fb0b9e3ae6
* Remove Cranelift's OutOfBounds trap, which is no longer used. * Change proc_exit to unwind instead of exit the host process. This implements the semantics in https://github.com/WebAssembly/WASI/pull/235. Fixes #783. Fixes #993. * Fix exit-status tests on Windows. * Revert the wiggle changes and re-introduce the wasi-common implementations. * Move `wasi_proc_exit` into the wasmtime-wasi crate. * Revert the spec_testsuite change. * Remove the old proc_exit implementations. * Make `TrapReason` an implementation detail. * Allow exit status 2 on Windows too. * Fix a documentation link. * Really fix a documentation link.
61 lines
1.9 KiB
Rust
61 lines
1.9 KiB
Rust
use std::sync::atomic::{AtomicUsize, Ordering::SeqCst};
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use wasmtime::*;
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#[test]
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fn host_always_has_some_stack() -> anyhow::Result<()> {
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static HITS: AtomicUsize = AtomicUsize::new(0);
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// assume hosts always have at least 512k of stack
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const HOST_STACK: usize = 512 * 1024;
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let store = Store::default();
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// Create a module that's infinitely recursive, but calls the host on each
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// level of wasm stack to always test how much host stack we have left.
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let module = Module::new(
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&store,
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r#"
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(module
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(import "" "" (func $host))
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(func $recursive (export "foo")
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call $host
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call $recursive)
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)
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"#,
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)?;
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let func = Func::wrap(&store, test_host_stack);
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let instance = Instance::new(&module, &[func.into()])?;
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let foo = instance.get_func("foo").unwrap().get0::<()>()?;
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// Make sure that our function traps and the trap says that the call stack
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// has been exhausted.
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let trap = foo().unwrap_err();
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assert!(
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trap.to_string().contains("call stack exhausted"),
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"{}",
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trap.to_string()
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);
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// Additionally, however, and this is the crucial test, make sure that the
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// host function actually completed. If HITS is 1 then we entered but didn't
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// exit meaning we segfaulted while executing the host, yet still tried to
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// recover from it with longjmp.
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assert_eq!(HITS.load(SeqCst), 0);
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return Ok(());
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fn test_host_stack() {
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HITS.fetch_add(1, SeqCst);
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assert!(consume_some_stack(0, HOST_STACK) > 0);
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HITS.fetch_sub(1, SeqCst);
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}
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#[inline(never)]
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fn consume_some_stack(ptr: usize, stack: usize) -> usize {
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if stack == 0 {
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return ptr;
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}
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let mut space = [0u8; 1024];
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consume_some_stack(space.as_mut_ptr() as usize, stack.saturating_sub(1024))
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}
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}
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