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llvm-mirror/lib/Analysis/AliasSetTracker.cpp
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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//===- AliasSetTracker.cpp - Alias Sets Tracker 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 AliasSetTracker and AliasSet classes.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/AliasSetTracker.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/GuardUtils.h"
#include "llvm/Analysis/MemoryLocation.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/PatternMatch.h"
#include "llvm/IR/Value.h"
#include "llvm/Pass.h"
#include "llvm/Support/AtomicOrdering.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <cstdint>
#include <vector>
using namespace llvm;
static cl::opt<unsigned>
SaturationThreshold("alias-set-saturation-threshold", cl::Hidden,
cl::init(250),
cl::desc("The maximum number of pointers may-alias "
"sets may contain before degradation"));
/// 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!!");
bool WasMustAlias = (Alias == SetMustAlias);
// Update the alias and access types of this set...
Access |= AS.Access;
Alias |= AS.Alias;
if (Alias == SetMustAlias) {
// 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();
PointerRec *L = getSomePointer();
PointerRec *R = AS.getSomePointer();
// If the pointers are not a must-alias pair, this set becomes a may alias.
if (AA.alias(MemoryLocation(L->getValue(), L->getSize(), L->getAAInfo()),
MemoryLocation(R->getValue(), R->getSize(), R->getAAInfo())) !=
MustAlias)
Alias = SetMayAlias;
}
if (Alias == SetMayAlias) {
if (WasMustAlias)
AST.TotalMayAliasSetSize += size();
if (AS.Alias == SetMustAlias)
AST.TotalMayAliasSetSize += AS.size();
}
bool ASHadUnknownInsts = !AS.UnknownInsts.empty();
if (UnknownInsts.empty()) { // Merge call sites...
if (ASHadUnknownInsts) {
std::swap(UnknownInsts, AS.UnknownInsts);
addRef();
}
} else if (ASHadUnknownInsts) {
UnknownInsts.insert(UnknownInsts.end(), AS.UnknownInsts.begin(), AS.UnknownInsts.end());
AS.UnknownInsts.clear();
}
AS.Forward = this; // Forward across AS now...
addRef(); // AS is now pointing to us...
// Merge the list of constituent pointers...
if (AS.PtrList) {
SetSize += AS.size();
AS.SetSize = 0;
*PtrListEnd = AS.PtrList;
AS.PtrList->setPrevInList(PtrListEnd);
PtrListEnd = AS.PtrListEnd;
AS.PtrList = nullptr;
AS.PtrListEnd = &AS.PtrList;
assert(*AS.PtrListEnd == nullptr && "End of list is not null?");
}
if (ASHadUnknownInsts)
AS.dropRef(AST);
}
void AliasSetTracker::removeAliasSet(AliasSet *AS) {
if (AliasSet *Fwd = AS->Forward) {
Fwd->dropRef(*this);
AS->Forward = nullptr;
} else // Update TotalMayAliasSetSize only if not forwarding.
if (AS->Alias == AliasSet::SetMayAlias)
TotalMayAliasSetSize -= AS->size();
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, PointerRec &Entry,
LocationSize Size, const AAMDNodes &AAInfo,
bool KnownMustAlias) {
assert(!Entry.hasAliasSet() && "Entry already in set!");
// Check to see if we have to downgrade to _may_ alias.
if (isMustAlias() && !KnownMustAlias)
if (PointerRec *P = getSomePointer()) {
AliasAnalysis &AA = AST.getAliasAnalysis();
AliasResult Result =
AA.alias(MemoryLocation(P->getValue(), P->getSize(), P->getAAInfo()),
MemoryLocation(Entry.getValue(), Size, AAInfo));
if (Result != MustAlias) {
Alias = SetMayAlias;
AST.TotalMayAliasSetSize += size();
} else {
// First entry of must alias must have maximum size!
P->updateSizeAndAAInfo(Size, AAInfo);
}
assert(Result != NoAlias && "Cannot be part of must set!");
}
Entry.setAliasSet(this);
Entry.updateSizeAndAAInfo(Size, AAInfo);
// Add it to the end of the list...
