1 use crate::interface
::{Compiler, Result}
;
2 use crate::passes
::{self, BoxedResolver, QueryContext}
;
5 use rustc_codegen_ssa
::traits
::CodegenBackend
;
6 use rustc_data_structures
::steal
::Steal
;
7 use rustc_data_structures
::svh
::Svh
;
8 use rustc_data_structures
::sync
::{Lrc, OnceCell, WorkerLocal}
;
9 use rustc_errors
::ErrorReported
;
10 use rustc_hir
::def_id
::LOCAL_CRATE
;
12 use rustc_incremental
::DepGraphFuture
;
13 use rustc_lint
::LintStore
;
14 use rustc_middle
::arena
::Arena
;
15 use rustc_middle
::dep_graph
::DepGraph
;
16 use rustc_middle
::ty
::{GlobalCtxt, ResolverOutputs, TyCtxt}
;
17 use rustc_query_impl
::Queries
as TcxQueries
;
18 use rustc_serialize
::json
;
19 use rustc_session
::config
::{self, OutputFilenames, OutputType}
;
20 use rustc_session
::{output::find_crate_name, Session}
;
21 use rustc_span
::symbol
::sym
;
23 use std
::cell
::{Ref, RefCell, RefMut}
;
26 /// Represent the result of a query.
28 /// This result can be stolen with the [`take`] method and generated with the [`compute`] method.
30 /// [`take`]: Self::take
31 /// [`compute`]: Self::compute
33 result
: RefCell
<Option
<Result
<T
>>>,
37 fn compute
<F
: FnOnce() -> Result
<T
>>(&self, f
: F
) -> Result
<&Query
<T
>> {
38 let mut result
= self.result
.borrow_mut();
42 result
.as_ref().unwrap().as_ref().map(|_
| self).map_err(|err
| *err
)
45 /// Takes ownership of the query result. Further attempts to take or peek the query
46 /// result will panic unless it is generated by calling the `compute` method.
47 pub fn take(&self) -> T
{
48 self.result
.borrow_mut().take().expect("missing query result").unwrap()
51 /// Borrows the query result using the RefCell. Panics if the result is stolen.
52 pub fn peek(&self) -> Ref
<'_
, T
> {
53 Ref
::map(self.result
.borrow(), |r
| {
54 r
.as_ref().unwrap().as_ref().expect("missing query result")
58 /// Mutably borrows the query result using the RefCell. Panics if the result is stolen.
59 pub fn peek_mut(&self) -> RefMut
<'_
, T
> {
60 RefMut
::map(self.result
.borrow_mut(), |r
| {
61 r
.as_mut().unwrap().as_mut().expect("missing query result")
66 impl<T
> Default
for Query
<T
> {
67 fn default() -> Self {
68 Query { result: RefCell::new(None) }
72 pub struct Queries
<'tcx
> {
73 compiler
: &'tcx Compiler
,
74 gcx
: OnceCell
<GlobalCtxt
<'tcx
>>,
75 queries
: OnceCell
<TcxQueries
<'tcx
>>,
77 arena
: WorkerLocal
<Arena
<'tcx
>>,
78 hir_arena
: WorkerLocal
<rustc_ast_lowering
::Arena
<'tcx
>>,
80 dep_graph_future
: Query
<Option
<DepGraphFuture
>>,
81 parse
: Query
<ast
::Crate
>,
82 crate_name
: Query
<String
>,
83 register_plugins
: Query
<(ast
::Crate
, Lrc
<LintStore
>)>,
84 expansion
: Query
<(ast
::Crate
, Steal
<Rc
<RefCell
<BoxedResolver
>>>, Lrc
<LintStore
>)>,
85 dep_graph
: Query
<DepGraph
>,
86 lower_to_hir
: Query
<(&'tcx Crate
