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LLVMVM.cpp
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LLVMVM.cpp
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#include "llvm/Pass.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/CFG.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Instruction.h"
#include "llvm/LinkAllPasses.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Transforms/Utils/Cloning.h"
#include "llvm/Transforms/IPO/PassManagerBuilder.h"
#include<vector>
#include<utility>
#include<algorithm>
#include<ctime>
#include<cstdlib>
#include<iostream>
#define RAW_INST 0
#define PUSH_ADDR 1
#define STORE_IMM 2
using namespace llvm;
namespace
{
struct VMOpInfo
{
int opcode;
int builtin_type=RAW_INST;
std::vector<std::pair<int,Value*>> opnds;
union
{
Instruction *instr=nullptr;
int store_size;
};
};
struct LLVMVM : public ModulePass
{
static char ID;
std::vector<Function*> vm_funcs;
std::map<Function*,Function*> vm_mapping;
LLVMVM() : ModulePass(ID) {}
void getAnalysisUsage(AnalysisUsage &AU) const override
{
errs()<<"Require LowerSwitchPass\n";
AU.addRequiredID(LowerSwitchID);
ModulePass::getAnalysisUsage(AU);
}
void demoteRegisters(Function *f);
BasicBlock* handleAlloca(Function &f,std::map<Value*,int> &value_map,std::vector<std::pair<int,int>> &remap,int &space);
Function* virtualization(Function &f);
VMOpInfo *getOrCreateRawOp(Instruction &instr,std::vector<VMOpInfo*> &ops,int &cur_op);
bool check(Function &f);
void FixCallInst(Function *target,Function *orig);
void createBuiltinOps(std::vector<VMOpInfo*> &ops,int &cur_op);
std::string readAnnotate(Function *f);
void buildVMFunction(Function &f,Function &vm,std::vector<VMOpInfo*> &ops,int mem_size,GlobalVariable *opcodes,int tmp_size,std::vector<std::pair<int,int>> &remap,std::map<Value*,int> &value_map);
int generateOpcodes(std::vector<BasicBlock*> &code,std::map<Value*,int> &locals_addr_map,std::map<Instruction*,VMOpInfo*> &instr_map,std::vector<VMOpInfo*> &ops,int mem_size,std::vector<Constant *> &opcodes);
int allocaMemory(BasicBlock &bb,std::map<Instruction*,int> &alloca_map,int mem_base);
bool runOnModule(Module &m) override
{
std::vector<Function*> removed;
for(Function &f:m)
{
bool is_vm=false;
for(Function *ff:vm_funcs)
{
if(&f==ff)
{
is_vm=true;
break;
}
}
if(!is_vm && f.hasExactDefinition() && !readAnnotate(&f).find("virtualization"))
{
Function *vmfunc=virtualization(f);
if(vmfunc!=NULL)
{
vm_funcs.push_back(vmfunc);
FixCallInst(vmfunc,&f);
}
}
}
return false;
}
};
}
std::string LLVMVM::readAnnotate(Function *f)
{
std::string annotation = "";
/* Get annotation variable */
GlobalVariable *glob=f->getParent()->getGlobalVariable( "llvm.global.annotations" );
if ( glob != NULL )
{
/* Get the array */
if ( ConstantArray * ca = dyn_cast<ConstantArray>( glob->getInitializer() ) )
{
for ( unsigned i = 0; i < ca->getNumOperands(); ++i )
{
/* Get the struct */
if ( ConstantStruct * structAn = dyn_cast<ConstantStruct>( ca->getOperand( i ) ) )
{
if ( ConstantExpr * expr = dyn_cast<ConstantExpr>( structAn->getOperand( 0 ) ) )
{
/*
* If it's a bitcast we can check if the annotation is concerning
* the current function
*/
if ( expr->getOpcode() == Instruction::BitCast && expr->getOperand( 0 ) == f )
{
ConstantExpr *note = cast<ConstantExpr>( structAn->getOperand( 1 ) );
/*
* If it's a GetElementPtr, that means we found the variable
* containing the annotations
*/
if ( note->getOpcode() == Instruction::GetElementPtr )
{
if ( GlobalVariable * annoteStr = dyn_cast<GlobalVariable>( note->getOperand( 0 ) ) )
{
if ( ConstantDataSequential * data = dyn_cast<ConstantDataSequential>( annoteStr->getInitializer() ) )
