143     gclog_or_tty->print(" VerifyBeforeGC:");
 144     Universe::verify(true);
 145   }
 146 
 147   // Verify object start arrays
 148   if (VerifyObjectStartArray &&
 149       VerifyBeforeGC) {
 150     old_gen->verify_object_start_array();
 151     perm_gen->verify_object_start_array();
 152   }
 153 
 154   heap->pre_full_gc_dump();
 155 
 156   // Filled in below to track the state of the young gen after the collection.
 157   bool eden_empty;
 158   bool survivors_empty;
 159   bool young_gen_empty;
 160 
 161   {
 162     HandleMark hm;
 163     const bool is_system_gc = gc_cause == GCCause::_java_lang_system_gc;
 164     // This is useful for debugging but don't change the output the
 165     // the customer sees.
 166     const char* gc_cause_str = "Full GC";
 167     if (is_system_gc && PrintGCDetails) {
 168       gc_cause_str = "Full GC (System)";
 169     }
 170     gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps);
 171     TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty);
 172     TraceTime t1(gc_cause_str, PrintGC, !PrintGCDetails, gclog_or_tty);
 173     TraceCollectorStats tcs(counters());
 174     TraceMemoryManagerStats tms(true /* Full GC */,gc_cause);
 175 
 176     if (TraceGen1Time) accumulated_time()->start();
 177 
 178     // Let the size policy know we're starting
 179     size_policy->major_collection_begin();
 180 
 181     // When collecting the permanent generation methodOops may be moving,
 182     // so we either have to flush all bcp data or convert it into bci.
 183     CodeCache::gc_prologue();
 184     Threads::gc_prologue();
 185     BiasedLocking::preserve_marks();
 186 
 187     // Capture heap size before collection for printing.
 188     size_t prev_used = heap->used();
 189 
 190     // Capture perm gen size before collection for sizing.
 191     size_t perm_gen_prev_used = perm_gen->used_in_bytes();
 192 

 143     gclog_or_tty->print(" VerifyBeforeGC:");
 144     Universe::verify(true);
 145   }
 146 
 147   // Verify object start arrays
 148   if (VerifyObjectStartArray &&
 149       VerifyBeforeGC) {
 150     old_gen->verify_object_start_array();
 151     perm_gen->verify_object_start_array();
 152   }
 153 
 154   heap->pre_full_gc_dump();
 155 
 156   // Filled in below to track the state of the young gen after the collection.
 157   bool eden_empty;
 158   bool survivors_empty;
 159   bool young_gen_empty;
 160 
 161   {
 162     HandleMark hm;
 163 






 164     gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps);
 165     TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty);
 166     TraceTime t1(GCCauseString("Full GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty);
 167     TraceCollectorStats tcs(counters());
 168     TraceMemoryManagerStats tms(true /* Full GC */,gc_cause);
 169 
 170     if (TraceGen1Time) accumulated_time()->start();
 171 
 172     // Let the size policy know we're starting
 173     size_policy->major_collection_begin();
 174 
 175     // When collecting the permanent generation methodOops may be moving,
 176     // so we either have to flush all bcp data or convert it into bci.
 177     CodeCache::gc_prologue();
 178     Threads::gc_prologue();
 179     BiasedLocking::preserve_marks();
 180 
 181     // Capture heap size before collection for printing.
 182     size_t prev_used = heap->used();
 183 
 184     // Capture perm gen size before collection for sizing.
 185     size_t perm_gen_prev_used = perm_gen->used_in_bytes();
 186