mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-10-20 09:24:58 +00:00
This is a substantial rewrite of the AliasSetTracker class which now uses
a union-find based algorithm, is significantly faster, and is more general. It will also scale to handle call instructions correctly, which is a nice added bonus. This includes a new pass -print-alias-sets which can be used to show how alias sets are formed for a particular analysis. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5619 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
93a7e08d1f
commit
9971ac4a36
@ -10,80 +10,194 @@
|
||||
#ifndef LLVM_ANALYSIS_ALIASSETTRACKER_H
|
||||
#define LLVM_ANALYSIS_ALIASSETTRACKER_H
|
||||
|
||||
#include <vector>
|
||||
#include "llvm/Support/CallSite.h"
|
||||
#include "Support/iterator"
|
||||
#include "Support/hash_map"
|
||||
#include "Support/ilist"
|
||||
class AliasAnalysis;
|
||||
class LoadInst;
|
||||
class StoreInst;
|
||||
class CallInst;
|
||||
class InvokeInst;
|
||||
class Value;
|
||||
class AliasSetTracker;
|
||||
class AliasSet;
|
||||
|
||||
class AliasSet {
|
||||
friend class AliasSetTracker;
|
||||
std::vector<LoadInst*> Loads;
|
||||
std::vector<StoreInst*> Stores;
|
||||
std::vector<CallInst*> Calls;
|
||||
std::vector<InvokeInst*> Invokes;
|
||||
public:
|
||||
|
||||
struct PointerRec;
|
||||
typedef std::pair<Value* const, PointerRec> HashNodePair;
|
||||
|
||||
class PointerRec {
|
||||
HashNodePair *NextInList;
|
||||
AliasSet *AS;
|
||||
public:
|
||||
PointerRec() : NextInList(0), AS(0) {}
|
||||
|
||||
HashNodePair *getNext() const { return NextInList; }
|
||||
bool hasAliasSet() const { return AS != 0; }
|
||||
|
||||
AliasSet *getAliasSet(AliasSetTracker &AST) {
|
||||
assert(AS && "No AliasSet yet!");
|
||||
if (AS->Forward) {
|
||||
AliasSet *OldAS = AS;
|
||||
AS = OldAS->getForwardedTarget(AST);
|
||||
if (--OldAS->RefCount == 0)
|
||||
OldAS->removeFromTracker(AST);
|
||||
AS->RefCount++;
|
||||
}
|
||||
return AS;
|
||||
}
|
||||
|
||||
void setAliasSet(AliasSet *as) {
|
||||
assert(AS == 0 && "Already have an alias set!");
|
||||
AS = as;
|
||||
}
|
||||
void setTail(HashNodePair *T) {
|
||||
assert(NextInList == 0 && "Already have tail!");
|
||||
NextInList = T;
|
||||
}
|
||||
};
|
||||
|
||||
HashNodePair *PtrListHead, *PtrListTail; // Singly linked list of nodes
|
||||
AliasSet *Forward; // Forwarding pointer
|
||||
AliasSet *Next, *Prev; // Doubly linked list of AliasSets
|
||||
|
||||
std::vector<CallSite> CallSites; // All calls & invokes in this node
|
||||
|
||||
// RefCount - Number of nodes pointing to this AliasSet plus the number of
|
||||
// AliasSets forwarding to it.
|
||||
unsigned RefCount : 29;
|
||||
|
||||
/// AccessType - Keep track of whether this alias set merely refers to the
|
||||
/// locations of memory, whether it modifies the memory, or whether it does
|
||||
/// both. The lattice goes from "None" (alias set not present) to either Refs
|
||||
/// or Mods, then to ModRef as neccesary.
|
||||
/// both. The lattice goes from "NoModRef" to either Refs or Mods, then to
|
||||
/// ModRef as neccesary.
|
||||
///
|
||||
enum AccessType {
|
||||
Refs, Mods, ModRef
|
||||
NoModRef = 0, Refs = 1, // Ref = bit 1
|
||||
Mods = 2, ModRef = 3 // Mod = bit 2
|
||||
};
|
||||
unsigned AccessTy : 2;
|
||||
|
||||
/// AliasType - Keep track the relationships between the pointers in the set.
