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Groups > comp.lang.forth > #41001
| From | "Alex McDonald" <blog@rivadpm.com> |
|---|---|
| Newsgroups | comp.lang.forth |
| Subject | Re: RfD: Quotations |
| Date | 2015-07-31 09:47 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <mpfckq$sh5$1@dont-email.me> (permalink) |
| References | (8 earlier) <mpbtv0$fm3$1@newsreader4.netcologne.de> <87k2timb98.fsf@jester.gateway.sonic.net> <mpcurt$2us$1@newsreader4.netcologne.de> <mpd0hq$l2h$1@dont-email.me> <mpd1kq$4vf$1@newsreader4.netcologne.de> |
on 30/07/2015 12:26:21, Bernd Linsel wrote:
> Am 30.07.2015 um 13:09 schrieb Alex McDonald:> on 30/07/2015 11:38:58,
> Bernd Linsel wrote: >> Am 30.07.2015 um 08:04 schrieb Paul Rubin:>
> Bernd Linsel <bl1@gmx.com> >> writes: >>> Perhaps it is clearer to
> require writing [: x y { x y } >> ... >> I'm still not lucky with
> this, while I reckon the >> copy-on-definition >> approach still
> sufficient. >>>
> >>> If I understand it, you're saying that at compile time, the { x y
> } >> in > the quotation should permanently allocate two cells in the
> global >>> dictionary. Then on entry into the quotation, x and y from
> the >> parent > are pushed to the D stack, then popped to be stored in
> those >> two > dictionary cells. Do I have that right?
> >>
> >> That would be a clumsy realization, yes.
> >>
> >> My example (and suggested syntax) is too complicated. I'll try
> again: >>
> >> : bar { x y -- xt }
> >> [: x dup y + to x + :] ; \ locals not needed (but possible)
> >>
> >> Accessing bar's x and y within the quotation makes them 'inherited'
> >> locals for the quotation and triggers copying them into the >>
> quotations' static frame. >>
> >> This makes sure that a reference to them stays valid, even when
> bar's >> invocation ends and the original x and y cease to exist.
> >>
> >
> > Is this even possible?
> >
> > It can't be done at compile time, since the values of X and Y aren't
> > known until run time. At run time, the values of X and Y aren't >
> available, since they are now out of scope when the quotation is
> executed > out of the scope of BAR.
> >
>
> Surely:
>
> The values aren't known, but the addresses relative to the frame
> pointer are.
>
> Remember that the parent must be executed to obtain an xt for the
> quotation. You place the initialization of the referenced local's copy
> into the parent's code, just where the quotation is defined in the
> source (the address of the static copied local's frame is probably
> somehow related to the quotation's xt, so calculating the correct
> address shouldn't be too hard). In the quotation's code, there must of
> course be a reference (initialization of a 'static frame pointer' or
> something in this way) to the same address. These addresses can be
> resolved by the compiler, as the frame is created when encountering
> the quotation during the compilation of the parent.
>
> --
> Best regards,
> Bernd
>
Let's take the example you gave.
: bar { x y -- xt } [: ( called Q below ) x dup y + to x + :] ;
10 20 bar execute
There are the following events; BAR-COMPILE when BAR is compiled,
Q-COMPILE when the quotation is compiled (a part of BAR-COMPILE and in
the scope of BAR), BAR-EXECUTE when BAR is executed and Q- EXECUTE when
the quotation is executed.
Here's the information available at each phase, and what you would need
to do to make this scheme work.
BAR-COMPILE: X and Y addresses are known (A(X) and A(Y)), but not the
values.
Q-COMPILE: Same information as BAR-COMPILE, since it is done in the
context of compiling BAR. Reserve slots for X and Y (X-SLOT and Y-SLOT)
in the execution environment for Q.
BAR-EXECUTE: X and Y now have definite values. BAR uses X-SLOT and Y-SLOT
slots in Q to copy the values in the future execution scope for
Q-EXECUTE.
Critically, we have to pass compile time information about locals and
local-SLOTs (A(X), A(Y), X-SLOT and Y-SLOT) from Q-COMPILE through to
BAR-EXECUTE. How would you propose implementing this?
