ir: separate components out a little more

src/frontend/ir/microinstruction.cpp

@@ -0,0 +1,85 @@
+/* This file is part of the dynarmic project.
+ * Copyright (c) 2016 MerryMage
+ * This software may be used and distributed according to the terms of the GNU
+ * General Public License version 2 or any later version.
+ */
+
+#include "common/assert.h"
+#include "frontend/ir/microinstruction.h"
+
+namespace Dynarmic {
+namespace IR {
+
+Value Inst::GetArg(size_t index) const {
+    DEBUG_ASSERT(index < GetNumArgsOf(op));
+    DEBUG_ASSERT(!args[index].IsEmpty());
+
+    return args[index];
+}
+
+void Inst::SetArg(size_t index, Value value) {
+    DEBUG_ASSERT(index < GetNumArgsOf(op));
+    DEBUG_ASSERT(value.GetType() == GetArgTypeOf(op, index) || Type::Opaque == GetArgTypeOf(op, index));
+
+    if (!args[index].IsImmediate()) {
+        UndoUse(args[index]);
+    }
+    if (!value.IsImmediate()) {
+        Use(value);
+    }
+
+    args[index] = value;
+}
+
+void Inst::Invalidate() {
+    for (auto& value : args) {
+        if (!value.IsImmediate()) {
+            UndoUse(value);
+        }
+    }
+}
+
+void Inst::ReplaceUsesWith(Value& replacement) {
+    Invalidate();
+
+    op = Opcode::Identity;
+
+    if (!replacement.IsImmediate()) {
+        Use(replacement);
+    }
+
+    args[0] = replacement;
+}
+
+void Inst::Use(Value& value) {
+    value.GetInst()->use_count++;
+
+    switch (op){
+        case Opcode::GetCarryFromOp:
+            value.GetInst()->carry_inst = this;
+            break;
+        case Opcode::GetOverflowFromOp:
+            value.GetInst()->overflow_inst = this;
+            break;
+        default:
+            break;
+    }
+}
+
+void Inst::UndoUse(Value& value) {
+    value.GetInst()->use_count--;
+
+    switch (op){
+        case Opcode::GetCarryFromOp:
+            value.GetInst()->carry_inst = nullptr;
+            break;
+        case Opcode::GetOverflowFromOp:
+            value.GetInst()->overflow_inst = nullptr;
+            break;
+        default:
+            break;
+    }
+}
+
+} // namespace IR
+} // namespace Dynarmic