++SetSize;
assert(*PtrListEnd == nullptr && "End of list is not null?");
*PtrListEnd = &Entry;
PtrListEnd = Entry.setPrevInList(PtrListEnd);
assert(*PtrListEnd == nullptr && "End of list is not null?");
// Entry points to alias set.
addRef();
if (Alias == SetMayAlias)
AST.TotalMayAliasSetSize++;
}
void AliasSet::addUnknownInst(Instruction *I, AliasAnalysis &AA) {
if (UnknownInsts.empty())
addRef();
UnknownInsts.emplace_back(I);
// Guards are marked as modifying memory for control flow modelling purposes,
// but don't actually modify any specific memory location.
using namespace PatternMatch;
bool MayWriteMemory = I->mayWriteToMemory() && !isGuard(I) &&
!(I->use_empty() && match(I, m_Intrinsic<Intrinsic::invariant_start>()));
if (!MayWriteMemory) {
Alias = SetMayAlias;
Access |= RefAccess;
return;
}
// FIXME: This should use mod/ref information to make this not suck so bad
Alias = SetMayAlias;
Access = ModRefAccess;
}
/// aliasesPointer - Return true if the specified pointer "may" (or must)
/// alias one of the members in the set.
///
bool AliasSet::aliasesPointer(const Value *Ptr, LocationSize Size,
const AAMDNodes &AAInfo,
AliasAnalysis &AA) const {
if (AliasAny)
return true;
if (Alias == SetMustAlias) {
assert(UnknownInsts.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.
PointerRec *SomePtr = getSomePointer();
assert(SomePtr && "Empty must-alias set??");
return AA.alias(MemoryLocation(SomePtr->getValue(), SomePtr->getSize(),
SomePtr->getAAInfo()),
MemoryLocation(Ptr, Size, AAInfo));
}
// 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(MemoryLocation(Ptr, Size, AAInfo),
MemoryLocation(I.getPointer(), I.getSize(), I.getAAInfo())))
return true;
// Check the unknown instructions...
if (!UnknownInsts.empty()) {
for (unsigned i = 0, e = UnknownInsts.size(); i != e; ++i)
if (auto *Inst = getUnknownInst(i))
if (isModOrRefSet(
AA.getModRefInfo(Inst, MemoryLocation(Ptr, Size, AAInfo))))
return true;
}
return false;
}
bool AliasSet::aliasesUnknownInst(const Instruction *Inst,
AliasAnalysis &AA) const {
if (AliasAny)
return true;
assert(Inst->mayReadOrWriteMemory() &&
"Instruction must either read or write memory.");
for (unsigned i = 0, e = UnknownInsts.size(); i != e; ++i) {
if (auto *UnknownInst = getUnknownInst(i)) {
const auto *C1 = dyn_cast<CallBase>(UnknownInst);
const auto *C2 = dyn_cast<CallBase>(Inst);
if (!C1 || !C2 || isModOrRefSet(AA.getModRefInfo(C1, C2)) ||
isModOrRefSet(AA.getModRefInfo(C2, C1)))
return true;
}
}
for (iterator I = begin(), E = end(); I != E; ++I)
if (isModOrRefSet(AA.getModRefInfo(
Inst, MemoryLocation(I.getPointer(), I.getSize(), I.getAAInfo()))))
return true;
return false;
}
Instruction* AliasSet::getUniqueInstruction() {
if (AliasAny)
// May have collapses alias set
return nullptr;
if (begin() != end()) {
if (!UnknownInsts.empty())
// Another instruction found
return nullptr;
if (std::next(begin()) != end())
// Another instruction found
return nullptr;
Value *Addr = begin()->getValue();
assert(!Addr->user_empty() &&
"where's the instruction which added this pointer?");
if (std::next(Addr->user_begin()) != Addr->user_end())
// Another instruction found -- this is really restrictive
// TODO: generalize!
return nullptr;
return cast<Instruction>(*(Addr->user_begin()));
}
if (1 != UnknownInsts.size())
return nullptr;
return cast<Instruction>(UnknownInsts[0]);
}
void AliasSetTracker::clear() {
// Delete all the PointerRec entries.
for (PointerMapType::iterator I = PointerMap.begin(), E = PointerMap.end();
I != E; ++I)
I->second->eraseFromList();
PointerMap.clear();
// The alias sets should all be clear now.
