444 lines
15 KiB
Rust
444 lines
15 KiB
Rust
//use std::env;
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fn main() {
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println!("cargo:rerun-if-changed=build.rs");
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#[cfg(feature = "musl-reference-tests")]
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musl_reference_tests::generate();
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//if !cfg!(feature = "checked") {
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// let lvl = env::var("OPT_LEVEL").unwrap();
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// if lvl != "0" {
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// println!("cargo:rustc-cfg=assert_no_panic");
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// }
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//}
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}
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#[cfg(feature = "musl-reference-tests")]
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mod musl_reference_tests {
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use std::process::Command;
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use std::{env, fs};
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use rand::Rng;
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use rand::seq::SliceRandom;
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// Number of tests to generate for each function
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const NTESTS: usize = 500;
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// These files are all internal functions or otherwise miscellaneous, not
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// defining a function we want to test.
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const IGNORED_FILES: &[&str] = &[
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"fenv.rs",
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// These are giving slightly different results compared to musl
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"lgamma.rs",
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"lgammaf.rs",
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"tgamma.rs",
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"j0.rs",
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"j0f.rs",
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"jn.rs",
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"jnf.rs",
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"j1.rs",
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"j1f.rs",
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];
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struct Function {
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name: String,
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args: Vec<Ty>,
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ret: Vec<Ty>,
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tests: Vec<Test>,
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}
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enum Ty {
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F32,
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F64,
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I32,
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Bool,
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}
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struct Test {
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inputs: Vec<i64>,
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outputs: Vec<i64>,
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}
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pub fn generate() {
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// PowerPC tests are failing on LLVM 13: https://github.com/rust-lang/rust/issues/88520
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let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
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if target_arch == "powerpc64" {
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return;
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}
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let files =
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fs::read_dir("src/math").unwrap().map(|f| f.unwrap().path()).collect::<Vec<_>>();
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let mut math = Vec::new();
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for file in files {
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if IGNORED_FILES.iter().any(|f| file.ends_with(f)) {
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continue;
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}
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println!("generating musl reference tests in {:?}", file);
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let contents = fs::read_to_string(file).unwrap();
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let mut functions = contents.lines().filter(|f| f.starts_with("pub fn"));
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while let Some(function_to_test) = functions.next() {
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math.push(parse(function_to_test));
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}
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}
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// Generate a bunch of random inputs for each function. This will
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// attempt to generate a good set of uniform test cases for exercising
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// all the various functionality.
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generate_random_tests(&mut math, &mut rand::thread_rng());
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// After we have all our inputs, use the x86_64-unknown-linux-musl
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// target to generate the expected output.
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generate_test_outputs(&mut math);
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//panic!("Boo");
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// ... and now that we have both inputs and expected outputs, do a bunch
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// of codegen to create the unit tests which we'll actually execute.
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generate_unit_tests(&math);
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}
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/// A "poor man's" parser for the signature of a function
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fn parse(s: &str) -> Function {
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let s = eat(s, "pub fn ");
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let pos = s.find('(').unwrap();
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let name = &s[..pos];
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let s = &s[pos + 1..];
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let end = s.find(')').unwrap();
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let args = s[..end]
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.split(',')
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.map(|arg| {
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let colon = arg.find(':').unwrap();
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parse_ty(arg[colon + 1..].trim())
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})
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.collect::<Vec<_>>();
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let tail = &s[end + 1..];
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let tail = eat(tail, " -> ");
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let ret = parse_retty(tail.replace("{", "").trim());
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return Function { name: name.to_string(), args, ret, tests: Vec::new() };
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fn parse_ty(s: &str) -> Ty {
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match s {
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"f32" => Ty::F32,
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"f64" => Ty::F64,
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"i32" => Ty::I32,
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"bool" => Ty::Bool,
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other => panic!("unknown type `{}`", other),
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}
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}
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fn parse_retty(s: &str) -> Vec<Ty> {
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match s {
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"(f32, f32)" => vec![Ty::F32, Ty::F32],
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"(f32, i32)" => vec![Ty::F32, Ty::I32],
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"(f64, f64)" => vec![Ty::F64, Ty::F64],
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"(f64, i32)" => vec![Ty::F64, Ty::I32],
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other => vec![parse_ty(other)],
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}
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}
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fn eat<'a>(s: &'a str, prefix: &str) -> &'a str {
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if s.starts_with(prefix) {
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&s[prefix.len()..]
