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tainter.cpp
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tainter.cpp
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//#include "DLCallGraph.h"
#include "restoreSave.h"
/*
Function: switch to control output information;
Value: 0 : error : _ERROR_LEVEL
1 : warning : _WARNING_LEVEL
2 : debug : _DEBUG_LEVEL
3 : redundency: _REDUNDENCY_LEVEL
*/
unsigned debug_level = _DEBUG_LEVEL;
Module *M = nullptr;
struct DLCallGraph *DLCG;
vector<BitCastOperator *> verifiedStructTypeList; // vec to record the cast the turn Type %struct.redisServer into Type %struct.redisServer.xxx
vector<Instruction *> visitedLoadStoreInstList; // record visited Load/Store Inst.
vector<User *> visitedStructGVCases; // if a User is matched with a structual GV, we don't need to revisit it for other GVs.
vector<string> CommonLibFunctions;
vector<
pair<pair<Type *,
vector<int>>,
Value *>>
GEPTypeOffsetInstList; // record ALL GEPinstruction to make the anaylze field-sensitive. A little stupid but work.
/// Fetch the instrcution who use the result a GEP inst. who fetches the type "Type*" with offsets "vector<int>"
Value *FetchValue4FurtherFollow(Type *type, vector<int> *indice, Value *get_inst)
{
// pair<pair<Type *, vector<int>>, Value*> * GEPInfo){
Value *match_value = nullptr;
for (vector<pair<pair<Type *, vector<int>>, Value *>>::iterator i = GEPTypeOffsetInstList.begin(); i != GEPTypeOffsetInstList.end(); i++)
{
if (i->first.first != type) // Type* not match
continue;
if (i->first.second != *indice) // offset not match
continue;
if (i->second == get_inst) // this gep_ins has been recorded before, by using the "addr" of store_ins
continue;
match_value = i->second;
}
return match_value;
};
/// Fetch the instrcution who use the result a GEP inst. who fetches the type "Type*" with offsets "vector<int>"
vector<Value *> FetchValue4FurtherFollow2(string type, vector<int> *indice)
{
vector<Value *> res;
// pair<pair<Type *, vector<int>>, Value*> * GEPInfo){
Value *match_value = nullptr;
for (vector<pair<pair<Type *, vector<int>>, Value *>>::iterator i = GEPTypeOffsetInstList.begin(); i != GEPTypeOffsetInstList.end(); i++)
{
string fulltype = "%struct." + type + "*";
std::string type_str;
llvm::raw_string_ostream rso(type_str);
i->first.first->print(rso);
// **** DEBUG ****
//llvm::outs() << rso.str() << " " << fulltype << "\n";
if (rso.str() != fulltype) // Type* not match
continue;
if (i->first.second != *indice) // offset not match
continue;
//if (i->second == get_inst) // this gep_ins has been recorded before, by using the "addr" of store_ins
// continue;
match_value = i->second;
res.push_back(match_value);
}
return res;
};
void initCommonLibFunctions()
{
/// PostgreSQL's log functions.
CommonLibFunctions.push_back("errmsg");
CommonLibFunctions.push_back("elog_finish");
CommonLibFunctions.push_back("errdetail");
CommonLibFunctions.push_back("errcontext_msg");
CommonLibFunctions.push_back("write_stderr");
CommonLibFunctions.push_back("errdetail_plural");
CommonLibFunctions.push_back("errfinish");
CommonLibFunctions.push_back("errhint");
CommonLibFunctions.push_back("errmsg_internal");
/// glibc string functions.
CommonLibFunctions.push_back("snprintf");
CommonLibFunctions.push_back("psprintf");
/// Other functions?
