[Cuis-dev] copyBitsLockedAndClipped

[Francisco Garau]

Playing with my son we opened many Sample04Pacman morphs and moving one of
them over the others we got the Squeak 5.0 VM to become unresponsive.

[image: Screenshot 2024-03-05 at 19.04.31.jpg]

Sampling the VM, shows the copyBitsLockedAndClipped as the possible
culprit.

Analysis of sampling Squeak (pid 3794) every 1 millisecond
Process:         Squeak [3794]
Path:            /Users/USER/*/CuisVM.app/Contents/MacOS/Squeak
Load Address:    0x10af30000
Identifier:      org.squeak.Squeak
Version:         5.20231218.1441 (5.20231218.1441)
Code Type:       X86-64
Platform:        macOS
Parent Process:  bash [3793]

Date/Time:       2024-03-05 18:45:03.504 +0000
Launch Time:     2024-03-05 18:33:54.919 +0000
OS Version:      macOS 14.3.1 (23D60)
Report Version:  7
Analysis Tool:   /usr/bin/sample

Physical footprint:         4.1G
Physical footprint (peak):  4.1G
Idle exit:                  untracked
----

Call graph:
    2129 Thread_5154206   DispatchQueue_1: com.apple.main-thread  (serial)
    + 1437 start  (in dyld) + 1942  [0x7ff80df99386]
    + ! 1437 NSApplicationMain  (in AppKit) + 816  [0x7ff8119d41c1]
    + !   1437 -[NSApplication run]  (in AppKit) + 603  [0x7ff811a001b2]
    + !     1437 -[NSApplication(NSEventRouting)
_nextEventMatchingEventMask:untilDate:inMode:dequeue:]  (in AppKit) + 1304
 [0x7ff812318804]
    + !       1437 _DPSNextEvent  (in AppKit) + 880  [0x7ff811a0ec39]
    + !         1437 _BlockUntilNextEventMatchingListInModeWithFilter  (in
HIToolbox) + 66  [0x7ff818cf0531]
    + !           1437 ReceiveNextEventCommon  (in HIToolbox) + 201
 [0x7ff818cf0616]
    + !             1437 RunCurrentEventLoopInMode  (in HIToolbox) + 292
 [0x7ff818cf09d9]
    + !               1437 CFRunLoopRunSpecific  (in CoreFoundation) + 557
 [0x7ff80e3fe082]
    + !                 1437 __CFRunLoopRun  (in CoreFoundation) + 850
 [0x7ff80e3fe99c]
    + !                   1437 __CFRunLoopDoObservers  (in CoreFoundation)
+ 493  [0x7ff80e3ff41a]
    + !                     1437
__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__  (in
CoreFoundation) + 23  [0x7ff80e3ff4f6]
    + !                       1437 __NSFirePerformWithOrder  (in
Foundation) + 357  [0x7ff80f4583fc]
    + !                         1437 -[sqSqueakMainApplication runSqueak]
 (in Squeak) + 381  [0x10afceb33]
    + !                           1437 interpret  (in Squeak) + 867
 [0x10af37bf1]
    + !                             995 ???  (in <unknown binary>)
 [0x116c063e8]
    + !                             : 988 primitiveCopyBits  (in Squeak) +
39  [0x10afdf1e7]
    + !                             : | 988 copyBits  (in Squeak) + 42
 [0x10afded28]
    + !                             : |   988 copyBitsLockedAndClipped  (in
Squeak) + 2867,2861,...  [0x10afe2799,0x10afe2793,...]
    + !                             : 4 primitiveCopyBits  (in Squeak) + 29
 [0x10afdf1dd]
    + !                             : | 2 loadBitBltFromwarping  (in
Squeak) + 538,695  [0x10afe5c25,0x10afe5cc2]
    + !                             : | 1 loadBitBltFromwarping  (in
Squeak) + 214  [0x10afe5ae1]
    + !                             : | + 1 isPointers  (in Squeak) + 0
 [0x10af5cc4b]
    + !                             : | 1 loadBitBltFromwarping  (in
Squeak) + 1885  [0x10afe6168]
    + !                             : |   1 isWordsOrBytes  (in Squeak) +
17  [0x10af5cd22]
    + !                             : 1 primitiveCopyBits  (in Squeak) + 61
 [0x10afdf1fd]
    + !                             : | 1 statNumGCs  (in Squeak) + 18
 [0x10af62047]
    + !                             : 1 primitiveCopyBits  (in Squeak) +
111  [0x10afdf22f]
    + !                             : | 1 showDisplayBitsLeftTopRightBottom
 (in Squeak) + 47  [0x10af676da]
    + !                             : 1 primitiveCopyBits  (in Squeak) +
175  [0x10afdf26f]
    + !                             :   1 methodReturnReceiver  (in Squeak)
+ 1  [0x10af64819]
    + !                             96 ???  (in <unknown binary>)
 [0x116c13a94]
    + !                             : 60 primitivePerform  (in Squeak) +
267  [0x10af6b8d8]
    + !                             : | 36 executeNewMethod  (in Squeak) +
91  [0x10af4ac77]
    + !                             : | + 23 slowPrimitiveResponse  (in
Squeak) + 121  [0x10af7b65f]
    + !                             : | + ! 5 primitiveSmallFloatAdd  (in
Squeak) + 0,23,...  [0x10af75afc,0x10af75b13,...]
    + !                             : | + ! 5 primitiveSmallFloatDivide
 (in Squeak) + 181,0,...
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