Cleanup project.json deserialization

15 files changed, 138 insertions, 141 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 91a932549..7bd2144a7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1183,6 +1183,7 @@ dependencies = [
  "rustc-hash",
  "serde",
  "serde_json",
+ "stdx",
 ]
 
 [[package]]
diff --git a/crates/ra_project_model/Cargo.toml b/crates/ra_project_model/Cargo.toml
index 818947014..b1b44dcf7 100644
--- a/crates/ra_project_model/Cargo.toml
+++ b/crates/ra_project_model/Cargo.toml
@@ -19,6 +19,7 @@ ra_db = { path = "../ra_db" }
 ra_toolchain = { path = "../ra_toolchain" }
 ra_proc_macro =  { path = "../ra_proc_macro" }
 paths =  { path = "../paths" }
+stdx =  { path = "../stdx" }
 
 serde = { version = "1.0.106", features = ["derive"] }
 serde_json = "1.0.48"
diff --git a/crates/ra_project_model/src/cargo_workspace.rs b/crates/ra_project_model/src/cargo_workspace.rs
index 8ce63ab3c..3b124020d 100644
--- a/crates/ra_project_model/src/cargo_workspace.rs
+++ b/crates/ra_project_model/src/cargo_workspace.rs
@@ -260,7 +260,7 @@ impl CargoWorkspace {
             .copied()
     }
 
-    pub fn workspace_root(&self) -> &Path {
+    pub fn workspace_root(&self) -> &AbsPath {
         &self.workspace_root
     }
 
diff --git a/crates/ra_project_model/src/lib.rs b/crates/ra_project_model/src/lib.rs
index 7e8e00df8..8b85b4831 100644
--- a/crates/ra_project_model/src/lib.rs
+++ b/crates/ra_project_model/src/lib.rs
@@ -5,8 +5,8 @@ mod project_json;
 mod sysroot;
 
 use std::{
-    fs::{read_dir, File, ReadDir},
-    io::{self, BufReader},
+    fs::{self, read_dir, ReadDir},
+    io,
     path::Path,
     process::{Command, Output},
 };
@@ -14,13 +14,12 @@ use std::{
 use anyhow::{bail, Context, Result};
 use paths::{AbsPath, AbsPathBuf};
 use ra_cfg::CfgOptions;
-use ra_db::{CrateGraph, CrateName, Edition, Env, FileId};
+use ra_db::{CrateGraph, CrateId, CrateName, Edition, Env, FileId};
 use rustc_hash::{FxHashMap, FxHashSet};
-use serde_json::from_reader;
 
 pub use crate::{
     cargo_workspace::{CargoConfig, CargoWorkspace, Package, Target, TargetKind},
-    project_json::ProjectJson,
+    project_json::{ProjectJson, ProjectJsonData},
     sysroot::Sysroot,
 };
 pub use ra_proc_macro::ProcMacroClient;
@@ -30,7 +29,7 @@ pub enum ProjectWorkspace {
     /// Project workspace was discovered by running `cargo metadata` and `rustc --print sysroot`.
     Cargo { cargo: CargoWorkspace, sysroot: Sysroot },
     /// Project workspace was manually specified using a `rust-project.json` file.
-    Json { project: ProjectJson, project_location: AbsPathBuf },
+    Json { project: ProjectJson },
 }
 
