#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/ilist.h"
#include "llvm/ADT/ilist_node.h"
+#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/ValueHandle.h"
#include <vector>
namespace llvm {
-class AliasAnalysis;
class LoadInst;
class StoreInst;
class VAArgInst;
AliasSet *AS;
uint64_t Size;
AAMDNodes AAInfo;
+
public:
PointerRec(Value *V)
: Val(V), PrevInList(nullptr), NextInList(nullptr), AS(nullptr), Size(0),
AAInfo(DenseMapInfo<AAMDNodes>::getEmptyKey()) {}
Value *getValue() const { return Val; }
-
+
PointerRec *getNext() const { return NextInList; }
bool hasAliasSet() const { return AS != nullptr; }
// AliasSets forwarding to it.
unsigned RefCount : 28;
- /// 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 "NoModRef" to either Refs or Mods, then to
- /// ModRef as necessary.
+ /// The kinds of access this alias set models.
///
- enum AccessType {
- NoModRef = 0, Refs = 1, // Ref = bit 1
- Mods = 2, ModRef = 3 // Mod = bit 2
+ /// We keep track of whether this alias set merely refers to the locations of
+ /// memory (and not any particular access), whether it modifies or references
+ /// the memory, or whether it does both. The lattice goes from "NoAccess" to
+ /// either RefAccess or ModAccess, then to ModRefAccess as necessary.
+ enum AccessLattice {
+ NoAccess = 0,
+ RefAccess = 1,
+ ModAccess = 2,
+ ModRefAccess = RefAccess | ModAccess
};
- unsigned AccessTy : 2;
+ unsigned Access : 2;
- /// AliasType - Keep track the relationships between the pointers in the set.
- /// Lattice goes from MustAlias to MayAlias.
+ /// The kind of alias relationship between pointers of the set.
///
- enum AliasType {
- MustAlias = 0, MayAlias = 1
+ /// These represent conservatively correct alias results between any members
+ /// of the set. We represent these independently of the values of alias
+ /// results in order to pack it into a single bit. Lattice goes from
+ /// MustAlias to MayAlias.
+ enum AliasLattice {
+ SetMustAlias = 0, SetMayAlias = 1
};
- unsigned AliasTy : 1;
+ unsigned Alias : 1;
// Volatile - True if this alias set contains volatile loads or stores.
bool Volatile : 1;
assert(i < UnknownInsts.size());
return UnknownInsts[i];
}
-
+
public:
/// Accessors...
- bool isRef() const { return AccessTy & Refs; }
- bool isMod() const { return AccessTy & Mods; }
- bool isMustAlias() const { return AliasTy == MustAlias; }
- bool isMayAlias() const { return AliasTy == MayAlias; }
+ bool isRef() const { return Access & RefAccess; }
+ bool isMod() const { return Access & ModAccess; }
+ bool isMustAlias() const { return Alias == SetMustAlias; }
+ bool isMayAlias() const { return Alias == SetMayAlias; }
// isVolatile - Return true if this alias set contains volatile loads or
// stores.
class iterator : public std::iterator<std::forward_iterator_tag,
PointerRec, ptrdiff_t> {
PointerRec *CurNode;
+
public:
explicit iterator(PointerRec *CN = nullptr) : CurNode(CN) {}
friend struct ilist_sentinel_traits<AliasSet>;
AliasSet()
: PtrList(nullptr), PtrListEnd(&PtrList), Forward(nullptr), RefCount(0),
- AccessTy(NoModRef), AliasTy(MustAlias), Volatile(false) {
+ Access(NoAccess), Alias(SetMustAlias), Volatile(false) {
}
AliasSet(const AliasSet &AS) = delete;
return OS;
}
-
class AliasSetTracker {
/// CallbackVH - A CallbackVH to arrange for AliasSetTracker to be
/// notified whenever a Value is deleted.
- class ASTCallbackVH : public CallbackVH {
+ class ASTCallbackVH final : public CallbackVH {
AliasSetTracker *AST;
void deleted() override;
void allUsesReplacedWith(Value *) override;
+
public:
ASTCallbackVH(Value *V, AliasSetTracker *AST = nullptr);
ASTCallbackVH &operator=(Value *V);
bool remove(Instruction *I);
void remove(AliasSet &AS);
bool removeUnknown(Instruction *I);
-
+
void clear();
/// getAliasSets - Return the alias sets that are active.
///
void copyValue(Value *From, Value *To);
-
typedef ilist<AliasSet>::iterator iterator;
typedef ilist<AliasSet>::const_iterator const_iterator;
}
AliasSet &addPointer(Value *P, uint64_t Size, const AAMDNodes &AAInfo,
- AliasSet::AccessType E,
+ AliasSet::AccessLattice E,
bool &NewSet) {
NewSet = false;
AliasSet &AS = getAliasSetForPointer(P, Size, AAInfo, &NewSet);
- AS.AccessTy |= E;
+ AS.Access |= E;
return AS;
}
AliasSet *findAliasSetForPointer(const Value *Ptr, uint64_t Size,
return OS;
}
-} // namespace llvm
+} // End llvm namespace
#endif