JS templates

sdk/lib/_internal/compiler/implementation/native_handler.dart

 // Copyright (c) 2012, 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.
 
 library native;
 
 import 'dart:collection' show Queue;
 import 'dart2jslib.dart';
 import 'dart_types.dart';
 import 'elements/elements.dart';
@@ skipping 749 matching lines @@
  * `null` may be returned.
  */
 class NativeBehavior {
 
   /// [DartType]s or [SpecialType]s returned or yielded by the native element.
   final List typesReturned = [];
 
   /// [DartType]s or [SpecialType]s instantiated by the native element.
   final List typesInstantiated = [];
 
-  // If this behavior is for a JS expression, [codeAst] contains the
+  // If this behavior is for a JS expression, [codeTemplate] contains the
   // parsed tree.
-  js.Expression codeAst;
+  js.Template codeTemplate;
 
   final SideEffects sideEffects = new SideEffects.empty();
 
   static NativeBehavior NONE = new NativeBehavior();
 
   static NativeBehavior ofJsCall(Send jsCall, Compiler compiler, resolver) {
     // The first argument of a JS-call is a string encoding various attributes
     // of the code.
     //
     //  'Type1|Type2'.  A union type.
@@ skipping 10 matching lines @@
     }
 
     LiteralString specLiteral = argNodes.head.asLiteralString();
     if (specLiteral == null) {
       // TODO(sra): We could accept a type identifier? e.g. JS(bool, '1<2').  It
       // is not very satisfactory because it does not work for void, dynamic.
       compiler.internalError(argNodes.head, "Unexpected JS first argument.");
     }
 
     var behavior = new NativeBehavior();
-    behavior.codeAst = js.js.parseForeignJS(code.dartString.slowToString());
-    new SideEffectsVisitor(behavior.sideEffects).visit(behavior.codeAst);
+    behavior.codeTemplate = js.js.parseForeignJS(code.dartString.slowToString());
+    new SideEffectsVisitor(behavior.sideEffects).visit(behavior.codeTemplate.ast);
 
     String specString = specLiteral.dartString.slowToString();
     // Various things that are not in fact types.
     if (specString == 'void') return behavior;
     if (specString == '' || specString == 'var') {
       behavior.typesReturned.add(compiler.objectClass.computeType(compiler));
       behavior.typesReturned.add(compiler.nullClass.computeType(compiler));
       return behavior;
     }
     for (final typeString in specString.split('|')) {
@@ skipping 340 matching lines @@
       nativeMethodCall = '$receiver$nativeMethodName($foreignParameters)';
     } else if (element.kind == ElementKind.GETTER) {
       nativeMethodCall = '$receiver$nativeMethodName';
     } else if (element.kind == ElementKind.SETTER) {
       nativeMethodCall = '$receiver$nativeMethodName = $foreignParameters';
     } else {
       builder.compiler.internalError(element,
                                      'Unexpected kind: "${element.kind}".');
     }
 
-    builder.push(new HForeign(js.js(nativeMethodCall), backend.dynamicType,
-                              inputs, effects: new SideEffects()));
+    builder.push(
+        new HForeign(
+            // TODO(sra): This could be cached.  The number of templates should
+            // be proportional to the number of native methods, which is bounded
+            // by the dart: libraries.
+            js.js.uncachedExpressionTemplate(nativeMethodCall),
+            backend.dynamicType,
+            inputs, effects: new SideEffects()));
     builder.close(new HReturn(builder.pop())).addSuccessor(builder.graph.exit);
   } else {
     if (parameters.parameterCount != 0) {
       compiler.internalError(nativeBody,
           'native "..." syntax is restricted to '
           'functions with zero parameters.');
     }
     LiteralString jsCode = nativeBody.asLiteralString();
     builder.push(new HForeign.statement(
-        new js.LiteralStatement(jsCode.dartString.slowToString()),
+        js.js.expressionTemplateYielding(
+            new js.LiteralStatement(jsCode.dartString.slowToString())),
         <HInstruction>[],
         new SideEffects(),
         null,
         backend.dynamicType));
   }
 }