src/librustc/session/mod.rs

   1 // Copyright 2012-2013 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 use lint;
  12 use middle::cstore::CrateStore;
  13 use middle::dependency_format;
  14 use session::search_paths::PathKind;
  15 use util::nodemap::{NodeMap, FnvHashMap};
  16
  17 use syntax::ast::{NodeId, NodeIdAssigner, Name};
  18 use syntax::codemap::Span;
  19 use syntax::errors::{self, DiagnosticBuilder};
  20 use syntax::errors::emitter::{Emitter, BasicEmitter, EmitterWriter};
  21 use syntax::errors::json::JsonEmitter;
  22 use syntax::diagnostics;
  23 use syntax::feature_gate;
  24 use syntax::parse;
  25 use syntax::parse::ParseSess;
  26 use syntax::{ast, codemap};
  27 use syntax::feature_gate::AttributeType;
  28
  29 use rustc_back::target::Target;
  30
  31 use std::path::{Path, PathBuf};
  32 use std::cell::{Cell, RefCell};
  33 use std::collections::HashSet;
  34 use std::env;
  35 use std::rc::Rc;
  36
  37 pub mod config;
  38 pub mod filesearch;
  39 pub mod search_paths;
  40
  41 // Represents the data associated with a compilation
  42 // session for a single crate.
  43 pub struct Session {
  44     pub target: config::Config,
  45     pub host: Target,
  46     pub opts: config::Options,
  47     pub cstore: Rc<for<'a> CrateStore<'a>>,
  48     pub parse_sess: ParseSess,
  49     // For a library crate, this is always none
  50     pub entry_fn: RefCell<Option<(NodeId, codemap::Span)>>,
  51     pub entry_type: Cell<Option<config::EntryFnType>>,
  52     pub plugin_registrar_fn: Cell<Option<ast::NodeId>>,
  53     pub default_sysroot: Option<PathBuf>,
  54     // The name of the root source file of the crate, in the local file system.
  55     // The path is always expected to be absolute. `None` means that there is no
  56     // source file.
  57     pub local_crate_source_file: Option<PathBuf>,
  58     pub working_dir: PathBuf,
  59     pub lint_store: RefCell<lint::LintStore>,
  60     pub lints: RefCell<NodeMap<Vec<(lint::LintId, codemap::Span, String)>>>,
  61     pub plugin_llvm_passes: RefCell<Vec<String>>,
  62     pub plugin_attributes: RefCell<Vec<(String, AttributeType)>>,
  63     pub crate_types: RefCell<Vec<config::CrateType>>,
  64     pub dependency_formats: RefCell<dependency_format::Dependencies>,
  65     pub crate_metadata: RefCell<Vec<String>>,
  66     pub features: RefCell<feature_gate::Features>,
  67
  68     /// The maximum recursion limit for potentially infinitely recursive
  69     /// operations such as auto-dereference and monomorphization.
  70     pub recursion_limit: Cell<usize>,
  71
  72     /// The metadata::creader module may inject an allocator dependency if it
  73     /// didn't already find one, and this tracks what was injected.
  74     pub injected_allocator: Cell<Option<ast::CrateNum>>,
  75
  76     /// Names of all bang-style macros and syntax extensions
  77     /// available in this crate
  78     pub available_macros: RefCell<HashSet<Name>>,
  79
  80     next_node_id: Cell<ast::NodeId>,
  81 }
  82
  83 impl Session {
  84     pub fn struct_span_warn<'a>(&'a self,
  85                                 sp: Span,
  86                                 msg: &str)
  87                                 -> DiagnosticBuilder<'a>  {
  88         self.diagnostic().struct_span_warn(sp, msg)
  89     }
  90     pub fn struct_span_warn_with_code<'a>(&'a self,
  91                                           sp: Span,
  92                                           msg: &str,
  93                                           code: &str)
  94                                           -> DiagnosticBuilder<'a>  {
  95         self.diagnostic().struct_span_warn_with_code(sp, msg, code)
  96     }
  97     pub fn struct_warn<'a>(&'a self, msg: &str) -> DiagnosticBuilder<'a>  {
  98         self.diagnostic().struct_warn(msg)
  99     }
 100     pub fn struct_span_err<'a>(&'a self,
 101                                sp: Span,
 102                                msg: &str)
 103                                -> DiagnosticBuilder<'a>  {
 104         match split_msg_into_multilines(msg) {
 105             Some(ref msg) => self.diagnostic().struct_span_err(sp, msg),
 106             None => self.diagnostic().struct_span_err(sp, msg),
