bcf3544924
* Optimize `Func::call` and its C API This commit is an alternative to #3298 which achieves effectively the same goal of optimizing the `Func::call` API as well as its C API sibling of `wasmtime_func_call`. The strategy taken here is different than #3298 though where a new API isn't created, rather a small tweak to an existing API is done. Specifically this commit handles the major sources of slowness with `Func::call` with: * Looking up the type of a function, to typecheck the arguments with and use to guide how the results should be loaded, no longer hits the rwlock in the `Engine` but instead each `Func` contains its own `FuncType`. This can be an unnecessary allocation for funcs not used with `Func::call`, so this is a downside of this implementation relative to #3298. A mitigating factor, though, is that instance exports are loaded lazily into the `Store` and in theory not too many funcs are active in the store as `Func` objects. * Temporary storage is amortized with a long-lived `Vec` in the `Store` rather than allocating a new vector on each call. This is basically the same strategy as #3294 only applied to different types in different places. Specifically `wasmtime::Store` now retains a `Vec<u128>` for `Func::call`, and the C API retains a `Vec<Val>` for calling `Func::call`. * Finally, an API breaking change is made to `Func::call` and its type signature (as well as `Func::call_async`). Instead of returning `Box<[Val]>` as it did before this function now takes a `results: &mut [Val]` parameter. This allows the caller to manage the allocation and we can amortize-remove it in `wasmtime_func_call` by using space after the parameters in the `Vec<Val>` we're passing in. This change is naturally a breaking change and we'll want to consider it carefully, but mitigating factors are that most embeddings are likely using `TypedFunc::call` instead and this signature taking a mutable slice better aligns with `Func::new` which receives a mutable slice for the results. Overall this change, in the benchmark of "call a nop function from the C API" is not quite as good as #3298. It's still a bit slower, on the order of 15ns, because there's lots of capacity checks around vectors and the type checks are slightly less optimized than before. Overall though this is still significantly better than today because allocations and the rwlock to acquire the type information are both avoided. I personally feel that this change is the best to do because it has less of an API impact than #3298. * Rebase issues
640 lines
18 KiB
Rust
640 lines
18 KiB
Rust
use anyhow::Result;
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use std::panic::{self, AssertUnwindSafe};
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use std::process::Command;
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use wasmtime::*;
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#[test]
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fn test_trap_return() -> Result<()> {
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let mut store = Store::<()>::default();
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let wat = r#"
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(module
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(func $hello (import "" "hello"))
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(func (export "run") (call $hello))
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)
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"#;
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let module = Module::new(store.engine(), wat)?;
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let hello_type = FuncType::new(None, None);
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let hello_func = Func::new(&mut store, hello_type, |_, _, _| Err(Trap::new("test 123")));
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let instance = Instance::new(&mut store, &module, &[hello_func.into()])?;
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let run_func = instance.get_typed_func::<(), (), _>(&mut store, "run")?;
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let e = run_func
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.call(&mut store, ())
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.err()
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.expect("error calling function");
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assert!(e.to_string().contains("test 123"));
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Ok(())
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}
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#[test]
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#[cfg_attr(all(target_os = "macos", target_arch = "aarch64"), ignore)] // TODO #2808 system libunwind is broken on aarch64
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fn test_trap_trace() -> Result<()> {
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let mut store = Store::<()>::default();
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let wat = r#"
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(module $hello_mod
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(func (export "run") (call $hello))
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(func $hello (unreachable))
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)
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"#;
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let module = Module::new(store.engine(), wat)?;
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let instance = Instance::new(&mut store, &module, &[])?;
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let run_func = instance.get_typed_func::<(), (), _>(&mut store, "run")?;
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let e = run_func
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.call(&mut store, ())
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.err()
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.expect("error calling function");
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let trace = e.trace();
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assert_eq!(trace.len(), 2);
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assert_eq!(trace[0].module_name().unwrap(), "hello_mod");
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assert_eq!(trace[0].func_index(), 1);
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assert_eq!(trace[0].func_name(), Some("hello"));
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assert_eq!(trace[0].func_offset(), 1);
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assert_eq!(trace[0].module_offset(), 0x26);
