rust/crates/project_model/src/workspace.rs

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//! Handles lowering of build-system specific workspace information (`cargo
//! metadata` or `rust-project.json`) into representation stored in the salsa
//! database -- `CrateGraph`.
use std::{collections::VecDeque, fmt, fs, path::Path, process::Command};
use anyhow::{Context, Result};
use base_db::{CrateDisplayName, CrateGraph, CrateId, CrateName, Edition, Env, FileId, ProcMacro};
use cfg::CfgOptions;
use paths::{AbsPath, AbsPathBuf};
use proc_macro_api::ProcMacroClient;
use rustc_hash::{FxHashMap, FxHashSet};
use crate::{
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build_data::{BuildData, BuildDataMap, BuildDataResult},
cargo_workspace,
cfg_flag::CfgFlag,
rustc_cfg,
sysroot::SysrootCrate,
utf8_stdout, BuildDataCollector, 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>,
/// Holds cfg flags for the current target. We get those by running
/// `rustc --print cfg`.
///
/// FIXME: make this a per-crate map, as, eg, build.rs might have a
/// different target.
rustc_cfg: Vec<CfgFlag>,
},
/// Project workspace was manually specified using a `rust-project.json` file.
Json { project: ProjectJson, sysroot: Option<Sysroot>, rustc_cfg: Vec<CfgFlag> },
}
impl fmt::Debug for ProjectWorkspace {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
// Make sure this isn't too verbose.
match self {
ProjectWorkspace::Cargo { cargo, sysroot, rustc, rustc_cfg } => 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()),
)
.field("n_rustc_cfg", &rustc_cfg.len())
.finish(),
ProjectWorkspace::Json { project, sysroot, rustc_cfg } => {
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.field("n_rustc_cfg", &rustc_cfg.len());
debug_struct.finish()
}
}
}
}
impl ProjectWorkspace {
pub fn load(
manifest: ProjectManifest,
config: &CargoConfig,
progress: &dyn Fn(String),
) -> 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();
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let project_json = ProjectJson::new(&project_location, data);
ProjectWorkspace::load_inline(project_json, config.target.as_deref())?
}
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, progress)
.with_context(|| {
format!(
"Failed to read Cargo metadata from Cargo.toml file {}, {}",
cargo_toml.display(),
cargo_version
)
})?;
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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_dir = if let Some(rustc_source) = &config.rustc_source {
use cargo_workspace::RustcSource;
match rustc_source {
RustcSource::Path(path) => Some(path.clone()),
RustcSource::Discover => Sysroot::discover_rustc(&cargo_toml),
}
} else {
None
};
let rustc = if let Some(rustc_dir) = rustc_dir {
Some(
CargoWorkspace::from_cargo_metadata(&rustc_dir, config, progress)
.with_context(|| {
format!("Failed to read Cargo metadata for Rust sources")
})?,
)
} else {
None
};
let rustc_cfg = rustc_cfg::get(config.target.as_deref());
ProjectWorkspace::Cargo { cargo, sysroot, rustc, rustc_cfg }
}
};
Ok(res)
}
pub fn load_inline(
project_json: ProjectJson,
target: Option<&str>,
) -> Result<ProjectWorkspace> {
let sysroot = match &project_json.sysroot_src {
Some(path) => Some(Sysroot::load(path)?),
None => None,
};
let rustc_cfg = rustc_cfg::get(target);
Ok(ProjectWorkspace::Json { project: project_json, sysroot, rustc_cfg })
}
/// 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
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pub fn to_roots(&self, build_data: Option<&BuildDataResult>) -> Vec<PackageRoot> {
match self {
ProjectWorkspace::Json { project, sysroot, rustc_cfg: _ } => 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, rustc_cfg: _ } => cargo
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.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()];
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include.extend(
build_data
.and_then(|it| it.get(cargo.workspace_root()))
.and_then(|map| map.get(&cargo[pkg].id))
.and_then(|it| it.out_dir.clone()),
);
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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,
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include: vec![rustc[krate].root().to_path_buf()],
exclude: Vec::new(),
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})
}))
.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,
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build_data: Option<&BuildDataResult>,
proc_macro_client: Option<&ProcMacroClient>,
load: &mut dyn FnMut(&AbsPath) -> Option<FileId>,
) -> CrateGraph {
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let _p = profile::span("ProjectWorkspace::to_crate_graph");
let proc_macro_loader = |path: &Path| match proc_macro_client {
Some(client) => client.by_dylib_path(path),
None => Vec::new(),
};
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let mut crate_graph = match self {
ProjectWorkspace::Json { project, sysroot, rustc_cfg } => project_json_to_crate_graph(
rustc_cfg.clone(),
&proc_macro_loader,
load,
project,
sysroot,
),
ProjectWorkspace::Cargo { cargo, sysroot, rustc, rustc_cfg } => cargo_to_crate_graph(
rustc_cfg.clone(),
&proc_macro_loader,
load,
cargo,
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build_data.and_then(|it| it.get(cargo.workspace_root())),
