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.
11 use dep_graph::DepGraph;
12 use hir::def_id::{CrateNum, DefIndex};
15 use middle::cstore::CrateStore;
16 use middle::dependency_format;
17 use session::search_paths::PathKind;
18 use session::config::DebugInfoLevel;
20 use util::nodemap::{NodeMap, FnvHashMap};
21 use util::common::duration_to_secs_str;
22 use mir::transform as mir_pass;
24 use syntax::ast::NodeId;
25 use errors::{self, DiagnosticBuilder};
26 use errors::emitter::{Emitter, EmitterWriter};
27 use syntax::json::JsonEmitter;
28 use syntax::feature_gate;
30 use syntax::parse::ParseSess;
31 use syntax::parse::token;
32 use syntax::{ast, codemap};
33 use syntax::feature_gate::AttributeType;
34 use syntax_pos::{Span, MultiSpan};
36 use rustc_back::PanicStrategy;
37 use rustc_back::target::Target;
38 use rustc_data_structures::flock;
41 use std::path::{Path, PathBuf};
42 use std::cell::{self, Cell, RefCell};
43 use std::collections::HashMap;
45 use std::ffi::CString;
49 use std::time::Duration;
56 // Represents the data associated with a compilation
57 // session for a single crate.
59 pub dep_graph: DepGraph,
60 pub target: config::Config,
62 pub opts: config::Options,
63 pub cstore: Rc<for<'a> CrateStore<'a>>,
64 pub parse_sess: ParseSess,
65 // For a library crate, this is always none
66 pub entry_fn: RefCell<Option<(NodeId, Span)>>,
67 pub entry_type: Cell<Option<config::EntryFnType>>,
68 pub plugin_registrar_fn: Cell<Option<ast::NodeId>>,
69 pub derive_registrar_fn: Cell<Option<ast::NodeId>>,
70 pub default_sysroot: Option<PathBuf>,
71 // The name of the root source file of the crate, in the local file system.
72 // The path is always expected to be absolute. `None` means that there is no
74 pub local_crate_source_file: Option<PathBuf>,
75 pub working_dir: PathBuf,
76 pub lint_store: RefCell<lint::LintStore>,
77 pub lints: RefCell<NodeMap<Vec<(lint::LintId, Span, String)>>>,
78 pub plugin_llvm_passes: RefCell<Vec<String>>,
79 pub mir_passes: RefCell<mir_pass::Passes>,
80 pub plugin_attributes: RefCell<Vec<(String, AttributeType)>>,
81 pub crate_types: RefCell<Vec<config::CrateType>>,
82 pub dependency_formats: RefCell<dependency_format::Dependencies>,
83 // The crate_disambiguator is constructed out of all the `-C metadata`
84 // arguments passed to the compiler. Its value together with the crate-name
85 // forms a unique global identifier for the crate. It is used to allow
86 // multiple crates with the same name to coexist. See the
87 // trans::back::symbol_names module for more information.
88 pub crate_disambiguator: RefCell<token::InternedString>,
89 pub features: RefCell<feature_gate::Features>,
91 /// The maximum recursion limit for potentially infinitely recursive
92 /// operations such as auto-dereference and monomorphization.
93 pub recursion_limit: Cell<usize>,
95 /// The metadata::creader module may inject an allocator/panic_runtime
96 /// dependency if it didn't already find one, and this tracks what was
98 pub injected_allocator: Cell<Option<CrateNum>>,
99 pub injected_panic_runtime: Cell<Option<CrateNum>>,
101 /// Map from imported macro spans (which consist of
102 /// the localized span for the macro body) to the
103 /// macro name and defintion span in the source crate.
104 pub imported_macro_spans: RefCell<HashMap<Span, (String, Span)>>,
106 incr_comp_session: RefCell<IncrCompSession>,
108 /// Some measurements that are being gathered during compilation.
