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.
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.
12 use middle::cstore::CrateStore;
13 use middle::dependency_format;
14 use session::search_paths::PathKind;
15 use util::nodemap::{NodeMap, FnvHashMap};
17 use syntax::ast::{NodeId, NodeIdAssigner, Name};
18 use syntax::codemap::Span;
20 use syntax::errors::emitter::{Emitter, BasicEmitter};
21 use syntax::diagnostics;
22 use syntax::feature_gate;
24 use syntax::parse::ParseSess;
25 use syntax::{ast, codemap};
26 use syntax::feature_gate::AttributeType;
28 use rustc_back::target::Target;
30 use std::path::{Path, PathBuf};
31 use std::cell::{Cell, RefCell};
32 use std::collections::HashSet;
40 // Represents the data associated with a compilation
41 // session for a single crate.
43 pub target: config::Config,
45 pub opts: config::Options,
46 pub cstore: Rc<for<'a> CrateStore<'a>>,
47 pub parse_sess: ParseSess,
48 // For a library crate, this is always none
49 pub entry_fn: RefCell<Option<(NodeId, codemap::Span)>>,
50 pub entry_type: Cell<Option<config::EntryFnType>>,
51 pub plugin_registrar_fn: Cell<Option<ast::NodeId>>,
52 pub default_sysroot: Option<PathBuf>,
53 // The name of the root source file of the crate, in the local file system.
54 // The path is always expected to be absolute. `None` means that there is no
56 pub local_crate_source_file: Option<PathBuf>,
57 pub working_dir: PathBuf,
58 pub lint_store: RefCell<lint::LintStore>,
59 pub lints: RefCell<NodeMap<Vec<(lint::LintId, codemap::Span, String)>>>,
60 pub plugin_llvm_passes: RefCell<Vec<String>>,
61 pub plugin_attributes: RefCell<Vec<(String, AttributeType)>>,
62 pub crate_types: RefCell<Vec<config::CrateType>>,
63 pub dependency_formats: RefCell<dependency_format::Dependencies>,
64 pub crate_metadata: RefCell<Vec<String>>,
65 pub features: RefCell<feature_gate::Features>,
67 pub delayed_span_bug: RefCell<Option<(codemap::Span, String)>>,
69 /// The maximum recursion limit for potentially infinitely recursive
70 /// operations such as auto-dereference and monomorphization.
71 pub recursion_limit: Cell<usize>,
73 pub can_print_warnings: bool,
75 /// The metadata::creader module may inject an allocator dependency if it
76 /// didn't already find one, and this tracks what was injected.
77 pub injected_allocator: Cell<Option<ast::CrateNum>>,
79 /// Names of all bang-style macros and syntax extensions
80 /// available in this crate
81 pub available_macros: RefCell<HashSet<Name>>,
83 next_node_id: Cell<ast::NodeId>,
87 pub fn span_fatal(&self, sp: Span, msg: &str) -> ! {
88 if self.opts.treat_err_as_bug {
89 self.span_bug(sp, msg);
91 panic!(self.diagnostic().span_fatal(sp, msg))
93 pub fn span_fatal_with_code(&self, sp: Span, msg: &str, code: &str) -> ! {
94 if self.opts.treat_err_as_bug {
95 self.span_bug(sp, msg);
97 panic!(self.diagnostic().span_fatal_with_code(sp, msg, code))
99 pub fn fatal(&self, msg: &str) -> ! {
100 if self.opts.treat_err_as_bug {
103 panic!(self.diagnostic().fatal(msg))
105 pub fn span_err_or_warn(&self, is_warning: bool, sp: Span, msg: &str) {
107 self.span_warn(sp, msg);
109 self.span_err(sp, msg);
112 pub fn span_err(&self, sp: Span, msg: &str) {
113 if self.opts.treat_err_as_bug {
114 self.span_bug(sp, msg);
116 match split_msg_into_multilines(msg) {
117 Some(msg) => self.diagnostic().span_err(sp, &msg[..]),
118 None => self.diagnostic().span_err(sp, msg)
121 pub fn note_rfc_1214(&self, span: Span) {
124 &format!("this warning results from recent bug fixes and clarifications; \