sysroot,
rustc,
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rustc.as_ref().zip(build_data).and_then(|(it, map)| map.get(it.workspace_root())),
),
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};
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
}
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pub fn collect_build_data_configs(&self, collector: &mut BuildDataCollector) {
match self {
ProjectWorkspace::Cargo { cargo, rustc, .. } => {
collector.add_config(&cargo.workspace_root(), cargo.build_data_config().clone());
if let Some(rustc) = rustc {
collector.add_config(rustc.workspace_root(), rustc.build_data_config().clone());
}
}
_ => {}
}
}
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}
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fn project_json_to_crate_graph(
rustc_cfg: Vec<CfgFlag>,
proc_macro_loader: &dyn Fn(&Path) -> Vec<ProcMacro>,
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load: &mut dyn FnMut(&AbsPath) -> Option<FileId>,
project: &ProjectJson,
sysroot: &Option<Sysroot>,
) -> CrateGraph {
let mut crate_graph = CrateGraph::default();
let sysroot_deps = sysroot
.as_ref()
.map(|sysroot| sysroot_to_crate_graph(&mut crate_graph, sysroot, rustc_cfg.clone(), load));
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let mut cfg_cache: FxHashMap<&str, Vec<CfgFlag>> = FxHashMap::default();
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let crates: FxHashMap<CrateId, CrateId> = project
.crates()
.filter_map(|(crate_id, krate)| {
let file_path = &krate.root_module;
let file_id = load(&file_path)?;
Some((crate_id, krate, file_id))
})
.map(|(crate_id, krate, file_id)| {
let env = krate.env.clone().into_iter().collect();
let proc_macro = krate.proc_macro_dylib_path.clone().map(|it| proc_macro_loader(&it));
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let target_cfgs = match krate.target.as_deref() {
Some(target) => {
cfg_cache.entry(target).or_insert_with(|| rustc_cfg::get(Some(target)))
}
None => &rustc_cfg,
};
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let mut cfg_options = CfgOptions::default();
cfg_options.extend(target_cfgs.iter().chain(krate.cfg.iter()).cloned());
(
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_deps {
for (name, to) in public_deps.iter() {
add_dep(&mut crate_graph, from, name.clone(), *to)
}
}
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for dep in &krate.deps {
if let Some(&to) = crates.get(&dep.crate_id) {
add_dep(&mut crate_graph, from, dep.name.clone(), to)
}
}
}
}
crate_graph
}
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fn cargo_to_crate_graph(
rustc_cfg: Vec<CfgFlag>,
proc_macro_loader: &dyn Fn(&Path) -> Vec<ProcMacro>,
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load: &mut dyn FnMut(&AbsPath) -> Option<FileId>,
cargo: &CargoWorkspace,
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build_data_map: Option<&BuildDataMap>,
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sysroot: &Sysroot,
rustc: &Option<CargoWorkspace>,
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rustc_build_data_map: Option<&BuildDataMap>,
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) -> CrateGraph {
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let _p = profile::span("cargo_to_crate_graph");
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let mut crate_graph = CrateGraph::default();
let (public_deps, libproc_macro) =
sysroot_to_crate_graph(&mut crate_graph, sysroot, rustc_cfg.clone(), load);
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let mut cfg_options = CfgOptions::default();
cfg_options.extend(rustc_cfg);
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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() {
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if let Some(file_id) = load(&cargo[tgt].root) {
let crate_id = add_target_crate_root(
&mut crate_graph,
&cargo[pkg],
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build_data_map.and_then(|it| it.get(&cargo[pkg].id)),
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&cfg_options,
proc_macro_loader,
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file_id,
);
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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 {
add_dep(
&mut crate_graph,
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crate_id,
CrateName::new("proc_macro").unwrap(),
proc_macro,
);
}
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}
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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() {
if to != from {
// 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);
add_dep(&mut crate_graph, from, name, to);
}
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}
for (name, krate) in public_deps.iter() {
add_dep(&mut crate_graph, from, name.clone(), *krate);
}
}
}
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// 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() {
add_dep(&mut crate_graph, from, name.clone(), to)
}
}
}
}
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 which opt-in to that
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if let Some(rustc_workspace) = rustc {
// rustc-dev crates start from 'rustc_driver'
// Therefore, we collect all crates which are transitive dependencies of rustc_driver
