LLVMModule.h

Go to the documentation of this file.

//===- LLVMModule.h -- LLVM Module class-----------------------------------------//
//
//                     SVF: Static Value-Flow Analysis
//
// Copyright (C) <2013->  <Yulei Sui>
//
 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
 
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
//===----------------------------------------------------------------------===//
 
/*
 * LLVMModule.h
 *
 *  Created on: 23 Mar.2020
 *      Author: Yulei Sui
 */
 
#ifndef INCLUDE_SVF_FE_LLVMMODULE_H_
#define INCLUDE_SVF_FE_LLVMMODULE_H_
 
#include "SVF-LLVM/BasicTypes.h"
#include "Util/Options.h"
#include "Graphs/BasicBlockG.h"
 
namespace SVF
{
 
class ObjTypeInference;
 
class LLVMModuleSet
{
    friend class SVFIRBuilder;
    friend class ICFGBuilder;
    friend class SymbolTableBuilder;
 
public:
 
    typedef std::vector<const Function*> FunctionSetType;
    typedef Map<const Function*, const Function*> FunDeclToDefMapTy;
    typedef Map<const Function*, FunctionSetType> FunDefToDeclsMapTy;
    typedef Map<const GlobalVariable*, GlobalVariable*> GlobalDefToRepMapTy;
 
    typedef Map<const Function*, FunObjVar*> LLVMFun2FunObjVarMap;
    typedef Map<const BasicBlock*, SVFBasicBlock*> LLVMBB2SVFBBMap;
    typedef Map<const SVFValue*, const Value*> SVFBaseNode2LLVMValueMap;
    typedef Map<const Type*, SVFType*> LLVMType2SVFTypeMap;
    typedef Map<const Type*, StInfo*> Type2TypeInfoMap;
    typedef Map<std::string, std::vector<std::string>> Fun2AnnoMap;
 
    typedef Map<const Instruction*, CallICFGNode *> CSToCallNodeMapTy;
    typedef Map<const Instruction*, RetICFGNode *> CSToRetNodeMapTy;
    typedef Map<const Instruction*, IntraICFGNode *> InstToBlockNodeMapTy;
    typedef Map<const Function*, FunEntryICFGNode *> FunToFunEntryNodeMapTy;
    typedef Map<const Function*, FunExitICFGNode *> FunToFunExitNodeMapTy;
 
    typedef OrderedMap<const Value*, NodeID> ValueToIDMapTy;
 
    typedef OrderedMap<const Function*, NodeID> FunToIDMapTy;
 
    typedef std::vector<const Function*> FunctionSet;
    typedef Map<const Function*, const BasicBlock*> FunToExitBBMap;
    typedef Map<const Function*, const Function *> FunToRealDefFunMap;
 
private:
    static LLVMModuleSet* llvmModuleSet;
    static bool preProcessed;
    SVFIR* svfir;
    std::unique_ptr<LLVMContext> owned_ctx;
    std::vector<std::unique_ptr<Module>> owned_modules;
    std::vector<std::reference_wrapper<Module>> modules;
 
    FunctionSetType ExtFuncsVec;
    Fun2AnnoMap ExtFun2Annotations;
 
    // Map SVFFunction to its annotations
    Map<const Function*, std::vector<std::string>> func2Annotations;
 
    GlobalDefToRepMapTy GlobalDefToRepMap;
 
    LLVMFun2FunObjVarMap LLVMFun2FunObjVar; 
    LLVMBB2SVFBBMap LLVMBB2SVFBB;
    LLVMType2SVFTypeMap LLVMType2SVFType;
    Type2TypeInfoMap Type2TypeInfo;
    ObjTypeInference* typeInference;
 
    SVFBaseNode2LLVMValueMap SVFBaseNode2LLVMValue;
    CSToCallNodeMapTy CSToCallNodeMap; 
    CSToRetNodeMapTy CSToRetNodeMap; 
    InstToBlockNodeMapTy InstToBlockNodeMap; 
    FunToFunEntryNodeMapTy FunToFunEntryNodeMap; 
    FunToFunExitNodeMapTy FunToFunExitNodeMap; 
 
    Map<const Function*, DominatorTree> FunToDominatorTree;
 
