Added some 'live debugging' - patches to improve error reporting for bugs that are very hard to reproduce.

src/eclipseAgent/lombok/eclipse/agent/EclipsePatcher.java

@@ -63,6 +63,7 @@ public class EclipsePatcher extends Agent {
 			patchCatchReparse(sm);
 			patchSetGeneratedFlag(sm);
 			patchHideGeneratedNodes(sm);
+			patchLiveDebug(sm);
 		}
 		
 		if (reloadExistingClasses) sm.reloadClasses(instrumentation);
@@ -165,6 +166,20 @@ public class EclipsePatcher extends Agent {
 				.transplant().build());
 	}
 	
+	/**
+	 * XXX LIVE DEBUG
+	 * 
+	 * Adds patches to improve error reporting in cases of extremely rare bugs that are hard to reproduce. These should be removed
+	 * once the issue has been solved!
+	 */
+	private static void patchLiveDebug(ScriptManager sm) {
+		sm.addScript(ScriptBuilder.exitEarly()
+				.target(new MethodTarget(
+						"org.eclipse.jdt.internal.compiler.ast.MethodDeclaration", "resolveStatements", "void"))
+				.decisionMethod(new Hook("lombok.eclipse.agent.PatchFixes", "debugPrintStateOfScope", "boolean", "java.lang.Object"))
+				.request(StackRequest.THIS).build());
+	}
+	
 	private static void patchAvoidReparsingGeneratedCode(ScriptManager sm) {
 		final String PARSER_SIG = "org.eclipse.jdt.internal.compiler.parser.Parser";
 		sm.addScript(ScriptBuilder.exitEarly()

src/eclipseAgent/lombok/eclipse/agent/PatchFixes.java

@@ -20,6 +20,26 @@ public class PatchFixes {
 		return (bits & ALREADY_PROCESSED_FLAG) != 0;
 	}
 	
+	/**
+	 * XXX LIVE DEBUG
+	 * 
+	 * Once in a blue moon eclipse throws a NullPointerException while editing a file. Can't reproduce it while running eclipse in a debugger,
+	 * but at least this way we patch the problem to be a bit more specific in the error that should then appear.
+	 */
+	public static boolean debugPrintStateOfScope(Object in) throws Exception {
+		/* this.scope.enclosingSourceType().sourceName */
+		Object scope = in.getClass().getField("scope").get(in);
+		String msg = null;
+		if (scope == null) msg = "scope itself is null";
+		else {
+			Object sourceTypeBinding = scope.getClass().getMethod("enclosingSourceType").invoke(scope);
+			if (sourceTypeBinding == null) msg = "scope.enclosingSourceType() is null";
+		}
+		
+		if (msg != null) throw new NullPointerException(msg);
+		return false;
+	}
+	
 	public static boolean skipRewritingGeneratedNodes(org.eclipse.jdt.core.dom.ASTNode node) throws Exception {
 		return ((Boolean)node.getClass().getField("$isGenerated").get(node)).booleanValue();
 	}