrateName::new("alloc").unwrap(), alloc)
-                                .is_err()
-                            {
-                                log::error!("cyclic dependency on alloc for {}", &cargo[pkg].name)
+                            // For root projects with dashes in their name,
+                            // 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 let Some(std) = libstd {
-                            if crate_graph
-                                .add_dep(from, CrateName::new("std").unwrap(), std)
-                                .is_err()
-                            {
-                                log::error!("cyclic dependency on std for {}", &cargo[pkg].name)
+                        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
+                                )
                             }
                         }
                     }
@@ -500,12 +451,10 @@ impl ProjectWorkspace {
                 // target of downstream.
                 for pkg in cargo.packages() {
                     for dep in cargo[pkg].dependencies.iter() {
+                        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 crate_graph
-                                    .add_dep(from, CrateName::new(&dep.name).unwrap(), to)
-                                    .is_err()
-                                {
+                                if let Err(_) = crate_graph.add_dep(from, name.clone(), to) {
                                     log::error!(
                                         "cyclic dependency {} -> {}",
                                         &cargo[pkg].name,
@@ -563,3 +512,51 @@ fn utf8_stdout(mut cmd: Command) -> Result<String> {
     let stdout = String::from_utf8(output.stdout)?;
     Ok(stdout.trim().to_string())
 }
+
+fn sysroot_to_crate_graph(
+    crate_graph: &mut CrateGraph,
+    sysroot: &Sysroot,
+    target: Option<&str>,
+    load: &mut dyn FnMut(&AbsPath) -> Option<FileId>,
+) -> (Vec<(CrateName, CrateId)>, Option<CrateId>) {
+    let mut cfg_options = CfgOptions::default();
+    cfg_options.extend(get_rustc_cfg_options(target));
+    let sysroot_crates: FxHashMap<_, _> = sysroot
+        .crates()
+        .filter_map(|krate| {
+            let file_id = load(&sysroot[krate].root)?;
+
+            let env = Env::default();
+            let proc_macro = vec![];
+            let name = sysroot[krate].name.clone();
+            let crate_id = crate_graph.add_crate_root(
+                file_id,
+                Edition::Edition2018,
+                Some(name),
+                cfg_options.clone(),
+                env,
+                proc_macro,
+            );
+            Some((krate, crate_id))
+        })
+        .collect();
+
+    for from in sysroot.crates() {
+        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")
+                }
+            }
+        }
+    }
+
+    let public_deps = sysroot
+        .public_deps()
+        .map(|(name, idx)| (CrateName::new(name).unwrap(), sysroot_crates[&idx]))
+        .collect::<Vec<_>>();
+
+    let libproc_macro = sysroot.proc_macro().and_then(|it| sysroot_crates.get(&it).copied());
+    (public_deps, libproc_macro)
+}
diff --git a/crates/project_model/src/project_json.rs b/crates/project_model/src/project_json.rs
index 060ea5b7d..5a0fe749a 100644
--- a/crates/project_model/src/project_json.rs
+++ b/crates/project_model/src/project_json.rs
@@ -7,12 +7,13 @@ use paths::{AbsPath, AbsPathBuf};
 use rustc_hash::FxHashMap;
 use serde::{de, Deserialize};
 
-use crate::cfg_flag::CfgFlag;
+use crate::{cfg_flag::CfgFlag, Sysroot};
 
 /// Roots and crates that compose this Rust project.
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub struct ProjectJson {
-    pub(crate) crates: Vec<Crate>,
+    pub(crate) sysroot: Option<Sysroot>,
+    crates: Vec<Crate>,
 }
 
 /// A crate points to the root module of a crate and lists the dependencies of the crate. This is
@@ -34,6 +35,7 @@ pub struct Crate {
 impl ProjectJson {
     pub fn new(base: &AbsPath, data: ProjectJsonData) -> ProjectJson {
         ProjectJson {
+            sysroot: data.sysroot_src.map(|it| base.join(it)).map(|it| Sysroot::load(&it)),
             crates: data
                 .crates
                 .into_iter()
@@ -43,11 +45,13 @@ impl ProjectJson {
                             && !crate_data.root_module.starts_with("..")
                             || crate_data.root_module.starts_with(base)
                     });
-                    let root_module = base.join(crate_data.root_module);
+                    let root_module = base.join(crate_data.root_module).normalize();
                     let (include, exclude) = match crate_data.source {
                         Some(src) => {
                             let absolutize = |dirs: Vec<PathBuf>| {
-                                dirs.into_iter().map(|it| base.join(it)).collect::<Vec<_>>()
+                                dirs.into_iter()
+                                    .map(|it| base.join(it).normalize())
+                                    .collect::<Vec<_>>()
                             };
                             (absolutize(src.include_dirs), absolutize(src.exclude_dirs))
                         }
@@ -79,10 +83,17 @@ impl ProjectJson {
                 .collect::<Vec<_>>(),
         }
     }
+    pub fn n_crates(&self) -> usize {
+        self.crates.len()
+    }
+    pub fn crates(&self) -> impl Iterator<Item = (CrateId, &Crate)> + '_ {
+        self.crates.iter().enumerate().map(|(idx, krate)| (CrateId(idx as u32), krate))
+    }
 }
 
 #[derive(Deserialize)]
 pub struct ProjectJsonData {
+    sysroot_src: Option<PathBuf>,
     crates: Vec<CrateData>,
 }
 
diff --git a/crates/project_model/src/sysroot.rs b/crates/project_model/src/sysroot.rs
index 687e15337..74c0eda9a 100644
--- a/crates/project_model/src/sysroot.rs
+++ b/crates/project_model/src/sysroot.rs
@@ -34,16 +34,10 @@ impl ops::Index<SysrootCrate> for Sysroot {
 }
 
 impl Sysroot {
-    pub fn core(&self) -> Option<SysrootCrate> {
-        self.by_name("core")
-    }
-
-    pub fn alloc(&self) -> Option<SysrootCrate> {
-        self.by_name("alloc")
-    }
-
-    pub fn std(&self) -> Option<SysrootCrate> {
-        self.by_name("std")
+    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)?)))
     }
 
     pub fn proc_macro(&self) -> Option<SysrootCrate> {
@@ -81,7 +75,7 @@ impl Sysroot {
             }
         }
 
-        if let Some(std) = sysroot.std() {
+        if let Some(std) = sysroot.by_name("std") {
             for dep in STD_DEPS.trim().lines() {
                 if let Some(dep) = sysroot.by_name(dep) {
                     sysroot.crates[std].deps.push(dep)
@@ -89,8 +83,8 @@ impl Sysroot {
             }
         }
 
-        if let Some(alloc) = sysroot.alloc() {
-            if let Some(core) = sysroot.core() {
+        if let Some(alloc) = sysroot.by_name("alloc") {
+            if let Some(core) = sysroot.by_name("core") {
                 sysroot.crates[alloc].deps.push(core);
             }
         }