src/hotspot/share/runtime/thread.cpp

rev 48401 : 8194482: Fix SIGSEGV in print_threads_compiling.

*** 2944,2955 ****
      // need to walk ciMetadata in current compile tasks to keep alive.
      CompilerThread* ct = (CompilerThread*)this;
      if (ct->env() != NULL) {
        ct->env()->metadata_do(f);
      }
!     if (ct->task() != NULL) {
!       ct->task()->metadata_do(f);
      }
    }
  }
  
  // Printing
--- 2944,2956 ----
      // need to walk ciMetadata in current compile tasks to keep alive.
      CompilerThread* ct = (CompilerThread*)this;
      if (ct->env() != NULL) {
        ct->env()->metadata_do(f);
      }
!     CompileTask* task = ct->task();
!     if (task != NULL) {
!       task->metadata_do(f);
      }
    }
  }
  
  // Printing
*** 2999,3012 ****
  #ifndef PRODUCT
    print_thread_state_on(st);
    _safepoint_state->print_on(st);
  #endif // PRODUCT
    if (is_Compiler_thread()) {
!     CompilerThread* ct = (CompilerThread*)this;
!     if (ct->task() != NULL) {
        st->print("   Compiling: ");
!       ct->task()->print(st, NULL, true, false);
      } else {
        st->print("   No compile task");
      }
      st->cr();
    }
--- 3000,3013 ----
  #ifndef PRODUCT
    print_thread_state_on(st);
    _safepoint_state->print_on(st);
  #endif // PRODUCT
    if (is_Compiler_thread()) {
!     CompileTask *task = ((CompilerThread*)this)->task();
!     if (task != NULL) {
        st->print("   Compiling: ");
!       task->print(st, NULL, true, false);
      } else {
        st->print("   No compile task");
      }
      st->cr();
    }
*** 4710,4722 ****
  
  void Threads::print_threads_compiling(outputStream* st, char* buf, int buflen) {
    ALL_JAVA_THREADS(thread) {
      if (thread->is_Compiler_thread()) {
        CompilerThread* ct = (CompilerThread*) thread;
!       if (ct->task() != NULL) {
          thread->print_name_on_error(st, buf, buflen);
!         ct->task()->print(st, NULL, true, true);
        }
      }
    }
  }
  
--- 4711,4729 ----
  
  void Threads::print_threads_compiling(outputStream* st, char* buf, int buflen) {
    ALL_JAVA_THREADS(thread) {
      if (thread->is_Compiler_thread()) {
        CompilerThread* ct = (CompilerThread*) thread;
! 
!       // Keep task in local variable for NULL check.
!       // ct->_task might be set to NULL by concurring compiler thread
!       // because it completed the compilation. The task is never freed,
!       // though, just returned to a free list.
!       CompileTask* task = ct->task();
!       if (task != NULL) {
          thread->print_name_on_error(st, buf, buflen);
!         task->print(st, NULL, true, true);
        }
      }
    }
  }