SVFValue.h

Go to the documentation of this file.

//===- BasicTypes.h -- Basic types used in SVF-------------------------------//
//
//                     SVF: Static Value-Flow Analysis
//
// Copyright (C) <2013-2017>  <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/>.
//
//===----------------------------------------------------------------------===//
 
/*
 * BasicTypes.h
 *
 *  Created on: Apr 1, 2014
 *      Author: Yulei Sui
 */
 
#ifndef INCLUDE_SVFIR_SVFVALUE_H_
#define INCLUDE_SVFIR_SVFVALUE_H_
 
#include "SVFIR/SVFType.h"
#include "Graphs/GraphPrinter.h"
#include "Util/Casting.h"
 
namespace SVF
{
 
typedef SVF::GraphPrinter GraphPrinter;
 
class CallGraphNode;
class SVFInstruction;
class SVFBasicBlock;
class SVFArgument;
class SVFFunction;
class SVFType;
 
class SVFLoopAndDomInfo
{
    friend class SVFIRWriter;
    friend class SVFIRReader;
public:
    typedef Set<const SVFBasicBlock*> BBSet;
    typedef std::vector<const SVFBasicBlock*> BBList;
    typedef BBList LoopBBs;
 
private:
    BBList reachableBBs;    
    Map<const SVFBasicBlock*,BBSet> dtBBsMap;   
    Map<const SVFBasicBlock*,BBSet> pdtBBsMap;   
    Map<const SVFBasicBlock*,BBSet> dfBBsMap;    
    Map<const SVFBasicBlock*, LoopBBs> bb2LoopMap;  
    Map<const SVFBasicBlock*, u32_t> bb2PdomLevel;  
    Map<const SVFBasicBlock*, const SVFBasicBlock*> bb2PIdom;  
 
public:
    SVFLoopAndDomInfo()
    {
    }
 
    virtual ~SVFLoopAndDomInfo() {}
 
    inline const Map<const SVFBasicBlock*,BBSet>& getDomFrontierMap() const
    {
        return dfBBsMap;
    }
 
    inline Map<const SVFBasicBlock*,BBSet>& getDomFrontierMap()
    {
        return dfBBsMap;
    }
 
    inline bool hasLoopInfo(const SVFBasicBlock* bb) const
    {
        return bb2LoopMap.find(bb) != bb2LoopMap.end();
    }
 
    const LoopBBs& getLoopInfo(const SVFBasicBlock* bb) const;
 
    inline const SVFBasicBlock* getLoopHeader(const LoopBBs& lp) const
    {
        assert(!lp.empty() && "this is not a loop, empty basic block");
        return lp.front();
    }
 
    inline bool loopContainsBB(const LoopBBs& lp, const SVFBasicBlock* bb) const
    {
        return std::find(lp.begin(), lp.end(), bb) != lp.end();
    }
 
    inline void addToBB2LoopMap(const SVFBasicBlock* bb, const SVFBasicBlock* loopBB)
    {
        bb2LoopMap[bb].push_back(loopBB);
    }
 
    inline const Map<const SVFBasicBlock*,BBSet>& getPostDomTreeMap() const
    {
        return pdtBBsMap;
    }
 
    inline Map<const SVFBasicBlock*,BBSet>& getPostDomTreeMap()
    {
        return pdtBBsMap;
    }
 
    inline const Map<const SVFBasicBlock*,u32_t>& getBBPDomLevel() const
    {
        return bb2PdomLevel;
    }
 
    inline Map<const SVFBasicBlock*,u32_t>& getBBPDomLevel()
    {
        return bb2PdomLevel;
    }
 
    inline const Map<const SVFBasicBlock*,const SVFBasicBlock*>& getBB2PIdom() const
    {
        return bb2PIdom;
    }
 
    inline Map<const SVFBasicBlock*,const SVFBasicBlock*>& getBB2PIdom()
    {
        return bb2PIdom;
    }
 
 
    inline Map<const SVFBasicBlock*,BBSet>& getDomTreeMap()
    {
        return dtBBsMap;
    }
 
    inline const Map<const SVFBasicBlock*,BBSet>& getDomTreeMap() const
    {
        return dtBBsMap;
    }
 
    inline bool isUnreachable(const SVFBasicBlock* bb) const
    {
        return std::find(reachableBBs.begin(), reachableBBs.end(), bb) ==
               reachableBBs.end();
    }
 
    inline const BBList& getReachableBBs() const
    {
        return reachableBBs;
    }
 
