if (Node->getNumOperands() < 2)
return TBAAStructTypeNode();
- // Special handling for a scalar type node.
+ // Fast path for a scalar type node and a struct type node with a single
+ // field.
if (Node->getNumOperands() <= 3) {
+ uint64_t Cur = Node->getNumOperands() == 2 ? 0 :
+ cast<ConstantInt>(Node->getOperand(2))->getZExtValue();
+ Offset -= Cur;
MDNode *P = dyn_cast_or_null<MDNode>(Node->getOperand(1));
if (!P)
return TBAAStructTypeNode();
initializeTypeBasedAliasAnalysisPass(*PassRegistry::getPassRegistry());
}
- virtual void initializePass() {
+ void initializePass() override {
InitializeAliasAnalysis(this);
}
/// an analysis interface through multiple inheritance. If needed, it
/// should override this to adjust the this pointer as needed for the
/// specified pass info.
- virtual void *getAdjustedAnalysisPointer(const void *PI) {
+ void *getAdjustedAnalysisPointer(const void *PI) override {
if (PI == &AliasAnalysis::ID)
return (AliasAnalysis*)this;
return this;
bool PathAliases(const MDNode *A, const MDNode *B) const;
private:
- virtual void getAnalysisUsage(AnalysisUsage &AU) const;
- virtual AliasResult alias(const Location &LocA, const Location &LocB);
- virtual bool pointsToConstantMemory(const Location &Loc, bool OrLocal);
- virtual ModRefBehavior getModRefBehavior(ImmutableCallSite CS);
- virtual ModRefBehavior getModRefBehavior(const Function *F);
- virtual ModRefResult getModRefInfo(ImmutableCallSite CS,
- const Location &Loc);
- virtual ModRefResult getModRefInfo(ImmutableCallSite CS1,
- ImmutableCallSite CS2);
+ void getAnalysisUsage(AnalysisUsage &AU) const override;
+ AliasResult alias(const Location &LocA, const Location &LocB) override;
+ bool pointsToConstantMemory(const Location &Loc, bool OrLocal) override;
+ ModRefBehavior getModRefBehavior(ImmutableCallSite CS) override;
+ ModRefBehavior getModRefBehavior(const Function *F) override;
+ ModRefResult getModRefInfo(ImmutableCallSite CS,
+ const Location &Loc) override;
+ ModRefResult getModRefInfo(ImmutableCallSite CS1,
+ ImmutableCallSite CS2) override;
};
} // End of anonymous namespace
/// it as struct-path aware TBAA format, otherwise, we treat it as scalar TBAA
/// format.
static bool isStructPathTBAA(const MDNode *MD) {
- return isa<MDNode>(MD->getOperand(0));
+ // Anonymous TBAA root starts with a MDNode and dragonegg uses it as
+ // a TBAA tag.
+ return isa<MDNode>(MD->getOperand(0)) && MD->getNumOperands() >= 3;
}
/// Aliases - Test whether the type represented by A may alias the