rustc_interface/
queries.rs

1use std::any::Any;
2use std::sync::Arc;
3
4use rustc_codegen_ssa::traits::CodegenBackend;
5use rustc_codegen_ssa::{CompiledModules, CrateInfo};
6use rustc_data_structures::svh::Svh;
7use rustc_errors::timings::TimingSection;
8use rustc_hir::def_id::LOCAL_CRATE;
9use rustc_metadata::EncodedMetadata;
10use rustc_middle::dep_graph::{DepGraph, WorkProductMap};
11use rustc_middle::ty::TyCtxt;
12use rustc_session::config::{self, OutputFilenames, OutputType};
13use rustc_session::{IncrCompSession, Session};
14
15use crate::diagnostics::FailedWritingFile;
16use crate::passes;
17
18pub struct Linker {
19    dep_graph: DepGraph,
20    output_filenames: Arc<OutputFilenames>,
21    // Only present when incr. comp. is enabled.
22    crate_hash: Option<Svh>,
23    crate_info: CrateInfo,
24    metadata: EncodedMetadata,
25    ongoing_codegen: Box<dyn Any>,
26}
27
28impl Linker {
29    pub fn codegen_and_build_linker(
30        tcx: TyCtxt<'_>,
31        codegen_backend: &dyn CodegenBackend,
32    ) -> Linker {
33        let (ongoing_codegen, crate_info, metadata) = passes::start_codegen(codegen_backend, tcx);
34
35        Linker {
36            dep_graph: tcx.dep_graph.clone(),
37            output_filenames: Arc::clone(tcx.output_filenames(())),
38            crate_hash: if tcx.sess.opts.incremental.is_some() {
39                Some(tcx.crate_hash(LOCAL_CRATE))
40            } else {
41                None
42            },
43            crate_info,
44            metadata,
45            ongoing_codegen,
46        }
47    }
48
49    pub fn link(
50        self,
51        sess: &Session,
52        incr_comp_session: Option<IncrCompSession>,
53        codegen_backend: &dyn CodegenBackend,
54    ) {
55        let (compiled_modules, mut work_products) = sess.time("finish_ongoing_codegen", || {
56            match self.ongoing_codegen.downcast::<CompiledModules>() {
57                // This was a check only build
58                Ok(compiled_modules) => (*compiled_modules, WorkProductMap::default()),
59
60                Err(ongoing_codegen) => codegen_backend.join_codegen(
61                    ongoing_codegen,
62                    sess,
63                    incr_comp_session.as_ref(),
64                    &self.output_filenames,
65                    &self.crate_info,
66                ),
67            }
68        });
69
70        if sess.codegen_units().as_usize() == 1 && sess.opts.unstable_opts.time_llvm_passes {
71            codegen_backend.print_pass_timings()
72        }
73
74        if sess.print_llvm_stats() {
75            codegen_backend.print_statistics()
76        }
77
78        if let Some(out_path) = sess.print_llvm_stats_json() {
79            let llvm_stats_json = codegen_backend.print_statistics_json();
80
81            if !llvm_stats_json.is_empty() {
82                if let Err(e) = std::fs::write(&out_path, llvm_stats_json) {
83                    sess.dcx().err(::alloc::__export::must_use({
        ::alloc::fmt::format(format_args!("failed to write stats to {0}: {1}",
                out_path, e))
    })format!("failed to write stats to {}: {}", out_path, e));
84                }
85            } else {
86                sess.dcx().warn(::alloc::__export::must_use({
        ::alloc::fmt::format(format_args!("requested to print LLVM statistics to JSON file {0}, but the codegen backend did not provide any statistics",
                out_path))
    })format!(
87                    "requested to print LLVM statistics to JSON file {}, but the codegen backend \
88                    did not provide any statistics",
89                    out_path,
90                ));
91            }
92        }
93
94        sess.timings.end_section(sess.dcx(), TimingSection::Codegen);
95
96        if sess.opts.incremental.is_some()
97            && let Some(path) = self.metadata.path()
98        {
99            let (id, product) = rustc_incremental::copy_cgu_workproduct_to_incr_comp_cache_dir(
100                sess,
101                incr_comp_session.as_ref().unwrap(),
102                "metadata",
103                &[("rmeta", path)],
104                &[],
105            );
106            work_products.insert(id, product);
107        }
108
109        if let Some(guar) = sess.dcx().has_errors_or_delayed_bugs() {
110            guar.raise_fatal();
111        }
112
113        let _timer = sess.timer("link");
114
115        sess.time("serialize_work_products", || {
116            rustc_incremental::save_work_product_index(
117                sess,
118                incr_comp_session.as_ref(),
119                &self.dep_graph,
120                work_products,
121            )
122        });
123
124        let prof = sess.prof.clone();
125        prof.generic_activity("drop_dep_graph").run(move || drop(self.dep_graph));
126
127        // Now that we won't touch anything in the incremental compilation directory
128        // any more, we can finalize it (which involves renaming it)
129        rustc_incremental::finalize_session_directory(sess, incr_comp_session, self.crate_hash);
130
131        if !sess
132            .opts
133            .output_types
134            .keys()
135            .any(|&i| i == OutputType::Exe || i == OutputType::Metadata)
136        {
137            return;
138        }
139
140        if sess.opts.unstable_opts.no_link {
141            let rlink_file = self.output_filenames.with_extension(config::RLINK_EXT);
142            CompiledModules::serialize_rlink(
143                sess,
144                &rlink_file,
145                &compiled_modules,
146                &self.crate_info,
147                &self.metadata,
148                &self.output_filenames,
149            )
150            .unwrap_or_else(|error| {
151                sess.dcx().emit_fatal(FailedWritingFile { path: &rlink_file, error })
152            });
153            return;
154        }
155
156        let _timer = sess.prof.verbose_generic_activity("link_crate");
157        let _timing = sess.timings.section_guard(sess.dcx(), TimingSection::Linking);
158        codegen_backend.link(
159            sess,
160            compiled_modules,
161            self.crate_info,
162            self.metadata,
163            &self.output_filenames,
164        )
165    }
166}
rustc_interface/queries.rs

rustc_interface/
queries.rs
