Implement JS_INTERCEPTOR_CONSTANT

sdk/lib/_internal/compiler/implementation/ssa/builder.dart

Index: sdk/lib/_internal/compiler/implementation/ssa/builder.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ssa/builder.dart b/sdk/lib/_internal/compiler/implementation/ssa/builder.dart
index d025633cea73351b7ae16e336e238b1efe9fdd9d..5a26177def4e3b11efe350769586c4d9fdf290af 100644
--- a/sdk/lib/_internal/compiler/implementation/ssa/builder.dart
+++ b/sdk/lib/_internal/compiler/implementation/ssa/builder.dart
@@ -3201,6 +3201,33 @@ class SsaBuilder extends ResolvedVisitor implements Visitor {
                 argument, string.dartString.slowToString())));
   }
 
+  void handleJsInterceptorConstant(Send node) {
+    void bad(Node node) {
+      compiler.reportError(node,
+          MessageKind.WRONG_ARGUMENT_FOR_JS_INTERCEPTOR_CONSTANT);
+      stack.add(graph.addConstantNull(compiler));
+    }
+    if (node.arguments.isEmpty || !node.arguments.tail.isEmpty) {
+      return bad(node.arguments);
+    }
+    Node argument = node.arguments.head;
+    // argument must be a TypeConstant.
+    visit(argument);
+    HInstruction argumentInstruction = pop();
+    if (argumentInstruction is! HConstant) {
+      return bad(argument);
+    }
+    Constant argumentConstant = argumentInstruction.constant;
+    if (argumentConstant is! TypeConstant) {
+      return bad(argument);
+    }
+
+    Constant constant =
+        new InterceptorConstant(argumentConstant.representedType);
+    HInstruction instruction = graph.addConstant(constant, compiler);
+    stack.add(instruction);
+  }
+
   void handleForeignJsCallInIsolate(Send node) {
     Link<Node> link = node.arguments;
     if (!compiler.hasIsolateSupport()) {
@@ -3370,6 +3397,8 @@ class SsaBuilder extends ResolvedVisitor implements Visitor {
       handleForeignJsGetName(node);
     } else if (name == 'JS_EFFECT') {
       stack.add(graph.addConstantNull(compiler));
+    } else if (name == 'JS_INTERCEPTOR_CONSTANT') {
+      handleJsInterceptorConstant(node);
     } else {
       throw "Unknown foreign: ${selector}";
     }