Allow instruction trace from any stage

In reality this internally allows us to see stages even it we are not
using pipelining but that is hidden from outside simply to not confuse
user.

1 files changed, 1 insertions, 1 deletions

diff --git a/qtmips_machine/instruction.cpp b/qtmips_machine/instruction.cpp
index edb6305..4ef65a4 100644
--- a/qtmips_machine/instruction.cpp
+++ b/qtmips_machine/instruction.cpp
@@ -228,7 +228,7 @@ static const struct AluInstructionMap alu_instruction_map[] = {
 };
 #undef AIM_UNKNOWN
 
-QString Instruction::to_str() {
+QString Instruction::to_str() const {
     // TODO there are exception where some fields are zero and such so we should not print them in sych case
     if  (opcode() >= (sizeof(instruction_map) / sizeof(struct InstructionMap)))
         return QString("UNKNOWN");