Rollup merge of #142784 - Kobzol:timings-codegen, r=nnethercote

Add codegen timing section

And since we now start and end the sections also using separate functions, also add some light checking if we're generating the sections correctly.

I'm integrating `--timings` into Cargo, and I realized that the codegen timings would be quite useful for that. Frontend can be computed simply as `[start of compilation, start of codegen]` for now.

r? `@nnethercote`

1 files changed, 2 insertions, 1 deletions

diff --git a/compiler/rustc_interface/src/queries.rs b/compiler/rustc_interface/src/queries.rs
index 877440ec7d2..2bc30fa7cb0 100644
--- a/compiler/rustc_interface/src/queries.rs
+++ b/compiler/rustc_interface/src/queries.rs
@@ -48,6 +48,7 @@ impl Linker {
         let (codegen_results, work_products) = sess.time("finish_ongoing_codegen", || {
             codegen_backend.join_codegen(self.ongoing_codegen, sess, &self.output_filenames)
         });
+        sess.timings.end_section(sess.dcx(), TimingSection::Codegen);
 
         sess.dcx().abort_if_errors();
 
@@ -89,7 +90,7 @@ impl Linker {
         }
 
         let _timer = sess.prof.verbose_generic_activity("link_crate");
-        let _timing = sess.timings.start_section(sess.dcx(), TimingSection::Linking);
+        let _timing = sess.timings.section_guard(sess.dcx(), TimingSection::Linking);
         codegen_backend.link(sess, codegen_results, self.metadata, &self.output_filenames)
     }
 }