Hi Alistair, On Wed, Oct 17, 2018 at 9:28 AM Alistair Grant akgrant0710@gmail.com wrote:
Hi Eliot,
If I try to run Pharo with the latest VMMaker (eem.2460) it results in the following error in BitBltSimulator. Does this look familiar?
Yes. I am working on fixing a bug in BitBlt where the copyBits primitive accesses a word past the end of the source bitmap. If the source bitmap is an external surface and abuts the end of a page then accessing the word beyond the bitmap will cause an access violation and crash the VM. I have added asserts to catch the bug before it crashes the VM. Until I have the bug fixed you'll have to tolerate the assert fails. In the simulator you can use an exception handler to squash the asserts, e.g.
| sis m | sis := StackInterpreterSimulator newWithOptions: #(ObjectMemory Spur32BitMemoryManager). m := BitBltSimulation>>#copyBitsLockedAndClipped. sis desiredNumStackPages: 8. sis assertValidExecutionPointersAtEachStep: false. sis openOn: '/Users/eliot/Squeak/Squeak5.2/bitbltbug'. sis openAsMorph. [sis run] on: AssertionFailure do: [:ex| ex signalerContext sender sender sender sender sender method ~~ m ifTrue: [ex pass]. ex resume: nil]
HTH
Thanks,
Alistair
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