73 lines
3.2 KiB
Rust
73 lines
3.2 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
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//! Test builder for `rustdoc`-generated tests.
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//!
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//! This script is a hack to extract the test from `rustdoc`'s output. Ideally, `rustdoc` would
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//! have an option to generate this information instead, e.g. as JSON output.
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//!
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//! The `rustdoc`-generated test names look like `{file}_{line}_{number}`, e.g.
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//! `...path_rust_kernel_sync_arc_rs_42_0`. `number` is the "test number", needed in cases like
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//! a macro that expands into items with doctests is invoked several times within the same line.
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//!
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//! However, since these names are used for bisection in CI, the line number makes it not stable
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//! at all. In the future, we would like `rustdoc` to give us the Rust item path associated with
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//! the test, plus a "test number" (for cases with several examples per item) and generate a name
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//! from that. For the moment, we generate ourselves a new name, `{file}_{number}` instead, in
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//! the `gen` script (done there since we need to be aware of all the tests in a given file).
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use std::io::Read;
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fn main() {
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let mut stdin = std::io::stdin().lock();
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let mut body = String::new();
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stdin.read_to_string(&mut body).unwrap();
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// Find the generated function name looking for the inner function inside `main()`.
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//
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// The line we are looking for looks like one of the following:
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//
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// ```
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// fn main() { #[allow(non_snake_case)] fn _doctest_main_rust_kernel_file_rs_28_0() {
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// fn main() { #[allow(non_snake_case)] fn _doctest_main_rust_kernel_file_rs_37_0() -> Result<(), impl core::fmt::Debug> {
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// ```
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//
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// It should be unlikely that doctest code matches such lines (when code is formatted properly).
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let rustdoc_function_name = body
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.lines()
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.find_map(|line| {
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Some(
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line.split_once("fn main() {")?
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.1
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.split_once("fn ")?
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.1
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.split_once("()")?
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.0,
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)
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.filter(|x| x.chars().all(|c| c.is_alphanumeric() || c == '_'))
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})
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.expect("No test function found in `rustdoc`'s output.");
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// Qualify `Result` to avoid the collision with our own `Result` coming from the prelude.
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let body = body.replace(
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&format!("{rustdoc_function_name}() -> Result<(), impl core::fmt::Debug> {{"),
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&format!("{rustdoc_function_name}() -> core::result::Result<(), impl core::fmt::Debug> {{"),
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);
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// For tests that get generated with `Result`, like above, `rustdoc` generates an `unwrap()` on
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// the return value to check there were no returned errors. Instead, we use our assert macro
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// since we want to just fail the test, not panic the kernel.
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//
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// We save the result in a variable so that the failed assertion message looks nicer.
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let body = body.replace(
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&format!("}} {rustdoc_function_name}().unwrap() }}"),
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&format!("}} let test_return_value = {rustdoc_function_name}(); assert!(test_return_value.is_ok()); }}"),
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);
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// Figure out a smaller test name based on the generated function name.
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let name = rustdoc_function_name.split_once("_rust_kernel_").unwrap().1;
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let path = format!("rust/test/doctests/kernel/{name}");
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std::fs::write(path, body.as_bytes()).unwrap();
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}
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