Problem with cgraph_node and FOR_EACH_BB_FN

[李宗霖 <fight1995go@xxxxxxxxx>]

Hello,

I want to print all the gimple stmt by using cgraph_node and here is my
code:

struct cgraph_node *node;
FOR_EACH_FUNCTION(node){
  struct function *target_fun = DECL_STRUCT_FUNCTION(node->decl);
  FOR_EACH_BB_FN(bb, target_fun){

and got an error message in  FOR_EACH_BB_FN(bb, target_cfun).
Is there anything I should do before this line?

Thank you.