GCUState.icc

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/*
    Copyright (c) 2002-2009 Tampere University.
 
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/**
 * @file GCUState.icc
 *
 * Inline definitions of GCUState class.
 *
 * @author Pekka Jääskeläinen 2005 (pjaaskel-no.spam-cs.tut.fi)
 * @note rating: red
 */
 
#include "SimulatorConstants.hh"
#include "SimValue.hh"
#include "Exception.hh"
 
/**
 * Returns the current program counter value.
 *
 * @return Program counter value.
 */
inline InstructionAddress&
GCUState::programCounter() {
    return programCounter_;
}
 
 
/**
 * Returns the return address register.
 *
 * @return Return address register as SimValue.
 */
inline SimValue&
GCUState::returnAddressRegister() {
    return returnAddressRegister_;
}
 
/**
 * Sets new value to program counter.
 *
 * The value is updated after the delay set by control stages.
 *
 * @param value New value.
 */
inline void
GCUState::setProgramCounter(const InstructionAddress& value) {    
    if (operationPending_ && latency_ != operationPendingTime_) {
        throw Exception(
            __FILE__, __LINE__, __func__,
            "Cannot have jumps in delay slots.");
    }
    newProgramCounter_ = value;
    operationPending_ = true;
    operationPendingTime_ = latency_;
}
 
/**
 * Sets new value to return address.
 *
 * The value is updated immediately. Takes in account the delay slot
 * length.
 */
inline void
GCUState::setReturnAddress() {
    returnAddressRegister_ = 
        programCounter_ + static_cast<SIntWord>(latency_)
            * instructionAddressIncrement_;
}
 
/**
 * Sets a wanted value to return address register immediately.
 *
 * The value is updated immediately. This is basically used to
 * initialize GCUState return address register to different value
 * than 0.
 *
 * @param value Address to set to return address register.
 */
inline void
GCUState::setReturnAddress(const InstructionAddress& value) {
    returnAddressRegister_ = value;
}