    inline void setReachableBBs(BBList& bbs)
    {
        reachableBBs = bbs;
    }
 
    void getExitBlocksOfLoop(const SVFBasicBlock* bb, BBList& exitbbs) const;
 
    bool isLoopHeader(const SVFBasicBlock* bb) const;
 
    bool dominate(const SVFBasicBlock* bbKey, const SVFBasicBlock* bbValue) const;
 
    bool postDominate(const SVFBasicBlock* bbKey, const SVFBasicBlock* bbValue) const;
 
    const SVFBasicBlock *findNearestCommonPDominator(const SVFBasicBlock *A, const SVFBasicBlock *B) const;
};
 
class SVFValue
{
    friend class SVFIRWriter;
    friend class SVFIRReader;
    friend class LLVMModuleSet;
 
public:
    typedef s64_t GNodeK;
 
    enum SVFValKind
    {
        SVFVal,
        SVFFunc,
        SVFBB,
        SVFInst,
        SVFCall,
        SVFVCall,
        SVFGlob,
        SVFArg,
        SVFConst,
        SVFConstData,
        SVFConstInt,
        SVFConstFP,
        SVFNullPtr,
        SVFBlackHole,
        SVFMetaAsValue,
        SVFOther
    };
 
private:
    GNodeK kind;    
    bool ptrInUncalledFun;  
    bool constDataOrAggData;    
 
protected:
    const SVFType* type;   
    std::string name;       
    std::string sourceLoc;  
    SVFValue(const SVFType* ty, SVFValKind k)
        : kind(k), ptrInUncalledFun(false),
          constDataOrAggData(SVFConstData == k), type(ty), sourceLoc("NoLoc")
    {
    }
 
    inline void setConstDataOrAggData()
    {
        constDataOrAggData = true;
    }
    inline void setPtrInUncalledFunction()
    {
        ptrInUncalledFun = true;
    }
public:
    SVFValue() = delete;
    virtual ~SVFValue() = default;
 
    inline GNodeK getKind() const
    {
        return kind;
    }
 
    inline const std::string &getName() const
    {
        return name;
    }
    inline void setName(const std::string& n)
    {
        name = n;
    }
    inline void setName(std::string&& n)
    {
        name = std::move(n);
    }
 
    inline virtual const SVFType* getType() const
    {
        return type;
    }
    inline bool isConstDataOrAggData() const
    {
        return constDataOrAggData;
    }
    inline bool ptrInUncalledFunction() const
    {
        return ptrInUncalledFun;
    }
    inline bool isblackHole() const
    {
        return getKind() == SVFBlackHole;;
    }
    inline bool isNullPtr() const
    {
        return getKind() == SVFNullPtr;
    }
    inline virtual void setSourceLoc(const std::string& sourceCodeInfo)
    {
        sourceLoc = sourceCodeInfo;
    }
    inline virtual const std::string getSourceLoc() const
    {
        return sourceLoc;
    }
 
    std::string toString() const;
 
 
    friend OutStream& operator<<(OutStream &os, const SVFValue &value)
    {
        return os << value.toString();
    }
};
 
class SVFFunction : public SVFValue
{
    friend class LLVMModuleSet;
    friend class SVFIRWriter;
    friend class SVFIRReader;
    friend class SVFIRBuilder;
 
public:
    typedef std::vector<const SVFBasicBlock*>::const_iterator const_iterator;
    typedef SVFLoopAndDomInfo::BBSet BBSet;
    typedef SVFLoopAndDomInfo::BBList BBList;
    typedef SVFLoopAndDomInfo::LoopBBs LoopBBs;
 
private:
    bool isDecl;   
    bool intrinsic; 
    bool addrTaken; 
    bool isUncalled;    
    bool isNotRet;   
    bool varArg;    
    const SVFFunctionType* funcType; 
    SVFLoopAndDomInfo* loopAndDom;  
    const SVFFunction* realDefFun;  
    std::vector<const SVFBasicBlock*> allBBs;   
    std::vector<const SVFArgument*> allArgs;    
    SVFBasicBlock *exitBlock;             
    const CallGraphNode *callGraphNode;          
 
protected:
    inline void setCallGraphNode(CallGraphNode *cgn)
    {
        callGraphNode = cgn;
    }
 
    inline void addBasicBlock(const SVFBasicBlock* bb)
    {
        allBBs.push_back(bb);
    }
 
    inline void addArgument(SVFArgument* arg)
    {
        allArgs.push_back(arg);
    }
 
