src/librustdoc/test.rs

   1 // Copyright 2013-2014 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.
   4 //
   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.
  10
  11 #![allow(deprecated)]
  12
  13 use std::cell::{RefCell, Cell};
  14 use std::collections::{HashSet, HashMap};
  15 use std::dynamic_lib::DynamicLibrary;
  16 use std::env;
  17 use std::ffi::OsString;
  18 use std::io::prelude::*;
  19 use std::io;
  20 use std::path::PathBuf;
  21 use std::process::Command;
  22 use std::rc::Rc;
  23 use std::str;
  24 use std::sync::{Arc, Mutex};
  25
  26 use testing;
  27 use rustc_lint;
  28 use rustc::front::map as hir_map;
  29 use rustc::session::{self, config};
  30 use rustc::session::config::{get_unstable_features_setting, OutputType};
  31 use rustc::session::search_paths::{SearchPaths, PathKind};
  32 use rustc_front::lowering::{lower_crate, LoweringContext};
  33 use rustc_back::tempdir::TempDir;
  34 use rustc_driver::{driver, Compilation};
  35 use rustc_metadata::cstore::CStore;
  36 use syntax::codemap::CodeMap;
  37 use syntax::diagnostic;
  38 use syntax::parse::token;
  39
  40 use core;
  41 use clean;
  42 use clean::Clean;
  43 use fold::DocFolder;
  44 use html::markdown;
  45 use passes;
  46 use visit_ast::RustdocVisitor;
  47
  48 #[derive(Clone, Default)]
  49 pub struct TestOptions {
  50     pub no_crate_inject: bool,
  51     pub attrs: Vec<String>,
  52 }
  53
  54 pub fn run(input: &str,
  55            cfgs: Vec<String>,
  56            libs: SearchPaths,
  57            externs: core::Externs,
  58            mut test_args: Vec<String>,
  59            crate_name: Option<String>)
  60            -> isize {
  61     let input_path = PathBuf::from(input);
  62     let input = config::Input::File(input_path.clone());
  63
  64     let sessopts = config::Options {
  65         maybe_sysroot: Some(env::current_exe().unwrap().parent().unwrap()
  66                                               .parent().unwrap().to_path_buf()),
  67         search_paths: libs.clone(),
  68         crate_types: vec!(config::CrateTypeDylib),
  69         externs: externs.clone(),
  70         unstable_features: get_unstable_features_setting(),
  71         ..config::basic_options().clone()
  72     };
  73
  74     let codemap = CodeMap::new();
  75     let diagnostic_handler = diagnostic::Handler::new(diagnostic::Auto, None, true);
  76     let span_diagnostic_handler =
  77     diagnostic::SpanHandler::new(diagnostic_handler, codemap);
  78
  79     let cstore = Rc::new(CStore::new(token::get_ident_interner()));
  80     let cstore_ = ::rustc_driver::cstore_to_cratestore(cstore.clone());
  81     let sess = session::build_session_(sessopts,
  82                                        Some(input_path.clone()),
  83                                        span_diagnostic_handler,
  84                                        cstore_);
  85     rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
  86
  87     let mut cfg = config::build_configuration(&sess);
  88     cfg.extend(config::parse_cfgspecs(cfgs.clone()));
  89     let krate = driver::phase_1_parse_input(&sess, cfg, &input);
  90     let krate = driver::phase_2_configure_and_expand(&sess, &cstore, krate,
  91                                                      "rustdoc-test", None)
  92         .expect("phase_2_configure_and_expand aborted in rustdoc!");
  93     let krate = driver::assign_node_ids(&sess, krate);
  94     let lcx = LoweringContext::new(&sess, Some(&krate));
  95     let krate = lower_crate(&lcx, &krate);
  96
  97     let opts = scrape_test_config(&krate);
  98
  99     let mut forest = hir_map::Forest::new(krate);
 100     let map = hir_map::map_crate(&mut forest);
 101
 102     let ctx = core::DocContext {
 103         map: &map,
 104         maybe_typed: core::NotTyped(&sess),
 105         input: input,
 106         external_paths: RefCell::new(Some(HashMap::new())),
 107         external_traits: RefCell::new(None),
 108         external_typarams: RefCell::new(None),
 109         inlined: RefCell::new(None),
 110         populated_crate_impls: RefCell::new(HashSet::new()),
 111         deref_trait_did: Cell::new(None),
 112     };
 113
 114     let mut v = RustdocVisitor::new(&ctx, None);
 115     v.visit(ctx.map.krate());
 116     let mut krate = v.clean(&ctx);
 117     match crate_name {
 118         Some(name) => krate.name = name,
 119         None => {}
 120     }
 121     let (krate, _) = passes::collapse_docs(krate);
 122     let (krate, _) = passes::unindent_comments(krate);
 123
 124     let mut collector = Collector::new(krate.name.to_string(),
 125                                        cfgs,
 126                                        libs,
 127                                        externs,
 128                                        false,
 129                                        opts);
 130     collector.fold_crate(krate);
 131
 132     test_args.insert(0, "rustdoctest".to_string());
 133
 134     testing::test_main(&test_args,
 135                        collector.tests.into_iter().collect());
 136     0
 137 }
 138
 139 // Look for #![doc(test(no_crate_inject))], used by crates in the std facade
