1 files changed, 590 insertions, 0 deletions

diff --git a/crates/project_model/src/workspace.rs b/crates/project_model/src/workspace.rs
new file mode 100644
index 000000000..9ebb0a811
--- /dev/null
+++ b/crates/project_model/src/workspace.rs
@@ -0,0 +1,590 @@
+//! Handles lowering of build-system specific workspace information (`cargo
+//! metadata` or `rust-project.json`) into representation stored in the salsa
+//! database -- `CrateGraph`.
+
+use std::{fmt, fs, path::Component, process::Command};
+
+use anyhow::{Context, Result};
+use base_db::{CrateDisplayName, CrateGraph, CrateId, CrateName, Edition, Env, FileId};
+use cfg::CfgOptions;
+use paths::{AbsPath, AbsPathBuf};
+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,
+};
+
+/// `PackageRoot` describes a package root folder.
+/// Which may be an external dependency, or a member of
+/// the current workspace.
+#[derive(Debug, Clone, Eq, PartialEq, Hash)]
+pub struct PackageRoot {
+    /// Is a member of the current workspace
+    pub is_member: bool,
+    pub include: Vec<AbsPathBuf>,
+    pub exclude: Vec<AbsPathBuf>,
+}
+
+#[derive(Clone, Eq, PartialEq)]
+pub enum ProjectWorkspace {
+    /// Project workspace was discovered by running `cargo metadata` and `rustc --print sysroot`.
+    Cargo { cargo: CargoWorkspace, sysroot: Sysroot, rustc: Option<CargoWorkspace> },
+    /// Project workspace was manually specified using a `rust-project.json` file.
+    Json { project: ProjectJson, sysroot: Option<Sysroot> },
+}
+
+impl fmt::Debug for ProjectWorkspace {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            ProjectWorkspace::Cargo { cargo, sysroot, rustc } => f
+                .debug_struct("Cargo")
+                .field("n_packages", &cargo.packages().len())
+                .field("n_sysroot_crates", &sysroot.crates().len())
+                .field(
+                    "n_rustc_compiler_crates",
+                    &rustc.as_ref().map_or(0, |rc| rc.packages().len()),
+                )
+                .finish(),
+            ProjectWorkspace::Json { project, sysroot } => {
+                let mut debug_struct = f.debug_struct("Json");
+                debug_struct.field("n_crates", &project.n_crates());
+                if let Some(sysroot) = sysroot {
+                    debug_struct.field("n_sysroot_crates", &sysroot.crates().len());
+                }
+                debug_struct.finish()
+            }
+        }
+    }
+}
+
+impl ProjectWorkspace {
+    pub fn load(manifest: ProjectManifest, config: &CargoConfig) -> Result<ProjectWorkspace> {
+        let res = match manifest {
+            ProjectManifest::ProjectJson(project_json) => {
+                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 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 }
+            }
+            ProjectManifest::CargoToml(cargo_toml) => {
+                let cargo_version = utf8_stdout({
+                    let mut cmd = Command::new(toolchain::cargo());
+                    cmd.arg("--version");
+                    cmd
+                })?;
+
+                let cargo = CargoWorkspace::from_cargo_metadata(&cargo_toml, config).with_context(
+                    || {
+                        format!(
+                            "Failed to read Cargo metadata from Cargo.toml file {}, {}",
+                            cargo_toml.display(),
+                            cargo_version
+                        )
+                    },
+                )?;
+                let sysroot = if config.no_sysroot {
+                    Sysroot::default()
+                } else {
+                    Sysroot::discover(&cargo_toml).with_context(|| {
+                        format!(
+                            "Failed to find sysroot for Cargo.toml file {}. Is rust-src installed?",
+                            cargo_toml.display()
+                        )
+                    })?
+                };
+
+                let rustc = if let Some(rustc_dir) = &config.rustc_source {
+                    Some(CargoWorkspace::from_cargo_metadata(&rustc_dir, config).with_context(
+                        || format!("Failed to read Cargo metadata for Rust sources"),
+                    )?)
