Handle named and optional arguments in cps-ir.

pkg/compiler/lib/src/universe/universe.dart

Index: pkg/compiler/lib/src/universe/universe.dart
diff --git a/pkg/compiler/lib/src/universe/universe.dart b/pkg/compiler/lib/src/universe/universe.dart
index 269f261a789f2a3cf4884547301b96ec2004b416..b71d020be5c2b166d4f7b235845d9562b8b6e3dd 100644
--- a/pkg/compiler/lib/src/universe/universe.dart
+++ b/pkg/compiler/lib/src/universe/universe.dart
@@ -495,7 +495,7 @@ class Selector {
   }
 
   /**
-   * Fills [list] with the arguments in the normalized order.
+   * Returns a `List` with the evaluated arguments in the normalized order.
    *
    * [compileArgument] is a function that returns a compiled version
    * of an argument located in [arguments].
@@ -503,34 +503,78 @@ class Selector {
    * [compileDefaultValue] is a function that returns a compiled constant
    * of an optional argument that is not in [arguments].
    *
-   * Returns [:true:] if the selector and the [element] match; [:false:]
-   * otherwise.
+   * Precondition: `this.applies(element, world)`.
    *
    * Invariant: [element] must be the implementation element.
    */
-  /*<T>*/ bool addArgumentsToList(
+  /*<S, T>*/ List/*<T>*/ makeArgumentsList(
+        List/*<S>*/ arguments,
+        FunctionElement element,
+        /*T*/ compileArgument(/*S*/ argument),
+        /*T*/ compileDefaultValue(ParameterElement element)) {
+    assert(invariant(element, element.isImplementation));
+    List/*<T>*/ result = new List();
+    FunctionSignature parameters = element.functionSignature;
+    int i = 0;
+    parameters.forEachRequiredParameter((ParameterElement element) {
+      result.add(compileArgument(arguments[i]));
+      ++i;
+    });
+
+    if (!parameters.optionalParametersAreNamed) {
+      parameters.forEachOptionalParameter((ParameterElement element) {
+        if (i < arguments.length) {
+          result.add(compileArgument(arguments[i]));
+          ++i;
+        } else {
+          result.add(compileDefaultValue(element));
+        }
+      });
+    } else {
+      // Visit named arguments and add them into a temporary list.
+      List compiledNamedArguments = [];
+      for (; i < arguments.length; ++i) {
+        compiledNamedArguments.add(compileArgument(arguments[i]));
+      }
+      // Iterate over the optional parameters of the signature, and try to
+      // find them in [compiledNamedArguments]. If found, we use the
+      // value in the temporary list, otherwise the default value.
+      parameters.orderedOptionalParameters
+          .forEach((ParameterElement element) {
+        int foundIndex = namedArguments.indexOf(element.name);
+        if (foundIndex != -1) {
+          result.add(compiledNamedArguments[foundIndex]);
+        } else {
+          result.add(compileDefaultValue(element));
+        }
+      });
+    }
+    return result;
+  }
+
+  /// This is a version of [makeArgumentsList] that works for a `Link`
+  /// representation of arguments.
+  /*<T>*/ List/*<T>*/ makeArgumentsList2(
       Link<Node> arguments,
-      List/*<T>*/ list,
       FunctionElement element,
       /*T*/ compileArgument(Node argument),
-      /*T*/ compileDefaultValue(ParameterElement element),
-      World world) {
+      /*T*/ compileDefaultValue(ParameterElement element)) {
     assert(invariant(element, element.isImplementation));
-    if (!this.applies(element, world)) return false;
+    List/*<T>*/ result = new List();
 
     FunctionSignature parameters = element.functionSignature;
     parameters.forEachRequiredParameter((ParameterElement element) {
-      list.add(compileArgument(arguments.head));
+      result.add(compileArgument(arguments.head));
       arguments = arguments.tail;
     });
 
     if (!parameters.optionalParametersAreNamed) {
       parameters.forEachOptionalParameter((ParameterElement element) {
         if (!arguments.isEmpty) {
-          list.add(compileArgument(arguments.head));
+          result.add(compileArgument(arguments.head));
           arguments = arguments.tail;
         } else {
-          list.add(compileDefaultValue(element));
+          result.add(compileDefaultValue(element));
         }
       });
     } else {
@@ -546,15 +590,16 @@ class Selector {
       parameters.orderedOptionalParameters.forEach((ParameterElement element) {
         int foundIndex = namedArguments.indexOf(element.name);
         if (foundIndex != -1) {
-          list.add(compiledNamedArguments[foundIndex]);
+          result.add(compiledNamedArguments[foundIndex]);
         } else {
-          list.add(compileDefaultValue(element));
+          result.add(compileDefaultValue(element));
         }
       });
     }
-    return true;
+    return result;
   }
 
+
   /**
    * Fills [list] with the arguments in the order expected by
    * [callee], and where [caller] is a synthesized element
@@ -621,12 +666,13 @@ class Selector {
                                           signature.parameterCount,
                                           namedParameters);
 
-    return selector.addArgumentsToList(nodes,
-                                       list,
-                                       callee,
-                                       internalCompileArgument,
-                                       compileConstant,
-                                       world);
+    if (!selector.applies(callee, world)) return false;
+    list.addAll(selector.makeArgumentsList2(nodes,
+                                            callee,
+                                            internalCompileArgument,
+                                            compileConstant));
+
+    return true;
   }
 
   static bool sameNames(List<String> first, List<String> second) {