 140 fn scrape_test_config(krate: &::rustc_front::hir::Crate) -> TestOptions {
 141     use syntax::attr::AttrMetaMethods;
 142     use syntax::print::pprust;
 143
 144     let mut opts = TestOptions {
 145         no_crate_inject: false,
 146         attrs: Vec::new(),
 147     };
 148
 149     let attrs = krate.attrs.iter()
 150                      .filter(|a| a.check_name("doc"))
 151                      .filter_map(|a| a.meta_item_list())
 152                      .flat_map(|l| l)
 153                      .filter(|a| a.check_name("test"))
 154                      .filter_map(|a| a.meta_item_list())
 155                      .flat_map(|l| l);
 156     for attr in attrs {
 157         if attr.check_name("no_crate_inject") {
 158             opts.no_crate_inject = true;
 159         }
 160         if attr.check_name("attr") {
 161             if let Some(l) = attr.meta_item_list() {
 162                 for item in l {
 163                     opts.attrs.push(pprust::meta_item_to_string(item));
 164                 }
 165             }
 166         }
 167     }
 168
 169     return opts;
 170 }
 171
 172 fn runtest(test: &str, cratename: &str, cfgs: Vec<String>, libs: SearchPaths,
 173            externs: core::Externs,
 174            should_panic: bool, no_run: bool, as_test_harness: bool,
 175            opts: &TestOptions) {
 176     // the test harness wants its own `main` & top level functions, so
 177     // never wrap the test in `fn main() { ... }`
 178     let test = maketest(test, Some(cratename), as_test_harness, opts);
 179     let input = config::Input::Str(test.to_string());
 180     let mut outputs = HashMap::new();
 181     outputs.insert(OutputType::Exe, None);
 182
 183     let sessopts = config::Options {
 184         maybe_sysroot: Some(env::current_exe().unwrap().parent().unwrap()
 185                                               .parent().unwrap().to_path_buf()),
 186         search_paths: libs,
 187         crate_types: vec!(config::CrateTypeExecutable),
 188         output_types: outputs,
 189         externs: externs,
 190         cg: config::CodegenOptions {
 191             prefer_dynamic: true,
 192             .. config::basic_codegen_options()
 193         },
 194         test: as_test_harness,
 195         unstable_features: get_unstable_features_setting(),
 196         ..config::basic_options().clone()
 197     };
 198
 199     // Shuffle around a few input and output handles here. We're going to pass
 200     // an explicit handle into rustc to collect output messages, but we also
 201     // want to catch the error message that rustc prints when it fails.
 202     //
 203     // We take our thread-local stderr (likely set by the test runner) and replace
 204     // it with a sink that is also passed to rustc itself. When this function
 205     // returns the output of the sink is copied onto the output of our own thread.
 206     //
 207     // The basic idea is to not use a default Handler for rustc, and then also
 208     // not print things by default to the actual stderr.
 209     struct Sink(Arc<Mutex<Vec<u8>>>);
 210     impl Write for Sink {
 211         fn write(&mut self, data: &[u8]) -> io::Result<usize> {
 212             Write::write(&mut *self.0.lock().unwrap(), data)
 213         }
 214         fn flush(&mut self) -> io::Result<()> { Ok(()) }
 215     }
 216     struct Bomb(Arc<Mutex<Vec<u8>>>, Box<Write+Send>);
 217     impl Drop for Bomb {
 218         fn drop(&mut self) {
 219             let _ = self.1.write_all(&self.0.lock().unwrap());
 220         }
 221     }
 222     let data = Arc::new(Mutex::new(Vec::new()));
 223     let emitter = diagnostic::EmitterWriter::new(box Sink(data.clone()), None);
 224     let old = io::set_panic(box Sink(data.clone()));
 225     let _bomb = Bomb(data, old.unwrap_or(box io::stdout()));
 226
 227     // Compile the code
 228     let codemap = CodeMap::new();
 229     let diagnostic_handler = diagnostic::Handler::with_emitter(true, box emitter);
 230     let span_diagnostic_handler =
 231         diagnostic::SpanHandler::new(diagnostic_handler, codemap);
 232
 233     let cstore = Rc::new(CStore::new(token::get_ident_interner()));
 234     let cstore_ = ::rustc_driver::cstore_to_cratestore(cstore.clone());
 235     let sess = session::build_session_(sessopts,
 236                                        None,
 237                                        span_diagnostic_handler,
 238                                        cstore_);
 239     rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
 240
 241     let outdir = TempDir::new("rustdoctest").ok().expect("rustdoc needs a tempdir");
 242     let out = Some(outdir.path().to_path_buf());
 243     let mut cfg = config::build_configuration(&sess);
 244     cfg.extend(config::parse_cfgspecs(cfgs));
 245     let libdir = sess.target_filesearch(PathKind::All).get_lib_path();
 246     let mut control = driver::CompileController::basic();
 247     if no_run {
 248         control.after_analysis.stop = Compilation::Stop;
 249     }
 250     driver::compile_input(sess, &cstore, cfg, &input, &out, &None, None, control);
 251
 252     if no_run { return }
 253
 254     // Run the code!
