30 #include "stack_zero.hpp"
  31 
  32 // This function should match SharkStack::CreateStackOverflowCheck
  33 inline void ZeroStack::overflow_check(int required_words, TRAPS) {
  34   // Check the Zero stack
  35   if (available_words() < required_words) {
  36     handle_overflow(THREAD);
  37     return;
  38   }
  39 
  40   // Check the ABI stack
  41   if (abi_stack_available(THREAD) < 0) {
  42     handle_overflow(THREAD);
  43     return;
  44   }
  45 }
  46 
  47 // This method returns the amount of ABI stack available for us
  48 // to use under normal circumstances.  Note that the returned
  49 // value can be negative.
  50 inline int ZeroStack::abi_stack_available(Thread *thread) const {
  51   int stack_used = thread->stack_base() - (address) &stack_used;
  52   int stack_free = thread->stack_size() - stack_used;
  53   return stack_free - shadow_pages_size();

  54 }
  55 
  56 #endif // CPU_ZERO_VM_STACK_ZERO_INLINE_HPP

  30 #include "stack_zero.hpp"
  31 
  32 // This function should match SharkStack::CreateStackOverflowCheck
  33 inline void ZeroStack::overflow_check(int required_words, TRAPS) {
  34   // Check the Zero stack
  35   if (available_words() < required_words) {
  36     handle_overflow(THREAD);
  37     return;
  38   }
  39 
  40   // Check the ABI stack
  41   if (abi_stack_available(THREAD) < 0) {
  42     handle_overflow(THREAD);
  43     return;
  44   }
  45 }
  46 
  47 // This method returns the amount of ABI stack available for us
  48 // to use under normal circumstances.  Note that the returned
  49 // value can be negative.
  50 inline ssize_t ZeroStack::abi_stack_available(Thread *thread) const {
  51   ssize_t stack_used = thread->stack_base() - (address) &stack_used
  52     + (StackYellowPages+StackRedPages+StackShadowPages) * os::vm_page_size();
  53   ssize_t stack_free = thread->stack_size() - stack_used;
  54   return stack_free;
  55 }
  56 
  57 #endif // CPU_ZERO_VM_STACK_ZERO_INLINE_HPP