 107         }
 108     }
 109     pub fn struct_span_err_with_code<'a>(&'a self,
 110                                          sp: Span,
 111                                          msg: &str,
 112                                          code: &str)
 113                                          -> DiagnosticBuilder<'a>  {
 114         match split_msg_into_multilines(msg) {
 115             Some(ref msg) => self.diagnostic().struct_span_err_with_code(sp, msg, code),
 116             None => self.diagnostic().struct_span_err_with_code(sp, msg, code),
 117         }
 118     }
 119     pub fn struct_err<'a>(&'a self, msg: &str) -> DiagnosticBuilder<'a>  {
 120         self.diagnostic().struct_err(msg)
 121     }
 122     pub fn struct_span_fatal<'a>(&'a self,
 123                                  sp: Span,
 124                                  msg: &str)
 125                                  -> DiagnosticBuilder<'a>  {
 126         self.diagnostic().struct_span_fatal(sp, msg)
 127     }
 128     pub fn struct_span_fatal_with_code<'a>(&'a self,
 129                                            sp: Span,
 130                                            msg: &str,
 131                                            code: &str)
 132                                            -> DiagnosticBuilder<'a>  {
 133         self.diagnostic().struct_span_fatal_with_code(sp, msg, code)
 134     }
 135     pub fn struct_fatal<'a>(&'a self, msg: &str) -> DiagnosticBuilder<'a>  {
 136         self.diagnostic().struct_fatal(msg)
 137     }
 138
 139     pub fn span_fatal(&self, sp: Span, msg: &str) -> ! {
 140         panic!(self.diagnostic().span_fatal(sp, msg))
 141     }
 142     pub fn span_fatal_with_code(&self, sp: Span, msg: &str, code: &str) -> ! {
 143         panic!(self.diagnostic().span_fatal_with_code(sp, msg, code))
 144     }
 145     pub fn fatal(&self, msg: &str) -> ! {
 146         panic!(self.diagnostic().fatal(msg))
 147     }
 148     pub fn span_err_or_warn(&self, is_warning: bool, sp: Span, msg: &str) {
 149         if is_warning {
 150             self.span_warn(sp, msg);
 151         } else {
 152             self.span_err(sp, msg);
 153         }
 154     }
 155     pub fn span_err(&self, sp: Span, msg: &str) {
 156         match split_msg_into_multilines(msg) {
 157             Some(msg) => self.diagnostic().span_err(sp, &msg),
 158             None => self.diagnostic().span_err(sp, msg)
 159         }
 160     }
 161     pub fn span_err_with_code(&self, sp: Span, msg: &str, code: &str) {
 162         match split_msg_into_multilines(msg) {
 163             Some(msg) => self.diagnostic().span_err_with_code(sp, &msg, code),
 164             None => self.diagnostic().span_err_with_code(sp, msg, code)
 165         }
 166     }
 167     pub fn err(&self, msg: &str) {
 168         self.diagnostic().err(msg)
 169     }
 170     pub fn err_count(&self) -> usize {
 171         self.diagnostic().err_count()
 172     }
 173     pub fn has_errors(&self) -> bool {
 174         self.diagnostic().has_errors()
 175     }
 176     pub fn abort_if_errors(&self) {
 177         self.diagnostic().abort_if_errors();
 178     }
 179     pub fn abort_if_new_errors<F>(&self, mut f: F)
 180         where F: FnMut()
 181     {
 182         let count = self.err_count();
 183         f();
 184         if self.err_count() > count {
 185             self.abort_if_errors();
 186         }
 187     }
 188     pub fn span_warn(&self, sp: Span, msg: &str) {
 189         self.diagnostic().span_warn(sp, msg)
 190     }
 191     pub fn span_warn_with_code(&self, sp: Span, msg: &str, code: &str) {
 192         self.diagnostic().span_warn_with_code(sp, msg, code)
 193     }
 194     pub fn warn(&self, msg: &str) {
 195         self.diagnostic().warn(msg)
 196     }
 197     pub fn opt_span_warn(&self, opt_sp: Option<Span>, msg: &str) {
 198         match opt_sp {
 199             Some(sp) => self.span_warn(sp, msg),
 200             None => self.warn(msg),
 201         }
 202     }
 203     pub fn opt_span_bug(&self, opt_sp: Option<Span>, msg: &str) -> ! {
 204         match opt_sp {
 205             Some(sp) => self.span_bug(sp, msg),
 206             None => self.bug(msg),
 207         }
