mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 11:42:57 +01:00
457dd0b6c7
a pointer from an AliasSet, maintain the pointer values on a doubly linked list instead of a singly linked list, to permit efficient removal from the middle of the list. llvm-svn: 10506
365 lines
12 KiB
C++
365 lines
12 KiB
C++
//===- AliasSetTracker.cpp - Alias Sets Tracker implementation-------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the AliasSetTracker and AliasSet classes.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Analysis/AliasSetTracker.h"
|
|
#include "llvm/Analysis/AliasAnalysis.h"
|
|
#include "llvm/iMemory.h"
|
|
#include "llvm/iOther.h"
|
|
#include "llvm/iTerminators.h"
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/Target/TargetData.h"
|
|
#include "llvm/Assembly/Writer.h"
|
|
#include "llvm/Support/InstIterator.h"
|
|
using namespace llvm;
|
|
|
|
/// mergeSetIn - Merge the specified alias set into this alias set...
|
|
///
|
|
void AliasSet::mergeSetIn(AliasSet &AS) {
|
|
assert(!AS.Forward && "Alias set is already forwarding!");
|
|
assert(!Forward && "This set is a forwarding set!!");
|
|
|
|
// Update the alias and access types of this set...
|
|
AccessTy |= AS.AccessTy;
|
|
AliasTy |= AS.AliasTy;
|
|
|
|
if (CallSites.empty()) { // Merge call sites...
|
|
if (!AS.CallSites.empty())
|
|
std::swap(CallSites, AS.CallSites);
|
|
} else if (!AS.CallSites.empty()) {
|
|
CallSites.insert(CallSites.end(), AS.CallSites.begin(), AS.CallSites.end());
|
|
AS.CallSites.clear();
|
|
}
|
|
|
|
// FIXME: If AS's refcount is zero, nuke it now...
|
|
assert(RefCount != 0);
|
|
|
|
AS.Forward = this; // Forward across AS now...
|
|
RefCount++; // AS is now pointing to us...
|
|
|
|
// Merge the list of constituent pointers...
|
|
if (AS.PtrList) {
|
|
*PtrListEnd = AS.PtrList;
|
|
AS.PtrList->second.setPrevInList(PtrListEnd);
|
|
PtrListEnd = AS.PtrListEnd;
|
|
|
|
AS.PtrList = 0;
|
|
AS.PtrListEnd = &AS.PtrList;
|
|
}
|
|
}
|
|
|
|
void AliasSetTracker::removeAliasSet(AliasSet *AS) {
|
|
AliasSets.erase(AS);
|
|
}
|
|
|
|
void AliasSet::removeFromTracker(AliasSetTracker &AST) {
|
|
assert(RefCount == 0 && "Cannot remove non-dead alias set from tracker!");
|
|
AST.removeAliasSet(this);
|
|
}
|
|
|
|
void AliasSet::addPointer(AliasSetTracker &AST, HashNodePair &Entry,
|
|
unsigned Size) {
|
|
assert(!Entry.second.hasAliasSet() && "Entry already in set!");
|
|
|
|
AliasAnalysis &AA = AST.getAliasAnalysis();
|
|
|
|
if (isMustAlias()) // Check to see if we have to downgrade to _may_ alias
|
|
if (HashNodePair *P = getSomePointer()) {
|
|
AliasAnalysis::AliasResult Result =
|
|
AA.alias(P->first, P->second.getSize(), Entry.first, Size);
|
|
if (Result == AliasAnalysis::MayAlias)
|
|
AliasTy = MayAlias;
|
|
else // First entry of must alias must have maximum size!
|
|
P->second.updateSize(Size);
|
|
assert(Result != AliasAnalysis::NoAlias && "Cannot be part of must set!");
|
|
}
|
|
|
|
Entry.second.setAliasSet(this);
|
|
Entry.second.updateSize(Size);
|
|
|
|
// Add it to the end of the list...