    ValueToIDMapTy valSymMap;  
    ValueToIDMapTy objSymMap;  
    FunToIDMapTy returnSymMap; 
    FunToIDMapTy varargSymMap; 
 
    FunctionSet funSet;
    FunToExitBBMap funToExitBB;
    FunToRealDefFunMap funToRealDefFun;
 
    LLVMModuleSet();
 
    void build();
 
public:
    ~LLVMModuleSet();
 
    static inline LLVMModuleSet* getLLVMModuleSet()
    {
        if (!llvmModuleSet)
            llvmModuleSet = new LLVMModuleSet;
        return llvmModuleSet;
    }
 
    static void releaseLLVMModuleSet()
    {
        delete llvmModuleSet;
        llvmModuleSet = nullptr;
    }
 
    // Build an SVF module from a given LLVM Module instance (for use e.g. in a LLVM pass)
    static void buildSVFModule(Module& mod);
 
    // Build an SVF module from the bitcode files provided in `moduleNameVec`
    static void buildSVFModule(const std::vector<std::string>& moduleNameVec);
 
    static void preProcessBCs(std::vector<std::string>& moduleNameVec);
 
    u32_t getModuleNum() const
    {
        return modules.size();
    }
 
    const std::vector<std::reference_wrapper<Module>>& getLLVMModules() const
    {
        return modules;
    }
 
    Module *getModule(u32_t idx) const
    {
        return &getModuleRef(idx);
    }
 
    Module &getModuleRef(u32_t idx) const
    {
        assert(idx < getModuleNum() && "Out of range.");
        return modules[idx];
    }
 
    // Dump modules to files
    void dumpModulesToFile(const std::string& suffix);
 
public:
 
    inline const BasicBlock* getFunExitBB(const Function* fun) const
    {
        auto it = funToExitBB.find(fun);
        if (it == funToExitBB.end()) return nullptr;
        else return it->second;
    }
 
    inline const Function* getRealDefFun(const Function* fun) const
    {
        auto it = funToRealDefFun.find(fun);
        if (it == funToRealDefFun.end()) return nullptr;
        else return it->second;
    }
 
    inline const FunctionSet& getFunctionSet() const
    {
        return funSet;
    }
 
    inline u32_t getValueNodeNum() const
    {
        return valSymMap.size();
    }
 
    inline u32_t getObjNodeNum() const
    {
        return objSymMap.size();
    }
 
    inline ValueToIDMapTy& valSyms()
    {
        return valSymMap;
    }
 
    inline ValueToIDMapTy& objSyms()
    {
        return objSymMap;
    }
 
    NodeID getValueNode(const Value* V);
 
    bool hasValueNode(const Value* V);
 
    NodeID getObjectNode(const Value* V);
 
    void dumpSymTable();
 
public:
 
    // create a SVFBasicBlock according to LLVM BasicBlock, then add it to SVFFunction's BasicBlockGraph
    inline void addBasicBlock(FunObjVar* fun, const BasicBlock* bb)
    {
        SVFBasicBlock* svfBB = fun->getBasicBlockGraph()->addBasicBlock(bb->getName().str());
        LLVMBB2SVFBB[bb] = svfBB;
        SVFBaseNode2LLVMValue[svfBB] = bb;
    }
 
    inline void addInstructionMap(const Instruction* inst, CallICFGNode* svfInst)
    {
        CSToCallNodeMap[inst] = svfInst;
        addToSVFVar2LLVMValueMap(inst, svfInst);
    }
    inline void addInstructionMap(const Instruction* inst, RetICFGNode* svfInst)
    {
        CSToRetNodeMap[inst] = svfInst;
        addToSVFVar2LLVMValueMap(inst, svfInst);
    }
    inline void addInstructionMap(const Instruction* inst, IntraICFGNode* svfInst)
    {
        InstToBlockNodeMap[inst] = svfInst;
        addToSVFVar2LLVMValueMap(inst, svfInst);
    }
 
    const Value* getLLVMValue(const SVFValue* value) const
    {
        SVFBaseNode2LLVMValueMap ::const_iterator it = SVFBaseNode2LLVMValue.find(value);
        assert(it != SVFBaseNode2LLVMValue.end() && "can't find corresponding llvm value!");
        return it->second;
    }
 
