safecode/include/safecode/BreakConstantStrings.h

//===- BreakConstantStrings.h - Make global string constants non-constant - --//
// 
//                          The SAFECode Compiler 
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
// 
//===----------------------------------------------------------------------===//
//
// This pass changes all GEP constant expressions into GEP instructions.  This
// permits the rest of SAFECode to put run-time checks on them if necessary.
//
//===----------------------------------------------------------------------===//

#ifndef BREAKCONSTANTSTRINGS_H
#define BREAKCONSTANTSTRINGS_H

#include "llvm/Analysis/Dominators.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"

#include "safecode/SAFECode.h"

using namespace llvm;

NAMESPACE_SC_BEGIN

//
// Pass: BreakConstantStrings
//
// Description:
//  This pass modifies an LLVM Module so that strings are not constant.
//
struct BreakConstantStrings : public ModulePass {
  private:
    // Private methods

    // Private variables

  public:
    static char ID;
    BreakConstantStrings() : ModulePass((intptr_t)(&ID)) {}
    const char *getPassName() const {return "Make Global Strings Non-constant";}
    virtual bool runOnModule (Module & M);
    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
      // This pass does not modify the control-flow graph of the function
      AU.setPreservesCFG();
    }
};

NAMESPACE_SC_END

#endif