109 pub perf_stats: PerfStats,
111 next_node_id: Cell<ast::NodeId>,
114 pub struct PerfStats {
115 // The accumulated time needed for computing the SVH of the crate
116 pub svh_time: Cell<Duration>,
117 // The accumulated time spent on computing incr. comp. hashes
118 pub incr_comp_hashes_time: Cell<Duration>,
119 // The number of incr. comp. hash computations performed
120 pub incr_comp_hashes_count: Cell<u64>,
121 // The number of bytes hashed when computing ICH values
122 pub incr_comp_bytes_hashed: Cell<u64>,
123 // The accumulated time spent on computing symbol hashes
124 pub symbol_hash_time: Cell<Duration>,
128 pub fn local_crate_disambiguator(&self) -> token::InternedString {
129 self.crate_disambiguator.borrow().clone()
131 pub fn struct_span_warn<'a, S: Into<MultiSpan>>(&'a self,
134 -> DiagnosticBuilder<'a> {
135 self.diagnostic().struct_span_warn(sp, msg)
137 pub fn struct_span_warn_with_code<'a, S: Into<MultiSpan>>(&'a self,
141 -> DiagnosticBuilder<'a> {
142 self.diagnostic().struct_span_warn_with_code(sp, msg, code)
144 pub fn struct_warn<'a>(&'a self, msg: &str) -> DiagnosticBuilder<'a> {
145 self.diagnostic().struct_warn(msg)
147 pub fn struct_span_err<'a, S: Into<MultiSpan>>(&'a self,
150 -> DiagnosticBuilder<'a> {
151 self.diagnostic().struct_span_err(sp, msg)
153 pub fn struct_span_err_with_code<'a, S: Into<MultiSpan>>(&'a self,
157 -> DiagnosticBuilder<'a> {
158 self.diagnostic().struct_span_err_with_code(sp, msg, code)
160 pub fn struct_err<'a>(&'a self, msg: &str) -> DiagnosticBuilder<'a> {
161 self.diagnostic().struct_err(msg)
163 pub fn struct_span_fatal<'a, S: Into<MultiSpan>>(&'a self,
166 -> DiagnosticBuilder<'a> {
167 self.diagnostic().struct_span_fatal(sp, msg)
169 pub fn struct_span_fatal_with_code<'a, S: Into<MultiSpan>>(&'a self,
173 -> DiagnosticBuilder<'a> {
174 self.diagnostic().struct_span_fatal_with_code(sp, msg, code)
176 pub fn struct_fatal<'a>(&'a self, msg: &str) -> DiagnosticBuilder<'a> {
177 self.diagnostic().struct_fatal(msg)
180 pub fn span_fatal<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> ! {
181 panic!(self.diagnostic().span_fatal(sp, msg))
183 pub fn span_fatal_with_code<S: Into<MultiSpan>>(&self, sp: S, msg: &str, code: &str) -> ! {
184 panic!(self.diagnostic().span_fatal_with_code(sp, msg, code))
186 pub fn fatal(&self, msg: &str) -> ! {
187 panic!(self.diagnostic().fatal(msg))
189 pub fn span_err_or_warn<S: Into<MultiSpan>>(&self, is_warning: bool, sp: S, msg: &str) {
191 self.span_warn(sp, msg);
193 self.span_err(sp, msg);
196 pub fn span_err<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
197 self.diagnostic().span_err(sp, msg)
199 pub fn span_err_with_code<S: Into<MultiSpan>>(&self, sp: S, msg: &str, code: &str) {
200 self.diagnostic().span_err_with_code(sp, &msg, code)
202 pub fn err(&self, msg: &str) {
203 self.diagnostic().err(msg)
205 pub fn err_count(&self) -> usize {
206 self.diagnostic().err_count()
208 pub fn has_errors(&self) -> bool {
209 self.diagnostic().has_errors()
211 pub fn abort_if_errors(&self) {
212 self.diagnostic().abort_if_errors();
214 pub fn track_errors<F, T>(&self, f: F) -> Result<T, usize>
215 where F: FnOnce() -> T
217 let old_count = self.err_count();
219 let errors = self.err_count() - old_count;
226 pub fn span_warn<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
227 self.diagnostic().span_warn(sp, msg)
229 pub fn span_warn_with_code<S: Into<MultiSpan>>(&self, sp: S, msg: &str, code: &str) {
230 self.diagnostic().span_warn_with_code(sp, msg, code)