    inline const FunObjVar* getFunObjVar(const Function* fun) const
    {
        LLVMFun2FunObjVarMap::const_iterator it = LLVMFun2FunObjVar.find(fun);
        assert(it!=LLVMFun2FunObjVar.end() && "SVF Function not found!");
        return it->second;
    }
 
    inline FunToIDMapTy& retSyms()
    {
        return returnSymMap;
    }
 
    inline FunToIDMapTy& varargSyms()
    {
        return varargSymMap;
    }
 
    NodeID getReturnNode(const Function *func) const
    {
        FunToIDMapTy::const_iterator iter =  returnSymMap.find(func);
        assert(iter!=returnSymMap.end() && "ret sym not found");
        return iter->second;
    }
 
    NodeID getVarargNode(const Function *func) const
    {
        FunToIDMapTy::const_iterator iter =  varargSymMap.find(func);
        assert(iter!=varargSymMap.end() && "vararg sym not found");
        return iter->second;
    }
 
    SVFBasicBlock* getSVFBasicBlock(const BasicBlock* bb)
    {
        LLVMBB2SVFBBMap::const_iterator it = LLVMBB2SVFBB.find(bb);
        assert(it!=LLVMBB2SVFBB.end() && "SVF BasicBlock not found!");
        return it->second;
    }
 
    inline const Function* getFunction(const std::string& name)
    {
        Function* fun = nullptr;
 
        for (u32_t i = 0; i < llvmModuleSet->getModuleNum(); ++i)
        {
            Module* mod = llvmModuleSet->getModule(i);
            fun = mod->getFunction(name);
            if (fun)
            {
                return fun;
            }
        }
        return nullptr;
    }
 
    const FunObjVar* getFunObjVar(const std::string& name);
 
    ICFGNode* getICFGNode(const Instruction* inst);
 
    bool hasICFGNode(const Instruction* inst);
 
    CallICFGNode* getCallICFGNode(const Instruction*  cs);
    RetICFGNode* getRetICFGNode(const Instruction*  cs);
    IntraICFGNode* getIntraICFGNode(const Instruction* inst);
 
    inline FunEntryICFGNode* getFunEntryICFGNode(const Function*  fun)
    {
        FunEntryICFGNode* b = getFunEntryBlock(fun);
        assert(b && "Function entry not created?");
        return b;
    }
    inline FunExitICFGNode* getFunExitICFGNode(const Function*  fun)
    {
        FunExitICFGNode* b = getFunExitBlock(fun);
        assert(b && "Function exit not created?");
        return b;
    }
 
 
    bool hasGlobalRep(const GlobalVariable* val) const
    {
        GlobalDefToRepMapTy::const_iterator it = GlobalDefToRepMap.find(val);
        return it != GlobalDefToRepMap.end();
    }
 
    GlobalVariable *getGlobalRep(const GlobalVariable* val) const
    {
        GlobalDefToRepMapTy::const_iterator it = GlobalDefToRepMap.find(val);
        assert(it != GlobalDefToRepMap.end() && "has no rep?");
        return it->second;
    }
 
    Module* getMainLLVMModule() const
    {
        assert(!empty() && "empty LLVM module!!");
        for (size_t i = 0; i < getModuleNum(); ++i)
        {
            Module& module = getModuleRef(i);
            if (module.getName().str() != ExtAPI::getExtAPI()->getExtBcPath())
            {
                return &module;
            }
        }
        assert(false && "no main module found!");
        return nullptr;
    }
 
    LLVMContext& getContext() const
    {
        assert(!empty() && "empty LLVM module!!");
        return getMainLLVMModule()->getContext();
    }
 
    bool empty() const
    {
        return getModuleNum() == 0;
    }
 
    SVFType* getSVFType(const Type* T);
    const Type* getLLVMType(const SVFType* T) const;
 
    ObjTypeInference* getTypeInference();
 
    DominatorTree& getDomTree(const Function* fun);
 
    std::string getExtFuncAnnotation(const Function* fun, const std::string& funcAnnotation);
 
    const std::vector<std::string>& getExtFuncAnnotations(const Function* fun);
 
