hotspot/src/cpu/zero/vm/stack_zero.inline.hpp

*** 23,43 ****
   *
   */
  
  // This function should match SharkStack::CreateStackOverflowCheck
  inline void ZeroStack::overflow_check(int required_words, TRAPS) {
-   JavaThread *thread = (JavaThread *) THREAD;
- 
    // Check the Zero stack
!   if (required_words > available_words()) {
      handle_overflow(THREAD);
      return;
    }
  
    // Check the ABI stack
!   address stack_top = thread->stack_base() - thread->stack_size();
!   int free_stack = ((address) &stack_top) - stack_top;
!   if (free_stack < shadow_pages_size()) {
      handle_overflow(THREAD);
      return;
    }
  }
--- 23,48 ----
   *
   */
  
  // This function should match SharkStack::CreateStackOverflowCheck
  inline void ZeroStack::overflow_check(int required_words, TRAPS) {
    // Check the Zero stack
!   if (available_words() < required_words) {
      handle_overflow(THREAD);
      return;
    }
  
    // Check the ABI stack
!   if (abi_stack_available(THREAD) < 0) {
      handle_overflow(THREAD);
      return;
    }
  }
+ 
+ // This method returns the amount of ABI stack available for us
+ // to use under normal circumstances.  Note that the returned
+ // value can be negative.
+ inline int ZeroStack::abi_stack_available(Thread *thread) const {
+   int stack_used = thread->stack_base() - (address) &stack_used;
+   int stack_free = thread->stack_size() - stack_used;
+   return stack_free - shadow_pages_size();
+ }