1 files changed, 14 insertions, 38 deletions

diff --git a/src/sim/stage.cc b/src/sim/stage.cc
index 48ee494..a8f3f9e 100644
--- a/src/sim/stage.cc
+++ b/src/sim/stage.cc
@@ -1,9 +1,7 @@
 #include "stage.h"
 #include "utils.h"
 #include <array>
-#include <set>
-
-static Logger *global_log = Logger::getInstance();
+#include <deque>
 
 Stage::Stage(Stage *next)
 {
@@ -16,51 +14,29 @@ Stage::~Stage() { delete this->next; };
 
 std::array<int, GPR_NUM> Stage::gprs;
 std::array<int, V_NUM> Stage::vrs;
-std::set<unsigned int> Stage::checked_out;
+std::deque<signed int> Stage::checked_out;
 unsigned int Stage::pc;
 Storage *Stage::storage;
 bool Stage::is_pipelined;
 int Stage::clock_cycle;
 
-Response Stage::check_out(unsigned int &v)
-{
-	Response r;
-	if (this->is_checked_out(v))
-		r = BLOCKED;
-	else {
-		r = OK;
-		v = this->check_out_register(v);
-	}
-	return r;
-}
-
-bool Stage::is_checked_out(unsigned int r)
-{
-	return this->checked_out.find(r) != this->checked_out.end();
-}
-
-signed int Stage::check_out_register(unsigned int v)
+signed int Stage::dereference_register(signed int v)
 {
 	signed int r;
-	this->checked_out.insert(v);
 
-	r = this->dereference_register(v);
-	return r;
-}
-
-signed int Stage::dereference_register(unsigned int v)
-{
-	signed int r;
-
-	if (v >= GPR_NUM + V_NUM) {
-		global_log->log(
-			ERROR, string_format(
-					   "instruction tried to access register %d, which does "
-					   "not exist",
-					   v));
-		exit(EXIT_FAILURE);
+	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();
+}