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  1. Qt
  2. QTBUG-80589

Assigning a new QObject w/o a parent to a C++ property through QML doesn't prevent it from being garbage collected

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      A newly created QObject returned from a Q_INVOKABLE function that is bound to a property of a QObject derived class in QML and has no parent, is garbage collected while still being in use.

      See the attached example code.

      Environment
      Qt 5.13.1 (x86_64-little_endian-lp64 static release build; by Clang 10.0.0 (clang-1000.11.45.5) (Apple)) on "cocoa" 
OS: macOS Mojave (10.14) [darwin version 18.7.0]

Architecture: x86_64; features: SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 AVX AVX2 RTM HLE

Environment:

Features: QT_NO_EXCEPTIONS QT_NO_OPENSSL

Library info:
  PrefixPath: /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static
  DocumentationPath: /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static/doc
  HeadersPath: /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static/include
  LibrariesPath: /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static/lib
  LibraryExecutablesPath: /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static/libexec
  BinariesPath: /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static/bin
  PluginsPath: /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static/plugins
  ImportsPath: /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static/imports
  Qml2ImportsPath: /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static/qml
  ArchDataPath: /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static
  DataPath: /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static
  TranslationsPath: /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static/translations
  ExamplesPath: /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static/examples
  TestsPath: /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static/tests
  SettingsPath: /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static

Standard paths [*...* denote writable entry]:
  DesktopLocation: "Desktop" */Users/marcel.gotsch/Desktop*
  DocumentsLocation: "Documents" */Users/marcel.gotsch/Documents*
  FontsLocation: "Fonts" */Users/marcel.gotsch/Library/Fonts* /Library/Fonts /System/Library/Fonts
  ApplicationsLocation: "Applications" */Users/marcel.gotsch/Applications* /Applications
  MusicLocation: "Music" */Users/marcel.gotsch/Music*
  MoviesLocation: "Movies" */Users/marcel.gotsch/Movies*
  PicturesLocation: "Pictures" */Users/marcel.gotsch/Pictures*
  TempLocation: "Temporary Items" */private/var/folders/gw/0qbk28r94gl6rxnq0xklf6lc0000gp/T*
  HomeLocation: "Home" */Users/marcel.gotsch*
  AppLocalDataLocation: "Application Support" */Users/marcel.gotsch/Library/Application Support/QtProject/qtdiag* /Library/Application Support/QtProject/qtdiag /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static/bin
  CacheLocation: "Caches" */Users/marcel.gotsch/Library/Caches/QtProject/qtdiag* /Library/Caches/QtProject/qtdiag
  GenericDataLocation: "Application Support" */Users/marcel.gotsch/Library/Application Support* /Library/Application Support
  RuntimeLocation: "Application Support" */Users/marcel.gotsch/Library/Application Support*
  ConfigLocation: "Preferences" */Users/marcel.gotsch/Library/Preferences*
  DownloadLocation: "Downloads" */Users/marcel.gotsch/Downloads*
  GenericCacheLocation: "Caches" */Users/marcel.gotsch/Library/Caches* /Library/Caches /System/Library/Caches
  GenericConfigLocation: "Preferences" */Users/marcel.gotsch/Library/Preferences*
  AppDataLocation: "Application Support" */Users/marcel.gotsch/Library/Application Support/QtProject/qtdiag* /Library/Application Support/QtProject/qtdiag /Users/marcel.gotsch/Developer/repos/3rdparty/Qt/Qt-5.13.1-R1-macx-clang-static/bin
  AppConfigLocation: "Preferences" */Users/marcel.gotsch/Library/Preferences/QtProject/qtdiag*

File selectors (increasing order of precedence):
  en_US unix darwin mac osx macos

Network:
  Using "Secure Transport, macOS Mojave (10.14)", version: 0x0

Platform capabilities: ThreadedPixmaps OpenGL BufferQueueingOpenGL WindowMasks MultipleWindows ApplicationState ForeignWindows NonFullScreenWindows NativeWidgets WindowManagement RasterGLSurface ApplicationIcon