<'tcx
>, Steal
<ResolverOutputs
>)>,
87 prepare_outputs
: Query
<OutputFilenames
>,
88 global_ctxt
: Query
<QueryContext
<'tcx
>>,
89 ongoing_codegen
: Query
<Box
<dyn Any
>>,
92 impl<'tcx
> Queries
<'tcx
> {
93 pub fn new(compiler
: &'tcx Compiler
) -> Queries
<'tcx
> {
97 queries
: OnceCell
::new(),
98 arena
: WorkerLocal
::new(|_
| Arena
::default()),
99 hir_arena
: WorkerLocal
::new(|_
| rustc_ast_lowering
::Arena
::default()),
100 dep_graph_future
: Default
::default(),
101 parse
: Default
::default(),
102 crate_name
: Default
::default(),
103 register_plugins
: Default
::default(),
104 expansion
: Default
::default(),
105 dep_graph
: Default
::default(),
106 lower_to_hir
: Default
::default(),
107 prepare_outputs
: Default
::default(),
108 global_ctxt
: Default
::default(),
109 ongoing_codegen
: Default
::default(),
113 fn session(&self) -> &Lrc
<Session
> {
116 fn codegen_backend(&self) -> &Lrc
<Box
<dyn CodegenBackend
>> {
117 &self.compiler
.codegen_backend()
120 pub fn dep_graph_future(&self) -> Result
<&Query
<Option
<DepGraphFuture
>>> {
121 self.dep_graph_future
.compute(|| {
126 .then(|| rustc_incremental
::load_dep_graph(self.session())))
130 pub fn parse(&self) -> Result
<&Query
<ast
::Crate
>> {
131 self.parse
.compute(|| {
132 passes
::parse(self.session(), &self.compiler
.input
).map_err(|mut parse_error
| {
139 pub fn register_plugins(&self) -> Result
<&Query
<(ast
::Crate
, Lrc
<LintStore
>)>> {
140 self.register_plugins
.compute(|| {
141 let crate_name
= self.crate_name()?
.peek().clone();
142 let krate
= self.parse()?
.take();
144 let empty
: &(dyn Fn(&Session
, &mut LintStore
) + Sync
+ Send
) = &|_
, _
| {}
;
145 let result
= passes
::register_plugins(
147 &*self.codegen_backend().metadata_loader(),
148 self.compiler
.register_lints
.as_deref().unwrap_or_else(|| empty
),
153 // Compute the dependency graph (in the background). We want to do
154 // this as early as possible, to give the DepGraph maximum time to
155 // load before dep_graph() is called, but it also can't happen
156 // until after rustc_incremental::prepare_session_directory() is
157 // called, which happens within passes::register_plugins().
158 self.dep_graph_future().ok();
164 pub fn crate_name(&self) -> Result
<&Query
<String
>> {
165 self.crate_name
.compute(|| {
167 let parse_result
= self.parse()?
;
168 let krate
= parse_result
.peek();
169 // parse `#[crate_name]` even if `--crate-name` was passed, to make sure it matches.
170 find_crate_name(self.session(), &krate
.attrs
, &self.compiler
.input
)
177 ) -> Result
<&Query
<(ast
::Crate
, Steal
<Rc
<RefCell
<BoxedResolver
>>>, Lrc
<LintStore
>)>> {
178 tracing
::trace
!("expansion");
179 self.expansion
.compute(|| {
180 let crate_name
= self.crate_name()?
.peek().clone();
181 let (krate
, lint_store
) = self.register_plugins()?