 /// `PackageRoot` describes a package root folder.
@@ -156,17 +155,15 @@ impl ProjectWorkspace {
     ) -> Result<ProjectWorkspace> {
         let res = match manifest {
             ProjectManifest::ProjectJson(project_json) => {
-                let file = File::open(&project_json).with_context(|| {
-                    format!("Failed to open json file {}", project_json.display())
+                let file = fs::read_to_string(&project_json).with_context(|| {
+                    format!("Failed to read json file {}", project_json.display())
+                })?;
+                let data = serde_json::from_str(&file).with_context(|| {
+                    format!("Failed to deserialize json file {}", project_json.display())
                 })?;
-                let reader = BufReader::new(file);
                 let project_location = project_json.parent().unwrap().to_path_buf();
-                ProjectWorkspace::Json {
-                    project: from_reader(reader).with_context(|| {
-                        format!("Failed to deserialize json file {}", project_json.display())
-                    })?,
-                    project_location,
-                }
+                let project = ProjectJson::new(&project_location, data);
+                ProjectWorkspace::Json { project }
             }
             ProjectManifest::CargoToml(cargo_toml) => {
                 let cargo = CargoWorkspace::from_cargo_metadata(&cargo_toml, cargo_features)
@@ -198,11 +195,9 @@ impl ProjectWorkspace {
     /// the root is a member of the current workspace
     pub fn to_roots(&self) -> Vec<PackageRoot> {
         match self {
-            ProjectWorkspace::Json { project, project_location } => project
-                .roots
-                .iter()
-                .map(|r| PackageRoot::new_member(project_location.join(&r.path)))
-                .collect(),
+            ProjectWorkspace::Json { project } => {
+                project.roots.iter().map(|r| PackageRoot::new_member(r.path.clone())).collect()
+            }
             ProjectWorkspace::Cargo { cargo, sysroot } => cargo
                 .packages()
                 .map(|pkg| PackageRoot {
@@ -219,11 +214,11 @@ impl ProjectWorkspace {
 
     pub fn proc_macro_dylib_paths(&self) -> Vec<AbsPathBuf> {
         match self {
-            ProjectWorkspace::Json { project, project_location } => project
+            ProjectWorkspace::Json { project } => project
                 .crates
                 .iter()
                 .filter_map(|krate| krate.proc_macro_dylib_path.as_ref())
-                .map(|it| project_location.join(it))
+                .cloned()
                 .collect(),
             ProjectWorkspace::Cargo { cargo, sysroot: _sysroot } => cargo
                 .packages()
@@ -246,36 +241,18 @@ impl ProjectWorkspace {
         &self,
         target: Option<&str>,
         proc_macro_client: &ProcMacroClient,
-        load: &mut dyn FnMut(&Path) -> Option<FileId>,
+        load: &mut dyn FnMut(&AbsPath) -> Option<FileId>,
     ) -> CrateGraph {
         let mut crate_graph = CrateGraph::default();
         match self {
-            ProjectWorkspace::Json { project, project_location } => {
+            ProjectWorkspace::Json { project } => {
                 let crates: FxHashMap<_, _> = project
                     .crates
                     .iter()
                     .enumerate()
                     .filter_map(|(seq_index, krate)| {
-                        let file_path = project_location.join(&krate.root_module);
+                        let file_path = &krate.root_module;
                         let file_id = load(&file_path)?;
-                        let edition = match krate.edition {
-                            project_json::Edition::Edition2015 => Edition::Edition2015,
-                            project_json::Edition::Edition2018 => Edition::Edition2018,
-                        };
-                        let cfg_options = {
-                            let mut opts = CfgOptions::default();
-                            for cfg in &krate.cfg {
-                                match cfg.find('=') {
-                                    None => opts.insert_atom(cfg.into()),
-                                    Some(pos) => {
-                                        let key = &cfg[..pos];
-                                        let value = cfg[pos + 1..].trim_matches('"');
-                                        opts.insert_key_value(key.into(), value.into());
-                                    }
-                                }
-                            }
-                            opts
-                        };
 
                         let mut env = Env::default();
                         if let Some(out_dir) = &krate.out_dir {
@@ -290,13 +267,13 @@ impl ProjectWorkspace {
                             .map(|it| proc_macro_client.by_dylib_path(&it));
                         // FIXME: No crate name in json definition such that we cannot add OUT_DIR to env
                         Some((
-                            project_json::CrateId(seq_index),
+                            CrateId(seq_index as u32),
                             crate_graph.add_crate_root(
                                 file_id,
-                                edition,
+                                krate.edition,
                                 // FIXME json definitions can store the crate name
                                 None,
-                                cfg_options,
+                                krate.cfg.clone(),
                                 env,
                                 proc_macro.unwrap_or_default(),
                             ),
@@ -306,8 +283,8 @@ impl ProjectWorkspace {
 
                 for (id, krate) in project.crates.iter().enumerate() {
                     for dep in &krate.deps {
-                        let from_crate_id = project_json::CrateId(id);
-                        let to_crate_id = dep.krate;
+                        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))
                         {
@@ -523,7 +500,7 @@ impl ProjectWorkspace {
         crate_graph
     }
 