125 it will become a HARD ERROR in the next release. \
126 See RFC 1214 for details."));
128 pub fn span_err_with_code(&self, sp: Span, msg: &str, code: &str) {
129 if self.opts.treat_err_as_bug {
130 self.span_bug(sp, msg);
132 match split_msg_into_multilines(msg) {
133 Some(msg) => self.diagnostic().span_err_with_code(sp, &msg[..], code),
134 None => self.diagnostic().span_err_with_code(sp, msg, code)
137 pub fn err(&self, msg: &str) {
138 if self.opts.treat_err_as_bug {
141 self.diagnostic().err(msg)
143 pub fn err_count(&self) -> usize {
144 self.diagnostic().err_count()
146 pub fn has_errors(&self) -> bool {
147 self.diagnostic().has_errors()
149 pub fn abort_if_errors(&self) {
150 self.diagnostic().abort_if_errors();
152 let delayed_bug = self.delayed_span_bug.borrow();
154 Some((span, ref errmsg)) => {
155 self.diagnostic().span_bug(span, errmsg);
160 pub fn abort_if_new_errors<F>(&self, mut f: F)
163 let count = self.err_count();
165 if self.err_count() > count {
166 self.abort_if_errors();
169 pub fn span_warn(&self, sp: Span, msg: &str) {
170 if self.can_print_warnings {
171 self.diagnostic().span_warn(sp, msg)
174 pub fn span_warn_with_code(&self, sp: Span, msg: &str, code: &str) {
175 if self.can_print_warnings {
176 self.diagnostic().span_warn_with_code(sp, msg, code)
179 pub fn warn(&self, msg: &str) {
180 if self.can_print_warnings {
181 self.diagnostic().warn(msg)
184 pub fn opt_span_warn(&self, opt_sp: Option<Span>, msg: &str) {
186 Some(sp) => self.span_warn(sp, msg),
187 None => self.warn(msg),
190 pub fn span_note(&self, sp: Span, msg: &str) {
191 self.diagnostic().span_note(sp, msg)
193 pub fn span_end_note(&self, sp: Span, msg: &str) {
194 self.diagnostic().span_end_note(sp, msg)
197 /// Prints out a message with a suggested edit of the code.
199 /// See `errors::RenderSpan::Suggestion` for more information.
200 pub fn span_suggestion(&self, sp: Span, msg: &str, suggestion: String) {
201 self.diagnostic().span_suggestion(sp, msg, suggestion)
203 pub fn span_help(&self, sp: Span, msg: &str) {
204 self.diagnostic().span_help(sp, msg)
206 pub fn fileline_note(&self, sp: Span, msg: &str) {
207 self.diagnostic().fileline_note(sp, msg)
209 pub fn fileline_help(&self, sp: Span, msg: &str) {
210 self.diagnostic().fileline_help(sp, msg)
212 pub fn note(&self, msg: &str) {
213 self.diagnostic().note(msg)
215 pub fn help(&self, msg: &str) {
216 self.diagnostic().help(msg)
218 pub fn opt_span_bug(&self, opt_sp: Option<Span>, msg: &str) -> ! {
220 Some(sp) => self.span_bug(sp, msg),
221 None => self.bug(msg),
224 /// Delay a span_bug() call until abort_if_errors()
225 pub fn delay_span_bug(&self, sp: Span, msg: &str) {
226 let mut delayed = self.delayed_span_bug.borrow_mut();
227 *delayed = Some((sp, msg.to_string()));
229 pub fn span_bug(&self, sp: Span, msg: &str) -> ! {
230 self.diagnostic().span_bug(sp, msg)
232 pub fn bug(&self, msg: &str) -> ! {
233 self.diagnostic().bug(msg)
235 pub fn span_unimpl(&self, sp: Span, msg: &str) -> ! {
236 self.diagnostic().span_unimpl(sp, msg)
238 pub fn unimpl(&self, msg: &str) -> ! {
239 self.diagnostic().unimpl(msg)
241 pub fn add_lint(&self,
242 lint: &'static lint::Lint,
246 let lint_id = lint::LintId::of(lint);
247 let mut lints = self.lints.borrow_mut();
248 match lints.get_mut(&id) {
249 Some(arr) => { arr.push((lint_id, sp, msg)); return; }
252 lints.insert(id, vec!((lint_id, sp, msg)));
254 pub fn reserve_node_ids(&self, count: ast::NodeId) -> ast::NodeId {
255 let id = self.next_node_id.get();