+                } else {
+                    None
+                };
+
+                ProjectWorkspace::Cargo { cargo, sysroot, rustc }
+            }
+        };
+
+        Ok(res)
+    }
+
+    pub fn load_inline(project_json: ProjectJson) -> Result<ProjectWorkspace> {
+        let sysroot = match &project_json.sysroot_src {
+            Some(path) => Some(Sysroot::load(path)?),
+            None => None,
+        };
+
+        Ok(ProjectWorkspace::Json { project: project_json, sysroot })
+    }
+
+    /// Returns the roots for the current `ProjectWorkspace`
+    /// The return type contains the path and whether or not
+    /// the root is a member of the current workspace
+    pub fn to_roots(&self) -> Vec<PackageRoot> {
+        match self {
+            ProjectWorkspace::Json { project, sysroot } => project
+                .crates()
+                .map(|(_, krate)| PackageRoot {
+                    is_member: krate.is_workspace_member,
+                    include: krate.include.clone(),
+                    exclude: krate.exclude.clone(),
+                })
+                .collect::<FxHashSet<_>>()
+                .into_iter()
+                .chain(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, 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 {
+                        is_member: false,
+                        include: vec![sysroot[krate].root_dir().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()
+                }
+            }
+        }
+    }
+
+    pub fn n_packages(&self) -> usize {
+        match self {
+            ProjectWorkspace::Json { project, .. } => project.n_crates(),
+            ProjectWorkspace::Cargo { cargo, sysroot, rustc } => {
+                let rustc_package_len = rustc.as_ref().map_or(0, |rc| rc.packages().len());
+                cargo.packages().len() + sysroot.crates().len() + rustc_package_len
+            }
+        }
+    }
+
+    pub fn to_crate_graph(
+        &self,
+        target: Option<&str>,
+        proc_macro_client: &ProcMacroClient,
+        load: &mut dyn FnMut(&AbsPath) -> Option<FileId>,
+    ) -> CrateGraph {
+        let mut crate_graph = CrateGraph::default();
+        match self {
+            ProjectWorkspace::Json { project, sysroot } => {
+                let sysroot_dps = 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()
+                    .filter_map(|(crate_id, krate)| {
+                        let file_path = &krate.root_module;
+                        let file_id = match load(&file_path) {
+                            Some(id) => id,
+                            None => {
+                                log::error!("failed to load crate root {}", file_path.display());
+                                return None;
+                            }
+                        };
+
+                        let env = krate.env.clone().into_iter().collect();
+                        let proc_macro = krate
+                            .proc_macro_dylib_path
+                            .clone()
+                            .map(|it| proc_macro_client.by_dylib_path(&it));
+
+                        let target = krate.target.as_deref().or(target);
+                        let target_cfgs = cfg_cache
+                            .entry(target)
+                            .or_insert_with(|| get_rustc_cfg_options(target));
+
+                        let mut cfg_options = CfgOptions::default();
+                        cfg_options.extend(target_cfgs.iter().chain(krate.cfg.iter()).cloned());
+
+                        Some((
+                            crate_id,
+                            crate_graph.add_crate_root(
+                                file_id,
+                                krate.edition,
+                                krate.display_name.clone(),
+                                cfg_options,
+                                env,
+                                proc_macro.unwrap_or_default(),
+                            ),
+                        ))
+                    })
+                    .collect();
+
+                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)
+                                }
+                            }
+                        }
+
+                        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, rustc } => {
+                let (public_deps, libproc_macro) =
+                    sysroot_to_crate_graph(&mut crate_graph, sysroot, target, load);
+
+                let mut cfg_options = CfgOptions::default();
+                cfg_options.extend(get_rustc_cfg_options(target));
+
+                let mut pkg_to_lib_crate = FxHashMap::default();
+
+                // Add test cfg for non-sysroot crates
+                cfg_options.insert_atom("test".into());
+                cfg_options.insert_atom("debug_assertions".into());
+
+                let mut pkg_crates = FxHashMap::default();
+
+                // Next, create crates for each package, target pair
+                for pkg in cargo.packages() {
+                    let mut lib_tgt = None;
+                    for &tgt in cargo[pkg].targets.iter() {
+                        if let Some(crate_id) = add_target_crate_root(
+                            &mut crate_graph,
+                            &cargo[pkg],
+                            &cargo[tgt],
+                            &cfg_options,
+                            proc_macro_client,
+                            load,
+                        ) {
+                            if cargo[tgt].kind == TargetKind::Lib {
+                                lib_tgt = Some((crate_id, cargo[tgt].name.clone()));
+                                pkg_to_lib_crate.insert(pkg, crate_id);
+                            }
+                            if cargo[tgt].is_proc_macro {
+                                if let Some(proc_macro) = libproc_macro {
+                                    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
+                                        )
+                                    }
+                                }
+                            }
+
+                            pkg_crates.entry(pkg).or_insert_with(Vec::new).push(crate_id);
+                        }
+                    }
+
+                    // 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() {
+                            // 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
+                                )
+                            }
+                        }
+                        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
+                                )
+                            }
+                        }
+                    }
+                }
+
+                // Now add a dep edge from all targets of upstream to the lib
+                // 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 let Err(_) = crate_graph.add_dep(from, name.clone(), to) {
+                                    log::error!(
+                                        "cyclic dependency {} -> {}",
+                                        &cargo[pkg].name,
+                                        &cargo[dep.pkg].name
+                                    )
+                                }
+                            }
+                        }
+                    }
+                }
+
+                let mut rustc_pkg_crates = FxHashMap::default();
+
+                // If the user provided a path to rustc sources, we add all the rustc_private crates
+                // and create dependencies on them for the crates in the current workspace
+                if let Some(rustc_workspace) = rustc {
+                    for pkg in rustc_workspace.packages() {
+                        for &tgt in rustc_workspace[pkg].targets.iter() {
+                            if rustc_workspace[tgt].kind != TargetKind::Lib {
+                                continue;
+                            }
+                            // Exclude alloc / core / std
+                            if rustc_workspace[tgt]
+                                .root
+                                .components()
+                                .any(|c| c == Component::Normal("library".as_ref()))
+                            {
+                                continue;
+                            }
+
+                            if let Some(crate_id) = add_target_crate_root(
+                                &mut crate_graph,
+                                &rustc_workspace[pkg],
+                                &rustc_workspace[tgt],
+                                &cfg_options,
+                                proc_macro_client,
+                                load,
+                            ) {
+                                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
+                                        )
+                                    }
+                                }
+                                rustc_pkg_crates.entry(pkg).or_insert_with(Vec::new).push(crate_id);
+                            }
+                        }
+                    }
+                    // Now add a dep edge from all targets of upstream to the lib
+                    // target of downstream.
