1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
13 use std::cell::RefCell;
14 use std::path::{Path, PathBuf};
15 use std::process::Command;
19 use std::collections::BTreeSet;
24 use util::{exe, libdir, add_lib_path};
26 use cache::{INTERNER, Interned, Cache};
28 use flags::Subcommand;
34 pub struct Builder<'a> {
39 stack: RefCell<Vec<Box<Any>>>,
42 impl<'a> Deref for Builder<'a> {
45 fn deref(&self) -> &Self::Target {
50 pub trait Step: 'static + Clone + Debug + PartialEq + Eq + Hash {
51 /// `PathBuf` when directories are created or to return a `Compiler` once
52 /// it's been assembled.
55 const DEFAULT: bool = false;
57 /// Run this rule for all hosts without cross compiling.
58 const ONLY_HOSTS: bool = false;
60 /// Run this rule for all targets, but only with the native host.
61 const ONLY_BUILD_TARGETS: bool = false;
63 /// Only run this step with the build triple as host and target.
64 const ONLY_BUILD: bool = false;
66 /// Primary function to execute this rule. Can call `builder.ensure(...)`
67 /// with other steps to run those.
68 fn run(self, builder: &Builder) -> Self::Output;
70 /// When bootstrap is passed a set of paths, this controls whether this rule
71 /// will execute. However, it does not get called in a "default" context
72 /// when we are not passed any paths; in that case, make_run is called
74 fn should_run(run: ShouldRun) -> ShouldRun;
76 /// Build up a "root" rule, either as a default rule or from a path passed
79 /// When path is `None`, we are executing in a context where no paths were
80 /// passed. When `./x.py build` is run, for example, this rule could get
81 /// called if it is in the correct list below with a path of `None`.
85 _host: Interned<String>,
86 _target: Interned<String>,
88 // It is reasonable to not have an implementation of make_run for rules
89 // who do not want to get called from the root context. This means that
90 // they are likely dependencies (e.g., sysroot creation) or similar, and
91 // as such calling them from ./x.py isn't logical.
96 struct StepDescription {
99 only_build_targets: bool,
101 should_run: fn(ShouldRun) -> ShouldRun,
102 make_run: fn(&Builder, Option<&Path>, Interned<String>, Interned<String>),
105 impl StepDescription {
106 fn from<S: Step>() -> StepDescription {
109 only_hosts: S::ONLY_HOSTS,
110 only_build_targets: S::ONLY_BUILD_TARGETS,
111 only_build: S::ONLY_BUILD,
112 should_run: S::should_run,
113 make_run: S::make_run,
117 fn maybe_run(&self, builder: &Builder, path: Option<&Path>) {
118 let build = builder.build;
119 let hosts = if self.only_build_targets || self.only_build {
120 &build.config.host[..1]
125 // Determine the actual targets participating in this rule.
126 // NOTE: We should keep the full projection from build triple to
127 // the hosts for the dist steps, now that the hosts array above is
128 // truncated to avoid duplication of work in that case. Therefore
129 // the original non-shadowed hosts array is used below.
130 let targets = if self.only_hosts {
131 // If --target was specified but --host wasn't specified,
132 // don't run any host-only tests. Also, respect any `--host`
133 // overrides as done for `hosts`.
134 if build.flags.host.len() > 0 {
135 &build.flags.host[..]
136 } else if build.flags.target.len() > 0 {
138 } else if self.only_build {
139 &build.config.host[..1]
141 &build.config.host[..]