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RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-28 21:22 +0100
Re: RfD: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-07-29 07:35 +0000
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-29 14:20 +0100
Re: RfD: Quotations Ron Aaron <rambamist@gmail.com> - 2015-07-29 13:44 +0300
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-29 13:42 +0100
Re: RfD: Quotations Raimond Dragomir <raimond.dragomir@gmail.com> - 2015-07-29 05:35 -0700
Re: RfD: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-07-29 13:34 +0000
Re: RfD: Quotations Raimond Dragomir <raimond.dragomir@gmail.com> - 2015-07-29 07:35 -0700
Re: RfD: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-07-29 15:05 +0000
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-29 16:19 +0100
Re: RfD: Quotations Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2015-07-29 21:48 +0100
Re: RfD: Quotations mhx@iae.nl - 2015-07-29 11:13 -0700
Re: RfD: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-07-30 13:04 +0000
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-29 15:07 +0100
Re: RfD: Quotations Raimond Dragomir <raimond.dragomir@gmail.com> - 2015-07-29 07:44 -0700
Re: RfD: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-07-29 15:12 +0000
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-29 16:18 +0100
Re: RfD: Quotations Bernd Linsel <bl1@gmx.com> - 2015-07-29 18:37 +0200
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-29 17:55 +0100
Re: RfD: Quotations "Elizabeth D. Rather" <erather@forth.com> - 2015-07-29 19:51 -0500
Re: RfD: Quotations Bernd Linsel <bl1@gmx.com> - 2015-07-30 03:31 +0200
Re: RfD: Quotations hughaguilar96@gmail.com - 2015-07-29 19:30 -0700
Re: RfD: Quotations Raimond Dragomir <raimond.dragomir@gmail.com> - 2015-07-29 21:19 -0700
Re: RfD: Quotations Raimond Dragomir <raimond.dragomir@gmail.com> - 2015-07-29 21:37 -0700
Re: RfD: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-07-30 11:45 +0000
Re: RfD: Quotations Raimond Dragomir <raimond.dragomir@gmail.com> - 2015-07-30 08:07 -0700
Re: RfD: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-07-31 10:54 +0000
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-31 12:48 +0100
Re: RfD: Quotations Raimond Dragomir <raimond.dragomir@gmail.com> - 2015-07-31 05:40 -0700
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-31 14:46 +0100
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-31 14:50 +0100
Re: RfD: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-07-31 14:46 +0000
Re: RfD: Quotations hughaguilar96@gmail.com - 2015-07-31 13:16 -0700
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-31 21:49 +0100
Re: RfD: Quotations hughaguilar96@gmail.com - 2015-07-29 22:42 -0700
Re: RfD: Quotations "Elizabeth D. Rather" <erather@forth.com> - 2015-07-30 08:46 -0500
Re: RfD: Quotations Raimond Dragomir <raimond.dragomir@gmail.com> - 2015-07-29 21:40 -0700
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-30 10:01 +0100
Re: RfD: Quotations Bernd Linsel <bl1@gmx.com> - 2015-07-30 12:00 +0200
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-30 11:10 +0100
Re: RfD: Quotations Coos Haak <chforth@hccnet.nl> - 2015-07-30 16:35 +0200
Re: RfD: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-07-29 16:53 +0000
Re: RfD: Quotations Bernd Linsel <bl1@gmx.com> - 2015-07-29 19:03 +0200
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-29 18:24 +0100
Re: RfD: Quotations Bernd Linsel <bl1@gmx.com> - 2015-07-30 01:38 +0200
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-30 09:10 +0100
Re: RfD: Quotations Bernd Linsel <bl1@gmx.com> - 2015-07-30 12:06 +0200
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-30 11:21 +0100
Re: RfD: Quotations Bernd Linsel <bl1@gmx.com> - 2015-07-30 14:00 +0200
Re: RfD: Quotations franck.bensusan@gmail.com - 2015-07-30 06:59 -0700
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-31 10:53 +0100
Re: RfD: Quotations Paul Rubin <no.email@nospam.invalid> - 2015-07-29 10:35 -0700
Re: RfD: Quotations Bernd Linsel <bl1@gmx.com> - 2015-07-30 01:45 +0200
Re: RfD: Quotations Bernd Linsel <bl1@gmx.com> - 2015-07-30 03:17 +0200
Re: RfD: Quotations hughaguilar96@gmail.com - 2015-07-29 19:21 -0700
Re: RfD: Quotations Paul Rubin <no.email@nospam.invalid> - 2015-07-29 23:04 -0700
Re: RfD: Quotations Bernd Linsel <bl1@gmx.com> - 2015-07-30 12:38 +0200
