Added page to Observatory to display native memory allocation information.

runtime/observatory/tests/service/get_native_allocation_samples_test.dart

+// Copyright (c) 2017, 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.
+// VMOptions=--error_on_bad_type --error_on_bad_override
+
+import 'dart:developer';
+import 'package:observatory/models.dart' as M;
+import 'package:observatory/service_io.dart';
+import 'package:observatory/cpu_profile.dart';
+import 'package:unittest/unittest.dart';
+import 'service_test_common.dart';
+import 'test_helper.dart';
+
+void verifyHelper(var root, bool exclusive) {
+  if (root.children.length == 0) {
+    return;
+  }
+
+  int inclusiveAllocations = 0;
+  int exclusiveAllocations = 0;
+
+  for (int i = 0; i < root.children.length; i++) {
+    inclusiveAllocations +=
+      root.children[i].inclusiveNativeAllocations;
+    exclusiveAllocations +=
+      root.children[i].exclusiveNativeAllocations;
+  }
+
+  int rootMemory;
+  if (exclusive) {
+    rootMemory = root.inclusiveNativeAllocations + exclusiveAllocations;
+  } else {
+    rootMemory = root.inclusiveNativeAllocations - root.exclusiveNativeAllocations;
+  }
+
+  expect(inclusiveAllocations == rootMemory, isTrue);
+  for (int i = 0; i < root.children.length; i++) {
+    verifyHelper(root.children[i], exclusive);
+  }
+}
+
+void verify(var tree, bool exclusive) {
+  var node = tree.root;
+  expect(node, isNotNull);
+  expect(node.children.length >= 0, isTrue);
+  for (int i = 0; i < node.children.length; i++) {
+    verifyHelper(node.children[i], exclusive);
+  }
+}
+
+var tests = [
+  // Verify inclusive tries.
+  (VM vm) async {
+    var response = await vm.invokeRpc('_getNativeAllocationSamples', {'tags':
+      'None'});
+    CpuProfile cpuProfile = new CpuProfile();
+    await cpuProfile.load(vm, response);
+    var codeTree = cpuProfile.loadCodeTree(M.ProfileTreeDirection.inclusive);
+    var functionTree =
+      cpuProfile.loadFunctionTree(M.ProfileTreeDirection.inclusive);
+    verify(codeTree, false);
+    verify(functionTree, false);
+  },
+  // Verify exclusive tries.
+  (VM vm) async {
+    var response = await vm.invokeRpc('_getNativeAllocationSamples', {'tags':
+      'None'});
+    CpuProfile cpuProfile = new CpuProfile();
+    await cpuProfile.load(vm, response);
+    var codeTreeExclusive =
+      cpuProfile.loadCodeTree(M.ProfileTreeDirection.exclusive);
+    var functionTreeExclusive=
+      cpuProfile.loadFunctionTree(M.ProfileTreeDirection.exclusive);
+    verify(codeTreeExclusive, true);
+    verify(functionTreeExclusive, true);
+  }
+];
+
+main(args) async => runVMTests(args, tests);