cps-ir: Support foreign code.

pkg/compiler/lib/src/cps_ir/cps_ir_nodes_sexpr.dart

Index: pkg/compiler/lib/src/cps_ir/cps_ir_nodes_sexpr.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes_sexpr.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes_sexpr.dart
index d7f4b4514a05fd36134f995bb45d96d04617f8b6..2a07a9badcf07b107a8d8c37909f024e68ee17d3 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes_sexpr.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes_sexpr.dart
@@ -338,6 +338,13 @@ class SExpressionStringifier extends Indentation implements Visitor<String> {
     String args = node.arguments.map(access).join(', ');
     return '(CreateInvocationMirror $selector $args)';
   }
+
+  @override
+  String visitForeignCode(ForeignCode node) {
+    String arguments = node.arguments.map(access).join(', ');

[Kevin Millikin (Google), 2015/06/16 11:23:10]

Arguments are just space separated.

[karlklose, 2015/06/18 09:38:14]

Done.

+    String continuation = access(node.continuation);
+    return '(JS ${node.type} ${node.codeTemplate} $arguments $continuation)';

[Kevin Millikin (Google), 2015/06/16 11:23:10]

Arguments are enclosed in parentheses '($arguments)'.  (All variable arity parts
are like that, to make parsing simpler.)

[karlklose, 2015/06/18 09:38:14]

Done.

+  }
 }
 
 class ConstantStringifier extends ConstantValueVisitor<String, Null> {