TransportPipeline.cc

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/*
    Copyright (c) 2002-2009 Tampere University.
 
    This file is part of TTA-Based Codesign Environment (TCE).
 
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/**
 * @file TransportPipeline.cc
 *
 * Definition of TransportPipeline class.
 *
 * @author Jussi Nykänen 2004 (nykanen-no.spam-cs.tut.fi)
 * @author Pekka Jääskeläinen 2005,2009 (pjaaskel-no.spam-cs.tut.fi)
 * @note rating: red
 */
 
#include <vector>
 
#include "TransportPipeline.hh"
#include "SimValue.hh"
#include "FUState.hh"
#include "Operation.hh"
#include "Application.hh"
#include "OperationContext.hh"
#include "Operation.hh"
#include "GCUState.hh"
#include "SimulatorToolbox.hh"
#include "OperationPool.hh"
#include "StringTools.hh"
#include "TCEString.hh"
 
using std::vector;
using std::string;
 
/**
 * Constructor.
 *
 * @param parent Parent of the pipeline.
 */
TransportPipeline::TransportPipeline(GCUState& parent) : 
    OperationExecutor(parent), operation_(NULL), 
    context_(&parent.context()), 
    tempContext_(NULL, PC_, RA_, parent.context().branchDelayCycles()),
    parent_(parent) {
    // delete the own state registry to avoid mem leaks
    delete &tempContext_.stateRegistry();
    // share the state registry with the actual context
    tempContext_.setStateRegistry(parent.context().stateRegistry());
}
 
/**
 * Destructor.
 */
TransportPipeline::~TransportPipeline() {
    tempContext_.unsetStateRegistry();
}
 
/**
 * Returns the latency of the pipeline.
 *
 * @return The latency of the pipeline.
 */
int
TransportPipeline::latency() const {
    return 0;
}
 
/**
 * Start the execution of the operation.
 *
 * First inputs and outputs of the operation are collected in a vector.
 * Then a new operation context is created. After triggering the operation
 * the registers which values are changed are updated in parent GCU state.
 *
 * @param op Operation to be triggered.
 * @todo This can be optimized a lot.
 */
void
TransportPipeline::startOperation(Operation& op) {
 
    operation_ = &op;
    int operands = op.numberOfInputs() + op.numberOfOutputs();
    SimValue* io[32];
    assert(operands < 32);
    for (int i = 0; i < operands; ++i)
        io[i] = const_cast<SimValue*>(&(binding(i + 1).value()));
 
    // use a temporary context here as the original context points to the
    // internal program counter variables of the simulator engine,
    // which we do not want to modify in the middle of simulating 
    // a cycle
    tempContext_.programCounter() = context_->programCounter();
    tempContext_.returnAddress() = context_->returnAddress();
    tempContext_.setSaveReturnAddress(false);
    tempContext_.setUpdateProgramCounter(false);
    operation_->simulateTrigger(io, tempContext_);
 
    // If the operation is a jump or a call operation, update the program
    // counter after delay slot cycles. If a loop buffer setup op is called,
    // do not update the program counter this way.
    if (tempContext_.updateProgramCounter() && (op.isCall() || op.isBranch())) {
        parent_.setProgramCounter(tempContext_.programCounter());
    }
    if (tempContext_.saveReturnAddress()) {
        parent_.setReturnAddress();        
    }
}
 
/**
 * Nothing is done when clock cycle changes.
 */
void
TransportPipeline::advanceClock() {
}
 
/**
 * Copies OperationExecutor.
 *
 * @return The copied OperationExecutor.
 */
OperationExecutor*
TransportPipeline::copy() {
    return new TransportPipeline(*this);
}
 
/**
 * Sets the OperationContext of the pipeline.
 *
 * @param context The OperationContext.
 */
void
TransportPipeline::setContext(OperationContext& context) {
    context_ = &context;
}