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;
19 use syntax::diagnostic::{self, Emitter};
20 use syntax::diagnostics;
21 use syntax::feature_gate;
23 use syntax::parse::ParseSess;
24 use syntax::{ast, codemap};
25 use syntax::feature_gate::AttributeType;
27 use rustc_back::target::Target;
29 use std::path::{Path, PathBuf};
30 use std::cell::{Cell, RefCell};
31 use std::collections::HashSet;
39 // Represents the data associated with a compilation
40 // session for a single crate.
42 pub target: config::Config,
44 pub opts: config::Options,
45 pub cstore: Rc<for<'a> CrateStore<'a>>,
46 pub parse_sess: ParseSess,
47 // For a library crate, this is always none
48 pub entry_fn: RefCell<Option<(NodeId, codemap::Span)>>,
49 pub entry_type: Cell<Option<config::EntryFnType>>,
50 pub plugin_registrar_fn: Cell<Option<ast::NodeId>>,
51 pub default_sysroot: Option<PathBuf>,
52 // The name of the root source file of the crate, in the local file system.
53 // The path is always expected to be absolute. `None` means that there is no
55 pub local_crate_source_file: Option<PathBuf>,
56 pub working_dir: PathBuf,
57 pub lint_store: RefCell<lint::LintStore>,
58 pub lints: RefCell<NodeMap<Vec<(lint::LintId, codemap::Span, String)>>>,
59 pub plugin_llvm_passes: RefCell<Vec<String>>,
60 pub plugin_attributes: RefCell<Vec<(String, AttributeType)>>,
61 pub crate_types: RefCell<Vec<config::CrateType>>,
62 pub dependency_formats: RefCell<dependency_format::Dependencies>,
63 pub crate_metadata: RefCell<Vec<String>>,
64 pub features: RefCell<feature_gate::Features>,
66 pub delayed_span_bug: RefCell<Option<(codemap::Span, String)>>,
68 /// The maximum recursion limit for potentially infinitely recursive
69 /// operations such as auto-dereference and monomorphization.
70 pub recursion_limit: Cell<usize>,
72 pub can_print_warnings: bool,
74 /// The metadata::creader module may inject an allocator dependency if it
75 /// didn't already find one, and this tracks what was injected.
76 pub injected_allocator: Cell<Option<ast::CrateNum>>,
78 /// Names of all bang-style macros and syntax extensions
79 /// available in this crate
80 pub available_macros: RefCell<HashSet<Name>>,
82 next_node_id: Cell<ast::NodeId>,
86 pub fn span_fatal(&self, sp: Span, msg: &str) -> ! {
87 if self.opts.treat_err_as_bug {
88 self.span_bug(sp, msg);
90 panic!(self.diagnostic().span_fatal(sp, msg))
92 pub fn span_fatal_with_code(&self, sp: Span, msg: &str, code: &str) -> ! {
93 if self.opts.treat_err_as_bug {
94 self.span_bug(sp, msg);
96 panic!(self.diagnostic().span_fatal_with_code(sp, msg, code))
98 pub fn fatal(&self, msg: &str) -> ! {
99 if self.opts.treat_err_as_bug {
102 panic!(self.diagnostic().handler().fatal(msg))
104 pub fn span_err_or_warn(&self, is_warning: bool, sp: Span, msg: &str) {
106 self.span_warn(sp, msg);
108 self.span_err(sp, msg);
111 pub fn span_err(&self, sp: Span, msg: &str) {
112 if self.opts.treat_err_as_bug {
113 self.span_bug(sp, msg);
115 match split_msg_into_multilines(msg) {
116 Some(msg) => self.diagnostic().span_err(sp, &msg[..]),
117 None => self.diagnostic().span_err(sp, msg)
120 pub fn note_rfc_1214(&self, span: Span) {
123 &format!("this warning results from recent bug fixes and clarifications; \
124 it will become a HARD ERROR in the next release. \
125 See RFC 1214 for details."));
127 pub fn span_err_with_code(&self, sp: Span, msg: &str, code: &str) {
128 if self.opts.treat_err_as_bug {