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assert_eq!(trace[1].module_name().unwrap(), "hello_mod");
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assert_eq!(trace[1].func_index(), 0);
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assert_eq!(trace[1].func_name(), None);
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assert_eq!(trace[1].func_offset(), 1);
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assert_eq!(trace[1].module_offset(), 0x21);
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assert!(
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e.to_string().contains("unreachable"),
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"wrong message: {}",
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e.to_string()
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);
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Ok(())
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}
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#[test]
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#[cfg_attr(all(target_os = "macos", target_arch = "aarch64"), ignore)] // TODO #2808 system libunwind is broken on aarch64
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fn test_trap_trace_cb() -> Result<()> {
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let mut store = Store::<()>::default();
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let wat = r#"
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(module $hello_mod
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(import "" "throw" (func $throw))
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(func (export "run") (call $hello))
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(func $hello (call $throw))
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)
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"#;
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let fn_type = FuncType::new(None, None);
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let fn_func = Func::new(&mut store, fn_type, |_, _, _| Err(Trap::new("cb throw")));
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let module = Module::new(store.engine(), wat)?;
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let instance = Instance::new(&mut store, &module, &[fn_func.into()])?;
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let run_func = instance.get_typed_func::<(), (), _>(&mut store, "run")?;
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let e = run_func
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.call(&mut store, ())
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.err()
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.expect("error calling function");
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let trace = e.trace();
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assert_eq!(trace.len(), 2);
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assert_eq!(trace[0].module_name().unwrap(), "hello_mod");
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assert_eq!(trace[0].func_index(), 2);
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assert_eq!(trace[1].module_name().unwrap(), "hello_mod");
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assert_eq!(trace[1].func_index(), 1);
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assert!(e.to_string().contains("cb throw"));
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Ok(())
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}
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#[test]
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#[cfg_attr(all(target_os = "macos", target_arch = "aarch64"), ignore)] // TODO #2808 system libunwind is broken on aarch64
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fn test_trap_stack_overflow() -> Result<()> {
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let mut store = Store::<()>::default();
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let wat = r#"
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(module $rec_mod
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(func $run (export "run") (call $run))
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)
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"#;
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let module = Module::new(store.engine(), wat)?;
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let instance = Instance::new(&mut store, &module, &[])?;
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let run_func = instance.get_typed_func::<(), (), _>(&mut store, "run")?;
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let e = run_func
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.call(&mut store, ())
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.err()
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.expect("error calling function");
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let trace = e.trace();
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assert!(trace.len() >= 32);
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for i in 0..trace.len() {
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assert_eq!(trace[i].module_name().unwrap(), "rec_mod");
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assert_eq!(trace[i].func_index(), 0);
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assert_eq!(trace[i].func_name(), Some("run"));
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}
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assert!(e.to_string().contains("call stack exhausted"));
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Ok(())
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}
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#[test]
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#[cfg_attr(all(target_os = "macos", target_arch = "aarch64"), ignore)] // TODO #2808 system libunwind is broken on aarch64
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fn trap_display_pretty() -> Result<()> {
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let mut store = Store::<()>::default();
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let wat = r#"
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(module $m
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(func $die unreachable)
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(func call $die)
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(func $foo call 1)
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(func (export "bar") call $foo)
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)
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"#;
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let module = Module::new(store.engine(), wat)?;
