set up structure for reg alloc

include/opt/liveanalysis.h

@@ -1,4 +1,36 @@
 #pragma once
+#include "IR/IR_basic.h"
 #include "cfg.h"
+#include "tools.h"
 
-void LiveAnalysis(CFGType &cfg);
+void LiveAnalysis(CFGType &cfg);
+
+namespace opt {
+class ForceDef : public ActionItem {
+ public:
+  std::string var_full;
+  LLVMType ty;
+  ForceDef() = default;
+  void RecursivePrint(std::ostream &os) const {
+    throw std::runtime_error("ForceDef instruction is not an actual LLVM IR instruction");
+  }
+};
+class ForceUse : public ActionItem {
+ public:
+  std::string var_full;
+  ForceUse() = default;
+  void RecursivePrint(std::ostream &os) const {
+    throw std::runtime_error("ForceUse instruction is not an actual LLVM IR instruction");
+  }
+};
+class LoadSpilledArgs : public ActionItem {
+ public:
+  size_t arg_id;  // [8,+inf)
+  std::string var_full;
+  LLVMType ty;
+  LoadSpilledArgs() = default;
+  void RecursivePrint(std::ostream &os) const {
+    throw std::runtime_error("LoadSpilledArgs instruction is not an actual LLVM IR instruction");
+  }
+};
+}  // namespace opt