{
if ( data->isString() )
{
annotation += data->getAsString().lower() + " ";
}
}
}
}
}
}
}
}
}
}
return(annotation);
}
void LLVMVM::demoteRegisters(Function *f)
{
std::vector<PHINode *> tmpPhi;
std::vector<Instruction *> tmpReg;
BasicBlock *bbEntry = &*f->begin();
do
{
tmpPhi.clear();
tmpReg.clear();
for(Function::iterator i=f->begin();i!=f->end();i++)
{
for(BasicBlock::iterator j=i->begin();j!=i->end();j++)
{
if(isa<PHINode>(j))
{
PHINode *phi=cast<PHINode>(j);
tmpPhi.push_back(phi);
continue;
}
if (!(isa<AllocaInst>(j) && j->getParent()==bbEntry) && j->isUsedOutsideOfBlock(&*i))
{
tmpReg.push_back(&*j);
continue;
}
}
}
for(unsigned int i=0;i<tmpReg.size();i++)
DemoteRegToStack(*tmpReg.at(i),f->begin()->getTerminator());
for(unsigned int i=0;i<tmpPhi.size();i++)
DemotePHIToStack(tmpPhi.at(i),f->begin()->getTerminator());
}
while(tmpReg.size()!= 0 || tmpPhi.size()!= 0);
}
BasicBlock* LLVMVM::handleAlloca(Function &f,std::map<Value*,int> &value_map,std::vector<std::pair<int,int>> &remap,int &space)
{
std::vector<AllocaInst*> allocas;
printf(" -collect allocainst\n");
for(BasicBlock &bb:f)
for(Instruction &i:bb)
{
if(isa<AllocaInst>(i))
allocas.push_back((AllocaInst*)&i);
}
BasicBlock *alloca_block=&f.getEntryBlock();
printf(" -move allocainst before\n");
for(AllocaInst* a:allocas)
a->moveBefore(&*alloca_block->getFirstInsertionPt());
printf(" -split allocainst block\n");
for(Instruction &i:*alloca_block)
{
if(!isa<AllocaInst>(i))
{
alloca_block->splitBasicBlock(&i);
break;
}
}
printf(" -calculate locals address\n");
DataLayout data=f.getParent()->getDataLayout();
for(AllocaInst* a:allocas)
{
int real_addr=space;
printf(" [%4d] alloc size %d\n",real_addr,data.getTypeAllocSize(a->getAllocatedType()));
space+=data.getTypeAllocSize(a->getAllocatedType());
int ptr_addr=space;
value_map[a]=space;
printf(" [%4d] store ptr size %d\n",ptr_addr,data.getTypeAllocSize(a->getType()));
space+=data.getTypeAllocSize(a->getType());
remap.push_back(std::make_pair(ptr_addr,real_addr));
}
return alloca_block;
}
void findOperand(Instruction &instr,std::vector<std::pair<int,Value*>> &operand,std::vector<std::pair<int,Value*>> &unsupported)
{
int i=0;
for(Value *opnd:instr.operands())
{
if(isa<ConstantInt>(*opnd)/* || isa<ConstantFP>(*opnd)*/ || isa<Instruction>(*opnd) || isa<Argument>(*opnd))
operand.push_back(std::make_pair(i,(GlobalVariable*)opnd));
else
unsupported.push_back(std::make_pair(i,(GlobalVariable*)opnd));
i++;
}
}
VMOpInfo *LLVMVM::getOrCreateRawOp(Instruction &instr,std::vector<VMOpInfo*> &ops,int &cur_op)
{
if(instr.getOpcode()==Instruction::Br)
{
for(VMOpInfo *info:ops)
{
if(info->instr->getOpcode()==Instruction::Br)
return info;
}
VMOpInfo *news=new VMOpInfo();
news->opcode=cur_op++;
news->instr=&instr;
ops.push_back(news);
return news;
}
else
{
std::vector<std::pair<int,Value*>> operand1,un1;
findOperand(instr,operand1,un1);
for(VMOpInfo *info:ops)
{
if(info->instr!=nullptr && info->instr->isSameOperationAs(&instr))
{
if(un1.size()==0)
return info;
else
{
std::vector<std::pair<int,Value*>> operand2,un2;
findOperand(*info->instr,operand2,un2);
if(un1.size()!=un2.size())
continue;
bool ok=true;
for(int i=0;i<un1.size();i++)
{
if(un1[i]!=un2[i])
{
ok=false;
break;
}
}
if(ok)
return info;
}
}
}
VMOpInfo *news=new VMOpInfo();
news->opcode=cur_op++;
news->instr=&instr;
for(int i=0;i<operand1.size();i++)
news->opnds.push_back(operand1.at(i));
ops.push_back(news);
return news;
}
}
bool LLVMVM::check(Function &f)
{
for(BasicBlock &bb:f)
for(Instruction &i:bb)
{
if((i.isTerminator() && !isa<BranchInst>(i) && !isa<ReturnInst>(i)) || i.isFuncletPad())
{
printf("[!] Unsupported Instruction Type: %s\n",i.getOpcodeName());
