Made dart2js constructor lookup logic "private"-aware, fixed 4740 bug.

lib/compiler/implementation/resolver.dart

Index: lib/compiler/implementation/resolver.dart
diff --git a/lib/compiler/implementation/resolver.dart b/lib/compiler/implementation/resolver.dart
index 3de67b305322f456a1d5ef3c13fef8c238b0f5ca..b74185bcb304c73be4c5a3a6015543b898bf211f 100644
--- a/lib/compiler/implementation/resolver.dart
+++ b/lib/compiler/implementation/resolver.dart
@@ -85,12 +85,16 @@ class ResolverTask extends CompilerTask {
     });
   }
 
-  SourceString getConstructorName(Send node) {
-    if (node.receiver !== null) {
-      return node.selector.asIdentifier().source;
-    } else {
-      return const SourceString('');
-    }
+  bool isNamedConstructor(Send node) => node.receiver !== null;
+  SourceString getConstructorName(Send node) => node.selector.asIdentifier().source;

[kasperl, 2012/09/28 08:48:54]

Line a bit too long.

+
+  String createConstructorFullName(SourceString className,
+                                   SourceString constructorName) {
+    String classNameString = className.slowToString();
+    String constructorNameString = constructorName.slowToString();
+    return (constructorName === const SourceString(''))
+           ? classNameString

[kasperl, 2012/09/28 08:48:54]

4 space indent.

+           : "$classNameString.$constructorNameString";
   }
 
   FunctionElement resolveConstructorRedirection(FunctionElement constructor) {
@@ -102,10 +106,18 @@ class ResolverTask extends CompilerTask {
     if (!initializers.isEmpty() &&
         Initializers.isConstructorRedirect(initializers.head)) {
       final ClassElement classElement = constructor.getEnclosingClass();
-      final SourceString constructorName =
-          getConstructorName(initializers.head);
-      final SourceString className = classElement.name;
-      return classElement.lookupConstructor(className, constructorName);
+      Selector selector;
+      if (isNamedConstructor(initializers.head)) {
+        SourceString constructorName = getConstructorName(initializers.head);
+        selector = new Selector.callConstructor(classElement.name,
+                                                constructorName,
+                                                constructor.getLibrary());

[kasperl, 2012/09/28 08:48:54]

I'm still a bit worried about computing the library from different elements. As
a next CL someone should probably try to add a helper to the resolver that
creates these selectors using the library the resolver is current working in.

+      } else {
+        selector = new Selector.callDefaultConstructor(
+            classElement.name,
+            constructor.getLibrary());
+      }
+      return classElement.lookupConstructor(selector);
     }
     return null;
   }
@@ -202,8 +214,9 @@ class ResolverTask extends CompilerTask {
     } else {
       name = constructor.name;
     }
-    constructor.defaultImplementation = defaultClass.lookupConstructor(name);
-
+    constructor.defaultImplementation = defaultClass.lookupConstructor(
+        new Selector.callDefaultConstructor(name,
+                                            defaultClass.getLibrary()));
     if (constructor.defaultImplementation === null) {
       // We failed to find a constructor named either
       // "MyInterface.name" or "MyClass.name".
@@ -553,6 +566,21 @@ class InitializerResolver {
     visitor.visitInStaticContext(init.arguments.head);
   }
 
+  ClassElement getSuperOrThisLookupTarget(FunctionElement constructor,
+                                          bool isSuperCall,
+                                          Node diagnosticNode) {
+    ClassElement lookupTarget = constructor.getEnclosingClass();
+    if (isSuperCall) {
+      // Calculate correct lookup target and constructor name.
+      if (lookupTarget === visitor.compiler.objectClass) {
+        error(diagnosticNode, MessageKind.SUPER_INITIALIZER_IN_OBJECT);
+      } else {
+        lookupTarget = lookupTarget.supertype.element;
+      }
+    }
+    return lookupTarget;
+  }
+
   Element resolveSuperOrThisForSend(FunctionElement constructor,
                                     FunctionExpression functionNode,
                                     Send call) {
@@ -564,12 +592,41 @@ class InitializerResolver {
     });
     Selector selector = visitor.mapping.getSelector(call);
     bool isSuperCall = Initializers.isSuperConstructorCall(call);
-    SourceString constructorName = resolver.getConstructorName(call);
-    Element result = resolveSuperOrThis(
-        constructor, isSuperCall, false, constructorName, selector, call);
-    visitor.useElement(call, result);
-    visitor.world.registerStaticUse(result);
-    return result;
+
+    ClassElement lookupTarget = getSuperOrThisLookupTarget(constructor,
+                                                           isSuperCall,
+                                                           call);
+    final SourceString className = lookupTarget.name;
+
+    SourceString constructorName;
+    Selector lookupSelector;
+    if (resolver.isNamedConstructor(call)) {
+      constructorName = resolver.getConstructorName(call);
+      lookupSelector = new Selector.callConstructor(
+          className,
+          constructorName,
+          visitor.enclosingElement.getLibrary());
+    } else {
+      constructorName = const SourceString('');
+      lookupSelector = new Selector.callDefaultConstructor(
+          className,
+          visitor.enclosingElement.getLibrary());
+    }
+
+    FunctionElement lookedupConstructor =
+        lookupTarget.lookupConstructor(lookupSelector);
+
+    final bool isImplicitSuperCall = false;
+    verifyThatConstructorMatchesCall(lookedupConstructor,
+                                     selector,
+                                     isImplicitSuperCall,
+                                     call,
+                                     constructorName,
+                                     className);
+
+    visitor.useElement(call, lookedupConstructor);
+    visitor.world.registerStaticUse(lookedupConstructor);
+    return lookedupConstructor;
   }
 