 208     }
 209     /// Delay a span_bug() call until abort_if_errors()
 210     pub fn delay_span_bug(&self, sp: Span, msg: &str) {
 211         self.diagnostic().delay_span_bug(sp, msg)
 212     }
 213     pub fn span_bug(&self, sp: Span, msg: &str) -> ! {
 214         self.diagnostic().span_bug(sp, msg)
 215     }
 216     pub fn bug(&self, msg: &str) -> ! {
 217         self.diagnostic().bug(msg)
 218     }
 219     pub fn note_without_error(&self, msg: &str) {
 220         self.diagnostic().note_without_error(msg)
 221     }
 222     pub fn span_note_without_error(&self, sp: Span, msg: &str) {
 223         self.diagnostic().span_note_without_error(sp, msg)
 224     }
 225     pub fn span_unimpl(&self, sp: Span, msg: &str) -> ! {
 226         self.diagnostic().span_unimpl(sp, msg)
 227     }
 228     pub fn unimpl(&self, msg: &str) -> ! {
 229         self.diagnostic().unimpl(msg)
 230     }
 231     pub fn add_lint(&self,
 232                     lint: &'static lint::Lint,
 233                     id: ast::NodeId,
 234                     sp: Span,
 235                     msg: String) {
 236         let lint_id = lint::LintId::of(lint);
 237         let mut lints = self.lints.borrow_mut();
 238         match lints.get_mut(&id) {
 239             Some(arr) => { arr.push((lint_id, sp, msg)); return; }
 240             None => {}
 241         }
 242         lints.insert(id, vec!((lint_id, sp, msg)));
 243     }
 244     pub fn reserve_node_ids(&self, count: ast::NodeId) -> ast::NodeId {
 245         let id = self.next_node_id.get();
 246
 247         match id.checked_add(count) {
 248             Some(next) => self.next_node_id.set(next),
 249             None => self.bug("Input too large, ran out of node ids!")
 250         }
 251
 252         id
 253     }
 254     pub fn diagnostic<'a>(&'a self) -> &'a errors::Handler {
 255         &self.parse_sess.span_diagnostic
 256     }
 257     pub fn codemap<'a>(&'a self) -> &'a codemap::CodeMap {
 258         self.parse_sess.codemap()
 259     }
 260     // This exists to help with refactoring to eliminate impossible
 261     // cases later on
 262     pub fn impossible_case(&self, sp: Span, msg: &str) -> ! {
 263         self.span_bug(sp, &format!("impossible case reached: {}", msg));
 264     }
 265     pub fn verbose(&self) -> bool { self.opts.debugging_opts.verbose }
 266     pub fn time_passes(&self) -> bool { self.opts.debugging_opts.time_passes }
 267     pub fn count_llvm_insns(&self) -> bool {
 268         self.opts.debugging_opts.count_llvm_insns
 269     }
 270     pub fn count_type_sizes(&self) -> bool {
 271         self.opts.debugging_opts.count_type_sizes
 272     }
 273     pub fn time_llvm_passes(&self) -> bool {
 274         self.opts.debugging_opts.time_llvm_passes
 275     }
 276     pub fn trans_stats(&self) -> bool { self.opts.debugging_opts.trans_stats }
 277     pub fn meta_stats(&self) -> bool { self.opts.debugging_opts.meta_stats }
 278     pub fn asm_comments(&self) -> bool { self.opts.debugging_opts.asm_comments }
 279     pub fn no_verify(&self) -> bool { self.opts.debugging_opts.no_verify }
 280     pub fn borrowck_stats(&self) -> bool { self.opts.debugging_opts.borrowck_stats }
 281     pub fn print_llvm_passes(&self) -> bool {
 282         self.opts.debugging_opts.print_llvm_passes
 283     }
 284     pub fn lto(&self) -> bool {
 285         self.opts.cg.lto
 286     }
 287     pub fn no_landing_pads(&self) -> bool {
 288         self.opts.debugging_opts.no_landing_pads
 289     }
 290     pub fn unstable_options(&self) -> bool {
 291         self.opts.debugging_opts.unstable_options
 292     }
 293     pub fn print_enum_sizes(&self) -> bool {
 294         self.opts.debugging_opts.print_enum_sizes
 295     }
 296     pub fn nonzeroing_move_hints(&self) -> bool {
 297         self.opts.debugging_opts.enable_nonzeroing_move_hints
 298     }
 299     pub fn sysroot<'a>(&'a self) -> &'a Path {
 300         match self.opts.maybe_sysroot {
 301             Some (ref sysroot) => sysroot,
 302             None => self.default_sysroot.as_ref()
 303                         .expect("missing sysroot and default_sysroot in Session")
 304         }
 305     }
 306     pub fn target_filesearch(&self, kind: PathKind) -> filesearch::FileSearch {