return false;
}
}
return true;
}
void LLVMVM::createBuiltinOps(std::vector<VMOpInfo*> &ops,int &cur_op)
{
VMOpInfo *push_addr=new VMOpInfo();
push_addr->opcode=cur_op++;
push_addr->builtin_type=PUSH_ADDR;
VMOpInfo *store_1b=new VMOpInfo();
store_1b->opcode=cur_op++;
store_1b->builtin_type=STORE_IMM;
store_1b->store_size=1;
VMOpInfo *store_2b=new VMOpInfo();
store_2b->opcode=cur_op++;
store_2b->builtin_type=STORE_IMM;
store_2b->store_size=2;
VMOpInfo *store_4b=new VMOpInfo();
store_4b->opcode=cur_op++;
store_4b->builtin_type=STORE_IMM;
store_4b->store_size=4;
VMOpInfo *store_8b=new VMOpInfo();
store_8b->opcode=cur_op++;
store_8b->builtin_type=STORE_IMM;
store_8b->store_size=8;
ops.push_back(push_addr);
ops.push_back(store_1b);
ops.push_back(store_2b);
ops.push_back(store_4b);
ops.push_back(store_8b);
}
void LLVMVM::buildVMFunction(Function &f,Function &vm,std::vector<VMOpInfo*> &ops,int mem_size,GlobalVariable *opcodes,int addr_stack_size,std::vector<std::pair<int,int>> &remap,std::map<Value*,int> &value_map)
{
assert(ops.size()<=255);
BasicBlock *entry=BasicBlock::Create(vm.getContext(),"entry",&vm);
BasicBlock *dispatch=BasicBlock::Create(vm.getContext(),"dispatch",&vm);
BasicBlock *loop_end=BasicBlock::Create(vm.getContext(),"loopend",&vm);
IRBuilder<> irb(entry);
Value *pc=irb.CreateAlloca(irb.getInt32Ty());
Value *memory=irb.CreateAlloca(ArrayType::get(irb.getInt8Ty(),mem_size));
Value *addr_stack=irb.CreateAlloca(ArrayType::get(irb.getInt32Ty(),addr_stack_size));
Value *ptr=irb.CreateAlloca(irb.getInt32Ty());
//initial for locals
printf("- initial for locals\n");
for(std::pair<int,int> p:remap)
{
int ptr_addr=p.first,real_addr=p.second;
Value *ptr=irb.CreateGEP(memory,{irb.getInt32(0),irb.getInt32(real_addr)});
Value *to_store=irb.CreateGEP(memory,{irb.getInt32(0),irb.getInt32(ptr_addr)});
irb.CreateStore(ptr,irb.CreateBitCast(to_store,ptr->getType()->getPointerTo()));
}
//initial for arguments
Function::arg_iterator real_iter=vm.arg_begin();
for(Function::arg_iterator iter=f.arg_begin();iter!=f.arg_end();iter++)
{
Value *arg=&*iter;
Value *real_arg=&*real_iter;
assert(value_map.count(arg)!=0);
int addr=value_map[arg];
Value *to_store=irb.CreateGEP(memory,{irb.getInt32(0),irb.getInt32(addr)});
irb.CreateStore(real_arg,irb.CreateBitCast(to_store,real_arg->getType()->getPointerTo()));
real_iter++;
}
irb.CreateStore(irb.getInt32(0),pc);
irb.CreateStore(irb.getInt32(0),ptr);
BranchInst::Create(dispatch,entry);
irb.SetInsertPoint(dispatch);
Value *opvalue=irb.CreateLoad(irb.CreateGEP(opcodes,{irb.getInt32(0),irb.CreateLoad(pc)}));
irb.CreateStore(irb.CreateAdd(irb.CreateLoad(pc),irb.getInt32(1)),pc);
SwitchInst *dispatcher=SwitchInst::Create(opvalue,loop_end,0,dispatch);
bool has_br=false;
for(VMOpInfo* op:ops)
{
if(op->builtin_type)
{
if(op->builtin_type==PUSH_ADDR)
{
BasicBlock *handler=BasicBlock::Create(vm.getContext(),"push_addr",&vm);
dispatcher->addCase(irb.getInt8(op->opcode),handler);
irb.SetInsertPoint(handler);
Value *vpc=irb.CreateLoad(pc);
Value *vptr=irb.CreateLoad(ptr);
Value *addr=irb.CreateLoad(irb.CreateBitCast(irb.CreateGEP(opcodes,{irb.getInt32(0),vpc}),irb.getInt32Ty()->getPointerTo()));
irb.CreateStore(addr,irb.CreateGEP(addr_stack,{irb.getInt32(0),vptr}));
irb.CreateStore(irb.CreateAdd(vptr,irb.getInt32(1)),ptr);
irb.CreateStore(irb.CreateAdd(vpc,irb.getInt32(4)),pc);
BranchInst::Create(loop_end,handler);
handler->moveBefore(loop_end);
}
else if(op->builtin_type==STORE_IMM)
{
if(op->store_size==1)
{
BasicBlock *handler=BasicBlock::Create(vm.getContext(),"store_imm1",&vm);
irb.SetInsertPoint(handler);
dispatcher->addCase(irb.getInt8(op->opcode),handler);
