llvm/lib/VMCore/Pass.cpp
Jeffrey Yasskin f0356fe140 Kill ModuleProvider and ghost linkage by inverting the relationship between
Modules and ModuleProviders. Because the "ModuleProvider" simply materializes
GlobalValues now, and doesn't provide modules, it's renamed to
"GVMaterializer". Code that used to need a ModuleProvider to materialize
Functions can now materialize the Functions directly. Functions no longer use a
magic linkage to record that they're materializable; they simply ask the
GVMaterializer.

Because the C ABI must never change, we can't remove LLVMModuleProviderRef or
the functions that refer to it. Instead, because Module now exposes the same
functionality ModuleProvider used to, we store a Module* in any
LLVMModuleProviderRef and translate in the wrapper methods.  The bindings to
other languages still use the ModuleProvider concept.  It would probably be
worth some time to update them to follow the C++ more closely, but I don't
intend to do it.

Fixes http://llvm.org/PR5737 and http://llvm.org/PR5735.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94686 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-27 20:34:15 +00:00

432 lines
13 KiB
C++

//===- Pass.cpp - LLVM Pass Infrastructure 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 LLVM Pass infrastructure. It is primarily
// responsible with ensuring that passes are executed and batched together
// optimally.
//
//===----------------------------------------------------------------------===//
#include "llvm/Pass.h"
#include "llvm/PassManager.h"
#include "llvm/Module.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/PassNameParser.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/System/Atomic.h"
#include "llvm/System/Mutex.h"
#include "llvm/System/Threading.h"
#include <algorithm>
#include <map>
#include <set>
using namespace llvm;
//===----------------------------------------------------------------------===//
// Pass Implementation
//
// Force out-of-line virtual method.
Pass::~Pass() {
delete Resolver;
}
// Force out-of-line virtual method.
ModulePass::~ModulePass() { }
PassManagerType ModulePass::getPotentialPassManagerType() const {
return PMT_ModulePassManager;
}
bool Pass::mustPreserveAnalysisID(const PassInfo *AnalysisID) const {
return Resolver->getAnalysisIfAvailable(AnalysisID, true) != 0;
}
// dumpPassStructure - Implement the -debug-passes=Structure option
void Pass::dumpPassStructure(unsigned Offset) {
dbgs().indent(Offset*2) << getPassName() << "\n";
}
/// getPassName - Return a nice clean name for a pass. This usually
/// implemented in terms of the name that is registered by one of the
/// Registration templates, but can be overloaded directly.
///
const char *Pass::getPassName() const {
if (const PassInfo *PI = getPassInfo())
return PI->getPassName();
return "Unnamed pass: implement Pass::getPassName()";
}
void Pass::preparePassManager(PMStack &) {
// By default, don't do anything.
}
PassManagerType Pass::getPotentialPassManagerType() const {
// Default implementation.
return PMT_Unknown;
}
void Pass::getAnalysisUsage(AnalysisUsage &) const {
// By default, no analysis results are used, all are invalidated.
}
void Pass::releaseMemory() {
// By default, don't do anything.
}
void Pass::verifyAnalysis() const {
// By default, don't do anything.
}
// print - Print out the internal state of the pass. This is called by Analyze
// to print out the contents of an analysis. Otherwise it is not necessary to
// implement this method.
//
void Pass::print(raw_ostream &O,const Module*) const {
O << "Pass::print not implemented for pass: '" << getPassName() << "'!\n";
}
// dump - call print(cerr);
void Pass::dump() const {
print(dbgs(), 0);
}
//===----------------------------------------------------------------------===//
// ImmutablePass Implementation
//
// Force out-of-line virtual method.
ImmutablePass::~ImmutablePass() { }
void ImmutablePass::initializePass() {
// By default, don't do anything.
}
//===----------------------------------------------------------------------===//
// FunctionPass Implementation
//
// run - On a module, we run this pass by initializing, runOnFunction'ing once
// for every function in the module, then by finalizing.
//
bool FunctionPass::runOnModule(Module &M) {
bool Changed = doInitialization(M);
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
if (!I->isDeclaration()) // Passes are not run on external functions!
Changed |= runOnFunction(*I);
return Changed | doFinalization(M);
}
// run - On a function, we simply initialize, run the function, then finalize.
