0000478: warpbit bug invoked by simple etoy program

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Category

Severity

Reproducibility

Date Submitted

Last Update

0000478

[Squeak] Kernel

major

always

10-31-04 21:07

11-08-04 23:34

Reporter

wiz

View Status

public

Assigned To

ned

Priority

normal

Resolution

fixed

Status

closed

Product Version

Summary

0000478: warpbit bug invoked by simple etoy program

Description

Get a rectangle. Get a viewer.
Create a one line script.
rectangle's left := rectangle's left + 1 / 2.

Executing the script will throw squeak into the emergency evaluator.

Additional Information

Warp bit chokes on the fractional co-ordinate created.
And of course it chokes again when trying to display the invalid rectangle. (that is where the emergency evaluator gets invoked as an error recovery error.)

The bug won't happen if script
rectangle's x := rectangle's x + 1 / 2.
is run first because that will change the coords to floats not integers. And once the numbers are floats warpbit can proceed.

The first encounter of the difficulty is handled by throwing up an error: error: warbit foobaz fraction etc. error box then the next attempt to display the screen throws up the emergency stuff.

So I suspect one part of the solution is to make invalid rectangle drawing a little more robust. In this case by insuring the coordinates are something simple e.g intergers or floats.

Also what is the story for etoy behavior should it let coords be forced to floats or kept integer?

The bug has been present all along and was still present in squeak3.7-5988 full.

Attached Files

mouseBuster.gif [^] (3,492 bytes) 10-31-04 21:07

CoordGuard-nk.1.cs [^] (1,004 bytes) 11-03-04 20:09

Relationships

child of

0007323

closed

A mother for bugs and problems with Fractions.

Notes
(0000569 - 21 - 21 - 21 - 121 - 121 - 121) wiz 10-31-04 21:12	See also bug 0000457

(0000594 - 60 - 66 - 66 - 66 - 66 - 66) ned 11-03-04 20:10	Attached CS guards Morph>>position: and avoids this problem.

(0000623 - 29 - 29 - 29 - 29 - 29 - 29) MarcusDenker 11-08-04 23:34	added as 6357CoordGuard-nk.cs

Issue History
Date Modified	Username	Field	Change
10-31-04 21:07	wiz	New Issue
10-31-04 21:07	wiz	File Added: mouseBuster.gif
10-31-04 21:12	wiz	Note Added: 0000569
11-03-04 20:09	ned	Status	new => assigned
11-03-04 20:09	ned	Assigned To	=> ned
11-03-04 20:09	ned	File Added: CoordGuard-nk.1.cs
11-03-04 20:10	ned	Status	assigned => resolved
11-03-04 20:10	ned	Resolution	open => fixed
11-03-04 20:10	ned	Note Added: 0000594
11-08-04 23:34	MarcusDenker	Status	resolved => closed
11-08-04 23:34	MarcusDenker	Note Added: 0000623
03-28-09 01:06	wiz	Relationship added	child of 0007323

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