92ba4929e5
This drops the text format (%.wat) and renames InstantiateModuleFromCode to InstantiateModuleFromBinary as it is no longer ambiguous. We decided to stop supporting the text format as it isn't typically used in production, yet costs a lot of work to develop. Given the resources available and the increased work added with WebAssembly 2.0 and soon WASI 2, we can't afford to spend the time on it. The old parser is used only internally and will eventually be moved to its own repository named watzero, possibly towards archival. See #59 Signed-off-by: Adrian Cole <adrian@tetrate.io>
87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
package main
|
|
|
|
import (
|
|
"context"
|
|
_ "embed"
|
|
"fmt"
|
|
"log"
|
|
|
|
"github.com/tetratelabs/wazero"
|
|
"github.com/tetratelabs/wazero/api"
|
|
)
|
|
|
|
// counterWasm was generated by the following:
|
|
// cd testdata; wat2wasm --debug-names counter.wat
|
|
//go:embed testdata/counter.wasm
|
|
var counterWasm []byte
|
|
|
|
// main shows how to instantiate the same module name multiple times in the same runtime.
|
|
//
|
|
// See README.md for a full description.
|
|
func main() {
|
|
// Choose the context to use for function calls.
|
|
ctx := context.Background()
|
|
|
|
// Create a new WebAssembly Runtime.
|
|
r := wazero.NewRuntime()
|
|
defer r.Close(ctx) // This closes everything this Runtime created.
|
|
|
|
// Compile WebAssembly that requires its own "env" module.
|
|
compiled, err := r.CompileModule(ctx, counterWasm, wazero.NewCompileConfig())
|
|
if err != nil {
|
|
log.Panicln(err)
|
|
}
|
|
|
|
// Instantiate two modules, with identical configuration, but independent state.
|
|
m1 := instantiateWithEnv(ctx, r, compiled)
|
|
m2 := instantiateWithEnv(ctx, r, compiled)
|
|
|
|
for i := 0; i < 2; i++ {
|
|
fmt.Printf("m1 counter=%d\n", counterGet(ctx, m1))
|
|
fmt.Printf("m2 counter=%d\n", counterGet(ctx, m2))
|
|
}
|
|
}
|
|
|
|
// count calls "counter.get" in the given namespace
|
|
func counterGet(ctx context.Context, mod api.Module) uint64 {
|
|
results, err := mod.ExportedFunction("get").Call(ctx)
|
|
if err != nil {
|
|
log.Panicln(err)
|
|
}
|
|
return results[0]
|
|
}
|
|
|
|
// counter is an example showing state that needs to be independent per importing module.
|
|
type counter struct {
|
|
counter uint32
|
|
}
|
|
|
|
func (e *counter) getAndIncrement() (ret uint32) {
|
|
ret = e.counter
|
|
e.counter++
|
|
return
|
|
}
|
|
|
|
// instantiateWithEnv returns a module instantiated with its own "env" module.
|
|
func instantiateWithEnv(ctx context.Context, r wazero.Runtime, module wazero.CompiledModule) api.Module {
|
|
// Create a new namespace to instantiate modules into.
|
|
ns := r.NewNamespace(ctx) // Note: this is closed when the Runtime is
|
|
|
|
// Instantiate a new "env" module which exports a stateful function.
|
|
c := &counter{}
|
|
_, err := r.NewModuleBuilder("env").
|
|
ExportFunction("next_i32", c.getAndIncrement).
|
|
Instantiate(ctx, ns)
|
|
if err != nil {
|
|
log.Panicln(err)
|
|
}
|
|
|
|
// Instantiate the module that imports "env".
|
|
mod, err := ns.InstantiateModule(ctx, module, wazero.NewModuleConfig())
|
|
if err != nil {
|
|
log.Panicln(err)
|
|
}
|
|
|
|
return mod
|
|
}
|