Hi,
It seems you want to emulate pointer of integer.
Of all primitive types
In the JavaScript example there was no more integer typing.
That would be quite a slow down.
Is it?
I saw no speed difference between
var x = 1;
for (var i=0;i<100000;i++) x++;
and
var x = [1];
for (var i=0;i<100000;i++) x[0]++;
in Firefox. Perhaps more memory usage
Isn't speed the main idea of using pointers?
It would be to port all existing pascal code
Also what if var and @var are in different units?
Either it needs full program static analysis, or pointers are only
allowed to something that was used with a pointer in its unit
Local pointers (like var arguments) could always be changed to an array
when the address is taken, and copied back at the end of scope.
And what about pointer of pointer?
It becomes an array of arrays with the same construction
You may want to take a look at asm.js, which has a working
model for emulating pointers in JavaScript. It would be possible to add
a pas2js target for that. But then again there is webassembly
as well and it seems to have better support.
That model looks like quite a slow down
Cheers,
Benito
On 17.12.2017 22:24, Mattias Gaertner wrote:
On Sun, 17 Dec 2017 21:43:45 +0100
Benito van der Zander <ben...@benibela.de> wrote:
Hi,
Naturally, any memory pointer operation is not possible in Javascript.
Code that relies on this will not work.
it would be great, if pointers were added.
There are pointers already. For example references to class and
arrays.
It seems you want to emulate pointer of integer.
One trick would be to wrap every variable that is accessed by a pointer
in an array (or object).
That would be quite a slow down.
Isn't speed the main idea of using pointers?
Also what if var and @var are in different units?
And what about pointer of pointer?
You may want to take a look at asm.js, which has a working
model for emulating pointers in JavaScript. It would be possible to add
a pas2js target for that. But then again there is webassembly
as well and it seems to have better support.
Mattias
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