148 for target in targets {
149 (self.make_run)(builder, path, *host, *target);
154 fn run(v: &[StepDescription], builder: &Builder, paths: &[PathBuf]) {
155 if paths.is_empty() {
158 desc.maybe_run(builder, None);
163 let mut attempted_run = false;
165 if (desc.should_run)(ShouldRun::new(builder)).run(path) {
166 attempted_run = true;
167 desc.maybe_run(builder, Some(path));
172 eprintln!("Warning: no rules matched {}.", path.display());
180 pub struct ShouldRun<'a> {
181 builder: &'a Builder<'a>,
182 // use a BTreeSet to maintain sort order
183 paths: BTreeSet<PathBuf>,
186 impl<'a> ShouldRun<'a> {
187 fn new(builder: &'a Builder) -> ShouldRun<'a> {
190 paths: BTreeSet::new(),
194 pub fn krate(mut self, name: &str) -> Self {
195 for (_, krate_path) in self.builder.crates(name) {
196 self.paths.insert(PathBuf::from(krate_path));
201 pub fn path(mut self, path: &str) -> Self {
202 self.paths.insert(PathBuf::from(path));
206 // allows being more explicit about why should_run in Step returns the value passed to it
207 pub fn never(self) -> ShouldRun<'a> {
211 fn run(&self, path: &Path) -> bool {
212 self.paths.iter().any(|p| path.ends_with(p))
216 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
226 impl<'a> Builder<'a> {
227 fn get_step_descriptions(kind: Kind) -> Vec<StepDescription> {
228 macro_rules! describe {
229 ($($rule:ty),+ $(,)*) => {{
230 vec![$(StepDescription::from::<$rule>()),+]
234 Kind::Build => describe!(compile::Std, compile::Test, compile::Rustc,
235 compile::StartupObjects, tool::BuildManifest, tool::Rustbook, tool::ErrorIndex,
236 tool::UnstableBookGen, tool::Tidy, tool::Linkchecker, tool::CargoTest,
237 tool::Compiletest, tool::RemoteTestServer, tool::RemoteTestClient,
238 tool::RustInstaller, tool::Cargo, tool::Rls),
239 Kind::Test => describe!(check::Tidy, check::Bootstrap, check::DefaultCompiletest,
240 check::HostCompiletest, check::Crate, check::CrateLibrustc, check::Linkcheck,
241 check::Cargotest, check::Cargo, check::Rls, check::Docs, check::ErrorIndex,
243 Kind::Bench => describe!(check::Crate, check::CrateLibrustc),
244 Kind::Doc => describe!(doc::UnstableBook, doc::UnstableBookGen, doc::TheBook,
245 doc::Standalone, doc::Std, doc::Test, doc::Rustc, doc::ErrorIndex, doc::Nomicon,
247 Kind::Dist => describe!(dist::Docs, dist::Mingw, dist::Rustc, dist::DebuggerScripts,
248 dist::Std, dist::Analysis, dist::Src, dist::PlainSourceTarball, dist::Cargo,
249 dist::Rls, dist::Extended, dist::HashSign),
250 Kind::Install => describe!(install::Docs, install::Std, install::Cargo, install::Rls,
251 install::Analysis, install::Src, install::Rustc),
255 pub fn get_help(build: &Build, subcommand: &str) -> Option<String> {
256 let kind = match subcommand {
257 "build" => Kind::Build,
259 "test" => Kind::Test,
260 "bench" => Kind::Bench,
261 "dist" => Kind::Dist,
262 "install" => Kind::Install,
266 let builder = Builder {
268 top_stage: build.flags.stage.unwrap_or(2),
271 stack: RefCell::new(Vec::new()),
274 let builder = &builder;
275 let mut should_run = ShouldRun::new(builder);
276 for desc in Builder::get_step_descriptions(builder.kind) {
277 should_run = (desc.should_run)(should_run);
279 let mut help = String::from("Available paths:\n");
280 for path in should_run.paths {
281 help.push_str(format!(" ./x.py {} {}\n", subcommand, path.display()).as_str());
286 pub fn run(build: &Build) {
287 let (kind, paths) = match build.flags.cmd {
288 Subcommand::Build { ref paths } => (Kind::Build, &paths[..]),
289 Subcommand::Doc { ref paths } => (Kind::Doc, &paths[..]),
290 Subcommand::Test { ref paths, .. } => (Kind::Test, &paths[..]),
291 Subcommand::Bench { ref paths, .. } => (Kind::Bench, &paths[..]),
292 Subcommand::Dist { ref paths } => (Kind::Dist, &paths[..]),
293 Subcommand::Install { ref paths } => (Kind::Install, &paths[..]),
294 Subcommand::Clean => panic!(),
297 let builder = Builder {
299 top_stage: build.flags.stage.unwrap_or(2),
302 stack: RefCell::new(Vec::new()),
305 StepDescription::run(&Builder::get_step_descriptions(builder.kind), &builder, paths);
308 pub fn default_doc(&self, paths: Option<&[PathBuf]>) {
309 let paths = paths.unwrap_or(&[]);
310 StepDescription::run(&Builder::get_step_descriptions(Kind::Doc), self, paths);
313 /// Obtain a compiler at a given stage and for a given host. Explictly does
314 /// not take `Compiler` since all `Compiler` instances are meant to be
315 /// obtained through this function, since it ensures that they are valid
316 /// (i.e., built and assembled).
