45ff2fe12f
This prepares for exposing operations like Memory.Grow while keeping the ability to trace what did that, by adding a `context.Context` initial parameter. This adds this to all API methods that mutate or return mutated data. Before, we made a change to trace functions and general lifecycle commands, but we missed this part. Ex. We track functions, but can't track what closed the module, changed memory or a mutable constant. Changing to do this now is not only more consistent, but helps us optimize at least the interpreter to help users identify otherwise opaque code that can cause harm. This is critical before we add more functions that can cause harm, such as Memory.Grow. Signed-off-by: Adrian Cole <adrian@tetrate.io>
86 lines
1.9 KiB
Go
86 lines
1.9 KiB
Go
//go:build amd64 && cgo && !windows
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package vs
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import (
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"context"
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"fmt"
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"github.com/birros/go-wasm3"
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)
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func init() {
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runtimes["wasm3-go"] = newWasm3Runtime
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}
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func newWasm3Runtime() runtime {
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return &wasm3Runtime{}
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}
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type wasm3Runtime struct {
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runtime *wasm3.Runtime
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}
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type wasm3Module struct {
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module *wasm3.Module
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funcs map[string]wasm3.FunctionWrapper
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}
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func (r *wasm3Runtime) Compile(_ context.Context, _ *runtimeConfig) (err error) {
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r.runtime = wasm3.NewRuntime(&wasm3.Config{
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Environment: wasm3.NewEnvironment(),
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StackSize: 64 * 1024, // from example
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})
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// There's currently no way to clone a parsed module, so we have to do it on instantiate.
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return
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}
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func (r *wasm3Runtime) Instantiate(_ context.Context, cfg *runtimeConfig) (mod module, err error) {
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m := &wasm3Module{funcs: map[string]wasm3.FunctionWrapper{}}
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m.module, err = r.runtime.ParseModule(cfg.moduleWasm)
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// TODO: not sure we can set cfg.moduleName in wasm3-go
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if _, err = r.runtime.LoadModule(m.module); err != nil {
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return
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}
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for _, funcName := range cfg.funcNames {
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var fn wasm3.FunctionWrapper
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if fn, err = r.runtime.FindFunction(funcName); err != nil {
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return
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} else if fn == nil {
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err = fmt.Errorf("%s is not an exported function", funcName)
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return
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} else {
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m.funcs[funcName] = fn
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}
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}
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mod = m
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return
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}
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func (r *wasm3Runtime) Close(_ context.Context) error {
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if r := r.runtime; r != nil {
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r.Destroy()
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}
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r.runtime = nil
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return nil
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}
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func (m *wasm3Module) CallI64_I64(_ context.Context, funcName string, param uint64) (uint64, error) {
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fn := m.funcs[funcName]
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// Note: go-wasm3 only maps the int type on input, though output params map based on value type
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if results, err := fn(int(param)); err != nil {
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return 0, err
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} else {
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return uint64(results[0].(int64)), nil
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}
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}
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func (m *wasm3Module) Close(_ context.Context) error {
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// module can't be destroyed
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m.module = nil
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m.funcs = nil
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return nil
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}
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