CommonLibFunctions.push_back("appendStringInfo");
}
vector<pair<CallBase *, Function *> *> getCallerAndCallInst(Function *f)
{
if (!f)
llvm::outs() << "ERROR! Argument of `getCallerAndCallInst` should not be nullptr.\n";
vector<pair<CallBase *, Function *> *> res;
CallGraph *CG = new CallGraph(*M);
for (auto IT = bf_begin(CG), EI = bf_end(CG); IT != EI; IT++)
{
if (!IT->getFunction())
continue;
for (CallGraphNode::iterator calledNode_IT = IT->begin(); calledNode_IT != IT->end(); calledNode_IT++)
{
if (!calledNode_IT->first)
continue;
if (CallBase *cb = llvm::dyn_cast<CallBase>(calledNode_IT->first))
{
if (calledNode_IT->second->getFunction() && calledNode_IT->second->getFunction() == f)
res.push_back(new pair<CallBase *, Function *>(cb, IT->getFunction()));
}
else
{
llvm::outs() << "STRAGE. NOT a CallBase for the calledNode_IT->first" << getClassType(calledNode_IT->first) << "\n";
}
}
}
return res;
}
void printCallers(vector<pair<CallBase *, Function *> *> a, uint level)
{
for (vector<pair<CallBase *, Function *> *>::iterator i = a.begin(); i != a.end(); i++)
{
MY_DEBUG(_DEBUG_LEVEL, printTabs(level + 1));
MY_DEBUG(_DEBUG_LEVEL, llvm::outs() << "[" << getOriginalName((*i)->second->getName().str()) << "] ");
MY_DEBUG(_DEBUG_LEVEL, (*i)->first->print(llvm::outs()));
MY_DEBUG(_DEBUG_LEVEL, llvm::outs() << "\n");
}
}
vector<string> splitWithTag(string str, string tag)
{
vector<string> names;
while (str.find(tag) != string::npos)
{
names.push_back(str.substr(0, str.find(tag)));
str = str.substr(str.find(tag) + tag.length(), str.length() - str.find(tag) - tag.length());
}
names.push_back(str);
return names;
}
bool readConfigVariableNames(std::string var_file, std::vector<struct ConfigVariableNameInfo *> &config_names)
{
config_names.clear();
fstream fin(var_file.c_str(), ios::in);
if (!fin)
{
MY_DEBUG(_ERROR_LEVEL, llvm::outs() << "open var file failed.\n");
return false;
}
std::string buf_str;
while (getline(fin, buf_str))
{
if (buf_str == "")
continue;
std::istringstream iss(buf_str);
std::string type, var_name, origin_config_name, isDynConfig;
iss >> type >> var_name >> origin_config_name >> isDynConfig;
struct ConfigVariableNameInfo *config_name = new ConfigVariableNameInfo();
config_name->OriginalConfigName = origin_config_name;
if (type == "SINGLE")
{
config_name->VarType = SINGLE;
config_name->SingleName = var_name;
}
else if (type == "STRUCT")
{
config_name->VarType = STRUCT;
config_name->StructName = splitWithTag(var_name, ".");
}
else if (type == "CLASS")
{
config_name->VarType = CLASS;
config_name->ClassName = splitWithTag(var_name, "::");
}
else if (type == "FIELD")
{
config_name->VarType = FIELD;
config_name->FieldName = splitWithTag(var_name, ".");
}
config_name->DynamicConfigurableStatus = isDynConfig;
if (isDynConfig == "Yes" ||
isDynConfig == "user" ||
isDynConfig == "superuser" ||
isDynConfig == "backend" ||
isDynConfig == "superuser-backend" ||
isDynConfig == "sighup")
{
config_name->isDynamicConfigurable = true;
}
else if (isDynConfig == "No" ||
isDynConfig == "internal" ||
isDynConfig == "postmaster")
{
config_name->isDynamicConfigurable = false;
}
config_names.push_back(config_name);
}
fin.close();
MY_DEBUG(
_DEBUG_LEVEL,
llvm::outs() << "\n\n\n******************Output read in config name info:******************\n\n\n\n";
for (auto i = config_names.begin(), e = config_names.end(); i != e; i++) {
llvm::outs() << (*i)->getNameAsString() << "\n";
} llvm::outs()
<< "\n\n\n******************Output end******************\n\n\n\n";)
return true;
}
struct SrcLoc getSrcLoc(Instruction *inst)
{
string filename = "";
string dirname = "";
unsigned line = 0;
unsigned col = 0;
if (DILocation *Loc = inst->getDebugLoc())
{
line = Loc->getLine();
col = Loc->getColumn();
filename = Loc->getFilename();
dirname = Loc->getDirectory();
}
struct SrcLoc srcloc(filename, dirname, line, col);
return srcloc;
}
void remove_char(string &str, char ch)
{
for (auto it = str.begin(); it < str.end(); it++)
{
if (*it == ch)
{
str.erase(it);
it--;
}
}
}
string getStructTypeStrFromPrintAPI(Type *cur_type)
{
std::string str_buf;
llvm::raw_string_ostream rso(str_buf);
cur_type->print(rso);
std::string type_name = rso.str();