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} else {
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panic!("{:?} didn't start with {:?}", s, prefix)
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}
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}
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}
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fn generate_random_tests<R: Rng>(functions: &mut [Function], rng: &mut R) {
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for function in functions {
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for _ in 0..NTESTS {
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function.tests.push(generate_test(function, rng));
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}
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}
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fn generate_test<R: Rng>(function: &Function, rng: &mut R) -> Test {
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let mut inputs = function.args.iter().map(|ty| ty.gen_i64(rng)).collect::<Vec<_>>();
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// First argument to this function appears to be a number of
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// iterations, so passing in massive random numbers causes it to
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// take forever to execute, so make sure we're not running random
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// math code until the heat death of the universe.
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if function.name == "jn" || function.name == "jnf" {
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inputs[0] &= 0xffff;
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}
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Test {
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inputs,
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// zero output for now since we'll generate it later
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outputs: vec![],
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}
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}
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}
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impl Ty {
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fn gen_i64<R: Rng>(&self, r: &mut R) -> i64 {
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use std::{f32, f64};
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return match self {
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Ty::F32 => {
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if r.gen_range(0, 20) < 1 {
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let i = *[f32::NAN, f32::INFINITY, f32::NEG_INFINITY].choose(r).unwrap();
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i.to_bits().into()
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} else {
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r.gen::<f32>().to_bits().into()
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}
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}
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Ty::F64 => {
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if r.gen_range(0, 20) < 1 {
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let i = *[f64::NAN, f64::INFINITY, f64::NEG_INFINITY].choose(r).unwrap();
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i.to_bits() as i64
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} else {
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r.gen::<f64>().to_bits() as i64
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}
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}
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Ty::I32 => {
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if r.gen_range(0, 10) < 1 {
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let i = *[i32::max_value(), 0, i32::min_value()].choose(r).unwrap();
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i.into()
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} else {
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r.gen::<i32>().into()
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}
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}
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Ty::Bool => r.gen::<bool>() as i64,
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};
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}
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fn libc_ty(&self) -> &'static str {
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match self {
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Ty::F32 => "f32",
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Ty::F64 => "f64",
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Ty::I32 => "i32",
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Ty::Bool => "i32",
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}
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}
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fn libc_pty(&self) -> &'static str {
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match self {
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Ty::F32 => "*mut f32",
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Ty::F64 => "*mut f64",
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Ty::I32 => "*mut i32",
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Ty::Bool => "*mut i32",
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}
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}
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fn default(&self) -> &'static str {
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match self {
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Ty::F32 => "0_f32",
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Ty::F64 => "0_f64",
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Ty::I32 => "0_i32",
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Ty::Bool => "false",
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}
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}
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fn to_i64(&self) -> &'static str {
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match self {
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Ty::F32 => ".to_bits() as i64",
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Ty::F64 => ".to_bits() as i64",
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Ty::I32 => " as i64",
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Ty::Bool => " as i64",
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}
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}
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}
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fn generate_test_outputs(functions: &mut [Function]) {
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let mut src = String::new();
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let dst = std::env::var("OUT_DIR").unwrap();
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// Generate a program which will run all tests with all inputs in
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// `functions`. This program will write all outputs to stdout (in a
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// binary format).
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src.push_str("use std::io::Write;");
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src.push_str("fn main() {");
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src.push_str("let mut result = Vec::new();");
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for function in functions.iter_mut() {
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src.push_str("unsafe {");
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src.push_str("extern { fn ");
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src.push_str(&function.name);
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src.push_str("(");
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let (ret, retptr) = match function.name.as_str() {
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"sincos" | "sincosf" => (None, &function.ret[..]),
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_ => (Some(&function.ret[0]), &function.ret[1..]),
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};
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for (i, arg) in function.args.iter().enumerate() {
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src.push_str(&format!("arg{}: {},", i, arg.libc_ty()));
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}
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for (i, ret) in retptr.iter().enumerate() {
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src.push_str(&format!("argret{}: {},", i, ret.libc_pty()));
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}
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src.push_str(")");
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if let Some(ty) = ret {
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src.push_str(" -> ");
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src.push_str(ty.libc_ty());
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}
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src.push_str("; }");
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src.push_str(&format!("static TESTS: &[[i64; {}]]", function.args.len()));
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src.push_str(" = &[");
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for test in function.tests.iter() {
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src.push_str("[");
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for val in test.inputs.iter() {
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src.push_str(&val.to_string());
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src.push_str(",");
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}
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src.push_str("],");
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}
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src.push_str("];");
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src.push_str("for test in TESTS {");
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for (i, arg) in retptr.iter().enumerate() {
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src.push_str(&format!("let mut argret{} = {};", i, arg.default()));
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}
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src.push_str("let output = ");
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src.push_str(&function.name);
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src.push_str("(");
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for (i, arg) in function.args.iter().enumerate() {
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src.push_str(&match arg {
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Ty::F32 => format!("f32::from_bits(test[{}] as u32)", i),
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Ty::F64 => format!("f64::from_bits(test[{}] as u64)", i),
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Ty::I32 => format!("test[{}] as i32", i),
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Ty::Bool => format!("test[{}] as i32", i),
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});
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src.push_str(",");
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}
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for (i, _) in retptr.iter().enumerate() {
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src.push_str(&format!("&mut argret{},", i));
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}
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src.push_str(");");
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if let Some(ty) = &ret {
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src.push_str(&format!("let output = output{};", ty.to_i64()));
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src.push_str("result.extend_from_slice(&output.to_le_bytes());");
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}
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for (i, ret) in retptr.iter().enumerate() {
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src.push_str(&format!(
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"result.extend_from_slice(&(argret{}{}).to_le_bytes());",
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i,
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ret.to_i64(),
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));
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}
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src.push_str("}");
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src.push_str("}");
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}
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src.push_str("std::io::stdout().write_all(&result).unwrap();");
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src.push_str("}");
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let path = format!("{}/gen.rs", dst);
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fs::write(&path, src).unwrap();
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// Make it somewhat pretty if something goes wrong
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drop(Command::new("rustfmt").arg(&path).status());
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// Compile and execute this tests for the musl target, assuming we're an
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// x86_64 host effectively.