232 pub fn warn(&self, msg: &str) {
233 self.diagnostic().warn(msg)
235 pub fn opt_span_warn<S: Into<MultiSpan>>(&self, opt_sp: Option<S>, msg: &str) {
237 Some(sp) => self.span_warn(sp, msg),
238 None => self.warn(msg),
241 /// Delay a span_bug() call until abort_if_errors()
242 pub fn delay_span_bug<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
243 self.diagnostic().delay_span_bug(sp, msg)
245 pub fn note_without_error(&self, msg: &str) {
246 self.diagnostic().note_without_error(msg)
248 pub fn span_note_without_error<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
249 self.diagnostic().span_note_without_error(sp, msg)
251 pub fn span_unimpl<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> ! {
252 self.diagnostic().span_unimpl(sp, msg)
254 pub fn unimpl(&self, msg: &str) -> ! {
255 self.diagnostic().unimpl(msg)
257 pub fn add_lint(&self,
258 lint: &'static lint::Lint,
262 let lint_id = lint::LintId::of(lint);
263 let mut lints = self.lints.borrow_mut();
264 if let Some(arr) = lints.get_mut(&id) {
265 let tuple = (lint_id, sp, msg);
266 if !arr.contains(&tuple) {
271 lints.insert(id, vec!((lint_id, sp, msg)));
273 pub fn reserve_node_ids(&self, count: usize) -> ast::NodeId {
274 let id = self.next_node_id.get();
276 match id.as_usize().checked_add(count) {
278 self.next_node_id.set(ast::NodeId::new(next));
280 None => bug!("Input too large, ran out of node ids!")
285 pub fn next_node_id(&self) -> NodeId {
286 self.reserve_node_ids(1)
288 pub fn diagnostic<'a>(&'a self) -> &'a errors::Handler {
289 &self.parse_sess.span_diagnostic
291 pub fn codemap<'a>(&'a self) -> &'a codemap::CodeMap {
292 self.parse_sess.codemap()
294 pub fn verbose(&self) -> bool { self.opts.debugging_opts.verbose }
295 pub fn time_passes(&self) -> bool { self.opts.debugging_opts.time_passes }
296 pub fn count_llvm_insns(&self) -> bool {
297 self.opts.debugging_opts.count_llvm_insns
299 pub fn time_llvm_passes(&self) -> bool {
300 self.opts.debugging_opts.time_llvm_passes
302 pub fn trans_stats(&self) -> bool { self.opts.debugging_opts.trans_stats }
303 pub fn meta_stats(&self) -> bool { self.opts.debugging_opts.meta_stats }
304 pub fn asm_comments(&self) -> bool { self.opts.debugging_opts.asm_comments }
305 pub fn no_verify(&self) -> bool { self.opts.debugging_opts.no_verify }
306 pub fn borrowck_stats(&self) -> bool { self.opts.debugging_opts.borrowck_stats }
307 pub fn print_llvm_passes(&self) -> bool {
308 self.opts.debugging_opts.print_llvm_passes
310 pub fn lto(&self) -> bool {
313 /// Returns the panic strategy for this compile session. If the user explicitly selected one
314 /// using '-C panic', use that, otherwise use the panic strategy defined by the target.
315 pub fn panic_strategy(&self) -> PanicStrategy {
316 self.opts.cg.panic.unwrap_or(self.target.target.options.panic_strategy)
318 pub fn no_landing_pads(&self) -> bool {
319 self.opts.debugging_opts.no_landing_pads || self.panic_strategy() == PanicStrategy::Abort
321 pub fn unstable_options(&self) -> bool {
322 self.opts.debugging_opts.unstable_options
324 pub fn nonzeroing_move_hints(&self) -> bool {
325 self.opts.debugging_opts.enable_nonzeroing_move_hints
328 pub fn must_not_eliminate_frame_pointers(&self) -> bool {
329 self.opts.debuginfo != DebugInfoLevel::NoDebugInfo ||
330 !self.target.target.options.eliminate_frame_pointer
333 /// Returns the symbol name for the registrar function,
334 /// given the crate Svh and the function DefIndex.
