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VariableRotation.cpp
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VariableRotation.cpp
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#include "llvm/Pass.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/CFG.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/Transforms/Utils/Cloning.h"
#include "llvm/Transforms/IPO/PassManagerBuilder.h"
#include "assert.h"
#include<vector>
#include<algorithm>
#include<ctime>
#include<cstdlib>
#include<cstdio>
using namespace llvm;
namespace
{
struct VariableRotation : public ModulePass
{
static char ID;
VariableRotation() : ModulePass(ID) {}
Function *createRotateFunc(Module *m,PointerType *ptrType,Twine &name);
void processFunction(Function &f,SetVector<Function*> &shift);
bool processVars(Function &f,SetVector<AllocaInst*> &vars,Function *rotateFunc);
bool isUsedByInst(Instruction *inst,Value *var)
{
for(Value *ops:inst->operands())
if(ops==var)
return true;
return false;
}
bool runOnModule(Module &m) override
{
Twine fname1=Twine("shiftFuncitonI8");
Function *shiftFunc=createRotateFunc(&m,Type::getInt8PtrTy(m.getContext()),fname1);
SetVector<Function*> shifts;
shifts.insert(shiftFunc);
for(Function &f:m)
{
if(&f==shiftFunc)
continue;
if(f.hasExactDefinition())
processFunction(f,shifts);
}
return true;
}
};
}
char VariableRotation::ID=0;
static RegisterPass<VariableRotation> X("varobfu", "varobfu");
bool VariableRotation::processVars(Function &f,SetVector<AllocaInst*> &vars,Function *rotateFunc)
{
if(vars.size()<2)
return false;
IRBuilder<> irb(&*f.getEntryBlock().getFirstInsertionPt());
Value *zero=ConstantInt::get(irb.getInt32Ty(),0);
DataLayout data=f.getParent()->getDataLayout();
int space=0;
SetVector<int> value_map;
printf("function: %s\n",f.getName());
for(int i=0;i<vars.size();i++)
{
AllocaInst *a=vars[i];
value_map.insert(space);
printf("address: %d\n",space);
space+=data.getTypeAllocSize(a->getAllocatedType());
}
ArrayType *arrayType=ArrayType::get(irb.getInt8Ty(),space);
AllocaInst *array=irb.CreateAlloca(arrayType);
int prob=30;
for(BasicBlock &bb:f)
{
int offset=0;
BasicBlock::iterator iter=bb.getFirstInsertionPt();
if(&bb==&f.getEntryBlock())
iter++;
while(iter!=bb.end())
{
Instruction *inst=&*iter;
irb.SetInsertPoint(inst);
for(int i=0;i<vars.size();i++)
if(isUsedByInst(inst,vars[i]))
{
if(rand()%100<prob)
{
int times=rand()%(vars.size()-1)+1;
int delta=(space+value_map[(offset+times)%vars.size()]-value_map[offset])%space;
irb.CreateCall(FunctionCallee(rotateFunc),{irb.CreateGEP(array,{zero,zero}),ConstantInt::get(irb.getInt32Ty(),space),ConstantInt::get(irb.getInt32Ty(),delta)});
offset=(offset+times)%vars.size();
}
int index=(space+value_map[i]-value_map[offset])%space;
Value *gep=irb.CreateGEP(array,{zero,ConstantInt::get(irb.getInt32Ty(),index)});
Value *cast=irb.CreateBitOrPointerCast(gep,vars[i]->getType());
int c=0;
for(Value *ops:inst->operands())
{
if(ops==vars[i])
inst->setOperand(c,cast);
c++;
}
break;
}
iter++;
}
if(offset!=0)
{
irb.SetInsertPoint(bb.getTerminator());