317 pub fn compiler(&self, stage: u32, host: Interned<String>) -> Compiler {
318 self.ensure(compile::Assemble { target_compiler: Compiler { stage, host } })
321 pub fn sysroot(&self, compiler: Compiler) -> Interned<PathBuf> {
322 self.ensure(compile::Sysroot { compiler })
325 /// Returns the libdir where the standard library and other artifacts are
326 /// found for a compiler's sysroot.
327 pub fn sysroot_libdir(
328 &self, compiler: Compiler, target: Interned<String>
329 ) -> Interned<PathBuf> {
330 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
333 target: Interned<String>,
335 impl Step for Libdir {
336 type Output = Interned<PathBuf>;
338 fn should_run(run: ShouldRun) -> ShouldRun {
342 fn run(self, builder: &Builder) -> Interned<PathBuf> {
343 let compiler = self.compiler;
344 let lib = if compiler.stage >= 2 && builder.build.config.libdir_relative.is_some() {
345 builder.build.config.libdir_relative.clone().unwrap()
349 let sysroot = builder.sysroot(self.compiler).join(lib)
350 .join("rustlib").join(self.target).join("lib");
351 let _ = fs::remove_dir_all(&sysroot);
352 t!(fs::create_dir_all(&sysroot));
353 INTERNER.intern_path(sysroot)
356 self.ensure(Libdir { compiler, target })
359 /// Returns the compiler's libdir where it stores the dynamic libraries that
360 /// it itself links against.
362 /// For example this returns `<sysroot>/lib` on Unix and `<sysroot>/bin` on
364 pub fn rustc_libdir(&self, compiler: Compiler) -> PathBuf {
365 if compiler.is_snapshot(self) {
366 self.build.rustc_snapshot_libdir()
368 self.sysroot(compiler).join(libdir(&compiler.host))
372 /// Adds the compiler's directory of dynamic libraries to `cmd`'s dynamic
373 /// library lookup path.
374 pub fn add_rustc_lib_path(&self, compiler: Compiler, cmd: &mut Command) {
375 // Windows doesn't need dylib path munging because the dlls for the
376 // compiler live next to the compiler and the system will find them
382 add_lib_path(vec![self.rustc_libdir(compiler)], cmd);
385 /// Get a path to the compiler specified.
386 pub fn rustc(&self, compiler: Compiler) -> PathBuf {
387 if compiler.is_snapshot(self) {
388 self.initial_rustc.clone()
390 self.sysroot(compiler).join("bin").join(exe("rustc", &compiler.host))
394 /// Get the `rustdoc` executable next to the specified compiler
395 pub fn rustdoc(&self, compiler: Compiler) -> PathBuf {
396 let mut rustdoc = self.rustc(compiler);
398 rustdoc.push(exe("rustdoc", &compiler.host));
402 /// Prepares an invocation of `cargo` to be run.
