write phi elimination

include/opt/cfg.h

@@ -8,8 +8,10 @@
 using CFGNodeCollection = std::list<class CFGNodeType *>;
 class CFGNodeType {
  public:
+  // successors, predecessors, corresponding_block is provided by BuildCFGForFunction
   std::vector<CFGNodeType *> successors, predecessors;
   BlockItem *corresponding_block;
+  // the following fields are provided by user
   CFGNodeCollection dom;
   bool visited;
   CFGNodeType *idom;

include/opt/opt.h

@@ -1,2 +1,3 @@
+#include "cfg.h"
 #include "mem2reg.h"
-#include "cfg.h"
+#include "regalloc.h"

include/opt/phieliminate.h

@@ -0,0 +1,18 @@
+#pragma once
+#include "IR/IR_basic.h"
+#include "cfg.h"
+
+namespace opt {
+class MoveInstruct : public ActionItem {
+ public:
+  std::string src_full;
+  std::string dest_full;
+  MoveInstruct() = default;
+  void RecursivePrint(std::ostream &os) const {
+    throw std::runtime_error("Move instruction is not an actual LLVM IR instruction");
+  }
+};
+}  // namespace opt
+
+
+std::shared_ptr<ModuleItem> PhiEliminate(std::shared_ptr<ModuleItem> src);

include/opt/regalloc.h

@@ -0,0 +1,2 @@
+#pragma once
+#include "phieliminate.h"