dart2js cps: Remove dart2dart from cps pipeline and clean up.

pkg/compiler/lib/src/dart_backend/backend.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.
 
 part of dart_backend;
 
 // TODO(ahe): This class is simply wrong.  This backend should use
 // elements when it can, not AST nodes.  Perhaps a [Map<Element,
 // TreeElements>] is what is needed.
 class ElementAst {
@@ skipping 112 matching lines @@
     }
     // Enqueue the methods that the VM might invoke on user objects because
     // we don't trust the resolution to always get these included.
     world.registerInvocation(new Selector.call("toString", null, 0));
     world.registerInvokedGetter(new Selector.getter("hashCode", null));
     world.registerInvocation(new Selector.binaryOperator("=="));
     world.registerInvocation(new Selector.call("compareTo", null, 1));
   }
 
   void codegen(CodegenWorkItem work) { }
-
-  static bool checkTreeIntegrity(tree_ir.RootNode node) {
-    new CheckTreeIntegrity().check(node);
-    return true; // So this can be used from assert().
-  }
-
-  static bool checkCpsIntegrity(cps_ir.RootNode node) {
-    new CheckCpsIntegrity().check(node);
-    return true; // So this can be used from assert().
-  }
-
-  /// Create an [ElementAst] from the CPS IR.
-  static ElementAst createElementAst(
-       ElementAstCreationContext context,
-       Element element,
-       cps_ir.RootNode cpsRoot) {
-    context.traceCompilation(element.name);
-    context.traceGraph('CPS builder', cpsRoot);
-    assert(checkCpsIntegrity(cpsRoot));
-
-    // Transformations on the CPS IR.
-    void applyCpsPass(cps_opt.Pass pass) {
-      pass.rewrite(cpsRoot);
-      context.traceGraph(pass.passName, cpsRoot);
-      assert(checkCpsIntegrity(cpsRoot));
-    }
-
-    // TODO(karlklose): enable type propagation for dart2dart when constant
-    // types are correctly marked as instantiated (Issue 21880).
-    TypePropagator typePropagator = new TypePropagator(
-        context.dartTypes,
-        context.constantSystem,
-        new UnitTypeSystem(),
-        context.internalError);
-    applyCpsPass(typePropagator);
-    applyCpsPass(new RedundantPhiEliminator());
-    applyCpsPass(new ShrinkingReducer());
-
-    tree_builder.Builder builder =
-        new tree_builder.Builder(context.internalError);
-    tree_ir.RootNode treeRoot = builder.build(cpsRoot);
-    assert(treeRoot != null);
-    context.traceGraph('Tree builder', treeRoot);
-    assert(checkTreeIntegrity(treeRoot));
-
-    // Transformations on the Tree IR.
-    void applyTreePass(tree_opt.Pass pass) {
-      pass.rewrite(treeRoot);
-      context.traceGraph(pass.passName, treeRoot);
-      assert(checkTreeIntegrity(treeRoot));
-    }
-
-    applyTreePass(new StatementRewriter(isDartMode: true));
-    applyTreePass(new VariableMerger());
-    applyTreePass(new LoopRewriter());
-    applyTreePass(new LogicalRewriter());
-    applyTreePass(new PullIntoInitializers());
-
-    // Backend-specific transformations.
-    new backend_ast_emitter.UnshadowParameters().unshadow(treeRoot);
-    context.traceGraph('Unshadow parameters', treeRoot);
-
-    TreeElementMapping treeElements = new TreeElementMapping(element);
-    backend_ast.RootNode backendAst = backend_ast_emitter.emit(treeRoot);
-    Node frontend_ast = backend2frontend.emit(treeElements, backendAst);
-    return new ElementAst(frontend_ast, treeElements);
-
-  }
-
   /**
    * Tells whether we should output given element. Corelib classes like
    * Object should not be in the resulting code.
    */
   @override
   bool shouldOutput(Element element) {
     return (!element.library.isPlatformLibrary &&
             !element.isSynthesized &&
             element is! AbstractFieldElement)
         || mirrorRenamer.isMirrorHelperLibrary(element.library);
   }
 
   int assembleProgram() {
     ElementAstCreationContext context =
         new _ElementAstCreationContext(compiler, constantSystem);
 
     ElementAst computeElementAst(AstElement element) {
-      if (!compiler.irBuilder.hasIr(element)) {
-        return new ElementAst(element.resolvedAst.node,
-                              element.resolvedAst.elements);
-      } else {
-        cps_ir.RootNode irNode = compiler.irBuilder.getIr(element);
-        return createElementAst(context, element, irNode);
-      }
+      return new ElementAst(element.resolvedAst.node,
+                            element.resolvedAst.elements);
     }
 
     // TODO(johnniwinther): Remove the need for this method.
     void postProcessElementAst(
         AstElement element, ElementAst elementAst,
         newTypedefElementCallback,
         newClassElementCallback) {
       ReferencedElementCollector collector =
           new ReferencedElementCollector(compiler,
                                          element,
@@ skipping 322 matching lines @@
   }
 
   void traceGraph(String title, var irObject) {
     compiler.tracer.traceGraph(title, irObject);
   }
 
   DartTypes get dartTypes => compiler.types;
 
   InternalErrorFunction get internalError => compiler.internalError;
 }