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let status = Command::new("rustc")
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.current_dir(&dst)
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.arg(&path)
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.arg("--target=x86_64-unknown-linux-musl")
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.status()
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.unwrap();
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assert!(status.success());
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let output = Command::new("./gen").current_dir(&dst).output().unwrap();
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assert!(output.status.success());
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assert!(output.stderr.is_empty());
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// Map all the output bytes back to an `i64` and then shove it all into
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// the expected results.
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let mut results = output.stdout.chunks_exact(8).map(|buf| {
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let mut exact = [0; 8];
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exact.copy_from_slice(buf);
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i64::from_le_bytes(exact)
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});
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for f in functions.iter_mut() {
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for test in f.tests.iter_mut() {
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test.outputs = (0..f.ret.len()).map(|_| results.next().unwrap()).collect();
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}
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}
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assert!(results.next().is_none());
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}
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/// Codegens a file which has a ton of `#[test]` annotations for all the
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/// tests that we generated above.
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fn generate_unit_tests(functions: &[Function]) {
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let mut src = String::new();
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let dst = std::env::var("OUT_DIR").unwrap();
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for function in functions {
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src.push_str("#[test]");
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src.push_str("fn ");
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src.push_str(&function.name);
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src.push_str("_matches_musl() {");
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src.push_str(&format!(
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"static TESTS: &[([i64; {}], [i64; {}])]",
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function.args.len(),
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function.ret.len(),
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));
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src.push_str(" = &[");
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for test in function.tests.iter() {
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src.push_str("([");
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for val in test.inputs.iter() {
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src.push_str(&val.to_string());
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src.push_str(",");
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}
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src.push_str("],");
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src.push_str("[");
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for val in test.outputs.iter() {
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src.push_str(&val.to_string());
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src.push_str(",");
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}
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src.push_str("],");
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src.push_str("),");
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}
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src.push_str("];");
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src.push_str("for (test, expected) in TESTS {");
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src.push_str("let output = ");
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src.push_str(&function.name);
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src.push_str("(");
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for (i, arg) in function.args.iter().enumerate() {
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src.push_str(&match arg {
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Ty::F32 => format!("f32::from_bits(test[{}] as u32)", i),
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Ty::F64 => format!("f64::from_bits(test[{}] as u64)", i),
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Ty::I32 => format!("test[{}] as i32", i),
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Ty::Bool => format!("test[{}] as i32", i),
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});
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src.push_str(",");
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}
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src.push_str(");");
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for (i, ret) in function.ret.iter().enumerate() {
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let get = if function.ret.len() == 1 { String::new() } else { format!(".{}", i) };
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src.push_str(&(match ret {
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Ty::F32 => format!("if _eqf(output{}, f32::from_bits(expected[{}] as u32)).is_ok() {{ continue }}", get, i),
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Ty::F64 => format!("if _eq(output{}, f64::from_bits(expected[{}] as u64)).is_ok() {{ continue }}", get, i),
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Ty::I32 => format!("if output{} as i64 == expected[{}] {{ continue }}", get, i),
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Ty::Bool => unreachable!(),
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}));
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}
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src.push_str(
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r#"
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panic!("INPUT: {:?} EXPECTED: {:?} ACTUAL {:?}", test, expected, output);
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"#,
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);
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src.push_str("}");
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src.push_str("}");
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}
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let path = format!("{}/musl-tests.rs", dst);
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fs::write(&path, src).unwrap();
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// Try to make it somewhat pretty
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drop(Command::new("rustfmt").arg(&path).status());
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}
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}
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