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src/share/vm/runtime/stubRoutines.hpp

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rev 7970 : 8074552:  SafeFetch32 and SafeFetchN do not work in error handling
Summary: handle SafeFetch faults in secondary signal handlers
Reviewed-by: dholmes
Contributed-by: Thomas Stuefe


 441 
 442   static void arrayof_jbyte_copy     (HeapWord* src, HeapWord* dest, size_t count);
 443   static void arrayof_jshort_copy    (HeapWord* src, HeapWord* dest, size_t count);
 444   static void arrayof_jint_copy      (HeapWord* src, HeapWord* dest, size_t count);
 445   static void arrayof_jlong_copy     (HeapWord* src, HeapWord* dest, size_t count);
 446   static void arrayof_oop_copy       (HeapWord* src, HeapWord* dest, size_t count);
 447   static void arrayof_oop_copy_uninit(HeapWord* src, HeapWord* dest, size_t count);
 448 };
 449 
 450 // Safefetch allows to load a value from a location that's not known
 451 // to be valid. If the load causes a fault, the error value is returned.
 452 inline int SafeFetch32(int* adr, int errValue) {
 453   assert(StubRoutines::SafeFetch32_stub(), "stub not yet generated");
 454   return StubRoutines::SafeFetch32_stub()(adr, errValue);
 455 }
 456 inline intptr_t SafeFetchN(intptr_t* adr, intptr_t errValue) {
 457   assert(StubRoutines::SafeFetchN_stub(), "stub not yet generated");
 458   return StubRoutines::SafeFetchN_stub()(adr, errValue);
 459 }
 460 





 461 #endif // SHARE_VM_RUNTIME_STUBROUTINES_HPP



 441 
 442   static void arrayof_jbyte_copy     (HeapWord* src, HeapWord* dest, size_t count);
 443   static void arrayof_jshort_copy    (HeapWord* src, HeapWord* dest, size_t count);
 444   static void arrayof_jint_copy      (HeapWord* src, HeapWord* dest, size_t count);
 445   static void arrayof_jlong_copy     (HeapWord* src, HeapWord* dest, size_t count);
 446   static void arrayof_oop_copy       (HeapWord* src, HeapWord* dest, size_t count);
 447   static void arrayof_oop_copy_uninit(HeapWord* src, HeapWord* dest, size_t count);
 448 };
 449 
 450 // Safefetch allows to load a value from a location that's not known
 451 // to be valid. If the load causes a fault, the error value is returned.
 452 inline int SafeFetch32(int* adr, int errValue) {
 453   assert(StubRoutines::SafeFetch32_stub(), "stub not yet generated");
 454   return StubRoutines::SafeFetch32_stub()(adr, errValue);
 455 }
 456 inline intptr_t SafeFetchN(intptr_t* adr, intptr_t errValue) {
 457   assert(StubRoutines::SafeFetchN_stub(), "stub not yet generated");
 458   return StubRoutines::SafeFetchN_stub()(adr, errValue);
 459 }
 460 
 461 
 462 // returns true if SafeFetch32 and SafeFetchN can be used safely (stubroutines are already generated)
 463 inline bool CanUseSafeFetch32() { return StubRoutines::SafeFetch32_stub() ? true : false; }
 464 inline bool CanUseSafeFetchN()  { return StubRoutines::SafeFetchN_stub() ? true : false; }
 465 
 466 #endif // SHARE_VM_RUNTIME_STUBROUTINES_HPP
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