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
  12 use lint;
  13 use metadata::cstore::CStore;
  14 use metadata::filesearch;
  15 use session::search_paths::PathKind;
  16 use util::nodemap::NodeMap;
  17
  18 use syntax::ast::NodeId;
  19 use syntax::codemap::Span;
  20 use syntax::diagnostic::{self, Emitter};
  21 use syntax::diagnostics;
  22 use syntax::feature_gate;
  23 use syntax::parse;
  24 use syntax::parse::token;
  25 use syntax::parse::ParseSess;
  26 use syntax::{ast, codemap};
  27
  28 use rustc_back::target::Target;
  29
  30 use std::env;
  31 use std::cell::{Cell, RefCell};
  32
  33 pub mod config;
  34 pub mod search_paths;
  35
  36 // Represents the data associated with a compilation
  37 // session for a single crate.
  38 pub struct Session {
  39     pub target: config::Config,
  40     pub host: Target,
  41     pub opts: config::Options,
  42     pub cstore: CStore,
  43     pub parse_sess: ParseSess,
  44     // For a library crate, this is always none
  45     pub entry_fn: RefCell<Option<(NodeId, codemap::Span)>>,
  46     pub entry_type: Cell<Option<config::EntryFnType>>,
  47     pub plugin_registrar_fn: Cell<Option<ast::NodeId>>,
  48     pub default_sysroot: Option<Path>,
  49     // The name of the root source file of the crate, in the local file system. The path is always
  50     // expected to be absolute. `None` means that there is no source file.
  51     pub local_crate_source_file: Option<Path>,
  52     pub working_dir: Path,
  53     pub lint_store: RefCell<lint::LintStore>,
  54     pub lints: RefCell<NodeMap<Vec<(lint::LintId, codemap::Span, String)>>>,
  55     pub crate_types: RefCell<Vec<config::CrateType>>,
  56     pub crate_metadata: RefCell<Vec<String>>,
  57     pub features: RefCell<feature_gate::Features>,
  58
  59     /// The maximum recursion limit for potentially infinitely recursive
  60     /// operations such as auto-dereference and monomorphization.
  61     pub recursion_limit: Cell<uint>,
  62
  63     pub can_print_warnings: bool
  64 }
  65
  66 impl Session {
  67     pub fn span_fatal(&self, sp: Span, msg: &str) -> ! {
  68         self.diagnostic().span_fatal(sp, msg)
  69     }
  70     pub fn span_fatal_with_code(&self, sp: Span, msg: &str, code: &str) -> ! {
  71         self.diagnostic().span_fatal_with_code(sp, msg, code)
  72     }
  73     pub fn fatal(&self, msg: &str) -> ! {
  74         self.diagnostic().handler().fatal(msg)
  75     }
  76     pub fn span_err(&self, sp: Span, msg: &str) {
  77         match split_msg_into_multilines(msg) {
  78             Some(msg) => self.diagnostic().span_err(sp, &msg[..]),
  79             None => self.diagnostic().span_err(sp, msg)
  80         }
  81     }
  82     pub fn span_err_with_code(&self, sp: Span, msg: &str, code: &str) {
  83         match split_msg_into_multilines(msg) {
  84             Some(msg) => self.diagnostic().span_err_with_code(sp, &msg[..], code),
  85             None => self.diagnostic().span_err_with_code(sp, msg, code)
  86         }
  87     }
  88     pub fn err(&self, msg: &str) {
  89         self.diagnostic().handler().err(msg)
  90     }
  91     pub fn err_count(&self) -> uint {
  92         self.diagnostic().handler().err_count()
  93     }
  94     pub fn has_errors(&self) -> bool {
  95         self.diagnostic().handler().has_errors()
  96     }
  97     pub fn abort_if_errors(&self) {
  98         self.diagnostic().handler().abort_if_errors()
  99     }
 100     pub fn span_warn(&self, sp: Span, msg: &str) {
 101         if self.can_print_warnings {
 102             self.diagnostic().span_warn(sp, msg)
 103         }
 104     }
 105     pub fn span_warn_with_code(&self, sp: Span, msg: &str, code: &str) {
 106         if self.can_print_warnings {
 107             self.diagnostic().span_warn_with_code(sp, msg, code)
 108         }
 109     }
 110     pub fn warn(&self, msg: &str) {
 111         if self.can_print_warnings {
 112             self.diagnostic().handler().warn(msg)
