src/hotspot/share/utilities/debug.cpp

8205199: more Linux clang compile failures
Contributed-by: <Arthur Eubanks> aeubanks@google.com, Thomas Stuefe <thomas.stuefe@gmail.com>
Reviewed-by: dholmes, kbarrett, stuefe

*** 712,746 ****
        g_assert_poison = page;
      }
    }
  }
  
! static bool store_context(const void* context) {
!   if (memcpy(&g_stored_assertion_context, context, sizeof(ucontext_t)) == false) {
!     return false;
!   }
  #if defined(__linux) && defined(PPC64)
    // on Linux ppc64, ucontext_t contains pointers into itself which have to be patched up
    //  after copying the context (see comment in sys/ucontext.h):
    *((void**) &g_stored_assertion_context.uc_mcontext.regs) = &(g_stored_assertion_context.uc_mcontext.gp_regs);
  #endif
-   return true;
  }
  
  bool handle_assert_poison_fault(const void* ucVoid, const void* faulting_address) {
    if (faulting_address == g_assert_poison) {
      // Disarm poison page.
      os::protect_memory((char*)g_assert_poison, os::vm_page_size(), os::MEM_PROT_RWX);
      // Store Context away.
      if (ucVoid) {
        const intx my_tid = os::current_thread_id();
        if (Atomic::cmpxchg(my_tid, &g_asserting_thread, (intx)0) == 0) {
!         if (store_context(ucVoid)) {
            g_assertion_context = &g_stored_assertion_context;
          }
        }
-     }
      return true;
    }
    return false;
  }
  #endif // CAN_SHOW_REGISTERS_ON_ASSERT
--- 712,742 ----
        g_assert_poison = page;
      }
    }
  }
  
! static void store_context(const void* context) {
!   memcpy(&g_stored_assertion_context, context, sizeof(ucontext_t));
  #if defined(__linux) && defined(PPC64)
    // on Linux ppc64, ucontext_t contains pointers into itself which have to be patched up
    //  after copying the context (see comment in sys/ucontext.h):
    *((void**) &g_stored_assertion_context.uc_mcontext.regs) = &(g_stored_assertion_context.uc_mcontext.gp_regs);
  #endif
  }
  
  bool handle_assert_poison_fault(const void* ucVoid, const void* faulting_address) {
    if (faulting_address == g_assert_poison) {
      // Disarm poison page.
      os::protect_memory((char*)g_assert_poison, os::vm_page_size(), os::MEM_PROT_RWX);
      // Store Context away.
      if (ucVoid) {
        const intx my_tid = os::current_thread_id();
        if (Atomic::cmpxchg(my_tid, &g_asserting_thread, (intx)0) == 0) {
!         store_context(ucVoid);
          g_assertion_context = &g_stored_assertion_context;
        }
      }
      return true;
    }
    return false;
  }
  #endif // CAN_SHOW_REGISTERS_ON_ASSERT