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