cps-ir: Support foreign code.

pkg/compiler/lib/src/js_backend/codegen/task.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// Generate code using the cps-based IR pipeline.
 library code_generator_task;
 
 import 'glue.dart';
 import 'codegen.dart';
 import 'unsugar.dart';
@@ skipping 39 matching lines @@
                       SourceInformationFactory sourceInformationFactory)
       : fallbackCompiler =
             new ssa.SsaFunctionCompiler(backend, sourceInformationFactory),
         this.sourceInformationFactory = sourceInformationFactory,
         constantSystem = backend.constantSystem,
         compiler = compiler,
         glue = new Glue(compiler);
 
   String get name => 'CPS Ir pipeline';
 
-  /// Generates JavaScript code for `work.element`. First tries to use the
-  /// Cps Ir -> tree ir -> js pipeline, and if that fails due to language
-  /// features not implemented it will fall back to the ssa pipeline (for
-  /// platform code) or will cancel compilation (for user code).
+  /// Generates JavaScript code for `work.element`.
   js.Fun compile(CodegenWorkItem work) {
     AstElement element = work.element;
     JavaScriptBackend backend = compiler.backend;
     return compiler.withCurrentElement(element, () {
-      if (element.library.isPlatformLibrary ||
-          element.library == backend.interceptorsLibrary) {
-        compiler.log('Using SSA compiler for platform element $element');
-        return fallbackCompiler.compile(work);
-      }
       try {
+        ClassElement cls = element.enclosingClass;
+        String name = element.name;
+        String className = cls == null ? null : cls.name;
+        LibraryElement library = element.library;
+        String libraryName = library == null ? null : library.toString();
+        // TODO(karlklose): remove this fallback.
+        // Fallback for a few functions that we know require try-finally and
+        // switch.
+        if (element.isNative ||
+            element.isPatched ||
+            libraryName == 'origin library(dart:typed_data)' ||
+            // Using switch or try-finally.
+            library.isInternalLibrary && name == 'unwrapException' ||
+            library.isPlatformLibrary && className == 'IterableBase' ||
+            library.isInternalLibrary && className == 'Closure' ||
+            libraryName == 'origin library(dart:collection)' &&
+               name == 'mapToString' ||
+            libraryName == 'library(dart:html)' && name == 'sanitizeNode' ||
+            className == '_IsolateContext' ||
+            className == 'IsolateNatives' ||
+            className == '_Deserializer' ||
+            name == '_rootRun' ||
+            name == '_microtaskLoopEntry') {
+          compiler.log('Using SSA compiler for platform element $element');
+          return fallbackCompiler.compile(work);
+        }
+
         if (tracer != null) {
           tracer.traceCompilation(element.name, null);
         }
         cps.FunctionDefinition cpsFunction = compileToCpsIR(element);
         cpsFunction = optimizeCpsIR(cpsFunction);
         tree_ir.FunctionDefinition treeFunction = compileToTreeIR(cpsFunction);
         treeFunction = optimizeTreeIR(treeFunction);
         return compileToJavaScript(work, treeFunction);
       } on CodegenBailout catch (e) {
         String message = "Unable to compile $element with the new compiler.\n"
@@ skipping 129 matching lines @@
     // TODO(sigurdm): Make a better list of tasks.
     return <CompilerTask>[irBuilderTask]..addAll(fallbackCompiler.tasks);
   }
 
   js.Node attachPosition(js.Node node, AstElement element) {
     return node.withSourceInformation(
         sourceInformationFactory.forContext(element)
             .buildDeclaration(element));
   }
 }