[haiku-bugs] [Haiku] #9989: app server should not delete UtilityBitmap with delete
- From: "bonefish" <trac@xxxxxxxxxxxx>
- Date: Thu, 19 Sep 2013 16:19:41 -0000
#9989: app server should not delete UtilityBitmap with delete
--------------------------------+------------------------------
Reporter: bonefish | Owner: axeld
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: Servers/app_server | Version: R1/Development
Keywords: | Blocked By:
Blocking: | Has a Patch: 0
Platform: All |
--------------------------------+------------------------------
When building libbe with `DEBUG=1` the app server runs into the following
assertion:
{{{
418: DEBUGGER: Deleted referenceable object that's not on the stack (this:
0x400ddc8, stack_base: 0x688c7000, stack_end: 0x68907000)
debug_server: Thread 418 entered the debugger: Debugger call: `Deleted
referenceable object that's not on the stack (this: 0x400ddc8, stack_base:
0x688c7000, stack_end: 0x68907000)
'
stack trace, current PC 0x63356114 commpage_syscall + 0x4:
(0x68905da0) 0x17133fd _ZN14BReferenceableD2Ev + 0x129
(0x68905f20) 0x127f79e _ZN12ServerBitmapD2Ev + 0x80
(0x68905f50) 0x127f822 _ZN13UtilityBitmapD1Ev + 0x26
(0x68905f70) 0x127f846 _ZN13UtilityBitmapD0Ev + 0x1c
(0x68905f90) 0x125e315 _ZN19BitmapDrawingEngine7SetSizeEll + 0xfb
(0x68905ff0) 0x129e836
_ZN16DefaultDecorator19_GetBitmapForButtonEPN9Decorator3TabENS_9ComponentEbll
+ 0x14a
(0x689060a0) 0x129ebba
_ZN16DefaultDecorator9_DrawZoomEPN9Decorator3TabEb5BRect + 0xbc
(0x68906110) 0x129dbeb
_ZN16DefaultDecorator11DrawButtonsEPN9Decorator3TabERK5BRect + 0xd3
(0x68906180) 0x129f2f2
_ZN16DefaultDecorator8_DrawTabEPN9Decorator3TabE5BRect + 0x462
(0x68906300) 0x129caa4 _ZN9Decorator9_DrawTabsE5BRect + 0xc0
(0x68906360) 0x129d31b _ZN16DefaultDecorator4DrawE5BRect + 0x6b
(0x689063a0) 0x1294e5a _ZN6Window11_DrawBorderEv + 0xee
(0x689063f0) 0x12966c9 _ZN6Window17RedrawDirtyRegionEv + 0x5b
(0x68906430) 0x128e701 _ZN12ServerWindow14_MessageLooperEv + 0x221
(0x689064c0) 0x12725ff _ZN13MessageLooper15_message_threadEPv + 0xf
(0x689064e0) 0xde7947 thread_entry + 0x1c
}}}
`BitmapDrawingEngine::SetSize()` deletes a `UtilityBitmap`, which is a
`BReferenceable`, object with the `delete` operator. The reference count
is 1, so that the assertion in the `BReferenceable` destructor is
triggered.
Since it is impossible for the check to know whether this is erroneous use
-- and the check itself is quite useful -- something else needs to be
changed. One thing that comes to mind is using `ReleaseReference()`
instead. Adding a `Delete()` method which could check the reference count,
might be even nicer. Not sure, if adding a private `delete` operator would
be possible to explicitly prevent it from being called.
--
Ticket URL: <http://dev.haiku-os.org/ticket/9989>
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