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#include "stage.h"
#include "utils.h"
#include <array>
#include <deque>
Stage::Stage(Stage *next)
{
this->next = next;
this->curr_instr = nullptr;
this->status = STALLED;
this->checked_out = {};
}
Stage::~Stage() { delete this->next; };
std::array<int, GPR_NUM> Stage::gprs;
std::array<int, V_NUM> Stage::vrs;
std::deque<signed int> Stage::checked_out;
unsigned int Stage::pc;
Storage *Stage::storage;
bool Stage::is_pipelined;
int Stage::clock_cycle;
InstrDTO *Stage::advance(Response p)
{
InstrDTO *r = nullptr;
Response n;
this->advance_helper();
if (this->status == OK && p == OK) {
// mutual consent
this->curr_instr->set_time_of(this->id, this->clock_cycle);
r = new InstrDTO(*this->curr_instr);
delete curr_instr;
curr_instr = nullptr;
this->status = STALLED;
}
n = (p != OK || this->status != OK) ? STALLED : OK;
// the power of consent
this->curr_instr = this->next->advance(n);
return r;
}
void Stage::set_condition(CC c, bool v)
{
if (v)
this->gprs[3] = this->gprs[3] & 1 << c;
else
this->gprs[3] = this->gprs[3] & ~(1 << c);
}
bool Stage::get_condition(CC c) {
return (this->gprs[3] >> c) & 1;
}
signed int Stage::dereference_register(signed int v)
{
signed int r;
if (v < 0 || v >= GPR_NUM + V_NUM) {
throw std::out_of_range(string_format(
"instruction tried to access register %d, which does "
"not exist",
v));
}
r = (v >= GPR_NUM) ? this->vrs[v % GPR_NUM] : this->gprs[v];
return r;
}
bool Stage::is_checked_out(signed int r)
{
return std::find(this->checked_out.begin(), this->checked_out.end(), r) !=
this->checked_out.end();
}
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