static_inst.hh

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 * Authors: Steve Reinhardt
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#ifndef __CPU_STATIC_INST_HH__
#define __CPU_STATIC_INST_HH__

#include <bitset>
#include <memory>
#include <string>

#include "arch/registers.hh"
#include "arch/types.hh"
#include "base/logging.hh"
#include "base/refcnt.hh"
#include "base/types.hh"
#include "config/the_isa.hh"
#include "cpu/op_class.hh"
#include "cpu/reg_class.hh"
#include "cpu/static_inst_fwd.hh"
#include "cpu/thread_context.hh"
#include "enums/StaticInstFlags.hh"
#include "sim/byteswap.hh"

// forward declarations
class Packet;

class ExecContext;

class SymbolTable;

namespace Trace {
    class InstRecord;
}

class StaticInst : public RefCounted, public StaticInstFlags
{
  public:
    typedef TheISA::ExtMachInst ExtMachInst;

    enum {
        MaxInstSrcRegs = TheISA::MaxInstSrcRegs,        //< Max source regs
        MaxInstDestRegs = TheISA::MaxInstDestRegs       //< Max dest regs
    };

  protected:

    std::bitset<Num_Flags> flags;

    OpClass _opClass;

    int8_t _numSrcRegs;

    int8_t _numDestRegs;


    int8_t _numFPDestRegs;
    int8_t _numIntDestRegs;
    int8_t _numCCDestRegs;

    int8_t _numVecDestRegs;
    int8_t _numVecElemDestRegs;
    int8_t _numVecPredDestRegs;
  public:


    int8_t numSrcRegs()  const { return _numSrcRegs; }
    int8_t numDestRegs() const { return _numDestRegs; }
    int8_t numFPDestRegs()  const { return _numFPDestRegs; }
    int8_t numIntDestRegs() const { return _numIntDestRegs; }
    int8_t numVecDestRegs() const { return _numVecDestRegs; }
    int8_t numVecElemDestRegs() const { return _numVecElemDestRegs; }
    int8_t numVecPredDestRegs() const { return _numVecPredDestRegs; }
    int8_t numCCDestRegs() const { return _numCCDestRegs; }



    bool isNop()          const { return flags[IsNop]; }

    bool isMemRef()       const { return flags[IsMemRef]; }
    bool isLoad()         const { return flags[IsLoad]; }
    bool isStore()        const { return flags[IsStore]; }
    bool isAtomic()       const { return flags[IsAtomic]; }
    bool isStoreConditional()     const { return flags[IsStoreConditional]; }
    bool isInstPrefetch() const { return flags[IsInstPrefetch]; }
    bool isDataPrefetch() const { return flags[IsDataPrefetch]; }
    bool isPrefetch()     const { return isInstPrefetch() ||
                                         isDataPrefetch(); }

    bool isInteger()      const { return flags[IsInteger]; }
    bool isFloating()     const { return flags[IsFloating]; }
    bool isVector()       const { return flags[IsVector]; }
    bool isCC()           const { return flags[IsCC]; }

    bool isControl()      const { return flags[IsControl]; }
    bool isCall()         const { return flags[IsCall]; }
    bool isReturn()       const { return flags[IsReturn]; }
    bool isDirectCtrl()   const { return flags[IsDirectControl]; }
    bool isIndirectCtrl() const { return flags[IsIndirectControl]; }
    bool isCondCtrl()     const { return flags[IsCondControl]; }
    bool isUncondCtrl()   const { return flags[IsUncondControl]; }
    bool isCondDelaySlot() const { return flags[IsCondDelaySlot]; }

