2009-06-02 17:52:33 +00:00
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//===- AliasSetTracker.cpp - Alias Sets Tracker implementation-------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the AliasSetTracker and AliasSet classes.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/AliasSetTracker.h"
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#include "llvm/Analysis/AliasAnalysis.h"
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2013-04-08 18:41:23 +00:00
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#include "llvm/IR/DataLayout.h"
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2014-11-24 09:08:18 +00:00
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#include "llvm/IR/InstIterator.h"
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2013-04-08 18:41:23 +00:00
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Type.h"
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#include "llvm/Pass.h"
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2010-01-01 10:31:22 +00:00
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#include "llvm/Support/Debug.h"
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2009-10-14 17:57:32 +00:00
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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2009-06-02 17:52:33 +00:00
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using namespace llvm;
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/// mergeSetIn - Merge the specified alias set into this alias set.
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///
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void AliasSet::mergeSetIn(AliasSet &AS, AliasSetTracker &AST) {
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assert(!AS.Forward && "Alias set is already forwarding!");
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assert(!Forward && "This set is a forwarding set!!");
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// Update the alias and access types of this set...
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AccessTy |= AS.AccessTy;
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AliasTy |= AS.AliasTy;
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Volatile |= AS.Volatile;
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2009-06-02 17:52:33 +00:00
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if (AliasTy == MustAlias) {
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// Check that these two merged sets really are must aliases. Since both
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// used to be must-alias sets, we can just check any pointer from each set
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// for aliasing.
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AliasAnalysis &AA = AST.getAliasAnalysis();
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PointerRec *L = getSomePointer();
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PointerRec *R = AS.getSomePointer();
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// If the pointers are not a must-alias pair, this set becomes a may alias.
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2011-02-20 12:57:14 +00:00
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if (AA.alias(AliasAnalysis::Location(L->getValue(),
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L->getSize(),
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L->getTBAAInfo()),
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AliasAnalysis::Location(R->getValue(),
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R->getSize(),
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R->getTBAAInfo()))
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2009-06-02 17:52:33 +00:00
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!= AliasAnalysis::MustAlias)
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AliasTy = MayAlias;
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}
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2011-10-20 21:10:27 +00:00
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if (UnknownInsts.empty()) { // Merge call sites...
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if (!AS.UnknownInsts.empty())
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std::swap(UnknownInsts, AS.UnknownInsts);
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} else if (!AS.UnknownInsts.empty()) {
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UnknownInsts.insert(UnknownInsts.end(), AS.UnknownInsts.begin(), AS.UnknownInsts.end());
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AS.UnknownInsts.clear();
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2009-06-02 17:52:33 +00:00
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}
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AS.Forward = this; // Forward across AS now...
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addRef(); // AS is now pointing to us...
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// Merge the list of constituent pointers...
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if (AS.PtrList) {
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*PtrListEnd = AS.PtrList;
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AS.PtrList->setPrevInList(PtrListEnd);
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PtrListEnd = AS.PtrListEnd;
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AS.PtrList = nullptr;
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AS.PtrListEnd = &AS.PtrList;
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assert(*AS.PtrListEnd == nullptr && "End of list is not null?");
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2009-06-02 17:52:33 +00:00
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}
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}
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void AliasSetTracker::removeAliasSet(AliasSet *AS) {
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if (AliasSet *Fwd = AS->Forward) {
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Fwd->dropRef(*this);
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AS->Forward = nullptr;
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}
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AliasSets.erase(AS);
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}
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void AliasSet::removeFromTracker(AliasSetTracker &AST) {
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assert(RefCount == 0 && "Cannot remove non-dead alias set from tracker!");
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AST.removeAliasSet(this);
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}
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void AliasSet::addPointer(AliasSetTracker &AST, PointerRec &Entry,
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uint64_t Size, const MDNode *TBAAInfo,
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bool KnownMustAlias) {
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assert(!Entry.hasAliasSet() && "Entry already in set!");
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// Check to see if we have to downgrade to _may_ alias.
