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Re: Did Lifeware Kill Scryer Prolog CLP(Z) ? (Was: A harsh wind is blowing into the face of Prolog now… [FORTRAN / TIOBE Index for May 2024])

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Hi,

Java had a grace period where it still supported
sharing through a command line option, but later
it was ditched completely:

Restriction: This system property is supported only on Java™ 8. String 
sharing cannot be enabled on Java 11 and later.

Start of content that applies only to Java 8 (LTS) Setting this property 
to true avoids sharing a String object when substring() is used to 
subset a String beginning from offset zero. Avoiding sharing is 
compatible with the Oracle HotSpot VM.
https://www.ibm.com/docs/en/sdk-java-technology/8?topic=options-djavalangstringsubstringnocopy

Unfortunately I don't find a document detailing
the decision. Like some JEP or so. Still searching.
With substring sharing it was very easy to provoke

an out of memory error. You could allocate large
strings. Share a UTF-16 character, i.e. substring of
length 1, in the middle of the string, and the string

was not garbage collected anymore. I do not exclude
that under the hood sharing could be used. But it
possibly needs to some compilation technique including

some dedicated analysis that determines that the parent
string stays reachable, so that the child sharing doesn't
make the parent string solely reachable, since

since the parent string is already reachable.

Bye

Mild Shock schrieb:
> Hi,
> 
> I do not exclude a turn-around possibility
> for Scryer Prolog. But with errors like this,
> that are at the core of some ideas behind
> 
> Scryer Prolog, like the glorious char based
> double quoted lists, which have special data
> structure support:
> 
> ?- [X,Y] = [e,foo], Z is X.
>     X = e, Y = foo, Z = 2.718281828459045.
> 
> ?- [X,Y] = [e,f], Z is X.
>     error(type_error(evaluable,e),(is)/2).
> 
> But I doubt that any such list/array ideas,
> especially when they try to share subarrays
> are even a good idea. Trealla Prolog tries
> 
> something similar. But initial Java had for
> example a sharing substring() method. But they
> abandoned that over the time. So their
> 
> strings are not sharing anymore, and code that
> relied on sharing got broken. You can have
> sharing through other interfaces, but Strings
> 
> are not anymore sharing. Any idea why?
> 
> Bye

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A harsh wind is blowing into the face of Prolog now… [FORTRAN / TIOBE Index for May 2024] Mild Shock <janburse@fastmail.fm> - 2024-05-27 19:58 +0200
  Re: A harsh wind is blowing into the face of Prolog now… [FORTRAN / TIOBE Index for May 2024] Mild Shock <janburse@fastmail.fm> - 2024-05-27 20:01 +0200
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  Did Lifeware Kill Scryer Prolog CLP(Z) ? (Was: A harsh wind is blowing into the face of Prolog now… [FORTRAN / TIOBE Index for May 2024]) Mild Shock <janburse@fastmail.fm> - 2024-07-26 15:38 +0200
    Re: Did Lifeware Kill Scryer Prolog CLP(Z) ? (Was: A harsh wind is blowing into the face of Prolog now… [FORTRAN / TIOBE Index for May 2024]) Mild Shock <janburse@fastmail.fm> - 2024-07-26 15:41 +0200
      Re: Did Lifeware Kill Scryer Prolog CLP(Z) ? (Was: A harsh wind is blowing into the face of Prolog now… [FORTRAN / TIOBE Index for May 2024]) Mild Shock <janburse@fastmail.fm> - 2024-07-27 11:27 +0200
        Re: Did Lifeware Kill Scryer Prolog CLP(Z) ? (Was: A harsh wind is blowing into the face of Prolog now… [FORTRAN / TIOBE Index for May 2024]) Mild Shock <janburse@fastmail.fm> - 2024-07-27 11:36 +0200
          Re: Did Lifeware Kill Scryer Prolog CLP(Z) ? (Was: A harsh wind is blowing into the face of Prolog now… [FORTRAN / TIOBE Index for May 2024]) Mild Shock <janburse@fastmail.fm> - 2024-07-27 11:52 +0200
            Re: Did Lifeware Kill Scryer Prolog CLP(Z) ? (Was: A harsh wind is blowing into the face of Prolog now… [FORTRAN / TIOBE Index for May 2024]) Mild Shock <janburse@fastmail.fm> - 2024-07-27 11:56 +0200
              Re: Did Lifeware Kill Scryer Prolog CLP(Z) ? (Was: A harsh wind is blowing into the face of Prolog now… [FORTRAN / TIOBE Index for May 2024]) Mild Shock <janburse@fastmail.fm> - 2024-07-27 12:04 +0200
                Re: Did Lifeware Kill Scryer Prolog CLP(Z) ? (Was: A harsh wind is blowing into the face of Prolog now… [FORTRAN / TIOBE Index for May 2024]) Mild Shock <janburse@fastmail.fm> - 2024-07-27 12:09 +0200
                Re: Did Lifeware Kill Scryer Prolog CLP(Z) ? (Was: A harsh wind is blowing into the face of Prolog now… [FORTRAN / TIOBE Index for May 2024]) Mild Shock <janburse@fastmail.fm> - 2024-07-27 12:54 +0200

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