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Add a 'seed' parameter to gpui::test macro

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This lets you control the starting seed
This commit is contained in:
Max Brunsfeld 2021-07-08 17:30:54 -07:00
parent 140c8833fe
commit 9bfa5b62f2
1 changed files with 30 additions and 27 deletions
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57
gpui_macros/src/lib.rs
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@ -2,7 +2,8 @@ use proc_macro::TokenStream;
use quote::{format_ident, quote};
use std::mem;
use syn::{
parse_macro_input, parse_quote, AttributeArgs, ItemFn, Lit, Meta, MetaNameValue, NestedMeta,
parse_macro_input, parse_quote, spanned::Spanned as _, AttributeArgs, ItemFn, Lit, Meta,
NestedMeta,
};
#[proc_macro_attribute]
@ -11,7 +12,8 @@ pub fn test(args: TokenStream, function: TokenStream) -> TokenStream {
let args = syn::parse_macro_input!(args as AttributeArgs);
let mut max_retries = 0;
let mut iterations = 1;
let mut num_iterations = 1;
let mut starting_seed = 0;
for arg in args {
match arg {
NestedMeta::Meta(Meta::Path(name))
@ -20,17 +22,25 @@ pub fn test(args: TokenStream, function: TokenStream) -> TokenStream {
namespace = format_ident!("crate");
}
NestedMeta::Meta(Meta::NameValue(meta)) => {
if let Some(result) = parse_int_meta(&meta, "retries") {
match result {
Ok(value) => max_retries = value,
Err(error) => return TokenStream::from(error.into_compile_error()),
let key_name = meta.path.get_ident().map(|i| i.to_string());
let variable = match key_name.as_ref().map(String::as_str) {
Some("retries") => &mut max_retries,
Some("iterations") => &mut num_iterations,
Some("seed") => &mut starting_seed,
_ => {
return TokenStream::from(
syn::Error::new(meta.path.span(), "invalid argument")
.into_compile_error(),
)
}
} else if let Some(result) = parse_int_meta(&meta, "iterations") {
match result {
Ok(value) => iterations = value,
Err(error) => return TokenStream::from(error.into_compile_error()),
};
*variable = match parse_int(&meta.lit) {
Ok(value) => value,
Err(error) => {
return TokenStream::from(error.into_compile_error());
}
}
};
}
other => {
return TokenStream::from(
@ -61,8 +71,9 @@ pub fn test(args: TokenStream, function: TokenStream) -> TokenStream {
#inner_fn
let mut retries = 0;
let mut seed = 0;
let mut i = 0;
loop {
let seed = #starting_seed + i;
let result = std::panic::catch_unwind(|| {
let (foreground, background) = #namespace::executor::deterministic(seed as u64);
foreground.run(#inner_fn_name(#inner_fn_args));
@ -70,9 +81,9 @@ pub fn test(args: TokenStream, function: TokenStream) -> TokenStream {
match result {
Ok(result) => {
seed += 1;
retries = 0;
if seed == #iterations {
i += 1;
if i == #num_iterations {
return result
}
}
@ -81,7 +92,7 @@ pub fn test(args: TokenStream, function: TokenStream) -> TokenStream {
retries += 1;
println!("retrying: attempt {}", retries);
} else {
if #iterations > 1 {
if #num_iterations > 1 {
eprintln!("failing seed: {}", seed);
}
std::panic::resume_unwind(error);
@ -131,18 +142,10 @@ pub fn test(args: TokenStream, function: TokenStream) -> TokenStream {
TokenStream::from(quote!(#outer_fn))
}
fn parse_int_meta(meta: &MetaNameValue, name: &str) -> Option<syn::Result<usize>> {
let ident = meta.path.get_ident();
if ident.map_or(false, |n| n == name) {
if let Lit::Int(int) = &meta.lit {
Some(int.base10_parse())
} else {
Some(Err(syn::Error::new(
meta.lit.span(),
format!("{} mut be an integer", name),
)))
}
fn parse_int(literal: &Lit) -> syn::Result<usize> {
if let Lit::Int(int) = &literal {
int.base10_parse()
} else {
None
Err(syn::Error::new(literal.span(), "must be an integer"))
}
}