func::FuncOp func_op) {
  llvm::StringMap<FunctionMetadata> metadatas;
  WalkResult result = func_op.getBody().walk([&](Operation *op) {
    std::string op_host = GetHost(op);
    FunctionMetadata &func_metadata = metadatas[op_host];
    func_metadata.original_name = func_op.getName();
    func_metadata.insertion_point = ++Block::iterator(func_op);
    func_metadata.ops.push_back(op);

	opConst4u    = 0x0C /* 1 op, 4 byte const */
	opConst4s    = 0x0D /*	" signed */
	opConst8u    = 0x0E /* 1 op, 8 byte const */
	opConst8s    = 0x0F /*	" signed */
	opConstu     = 0x10 /* 1 op, LEB128 const */
	opConsts     = 0x11 /*	" signed */
	opDup        = 0x12
	opDrop       = 0x13
	opOver       = 0x14
	opPick       = 0x15 /* 1 op, 1 byte stack index */
	opSwap       = 0x16
	opRot        = 0x17
	opXderef     = 0x18