210 lines
7.7 KiB
C++
210 lines
7.7 KiB
C++
//===- PassRegistry.cpp - Pass Registration Implementation ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the PassRegistry, with which passes are registered on
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// initialization, and supports the PassManager in dependency resolution.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/PassRegistry.h"
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#include "llvm/PassSupport.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/Mutex.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/Function.h"
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#include <vector>
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using namespace llvm;
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// FIXME: We use ManagedStatic to erase the pass registrar on shutdown.
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// Unfortunately, passes are registered with static ctors, and having
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// llvm_shutdown clear this map prevents successful resurrection after
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// llvm_shutdown is run. Ideally we should find a solution so that we don't
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// leak the map, AND can still resurrect after shutdown.
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static ManagedStatic<PassRegistry> PassRegistryObj;
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PassRegistry *PassRegistry::getPassRegistry() {
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return &*PassRegistryObj;
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}
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static ManagedStatic<sys::SmartMutex<true> > Lock;
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//===----------------------------------------------------------------------===//
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// PassRegistryImpl
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//
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namespace {
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struct PassRegistryImpl {
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/// PassInfoMap - Keep track of the PassInfo object for each registered pass.
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typedef DenseMap<const void*, const PassInfo*> MapType;
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MapType PassInfoMap;
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typedef StringMap<const PassInfo*> StringMapType;
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StringMapType PassInfoStringMap;
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/// AnalysisGroupInfo - Keep track of information for each analysis group.
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struct AnalysisGroupInfo {
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SmallPtrSet<const PassInfo *, 8> Implementations;
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};
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DenseMap<const PassInfo*, AnalysisGroupInfo> AnalysisGroupInfoMap;
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std::vector<const PassInfo*> ToFree;
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std::vector<PassRegistrationListener*> Listeners;
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};
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} // end anonymous namespace
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void *PassRegistry::getImpl() const {
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if (!pImpl)
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pImpl = new PassRegistryImpl();
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return pImpl;
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}
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//===----------------------------------------------------------------------===//
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// Accessors
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//
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PassRegistry::~PassRegistry() {
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sys::SmartScopedLock<true> Guard(*Lock);
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PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(pImpl);
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for (std::vector<const PassInfo*>::iterator I = Impl->ToFree.begin(),
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E = Impl->ToFree.end(); I != E; ++I)
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delete *I;
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delete Impl;
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pImpl = 0;
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}
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const PassInfo *PassRegistry::getPassInfo(const void *TI) const {
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sys::SmartScopedLock<true> Guard(*Lock);
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PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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PassRegistryImpl::MapType::const_iterator I = Impl->PassInfoMap.find(TI);
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return I != Impl->PassInfoMap.end() ? I->second : 0;
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}
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const PassInfo *PassRegistry::getPassInfo(StringRef Arg) const {
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sys::SmartScopedLock<true> Guard(*Lock);
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PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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PassRegistryImpl::StringMapType::const_iterator
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I = Impl->PassInfoStringMap.find(Arg);
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return I != Impl->PassInfoStringMap.end() ? I->second : 0;
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}
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//===----------------------------------------------------------------------===//
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// Pass Registration mechanism
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//
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void PassRegistry::registerPass(const PassInfo &PI, bool ShouldFree) {
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sys::SmartScopedLock<true> Guard(*Lock);
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PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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bool Inserted =
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Impl->PassInfoMap.insert(std::make_pair(PI.getTypeInfo(),&PI)).second;
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assert(Inserted && "Pass registered multiple times!");
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(void)Inserted;
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Impl->PassInfoStringMap[PI.getPassArgument()] = &PI;
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// Notify any listeners.
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for (std::vector<PassRegistrationListener*>::iterator
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I = Impl->Listeners.begin(), E = Impl->Listeners.end(); I != E; ++I)
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(*I)->passRegistered(&PI);
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if (ShouldFree) Impl->ToFree.push_back(&PI);
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}
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void PassRegistry::unregisterPass(const PassInfo &PI) {
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sys::SmartScopedLock<true> Guard(*Lock);
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PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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PassRegistryImpl::MapType::iterator I =
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Impl->PassInfoMap.find(PI.getTypeInfo());
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assert(I != Impl->PassInfoMap.end() && "Pass registered but not in map!");
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// Remove pass from the map.
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Impl->PassInfoMap.erase(I);
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Impl->PassInfoStringMap.erase(PI.getPassArgument());
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}
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void PassRegistry::enumerateWith(PassRegistrationListener *L) {
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sys::SmartScopedLock<true> Guard(*Lock);
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PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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for (PassRegistryImpl::MapType::const_iterator I = Impl->PassInfoMap.begin(),
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E = Impl->PassInfoMap.end(); I != E; ++I)
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L->passEnumerate(I->second);
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}
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/// Analysis Group Mechanisms.
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void PassRegistry::registerAnalysisGroup(const void *InterfaceID,
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const void *PassID,
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PassInfo& Registeree,
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bool isDefault,
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bool ShouldFree) {
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PassInfo *InterfaceInfo = const_cast<PassInfo*>(getPassInfo(InterfaceID));
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if (InterfaceInfo == 0) {
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// First reference to Interface, register it now.
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registerPass(Registeree);
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InterfaceInfo = &Registeree;
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}
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assert(Registeree.isAnalysisGroup() &&
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"Trying to join an analysis group that is a normal pass!");
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if (PassID) {
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PassInfo *ImplementationInfo = const_cast<PassInfo*>(getPassInfo(PassID));
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assert(ImplementationInfo &&
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"Must register pass before adding to AnalysisGroup!");
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sys::SmartScopedLock<true> Guard(*Lock);
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// Make sure we keep track of the fact that the implementation implements
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// the interface.
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ImplementationInfo->addInterfaceImplemented(InterfaceInfo);
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PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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PassRegistryImpl::AnalysisGroupInfo &AGI =
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Impl->AnalysisGroupInfoMap[InterfaceInfo];
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assert(AGI.Implementations.count(ImplementationInfo) == 0 &&
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"Cannot add a pass to the same analysis group more than once!");
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AGI.Implementations.insert(ImplementationInfo);
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if (isDefault) {
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assert(InterfaceInfo->getNormalCtor() == 0 &&
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"Default implementation for analysis group already specified!");
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assert(ImplementationInfo->getNormalCtor() &&
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"Cannot specify pass as default if it does not have a default ctor");
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InterfaceInfo->setNormalCtor(ImplementationInfo->getNormalCtor());
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}
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}
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PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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if (ShouldFree) Impl->ToFree.push_back(&Registeree);
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}
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void PassRegistry::addRegistrationListener(PassRegistrationListener *L) {
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sys::SmartScopedLock<true> Guard(*Lock);
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PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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Impl->Listeners.push_back(L);
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}
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void PassRegistry::removeRegistrationListener(PassRegistrationListener *L) {
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sys::SmartScopedLock<true> Guard(*Lock);
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// NOTE: This is necessary, because removeRegistrationListener() can be called
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// as part of the llvm_shutdown sequence. Since we have no control over the
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// order of that sequence, we need to gracefully handle the case where the
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// PassRegistry is destructed before the object that triggers this call.
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if (!pImpl) return;
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PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
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std::vector<PassRegistrationListener*>::iterator I =
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std::find(Impl->Listeners.begin(), Impl->Listeners.end(), L);
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assert(I != Impl->Listeners.end() &&
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"PassRegistrationListener not registered!");
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Impl->Listeners.erase(I);
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}
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