AliasSets.clear();
}
/// mergeAliasSetsForPointer - Given a pointer, merge all alias sets that may
/// alias the pointer. Return the unified set, or nullptr if no set that aliases
/// the pointer was found.
AliasSet *AliasSetTracker::mergeAliasSetsForPointer(const Value *Ptr,
LocationSize Size,
const AAMDNodes &AAInfo) {
AliasSet *FoundSet = nullptr;
for (iterator I = begin(), E = end(); I != E;) {
iterator Cur = I++;
if (Cur->Forward || !Cur->aliasesPointer(Ptr, Size, AAInfo, AA)) continue;
if (!FoundSet) { // If this is the first alias set ptr can go into.
FoundSet = &*Cur; // Remember it.
} else { // Otherwise, we must merge the sets.
FoundSet->mergeSetIn(*Cur, *this); // Merge in contents.
}
}
return FoundSet;
}
AliasSet *AliasSetTracker::findAliasSetForUnknownInst(Instruction *Inst) {
AliasSet *FoundSet = nullptr;
for (iterator I = begin(), E = end(); I != E;) {
iterator Cur = I++;
if (Cur->Forward || !Cur->aliasesUnknownInst(Inst, AA))
continue;
if (!FoundSet) // If this is the first alias set ptr can go into.
FoundSet = &*Cur; // Remember it.
else // Otherwise, we must merge the sets.
FoundSet->mergeSetIn(*Cur, *this); // Merge in contents.
}
return FoundSet;
}
AliasSet &AliasSetTracker::getAliasSetFor(const MemoryLocation &MemLoc) {
Value * const Pointer = const_cast<Value*>(MemLoc.Ptr);
const LocationSize Size = MemLoc.Size;
const AAMDNodes &AAInfo = MemLoc.AATags;
AliasSet::PointerRec &Entry = getEntryFor(Pointer);
if (AliasAnyAS) {
// At this point, the AST is saturated, so we only have one active alias
// set. That means we already know which alias set we want to return, and
// just need to add the pointer to that set to keep the data structure
// consistent.
// This, of course, means that we will never need a merge here.
if (Entry.hasAliasSet()) {
Entry.updateSizeAndAAInfo(Size, AAInfo);
assert(Entry.getAliasSet(*this) == AliasAnyAS &&
"Entry in saturated AST must belong to only alias set");
} else {
AliasAnyAS->addPointer(*this, Entry, Size, AAInfo);
}
return *AliasAnyAS;
}
// Check to see if the pointer is already known.
if (Entry.hasAliasSet()) {
// If the size changed, we may need to merge several alias sets.
// Note that we can *not* return the result of mergeAliasSetsForPointer
// due to a quirk of alias analysis behavior. Since alias(undef, undef)
// is NoAlias, mergeAliasSetsForPointer(undef, ...) will not find the
// the right set for undef, even if it exists.
if (Entry.updateSizeAndAAInfo(Size, AAInfo))
mergeAliasSetsForPointer(Pointer, Size, AAInfo);
// Return the set!
return *Entry.getAliasSet(*this)->getForwardedTarget(*this);
}
if (AliasSet *AS = mergeAliasSetsForPointer(Pointer, Size, AAInfo)) {
// Add it to the alias set it aliases.
AS->addPointer(*this, Entry, Size, AAInfo);
return *AS;
}
// Otherwise create a new alias set to hold the loaded pointer.
