1 files changed, 26 insertions, 3 deletions
diff --git a/qtmips_machine/registers.cpp b/qtmips_machine/registers.cpp
index 837f403..fa984fb 100644
--- a/qtmips_machine/registers.cpp
+++ b/qtmips_machine/registers.cpp
@@ -14,12 +14,21 @@ Registers::Registers() {
     this->hi = this->lo = 0;
 }
 
-std::uint32_t Registers::read_pc() {
+Registers::Registers(const Registers *orig) : Registers() {
+    this->pc = orig->read_pc();
+    for (int i = 0; i < 31; i++)
+        this->gp[i] = orig->read_gp(i);
+    this->lo = orig->read_hi_lo(false);
+    this->hi = orig->read_hi_lo(true);
+}
+
+std::uint32_t Registers::read_pc() const {
     return this->pc;
 }
 
 std::uint32_t Registers::pc_inc() {
     this->pc += 4;
+    emit pc_update(this->pc);
     return this->pc;
 }
 
@@ -27,6 +36,7 @@ std::uint32_t Registers::pc_jmp(std::int32_t offset) {
     if (offset % 4)
         throw QTMIPS_EXCEPTION(UnalignedJump, "Trying to jump by unaligned offset", QString::number(offset, 16));
     this->pc += offset;
+    emit pc_update(this->pc);
     return this->pc;
 }
 
@@ -36,7 +46,7 @@ void Registers::pc_abs_jmp(std::uint32_t address) {
     this->pc = address;
 }
 
-std::uint32_t Registers::read_gp(std::uint8_t i) {
+std::uint32_t Registers::read_gp(std::uint8_t i) const {
     SANITY_ASSERT(i < 32, QString("Trying to read from register ") + QString(i));
     if (!i) // $0 always reads as 0
         return 0;
@@ -50,7 +60,7 @@ void Registers::write_gp(std::uint8_t i, std::uint32_t value) {
     this->gp[i - 1] = value;
 }
 
-std::uint32_t Registers::read_hi_lo(bool hi) {
+std::uint32_t Registers::read_hi_lo(bool hi) const {
     if (hi)
         return this->hi;
     else
@@ -63,3 +73,16 @@ void Registers::write_hi_lo(bool hi, std::uint32_t value) {
     else
         this->lo = value;
 }
+
+bool Registers::operator ==(const Registers &c) const {
+    if (read_pc() != c.read_pc())
+        return false;
+    for (int i = 0; i < 31; i++)
+        if (read_gp(i) != c.read_gp(i))
+            return false;
+    if (read_hi_lo(false) != c.read_hi_lo(false))
+        return false;
+    if (read_hi_lo(true) != c.read_hi_lo(true))
+        return false;
+    return true;
+}