    inline void setIsUncalledFunction(bool uncalledFunction)
    {
        isUncalled = uncalledFunction;
    }
 
    inline void setIsNotRet(bool notRet)
    {
        isNotRet = notRet;
    }
 
    inline void setDefFunForMultipleModule(const SVFFunction* deffun)
    {
        realDefFun = deffun;
    }
 
public:
    SVFFunction(const SVFType* ty,const SVFFunctionType* ft, bool declare, bool intrinsic, bool addrTaken, bool varg, SVFLoopAndDomInfo* ld);
    SVFFunction(void) = delete;
    virtual ~SVFFunction();
 
    inline const CallGraphNode* getCallGraphNode() const
    {
        return callGraphNode;
    }
 
    static inline bool classof(const SVFValue *node)
    {
        return node->getKind() == SVFFunc;
    }
 
    inline SVFLoopAndDomInfo* getLoopAndDomInfo()
    {
        return loopAndDom;
    }
    inline bool isDeclaration() const
    {
        return isDecl;
    }
 
    inline bool isIntrinsic() const
    {
        return intrinsic;
    }
 
    inline bool hasAddressTaken() const
    {
        return addrTaken;
    }
 
    inline const SVFFunctionType* getFunctionType() const
    {
        return funcType;
    }
 
    inline const SVFType* getReturnType() const
    {
        return funcType->getReturnType();
    }
 
    inline const SVFFunction* getDefFunForMultipleModule() const
    {
        if(realDefFun==nullptr)
            return this;
        return realDefFun;
    }
 
    u32_t arg_size() const;
    const SVFArgument* getArg(u32_t idx) const;
    bool isVarArg() const;
 
    inline bool hasBasicBlock() const
    {
        return !allBBs.empty();
    }
 
    inline const SVFBasicBlock* getEntryBlock() const
    {
        assert(hasBasicBlock() && "function does not have any Basicblock, external function?");
        return allBBs.front();
    }
 
    const SVFBasicBlock* getExitBB() const;
 
    void setExitBlock(SVFBasicBlock *bb);
 
    inline const SVFBasicBlock* front() const
    {
        return getEntryBlock();
    }
 
    inline const SVFBasicBlock* back() const
    {
        assert(hasBasicBlock() && "function does not have any Basicblock, external function?");
        return allBBs.back();
    }
 
    inline const_iterator begin() const
    {
        return allBBs.begin();
    }
 
    inline const_iterator end() const
    {
        return allBBs.end();
    }
 
    inline const std::vector<const SVFBasicBlock*>& getBasicBlockList() const
    {
        return allBBs;
    }
 
    inline const std::vector<const SVFBasicBlock*>& getReachableBBs() const
    {
        return loopAndDom->getReachableBBs();
    }
 
    inline bool isUncalledFunction() const
    {
        return isUncalled;
    }
 
    inline bool hasReturn() const
    {
        return  !isNotRet;
    }
 
    inline void getExitBlocksOfLoop(const SVFBasicBlock* bb, BBList& exitbbs) const
    {
        return loopAndDom->getExitBlocksOfLoop(bb,exitbbs);
    }
 
    inline bool hasLoopInfo(const SVFBasicBlock* bb) const
    {
        return loopAndDom->hasLoopInfo(bb);
    }
 
    const LoopBBs& getLoopInfo(const SVFBasicBlock* bb) const
    {
        return loopAndDom->getLoopInfo(bb);
    }
 
    inline const SVFBasicBlock* getLoopHeader(const BBList& lp) const
    {
        return loopAndDom->getLoopHeader(lp);
    }
 
    inline bool loopContainsBB(const BBList& lp, const SVFBasicBlock* bb) const
    {
        return loopAndDom->loopContainsBB(lp,bb);
    }
 
    inline const Map<const SVFBasicBlock*,BBSet>& getDomTreeMap() const
    {
        return loopAndDom->getDomTreeMap();
    }
 
    inline const Map<const SVFBasicBlock*,BBSet>& getDomFrontierMap() const
    {
        return loopAndDom->getDomFrontierMap();
    }
 
    inline bool isLoopHeader(const SVFBasicBlock* bb) const
    {
        return loopAndDom->isLoopHeader(bb);
    }
 
    inline bool dominate(const SVFBasicBlock* bbKey, const SVFBasicBlock* bbValue) const
    {
        return loopAndDom->dominate(bbKey,bbValue);
    }
 
    inline bool postDominate(const SVFBasicBlock* bbKey, const SVFBasicBlock* bbValue) const
    {
        return loopAndDom->postDominate(bbKey,bbValue);
    }
};
 
