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Fix O(tests) stack usage in edition 2024 mergeable doctests #138281

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Merged
merged 1 commit into from
Mar 10, 2025
Merged

Fix O(tests) stack usage in edition 2024 mergeable doctests #138281

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19 changes: 10 additions & 9 deletions src/librustdoc/doctest/runner.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -45,11 +45,8 @@ impl DocTestRunner {
self.crate_attrs.insert(line.to_string());
}
}
if !self.ids.is_empty() {
self.ids.push(',');
}
self.ids.push_str(&format!(
"{}::TEST",
"tests.push({}::TEST);\n",
generate_mergeable_doctest(
doctest,
scraped_test,
Expand Down Expand Up @@ -136,19 +133,23 @@ mod __doctest_mod {{

#[rustc_main]
fn main() -> std::process::ExitCode {{
const TESTS: [test::TestDescAndFn; {nb_tests}] = [{ids}];
let tests = {{
let mut tests = Vec::with_capacity({nb_tests});
{ids}
tests
}};
let test_marker = std::ffi::OsStr::new(__doctest_mod::RUN_OPTION);
let test_args = &[{test_args}];
const ENV_BIN: &'static str = \"RUSTDOC_DOCTEST_BIN_PATH\";

if let Ok(binary) = std::env::var(ENV_BIN) {{
let _ = crate::__doctest_mod::BINARY_PATH.set(binary.into());
unsafe {{ std::env::remove_var(ENV_BIN); }}
return std::process::Termination::report(test::test_main(test_args, Vec::from(TESTS), None));
return std::process::Termination::report(test::test_main(test_args, tests, None));
}} else if let Ok(nb_test) = std::env::var(__doctest_mod::RUN_OPTION) {{
if let Ok(nb_test) = nb_test.parse::<usize>() {{
if let Some(test) = TESTS.get(nb_test) {{
if let test::StaticTestFn(f) = test.testfn {{
if let Some(test) = tests.get(nb_test) {{
if let test::StaticTestFn(f) = &test.testfn {{
return std::process::Termination::report(f());
}}
}}
Expand All @@ -158,7 +159,7 @@ if let Ok(binary) = std::env::var(ENV_BIN) {{

eprintln!(\"WARNING: No rustdoc doctest environment variable provided so doctests will be run in \
the same process\");
std::process::Termination::report(test::test_main(test_args, Vec::from(TESTS), None))
std::process::Termination::report(test::test_main(test_args, tests, None))
}}",
nb_tests = self.nb_tests,
output = self.output,
Expand Down
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