.take();
182 let _timer
= self.session().timer("configure_and_expand");
183 passes
::configure_and_expand(
184 self.session().clone(),
186 self.codegen_backend().metadata_loader(),
190 .map(|(krate
, resolver
)| {
191 (krate
, Steal
::new(Rc
::new(RefCell
::new(resolver
))), lint_store
)
196 pub fn dep_graph(&self) -> Result
<&Query
<DepGraph
>> {
197 self.dep_graph
.compute(|| {
198 Ok(match self.dep_graph_future()?
.take() {
199 None
=> DepGraph
::new_disabled(),
201 let (prev_graph
, prev_work_products
) =
202 self.session().time("blocked_on_dep_graph_loading", || {
205 .unwrap_or_else(|e
| rustc_incremental
::LoadResult
::Error
{
206 message
: format
!("could not decode incremental cache: {:?}", e
),
208 .open(self.session())
211 rustc_incremental
::build_dep_graph(
216 .unwrap_or_else(DepGraph
::new_disabled
)
222 pub fn lower_to_hir(&'tcx
self) -> Result
<&Query
<(&'tcx Crate
<'tcx
>, Steal
<ResolverOutputs
>)>> {
223 self.lower_to_hir
.compute(|| {
224 let expansion_result
= self.expansion()?
;
225 let peeked
= expansion_result
.peek();
226 let krate
= &peeked
.0;
227 let resolver
= peeked
.1.steal();
228 let lint_store
= &peeked
.2;
229 let hir
= resolver
.borrow_mut().access(|resolver
| {
230 Ok(passes
::lower_to_hir(
234 &*self.dep_graph()?
.peek(),
239 let hir
= self.hir_arena
.alloc(hir
);
240 Ok((hir
, Steal
::new(BoxedResolver
::to_resolver_outputs(resolver
))))
244 pub fn prepare_outputs(&self) -> Result
<&Query
<OutputFilenames
>> {
245 self.prepare_outputs
.compute(|| {
246 let expansion_result
= self.expansion()?
;
247 let (krate
, boxed_resolver
, _
) = &*expansion_result
.peek();
248 let crate_name
= self.crate_name()?
.peek();
249 passes
::prepare_outputs(
259 pub fn global_ctxt(&'tcx
self) -> Result
<&Query
<QueryContext
<'tcx
>>> {
260 self.global_ctxt
.compute(|| {
261 let crate_name
= self.crate_name()?
.peek().clone();
262 let outputs
= self.prepare_outputs()?
.peek().clone();
263 let lint_store
= self.expansion()?
.peek().2.clone();
264 let hir
= self.lower_to_hir()?
.peek();
265 let dep_graph
= self.dep_graph()?
.peek().clone();
266 let (ref krate
, ref resolver_outputs
) = &*hir
;
267 let _timer
= self.session().timer("create_global_ctxt");
268 Ok(passes
::create_global_ctxt(
273 resolver_outputs
.steal(),
283 pub fn ongoing_codegen(&'tcx
self) -> Result
<&Query
<Box
<dyn Any
>>> {
284 self.ongoing_codegen
.compute(|| {
285 let outputs
= self.prepare_outputs()?
;
286 self.global_ctxt()?
.peek_mut().enter(|tcx
| {
287 tcx
.analysis(()).ok();
289 // Don't do code generation if there were any errors
290 self.session().compile_status()?
;
292 // Hook for UI tests.
293 Self::check_for_rustc_errors_attr(tcx
);
295 Ok(passes
::start_codegen(&***self.codegen_backend(), tcx
, &*outputs
.peek()))
300 /// Check for the `#[rustc_error]` annotation, which forces an error in codegen. This is used
301 /// to write UI tests that actually test that compilation succeeds without reporting
303 fn check_for_rustc_errors_attr(tcx
: TyCtxt
<'_
>) {
304 let def_id
= match tcx
.entry_fn(()) {
305 Some((def_id
, _
)) => def_id
,
309 let attrs
= &*tcx
.get_attrs(def_id
);
310 let attrs
= attrs
.iter().filter(|attr
| tcx
.sess
.check_name(attr
, sym
::rustc_error
));
312 match attr
.meta_item_list() {
313 // Check if there is a `#[rustc_error(delay_span_bug_from_inside_query)]`.
315 if list
.iter().any(|list_item
| {
317 list_item
.ident().map(|i
| i
.name
),
318 Some(sym
::delay_span_bug_from_inside_query
)
322 tcx
.ensure().trigger_delay_span_bug(def_id
);
325 // Bare `#[rustc_error]`.