class ICFGNode;
 
class SVFBasicBlock : public SVFValue
{
    friend class LLVMModuleSet;
    friend class SVFIRWriter;
    friend class SVFIRReader;
    friend class SVFIRBuilder;
    friend class SVFFunction;
    friend class ICFGBuilder;
    friend class ICFG;
 
public:
    typedef std::vector<const ICFGNode*>::const_iterator const_iterator;
 
private:
    std::vector<const ICFGNode*> allICFGNodes;    
    std::vector<const SVFBasicBlock*> succBBs;  
    std::vector<const SVFBasicBlock*> predBBs;  
    const SVFFunction* fun;                 
 
protected:
 
    inline void addICFGNode(const ICFGNode* icfgNode)
    {
        assert(std::find(getICFGNodeList().begin(), getICFGNodeList().end(),
                         icfgNode) == getICFGNodeList().end() && "duplicated icfgnode");
        allICFGNodes.push_back(icfgNode);
    }
 
    inline void addSuccBasicBlock(const SVFBasicBlock* succ)
    {
        succBBs.push_back(succ);
    }
 
    inline void addPredBasicBlock(const SVFBasicBlock* pred)
    {
        predBBs.push_back(pred);
    }
 
public:
    SVFBasicBlock(const SVFType* ty, const SVFFunction* f);
    SVFBasicBlock() = delete;
    ~SVFBasicBlock() override;
 
    static inline bool classof(const SVFValue *node)
    {
        return node->getKind() == SVFBB;
    }
 
    inline const std::vector<const ICFGNode*>& getICFGNodeList() const
    {
        return allICFGNodes;
    }
 
    inline const_iterator begin() const
    {
        return allICFGNodes.begin();
    }
 
    inline const_iterator end() const
    {
        return allICFGNodes.end();
    }
 
    inline const SVFFunction* getParent() const
    {
        return fun;
    }
 
    inline const SVFFunction* getFunction() const
    {
        return fun;
    }
 
    inline const ICFGNode* front() const
    {
        assert(!allICFGNodes.empty() && "bb empty?");
        return allICFGNodes.front();
    }
 
    inline const ICFGNode* back() const
    {
        assert(!allICFGNodes.empty() && "bb empty?");
        return allICFGNodes.back();
    }
 
    inline const std::vector<const SVFBasicBlock*>& getSuccessors() const
    {
        return succBBs;
    }
 
    inline const std::vector<const SVFBasicBlock*>& getPredecessors() const
    {
        return predBBs;
    }
    u32_t getNumSuccessors() const
    {
        return succBBs.size();
    }
    u32_t getBBSuccessorPos(const SVFBasicBlock* succbb);
    u32_t getBBSuccessorPos(const SVFBasicBlock* succbb) const;
    u32_t getBBPredecessorPos(const SVFBasicBlock* succbb);
    u32_t getBBPredecessorPos(const SVFBasicBlock* succbb) const;
};
 
class SVFInstruction : public SVFValue
{
    friend class SVFIRWriter;
    friend class SVFIRReader;
 
private:
    const SVFBasicBlock* bb;    
    bool terminator;    
    bool ret;           
 
public:
    SVFInstruction(const SVFType* ty, const SVFBasicBlock* b, bool tm,
                   bool isRet, SVFValKind k = SVFInst);
    SVFInstruction(void) = delete;
 
    static inline bool classof(const SVFValue *node)
    {
        return node->getKind() == SVFInst ||
               node->getKind() == SVFCall ||
               node->getKind() == SVFVCall;
    }
 
    inline const SVFBasicBlock* getParent() const
    {
        return bb;
    }
 
    inline const SVFFunction* getFunction() const
    {
        return bb->getParent();
    }
 
    inline bool isRetInst() const
    {
        return ret;
    }
};
 
class SVFCallInst : public SVFInstruction
{
    friend class SVFIRWriter;
    friend class SVFIRReader;
    friend class LLVMModuleSet;
    friend class SVFIRBuilder;
 
private:
    std::vector<const SVFValue*> args;
    bool varArg;
    const SVFValue* calledVal;
 
protected:
    inline void addArgument(const SVFValue* a)
    {
        args.push_back(a);
    }
    inline void setCalledOperand(const SVFValue* v)
    {
        calledVal = v;
    }
 
public:
    SVFCallInst(const SVFType* ty, const SVFBasicBlock* b, bool va, bool tm, SVFValKind k = SVFCall) :
        SVFInstruction(ty, b, tm, false, k), varArg(va), calledVal(nullptr)
    {
    }
    SVFCallInst(void) = delete;
 