if (type_name.find("struct") == string::npos && type_name.find("class") == string::npos)
return "";
while (type_name.find("*") != string::npos)
{
remove_char(type_name, '*');
}
return type_name;
}
void printTabs(unsigned level)
{
for (unsigned i = 0; i < level; i++)
llvm::outs() << " ";
// llvm::outs()<<"\t";
}
string getClassType(Value *value)
{
if (llvm::isa<Argument>(value))
return "Argument";
else if (llvm::isa<BasicBlock>(value))
return "BasicBlock";
else if (llvm::isa<InlineAsm>(value))
return "InlineAsm";
else if (llvm::isa<MetadataAsValue>(value))
return "MetadataAsValue";
else if (llvm::isa<User>(value))
{
if (llvm::isa<Constant>(value))
{
if (llvm::isa<BlockAddress>(value))
return "User::Constant::BlockAddress";
else if (llvm::isa<ConstantAggregate>(value))
{
if (llvm::isa<ConstantArray>(value))
return "User::Constant::ConstantAggregate::ConstantArray";
else if (llvm::isa<ConstantStruct>(value))
return "User::Constant::ConstantAggregate::ConstantStruct";
else if (llvm::isa<ConstantVector>(value))
return "User::Constant::ConstantAggregate::ConstantVector";
else
return "User::Constant::ConstantAggregate";
}
else if (llvm::isa<ConstantData>(value))
{
if (llvm::isa<ConstantFP>(value))
return "User::Constant::ConstantData::ConstantFP";
else if (llvm::isa<ConstantInt>(value))
return "User::Constant::ConstantData::ConstantInt";
else if (llvm::isa<ConstantPointerNull>(value))
return "User::Constant::ConstantData::ConstantPointerNull";
else if (llvm::isa<ConstantTokenNone>(value))
return "User::Constant::ConstantData::ConstantTokenNone";
else
return "User::Constant::ConstantData";
}
else if (llvm::isa<ConstantExpr>(value))
{
return "User::Constant::ConstantExpr";
// if(llvm::isa<BinaryConstantExpr>(value))
// return "User::Constant::ConstantExpr::BinaryConstantExpr";
// else if(llvm::isa<CompareConstantExpr>(value))
// return "User::Constant::ConstantExpr::CompareConstantExpr";
// else if(llvm::isa<ExtractElementConstantExpr>(value))
// return "User::Constant::ConstantExpr::ExtractElementConstantExpr";
// else if(llvm::isa<ExtractValueConstantExpr>(value))
// return "User::Constant::ConstantExpr::ExtractValueConstantExpr";
// else if(llvm::isa<GetElementPtrConstantExpr>(value))
// return "User::Constant::ConstantExpr::GetElementPtrConstantExpr";
// else if(llvm::isa<InsertElementConstantExpr>(value))
// return "User::Constant::ConstantExpr::InsertElementConstantExpr";
// else if(llvm::isa<InsertValueConstantExpr>(value))
// return "User::Constant::ConstantExpr::InsertValueConstantExpr";
// else if(llvm::isa<SelectConstantExpr>(value))
// return "User::Constant::ConstantExpr::SelectConstantExpr";
// else if(llvm::isa<ShuffleVectorConstantExpr>(value))
// return "User::Constant::ConstantExpr::ShuffleVectorConstantExpr";
// else if(llvm::isa<UnaryConstantExpr>(value))
// return "User::Constant::ConstantExpr::UnaryConstantExpr";
// else
// return "User::Constant::ConstantExpr";
}
// else if(llvm::isa<DSOLocalEquivalent>(value))
// return "User::Constant::DSOLocalEquivalent";
else if (llvm::isa<GlobalValue>(value))
return "User::Constant::GlobalValue";
else
return "User::Constant";
}
else if (llvm::isa<DerivedUser>(value))
return "User::DerivedUser";
else if (Instruction *inst = llvm::dyn_cast<Instruction>(value))
return "User::Instruction::" + string(inst->getOpcodeName());
else if (llvm::isa<Operator>(value))
{
if (llvm::isa<BitCastOperator>(value))
return "User::Operator::BitCastOperator";
// else if(llvm::isa<AddrSpaceCastOperator>(value))
// return "User::Operator::AddrSpaceCastOperator";
else if (llvm::isa<GEPOperator>(value))
return "User::Operator::GEPOperator";
else if (llvm::isa<PtrToIntOperator>(value))
return "User::Operator::PtrToIntOperator";
else if (llvm::isa<ZExtOperator>(value))
return "User::Operator::ZExtOperator";
else if (llvm::isa<FPMathOperator>(value))
return "User::Operator::FPMathOperator";
else if (llvm::isa<OverflowingBinaryOperator>(value))
return "User::Operator::OverflowingBinaryOperator";
else if (llvm::isa<PossiblyExactOperator>(value))
return "User::Operator::PossiblyExactOperator";
else
return "User::Operator";
}
else
{
return "User";
}
}
else
{
return "Unknown";
}