 113         }
 114     }
 115     pub fn opt_span_warn(&self, opt_sp: Option<Span>, msg: &str) {
 116         match opt_sp {
 117             Some(sp) => self.span_warn(sp, msg),
 118             None => self.warn(msg),
 119         }
 120     }
 121     pub fn span_note(&self, sp: Span, msg: &str) {
 122         self.diagnostic().span_note(sp, msg)
 123     }
 124     pub fn span_end_note(&self, sp: Span, msg: &str) {
 125         self.diagnostic().span_end_note(sp, msg)
 126     }
 127     pub fn span_help(&self, sp: Span, msg: &str) {
 128         self.diagnostic().span_help(sp, msg)
 129     }
 130     pub fn fileline_note(&self, sp: Span, msg: &str) {
 131         self.diagnostic().fileline_note(sp, msg)
 132     }
 133     pub fn fileline_help(&self, sp: Span, msg: &str) {
 134         self.diagnostic().fileline_help(sp, msg)
 135     }
 136     pub fn note(&self, msg: &str) {
 137         self.diagnostic().handler().note(msg)
 138     }
 139     pub fn help(&self, msg: &str) {
 140         self.diagnostic().handler().note(msg)
 141     }
 142     pub fn opt_span_bug(&self, opt_sp: Option<Span>, msg: &str) -> ! {
 143         match opt_sp {
 144             Some(sp) => self.span_bug(sp, msg),
 145             None => self.bug(msg),
 146         }
 147     }
 148     pub fn span_bug(&self, sp: Span, msg: &str) -> ! {
 149         self.diagnostic().span_bug(sp, msg)
 150     }
 151     pub fn bug(&self, msg: &str) -> ! {
 152         self.diagnostic().handler().bug(msg)
 153     }
 154     pub fn span_unimpl(&self, sp: Span, msg: &str) -> ! {
 155         self.diagnostic().span_unimpl(sp, msg)
 156     }
 157     pub fn unimpl(&self, msg: &str) -> ! {
 158         self.diagnostic().handler().unimpl(msg)
 159     }
 160     pub fn add_lint(&self,
 161                     lint: &'static lint::Lint,
 162                     id: ast::NodeId,
 163                     sp: Span,
 164                     msg: String) {
 165         let lint_id = lint::LintId::of(lint);
 166         let mut lints = self.lints.borrow_mut();
 167         match lints.get_mut(&id) {
 168             Some(arr) => { arr.push((lint_id, sp, msg)); return; }
 169             None => {}
 170         }
 171         lints.insert(id, vec!((lint_id, sp, msg)));
 172     }
 173     pub fn next_node_id(&self) -> ast::NodeId {
 174         self.parse_sess.next_node_id()
 175     }
 176     pub fn reserve_node_ids(&self, count: ast::NodeId) -> ast::NodeId {
 177         self.parse_sess.reserve_node_ids(count)
 178     }
 179     pub fn diagnostic<'a>(&'a self) -> &'a diagnostic::SpanHandler {
 180         &self.parse_sess.span_diagnostic
 181     }
 182     pub fn codemap<'a>(&'a self) -> &'a codemap::CodeMap {
 183         &self.parse_sess.span_diagnostic.cm
 184     }
 185     // This exists to help with refactoring to eliminate impossible
 186     // cases later on
 187     pub fn impossible_case(&self, sp: Span, msg: &str) -> ! {
 188         self.span_bug(sp,
 189                       &format!("impossible case reached: {}", msg)[]);
 190     }
 191     pub fn verbose(&self) -> bool { self.opts.debugging_opts.verbose }
 192     pub fn time_passes(&self) -> bool { self.opts.debugging_opts.time_passes }
 193     pub fn count_llvm_insns(&self) -> bool {
 194         self.opts.debugging_opts.count_llvm_insns
 195     }
 196     pub fn count_type_sizes(&self) -> bool {
 197         self.opts.debugging_opts.count_type_sizes
 198     }
 199     pub fn time_llvm_passes(&self) -> bool {
 200         self.opts.debugging_opts.time_llvm_passes
 201     }
 202     pub fn trans_stats(&self) -> bool { self.opts.debugging_opts.trans_stats }
 203     pub fn meta_stats(&self) -> bool { self.opts.debugging_opts.meta_stats }
 204     pub fn asm_comments(&self) -> bool { self.opts.debugging_opts.asm_comments }
 205     pub fn no_verify(&self) -> bool { self.opts.debugging_opts.no_verify }
 206     pub fn borrowck_stats(&self) -> bool { self.opts.debugging_opts.borrowck_stats }