   void resolveImplicitSuperConstructorSend(FunctionElement constructor,
@@ -580,55 +637,58 @@ class InitializerResolver {
     if (classElement != visitor.compiler.objectClass) {
       assert(superClass !== null);
       assert(superClass.resolutionState == STATE_DONE);
-      SourceString name = const SourceString('');
-      Selector call = new Selector.call(name, classElement.getLibrary(), 0);
-      var element = resolveSuperOrThis(constructor, true, true,
-                                       name, call, functionNode);
-      visitor.world.registerStaticUse(element);
-    }
-  }
-
-  Element resolveSuperOrThis(FunctionElement constructor,
-                             bool isSuperCall,
-                             bool isImplicitSuperCall,
-                             SourceString constructorName,
-                             Selector selector,
-                             Node diagnosticNode) {
-    ClassElement lookupTarget = constructor.getEnclosingClass();
-    bool validTarget = true;
-    FunctionElement result;
-    if (isSuperCall) {
-      // Calculate correct lookup target and constructor name.
-      if (lookupTarget === visitor.compiler.objectClass) {
-        error(diagnosticNode, MessageKind.SUPER_INITIALIZER_IN_OBJECT);
-      } else {
-        lookupTarget = lookupTarget.supertype.element;
-      }
-    }
-
-    // Lookup constructor and try to match it to the selector.
-    ResolverTask resolver = visitor.compiler.resolver;
-    final SourceString className = lookupTarget.name;
-    result = lookupTarget.lookupConstructor(className, constructorName);
-    if (result === null || !result.isGenerativeConstructor()) {
-      String classNameString = className.slowToString();
-      String constructorNameString = constructorName.slowToString();
-      String name = (constructorName === const SourceString(''))
-                        ? classNameString
-                        : "$classNameString.$constructorNameString";
+      SourceString constructorName = const SourceString('');
+      Selector callToMatch = new Selector.call(
+          constructorName,
+          classElement.getLibrary(),
+          0);
+
+      final bool isSuperCall = true;
+      ClassElement lookupTarget = getSuperOrThisLookupTarget(constructor,
+                                                             isSuperCall,
+                                                             functionNode);
+      final SourceString className = lookupTarget.name;
+      Element calledConstructor = lookupTarget.lookupConstructor(
+          new Selector.callDefaultConstructor(
+              className,
+              visitor.enclosingElement.getLibrary()));
+
+      final bool isImplicitSuperCall = true;
+      verifyThatConstructorMatchesCall(calledConstructor,
+                                       callToMatch,
+                                       isImplicitSuperCall,
+                                       functionNode,
+                                       className,
+                                       const SourceString(''));
+
+      visitor.world.registerStaticUse(calledConstructor);
+    }
+  }
+
+  void verifyThatConstructorMatchesCall(
+      FunctionElement lookedupConstructor,
+      Selector call,
+      bool isImplicitSuperCall,
+      Node diagnosticNode,
+      SourceString className,
+      SourceString constructorName) {
+    if (lookedupConstructor === null
+        || !lookedupConstructor.isGenerativeConstructor()) {
+      var fullConstructorName =
+          visitor.compiler.resolver.createConstructorFullName(className,
+                                                              constructorName);
       MessageKind kind = isImplicitSuperCall
                          ? MessageKind.CANNOT_RESOLVE_CONSTRUCTOR_FOR_IMPLICIT
                          : MessageKind.CANNOT_RESOLVE_CONSTRUCTOR;
-      error(diagnosticNode, kind, [name]);
+      error(diagnosticNode, kind, [fullConstructorName]);
     } else {
-      if (!selector.applies(result, visitor.compiler)) {
+      if (!call.applies(lookedupConstructor, visitor.compiler)) {
         MessageKind kind = isImplicitSuperCall
                            ? MessageKind.NO_MATCHING_CONSTRUCTOR_FOR_IMPLICIT
                            : MessageKind.NO_MATCHING_CONSTRUCTOR;
         error(diagnosticNode, kind);
       }
     }
-    return result;
   }
 
   FunctionElement resolveRedirection(FunctionElement constructor,
@@ -2647,17 +2707,26 @@ class ConstructorResolver extends CommonResolverVisitor<Element> {
                                     Node diagnosticNode,
                                     SourceString constructorName) {
     cls.ensureResolved(compiler);
-    Element result = cls.lookupConstructor(cls.name, constructorName);
+    Selector selector =
+        constructorName === const SourceString('')
+        ? new Selector.callDefaultConstructor(
+            cls.name,
+            resolver.enclosingElement.getLibrary())
+        : new Selector.callConstructor(cls.name,
+                                       constructorName,
+                                       resolver.enclosingElement.getLibrary());
+    Element result = cls.lookupConstructor(selector);
     if (result === null) {
-      String fullConstructorName = cls.name.slowToString();
-      if (constructorName !== const SourceString('')) {
-        fullConstructorName = '$fullConstructorName'
-                              '.${constructorName.slowToString()}';
-      }
-      return failOrReturnErroneousElement(cls, diagnosticNode,
-                                          new SourceString(fullConstructorName),
-                                          MessageKind.CANNOT_FIND_CONSTRUCTOR,
-                                          [fullConstructorName]);
+      String fullConstructorName =
+          resolver.compiler.resolver.createConstructorFullName(
+              cls.name,
+              constructorName);
+      return failOrReturnErroneousElement(
+          cls,
+          diagnosticNode,
+          new SourceString(fullConstructorName),
+          MessageKind.CANNOT_FIND_CONSTRUCTOR,
+          [fullConstructorName]);
     } else if (inConstContext &&
                (result.modifiers == null || !result.modifiers.isConst())) {
       error(diagnosticNode, MessageKind.CONSTRUCTOR_IS_NOT_CONST);