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Add self-profile events for target-machine creation

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These code paths are surprisingly hot in the `large-workspace` benchmark; it
would be handy to see some detailed timings and execution counts.
This commit is contained in:
Zalathar 2025-09-21 20:50:44 +10:00
parent dfa22235d8
commit b17fb70d04
1 changed files with 10 additions and 0 deletions
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10
compiler/rustc_codegen_llvm/src/back/write.rs
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@ -204,6 +204,9 @@ pub(crate) fn target_machine_factory(
optlvl: config::OptLevel,
target_features: &[String],
) -> TargetMachineFactoryFn<LlvmCodegenBackend> {
// Self-profile timer for creating a _factory_.
let _prof_timer = sess.prof.generic_activity("target_machine_factory");
let reloc_model = to_llvm_relocation_model(sess.relocation_model());
let (opt_level, _) = to_llvm_opt_settings(optlvl);
@ -259,6 +262,9 @@ pub(crate) fn target_machine_factory(
.into_string()
.unwrap_or_default();
let command_line_args = quote_command_line_args(&sess.expanded_args);
// Self-profile counter for the number of bytes produced by command-line quoting.
// Values are summed, so the summary result is cumulative across all TM factories.
sess.prof.artifact_size("quoted_command_line_args", "-", command_line_args.len() as u64);
let debuginfo_compression = sess.opts.debuginfo_compression.to_string();
match sess.opts.debuginfo_compression {
@ -281,7 +287,11 @@ pub(crate) fn target_machine_factory(
let use_wasm_eh = wants_wasm_eh(sess);
let prof = SelfProfilerRef::clone(&sess.prof);
Arc::new(move |config: TargetMachineFactoryConfig| {
// Self-profile timer for invoking a factory to create a target machine.
let _prof_timer = prof.generic_activity("target_machine_factory_inner");
let path_to_cstring_helper = |path: Option<PathBuf>| -> CString {
let path = path.unwrap_or_default();
let path = path_mapping