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if (isMustAlias() && !KnownMustAlias)
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if (PointerRec *P = getSomePointer()) {
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AliasAnalysis &AA = AST.getAliasAnalysis();
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AliasAnalysis::AliasResult Result =
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2011-02-20 12:57:14 +00:00
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AA.alias(AliasAnalysis::Location(P->getValue(), P->getSize(),
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P->getTBAAInfo()),
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AliasAnalysis::Location(Entry.getValue(), Size, TBAAInfo));
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if (Result != AliasAnalysis::MustAlias)
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AliasTy = MayAlias;
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else // First entry of must alias must have maximum size!
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2011-02-20 12:57:14 +00:00
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P->updateSizeAndTBAAInfo(Size, TBAAInfo);
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2009-06-02 17:52:33 +00:00
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assert(Result != AliasAnalysis::NoAlias && "Cannot be part of must set!");
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}
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Entry.setAliasSet(this);
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2011-02-20 12:57:14 +00:00
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Entry.updateSizeAndTBAAInfo(Size, TBAAInfo);
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2009-06-02 17:52:33 +00:00
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// Add it to the end of the list...
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assert(*PtrListEnd == nullptr && "End of list is not null?");
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2009-06-02 17:52:33 +00:00
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*PtrListEnd = &Entry;
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PtrListEnd = Entry.setPrevInList(PtrListEnd);
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2014-11-24 09:08:18 +00:00
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assert(*PtrListEnd == nullptr && "End of list is not null?");
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2010-09-17 15:48:55 +00:00
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addRef(); // Entry points to alias set.
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2009-06-02 17:52:33 +00:00
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}
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2011-10-20 21:10:27 +00:00
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void AliasSet::addUnknownInst(Instruction *I, AliasAnalysis &AA) {
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UnknownInsts.push_back(I);
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2009-06-02 17:52:33 +00:00
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2011-10-20 21:10:27 +00:00
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if (!I->mayWriteToMemory()) {
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2009-06-02 17:52:33 +00:00
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AliasTy = MayAlias;
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AccessTy |= Refs;
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return;
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}
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// FIXME: This should use mod/ref information to make this not suck so bad
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AliasTy = MayAlias;
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AccessTy = ModRef;
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}
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/// aliasesPointer - Return true if the specified pointer "may" (or must)
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/// alias one of the members in the set.
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///
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2011-02-20 12:57:14 +00:00
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bool AliasSet::aliasesPointer(const Value *Ptr, uint64_t Size,
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const MDNode *TBAAInfo,
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AliasAnalysis &AA) const {
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if (AliasTy == MustAlias) {
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2011-10-20 21:10:27 +00:00
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assert(UnknownInsts.empty() && "Illegal must alias set!");
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2009-06-02 17:52:33 +00:00
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// If this is a set of MustAliases, only check to see if the pointer aliases
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2010-09-17 15:48:55 +00:00
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// SOME value in the set.
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2009-06-02 17:52:33 +00:00
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PointerRec *SomePtr = getSomePointer();
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assert(SomePtr && "Empty must-alias set??");
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2011-02-20 12:57:14 +00:00
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return AA.alias(AliasAnalysis::Location(SomePtr->getValue(),
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SomePtr->getSize(),
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SomePtr->getTBAAInfo()),
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AliasAnalysis::Location(Ptr, Size, TBAAInfo));
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2009-06-02 17:52:33 +00:00
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}
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// If this is a may-alias set, we have to check all of the pointers in the set
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// to be sure it doesn't alias the set...
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for (iterator I = begin(), E = end(); I != E; ++I)
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2011-02-20 12:57:14 +00:00
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if (AA.alias(AliasAnalysis::Location(Ptr, Size, TBAAInfo),
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AliasAnalysis::Location(I.getPointer(), I.getSize(),
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I.getTBAAInfo())))
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2009-06-02 17:52:33 +00:00
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return true;
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2011-10-20 21:10:27 +00:00
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// Check the unknown instructions...
