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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* 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/. *
*/
#ifndef mozilla_a11y_IUnknownImpl_h_
#define mozilla_a11y_IUnknownImpl_h_
#include <windows.h>
#undef CreateEvent // thank you windows you're such a helper
#include "nsError.h"
// Avoid warning C4509 like "nonstandard extension used:
// 'AccessibleWrap::[acc_getName]' uses SEH and 'name' has destructor.
// At this point we're catching a crash which is of much greater
// importance than the missing dereference for the nsCOMPtr<>
#ifdef _MSC_VER
# pragma warning(disable : 4509)
#endif
#if defined(__GNUC__) || defined(__clang__)
# define ATTRIBUTE_UNUSED __attribute__((unused))
#else
# define ATTRIBUTE_UNUSED
#endif
namespace mozilla {
namespace a11y {
class AutoRefCnt {
public:
AutoRefCnt() : mValue(0) {}
ULONG operator++() { return ++mValue; }
ULONG operator--() { return --mValue; }
ULONG operator++(int) { return ++mValue; }
ULONG operator--(int) { return --mValue; }
operator ULONG() const { return mValue; }
private:
ULONG mValue;
};
} // namespace a11y
} // namespace mozilla
#define DECL_IUNKNOWN \
public: \
virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID, void**); \
ULONG STDMETHODCALLTYPE AddRef() override { \
MOZ_ASSERT(int32_t(mRefCnt) >= 0, "illegal refcnt"); \
++mRefCnt; \
return mRefCnt; \
} \
ULONG STDMETHODCALLTYPE Release() override { \
MOZ_ASSERT(int32_t(mRefCnt) > 0, "dup release"); \
--mRefCnt; \
if (mRefCnt) return mRefCnt; \
\
delete this; \
return 0; \
} \
\
private: \
mozilla::a11y::AutoRefCnt mRefCnt; \
\
public:
#define DECL_IUNKNOWN_INHERITED \
public: \
virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID, void**);
#define IMPL_IUNKNOWN_QUERY_HEAD(Class) \
STDMETHODIMP \
Class::QueryInterface(REFIID aIID, void** aInstancePtr) { \
if (!aInstancePtr) return E_INVALIDARG; \
*aInstancePtr = nullptr; \
\
HRESULT hr ATTRIBUTE_UNUSED = E_NOINTERFACE;
#define IMPL_IUNKNOWN_QUERY_TAIL \
return hr; \
}
#define IMPL_IUNKNOWN_QUERY_TAIL_AGGREGATED(Member) \
return Member->QueryInterface(aIID, aInstancePtr); \
}
#define IMPL_IUNKNOWN_QUERY_TAIL_INHERITED(BaseClass) \
return BaseClass::QueryInterface(aIID, aInstancePtr); \
}
#define IMPL_IUNKNOWN_QUERY_IFACE(Iface) \
if (aIID == IID_##Iface) { \
*aInstancePtr = static_cast<Iface*>(this); \
AddRef(); \
return S_OK; \
}
#define IMPL_IUNKNOWN_QUERY_IFACE_AMBIGIOUS(Iface, aResolveIface) \
if (aIID == IID_##Iface) { \
*aInstancePtr = static_cast<Iface*>(static_cast<aResolveIface*>(this)); \
AddRef(); \
return S_OK; \
}
#define IMPL_IUNKNOWN_QUERY_CLASS(Class) \
hr = Class::QueryInterface(aIID, aInstancePtr); \
if (SUCCEEDED(hr)) return hr;
#define IMPL_IUNKNOWN_QUERY_CLASS_COND(Class, Cond) \
if (Cond) { \
hr = Class::QueryInterface(aIID, aInstancePtr); \
if (SUCCEEDED(hr)) return hr; \
}
#define IMPL_IUNKNOWN_QUERY_AGGR_COND(Member, Cond) \
if (Cond) { \
hr = Member->QueryInterface(aIID, aInstancePtr); \
if (SUCCEEDED(hr)) return hr; \
}
#define IMPL_IUNKNOWN1(Class, I1) \
IMPL_IUNKNOWN_QUERY_HEAD(Class) \
IMPL_IUNKNOWN_QUERY_IFACE(I1); \
IMPL_IUNKNOWN_QUERY_IFACE(IUnknown); \
IMPL_IUNKNOWN_QUERY_TAIL
#define IMPL_IUNKNOWN2(Class, I1, I2) \
IMPL_IUNKNOWN_QUERY_HEAD(Class) \
IMPL_IUNKNOWN_QUERY_IFACE(I1); \
IMPL_IUNKNOWN_QUERY_IFACE(I2); \
IMPL_IUNKNOWN_QUERY_IFACE_AMBIGIOUS(IUnknown, I1); \
IMPL_IUNKNOWN_QUERY_TAIL
#define IMPL_IUNKNOWN_INHERITED1(Class, Super0, Super1) \
IMPL_IUNKNOWN_QUERY_HEAD(Class) \
IMPL_IUNKNOWN_QUERY_CLASS(Super1); \
IMPL_IUNKNOWN_QUERY_TAIL_INHERITED(Super0)
#define IMPL_IUNKNOWN_INHERITED2(Class, Super0, Super1, Super2) \
IMPL_IUNKNOWN_QUERY_HEAD(Class) \
IMPL_IUNKNOWN_QUERY_CLASS(Super1); \
IMPL_IUNKNOWN_QUERY_CLASS(Super2); \
IMPL_IUNKNOWN_QUERY_TAIL_INHERITED(Super0)
/**
* Overrides AddRef and Release to call a specific base class.
* If you are inheriting a single class (e.g. to override some methods), you
* shouldn't need to use this. However, if you are inheriting from a COM
* implementation and also inheriting additional COM interfaces, you will need
* to use this to specify which base implements reference counting.
*/
#define IMPL_IUNKNOWN_REFCOUNTING_INHERITED(BaseClass) \
public: \
ULONG STDMETHODCALLTYPE AddRef() override { return BaseClass::AddRef(); } \
ULONG STDMETHODCALLTYPE Release() override { return BaseClass::Release(); }
namespace mozilla {
namespace a11y {
/**
* Converts nsresult to HRESULT.
*/
HRESULT GetHRESULT(nsresult aResult);
} // namespace a11y
} // namespace mozilla
#endif
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