]> git.lizzy.rs Git - rust.git/blob - compiler/rustc_interface/src/interface.rs
Rollup merge of #89876 - AlexApps99:const_ops, r=oli-obk
[rust.git] / compiler / rustc_interface / src / interface.rs
1 pub use crate::passes::BoxedResolver;
2 use crate::util;
3
4 use rustc_ast::token;
5 use rustc_ast::{self as ast, MetaItemKind};
6 use rustc_codegen_ssa::traits::CodegenBackend;
7 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
8 use rustc_data_structures::sync::Lrc;
9 use rustc_data_structures::OnDrop;
10 use rustc_errors::registry::Registry;
11 use rustc_errors::{ErrorReported, Handler};
12 use rustc_lint::LintStore;
13 use rustc_middle::ty;
14 use rustc_parse::new_parser_from_source_str;
15 use rustc_query_impl::QueryCtxt;
16 use rustc_session::config::{self, ErrorOutputType, Input, OutputFilenames};
17 use rustc_session::early_error;
18 use rustc_session::lint;
19 use rustc_session::parse::{CrateConfig, ParseSess};
20 use rustc_session::{DiagnosticOutput, Session};
21 use rustc_span::source_map::{FileLoader, FileName};
22 use std::path::PathBuf;
23 use std::result;
24 use std::sync::{Arc, Mutex};
25
26 pub type Result<T> = result::Result<T, ErrorReported>;
27
28 /// Represents a compiler session.
29 ///
30 /// Can be used to run `rustc_interface` queries.
31 /// Created by passing [`Config`] to [`run_compiler`].
32 pub struct Compiler {
33     pub(crate) sess: Lrc<Session>,
34     codegen_backend: Lrc<Box<dyn CodegenBackend>>,
35     pub(crate) input: Input,
36     pub(crate) input_path: Option<PathBuf>,
37     pub(crate) output_dir: Option<PathBuf>,
38     pub(crate) output_file: Option<PathBuf>,
39     pub(crate) register_lints: Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>>,
40     pub(crate) override_queries:
41         Option<fn(&Session, &mut ty::query::Providers, &mut ty::query::ExternProviders)>,
42 }
43
44 impl Compiler {
45     pub fn session(&self) -> &Lrc<Session> {
46         &self.sess
47     }
48     pub fn codegen_backend(&self) -> &Lrc<Box<dyn CodegenBackend>> {
49         &self.codegen_backend
50     }
51     pub fn input(&self) -> &Input {
52         &self.input
53     }
54     pub fn output_dir(&self) -> &Option<PathBuf> {
55         &self.output_dir
56     }
57     pub fn output_file(&self) -> &Option<PathBuf> {
58         &self.output_file
59     }
60     pub fn register_lints(&self) -> &Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>> {
61         &self.register_lints
62     }
63     pub fn build_output_filenames(
64         &self,
65         sess: &Session,
66         attrs: &[ast::Attribute],
67     ) -> OutputFilenames {
68         util::build_output_filenames(&self.input, &self.output_dir, &self.output_file, attrs, sess)
69     }
70 }
71
72 /// Converts strings provided as `--cfg [cfgspec]` into a `crate_cfg`.
73 pub fn parse_cfgspecs(cfgspecs: Vec<String>) -> FxHashSet<(String, Option<String>)> {
74     rustc_span::create_default_session_if_not_set_then(move |_| {
75         let cfg = cfgspecs
76             .into_iter()
77             .map(|s| {
78                 let sess = ParseSess::with_silent_emitter(Some(format!(
79                     "this error occurred on the command line: `--cfg={}`",
80                     s
81                 )));
82                 let filename = FileName::cfg_spec_source_code(&s);
83                 let mut parser = new_parser_from_source_str(&sess, filename, s.to_string());
84
85                 macro_rules! error {
86                     ($reason: expr) => {
87                         early_error(
88                             ErrorOutputType::default(),
89                             &format!(concat!("invalid `--cfg` argument: `{}` (", $reason, ")"), s),
90                         );
91                     };
92                 }
93
94                 match &mut parser.parse_meta_item() {
95                     Ok(meta_item) if parser.token == token::Eof => {
96                         if meta_item.path.segments.len() != 1 {
97                             error!("argument key must be an identifier");
98                         }
99                         match &meta_item.kind {
100                             MetaItemKind::List(..) => {
101                                 error!(r#"expected `key` or `key="value"`"#);
102                             }
103                             MetaItemKind::NameValue(lit) if !lit.kind.is_str() => {
104                                 error!("argument value must be a string");
105                             }
106                             MetaItemKind::NameValue(..) | MetaItemKind::Word => {
107                                 let ident = meta_item.ident().expect("multi-segment cfg key");
108                                 return (ident.name, meta_item.value_str());
109                             }
110                         }
111                     }
112                     Ok(..) => {}
113                     Err(err) => err.cancel(),
114                 }
115
116                 error!(r#"expected `key` or `key="value"`"#);
117             })
118             .collect::<CrateConfig>();
119         cfg.into_iter().map(|(a, b)| (a.to_string(), b.map(|b| b.to_string()))).collect()
120     })
121 }
122
123 /// The compiler configuration
124 pub struct Config {
125     /// Command line options
126     pub opts: config::Options,
127
128     /// cfg! configuration in addition to the default ones
129     pub crate_cfg: FxHashSet<(String, Option<String>)>,
130
131     pub input: Input,
132     pub input_path: Option<PathBuf>,
133     pub output_dir: Option<PathBuf>,
134     pub output_file: Option<PathBuf>,
135     pub file_loader: Option<Box<dyn FileLoader + Send + Sync>>,
136     pub diagnostic_output: DiagnosticOutput,
137
138     /// Set to capture stderr output during compiler execution
139     pub stderr: Option<Arc<Mutex<Vec<u8>>>>,
140
141     pub lint_caps: FxHashMap<lint::LintId, lint::Level>,
142
143     /// This is a callback from the driver that is called when [`ParseSess`] is created.