-    pub fn workspace_root_for(&self, path: &Path) -> Option<&Path> {
+    pub fn workspace_root_for(&self, path: &Path) -> Option<&AbsPath> {
         match self {
             ProjectWorkspace::Cargo { cargo, .. } => {
                 Some(cargo.workspace_root()).filter(|root| path.starts_with(root))
@@ -531,7 +508,7 @@ impl ProjectWorkspace {
             ProjectWorkspace::Json { project: ProjectJson { roots, .. }, .. } => roots
                 .iter()
                 .find(|root| path.starts_with(&root.path))
-                .map(|root| root.path.as_ref()),
+                .map(|root| root.path.as_path()),
         }
     }
 }
diff --git a/crates/ra_project_model/src/project_json.rs b/crates/ra_project_model/src/project_json.rs
index e663bb4d7..4b5dcd634 100644
--- a/crates/ra_project_model/src/project_json.rs
+++ b/crates/ra_project_model/src/project_json.rs
@@ -2,11 +2,15 @@
 
 use std::path::PathBuf;
 
+use paths::{AbsPath, AbsPathBuf};
+use ra_cfg::CfgOptions;
+use ra_db::{CrateId, Dependency, Edition};
 use rustc_hash::FxHashSet;
 use serde::Deserialize;
+use stdx::split_delim;
 
 /// Roots and crates that compose this Rust project.
-#[derive(Clone, Debug, Deserialize)]
+#[derive(Clone, Debug)]
 pub struct ProjectJson {
     pub(crate) roots: Vec<Root>,
     pub(crate) crates: Vec<Crate>,
@@ -14,82 +18,100 @@ pub struct ProjectJson {
 
 /// A root points to the directory which contains Rust crates. rust-analyzer watches all files in
 /// all roots. Roots might be nested.
-#[derive(Clone, Debug, Deserialize)]
-#[serde(transparent)]
+#[derive(Clone, Debug)]
 pub struct Root {
-    pub(crate) path: PathBuf,
+    pub(crate) path: AbsPathBuf,
 }
 
 /// A crate points to the root module of a crate and lists the dependencies of the crate. This is
 /// useful in creating the crate graph.
-#[derive(Clone, Debug, Deserialize)]
+#[derive(Clone, Debug)]
 pub struct Crate {
-    pub(crate) root_module: PathBuf,
+    pub(crate) root_module: AbsPathBuf,
     pub(crate) edition: Edition,
-    pub(crate) deps: Vec<Dep>,
+    pub(crate) deps: Vec<Dependency>,
+    pub(crate) cfg: CfgOptions,
+    pub(crate) out_dir: Option<AbsPathBuf>,
+    pub(crate) proc_macro_dylib_path: Option<AbsPathBuf>,
+}
 
-    #[serde(default)]
-    pub(crate) cfg: FxHashSet<String>,
+impl ProjectJson {
+    pub fn new(base: &AbsPath, data: ProjectJsonData) -> ProjectJson {
+        ProjectJson {
+            roots: data.roots.into_iter().map(|path| Root { path: base.join(path) }).collect(),
+            crates: data
+                .crates
+                .into_iter()
+                .map(|crate_data| Crate {
+                    root_module: base.join(crate_data.root_module),
+                    edition: crate_data.edition.into(),
+                    deps: crate_data
+                        .deps
+                        .into_iter()
+                        .map(|dep_data| Dependency {
+                            crate_id: CrateId(dep_data.krate as u32),
+                            name: dep_data.name.into(),
+                        })
+                        .collect::<Vec<_>>(),
+                    cfg: {
+                        let mut cfg = CfgOptions::default();
+                        for entry in &crate_data.cfg {
+                            match split_delim(entry, '=') {
+                                Some((key, value)) => {
+                                    cfg.insert_key_value(key.into(), value.into());
+                                }
+                                None => cfg.insert_atom(entry.into()),
+                            }
+                        }
+                        cfg
+                    },
+                    out_dir: crate_data.out_dir.map(|it| base.join(it)),
+                    proc_macro_dylib_path: crate_data.proc_macro_dylib_path.map(|it| base.join(it)),
+                })
+                .collect::<Vec<_>>(),
+        }
+    }
+}
 
