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#include "if.h"
#include "accessor.h"
#include "instrDTO.h"
#include "response.h"
#include "stage.h"
IF::IF(Stage *stage) : Stage(stage) { this->id = FETCH; }
InstrDTO *IF::advance(Response p)
{
InstrDTO *r = nullptr;
this->advance_helper();
if (this->curr_instr != nullptr && p == WAIT) {
// mutual consent
++this->pc;
r = new InstrDTO(*this->curr_instr);
delete curr_instr;
curr_instr = nullptr;
}
return r;
}
std::vector<int> IF::stage_info() {
std::vector<int> info;
if(this->curr_instr){
info.push_back(this->curr_instr->get_pc());
info.push_back(this->curr_instr->get_instr_bits());
}
return info;
}
void IF::advance_helper()
{
Response r;
int i;
signed int bits;
if (this->curr_instr == nullptr && (this->is_pipelined || this->is_empty)) {
i = this->storage->read_word(this, this->pc, bits);
r = i ? OK : STALLED;
if (r == OK) {
this->curr_instr = new InstrDTO();
this->curr_instr->set_instr_bits(bits);
this->curr_instr->set_pc(this->pc);
this->is_empty = false;
}
}
}
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