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Auto merge of #85284 - eggyal:custom-profiler-runtime, r=jackh726

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Provide option for specifying the profiler runtime

Currently, if `-Zinstrument-coverage` is enabled, the target is linked
against the `library/profiler_builtins` crate (which pulls in LLVM's
compiler-rt runtime).

This option enables backends to specify an alternative runtime crate for
handling injected instrumentation calls.
This commit is contained in:
bors 2021-06-18 04:39:01 +00:00
commit ed33787335
4 changed files with 28 additions and 22 deletions
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2
compiler/rustc_interface/src/tests.rs
View file

@ -715,7 +715,6 @@ fn test_debugging_options_tracking_hash() {
tracked!(no_codegen, true);
tracked!(no_generate_arange_section, true);
tracked!(no_link, true);
tracked!(no_profiler_runtime, true);
tracked!(osx_rpath_install_name, true);
tracked!(panic_abort_tests, true);
tracked!(plt, Some(true));
@ -724,6 +723,7 @@ fn test_debugging_options_tracking_hash() {
tracked!(print_fuel, Some("abc".to_string()));
tracked!(profile, true);
tracked!(profile_emit, Some(PathBuf::from("abc")));
tracked!(profiler_runtime, None);
tracked!(relax_elf_relocations, Some(true));
tracked!(relro_level, Some(RelroLevel::Full));
tracked!(simulate_remapped_rust_src_base, Some(PathBuf::from("/rustc/abc")));

40
compiler/rustc_metadata/src/creader.rs
View file

@ -769,28 +769,32 @@ impl<'a> CrateLoader<'a> {
}
fn inject_profiler_runtime(&mut self, krate: &ast::Crate) {
if (self.sess.instrument_coverage()
|| self.sess.opts.debugging_opts.profile
|| self.sess.opts.cg.profile_generate.enabled())
&& !self.sess.opts.debugging_opts.no_profiler_runtime
let profiler_runtime = &self.sess.opts.debugging_opts.profiler_runtime;
if !(profiler_runtime.is_some()
&& (self.sess.instrument_coverage()
|| self.sess.opts.debugging_opts.profile
|| self.sess.opts.cg.profile_generate.enabled()))
{
info!("loading profiler");
return;
}
if self.sess.contains_name(&krate.attrs, sym::no_core) {
self.sess.err(
"`profiler_builtins` crate (required by compiler options) \
is not compatible with crate attribute `#![no_core]`",
);
}
info!("loading profiler");
let name = sym::profiler_builtins;
let cnum = self.resolve_crate(name, DUMMY_SP, CrateDepKind::Implicit, None);
let data = self.cstore.get_crate_data(cnum);
let name = Symbol::intern(profiler_runtime.as_ref().unwrap());
if name == sym::profiler_builtins && self.sess.contains_name(&krate.attrs, sym::no_core) {
self.sess.err(
"`profiler_builtins` crate (required by compiler options) \
is not compatible with crate attribute `#![no_core]`",
);
}
// Sanity check the loaded crate to ensure it is indeed a profiler runtime
if !data.is_profiler_runtime() {
self.sess.err("the crate `profiler_builtins` is not a profiler runtime");
}
let cnum = self.resolve_crate(name, DUMMY_SP, CrateDepKind::Implicit, None);
let data = self.cstore.get_crate_data(cnum);
// Sanity check the loaded crate to ensure it is indeed a profiler runtime
if !data.is_profiler_runtime() {
self.sess.err(&format!("the crate `{}` is not a profiler runtime", name));
}
}

4
compiler/rustc_metadata/src/locator.rs
View file

@ -1100,7 +1100,9 @@ impl CrateError {
if sess.is_nightly_build() && std::env::var("CARGO").is_ok() {
err.help("consider building the standard library from source with `cargo build -Zbuild-std`");
}
} else if crate_name == sym::profiler_builtins {
} else if Some(crate_name)
== sess.opts.debugging_opts.profiler_runtime.as_deref().map(Symbol::intern)
{
err.note(&"the compiler may have been built without the profiler runtime");
}
err.span_label(span, "can't find crate");

4
compiler/rustc_session/src/options.rs
View file

@ -1160,8 +1160,6 @@ options! {
"compile without linking"),
no_parallel_llvm: bool = (false, parse_no_flag, [UNTRACKED],
"run LLVM in non-parallel mode (while keeping codegen-units and ThinLTO)"),
no_profiler_runtime: bool = (false, parse_no_flag, [TRACKED],
"prevent automatic injection of the profiler_builtins crate"),
normalize_docs: bool = (false, parse_bool, [TRACKED],
"normalize associated items in rustdoc when generating documentation"),
osx_rpath_install_name: bool = (false, parse_bool, [TRACKED],
@ -1205,6 +1203,8 @@ options! {
profile_emit: Option<PathBuf> = (None, parse_opt_pathbuf, [TRACKED],
"file path to emit profiling data at runtime when using 'profile' \
(default based on relative source path)"),
profiler_runtime: Option<String> = (Some(String::from("profiler_builtins")), parse_opt_string, [TRACKED],
"name of the profiler runtime crate to automatically inject, or None to disable"),
query_dep_graph: bool = (false, parse_bool, [UNTRACKED],
"enable queries of the dependency graph for regression testing (default: no)"),
query_stats: bool = (false, parse_bool, [UNTRACKED],