 307         filesearch::FileSearch::new(self.sysroot(),
 308                                     &self.opts.target_triple,
 309                                     &self.opts.search_paths,
 310                                     kind)
 311     }
 312     pub fn host_filesearch(&self, kind: PathKind) -> filesearch::FileSearch {
 313         filesearch::FileSearch::new(
 314             self.sysroot(),
 315             config::host_triple(),
 316             &self.opts.search_paths,
 317             kind)
 318     }
 319 }
 320
 321 impl NodeIdAssigner for Session {
 322     fn next_node_id(&self) -> NodeId {
 323         self.reserve_node_ids(1)
 324     }
 325
 326     fn peek_node_id(&self) -> NodeId {
 327         self.next_node_id.get().checked_add(1).unwrap()
 328     }
 329 }
 330
 331 fn split_msg_into_multilines(msg: &str) -> Option<String> {
 332     // Conditions for enabling multi-line errors:
 333     if !msg.contains("mismatched types") &&
 334         !msg.contains("type mismatch resolving") &&
 335         !msg.contains("if and else have incompatible types") &&
 336         !msg.contains("if may be missing an else clause") &&
 337         !msg.contains("match arms have incompatible types") &&
 338         !msg.contains("structure constructor specifies a structure of type") &&
 339         !msg.contains("has an incompatible type for trait") {
 340             return None
 341     }
 342     let first = msg.match_indices("expected").filter(|s| {
 343         s.0 > 0 && (msg.char_at_reverse(s.0) == ' ' ||
 344                     msg.char_at_reverse(s.0) == '(')
 345     }).map(|(a, b)| (a - 1, a + b.len()));
 346     let second = msg.match_indices("found").filter(|s| {
 347         msg.char_at_reverse(s.0) == ' '
 348     }).map(|(a, b)| (a - 1, a + b.len()));
 349
 350     let mut new_msg = String::new();
 351     let mut head = 0;
 352
 353     // Insert `\n` before expected and found.
 354     for (pos1, pos2) in first.zip(second) {
 355         new_msg = new_msg +
 356         // A `(` may be preceded by a space and it should be trimmed
 357                   msg[head..pos1.0].trim_right() + // prefix
 358                   "\n" +                           // insert before first
 359                   &msg[pos1.0..pos1.1] +           // insert what first matched
 360                   &msg[pos1.1..pos2.0] +           // between matches
 361                   "\n   " +                        // insert before second
 362         //           123
 363         // `expected` is 3 char longer than `found`. To align the types,
 364         // `found` gets 3 spaces prepended.
 365                   &msg[pos2.0..pos2.1];            // insert what second matched
 366
 367         head = pos2.1;
 368     }
 369
 370     let mut tail = &msg[head..];
 371     let third = tail.find("(values differ")
 372                    .or(tail.find("(lifetime"))
 373                    .or(tail.find("(cyclic type of infinite size"));
 374     // Insert `\n` before any remaining messages which match.
 375     if let Some(pos) = third {
 376         // The end of the message may just be wrapped in `()` without
 377         // `expected`/`found`.  Push this also to a new line and add the
 378         // final tail after.
 379         new_msg = new_msg +
 380         // `(` is usually preceded by a space and should be trimmed.
 381                   tail[..pos].trim_right() + // prefix
 382                   "\n" +                     // insert before paren
 383                   &tail[pos..];              // append the tail
 384
 385         tail = "";
 386     }
 387
 388     new_msg.push_str(tail);
 389     return Some(new_msg);
 390 }
 391
 392 pub fn build_session(sopts: config::Options,
 393                      local_crate_source_file: Option<PathBuf>,
 394                      registry: diagnostics::registry::Registry,
 395                      cstore: Rc<for<'a> CrateStore<'a>>)
 396                      -> Session {
 397     // FIXME: This is not general enough to make the warning lint completely override
 398     // normal diagnostic warnings, since the warning lint can also be denied and changed
 399     // later via the source code.