|
||||
/// Lattice goes from MustAlias to MayAlias.
|
||||
///
|
||||
enum AliasType {
|
||||
MustAlias, MayAlias
|
||||
MustAlias = 0, MayAlias = 1
|
||||
};
|
||||
private:
|
||||
enum AccessType AccessTy;
|
||||
enum AliasType AliasTy;
|
||||
unsigned AliasTy : 1;
|
||||
|
||||
/// Define an iterator for alias sets... this is just a forward iterator.
|
||||
class iterator : public forward_iterator<Value*, ptrdiff_t> {
|
||||
HashNodePair *CurNode;
|
||||
public:
|
||||
iterator(HashNodePair *CN = 0) : CurNode(CN) {}
|
||||
|
||||
bool operator==(const iterator& x) const {
|
||||
return CurNode == x.CurNode;
|
||||
}
|
||||
bool operator!=(const iterator& x) const { return !operator==(x); }
|
||||
|
||||
const iterator &operator=(const iterator &I) {
|
||||
CurNode = I.CurNode;
|
||||
return *this;
|
||||
}
|
||||
|
||||
value_type operator*() const {
|
||||
assert(CurNode && "Dereferencing AliasSet.end()!");
|
||||
return CurNode->first;
|
||||
}
|
||||
value_type operator->() const { return operator*(); }
|
||||
|
||||
iterator& operator++() { // Preincrement
|
||||
assert(CurNode && "Advancing past AliasSet.end()!");
|
||||
CurNode = CurNode->second.getNext();
|
||||
return *this;
|
||||
}
|
||||
iterator operator++(int) { // Postincrement
|
||||
iterator tmp = *this; ++*this; return tmp;
|
||||
}
|
||||
};
|
||||
|
||||
friend class ilist_traits<AliasSet>;
|
||||
AliasSet *getPrev() const { return Prev; }
|
||||
AliasSet *getNext() const { return Next; }
|
||||
void setPrev(AliasSet *P) { Prev = P; }
|
||||
void setNext(AliasSet *N) { Next = N; }
|
||||
|
||||
public:
|
||||
/// Accessors...
|
||||
enum AccessType getAccessType() const { return AccessTy; }
|
||||
enum AliasType getAliasType() const { return AliasTy; }
|
||||
|
||||
// TODO: in the future, add a fixed size (4? 2?) cache of pointers that we
|
||||
// know are in the alias set, to cut down time answering "pointeraliasesset"
|
||||
// queries.
|
||||
|
||||
/// pointerAliasesSet - Return true if the specified pointer "may" (or must)
|
||||
/// alias one of the members in the set.
|
||||
///
|
||||
bool pointerAliasesSet(const Value *Ptr, AliasAnalysis &AA) const;
|
||||
bool isRef() const { return AccessTy & Refs; }
|
||||
bool isMod() const { return AccessTy & Mods; }
|
||||
bool isMustAlias() const { return AliasTy == MustAlias; }
|
||||
bool isMayAlias() const { return AliasTy == MayAlias; }
|
||||
|
||||
/// mergeSetIn - Merge the specified alias set into this alias set...
|
||||
///
|
||||
void mergeSetIn(const AliasSet &AS);
|
||||
void mergeSetIn(AliasSet &AS);
|
||||
|
||||
const std::vector<LoadInst*> &getLoads() const { return Loads; }
|
||||
const std::vector<StoreInst*> &getStores() const { return Stores; }
|
||||
const std::vector<CallInst*> &getCalls() const { return Calls; }
|
||||
const std::vector<InvokeInst*> &getInvokes() const { return Invokes; }
|
||||
// Alias Set iteration - Allow access to all of the pointer which are part of
|
||||
// this alias set...
