Last night I had an vm crash as I was working on TK4, this is an unusual event so I'll bring it to everyone's attention. I recall I clicked on the squeak desktop and everything went away... This afternoon I'm still working with the image in question without issues. Lately we added some changes by Andreas for correct weak array handling, some changes to how become: works, and my work in VM GC statistical data, so I cann't say which is at fault, if any...

In looking I found that my 3.8.7b5 VM had crashed in updatePointersinRangeFromto() at 21777 via calling from primitiveArrayBecome.

21776 fieldOop = longAt(oop + fieldOffset); 21777 if (((fieldOop & 1) == 0) && (((longAt(fieldOop)) & MarkBit) != 0)) { Which resolves to this assembler, and we croak on the (lwz) load word zero high order bits at + 268 attempting to get the word at 0x3618bca2 (illegal)

+ 256 lwzx r2,r10,r11 3:1 Stall=2, Loop start[2] interp.c:21776 + 260 andi. r0,r2,0x0001 1:1 interp.c:21777 + 264 bne $+280 <updatePointersInRangeFromto + 544> 1:1 interp.c:21777 + 268 lwz r0,0(r2) 3:1 Stall=2 interp.c:21777 + 272 cmpwi cr6,r0,0 1:1 interp.c:21777 + 276 bge+ cr6,$+268 <updatePointersInRangeFromto + 544> 1:1 interp.c:21777

Host Name: ap0.smalltalkconsulting.net Date/Time: 2005-04-26 21:34:29 -0700 OS Version: 10.3.9 (Build 7W98) Report Version: 2

Command: Squeak VM Opt Path: /Users/johnmci/Documents/Squeak3.8.0/build/Squeak 3.8.7Beta5.app/Contents/MacOS/Squeak VM Opt Version: Squeak VM 3.8.7b5 (3.8.7b5) PID: 12999 Thread: 2

Exception: EXC_BAD_ACCESS (0x0001) Codes: KERN_INVALID_ADDRESS (0x0001) at 0x3618bca2

Thread 0: 0 libSystem.B.dylib 0x90007878 mach_msg_trap + 0x8 1 libSystem.B.dylib 0x900073f8 mach_msg + 0x38 2 com.apple.CoreFoundation 0x901c16e0 __CFRunLoopRun + 0x350 3 com.apple.CoreFoundation 0x901c5e6c CFRunLoopRunSpecific + 0x148 4 com.apple.HIToolbox 0x92885f60 RunCurrentEventLoopInMode + 0xac 5 com.apple.HIToolbox 0x9288c6c8 ReceiveNextEventCommon + 0x17c 6 com.apple.HIToolbox 0x928ae1a0 AcquireNextEventInMode + 0x48 7 com.apple.HIToolbox 0x928ab670 RunApplicationEventLoop + 0x88 8 org.squeak.Squeak 0x0006dab0 main + 0x390 9 org.squeak.Squeak 0x00009118 _start + 0x188 (crt.c:267) 10 dyld 0x8fe1a278 _dyld_start + 0x64

Thread 1: 0 libSystem.B.dylib 0x90018e18 semaphore_timedwait_signal_trap + 0x8 1 libSystem.B.dylib 0x9000e9d4 _pthread_cond_wait + 0x268 2 ...ple.CoreServices.CarbonCore 0x902da570 TSWaitOnSemaphoreCommon + 0xb0 3 ...ple.CoreServices.CarbonCore 0x902ee4f0 TimerThread + 0x3c 4 libSystem.B.dylib 0x90024910 _pthread_body + 0x28

Thread 2 Crashed: 0 org.squeak.Squeak 0x000c3f9c updatePointersInRangeFromto + 0x10c 1 org.squeak.Squeak 0x000c19fc becomewithtwoWaycopyHash + 0xfc 2 org.squeak.Squeak 0x000c1b00 primitiveArrayBecome + 0x30 3 org.squeak.Squeak 0x000ca840 interpret + 0x1af0 4 libSystem.B.dylib 0x90024910 _pthread_body + 0x28

PPC Thread State: srr0: 0x000c3f9c srr1: 0x0000d030 vrsave: 0x00000000 cr: 0x24000244 xer: 0x00000004 lr: 0x000c19fc ctr: 0x0000004e r0: 0x00000000 r1: 0xf0203d90 r2: 0x3618bca2 r3: 0x0000005c r4: 0x07348b6c r5: 0x00000160 r6: 0x4d616369 r7: 0x00107fc0 r8: 0x3a2f2f2f r9: 0x00000059 r10: 0x071b8734 r11: 0x00000138 r12: 0x00000008 r13: 0x00000000 r14: 0x00000000 r15: 0x00000000 r16: 0x00000000 r17: 0x00000000 r18: 0x00000000 r19: 0x00000000 r20: 0x00000000 r21: 0x054c962c r22: 0x07348530 r23: 0x07348510 r24: 0x00107fc0 r25: 0x000f1b18 r26: 0x00000001 r27: 0x00000001 r28: 0x00107fc0 r29: 0x00000004 r30: 0x07348b60 r31: 0x07348b58

Binary Images Description: 0x1000 - 0xebfff org.squeak.Squeak Squeak VM 3.8.7b5 (3.8.7b5) /Users/johnmci/Documents/Squeak3.8.0/build/Squeak 3.8.7Beta5.app/Contents/MacOS/Squeak VM Opt

Changes leading up to this VM are:

3.8.7b5 Fix logic to allow you to start VM from command line, changed sqMacFileLogic.c makeHFSFromPosixPath added to convert posix cmd line path names to HFS sqMacMain.c add logic to call cmd line parser sqMacUnixCommandLineInterface.c new file logic to parse cmd line sqMacUnixCommandLineInterface.h sqMacWindow.c minor changes to correct compiler errors

3.8.7b4/b3 Limited release for testing

3.8.7b2 sqUIEvents.c changed keyUp/keyDown to supply mac virtual keycode versus unicode, added new parm to keyChar to supply UTF-32 Unicode. As per Andreas request for Tweak.