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if (!UnknownInsts.empty()) {
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for (unsigned i = 0, e = UnknownInsts.size(); i != e; ++i)
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if (AA.getModRefInfo(UnknownInsts[i],
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2011-02-20 12:57:14 +00:00
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AliasAnalysis::Location(Ptr, Size, TBAAInfo)) !=
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AliasAnalysis::NoModRef)
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2009-06-02 17:52:33 +00:00
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return true;
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}
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return false;
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}
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2011-10-20 21:10:27 +00:00
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bool AliasSet::aliasesUnknownInst(Instruction *Inst, AliasAnalysis &AA) const {
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if (!Inst->mayReadOrWriteMemory())
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2009-06-02 17:52:33 +00:00
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return false;
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2011-10-20 21:10:27 +00:00
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for (unsigned i = 0, e = UnknownInsts.size(); i != e; ++i) {
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CallSite C1 = getUnknownInst(i), C2 = Inst;
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if (!C1 || !C2 ||
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AA.getModRefInfo(C1, C2) != AliasAnalysis::NoModRef ||
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AA.getModRefInfo(C2, C1) != AliasAnalysis::NoModRef)
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2009-06-02 17:52:33 +00:00
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return true;
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2010-09-17 15:48:55 +00:00
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}
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2009-06-02 17:52:33 +00:00
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for (iterator I = begin(), E = end(); I != E; ++I)
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2012-04-14 13:54:10 +00:00
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if (AA.getModRefInfo(Inst, AliasAnalysis::Location(I.getPointer(),
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I.getSize(),
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I.getTBAAInfo())) !=
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2009-06-02 17:52:33 +00:00
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AliasAnalysis::NoModRef)
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return true;
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return false;
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}
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void AliasSetTracker::clear() {
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// Delete all the PointerRec entries.
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2009-10-14 17:57:32 +00:00
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for (PointerMapType::iterator I = PointerMap.begin(), E = PointerMap.end();
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I != E; ++I)
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2009-06-02 17:52:33 +00:00
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I->second->eraseFromList();
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PointerMap.clear();
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// The alias sets should all be clear now.
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AliasSets.clear();
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}
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/// findAliasSetForPointer - Given a pointer, find the one alias set to put the
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/// instruction referring to the pointer into. If there are multiple alias sets
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/// that may alias the pointer, merge them together and return the unified set.
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///
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AliasSet *AliasSetTracker::findAliasSetForPointer(const Value *Ptr,
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2011-02-20 12:57:14 +00:00
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uint64_t Size,
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const MDNode *TBAAInfo) {
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2014-11-24 09:08:18 +00:00
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AliasSet *FoundSet = nullptr;
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for (iterator I = begin(), E = end(); I != E; ++I) {
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2011-02-20 12:57:14 +00:00
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if (I->Forward || !I->aliasesPointer(Ptr, Size, TBAAInfo, AA)) continue;
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2010-09-17 15:48:55 +00:00
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2014-11-24 09:08:18 +00:00
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if (!FoundSet) { // If this is the first alias set ptr can go into.
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FoundSet = I; // Remember it.
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} else { // Otherwise, we must merge the sets.
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FoundSet->mergeSetIn(*I, *this); // Merge in contents.
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}
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}
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return FoundSet;
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}
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/// containsPointer - Return true if the specified location is represented by
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/// this alias set, false otherwise. This does not modify the AST object or
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/// alias sets.
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2011-02-20 12:57:14 +00:00
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bool AliasSetTracker::containsPointer(Value *Ptr, uint64_t Size,
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const MDNode *TBAAInfo) const {
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2009-06-02 17:52:33 +00:00
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for (const_iterator I = begin(), E = end(); I != E; ++I)
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2011-02-20 12:57:14 +00:00
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if (!I->Forward && I->aliasesPointer(Ptr, Size, TBAAInfo, AA))
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return true;
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return false;
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}
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2011-10-20 21:10:27 +00:00
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AliasSet *AliasSetTracker::findAliasSetForUnknownInst(Instruction *Inst) {
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2014-11-24 09:08:18 +00:00
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AliasSet *FoundSet = nullptr;
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2010-09-17 15:48:55 +00:00
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for (iterator I = begin(), E = end(); I != E; ++I) {
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2011-10-20 21:10:27 +00:00
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if (I->Forward || !I->aliasesUnknownInst(Inst, AA))
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continue;
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2014-11-24 09:08:18 +00:00
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if (!FoundSet) // If this is the first alias set ptr can go into.
