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Set the thread stack guarantee for fibers on Windows.

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This commit fixes the Windows implementation of fibers in Wasmtime to
reserve enough staack space for Rust to handle any stack overflow
exceptions.
This commit is contained in:
Peter Huene
2021-03-19 12:50:38 -07:00
parent 8e34022784
commit f556bd18a7
2 changed files with 22 additions and 12 deletions
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26
tests/host_segfault.rs
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@@ -29,13 +29,20 @@ fn segfault() -> ! {
}
}
fn overrun_the_stack() -> usize {
let mut a = [0u8; 1024];
if a.as_mut_ptr() as usize == 1 {
return 1;
} else {
return a.as_mut_ptr() as usize + overrun_the_stack();
fn allocate_stack_space() -> ! {
let _a = [0u8; 1024];
for _ in 0..100000 {
allocate_stack_space();
}
unreachable!()
}
fn overrun_the_stack() -> ! {
println!("{}", CONFIRM);
io::stdout().flush().unwrap();
allocate_stack_space();
}
fn run_future<F: Future>(future: F) -> F::Output {
@@ -104,8 +111,6 @@ fn main() {
let store = Store::new(&engine);
let module = Module::new(&engine, "(module)").unwrap();
let _instance = Instance::new(&store, &module, &[]).unwrap();
println!("{}", CONFIRM);
io::stdout().flush().unwrap();
overrun_the_stack();
},
true,
@@ -118,6 +123,7 @@ fn main() {
let module = Module::new(&engine, r#"(import "" "" (func)) (start 0)"#).unwrap();
let segfault = Func::wrap(&store, || segfault());
Instance::new(&store, &module, &[segfault.into()]).unwrap();
unreachable!();
},
false,
),
@@ -130,8 +136,6 @@ fn main() {
let store = Store::new(&engine);
let f = Func::wrap0_async(&store, (), |_, _| {
Box::new(async {
print!("{}", CONFIRM);
io::stdout().flush().unwrap();
overrun_the_stack();
})
});
@@ -150,8 +154,6 @@ fn main() {
let store = Store::new(&engine);
let f = Func::wrap0_async(&store, (), |_, _| {
Box::new(async {
println!("{}", CONFIRM);
io::stdout().flush().unwrap();
overrun_the_stack();
})
});