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Bug 344521

Summary: ClassCastException when enabling Content Assist after comma
Product: [Tools] CDT Reporter: Marko Tomljenovic <marko.tomljenovic>
Component: cdt-parserAssignee: Markus Schorn <mschorn.eclipse>
Status: RESOLVED FIXED QA Contact: Anton Leherbauer <aleherb+eclipse>
Severity: normal    
Priority: P3 CC: batthish, cdtdoug
Version: 7.0.2   
Target Milestone: 8.0   
Hardware: PC   
OS: Windows XP   
Whiteboard:
Attachments:
Description Flags
Test project to reproduce exception none

Description Marko Tomljenovic CLA 2011-05-03 01:53:17 EDT 
Build Identifier: 7.0.2

In certain files and contexts a ClassCastException is thrown when I press Ctrl+Space directly after a comma (e.g. to enter the 2nd param of a function).
The the following exception is thrown:

java.lang.ClassCastException: org.eclipse.cdt.internal.core.dom.parser.c.CASTSimpleDeclSpecifier cannot be cast to org.eclipse.cdt.core.dom.ast.cpp.ICPPASTDeclSpecifier
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor.findDeclarationOwner(CPPVisitor.java:2399)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor.findNameOwner(CPPVisitor.java:2360)
	at org.eclipse.cdt.internal.core.dom.parser.ProblemBinding.getOwner(ProblemBinding.java:256)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.AccessContext.isAccessible(AccessContext.java:76)
	at org.eclipse.cdt.internal.ui.text.contentassist.DOMCompletionProposalComputer.computeCompletionProposals(DOMCompletionProposalComputer.java:138)
	at org.eclipse.cdt.internal.ui.text.contentassist.ParsingBasedProposalComputer.computeCompletionProposals(ParsingBasedProposalComputer.java:55)
	at org.eclipse.cdt.internal.ui.text.contentassist.CompletionProposalComputerDescriptor.computeCompletionProposals(CompletionProposalComputerDescriptor.java:300)
	at org.eclipse.cdt.internal.ui.text.contentassist.CompletionProposalCategory.computeCompletionProposals(CompletionProposalCategory.java:261)
	at org.eclipse.cdt.internal.ui.text.contentassist.ContentAssistProcessor.collectProposals(ContentAssistProcessor.java:270)
	at org.eclipse.cdt.internal.ui.text.contentassist.ContentAssistProcessor.computeCompletionProposals(ContentAssistProcessor.java:223)
	at org.eclipse.jface.text.contentassist.ContentAssistant.computeCompletionProposals(ContentAssistant.java:1834)
	at org.eclipse.jface.text.contentassist.CompletionProposalPopup.computeProposals(CompletionProposalPopup.java:556)
	at org.eclipse.jface.text.contentassist.CompletionProposalPopup.access$16(CompletionProposalPopup.java:553)
	at org.eclipse.jface.text.contentassist.CompletionProposalPopup$14.run(CompletionProposalPopup.java:1542)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.jface.text.contentassist.CompletionProposalPopup.incrementalComplete(CompletionProposalPopup.java:1536)
	at org.eclipse.jface.text.contentassist.ContentAssistant.showPossibleCompletions(ContentAssistant.java:1659)
	at org.eclipse.cdt.internal.ui.editor.CEditor$AdaptedSourceViewer.doOperation(CEditor.java:328)
	at org.eclipse.ui.texteditor.ContentAssistAction$1.run(ContentAssistAction.java:82)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.ui.texteditor.ContentAssistAction.run(ContentAssistAction.java:80)
	at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
	at org.eclipse.ui.commands.ActionHandler.execute(ActionHandler.java:185)
	at org.eclipse.ui.internal.handlers.LegacyHandlerWrapper.execute(LegacyHandlerWrapper.java:109)
	at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476)
	at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)
	at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169)
	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.executeCommand(WorkbenchKeyboard.java:468)
	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.press(WorkbenchKeyboard.java:786)
	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.processKeyEvent(WorkbenchKeyboard.java:885)
	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.filterKeySequenceBindings(WorkbenchKeyboard.java:567)
	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.access$3(WorkbenchKeyboard.java:508)
	at org.eclipse.ui.internal.keys.WorkbenchKeyboard$KeyDownFilter.handleEvent(WorkbenchKeyboard.java:123)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1253)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1052)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062)
	at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1103)
	at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1099)
	at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1508)
	at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:4270)
	at org.eclipse.swt.widgets.Canvas.WM_CHAR(Canvas.java:345)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:4162)
	at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:341)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4873)
	at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
	at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2459)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3655)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1408)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1384)

I will try to find a way how to reproduce it. Maybe in the meantime somebody has an idea why this exception happens.

Reproducible: Always
Comment 1 Marko Tomljenovic CLA 2011-05-03 02:26:01 EDT 
Created attachment 194550 [details]
Test project to reproduce exception

With the attached test project the exception can be reproduced:

1. Import the project as is ("Import existing project wizard")
2. Open file A16.5.c
3. Go to line 30, column 16
4. Press Ctrl+Space

Then the exception is thrown.
Comment 2 Markus Schorn CLA 2011-05-03 04:00:07 EDT 
(In reply to comment #1)
Thanks, I can reproduce the issue with:

void xxx( XXX *ptr) {
    func(ptr,
Comment 3 Markus Schorn CLA 2011-05-03 05:45:43 EDT 
Fixed in 8.0 > 20110503.
Comment 4 CDT Genie CLA 2011-05-03 06:23:02 EDT 
*** cdt cvs genie on behalf of mschorn ***
Bug 344521: ClassCastException during content assist.

[*] ProblemBinding.java 1.57 http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.cdt-core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/ProblemBinding.java?root=Tools_Project&r1=1.56&r2=1.57
Comment 5 Markus Schorn CLA 2011-09-06 08:40:57 EDT 
*** Bug 356523 has been marked as a duplicate of this bug. ***