Add InitializationStateDcheck, its base class, and their tests

util/misc/initialization_state_test.cc

+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "util/misc/initialization_state.h"
+
+#include "gtest/gtest.h"
+
+namespace {
+
+using namespace crashpad;
+
+TEST(InitializationState, InitializationState) {
+  InitializationState* initialization_state_pointer;
+  {
+    InitializationState initialization_state;
+    initialization_state_pointer = &initialization_state;
+
+    EXPECT_TRUE(initialization_state.is_uninitialized());
+    EXPECT_FALSE(initialization_state.is_valid());
+
+    initialization_state.set_invalid();
+
+    EXPECT_FALSE(initialization_state.is_uninitialized());
+    EXPECT_FALSE(initialization_state.is_valid());
+
+    initialization_state.set_valid();
+
+    EXPECT_FALSE(initialization_state.is_uninitialized());
+    EXPECT_TRUE(initialization_state.is_valid());
+  }
+
+  // initialization_state_pointer points to something that no longer exists.
+  // This portion of the test is intended to check that after an
+  // InitializationState object goes out of scope, it will not be considered
+  // valid on a use-after-free, assuming that nothing else was written to its
+  // former home in memory.
+  //
+  // This portion of the test is technically not valid C++, but it exists to
+  // test that the behavior is as desired when other code uses the language
+  // improperly.
+  EXPECT_FALSE(initialization_state_pointer->is_uninitialized());
+  EXPECT_FALSE(initialization_state_pointer->is_valid());
+}
+
+}  // namespace