Decouple SSA builder from codegen-work-item

pkg/compiler/lib/src/dump_info.dart

 // Copyright (c) 2013, 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 dump_info;
 
 import 'dart:convert'
     show HtmlEscape, JsonEncoder, StringConversionSink, ChunkedConversionSink;
 
 import 'package:dart2js_info/info.dart';
@@ skipping 327 matching lines @@
     });
   }
 }
 
 class Selection {
   final Element selectedElement;
   final TypeMask mask;
   Selection(this.selectedElement, this.mask);
 }
 
-class DumpInfoTask extends CompilerTask {
+/// Interface used to record information from different parts of the compiler so
+/// we can emit them in the dump-info task.
+// TODO(sigmund,het): move more features here. Ideallly the dump-info task
+// shouldn't reach into internals of other parts of the compiler. For example,
+// we currently reach into the full emitter and as a result we don't support
+// dump-info when using the startup-emitter (issue #24190).
+abstract class InfoReporter {
+  void reportInlined(Element element, Element inlinedFrom);
+}
+
+class DumpInfoTask extends CompilerTask implements InfoReporter {
   DumpInfoTask(Compiler compiler) : super(compiler);
 
   String get name => "Dump Info";
 
   ElementInfoCollector infoCollector;
 
   /// The size of the generated output.
   int _programSize;
 
   // A set of javascript AST nodes that we care about the size of.
@@ skipping 13 matching lines @@
   final Map<Element, int> inlineCount = <Element, int>{};
   // A mapping from an element to a list of elements that are
   // inlined inside of it.
   final Map<Element, List<Element>> inlineMap = <Element, List<Element>>{};
 
   /// Register the size of the generated output.
   void reportSize(int programSize) {
     _programSize = programSize;
   }
 
-  void registerInlined(Element element, Element inlinedFrom) {
+  void reportInlined(Element element, Element inlinedFrom) {
     inlineCount.putIfAbsent(element, () => 0);
     inlineCount[element] += 1;
     inlineMap.putIfAbsent(inlinedFrom, () => new List<Element>());
     inlineMap[inlinedFrom].add(element);
   }
 
   /**
    * Registers that a function uses a selector in the
    * function body
    */
@@ skipping 163 matching lines @@
 
     ChunkedConversionSink<Object> sink = encoder.startChunkedConversion(
         new StringConversionSink.fromStringSink(buffer));
     sink.add(result.toJson());
     reporter.reportInfo(NO_LOCATION_SPANNABLE, MessageKind.GENERIC, {
       'text': "View the dumped .info.json file at "
           "https://dart-lang.github.io/dump-info-visualizer"
     });
   }
 }