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let instance = Instance::new(&mut store, &module, &[])?;
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let run_func = instance.get_typed_func::<(), (), _>(&mut store, "bar")?;
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let e = run_func
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.call(&mut store, ())
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.err()
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.expect("error calling function");
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assert_eq!(
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e.to_string(),
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"\
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wasm trap: unreachable
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wasm backtrace:
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0: 0x23 - m!die
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1: 0x27 - m!<wasm function 1>
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2: 0x2c - m!foo
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3: 0x31 - m!<wasm function 3>
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"
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);
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Ok(())
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}
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#[test]
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#[cfg_attr(all(target_os = "macos", target_arch = "aarch64"), ignore)] // TODO #2808 system libunwind is broken on aarch64
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fn trap_display_multi_module() -> Result<()> {
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let mut store = Store::<()>::default();
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let wat = r#"
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(module $a
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(func $die unreachable)
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(func call $die)
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(func $foo call 1)
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(func (export "bar") call $foo)
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)
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"#;
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let module = Module::new(store.engine(), wat)?;
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let instance = Instance::new(&mut store, &module, &[])?;
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let bar = instance.get_export(&mut store, "bar").unwrap();
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let wat = r#"
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(module $b
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(import "" "" (func $bar))
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(func $middle call $bar)
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(func (export "bar2") call $middle)
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)
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"#;
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let module = Module::new(store.engine(), wat)?;
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let instance = Instance::new(&mut store, &module, &[bar])?;
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let bar2 = instance.get_typed_func::<(), (), _>(&mut store, "bar2")?;
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let e = bar2
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.call(&mut store, ())
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.err()
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.expect("error calling function");
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assert_eq!(
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e.to_string(),
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"\
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wasm trap: unreachable
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wasm backtrace:
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0: 0x23 - a!die
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1: 0x27 - a!<wasm function 1>
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2: 0x2c - a!foo
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3: 0x31 - a!<wasm function 3>
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4: 0x29 - b!middle
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5: 0x2e - b!<wasm function 2>
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"
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);
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Ok(())
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}
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#[test]
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fn trap_start_function_import() -> Result<()> {
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let mut store = Store::<()>::default();
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let binary = wat::parse_str(
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r#"
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(module $a
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(import "" "" (func $foo))
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(start $foo)
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)
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"#,
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)?;
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let module = Module::new(store.engine(), &binary)?;
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let sig = FuncType::new(None, None);
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let func = Func::new(&mut store, sig, |_, _, _| Err(Trap::new("user trap")));
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let err = Instance::new(&mut store, &module, &[func.into()])
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.err()
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.unwrap();
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assert!(err
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.downcast_ref::<Trap>()
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.unwrap()
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.to_string()
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.contains("user trap"));
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Ok(())
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}
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#[test]
