| CDT Ast Parser NPE [message #1841120] |
Tue, 04 May 2021 08:37  |
Eclipse User |
|
|
|
I am trying to develop a Eclipse plugin which is rewriting the AST of some .c source files.
Currently I am simply trying to add a simple statement once into a IFile (_file) obtained from a project of the active workspace. See the following code:
Map<String, String> definedSymbols = new HashMap<String, String>();
String[] includePaths = new String[0];
IScannerInfo info = new ScannerInfo(definedSymbols, includePaths);
IParserLogService log = new DefaultLogService();
IncludeFileContentProvider emptyIncludes = IncludeFileContentProvider.getEmptyFilesProvider();
int opts = 8;
final IASTTranslationUnit tu = GCCLanguage.getDefault().getASTTranslationUnit(FileContent.create(_file), info, emptyIncludes, null, opts, log);
final ASTRewrite rw = ASTRewrite.create(tu);
tu.accept(new ASTVisitor(true){
@Override
public int visit(IASTStatement statement){
if(once) {
once= false;
rw.insertBefore(statement.getParent(), statement, rw.createLiteralNode("int i = 3;"), null);
}
return PROCESS_CONTINUE;
}
});
Change c = rw.rewriteAST();
c.perform(new NullProgressMonitor());
The line:
Change c = rw.rewriteAST();
Results in a NPE:
Quote:
java.lang.NullPointerException
at org.eclipse.cdt.internal.formatter.ChangeFormatter.formatChangedCode(ChangeFormatter.java:95)
at org.eclipse.cdt.internal.core.dom.rewrite.changegenerator.ChangeGenerator.generateChange(ChangeGenerator.java:119)
at org.eclipse.cdt.internal.core.dom.rewrite.changegenerator.ChangeGenerator.generateChange(ChangeGenerator.java:107)
at org.eclipse.cdt.internal.core.dom.rewrite.ASTRewriteAnalyzer.rewriteAST(ASTRewriteAnalyzer.java:29)
at org.eclipse.cdt.core.dom.rewrite.ASTRewrite.rewriteAST(ASTRewrite.java:213)
at sheaperdexecuter.AstParser.parse(AstParser.java:155)
at sheaperdexecuter.parts.SheaperdView$3.mouseDown(SheaperdView.java:140)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:196)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4209)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1043)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4026)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3626)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1157)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1046)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:644)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:551)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:156)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)
at org.eclipse.equinox.launcher.Main.run(Main.java:1461)
at org.eclipse.equinox.launcher.Main.main(Main.java:1434)
I found similar problems online where 'Jonah Graham' helped, but the solution was to not run the code as Java application but inside an Eclipse plugin (or osgi framework in general).
Maybe someone can help and guide me to a solution.
(As I am a new user I cannot provide the SO links with the similar problems)
Regards,
JK
|
|
|
|
Powered by
FUDForum. Page generated in 0.04256 seconds
Home