}
string getAsString(Value *value)
{
std::string str_buf;
llvm::raw_string_ostream rso(str_buf);
value->print(rso);
std::string ret_str = rso.str();
while (ret_str[0] == ' ')
ret_str = ret_str.substr(1);
return ret_str;
}
vector<unsigned> getIndexFromGEPO(GEPOperator *gepo)
{
/*
This situation happends when handle on a array with index, like "tour[i] = tour[j];" in geqo_recombination.c:56;
%42 = getelementptr i32, i32* %39, i64 %41
or pointer offset, like, "OldestVisibleMXactId = OldestMemberMXactId + MaxOldestSlot;" in multixact.c:1857 in postgresql, where "OldestMemberMXactId" and "OldestVisibleMXactId" both are pointer of MultiXactId, a typedef of uint32 finally.
%80 = getelementptr i32, i32* %75, i64 %79
Since handling of config variables in structures seems not like this, so we don't consider it.
*/
vector<unsigned> vec;
for (unsigned i = 1; i < gepo->getNumOperands(); i++)
{
Value *op = gepo->getOperand(i);
if (ConstantInt *CI = dyn_cast<ConstantInt>(op))
{
uint64_t idx = CI->getZExtValue();
vec.push_back(idx);
}
else
{
vec.push_back(ERR_OORANGE);
}
}
return vec;
}
unsigned getFuncArgIndex(CallBase *call, Value *cur_value)
{
for (unsigned i = 0; i < call->getNumArgOperands(); i++)
{
Value *arg = call->getArgOperand(i);
if (arg == cur_value) // how to judge they are equal?
{
return i;
}
}
return ERR_OORANGE;
}
/// Demangle the function name
/// Input: mangling name
/// output: demangling name
string getOriginalName(string manglingName)
{
if (manglingName.empty())
return manglingName;
if (manglingName.find("\01_") != string::npos)
{
manglingName = manglingName.substr(manglingName.find('_') + 1);
}
string name;
int status;
char *realname;
realname = abi::__cxa_demangle(const_cast<char *>(manglingName.data()), 0, 0, &status);
if (!realname)
return manglingName;
name = realname;
name = name.substr(0, name.find_first_of('<'));
name = name.substr(0, name.find_first_of('('));
return name;
}
bool handleDIType(DIType *di_type,
std::vector<struct ConfigVariableNameInfo *> config_names,
GlobalVariable *gv,
std::vector<struct GlobalVariableInfo *> &gv_info_list,
unsigned config_names_idx,
vector<unsigned> offsets,
unsigned level)
{
if (!di_type)
return false;
bool ret_flag = false;
if (config_names_idx != ERR_OORANGE && level != ERR_OORANGE)
{
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "FullName: " << config_names[config_names_idx]->getNameAsString() << "\n");
if (level < config_names[config_names_idx]->StructName.size())
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "Current_name " << config_names[config_names_idx]->StructName[level] << "\n");
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "Offsets: ");
for (unsigned i = 0; i < offsets.size(); i++)
{
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << offsets[i] << " ");
}
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "\n");
}
if (DIBasicType *basic_type = dyn_cast<DIBasicType>(di_type))
{
if (config_names_idx != ERR_OORANGE && config_names[config_names_idx]->VarType != SINGLE)
{
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "Comes here 3\n");
ret_flag = true;
struct GlobalVariableInfo *gv_info = new GlobalVariableInfo(config_names[config_names_idx], gv, offsets);
gv_info_list.push_back(gv_info);
}
else
{
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "basic type gv name: " << gv->getName() << " -> " << getOriginalName(gv->getName()) << "\n");
for (unsigned i = 0; i < config_names.size(); i++)
{
if (config_names[i]->VarType == STRUCT)
continue;
if (getOriginalName(gv->getName().str()) == config_names[i]->SingleName)
{
ret_flag = true;
struct GlobalVariableInfo *gv_info = new GlobalVariableInfo(config_names[i], gv, offsets);
gv_info_list.push_back(gv_info);
}
}
}
}
else if (DIDerivedType *derived_type = dyn_cast<DIDerivedType>(di_type))
{
if (derived_type->getTag() == llvm::dwarf::DW_TAG_member)
{
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "In DIDerivedType - member tag\n");
if (config_names_idx == ERR_OORANGE || level == ERR_OORANGE)
return false;
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "Name : " << derived_type->getName() << "\n");
