Read default cfgs from rustc

Cargo.lock

@@ -1032,6 +1032,7 @@ dependencies = [
  "lsp-server 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lsp-types 0.61.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ra_cfg 0.1.0",
  "ra_db 0.1.0",
  "ra_ide_api 0.1.0",
  "ra_prof 0.1.0",

crates/ra_batch/src/lib.rs

@@ -7,7 +7,7 @@ use rustc_hash::FxHashMap;
 use crossbeam_channel::{unbounded, Receiver};
 use ra_db::{CrateGraph, FileId, SourceRootId};
 use ra_ide_api::{AnalysisChange, AnalysisHost, FeatureFlags};
-use ra_project_model::{PackageRoot, ProjectWorkspace};
+use ra_project_model::{get_rustc_cfg_options, PackageRoot, ProjectWorkspace};
 use ra_vfs::{RootEntry, Vfs, VfsChange, VfsTask, Watch};
 use ra_vfs_glob::RustPackageFilterBuilder;
 
@@ -41,11 +41,17 @@ pub fn load_cargo(root: &Path) -> Result<(AnalysisHost, FxHashMap<SourceRootId,
         sender,
         Watch(false),
     );
-    let (crate_graph, _crate_names) = ws.to_crate_graph(&mut |path: &Path| {
-        let vfs_file = vfs.load(path);
-        log::debug!("vfs file {:?} -> {:?}", path, vfs_file);
-        vfs_file.map(vfs_file_to_id)
-    });
+
+    // FIXME: cfg options?
+    let default_cfg_options =
+        get_rustc_cfg_options().atom("test".into()).atom("debug_assertion".into());
+
+    let (crate_graph, _crate_names) =
+        ws.to_crate_graph(&default_cfg_options, &mut |path: &Path| {
+            let vfs_file = vfs.load(path);
+            log::debug!("vfs file {:?} -> {:?}", path, vfs_file);
+            vfs_file.map(vfs_file_to_id)
+        });
     log::debug!("crate graph: {:?}", crate_graph);
 
     let source_roots = roots

crates/ra_cfg/src/lib.rs

@@ -1,4 +1,6 @@
 //! ra_cfg defines conditional compiling options, `cfg` attibute parser and evaluator
+use std::iter::IntoIterator;
+
 use ra_syntax::SmolStr;
 use rustc_hash::FxHashSet;
 
@@ -44,6 +46,14 @@ impl CfgOptions {
         self
     }
 
+    /// Shortcut to set features
+    pub fn features(mut self, iter: impl IntoIterator<Item = SmolStr>) -> CfgOptions {
+        for feat in iter {
+            self = self.key_value("feature".into(), feat);
+        }
+        self
+    }
+
     pub fn remove_atom(mut self, name: &SmolStr) -> CfgOptions {
         self.atoms.remove(name);
         self

crates/ra_lsp_server/Cargo.toml

@@ -19,6 +19,7 @@ jod-thread = "0.1.0"
 ra_vfs = "0.4.0"
 ra_syntax = { path = "../ra_syntax" }
 ra_db = { path = "../ra_db" }
+ra_cfg = { path = "../ra_cfg" }
 ra_text_edit = { path = "../ra_text_edit" }
 ra_ide_api = { path = "../ra_ide_api" }
 lsp-server = "0.2.0"

crates/ra_lsp_server/src/world.rs

@@ -13,7 +13,7 @@ use ra_ide_api::{
     Analysis, AnalysisChange, AnalysisHost, CrateGraph, FeatureFlags, FileId, LibraryData,
     SourceRootId,
 };
-use ra_project_model::ProjectWorkspace;
+use ra_project_model::{get_rustc_cfg_options, ProjectWorkspace};
 use ra_vfs::{LineEndings, RootEntry, Vfs, VfsChange, VfsFile, VfsRoot, VfsTask, Watch};
 use ra_vfs_glob::{Glob, RustPackageFilterBuilder};
 use relative_path::RelativePathBuf;
@@ -97,6 +97,10 @@ impl WorldState {
             change.set_debug_root_path(SourceRootId(r.0), vfs_root_path.display().to_string());
         }
 
+        // FIXME: Read default cfgs from config
+        let default_cfg_options =
+            get_rustc_cfg_options().atom("test".into()).atom("debug_assertion".into());
+
         // Create crate graph from all the workspaces
         let mut crate_graph = CrateGraph::default();
         let mut load = |path: &std::path::Path| {
@@ -104,7 +108,7 @@ impl WorldState {
             vfs_file.map(|f| FileId(f.0))
         };
         for ws in workspaces.iter() {
-            let (graph, crate_names) = ws.to_crate_graph(&mut load);
+            let (graph, crate_names) = ws.to_crate_graph(&default_cfg_options, &mut load);
             let shift = crate_graph.extend(graph);
             for (crate_id, name) in crate_names {
                 change.set_debug_crate_name(crate_id.shift(shift), name)

crates/ra_project_model/src/cargo_workspace.rs

@@ -39,6 +39,7 @@ struct PackageData {
     is_member: bool,
     dependencies: Vec<PackageDependency>,
     edition: Edition,
+    features: Vec<String>,
 }
 
