Same filter: OSX VST asserts, Win VST & All Standalones

Audio Plugins
1

I’ve got a fairly simple plugin - The main page has a Tab Component to allow me to switch between Parameter configuration / Main display modes.

Both the pages have a couple of sliders… nothing too clever (even for me!)

The app compiles and runs on PC and OSX - It works fine on PC (VST/Standalone) and as an AU and Standalone on OSX - However, when I use the VST version of the plugin on OSX, an assert is triggered while in the initial stages of scanning for VSTs:

{For clarity, I’m using Juce Audio Host (Debug build), but the same thing seems to be happening in Plogue Bidule Host }

#0	0x95fee402 in __pthread_kill
#1	0x95fee24f in pthread_kill
#2	0x9514a190 in Debugger
#3	0x000b285c in juce::ComponentDeletionWatcher::ComponentDeletionWatcher at juce_amalgamated.cpp:41757
#4	0x0015695f in juce::Component::setVisible at juce_amalgamated.cpp:38347
#5	0x15f0a5b0 in juce::Component::addAndMakeVisible at juce_amalgamated.cpp:39336
#6	0x15f3959f in juce::TabbedButtonBar::TabbedButtonBar at juce_amalgamated.cpp:59796
#7	0x15fb7533 in juce::TabCompButtonBar::TabCompButtonBar at juce_amalgamated.cpp:60166
#8	0x15f396e1 in juce::TabbedComponent::TabbedComponent at juce_amalgamated.cpp:60211
#9	0x15fcac8d in MainTabComponent::MainTabComponent at MainTabComponent.cpp:43
#10	0x15fc1ae7 in EditorComponent::EditorComponent at EditorComponent.cpp:96
#11	0x15fc5130 in JuceFilter::createEditor at JuceFilter.cpp:1283
#12	0x15e6a98b in juce::AudioProcessor::createEditorIfNeeded at juce_amalgamated.cpp:33794
#13	0x15fe4884 in JuceVSTWrapper::open at juce_VST_Wrapper.cpp:446
#14	0x15fe00de in AudioEffect::dispatcher at audioeffect.cpp:155
#15	0x15fe0dce in AudioEffectX::dispatcher at audioeffectx.cpp:297
#16	0x15fe66f9 in JuceVSTWrapper::dispatcher at juce_VST_Wrapper.cpp:1401
#17	0x15fe25a6 in AudioEffect::dispatchEffectClass at audioeffect.cpp:32
#18	0x00093606 in juce::VSTPluginInstance::dispatch at juce_amalgamated.cpp:32782
#19	0x000f6345 in juce::VSTPluginInstance::initialise at juce_amalgamated.cpp:31529
#20	0x0016f6a6 in juce::VSTPluginFormat::createInstanceFromDescription at juce_amalgamated.cpp:33492
#21	0x00111ffb in juce::VSTPluginFormat::findAllTypesForFile at juce_amalgamated.cpp:33399
#22	0x0011a03d in juce::KnownPluginList::scanAndAddFile at juce_amalgamated.cpp:27843
#23	0x0011a245 in juce::PluginDirectoryScanner::scanNextFile at juce_amalgamated.cpp:28303
#24	0x001a52a2 in juce::PluginListComponent::scanFor at juce_amalgamated.cpp:28585
#25	0x001a5646 in juce::PluginListComponent::timerCallback at juce_amalgamated.cpp:28518
#26	0x001c3cfd in juce::InternalTimerThread::handleMessage at juce_amalgamated.cpp:38040
#27	0x000cb5d0 in juce::MessageManager::deliverMessage at juce_amalgamated.cpp:37495
#28	0x001d9b28 in juce::AppDelegateRedirector::deliverMessage at juce_amalgamated.cpp:272357
#29	0x000e8d1a in -[JuceAppDelegate_1_46_2 customEvent:] at juce_amalgamated.cpp:272482
#30	0x92a039bc in __NSThreadPerformPerform
#31	0x90822595 in CFRunLoopRunSpecific
#32	0x90822c78 in CFRunLoopRunInMode
#33	0x92cbe28c in RunCurrentEventLoopInMode
#34	0x92cbe0a5 in ReceiveNextEventCommon
#35	0x92cbdf19 in BlockUntilNextEventMatchingListInMode
#36	0x962acd0d in _DPSNextEvent
#37	0x962ac5c0 in -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:]
#38	0x962a55fb in -[NSApplication run]
#39	0x00091ebb in juce::MessageManager::runDispatchLoop at juce_amalgamated.cpp:272519
#40	0x0015099c in juce::JUCEApplication::main at juce_amalgamated.cpp:16170
#41	0x00150c04 in juce::JUCEApplication::main at juce_amalgamated.cpp:16252
#42	0x00010331 in main at HostStartup.cpp:117

I thought it may be thread-related (somehow) - and I’m about to add a small debug to see what component names pop-up, in case that sheds any light on the matter… Smoke me a kipper!

Has anyone else experienced this? (or not had any problems with simple tabbed main page in an OSX VST?)

2

Slightly mystified by that… It looks like it’s complaining about the addAndMakeVisible in TabbedButtonBar::TabbedButtonBar(), but that code’s pretty simple and I can’t see anything wrong with it… Maybe you could step through it and see if there are any strange things happening?

3

Eppur non si muove

I must admit to not really knowing what’s going on… but it seems to think that the juce::TabAreabehindFrontButtonComponent isn’t an isValidMessageListener…

(I’m probably misunderstanding in the same way a cat doesn’t understand that it can’t be fed because the can-opener’s broken / or like a peasant thinks that the woman with the pointy-nose must be a witch, because she weighs the same as a duck…)

So, if I understand what the assert thinks is: The Tab component isn’t a valid component, because it’s been deleted from the list of valid message listeners and therefore wouldn’t detect someone clicking on it ! (HUH?)

[edit]Wonders if there’s a leak somewhere and my code’s got its BIG BOOTS on, and is stomping around on other objects’ data… after possibly detecting classic leaky-behaviour…

[edit] but hangon… this is all during the main constructor, and the only stuff that’s been going on is “news” and other constructors…

4

I can’t make any sense of it from the stack-trace… It’s the sort of bug you’d need to step through, looking for dodgy behaviour. Can’t think of any good suggestions of things to look for though…

5

This is looking more and more like my fault - (as you probly suspected :slight_smile: )
I still haven’t found the cause, but I think something of mine’s leaking