Add getCallSiteData to the VM service.

runtime/observatory/test/call_site_data_test.dart

Index: runtime/observatory/test/call_site_data_test.dart
diff --git a/runtime/observatory/test/call_site_data_test.dart b/runtime/observatory/test/call_site_data_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..2bd23f7d09514de977f5f21024481f428385fc0d
--- /dev/null
+++ b/runtime/observatory/test/call_site_data_test.dart
@@ -0,0 +1,118 @@
+// 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.
+
+library call_site_data_test;
+
+import 'package:observatory/service_io.dart';
+import 'package:unittest/unittest.dart';
+import 'test_helper.dart';
+import 'dart:async';
+
+class A { foo() => 'A'; }
+class B { foo() => 'B'; }
+class C { foo() => 'C'; }
+class D { foo() => 'D'; }
+class E { foo() => 'E'; }
+class F { foo() => 'F'; }
+class G { foo() => 'G'; }
+class H { foo() => 'H'; }
+
+monomorphic(fooable) {
+  fooable.foo();
+  return null;
+}
+polymorphic(fooable) {
+  fooable.foo();
+  return null;
+}
+megamorphic(fooable) {
+  fooable.foo();
+  return null;
+}
+
+script() {
+  for (int i = 0; i < 10; i++) monomorphic(new A());
+
+  for (int i = 0; i < 10; i++) polymorphic(new A());
+  for (int i = 0; i < 20; i++) polymorphic(new B());
+  for (int i = 0; i < 30; i++) polymorphic(new C());
+
+  for (int i = 0; i < 10; i++) megamorphic(new A());
+  for (int i = 0; i < 20; i++) megamorphic(new B());
+  for (int i = 0; i < 30; i++) megamorphic(new C());
+  for (int i = 0; i < 40; i++) megamorphic(new D());
+  for (int i = 0; i < 50; i++) megamorphic(new E());
+  for (int i = 0; i < 60; i++) megamorphic(new F());
+  for (int i = 0; i < 70; i++) megamorphic(new G());
+  for (int i = 0; i < 80; i++) megamorphic(new H());
+}
+
+
+Set<String> stringifyCacheEntries(Map callSite) {
+  return callSite['cacheEntries'].map((entry) {
+    return "${entry['receiverClass']['name']}:${entry['count']}";
+  }).toSet();
+}
+
+var tests = [
+(Isolate isolate) {
+  return isolate.rootLib.load().then((Library lib) {
+    var monomorphic = lib.functions.singleWhere((f) => f.name == 'monomorphic');
+    var polymorphic = lib.functions.singleWhere((f) => f.name == 'polymorphic');
+    var megamorphic = lib.functions.singleWhere((f) => f.name == 'megamorphic');
+
+    List tests = [];
+    tests.add(isolate.invokeRpcNoUpgrade('getCallSiteData',
+                                         { 'targetId': monomorphic.id })
+                .then((Map response) {
+                    print("Monomorphic: $response");
+                    expect(response['type'], equals('_CallSiteData'));
+                    expect(response['function']['id'], equals(monomorphic.id));
+                    expect(response['callSites'], isList);
+                    expect(response['callSites'], hasLength(1));
+                    Map callSite = response['callSites'].single;
+                    expect(callSite['name'], equals('foo'));
+                    // expect(callSite['deoptReasons'], equals(''));
+                    expect(stringifyCacheEntries(callSite),
+                           equals(['A:10'].toSet()));
+                }));
+
+    tests.add(isolate.invokeRpcNoUpgrade('getCallSiteData',
+                                         { 'targetId': polymorphic.id })
+                .then((Map response) {
+                    print("Polymorphic: $response");
+                    expect(response['type'], equals('_CallSiteData'));
+                    expect(response['function']['id'], equals(polymorphic.id));
+                    expect(response['callSites'], isList);
+                    expect(response['callSites'], hasLength(1));
+                    Map callSite = response['callSites'].single;
+                    expect(callSite['name'], equals('foo'));
+                    // expect(callSite['deoptReasons'], equals(''));
+                    expect(stringifyCacheEntries(callSite),
+                           equals(['A:10', 'B:20', 'C:30'].toSet()));
+                }));
+
+    tests.add(isolate.invokeRpcNoUpgrade('getCallSiteData',
+                                         { 'targetId': megamorphic.id })
+                .then((Map response) {
+                    print("Megamorphic: $response");
+                    expect(response['type'], equals('_CallSiteData'));
+                    expect(response['function']['id'], equals(megamorphic.id));
+                    expect(response['callSites'], isList);
+                    expect(response['callSites'], hasLength(1));
+                    Map callSite = response['callSites'].single;
+                    expect(callSite['name'], equals('foo'));
+                    // expect(callSite['deoptReasons'], equals(''));
+                    expect(stringifyCacheEntries(callSite),
+                           equals(['A:10', 'B:20', 'C:30', 'D:40',
+                                   'E:50', 'F:60', 'G:70', 'H:80'].toSet()));
+                }));
+
+    return Future.wait(tests);
+  });
+},
+
+];
+
+main(args) => runIsolateTests(args, tests, testeeBefore: script);