129 self.span_bug(sp, msg);
131 match split_msg_into_multilines(msg) {
132 Some(msg) => self.diagnostic().span_err_with_code(sp, &msg[..], code),
133 None => self.diagnostic().span_err_with_code(sp, msg, code)
136 pub fn err(&self, msg: &str) {
137 if self.opts.treat_err_as_bug {
140 self.diagnostic().handler().err(msg)
142 pub fn err_count(&self) -> usize {
143 self.diagnostic().handler().err_count()
145 pub fn has_errors(&self) -> bool {
146 self.diagnostic().handler().has_errors()
148 pub fn abort_if_errors(&self) {
149 self.diagnostic().handler().abort_if_errors();
151 let delayed_bug = self.delayed_span_bug.borrow();
153 Some((span, ref errmsg)) => {
154 self.diagnostic().span_bug(span, errmsg);
159 pub fn abort_if_new_errors<F>(&self, mut f: F)
162 let count = self.err_count();
164 if self.err_count() > count {
165 self.abort_if_errors();
168 pub fn span_warn(&self, sp: Span, msg: &str) {
169 if self.can_print_warnings {
170 self.diagnostic().span_warn(sp, msg)
173 pub fn span_warn_with_code(&self, sp: Span, msg: &str, code: &str) {
174 if self.can_print_warnings {
175 self.diagnostic().span_warn_with_code(sp, msg, code)
178 pub fn warn(&self, msg: &str) {
179 if self.can_print_warnings {
180 self.diagnostic().handler().warn(msg)
183 pub fn opt_span_warn(&self, opt_sp: Option<Span>, msg: &str) {
185 Some(sp) => self.span_warn(sp, msg),
186 None => self.warn(msg),
189 pub fn span_note(&self, sp: Span, msg: &str) {
190 self.diagnostic().span_note(sp, msg)
192 pub fn span_end_note(&self, sp: Span, msg: &str) {
193 self.diagnostic().span_end_note(sp, msg)
196 /// Prints out a message with a suggested edit of the code.
198 /// See `diagnostic::RenderSpan::Suggestion` for more information.
199 pub fn span_suggestion(&self, sp: Span, msg: &str, suggestion: String) {
200 self.diagnostic().span_suggestion(sp, msg, suggestion)
202 pub fn span_help(&self, sp: Span, msg: &str) {
203 self.diagnostic().span_help(sp, msg)
205 pub fn fileline_note(&self, sp: Span, msg: &str) {
206 self.diagnostic().fileline_note(sp, msg)
208 pub fn fileline_help(&self, sp: Span, msg: &str) {
209 self.diagnostic().fileline_help(sp, msg)
211 pub fn note(&self, msg: &str) {
212 self.diagnostic().handler().note(msg)
214 pub fn help(&self, msg: &str) {
215 self.diagnostic().handler().help(msg)
217 pub fn opt_span_bug(&self, opt_sp: Option<Span>, msg: &str) -> ! {
219 Some(sp) => self.span_bug(sp, msg),
220 None => self.bug(msg),
223 /// Delay a span_bug() call until abort_if_errors()
224 pub fn delay_span_bug(&self, sp: Span, msg: &str) {
225 let mut delayed = self.delayed_span_bug.borrow_mut();
226 *delayed = Some((sp, msg.to_string()));
228 pub fn span_bug(&self, sp: Span, msg: &str) -> ! {
229 self.diagnostic().span_bug(sp, msg)
231 pub fn bug(&self, msg: &str) -> ! {
232 self.diagnostic().handler().bug(msg)
234 pub fn span_unimpl(&self, sp: Span, msg: &str) -> ! {
235 self.diagnostic().span_unimpl(sp, msg)
237 pub fn unimpl(&self, msg: &str) -> ! {
238 self.diagnostic().handler().unimpl(msg)
240 pub fn add_lint(&self,
241 lint: &'static lint::Lint,
245 let lint_id = lint::LintId::of(lint);
246 let mut lints = self.lints.borrow_mut();
247 match lints.get_mut(&id) {
248 Some(arr) => { arr.push((lint_id, sp, msg)); return; }
251 lints.insert(id, vec!((lint_id, sp, msg)));
253 pub fn reserve_node_ids(&self, count: ast::NodeId) -> ast::NodeId {
254 let id = self.next_node_id.get();