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-30 12:09 +0100
Re: RfD: Quotations Bernd Linsel <bl1@gmx.com> - 2015-07-30 13:26 +0200
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-31 09:47 +0100
Re: RfD: Quotations Raimond Dragomir <raimond.dragomir@gmail.com> - 2015-07-31 02:51 -0700
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-31 11:21 +0100
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-30 09:11 +0100
Re: RfD: Quotations Paul Rubin <no.email@nospam.invalid> - 2015-07-29 11:36 -0700
Re: RfD: Quotations Paul Rubin <no.email@nospam.invalid> - 2015-07-29 11:37 -0700
Re: RfD: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-07-30 13:07 +0000
Re: RfD: Quotations Bernd Linsel <bl1@gmx.com> - 2015-07-30 16:25 +0200
Re: RfD: Quotations mhx@iae.nl - 2015-07-29 11:16 -0700
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-29 20:27 +0100
Re: RfD: Quotations Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2015-07-29 21:57 +0100
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-29 22:48 +0100
Re: RfD: Quotations Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2015-07-31 12:34 +0100
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-31 13:00 +0100
Re: RfD: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-07-31 14:31 +0000
Re: RfD: Quotations mhx@iae.nl - 2015-07-31 11:32 -0700
Re: RfD: Quotations mhx@iae.nl - 2015-07-29 21:42 -0700
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-30 09:57 +0100
Re: RfD: Quotations hughaguilar96@gmail.com - 2015-07-29 17:21 -0700
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-30 09:56 +0100
Re: RfD: Quotations franck.bensusan@gmail.com - 2015-07-30 04:15 -0700
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-30 12:30 +0100
Re: RfD: Quotations franck.bensusan@gmail.com - 2015-07-30 05:04 -0700
Re: RfD: Quotations hughaguilar96@gmail.com - 2015-07-30 13:07 -0700
Re: RfD: Quotations hughaguilar96@gmail.com - 2015-07-29 16:52 -0700
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-30 09:53 +0100
Re: RfD: Quotations Bernd Paysan <bernd.paysan@gmx.de> - 2015-07-30 21:45 +0200
Re: RfD: Quotations hughaguilar96@gmail.com - 2015-07-30 13:25 -0700
Re: RfD: Quotations Julian Fondren <ayrnieu@gmail.com> - 2015-07-30 15:11 -0700
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-31 09:11 +0100
Re: RfD: Quotations Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2015-07-31 12:04 +0100
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-30 22:51 +0100
Re: RfD: Quotations hughaguilar96@gmail.com - 2015-07-30 22:38 -0700
Re: RfD: Quotations "Rod Pemberton" <boo@fasdfrewar.cdm> - 2015-07-31 02:10 -0400
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-31 09:01 +0100
Re: RfD: Quotations hughaguilar96@gmail.com - 2015-08-01 14:59 -0700
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-08-01 23:36 +0100
Re: RfD: Quotations Bernd Paysan <bernd.paysan@gmx.de> - 2015-08-02 01:19 +0200
Re: RfD: Quotations hughaguilar96@gmail.com - 2015-08-01 18:27 -0700
Re: RfD: Quotations hughaguilar96@gmail.com - 2015-08-09 14:34 -0700
Re: RfD: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-07-31 08:52 +0000
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-31 11:57 +0100
Re: RfD: Quotations Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2015-07-31 21:42 +0100
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-07-31 22:25 +0100
Re: RfD: Quotations Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2015-07-31 23:39 +0100
Re: RfD: Quotations Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2015-08-01 10:59 +0100
Re: RfD: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-08-01 14:18 +0000
Re: RfD: Quotations Bernd Paysan <bernd.paysan@gmx.de> - 2015-08-01 22:10 +0200
Re: RfD: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-08-02 05:36 +0000
Re: RfD: Quotations Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2015-08-03 16:40 +0100
Re: RfD: Quotations "Alex McDonald" <blog@rivadpm.com> - 2015-08-03 18:02 +0100
Re: RfD: Quotations Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2015-08-03 20:22 +0100
Re: RfD: Quotations Coos Haak <chforth@hccnet.nl> - 2015-08-04 02:10 +0200
Re: RfD: Quotations Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2015-08-04 08:49 +0100
Re: RfD: Quotations hughaguilar96@gmail.com - 2015-08-01 15:15 -0700
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