Opt-in to generate code for compile-time error. Only supported for SSA.

pkg/compiler/lib/src/compiler.dart

 // Copyright (c) 2012, 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.
 
 part of dart2js;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 284 matching lines @@
   }
   native.NativeEnqueuer nativeCodegenEnqueuer(world) {
     return new native.NativeEnqueuer();
   }
 
   /// Generates the output and returns the total size of the generated code.
   int assembleProgram();
 
   List<CompilerTask> get tasks;
 
-  bool get canHandleCompilationFailed;
-
   void onResolutionComplete() {}
   void onTypeInferenceComplete() {}
 
   ItemCompilationContext createItemCompilationContext() {
     return new ItemCompilationContext();
   }
 
   bool classNeedsRti(ClassElement cls);
   bool methodNeedsRti(FunctionElement function);
 
-  /// Register deferred loading. Returns `true` if the backend supports deferred
+  /// Enable compilation of code with compile time errors. Returns `true` if
+  /// supported by the backend.
+  bool enableCodegenWithErrorsIfSupported(Spannable node);
+
+  /// Enable deferred loading. Returns `true` if the backend supports deferred
   /// loading.
-  bool registerDeferredLoading(Spannable node, Registry registry);
+  bool enableDeferredLoadingIfSupported(Spannable node, Registry registry);
 
   /// Called during codegen when [constant] has been used.
   void registerCompileTimeConstant(ConstantValue constant, Registry registry) {}
 
   /// Called during resolution when a constant value for [metadata] on
   /// [annotatedElement] has been evaluated.
   void registerMetadataConstant(MetadataAnnotation metadata,
                                 Element annotatedElement,
                                 Registry registry) {}
 
@@ skipping 457 matching lines @@
   /// Temporary flag to enable `?.`, `??`, and `??=` until it becomes part of
   /// the spec.
   final bool enableNullAwareOperators;
 
   /// Output provider from user of Compiler API.
   api.CompilerOutputProvider userOutputProvider;
 
   /// Generate output even when there are compile-time errors.
   final bool generateCodeWithCompileTimeErrors;
 
+  /// The compiler is run from the build bot.
+  final bool testMode;
+
   bool disableInlining = false;
 
   List<Uri> librariesToAnalyzeWhenRun;
 
   Tracer tracer;
 
   CompilerTask measuredTask;
   Element _currentElement;
   LibraryElement coreLibrary;
   LibraryElement asyncLibrary;
@@ skipping 239 matching lines @@
             this.dumpInfo: false,
             this.showPackageWarnings: false,
             this.useContentSecurityPolicy: false,
             this.suppressWarnings: false,
             this.fatalWarnings: false,
             bool hasIncrementalSupport: false,
             this.enableExperimentalMirrors: false,
             this.allowNativeExtensions: false,
             this.enableNullAwareOperators: false,
             this.generateCodeWithCompileTimeErrors: false,
+            this.testMode: false,
             api.CompilerOutputProvider outputProvider,
             List<String> strips: const []})
       : this.disableTypeInferenceFlag =
           disableTypeInferenceFlag || !emitJavaScript,
         this.analyzeOnly =
             analyzeOnly || analyzeSignaturesOnly || analyzeAllFlag,
         this.analyzeSignaturesOnly = analyzeSignaturesOnly,
         this.analyzeAllFlag = analyzeAllFlag,
         this.hasIncrementalSupport = hasIncrementalSupport,
         cacheStrategy = new CacheStrategy(hasIncrementalSupport),
@@ skipping 548 matching lines @@
         }
         reportDiagnostic(null,
             kind.message({'warnings': info.warnings,
                           'hints': info.hints,
                           'uri': uri},
                          terseDiagnostics),
             api.Diagnostic.HINT);
       });
     }
 
-    // TODO(sigurdm): The dart backend should handle failed compilations.
-    if (compilationFailed && !backend.canHandleCompilationFailed) {
-      return;
+    if (compilationFailed){
+      if (!generateCodeWithCompileTimeErrors) return;
+      if (!backend.enableCodegenWithErrorsIfSupported(NO_LOCATION_SPANNABLE)) {
+        return;
+      }
     }
 
     if (analyzeOnly) {
       if (!analyzeAll && !compilationFailed) {
         // No point in reporting unused code when [analyzeAll] is true: all
         // code is artificially used.
         // If compilation failed, it is possible that the error prevents the
         // compiler from analyzing all the code.
         reportUnusedCode();
       }
@@ skipping 515 matching lines @@
       }
     }
     backend.forgetElement(element);
   }
 
   bool elementHasCompileTimeError(Element element) {
     return elementsWithCompileTimeErrors.contains(element);
   }
 
   EventSink<String> outputProvider(String name, String extension) {
-    if (compilationFailed) return new NullSink('$name.$extension');
+    if (compilationFailed) {
+      if (!generateCodeWithCompileTimeErrors || testMode) {
+        // Disable output in test mode: The build bot currently uses the time
+        // stamp of the generated file to determine whether the output is
+        // up-to-date.
+        return new NullSink('$name.$extension');
+      }
+    }
     return userOutputProvider(name, extension);
   }
 }
 
 class CompilerTask {
   final Compiler compiler;
   final Stopwatch watch;
   UserTag profilerTag;
 
   CompilerTask(Compiler compiler)
@@ skipping 320 matching lines @@
   InterfaceType streamType([DartType elementType]) {
     InterfaceType type = streamClass.computeType(compiler);
     if (elementType == null) {
       return streamClass.rawType;
     }
     return type.createInstantiation([elementType]);
   }
 }
 
 typedef void InternalErrorFunction(Spannable location, String message);