llvm-6502/lib/Analysis/AliasSetTracker.cpp
Nick Lewycky e81f725b3a Explain change with a comment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30443 91177308-0d34-0410-b5e6-96231b3b80d8
2006-09-17 17:51:00 +00:00

574 lines
18 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/Instructions.h"
#include "llvm/Pass.h"
#include "llvm/Type.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/Support/InstIterator.h"
#include <iostream>
using namespace llvm;
/// mergeSetIn - Merge the specified alias set into this alias set.
///
void AliasSet::mergeSetIn(AliasSet &AS, AliasSetTracker &AST) {
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 (AliasTy == MustAlias) {
// Check that these two merged sets really are must aliases. Since both
// used to be must-alias sets, we can just check any pointer from each set
// for aliasing.
AliasAnalysis &AA = AST.getAliasAnalysis();
HashNodePair *L = getSomePointer();
HashNodePair *R = AS.getSomePointer();
// If the pointers are not a must-alias pair, this set becomes a may alias.
if (AA.alias(L->first, L->second.getSize(), R->first, R->second.getSize())
!= AliasAnalysis::MustAlias)
AliasTy = MayAlias;
}
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();
}
AS.Forward = this; // Forward across AS now...
addRef(); // 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;
assert(*AS.PtrListEnd == 0 && "End of list is not null?");
}
}
void AliasSetTracker::removeAliasSet(AliasSet *AS) {
if (AliasSet *Fwd = AS->Forward) {
Fwd->dropRef(*this);
AS->Forward = 0;
}
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, bool KnownMustAlias) {
assert(!Entry.second.hasAliasSet() && "Entry already in set!");
// Check to see if we have to downgrade to _may_ alias.
if (isMustAlias() && !KnownMustAlias)
if (HashNodePair *P = getSomePointer()) {
AliasAnalysis &AA = AST.getAliasAnalysis();
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);
assert(*PtrListEnd == 0 && "End of list is not null?");
addRef(); // Entry points to alias set...
}
void AliasSet::addCallSite(CallSite CS, AliasAnalysis &AA) {
CallSites.push_back(CS);
if (Function *F = CS.getCalledFunction()) {
AliasAnalysis::ModRefBehavior Behavior = AA.getModRefBehavior(F, CS);
if (Behavior == AliasAnalysis::DoesNotAccessMemory)
return;
else if (Behavior == AliasAnalysis::OnlyReadsMemory) {
AliasTy = MayAlias;
AccessTy |= Refs;
return;
}
}
// FIXME: This should use mod/ref information to make this not suck so bad
AliasTy = MayAlias;
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.getPointer(), I.getSize()))
return true;
// Check the call sites list and invoke list...
if (!CallSites.empty()) {
if (AA.hasNoModRefInfoForCalls())
return true;
for (unsigned i = 0, e = CallSites.size(); i != e; ++i)
if (AA.getModRefInfo(CallSites[i], const_cast<Value*>(Ptr), Size)
!= AliasAnalysis::NoModRef)
return true;
}
return false;
}
bool AliasSet::aliasesCallSite(CallSite CS, AliasAnalysis &AA) const {
if (Function *F = CS.getCalledFunction())
if (AA.doesNotAccessMemory(F))
return false;
if (AA.hasNoModRefInfoForCalls())
return true;
for (unsigned i = 0, e = CallSites.size(); i != e; ++i)
if (AA.getModRefInfo(CallSites[i], CS) != AliasAnalysis::NoModRef ||
AA.getModRefInfo(CS, CallSites[i]) != AliasAnalysis::NoModRef)
return true;
for (iterator I = begin(), E = end(); I != E; ++I)
if (AA.getModRefInfo(CS, I.getPointer(), I.getSize()) !=
AliasAnalysis::NoModRef)
return true;
return false;
}
/// 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, *this); // Merge in contents.