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fn rust_panic_import() -> Result<()> {
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let mut store = Store::<()>::default();
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let binary = wat::parse_str(
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r#"
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(module $a
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(import "" "" (func $foo))
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(import "" "" (func $bar))
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(func (export "foo") call $foo)
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(func (export "bar") call $bar)
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)
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"#,
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)?;
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let module = Module::new(store.engine(), &binary)?;
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let sig = FuncType::new(None, None);
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let func = Func::new(&mut store, sig, |_, _, _| panic!("this is a panic"));
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let func2 = Func::wrap(&mut store, || panic!("this is another panic"));
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let instance = Instance::new(&mut store, &module, &[func.into(), func2.into()])?;
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let func = instance.get_typed_func::<(), (), _>(&mut store, "foo")?;
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let err =
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panic::catch_unwind(AssertUnwindSafe(|| drop(func.call(&mut store, ())))).unwrap_err();
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assert_eq!(err.downcast_ref::<&'static str>(), Some(&"this is a panic"));
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let func = instance.get_typed_func::<(), (), _>(&mut store, "bar")?;
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let err = panic::catch_unwind(AssertUnwindSafe(|| {
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drop(func.call(&mut store, ()));
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}))
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.unwrap_err();
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assert_eq!(
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err.downcast_ref::<&'static str>(),
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Some(&"this is another panic")
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);
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Ok(())
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}
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#[test]
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fn rust_panic_start_function() -> Result<()> {
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let mut store = Store::<()>::default();
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let binary = wat::parse_str(
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r#"
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(module $a
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(import "" "" (func $foo))
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(start $foo)
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)
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"#,
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)?;
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let module = Module::new(store.engine(), &binary)?;
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let sig = FuncType::new(None, None);
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let func = Func::new(&mut store, sig, |_, _, _| panic!("this is a panic"));
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let err = panic::catch_unwind(AssertUnwindSafe(|| {
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drop(Instance::new(&mut store, &module, &[func.into()]));
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}))
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.unwrap_err();
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assert_eq!(err.downcast_ref::<&'static str>(), Some(&"this is a panic"));
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let func = Func::wrap(&mut store, || panic!("this is another panic"));
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let err = panic::catch_unwind(AssertUnwindSafe(|| {
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drop(Instance::new(&mut store, &module, &[func.into()]));
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}))
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.unwrap_err();
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assert_eq!(
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err.downcast_ref::<&'static str>(),
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Some(&"this is another panic")
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);
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Ok(())
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}
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#[test]
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fn mismatched_arguments() -> Result<()> {
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let mut store = Store::<()>::default();
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let binary = wat::parse_str(
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r#"
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(module $a
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(func (export "foo") (param i32))
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)
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"#,
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)?;
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let module = Module::new(store.engine(), &binary)?;
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let instance = Instance::new(&mut store, &module, &[])?;
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let func = instance.get_func(&mut store, "foo").unwrap();
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assert_eq!(
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func.call(&mut store, &[], &mut []).unwrap_err().to_string(),
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"expected 1 arguments, got 0"
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);
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assert_eq!(
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func.call(&mut store, &[Val::F32(0)], &mut [])
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.unwrap_err()
