bd374fd6fc
* Add Wasmtime-specific C API functions to return errors This commit adds new `wasmtime_*` symbols to the C API, many of which mirror the existing counterparts in the `wasm.h` header. These APIs are enhanced in a number of respects: * Detailed error information is now available through a `wasmtime_error_t`. Currently this only exposes one function which is to extract a string version of the error. * There is a distinction now between traps and errors during instantiation and function calling. Traps only happen if wasm traps, and errors can happen for things like runtime type errors when interacting with the API. * APIs have improved safety with respect to embedders where the lengths of arrays are now taken as explicit parameters rather than assumed from other parameters. * Handle trap updates * Update C examples * Fix memory.c compile on MSVC * Update test assertions * Refactor C slightly * Bare-bones .NET update * Remove bogus nul handling
104 lines
2.6 KiB
Rust
104 lines
2.6 KiB
Rust
use anyhow::Result;
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use std::cell::RefCell;
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use std::rc::Rc;
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use wasmtime::*;
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#[test]
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fn test_import_calling_export() {
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const WAT: &str = r#"
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(module
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(type $t0 (func))
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(import "" "imp" (func $.imp (type $t0)))
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(func $run call $.imp)
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(func $other)
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(export "run" (func $run))
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(export "other" (func $other))
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)
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"#;
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let store = Store::default();
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let module = Module::new(&store, WAT).expect("failed to create module");
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let other = Rc::new(RefCell::new(None::<Func>));
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let other2 = other.clone();
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let callback_func = Func::new(
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&store,
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FuncType::new(Box::new([]), Box::new([])),
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move |_, _, _| {
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other2
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.borrow()
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.as_ref()
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.expect("expected a function ref")
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.call(&[])
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.expect("expected function not to trap");
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Ok(())
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},
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);
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let imports = vec![callback_func.into()];
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let instance =
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Instance::new(&module, imports.as_slice()).expect("failed to instantiate module");
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let exports = instance.exports();
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assert!(!exports.is_empty());
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let run_func = exports[0]
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.func()
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.expect("expected a run func in the module");
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*other.borrow_mut() = Some(
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exports[1]
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.func()
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.expect("expected an other func in the module")
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.clone(),
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);
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run_func.call(&[]).expect("expected function not to trap");
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}
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#[test]
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fn test_returns_incorrect_type() -> Result<()> {
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const WAT: &str = r#"
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(module
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(import "env" "evil" (func $evil (result i32)))
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(func (export "run") (result i32)
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(call $evil)
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)
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)
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"#;
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let store = Store::default();
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let module = Module::new(&store, WAT)?;
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let callback_func = Func::new(
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&store,
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FuncType::new(Box::new([]), Box::new([ValType::I32])),
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|_, _, results| {
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// Evil! Returns I64 here instead of promised in the signature I32.
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results[0] = Val::I64(228);
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Ok(())
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},
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);
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let imports = vec![callback_func.into()];
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let instance = Instance::new(&module, imports.as_slice())?;
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let exports = instance.exports();
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assert!(!exports.is_empty());
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let run_func = exports[0]
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.func()
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.expect("expected a run func in the module");
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let trap = run_func
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.call(&[])
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.expect_err("the execution should fail")
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.downcast::<Trap>()?;
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assert_eq!(
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trap.message(),
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"function attempted to return an incompatible value"
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);
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Ok(())
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}
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