}
}
return FoundSet;
}
/// containsPointer - Return true if the specified location is represented by
/// this alias set, false otherwise. This does not modify the AST object or
/// alias sets.
bool AliasSetTracker::containsPointer(Value *Ptr, unsigned Size) const {
for (const_iterator I = begin(), E = end(); I != E; ++I)
if (!I->Forward && I->aliasesPointer(Ptr, Size, AA))
return true;
return false;
}
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, *this); // Merge in contents.
}
}
return FoundSet;
}
/// getAliasSetForPointer - Return the alias set that the specified pointer
/// lives in...
AliasSet &AliasSetTracker::getAliasSetForPointer(Value *Pointer, unsigned Size,
bool *New) {
AliasSet::HashNodePair &Entry = getEntryFor(Pointer);
// Check to see if the pointer is already known...
if (Entry.second.hasAliasSet()) {
Entry.second.updateSize(Size);
// 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 {
if (New) *New = true;
// Otherwise create a new alias set to hold the loaded pointer...
AliasSets.push_back(new AliasSet());
AliasSets.back().addPointer(*this, Entry, Size);
return AliasSets.back();
}
}
bool AliasSetTracker::add(Value *Ptr, unsigned Size) {
bool NewPtr;
addPointer(Ptr, Size, AliasSet::NoModRef, NewPtr);
return NewPtr;
}
bool AliasSetTracker::add(LoadInst *LI) {
bool NewPtr;
AliasSet &AS = addPointer(LI->getOperand(0),
AA.getTargetData().getTypeSize(LI->getType()),
AliasSet::Refs, NewPtr);
if (LI->isVolatile()) AS.setVolatile();
return NewPtr;
}
bool AliasSetTracker::add(StoreInst *SI) {
bool NewPtr;
Value *Val = SI->getOperand(0);
AliasSet &AS = addPointer(SI->getOperand(1),
AA.getTargetData().getTypeSize(Val->getType()),
AliasSet::Mods, NewPtr);
if (SI->isVolatile()) AS.setVolatile();
return NewPtr;
}
bool AliasSetTracker::add(FreeInst *FI) {
bool NewPtr;
AliasSet &AS = addPointer(FI->getOperand(0), ~0,
AliasSet::Mods, NewPtr);
// Free operations are volatile ops (cannot be moved).
AS.setVolatile();
return NewPtr;
}
bool AliasSetTracker::add(CallSite CS) {
if (Function *F = CS.getCalledFunction())
if (AA.doesNotAccessMemory(F))
return true; // doesn't alias anything
AliasSet *AS = findAliasSetForCallSite(CS);
if (!AS) {
AliasSets.push_back(new AliasSet());
AS = &AliasSets.back();
AS->addCallSite(CS, AA);
return true;
} else {
AS->addCallSite(CS, AA);
return false;
}
}
bool AliasSetTracker::add(Instruction *I) {
// Dispatch to one of the other add methods...
if (LoadInst *LI = dyn_cast<LoadInst>(I))
return add(LI);
else if (StoreInst *SI = dyn_cast<StoreInst>(I))
return add(SI);
else if (CallInst *CI = dyn_cast<CallInst>(I))
return add(CI);
else if (InvokeInst *II = dyn_cast<InvokeInst>(I))
return add(II);
else if (FreeInst *FI = dyn_cast<FreeInst>(I))
return add(FI);
return true;
}
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();
bool X;
for (; I != E; ++I)
addPointer(I.getPointer(), I.getSize(),
(AliasSet::AccessType)AS.AccessTy, X);
}
}
/// remove - Remove the specified (potentially non-empty) alias set from the
/// tracker.
void AliasSetTracker::remove(AliasSet &AS) {
// Drop all call sites.
AS.CallSites.clear();
// Clear the alias set.
unsigned NumRefs = 0;
while (!AS.empty()) {
AliasSet::HashNodePair *P = AS.PtrList;
// Unlink from the list of values.
P->second.removeFromList();
// Remember how many references need to be dropped.
++NumRefs;
// Finally, remove the entry.