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.to_string(),
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"argument type mismatch: found f32 but expected i32",
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);
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assert_eq!(
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func.call(&mut store, &[Val::I32(0), Val::I32(1)], &mut [])
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.unwrap_err()
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.to_string(),
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"expected 1 arguments, got 2"
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);
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Ok(())
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}
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#[test]
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fn call_signature_mismatch() -> Result<()> {
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let mut store = Store::<()>::default();
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let binary = wat::parse_str(
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r#"
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(module $a
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(func $foo
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i32.const 0
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call_indirect)
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(func $bar (param i32))
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(start $foo)
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(table 1 anyfunc)
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(elem (i32.const 0) 1)
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)
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"#,
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)?;
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let module = Module::new(store.engine(), &binary)?;
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let err = Instance::new(&mut store, &module, &[])
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.err()
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.unwrap()
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.downcast::<Trap>()
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.unwrap();
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assert!(err
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.to_string()
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.contains("wasm trap: indirect call type mismatch"));
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Ok(())
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}
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#[test]
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#[cfg_attr(all(target_os = "macos", target_arch = "aarch64"), ignore)] // TODO #2808 system libunwind is broken on aarch64
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fn start_trap_pretty() -> Result<()> {
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let mut store = Store::<()>::default();
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let wat = r#"
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(module $m
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(func $die unreachable)
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(func call $die)
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(func $foo call 1)
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(func $start call $foo)
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(start $start)
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)
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"#;
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let module = Module::new(store.engine(), wat)?;
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let e = match Instance::new(&mut store, &module, &[]) {
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Ok(_) => panic!("expected failure"),
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Err(e) => e.downcast::<Trap>()?,
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};
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assert_eq!(
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e.to_string(),
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"\
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wasm trap: unreachable
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wasm backtrace:
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0: 0x1d - m!die
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1: 0x21 - m!<wasm function 1>
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2: 0x26 - m!foo
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3: 0x2b - m!start
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"
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);
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Ok(())
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}
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|
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#[test]
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#[cfg_attr(all(target_os = "macos", target_arch = "aarch64"), ignore)] // TODO #2808 system libunwind is broken on aarch64
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fn present_after_module_drop() -> Result<()> {
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let mut store = Store::<()>::default();
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let module = Module::new(store.engine(), r#"(func (export "foo") unreachable)"#)?;
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let instance = Instance::new(&mut store, &module, &[])?;
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let func = instance.get_typed_func::<(), (), _>(&mut store, "foo")?;
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println!("asserting before we drop modules");
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assert_trap(func.call(&mut store, ()).unwrap_err());
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drop((instance, module));
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println!("asserting after drop");
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assert_trap(func.call(&mut store, ()).unwrap_err());
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return Ok(());
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|
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fn assert_trap(t: Trap) {
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println!("{}", t);
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assert_eq!(t.trace().len(), 1);