257 match id.checked_add(count) {
258 Some(next) => self.next_node_id.set(next),
259 None => self.bug("Input too large, ran out of node ids!")
264 pub fn diagnostic<'a>(&'a self) -> &'a errors::Handler {
265 &self.parse_sess.span_diagnostic
267 pub fn codemap<'a>(&'a self) -> &'a codemap::CodeMap {
268 self.parse_sess.codemap()
270 // This exists to help with refactoring to eliminate impossible
272 pub fn impossible_case(&self, sp: Span, msg: &str) -> ! {
274 &format!("impossible case reached: {}", msg));
276 pub fn verbose(&self) -> bool { self.opts.debugging_opts.verbose }
277 pub fn time_passes(&self) -> bool { self.opts.debugging_opts.time_passes }
278 pub fn count_llvm_insns(&self) -> bool {
279 self.opts.debugging_opts.count_llvm_insns
281 pub fn count_type_sizes(&self) -> bool {
282 self.opts.debugging_opts.count_type_sizes
284 pub fn time_llvm_passes(&self) -> bool {
285 self.opts.debugging_opts.time_llvm_passes
287 pub fn trans_stats(&self) -> bool { self.opts.debugging_opts.trans_stats }
288 pub fn meta_stats(&self) -> bool { self.opts.debugging_opts.meta_stats }
289 pub fn asm_comments(&self) -> bool { self.opts.debugging_opts.asm_comments }
290 pub fn no_verify(&self) -> bool { self.opts.debugging_opts.no_verify }
291 pub fn borrowck_stats(&self) -> bool { self.opts.debugging_opts.borrowck_stats }
292 pub fn print_llvm_passes(&self) -> bool {
293 self.opts.debugging_opts.print_llvm_passes
295 pub fn lto(&self) -> bool {
298 pub fn no_landing_pads(&self) -> bool {
299 self.opts.debugging_opts.no_landing_pads
301 pub fn unstable_options(&self) -> bool {
302 self.opts.debugging_opts.unstable_options
304 pub fn print_enum_sizes(&self) -> bool {
305 self.opts.debugging_opts.print_enum_sizes
307 pub fn nonzeroing_move_hints(&self) -> bool {
308 self.opts.debugging_opts.enable_nonzeroing_move_hints
310 pub fn sysroot<'a>(&'a self) -> &'a Path {
311 match self.opts.maybe_sysroot {
312 Some (ref sysroot) => sysroot,
313 None => self.default_sysroot.as_ref()
314 .expect("missing sysroot and default_sysroot in Session")
317 pub fn target_filesearch(&self, kind: PathKind) -> filesearch::FileSearch {
318 filesearch::FileSearch::new(self.sysroot(),
319 &self.opts.target_triple,
320 &self.opts.search_paths,
323 pub fn host_filesearch(&self, kind: PathKind) -> filesearch::FileSearch {
324 filesearch::FileSearch::new(
326 config::host_triple(),
327 &self.opts.search_paths,
332 impl NodeIdAssigner for Session {
333 fn next_node_id(&self) -> NodeId {
334 self.reserve_node_ids(1)
337 fn peek_node_id(&self) -> NodeId {
338 self.next_node_id.get().checked_add(1).unwrap()
342 fn split_msg_into_multilines(msg: &str) -> Option<String> {
343 // Conditions for enabling multi-line errors:
344 if !msg.contains("mismatched types") &&
345 !msg.contains("type mismatch resolving") &&
346 !msg.contains("if and else have incompatible types") &&
347 !msg.contains("if may be missing an else clause") &&
348 !msg.contains("match arms have incompatible types") &&
349 !msg.contains("structure constructor specifies a structure of type") &&
350 !msg.contains("has an incompatible type for trait") {
353 let first = msg.match_indices("expected").filter(|s| {
354 s.0 > 0 && (msg.char_at_reverse(s.0) == ' ' ||
355 msg.char_at_reverse(s.0) == '(')
356 }).map(|(a, b)| (a - 1, a + b.len()));
357 let second = msg.match_indices("found").filter(|s| {
358 msg.char_at_reverse(s.0) == ' '
359 }).map(|(a, b)| (a - 1, a + b.len()));
361 let mut new_msg = String::new();
364 // Insert `\n` before expected and found.
365 for (pos1, pos2) in first.zip(second) {
367 // A `(` may be preceded by a space and it should be trimmed
368 msg[head..pos1.0].trim_right() + // prefix
369 "\n" + // insert before first
370 &msg[pos1.0..pos1.1] + // insert what first matched
371 &msg[pos1.1..pos2.0] + // between matches
372 "\n " + // insert before second
374 // `expected` is 3 char longer than `found`. To align the types,
375 // `found` gets 3 spaces prepended.