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "level : " << level << " size : " << config_names[config_names_idx]->StructName.size() << "\n");
if ((config_names[config_names_idx]->VarType == STRUCT &&
derived_type->getName().str() == config_names[config_names_idx]->StructName[level]) ||
(config_names[config_names_idx]->VarType == CLASS &&
derived_type->getName().str() == config_names[config_names_idx]->ClassName[level]))
{
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "Comes here 1\n");
if ((config_names[config_names_idx]->VarType == STRUCT &&
config_names[config_names_idx]->StructName.size() > level + 1) ||
(config_names[config_names_idx]->VarType == CLASS &&
config_names[config_names_idx]->ClassName.size() > level + 1))
{
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "Comes here 2\n");
DIType *di_type = derived_type->getBaseType();
return handleDIType(di_type, config_names, gv, gv_info_list, config_names_idx, offsets, level);
}
else
{
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "Comes here 3\n");
ret_flag = true;
struct GlobalVariableInfo *gv_info = new GlobalVariableInfo(config_names[config_names_idx], gv, offsets);
gv_info_list.push_back(gv_info);
}
}
}
else if (derived_type->getTag() == llvm::dwarf::DW_TAG_typedef ||
derived_type->getTag() == llvm::dwarf::DW_TAG_pointer_type ||
derived_type->getTag() == llvm::dwarf::DW_TAG_const_type ||
derived_type->getTag() == llvm::dwarf::DW_TAG_restrict_type || // seems not useful, but we still consider it.
derived_type->getTag() == llvm::dwarf::DW_TAG_atomic_type || // seems not useful, but we still consider it.
derived_type->getTag() == llvm::dwarf::DW_TAG_volatile_type)
{
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "In DIDerivedType - other tag\n");
DIType *type = derived_type->getBaseType();
return handleDIType(type, config_names, gv, gv_info_list, config_names_idx, offsets, level);
}
else
{
MY_DEBUG(_DEBUG_LEVEL, llvm::outs() << "Unhandled Tag in DIDerivedType: " << derived_type->getTag() << "\n");
}
}
else if (DICompositeType *compose_type = dyn_cast<DICompositeType>(di_type))
{
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "In DICompositeType\n");
if (compose_type->getTag() == llvm::dwarf::DW_TAG_structure_type)
{
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "struct type compose_type name: " << compose_type->getName() << "\n");
if (config_names_idx == ERR_OORANGE)
{
for (unsigned i = 0; i < config_names.size(); i++)
{
if (config_names[i]->VarType != STRUCT)
continue;
if (level == 0 && getOriginalName(compose_type->getName().str()) != config_names[i]->StructName[level])
continue;
unsigned offset = 0;
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "DW_TAG_structure_type elements size: " << compose_type->getElements().size() << "\n");
for (auto ite = compose_type->getElements().begin(); ite != compose_type->getElements().end(); ite++, offset++)
{
DINode *di_node = *ite;
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "Here we iterate the elements\n");
MY_DEBUG(_REDUNDENCY_LEVEL, di_node->print(llvm::outs()));
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "\n");
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "current offset = " << offset << "\n");
offsets.push_back(offset);
ret_flag = true;
if (isa<DIType>(di_node))
{
handleDIType(dyn_cast<DIType>(di_node), config_names, gv, gv_info_list, i, offsets, level + 1);
}
offsets.pop_back();
}
}
}
else
{
if (level == 0 && getOriginalName(compose_type->getName().str()) != config_names[config_names_idx]->StructName[level])
return ret_flag;
unsigned offset = 0;
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "DW_TAG_structure_type elements size: " << compose_type->getElements().size() << "\n");
for (auto ite = compose_type->getElements().begin(); ite != compose_type->getElements().end(); ite++, offset++)
{
DINode *di_node = *ite;
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "Here we iterate the elements\n");
MY_DEBUG(_REDUNDENCY_LEVEL, di_node->print(llvm::outs()));
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "\n");
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "current offset = " << offset << "\n");
offsets.push_back(offset);
ret_flag = true;
if (isa<DIType>(di_node))