+                    for pkg in rustc_workspace.packages() {
+                        for dep in rustc_workspace[pkg].dependencies.iter() {
+                            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 dependencies for all the crates of the current workspace to rustc_private libraries
+                    for dep in rustc_workspace.packages() {
+                        let name = CrateName::normalize_dashes(&rustc_workspace[dep].name);
+
+                        if let Some(&to) = pkg_to_lib_crate.get(&dep) {
+                            for pkg in cargo.packages() {
+                                if !cargo[pkg].is_member {
+                                    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
+                                        )
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        if crate_graph.patch_cfg_if() {
+            log::debug!("Patched std to depend on cfg-if")
+        } else {
+            log::debug!("Did not patch std to depend on cfg-if")
+        }
+        crate_graph
+    }
+}
+
+fn add_target_crate_root(
+    crate_graph: &mut CrateGraph,
+    pkg: &cargo_workspace::PackageData,
+    tgt: &cargo_workspace::TargetData,
+    cfg_options: &CfgOptions,
+    proc_macro_client: &ProcMacroClient,
+    load: &mut dyn FnMut(&AbsPath) -> Option<FileId>,
+) -> Option<CrateId> {
+    let root = tgt.root.as_path();
+    if let Some(file_id) = load(root) {
+        let edition = pkg.edition;
+        let cfg_options = {
+            let mut opts = cfg_options.clone();
+            for feature in pkg.features.iter() {
+                opts.insert_key_value("feature".into(), feature.into());
+            }
+            opts.extend(pkg.cfgs.iter().cloned());
+            opts
+        };
+        let mut env = Env::default();
+        if let Some(out_dir) = &pkg.out_dir {
+            // NOTE: cargo and rustc seem to hide non-UTF-8 strings from env! and option_env!()
+            if let Some(out_dir) = out_dir.to_str().map(|s| s.to_owned()) {
+                env.set("OUT_DIR", out_dir);
+            }
+        }
+        let proc_macro = pkg
+            .proc_macro_dylib_path
+            .as_ref()
+            .map(|it| proc_macro_client.by_dylib_path(&it))
+            .unwrap_or_default();
+
+        let display_name = CrateDisplayName::from_canonical_name(pkg.name.clone());
+        let crate_id = crate_graph.add_crate_root(
+            file_id,
+            edition,
+            Some(display_name),
+            cfg_options,
+            env,
+            proc_macro.clone(),
+        );
+
+        return Some(crate_id);
+    }
+    None
+}
+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 = CrateName::new(&sysroot[krate].name)
+                .expect("Sysroot crates' names do not contain dashes");
+            let crate_id = crate_graph.add_crate_root(
+                file_id,
+                Edition::Edition2018,
+                Some(name.into()),
+                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)
+}
+
+fn get_rustc_cfg_options(target: Option<&str>) -> Vec<CfgFlag> {
+    let mut res = Vec::new();
+
+    // Some nightly-only cfgs, which are required for stdlib
+    res.push(CfgFlag::Atom("target_thread_local".into()));
+    for &ty in ["8", "16", "32", "64", "cas", "ptr"].iter() {
+        for &key in ["target_has_atomic", "target_has_atomic_load_store"].iter() {
+            res.push(CfgFlag::KeyValue { key: key.to_string(), value: ty.into() });
+        }
+    }
+
+    let rustc_cfgs = {
+        let mut cmd = Command::new(toolchain::rustc());
+        cmd.args(&["--print", "cfg", "-O"]);
+        if let Some(target) = target {
+            cmd.args(&["--target", target]);
+        }
+        utf8_stdout(cmd)
+    };
+
+    match rustc_cfgs {
+        Ok(rustc_cfgs) => res.extend(rustc_cfgs.lines().map(|it| it.parse().unwrap())),
+        Err(e) => log::error!("failed to get rustc cfgs: {:#}", e),
+    }
+
+    res
+}