Lazy peer API.

runtime/vm/pages.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/pages.h"
 
 #include "platform/assert.h"
 #include "vm/gc_marker.h"
 #include "vm/gc_sweeper.h"
 #include "vm/object.h"
@@ skipping 290 matching lines @@
   }
 
   page = large_pages_;
   while (page != NULL) {
     page->VisitObjects(visitor);
     page = page->next();
   }
 }
 
 
+void PageSpace::SetPeer(RawObject* raw_obj, void* peer) {
+  if (peer == NULL) {
+    peer_.erase(raw_obj);
+  } else {
+    peer_[raw_obj] = peer;
+  }
+}
+
+
+void* PageSpace::GetPeer(RawObject* raw_obj) {
+  std::map<RawObject*, void*>::iterator it = peer_.find(raw_obj);
+  return (it == peer_.end()) ? NULL : it->second;
+}
+
+
+int64_t PageSpace::PeerCount() const {
+  return static_cast<int64_t>(peer_.size());
+}
+
+
 void PageSpace::VisitObjectPointers(ObjectPointerVisitor* visitor) const {
   HeapPage* page = pages_;
   while (page != NULL) {
     page->VisitObjectPointers(visitor);
     page = page->next();
   }
 
   page = large_pages_;
   while (page != NULL) {
     page->VisitObjectPointers(visitor);
@@ skipping 57 matching lines @@
   }
 
   if (FLAG_verbose_gc) {
     OS::PrintErr("Start mark sweep for %s collection\n", gc_reason);
   }
   Timer timer(true, "MarkSweep");
   timer.Start();
   int64_t start = OS::GetCurrentTimeMillis();
 
   // Mark all reachable old-gen objects.
-  GCMarker marker(heap_);
+  GCMarker marker(heap_, &peer_);
   marker.MarkObjects(isolate, this, invoke_api_callbacks);
 
   // Reset the bump allocation page to unused.
   bump_page_ = NULL;
   // Reset the freelists and setup sweeping.
   freelist_.Reset();
   GCSweeper sweeper(heap_);
   intptr_t in_use = 0;
 
   HeapPage* prev_page = NULL;
@@ skipping 182 matching lines @@
     return 0;
   } else {
     ASSERT(total_time >= gc_time);
     int result= static_cast<int>((static_cast<double>(gc_time) /
                              static_cast<double>(total_time)) * 100);
     return result;
   }
 }
 
 }  // namespace dart