bugGNU Octave - Bugs: bug #65308, bytecode interpreter: incorrect...


bug #65308: bytecode interpreter: incorrect number of output arguments

Submitter:  Fernando <tutissanalio>
Submitted:  Tue 13 Feb 2024 06:43:59 PM UTC
Category:  Interpreter Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Missed Error or Warning
Status:  None Assigned to:  None
Originator Name:  Open/Closed:  * Open
Release:  * dev Operating System:  * Any
Fixed Release:  None Planned Release:  None
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Thu 15 Feb 2024 09:32:20 PM UTC, comment #4: 

Yes, it solves the issue. Thank you.

Fernando <tutissanalio>
Wed 14 Feb 2024 11:04:00 PM UTC, comment #3: 

The attached patch should solve the issue. It was a more shallow problem than I thought.

Fix cs-list escape from matrix in bytecode interpreter (bug #65308)

A '{:}' expansion inside a matrix inside an anonymous function made
the cs-list escape the matrix when nargout was not 1, due to the
expansion inheriting the nargout value from the parent function.

Check the "special nargout -1" flag is not active, before pushing
any "inherit nargout from parent function" opcode.

* pt-bytecode-walk.cc: Chech flag
* bytecode_anon_handles.m: Add test

(file #55705)

Petter <petter>
Tue 13 Feb 2024 10:53:14 PM UTC, comment #2: 

I can reproduce it. I'll try to figure something out. There is https://savannah.gnu.org/bugs/?64783 too, so "anon function returns with cs-list" probably need some overhaul for the bytecode interpreter.

Petter <petter>
Tue 13 Feb 2024 06:46:43 PM UTC, comment #1: 

I forgot to specify in the title and description that this happens only with anonymous functions.

Fernando <tutissanalio>
Tue 13 Feb 2024 06:43:59 PM UTC, original submission:  

While investigating bug #64783, I found another bug in the bytecode interpreter, related to the number of output arguments.

>> __vm_enable__ (1)
>> f=@(x)[x{:}];
>> [a,b]=f({5,9})
a = 5
b = 9

Note that this should give an error (we are asking 2 outputs from f, but f should return only 1 output vector). Disabling the bytecode interpreter produces the correct result.

>> __vm_enable__ (0)
>> f=@(x)[x{:}];
>> [a,b]=f({5,9})
a =
   5   9

error: element number 2 undefined in return list

Fernando <tutissanalio>


(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attach Files:

Attached Files
file #55705:  octave_33192.patch added by petter (3KiB - text/plain)


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Items that depend on this one: None found


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    Follows 1 latest change.

    Date Changed by Updated Field Previous Value => Replaced by
    2024-02-14 petter Attached File- Added octave_33192.patch, #55705

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