376 &msg[pos2.0..pos2.1]; // insert what second matched
381 let mut tail = &msg[head..];
382 let third = tail.find("(values differ")
383 .or(tail.find("(lifetime"))
384 .or(tail.find("(cyclic type of infinite size"));
385 // Insert `\n` before any remaining messages which match.
386 if let Some(pos) = third {
387 // The end of the message may just be wrapped in `()` without
388 // `expected`/`found`. Push this also to a new line and add the
391 // `(` is usually preceded by a space and should be trimmed.
392 tail[..pos].trim_right() + // prefix
393 "\n" + // insert before paren
394 &tail[pos..]; // append the tail
399 new_msg.push_str(tail);
400 return Some(new_msg);
403 pub fn build_session(sopts: config::Options,
404 local_crate_source_file: Option<PathBuf>,
405 registry: diagnostics::registry::Registry,
406 cstore: Rc<for<'a> CrateStore<'a>>)
408 // FIXME: This is not general enough to make the warning lint completely override
409 // normal diagnostic warnings, since the warning lint can also be denied and changed
410 // later via the source code.
411 let can_print_warnings = sopts.lint_opts
413 .filter(|&&(ref key, _)| *key == "warnings")
414 .map(|&(_, ref level)| *level != lint::Allow)
418 let codemap = Rc::new(codemap::CodeMap::new());
419 let diagnostic_handler =
420 errors::Handler::new(sopts.color, Some(registry), can_print_warnings, codemap.clone());
422 build_session_(sopts, local_crate_source_file, diagnostic_handler, codemap, cstore)
425 pub fn build_session_(sopts: config::Options,
426 local_crate_source_file: Option<PathBuf>,
427 span_diagnostic: errors::Handler,
428 codemap: Rc<codemap::CodeMap>,
429 cstore: Rc<for<'a> CrateStore<'a>>)
431 let host = match Target::search(config::host_triple()) {
434 panic!(span_diagnostic.fatal(&format!("Error loading host specification: {}", e)));
437 let target_cfg = config::build_target_config(&sopts, &span_diagnostic);
438 let p_s = parse::ParseSess::with_span_handler(span_diagnostic, codemap);
439 let default_sysroot = match sopts.maybe_sysroot {
441 None => Some(filesearch::get_or_default_sysroot())
444 // Make the path absolute, if necessary
445 let local_crate_source_file = local_crate_source_file.map(|path|
446 if path.is_absolute() {
449 env::current_dir().unwrap().join(&path)
453 let can_print_warnings = sopts.lint_opts
455 .filter(|&&(ref key, _)| *key == "warnings")
456 .map(|&(_, ref level)| *level != lint::Allow)
466 // For a library crate, this is always none
467 entry_fn: RefCell::new(None),
468 entry_type: Cell::new(None),
469 plugin_registrar_fn: Cell::new(None),
470 default_sysroot: default_sysroot,
471 local_crate_source_file: local_crate_source_file,
472 working_dir: env::current_dir().unwrap(),
473 lint_store: RefCell::new(lint::LintStore::new()),
474 lints: RefCell::new(NodeMap()),
475 plugin_llvm_passes: RefCell::new(Vec::new()),
476 plugin_attributes: RefCell::new(Vec::new()),
477 crate_types: RefCell::new(Vec::new()),
478 dependency_formats: RefCell::new(FnvHashMap()),
479 crate_metadata: RefCell::new(Vec::new()),
480 delayed_span_bug: RefCell::new(None),
481 features: RefCell::new(feature_gate::Features::new()),
482 recursion_limit: Cell::new(64),
483 can_print_warnings: can_print_warnings,
484 next_node_id: Cell::new(1),
485 injected_allocator: Cell::new(None),
486 available_macros: RefCell::new(HashSet::new()),
492 // Seems out of place, but it uses session, so I'm putting it here
493 pub fn expect<T, M>(sess: &Session, opt: Option<T>, msg: M) -> T where
494 M: FnOnce() -> String,
496 errors::expect(sess.diagnostic(), opt, msg)
499 pub fn early_error(color: errors::ColorConfig, msg: &str) -> ! {
500 let mut emitter = BasicEmitter::stderr(color);
501 emitter.emit(None, msg, None, errors::Level::Fatal);
502 panic!(errors::FatalError);
505 pub fn early_warn(color: errors::ColorConfig, msg: &str) {
506 let mut emitter = BasicEmitter::stderr(color);
507 emitter.emit(None, msg, None, errors::Level::Warning);