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Refcounting.cpp
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//===--- Refcounting.cpp - Reference-counting for Swift -------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "swift/Runtime/HeapObject.h"
#include "swift/Runtime/Metadata.h"
#include "gtest/gtest.h"
using namespace swift;
struct TestObject : HeapObject {
size_t *Addr;
size_t Value;
};
static void destroyTestObject(HeapObject *_object) {
auto object = static_cast<TestObject*>(_object);
assert(object->Addr && "object already deallocated");
*object->Addr = object->Value;
object->Addr = nullptr;
swift_deallocObject(object, sizeof(TestObject), alignof(TestObject) - 1);
}
static const FullMetadata<ClassMetadata> TestClassObjectMetadata = {
{ { &destroyTestObject }, { &_TWVBo } },
{ { { MetadataKind::Class } }, 0, /*rodata*/ 1,
ClassFlags::UsesSwift1Refcounting, nullptr, 0, 0, 0, 0, 0 }
};
/// Create an object that, when deallocated, stores the given value to
/// the given pointer.
static TestObject *allocTestObject(size_t *addr, size_t value) {
auto result =
static_cast<TestObject *>(swift_allocObject(&TestClassObjectMetadata,
sizeof(TestObject),
alignof(TestObject) - 1));
result->Addr = addr;
result->Value = value;
return result;
}
TEST(RefcountingTest, release) {
size_t value = 0;
auto object = allocTestObject(&value, 1);
EXPECT_EQ(0u, value);
swift_release(object);
EXPECT_EQ(1u, value);
}
TEST(RefcountingTest, retain_release) {
size_t value = 0;
auto object = allocTestObject(&value, 1);
EXPECT_EQ(0u, value);
swift_retain(object);
EXPECT_EQ(0u, value);
swift_release(object);
EXPECT_EQ(0u, value);
swift_release(object);
EXPECT_EQ(1u, value);
}
TEST(RefcountingTest, pin_unpin) {
size_t value = 0;
auto object = allocTestObject(&value, 1);
EXPECT_EQ(0u, value);
auto pinResult = swift_tryPin(object);
EXPECT_EQ(object, pinResult);
EXPECT_EQ(0u, value);
swift_release(object);
EXPECT_EQ(0u, value);
swift_unpin(object);
EXPECT_EQ(1u, value);
}
TEST(RefcountingTest, pin_pin_unpin_unpin) {
size_t value = 0;
auto object = allocTestObject(&value, 1);
EXPECT_EQ(0u, value);
auto pinResult = swift_tryPin(object);
EXPECT_EQ(object, pinResult);
EXPECT_EQ(0u, value);
auto pinResult2 = swift_tryPin(object);
EXPECT_EQ(nullptr, pinResult2);
EXPECT_EQ(0u, value);
swift_unpin(pinResult2);
EXPECT_EQ(0u, value);
swift_release(object);
EXPECT_EQ(0u, value);
swift_unpin(object);
EXPECT_EQ(1u, value);
}
TEST(RefcountingTest, retain_release_n) {
size_t value = 0;
auto object = allocTestObject(&value, 1);
EXPECT_EQ(0u, value);
swift_retain_n(object, 32);
swift_retain(object);
EXPECT_EQ(0u, value);
EXPECT_EQ(34u, swift_retainCount(object));
swift_release_n(object, 31);
EXPECT_EQ(0u, value);
EXPECT_EQ(3u, swift_retainCount(object));
swift_release(object);
EXPECT_EQ(0u, value);
EXPECT_EQ(2u, swift_retainCount(object));
swift_release_n(object, 1);
EXPECT_EQ(0u, value);
EXPECT_EQ(1u, swift_retainCount(object));
}
TEST(RefcountingTest, unknown_retain_release_n) {
size_t value = 0;
auto object = allocTestObject(&value, 1);
EXPECT_EQ(0u, value);
swift_unknownRetain_n(object, 32);
swift_unknownRetain(object);
EXPECT_EQ(0u, value);
EXPECT_EQ(34u, swift_retainCount(object));
swift_unknownRelease_n(object, 31);
EXPECT_EQ(0u, value);
EXPECT_EQ(3u, swift_retainCount(object));
swift_unknownRelease(object);