    static inline bool classof(const SVFValue *node)
    {
        return node->getKind() == SVFCall || node->getKind() == SVFVCall;
    }
    static inline bool classof(const SVFInstruction *node)
    {
        return node->getKind() == SVFCall || node->getKind() == SVFVCall;
    }
    inline u32_t arg_size() const
    {
        return args.size();
    }
    inline bool arg_empty() const
    {
        return args.empty();
    }
    inline const SVFValue* getArgOperand(u32_t i) const
    {
        assert(i < arg_size() && "out of bound access of the argument");
        return args[i];
    }
    inline u32_t getNumArgOperands() const
    {
        return arg_size();
    }
    inline const SVFValue* getCalledOperand() const
    {
        return calledVal;
    }
    inline bool isVarArg() const
    {
        return varArg;
    }
    inline const SVFFunction* getCalledFunction() const
    {
        return SVFUtil::dyn_cast<SVFFunction>(calledVal);
    }
    inline  const SVFFunction* getCaller() const
    {
        return getFunction();
    }
};
 
class SVFConstant : public SVFValue
{
    friend class SVFIRWriter;
    friend class SVFIRReader;
public:
    SVFConstant(const SVFType* ty, SVFValKind k = SVFConst): SVFValue(ty, k)
    {
    }
    SVFConstant() = delete;
 
    static inline bool classof(const SVFValue *node)
    {
        return node->getKind() == SVFConst ||
               node->getKind() == SVFGlob ||
               node->getKind() == SVFConstData ||
               node->getKind() == SVFConstInt ||
               node->getKind() == SVFConstFP ||
               node->getKind() == SVFNullPtr ||
               node->getKind() == SVFBlackHole;
    }
 
};
 
class SVFGlobalValue : public SVFConstant
{
    friend class SVFIRWriter;
    friend class SVFIRReader;
    friend class LLVMModuleSet;
 
private:
    const SVFValue* realDefGlobal;  
 
protected:
    inline void setDefGlobalForMultipleModule(const SVFValue* defg)
    {
        realDefGlobal = defg;
    }
 
public:
    SVFGlobalValue(const SVFType* ty): SVFConstant(ty, SVFValue::SVFGlob), realDefGlobal(nullptr)
    {
    }
    SVFGlobalValue(std::string&& name, const SVFType* ty) : SVFGlobalValue(ty)
    {
        setName(std::move(name));
    }
    SVFGlobalValue() = delete;
 
    inline const SVFValue* getDefGlobalForMultipleModule() const
    {
        if(realDefGlobal==nullptr)
            return this;
        return realDefGlobal;
    }
    static inline bool classof(const SVFValue *node)
    {
        return node->getKind() == SVFGlob;
    }
    static inline bool classof(const SVFConstant *node)
    {
        return node->getKind() == SVFGlob;
    }
};
 
class SVFArgument : public SVFValue
{
    friend class SVFIRWriter;
    friend class SVFIRReader;
private:
    const SVFFunction* fun;
    u32_t argNo;
    bool uncalled;
public:
    SVFArgument(const SVFType* ty, const SVFFunction* fun, u32_t argNo,
                bool uncalled)
        : SVFValue(ty, SVFValue::SVFArg), fun(fun), argNo(argNo),
          uncalled(uncalled)
    {
    }
    SVFArgument() = delete;
 
    inline const SVFFunction* getParent() const
    {
        return fun;
    }
 
    inline u32_t getArgNo() const
    {
        return argNo;
    }
 
    inline bool isArgOfUncalledFunction() const
    {
        return uncalled;
    }
 
    static inline bool classof(const SVFValue *node)
    {
        return node->getKind() == SVFArg;
    }
};
 
class SVFConstantData : public SVFConstant
{
    friend class SVFIRWriter;
    friend class SVFIRReader;
public:
    SVFConstantData(const SVFType* ty, SVFValKind k = SVFConstData)
        : SVFConstant(ty, k)
    {
    }
    SVFConstantData() = delete;
 
    static inline bool classof(const SVFValue *node)
    {
        return node->getKind() == SVFConstData ||
               node->getKind() == SVFConstInt ||
               node->getKind() == SVFConstFP ||
               node->getKind() == SVFNullPtr ||
               node->getKind() == SVFBlackHole;
    }
    static inline bool classof(const SVFConstantData *node)
    {
        return node->getKind() == SVFConstData ||
               node->getKind() == SVFConstInt ||
               node->getKind() == SVFConstFP ||
               node->getKind() == SVFNullPtr ||
               node->getKind() == SVFBlackHole;
    }
};
 