Style hints:
  mouseDoubleClickInterval: 400
  mousePressAndHoldInterval: 800
  startDragDistance: 10
  startDragTime: 500
  startDragVelocity: 0
  keyboardInputInterval: 400
  keyboardAutoRepeatRate: 30
  cursorFlashTime: 1000
  showIsFullScreen: 0
  showIsMaximized: 0
  passwordMaskDelay: 0
  passwordMaskCharacter: U+2022
  fontSmoothingGamma: 2
  useRtlExtensions: 0
  setFocusOnTouchRelease: 0
  tabFocusBehavior: Qt::TabFocusAllControls 
  singleClickActivation: 0

Additional style hints (QPlatformIntegration):
  ReplayMousePressOutsidePopup: 1

Theme:
  Platforms requested : cocoa
            available : 
  Styles requested    : macintosh
         available    : macintosh,Windows,Fusion
  System font         : ".SF NS Text" 13
  Native file dialog
  Native color dialog
  Native font dialog

Fonts:
  General font : ".SF NS Text" 13
  Fixed font   : "Monaco" 10
  Title font   : ".SF NS Text" 13
  Smallest font: ".SF NS Text" 9

Palette:
  QPalette::WindowText: #d8ffffff
  QPalette::Button: #ff323232
  QPalette::Light: #ff373737
  QPalette::Midlight: #ff343434
  QPalette::Dark: #ffbfbfbf
  QPalette::Mid: #ff232323
  QPalette::Text: #d8ffffff
  QPalette::BrightText: #ff373737
  QPalette::ButtonText: #ff000000
  QPalette::Base: #ff1e1e1e
  QPalette::Window: #ff323232
  QPalette::Shadow: #ff000000
  QPalette::Highlight: #ff3f638b
  QPalette::HighlightedText: #d8ffffff
  QPalette::Link: #ff0000ff
  QPalette::LinkVisited: #ffff00ff
  QPalette::AlternateBase: #ff989898
  QPalette::NoRole: #ff000000
  QPalette::ToolTipBase: #3fffffff
  QPalette::ToolTipText: #ff000000
  QPalette::PlaceholderText: #80ffffff

Screens: 2, High DPI scaling: inactive
# 0 "" Depth: 24 Primary: yes
  Manufacturer: 
  Model: 
  Serial number: 
  Geometry: 2560x1440+0+0 Available: 2560x1417+0+23
  Virtual geometry: 4480x1440-1920+0 Available: 4480x1417-1920+23
  2 virtual siblings
  Physical size: 599.3x340.242 mm  Refresh: 60 Hz Power state: 0
  Physical DPI: 108.5,107.5 Logical DPI: 72,72 Subpixel_RGB
  DevicePixelRatio: 2 Pixel density: 1
  Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0

# 1 "DELL P2217H" Depth: 24 Primary: no
  Manufacturer: 
  Model: 
  Serial number: 
  Geometry: 1920x1080-1920+174 Available: 1920x1057-1920+197
  Virtual geometry: 4480x1440-1920+0 Available: 4480x1417-1920+23
  2 virtual siblings
  Physical size: 478.118x266.33 mm  Refresh: 60 Hz Power state: 0
  Physical DPI: 102,103 Logical DPI: 72,72 Subpixel_RGB
  DevicePixelRatio: 1 Pixel density: 1
  Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0

LibGL Vendor: ATI Technologies Inc.
Renderer: AMD Radeon Pro 580 OpenGL Engine
Version: 2.1 ATI-2.11.21
Shading language: 1.20
Format: Version: 2.1 Profile: 0 Swap behavior: 2 Buffer size (RGB): 8,8,8
Profile: None (QOpenGLFunctions_5710346_1)

       

        1. Test.zip
          2 kB
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            qtqmlteam Qt Qml Team User
            marcel.gotsch Marcel Gotsch
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              Created:
              Updated:
              Resolved:

                There are no open Gerrit changes