[api] Change Wasm ModuleCompiled notification

- Removes ModuleCompiledCallback typedef and Set function.
- Adds WasmStreaming::Client abstraction and Set function.

Bug: chromium:719172
Change-Id: I8a207b628394a7660bda73cde560da1e461248a7
Reviewed-on: https://chromium-review.googlesource.com/c/1377450Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58454}

include/v8.h

@@ -4453,6 +4453,19 @@ class V8_EXPORT WasmStreaming final {
  public:
   class WasmStreamingImpl;
 
+  /**
+   * Client to receive streaming event notifications.
+   */
+  class Client {
+   public:
+    virtual ~Client() = default;
+    /**
+     * Passes the fully compiled module to the client. This can be used to
+     * implement code caching.
+     */
+    virtual void OnModuleCompiled(CompiledWasmModule compiled_module) = 0;
+  };
+
   explicit WasmStreaming(std::unique_ptr<WasmStreamingImpl> impl);
 
   ~WasmStreaming();
@@ -4478,28 +4491,20 @@ class V8_EXPORT WasmStreaming final {
   void Abort(MaybeLocal<Value> exception);
 
   /**
-   * Callback for module compiled notifications. |data| is the identifier
-   * passed to {SetModuleCompiledCallback}, |compiled_module| is the result.
-   */
-  typedef void (*ModuleCompiledCallback)(intptr_t data,
-                                         CompiledWasmModule compiled_module);
-
-  /**
-   * Sets a callback for when compilation of the Wasm module has been completed
-   * to the highest tier. |data| will be passed as the first callback parameter.
-   */
-  void SetModuleCompiledCallback(ModuleCompiledCallback callback,
-                                 intptr_t data);
-
-  /**
-   * Passes previously compiled module bytes. This must be called before calling
-   * any non-static methods of this class. Returns true if the module bytes can
-   * be used, false otherwise. The buffer passed into {SetCompiledModuleBytes}
+   * Passes previously compiled module bytes. This must be called before
+   * {OnBytesReceived}, {Finish}, or {Abort}. Returns true if the module bytes
+   * can be used, false otherwise. The buffer passed via {bytes} and {size}
    * is owned by the caller. If {SetCompiledModuleBytes} returns true, the
    * buffer must remain valid until either {Finish} or {Abort} completes.
    */
   bool SetCompiledModuleBytes(const uint8_t* bytes, size_t size);
 
+  /**
+   * Sets the client object that will receive streaming event notifications.
+   * This must be called before {OnBytesReceived}, {Finish}, or {Abort}.
+   */
+  void SetClient(std::shared_ptr<Client> client);
+
   /**
    * Unpacks a {WasmStreaming} object wrapped in a  {Managed} for the embedder.
    * Since the embedder is on the other side of the API, it cannot unpack the

src/wasm/streaming-decoder.cc

@@ -157,8 +157,7 @@ void StreamingDecoder::NotifyRuntimeObjectsCreated(
   auto* comp_state = module_object->native_module()->compilation_state();
   comp_state->AddCallback(TopTierCompiledCallback{
       std::move(native_module), std::move(module_compiled_callback_)});
-  // The callback took ownership of the callback:
-  DCHECK_NULL(module_compiled_callback_);
+  module_compiled_callback_ = {};
 }
 
 // An abstract class to share code among the states which decode VarInts. This

src/wasm/wasm-js.cc

@@ -59,22 +59,20 @@ class WasmStreaming::WasmStreamingImpl {
         Utils::OpenHandle(*exception.ToLocalChecked()));
   }
 
-  void SetModuleCompiledCallback(ModuleCompiledCallback callback,
-                                 intptr_t data) {
-    // Wrap the embedder callback here so we can also wrap the result as a
-    // Local<WasmModuleObject> here.
-    streaming_decoder_->SetModuleCompiledCallback(
-        [callback,
-         data](const std::shared_ptr<i::wasm::NativeModule>& native_module) {
-          callback(data, Utils::Convert(native_module));
-        });
-  }
-
   bool SetCompiledModuleBytes(const uint8_t* bytes, size_t size) {
     if (!i::wasm::IsSupportedVersion({bytes, size})) return false;
     return streaming_decoder_->SetCompiledModuleBytes({bytes, size});
   }
 
+  void SetClient(std::shared_ptr<Client> client) {
+    // There are no other event notifications so just pass client to decoder.
+    // Wrap the client with a callback here so we can also wrap the result.
+    streaming_decoder_->SetModuleCompiledCallback(
+        [client](const std::shared_ptr<i::wasm::NativeModule>& native_module) {
+          client->OnModuleCompiled(Utils::Convert(native_module));
+        });
+  }
+
  private:
   Isolate* isolate_ = nullptr;
   std::shared_ptr<internal::wasm::StreamingDecoder> streaming_decoder_;
@@ -98,15 +96,14 @@ void WasmStreaming::Abort(MaybeLocal<Value> exception) {
   impl_->Abort(exception);
 }
 
-void WasmStreaming::SetModuleCompiledCallback(ModuleCompiledCallback callback,
-                                              intptr_t data) {
-  impl_->SetModuleCompiledCallback(callback, data);
-}
-
 bool WasmStreaming::SetCompiledModuleBytes(const uint8_t* bytes, size_t size) {
   return impl_->SetCompiledModuleBytes(bytes, size);
 }
 
+void WasmStreaming::SetClient(std::shared_ptr<Client> client) {
+  impl_->SetClient(client);
+}
+
 // static
 std::shared_ptr<WasmStreaming> WasmStreaming::Unpack(Isolate* isolate,
                                                      Local<Value> value) {