Value *vpc=irb.CreateLoad(pc);
Value *vptr=irb.CreateLoad(ptr);
Value *imm=irb.CreateLoad(irb.CreateGEP(opcodes,{irb.getInt32(0),vpc}));
Value *addr=irb.CreateLoad(irb.CreateGEP(addr_stack,{irb.getInt32(0),irb.CreateSub(vptr,irb.getInt32(1))}));
irb.CreateStore(imm,irb.CreateGEP(memory,{irb.getInt32(0),addr}));
irb.CreateStore(irb.CreateSub(vptr,irb.getInt32(1)),ptr);
irb.CreateStore(irb.CreateAdd(vpc,irb.getInt32(1)),pc);
BranchInst::Create(loop_end,handler);
handler->moveBefore(loop_end);
}
else if(op->store_size==2)
{
BasicBlock *handler=BasicBlock::Create(vm.getContext(),"store_imm2",&vm);
irb.SetInsertPoint(handler);
dispatcher->addCase(irb.getInt8(op->opcode),handler);
Value *vpc=irb.CreateLoad(pc);
Value *vptr=irb.CreateLoad(ptr);
Value *imm=irb.CreateLoad(irb.CreateBitCast(irb.CreateGEP(opcodes,{irb.getInt32(0),vpc}),irb.getInt16Ty()->getPointerTo()));
Value *addr=irb.CreateLoad(irb.CreateGEP(addr_stack,{irb.getInt32(0),irb.CreateSub(vptr,irb.getInt32(1))}));
irb.CreateStore(imm,irb.CreateBitCast(irb.CreateGEP(memory,{irb.getInt32(0),addr}),irb.getInt16Ty()->getPointerTo()));
irb.CreateStore(irb.CreateSub(vptr,irb.getInt32(1)),ptr);
irb.CreateStore(irb.CreateAdd(vpc,irb.getInt32(2)),pc);
BranchInst::Create(loop_end,handler);
handler->moveBefore(loop_end);
}
else if(op->store_size==4)
{
BasicBlock *handler=BasicBlock::Create(vm.getContext(),"store_imm4",&vm);
irb.SetInsertPoint(handler);
dispatcher->addCase(irb.getInt8(op->opcode),handler);
Value *vpc=irb.CreateLoad(pc);
Value *vptr=irb.CreateLoad(ptr);
Value *imm=irb.CreateLoad(irb.CreateBitCast(irb.CreateGEP(opcodes,{irb.getInt32(0),vpc}),irb.getInt32Ty()->getPointerTo()));
Value *addr=irb.CreateLoad(irb.CreateGEP(addr_stack,{irb.getInt32(0),irb.CreateSub(vptr,irb.getInt32(1))}));
irb.CreateStore(imm,irb.CreateBitCast(irb.CreateGEP(memory,{irb.getInt32(0),addr}),irb.getInt32Ty()->getPointerTo()));
irb.CreateStore(irb.CreateSub(vptr,irb.getInt32(1)),ptr);
irb.CreateStore(irb.CreateAdd(vpc,irb.getInt32(4)),pc);
BranchInst::Create(loop_end,handler);
handler->moveBefore(loop_end);
}
else
{
BasicBlock *handler=BasicBlock::Create(vm.getContext(),"store_imm8",&vm);
irb.SetInsertPoint(handler);
dispatcher->addCase(irb.getInt8(op->opcode),handler);
Value *vpc=irb.CreateLoad(pc);
Value *vptr=irb.CreateLoad(ptr);
Value *imm=irb.CreateLoad(irb.CreateBitCast(irb.CreateGEP(opcodes,{irb.getInt32(0),vpc}),irb.getInt64Ty()->getPointerTo()));
Value *addr=irb.CreateLoad(irb.CreateGEP(addr_stack,{irb.getInt32(0),irb.CreateSub(vptr,irb.getInt32(1))}));
irb.CreateStore(imm,irb.CreateBitCast(irb.CreateGEP(memory,{irb.getInt32(0),addr}),irb.getInt64Ty()->getPointerTo()));
irb.CreateStore(irb.CreateSub(vptr,irb.getInt32(1)),ptr);
irb.CreateStore(irb.CreateAdd(vpc,irb.getInt32(8)),pc);
BranchInst::Create(loop_end,handler);
handler->moveBefore(loop_end);
}
}
else
assert(false && "Unknow builtin op type!");
}
else
{
if(op->instr->getOpcode()==Instruction::Br)
{
if(!has_br)
{
BasicBlock *handler=BasicBlock::Create(vm.getContext(),Twine("branch"),&vm);
irb.SetInsertPoint(handler);
dispatcher->addCase(irb.getInt8(op->opcode),handler);
Value *vpc=irb.CreateLoad(pc);
Value *vptr=irb.CreateLoad(ptr);
Value *cond_addr=irb.CreateLoad(irb.CreateGEP(addr_stack,{irb.getInt32(0),irb.CreateSub(vptr,irb.getInt32(1))}));
Value *cond=irb.CreateLoad(irb.CreateBitCast(irb.CreateGEP(memory,{irb.getInt32(0),cond_addr}),irb.getInt1Ty()->getPointerTo()));
Value *jmp_offset=irb.CreateLoad(irb.CreateBitCast(irb.CreateGEP(opcodes,{irb.getInt32(0),vpc}),irb.getInt32Ty()->getPointerTo()));
Value *final_offset=irb.CreateSelect(cond,jmp_offset,irb.getInt32(4));
