Avoid eager enqueueing from resolution

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

Index: pkg/compiler/lib/src/common/resolution.dart
diff --git a/pkg/compiler/lib/src/common/resolution.dart b/pkg/compiler/lib/src/common/resolution.dart
index 38b8d5c295be363c1bd1ae3757f297f922b4f6f5..474b10e743803d7a257c514d8f6a8e50eb0249f3 100644
--- a/pkg/compiler/lib/src/common/resolution.dart
+++ b/pkg/compiler/lib/src/common/resolution.dart
@@ -10,7 +10,8 @@ import '../compiler.dart' show
 import '../core_types.dart' show
     CoreTypes;
 import '../dart_types.dart' show
-    DartType;
+    DartType,
+    InterfaceType;
 import '../diagnostics/diagnostic_listener.dart' show
     DiagnosticReporter;
 import '../elements/elements.dart' show
@@ -20,7 +21,9 @@ import '../elements/elements.dart' show
     ErroneousElement,
     FunctionElement,
     FunctionSignature,
+    LocalFunctionElement,
     MetadataAnnotation,
+    MethodElement,
     TypedefElement,
     TypeVariableElement;
 import '../enqueue.dart' show
@@ -30,6 +33,10 @@ import '../tree/tree.dart' show
     AsyncForIn,
     Send,
     TypeAnnotation;
+import '../universe/universe.dart' show
+    UniverseSelector;
+import '../util/util.dart' show
+    Setlet;
 import 'registry.dart' show
     Registry;
 import 'work.dart' show
@@ -46,6 +53,7 @@ class ResolutionWorkItem extends WorkItem {
 
   WorldImpact run(Compiler compiler, ResolutionEnqueuer world) {
     WorldImpact impact = compiler.analyze(this, world);
+    impact = compiler.backend.resolutionCallbacks.transformImpact(impact);
     _isAnalyzed = true;
     return impact;
   }
@@ -53,8 +61,13 @@ class ResolutionWorkItem extends WorkItem {
   bool get isAnalyzed => _isAnalyzed;
 }
 
+// TODO(johnniwinther): Rename this to something like  `BackendResolutionApi`
+// and clean up the interface.
 /// Backend callbacks function specific to the resolution phase.
 class ResolutionCallbacks {
+  ///
+  WorldImpact transformImpact(ResolutionWorldImpact worldImpact) => worldImpact;
+
   /// Register that an assert has been seen.
   void onAssert(bool hasMessage, Registry registry) {}
 
@@ -133,6 +146,258 @@ class ResolutionCallbacks {
   void onIncDecOperation(Registry registry) {}
 }
 
