Shrink AOT snapshot size and memory usage.

runtime/observatory/lib/src/elements/script_inset.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 script_inset_element;
 
 import 'dart:async';
 import 'dart:html';
 import 'dart:svg';
 import 'package:observatory/app.dart';
@@ skipping 54 matching lines @@
     e._startPos = startPos;
     e._endPos = endPos;
     e._currentPos = currentPos;
     e._inDebuggerContext = inDebuggerContext;
     e._variables = new List.unmodifiable(variables);
     return e;
   }
 
   ScriptInsetElement.created() : super.created();
 
+  bool get noSource => _startPos == -1;
+
   @override
   void attached() {
     super.attached();
     _r.enable();
     _subscription = _events.onDebugEvent
       .where((e) => (e is M.BreakpointAddedEvent) ||
                     (e is M.BreakpointResolvedEvent) ||
                     (e is M.BreakpointRemovedEvent))
       .map((e) => e.breakpoint)
       .listen((M.Breakpoint b) {
@@ skipping 17 matching lines @@
 
   @override
   void detached() {
     super.detached();
     children = [];
     _r.disable(notify: true);
     _subscription.cancel();
   }
 
   void render() {
-    if (_loadedScript == null) {
+    if (noSource) {
+      children = [new SpanElement()..text = 'No source'];
+    } else if (_loadedScript == null) {
       children = [new SpanElement()..text = 'Loading...'];
     } else {
       final table = linesTable();
       var firstBuild = false;
       if (container == null) {
         // Indirect to avoid deleting the style element.
         container = new DivElement();
 
         firstBuild = true;
       }
@@ skipping 74 matching lines @@
   Element hitsNotCompiled(Element element) {
     element.classes.add('hitsNotCompiled');
     element.title = "Line in uncompiled function";
     return element;
   }
 
   Element container;
 
   // Build _rangeMap and _callSites from a source report.
   Future _refreshSourceReport() async {
+    if (noSource) return;
+
     var reports = [S.Isolate.kCallSitesReport,
                    S.Isolate.kPossibleBreakpointsReport];
     if (_includeProfile) {
       reports.add(S.Isolate.kProfileReport);
     }
     S.Isolate isolate = _isolate as S.Isolate;
     var sourceReport = await isolate.getSourceReport(
         reports,
         script, _startPos, _endPos);
     _possibleBreakpointLines = S.getPossibleBreakpointLines(sourceReport,
@@ skipping 1154 matching lines @@
     ..children = [
       new PathElement()
         ..setAttribute('d', 'M13.5.67s.74 2.65.74 4.8c0 2.06-1.35 3.73-3.41 '
                             '3.73-2.07 0-3.63-1.67-3.63-3.73l.03-.36C5.21 7.51 '
                             '4 10.62 4 14c0 4.42 3.58 8 8 8s8-3.58 8-8C20 8.61 '
                             '17.41 3.8 13.5.67zM11.71 19c-1.78 '
                             '0-3.22-1.4-3.22-3.14 0-1.62 1.05-2.76 2.81-3.12 '
                             '1.77-.36 3.6-1.21 4.62-2.58.39 1.29.59 2.65.59 '
                             '4.04 0 2.65-2.15 4.8-4.8 4.8z')
     ];