rustc_interface/
queries.rs

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1use std::any::Any;
2use std::sync::Arc;
3
4use rustc_codegen_ssa::CodegenResults;
5use rustc_codegen_ssa::traits::CodegenBackend;
6use rustc_data_structures::svh::Svh;
7use rustc_hir::def_id::LOCAL_CRATE;
8use rustc_middle::dep_graph::DepGraph;
9use rustc_middle::ty::TyCtxt;
10use rustc_session::Session;
11use rustc_session::config::{self, OutputFilenames, OutputType};
12
13use crate::errors::FailedWritingFile;
14use crate::passes;
15
16pub struct Linker {
17    dep_graph: DepGraph,
18    output_filenames: Arc<OutputFilenames>,
19    // Only present when incr. comp. is enabled.
20    crate_hash: Option<Svh>,
21    ongoing_codegen: Box<dyn Any>,
22}
23
24impl Linker {
25    pub fn codegen_and_build_linker(
26        tcx: TyCtxt<'_>,
27        codegen_backend: &dyn CodegenBackend,
28    ) -> Linker {
29        let ongoing_codegen = passes::start_codegen(codegen_backend, tcx);
30
31        Linker {
32            dep_graph: tcx.dep_graph.clone(),
33            output_filenames: Arc::clone(tcx.output_filenames(())),
34            crate_hash: if tcx.needs_crate_hash() {
35                Some(tcx.crate_hash(LOCAL_CRATE))
36            } else {
37                None
38            },
39            ongoing_codegen,
40        }
41    }
42
43    pub fn link(self, sess: &Session, codegen_backend: &dyn CodegenBackend) {
44        let (codegen_results, work_products) = sess.time("finish_ongoing_codegen", || {
45            codegen_backend.join_codegen(self.ongoing_codegen, sess, &self.output_filenames)
46        });
47
48        sess.dcx().abort_if_errors();
49
50        let _timer = sess.timer("link");
51
52        sess.time("serialize_work_products", || {
53            rustc_incremental::save_work_product_index(sess, &self.dep_graph, work_products)
54        });
55
56        let prof = sess.prof.clone();
57        prof.generic_activity("drop_dep_graph").run(move || drop(self.dep_graph));
58
59        // Now that we won't touch anything in the incremental compilation directory
60        // any more, we can finalize it (which involves renaming it)
61        rustc_incremental::finalize_session_directory(sess, self.crate_hash);
62
63        if !sess
64            .opts
65            .output_types
66            .keys()
67            .any(|&i| i == OutputType::Exe || i == OutputType::Metadata)
68        {
69            return;
70        }
71
72        if sess.opts.unstable_opts.no_link {
73            let rlink_file = self.output_filenames.with_extension(config::RLINK_EXT);
74            CodegenResults::serialize_rlink(
75                sess,
76                &rlink_file,
77                &codegen_results,
78                &*self.output_filenames,
79            )
80            .unwrap_or_else(|error| {
81                sess.dcx().emit_fatal(FailedWritingFile { path: &rlink_file, error })
82            });
83            return;
84        }
85
86        let _timer = sess.prof.verbose_generic_activity("link_crate");
87        codegen_backend.link(sess, codegen_results, &self.output_filenames)
88    }
89}
rustc_interface/queries.rs

rustc_interface/
queries.rs