 207     pub fn print_llvm_passes(&self) -> bool {
 208         self.opts.debugging_opts.print_llvm_passes
 209     }
 210     pub fn lto(&self) -> bool {
 211         self.opts.cg.lto
 212     }
 213     pub fn no_landing_pads(&self) -> bool {
 214         self.opts.debugging_opts.no_landing_pads
 215     }
 216     pub fn unstable_options(&self) -> bool {
 217         self.opts.debugging_opts.unstable_options
 218     }
 219     pub fn print_enum_sizes(&self) -> bool {
 220         self.opts.debugging_opts.print_enum_sizes
 221     }
 222     pub fn sysroot<'a>(&'a self) -> &'a Path {
 223         match self.opts.maybe_sysroot {
 224             Some (ref sysroot) => sysroot,
 225             None => self.default_sysroot.as_ref()
 226                         .expect("missing sysroot and default_sysroot in Session")
 227         }
 228     }
 229     pub fn target_filesearch(&self, kind: PathKind) -> filesearch::FileSearch {
 230         filesearch::FileSearch::new(self.sysroot(),
 231                                     &self.opts.target_triple[],
 232                                     &self.opts.search_paths,
 233                                     kind)
 234     }
 235     pub fn host_filesearch(&self, kind: PathKind) -> filesearch::FileSearch {
 236         filesearch::FileSearch::new(
 237             self.sysroot(),
 238             config::host_triple(),
 239             &self.opts.search_paths,
 240             kind)
 241     }
 242 }
 243
 244 fn split_msg_into_multilines(msg: &str) -> Option<String> {
 245     // Conditions for enabling multi-line errors:
 246     if !msg.contains("mismatched types") &&
 247         !msg.contains("type mismatch resolving") &&
 248         !msg.contains("if and else have incompatible types") &&
 249         !msg.contains("if may be missing an else clause") &&
 250         !msg.contains("match arms have incompatible types") &&
 251         !msg.contains("structure constructor specifies a structure of type") {
 252             return None
 253     }
 254     let first = msg.match_indices("expected").filter(|s| {
 255         s.0 > 0 && (msg.char_at_reverse(s.0) == ' ' ||
 256                     msg.char_at_reverse(s.0) == '(')
 257     }).map(|(a, b)| (a - 1, b));
 258     let second = msg.match_indices("found").filter(|s| {
 259         msg.char_at_reverse(s.0) == ' '
 260     }).map(|(a, b)| (a - 1, b));
 261
 262     let mut new_msg = String::new();
 263     let mut head = 0;
 264
 265     // Insert `\n` before expected and found.
 266     for (pos1, pos2) in first.zip(second) {
 267         new_msg = new_msg +
 268         // A `(` may be preceded by a space and it should be trimmed
 269                   msg[head..pos1.0].trim_right() + // prefix
 270                   "\n" +                           // insert before first
 271                   &msg[pos1.0..pos1.1] +           // insert what first matched
 272                   &msg[pos1.1..pos2.0] +           // between matches
 273                   "\n   " +                        // insert before second
 274         //           123
 275         // `expected` is 3 char longer than `found`. To align the types,
 276         // `found` gets 3 spaces prepended.
 277                   &msg[pos2.0..pos2.1];            // insert what second matched
 278
 279         head = pos2.1;
 280     }
 281
 282     let mut tail = &msg[head..];
 283     let third = tail.find_str("(values differ")
 284                    .or(tail.find_str("(lifetime"))
 285                    .or(tail.find_str("(cyclic type of infinite size"));
 286     // Insert `\n` before any remaining messages which match.
 287     if let Some(pos) = third {
 288         // The end of the message may just be wrapped in `()` without
 289         // `expected`/`found`.  Push this also to a new line and add the
 290         // final tail after.
 291         new_msg = new_msg +
 292         // `(` is usually preceded by a space and should be trimmed.