|
||||
iterator begin() const { return iterator(PtrListHead); }
|
||||
iterator end() const { return iterator(); }
|
||||
|
||||
void print(std::ostream &OS) const;
|
||||
void dump() const;
|
||||
|
||||
private:
|
||||
AliasSet() : AliasTy(MustAlias) {} // Can only be created by AliasSetTracker
|
||||
void updateAccessType();
|
||||
Value *getSomePointer() const;
|
||||
// Can only be created by AliasSetTracker
|
||||
AliasSet() : PtrListHead(0), PtrListTail(0), Forward(0), RefCount(0),
|
||||
AccessTy(NoModRef), AliasTy(MustAlias) {
|
||||
}
|
||||
Value *getSomePointer() const {
|
||||
return PtrListHead ? PtrListHead->first : 0;
|
||||
}
|
||||
|
||||
/// getForwardedTarget - Return the real alias set this represents. If this
|
||||
/// has been merged with another set and is forwarding, return the ultimate
|
||||
/// destination set. This also implements the union-find collapsing as well.
|
||||
AliasSet *getForwardedTarget(AliasSetTracker &AST) {
|
||||
if (!Forward) return this;
|
||||
|
||||
AliasSet *Dest = Forward->getForwardedTarget(AST);
|
||||
if (Dest != Forward) {
|
||||
Dest->RefCount++;
|
||||
if (--Forward->RefCount == 0)
|
||||
Forward->removeFromTracker(AST);
|
||||
Forward = Dest;
|
||||
}
|
||||
return Dest;
|
||||
}
|
||||
|
||||
void removeFromTracker(AliasSetTracker &AST);
|
||||
|
||||
void addPointer(AliasSetTracker &AST, HashNodePair &Entry);
|
||||
void addCallSite(CallSite CS);
|
||||
|
||||
/// aliasesPointer - Return true if the specified pointer "may" (or must)
|
||||
/// alias one of the members in the set.
|
||||
///
|
||||
bool aliasesPointer(const Value *Ptr, AliasAnalysis &AA) const;
|
||||
bool aliasesCallSite(CallSite CS, AliasAnalysis &AA) const;
|
||||
};
|
||||
|
||||
inline std::ostream& operator<<(std::ostream &OS, const AliasSet &AS) {
|
||||
AS.print(OS);
|
||||
return OS;
|
||||
}
|
||||
|
||||
|
||||
class AliasSetTracker {
|
||||
AliasAnalysis &AA;
|
||||
std::vector<AliasSet> AliasSets;
|
||||
ilist<AliasSet> AliasSets;
|
||||
|
||||
// Map from pointers to their node
|
||||
hash_map<Value*, AliasSet::PointerRec> PointerMap;
|
||||
public:
|
||||
/// AliasSetTracker ctor - Create an empty collection of AliasSets, and use
|
||||
/// the specified alias analysis object to disambiguate load and store
|
||||
/// addresses.
|
||||
AliasSetTracker(AliasAnalysis &aa) : AA(aa) {}
|
||||
|
||||
|
||||
/// add methods - These methods are used to add different types of
|
||||
/// instructions to the alias sets. Adding a new instruction can result in
|
||||
/// one of three actions happening:
|
||||
@ -95,15 +209,57 @@ public:
|
||||
///
|
||||
void add(LoadInst *LI);
|
||||
void add(StoreInst *SI);
|
||||
void add(CallInst *CI);
|
||||
void add(InvokeInst *II);
|
||||
void add(CallSite CS); // Call/Invoke instructions
|
||||
void add(CallInst *CI) { add(CallSite(CI)); }
|
||||
void add(InvokeInst *II) { add(CallSite(II)); }
|
||||
void add(Instruction *I); // Dispatch to one of the other add methods...
|
||||
|
||||
/// getAliasSets - Return the alias sets that are active.
|
||||
const std::vector<AliasSet> &getAliasSets() const { return AliasSets; }
|
||||
const ilist<AliasSet> &getAliasSets() const { return AliasSets; }
|
||||
|
||||
/// getAliasSetForPointer - Return the alias set that the specified pointer
|
||||
/// lives in...
|
||||
AliasSet &getAliasSetForPointer(Value *P);
|
||||
|
||||
/// getAliasAnalysis - Return the underlying alias analysis object used by
|
||||
/// this tracker.
