1 /*
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3  * Copyright 2010 Red Hat, Inc.
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14  * accompanied this code).
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25 
26 #ifndef CPU_ZERO_VM_STACK_ZERO_INLINE_HPP
27 #define CPU_ZERO_VM_STACK_ZERO_INLINE_HPP
28 
29 #include "runtime/thread.hpp"
30 #include "stack_zero.hpp"
31 
overflow_check(int required_words,TRAPS)32 inline void ZeroStack::overflow_check(int required_words, TRAPS) {
33   // Check the Zero stack
34   if (available_words() < required_words) {
35     handle_overflow(THREAD);
36     return;
37   }
38 
39   // Check the ABI stack
40   if (abi_stack_available(THREAD) < 0) {
41     handle_overflow(THREAD);
42     return;
43   }
44 }
45 
46 // This method returns the amount of ABI stack available for us
47 // to use under normal circumstances.  Note that the returned
48 // value can be negative.
abi_stack_available(Thread * thread) const49 inline int ZeroStack::abi_stack_available(Thread *thread) const {
50   guarantee(Thread::current() == thread, "should run in the same thread");
51   int stack_used = thread->stack_base() - (address) &stack_used
52     + (JavaThread::stack_guard_zone_size() + JavaThread::stack_shadow_zone_size());
53   int stack_free = thread->stack_size() - stack_used;
54   return stack_free;
55 }
56 
57 #endif // CPU_ZERO_VM_STACK_ZERO_INLINE_HPP
58