404 /// This will create a `Command` that represents a pending execution of
405 /// Cargo. This cargo will be configured to use `compiler` as the actual
406 /// rustc compiler, its output will be scoped by `mode`'s output directory,
407 /// it will pass the `--target` flag for the specified `target`, and will be
408 /// executing the Cargo command `cmd`.
412 target: Interned<String>,
413 cmd: &str) -> Command {
414 let mut cargo = Command::new(&self.initial_cargo);
415 let out_dir = self.stage_out(compiler, mode);
416 cargo.env("CARGO_TARGET_DIR", out_dir)
418 .arg("-j").arg(self.jobs().to_string())
419 .arg("--target").arg(target);
421 // FIXME: Temporary fix for https://github.com/rust-lang/cargo/issues/3005
422 // Force cargo to output binaries with disambiguating hashes in the name
423 cargo.env("__CARGO_DEFAULT_LIB_METADATA", &self.config.channel);
426 if compiler.stage == 0 && self.local_rebuild {
427 // Assume the local-rebuild rustc already has stage1 features.
430 stage = compiler.stage;
433 // Customize the compiler we're running. Specify the compiler to cargo
434 // as our shim and then pass it some various options used to configure
435 // how the actual compiler itself is called.
437 // These variables are primarily all read by
438 // src/bootstrap/bin/{rustc.rs,rustdoc.rs}
439 cargo.env("RUSTBUILD_NATIVE_DIR", self.native_dir(target))
440 .env("RUSTC", self.out.join("bootstrap/debug/rustc"))
441 .env("RUSTC_REAL", self.rustc(compiler))
442 .env("RUSTC_STAGE", stage.to_string())
443 .env("RUSTC_CODEGEN_UNITS",
444 self.config.rust_codegen_units.to_string())
445 .env("RUSTC_DEBUG_ASSERTIONS",
446 self.config.rust_debug_assertions.to_string())
447 .env("RUSTC_SYSROOT", self.sysroot(compiler))
448 .env("RUSTC_LIBDIR", self.rustc_libdir(compiler))
449 .env("RUSTC_RPATH", self.config.rust_rpath.to_string())
450 .env("RUSTDOC", self.out.join("bootstrap/debug/rustdoc"))
451 .env("RUSTDOC_REAL", self.rustdoc(compiler))
452 .env("RUSTC_FLAGS", self.rustc_flags(target).join(" "));
454 if mode != Mode::Tool {
455 // Tools don't get debuginfo right now, e.g. cargo and rls don't
456 // get compiled with debuginfo.
457 cargo.env("RUSTC_DEBUGINFO", self.config.rust_debuginfo.to_string())
458 .env("RUSTC_DEBUGINFO_LINES", self.config.rust_debuginfo_lines.to_string())
459 .env("RUSTC_FORCE_UNSTABLE", "1");
461 // Currently the compiler depends on crates from crates.io, and
462 // then other crates can depend on the compiler (e.g. proc-macro
463 // crates). Let's say, for example that rustc itself depends on the
464 // bitflags crate. If an external crate then depends on the
465 // bitflags crate as well, we need to make sure they don't
466 // conflict, even if they pick the same verison of bitflags. We'll
467 // want to make sure that e.g. a plugin and rustc each get their
468 // own copy of bitflags.
470 // Cargo ensures that this works in general through the -C metadata
471 // flag. This flag will frob the symbols in the binary to make sure
472 // they're different, even though the source code is the exact
473 // same. To solve this problem for the compiler we extend Cargo's
474 // already-passed -C metadata flag with our own. Our rustc.rs
475 // wrapper around the actual rustc will detect -C metadata being
476 // passed and frob it with this extra string we're passing in.
477 cargo.env("RUSTC_METADATA_SUFFIX", "rustc");
480 // Enable usage of unstable features
481 cargo.env("RUSTC_BOOTSTRAP", "1");
482 self.add_rust_test_threads(&mut cargo);
484 // Almost all of the crates that we compile as part of the bootstrap may
485 // have a build script, including the standard library. To compile a
486 // build script, however, it itself needs a standard library! This
487 // introduces a bit of a pickle when we're compiling the standard
490 // To work around this we actually end up using the snapshot compiler
491 // (stage0) for compiling build scripts of the standard library itself.