{
handleDIType(dyn_cast<DIType>(di_node), config_names, gv, gv_info_list, config_names_idx, offsets, level + 1);
}
offsets.pop_back();
}
}
}
else if (compose_type->getTag() == llvm::dwarf::DW_TAG_class_type)
{
MY_DEBUG(_DEBUG_LEVEL, llvm::outs() << "class type compose_type name: " << compose_type->getName() << "\n");
for (unsigned i = 0; i < config_names.size(); i++)
{
if (config_names[i]->VarType != CLASS)
continue;
// MY_DEBUG( _DEBUG_LEVEL, llvm::outs()<<"config_name: "<<config_name.ClassName<<"::"<<config_name.FieldName<<"\n");
if (getOriginalName(compose_type->getName().str()) != config_names[i]->ClassName[level])
continue;
unsigned offset = 0;
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "DW_TAG_class_type elements size: " << compose_type->getElements().size() << "\n");
for (auto ite = compose_type->getElements().begin(), e = compose_type->getElements().end(); ite != e; ite++, offset++)
{
DINode *di_node = *ite;
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "Here we iterate the elements\n");
MY_DEBUG(_REDUNDENCY_LEVEL, di_node->print(llvm::outs()));
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "\n");
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "current offset = " << offset << "\n");
offsets.push_back(offset);
ret_flag = true;
if (isa<DIType>(di_node))
{
handleDIType(dyn_cast<DIType>(di_node), config_names, gv, gv_info_list, i, offsets, level + 1);
}
}
}
}
else if (compose_type->getTag() == llvm::dwarf::DW_TAG_enumeration_type)
{
MY_DEBUG(_DEBUG_LEVEL, llvm::outs() << "enum type compose_type name: " << compose_type->getName() << "\n");
DIType *base_type = compose_type->getBaseType();
handleDIType(base_type, config_names, gv, gv_info_list, config_names_idx, offsets, level);
}
else if (compose_type->getTag() == llvm::dwarf::DW_TAG_array_type)
{
DIType *base_type = compose_type->getBaseType();
handleDIType(base_type, config_names, gv, gv_info_list, config_names_idx, offsets, level);
}
}
return ret_flag;
}
/**
* @brief Find in if `gv` matches any one in the list `config_names`.
* If yes, new a `gv` and store it to `gv_info_list`
* CORE: struct GlobalVariableInfo* gv_info = new GlobalVariableInfo(config_names[config_names_idx], gv, offsets);
gv_info_list.push_back(gv_info);
*
* @param config_names
* @param gv
* @param gv_info_list
* @return true
* @return false
*/
bool findConfigVariable(std::vector<struct ConfigVariableNameInfo *> config_names,
GlobalVariable *gv,
std::vector<struct GlobalVariableInfo *> &gv_info_list)
{
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "Find whether it is a Config Variable.\n");
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "GlobalVariable:\n\t");
MY_DEBUG(_REDUNDENCY_LEVEL, gv->print(llvm::outs()));
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "\n");
// Usually DIGlobalVariableExpression only has 2 elements: a DIGlobalVariable and a DIExpression
SmallVector<DIGlobalVariableExpression *, 2> GVEs;
gv->getDebugInfo(GVEs);
if (GVEs.empty())
return false;
DIGlobalVariable *di_gv = GVEs[0]->getVariable();
vector<unsigned> offsets;
if (handleDIType(di_gv->getType(), config_names, gv, gv_info_list, ERR_OORANGE, offsets, 0))
return true;
return false;
}
void collectDFSReachableBB(vector<BasicBlock *> &children, BasicBlock *bb)
{
children.push_back(bb);
for (auto it = succ_begin(bb); it != succ_end(bb); ++it)
{
BasicBlock *succ = *it;
if (std::find(children.begin(), children.end(), succ) == children.end())
{
// children.push_back(succ);
collectDFSReachableBB(children, succ);
}
}
}
/** ===== Simple diff does not work here ====
* if(config) {
* xxxx;
* if(yy) {
* return;
* }
* }
* zzzz;
* ===========================================
*/
void collectBFSReachableBB(vector<BasicBlock *> &children, BasicBlock *bb){
queue<BasicBlock *> Q;
Q.push(bb);
while (!Q.empty())
{
BasicBlock *block = Q.front();
children.push_back(block);
for (auto it = succ_begin(block); it != succ_end(block); ++it)
{
BasicBlock *succ = *it;
// to find if `succ` already in Q (i.e., detect loop with 2-3 nodes)
bool searchFlag = false;
for (unsigned i = 0; i < Q.size(); ++i)
{
if (Q.front() == succ)
searchFlag = true;
// the only way to iterate the queue.