irb.CreateStore(irb.CreateAdd(vpc,final_offset),pc);
irb.CreateStore(irb.CreateSub(vptr,irb.getInt32(1)),ptr);
BranchInst::Create(loop_end,handler);
handler->moveBefore(loop_end);
has_br=true;
}
}
else
{
BasicBlock *handler=BasicBlock::Create(vm.getContext(),Twine("handler_")+op->instr->getOpcodeName(),&vm);
irb.SetInsertPoint(handler);
dispatcher->addCase(irb.getInt8(op->opcode),handler);
Value *vpc=irb.CreateLoad(pc);
Value *vptr=irb.CreateLoad(ptr);
Instruction *target=op->instr->clone();
Value *pos=vptr;
int arg_num=op->opnds.size();
for(int i=0;i<arg_num;i++)
{
std::pair<int,Value*> p=op->opnds[i];
Value *arg_addr=irb.CreateLoad(irb.CreateGEP(addr_stack,{irb.getInt32(0),irb.CreateSub(vptr,irb.getInt32(arg_num-i))}));
Value *arg=irb.CreateLoad(irb.CreateBitCast(irb.CreateGEP(memory,{irb.getInt32(0),arg_addr}),p.second->getType()->getPointerTo()));
target->setOperand(p.first,arg);
pos=arg;
}
target->insertAfter((Instruction*)pos);
if(target->getOpcode()==Instruction::Ret)
{
handler->moveBefore(loop_end);
continue;
}
if(!target->getType()->isVoidTy())
{
Value *to_store=irb.CreateLoad(irb.CreateBitCast(irb.CreateGEP(opcodes,{irb.getInt32(0),vpc}),irb.getInt32Ty()->getPointerTo()));
irb.CreateStore(target,irb.CreateBitCast(irb.CreateGEP(memory,{irb.getInt32(0),to_store}),target->getType()->getPointerTo()));
irb.CreateStore(irb.CreateAdd(vpc,irb.getInt32(4)),pc);
}
irb.CreateStore(irb.CreateSub(vptr,irb.getInt32(arg_num)),ptr);
BranchInst::Create(loop_end,handler);
handler->moveBefore(loop_end);
}
}
}
BranchInst::Create(dispatch,loop_end);
}
bool cmp(std::pair<Instruction*,int> &a, std::pair<Instruction*,int> &b)
{
return a.second<b.second;
}
int LLVMVM::allocaMemory(BasicBlock &bb,std::map<Instruction*,int> &alloca_map,int mem_base)
{
int max_space=0;
DataLayout data=bb.getParent()->getParent()->getDataLayout();
std::map<Instruction*,std::set<Instruction*>*> alive;
for(Instruction &i:bb)
{
if(alive.count(&i)==0)
{
std::set<Instruction*> *instr_set=new std::set<Instruction*>;
alive[&i]=instr_set;
}
}
for(Instruction &i:bb)
{
if(i.isUsedOutsideOfBlock(&bb))
assert(false && "Impossible: value escaped");
for(Value *opnd:i.operands())
{
if(isa<Instruction>(*opnd) && !isa<AllocaInst>(*opnd))
{
Instruction* instr=(Instruction*)opnd;
if(instr->getParent()!=&bb)
assert(false && "Impossible: value escaped");
BasicBlock::iterator start=instr->getIterator(),end=i.getIterator();
++end;
for(BasicBlock::iterator iter=++start;iter!=end;iter++)
{
Instruction *ii=&*iter;
alive[ii]->insert(instr);
}
}
}
}
/*for(Instruction &i:bb)
{
printf("current opname: %s\n\t",i.getOpcodeName());
if(alive[&i]->size()==0)
printf("null");
for(std::set<Instruction*>::iterator iter=alive[&i]->begin();iter!=alive[&i]->end();iter++)
printf("%s ",(*iter)->getOpcodeName());
printf("\n");
}*/
//printf("value remain!\n");
std::vector<std::pair<Instruction*,int>> current_alloc;
for(Instruction &i:bb)
{
std::vector<std::pair<Instruction*,int>> freed;
for(std::vector<std::pair<Instruction*,int>>::iterator iter=current_alloc.begin();iter!=current_alloc.end();iter++)
{
std::pair<Instruction*,int> p=*iter;
bool find=false;
for(std::set<Instruction*>::iterator iter=alive[&i]->begin();iter!=alive[&i]->end();iter++)
{
if(p.first==*iter)
{
find=true;
break;
}
}
if(!find)
{
//printf(" free value opcode: %s\n",p.first->getOpcodeName());
freed.push_back(p);
}
}
for(std::pair<Instruction*,int> pp:freed)
{
for(std::vector<std::pair<Instruction*,int>>::iterator iter=current_alloc.begin();iter!=current_alloc.end();iter++)
{
std::pair<Instruction*,int> p=*iter;
if(p==pp)
{
current_alloc.erase(iter);
break;
}
}
}
//printf("2 --------- %s\n",i.getOpcodeName());