144     pub parse_sess_created: Option<Box<dyn FnOnce(&mut ParseSess) + Send>>,
145
146     /// This is a callback from the driver that is called when we're registering lints;
147     /// it is called during plugin registration when we have the LintStore in a non-shared state.
148     ///
149     /// Note that if you find a Some here you probably want to call that function in the new
150     /// function being registered.
151     pub register_lints: Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>>,
152
153     /// This is a callback from the driver that is called just after we have populated
154     /// the list of queries.
155     ///
156     /// The second parameter is local providers and the third parameter is external providers.
157     pub override_queries:
158         Option<fn(&Session, &mut ty::query::Providers, &mut ty::query::ExternProviders)>,
159
160     /// This is a callback from the driver that is called to create a codegen backend.
161     pub make_codegen_backend:
162         Option<Box<dyn FnOnce(&config::Options) -> Box<dyn CodegenBackend> + Send>>,
163
164     /// Registry of diagnostics codes.
165     pub registry: Registry,
166 }
167
168 pub fn create_compiler_and_run<R>(config: Config, f: impl FnOnce(&Compiler) -> R) -> R {
169     let registry = &config.registry;
170     let (mut sess, codegen_backend) = util::create_session(
171         config.opts,
172         config.crate_cfg,
173         config.diagnostic_output,
174         config.file_loader,
175         config.input_path.clone(),
176         config.lint_caps,
177         config.make_codegen_backend,
178         registry.clone(),
179     );
180
181     if let Some(parse_sess_created) = config.parse_sess_created {
182         parse_sess_created(
183             &mut Lrc::get_mut(&mut sess)
184                 .expect("create_session() should never share the returned session")
185                 .parse_sess,
186         );
187     }
188
189     let compiler = Compiler {
190         sess,
191         codegen_backend,
192         input: config.input,
193         input_path: config.input_path,
194         output_dir: config.output_dir,
195         output_file: config.output_file,
196         register_lints: config.register_lints,
197         override_queries: config.override_queries,
198     };
199
200     rustc_span::with_source_map(compiler.sess.parse_sess.clone_source_map(), move || {
201         let r = {
202             let _sess_abort_error = OnDrop(|| {
203                 compiler.sess.finish_diagnostics(registry);
204             });
205
206             f(&compiler)
207         };
208
209         let prof = compiler.sess.prof.clone();
210         prof.generic_activity("drop_compiler").run(move || drop(compiler));
211         r
212     })
213 }
214
215 pub fn run_compiler<R: Send>(mut config: Config, f: impl FnOnce(&Compiler) -> R + Send) -> R {
216     tracing::trace!("run_compiler");
217     let stderr = config.stderr.take();
218     util::setup_callbacks_and_run_in_thread_pool_with_globals(
219         config.opts.edition,
220         config.opts.debugging_opts.threads,
221         &stderr,
222         || create_compiler_and_run(config, f),
223     )
224 }
225
226 pub fn try_print_query_stack(handler: &Handler, num_frames: Option<usize>) {
227     eprintln!("query stack during panic:");
228
229     // Be careful relying on global state here: this code is called from
230     // a panic hook, which means that the global `Handler` may be in a weird
231     // state if it was responsible for triggering the panic.
232     let i = ty::tls::with_context_opt(|icx| {
233         if let Some(icx) = icx {
234             QueryCtxt::from_tcx(icx.tcx).try_print_query_stack(icx.query, handler, num_frames)
235         } else {
236             0
237         }
238     });
239
240     if num_frames == None || num_frames >= Some(i) {
241         eprintln!("end of query stack");
242     } else {
243         eprintln!("we're just showing a limited slice of the query stack");
244     }
245 }