bugGNU Octave - Bugs: bug #65557, Byte-code interpreter does not...


bug #65557: Byte-code interpreter does not provide full (recursive) set of error information in some cases

Submitter:  Hendrik K <koerhen>
Submitted:  Fri 05 Apr 2024 04:43:09 AM UTC
Category:  Interpreter Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Missed Error or Warning
Status:  In Progress Assigned to:  None
Originator Name:  Open/Closed:  * Open
Release:  * bytecode-evaluator Operating System:  * GNU/Linux
Fixed Release:  None Planned Release:  None
* Mandatory Fields

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Wed 10 Apr 2024 05:57:14 PM UTC, comment #3: 

Thanks, OK, I've set Status to "In progress"

Philip Nienhuis <philipnienhuis>
Group Member
Tue 09 Apr 2024 09:08:40 PM UTC, comment #2: 

I've noticed this too and had already done a patch for it. The stack info is not set for the exception:s thrown (in the Octave sense, not C++ sense) by the bytecode interpreter itself, rather than by a call to C++ error().

However the patch is "stuck" between some wip-patches that addresses some design problems with how multiple return values are handled on the bytecode interpreter stack, so I think it could wait a bit to avoid some rebasing/rework and not put too many pending patches on the tracker.

I've attached the patch anyways to show the concept, however it shouldn't be apply-able straight off and is not tested that much.

(file #55932)

Petter <petter>
Fri 05 Apr 2024 06:12:51 PM UTC, comment #1: 

cc'ing Petter

Philip Nienhuis <philipnienhuis>
Group Member
Fri 05 Apr 2024 04:43:09 AM UTC, original submission:  

In certain cases the byte-code interpreter does not provide all information from a thrown error. Especially the line number of the root cause error may be missing (making debugging quite difficult).

Steps to reproduce with 2 function files

function ret = test1(in);
  in_1 = in * 2;
  if in_1 < 100
    ret = cos(in);
    ret = cos(in(2)); # causes error if "in" is a scalar

function ret = test2()
  ret = arrayfun(@(x) test1(x),1:200,'uni',false);

The thrown error message(s) do not show where the root cause error occurs and in which line:

>> test2()
error: in(2): out of bound 1 (dimensions are 1x1)

When the byte-code interpreter is deactivated (do not forget to clear test1 + test2), one sees the root cause error + line:

clear test1 test2;
error: in(2): out of bound 1 (dimensions are 1x1)
error: called from
    test1 at line 6 column 5
    test2>@<anonymous> at line 2 column 23
    test2 at line 2 column 3

Hendrik K <koerhen>


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Attach Files:

Attached Files
file #55932:  33551.patch added by petter (14KiB - text/plain)


Depends on the following items: None found

Items that depend on this one: None found


Carbon-Copy List
  • -email is unavailable- added by petter (Updated the item)
  • -email is unavailable- added by philipnienhuis
  • -email is unavailable- added by koerhen (Submitted the item)

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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2024-04-10 philipnienhuis StatusNone In Progress
    2024-04-09 petter Attached File- Added 33551.patch, #55932
    2024-04-05 philipnienhuis Carbon-Copy- Added petter

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