+class ResolutionWorldImpact extends WorldImpact {
+  const ResolutionWorldImpact();
+
+  // TODO(johnniwinther): Remove this.
+  void registerDependency(Element element) {}
+
+  Iterable<Feature> get features => const <Feature>[];
+  Iterable<DartType> get requiredTypes => const <DartType>[];
+  Iterable<MapLiteralUse> get mapLiterals => const <MapLiteralUse>[];
+  Iterable<ListLiteralUse> get listLiterals => const <ListLiteralUse>[];
+  Iterable<DartType> get typeLiterals => const <DartType>[];
+  Iterable<String> get constSymbolNames => const <String>[];
+}
+
+/// A language feature seen during resolution.
+// TODO(johnniwinther): Should mirror usage be part of this?
+enum Feature {
+  /// Invocation of a generative construction on an abstract class.
+  ABSTRACT_CLASS_INSTANTIATION,
+  /// An assert statement with no message.
+  ASSERT,
+  /// An assert statement with a message.
+  ASSERT_WITH_MESSAGE,
+  /// A method with an `async` body modifier.
+  ASYNC,
+  /// An asynchronous for in statement like `await for (var e in i) {}`.
+  ASYNC_FOR_IN,
+  /// A method with an `async*` body modifier.
+  ASYNC_STAR,
+  /// A catch statement.
+  CATCH_STATEMENT,
+  /// A compile time error.
+  COMPILE_TIME_ERROR,
+  /// A fall through in a switch case.
+  FALL_THROUGH_ERROR,
+  /// A ++/-- operation.
+  INC_DEC_OPERATION,
+  /// A field whose initialization is not a constant.
+  LAZY_FIELD,
+  /// A call to `new Symbol`.
+  NEW_SYMBOL,
+  /// A catch clause with a variable for the stack trace.
+  STACK_TRACE_IN_CATCH,
+  /// String interpolation.
+  STRING_INTERPOLATION,
+  /// An implicit call to `super.noSuchMethod`, like calling an unresolved
+  /// super method.
+  SUPER_NO_SUCH_METHOD,
+  /// A redirection to the `Symbol` constructor.
+  SYMBOL_CONSTRUCTOR,
+  /// An synchronous for in statement, like `for (var e in i) {}`.
+  SYNC_FOR_IN,
+  /// A method with a `sync*` body modifier.
+  SYNC_STAR,
+  /// A throw expression.
+  THROW_EXPRESSION,
+  /// An implicit throw of a `NoSuchMethodError`, like calling an unresolved
+  /// static method.
+  THROW_NO_SUCH_METHOD,
+  /// An implicit throw of a runtime error, like
+  THROW_RUNTIME_ERROR,
+  /// The need for a type variable bound check, like instantiation of a generic
+  /// type whose type variable have non-trivial bounds.
+  TYPE_VARIABLE_BOUNDS_CHECK,
+}
+
+/// A use of a map literal seen during resolution.
+class MapLiteralUse {
+  final InterfaceType type;
+  final bool isConstant;
+  final bool isEmpty;
+
+  MapLiteralUse(this.type, {this.isConstant: false, this.isEmpty: false});
+
+  int get hashCode {
+    return
+        type.hashCode * 13 +
+        isConstant.hashCode * 17 +
+        isEmpty.hashCode * 19;
+  }
+
+  bool operator ==(other) {
+    if (identical(this, other)) return true;
+    if (other is! MapLiteralUse) return false;
+    return
+        type == other.type &&
+        isConstant == other.isConstant &&
+        isEmpty == other.isEmpty;
+  }
+}
+
+/// A use of a list literal seen during resolution.
+class ListLiteralUse {
+  final InterfaceType type;
+  final bool isConstant;
+  final bool isEmpty;
+
+  ListLiteralUse(this.type, {this.isConstant: false, this.isEmpty: false});
+
+  int get hashCode {
+    return
+        type.hashCode * 13 +
+        isConstant.hashCode * 17 +
+        isEmpty.hashCode * 19;
+  }
+
+  bool operator ==(other) {
+    if (identical(this, other)) return true;
+    if (other is! ListLiteralUse) return false;
+    return
+        type == other.type &&
+        isConstant == other.isConstant &&
+        isEmpty == other.isEmpty;
+  }
+}
+
+/// Mutable implementation of [WorldImpact] used to transform
+/// [ResolutionWorldImpact] to [WorldImpact].
+// TODO(johnniwinther): Remove [Registry] when dependency is tracked directly
+// on [WorldImpact].
+class TransformedWorldImpact implements WorldImpact, Registry {
+  final ResolutionWorldImpact worldImpact;
+
+  Setlet<Element> _staticUses;
+  Setlet<InterfaceType> _instantiatedTypes;
+  Setlet<UniverseSelector> _dynamicGetters;
+  Setlet<UniverseSelector> _dynamicInvocations;