AliasSets.push_back(new AliasSet());
AliasSets.back().addPointer(*this, Entry, Size, AAInfo);
return AliasSets.back();
}
void AliasSetTracker::add(Value *Ptr, LocationSize Size,
const AAMDNodes &AAInfo) {
addPointer(MemoryLocation(Ptr, Size, AAInfo), AliasSet::NoAccess);
}
void AliasSetTracker::add(LoadInst *LI) {
if (isStrongerThanMonotonic(LI->getOrdering()))
return addUnknown(LI);
addPointer(MemoryLocation::get(LI), AliasSet::RefAccess);
}
void AliasSetTracker::add(StoreInst *SI) {
if (isStrongerThanMonotonic(SI->getOrdering()))
return addUnknown(SI);
addPointer(MemoryLocation::get(SI), AliasSet::ModAccess);
}
void AliasSetTracker::add(VAArgInst *VAAI) {
addPointer(MemoryLocation::get(VAAI), AliasSet::ModRefAccess);
}
void AliasSetTracker::add(AnyMemSetInst *MSI) {
addPointer(MemoryLocation::getForDest(MSI), AliasSet::ModAccess);
}
void AliasSetTracker::add(AnyMemTransferInst *MTI) {
addPointer(MemoryLocation::getForDest(MTI), AliasSet::ModAccess);
addPointer(MemoryLocation::getForSource(MTI), AliasSet::RefAccess);
}
void AliasSetTracker::addUnknown(Instruction *Inst) {
if (isa<DbgInfoIntrinsic>(Inst))
return; // Ignore DbgInfo Intrinsics.
if (auto *II = dyn_cast<IntrinsicInst>(Inst)) {
// These intrinsics will show up as affecting memory, but they are just
// markers.
switch (II->getIntrinsicID()) {
default:
break;
// FIXME: Add lifetime/invariant intrinsics (See: PR30807).
case Intrinsic::assume:
case Intrinsic::sideeffect:
return;
}
}
if (!Inst->mayReadOrWriteMemory())
return; // doesn't alias anything
AliasSet *AS = findAliasSetForUnknownInst(Inst);
if (AS) {
AS->addUnknownInst(Inst, AA);
return;
}
AliasSets.push_back(new AliasSet());
AS = &AliasSets.back();
AS->addUnknownInst(Inst, AA);
}
void AliasSetTracker::add(Instruction *I) {
// Dispatch to one of the other add methods.
if (LoadInst *LI = dyn_cast<LoadInst>(I))
return add(LI);
if (StoreInst *SI = dyn_cast<StoreInst>(I))
return add(SI);
if (VAArgInst *VAAI = dyn_cast<VAArgInst>(I))
return add(VAAI);
if (AnyMemSetInst *MSI = dyn_cast<AnyMemSetInst>(I))
return add(MSI);
if (AnyMemTransferInst *MTI = dyn_cast<AnyMemTransferInst>(I))
return add(MTI);
// Handle all calls with known mod/ref sets genericall
if (auto *Call = dyn_cast<CallBase>(I))
if (Call->onlyAccessesArgMemory()) {
auto getAccessFromModRef = [](ModRefInfo MRI) {
if (isRefSet(MRI) && isModSet(MRI))
return AliasSet::ModRefAccess;
else if (isModSet(MRI))
return AliasSet::ModAccess;
else if (isRefSet(MRI))
return AliasSet::RefAccess;
else
return AliasSet::NoAccess;
};
ModRefInfo CallMask = createModRefInfo(AA.getModRefBehavior(Call));
// Some intrinsics are marked as modifying memory for control flow
// modelling purposes, but don't actually modify any specific memory
// location.
using namespace PatternMatch;
if (Call->use_empty() &&
match(Call, m_Intrinsic<Intrinsic::invariant_start>()))
CallMask = clearMod(CallMask);
for (auto IdxArgPair : enumerate(Call->args())) {
int ArgIdx = IdxArgPair.index();
const Value *Arg = IdxArgPair.value();
if (!Arg->getType()->isPointerTy())
continue;
MemoryLocation ArgLoc =
MemoryLocation::getForArgument(Call, ArgIdx, nullptr);
ModRefInfo ArgMask = AA.getArgModRefInfo(Call, ArgIdx);
ArgMask = intersectModRef(CallMask, ArgMask);
if (!isNoModRef(ArgMask))
addPointer(ArgLoc, getAccessFromModRef(ArgMask));
}
return;
}
return addUnknown(I);
}
void AliasSetTracker::add(BasicBlock &BB) {
for (auto &I : BB)
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 AliasSet &AS : AST) {
if (AS.Forward)
continue; // Ignore forwarding alias sets
// If there are any call sites in the alias set, add them to this AST.