256 match id.checked_add(count) {
257 Some(next) => self.next_node_id.set(next),
258 None => self.bug("Input too large, ran out of node ids!")
263 pub fn diagnostic<'a>(&'a self) -> &'a diagnostic::SpanHandler {
264 &self.parse_sess.span_diagnostic
266 pub fn codemap<'a>(&'a self) -> &'a codemap::CodeMap {
267 self.parse_sess.codemap()
269 // This exists to help with refactoring to eliminate impossible
271 pub fn impossible_case(&self, sp: Span, msg: &str) -> ! {
273 &format!("impossible case reached: {}", msg));
275 pub fn verbose(&self) -> bool { self.opts.debugging_opts.verbose }
276 pub fn time_passes(&self) -> bool { self.opts.debugging_opts.time_passes }
277 pub fn count_llvm_insns(&self) -> bool {
278 self.opts.debugging_opts.count_llvm_insns
280 pub fn count_type_sizes(&self) -> bool {
281 self.opts.debugging_opts.count_type_sizes
283 pub fn time_llvm_passes(&self) -> bool {
284 self.opts.debugging_opts.time_llvm_passes
286 pub fn trans_stats(&self) -> bool { self.opts.debugging_opts.trans_stats }
287 pub fn meta_stats(&self) -> bool { self.opts.debugging_opts.meta_stats }
288 pub fn asm_comments(&self) -> bool { self.opts.debugging_opts.asm_comments }
289 pub fn no_verify(&self) -> bool { self.opts.debugging_opts.no_verify }
290 pub fn borrowck_stats(&self) -> bool { self.opts.debugging_opts.borrowck_stats }
291 pub fn print_llvm_passes(&self) -> bool {
292 self.opts.debugging_opts.print_llvm_passes
294 pub fn lto(&self) -> bool {
297 pub fn no_landing_pads(&self) -> bool {
298 self.opts.debugging_opts.no_landing_pads
300 pub fn unstable_options(&self) -> bool {
301 self.opts.debugging_opts.unstable_options
303 pub fn print_enum_sizes(&self) -> bool {
304 self.opts.debugging_opts.print_enum_sizes
306 pub fn nonzeroing_move_hints(&self) -> bool {
307 self.opts.debugging_opts.enable_nonzeroing_move_hints
309 pub fn sysroot<'a>(&'a self) -> &'a Path {
310 match self.opts.maybe_sysroot {
311 Some (ref sysroot) => sysroot,
312 None => self.default_sysroot.as_ref()
313 .expect("missing sysroot and default_sysroot in Session")
316 pub fn target_filesearch(&self, kind: PathKind) -> filesearch::FileSearch {
317 filesearch::FileSearch::new(self.sysroot(),
318 &self.opts.target_triple,
319 &self.opts.search_paths,
322 pub fn host_filesearch(&self, kind: PathKind) -> filesearch::FileSearch {
323 filesearch::FileSearch::new(
325 config::host_triple(),
326 &self.opts.search_paths,
331 impl NodeIdAssigner for Session {
332 fn next_node_id(&self) -> NodeId {
333 self.reserve_node_ids(1)
336 fn peek_node_id(&self) -> NodeId {
337 self.next_node_id.get().checked_add(1).unwrap()
341 fn split_msg_into_multilines(msg: &str) -> Option<String> {
342 // Conditions for enabling multi-line errors:
343 if !msg.contains("mismatched types") &&
344 !msg.contains("type mismatch resolving") &&
345 !msg.contains("if and else have incompatible types") &&
346 !msg.contains("if may be missing an else clause") &&
347 !msg.contains("match arms have incompatible types") &&
348 !msg.contains("structure constructor specifies a structure of type") &&
349 !msg.contains("has an incompatible type for trait") {
352 let first = msg.match_indices("expected").filter(|s| {
353 s.0 > 0 && (msg.char_at_reverse(s.0) == ' ' ||
354 msg.char_at_reverse(s.0) == '(')
355 }).map(|(a, b)| (a - 1, a + b.len()));
356 let second = msg.match_indices("found").filter(|s| {
357 msg.char_at_reverse(s.0) == ' '
358 }).map(|(a, b)| (a - 1, a + b.len()));
360 let mut new_msg = String::new();
363 // Insert `\n` before expected and found.
364 for (pos1, pos2) in first.zip(second) {
366 // A `(` may be preceded by a space and it should be trimmed
367 msg[head..pos1.0].trim_right() + // prefix
368 "\n" + // insert before first
369 &msg[pos1.0..pos1.1] + // insert what first matched
370 &msg[pos1.1..pos2.0] + // between matches
371 "\n " + // insert before second
373 // `expected` is 3 char longer than `found`. To align the types,
374 // `found` gets 3 spaces prepended.
375 &msg[pos2.0..pos2.1]; // insert what second matched
380 let mut tail = &msg[head..];
381 let third = tail.find("(values differ")
382 .or(tail.find("(lifetime"))
383 .or(tail.find("(cyclic type of infinite size"));
384 // Insert `\n` before any remaining messages which match.