335 pub fn generate_plugin_registrar_symbol(&self, svh: &Svh, index: DefIndex)
337 format!("__rustc_plugin_registrar__{}_{}", svh, index.as_usize())
340 pub fn generate_derive_registrar_symbol(&self,
342 index: DefIndex) -> String {
343 format!("__rustc_derive_registrar__{}_{}", svh, index.as_usize())
346 pub fn sysroot<'a>(&'a self) -> &'a Path {
347 match self.opts.maybe_sysroot {
348 Some (ref sysroot) => sysroot,
349 None => self.default_sysroot.as_ref()
350 .expect("missing sysroot and default_sysroot in Session")
353 pub fn target_filesearch(&self, kind: PathKind) -> filesearch::FileSearch {
354 filesearch::FileSearch::new(self.sysroot(),
355 &self.opts.target_triple,
356 &self.opts.search_paths,
359 pub fn host_filesearch(&self, kind: PathKind) -> filesearch::FileSearch {
360 filesearch::FileSearch::new(
362 config::host_triple(),
363 &self.opts.search_paths,
367 pub fn init_incr_comp_session(&self,
368 session_dir: PathBuf,
369 lock_file: flock::Lock) {
370 let mut incr_comp_session = self.incr_comp_session.borrow_mut();
372 if let IncrCompSession::NotInitialized = *incr_comp_session { } else {
373 bug!("Trying to initialize IncrCompSession `{:?}`", *incr_comp_session)
376 *incr_comp_session = IncrCompSession::Active {
377 session_directory: session_dir,
378 lock_file: lock_file,
382 pub fn finalize_incr_comp_session(&self, new_directory_path: PathBuf) {
383 let mut incr_comp_session = self.incr_comp_session.borrow_mut();
385 if let IncrCompSession::Active { .. } = *incr_comp_session { } else {
386 bug!("Trying to finalize IncrCompSession `{:?}`", *incr_comp_session)
389 // Note: This will also drop the lock file, thus unlocking the directory
390 *incr_comp_session = IncrCompSession::Finalized {
391 session_directory: new_directory_path,
395 pub fn mark_incr_comp_session_as_invalid(&self) {
396 let mut incr_comp_session = self.incr_comp_session.borrow_mut();
398 let session_directory = match *incr_comp_session {
399 IncrCompSession::Active { ref session_directory, .. } => {
400 session_directory.clone()
402 _ => bug!("Trying to invalidate IncrCompSession `{:?}`",
406 // Note: This will also drop the lock file, thus unlocking the directory
407 *incr_comp_session = IncrCompSession::InvalidBecauseOfErrors {
408 session_directory: session_directory
412 pub fn incr_comp_session_dir(&self) -> cell::Ref<PathBuf> {
413 let incr_comp_session = self.incr_comp_session.borrow();
414 cell::Ref::map(incr_comp_session, |incr_comp_session| {
415 match *incr_comp_session {
416 IncrCompSession::NotInitialized => {
417 bug!("Trying to get session directory from IncrCompSession `{:?}`",
420 IncrCompSession::Active { ref session_directory, .. } |
421 IncrCompSession::Finalized { ref session_directory } |
422 IncrCompSession::InvalidBecauseOfErrors { ref session_directory } => {
429 pub fn incr_comp_session_dir_opt(&self) -> Option<cell::Ref<PathBuf>> {
430 if self.opts.incremental.is_some() {
431 Some(self.incr_comp_session_dir())
437 pub fn print_perf_stats(&self) {
438 println!("Total time spent computing SVHs: {}",
439 duration_to_secs_str(self.perf_stats.svh_time.get()));
440 println!("Total time spent computing incr. comp. hashes: {}",
441 duration_to_secs_str(self.perf_stats.incr_comp_hashes_time.get()));
442 println!("Total number of incr. comp. hashes computed: {}",
443 self.perf_stats.incr_comp_hashes_count.get());
444 println!("Total number of bytes hashed for incr. comp.: {}",
445 self.perf_stats.incr_comp_bytes_hashed.get());
446 println!("Average bytes hashed per incr. comp. HIR node: {}",
447 self.perf_stats.incr_comp_bytes_hashed.get() /
448 self.perf_stats.incr_comp_hashes_count.get());
449 println!("Total time spent computing symbol hashes: {}",
450 duration_to_secs_str(self.perf_stats.symbol_hash_time.get()));
454 pub fn build_session(sopts: config::Options,
455 dep_graph: &DepGraph,
456 local_crate_source_file: Option<PathBuf>,
457 registry: errors::registry::Registry,
458 cstore: Rc<for<'a> CrateStore<'a>>)
460 build_session_with_codemap(sopts,
462 local_crate_source_file,
465 Rc::new(codemap::CodeMap::new()),
469 pub fn build_session_with_codemap(sopts: config::Options,
470 dep_graph: &DepGraph,
471 local_crate_source_file: Option<PathBuf>,
472 registry: errors::registry::Registry,
473 cstore: Rc<for<'a> CrateStore<'a>>,
474 codemap: Rc<codemap::CodeMap>,
475 emitter_dest: Option<Box<Write + Send>>)
477 // FIXME: This is not general enough to make the warning lint completely override
478 // normal diagnostic warnings, since the warning lint can also be denied and changed
479 // later via the source code.
