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Update the *.wast runner to use the wasmtime API (#690)

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* Update the `*.wast` runner to use the `wasmtime` API

This commit migrates the `wasmtime-wast` crate, which executes `*.wast`
test suites, to use the `wasmtime` crate exclusively instead of the raw
support provided by the `wasmtime-*` family of crates.

The primary motivation for this change is to use `*.wast` test to test
the support for interface types, but interface types is only being added
in the `wasmtime` crate for now rather than all throughout the core
crates. This means that without this transition it's much more difficult
to write tests for wasm interface types!

A secondary motivation for this is that it's testing the support we
provide to users through the `wasmtime` crate, since that's the
expectation of what most users would use rather than the raw
`wasmtime-*` crates.

* Run rustfmt

* Fix the multi example

* Handle v128 values in the `wasmtime` crate

Ensure that we allocate 128-bit stack slots instead of 64-bit stack
slots.

* Update to master

* Add comment
This commit is contained in:
Alex Crichton
2019-12-17 13:30:50 -06:00
committed by GitHub
parent 4141daae68
commit d5a2eb397c
13 changed files with 368 additions and 478 deletions
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23
crates/api/src/callable.rs
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@@ -121,7 +121,7 @@ impl WasmtimeFn {
impl WrappedCallable for WasmtimeFn {
fn call(&self, params: &[Val], results: &mut [Val]) -> Result<(), HostRef<Trap>> {
use std::cmp::max;
use std::{mem, ptr};
use std::mem;
let (vmctx, body, signature) = match self.wasmtime_export() {
Export::Function {
@@ -132,21 +132,14 @@ impl WrappedCallable for WasmtimeFn {
_ => panic!("unexpected export type in Callable"),
};
let value_size = mem::size_of::<u64>();
let mut values_vec: Vec<u64> = vec![0; max(params.len(), results.len())];
let value_size = mem::size_of::<u128>();
let mut values_vec = vec![0; max(params.len(), results.len())];
// Store the argument values into `values_vec`.
for (index, arg) in params.iter().enumerate() {
unsafe {
let ptr = values_vec.as_mut_ptr().add(index);
match arg {
Val::I32(x) => ptr::write(ptr as *mut i32, *x),
Val::I64(x) => ptr::write(ptr as *mut i64, *x),
Val::F32(x) => ptr::write(ptr as *mut u32, *x),
Val::F64(x) => ptr::write(ptr as *mut u64, *x),
_ => unimplemented!("WasmtimeFn arg"),
}
arg.write_value_to(ptr);
}
}
@@ -176,13 +169,7 @@ impl WrappedCallable for WasmtimeFn {
unsafe {
let ptr = values_vec.as_ptr().add(index);
results[index] = match abi_param.value_type {
ir::types::I32 => Val::I32(ptr::read(ptr as *const i32)),
ir::types::I64 => Val::I64(ptr::read(ptr as *const i64)),
ir::types::F32 => Val::F32(ptr::read(ptr as *const u32)),
ir::types::F64 => Val::F64(ptr::read(ptr as *const u64)),
other => panic!("unsupported value type {:?}", other),
}
results[index] = Val::read_value_from(ptr, abi_param.value_type);
}
}