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#include "wb.h"
#include "accessor.h"
#include "instrDTO.h"
#include "response.h"
#include "stage.h"
WB::WB(Stage *stage) : Stage(stage) { this->id = WRITE; }
void WB::advance_helper()
{
if (this->curr_instr->get_mnemonic() != NOP &&
this->curr_instr->get_type() != INV) {
if (this->should_write())
this->write_handler();
else if (this->should_jump())
this->jump_handler();
}
this->status = OK;
}
void WB::write_handler()
{
signed int reg;
if (this->checked_out.size() < 1)
throw std::runtime_error("instruction tried to pop a register out of "
"an empty queue during writeback.");
reg = this->checked_out.front();
this->checked_out.pop_front();
this->store_register(reg, this->curr_instr->get_s1());
}
void WB::jump_handler()
{
if (this->curr_instr->get_s1() > 0) {
if (this->curr_instr->get_mnemonic() == JAL)
this->gprs[1] = this->pc + 1;
this->pc = this->curr_instr->get_s1();
this->checked_out = {};
this->next->squash();
}
}
bool WB::should_jump()
{
Type t;
t = this->curr_instr->get_type();
return t == J;
}
bool WB::should_write()
{
Mnemonic m;
Type t;
m = this->curr_instr->get_mnemonic();
t = this->curr_instr->get_type();
return (t == R || t == I) && (m != STORE && m != STOREV);
}
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