480 let can_print_warnings = sopts.lint_opts
482 .filter(|&&(ref key, _)| *key == "warnings")
483 .map(|&(_, ref level)| *level != lint::Allow)
486 let treat_err_as_bug = sopts.debugging_opts.treat_err_as_bug;
488 let emitter: Box<Emitter> = match (sopts.error_format, emitter_dest) {
489 (config::ErrorOutputType::HumanReadable(color_config), None) => {
490 Box::new(EmitterWriter::stderr(color_config,
491 Some(codemap.clone())))
493 (config::ErrorOutputType::HumanReadable(_), Some(dst)) => {
494 Box::new(EmitterWriter::new(dst,
495 Some(codemap.clone())))
497 (config::ErrorOutputType::Json, None) => {
498 Box::new(JsonEmitter::stderr(Some(registry), codemap.clone()))
500 (config::ErrorOutputType::Json, Some(dst)) => {
501 Box::new(JsonEmitter::new(dst, Some(registry), codemap.clone()))
505 let diagnostic_handler =
506 errors::Handler::with_emitter(can_print_warnings,
510 build_session_(sopts,
512 local_crate_source_file,
518 pub fn build_session_(sopts: config::Options,
519 dep_graph: &DepGraph,
520 local_crate_source_file: Option<PathBuf>,
521 span_diagnostic: errors::Handler,
522 codemap: Rc<codemap::CodeMap>,
523 cstore: Rc<for<'a> CrateStore<'a>>)
525 let host = match Target::search(config::host_triple()) {
528 panic!(span_diagnostic.fatal(&format!("Error loading host specification: {}", e)));
531 let target_cfg = config::build_target_config(&sopts, &span_diagnostic);
532 let p_s = parse::ParseSess::with_span_handler(span_diagnostic, codemap);
533 let default_sysroot = match sopts.maybe_sysroot {
535 None => Some(filesearch::get_or_default_sysroot())
538 // Make the path absolute, if necessary
539 let local_crate_source_file = local_crate_source_file.map(|path|
540 if path.is_absolute() {
543 env::current_dir().unwrap().join(&path)
548 dep_graph: dep_graph.clone(),
554 // For a library crate, this is always none
555 entry_fn: RefCell::new(None),
556 entry_type: Cell::new(None),
557 plugin_registrar_fn: Cell::new(None),
558 derive_registrar_fn: Cell::new(None),
559 default_sysroot: default_sysroot,
560 local_crate_source_file: local_crate_source_file,
561 working_dir: env::current_dir().unwrap(),
562 lint_store: RefCell::new(lint::LintStore::new()),
563 lints: RefCell::new(NodeMap()),
564 plugin_llvm_passes: RefCell::new(Vec::new()),
565 mir_passes: RefCell::new(mir_pass::Passes::new()),
566 plugin_attributes: RefCell::new(Vec::new()),
567 crate_types: RefCell::new(Vec::new()),
568 dependency_formats: RefCell::new(FnvHashMap()),
569 crate_disambiguator: RefCell::new(token::intern("").as_str()),
570 features: RefCell::new(feature_gate::Features::new()),
571 recursion_limit: Cell::new(64),
572 next_node_id: Cell::new(NodeId::new(1)),
573 injected_allocator: Cell::new(None),
574 injected_panic_runtime: Cell::new(None),
575 imported_macro_spans: RefCell::new(HashMap::new()),
576 incr_comp_session: RefCell::new(IncrCompSession::NotInitialized),
577 perf_stats: PerfStats {
578 svh_time: Cell::new(Duration::from_secs(0)),
579 incr_comp_hashes_time: Cell::new(Duration::from_secs(0)),
580 incr_comp_hashes_count: Cell::new(0),
581 incr_comp_bytes_hashed: Cell::new(0),
582 symbol_hash_time: Cell::new(Duration::from_secs(0)),
591 /// Holds data on the current incremental compilation session, if there is one.