|
|
assert(*PtrListEnd == 0 && "End of list is not null?");
|
|
*PtrListEnd = &Entry;
|
|
PtrListEnd = Entry.second.setPrevInList(PtrListEnd);
|
|
RefCount++; // Entry points to alias set...
|
|
}
|
|
|
|
void AliasSet::addCallSite(CallSite CS) {
|
|
CallSites.push_back(CS);
|
|
AliasTy = MayAlias; // FIXME: Too conservative?
|
|
AccessTy = ModRef;
|
|
}
|
|
|
|
/// aliasesPointer - Return true if the specified pointer "may" (or must)
|
|
/// alias one of the members in the set.
|
|
///
|
|
bool AliasSet::aliasesPointer(const Value *Ptr, unsigned Size,
|
|
AliasAnalysis &AA) const {
|
|
if (AliasTy == MustAlias) {
|
|
assert(CallSites.empty() && "Illegal must alias set!");
|
|
|
|
// If this is a set of MustAliases, only check to see if the pointer aliases
|
|
// SOME value in the set...
|
|
HashNodePair *SomePtr = getSomePointer();
|
|
assert(SomePtr && "Empty must-alias set??");
|
|
return AA.alias(SomePtr->first, SomePtr->second.getSize(), Ptr, Size);
|
|
}
|
|
|
|
// If this is a may-alias set, we have to check all of the pointers in the set
|
|
// to be sure it doesn't alias the set...
|
|
for (iterator I = begin(), E = end(); I != E; ++I)
|
|
if (AA.alias(Ptr, Size, I->first, I->second.getSize()))
|
|
return true;
|
|
|
|
// Check the call sites list and invoke list...
|
|
if (!CallSites.empty())
|
|
// FIXME: this is pessimistic!
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
bool AliasSet::aliasesCallSite(CallSite CS, AliasAnalysis &AA) const {
|
|
// FIXME: Too conservative!
|
|
return true;
|
|
}
|
|
|
|
|
|
/// findAliasSetForPointer - Given a pointer, find the one alias set to put the
|
|
/// instruction referring to the pointer into. If there are multiple alias sets
|
|
/// that may alias the pointer, merge them together and return the unified set.
|
|
///
|
|
AliasSet *AliasSetTracker::findAliasSetForPointer(const Value *Ptr,
|
|
unsigned Size) {
|
|
AliasSet *FoundSet = 0;
|
|
for (iterator I = begin(), E = end(); I != E; ++I)
|
|
if (!I->Forward && I->aliasesPointer(Ptr, Size, AA)) {
|
|
if (FoundSet == 0) { // If this is the first alias set ptr can go into...
|
|
FoundSet = I; // Remember it.
|
|
} else { // Otherwise, we must merge the sets...
|
|
FoundSet->mergeSetIn(*I); // Merge in contents...
|
|
}
|
|
}
|
|
|
|
return FoundSet;
|
|
}
|
|
|
|
AliasSet *AliasSetTracker::findAliasSetForCallSite(CallSite CS) {
|
|
AliasSet *FoundSet = 0;
|
|
for (iterator I = begin(), E = end(); I != E; ++I)
|
|
if (!I->Forward && I->aliasesCallSite(CS, AA)) {
|
|
if (FoundSet == 0) { // If this is the first alias set ptr can go into...
|
|
FoundSet = I; // Remember it.
|
|
} else if (!I->Forward) { // Otherwise, we must merge the sets...
|
|
FoundSet->mergeSetIn(*I); // Merge in contents...
|
|
}
|
|
}
|
|
|
|
return FoundSet;
|
|
}
|
|
|
|
|
|
|
|
|
|
/// getAliasSetForPointer - Return the alias set that the specified pointer
|
|
/// lives in...
|
|
AliasSet &AliasSetTracker::getAliasSetForPointer(Value *Pointer, unsigned Size){
|
|
AliasSet::HashNodePair &Entry = getEntryFor(Pointer);
|
|
|
|
// Check to see if the pointer is already known...
