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#ifndef STAGE_H
#define STAGE_H
#include "definitions.h"
#include "instrDTO.h"
#include "response.h"
#include "storage.h"
#include <array>
class Stage
{
public:
/**
* Constructor.
* @param The next stage in the pipeline.
* @return A newly allocated stage object.
*/
Stage(Stage *next);
virtual ~Stage() = default;
/**
* Advances this stage by a single clock cycle.
* @param a DTO object containing various information about an instruction
* moving through the pipeline.
* @return a response, indicating whether this pipeline stage is stalled,
* busy, or done.
*/
virtual Response advance(InstrDTO &i) = 0;
protected:
/**
* The shared pool of general-purpose integer registers.
*/
static std::array<int, GPR_NUM> gprs;
/**
* The address of the currently executing instruction.
*/
static int pc;
/**
* A pointer to the next stage in the pipeline.
*/
Stage *next;
/**
* A pointer to the top-level storage device.
*/
static Storage *storage;
/**
* A flag indicating whether pipelining should be used.
*/
static bool is_pipelined;
/**
* The current clock cycle.
*/
static int clock_cycle;
};
#endif /* STAGE_H_INCLUDED */
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