 400     let can_print_warnings = sopts.lint_opts
 401         .iter()
 402         .filter(|&&(ref key, _)| *key == "warnings")
 403         .map(|&(_, ref level)| *level != lint::Allow)
 404         .last()
 405         .unwrap_or(true);
 406     let treat_err_as_bug = sopts.treat_err_as_bug;
 407
 408     let codemap = Rc::new(codemap::CodeMap::new());
 409     let emitter: Box<Emitter> = match sopts.error_format {
 410         config::ErrorOutputType::HumanReadable(color_config) => {
 411             Box::new(EmitterWriter::stderr(color_config, Some(registry), codemap.clone()))
 412         }
 413         config::ErrorOutputType::Json => {
 414             Box::new(JsonEmitter::stderr(Some(registry), codemap.clone()))
 415         }
 416     };
 417
 418     let diagnostic_handler =
 419         errors::Handler::with_emitter(can_print_warnings,
 420                                       treat_err_as_bug,
 421                                       emitter);
 422
 423     build_session_(sopts, local_crate_source_file, diagnostic_handler, codemap, cstore)
 424 }
 425
 426 pub fn build_session_(sopts: config::Options,
 427                       local_crate_source_file: Option<PathBuf>,
 428                       span_diagnostic: errors::Handler,
 429                       codemap: Rc<codemap::CodeMap>,
 430                       cstore: Rc<for<'a> CrateStore<'a>>)
 431                       -> Session {
 432     let host = match Target::search(config::host_triple()) {
 433         Ok(t) => t,
 434         Err(e) => {
 435             panic!(span_diagnostic.fatal(&format!("Error loading host specification: {}", e)));
 436     }
 437     };
 438     let target_cfg = config::build_target_config(&sopts, &span_diagnostic);
 439     let p_s = parse::ParseSess::with_span_handler(span_diagnostic, codemap);
 440     let default_sysroot = match sopts.maybe_sysroot {
 441         Some(_) => None,
 442         None => Some(filesearch::get_or_default_sysroot())
 443     };
 444
 445     // Make the path absolute, if necessary
 446     let local_crate_source_file = local_crate_source_file.map(|path|
 447         if path.is_absolute() {
 448             path.clone()
 449         } else {
 450             env::current_dir().unwrap().join(&path)
 451         }
 452     );
 453
 454     let sess = Session {
 455         target: target_cfg,
 456         host: host,
 457         opts: sopts,
 458         cstore: cstore,
 459         parse_sess: p_s,
 460         // For a library crate, this is always none
 461         entry_fn: RefCell::new(None),
 462         entry_type: Cell::new(None),
 463         plugin_registrar_fn: Cell::new(None),
 464         default_sysroot: default_sysroot,
 465         local_crate_source_file: local_crate_source_file,
 466         working_dir: env::current_dir().unwrap(),
 467         lint_store: RefCell::new(lint::LintStore::new()),
 468         lints: RefCell::new(NodeMap()),
 469         plugin_llvm_passes: RefCell::new(Vec::new()),
 470         plugin_attributes: RefCell::new(Vec::new()),
 471         crate_types: RefCell::new(Vec::new()),
 472         dependency_formats: RefCell::new(FnvHashMap()),
 473         crate_metadata: RefCell::new(Vec::new()),
 474         features: RefCell::new(feature_gate::Features::new()),
 475         recursion_limit: Cell::new(64),
 476         next_node_id: Cell::new(1),
 477         injected_allocator: Cell::new(None),
 478         available_macros: RefCell::new(HashSet::new()),
 479     };
 480
 481     sess
 482 }
 483
 484 pub fn early_error(output: config::ErrorOutputType, msg: &str) -> ! {
 485     let mut emitter: Box<Emitter> = match output {
 486         config::ErrorOutputType::HumanReadable(color_config) => {
 487             Box::new(BasicEmitter::stderr(color_config))
 488         }
 489         config::ErrorOutputType::Json => Box::new(JsonEmitter::basic()),
 490     };
 491     emitter.emit(None, msg, None, errors::Level::Fatal);
 492     panic!(errors::FatalError);
 493 }
 494
 495 pub fn early_warn(output: config::ErrorOutputType, msg: &str) {
 496     let mut emitter: Box<Emitter> = match output {
 497         config::ErrorOutputType::HumanReadable(color_config) => {
 498             Box::new(BasicEmitter::stderr(color_config))
 499         }
 500         config::ErrorOutputType::Json => Box::new(JsonEmitter::basic()),
 501     };
 502     emitter.emit(None, msg, None, errors::Level::Warning);
 503 }