//
//===----------------------------------------------------------------------===//
-#ifndef LLVM_ANALYSIS_ALIAS_ANALYSIS_H
-#define LLVM_ANALYSIS_ALIAS_ANALYSIS_H
+#ifndef LLVM_ANALYSIS_ALIASANALYSIS_H
+#define LLVM_ANALYSIS_ALIASANALYSIS_H
#include "llvm/ADT/DenseMap.h"
-#include "llvm/Support/CallSite.h"
+#include "llvm/IR/CallSite.h"
+#include "llvm/IR/Metadata.h"
namespace llvm {
class AliasAnalysis {
protected:
- const DataLayout *TD;
+ const DataLayout *DL;
const TargetLibraryInfo *TLI;
private:
public:
static char ID; // Class identification, replacement for typeinfo
- AliasAnalysis() : TD(0), TLI(0), AA(0) {}
+ AliasAnalysis() : DL(nullptr), TLI(nullptr), AA(nullptr) {}
virtual ~AliasAnalysis(); // We want to be subclassed
/// UnknownSize - This is a special value which can be used with the
/// getDataLayout - Return a pointer to the current DataLayout object, or
/// null if no DataLayout object is available.
///
- const DataLayout *getDataLayout() const { return TD; }
+ const DataLayout *getDataLayout() const { return DL; }
/// getTargetLibraryInfo - Return a pointer to the current TargetLibraryInfo
/// object, or null if no TargetLibraryInfo object is available.
/// there are restrictions on stepping out of one object and into another.
/// See http://llvm.org/docs/LangRef.html#pointeraliasing
uint64_t Size;
- /// TBAATag - The metadata node which describes the TBAA type of
- /// the location, or null if there is no known unique tag.
- const MDNode *TBAATag;
+ /// AATags - The metadata nodes which describes the aliasing of the
+ /// location (each member is null if that kind of information is
+ /// unavailable)..
+ AAMDNodes AATags;
- explicit Location(const Value *P = 0, uint64_t S = UnknownSize,
- const MDNode *N = 0)
- : Ptr(P), Size(S), TBAATag(N) {}
+ explicit Location(const Value *P = nullptr, uint64_t S = UnknownSize,
+ const AAMDNodes &N = AAMDNodes())
+ : Ptr(P), Size(S), AATags(N) {}
Location getWithNewPtr(const Value *NewPtr) const {
Location Copy(*this);
return Copy;
}
- Location getWithoutTBAATag() const {
+ Location getWithoutAATags() const {
Location Copy(*this);
- Copy.TBAATag = 0;
+ Copy.AATags = AAMDNodes();
return Copy;
}
};
UnknownModRefBehavior = Anywhere | ModRef
};
+ /// Get the location associated with a pointer argument of a callsite.
+ /// The mask bits are set to indicate the allowed aliasing ModRef kinds.
+ /// Note that these mask bits do not necessarily account for the overall
+ /// behavior of the function, but rather only provide additional
+ /// per-argument information.
+ virtual Location getArgLocation(ImmutableCallSite CS, unsigned ArgIdx,
+ ModRefResult &Mask);
+
/// getModRefBehavior - Return the behavior when calling the given call site.
virtual ModRefBehavior getModRefBehavior(ImmutableCallSite CS);
///
/// canBasicBlockModify - Return true if it is possible for execution of the
- /// specified basic block to modify the value pointed to by Ptr.
+ /// specified basic block to modify the location Loc.
bool canBasicBlockModify(const BasicBlock &BB, const Location &Loc);
/// canBasicBlockModify - A convenience wrapper.
return canBasicBlockModify(BB, Location(P, Size));
}
- /// canInstructionRangeModify - Return true if it is possible for the
- /// execution of the specified instructions to modify the value pointed to by
- /// Ptr. The instructions to consider are all of the instructions in the
- /// range of [I1,I2] INCLUSIVE. I1 and I2 must be in the same basic block.
- bool canInstructionRangeModify(const Instruction &I1, const Instruction &I2,
- const Location &Loc);
+ /// canInstructionRangeModRef - Return true if it is possible for the
+ /// execution of the specified instructions to mod\ref (according to the
+ /// mode) the location Loc. The instructions to consider are all
+ /// of the instructions in the range of [I1,I2] INCLUSIVE.
+ /// I1 and I2 must be in the same basic block.
+ bool canInstructionRangeModRef(const Instruction &I1,
+ const Instruction &I2, const Location &Loc,
+ const ModRefResult Mode);
- /// canInstructionRangeModify - A convenience wrapper.
- bool canInstructionRangeModify(const Instruction &I1, const Instruction &I2,
- const Value *Ptr, uint64_t Size) {
- return canInstructionRangeModify(I1, I2, Location(Ptr, Size));
+ /// canInstructionRangeModRef - A convenience wrapper.
+ bool canInstructionRangeModRef(const Instruction &I1,
+ const Instruction &I2, const Value *Ptr,
+ uint64_t Size, const ModRefResult Mode) {
+ return canInstructionRangeModRef(I1, I2, Location(Ptr, Size), Mode);
}
//===--------------------------------------------------------------------===//
template<>
struct DenseMapInfo<AliasAnalysis::Location> {
static inline AliasAnalysis::Location getEmptyKey() {
- return
- AliasAnalysis::Location(DenseMapInfo<const Value *>::getEmptyKey(),
- 0, 0);
+ return AliasAnalysis::Location(DenseMapInfo<const Value *>::getEmptyKey(),
+ 0);
}
static inline AliasAnalysis::Location getTombstoneKey() {
- return
- AliasAnalysis::Location(DenseMapInfo<const Value *>::getTombstoneKey(),
- 0, 0);
+ return AliasAnalysis::Location(
+ DenseMapInfo<const Value *>::getTombstoneKey(), 0);
}
static unsigned getHashValue(const AliasAnalysis::Location &Val) {
return DenseMapInfo<const Value *>::getHashValue(Val.Ptr) ^
DenseMapInfo<uint64_t>::getHashValue(Val.Size) ^
- DenseMapInfo<const MDNode *>::getHashValue(Val.TBAATag);
+ DenseMapInfo<AAMDNodes>::getHashValue(Val.AATags);
}
static bool isEqual(const AliasAnalysis::Location &LHS,
const AliasAnalysis::Location &RHS) {
return LHS.Ptr == RHS.Ptr &&
LHS.Size == RHS.Size &&
- LHS.TBAATag == RHS.TBAATag;
+ LHS.AATags == RHS.AATags;
}
};
/// function.
bool isNoAliasCall(const Value *V);
+/// isNoAliasArgument - Return true if this is an argument with the noalias
+/// attribute.
+bool isNoAliasArgument(const Value *V);
+
/// isIdentifiedObject - Return true if this pointer refers to a distinct and
/// identifiable object. This returns true for:
/// Global Variables and Functions (but not Global Aliases)
///
bool isIdentifiedObject(const Value *V);
-/// isKnownNonNull - Return true if this pointer couldn't possibly be null by
-/// its definition. This returns true for allocas, non-extern-weak globals and
-/// byval arguments.
-bool isKnownNonNull(const Value *V);
+/// isIdentifiedFunctionLocal - Return true if V is umabigously identified
+/// at the function-level. Different IdentifiedFunctionLocals can't alias.
+/// Further, an IdentifiedFunctionLocal can not alias with any function
+/// arguments other than itself, which is not necessarily true for
+/// IdentifiedObjects.
+bool isIdentifiedFunctionLocal(const Value *V);
} // End llvm namespace
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