-    pub(crate) out_dir: Option<PathBuf>,
-    pub(crate) proc_macro_dylib_path: Option<PathBuf>,
+#[derive(Deserialize)]
+pub struct ProjectJsonData {
+    roots: Vec<PathBuf>,
+    crates: Vec<CrateData>,
 }
 
-#[derive(Clone, Copy, Debug, Deserialize)]
+#[derive(Deserialize)]
+struct CrateData {
+    root_module: PathBuf,
+    edition: EditionData,
+    deps: Vec<DepData>,
+    #[serde(default)]
+    cfg: FxHashSet<String>,
+    out_dir: Option<PathBuf>,
+    proc_macro_dylib_path: Option<PathBuf>,
+}
+
+#[derive(Deserialize)]
 #[serde(rename = "edition")]
-pub enum Edition {
+enum EditionData {
     #[serde(rename = "2015")]
     Edition2015,
     #[serde(rename = "2018")]
     Edition2018,
 }
 
-/// Identifies a crate by position in the crates array.
-#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, Ord, PartialEq, PartialOrd)]
-#[serde(transparent)]
-pub struct CrateId(pub usize);
-
-/// A dependency of a crate, identified by its id in the crates array and name.
-#[derive(Clone, Debug, Deserialize)]
-pub struct Dep {
-    #[serde(rename = "crate")]
-    pub(crate) krate: CrateId,
-    pub(crate) name: String,
+impl From<EditionData> for Edition {
+    fn from(data: EditionData) -> Self {
+        match data {
+            EditionData::Edition2015 => Edition::Edition2015,
+            EditionData::Edition2018 => Edition::Edition2018,
+        }
+    }
 }
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use serde_json::json;
-
-    #[test]
-    fn test_crate_deserialization() {
-        let raw_json = json!(    {
-            "crate_id": 2,
-            "root_module": "this/is/a/file/path.rs",
-            "deps": [
-              {
-                "crate": 1,
-                "name": "some_dep_crate"
-              },
-            ],
-            "edition": "2015",
-            "cfg": [
-              "atom_1",
-              "atom_2",
-              "feature=feature_1",
-              "feature=feature_2",
-              "other=value",
-            ],
-
-        });
-
-        let krate: Crate = serde_json::from_value(raw_json).unwrap();
-
-        assert!(krate.cfg.contains(&"atom_1".to_string()));
-        assert!(krate.cfg.contains(&"atom_2".to_string()));
-        assert!(krate.cfg.contains(&"feature=feature_1".to_string()));
-        assert!(krate.cfg.contains(&"feature=feature_2".to_string()));
-        assert!(krate.cfg.contains(&"other=value".to_string()));
-    }
+#[derive(Deserialize)]
+struct DepData {
+    /// Identifies a crate by position in the crates array.
+    #[serde(rename = "crate")]
+    krate: usize,
+    name: String,
 }
diff --git a/crates/rust-analyzer/src/cargo_target_spec.rs b/crates/rust-analyzer/src/cargo_target_spec.rs
index 65f90c83c..e98d0f868 100644
--- a/crates/rust-analyzer/src/cargo_target_spec.rs
+++ b/crates/rust-analyzer/src/cargo_target_spec.rs
@@ -1,8 +1,7 @@
 //! See `CargoTargetSpec`
 
