Guard against exceptions thrown by linters (issue 27545)

pkg/analyzer/lib/src/task/dart.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.src.task.dart;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 3231 matching lines @@
     //
     // Prepare collectors.
     //
     RecordingErrorListener errorListener = new RecordingErrorListener();
     Source source = getRequiredSource();
     ErrorReporter errorReporter = new ErrorReporter(errorListener, source);
     //
     // Prepare inputs.
     //
     CompilationUnit unit = getRequiredInput(RESOLVED_UNIT_INPUT);
-
     //
     // Generate lints.
     //
     List<AstVisitor> visitors = <AstVisitor>[];
-
     bool timeVisits = analysisOptions.enableTiming;
     List<Linter> linters = getLints(context);
     int length = linters.length;
     for (int i = 0; i < length; i++) {
       Linter linter = linters[i];
       AstVisitor visitor = linter.getVisitor();
       if (visitor != null) {
         linter.reporter = errorReporter;
         if (timeVisits) {
           visitor = new TimedAstVisitor(visitor, lintRegistry.getTimer(linter));
         }
         visitors.add(visitor);
       }
     }
-
-    DelegatingAstVisitor dv = new DelegatingAstVisitor(visitors);
-    unit.accept(dv);
-
+    AstVisitor visitor = new ExceptionHandlingDelegatingAstVisitor(
+        visitors, ExceptionHandlingDelegatingAstVisitor.logException);
+    unit.accept(visitor);
     //
     // Record outputs.
     //
     outputs[LINTS] = errorListener.errors;
   }
 
   /**
    * Return a map from the names of the inputs of this kind of task to the task
    * input descriptors describing those inputs for a task with the
    * given [target].
@@ skipping 3158 matching lines @@
 
   @override
   bool moveNext() {
     if (_newSources.isEmpty) {
       return false;
     }
     currentTarget = _newSources.removeLast();
     return true;
   }
 }