|
|
if (Entry.second.hasAliasSet() && Size <= Entry.second.getSize()) {
|
|
// Return the set!
|
|
return *Entry.second.getAliasSet(*this)->getForwardedTarget(*this);
|
|
} else if (AliasSet *AS = findAliasSetForPointer(Pointer, Size)) {
|
|
// Add it to the alias set it aliases...
|
|
AS->addPointer(*this, Entry, Size);
|
|
return *AS;
|
|
} else {
|
|
// Otherwise create a new alias set to hold the loaded pointer...
|
|
AliasSets.push_back(AliasSet());
|
|
AliasSets.back().addPointer(*this, Entry, Size);
|
|
return AliasSets.back();
|
|
}
|
|
}
|
|
|
|
void AliasSetTracker::add(LoadInst *LI) {
|
|
AliasSet &AS =
|
|
addPointer(LI->getOperand(0),
|
|
AA.getTargetData().getTypeSize(LI->getType()), AliasSet::Refs);
|
|
if (LI->isVolatile()) AS.setVolatile();
|
|
}
|
|
|
|
void AliasSetTracker::add(StoreInst *SI) {
|
|
AliasSet &AS =
|
|
addPointer(SI->getOperand(1),
|
|
AA.getTargetData().getTypeSize(SI->getOperand(0)->getType()),
|
|
AliasSet::Mods);
|
|
if (SI->isVolatile()) AS.setVolatile();
|
|
}
|
|
|
|
|
|
void AliasSetTracker::add(CallSite CS) {
|
|
AliasSet *AS = findAliasSetForCallSite(CS);
|
|
if (!AS) {
|
|
AliasSets.push_back(AliasSet());
|
|
AS = &AliasSets.back();
|
|
}
|
|
AS->addCallSite(CS);
|
|
}
|
|
|
|
void AliasSetTracker::add(Instruction *I) {
|
|
// Dispatch to one of the other add methods...
|
|
if (LoadInst *LI = dyn_cast<LoadInst>(I))
|
|
add(LI);
|
|
else if (StoreInst *SI = dyn_cast<StoreInst>(I))
|
|
add(SI);
|
|
else if (CallInst *CI = dyn_cast<CallInst>(I))
|
|
add(CI);
|
|
else if (InvokeInst *II = dyn_cast<InvokeInst>(I))
|
|
add(II);
|
|
}
|
|
|
|
void AliasSetTracker::add(BasicBlock &BB) {
|
|
for (BasicBlock::iterator I = BB.begin(), E = BB.end(); I != E; ++I)
|
|
add(I);
|
|
}
|
|
|
|
void AliasSetTracker::add(const AliasSetTracker &AST) {
|
|
assert(&AA == &AST.AA &&
|
|
"Merging AliasSetTracker objects with different Alias Analyses!");
|
|
|
|
// Loop over all of the alias sets in AST, adding the pointers contained
|
|
// therein into the current alias sets. This can cause alias sets to be
|
|
// merged together in the current AST.
|
|
for (const_iterator I = AST.begin(), E = AST.end(); I != E; ++I)
|
|
if (!I->Forward) { // Ignore forwarding alias sets
|
|
AliasSet &AS = const_cast<AliasSet&>(*I);
|
|
|
|
// If there are any call sites in the alias set, add them to this AST.
|
|
for (unsigned i = 0, e = AS.CallSites.size(); i != e; ++i)
|
|
add(AS.CallSites[i]);
|
|
|
|
// Loop over all of the pointers in this alias set...
|
|
AliasSet::iterator I = AS.begin(), E = AS.end();
|
|
for (; I != E; ++I)
|
|
addPointer(I->first, I->second.getSize(),
|
|
(AliasSet::AccessType)AS.AccessTy);
|
|
}
|
|
}
|
|
|
|
|
|
// remove method - This method is used to remove a pointer value from the
|
|
// AliasSetTracker entirely. It should be used when an instruction is deleted
|
|
// from the program to update the AST. If you don't use this, you would have
|
|
// dangling pointers to deleted instructions.