    bool isThreadSync()   const { return flags[IsThreadSync]; }
    bool isSerializing()  const { return flags[IsSerializing] ||
                                      flags[IsSerializeBefore] ||
                                      flags[IsSerializeAfter]; }
    bool isSerializeBefore() const { return flags[IsSerializeBefore]; }
    bool isSerializeAfter() const { return flags[IsSerializeAfter]; }
    bool isSquashAfter() const { return flags[IsSquashAfter]; }
    bool isMemBarrier()   const { return flags[IsMemBarrier]; }
    bool isWriteBarrier() const { return flags[IsWriteBarrier]; }
    bool isNonSpeculative() const { return flags[IsNonSpeculative]; }
    bool isQuiesce() const { return flags[IsQuiesce]; }
    bool isIprAccess() const { return flags[IsIprAccess]; }
    bool isUnverifiable() const { return flags[IsUnverifiable]; }
    bool isSyscall() const { return flags[IsSyscall]; }
    bool isMacroop() const { return flags[IsMacroop]; }
    bool isMicroop() const { return flags[IsMicroop]; }
    bool isDelayedCommit() const { return flags[IsDelayedCommit]; }
    bool isLastMicroop() const { return flags[IsLastMicroop]; }
    bool isFirstMicroop() const { return flags[IsFirstMicroop]; }
    //This flag doesn't do anything yet
    bool isMicroBranch() const { return flags[IsMicroBranch]; }

    void setFirstMicroop() { flags[IsFirstMicroop] = true; }
    void setLastMicroop() { flags[IsLastMicroop] = true; }
    void setDelayedCommit() { flags[IsDelayedCommit] = true; }
    void setFlag(Flags f) { flags[f] = true; }

    OpClass opClass()     const { return _opClass; }


    const RegId& destRegIdx(int i) const { return _destRegIdx[i]; }

    const RegId& srcRegIdx(int i)  const { return _srcRegIdx[i]; }

    static StaticInstPtr nullStaticInstPtr;

    static StaticInstPtr nopStaticInstPtr;

    const ExtMachInst machInst;

  protected:

    RegId _destRegIdx[MaxInstDestRegs];
    RegId _srcRegIdx[MaxInstSrcRegs];

    const char *mnemonic;

    mutable std::string *cachedDisassembly;

    virtual std::string
    generateDisassembly(Addr pc, const SymbolTable *symtab) const = 0;

    StaticInst(const char *_mnemonic, ExtMachInst _machInst, OpClass __opClass)
        : _opClass(__opClass), _numSrcRegs(0), _numDestRegs(0),
          _numFPDestRegs(0), _numIntDestRegs(0), _numCCDestRegs(0),
          _numVecDestRegs(0), _numVecElemDestRegs(0), _numVecPredDestRegs(0),
          machInst(_machInst), mnemonic(_mnemonic), cachedDisassembly(0)
    { }

  public:
    virtual ~StaticInst();

    virtual Fault execute(ExecContext *xc,
                          Trace::InstRecord *traceData) const = 0;

    virtual Fault initiateAcc(ExecContext *xc,
                              Trace::InstRecord *traceData) const
    {
        panic("initiateAcc not defined!");
    }

    virtual Fault completeAcc(Packet *pkt, ExecContext *xc,
                              Trace::InstRecord *traceData) const
    {
        panic("completeAcc not defined!");
    }

    virtual void advancePC(TheISA::PCState &pcState) const = 0;

    virtual StaticInstPtr fetchMicroop(MicroPC upc) const;

    virtual TheISA::PCState branchTarget(const TheISA::PCState &pc) const;

    virtual TheISA::PCState branchTarget(ThreadContext *tc) const;

    bool hasBranchTarget(const TheISA::PCState &pc, ThreadContext *tc,
                         TheISA::PCState &tgt) const;

    virtual const std::string &disassemble(Addr pc,
        const SymbolTable *symtab = 0) const;

    void printFlags(std::ostream &outs, const std::string &separator) const;

    std::string getName() { return mnemonic; }

  protected:
    template<typename T>
    size_t
    simpleAsBytes(void *buf, size_t max_size, const T &t)
    {
        size_t size = sizeof(T);
        if (size <= max_size)
            *reinterpret_cast<T *>(buf) = htole<T>(t);
        return size;
    }

  public:
    virtual size_t asBytes(void *buf, size_t max_size) { return 0; }
};

#endif // __CPU_STATIC_INST_HH__