//printf(" allocated value num: %d\n",current_alloc.size());
sort(current_alloc,cmp);
for(std::vector<std::pair<Instruction*,int>>::iterator iter=current_alloc.begin();iter!=current_alloc.end();iter++)
{
std::pair<Instruction*,int> p=*iter;
//printf(" > value %s at addr %d\n",p.first->getOpcodeName(),p.second+mem_base);
}
//printf("free ok %d!\n",freed.size());
if(!i.getType()->isVoidTy())
{
//printf(" this instruction need space %d\n",data.getTypeAllocSize(i.getType()));
std::vector<std::pair<Instruction*,int>>::iterator ptr=current_alloc.begin(),prev;
while(ptr!=current_alloc.end())
{
int space,addr;
std::pair<Instruction*,int> cur=*ptr;
if(ptr!=current_alloc.begin())
{
addr=prev->second+data.getTypeAllocSize(prev->first->getType());
space=cur.second-addr;
}
else
{
addr=0;
space=cur.second;
}
if(space>=data.getTypeAllocSize(i.getType()))
{
//printf(" find free space\n");
current_alloc.insert(ptr,std::make_pair(&i,addr));
alloca_map[&i]=addr+mem_base;
break;
}
prev=ptr;
ptr++;
}
if(ptr==current_alloc.end())
{
//printf(" no free space,alloca new space\n");
int addr;
if(current_alloc.size()!=0)
addr=prev->second+data.getTypeAllocSize(prev->first->getType());
else
addr=0;
int bound=addr+data.getTypeAllocSize(i.getType());
max_space=max_space>bound?max_space:bound;
current_alloc.push_back(std::make_pair(&i,addr));
alloca_map[&i]=addr+mem_base;
}
}
//if(alloca_map.count(&i)>0)
//printf(" [~] value addr: %d\n",alloca_map[&i]);
}
//printf("-----after alloca max_space %d\n",max_space+mem_base);
for(Instruction &i:bb)
delete alive[&i];
return max_space+mem_base;
}
void pushBytes(unsigned char* ptr,int size,std::vector<unsigned char> &buffer)
{
for(int i=0;i<size;i++)
buffer.push_back(ptr[i]);
}
int queryAddr(Value *v,std::map<Value*,int> &locals_addr_map,std::map<Instruction*,int> ®_addr_map)
{
int addr;
if(locals_addr_map.count(v)!=0)
return locals_addr_map[v];
else if(reg_addr_map.count((Instruction*)v)!=0)
return reg_addr_map[(Instruction*)v];
else
assert(false && "Unknown value!");
}
unsigned char findStoreImmOp(std::vector<VMOpInfo*> &ops,int store_size)
{
for(VMOpInfo *op:ops)
{
if(op->builtin_type==STORE_IMM && op->store_size==store_size)
return op->opcode;
}
assert(false);
}
unsigned char findPushAddrOp(std::vector<VMOpInfo*> &ops)
{
for(VMOpInfo *op:ops)
{
if(op->builtin_type==PUSH_ADDR)
return op->opcode;
}
assert(false);
}
unsigned char findBranchOp(std::vector<VMOpInfo*> &ops)
{
for(VMOpInfo *op:ops)
{
if(op->instr->getOpcode()==Instruction::Br)
return op->opcode;
}
assert(false);
}
int LLVMVM::generateOpcodes(std::vector<BasicBlock*> &code,std::map<Value*,int> &locals_addr_map,std::map<Instruction*,VMOpInfo*> &instr_map,std::vector<VMOpInfo*> &ops,int mem_size,std::vector<Constant *> &opcodes)
{
if(code.size()==0)
return mem_size;
std::vector<unsigned char> opcodes_raw;
int new_mem_size=mem_size;
LLVMContext *context=&code[0]->getContext();
std::vector<std::pair<int,BasicBlock*>> br_to_fix;
std::map<BasicBlock*,int> block_addr;
unsigned char store1_op=findStoreImmOp(ops,1);
unsigned char store2_op=findStoreImmOp(ops,2);
unsigned char store4_op=findStoreImmOp(ops,4);
unsigned char store8_op=findStoreImmOp(ops,8);
unsigned char push_addr_op=findPushAddrOp(ops);
for(int i=0;i<code.size();i++)
{
BasicBlock *bb=code[i];
DataLayout data=bb->getParent()->getParent()->getDataLayout();
int cur_addr=opcodes_raw.size();
block_addr[bb]=cur_addr;
std::map<Instruction*,int> reg_addr_map;
int allocated_space=allocaMemory(*bb,reg_addr_map,mem_size);
int max_used_space=allocated_space;
for(Instruction &instr:*bb)
{
assert(instr_map.count(&instr)!=0);
VMOpInfo *op=instr_map[&instr];