|
||||
AliasAnalysis &getAliasAnalysis() const { return AA; }
|
||||
|
||||
typedef ilist<AliasSet>::iterator iterator;
|
||||
typedef ilist<AliasSet>::const_iterator const_iterator;
|
||||
|
||||
const_iterator begin() const { return AliasSets.begin(); }
|
||||
const_iterator end() const { return AliasSets.end(); }
|
||||
|
||||
iterator begin() { return AliasSets.begin(); }
|
||||
iterator end() { return AliasSets.end(); }
|
||||
|
||||
void print(std::ostream &OS) const;
|
||||
void dump() const;
|
||||
|
||||
private:
|
||||
friend class AliasSet;
|
||||
void removeAliasSet(AliasSet *AS);
|
||||
|
||||
AliasSet::HashNodePair &getEntryFor(Value *V) {
|
||||
// Standard operator[], except that it returns the whole pair, not just
|
||||
// ->second.
|
||||
return *PointerMap.insert(AliasSet::HashNodePair(V,
|
||||
AliasSet::PointerRec())).first;
|
||||
}
|
||||
|
||||
void addPointer(Value *P, AliasSet::AccessType E) {
|
||||
AliasSet &AS = getAliasSetForPointer(P);
|
||||
AS.AccessTy |= E;
|
||||
}
|
||||
AliasSet *findAliasSetForPointer(const Value *Ptr);
|
||||
void mergeAllSets();
|
||||
|
||||
AliasSet *findAliasSetForCallSite(CallSite CS);
|
||||
};
|
||||
|
||||
inline std::ostream& operator<<(std::ostream &OS, const AliasSetTracker &AST) {
|
||||
AST.print(OS);
|
||||
return OS;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
@ -9,164 +9,271 @@
|
||||
#include "llvm/iMemory.h"
|
||||
#include "llvm/iOther.h"
|
||||
#include "llvm/iTerminators.h"
|
||||
|
||||
/// updateAccessTypes - Depending on what type of accesses are in this set,
|
||||
/// decide whether the set contains just references, just modifications, or a
|
||||
/// mix.
|
||||
///
|
||||
void AliasSet::updateAccessType() {
|
||||
if (!Calls.empty() || !Invokes.empty()) {
|
||||
AccessTy = ModRef;
|
||||
} else if (!Loads.empty()) {
|
||||
if (Stores.empty())
|
||||
AccessTy = Refs;
|
||||
else
|
||||
AccessTy = ModRef;
|
||||
} else {
|
||||
AccessTy = Mods;
|
||||
}
|
||||
}
|
||||
#include "llvm/Pass.h"
|
||||
#include "llvm/Assembly/Writer.h"
|
||||
#include "llvm/Support/InstIterator.h"
|
||||
|
||||
/// mergeSetIn - Merge the specified alias set into this alias set...
|
||||
///
|
||||
void AliasSet::mergeSetIn(const AliasSet &AS) {
|
||||
// Merge instruction sets...
|
||||
Loads.insert( Loads.end(), AS.Loads.begin() , AS.Loads.end());
|
||||
Stores.insert( Stores.end(), AS.Stores.begin() , AS.Stores.end());
|
||||
Calls.insert( Calls.end(), AS.Calls.begin() , AS.Calls.end());
|
||||
Invokes.insert(Invokes.end(), AS.Invokes.begin(), AS.Invokes.end());
|
||||
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...
|
||||
if (AS.getAliasType() == MayAlias)
|
||||
AliasTy = MayAlias;
|
||||
updateAccessType();
|
||||
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...
|
||||
PtrListTail->second.setTail(AS.PtrListHead);
|
||||
PtrListTail = AS.PtrListTail;
|
||||
AS.PtrListHead = AS.PtrListTail = 0;
|
||||
}
|
||||
|
||||
/// pointerAliasesSet - Return true if the specified pointer "may" (or must)
|
||||
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){
|
||||
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 (Value *V = getSomePointer())
|
||||
if (AA.alias(V, Entry.first) == AliasAnalysis::MayAlias)
|
||||
AliasTy = MayAlias;
|
||||
|
||||
Entry.second.setAliasSet(this);
|
||||
|
||||
// Add it to the end of the list...
|
||||
if (PtrListTail)
|
||||
PtrListTail->second.setTail(&Entry);
|
||||
else
|
||||
PtrListHead = &Entry;
|
||||
PtrListTail = &Entry;
|
||||
RefCount++; // Entry points to alias set...
