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-rw-r--r--xpcom/tests/gtest/TestCOMPtr.cpp436
1 files changed, 436 insertions, 0 deletions
diff --git a/xpcom/tests/gtest/TestCOMPtr.cpp b/xpcom/tests/gtest/TestCOMPtr.cpp
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+++ b/xpcom/tests/gtest/TestCOMPtr.cpp
@@ -0,0 +1,436 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsCOMPtr.h"
+#include "gtest/gtest.h"
+
+#include "mozilla/gtest/MozAssertions.h"
+#include "mozilla/Unused.h"
+
+#define NS_IFOO_IID \
+ { \
+ 0x6f7652e0, 0xee43, 0x11d1, { \
+ 0x9c, 0xc3, 0x00, 0x60, 0x08, 0x8c, 0xa6, 0xb3 \
+ } \
+ }
+
+namespace TestCOMPtr {
+
+class IFoo : public nsISupports {
+ public:
+ NS_DECLARE_STATIC_IID_ACCESSOR(NS_IFOO_IID)
+
+ public:
+ IFoo();
+ // virtual dtor because IBar uses our Release()
+ virtual ~IFoo();
+
+ NS_IMETHOD_(MozExternalRefCountType) AddRef() override;
+ NS_IMETHOD_(MozExternalRefCountType) Release() override;
+ NS_IMETHOD QueryInterface(const nsIID&, void**) override;
+
+ unsigned int refcount_;
+
+ static int total_constructions_;
+ static int total_destructions_;
+ static int total_queries_;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(IFoo, NS_IFOO_IID)
+
+int IFoo::total_constructions_;
+int IFoo::total_destructions_;
+int IFoo::total_queries_;
+
+IFoo::IFoo() : refcount_(0) { ++total_constructions_; }
+
+IFoo::~IFoo() { ++total_destructions_; }
+
+MozExternalRefCountType IFoo::AddRef() {
+ ++refcount_;
+ return refcount_;
+}
+
+MozExternalRefCountType IFoo::Release() {
+ int newcount = --refcount_;
+
+ if (newcount == 0) {
+ delete this;
+ }
+
+ return newcount;
+}
+
+nsresult IFoo::QueryInterface(const nsIID& aIID, void** aResult) {
+ total_queries_++;
+
+ nsISupports* rawPtr = 0;
+ nsresult status = NS_OK;
+
+ if (aIID.Equals(NS_GET_IID(IFoo)))
+ rawPtr = this;
+ else {
+ nsID iid_of_ISupports = NS_ISUPPORTS_IID;
+ if (aIID.Equals(iid_of_ISupports))
+ rawPtr = static_cast<nsISupports*>(this);
+ else
+ status = NS_ERROR_NO_INTERFACE;
+ }
+
+ NS_IF_ADDREF(rawPtr);
+ *aResult = rawPtr;
+
+ return status;
+}
+
+static nsresult CreateIFoo(void** result)
+// a typical factory function (that calls AddRef)
+{
+ auto* foop = new IFoo;
+
+ foop->AddRef();
+ *result = foop;
+
+ return NS_OK;
+}
+
+static void set_a_IFoo(nsCOMPtr<IFoo>* result) {
+ // Various places in this file do a static_cast to nsISupports* in order to
+ // make the QI non-trivial, to avoid hitting a static assert.
