Add measurements and send-metrics to dart2js's info.

bin/inference/print_summary.dart

Index: bin/inference/print_summary.dart
diff --git a/bin/inference/print_summary.dart b/bin/inference/print_summary.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f03607c3af65bedb2016c8ae27b74df0c3f63efc
--- /dev/null
+++ b/bin/inference/print_summary.dart
@@ -0,0 +1,96 @@
+// Copyright (c) 2015, 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.
+
+/// Utility to display statistics about "sends" as a table on the command line.
+library compiler.tool.stats.print_summary;
+
+import 'dart:io';
+import 'dart:convert';
+import 'package:dart2js_info/info.dart';
+import 'package:dart2js_info/src/table.dart';
+
+main(args) {
+  var file = args.length > 0 ? args[0] : 'out.js.info.json';
+  var json = JSON.decode(new File(file).readAsStringSync());
+  var results = AllInfo.parseFromJson(json);
+  print(formatAsTable(results));
+}
+
+/// Formats [results] as a table.
+String formatAsTable(AllInfo all) {
+  var visitor = new _Counter();
+  all.accept(visitor);
+  var table = new Table();
+  table.declareColumn('bundle');
+
+  int colorIndex = 0;
+  visitAllMetrics((m, _) {
+    if (m is GroupedMetric) colorIndex = (colorIndex + 1) % _groupColors.length;
+    table.declareColumn(m.name,
+        abbreviate: true, color: _groupColors[colorIndex]);
+  });
+  table.addHeader();
+  appendCount(n) => table.addEntry(n == null ? 0 : n);
+
+  for (var bundle in visitor.bundleTotals.keys) {
+    table.addEntry(bundle);
+    visitAllMetrics(
+        (m, _) => appendCount(visitor.bundleTotals[bundle].counters[m]));
+  }
+  table.addEmptyRow();
+  table.addHeader();
+  table.addEntry('total');
+  visitAllMetrics((m, _) => appendCount(visitor.totals.counters[m]));
+
+  appendPercent(count, total) {
+    if (count == null) count = 0;
+    if (total == null) total = 0;
+    var percent = count * 100 / total;
+    table.addEntry(percent == 100 ? 100 : percent.toStringAsFixed(2));
+  }
+
+  table.addEntry('%');
+  visitAllMetrics((metric, parents) {
+    if (parents == null || parents.isEmpty) {
+      table.addEntry(100);
+    } else {
+      appendPercent(
+          visitor.totals.counters[metric], visitor.totals.counters[parents[0]]);
+    }
+  });
+
+  return table.toString();
+}
+
+/// Visitor that adds up results for all functions in libraries, and all
+/// libraries in a bundle.
+class _Counter extends RecursiveInfoVisitor {
+  Map<String, Measurements> bundleTotals = {};
+  Measurements currentBundleTotals;
+  Measurements totals = new Measurements();
+
+  visitLibrary(LibraryInfo info) {
+    var uri = info.uri;
+    var bundle = uri.scheme == 'package'
+        ? uri.pathSegments.first
+        : uri.scheme == 'file' ? uri.pathSegments.last : '$uri';
+    currentBundleTotals =
+        bundleTotals.putIfAbsent(bundle, () => new Measurements());
+    super.visitLibrary(info);
+    totals.addFrom(currentBundleTotals);
+  }
+
+  visitFunction(FunctionInfo function) {
+    var measurements = function.measurements;
+    if (measurements == null) return;
+    currentBundleTotals.addFrom(measurements);
+  }
+}
+
+const _groupColors = const [_YELLOW_COLOR, _NO_COLOR];
+
+const _NO_COLOR = "\x1b[0m";
+const _GREEN_COLOR = "\x1b[32m";
+const _YELLOW_COLOR = "\x1b[33m";
+const _WHITE_COLOR = "\x1b[37m";