|
||||
}
|
||||
|
||||
void AliasSet::addCallSite(CallSite CS) {
|
||||
CallSites.push_back(CS);
|
||||
AliasTy = MayAlias; // FIXME: Too conservative
|
||||
}
|
||||
|
||||
/// aliasesPointer - Return true if the specified pointer "may" (or must)
|
||||
/// alias one of the members in the set.
|
||||
///
|
||||
bool AliasSet::pointerAliasesSet(const Value *Ptr, AliasAnalysis &AA) const {
|
||||
if (!Calls.empty() || !Invokes.empty())
|
||||
bool AliasSet::aliasesPointer(const Value *Ptr, 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...
|
||||
Value *SomePtr = getSomePointer();
|
||||
assert(SomePtr && "Empty must-alias set??");
|
||||
return AA.alias(SomePtr, Ptr);
|
||||
}
|
||||
|
||||
// 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, *I))
|
||||
return true;
|
||||
|
||||
// Check the call sites list and invoke list...
|
||||
if (!CallSites.empty())
|
||||
// FIXME: this is pessimistic!
|
||||
return true;
|
||||
for (unsigned i = 0, e = Loads.size(); i != e; ++i)
|
||||
if (AA.alias(Ptr, Loads[i]->getOperand(0)))
|
||||
return true;
|
||||
for (unsigned i = 0, e = Stores.size(); i != e; ++i)
|
||||
if (AA.alias(Ptr, Stores[i]->getOperand(1)))
|
||||
return true;
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
/// getSomePointer - This method may only be called when the AliasType of the
|
||||
/// set is MustAlias. This is used to return any old pointer (which must alias
|
||||
/// all other pointers in the set) so that the caller can decide whether to turn
|
||||
/// this set into a may alias set or not.
|
||||
///
|
||||
Value *AliasSet::getSomePointer() const {
|
||||
assert(getAliasType() == MustAlias &&
|
||||
"Cannot call getSomePointer on a 'MayAlias' set!");
|
||||
assert(Calls.empty() && Invokes.empty() && "Call/invokes mean may alias!");
|
||||
|
||||
if (!Loads.empty())
|
||||
return Loads[0]->getOperand(0);
|
||||
assert(!Stores.empty() && "There are no instructions in this set!");
|
||||
return Stores[0]->getOperand(1);
|
||||
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) {
|
||||
AliasSet *FoundSet = 0;
|
||||
for (unsigned i = 0; i != AliasSets.size(); ++i) {
|
||||
if (AliasSets[i].pointerAliasesSet(Ptr, AA)) {
|
||||
for (iterator I = begin(), E = end(); I != E; ++I)
|
||||
if (I->aliasesPointer(Ptr, AA)) {
|
||||
if (FoundSet == 0) { // If this is the first alias set ptr can go into...
|
||||
FoundSet = &AliasSets[i]; // Remember it.
|
||||
FoundSet = I; // Remember it.
|
||||
} else { // Otherwise, we must merge the sets...
|
||||
FoundSet->mergeSetIn(AliasSets[i]); // Merge in contents...
|
||||
AliasSets.erase(AliasSets.begin()+i); // Remove the set...
|
||||
--i; // Don't skip the next set
|
||||
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->aliasesCallSite(CS, 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;
|
||||
}
|
||||
|
||||
|
||||
void AliasSetTracker::add(LoadInst *LI) {
|
||||
Value *Pointer = LI->getOperand(0);
|
||||
|
||||
// Check to see if the loaded pointer aliases any sets...
|
||||
AliasSet *AS = findAliasSetForPointer(Pointer);
|
||||
if (AS) {
|
||||
AS->Loads.push_back(LI);
|
||||
// Check to see if we need to change this into a MayAlias set now...
|
||||
if (AS->getAliasType() == AliasSet::MustAlias)
|
||||
if (AA.alias(AS->getSomePointer(), Pointer) != AliasAnalysis::MustAlias)
|
||||
AS->AliasTy = AliasSet::MayAlias;
|
||||
AS->updateAccessType();
|
||||
|
||||
/// getAliasSetForPointer - Return the alias set that the specified pointer
|
||||
/// lives in...
|
||||
AliasSet &AliasSetTracker::getAliasSetForPointer(Value *Pointer) {
|
||||
AliasSet::HashNodePair &Entry = getEntryFor(Pointer);
|
||||
|
||||
// Check to see if the pointer is already known...