+ nsCOMPtr<IFoo> foop(do_QueryInterface(static_cast<nsISupports*>(new IFoo)));
+ *result = foop;
+}
+
+static nsCOMPtr<IFoo> return_a_IFoo() {
+ nsCOMPtr<IFoo> foop(do_QueryInterface(static_cast<nsISupports*>(new IFoo)));
+ return foop;
+}
+
+#define NS_IBAR_IID \
+ { \
+ 0x6f7652e1, 0xee43, 0x11d1, { \
+ 0x9c, 0xc3, 0x00, 0x60, 0x08, 0x8c, 0xa6, 0xb3 \
+ } \
+ }
+
+class IBar : public IFoo {
+ public:
+ NS_DECLARE_STATIC_IID_ACCESSOR(NS_IBAR_IID)
+
+ public:
+ IBar();
+ ~IBar() override;
+
+ NS_IMETHOD QueryInterface(const nsIID&, void**) override;
+
+ static int total_destructions_;
+ static int total_queries_;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(IBar, NS_IBAR_IID)
+
+int IBar::total_destructions_;
+int IBar::total_queries_;
+
+IBar::IBar() = default;
+
+IBar::~IBar() { total_destructions_++; }
+
+nsresult IBar::QueryInterface(const nsID& aIID, void** aResult) {
+ total_queries_++;
+
+ nsISupports* rawPtr = 0;
+ nsresult status = NS_OK;
+
+ if (aIID.Equals(NS_GET_IID(IBar)))
+ rawPtr = this;
+ else if (aIID.Equals(NS_GET_IID(IFoo)))
+ rawPtr = static_cast<IFoo*>(this);
+ else {
+ nsID iid_of_ISupports = NS_ISUPPORTS_IID;
+ if (aIID.Equals(iid_of_ISupports))
+ rawPtr = static_cast<nsISupports*>(this);
+ else
+ status = NS_ERROR_NO_INTERFACE;
+ }
+
+ NS_IF_ADDREF(rawPtr);
+ *aResult = rawPtr;
+
+ return status;
+}
+
+static nsresult CreateIBar(void** result)
+// a typical factory function (that calls AddRef)
+{
+ auto* barp = new IBar;
+
+ barp->AddRef();
+ *result = barp;
+
+ return NS_OK;
+}
+
+static void AnIFooPtrPtrContext(IFoo**) {}
+
+static void AVoidPtrPtrContext(void**) {}
+
+static void AnISupportsPtrPtrContext(nsISupports**) {}
+
+} // namespace TestCOMPtr
+
+using namespace TestCOMPtr;
+
+TEST(COMPtr, Bloat_Raw_Unsafe)
+{
+ // ER: I'm not sure what this is testing...
+ IBar* barP = 0;
+ nsresult rv = CreateIBar(reinterpret_cast<void**>(&barP));
+ ASSERT_NS_SUCCEEDED(rv);
+ ASSERT_TRUE(barP);
+
+ IFoo* fooP = 0;
+ rv = barP->QueryInterface(NS_GET_IID(IFoo), reinterpret_cast<void**>(&fooP));
+ ASSERT_NS_SUCCEEDED(rv);
+ ASSERT_TRUE(fooP);
+
+ NS_RELEASE(fooP);
+ NS_RELEASE(barP);
+}
+
+TEST(COMPtr, Bloat_Smart)
+{
+ // ER: I'm not sure what this is testing...
+ nsCOMPtr<IBar> barP;
+ nsresult rv = CreateIBar(getter_AddRefs(barP));
+ ASSERT_NS_SUCCEEDED(rv);
+ ASSERT_TRUE(barP);
+
+ nsCOMPtr<IFoo> fooP(do_QueryInterface(static_cast<nsISupports*>(barP), &rv));
+ ASSERT_NS_SUCCEEDED(rv);
+ ASSERT_TRUE(fooP);
+}
+
+TEST(COMPtr, AddRefAndRelease)
+{
+ IFoo::total_constructions_ = 0;
+ IFoo::total_destructions_ = 0;
+ IBar::total_destructions_ = 0;
+
+ {
+ nsCOMPtr<IFoo> foop(do_QueryInterface(static_cast<nsISupports*>(new IFoo)));
+ ASSERT_EQ(foop->refcount_, (unsigned int)1);
+ ASSERT_EQ(IFoo::total_constructions_, 1);
+ ASSERT_EQ(IFoo::total_destructions_, 0);
+
+ foop = do_QueryInterface(static_cast<nsISupports*>(new IFoo));
+ ASSERT_EQ(foop->refcount_, (unsigned int)1);
+ ASSERT_EQ(IFoo::total_constructions_, 2);
+ ASSERT_EQ(IFoo::total_destructions_, 1);
+
+ // [Shouldn't compile] Is it a compile time error to try to |AddRef| by
+ // hand?