//
bool FunctionPass::run(Function &F) {
// Passes are not run on external functions!
if (F.isDeclaration()) return false;
bool Changed = doInitialization(*F.getParent());
Changed |= runOnFunction(F);
return Changed | doFinalization(*F.getParent());
}
bool FunctionPass::doInitialization(Module &) {
// By default, don't do anything.
return false;
}
bool FunctionPass::doFinalization(Module &) {
// By default, don't do anything.
return false;
}
PassManagerType FunctionPass::getPotentialPassManagerType() const {
return PMT_FunctionPassManager;
}
//===----------------------------------------------------------------------===//
// BasicBlockPass Implementation
//
// To run this pass on a function, we simply call runOnBasicBlock once for each
// function.
//
bool BasicBlockPass::runOnFunction(Function &F) {
bool Changed = doInitialization(F);
for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I)
Changed |= runOnBasicBlock(*I);
return Changed | doFinalization(F);
}
bool BasicBlockPass::doInitialization(Module &) {
// By default, don't do anything.
return false;
}
bool BasicBlockPass::doInitialization(Function &) {
// By default, don't do anything.
return false;
}
bool BasicBlockPass::doFinalization(Function &) {
// By default, don't do anything.
return false;
}
bool BasicBlockPass::doFinalization(Module &) {
// By default, don't do anything.
return false;
}
PassManagerType BasicBlockPass::getPotentialPassManagerType() const {
return PMT_BasicBlockPassManager;
}
//===----------------------------------------------------------------------===//
// Pass Registration mechanism
//
namespace {
class PassRegistrar {
/// PassInfoMap - Keep track of the passinfo object for each registered llvm
/// pass.
typedef std::map<intptr_t, const PassInfo*> MapType;
MapType PassInfoMap;
typedef StringMap<const PassInfo*> StringMapType;
StringMapType PassInfoStringMap;
/// AnalysisGroupInfo - Keep track of information for each analysis group.
struct AnalysisGroupInfo {
std::set<const PassInfo *> Implementations;
};
/// AnalysisGroupInfoMap - Information for each analysis group.
std::map<const PassInfo *, AnalysisGroupInfo> AnalysisGroupInfoMap;
public:
const PassInfo *GetPassInfo(intptr_t TI) const {
MapType::const_iterator I = PassInfoMap.find(TI);
return I != PassInfoMap.end() ? I->second : 0;
}
const PassInfo *GetPassInfo(StringRef Arg) const {
StringMapType::const_iterator I = PassInfoStringMap.find(Arg);
return I != PassInfoStringMap.end() ? I->second : 0;
}
void RegisterPass(const PassInfo &PI) {
bool Inserted =
PassInfoMap.insert(std::make_pair(PI.getTypeInfo(),&PI)).second;
assert(Inserted && "Pass registered multiple times!"); Inserted=Inserted;
PassInfoStringMap[PI.getPassArgument()] = &PI;
}
void UnregisterPass(const PassInfo &PI) {
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 EnumerateWith(PassRegistrationListener *L) {
for (MapType::const_iterator I = PassInfoMap.begin(),
E = PassInfoMap.end(); I != E; ++I)
L->passEnumerate(I->second);
}
/// Analysis Group Mechanisms.
void RegisterAnalysisGroup(PassInfo *InterfaceInfo,
const PassInfo *ImplementationInfo,
bool isDefault) {
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());
}
}
};
}
static std::vector<PassRegistrationListener*> *Listeners = 0;
static sys::SmartMutex<true> ListenersLock;
// FIXME: This should use ManagedStatic to manage the pass registrar.
// Unfortunately, we can't do this, because passes are registered with static
// ctors, and having llvm_shutdown clear this map prevents successful
// ressurection after llvm_shutdown is run.
static PassRegistrar *getPassRegistrar() {
static PassRegistrar *PassRegistrarObj = 0;
// Use double-checked locking to safely initialize the registrar when
// we're running in multithreaded mode.