for (unsigned i = 0, e = AS.UnknownInsts.size(); i != e; ++i)
if (auto *Inst = AS.getUnknownInst(i))
add(Inst);
// Loop over all of the pointers in this alias set.
for (AliasSet::iterator ASI = AS.begin(), E = AS.end(); ASI != E; ++ASI)
addPointer(
MemoryLocation(ASI.getPointer(), ASI.getSize(), ASI.getAAInfo()),
(AliasSet::AccessLattice)AS.Access);
}
}
// 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) {
// First, look up the PointerRec for this pointer.
PointerMapType::iterator I = PointerMap.find_as(PtrVal);
if (I == PointerMap.end()) return; // Noop
// If we found one, remove the pointer from the alias set it is in.
AliasSet::PointerRec *PtrValEnt = I->second;
AliasSet *AS = PtrValEnt->getAliasSet(*this);
// Unlink and delete from the list of values.
PtrValEnt->eraseFromList();
if (AS->Alias == AliasSet::SetMayAlias) {
AS->SetSize--;
TotalMayAliasSetSize--;
}
// 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) {
// First, look up the PointerRec for this pointer.
PointerMapType::iterator I = PointerMap.find_as(From);
if (I == PointerMap.end())
return; // Noop
assert(I->second->hasAliasSet() && "Dead entry?");
AliasSet::PointerRec &Entry = getEntryFor(To);
if (Entry.hasAliasSet()) return; // Already in the tracker!
// getEntryFor above may invalidate iterator \c I, so reinitialize it.
I = PointerMap.find_as(From);
// Add it to the alias set it aliases...
AliasSet *AS = I->second->getAliasSet(*this);
AS->addPointer(*this, Entry, I->second->getSize(),
I->second->getAAInfo(),
true);
}
AliasSet &AliasSetTracker::mergeAllAliasSets() {
assert(!AliasAnyAS && (TotalMayAliasSetSize > SaturationThreshold) &&
"Full merge should happen once, when the saturation threshold is "
"reached");
// Collect all alias sets, so that we can drop references with impunity
// without worrying about iterator invalidation.
std::vector<AliasSet *> ASVector;
ASVector.reserve(SaturationThreshold);
for (iterator I = begin(), E = end(); I != E; I++)
ASVector.push_back(&*I);
// Copy all instructions and pointers into a new set, and forward all other
// sets to it.
AliasSets.push_back(new AliasSet());
AliasAnyAS = &AliasSets.back();
AliasAnyAS->Alias = AliasSet::SetMayAlias;
AliasAnyAS->Access = AliasSet::ModRefAccess;
AliasAnyAS->AliasAny = true;
for (auto Cur : ASVector) {
// If Cur was already forwarding, just forward to the new AS instead.
AliasSet *FwdTo = Cur->Forward;
if (FwdTo) {
Cur->Forward = AliasAnyAS;
AliasAnyAS->addRef();
FwdTo->dropRef(*this);
continue;
}
// Otherwise, perform the actual merge.