-use std::path::PathBuf;
-
 use ra_cfg::CfgExpr;
+use ra_db::AbsPathBuf;
 use ra_ide::{FileId, RunnableKind, TestId};
 use ra_project_model::{self, TargetKind};
 
@@ -14,7 +13,7 @@ use crate::{global_state::GlobalStateSnapshot, Result};
 /// build/test/run the target.
 #[derive(Clone)]
 pub(crate) struct CargoTargetSpec {
-    pub(crate) workspace_root: PathBuf,
+    pub(crate) workspace_root: AbsPathBuf,
     pub(crate) package: String,
     pub(crate) target: String,
     pub(crate) target_kind: TargetKind,
diff --git a/crates/rust-analyzer/src/cli/load_cargo.rs b/crates/rust-analyzer/src/cli/load_cargo.rs
index e910db6eb..9c510bb62 100644
--- a/crates/rust-analyzer/src/cli/load_cargo.rs
+++ b/crates/rust-analyzer/src/cli/load_cargo.rs
@@ -1,13 +1,13 @@
 //! Loads a Cargo project into a static instance of analysis, without support
 //! for incorporating changes.
-use std::{convert::TryFrom, path::Path, sync::Arc};
+use std::{path::Path, sync::Arc};
 
 use anyhow::Result;
 use crossbeam_channel::{unbounded, Receiver};
 use ra_db::{AbsPathBuf, CrateGraph};
 use ra_ide::{AnalysisChange, AnalysisHost};
 use ra_project_model::{CargoConfig, ProcMacroClient, ProjectManifest, ProjectWorkspace};
-use vfs::loader::Handle;
+use vfs::{loader::Handle, AbsPath};
 
 use crate::global_state::{ProjectFolders, SourceRootConfig};
 
@@ -39,10 +39,9 @@ pub fn load_cargo(
         ProcMacroClient::dummy()
     };
 
-    let crate_graph = ws.to_crate_graph(None, &proc_macro_client, &mut |path: &Path| {
-        let path = AbsPathBuf::try_from(path.to_path_buf()).unwrap();
-        let contents = loader.load_sync(&path);
-        let path = vfs::VfsPath::from(path);
+    let crate_graph = ws.to_crate_graph(None, &proc_macro_client, &mut |path: &AbsPath| {
+        let contents = loader.load_sync(path);
+        let path = vfs::VfsPath::from(path.to_path_buf());
         vfs.set_file_contents(path.clone(), contents);
         vfs.file_id(&path)
     });
diff --git a/crates/rust-analyzer/src/config.rs b/crates/rust-analyzer/src/config.rs
index 7eded04c5..8f69de968 100644
--- a/crates/rust-analyzer/src/config.rs
+++ b/crates/rust-analyzer/src/config.rs
@@ -14,7 +14,7 @@ use lsp_types::ClientCapabilities;
 use ra_db::AbsPathBuf;
 use ra_flycheck::FlycheckConfig;
 use ra_ide::{AssistConfig, CompletionConfig, HoverConfig, InlayHintsConfig};
-use ra_project_model::{CargoConfig, ProjectJson, ProjectManifest};
+use ra_project_model::{CargoConfig, ProjectJson, ProjectJsonData, ProjectManifest};
 use serde::Deserialize;
 
 #[derive(Debug, Clone)]
@@ -273,19 +273,19 @@ impl Config {
             self.lens = LensConfig::NO_LENS;
         }
 
-        if let Some(linked_projects) = get::<Vec<ManifestOrJsonProject>>(value, "/linkedProjects") {
+        if let Some(linked_projects) = get::<Vec<ManifestOrProjectJson>>(value, "/linkedProjects") {
             if !linked_projects.is_empty() {
                 self.linked_projects.clear();
                 for linked_project in linked_projects {
                     let linked_project = match linked_project {
-                        ManifestOrJsonProject::Manifest(it) => {
+                        ManifestOrProjectJson::Manifest(it) => {
                             let path = self.root_path.join(it);
                             match ProjectManifest::from_manifest_file(path) {
                                 Ok(it) => it.into(),
                                 Err(_) => continue,
                             }
                         }
-                        ManifestOrJsonProject::JsonProject(it) => it.into(),
+                        ManifestOrProjectJson::ProjectJson(it) => ProjectJson::new(&self.root_path, it).into(),
                     };
                     self.linked_projects.push(linked_project);
                 }
@@ -371,7 +371,7 @@ impl Config {
 