PassRegistrar* tmp = PassRegistrarObj;
if (llvm_is_multithreaded()) {
sys::MemoryFence();
if (!tmp) {
llvm_acquire_global_lock();
tmp = PassRegistrarObj;
if (!tmp) {
tmp = new PassRegistrar();
sys::MemoryFence();
PassRegistrarObj = tmp;
}
llvm_release_global_lock();
}
} else if (!tmp) {
PassRegistrarObj = new PassRegistrar();
}
return PassRegistrarObj;
}
// getPassInfo - Return the PassInfo data structure that corresponds to this
// pass...
const PassInfo *Pass::getPassInfo() const {
return lookupPassInfo(PassID);
}
const PassInfo *Pass::lookupPassInfo(intptr_t TI) {
return getPassRegistrar()->GetPassInfo(TI);
}
const PassInfo *Pass::lookupPassInfo(StringRef Arg) {
return getPassRegistrar()->GetPassInfo(Arg);
}
void PassInfo::registerPass() {
getPassRegistrar()->RegisterPass(*this);
// Notify any listeners.
sys::SmartScopedLock<true> Lock(ListenersLock);
if (Listeners)
for (std::vector<PassRegistrationListener*>::iterator
I = Listeners->begin(), E = Listeners->end(); I != E; ++I)
(*I)->passRegistered(this);
}
void PassInfo::unregisterPass() {
getPassRegistrar()->UnregisterPass(*this);
}
//===----------------------------------------------------------------------===//
// Analysis Group Implementation Code
//===----------------------------------------------------------------------===//
// RegisterAGBase implementation
//
RegisterAGBase::RegisterAGBase(const char *Name, intptr_t InterfaceID,
intptr_t PassID, bool isDefault)
: PassInfo(Name, InterfaceID) {
PassInfo *InterfaceInfo =
const_cast<PassInfo*>(Pass::lookupPassInfo(InterfaceID));
if (InterfaceInfo == 0) {
// First reference to Interface, register it now.
registerPass();
InterfaceInfo = this;
}
assert(isAnalysisGroup() &&
"Trying to join an analysis group that is a normal pass!");
if (PassID) {
const PassInfo *ImplementationInfo = Pass::lookupPassInfo(PassID);
assert(ImplementationInfo &&
"Must register pass before adding to AnalysisGroup!");
// Make sure we keep track of the fact that the implementation implements
// the interface.
PassInfo *IIPI = const_cast<PassInfo*>(ImplementationInfo);
IIPI->addInterfaceImplemented(InterfaceInfo);
getPassRegistrar()->RegisterAnalysisGroup(InterfaceInfo, IIPI, isDefault);
}
}
//===----------------------------------------------------------------------===//
// PassRegistrationListener implementation
//
// PassRegistrationListener ctor - Add the current object to the list of
// PassRegistrationListeners...
PassRegistrationListener::PassRegistrationListener() {
sys::SmartScopedLock<true> Lock(ListenersLock);
if (!Listeners) Listeners = new std::vector<PassRegistrationListener*>();
Listeners->push_back(this);
}
// dtor - Remove object from list of listeners...
PassRegistrationListener::~PassRegistrationListener() {
sys::SmartScopedLock<true> Lock(ListenersLock);
std::vector<PassRegistrationListener*>::iterator I =
std::find(Listeners->begin(), Listeners->end(), this);
assert(Listeners && I != Listeners->end() &&
"PassRegistrationListener not registered!");
Listeners->erase(I);
if (Listeners->empty()) {
delete Listeners;
Listeners = 0;
}
}
// enumeratePasses - Iterate over the registered passes, calling the
// passEnumerate callback on each PassInfo object.
//
void PassRegistrationListener::enumeratePasses() {
getPassRegistrar()->EnumerateWith(this);
}
PassNameParser::~PassNameParser() {}
//===----------------------------------------------------------------------===//
// AnalysisUsage Class Implementation
//
namespace {
struct GetCFGOnlyPasses : public PassRegistrationListener {
typedef AnalysisUsage::VectorType VectorType;
VectorType &CFGOnlyList;
GetCFGOnlyPasses(VectorType &L) : CFGOnlyList(L) {}
void passEnumerate(const PassInfo *P) {
if (P->isCFGOnlyPass())
CFGOnlyList.push_back(P);
}
};
}
// setPreservesCFG - This function should be called to by the pass, iff they do
// not:
//
// 1. Add or remove basic blocks from the function
// 2. Modify terminator instructions in any way.
//
// This function annotates the AnalysisUsage info object to say that analyses
// that only depend on the CFG are preserved by this pass.
//
void AnalysisUsage::setPreservesCFG() {
// Since this transformation doesn't modify the CFG, it preserves all analyses
// that only depend on the CFG (like dominators, loop info, etc...)
GetCFGOnlyPasses(Preserved).enumeratePasses();
}