 #[derive(Debug, Clone)]
@@ -91,6 +92,9 @@ impl Package {
     pub fn edition(self, ws: &CargoWorkspace) -> Edition {
         ws.packages[self].edition
     }
+    pub fn features(self, ws: &CargoWorkspace) -> &[String] {
+        &ws.packages[self].features
+    }
     pub fn targets<'a>(self, ws: &'a CargoWorkspace) -> impl Iterator<Item = Target> + 'a {
         ws.packages[self].targets.iter().cloned()
     }
@@ -144,6 +148,7 @@ impl CargoWorkspace {
                 is_member,
                 edition: Edition::from_string(&meta_pkg.edition),
                 dependencies: Vec::new(),
+                features: Vec::new(),
             });
             let pkg_data = &mut packages[pkg];
             pkg_by_id.insert(meta_pkg.id.clone(), pkg);
@@ -164,6 +169,7 @@ impl CargoWorkspace {
                 let dep = PackageDependency { name: dep_node.name, pkg: pkg_by_id[&dep_node.pkg] };
                 packages[source].dependencies.push(dep);
             }
+            packages[source].features.extend(node.features);
         }
 
         Ok(CargoWorkspace { packages, targets, workspace_root: meta.workspace_root })

crates/ra_project_model/src/json_project.rs

@@ -19,6 +19,8 @@ pub struct Crate {
     pub(crate) root_module: PathBuf,
     pub(crate) edition: Edition,
     pub(crate) deps: Vec<Dep>,
+    #[serde(default)]
+    pub(crate) features: Vec<String>,
 }
 
 #[derive(Clone, Copy, Debug, Deserialize)]

crates/ra_project_model/src/lib.rs

@@ -9,6 +9,7 @@ use std::{
     fs::File,
     io::BufReader,
     path::{Path, PathBuf},
+    process::Command,
 };
 
 use ra_cfg::CfgOptions;
@@ -118,6 +119,7 @@ impl ProjectWorkspace {
 
     pub fn to_crate_graph(
         &self,
+        default_cfg_options: &CfgOptions,
         load: &mut dyn FnMut(&Path) -> Option<FileId>,
     ) -> (CrateGraph, FxHashMap<CrateId, String>) {
         let mut crate_graph = CrateGraph::default();
@@ -134,7 +136,9 @@ impl ProjectWorkspace {
                         };
                         // FIXME: cfg options
                         // Default to enable test for workspace crates.
-                        let cfg_options = CfgOptions::default().atom("test".into());
+                        let cfg_options = default_cfg_options
+                            .clone()
+                            .features(krate.features.iter().map(Into::into));
                         crates.insert(
                             crate_id,
                             crate_graph.add_crate_root(file_id, edition, cfg_options),
@@ -164,9 +168,8 @@ impl ProjectWorkspace {
                 let mut sysroot_crates = FxHashMap::default();
                 for krate in sysroot.crates() {
                     if let Some(file_id) = load(krate.root(&sysroot)) {
-                        // FIXME: cfg options
                         // Crates from sysroot have `cfg(test)` disabled
-                        let cfg_options = CfgOptions::default();
+                        let cfg_options = default_cfg_options.clone().remove_atom(&"test".into());
                         let crate_id =
                             crate_graph.add_crate_root(file_id, Edition::Edition2018, cfg_options);
                         sysroot_crates.insert(krate, crate_id);
@@ -197,9 +200,9 @@ impl ProjectWorkspace {
                         let root = tgt.root(&cargo);
                         if let Some(file_id) = load(root) {
                             let edition = pkg.edition(&cargo);
-                            // FIXME: cfg options
-                            // Default to enable test for workspace crates.
-                            let cfg_options = CfgOptions::default().atom("test".into());
+                            let cfg_options = default_cfg_options
+                                .clone()
+                                .features(pkg.features(&cargo).iter().map(Into::into));
                             let crate_id =
                                 crate_graph.add_crate_root(file_id, edition, cfg_options);
                             names.insert(crate_id, pkg.name(&cargo).to_string());
@@ -301,3 +304,32 @@ fn find_cargo_toml(path: &Path) -> Result<PathBuf> {
     }
     Err(format!("can't find Cargo.toml at {}", path.display()))?
 }
+
+pub fn get_rustc_cfg_options() -> CfgOptions {
+    let mut cfg_options = CfgOptions::default();
+
+    match (|| -> Result<_> {
+        // `cfg(test)` ans `cfg(debug_assertion)` is handled outside, so we suppress them here.
+        let output = Command::new("rustc").args(&["--print", "cfg", "-O"]).output()?;
+        if !output.status.success() {
+            Err("failed to get rustc cfgs")?;
+        }
+        Ok(String::from_utf8(output.stdout)?)
+    })() {
+        Ok(rustc_cfgs) => {
+            for line in rustc_cfgs.lines() {
+                match line.find('=') {
+                    None => cfg_options = cfg_options.atom(line.into()),
+                    Some(pos) => {
+                        let key = &line[..pos];
+                        let value = line[pos + 1..].trim_matches('"');
+                        cfg_options = cfg_options.key_value(key.into(), value.into());
+                    }
+                }
+            }
+        }
+        Err(e) => log::error!("failed to get rustc cfgs: {}", e),
+    }
+
+    cfg_options
+}