Add a target for the proxy unittests. Write tests for the var tracker....

ppapi/proxy/plugin_var_tracker_unittest.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ipc/ipc_test_sink.h"
+#include "ppapi/proxy/plugin_var_tracker.h"
+#include "ppapi/proxy/ppapi_messages.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace pp {
+namespace proxy {
+
+namespace {
+
+PP_Var MakeObject(PluginVarTracker::VarID object_id) {
+  PP_Var ret;
+  ret.type = PP_VARTYPE_OBJECT;
+  ret.value.as_id = object_id;
+  return ret;
+}
+
+}  // namespace
+
+class PluginVarTrackerTest : public testing::Test {
+ public:
+  PluginVarTrackerTest() {}
+
+ protected:
+  // Asserts that there is a unique "release object" IPC message in the test
+  // sink. This will return the var ID from the message or -1 if none found.
+  PluginVarTracker::VarID GetObjectIDForUniqueReleaseObject() {
+    const IPC::Message* release_msg = sink_.GetUniqueMessageMatching(
+        PpapiHostMsg_PPBVar_ReleaseObject::ID);
+    if (!release_msg)
+      return -1;
+
+    Tuple1<int64> id;
+    PpapiHostMsg_PPBVar_ReleaseObject::Read(release_msg, &id);
+    return id.a;
+  }
+
+  PluginVarTracker tracker_;
+
+  IPC::TestSink sink_;
+};
+
+// Creates a PP_Var from the given string ID.
+PP_Var MakeString(PluginVarTracker::VarID string_id) {

[piman, 2011/01/21 17:11:56]

Move this to anonymous namespace ?