 255     //
 256     // We're careful to prepend the *target* dylib search path to the child's
 257     // environment to ensure that the target loads the right libraries at
 258     // runtime. It would be a sad day if the *host* libraries were loaded as a
 259     // mistake.
 260     let mut cmd = Command::new(&outdir.path().join("rust_out"));
 261     let var = DynamicLibrary::envvar();
 262     let newpath = {
 263         let path = env::var_os(var).unwrap_or(OsString::new());
 264         let mut path = env::split_paths(&path).collect::<Vec<_>>();
 265         path.insert(0, libdir.clone());
 266         env::join_paths(path).unwrap()
 267     };
 268     cmd.env(var, &newpath);
 269
 270     match cmd.output() {
 271         Err(e) => panic!("couldn't run the test: {}{}", e,
 272                         if e.kind() == io::ErrorKind::PermissionDenied {
 273                             " - maybe your tempdir is mounted with noexec?"
 274                         } else { "" }),
 275         Ok(out) => {
 276             if should_panic && out.status.success() {
 277                 panic!("test executable succeeded when it should have failed");
 278             } else if !should_panic && !out.status.success() {
 279                 panic!("test executable failed:\n{}\n{}",
 280                        str::from_utf8(&out.stdout).unwrap_or(""),
 281                        str::from_utf8(&out.stderr).unwrap_or(""));
 282             }
 283         }
 284     }
 285 }
 286
 287 pub fn maketest(s: &str, cratename: Option<&str>, dont_insert_main: bool,
 288                 opts: &TestOptions) -> String {
 289     let (crate_attrs, everything_else) = partition_source(s);
 290
 291     let mut prog = String::new();
 292
 293     // First push any outer attributes from the example, assuming they
 294     // are intended to be crate attributes.
 295     prog.push_str(&crate_attrs);
 296
 297     // Next, any attributes for other aspects such as lints.
 298     for attr in &opts.attrs {
 299         prog.push_str(&format!("#![{}]\n", attr));
 300     }
 301
 302     // Don't inject `extern crate std` because it's already injected by the
 303     // compiler.
 304     if !s.contains("extern crate") && !opts.no_crate_inject && cratename != Some("std") {
 305         match cratename {
 306             Some(cratename) => {
 307                 if s.contains(cratename) {
 308                     prog.push_str(&format!("extern crate {};\n", cratename));
 309                 }
 310             }
 311             None => {}
 312         }
 313     }
 314     if dont_insert_main || s.contains("fn main") {
 315         prog.push_str(&everything_else);
 316     } else {
 317         prog.push_str("fn main() {\n    ");
 318         prog.push_str(&everything_else.replace("\n", "\n    "));
 319         prog.push_str("\n}");
 320     }
 321
 322     info!("final test program: {}", prog);
 323
 324     return prog
 325 }
 326
 327 fn partition_source(s: &str) -> (String, String) {
 328     use rustc_unicode::str::UnicodeStr;
 329
 330     let mut after_header = false;
 331     let mut before = String::new();
 332     let mut after = String::new();
 333
 334     for line in s.lines() {
 335         let trimline = line.trim();
 336         let header = trimline.is_whitespace() ||
 337             trimline.starts_with("#![feature");
 338         if !header || after_header {
 339             after_header = true;
 340             after.push_str(line);
 341             after.push_str("\n");
 342         } else {
 343             before.push_str(line);
 344             before.push_str("\n");
 345         }
 346     }
 347
 348     return (before, after);
 349 }
 350
 351 pub struct Collector {
 352     pub tests: Vec<testing::TestDescAndFn>,
 353     names: Vec<String>,
 354     cfgs: Vec<String>,
 355     libs: SearchPaths,
 356     externs: core::Externs,
 357     cnt: usize,
 358     use_headers: bool,
 359     current_header: Option<String>,
 360     cratename: String,
 361     opts: TestOptions,
 362 }
 363
 364 impl Collector {
 365     pub fn new(cratename: String, cfgs: Vec<String>, libs: SearchPaths, externs: core::Externs,
 366                use_headers: bool, opts: TestOptions) -> Collector {
 367         Collector {
 368             tests: Vec::new(),
 369             names: Vec::new(),
 370             cfgs: cfgs,
 371             libs: libs,
 372             externs: externs,
 373             cnt: 0,
 374             use_headers: use_headers,
