tests: Migrated refcnt.cc test from src/unitttest to a gtest

refcnt.cc was previously tested in src/unittest/refcnttest.cc. This has
now been translated into a GTest as faithfully to the original as
possible.

Change-Id: I51f7a3d1e0a85b128c4eebd97cfe79b87406dc29
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/21499
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

1 files changed, 176 insertions, 0 deletions

diff --git a/src/base/refcnt.test.cc b/src/base/refcnt.test.cc
new file mode 100644
index 000000000..a4ff0b517
--- /dev/null
+++ b/src/base/refcnt.test.cc
@@ -0,0 +1,176 @@
+/*
+ * Copyright (c) 2019 The Regents of The University of California
+ * All rights resvered.
+ *
+ * Copyright (c) 2010 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Gabe Black
+ *          Bobby R. Bruce
+ */
+
+#include <gtest/gtest.h>
+
+#include <list>
+
+#include "base/refcnt.hh"
+
+using namespace std;
+
+namespace {
+
+class TestRC;
+typedef list<TestRC *> LiveList;
+LiveList liveList;
+
+int
+liveListSize(){
+    return liveList.size();
+}
+
+class TestRC : public RefCounted
+{
+  protected:
+    LiveList::iterator liveIt;
+
+  public:
+    TestRC()
+    {
+        liveList.push_front(this);
+        liveIt = liveList.begin();
+    }
+
+    ~TestRC()
+    {
+        liveList.erase(liveIt);
+    }
+
+    int testVal;
+};
+typedef RefCountingPtr<TestRC> Ptr;
+
+} // anonymous namespace
+
+TEST(RefcntTest, NullPointerCheck)
+{
+    // Create an empty Ptr and verify it's data pointer is NULL.
+    Ptr nullCheck;
+    EXPECT_EQ(NULL, nullCheck.get());
+    EXPECT_EQ(0, liveListSize());
+}
+
+TEST(RefcntTest, ConstructionFromPointer)
+{
+    // Construct a Ptr from a TestRC pointer.
+    Ptr constFromPointer = new TestRC();
+    EXPECT_EQ(1, liveListSize());
+}
+
+TEST(RefcntTest, ConstructionFromExistingPointer)
+{
+    // Construct a Ptr from an existing Ptr.
+    Ptr constFromPointer1 = new TestRC();
+    Ptr constFromPointer2 = constFromPointer1;
+
+    EXPECT_EQ(1, liveListSize());
+}
+
+TEST(RefcntTest, DestroyPointer)
+{
+    // Test a Ptr being destroyed.
+    Ptr *ptrPtr = new Ptr(new TestRC());
+    EXPECT_EQ(1, liveListSize());
+    delete ptrPtr;
+    EXPECT_EQ(0, liveListSize());
+}
+
+TEST(RefcntTest, AssignmentFromAPointerFromAPointer)
+{
+    // Test assignment from a pointer and from a Ptr.
+    Ptr assignmentTarget;
+    TestRC *assignmentSourcePointer = new TestRC();
+    EXPECT_EQ(liveListSize(), 1);
+    assignmentTarget = assignmentSourcePointer;
+    EXPECT_EQ(liveListSize(), 1);
+    assignmentTarget = NULL;
+    EXPECT_EQ(liveListSize(), 0);
+    Ptr assignmentSourcePtr(new TestRC());
+    EXPECT_EQ(liveListSize(), 1);
+    assignmentTarget = assignmentSourcePtr;
+    EXPECT_EQ(liveListSize(), 1);
+    assignmentSourcePtr = NULL;
+    EXPECT_EQ(liveListSize(), 1);
+    assignmentTarget = NULL;
+    EXPECT_EQ(liveListSize(), 0);
+}
+
+TEST(RefcntTest, AccessToClassPointers)
+{
+    // Test access to members of the pointed to class and dereferencing.
+    TestRC *accessTest = new TestRC();
+    Ptr accessTestPtr = accessTest;
+    accessTest->testVal = 1;
+    EXPECT_EQ(1, accessTestPtr->testVal);
+    EXPECT_EQ(1, (*accessTestPtr).testVal);
+    accessTest->testVal = 2;
+    EXPECT_EQ(2, accessTestPtr->testVal);
+    EXPECT_EQ(2, (*accessTestPtr).testVal);
+    accessTestPtr->testVal = 3;
+    EXPECT_EQ(3, accessTest->testVal);
+    (*accessTestPtr).testVal = 4;
+    EXPECT_EQ(4, accessTest->testVal);
+    accessTestPtr = NULL;
+    accessTest = NULL;
+    EXPECT_EQ(0, liveListSize());
+}
+
+TEST(RefcntTest, BoolAndLogicalNotOperatorOverloads)
+{
+    // Test bool and ! operator overloads.
+    Ptr boolTest = new TestRC();
+    EXPECT_EQ(boolTest, true);
+    EXPECT_EQ(!boolTest, false);
+    boolTest = NULL;
+    EXPECT_FALSE(boolTest);
+    EXPECT_TRUE(!boolTest);
+    EXPECT_EQ(0, liveListSize());
+}
+
+TEST(RefcntTest, EqualityOperators)
+{
+    // Test the equality operators.
+    TestRC *equalTestA = new TestRC();
+    Ptr equalTestAPtr = equalTestA;
+    Ptr equalTestAPtr2 = equalTestA;
+    TestRC *equalTestB = new TestRC();
+    Ptr equalTestBPtr = equalTestB;
+    EXPECT_TRUE(equalTestA == equalTestAPtr);
+    EXPECT_TRUE(equalTestAPtr == equalTestA);
+    EXPECT_TRUE(equalTestAPtr == equalTestAPtr2);
+    EXPECT_TRUE(equalTestA != equalTestBPtr);
+    EXPECT_TRUE(equalTestAPtr != equalTestB);
+    EXPECT_TRUE(equalTestAPtr != equalTestBPtr);
+}
\ No newline at end of file