 293                   tail[..pos].trim_right() + // prefix
 294                   "\n" +                     // insert before paren
 295                   &tail[pos..];              // append the tail
 296
 297         tail = "";
 298     }
 299
 300     new_msg.push_str(tail);
 301     return Some(new_msg);
 302 }
 303
 304 pub fn build_session(sopts: config::Options,
 305                      local_crate_source_file: Option<Path>,
 306                      registry: diagnostics::registry::Registry)
 307                      -> Session {
 308     // FIXME: This is not general enough to make the warning lint completely override
 309     // normal diagnostic warnings, since the warning lint can also be denied and changed
 310     // later via the source code.
 311     let can_print_warnings = sopts.lint_opts
 312         .iter()
 313         .filter(|&&(ref key, _)| *key == "warnings")
 314         .map(|&(_, ref level)| *level != lint::Allow)
 315         .last()
 316         .unwrap_or(true);
 317
 318     let codemap = codemap::CodeMap::new();
 319     let diagnostic_handler =
 320         diagnostic::default_handler(sopts.color, Some(registry), can_print_warnings);
 321     let span_diagnostic_handler =
 322         diagnostic::mk_span_handler(diagnostic_handler, codemap);
 323
 324     build_session_(sopts, local_crate_source_file, span_diagnostic_handler)
 325 }
 326
 327 pub fn build_session_(sopts: config::Options,
 328                       local_crate_source_file: Option<Path>,
 329                       span_diagnostic: diagnostic::SpanHandler)
 330                       -> Session {
 331     let host = match Target::search(config::host_triple()) {
 332         Ok(t) => t,
 333         Err(e) => {
 334             span_diagnostic.handler()
 335                 .fatal(&format!("Error loading host specification: {}", e));
 336     }
 337     };
 338     let target_cfg = config::build_target_config(&sopts, &span_diagnostic);
 339     let p_s = parse::new_parse_sess_special_handler(span_diagnostic);
 340     let default_sysroot = match sopts.maybe_sysroot {
 341         Some(_) => None,
 342         None => Some(filesearch::get_or_default_sysroot())
 343     };
 344
 345     // Make the path absolute, if necessary
 346     let local_crate_source_file = local_crate_source_file.map(|path|
 347         if path.is_absolute() {
 348             path.clone()
 349         } else {
 350             env::current_dir().unwrap().join(&path)
 351         }
 352     );
 353
 354     let can_print_warnings = sopts.lint_opts
 355         .iter()
 356         .filter(|&&(ref key, _)| *key == "warnings")
 357         .map(|&(_, ref level)| *level != lint::Allow)
 358         .last()
 359         .unwrap_or(true);
 360
 361     let sess = Session {
 362         target: target_cfg,
 363         host: host,
 364         opts: sopts,
 365         cstore: CStore::new(token::get_ident_interner()),
 366         parse_sess: p_s,
 367         // For a library crate, this is always none
 368         entry_fn: RefCell::new(None),
 369         entry_type: Cell::new(None),
 370         plugin_registrar_fn: Cell::new(None),
 371         default_sysroot: default_sysroot,
 372         local_crate_source_file: local_crate_source_file,
 373         working_dir: env::current_dir().unwrap(),
 374         lint_store: RefCell::new(lint::LintStore::new()),
 375         lints: RefCell::new(NodeMap()),
 376         crate_types: RefCell::new(Vec::new()),
 377         crate_metadata: RefCell::new(Vec::new()),
 378         features: RefCell::new(feature_gate::Features::new()),
 379         recursion_limit: Cell::new(64),
 380         can_print_warnings: can_print_warnings
 381     };
 382
 383     sess.lint_store.borrow_mut().register_builtin(Some(&sess));
 384     sess
 385 }
 386
 387 // Seems out of place, but it uses session, so I'm putting it here
 388 pub fn expect<T, M>(sess: &Session, opt: Option<T>, msg: M) -> T where
 389     M: FnOnce() -> String,
 390 {
 391     diagnostic::expect(sess.diagnostic(), opt, msg)
 392 }
 393
 394 pub fn early_error(msg: &str) -> ! {
 395     let mut emitter = diagnostic::EmitterWriter::stderr(diagnostic::Auto, None);
 396     emitter.emit(None, msg, None, diagnostic::Fatal);
 397     panic!(diagnostic::FatalError);
 398 }
 399
 400 pub fn early_warn(msg: &str) {
 401     let mut emitter = diagnostic::EmitterWriter::stderr(diagnostic::Auto, None);
 402     emitter.emit(None, msg, None, diagnostic::Warning);
 403 }