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When registering a pass, a pass can now specify a second construct that takes as argument a pointer to TargetMachine. The PassInfo class has been updated to reflect that possibility. If such a constructor exists opt will use it instead of the default constructor when instantiating the pass. Since such IR passes are supposed to be rare, no specific support has been added to this commit to allow an easy registration of such a pass. In other words, for such pass, the initialization function has to be hand-written (see CodeGenPrepare for instance). Now, codegenprepare can be tested using opt: opt -codegenprepare -mtriple=mytriple input.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199430 91177308-0d34-0410-b5e6-96231b3b80d8
213 lines
7.8 KiB
C++
213 lines
7.8 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/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/IR/Function.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/Support/RWMutex.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::SmartRWMutex<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::SmartScopedWriter<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::SmartScopedReader<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::SmartScopedReader<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::SmartScopedWriter<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::SmartScopedWriter<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::SmartScopedReader<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::SmartScopedWriter<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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InterfaceInfo->setTargetMachineCtor(
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ImplementationInfo->getTargetMachineCtor());
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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::SmartScopedWriter<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::SmartScopedWriter<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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