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2010-09-17 15:48:55 +00:00
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FoundSet = I; // Remember it.
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else if (!I->Forward) // Otherwise, we must merge the sets.
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FoundSet->mergeSetIn(*I, *this); // Merge in contents.
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}
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2009-06-02 17:52:33 +00:00
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return FoundSet;
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}
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/// getAliasSetForPointer - Return the alias set that the specified pointer
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/// lives in.
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2011-02-20 12:57:14 +00:00
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AliasSet &AliasSetTracker::getAliasSetForPointer(Value *Pointer, uint64_t Size,
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const MDNode *TBAAInfo,
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bool *New) {
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AliasSet::PointerRec &Entry = getEntryFor(Pointer);
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// Check to see if the pointer is already known.
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if (Entry.hasAliasSet()) {
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2011-02-20 12:57:14 +00:00
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Entry.updateSizeAndTBAAInfo(Size, TBAAInfo);
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2009-06-02 17:52:33 +00:00
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// Return the set!
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return *Entry.getAliasSet(*this)->getForwardedTarget(*this);
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2010-09-17 15:48:55 +00:00
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}
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2011-02-20 12:57:14 +00:00
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if (AliasSet *AS = findAliasSetForPointer(Pointer, Size, TBAAInfo)) {
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2010-09-17 15:48:55 +00:00
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// Add it to the alias set it aliases.
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2011-02-20 12:57:14 +00:00
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AS->addPointer(*this, Entry, Size, TBAAInfo);
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2009-06-02 17:52:33 +00:00
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return *AS;
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}
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2010-09-17 15:48:55 +00:00
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if (New) *New = true;
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// Otherwise create a new alias set to hold the loaded pointer.
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AliasSets.push_back(new AliasSet());
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2011-02-20 12:57:14 +00:00
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AliasSets.back().addPointer(*this, Entry, Size, TBAAInfo);
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return AliasSets.back();
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}
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2011-02-20 12:57:14 +00:00
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bool AliasSetTracker::add(Value *Ptr, uint64_t Size, const MDNode *TBAAInfo) {
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bool NewPtr;
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2011-02-20 12:57:14 +00:00
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addPointer(Ptr, Size, TBAAInfo, AliasSet::NoModRef, NewPtr);
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return NewPtr;
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|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bool AliasSetTracker::add(LoadInst *LI) {
|
2011-10-20 21:10:27 +00:00
|
|
|
if (LI->getOrdering() > Monotonic) return addUnknown(LI);
|
|
|
|
AliasSet::AccessType ATy = AliasSet::Refs;
|
2009-06-02 17:52:33 +00:00
|
|
|
bool NewPtr;
|
|
|
|
AliasSet &AS = addPointer(LI->getOperand(0),
|
2009-10-14 17:57:32 +00:00
|
|
|
AA.getTypeStoreSize(LI->getType()),
|
2011-02-20 12:57:14 +00:00
|
|
|
LI->getMetadata(LLVMContext::MD_tbaa),
|
2011-10-20 21:10:27 +00:00
|
|
|
ATy, NewPtr);
|
2009-06-02 17:52:33 +00:00
|
|
|
if (LI->isVolatile()) AS.setVolatile();
|
|
|
|
return NewPtr;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool AliasSetTracker::add(StoreInst *SI) {
|
2011-10-20 21:10:27 +00:00
|
|
|
if (SI->getOrdering() > Monotonic) return addUnknown(SI);
|
|
|
|
AliasSet::AccessType ATy = AliasSet::Mods;
|
2009-06-02 17:52:33 +00:00
|
|
|
bool NewPtr;
|
|
|
|
Value *Val = SI->getOperand(0);
|
|
|
|
AliasSet &AS = addPointer(SI->getOperand(1),
|
2009-10-14 17:57:32 +00:00
|
|
|
AA.getTypeStoreSize(Val->getType()),
|
2011-02-20 12:57:14 +00:00
|
|
|
SI->getMetadata(LLVMContext::MD_tbaa),
|
2011-10-20 21:10:27 +00:00
|
|
|
ATy, NewPtr);
|
2009-06-02 17:52:33 +00:00
|
|
|
if (SI->isVolatile()) AS.setVolatile();
|
|
|
|
return NewPtr;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool AliasSetTracker::add(VAArgInst *VAAI) {
|
|
|
|
bool NewPtr;
|
2011-02-20 12:57:14 +00:00
|
|
|
addPointer(VAAI->getOperand(0), AliasAnalysis::UnknownSize,
|
|
|
|
VAAI->getMetadata(LLVMContext::MD_tbaa),
|
|
|
|
AliasSet::ModRef, NewPtr);
|
2009-06-02 17:52:33 +00:00
|
|
|
return NewPtr;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2011-10-20 21:10:27 +00:00
|
|
|
bool AliasSetTracker::addUnknown(Instruction *Inst) {
|
|
|
|
if (isa<DbgInfoIntrinsic>(Inst))
|
2009-06-02 17:52:33 +00:00
|
|
|
return true; // Ignore DbgInfo Intrinsics.