593 pub enum IncrCompSession {
594 // This is the state the session will be in until the incr. comp. dir is
597 // This is the state during which the session directory is private and can
600 session_directory: PathBuf,
601 lock_file: flock::Lock,
603 // This is the state after the session directory has been finalized. In this
604 // state, the contents of the directory must not be modified any more.
606 session_directory: PathBuf,
608 // This is an error state that is reached when some compilation error has
609 // occurred. It indicates that the contents of the session directory must
610 // not be used, since they might be invalid.
611 InvalidBecauseOfErrors {
612 session_directory: PathBuf,
616 fn init_llvm(sess: &Session) {
618 // Before we touch LLVM, make sure that multithreading is enabled.
620 static INIT: Once = Once::new();
621 static mut POISONED: bool = false;
623 if llvm::LLVMStartMultithreaded() != 1 {
624 // use an extra bool to make sure that all future usage of LLVM
625 // cannot proceed despite the Once not running more than once.
629 configure_llvm(sess);
633 bug!("couldn't enable multi-threaded LLVM");
638 unsafe fn configure_llvm(sess: &Session) {
639 let mut llvm_c_strs = Vec::new();
640 let mut llvm_args = Vec::new();
643 let mut add = |arg: &str| {
644 let s = CString::new(arg).unwrap();
645 llvm_args.push(s.as_ptr());
648 add("rustc"); // fake program name
649 if sess.time_llvm_passes() { add("-time-passes"); }
650 if sess.print_llvm_passes() { add("-debug-pass=Structure"); }
652 for arg in &sess.opts.cg.llvm_args {
657 llvm::LLVMInitializePasses();
659 llvm::initialize_available_targets();
661 llvm::LLVMRustSetLLVMOptions(llvm_args.len() as c_int,
665 pub fn early_error(output: config::ErrorOutputType, msg: &str) -> ! {
666 let emitter: Box<Emitter> = match output {
667 config::ErrorOutputType::HumanReadable(color_config) => {
668 Box::new(EmitterWriter::stderr(color_config,
671 config::ErrorOutputType::Json => Box::new(JsonEmitter::basic()),
673 let handler = errors::Handler::with_emitter(true, false, emitter);
674 handler.emit(&MultiSpan::new(), msg, errors::Level::Fatal);
675 panic!(errors::FatalError);
678 pub fn early_warn(output: config::ErrorOutputType, msg: &str) {
679 let emitter: Box<Emitter> = match output {
680 config::ErrorOutputType::HumanReadable(color_config) => {
681 Box::new(EmitterWriter::stderr(color_config,
684 config::ErrorOutputType::Json => Box::new(JsonEmitter::basic()),
686 let handler = errors::Handler::with_emitter(true, false, emitter);
687 handler.emit(&MultiSpan::new(), msg, errors::Level::Warning);
690 // Err(0) means compilation was stopped, but no errors were found.
691 // This would be better as a dedicated enum, but using try! is so convenient.
692 pub type CompileResult = Result<(), usize>;
694 pub fn compile_result_from_err_count(err_count: usize) -> CompileResult {
704 pub fn bug_fmt(file: &'static str, line: u32, args: fmt::Arguments) -> ! {
705 // this wrapper mostly exists so I don't have to write a fully
706 // qualified path of None::<Span> inside the bug!() macro defintion
707 opt_span_bug_fmt(file, line, None::<Span>, args);
712 pub fn span_bug_fmt<S: Into<MultiSpan>>(file: &'static str,
715 args: fmt::Arguments) -> ! {
716 opt_span_bug_fmt(file, line, Some(span), args);
719 fn opt_span_bug_fmt<S: Into<MultiSpan>>(file: &'static str,
722 args: fmt::Arguments) -> ! {
723 tls::with_opt(move |tcx| {
724 let msg = format!("{}:{}: {}", file, line, args);
726 (Some(tcx), Some(span)) => tcx.sess.diagnostic().span_bug(span, &msg),
727 (Some(tcx), None) => tcx.sess.diagnostic().bug(&msg),
728 (None, _) => panic!(msg)