Handle generic factory constructors in kernel_impact

R=het@google.com

Review URL: https://codereview.chromium.org/2341263002 .

pkg/compiler/lib/src/resolution/constructors.dart

@@ -619,7 +619,9 @@ class ConstructorResolver extends CommonResolverVisitor<ConstructorResult> {
     // This is not really resolving a type-annotation, but the name of the
     // constructor. Therefore we allow deferred types.
     DartType type = resolver.resolveTypeAnnotation(node,
-        malformedIsError: inConstContext, deferredIsMalformed: false);
+        malformedIsError: inConstContext,
+        deferredIsMalformed: false,
+        registerCheckedModeCheck: false);
     Send send = node.typeName.asSend();
     PrefixElement prefix;
     if (send != null) {

pkg/compiler/lib/src/resolution/members.dart

@@ -4063,11 +4063,13 @@ class ResolverVisitor extends MappingVisitor<ResolutionResult> {
   }
 
   DartType resolveTypeAnnotation(TypeAnnotation node,
-      {bool malformedIsError: false, bool deferredIsMalformed: true}) {
+      {bool malformedIsError: false,
+      bool deferredIsMalformed: true,
+      bool registerCheckedModeCheck: true}) {
     DartType type = typeResolver.resolveTypeAnnotation(this, node,
         malformedIsError: malformedIsError,
         deferredIsMalformed: deferredIsMalformed);
-    if (!type.isDynamic) {
+    if (registerCheckedModeCheck && !type.isDynamic) {
       registry.registerTypeUse(new TypeUse.checkedModeCheck(type));
     }
     return type;

pkg/compiler/lib/src/resolution/type_resolver.dart

@@ -176,7 +176,8 @@ class TypeResolver {
           } else {
             type = new InterfaceType(
                 cls.declaration, arguments.toList(growable: false));
-            addTypeVariableBoundsCheck = true;
+            addTypeVariableBoundsCheck =
+                arguments.any((DartType type) => !type.isDynamic);
           }
         }
       } else if (element.isTypedef) {
@@ -195,7 +196,8 @@ class TypeResolver {
             type = typdef.rawType;
           } else {
             type = new TypedefType(typdef, arguments.toList(growable: false));
-            addTypeVariableBoundsCheck = true;
+            addTypeVariableBoundsCheck =
+                arguments.any((DartType type) => !type.isDynamic);
           }
         }
       } else if (element.isTypeVariable) {

pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart

@@ -173,6 +173,10 @@ class KernelAstAdapter {
   DartType getDartType(ir.DartType type) {
     return type.accept(_typeConverter);
   }
+
+  List<DartType> getDartTypes(List<ir.DartType> types) {
+    return types.map(getDartType).toList();
+  }
 }
 
 class DartTypeConverter extends ir.DartTypeVisitor<DartType> {

pkg/compiler/lib/src/ssa/kernel_impact.dart

@@ -195,8 +195,44 @@ class KernelImpactBuilder extends ir.Visitor {
   void visitStaticInvocation(ir.StaticInvocation invocation) {
     _visitArguments(invocation.arguments);
     Element target = astAdapter.getElement(invocation.target).declaration;
-    impactBuilder.registerStaticUse(new StaticUse.staticInvoke(
-        target, astAdapter.getCallStructure(invocation.arguments)));
+    if (target.isFactoryConstructor) {
+      impactBuilder.registerStaticUse(new StaticUse.constructorInvoke(
+          target, astAdapter.getCallStructure(invocation.arguments)));
+      // TODO(johnniwinther): We should not mark the type as instantiated but
+      // rather follow the type arguments directly.
+      //
+      // Consider this:
+      //
+      //    abstract class A<T> {
+      //      factory A.regular() => new B<T>();
+      //      factory A.redirect() = B<T>;
+      //    }
+      //
+      //    class B<T> implements A<T> {}
+      //
+      //    main() {
+      //      print(new A<int>.regular() is B<int>);
+      //      print(new A<String>.redirect() is B<String>);
+      //    }
+      //
+      // To track that B is actually instantiated as B<int> and B<String> we
+      // need to follow the type arguments passed to A.regular and A.redirect
+      // to B. Currently, we only do this soundly if we register A<int> and
+      // A<String> as instantiated. We should instead register that A.T is
+      // instantiated as int and String.
+      ClassElement cls =
+          astAdapter.getElement(invocation.target.enclosingClass);
+      List<DartType> typeArguments =
+          astAdapter.getDartTypes(invocation.arguments.types);
+      impactBuilder.registerTypeUse(
+          new TypeUse.instantiation(new InterfaceType(cls, typeArguments)));
+      if (typeArguments.any((DartType type) => !type.isDynamic)) {
+        impactBuilder.registerFeature(Feature.TYPE_VARIABLE_BOUNDS_CHECK);
+      }
+    } else {
+      impactBuilder.registerStaticUse(new StaticUse.staticInvoke(
+          target, astAdapter.getCallStructure(invocation.arguments)));
+    }
   }
 
   @override

tests/compiler/dart2js/kernel/impact_test.dart

@@ -18,6 +18,8 @@ import '../serialization/test_helper.dart';
 
 const Map<String, String> SOURCE = const <String, String>{
   'main.dart': '''
+import 'helper.dart';
+
 main() {
   testEmpty();
   testNull();
@@ -58,6 +60,10 @@ main() {
   testInvokeIndexSet(null);
   testAssert();
   testAssertWithMessage();
+  testFactoryInvoke();
+  testFactoryInvokeGeneric();
+  testFactoryInvokeGenericRaw();
+  testFactoryInvokeGenericDynamic();
 }
 
 testEmpty() {}
@@ -154,7 +160,27 @@ testAssert() {
 testAssertWithMessage() {
   assert(true, 'ok');
 }
-'''
+testFactoryInvoke() {
+  new Class.fact();
+}
+testFactoryInvokeGeneric() {
+  new GenericClass<int, String>.fact();
+}
+testFactoryInvokeGenericRaw() {
+  new GenericClass.fact();
+}
+testFactoryInvokeGenericDynamic() {
+  new GenericClass<dynamic, dynamic>.fact();
+}
+''',
+  'helper.dart': '''
+class Class {
+  factory Class.fact() => null;
+}
+class GenericClass<X, Y> {
+  factory GenericClass.fact() => null;
+}
+''',
 };
 
 main(List<String> args) {