|
2011-10-20 21:10:27 +00:00
|
|
|
if (!Inst->mayReadOrWriteMemory())
|
2009-06-02 17:52:33 +00:00
|
|
|
return true; // doesn't alias anything
|
|
|
|
|
2011-10-20 21:10:27 +00:00
|
|
|
AliasSet *AS = findAliasSetForUnknownInst(Inst);
|
2010-09-17 15:48:55 +00:00
|
|
|
if (AS) {
|
2011-10-20 21:10:27 +00:00
|
|
|
AS->addUnknownInst(Inst, AA);
|
2009-06-02 17:52:33 +00:00
|
|
|
return false;
|
|
|
|
}
|
2010-09-17 15:48:55 +00:00
|
|
|
AliasSets.push_back(new AliasSet());
|
|
|
|
AS = &AliasSets.back();
|
2011-10-20 21:10:27 +00:00
|
|
|
AS->addUnknownInst(Inst, AA);
|
2010-09-17 15:48:55 +00:00
|
|
|
return true;
|
2009-06-02 17:52:33 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
bool AliasSetTracker::add(Instruction *I) {
|
2010-09-17 15:48:55 +00:00
|
|
|
// Dispatch to one of the other add methods.
|
2009-06-02 17:52:33 +00:00
|
|
|
if (LoadInst *LI = dyn_cast<LoadInst>(I))
|
|
|
|
return add(LI);
|
2010-09-17 15:48:55 +00:00
|
|
|
if (StoreInst *SI = dyn_cast<StoreInst>(I))
|
2009-06-02 17:52:33 +00:00
|
|
|
return add(SI);
|
2010-09-17 15:48:55 +00:00
|
|
|
if (VAArgInst *VAAI = dyn_cast<VAArgInst>(I))
|
2009-06-02 17:52:33 +00:00
|
|
|
return add(VAAI);
|
2011-10-20 21:10:27 +00:00
|
|
|
return addUnknown(I);
|
2009-06-02 17:52:33 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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.
|
2010-09-17 15:48:55 +00:00
|
|
|
for (const_iterator I = AST.begin(), E = AST.end(); I != E; ++I) {
|
|
|
|
if (I->Forward) continue; // 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.
|
2011-10-20 21:10:27 +00:00
|
|
|
for (unsigned i = 0, e = AS.UnknownInsts.size(); i != e; ++i)
|
|
|
|
add(AS.UnknownInsts[i]);
|
2010-09-17 15:48:55 +00:00
|
|
|
|
|
|
|
// Loop over all of the pointers in this alias set.
