types.hh

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/*
 * Copyright (c) 2003-2005 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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#ifndef __BASE_TYPES_HH__
#define __BASE_TYPES_HH__
 
#include <inttypes.h>
 
#include <cassert>
#include <limits>
#include <memory>
#include <ostream>
#include <stdexcept>
 
namespace gem5
{
 
typedef int64_t Counter;
 
typedef uint64_t Tick;
 
const Tick MaxTick = 0xffffffffffffffffULL;
 
class Cycles
{
 
  private:
 
    uint64_t c;
 
  public:
 
    explicit constexpr Cycles(uint64_t _c) : c(_c) { }
 
    Cycles() : c(0) { }
 
    constexpr operator uint64_t() const { return c; }
 
    Cycles& operator++() { ++c; return *this; }
 
    Cycles& operator--() { assert(c != 0); --c; return *this; }
 
    Cycles& operator+=(const Cycles& cc) { c += cc.c; return *this; }
 
    constexpr bool
    operator>(const Cycles& cc) const
    {
        return c > cc.c;
    }
 
    constexpr Cycles
    operator+(const Cycles& b) const
    {
        return Cycles(c + b.c);
    }
 
    constexpr Cycles
    operator-(const Cycles& b) const
    {
        return c >= b.c ? Cycles(c - b.c) :
            throw std::invalid_argument("RHS cycle value larger than LHS");
    }
 
    constexpr Cycles
    operator <<(const int32_t shift) const
    {
        return Cycles(c << shift);
    }
 
    constexpr Cycles
    operator >>(const int32_t shift) const
    {
        return Cycles(c >> shift);
    }
 
    friend std::ostream& operator<<(std::ostream &out, const Cycles & cycles);
};
 
typedef uint64_t Addr;
 
typedef uint16_t MicroPC;
 
static const MicroPC MicroPCRomBit = 1 << (sizeof(MicroPC) * 8 - 1);
 
static inline MicroPC
romMicroPC(MicroPC upc)
{
    return upc | MicroPCRomBit;
}
 
static inline MicroPC
normalMicroPC(MicroPC upc)
{
    return upc & ~MicroPCRomBit;
}
 
static inline bool
isRomMicroPC(MicroPC upc)
{
    return MicroPCRomBit & upc;
}
 
const Addr MaxAddr = (Addr)-1;
 
using RegVal = uint64_t;
 
// Logical register index type.
using RegIndex = uint16_t;
 
using ElemIndex = uint16_t;
 
static const ElemIndex IllegalElemIndex =
    std::numeric_limits<ElemIndex>::max();
 
static inline uint32_t
floatToBits32(float val)
{
    union
    {
        float f;
        uint32_t i;
    } u;
    u.f = val;
    return u.i;
}
 
static inline uint64_t
floatToBits64(double val)
{
    union
    {
        double f;
        uint64_t i;
    } u;
    u.f = val;
    return u.i;
}
 
static inline uint64_t floatToBits(double val) { return floatToBits64(val); }
static inline uint32_t floatToBits(float val) { return floatToBits32(val); }
 
static inline float
bitsToFloat32(uint32_t val)
{
    union
    {
        float f;
        uint32_t i;
    } u;
    u.i = val;
    return u.f;
}
 
static inline double
bitsToFloat64(uint64_t val)
{
    union
    {
        double f;
        uint64_t i;
    } u;
    u.i = val;
    return u.f;
}
 
static inline double bitsToFloat(uint64_t val) { return bitsToFloat64(val); }
static inline float bitsToFloat(uint32_t val) { return bitsToFloat32(val); }
 
typedef int16_t ThreadID;
const ThreadID InvalidThreadID = (ThreadID)-1;
 
typedef int ContextID;
const ContextID InvalidContextID = (ContextID)-1;
 
typedef int16_t PortID;
const PortID InvalidPortID = (PortID)-1;
 
class FaultBase;
typedef std::shared_ptr<FaultBase> Fault;
 
// Rather than creating a shared_ptr instance and assigning it nullptr,
// we just create an alias.
constexpr decltype(nullptr) NoFault = nullptr;
 
} // namespace gem5
 
#endif // __BASE_TYPES_HH__