loop_stack
struct loop_stack *ls;
ls->next = f->loop_stack;
f->loop_stack = ls;
struct loop_stack *ls;
assert(f->loop_stack != NULL);
ls = f->loop_stack;
f->loop_stack = f->loop_stack->next;
return current_func->loop_stack->loop_bottom_lbl;
return current_func->loop_stack->continue_lbl;
struct loop_stack *next;
struct loop_stack *loop_stack;