Re: WebAssembly and Bytecode question

Thanks John for the detailed explanation.

2016-01-25 21:59 GMT+02:00 John Henry <john@iamjohnhenry.com>:

> Hi Rahman,
>
> I think I see the confusion, so I'll try to clear it up. Hopefully, I
> don't create any more confusion.
>
> JavaScript, has traditionally been an interpreted language -- meaning that
> the engine reads code directly. From the diagram above, this would have
> looked like this:
>
> Java Source ------> Java Source AST -------> Java ByteCode
> JS Source
>
> This might be easier to reason about if we add "interpreters" to the
> diagram. Interpreters are the part of the code that reads code directly and
> preforms actions based on it.
>
> [Traditional Java]
> Java Source ------> Java Source AST -------> Java ByteCode => Bytecode
> Interpreter
>
> [Traditional JavaScript]
> JS Source => JS Interpreter
>
> When google introduced V8 as a just-in time compiler, JavaScript could now
> be compiled into binary code that can be read more efficiently by a
> computer, though as far as I can tell, this doesn't follow any standard and
> and is likely specific to the V8 Engine
>
> [JavaScript on Chrome]
> JS Source  ------> V8-Specific Binary Code => V8 Binary Interpreter
>
> I believe that other engines follow a similar pattern:
>
> [JavaScript on Edge]
> JS Source  ------> Chakra-Specific Binary Code => Chakra Binary
> Interpreter
>
> [JavaScript on Firefox]
> JS Source  ------> Spider-Monkey-Specific Binary Code => Spider Monkey
> Binary Interpreter
>
> The idea behind Web Assembly is not to act in the place of Java Source
> AST, but rather in the place of the source language (JavaScript) when the
> source language in the target for another language.
>
> JS Source  ------> Engine-Specific Binary Code => Engine Binary Interpreter
>
> WebAsembly  ------> Engine-Specific Binary Code => Engine Binary
> Interpreter
>
> This is easier to understand when you consider ASM.js, (http://asmjs.org/),
> a subset of JavaScript that's currently used as a compile target for other
> languages.
>
> Hopefully, it's also now clear that JavaScript isn't meant to compile to
> WebAssembly -- rather WebAssembly is way of running other languages in the
> browser by converting them into something that is more efficient than
> JavaScript.
>
> To revisit your original diagram,
>
> Java Source ------> Java Source AST -------> Java ByteCode
> JS Source   -------> WebAssembly    --------> ???
>
> "JS Source" should be replaced by any generic language that compiles to
> WebAssembly.
> "???" will not be a standard associated with WebAssembly, but rather
> binary code specific to the engine in which it's running.
>
> Java Source ------> Java Source AST -------> Java ByteCode
> {Generic Source}   -------> WebAssembly    -------->  Engine-Specific
> Binary Code.
>
> Best,
> -- John
>
> On Mon, Jan 25, 2016 at 11:38 AM, Rahman USTA <rahman.usta.88@gmail.com>
> wrote:
>
>> Thank you all so much, it is now more clear for me. WebAssembly has a
>> brilliant future 👍
>>
>> *Btw*: I'm Voxxed Days Istanbul <http://istanbul.voxxeddays.com/>
>> conference organizer. As Voxxed team We would be happy to see WebAssembly
>> talk at our event. If anyone interested to talk at our conference, we will
>> be happy :)
>>
>> Many thanks.
>>
>> 2016-01-25 21:06 GMT+02:00 Derek Schuff <dschuff@google.com>:
>>
>>>
>>>
>>> On Mon, Jan 25, 2016 at 10:42 AM Rahman USTA <rahman.usta.88@gmail.com>
>>> wrote:
>>>
>>>> Hi Jean;
>>>>
>>>> I'm a Java developer and I try to relate WebAssembly from my viewpoint
>>>> :)
>>>>
>>>> For example;
>>>>
>>>> Java Source ------> Java Source AST -------> Java ByteCode
>>>> JS Source   -------> WebAssembly    --------> ???
>>>>
>>>>
>>> It's more like:
>>> JS Source ---> (nothing, it still goes directly into the browser as
>>> source)
>>> C Source (or other languages in the future) -----> WebAssembly binary
>>> format (call it a bytecode if you want) ---> (goes into the browser as
>>> binary data)
>>>
>>>
>>>
>>
>>
>>
>> --
>> Rahman USTA
>> Istanbul JUG
>> https://github.com/rahmanusta <http://www.kodcu.com/>
>>
>
>


-- 
Rahman USTA
Istanbul JUG
https://github.com/rahmanusta <http://www.kodcu.com/>