 #[derive(Deserialize)]
 #[serde(untagged)]
-enum ManifestOrJsonProject {
+enum ManifestOrProjectJson {
     Manifest(PathBuf),
-    JsonProject(ProjectJson),
+    ProjectJson(ProjectJsonData),
 }
diff --git a/crates/rust-analyzer/src/global_state.rs b/crates/rust-analyzer/src/global_state.rs
index f18694feb..e7eeb60ee 100644
--- a/crates/rust-analyzer/src/global_state.rs
+++ b/crates/rust-analyzer/src/global_state.rs
@@ -3,7 +3,7 @@
 //!
 //! Each tick provides an immutable snapshot of the state as `WorldSnapshot`.
 
-use std::{convert::TryFrom, path::Path, sync::Arc};
+use std::{convert::TryFrom, sync::Arc};
 
 use crossbeam_channel::{unbounded, Receiver};
 use lsp_types::Url;
@@ -13,7 +13,7 @@ use ra_flycheck::{Flycheck, FlycheckConfig};
 use ra_ide::{Analysis, AnalysisChange, AnalysisHost, CrateGraph, FileId};
 use ra_project_model::{CargoWorkspace, ProcMacroClient, ProjectWorkspace, Target};
 use stdx::format_to;
-use vfs::{file_set::FileSetConfig, loader::Handle, AbsPathBuf};
+use vfs::{file_set::FileSetConfig, loader::Handle, AbsPath, AbsPathBuf};
 
 use crate::{
     config::{Config, FilesWatcher},
@@ -31,7 +31,7 @@ fn create_flycheck(workspaces: &[ProjectWorkspace], config: &FlycheckConfig) ->
     workspaces.iter().find_map(|w| match w {
         ProjectWorkspace::Cargo { cargo, .. } => {
             let cargo_project_root = cargo.workspace_root().to_path_buf();
-            Some(Flycheck::new(config.clone(), cargo_project_root))
+            Some(Flycheck::new(config.clone(), cargo_project_root.into()))
         }
         ProjectWorkspace::Json { .. } => {
             log::warn!("Cargo check watching only supported for cargo workspaces, disabling");
@@ -112,10 +112,9 @@ impl GlobalState {
 