Value *Remove = P->first; // Take a copy because it is invalid to pass
PointerMap.erase(Remove); // a reference to the data being erased.
}
// Stop using the alias set, removing it.
AS.RefCount -= NumRefs;
if (AS.RefCount == 0)
AS.removeFromTracker(*this);
}
bool AliasSetTracker::remove(Value *Ptr, unsigned Size) {
AliasSet *AS = findAliasSetForPointer(Ptr, Size);
if (!AS) return false;
remove(*AS);
return true;
}
bool AliasSetTracker::remove(LoadInst *LI) {
unsigned Size = AA.getTargetData().getTypeSize(LI->getType());
AliasSet *AS = findAliasSetForPointer(LI->getOperand(0), Size);
if (!AS) return false;
remove(*AS);
return true;
}
bool AliasSetTracker::remove(StoreInst *SI) {
unsigned Size = AA.getTargetData().getTypeSize(SI->getOperand(0)->getType());
AliasSet *AS = findAliasSetForPointer(SI->getOperand(1), Size);
if (!AS) return false;
remove(*AS);
return true;
}
bool AliasSetTracker::remove(FreeInst *FI) {
AliasSet *AS = findAliasSetForPointer(FI->getOperand(0), ~0);
if (!AS) return false;
remove(*AS);
return true;
}
bool AliasSetTracker::remove(CallSite CS) {
if (Function *F = CS.getCalledFunction())
if (AA.doesNotAccessMemory(F))
return false; // doesn't alias anything
AliasSet *AS = findAliasSetForCallSite(CS);
if (!AS) return false;
remove(*AS);
return true;
}
bool AliasSetTracker::remove(Instruction *I) {
// Dispatch to one of the other remove methods...
if (LoadInst *LI = dyn_cast<LoadInst>(I))
return remove(LI);
else if (StoreInst *SI = dyn_cast<StoreInst>(I))
return remove(SI);
else if (CallInst *CI = dyn_cast<CallInst>(I))
return remove(CI);
else if (FreeInst *FI = dyn_cast<FreeInst>(I))
return remove(FI);
return true;
}
// deleteValue 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::deleteValue(Value *PtrVal) {
// Notify the alias analysis implementation that this value is gone.
AA.deleteValue(PtrVal);
// If this is a call instruction, remove the callsite from the appropriate
// AliasSet.
CallSite CS = CallSite::get(PtrVal);
if (CS.getInstruction()) {
Function *F = CS.getCalledFunction();
if (!F || !AA.doesNotAccessMemory(F)) {
if (AliasSet *AS = findAliasSetForCallSite(CS))
AS->removeCallSite(CS);
}
}
// 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
AS->dropRef(*this);
PointerMap.erase(I);
}
// copyValue - This method should be used whenever a preexisting value in the
// program is copied or cloned, introducing a new value. Note that it is ok for
// clients that use this method to introduce the same value multiple times: if
// the tracker already knows about a value, it will ignore the request.
//
void AliasSetTracker::copyValue(Value *From, Value *To) {
// Notify the alias analysis implementation that this value is copied.
AA.copyValue(From, To);
// First, look up the PointerRec for this pointer.
hash_map<Value*, AliasSet::PointerRec>::iterator I = PointerMap.find(From);
if (I == PointerMap.end() || !I->second.hasAliasSet())
return; // Noop
AliasSet::HashNodePair &Entry = getEntryFor(To);
if (Entry.second.hasAliasSet()) return; // Already in the tracker!
// Add it to the alias set it aliases...
AliasSet *AS = I->second.getAliasSet(*this);
AS->addPointer(*this, Entry, I->second.getSize(), true);
}
//===----------------------------------------------------------------------===//
// 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.getPointer());
OS << ", " << I.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);
Tracker->print(std::cerr);
delete Tracker;
return false;
}
};
RegisterPass<AliasSetPrinter> X("print-alias-sets", "Alias Set Printer");
}