-static cl::opt<bool>
-EnableSelectionDAGSP("enable-selectiondag-sp", cl::init(true),
- cl::Hidden);
-
-namespace {
- class StackProtector : public FunctionPass {
- const TargetMachine *TM;
-
- /// TLI - Keep a pointer of a TargetLowering to consult for determining
- /// target type sizes.
- const TargetLoweringBase *TLI;
- const Triple Trip;
-
- Function *F;
- Module *M;
-
- DominatorTree *DT;
-
- /// \brief The minimum size of buffers that will receive stack smashing
- /// protection when -fstack-protection is used.
- unsigned SSPBufferSize;
-
- /// VisitedPHIs - The set of PHI nodes visited when determining
- /// if a variable's reference has been taken. This set
- /// is maintained to ensure we don't visit the same PHI node multiple
- /// times.
- SmallPtrSet<const PHINode*, 16> VisitedPHIs;
-
- /// InsertStackProtectors - Insert code into the prologue and epilogue of
- /// the function.
- ///
- /// - The prologue code loads and stores the stack guard onto the stack.
- /// - The epilogue checks the value stored in the prologue against the
- /// original value. It calls __stack_chk_fail if they differ.
- bool InsertStackProtectors();
-
- /// CreateFailBB - Create a basic block to jump to when the stack protector
- /// check fails.
- BasicBlock *CreateFailBB();
-
- /// ContainsProtectableArray - Check whether the type either is an array or
- /// contains an array of sufficient size so that we need stack protectors
- /// for it.
- bool ContainsProtectableArray(Type *Ty, bool Strong = false,
- bool InStruct = false) const;
-
- /// \brief Check whether a stack allocation has its address taken.
- bool HasAddressTaken(const Instruction *AI);
-
- /// RequiresStackProtector - Check whether or not this function needs a
- /// stack protector based upon the stack protector level.
- bool RequiresStackProtector();
- public:
- static char ID; // Pass identification, replacement for typeid.
- StackProtector() : FunctionPass(ID), TM(0), TLI(0), SSPBufferSize(0) {
- initializeStackProtectorPass(*PassRegistry::getPassRegistry());
- }
- StackProtector(const TargetMachine *TM)
- : FunctionPass(ID), TM(TM), TLI(0), Trip(TM->getTargetTriple()),
- SSPBufferSize(8) {
- initializeStackProtectorPass(*PassRegistry::getPassRegistry());
- }
-
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.addPreserved<DominatorTree>();
- }
-
- virtual bool runOnFunction(Function &Fn);
- };
-} // end anonymous namespace