         // Create crate graph from all the workspaces
         let mut crate_graph = CrateGraph::default();
-        let mut load = |path: &Path| {
-            let path = AbsPathBuf::try_from(path.to_path_buf()).ok()?;
-            let contents = loader.load_sync(&path);
-            let path = vfs::VfsPath::from(path);
+        let mut load = |path: &AbsPath| {
+            let contents = loader.load_sync(path);
+            let path = vfs::VfsPath::from(path.to_path_buf());
             vfs.set_file_contents(path.clone(), contents);
             vfs.file_id(&path)
         };
diff --git a/crates/rust-analyzer/src/main_loop.rs b/crates/rust-analyzer/src/main_loop.rs
index b9d296856..390c66dfc 100644
--- a/crates/rust-analyzer/src/main_loop.rs
+++ b/crates/rust-analyzer/src/main_loop.rs
@@ -114,10 +114,7 @@ pub fn main_loop(config: Config, connection: Connection) -> Result<()> {
                         .ok()
                     }
                     LinkedProject::InlineJsonProject(it) => {
-                        Some(ra_project_model::ProjectWorkspace::Json {
-                            project: it.clone(),
-                            project_location: config.root_path.clone(),
-                        })
+                        Some(ra_project_model::ProjectWorkspace::Json { project: it.clone() })
                     }
                 })
                 .collect::<Vec<_>>()
diff --git a/crates/rust-analyzer/src/main_loop/handlers.rs b/crates/rust-analyzer/src/main_loop/handlers.rs
index 221b902b2..a1e2432cf 100644
--- a/crates/rust-analyzer/src/main_loop/handlers.rs
+++ b/crates/rust-analyzer/src/main_loop/handlers.rs
@@ -419,7 +419,7 @@ pub fn handle_runnables(
                     location: None,
                     kind: lsp_ext::RunnableKind::Cargo,
                     args: lsp_ext::CargoRunnable {
-                        workspace_root: Some(spec.workspace_root.clone()),
+                        workspace_root: Some(spec.workspace_root.clone().into()),
                         cargo_args: vec![
                             cmd.to_string(),
                             "--package".to_string(),
diff --git a/crates/rust-analyzer/src/to_proto.rs b/crates/rust-analyzer/src/to_proto.rs
index da9887a9a..88d1c0d8a 100644
--- a/crates/rust-analyzer/src/to_proto.rs
+++ b/crates/rust-analyzer/src/to_proto.rs
@@ -663,7 +663,7 @@ pub(crate) fn runnable(
         location: Some(location),
         kind: lsp_ext::RunnableKind::Cargo,
         args: lsp_ext::CargoRunnable {
-            workspace_root: workspace_root,
+            workspace_root: workspace_root.map(|it| it.into()),
             cargo_args,
             executable_args,
         },
diff --git a/crates/vfs-notify/src/lib.rs b/crates/vfs-notify/src/lib.rs
index baee6ddc8..5b4978285 100644
--- a/crates/vfs-notify/src/lib.rs
+++ b/crates/vfs-notify/src/lib.rs
@@ -45,7 +45,7 @@ impl loader::Handle for LoaderHandle {
     fn invalidate(&mut self, path: AbsPathBuf) {
         self.sender.send(Message::Invalidate(path)).unwrap();
     }
-    fn load_sync(&mut self, path: &AbsPathBuf) -> Option<Vec<u8>> {
+    fn load_sync(&mut self, path: &AbsPath) -> Option<Vec<u8>> {
         read(path)
     }
 }
diff --git a/crates/vfs/src/loader.rs b/crates/vfs/src/loader.rs
index a216b5f13..052803dd9 100644
--- a/crates/vfs/src/loader.rs
+++ b/crates/vfs/src/loader.rs
@@ -1,7 +1,7 @@
 //! Object safe interface for file watching and reading.
 use std::fmt;
 
-use paths::AbsPathBuf;
+use paths::{AbsPath, AbsPathBuf};
 
 #[derive(Debug)]
 pub enum Entry {
@@ -28,7 +28,7 @@ pub trait Handle: fmt::Debug {
         Self: Sized;
     fn set_config(&mut self, config: Config);
     fn invalidate(&mut self, path: AbsPathBuf);
-    fn load_sync(&mut self, path: &AbsPathBuf) -> Option<Vec<u8>>;
+    fn load_sync(&mut self, path: &AbsPath) -> Option<Vec<u8>>;
 }
 
 impl Entry {
diff --git a/docs/user/manual.adoc b/docs/user/manual.adoc
index f1b7ed7fc..0dc1dc2ae 100644
--- a/docs/user/manual.adoc
+++ b/docs/user/manual.adoc
@@ -322,6 +322,8 @@ There are tree ways to feed `rust-project.json` to rust-analyzer:
 * Specify `"rust-analyzer.linkedProjects": [ "path/to/rust-project.json" ]` in the settings (and make sure that your LSP client sends settings as a part of initialize request).
 * Specify `"rust-analyzer.linkedProjects": [ { "roots": [...], "crates": [...] }]` inline.
 
+Relative paths are interpreted relative to `rust-project.json` file location or (for inline JSON) relative to `rootUri`.
+
 See https://github.com/rust-analyzer/rust-project.json-example for a small example.
 
 == Features