[wasm] external serialization APIs

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 2a248b7d9134f77e001bdac44d9a7887b6c33214..d16c7dd0da4e3262beb630f18000143145a1f702 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1002,6 +1002,7 @@ template <class C> inline bool Is(Object* obj);
   V(JSWeakMap)                   \
   V(JSWeakSet)                   \
   V(JSRegExp)                    \
+  V(WebAssemblyCompiledModule)   \
   V(HashTable)                   \
   V(Dictionary)                  \
   V(UnseededNumberDictionary)    \
@@ -8149,6 +8150,25 @@ class JSMessageObject: public JSObject {
                               kSize> BodyDescriptor;
 };
 
+// A compiled web assembly module.
+class WebAssemblyCompiledModule : public JSObject {
+ public:
+  // Serialize the compiled module. The returned buffer is owned by
+  // the caller, who may simply leave the return value drop out of
+  // scope, once done processing the bytes.
+  // TODO(mtrofin): to avoid increased memory pressure, we should
+  // explore a caller-provided segmented memory design.
+  std::pair<std::unique_ptr<const byte>, size_t> Serialize();
+
+  // Deserialize a compiled module. The buffer is owned by the caller and may
+  // be released after deserialization returns.
+  static MaybeHandle<WebAssemblyCompiledModule> Deserialize(Isolate* isolate,
+                                                            const byte* data,
+                                                            size_t size);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(WebAssemblyCompiledModule);
+};
 
 // Regular expressions
 // The regular expression holds a single reference to a FixedArray in