328 tcx
.def_span(def_id
),
329 "fatal error triggered by #[rustc_error]",
333 // Some other attribute.
336 tcx
.def_span(def_id
),
337 "unexpected annotation used with `#[rustc_error(...)]!",
344 pub fn linker(&'tcx
self) -> Result
<Linker
> {
345 let sess
= self.session().clone();
346 let codegen_backend
= self.codegen_backend().clone();
348 let dep_graph
= self.dep_graph()?
.peek().clone();
349 let prepare_outputs
= self.prepare_outputs()?
.take();
350 let crate_hash
= self.global_ctxt()?
.peek_mut().enter(|tcx
| tcx
.crate_hash(LOCAL_CRATE
));
351 let ongoing_codegen
= self.ongoing_codegen()?
.take();
366 // compilation inputs
368 codegen_backend
: Lrc
<Box
<dyn CodegenBackend
>>,
370 // compilation outputs
372 prepare_outputs
: OutputFilenames
,
374 ongoing_codegen
: Box
<dyn Any
>,
378 pub fn link(self) -> Result
<()> {
379 let (codegen_results
, work_products
) =
380 self.codegen_backend
.join_codegen(self.ongoing_codegen
, &self.sess
)?
;
382 self.sess
.compile_status()?
;
384 let sess
= &self.sess
;
385 let dep_graph
= self.dep_graph
;
386 sess
.time("serialize_work_products", || {
387 rustc_incremental
::save_work_product_index(&sess
, &dep_graph
, work_products
)
390 let prof
= self.sess
.prof
.clone();
391 prof
.generic_activity("drop_dep_graph").run(move || drop(dep_graph
));
393 // Now that we won't touch anything in the incremental compilation directory
394 // any more, we can finalize it (which involves renaming it)
395 rustc_incremental
::finalize_session_directory(&self.sess
, self.crate_hash
);
402 .any(|&i
| i
== OutputType
::Exe
|| i
== OutputType
::Metadata
)
407 if sess
.opts
.debugging_opts
.no_link
{
408 // FIXME: use a binary format to encode the `.rlink` file
409 let rlink_data
= json
::encode(&codegen_results
).map_err(|err
| {
410 sess
.fatal(&format
!("failed to encode rlink: {}", err
));
412 let rlink_file
= self.prepare_outputs
.with_extension(config
::RLINK_EXT
);
413 std
::fs
::write(&rlink_file
, rlink_data
).map_err(|err
| {
414 sess
.fatal(&format
!("failed to write file {}: {}", rlink_file
.display(), err
));
419 let _timer
= sess
.prof
.verbose_generic_activity("link_crate");
420 self.codegen_backend
.link(&self.sess
, codegen_results
, &self.prepare_outputs
)
425 pub fn enter
<F
, T
>(&self, f
: F
) -> T
427 F
: for<'tcx
> FnOnce(&'tcx Queries
<'tcx
>) -> T
,
429 let mut _timer
= None
;
430 let queries
= Queries
::new(&self);
431 let ret
= f(&queries
);
433 // NOTE: intentionally does not compute the global context if it hasn't been built yet,
434 // since that likely means there was a parse error.
435 if let Some(Ok(gcx
)) = &mut *queries
.global_ctxt
.result
.borrow_mut() {
436 // We assume that no queries are run past here. If there are new queries
437 // after this point, they'll show up as "<unknown>" in self-profiling data.
440 queries
.session().prof
.generic_activity("self_profile_alloc_query_strings");
441 gcx
.enter(rustc_query_impl
::alloc_self_profile_query_strings
);
444 if self.session().opts
.debugging_opts
.query_stats
{
445 gcx
.enter(rustc_query_impl
::print_stats
);
449 .time("serialize_dep_graph", || gcx
.enter(rustc_incremental
::save_dep_graph
));
452 _timer
= Some(self.session().timer("free_global_ctxt"));