2016 Forecasts

Me and my partners from EV Volumes, which  by the way, published some interesting graphs on the last Q4 Europe article, were discussing in this past week how 2016 would be in the EV World, with some forecasts for the main markets and models, and with some EV Sales readers asking for some forecasts here, we decided to put it on paper online and in a year from now we will see how much did we got it right.

2016 Forecasts Jose Roland Viktor
World Total 850.000 850.000 N/A
World #1 BYD Tang Mit. Outlander PHEV N/A
China Total 400.000 350.000 350.000
China #1 BYD Tang BYD Tang BYD Tang
USA Total 175.000 170.000 170.000
USA #1 Chevrolet Volt Chevrolet Volt Tesla Model S
Japan Total 30.000 23.000 38.000
Japan #1 Nissan Leaf Mit. Outlander PHEV Mit. Outlander PHEV
Europe Total 250.000 280.000 280.000
Europe #1 Mit. Outlander PHEV Mit. Outlander PHEV Mit. Outlander PHEV
Netherlands T. 27.500 35.000 35.000
Netherlands #1 Mit. Outlander PHEV Mit. Outlander PHEV Mit. Outlander PHEV
Norway Total 45.000 50.000 50.000
Norway #1 Volkswagen e-Golf Volkswagen e-Golf Volkswagen e-Golf
UK Total 40.000 40.000 45.000
UK #1 Mit. Outlander PHEV Mit. Outlander PHEV Mit. Outlander PHEV
France Total 37.500 42.000 40.000
France #1 Renault Zoe Renault Zoe Renault Zoe
Germany Total 37.500 44.000 35.000
Germany #1 VW Passat GTE Kia Soul EV Kia Soul EV


A few comments, on these numbers, Roland thinks the Outlander PHEV will be the new Global #1, but only if they get the MY17 US launch right. Otherwise he thinks that it's Model S again. 

The same goes in the USA, Roland believes that the Volt will be able to beat the Model S, but isn't 100% sure on that, as a side note, Viktor is optimistic on the Chevy Bolt as he think that it will create an instant impact on the market once it lands later in the year.

Unlike my partners, i think the Nissan Leaf will have a good year in Japan, while Roland is pessimistic on the performance of the Japanese EV market.

Gathering consensus is the fact that The Netherlands will assist a sales slowdown regarding last year, unlike the other large EV markets in Europe.



V8 Extras

V8 implements a large subset of the JavaScript language’s built-in objects and functions in JavaScript itself. For example, you can see our promises implementation is written in JavaScript. Such built-ins are called self-hosted. These implementations are included in our startup snapshot so that new contexts can be quickly created without needing to setup and initialize the self-hosted built-ins at runtime.

Embedders of V8, such as Chromium, sometimes desire to write APIs in JavaScript too. This works especially well for platform features that are self-contained, like streams, or for features that are part of a “layered platform” of higher-level capabilities built on top of pre-existing lower-level ones. Although it’s always possible to run extra code at startup time to bootstrap embedder APIs (as is done in Node.js, for example), ideally embedders should be able to get the same speed benefits for their self-hosted APIs that V8 does.

V8 extras are a new feature of V8, as of our 4.8 release, designed with the goal of allowing embedders to write high-performance, self-hosted APIs via a simple interface. Extras are embedder-provided JavaScript files which are compiled directly into the V8 snapshot. They also have access to a few helper utilities that make it easier to write secure APIs in JavaScript.

An Example

A V8 extra file is simply a JavaScript file with a certain structure:

(function(global, binding, v8) {
'use strict';
const Object = global.Object;
const x = v8.createPrivateSymbol('x');
const y = v8.createPrivateSymbol('y');

class Vec2 {
constructor(theX, theY) {
this[x] = theX;
this[y] = theY;
}

norm() {
return binding.computeNorm(this[x], this[y]);
}
}

Object.defineProperty(global, 'Vec2', {
value: Vec2,
enumerable: false,
configurable: true,
writable: true
});

binding.Vec2 = Vec2;
});


There are a few things to notice here:
  • The global object is not present in the scope chain, so any access to it (such as that for Object) has to be done explicitly through the provided global argument.
  • The binding object is a place to store values for or retrieve values from the embedder. A C++ API v8::Context::GetExtrasBindingObject() provides access to the binding object from the embedder’s side. In our toy example, we let the embedder perform norm computation; in a real example you might delegate to the embedder for something trickier like URL resolution. We also add the Vec2 constructor to the binding object, so that embedder code can create Vec2 instances without going through the potentially-mutable global object.
  • The v8 object provides a small number of APIs to allow you to write secure code. Here we create private symbols to store our internal state in a way that cannot be manipulated from the outside. (Private symbols are a V8-internal concept and do not make sense in standard JavaScript code.) V8’s built-ins often use “%-function calls” for these sort of things, but V8 extras cannot use %-functions since they are an internal implementation detail of V8 and not suitable for embedders to depend on.
You might be curious about where these objects come from. All three of them are initialized in V8’s bootstrapper, which installs some basic properties but mostly leaves the initialization to V8’s self-hosted JavaScript. For example, almost every .js file in V8 installs something on global; see e.g. promise.js or uri.js. And we install APIs onto the v8 object in a number of places. (The binding object is empty until manipulated by an extra or embedder, so the only relevant code in V8 itself is when the bootstrapper creates it.)

Finally, to tell V8 that we’ll be compiling in an extra, we add a line to our project’s gypfile:

'v8_extra_library_files': ['./Vec2.js']

(You can see a real-world example of this in V8’s gypfile.)

V8 Extras in Practice

V8 extras provide a new and lightweight way for embedders to implement features. JavaScript code can more easily manipulate JavaScript built-ins like arrays, maps, or promises; it can call other JavaScript functions without ceremony; and it can deal with exceptions in an idiomatic way. Unlike C++ implementations, features implemented in JavaScript via V8 extras can benefit from inlining, and calling them does not incur any boundary-crossing costs. These benefits are especially pronounced when compared to a traditional bindings system like Chromium’s Web IDL bindings.

V8 extras were introduced and refined over the last year, and Chromium is currently using them to implement streams. Chromium is also considering V8 extras for implementing scroll customization and efficient geometry APIs.

V8 extras are still a work in progress, and the interface has some rough edges and disadvantages we hope to address over time. The primary area with room for improvement is the debugging story: errors are not easy to track down, and runtime debugging is most often done with print statements. In the future, we hope to integrate V8 extras into Chromium’s developer tools and tracing framework, both for Chromium itself and for any embedders that speak the same protocol.

Another cause for caution when using V8 extras is the extra developer effort required to write secure and robust code. V8 extras code operates directly on the snapshot, just like the code for V8’s self-hosted built-ins. It accesses the same objects as userland JavaScript, with no binding layer or separate context to prevent such access. For example, something as seemingly-simple as global.Object.prototype.hasOwnProperty.call(obj, 5) has six potential ways in which it could fail due to user code modifying the built-ins (count them!). Embedders like Chromium need to be robust against any user code, no matter its behavior, and so in such environments more care is necessary when writing extras than when writing traditional C++-implemented features.

If you’d like to learn more about V8 extras, check out our design document which goes into much more detail. We look forward to improving V8 extras, and adding more features that allow developers and embedders to write expressive, high-performance additions to the V8 runtime.

Posted by Domenic Denicola, Streams Sorcerer
2:17:00 PM

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