    // Does (F) have some annotation?
    bool hasExtFuncAnnotation(const Function* fun, const std::string& funcAnnotation);
 
    // Does (F) have a static var X (unavailable to us) that its return points to?
    bool has_static(const Function *F);
 
    // Does (F) have a memcpy_like operation?
    bool is_memcpy(const Function *F);
 
    // Does (F) have a memset_like operation?
    bool is_memset(const Function *F);
 
    // Does (F) allocate a new object and return it?
    bool is_alloc(const Function *F);
 
    // Does (F) allocate a new object and assign it to one of its arguments?
    bool is_arg_alloc(const Function *F);
 
    // Does (F) allocate a new stack object and return it?
    bool is_alloc_stack_ret(const Function *F);
 
    // Get the position of argument which holds the new object
    s32_t get_alloc_arg_pos(const Function *F);
 
    // Does (F) reallocate a new object?
    bool is_realloc(const Function *F);
 
    // Should (F) be considered "external" (either not defined in the program
    //   or a user-defined version of a known alloc or no-op)?
    bool is_ext(const Function *F);
 
    // Set the annotation of (F)
    void setExtFuncAnnotations(const Function* fun, const std::vector<std::string>& funcAnnotations);
 
private:
    inline void addFunctionSet(const Function* svfFunc)
    {
        funSet.push_back(svfFunc);
    }
 
    inline void setFunExitBB(const Function* fun, const BasicBlock* bb)
    {
        funToExitBB[fun] = bb;
    }
 
    inline void setFunRealDefFun(const Function* fun, const Function* realDefFun)
    {
        funToRealDefFun[fun] = realDefFun;
    }
    SVFType* addSVFTypeInfo(const Type* t);
    StInfo* collectTypeInfo(const Type* ty);
    StInfo* collectStructInfo(const StructType* structTy, u32_t& numFields);
    StInfo* collectArrayInfo(const ArrayType* T);
    StInfo* collectSimpleTypeInfo(const Type* T);
 
    std::vector<const Function*> getLLVMGlobalFunctions(const GlobalVariable* global);
 
    void loadModules(const std::vector<std::string>& moduleNameVec);
    // Loads ExtAPI bitcode file; uses LLVMContext made while loading module bitcode files or from Module
    void loadExtAPIModules();
    void addSVFMain();
 
    void createSVFDataStructure();
 
    void addToSVFVar2LLVMValueMap(const Value* val, SVFValue* svfBaseNode);
    void buildFunToFunMap();
    void buildGlobalDefToRepMap();
    void prePassSchedule();
    void buildSymbolTable() const;
    void collectExtFunAnnotations(const Module* mod);
 
    inline CallICFGNode* getCallBlock(const Instruction* cs)
    {
        CSToCallNodeMapTy::const_iterator it = CSToCallNodeMap.find(cs);
        if (it == CSToCallNodeMap.end())
            return nullptr;
        return it->second;
    }
 
    inline RetICFGNode* getRetBlock(const Instruction* cs)
    {
        CSToRetNodeMapTy::const_iterator it = CSToRetNodeMap.find(cs);
        if (it == CSToRetNodeMap.end())
            return nullptr;
        return it->second;
    }
 
    inline IntraICFGNode* getIntraBlock(const Instruction* inst)
    {
        InstToBlockNodeMapTy::const_iterator it = InstToBlockNodeMap.find(inst);
        if (it == InstToBlockNodeMap.end())
            return nullptr;
        return it->second;
    }
 
    inline FunEntryICFGNode* getFunEntryBlock(const Function* fun)
    {
        FunToFunEntryNodeMapTy::const_iterator it = FunToFunEntryNodeMap.find(fun);
        if (it == FunToFunEntryNodeMap.end())
            return nullptr;
        return it->second;
    }
 
    inline FunExitICFGNode* getFunExitBlock(const Function* fun)
    {
        FunToFunExitNodeMapTy::const_iterator it = FunToFunExitNodeMap.find(fun);
        if (it == FunToFunExitNodeMap.end())
            return nullptr;
        return it->second;
    }
};
 
} // End namespace SVF
 
#endif /* INCLUDE_SVF_FE_LLVMMODULE_H_ */