int used_space=allocated_space;
if(isa<BranchInst>(instr))
{
BranchInst *br=(BranchInst*)&instr;
unsigned char br_op=findBranchOp(ops);
if(br->isConditional())
{
Value *cond=br->getCondition();
assert(cond->getType()==Type::getInt1Ty(*context));
int addr=queryAddr(cond,locals_addr_map,reg_addr_map);
int empty=0xdeadbeef;
// push addr
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(push_addr_op);
pushBytes((unsigned char*)&addr,4,opcodes_raw);
printf("push addr=[%d]\n",addr);
// br offset
printf("%-6d",opcodes_raw.size());
br_to_fix.push_back(std::make_pair(opcodes_raw.size(),br->getSuccessor(0)));
opcodes_raw.push_back(br_op);
pushBytes((unsigned char*)&empty,4,opcodes_raw);
printf("branch offset=%d\n",empty);
if(i==code.size()-1 || code[i+1]!=br->getSuccessor(1))
{
int true_value=1;
//push addr
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(push_addr_op);
pushBytes((unsigned char*)&used_space,4,opcodes_raw);
printf("push addr=[%d]\n",used_space);
//store 1
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(store1_op);
pushBytes((unsigned char*)&true_value,1,opcodes_raw);
printf("store imm1=%d\n",1);
//push addr
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(push_addr_op);
pushBytes((unsigned char*)&used_space,4,opcodes_raw);
printf("push addr=[%d]\n",used_space);
//br offset
br_to_fix.push_back(std::make_pair(opcodes_raw.size(),br->getSuccessor(1)));
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(br_op);
pushBytes((unsigned char*)&empty,4,opcodes_raw);
printf("branch offset=%d\n",empty);
used_space+=1;
}
}
else
{
if(i==code.size()-1 || code[i+1]!=br->getSuccessor(0))
{
int true_value=1;
int empty=0xdeadbeef;
//push addr
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(push_addr_op);
pushBytes((unsigned char*)&used_space,4,opcodes_raw);
printf("push addr=[%d]\n",used_space);
//store 1
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(store1_op);
pushBytes((unsigned char*)&true_value,1,opcodes_raw);
printf("store imm1=%d\n",1);
//push addr
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(push_addr_op);
pushBytes((unsigned char*)&used_space,4,opcodes_raw);
printf("push addr=[%d]\n",used_space);
//br offset
printf("%-6d",opcodes_raw.size());
br_to_fix.push_back(std::make_pair(opcodes_raw.size(),br->getSuccessor(0)));
opcodes_raw.push_back(br_op);
pushBytes((unsigned char*)&empty,4,opcodes_raw);
printf("branch offset=%d\n",empty);
used_space+=1;
}
}
}
else
{
VMOpInfo *vmop=instr_map[&instr];
for(std::pair<int,Value*> p:vmop->opnds)
{
Value *op=instr.getOperand(p.first);
if(isa<ConstantInt>(*op)/* || isa<ConstantFP>(op)*/)
{
ConstantInt *val=(ConstantInt*)op;
int store_size=data.getTypeAllocSize(val->getType());
if(store_size==1)
{
//push addr
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(push_addr_op);
pushBytes((unsigned char*)&used_space,4,opcodes_raw);
printf("push addr=[%d]\n",used_space);
//store value
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(store1_op);
unsigned char r=val->getZExtValue()&0xff;
pushBytes((unsigned char*)&r,1,opcodes_raw);
printf("store imm1=%d\n",r);
//push addr
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(push_addr_op);
pushBytes((unsigned char*)&used_space,4,opcodes_raw);
printf("push addr=[%d]\n",used_space);
used_space+=1;
}
else if(store_size==2)
{
//push addr
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(push_addr_op);
pushBytes((unsigned char*)&used_space,4,opcodes_raw);
printf("push addr=[%d]\n",used_space);
//store value
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(store2_op);
unsigned short r=val->getZExtValue()&0xff;
pushBytes((unsigned char*)&r,2,opcodes_raw);