irb.CreateCall(FunctionCallee(rotateFunc),{irb.CreateGEP(array,{zero,zero}),ConstantInt::get(irb.getInt32Ty(),space),ConstantInt::get(irb.getInt32Ty(),(space-value_map[offset])%space)});
}
}
return true;
}
void VariableRotation::processFunction(Function &f,SetVector<Function*> &shift)
{
SetVector<AllocaInst*> list;
for(BasicBlock &bb:f)
for(Instruction &instr:bb)
if(isa<AllocaInst>(instr))
{
AllocaInst *a=(AllocaInst*)&instr;
list.insert(a);
}
if(processVars(f,list,shift[0]))
{
for(AllocaInst *a:list)
a->eraseFromParent();
}
}
Function *VariableRotation::createRotateFunc(Module *m,PointerType *ptrType,Twine &name)
{
std::vector<Type*> params;
params.push_back(ptrType);
params.push_back(Type::getInt32Ty(m->getContext()));
params.push_back(Type::getInt32Ty(m->getContext()));
Type *rawType=ptrType->getPointerElementType();
FunctionType *funcType=FunctionType::get(Type::getVoidTy(m->getContext()),params,false);
Function *func=Function::Create(funcType,GlobalValue::PrivateLinkage,name,m);
BasicBlock *entry1=BasicBlock::Create(m->getContext(),"entry1",func);
BasicBlock *cmp1=BasicBlock::Create(m->getContext(),"cmp1",func);
BasicBlock *entry2=BasicBlock::Create(m->getContext(),"entry2",func);
BasicBlock *cmp2=BasicBlock::Create(m->getContext(),"cmp2",func);
BasicBlock *shift=BasicBlock::Create(m->getContext(),"shift",func);
BasicBlock *end2=BasicBlock::Create(m->getContext(),"end2",func);
BasicBlock *end1=BasicBlock::Create(m->getContext(),"end1",func);
Function::arg_iterator iter=func->arg_begin();
Value *ptr=iter;
Value *len=++iter;
Value *times=++iter;
IRBuilder<> irb(entry1);
Value *zero=ConstantInt::get(irb.getInt32Ty(),0);
Value *one=ConstantInt::get(irb.getInt32Ty(),1);
AllocaInst *i=irb.CreateAlloca(irb.getInt32Ty());
AllocaInst *j=irb.CreateAlloca(irb.getInt32Ty());
AllocaInst *tmp=irb.CreateAlloca(rawType);
AllocaInst *array=irb.CreateAlloca(ptrType);
irb.CreateStore(zero,j);
irb.CreateStore(ptr,array);
irb.CreateBr(cmp1);
irb.SetInsertPoint(cmp1);
irb.CreateCondBr(irb.CreateICmpSLT(irb.CreateLoad(j),times),entry2,end1);
irb.SetInsertPoint(entry2);
irb.CreateStore(zero,i);
irb.CreateStore(irb.CreateLoad(irb.CreateInBoundsGEP(irb.CreateLoad(array),{zero})),tmp);
irb.CreateBr(cmp2);
irb.SetInsertPoint(cmp2);
irb.CreateCondBr(irb.CreateICmpSLT(irb.CreateLoad(i),irb.CreateSub(len,one)),shift,end2);
irb.SetInsertPoint(shift);
Value *ival=irb.CreateLoad(i);
Value *arr=irb.CreateLoad(array);
irb.CreateStore(irb.CreateLoad(irb.CreateInBoundsGEP(arr,{irb.CreateAdd(ival,one)})),irb.CreateInBoundsGEP(rawType,arr,{ival}));
irb.CreateStore(irb.CreateAdd(ival,one),i);
irb.CreateBr(cmp2);
irb.SetInsertPoint(end2);
irb.CreateStore(irb.CreateAdd(irb.CreateLoad(j),one),j);
irb.CreateStore(irb.CreateLoad(tmp),irb.CreateInBoundsGEP(irb.CreateLoad(array),{irb.CreateSub(len,one)}));
irb.CreateBr(cmp1);
irb.SetInsertPoint(end1);
irb.CreateRetVoid();
return func;
}
static RegisterStandardPasses Y(PassManagerBuilder::EP_EarlyAsPossible,
[](const PassManagerBuilder &Builder, legacy::PassManagerBase &PM) {
PM.add(new VariableRotation());
});