Revert of Rebase GDBJIT interface solely on JITCodeEvent

src/heap/mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/base/atomicops.h"
 #include "src/base/bits.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
@@ skipping 244 matching lines @@
   PrintF("[%s]: %d pages, %d (%.1f%%) free\n",
          AllocationSpaceName(space->identity()), number_of_pages,
          static_cast<int>(free), static_cast<double>(free) * 100 / reserved);
 }
 
 
 bool MarkCompactCollector::StartCompaction(CompactionMode mode) {
   if (!compacting_) {
     DCHECK(evacuation_candidates_.length() == 0);
 
+#ifdef ENABLE_GDB_JIT_INTERFACE
+    // If GDBJIT interface is active disable compaction.
+    if (FLAG_gdbjit) return false;
+#endif
+
     CollectEvacuationCandidates(heap()->old_pointer_space());
     CollectEvacuationCandidates(heap()->old_data_space());
 
     if (FLAG_compact_code_space && (mode == NON_INCREMENTAL_COMPACTION ||
                                     FLAG_incremental_code_compaction)) {
       CollectEvacuationCandidates(heap()->code_space());
     } else if (FLAG_trace_fragmentation) {
       TraceFragmentation(heap()->code_space());
     }
 
@@ skipping 2936 matching lines @@
     int live_index = 0;
     for (; live_objects != 0; live_objects--) {
       Address free_end = cell_base + offsets[live_index++] * kPointerSize;
       if (free_end != free_start) {
         int size = static_cast<int>(free_end - free_start);
         if (free_space_mode == ZAP_FREE_SPACE) {
           memset(free_start, 0xcc, size);
         }
         freed_bytes = Free<parallelism>(space, free_list, free_start, size);
         max_freed_bytes = Max(freed_bytes, max_freed_bytes);
+#ifdef ENABLE_GDB_JIT_INTERFACE
+        if (FLAG_gdbjit && space->identity() == CODE_SPACE) {
+          GDBJITInterface::RemoveCodeRange(free_start, free_end);
+        }
+#endif
       }
       HeapObject* live_object = HeapObject::FromAddress(free_end);
       DCHECK(Marking::IsBlack(Marking::MarkBitFrom(live_object)));
       Map* map = live_object->synchronized_map();
       int size = live_object->SizeFromMap(map);
       if (sweeping_mode == SWEEP_AND_VISIT_LIVE_OBJECTS) {
         live_object->IterateBody(map->instance_type(), size, v);
       }
       if ((skip_list_mode == REBUILD_SKIP_LIST) && skip_list != NULL) {
         int new_region_start = SkipList::RegionNumber(free_end);
         int new_region_end =
             SkipList::RegionNumber(free_end + size - kPointerSize);
         if (new_region_start != curr_region || new_region_end != curr_region) {
           skip_list->AddObject(free_end, size);
           curr_region = new_region_end;
         }
       }
       free_start = free_end + size;
     }
     // Clear marking bits for current cell.
     *cell = 0;
   }
   if (free_start != p->area_end()) {
     int size = static_cast<int>(p->area_end() - free_start);
     if (free_space_mode == ZAP_FREE_SPACE) {
       memset(free_start, 0xcc, size);
     }
     freed_bytes = Free<parallelism>(space, free_list, free_start, size);
     max_freed_bytes = Max(freed_bytes, max_freed_bytes);
+#ifdef ENABLE_GDB_JIT_INTERFACE
+    if (FLAG_gdbjit && space->identity() == CODE_SPACE) {
+      GDBJITInterface::RemoveCodeRange(free_start, p->area_end());
+    }
+#endif
   }
   p->ResetLiveBytes();
 
   if (parallelism == MarkCompactCollector::SWEEP_IN_PARALLEL) {
     // When concurrent sweeping is active, the page will be marked after
     // sweeping by the main thread.
     p->set_parallel_sweeping(MemoryChunk::SWEEPING_FINALIZE);
   } else {
     p->SetWasSwept();
   }
@@ skipping 1155 matching lines @@
   SlotsBuffer* buffer = *buffer_address;
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 }
 }  // namespace v8::internal