|
|
|
|
bool X;
|
|
|
|
for (AliasSet::iterator ASI = AS.begin(), E = AS.end(); ASI != E; ++ASI) {
|
|
|
|
AliasSet &NewAS = addPointer(ASI.getPointer(), ASI.getSize(),
|
2011-02-20 12:57:14 +00:00
|
|
|
ASI.getTBAAInfo(),
|
2010-09-17 15:48:55 +00:00
|
|
|
(AliasSet::AccessType)AS.AccessTy, X);
|
|
|
|
if (AS.isVolatile()) NewAS.setVolatile();
|
2009-06-02 17:52:33 +00:00
|
|
|
}
|
2010-09-17 15:48:55 +00:00
|
|
|
}
|
2009-06-02 17:52:33 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/// remove - Remove the specified (potentially non-empty) alias set from the
|
|
|
|
/// tracker.
|
|
|
|
void AliasSetTracker::remove(AliasSet &AS) {
|
|
|
|
// Drop all call sites.
|
2011-10-20 21:10:27 +00:00
|
|
|
AS.UnknownInsts.clear();
|
2009-06-02 17:52:33 +00:00
|
|
|
|
|
|
|
// Clear the alias set.
|
|
|
|
unsigned NumRefs = 0;
|
|
|
|
while (!AS.empty()) {
|
|
|
|
AliasSet::PointerRec *P = AS.PtrList;
|
|
|
|
|
|
|
|
Value *ValToRemove = P->getValue();
|
|
|
|
|
|
|
|
// Unlink and delete entry from the list of values.
|
|
|
|
P->eraseFromList();
|
|
|
|
|
|
|
|
// Remember how many references need to be dropped.
|
|
|
|
++NumRefs;
|
|
|
|
|
|
|
|
// Finally, remove the entry.
|
|
|
|
PointerMap.erase(ValToRemove);
|
|
|
|
}
|
|
|
|
|
|
|
|
// Stop using the alias set, removing it.
|
|
|
|
AS.RefCount -= NumRefs;
|
|
|
|
if (AS.RefCount == 0)
|
|
|
|
AS.removeFromTracker(*this);
|
|
|
|
}
|
|
|
|
|
2011-02-20 12:57:14 +00:00
|
|
|
bool
|
|
|
|
AliasSetTracker::remove(Value *Ptr, uint64_t Size, const MDNode *TBAAInfo) {
|
|
|
|
AliasSet *AS = findAliasSetForPointer(Ptr, Size, TBAAInfo);
|
2009-06-02 17:52:33 +00:00
|
|
|
if (!AS) return false;
|
|
|
|
remove(*AS);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool AliasSetTracker::remove(LoadInst *LI) {
|
2011-02-20 12:57:14 +00:00
|
|
|
uint64_t Size = AA.getTypeStoreSize(LI->getType());
|
|
|
|
const MDNode *TBAAInfo = LI->getMetadata(LLVMContext::MD_tbaa);
|
|
|
|
AliasSet *AS = findAliasSetForPointer(LI->getOperand(0), Size, TBAAInfo);
|
2009-06-02 17:52:33 +00:00
|
|
|
if (!AS) return false;
|
|
|
|
remove(*AS);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool AliasSetTracker::remove(StoreInst *SI) {
|
2011-02-20 12:57:14 +00:00
|
|
|
uint64_t Size = AA.getTypeStoreSize(SI->getOperand(0)->getType());
|
|
|
|
const MDNode *TBAAInfo = SI->getMetadata(LLVMContext::MD_tbaa);
|
|
|
|
AliasSet *AS = findAliasSetForPointer(SI->getOperand(1), Size, TBAAInfo);
|
2009-06-02 17:52:33 +00:00
|
|
|
if (!AS) return false;
|
|
|
|
remove(*AS);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool AliasSetTracker::remove(VAArgInst *VAAI) {
|
2011-02-20 12:57:14 +00:00
|
|
|
AliasSet *AS = findAliasSetForPointer(VAAI->getOperand(0),
|
|
|
|
AliasAnalysis::UnknownSize,
|
|
|
|
VAAI->getMetadata(LLVMContext::MD_tbaa));
|
2009-06-02 17:52:33 +00:00
|
|
|
if (!AS) return false;
|
|
|
|
remove(*AS);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
2011-10-20 21:10:27 +00:00
|
|
|
bool AliasSetTracker::removeUnknown(Instruction *I) {
|
|
|
|
if (!I->mayReadOrWriteMemory())
|
2009-06-02 17:52:33 +00:00
|
|
|
return false; // doesn't alias anything
|
|
|
|
|
2011-10-20 21:10:27 +00:00
|
|
|
AliasSet *AS = findAliasSetForUnknownInst(I);
|
2009-06-02 17:52:33 +00:00
|
|
|
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);
|
2010-09-17 15:48:55 +00:00
|
|
|
if (StoreInst *SI = dyn_cast<StoreInst>(I))
|
2009-06-02 17:52:33 +00:00
|
|
|
return remove(SI);
|
2010-09-17 15:48:55 +00:00
|
|
|
if (VAArgInst *VAAI = dyn_cast<VAArgInst>(I))
|
2009-06-02 17:52:33 +00:00
|
|
|
return remove(VAAI);
|
2011-10-20 21:10:27 +00:00
|
|
|
return removeUnknown(I);
|
2009-06-02 17:52:33 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
// 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
|
2010-09-17 15:48:55 +00:00
|
|
|
// AliasSet (if present).