if let Some(root_pkg) = rustc_workspace
.packages()
.find(|package| rustc_workspace[*package].name == "rustc_driver")
{
let mut queue = VecDeque::new();
queue.push_back(root_pkg);
while let Some(pkg) = queue.pop_front() {
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if rustc_pkg_crates.contains_key(&pkg) {
continue;
}
for dep in &rustc_workspace[pkg].dependencies {
queue.push_back(dep.pkg);
}
for &tgt in rustc_workspace[pkg].targets.iter() {
if rustc_workspace[tgt].kind != TargetKind::Lib {
continue;
}
if let Some(file_id) = load(&rustc_workspace[tgt].root) {
let crate_id = add_target_crate_root(
&mut crate_graph,
&rustc_workspace[pkg],
rustc_build_data_map.and_then(|it| it.get(&rustc_workspace[pkg].id)),
&cfg_options,
proc_macro_loader,
file_id,
);
pkg_to_lib_crate.insert(pkg, crate_id);
// Add dependencies on the core / std / alloc for rustc
for (name, krate) in public_deps.iter() {
add_dep(&mut crate_graph, crate_id, name.clone(), *krate);
}
rustc_pkg_crates.entry(pkg).or_insert_with(Vec::new).push(crate_id);
}
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}
}
}
// Now add a dep edge from all targets of upstream to the lib
// target of downstream.
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for pkg in rustc_pkg_crates.keys().copied() {
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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() {
add_dep(&mut crate_graph, from, name.clone(), to);
}
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}
}
}
// Add dependencies for all crates which opt in to rustc_private libraries
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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() {
let package = &cargo[pkg];
if matches!(
(package.is_member, package.metadata.rustc_private),
(true, Some(false)) | (false, Some(false)) | (false, None)
) {
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continue;
}
for &from in pkg_crates.get(&pkg).into_iter().flatten() {
// Avoid creating duplicate dependencies
if !crate_graph[from].dependencies.iter().any(|d| d.name == name) {
add_dep(&mut crate_graph, from, name.clone(), to);
} else {
eprintln!(
"Skipped {} for {:?}",
&name, &crate_graph[from].display_name
);
}
}
}
}
}
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} else {
eprintln!("No cargo workspace");
}
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crate_graph
}
fn add_target_crate_root(
crate_graph: &mut CrateGraph,
pkg: &cargo_workspace::PackageData,
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build_data: Option<&BuildData>,
cfg_options: &CfgOptions,
proc_macro_loader: &dyn Fn(&Path) -> Vec<ProcMacro>,
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file_id: FileId,
) -> CrateId {
let edition = pkg.edition;
let cfg_options = {
let mut opts = cfg_options.clone();
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for feature in pkg.active_features.iter() {
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opts.insert_key_value("feature".into(), feature.into());
}
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if let Some(cfgs) = build_data.as_ref().map(|it| &it.cfgs) {
opts.extend(cfgs.iter().cloned());
}
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opts
};
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let mut env = Env::default();
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if let Some(envs) = build_data.map(|it| &it.envs) {
for (k, v) in envs {
env.set(k, v.clone());
}
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}
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let proc_macro = build_data
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.as_ref()
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.and_then(|it| it.proc_macro_dylib_path.as_ref())
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.map(|it| proc_macro_loader(&it))
.unwrap_or_default();
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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,
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proc_macro,
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);
crate_id
}
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fn sysroot_to_crate_graph(
crate_graph: &mut CrateGraph,
sysroot: &Sysroot,
rustc_cfg: Vec<CfgFlag>,
load: &mut dyn FnMut(&AbsPath) -> Option<FileId>,
) -> (Vec<(CrateName, CrateId)>, Option<CrateId>) {
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let _p = profile::span("sysroot_to_crate_graph");
let mut cfg_options = CfgOptions::default();
cfg_options.extend(rustc_cfg);
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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![];
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let display_name = CrateDisplayName::from_canonical_name(sysroot[krate].name.clone());
let crate_id = crate_graph.add_crate_root(
file_id,
Edition::Edition2018,
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Some(display_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)) {
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add_dep(crate_graph, from, name, to);
}
}
}
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)
}
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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)
}
}