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assert_eq!(t.trace()[0].func_index(), 0);
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}
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}
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|
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fn assert_trap_code(wat: &str, code: wasmtime::TrapCode) {
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let mut store = Store::<()>::default();
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let module = Module::new(store.engine(), wat).unwrap();
|
|
|
|
let err = match Instance::new(&mut store, &module, &[]) {
|
|
Ok(_) => unreachable!(),
|
|
Err(e) => e,
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};
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let trap = err.downcast_ref::<Trap>().unwrap();
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assert_eq!(trap.trap_code(), Some(code));
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}
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|
|
#[test]
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|
fn heap_out_of_bounds_trap() {
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assert_trap_code(
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r#"
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|
(module
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|
(memory 0)
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|
(func $start (drop (i32.load (i32.const 1000000))))
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|
(start $start)
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|
)
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|
"#,
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|
TrapCode::MemoryOutOfBounds,
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|
);
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|
|
assert_trap_code(
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r#"
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|
(module
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(memory 0)
|
|
(func $start (drop (i32.load memory.size)))
|
|
(start $start)
|
|
)
|
|
"#,
|
|
TrapCode::MemoryOutOfBounds,
|
|
);
|
|
}
|
|
|
|
fn rustc(src: &str) -> Vec<u8> {
|
|
let td = tempfile::TempDir::new().unwrap();
|
|
let output = td.path().join("foo.wasm");
|
|
let input = td.path().join("input.rs");
|
|
std::fs::write(&input, src).unwrap();
|
|
let result = Command::new("rustc")
|
|
.arg(&input)
|
|
.arg("-o")
|
|
.arg(&output)
|
|
.arg("--target")
|
|
.arg("wasm32-wasi")
|
|
.arg("-g")
|
|
.output()
|
|
.unwrap();
|
|
if result.status.success() {
|
|
return std::fs::read(&output).unwrap();
|
|
}
|
|
panic!(
|
|
"rustc failed: {}\n{}",
|
|
result.status,
|
|
String::from_utf8_lossy(&result.stderr)
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
#[cfg_attr(all(target_os = "macos", target_arch = "aarch64"), ignore)] // TODO #2808 system libunwind is broken on aarch64
|
|
fn parse_dwarf_info() -> Result<()> {
|
|
let wasm = rustc(
|
|
"
|
|
fn main() {
|
|
panic!();
|
|
}
|
|
",
|
|
);
|
|
let mut config = Config::new();
|
|
config.wasm_backtrace_details(WasmBacktraceDetails::Enable);
|
|
let engine = Engine::new(&config)?;
|
|
let module = Module::new(&engine, &wasm)?;
|
|
let mut linker = Linker::new(&engine);
|
|
wasmtime_wasi::add_to_linker(&mut linker, |s| s)?;
|
|
let mut store = Store::new(
|
|
&engine,
|
|
wasmtime_wasi::sync::WasiCtxBuilder::new()
|
|
.inherit_stdio()
|
|
.build(),
|
|
);
|
|
linker.module(&mut store, "", &module)?;
|
|
let run = linker.get_default(&mut store, "")?;
|
|
let trap = run
|
|
.call(&mut store, &[], &mut [])
|
|
.unwrap_err()
|
|
.downcast::<Trap>()?;
|
|
|
|
let mut found = false;
|
|
for frame in trap.trace() {
|
|
for symbol in frame.symbols() {
|
|
if let Some(file) = symbol.file() {
|
|
if file.ends_with("input.rs") {
|
|
found = true;
|
|
assert!(symbol.name().unwrap().contains("main"));
|
|
assert_eq!(symbol.line(), Some(3));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
assert!(found);
|
|
Ok(())
|
|
}
|
|
|
|
#[test]
|
|
#[cfg_attr(all(target_os = "macos", target_arch = "aarch64"), ignore)] // TODO #2808 system libunwind is broken on aarch64
|
|
fn no_hint_even_with_dwarf_info() -> Result<()> {
|
|
let mut config = Config::new();
|
|
config.wasm_backtrace_details(WasmBacktraceDetails::Disable);
|
|
let engine = Engine::new(&config)?;
|
|
let mut store = Store::new(&engine, ());
|
|
let module = Module::new(
|
|
&engine,
|
|
r#"
|
|
(module
|
|
(@custom ".debug_info" (after last) "")
|
|
(func $start
|
|
unreachable)
|
|
(start $start)
|
|
)
|
|
"#,
|
|
)?;
|
|
let trap = Instance::new(&mut store, &module, &[])
|
|
.err()
|
|
.unwrap()
|
|
.downcast::<Trap>()?;
|
|
assert_eq!(
|
|
trap.to_string(),
|
|
"\
|
|
wasm trap: unreachable
|
|
wasm backtrace:
|
|
0: 0x1a - <unknown>!start
|
|
"
|
|
);
|
|
Ok(())
|
|
}
|
|
|
|
#[test]
|
|
#[cfg_attr(all(target_os = "macos", target_arch = "aarch64"), ignore)] // TODO #2808 system libunwind is broken on aarch64
|
|
fn hint_with_dwarf_info() -> Result<()> {
|
|
// Skip this test if the env var is already configure, but in CI we're sure
|
|
// to run tests without this env var configured.
|
|
if std::env::var("WASMTIME_BACKTRACE_DETAILS").is_ok() {
|
|
return Ok(());
|
|
}
|
|
let mut store = Store::<()>::default();
|
|
let module = Module::new(
|
|
store.engine(),
|
|
r#"
|
|
(module
|
|
(@custom ".debug_info" (after last) "")
|
|
(func $start
|
|
unreachable)
|
|
(start $start)
|
|
)
|
|
"#,
|
|
)?;
|
|
let trap = Instance::new(&mut store, &module, &[])
|
|
.err()
|
|
.unwrap()
|
|
.downcast::<Trap>()?;
|
|
assert_eq!(
|
|
trap.to_string(),
|
|
"\
|
|
wasm trap: unreachable
|
|
wasm backtrace:
|
|
0: 0x1a - <unknown>!start
|
|
note: using the `WASMTIME_BACKTRACE_DETAILS=1` environment variable to may show more debugging information
|
|
"
|
|
);
|
|
Ok(())
|
|
}
|
|
|
|
#[test]
|
|
fn multithreaded_traps() -> Result<()> {
|
|
// Compile and run unreachable on a thread, then moves over the whole store to another thread,
|
|
// and make sure traps are still correctly caught after notifying the store of the move.
|
|
let mut store = Store::<()>::default();
|
|
let module = Module::new(
|
|
store.engine(),
|
|
r#"(module (func (export "run") unreachable))"#,
|
|
)?;
|
|
let instance = Instance::new(&mut store, &module, &[])?;
|
|
|
|
assert!(instance
|
|
.get_typed_func::<(), (), _>(&mut store, "run")?
|
|
.call(&mut store, ())
|
|
.is_err());
|
|
|
|
let handle = std::thread::spawn(move || {
|
|
assert!(instance
|
|
.get_typed_func::<(), (), _>(&mut store, "run")
|
|
.unwrap()
|
|
.call(&mut store, ())
|
|
.is_err());
|
|
});
|
|
|
|
handle.join().expect("couldn't join thread");
|
|
|
|
Ok(())
|
|
}
|