blob: 6430fb67f6611463bc942fd59614ede2722efc0f [file] [log] [blame]
// Copyright 2018 PDFium 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 "core/fxcrt/autorestorer.h"
#include "core/fxcrt/retain_ptr.h"
#include "core/fxcrt/unowned_ptr.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/pseudo_retainable.h"
TEST(fxcrt, AutoRestorer) {
int x = 5;
{
AutoRestorer<int> restorer(&x);
x = 6;
EXPECT_EQ(6, x);
}
EXPECT_EQ(5, x);
}
TEST(fxcrt, AutoRestorerNoOp) {
int x = 5;
{
AutoRestorer<int> restorer(&x);
EXPECT_EQ(5, x);
}
EXPECT_EQ(5, x);
}
TEST(fxcrt, AutoRestorerAbandon) {
int x = 5;
{
AutoRestorer<int> restorer(&x);
x = 6;
EXPECT_EQ(6, x);
restorer.AbandonRestoration();
}
EXPECT_EQ(6, x);
}
TEST(fxcrt, AutoRestorerUnownedPtr) {
int x = 5;
int y = 6;
UnownedPtr<int> ptr(&x);
{
AutoRestorer<UnownedPtr<int>> restorer(&ptr);
ptr = &y;
EXPECT_EQ(&y, ptr);
}
EXPECT_EQ(&x, ptr);
}
TEST(fxcrt, AutoRestorerUnownedNoOp) {
int x = 5;
UnownedPtr<int> ptr(&x);
{
AutoRestorer<UnownedPtr<int>> restorer(&ptr);
EXPECT_EQ(&x, ptr);
}
EXPECT_EQ(&x, ptr);
}
TEST(fxcrt, AutoRestorerUnownedPtrAbandon) {
int x = 5;
int y = 6;
UnownedPtr<int> ptr(&x);
{
AutoRestorer<UnownedPtr<int>> restorer(&ptr);
ptr = &y;
EXPECT_EQ(&y, ptr);
restorer.AbandonRestoration();
}
EXPECT_EQ(&y, ptr);
}
TEST(fxcrt, AutoRestorerRetainPtr) {
PseudoRetainable obj1;
PseudoRetainable obj2;
RetainPtr<PseudoRetainable> ptr(&obj1);
EXPECT_EQ(1, obj1.retain_count());
EXPECT_EQ(0, obj1.release_count());
{
AutoRestorer<RetainPtr<PseudoRetainable>> restorer(&ptr);
// |obj1| is kept alive by restorer in case it need to be restored.
EXPECT_EQ(2, obj1.retain_count());
EXPECT_EQ(0, obj1.release_count());
ptr.Reset(&obj2);
EXPECT_EQ(&obj2, ptr.Get());
// |obj1| released by |ptr| assignment.
EXPECT_TRUE(obj1.alive());
EXPECT_EQ(2, obj1.retain_count());
EXPECT_EQ(1, obj1.release_count());
// |obj2| now kept alive by |ptr|.
EXPECT_TRUE(obj1.alive());
EXPECT_EQ(1, obj2.retain_count());
EXPECT_EQ(0, obj2.release_count());
}
EXPECT_EQ(&obj1, ptr.Get());
// |obj1| now kept alive again by |ptr|.
EXPECT_TRUE(obj1.alive());
EXPECT_EQ(3, obj1.retain_count());
EXPECT_EQ(2, obj1.release_count());
// |obj2| dead.
EXPECT_FALSE(obj2.alive());
EXPECT_EQ(1, obj2.retain_count());
EXPECT_EQ(1, obj2.release_count());
}
TEST(fxcrt, AutoRestorerRetainPtrNoOp) {
PseudoRetainable obj1;
RetainPtr<PseudoRetainable> ptr(&obj1);
EXPECT_EQ(1, obj1.retain_count());
EXPECT_EQ(0, obj1.release_count());
{
AutoRestorer<RetainPtr<PseudoRetainable>> restorer(&ptr);
EXPECT_EQ(2, obj1.retain_count());
EXPECT_EQ(0, obj1.release_count());
}
EXPECT_EQ(&obj1, ptr.Get());
// Self-reassignement avoided ref churn.
EXPECT_TRUE(obj1.alive());
EXPECT_EQ(2, obj1.retain_count());
EXPECT_EQ(1, obj1.release_count());
}
TEST(fxcrt, AutoRestorerRetainPtrAbandon) {
PseudoRetainable obj1;
PseudoRetainable obj2;
RetainPtr<PseudoRetainable> ptr(&obj1);
EXPECT_EQ(1, obj1.retain_count());
EXPECT_EQ(0, obj1.release_count());
{
AutoRestorer<RetainPtr<PseudoRetainable>> restorer(&ptr);
// |obj1| is kept alive by restorer in case it need to be restored.
EXPECT_EQ(2, obj1.retain_count());
EXPECT_EQ(0, obj1.release_count());
ptr.Reset(&obj2);
EXPECT_EQ(&obj2, ptr.Get());
// |obj1| released by |ptr| assignment.
EXPECT_EQ(2, obj1.retain_count());
EXPECT_EQ(1, obj1.release_count());
// |obj2| now kept alive by |ptr|.
EXPECT_EQ(1, obj2.retain_count());
EXPECT_EQ(0, obj2.release_count());
restorer.AbandonRestoration();
}
EXPECT_EQ(&obj2, ptr.Get());
// |obj1| now dead as a result of abandonment.
EXPECT_FALSE(obj1.alive());
EXPECT_EQ(2, obj1.retain_count());
EXPECT_EQ(2, obj1.release_count());
// |obj2| kept alive by |ptr|.
EXPECT_TRUE(obj2.alive());
EXPECT_EQ(1, obj2.retain_count());
EXPECT_EQ(0, obj2.release_count());
}