3.8.7b1 sqUIEvents.c changed keyUp/keyDown logic to match Windows pattern, key repeat becomes keyDown/keyDown/keyUp

3.8.6b6 sqMacMIDI.c add #def so I can compile under code warrior os-9 again sqMacEncoding.c, sqMacEncoding.h Minor changes so I can compile user code warrior os-9 again sqMacUnixInterfaceSound.c Fix problem with empty buffer being full of junk under certain conditions, that causes a sharp sound bite.

3.8.6b5 Change to JMM & AR GC instrumentation patch, collect a few less statistics. Also change carbon VM to use Unix/Quartz sound driver which interfaces to Core Audio stuff.

3.8.6b4 Ensure VMMaker 3.8b2 - the VM code classes and tools for building a working vm for Squeak version > 3.8-6461. is incorporated. Add Andreas's GC improvement changes for * primitiveIsYoung: This answers the question whether an object currently lives in young or in old space.

* primitiveIsRoot: Answers the question whether any given object is currently a root for young space.

* primitiveRootTable: Answers a snapshot of the current root table. Useful to examine the roots table if the analysis requires complex other operations during which the root table might be modified itself. Note that since this primitive can cause GC there is a small chance that it will give an inaccurate answer.

* primitiveRootTableAt: Answers a single element of the root table (by one-based index). This primitive can be used to quickly scan the root table for certain objects.

* primitiveSetGCSemaphore: Indicates a semaphore (index) to be signaled whenever a garbage collection occurs. I can see at least two uses uses for the GC semaphore: running cleanup actions (for example after full GCs occured) and dynamic parameter tuning for the GC algorithm itself.

Add John's changes for

Smalltalk setGCBiasToGrowGCLimit: 16*1024*1024. "Set growth limit before full GC to 16MB"

Smalltalk setGCBiasToGrow: 1. Set bias to grow upto GCLimit, this can avoid a problem where we attempt to avoid growing but results in thousands of incremental GC events as we approach a knee in a curve of space used versus the growth/compaction decision.

3.8.6b3 Add in logic for become: to fix issues with changes to become: logic.

3.8.6b2 sqMacWindow.c reduce number of lock/unlock pixel events and flush no more than 91 fps, with flush check every 1/50 or 1/60 and 1/5 of a second. this shaves another 50% off making drawing pixels 1.3% of the time originally taken.

3.8.6b1 sqMacWindow.c, sqUIEvents.c, changed logic to flush screen every 125 fps, this makes pixel level drawing complete in 2% of the time originally taken.

3.8.5b1 Fix issue with gnuify. The offical gnu header file used a different #ifdef for the foo register than an altered gnu header file I was using for many years. This resulted in slower performance, which is fixed in 3.8.5 3.8.4b3 Support for GC statistical data and change to how memory is allocated and tenured. Additional statistical information from the GC routines Additional primitives to set GC semaphore, and to force a tenure

Change to make forward logic to look for "foo become: foo" and cause a prim failure. Earlier version of 3.8.4 where distributed to Ffenstri testers. sqMacHostWindow Change calls to move and size window to use GUILocker callbacks to avoid VM crash. sqMacWIndow.c Alter 1/2/4 bit support to pass in bit size of target window, then copy is more efficient.

3.8.3b3 Support for Host menus and windows. Also added back 1bit (B/W) and 2bit & 4bit color as requested by Dan Ingalls for os-x

Earlier versions of 3.8.0/1/2/3 were distributed to the TK4 team, not the public. sq.h Added events, EventTypeMenu, EventTypeWindow to handle menu and window events generated by the Host OS and placed on the Squeak Event Queue to be read by EventSensor sqGnu.h Switch to the current file used by Ian for Unix, versus older modified copy. sqMacExternalPrims.c Cleanup of warning message sqMacImageIO.c When you set the image name, we set the title on window 1. sqMacMain.c Do not create the main window until we actually use it. sqMacNSPlugin.c Always refer to window 1, not sure what it means to have other windows in the plugin yet... sqMacUIEvents.c OS-9 Pass cmd-key menu activity up Pass update event bounding box window events up Pass window activate events up Pass menu interaction activity up Pass window events, resize,zoom,close,move,inconize up OS-X Same as above getUIToLock needs to ReleaseEvent on the passed in event for GC reasons sqMacUIMenuBar.c disable edit menu at start, if later we find it enabled, don't touch, otherwise handle os-9 DA issues. sqmacWindow.c sqShowWindow now gets a windowIndex parm. ioShowDisplayOnWindow is added, with logic to build main window at first draw time, also fix some boundary checks, and provide support (again) for 1/2/4 bit color under os-x ioHasDisplayDepth() will return true for 1/2/4/8/16/32 bit color

-- ======================================================================== === John M. McIntosh johnmci@smalltalkconsulting.com 1-800-477-2659 Corporate Smalltalk Consulting Ltd. http://www.smalltalkconsulting.com ======================================================================== ===