|
2011-10-20 21:10:27 +00:00
|
|
|
if (Instruction *Inst = dyn_cast<Instruction>(PtrVal)) {
|
|
|
|
if (Inst->mayReadOrWriteMemory()) {
|
2010-09-17 15:48:55 +00:00
|
|
|
// Scan all the alias sets to see if this call site is contained.
|
|
|
|
for (iterator I = begin(), E = end(); I != E; ++I) {
|
|
|
|
if (I->Forward) continue;
|
|
|
|
|
2011-10-20 21:10:27 +00:00
|
|
|
I->removeUnknownInst(Inst);
|
2010-09-17 15:48:55 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2009-06-02 17:52:33 +00:00
|
|
|
|
|
|
|
// First, look up the PointerRec for this pointer.
|
2012-08-15 19:34:23 +00:00
|
|
|
PointerMapType::iterator I = PointerMap.find_as(PtrVal);
|
2009-06-02 17:52:33 +00:00
|
|
|
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();
|
|
|
|
|
|
|
|
// 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.
|
2012-08-15 19:34:23 +00:00
|
|
|
PointerMapType::iterator I = PointerMap.find_as(From);
|
2009-06-02 17:52:33 +00:00
|
|
|
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!
|
|
|
|
|
|
|
|
// Add it to the alias set it aliases...
|
2012-08-15 19:34:23 +00:00
|
|
|
I = PointerMap.find_as(From);
|
2009-06-02 17:52:33 +00:00
|
|
|
AliasSet *AS = I->second->getAliasSet(*this);
|
2011-02-20 12:57:14 +00:00
|
|
|
AS->addPointer(*this, Entry, I->second->getSize(),
|
|
|
|
I->second->getTBAAInfo(),
|
|
|
|
true);
|
2009-06-02 17:52:33 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// AliasSet/AliasSetTracker Printing Support
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
2009-10-14 17:57:32 +00:00
|
|
|
void AliasSet::print(raw_ostream &OS) const {
|
2012-12-02 13:10:19 +00:00
|
|
|
OS << " AliasSet[" << (const void*)this << ", " << RefCount << "] ";
|
2009-06-02 17:52:33 +00:00
|
|
|
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;
|
2009-10-14 17:57:32 +00:00
|
|
|
default: llvm_unreachable("Bad value for AccessTy!");
|
2009-06-02 17:52:33 +00:00
|
|
|
}
|
|
|
|
if (isVolatile()) OS << "[volatile] ";
|
|
|
|
if (Forward)
|
|
|
|
OS << " forwarding to " << (void*)Forward;
|
|
|
|
|
|
|
|
|
|
|
|
if (!empty()) {
|
|
|
|
OS << "Pointers: ";
|
|
|
|
for (iterator I = begin(), E = end(); I != E; ++I) {
|
|
|
|
if (I != begin()) OS << ", ";
|
2014-11-24 09:08:18 +00:00
|
|
|
I.getPointer()->printAsOperand(OS << "(");
|
2009-06-02 17:52:33 +00:00
|
|
|
OS << ", " << I.getSize() << ")";
|
|
|
|
}
|
|
|
|
}
|
2011-10-20 21:10:27 +00:00
|
|
|
if (!UnknownInsts.empty()) {
|
|
|
|
OS << "\n " << UnknownInsts.size() << " Unknown instructions: ";
|
|
|
|
for (unsigned i = 0, e = UnknownInsts.size(); i != e; ++i) {
|
2009-06-02 17:52:33 +00:00
|
|
|
if (i) OS << ", ";
|
2014-11-24 09:08:18 +00:00
|
|
|
UnknownInsts[i]->printAsOperand(OS);
|
2009-06-02 17:52:33 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
OS << "\n";
|
|
|
|
}
|
|
|
|
|
2009-10-14 17:57:32 +00:00
|
|
|
void AliasSetTracker::print(raw_ostream &OS) const {
|
2009-06-02 17:52:33 +00:00
|
|
|
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";
|
|
|
|
}
|
|
|
|
|
2012-12-02 13:10:19 +00:00
|
|
|
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
|
2010-01-01 10:31:22 +00:00
|
|
|
void AliasSet::dump() const { print(dbgs()); }
|
|
|
|
void AliasSetTracker::dump() const { print(dbgs()); }
|
2012-12-02 13:10:19 +00:00
|
|
|
#endif
|
2009-10-14 17:57:32 +00:00
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//===----------------------------------------------------------------------===//
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// ASTCallbackVH Class Implementation
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//===----------------------------------------------------------------------===//
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void AliasSetTracker::ASTCallbackVH::deleted() {
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assert(AST && "ASTCallbackVH called with a null AliasSetTracker!");
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AST->deleteValue(getValPtr());
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// this now dangles!
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}
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2011-05-02 19:34:44 +00:00
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void AliasSetTracker::ASTCallbackVH::allUsesReplacedWith(Value *V) {
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AST->copyValue(getValPtr(), V);