+ // foop->AddRef();
+
+ // [Shouldn't compile] Is it a compile time error to try to |Release| be
+ // hand?
+ // foop->Release();
+
+ // [Shouldn't compile] Is it a compile time error to try to |delete| an
+ // |nsCOMPtr|?
+ // delete foop;
+
+ static_cast<IFoo*>(foop)->AddRef();
+ ASSERT_EQ(foop->refcount_, (unsigned int)2);
+ ASSERT_EQ(IFoo::total_constructions_, 2);
+ ASSERT_EQ(IFoo::total_destructions_, 1);
+
+ static_cast<IFoo*>(foop)->Release();
+ ASSERT_EQ(foop->refcount_, (unsigned int)1);
+ ASSERT_EQ(IFoo::total_constructions_, 2);
+ ASSERT_EQ(IFoo::total_destructions_, 1);
+ }
+
+ ASSERT_EQ(IFoo::total_constructions_, 2);
+ ASSERT_EQ(IFoo::total_destructions_, 2);
+
+ {
+ nsCOMPtr<IFoo> foop(do_QueryInterface(static_cast<nsISupports*>(new IBar)));
+ mozilla::Unused << foop;
+ }
+
+ ASSERT_EQ(IBar::total_destructions_, 1);
+}
+
+TEST(COMPtr, Comparison)
+{
+ IFoo::total_constructions_ = 0;
+ IFoo::total_destructions_ = 0;
+
+ {
+ nsCOMPtr<IFoo> foo1p(
+ do_QueryInterface(static_cast<nsISupports*>(new IFoo)));
+ nsCOMPtr<IFoo> foo2p(
+ do_QueryInterface(static_cast<nsISupports*>(new IFoo)));
+
+ ASSERT_EQ(IFoo::total_constructions_, 2);
+
+ // Test != operator
+ ASSERT_NE(foo1p, foo2p);
+ ASSERT_NE(foo1p, foo2p.get());
+
+ // Test == operator
+ foo1p = foo2p;
+
+ ASSERT_EQ(IFoo::total_destructions_, 1);
+
+ ASSERT_EQ(foo1p, foo2p);
+ ASSERT_EQ(foo2p, foo2p.get());
+ ASSERT_EQ(foo2p.get(), foo2p);
+
+ // Test () operator
+ ASSERT_TRUE(foo1p);
+
+ ASSERT_EQ(foo1p->refcount_, (unsigned int)2);
+ ASSERT_EQ(foo2p->refcount_, (unsigned int)2);
+ }
+
+ ASSERT_EQ(IFoo::total_destructions_, 2);
+}
+
+TEST(COMPtr, DontAddRef)
+{
+ {
+ auto* raw_foo1p = new IFoo;
+ raw_foo1p->AddRef();
+
+ auto* raw_foo2p = new IFoo;
+ raw_foo2p->AddRef();
+
+ nsCOMPtr<IFoo> foo1p(dont_AddRef(raw_foo1p));
+ ASSERT_EQ(raw_foo1p, foo1p);
+ ASSERT_EQ(foo1p->refcount_, (unsigned int)1);
+
+ nsCOMPtr<IFoo> foo2p;
+ foo2p = dont_AddRef(raw_foo2p);
+ ASSERT_EQ(raw_foo2p, foo2p);
+ ASSERT_EQ(foo2p->refcount_, (unsigned int)1);
+ }
+}
+
+TEST(COMPtr, AssignmentHelpers)
+{
+ IFoo::total_constructions_ = 0;
+ IFoo::total_destructions_ = 0;
+
+ {
+ nsCOMPtr<IFoo> foop;
+ ASSERT_FALSE(foop);
+ CreateIFoo(nsGetterAddRefs<IFoo>(foop));
+ ASSERT_TRUE(foop);
+ }
+
+ ASSERT_EQ(IFoo::total_constructions_, 1);
+ ASSERT_EQ(IFoo::total_destructions_, 1);
+
+ {
+ nsCOMPtr<IFoo> foop;
