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| //===- PassRegistry.cpp - Pass Registration Implementation ----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// 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/STLExtras.h"
#include "llvm/PassInfo.h"
#include "llvm/PassSupport.h"
#include "llvm/Support/ManagedStatic.h"
#include <cassert>
#include <memory>
#include <utility>
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;
}
//===----------------------------------------------------------------------===//
// Accessors
//
PassRegistry::~PassRegistry() = default;
const PassInfo *PassRegistry::getPassInfo(const void *TI) const {
sys::SmartScopedReader<true> Guard(Lock);
MapType::const_iterator I = PassInfoMap.find(TI);
return I != PassInfoMap.end() ? I->second : nullptr;
}
const PassInfo *PassRegistry::getPassInfo(StringRef Arg) const {
sys::SmartScopedReader<true> Guard(Lock);
StringMapType::const_iterator I = PassInfoStringMap.find(Arg);
return I != PassInfoStringMap.end() ? I->second : nullptr;
}
//===----------------------------------------------------------------------===//
// Pass Registration mechanism
//
void PassRegistry::registerPass(const PassInfo &PI, bool ShouldFree) {
sys::SmartScopedWriter<true> Guard(Lock);
bool Inserted =
PassInfoMap.insert(std::make_pair(PI.getTypeInfo(), &PI)).second;
assert(Inserted && "Pass registered multiple times!");
(void)Inserted;
PassInfoStringMap[PI.getPassArgument()] = &PI;
// Notify any listeners.
for (auto *Listener : Listeners)
Listener->passRegistered(&PI);
if (ShouldFree)
ToFree.push_back(std::unique_ptr<const PassInfo>(&PI));
}
void PassRegistry::enumerateWith(PassRegistrationListener *L) {
sys::SmartScopedReader<true> Guard(Lock);
for (auto PassInfoPair : PassInfoMap)
L->passEnumerate(PassInfoPair.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);
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());
}
}
if (ShouldFree)
ToFree.push_back(std::unique_ptr<const PassInfo>(&Registeree));
}
void PassRegistry::addRegistrationListener(PassRegistrationListener *L) {
sys::SmartScopedWriter<true> Guard(Lock);
Listeners.push_back(L);
}
void PassRegistry::removeRegistrationListener(PassRegistrationListener *L) {
sys::SmartScopedWriter<true> Guard(Lock);
auto I = llvm::find(Listeners, L);
Listeners.erase(I);
}
|