EXPECT_EQ(0u, value);
EXPECT_EQ(2u, swift_retainCount(object));
swift_unknownRelease_n(object, 1);
EXPECT_EQ(0u, value);
EXPECT_EQ(1u, swift_retainCount(object));
}
TEST(RefcountingTest, unowned_retain_release_n) {
size_t value = 0;
auto object = allocTestObject(&value, 1);
EXPECT_EQ(0u, value);
swift_unownedRetain_n(object, 32);
swift_unownedRetain(object);
EXPECT_EQ(34u, swift_unownedRetainCount(object));
swift_unownedRelease_n(object, 31);
EXPECT_EQ(3u, swift_unownedRetainCount(object));
swift_unownedRelease(object);
EXPECT_EQ(2u, swift_unownedRetainCount(object));
swift_unownedRelease_n(object, 1);
EXPECT_EQ(1u, swift_unownedRetainCount(object));
swift_release(object);
EXPECT_EQ(1u, value);
}
/////////////////////////////////////////
// Non-atomic reference counting tests //
/////////////////////////////////////////
TEST(RefcountingTest, nonatomic_release) {
size_t value = 0;
auto object = allocTestObject(&value, 1);
EXPECT_EQ(0u, value);
swift_nonatomic_release(object);
EXPECT_EQ(1u, value);
}
TEST(RefcountingTest, nonatomic_retain_release) {
size_t value = 0;
auto object = allocTestObject(&value, 1);
EXPECT_EQ(0u, value);
swift_nonatomic_retain(object);
EXPECT_EQ(0u, value);
swift_nonatomic_release(object);
EXPECT_EQ(0u, value);
swift_nonatomic_release(object);
EXPECT_EQ(1u, value);
}
TEST(RefcountingTest, nonatomic_pin_unpin) {
size_t value = 0;
auto object = allocTestObject(&value, 1);
EXPECT_EQ(0u, value);
auto pinResult = swift_nonatomic_tryPin(object);
EXPECT_EQ(object, pinResult);
EXPECT_EQ(0u, value);
swift_nonatomic_release(object);
EXPECT_EQ(0u, value);
swift_nonatomic_unpin(object);
EXPECT_EQ(1u, value);
}
TEST(RefcountingTest, nonatomic_pin_pin_unpin_unpin) {
size_t value = 0;
auto object = allocTestObject(&value, 1);
EXPECT_EQ(0u, value);
auto pinResult = swift_nonatomic_tryPin(object);
EXPECT_EQ(object, pinResult);
EXPECT_EQ(0u, value);
auto pinResult2 = swift_nonatomic_tryPin(object);
EXPECT_EQ(nullptr, pinResult2);
EXPECT_EQ(0u, value);
swift_nonatomic_unpin(pinResult2);
EXPECT_EQ(0u, value);
swift_nonatomic_release(object);
EXPECT_EQ(0u, value);
swift_nonatomic_unpin(object);
EXPECT_EQ(1u, value);
}
TEST(RefcountingTest, nonatomic_retain_release_n) {
size_t value = 0;
auto object = allocTestObject(&value, 1);
EXPECT_EQ(0u, value);
swift_nonatomic_retain_n(object, 32);
swift_nonatomic_retain(object);
EXPECT_EQ(0u, value);
EXPECT_EQ(34u, swift_retainCount(object));
swift_nonatomic_release_n(object, 31);
EXPECT_EQ(0u, value);
EXPECT_EQ(3u, swift_retainCount(object));
swift_nonatomic_release(object);
EXPECT_EQ(0u, value);
EXPECT_EQ(2u, swift_retainCount(object));
swift_nonatomic_release_n(object, 1);
EXPECT_EQ(0u, value);
EXPECT_EQ(1u, swift_retainCount(object));
}
TEST(RefcountingTest, nonatomic_unknown_retain_release_n) {
size_t value = 0;
auto object = allocTestObject(&value, 1);
EXPECT_EQ(0u, value);
swift_nonatomic_unknownRetain_n(object, 32);
swift_nonatomic_unknownRetain(object);
EXPECT_EQ(0u, value);
EXPECT_EQ(34u, swift_retainCount(object));
swift_nonatomic_unknownRelease_n(object, 31);
EXPECT_EQ(0u, value);
EXPECT_EQ(3u, swift_retainCount(object));
swift_nonatomic_unknownRelease(object);
EXPECT_EQ(0u, value);
EXPECT_EQ(2u, swift_retainCount(object));
swift_nonatomic_unknownRelease_n(object, 1);
EXPECT_EQ(0u, value);
EXPECT_EQ(1u, swift_retainCount(object));
}