Q.push(Q.front());
Q.pop();
}
// to find if `succ` already in `children` (i.e., detect loop with 4-INF nodes)
if (std::find(children.begin(), children.end(), succ) != children.end())
searchFlag = true;
if (searchFlag == false)
Q.push(succ);
}
Q.pop();
}
}
void expandToAllReachableBB(vector<BasicBlock *> &childrens)
{
if (childrens.size() != 2 || childrens[0] == childrens[1])
{
llvm::outs() << "[ERROR] getOperand(0)/(1), num_op=" << childrens.size() << " (expected: 2), or something wrong here.\n";
return;
}
queue<BasicBlock *> Q;
Q.push(childrens[0]);
Q.push(childrens[1]);
while (!Q.empty())
{
BasicBlock *block = Q.front();
childrens.push_back(block);
for (auto it = succ_begin(block); it != succ_end(block); ++it)
{
BasicBlock *succ = *it;
bool searchFlag = false;
for (unsigned i = 0; i < Q.size(); ++i)
{
if (Q.front() == succ)
searchFlag = true;
Q.push(Q.front());
Q.pop();
}
// Detect loop.
// if(childrens.find(succ) != childrens.end())
if (std::find(childrens.begin(), childrens.end(), succ) != childrens.end())
searchFlag = true;
if (searchFlag == false)
Q.push(succ);
}
Q.pop();
}
}
void collectBFSReachableBB(vector<BasicBlock *> &children, BasicBlock *bb, BasicBlock *dest)
{
queue<BasicBlock *> Q;
Q.push(bb);
while (!Q.empty())
{
BasicBlock *block = Q.front();
children.push_back(block);
for (auto it = succ_begin(block); it != succ_end(block); ++it)
{
BasicBlock *succ = *it;
if (succ == dest)
continue;
bool searchFlag = false;
for (unsigned i = 0; i < Q.size(); ++i)
{
if (Q.front() == succ)
searchFlag = true;
Q.push(Q.front());
Q.pop();
}
if (std::find(children.begin(), children.end(), succ) != children.end())
searchFlag = true;
if (searchFlag == false)
Q.push(succ);
}
Q.pop();
}
}
/**
*
* Argument* arg = func_info->Ptr->getArg(func_info->ArgIndex);
* traceUser(arg, func_info, nullptr);
* @param cur_value ___| | |
* @param func_info __________| |
* @param prev_inst_info ________________|
*/
void traceUser(Value *cur_value, struct FuncInfo *func_info, struct InstInfo *prev_inst_info, uint level)
{
MY_DEBUG( _DEBUG_LEVEL, printTabs(level+1));
MY_DEBUG(_DEBUG_LEVEL, llvm::outs() << "[== " << __func__ << " ==]\n");
/**********************************************************************************************
** ____ llvm::GlobalValue ____ llvm::GlobalObject ___ llvm:Function
** /
** ____ llvm::Constant
** /
** llvm:Value --- llvm:User ------llvm::DerivedUser
** \ / \_____
** \ \ llvm::Instruction
** llvm:Argument \____
** llvm::Operator
**
********************************************************************************************/
vector<User *> UserVec = getSequenceUsers(cur_value);
unsigned user_ite_cnt = 0;
for (auto i = UserVec.rbegin(), e = UserVec.rend(); i != e; i++)
{
User *cur_user = *i;
MY_DEBUG(_WARNING_LEVEL, printTabs(level + 1));
MY_DEBUG(_WARNING_LEVEL, llvm::outs() << "Current User: level " << level << "\n");
MY_DEBUG(_WARNING_LEVEL, printTabs(level + 1));
MY_DEBUG(_WARNING_LEVEL, llvm::outs() << " ↳");
MY_DEBUG(_WARNING_LEVEL, cur_user->print(llvm::outs()));
if (isa<Instruction>(cur_user))
{
MY_DEBUG(_WARNING_LEVEL, llvm::outs() << "\t");
MY_DEBUG(_WARNING_LEVEL, llvm::outs() << getSrcLoc(dyn_cast<Instruction>(cur_user)).toString() << "\n");
}
else
{
MY_DEBUG(_WARNING_LEVEL, llvm::outs() << "\n");
}
if (Instruction *cur_inst = dyn_cast<Instruction>(cur_user))
{
if (prev_inst_info && cur_inst == prev_inst_info->InstPtr)
{
MY_DEBUG(_WARNING_LEVEL, llvm::outs() << "`Previous ins` == `Current ins`. Mostly because tracing user of *addr* of a storeIns: [" << getClassType(cur_inst) << "]\n");
continue;
}
struct SrcLoc srcloc = getSrcLoc(cur_inst);
struct InstInfo *inst_info = new InstInfo(cur_inst, srcloc);
/// NOTE: If current instruction is before the previous one
/// (within same function), we should not record.