385 if let Some(pos) = third {
386 // The end of the message may just be wrapped in `()` without
387 // `expected`/`found`. Push this also to a new line and add the
390 // `(` is usually preceded by a space and should be trimmed.
391 tail[..pos].trim_right() + // prefix
392 "\n" + // insert before paren
393 &tail[pos..]; // append the tail
398 new_msg.push_str(tail);
399 return Some(new_msg);
402 pub fn build_session(sopts: config::Options,
403 local_crate_source_file: Option<PathBuf>,
404 registry: diagnostics::registry::Registry,
405 cstore: Rc<for<'a> CrateStore<'a>>)
407 // FIXME: This is not general enough to make the warning lint completely override
408 // normal diagnostic warnings, since the warning lint can also be denied and changed
409 // later via the source code.
410 let can_print_warnings = sopts.lint_opts
412 .filter(|&&(ref key, _)| *key == "warnings")
413 .map(|&(_, ref level)| *level != lint::Allow)
417 let codemap = codemap::CodeMap::new();
418 let diagnostic_handler =
419 diagnostic::Handler::new(sopts.color, Some(registry), can_print_warnings);
420 let span_diagnostic_handler =
421 diagnostic::SpanHandler::new(diagnostic_handler, codemap);
423 build_session_(sopts, local_crate_source_file, span_diagnostic_handler, cstore)
426 pub fn build_session_(sopts: config::Options,
427 local_crate_source_file: Option<PathBuf>,
428 span_diagnostic: diagnostic::SpanHandler,
429 cstore: Rc<for<'a> CrateStore<'a>>)
431 let host = match Target::search(config::host_triple()) {
434 panic!(span_diagnostic.handler()
435 .fatal(&format!("Error loading host specification: {}", e)));
438 let target_cfg = config::build_target_config(&sopts, &span_diagnostic);
439 let p_s = parse::ParseSess::with_span_handler(span_diagnostic);
440 let default_sysroot = match sopts.maybe_sysroot {
442 None => Some(filesearch::get_or_default_sysroot())
445 // Make the path absolute, if necessary
446 let local_crate_source_file = local_crate_source_file.map(|path|
447 if path.is_absolute() {
450 env::current_dir().unwrap().join(&path)
454 let can_print_warnings = sopts.lint_opts
456 .filter(|&&(ref key, _)| *key == "warnings")
457 .map(|&(_, ref level)| *level != lint::Allow)
467 // For a library crate, this is always none
468 entry_fn: RefCell::new(None),
469 entry_type: Cell::new(None),
470 plugin_registrar_fn: Cell::new(None),
471 default_sysroot: default_sysroot,
472 local_crate_source_file: local_crate_source_file,
473 working_dir: env::current_dir().unwrap(),
474 lint_store: RefCell::new(lint::LintStore::new()),
475 lints: RefCell::new(NodeMap()),
476 plugin_llvm_passes: RefCell::new(Vec::new()),
477 plugin_attributes: RefCell::new(Vec::new()),
478 crate_types: RefCell::new(Vec::new()),
479 dependency_formats: RefCell::new(FnvHashMap()),
480 crate_metadata: RefCell::new(Vec::new()),
481 delayed_span_bug: RefCell::new(None),
482 features: RefCell::new(feature_gate::Features::new()),
483 recursion_limit: Cell::new(64),
484 can_print_warnings: can_print_warnings,
485 next_node_id: Cell::new(1),
486 injected_allocator: Cell::new(None),
487 available_macros: RefCell::new(HashSet::new()),
493 // Seems out of place, but it uses session, so I'm putting it here
494 pub fn expect<T, M>(sess: &Session, opt: Option<T>, msg: M) -> T where
495 M: FnOnce() -> String,
497 diagnostic::expect(sess.diagnostic(), opt, msg)
500 pub fn early_error(color: diagnostic::ColorConfig, msg: &str) -> ! {
501 let mut emitter = diagnostic::EmitterWriter::stderr(color, None);
502 emitter.emit(None, msg, None, diagnostic::Fatal);
503 panic!(diagnostic::FatalError);
506 pub fn early_warn(color: diagnostic::ColorConfig, msg: &str) {
507 let mut emitter = diagnostic::EmitterWriter::stderr(color, None);
508 emitter.emit(None, msg, None, diagnostic::Warning);