|
|
//
|
|
void AliasSetTracker::remove(Value *PtrVal) {
|
|
// First, look up the PointerRec for this pointer...
|
|
hash_map<Value*, AliasSet::PointerRec>::iterator I = PointerMap.find(PtrVal);
|
|
if (I == PointerMap.end()) return; // Noop
|
|
|
|
// If we found one, remove the pointer from the alias set it is in.
|
|
AliasSet::HashNodePair &PtrValEnt = *I;
|
|
AliasSet *AS = PtrValEnt.second.getAliasSet(*this);
|
|
|
|
// Unlink from the list of values...
|
|
PtrValEnt.second.removeFromList();
|
|
// Stop using the alias set
|
|
if (--AS->RefCount == 0)
|
|
AS->removeFromTracker(*this);
|
|
|
|
PointerMap.erase(I);
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// AliasSet/AliasSetTracker Printing Support
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
void AliasSet::print(std::ostream &OS) const {
|
|
OS << " AliasSet[" << (void*)this << "," << RefCount << "] ";
|
|
OS << (AliasTy == MustAlias ? "must" : "may ") << " alias, ";
|
|
switch (AccessTy) {
|
|
case NoModRef: OS << "No access "; break;
|
|
case Refs : OS << "Ref "; break;
|
|
case Mods : OS << "Mod "; break;
|
|
case ModRef : OS << "Mod/Ref "; break;
|
|
default: assert(0 && "Bad value for AccessTy!");
|
|
}
|
|
if (isVolatile()) OS << "[volatile] ";
|
|
if (Forward)
|
|
OS << " forwarding to " << (void*)Forward;
|
|
|
|
|
|
if (begin() != end()) {
|
|
OS << "Pointers: ";
|
|
for (iterator I = begin(), E = end(); I != E; ++I) {
|
|
if (I != begin()) OS << ", ";
|
|
WriteAsOperand(OS << "(", I->first);
|
|
OS << ", " << I->second.getSize() << ")";
|
|
}
|
|
}
|
|
if (!CallSites.empty()) {
|
|
OS << "\n " << CallSites.size() << " Call Sites: ";
|
|
for (unsigned i = 0, e = CallSites.size(); i != e; ++i) {
|
|
if (i) OS << ", ";
|
|
WriteAsOperand(OS, CallSites[i].getCalledValue());
|
|
}
|
|
}
|
|
OS << "\n";
|
|
}
|
|
|
|
void AliasSetTracker::print(std::ostream &OS) const {
|
|
OS << "Alias Set Tracker: " << AliasSets.size() << " alias sets for "
|
|
<< PointerMap.size() << " pointer values.\n";
|
|
for (const_iterator I = begin(), E = end(); I != E; ++I)
|
|
I->print(OS);
|
|
OS << "\n";
|
|
}
|
|
|
|
void AliasSet::dump() const { print (std::cerr); }
|
|
void AliasSetTracker::dump() const { print(std::cerr); }
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// AliasSetPrinter Pass
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
namespace {
|
|
class AliasSetPrinter : public FunctionPass {
|
|
AliasSetTracker *Tracker;
|
|
public:
|
|
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.setPreservesAll();
|
|
AU.addRequired<AliasAnalysis>();
|
|
}
|
|
|
|
virtual bool runOnFunction(Function &F) {
|
|
Tracker = new AliasSetTracker(getAnalysis<AliasAnalysis>());
|
|
|
|
for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I)
|
|
Tracker->add(*I);
|
|
return false;
|
|
}
|
|
|
|
/// print - Convert to human readable form
|
|
virtual void print(std::ostream &OS) const {
|
|
Tracker->print(OS);
|
|
}
|
|
|
|
virtual void releaseMemory() {
|
|
delete Tracker;
|
|
}
|
|
};
|
|
RegisterPass<AliasSetPrinter> X("print-alias-sets", "Alias Set Printer",
|
|
PassInfo::Analysis | PassInfo::Optimization);
|
|
}
|