|
||||
if (Entry.second.hasAliasSet()) {
|
||||
// Return the set!
|
||||
return *Entry.second.getAliasSet(*this)->getForwardedTarget(*this);
|
||||
} else if (AliasSet *AS = findAliasSetForPointer(Pointer)) {
|
||||
// Add it to the alias set it aliases...
|
||||
AS->addPointer(*this, Entry);
|
||||
return *AS;
|
||||
} else {
|
||||
// Otherwise create a new alias set to hold the load...
|
||||
// Otherwise create a new alias set to hold the loaded pointer...
|
||||
AliasSets.push_back(AliasSet());
|
||||
AliasSets.back().Loads.push_back(LI);
|
||||
AliasSets.back().AccessTy = AliasSet::Refs;
|
||||
AliasSets.back().addPointer(*this, Entry);
|
||||
return AliasSets.back();
|
||||
}
|
||||
}
|
||||
|
||||
void AliasSetTracker::add(LoadInst *LI) {
|
||||
addPointer(LI->getOperand(0), AliasSet::Refs);
|
||||
}
|
||||
|
||||
void AliasSetTracker::add(StoreInst *SI) {
|
||||
Value *Pointer = SI->getOperand(1);
|
||||
addPointer(SI->getOperand(1), AliasSet::Mods);
|
||||
}
|
||||
|
||||
// Check to see if the loaded pointer aliases any sets...
|
||||
AliasSet *AS = findAliasSetForPointer(Pointer);
|
||||
if (AS) {
|
||||
AS->Stores.push_back(SI);
|
||||
// Check to see if we need to change this into a MayAlias set now...
|
||||
if (AS->getAliasType() == AliasSet::MustAlias)
|
||||
if (AA.alias(AS->getSomePointer(), Pointer) != AliasAnalysis::MustAlias)
|
||||
AS->AliasTy = AliasSet::MayAlias;
|
||||
AS->updateAccessType();
|
||||
} else {
|
||||
// Otherwise create a new alias set to hold the load...
|
||||
void AliasSetTracker::add(CallSite CS) {
|
||||
AliasSet *AS = findAliasSetForCallSite(CS);
|
||||
if (!AS) {
|
||||
AliasSets.push_back(AliasSet());
|
||||
AliasSets.back().Stores.push_back(SI);
|
||||
AliasSets.back().AccessTy = AliasSet::Mods;
|
||||
AS = &AliasSets.back();
|
||||
}
|
||||
AS->addCallSite(CS);
|
||||
}
|
||||
|
||||
|
||||
void AliasSetTracker::mergeAllSets() {
|
||||
if (AliasSets.size() < 2) return; // Noop
|
||||
|
||||
// Merge all of the sets into set #0
|
||||
for (unsigned i = 1, e = AliasSets.size(); i != e; ++i)
|
||||
AliasSets[0].mergeSetIn(AliasSets[i]);
|
||||
|
||||
// Delete extraneous sets...
|
||||
AliasSets.erase(AliasSets.begin()+1, AliasSets.end());
|
||||
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(CallInst *CI) {
|
||||
if (!AliasSets.empty()) {
|
||||
mergeAllSets();
|
||||
} else {
|
||||
AliasSets.push_back(AliasSet());
|
||||
//===----------------------------------------------------------------------===//
|
||||
// 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!");
|
||||
}
|
||||
AliasSets[0].AccessTy = AliasSet::ModRef;
|
||||
AliasSets[0].AliasTy = AliasSet::MayAlias;
|
||||
AliasSets[0].Calls.push_back(CI);
|
||||
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);
|
||||
}
|
||||
}
|
||||
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::add(InvokeInst *II) {
|
||||
if (!AliasSets.empty()) {
|
||||
mergeAllSets();
|
||||
} else {
|
||||
AliasSets.push_back(AliasSet());
|
||||
}
|
||||
AliasSets[0].AccessTy = AliasSet::ModRef;
|
||||
AliasSets[0].AliasTy = AliasSet::MayAlias;
|
||||
AliasSets[0].Invokes.push_back(II);
|
||||
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);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user