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}
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2009-10-14 17:57:32 +00:00
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AliasSetTracker::ASTCallbackVH::ASTCallbackVH(Value *V, AliasSetTracker *ast)
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: CallbackVH(V), AST(ast) {}
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AliasSetTracker::ASTCallbackVH &
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AliasSetTracker::ASTCallbackVH::operator=(Value *V) {
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return *this = ASTCallbackVH(V, AST);
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}
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2009-06-02 17:52:33 +00:00
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//===----------------------------------------------------------------------===//
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// AliasSetPrinter Pass
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//===----------------------------------------------------------------------===//
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namespace {
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2009-11-04 14:58:56 +00:00
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class AliasSetPrinter : public FunctionPass {
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2009-06-02 17:52:33 +00:00
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AliasSetTracker *Tracker;
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public:
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static char ID; // Pass identification, replacement for typeid
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2011-02-20 12:57:14 +00:00
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AliasSetPrinter() : FunctionPass(ID) {
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initializeAliasSetPrinterPass(*PassRegistry::getPassRegistry());
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}
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2009-06-02 17:52:33 +00:00
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2014-11-24 09:08:18 +00:00
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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2009-06-02 17:52:33 +00:00
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AU.setPreservesAll();
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AU.addRequired<AliasAnalysis>();
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}
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2014-11-24 09:08:18 +00:00
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bool runOnFunction(Function &F) override {
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2009-06-02 17:52:33 +00:00
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Tracker = new AliasSetTracker(getAnalysis<AliasAnalysis>());
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for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I)
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Tracker->add(&*I);
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2009-10-14 17:57:32 +00:00
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Tracker->print(errs());
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2009-06-02 17:52:33 +00:00
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delete Tracker;
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return false;
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}
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};
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}
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char AliasSetPrinter::ID = 0;
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2011-02-20 12:57:14 +00:00
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INITIALIZE_PASS_BEGIN(AliasSetPrinter, "print-alias-sets",
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"Alias Set Printer", false, true)
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INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
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INITIALIZE_PASS_END(AliasSetPrinter, "print-alias-sets",
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"Alias Set Printer", false, true)
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