+  PP_Var ret;
+  ret.type = PP_VARTYPE_STRING;
+  ret.value.as_id = string_id;
+  return ret;
+}
+
+TEST_F(PluginVarTrackerTest, Strings) {
+  std::string str("Hello");
+  PluginVarTracker::VarID str_id1 = tracker_.MakeString(str);
+  EXPECT_NE(0, str_id1);
+
+  PluginVarTracker::VarID str_id2 = tracker_.MakeString(
+      str.c_str(), static_cast<uint32_t>(str.size()));
+  EXPECT_NE(0, str_id2);
+
+  // Make sure the strings come out the other end.
+  std::string result = tracker_.GetString(MakeString(str_id1));
+  EXPECT_EQ(str, result);
+  result = tracker_.GetString(MakeString(str_id2));
+  EXPECT_EQ(str, result);
+}
+
+TEST_F(PluginVarTrackerTest, GetHostObject) {
+  PP_Var host_object = MakeObject(12345);
+
+  // Round-trip through the tracker to make sure the host object comes out the
+  // other end.
+  PP_Var plugin_object = tracker_.ReceiveObjectPassRef(host_object, &sink_);
+  PP_Var host_object2 = tracker_.GetHostObject(plugin_object);
+  EXPECT_EQ(PP_VARTYPE_OBJECT, host_object2.type);
+  EXPECT_EQ(host_object.value.as_id, host_object2.value.as_id);
+
+  tracker_.Release(plugin_object);
+}
+
+TEST_F(PluginVarTrackerTest, ReceiveObjectPassRef) {
+  PP_Var host_object = MakeObject(12345);
+
+  // Receive the object, we should have one ref and no messages.
+  PP_Var plugin_object = tracker_.ReceiveObjectPassRef(host_object, &sink_);
+  EXPECT_EQ(0u, sink_.message_count());
+  EXPECT_EQ(1, tracker_.GetRefCountForObject(plugin_object));
+  EXPECT_EQ(0,
+            tracker_.GetTrackedWithNoReferenceCountForObject(plugin_object));
+
+  // Receive the same object again, we should get the same plugin ID out.
+  PP_Var plugin_object2 = tracker_.ReceiveObjectPassRef(host_object, &sink_);
+  EXPECT_EQ(plugin_object.value.as_id, plugin_object2.value.as_id);
+  EXPECT_EQ(2, tracker_.GetRefCountForObject(plugin_object));
+  EXPECT_EQ(0,
+            tracker_.GetTrackedWithNoReferenceCountForObject(plugin_object));
+
+  // It should have sent one message to decerment the refcount in the host.
+  // This is because it only maintains one host refcount for all references
+  // in the plugin, but the host just sent the second one.
+  EXPECT_EQ(host_object.value.as_id, GetObjectIDForUniqueReleaseObject());
+  sink_.ClearMessages();
+
+  // Release the object, one ref at a time. The second release should free
+  // the tracking data and send a release message to the browser.
+  tracker_.Release(plugin_object);
+  EXPECT_EQ(1, tracker_.GetRefCountForObject(plugin_object));
+  tracker_.Release(plugin_object);
+  EXPECT_EQ(-1, tracker_.GetRefCountForObject(plugin_object));
+  EXPECT_EQ(host_object.value.as_id, GetObjectIDForUniqueReleaseObject());
+}
+
+// Tests freeing objects that have both refcounts and "tracked with no ref".
+TEST_F(PluginVarTrackerTest, FreeTrackedAndReferencedObject) {
+  PP_Var host_object = MakeObject(12345);
+
+  // Phase one: First receive via a "pass ref", then a tracked with no ref.
+  PP_Var plugin_var = tracker_.ReceiveObjectPassRef(host_object, &sink_);
+  PP_Var plugin_var2 = tracker_.TrackObjectWithNoReference(host_object, &sink_);
+  EXPECT_EQ(plugin_var.value.as_id, plugin_var2.value.as_id);
+  EXPECT_EQ(1, tracker_.GetRefCountForObject(plugin_var));
+  EXPECT_EQ(1, tracker_.GetTrackedWithNoReferenceCountForObject(plugin_var));
+
+  // Free via the refcount, this should release the object to the browser but
+  // maintain the tracked object.
+  tracker_.Release(plugin_var);
+  EXPECT_EQ(0, tracker_.GetRefCountForObject(plugin_var));
+  EXPECT_EQ(1u, sink_.message_count());
+  EXPECT_EQ(host_object.value.as_id, GetObjectIDForUniqueReleaseObject());
+
+  // Now free via the tracked object, this should free it.
+  tracker_.StopTrackingObjectWithNoReference(plugin_var);
+  EXPECT_EQ(-1, tracker_.GetRefCountForObject(plugin_var));
+
+  // Phase two: Receive via a tracked, then get an addref.
+  sink_.ClearMessages();
+  plugin_var = tracker_.TrackObjectWithNoReference(host_object, &sink_);
+  plugin_var2 = tracker_.ReceiveObjectPassRef(host_object, &sink_);
+  EXPECT_EQ(plugin_var.value.as_id, plugin_var2.value.as_id);
+  EXPECT_EQ(1, tracker_.GetRefCountForObject(plugin_var));
+  EXPECT_EQ(1, tracker_.GetTrackedWithNoReferenceCountForObject(plugin_var));
+
+  // Free via the tracked object, this should have no effect.
+  tracker_.StopTrackingObjectWithNoReference(plugin_var);
+  EXPECT_EQ(0, tracker_.GetTrackedWithNoReferenceCountForObject(plugin_var));
+  EXPECT_EQ(0u, sink_.message_count());
+
+  // Now free via the refcount, this should delete it.
+  tracker_.Release(plugin_var);
+  EXPECT_EQ(-1, tracker_.GetRefCountForObject(plugin_var));
+  EXPECT_EQ(host_object.value.as_id, GetObjectIDForUniqueReleaseObject());
+}
+
+TEST_F(PluginVarTrackerTest, RecursiveTrackWithNoRef) {
+  PP_Var host_object = MakeObject(12345);
+
+  // Receive a tracked object twice.
+  PP_Var plugin_var = tracker_.TrackObjectWithNoReference(host_object, &sink_);
+  EXPECT_EQ(1, tracker_.GetTrackedWithNoReferenceCountForObject(plugin_var));
+  PP_Var plugin_var2 = tracker_.TrackObjectWithNoReference(host_object, &sink_);
+  EXPECT_EQ(plugin_var.value.as_id, plugin_var2.value.as_id);
+  EXPECT_EQ(0, tracker_.GetRefCountForObject(plugin_var));
+  EXPECT_EQ(2, tracker_.GetTrackedWithNoReferenceCountForObject(plugin_var));
+
+  // Now release those tracked items, the reference should be freed.
+  tracker_.StopTrackingObjectWithNoReference(plugin_var);
+  EXPECT_EQ(1, tracker_.GetTrackedWithNoReferenceCountForObject(plugin_var));
+  tracker_.StopTrackingObjectWithNoReference(plugin_var);
+  EXPECT_EQ(-1, tracker_.GetTrackedWithNoReferenceCountForObject(plugin_var));
+}
+
+}  // namespace proxy
+}  // namespace pp