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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/Support/Compiler.h"
#include "llvm/Support/ManagedStatic.h"
static PassRegistry *PassRegistryObj = 0;
PassRegistry *PassRegistry::getPassRegistry() {
// Use double-checked locking to safely initialize the registrar when
// we're running in multithreaded mode.
PassRegistry* tmp = PassRegistryObj;
if (llvm_is_multithreaded()) {
sys::MemoryFence();
if (!tmp) {
llvm_acquire_global_lock();
tmp = PassRegistryObj;
if (!tmp) {
tmp = new PassRegistry();
sys::MemoryFence();
PassRegistryObj = tmp;
}
llvm_release_global_lock();
}
} else if (!tmp) {
PassRegistryObj = new PassRegistry();
}
return PassRegistryObj;
}
namespace {
// FIXME: We use ManagedCleanup to erase the pass registrar on shutdown.
// Unfortunately, passes are registered with static ctors, and having
// llvm_shutdown clear this map prevents successful ressurection 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.
void cleanupPassRegistry(void*) {
if (PassRegistryObj) {
delete PassRegistryObj;
PassRegistryObj = 0;
}
}
ManagedCleanup<&cleanupPassRegistry> registryCleanup ATTRIBUTE_USED;
}
const PassInfo *PassRegistry::getPassInfo(intptr_t TI) const {
sys::SmartScopedLock<true> Guard(Lock);
MapType::const_iterator I = PassInfoMap.find(TI);
return I != PassInfoMap.end() ? I->second : 0;
}
const PassInfo *PassRegistry::getPassInfo(StringRef Arg) const {
sys::SmartScopedLock<true> Guard(Lock);
StringMapType::const_iterator I = PassInfoStringMap.find(Arg);
return I != PassInfoStringMap.end() ? I->second : 0;
}
void PassRegistry::registerPass(const PassInfo &PI) {
sys::SmartScopedLock<true> Guard(Lock);
bool Inserted =
PassInfoMap.insert(std::make_pair(PI.getTypeInfo(),&PI)).second;
assert(Inserted && "Pass registered multiple times!"); Inserted=Inserted;
PassInfoStringMap[PI.getPassArgument()] = &PI;
}
void PassRegistry::unregisterPass(const PassInfo &PI) {
sys::SmartScopedLock<true> Guard(Lock);
MapType::iterator I = PassInfoMap.find(PI.getTypeInfo());
assert(I != PassInfoMap.end() && "Pass registered but not in map!");
// Remove pass from the map.
PassInfoMap.erase(I);
PassInfoStringMap.erase(PI.getPassArgument());
}
void PassRegistry::enumerateWith(PassRegistrationListener *L) {
sys::SmartScopedLock<true> Guard(Lock);
for (MapType::const_iterator I = PassInfoMap.begin(),
E = PassInfoMap.end(); I != E; ++I)
L->passEnumerate(I->second);
}
/// Analysis Group Mechanisms.
void PassRegistry::registerAnalysisGroup(PassInfo *InterfaceInfo,
const PassInfo *ImplementationInfo,
bool isDefault) {
sys::SmartScopedLock<true> Guard(Lock);
AnalysisGroupInfo &AGI = 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() == 0 &&
"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());
}
}
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