mem.cpp

     void memLimitTest() {
       Isolate::CreateParams create_params;
       v8::ResourceConstraints constraints;
       constraints.set_max_old_space_size(100);
       create_params.constraints = constraints;
       create_params.array_buffer_allocator =
           v8::ArrayBuffer::Allocator::NewDefaultAllocator();
       Isolate *isolate = Isolate::New(create_params);
       {
         Isolate::Scope isolate_scope(isolate);
         HandleScope handle_scope(isolate);
         Local<Context> context = Context::New(isolate);
         Context::Scope context_scope(context);
         Local<String> source =
             String::NewFromUtf8(isolate,
                                 "(function(){"
                                 "  var a = [];"
                                 " var b ='xxxxxxxxxxxxxxxxx';"
                                 "  for(i=0;i<5000000;i++){ a.push(b) }"
                                 " return a.length;"
                                 "})()",
                                 NewStringType::kNormal)
                 .ToLocalChecked();
         Local<Script> script = Script::Compile(context, source).ToLocalChecked();
         Local<Value> result = script->Run(context).ToLocalChecked();
         String::Utf8Value utf8(result);
         printf("%s\n", *utf8);
       }
       isolate->Dispose();
     }