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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 //
5 // Unit tests for event trace provider.
6 #include "base/win/event_trace_provider.h"
7 #include <new>
8 #include "testing/gtest/include/gtest/gtest.h"
9 #include <initguid.h>  // NOLINT - has to be last
10 
11 namespace {
12 
13 using base::win::EtwTraceProvider;
14 using base::win::EtwMofEvent;
15 
16 // {7F0FD37F-FA3C-4cd6-9242-DF60967A2CB2}
17 DEFINE_GUID(kTestProvider,
18   0x7f0fd37f, 0xfa3c, 0x4cd6, 0x92, 0x42, 0xdf, 0x60, 0x96, 0x7a, 0x2c, 0xb2);
19 
20 // {7F0FD37F-FA3C-4cd6-9242-DF60967A2CB2}
21 DEFINE_GUID(kTestEventClass,
22   0x7f0fd37f, 0xfa3c, 0x4cd6, 0x92, 0x42, 0xdf, 0x60, 0x96, 0x7a, 0x2c, 0xb2);
23 
24 }  // namespace
25 
TEST(EtwTraceProviderTest,ToleratesPreCreateInvocations)26 TEST(EtwTraceProviderTest, ToleratesPreCreateInvocations) {
27   // Because the trace provider is used in logging, it's important that
28   // it be possible to use static provider instances without regard to
29   // whether they've been constructed or destructed.
30   // The interface of the class is designed to tolerate this usage.
31   char buf[sizeof(EtwTraceProvider)] = {0};
32   EtwTraceProvider& provider = reinterpret_cast<EtwTraceProvider&>(buf);
33 
34   EXPECT_EQ(NULL, provider.registration_handle());
35   EXPECT_EQ(NULL, provider.session_handle());
36   EXPECT_EQ(0, provider.enable_flags());
37   EXPECT_EQ(0, provider.enable_level());
38 
39   EXPECT_FALSE(provider.ShouldLog(TRACE_LEVEL_FATAL, 0xfffffff));
40 
41   // We expect these not to crash.
42   provider.Log(kTestEventClass, 0, TRACE_LEVEL_FATAL, "foo");
43   provider.Log(kTestEventClass, 0, TRACE_LEVEL_FATAL, L"foo");
44 
45   EtwMofEvent<1> dummy(kTestEventClass, 0, TRACE_LEVEL_FATAL);
46   DWORD data = 0;
47   dummy.SetField(0, sizeof(data), &data);
48   provider.Log(dummy.get());
49 
50   // Placement-new the provider into our buffer.
51   new (buf) EtwTraceProvider(kTestProvider);
52 
53   // Registration is now safe.
54   EXPECT_EQ(ERROR_SUCCESS, provider.Register());
55 
56   // Destruct the instance, this should unregister it.
57   provider.EtwTraceProvider::~EtwTraceProvider();
58 
59   // And post-destruction, all of the above should still be safe.
60   EXPECT_EQ(NULL, provider.registration_handle());
61   EXPECT_EQ(NULL, provider.session_handle());
62   EXPECT_EQ(0, provider.enable_flags());
63   EXPECT_EQ(0, provider.enable_level());
64 
65   EXPECT_FALSE(provider.ShouldLog(TRACE_LEVEL_FATAL, 0xfffffff));
66 
67   // We expect these not to crash.
68   provider.Log(kTestEventClass, 0, TRACE_LEVEL_FATAL, "foo");
69   provider.Log(kTestEventClass, 0, TRACE_LEVEL_FATAL, L"foo");
70   provider.Log(dummy.get());
71 }
72 
TEST(EtwTraceProviderTest,Initialize)73 TEST(EtwTraceProviderTest, Initialize) {
74   EtwTraceProvider provider(kTestProvider);
75 
76   EXPECT_EQ(NULL, provider.registration_handle());
77   EXPECT_EQ(NULL, provider.session_handle());
78   EXPECT_EQ(0, provider.enable_flags());
79   EXPECT_EQ(0, provider.enable_level());
80 }
81 
TEST(EtwTraceProviderTest,Register)82 TEST(EtwTraceProviderTest, Register) {
83   EtwTraceProvider provider(kTestProvider);
84 
85   ASSERT_EQ(ERROR_SUCCESS, provider.Register());
86   EXPECT_NE(NULL, provider.registration_handle());
87   ASSERT_EQ(ERROR_SUCCESS, provider.Unregister());
88   EXPECT_EQ(NULL, provider.registration_handle());
89 }
90 
TEST(EtwTraceProviderTest,RegisterWithNoNameFails)91 TEST(EtwTraceProviderTest, RegisterWithNoNameFails) {
92   EtwTraceProvider provider;
93 
94   EXPECT_TRUE(provider.Register() != ERROR_SUCCESS);
95 }
96 
TEST(EtwTraceProviderTest,Enable)97 TEST(EtwTraceProviderTest, Enable) {
98   EtwTraceProvider provider(kTestProvider);
99 
100   ASSERT_EQ(ERROR_SUCCESS, provider.Register());
101   EXPECT_NE(NULL, provider.registration_handle());
102 
103   // No session so far.
104   EXPECT_EQ(NULL, provider.session_handle());
105   EXPECT_EQ(0, provider.enable_flags());
106   EXPECT_EQ(0, provider.enable_level());
107 
108   ASSERT_EQ(ERROR_SUCCESS, provider.Unregister());
109   EXPECT_EQ(NULL, provider.registration_handle());
110 }
111