printf("store imm2=%d\n",r);
//push addr
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(push_addr_op);
pushBytes((unsigned char*)&used_space,4,opcodes_raw);
printf("push addr=[%d]\n",used_space);
used_space+=2;
}
else if(store_size==4)
{
//push addr
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(push_addr_op);
pushBytes((unsigned char*)&used_space,4,opcodes_raw);
printf("push addr=[%d]\n",used_space);
//store value
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(store4_op);
unsigned int r=val->getZExtValue();
pushBytes((unsigned char*)&r,4,opcodes_raw);
printf("store imm4=%d\n",r);
//push addr
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(push_addr_op);
pushBytes((unsigned char*)&used_space,4,opcodes_raw);
printf("push addr=[%d]\n",used_space);
used_space+=4;
}
else if(store_size==8)
{
//push addr
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(push_addr_op);
pushBytes((unsigned char*)&used_space,4,opcodes_raw);
printf("push addr=[%d]\n",used_space);
//store value
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(store8_op);
unsigned long long r=val->getZExtValue();
pushBytes((unsigned char*)&r,8,opcodes_raw);
printf("store imm8=%lld\n",r);
//push addr
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(push_addr_op);
pushBytes((unsigned char*)&used_space,4,opcodes_raw);
printf("push addr=[%d]\n",used_space);
used_space+=8;
}
else
assert(false);
}
else
{
int addr=queryAddr(op,locals_addr_map,reg_addr_map);
//push addr
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(push_addr_op);
pushBytes((unsigned char*)&addr,4,opcodes_raw);
printf("push addr=[%d]\n",addr);
}
}
if(!instr.getType()->isVoidTy())
{
//handler addr
int addr=queryAddr(&instr,locals_addr_map,reg_addr_map);
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(vmop->opcode);
pushBytes((unsigned char*)&addr,4,opcodes_raw);
printf("handler_%d st=[%d] name=%s\n",vmop->opcode,addr,vmop->instr->getOpcodeName());
}
else
{
//handler
printf("%-6d",opcodes_raw.size());
opcodes_raw.push_back(vmop->opcode);
printf("handler_%d name=%s\n",vmop->opcode,vmop->instr->getOpcodeName());
}
}
max_used_space=max_used_space>used_space?max_used_space:used_space;
printf("\n");
}
printf(" block max used space: %d\n\n",max_used_space);
new_mem_size=new_mem_size>max_used_space?new_mem_size:max_used_space;
}
for(std::pair<int,BasicBlock*> p:br_to_fix)
{
int pos=p.first+1;
assert(opcodes_raw[pos]==0xEF && opcodes_raw[pos+1]==0xBE && opcodes_raw[pos+2]==0xAD && opcodes_raw[pos+3]==0xDE);
BasicBlock *target=p.second;
assert(block_addr.count(target)!=0);
int delta=block_addr[target]-pos;
unsigned char *ptr=(unsigned char*)δ
for(int i=0;i<4;i++)
opcodes_raw[pos+i]=ptr[i];
}
for(unsigned char op:opcodes_raw)
opcodes.push_back(ConstantInt::get(Type::getInt8Ty(*context),op));
return new_mem_size;
}
void LLVMVM::FixCallInst(Function *target,Function *orig)
{
orig->dropAllReferences();
BasicBlock *dummy=BasicBlock::Create(orig->getContext(),"dummy",orig);
IRBuilder<> irb(dummy);
std::vector<Value*> args;
for(Function::arg_iterator iter=orig->arg_begin();iter!=orig->arg_end();iter++)
args.push_back(&*iter);
Value *call=irb.CreateCall(FunctionCallee(target),args);
if(target->getReturnType()->isVoidTy())
irb.CreateRetVoid();
else
irb.CreateRet(call);
/*for(Function &func:*target->getParent())
for(BasicBlock &bb:func)
for(Instruction &ii:bb)
{
if(isa<CallInst>(ii))
{
CallInst* callInst=&cast<CallInst>(ii);
if(callInst->getCalledFunction()==orig)
callInst->setCalledFunction(FunctionCallee(target));
}
}
*/
}
Function* LLVMVM::virtualization(Function &f)
{
printf("\nFunction Name: %s\n",f.getName());
if(!check(f))