class SVFConstantInt : public SVFConstantData
{
    friend class SVFIRWriter;
    friend class SVFIRReader;
private:
    u64_t zval;
    s64_t sval;
public:
    SVFConstantInt(const SVFType* ty, u64_t z, s64_t s)
        : SVFConstantData(ty, SVFValue::SVFConstInt), zval(z), sval(s)
    {
    }
    SVFConstantInt() = delete;
 
    static inline bool classof(const SVFValue *node)
    {
        return node->getKind() == SVFConstInt;
    }
    static inline bool classof(const SVFConstantData *node)
    {
        return node->getKind() == SVFConstInt;
    }
    //  Return the constant as a 64-bit unsigned integer value after it has been zero extended as appropriate for the type of this constant.
    inline u64_t getZExtValue () const
    {
        return zval;
    }
    // Return the constant as a 64-bit integer value after it has been sign extended as appropriate for the type of this constant
    inline s64_t getSExtValue () const
    {
        return sval;
    }
};
 
class SVFConstantFP : public SVFConstantData
{
    friend class SVFIRWriter;
    friend class SVFIRReader;
private:
    float dval;
public:
    SVFConstantFP(const SVFType* ty, double d)
        : SVFConstantData(ty, SVFValue::SVFConstFP), dval(d)
    {
    }
    SVFConstantFP() = delete;
 
    inline double getFPValue () const
    {
        return dval;
    }
    static inline bool classof(const SVFValue *node)
    {
        return node->getKind() == SVFConstFP;
    }
    static inline bool classof(const SVFConstantData *node)
    {
        return node->getKind() == SVFConstFP;
    }
};
 
class SVFConstantNullPtr : public SVFConstantData
{
    friend class SVFIRWriter;
    friend class SVFIRReader;
 
public:
    SVFConstantNullPtr(const SVFType* ty)
        : SVFConstantData(ty, SVFValue::SVFNullPtr)
    {
    }
    SVFConstantNullPtr() = delete;
 
    static inline bool classof(const SVFValue *node)
    {
        return node->getKind() == SVFNullPtr;
    }
    static inline bool classof(const SVFConstantData *node)
    {
        return node->getKind() == SVFNullPtr;
    }
};
 
class SVFBlackHoleValue : public SVFConstantData
{
    friend class SVFIRWriter;
    friend class SVFIRReader;
 
public:
    SVFBlackHoleValue(const SVFType* ty)
        : SVFConstantData(ty, SVFValue::SVFBlackHole)
    {
    }
    SVFBlackHoleValue() = delete;
 
    static inline bool classof(const SVFValue *node)
    {
        return node->getKind() == SVFBlackHole;
    }
    static inline bool classof(const SVFConstantData *node)
    {
        return node->getKind() == SVFBlackHole;
    }
};
 
class SVFOtherValue : public SVFValue
{
    friend class SVFIRWriter;
    friend class SVFIRReader;
public:
    SVFOtherValue(const SVFType* ty, SVFValKind k = SVFValue::SVFOther)
        : SVFValue(ty, k)
    {
    }
    SVFOtherValue() = delete;
 
    static inline bool classof(const SVFValue *node)
    {
        return node->getKind() == SVFOther || node->getKind() == SVFMetaAsValue;
    }
};
 
/*
 * This class is only for LLVM's MetadataAsValue
*/
class SVFMetadataAsValue : public SVFOtherValue
{
    friend class SVFIRWriter;
    friend class SVFIRReader;
public:
    SVFMetadataAsValue(const SVFType* ty)
        : SVFOtherValue(ty, SVFValue::SVFMetaAsValue)
    {
    }
    SVFMetadataAsValue() = delete;
 
    static inline bool classof(const SVFValue *node)
    {
        return node->getKind() == SVFMetaAsValue;
    }
    static inline bool classof(const SVFOtherValue *node)
    {
        return node->getKind() == SVFMetaAsValue;
    }
};
 
 
std::string dumpLLVMValue(const SVFValue* svfValue);
 
template <typename F, typename S>
OutStream& operator<< (OutStream &o, const std::pair<F, S> &var)
{
    o << "<" << var.first << ", " << var.second << ">";
    return o;
}
 
} // End namespace SVF
 
#endif /* INCLUDE_SVFIR_SVFVALUE_H_ */