mem: temp allocation primitives for wasm

mem/mem_wasm.go

@@ -0,0 +1,30 @@
+//go:build wasm
+
+package mem
+
+import (
+	"runtime"
+	"unsafe"
+)
+
+func reserve(total_address_space uintptr) ([]byte, error) {
+	data := make([]byte, total_address_space)
+	p.Pin(unsafe.SliceData(data))
+	return data, nil
+}
+
+func release(_ []byte) error {
+	p.Unpin()
+	return nil
+}
+
+func commit(_ []byte, _ Access) error {
+	return nil
+}
+
+func decommit(committed []byte) (err error) {
+	clear(committed)
+	return nil
+}
+
+var p runtime.Pinner