492 // The stage0 compiler is guaranteed to have a libstd available for use.
494 // For other crates, however, we know that we've already got a standard
495 // library up and running, so we can use the normal compiler to compile
496 // build scripts in that situation.
497 if mode == Mode::Libstd {
498 cargo.env("RUSTC_SNAPSHOT", &self.initial_rustc)
499 .env("RUSTC_SNAPSHOT_LIBDIR", self.rustc_snapshot_libdir());
501 cargo.env("RUSTC_SNAPSHOT", self.rustc(compiler))
502 .env("RUSTC_SNAPSHOT_LIBDIR", self.rustc_libdir(compiler));
505 // Ignore incremental modes except for stage0, since we're
506 // not guaranteeing correctness across builds if the compiler
507 // is changing under your feet.`
508 if self.flags.incremental && compiler.stage == 0 {
509 let incr_dir = self.incremental_dir(compiler);
510 cargo.env("RUSTC_INCREMENTAL", incr_dir);
513 if let Some(ref on_fail) = self.flags.on_fail {
514 cargo.env("RUSTC_ON_FAIL", on_fail);
517 cargo.env("RUSTC_VERBOSE", format!("{}", self.verbosity));
519 // Specify some various options for build scripts used throughout
522 // FIXME: the guard against msvc shouldn't need to be here
523 if !target.contains("msvc") {
524 cargo.env(format!("CC_{}", target), self.cc(target))
525 .env(format!("AR_{}", target), self.ar(target).unwrap()) // only msvc is None
526 .env(format!("CFLAGS_{}", target), self.cflags(target).join(" "));
528 if let Ok(cxx) = self.cxx(target) {
529 cargo.env(format!("CXX_{}", target), cxx);
533 if mode == Mode::Libstd && self.config.extended && compiler.is_final_stage(self) {
534 cargo.env("RUSTC_SAVE_ANALYSIS", "api".to_string());
537 // Environment variables *required* throughout the build
539 // FIXME: should update code to not require this env var
540 cargo.env("CFG_COMPILER_HOST_TRIPLE", target);
542 if self.is_verbose() {
545 // FIXME: cargo bench does not accept `--release`
546 if self.config.rust_optimize && cmd != "bench" {
547 cargo.arg("--release");
549 if self.config.locked_deps {
550 cargo.arg("--locked");
552 if self.config.vendor || self.is_sudo {
553 cargo.arg("--frozen");
556 self.ci_env.force_coloring_in_ci(&mut cargo);
561 /// Ensure that a given step is built, returning it's output. This will
562 /// cache the step, so it is safe (and good!) to call this as often as
563 /// needed to ensure that all dependencies are built.
564 pub fn ensure<S: Step>(&'a self, step: S) -> S::Output {
566 let mut stack = self.stack.borrow_mut();
567 for stack_step in stack.iter() {
569 if stack_step.downcast_ref::<S>().map_or(true, |stack_step| *stack_step != step) {
572 let mut out = String::new();
573 out += &format!("\n\nCycle in build detected when adding {:?}\n", step);
574 for el in stack.iter().rev() {
575 out += &format!("\t{:?}\n", el);
579 if let Some(out) = self.cache.get(&step) {
580 self.build.verbose(&format!("{}c {:?}", " ".repeat(stack.len()), step));
584 self.build.verbose(&format!("{}> {:?}", " ".repeat(stack.len()), step));
585 stack.push(Box::new(step.clone()));
587 let out = step.clone().run(self);
589 let mut stack = self.stack.borrow_mut();
590 let cur_step = stack.pop().expect("step stack empty");
591 assert_eq!(cur_step.downcast_ref(), Some(&step));
593 self.build.verbose(&format!("{}< {:?}", " ".repeat(self.stack.borrow().len()), step));
594 self.cache.put(step, out.clone());