Hi Darin,
WebAssembly.instantiate works asynchronously, so you have to keep your
program running for a while to wait for the asynchronous result, and keep
pumping the message loop and running microtasks to actually execute the
compilation tasks and promise resolution tasks that get added from the
background.
This is probably not the most elegant solution, but it works:
[...]
script->Run(context).ToLocal(&result);
// Keep running for 10 seconds, pumping the message loop and running
// microtasks.
auto start = std::chrono::system_clock::now();
do {
v8::platform::PumpMessageLoop(platform.get(), isolate);
isolate->RunMicrotasks();
} while (std::chrono::duration_cast<std::chrono::seconds>(
std::chrono::system_clock::now() - start)
.count() < 10);
Hope that helps,
Clemens
On Wed, Jan 15, 2020 at 9:15 AM Darin Dimitrov <darin.dimit...@gmail.com>
wrote:
> I have embedded V8 (7.8.279.19) inside my Android application and tried
> executing a script that compiles a WebAssembly module.
>
> Unfortunately the promise returned by the "WebAssembly.compile" method is
> never completed (neither the "then" or the "catch" methods are invoked).
> The same happens with the "WebAssembly.instantiate" method:
>
> std::unique_ptr<v8::Platform> platform = v8::platform::NewDefaultPlatform
> ();
> v8::V8::InitializePlatform(platform.get());
> v8::V8::Initialize();
>
> v8::Isolate::CreateParams create_params;
> create_params.array_buffer_allocator = v8::ArrayBuffer::Allocator::
> NewDefaultAllocator();
> v8::Isolate* isolate = v8::Isolate::New(create_params);
> v8::Isolate::Scope isolate_scope(isolate);
> v8::HandleScope scope(isolate);
> auto global_template = v8::ObjectTemplate::New(isolate);
> global_template->Set(v8::String::NewFromUtf8(isolate, "log", v8::
> NewStringType::kNormal).ToLocalChecked(), v8::FunctionTemplate::New(
> isolate, [](const v8::FunctionCallbackInfo<v8::Value>& info) {
> v8::Isolate* isolate = info.GetIsolate();
> v8::String::Utf8Value utf(isolate, info[0].As<v8::String>());
> __android_log_print(ANDROID_LOG_DEBUG, "V8Native", "%s",*utf);
> }));
>
> v8::Local<v8::Context> context = v8::Context::New(isolate, nullptr,
> global_template);
> v8::Context::Scope context_scope(context);
> const char* csource = R"(
> let bytes = new Uint8Array([
> 0,97,115,109,1,0,0,0,1,8,2,96,1,127,0,96,0,0,2,8,1,2,106,
> 115,1,95,0,0,3,2,1,1,8,1,1,10,9,1,7,0,65,185,10,16,0,11
> ]);
> log('before the call');
> WebAssembly
> .instantiate(bytes)
> .then(obj => log('success'))
> .catch(err => log('log'));
> )";
> v8::Local<v8::String> source = v8::String::NewFromUtf8(isolate, csource,
> v8::NewStringType::kNormal).ToLocalChecked();
> v8::Local<v8::Script> script = v8::Script::Compile(context, source).
> ToLocalChecked();
> v8::Local<v8::Value> result;
> script->Run(context).ToLocal(&result);
>
>
>
> Do you have any idea what I might be missing here? The same javascript code
> works fine in the desktop browser.
>
> --
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--
Clemens Backes
Software Engineer
cleme...@google.com
Google Germany GmbH
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