+  Setlet<UniverseSelector> _dynamicSetters;
+
+  TransformedWorldImpact(this.worldImpact);
+
+  @override
+  Iterable<DartType> get asCasts => worldImpact.asCasts;
+
+  @override
+  Iterable<DartType> get checkedModeChecks => worldImpact.checkedModeChecks;
+
+  @override
+  Iterable<MethodElement> get closurizedFunctions {
+    return worldImpact.closurizedFunctions;
+  }
+
+  @override
+  Iterable<UniverseSelector> get dynamicGetters {
+    return _dynamicGetters != null
+        ? _dynamicGetters : worldImpact.dynamicGetters;
+  }
+
+  @override
+  Iterable<UniverseSelector> get dynamicInvocations {
+    return _dynamicInvocations != null
+        ? _dynamicInvocations : worldImpact.dynamicInvocations;
+  }
+
+  @override
+  Iterable<UniverseSelector> get dynamicSetters {
+    return _dynamicSetters != null
+        ? _dynamicSetters : worldImpact.dynamicSetters;
+  }
+
+  @override
+  Iterable<DartType> get isChecks => worldImpact.isChecks;
+
+  @override
+  Iterable<Element> get staticUses {
+    if (_staticUses == null) {
+      return worldImpact.staticUses;
+    }
+    return _staticUses;
+  }
+
+  @override
+  bool get isForResolution => true;
+
+  _unsupported(String message) => throw new UnsupportedError(message);
+
+  @override
+  Iterable<Element> get otherDependencies => _unsupported('otherDependencies');
+
+  // TODO(johnniwinther): Remove this.
+  @override
+  void registerAssert(bool hasMessage) => _unsupported('registerAssert');
+
+  @override
+  void registerDependency(Element element) {
+    worldImpact.registerDependency(element);
+  }
+
+  @override
+  void registerDynamicGetter(UniverseSelector selector) {
+    if (_dynamicGetters == null) {
+      _dynamicGetters = new Setlet<UniverseSelector>();
+      _dynamicGetters.addAll(worldImpact.dynamicGetters);
+    }
+    _dynamicGetters.add(selector);
+  }
+
+  @override
+  void registerDynamicInvocation(UniverseSelector selector) {
+    if (_dynamicInvocations == null) {
+      _dynamicInvocations = new Setlet<UniverseSelector>();
+      _dynamicInvocations.addAll(worldImpact.dynamicInvocations);
+    }
+    _dynamicInvocations.add(selector);
+  }
+
+  @override
+  void registerDynamicSetter(UniverseSelector selector) {
+    if (_dynamicSetters == null) {
+      _dynamicSetters = new Setlet<UniverseSelector>();
+      _dynamicSetters.addAll(worldImpact.dynamicSetters);
+    }
+    _dynamicSetters.add(selector);
+  }
+
+  @override
+  void registerGetOfStaticFunction(FunctionElement element) {
+    _unsupported('registerGetOfStaticFunction($element)');
+  }
+
+  @override
+  void registerInstantiation(InterfaceType type) {
+    // TODO(johnniwinther): Remove this when dependency tracking is done on
+    // the world impact itself.
+    registerDependency(type.element);
+    if (_instantiatedTypes == null) {
+      _instantiatedTypes = new Setlet<InterfaceType>();
+    }
+    _instantiatedTypes.add(type);
+  }
+
+  @override
+  Iterable<InterfaceType> get instantiatedTypes {
+    return _instantiatedTypes != null
+        ? _instantiatedTypes : const <InterfaceType>[];
+  }
+
+  @override
+  void registerStaticInvocation(Element element) {
+    // TODO(johnniwinther): Remove this when dependency tracking is done on
+    // the world impact itself.
+    registerDependency(element);
+    if (_staticUses == null) {
+      _staticUses = new Setlet<Element>();
+    }
+    _staticUses.add(element);
+  }
+
+  @override
+  Iterable<LocalFunctionElement> get closures => worldImpact.closures;
+}
+
 // TODO(johnniwinther): Rename to `Resolver` or `ResolverContext`.
 abstract class Resolution {
   Parsing get parsing;
@@ -145,6 +410,9 @@ abstract class Resolution {
   void resolveMetadataAnnotation(MetadataAnnotation metadataAnnotation);
   FunctionSignature resolveSignature(FunctionElement function);
   DartType resolveTypeAnnotation(Element element, TypeAnnotation node);
+
+  bool hasBeenResolved(Element element);
+  ResolutionWorldImpact analyzeElement(Element element);
 }
 
 // TODO(johnniwinther): Rename to `Parser` or `ParsingContext`.