 375             current_header: None,
 376             cratename: cratename,
 377             opts: opts,
 378         }
 379     }
 380
 381     pub fn add_test(&mut self, test: String,
 382                     should_panic: bool, no_run: bool, should_ignore: bool,
 383                     as_test_harness: bool) {
 384         let name = if self.use_headers {
 385             let s = self.current_header.as_ref().map(|s| &**s).unwrap_or("");
 386             format!("{}_{}", s, self.cnt)
 387         } else {
 388             format!("{}_{}", self.names.join("::"), self.cnt)
 389         };
 390         self.cnt += 1;
 391         let cfgs = self.cfgs.clone();
 392         let libs = self.libs.clone();
 393         let externs = self.externs.clone();
 394         let cratename = self.cratename.to_string();
 395         let opts = self.opts.clone();
 396         debug!("Creating test {}: {}", name, test);
 397         self.tests.push(testing::TestDescAndFn {
 398             desc: testing::TestDesc {
 399                 name: testing::DynTestName(name),
 400                 ignore: should_ignore,
 401                 // compiler failures are test failures
 402                 should_panic: testing::ShouldPanic::No,
 403             },
 404             testfn: testing::DynTestFn(Box::new(move|| {
 405                 runtest(&test,
 406                         &cratename,
 407                         cfgs,
 408                         libs,
 409                         externs,
 410                         should_panic,
 411                         no_run,
 412                         as_test_harness,
 413                         &opts);
 414             }))
 415         });
 416     }
 417
 418     pub fn register_header(&mut self, name: &str, level: u32) {
 419         if self.use_headers && level == 1 {
 420             // we use these headings as test names, so it's good if
 421             // they're valid identifiers.
 422             let name = name.chars().enumerate().map(|(i, c)| {
 423                     if (i == 0 && c.is_xid_start()) ||
 424                         (i != 0 && c.is_xid_continue()) {
 425                         c
 426                     } else {
 427                         '_'
 428                     }
 429                 }).collect::<String>();
 430
 431             // new header => reset count.
 432             self.cnt = 0;
 433             self.current_header = Some(name);
 434         }
 435     }
 436 }
 437
 438 impl DocFolder for Collector {
 439     fn fold_item(&mut self, item: clean::Item) -> Option<clean::Item> {
 440         let current_name = match item.name {
 441             Some(ref name) if !name.is_empty() => Some(name.clone()),
 442             _ => typename_if_impl(&item)
 443         };
 444
 445         let pushed = if let Some(name) = current_name {
 446             self.names.push(name);
 447             true
 448         } else {
 449             false
 450         };
 451
 452         if let Some(doc) = item.doc_value() {
 453             self.cnt = 0;
 454             markdown::find_testable_code(doc, &mut *self);
 455         }
 456
 457         let ret = self.fold_item_recur(item);
 458         if pushed {
 459             self.names.pop();
 460         }
 461
 462         return ret;
 463
 464         // FIXME: it would be better to not have the escaped version in the first place
 465         fn unescape_for_testname(mut s: String) -> String {
 466             // for refs `&foo`
 467             if s.contains("&amp;") {
 468                 s = s.replace("&amp;", "&");
 469
 470                 // `::&'a mut Foo::` looks weird, let's make it `::<&'a mut Foo>`::
 471                 if let Some('&') = s.chars().nth(0) {
 472                     s = format!("<{}>", s);
 473                 }
 474             }
 475
 476             // either `<..>` or `->`
 477             if s.contains("&gt;") {
 478                 s.replace("&gt;", ">")
 479                  .replace("&lt;", "<")
 480             } else {
 481                 s
 482             }
 483         }
 484
 485         fn typename_if_impl(item: &clean::Item) -> Option<String> {
 486             if let clean::ItemEnum::ImplItem(ref impl_) = item.inner {
 487                 let path = impl_.for_.to_string();
 488                 let unescaped_path = unescape_for_testname(path);
 489                 Some(unescaped_path)
 490             } else {
 491                 None
 492             }
 493         }
 494     }
 495 }