cherry/wasmtest: test wasmexport function called before runtime initialization
This should give an explicit error.
Change-Id: Ib0cff84366dd765c1384490a32890c5e23c13647
Reviewed-on: https://go-review.googlesource.com/c/scratch/+/643058
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
diff --git a/cherry/wasmtest/w.go b/cherry/wasmtest/w.go
index f2ad733..749c377 100644
--- a/cherry/wasmtest/w.go
+++ b/cherry/wasmtest/w.go
@@ -19,8 +19,10 @@
package main
import (
+ "bytes"
"context"
"fmt"
+ "io"
"os"
"github.com/tetratelabs/wazero"
@@ -50,6 +52,9 @@
println("J", x, "end")
}
+var errbuf bytes.Buffer
+var stderr = io.MultiWriter(os.Stderr, &errbuf)
+
func main() {
ctx := context.Background()
@@ -71,7 +76,7 @@
}
config := wazero.NewModuleConfig().
- WithStdout(os.Stdout).WithStderr(os.Stderr).
+ WithStdout(os.Stdout).WithStderr(stderr).
WithStartFunctions() // don't call _start
wasi_snapshot_preview1.MustInstantiate(ctx, r)
@@ -117,8 +122,15 @@
}
// Library mode.
- entry = m.ExportedFunction("_initialize")
+ fmt.Println("Libaray mode: call export before initialization")
+ shouldPanic(func() { I() })
+ // reset module
+ m, err = r.InstantiateWithConfig(ctx, buf, config)
+ if err != nil {
+ panic(err)
+ }
fmt.Println("Library mode: initialize")
+ entry = m.ExportedFunction("_initialize")
_, err = entry.Call(ctx)
if err != nil {
panic(err)
@@ -126,3 +138,16 @@
fmt.Println("\nLibrary mode: call export functions")
I()
}
+
+func shouldPanic(f func()) {
+ defer func() {
+ e := recover()
+ if e == nil {
+ panic("did not panic")
+ }
+ if !bytes.Contains(errbuf.Bytes(), []byte("runtime: wasmexport function called before runtime initialization")) {
+ panic("expected error message missing")
+ }
+ }()
+ f()
+}