+ ASSERT_FALSE(foop);
+ CreateIFoo(getter_AddRefs(foop));
+ ASSERT_TRUE(foop);
+ }
+
+ ASSERT_EQ(IFoo::total_constructions_, 2);
+ ASSERT_EQ(IFoo::total_destructions_, 2);
+
+ {
+ nsCOMPtr<IFoo> foop;
+ ASSERT_FALSE(foop);
+ set_a_IFoo(address_of(foop));
+ ASSERT_TRUE(foop);
+
+ ASSERT_EQ(IFoo::total_constructions_, 3);
+ ASSERT_EQ(IFoo::total_destructions_, 2);
+
+ foop = return_a_IFoo();
+ ASSERT_TRUE(foop);
+
+ ASSERT_EQ(IFoo::total_constructions_, 4);
+ ASSERT_EQ(IFoo::total_destructions_, 3);
+ }
+
+ ASSERT_EQ(IFoo::total_constructions_, 4);
+ ASSERT_EQ(IFoo::total_destructions_, 4);
+
+ {
+ nsCOMPtr<IFoo> fooP(do_QueryInterface(static_cast<nsISupports*>(new IFoo)));
+ ASSERT_TRUE(fooP);
+
+ ASSERT_EQ(IFoo::total_constructions_, 5);
+ ASSERT_EQ(IFoo::total_destructions_, 4);
+
+ nsCOMPtr<IFoo> fooP2(std::move(fooP));
+ ASSERT_TRUE(fooP2);
+
+ ASSERT_EQ(IFoo::total_constructions_, 5);
+ ASSERT_EQ(IFoo::total_destructions_, 4);
+ }
+
+ ASSERT_EQ(IFoo::total_constructions_, 5);
+ ASSERT_EQ(IFoo::total_destructions_, 5);
+}
+
+TEST(COMPtr, QueryInterface)
+{
+ IFoo::total_queries_ = 0;
+ IBar::total_queries_ = 0;
+
+ {
+ nsCOMPtr<IFoo> fooP;
+ ASSERT_FALSE(fooP);
+ fooP = do_QueryInterface(static_cast<nsISupports*>(new IFoo));
+ ASSERT_TRUE(fooP);
+ ASSERT_EQ(IFoo::total_queries_, 1);
+
+ nsCOMPtr<IFoo> foo2P;
+
+ // Test that |QueryInterface| _not_ called when assigning a smart-pointer
+ // of the same type.);
+ foo2P = fooP;
+ ASSERT_EQ(IFoo::total_queries_, 1);
+ }
+
+ {
+ nsCOMPtr<IBar> barP(do_QueryInterface(static_cast<nsISupports*>(new IBar)));
+ ASSERT_EQ(IBar::total_queries_, 1);
+
+ // Test that |QueryInterface| is called when assigning a smart-pointer of
+ // a different type.
+ nsCOMPtr<IFoo> fooP(do_QueryInterface(static_cast<nsISupports*>(barP)));
+ ASSERT_EQ(IBar::total_queries_, 2);
+ ASSERT_EQ(IFoo::total_queries_, 1);
+ ASSERT_TRUE(fooP);
+ }
+}
+
+TEST(COMPtr, GetterConversions)
+{
+ // This is just a compilation test. We add a few asserts to keep gtest happy.
+ {
+ nsCOMPtr<IFoo> fooP;
+ ASSERT_FALSE(fooP);
+
+ AnIFooPtrPtrContext(getter_AddRefs(fooP));
+ AVoidPtrPtrContext(getter_AddRefs(fooP));
+ }
+
+ {
+ nsCOMPtr<nsISupports> supportsP;
+ ASSERT_FALSE(supportsP);
+
+ AVoidPtrPtrContext(getter_AddRefs(supportsP));
+ AnISupportsPtrPtrContext(getter_AddRefs(supportsP));
+ }
+}
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