AliasAnyAS->mergeSetIn(*Cur, *this);
}
return *AliasAnyAS;
}
AliasSet &AliasSetTracker::addPointer(MemoryLocation Loc,
AliasSet::AccessLattice E) {
AliasSet &AS = getAliasSetFor(Loc);
AS.Access |= E;
if (!AliasAnyAS && (TotalMayAliasSetSize > SaturationThreshold)) {
// The AST is now saturated. From here on, we conservatively consider all
// pointers to alias each-other.
return mergeAllAliasSets();
}
return AS;
}
//===----------------------------------------------------------------------===//
// AliasSet/AliasSetTracker Printing Support
//===----------------------------------------------------------------------===//
void AliasSet::print(raw_ostream &OS) const {
OS << " AliasSet[" << (const void*)this << ", " << RefCount << "] ";
OS << (Alias == SetMustAlias ? "must" : "may") << " alias, ";
switch (Access) {
case NoAccess: OS << "No access "; break;
case RefAccess: OS << "Ref "; break;
case ModAccess: OS << "Mod "; break;
case ModRefAccess: OS << "Mod/Ref "; break;
default: llvm_unreachable("Bad value for Access!");
}
if (Forward)
OS << " forwarding to " << (void*)Forward;
if (!empty()) {
OS << "Pointers: ";
for (iterator I = begin(), E = end(); I != E; ++I) {
if (I != begin()) OS << ", ";
I.getPointer()->printAsOperand(OS << "(");
if (I.getSize() == LocationSize::unknown())
OS << ", unknown)";
else
OS << ", " << I.getSize() << ")";
}
}
if (!UnknownInsts.empty()) {
OS << "\n " << UnknownInsts.size() << " Unknown instructions: ";
for (unsigned i = 0, e = UnknownInsts.size(); i != e; ++i) {
if (i) OS << ", ";
if (auto *I = getUnknownInst(i)) {
if (I->hasName())
I->printAsOperand(OS);
else
I->print(OS);
}
}
}
OS << "\n";
}
void AliasSetTracker::print(raw_ostream &OS) const {
OS << "Alias Set Tracker: " << AliasSets.size() << " alias sets for "
<< PointerMap.size() << " pointer values.\n";
for (const AliasSet &AS : *this)
AS.print(OS);
OS << "\n";
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void AliasSet::dump() const { print(dbgs()); }
LLVM_DUMP_METHOD void AliasSetTracker::dump() const { print(dbgs()); }
#endif
//===----------------------------------------------------------------------===//
// ASTCallbackVH Class Implementation
//===----------------------------------------------------------------------===//
void AliasSetTracker::ASTCallbackVH::deleted() {
assert(AST && "ASTCallbackVH called with a null AliasSetTracker!");
AST->deleteValue(getValPtr());
// this now dangles!
}
void AliasSetTracker::ASTCallbackVH::allUsesReplacedWith(Value *V) {
AST->copyValue(getValPtr(), V);
}
AliasSetTracker::ASTCallbackVH::ASTCallbackVH(Value *V, AliasSetTracker *ast)
: CallbackVH(V), AST(ast) {}
AliasSetTracker::ASTCallbackVH &
AliasSetTracker::ASTCallbackVH::operator=(Value *V) {
return *this = ASTCallbackVH(V, AST);
}
//===----------------------------------------------------------------------===//
// AliasSetPrinter Pass
//===----------------------------------------------------------------------===//
namespace {
class AliasSetPrinter : public FunctionPass {
AliasSetTracker *Tracker;
public:
static char ID; // Pass identification, replacement for typeid
AliasSetPrinter() : FunctionPass(ID) {
initializeAliasSetPrinterPass(*PassRegistry::getPassRegistry());
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesAll();
AU.addRequired<AAResultsWrapperPass>();
}
bool runOnFunction(Function &F) override {
auto &AAWP = getAnalysis<AAResultsWrapperPass>();
Tracker = new AliasSetTracker(AAWP.getAAResults());
errs() << "Alias sets for function '" << F.getName() << "':\n";
for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I)
Tracker->add(&*I);
Tracker->print(errs());
delete Tracker;
return false;
}
};
} // end anonymous namespace
char AliasSetPrinter::ID = 0;
INITIALIZE_PASS_BEGIN(AliasSetPrinter, "print-alias-sets",
"Alias Set Printer", false, true)
INITIALIZE_PASS_DEPENDENCY(AAResultsWrapperPass)
INITIALIZE_PASS_END(AliasSetPrinter, "print-alias-sets",
"Alias Set Printer", false, true)
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