[stackprotector] Refactor the StackProtector pass from a single .cpp file into StackProtector.h and StackProtector.cpp.

No functionality change.  Future patches will add analysis which will be used
in other passes (PEI, StackSlot).  The end goal is to support ssp-strong stack
layout rules.

WIP.

Differential Revision: http://llvm-reviews.chandlerc.com/D1521


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191570 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 70 deletions

diff --git a/lib/CodeGen/StackProtector.cpp b/lib/CodeGen/StackProtector.cpp
index f65b61720f..cb22082e4d 100644
--- a/lib/CodeGen/StackProtector.cpp
+++ b/lib/CodeGen/StackProtector.cpp
@@ -15,11 +15,11 @@
 //===----------------------------------------------------------------------===//
 
 #define DEBUG_TYPE "stack-protector"
+#include "llvm/CodeGen/StackProtector.h"
 #include "llvm/CodeGen/Analysis.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/Statistic.h"
-#include "llvm/ADT/Triple.h"
 #include "llvm/Analysis/Dominators.h"
 #include "llvm/Analysis/ValueTracking.h"
 #include "llvm/IR/Attributes.h"
@@ -34,9 +34,7 @@
 #include "llvm/IR/IntrinsicInst.h"
 #include "llvm/IR/Intrinsics.h"
 #include "llvm/IR/Module.h"
-#include "llvm/Pass.h"
 #include "llvm/Support/CommandLine.h"
-#include "llvm/Target/TargetLowering.h"
 #include <cstdlib>
 using namespace llvm;
 
@@ -48,73 +46,6 @@ 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
-
 char StackProtector::ID = 0;
 INITIALIZE_PASS(StackProtector, "stack-protector",
                 "Insert stack protectors", false, false)