if (prev_inst_info && comesBefore(inst_info->InstPtr, prev_inst_info->InstPtr))
{
continue;
}
/// NOTE: If the user is a continous StoreInst with same StoreAddr, we don't follow it.
if (prev_inst_info &&
isa<StoreInst>(prev_inst_info->InstPtr) &&
isa<StoreInst>(inst_info->InstPtr) &&
dyn_cast<StoreInst>(prev_inst_info->InstPtr)->getPointerOperand() ==
dyn_cast<StoreInst>(inst_info->InstPtr)->getPointerOperand())
{
MY_DEBUG(_WARNING_LEVEL, llvm::outs() << "Don't trace continuous StoreInst.\n");
continue;
}
/// NOTE: record visitedLSInst, since they are only one input and one output.
if (isa<StoreInst>(inst_info->InstPtr) || isa<LoadInst>(inst_info->InstPtr))
{
if (std::find(visitedLoadStoreInstList.begin(), visitedLoadStoreInstList.end(), inst_info->InstPtr) != visitedLoadStoreInstList.end())
{
MY_DEBUG(_WARNING_LEVEL, llvm::outs() << "Don't trace visited Load/Store Inst.\n");
continue;
}
}
/// Mark as visted
visitedLoadStoreInstList.push_back(inst_info->InstPtr);
/// add to the double linked list.
if (prev_inst_info == nullptr)
{
func_info->ArgInstInfoList.push_back(inst_info);
inst_info->Predecessor = nullptr;
}
else
{
if (findVisitedInstruction(inst_info, prev_inst_info))
{
MY_DEBUG(_WARNING_LEVEL, llvm::outs() << "This should not happen. Check me at line " << __LINE__ << "\n");
continue;
}
if (prev_inst_info->InfluenceLevel == WEAK)
inst_info->InfluenceLevel = WEAK;
prev_inst_info->Successors.push_back(inst_info);
inst_info->Predecessor = prev_inst_info;
}
/// NOTE: handle different instructions.
if (CallBase *call = dyn_cast<CallBase>(cur_inst))
{
Function *func = call->getCalledFunction();
/// IGNORE: function pointer.
if (func == nullptr)
continue;
/// IGNORE: Debug-generated intrinsic functions, e.g. llvm.dbg.declare().
if (func->isIntrinsic())
continue;
/// IGNORE: recursive calling
if (func == func_info->Ptr)
continue;
/*
* Make this callInst into a `FuncInfo`
*/
string func_name = getOriginalName(func->getName());
unsigned arg_index = getFuncArgIndex(call, cur_value);
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "Function Name : " << func_name << "\n");
MY_DEBUG(_REDUNDENCY_LEVEL, llvm::outs() << "Output: current Arg Index is : " << arg_index << "\n");
struct FuncInfo *new_func_info = new FuncInfo(func, func_name, arg_index, inst_info->InstLoc.toString());
unsigned index = isFuncInfoRecorded(new_func_info, func_info->InsideFuncInfoList);
if (index == ERR_OORANGE)
{
func_info->InsideFuncInfoList.push_back(new_func_info);
}
else
{
new_func_info = func_info->InsideFuncInfoList[index];
new_func_info->CallLocList.push_back(inst_info->InstLoc.toString());
}
/// IGNORE: lib function.
if (std::find(CommonLibFunctions.begin(), CommonLibFunctions.end(), func_name) != CommonLibFunctions.end())
continue;
/// IGNORE: If this Function has variable arguments' number, maybe we don't need to follow.