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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
* This file is part of the LibreOffice project.
*
* 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 <comphelper/compbase.hxx>
#include <cppuhelper/queryinterface.hxx>
#include <sal/log.hxx>
#include <osl/diagnose.h>
namespace comphelper
{
WeakComponentImplHelperBase::~WeakComponentImplHelperBase() {}
// css::lang::XComponent
void SAL_CALL WeakComponentImplHelperBase::dispose()
{
std::unique_lock aGuard(m_aMutex);
if (m_bDisposed)
return;
m_bDisposed = true;
disposing(aGuard);
if (!aGuard.owns_lock())
aGuard.lock();
css::lang::EventObject aEvt(static_cast<OWeakObject*>(this));
maEventListeners.disposeAndClear(aGuard, aEvt);
}
void WeakComponentImplHelperBase::disposing(std::unique_lock<std::mutex>&) {}
void SAL_CALL WeakComponentImplHelperBase::addEventListener(
css::uno::Reference<css::lang::XEventListener> const& rxListener)
{
std::unique_lock aGuard(m_aMutex);
if (m_bDisposed)
return;
maEventListeners.addInterface(aGuard, rxListener);
}
void SAL_CALL WeakComponentImplHelperBase::removeEventListener(
css::uno::Reference<css::lang::XEventListener> const& rxListener)
{
std::unique_lock aGuard(m_aMutex);
maEventListeners.removeInterface(aGuard, rxListener);
}
css::uno::Any SAL_CALL WeakComponentImplHelperBase::queryInterface(css::uno::Type const& rType)
{
css::uno::Any aReturn = ::cppu::queryInterface(rType, static_cast<css::uno::XWeak*>(this),
static_cast<css::lang::XComponent*>(this));
if (aReturn.hasValue())
return aReturn;
return OWeakObject::queryInterface(rType);
}
static void checkInterface(css::uno::Type const& rType)
{
if (css::uno::TypeClass_INTERFACE != rType.getTypeClass())
{
OUString msg("querying for interface \"" + rType.getTypeName() + "\": no interface type!");
SAL_WARN("cppuhelper", msg);
throw css::uno::RuntimeException(msg);
}
}
static bool isXInterface(rtl_uString* pStr)
{
return OUString::unacquired(&pStr) == "com.sun.star.uno.XInterface";
}
static bool td_equals(typelib_TypeDescriptionReference const* pTDR1,
typelib_TypeDescriptionReference const* pTDR2)
{
return ((pTDR1 == pTDR2)
|| OUString::unacquired(&pTDR1->pTypeName) == OUString::unacquired(&pTDR2->pTypeName));
}
static cppu::type_entry* getTypeEntries(cppu::class_data* cd)
{
cppu::type_entry* pEntries = cd->m_typeEntries;
if (!cd->m_storedTypeRefs) // not inited?
{
static std::mutex aMutex;
std::scoped_lock guard(aMutex);
if (!cd->m_storedTypeRefs) // not inited?
{
// get all types
for (sal_Int32 n = cd->m_nTypes; n--;)
{
cppu::type_entry* pEntry = &pEntries[n];
css::uno::Type const& rType = (*pEntry->m_type.getCppuType)(nullptr);
OSL_ENSURE(rType.getTypeClass() == css::uno::TypeClass_INTERFACE,
"### wrong helper init: expected interface!");
OSL_ENSURE(
!isXInterface(rType.getTypeLibType()->pTypeName),
"### want to implement XInterface: template argument is XInterface?!?!?!");
if (rType.getTypeClass() != css::uno::TypeClass_INTERFACE)
{
OUString msg("type \"" + rType.getTypeName() + "\" is no interface type!");
SAL_WARN("cppuhelper", msg);
throw css::uno::RuntimeException(msg);
}
// ref is statically held by getCppuType()
pEntry->m_type.typeRef = rType.getTypeLibType();
}
OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
cd->m_storedTypeRefs = true;
}
}
else
{
OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
}
return pEntries;
}
static void* makeInterface(sal_IntPtr nOffset, void* that)
{
return (static_cast<char*>(that) + nOffset);
}
static bool recursivelyFindType(typelib_TypeDescriptionReference const* demandedType,
typelib_InterfaceTypeDescription const* type, sal_IntPtr* offset)
{
// This code assumes that the vtables of a multiple-inheritance class (the
// offset amount by which to adjust the this pointer) follow one another in
// the object layout, and that they contain slots for the inherited classes
// in a specific order. In theory, that need not hold for any given
// platform; in practice, it seems to work well on all supported platforms:
next:
for (sal_Int32 i = 0; i < type->nBaseTypes; ++i)
{
if (i > 0)
{
*offset += sizeof(void*);
}
typelib_InterfaceTypeDescription const* base = type->ppBaseTypes[i];
// ignore XInterface:
if (base->nBaseTypes > 0)
{
if (td_equals(reinterpret_cast<typelib_TypeDescriptionReference const*>(base),
demandedType))
{
return true;
}
// Profiling showed that it is important to speed up the common case
// of only one base:
if (type->nBaseTypes == 1)
{
type = base;
goto next;
}
if (recursivelyFindType(demandedType, base, offset))
{
return true;
}
}
}
return false;
}
static void* queryDeepNoXInterface(typelib_TypeDescriptionReference const* pDemandedTDR,
cppu::class_data* cd, void* that)
{
cppu::type_entry* pEntries = getTypeEntries(cd);
sal_Int32 nTypes = cd->m_nTypes;
sal_Int32 n;
// try top interfaces without getting td
for (n = 0; n < nTypes; ++n)
{
if (td_equals(pEntries[n].m_type.typeRef, pDemandedTDR))
{
return makeInterface(pEntries[n].m_offset, that);
}
}
// query deep getting td
for (n = 0; n < nTypes; ++n)
{
typelib_TypeDescription* pTD = nullptr;
TYPELIB_DANGER_GET(&pTD, pEntries[n].m_type.typeRef);
if (pTD)
{
// exclude top (already tested) and bottom (XInterface) interface
OSL_ENSURE(reinterpret_cast<typelib_InterfaceTypeDescription*>(pTD)->nBaseTypes > 0,
"### want to implement XInterface:"
" template argument is XInterface?!?!?!");
sal_IntPtr offset = pEntries[n].m_offset;
bool found = recursivelyFindType(
pDemandedTDR, reinterpret_cast<typelib_InterfaceTypeDescription*>(pTD), &offset);
TYPELIB_DANGER_RELEASE(pTD);
if (found)
{
return makeInterface(offset, that);
}
}
else
{
OUString msg("cannot get type description for type \""
+ OUString::unacquired(&pEntries[n].m_type.typeRef->pTypeName) + "\"!");
SAL_WARN("cppuhelper", msg);
throw css::uno::RuntimeException(msg);
}
}
return nullptr;
}
css::uno::Any WeakComponentImplHelper_query(css::uno::Type const& rType, cppu::class_data* cd,
WeakComponentImplHelperBase* pBase)
{
checkInterface(rType);
typelib_TypeDescriptionReference* pTDR = rType.getTypeLibType();
// shortcut XInterface to WeakComponentImplHelperBase
if (!isXInterface(pTDR->pTypeName))
{
void* p = queryDeepNoXInterface(pTDR, cd, pBase);
if (p)
{
return css::uno::Any(&p, pTDR);
}
}
return pBase->comphelper::WeakComponentImplHelperBase::queryInterface(rType);
}
} // namespace comphelper
/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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