Track live instance and allocation counts for classes

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/compiler_stats.h"
 #include "vm/gc_marker.h"
 #include "vm/gc_sweeper.h"
@@ skipping 113 matching lines @@
       heap_(heap),
       pages_(NULL),
       pages_tail_(NULL),
       large_pages_(NULL),
       max_capacity_in_words_(max_capacity_in_words),
       capacity_in_words_(0),
       used_in_words_(0),
       sweeping_(false),
       page_space_controller_(FLAG_heap_growth_space_ratio,
                              FLAG_heap_growth_rate,
-                             FLAG_heap_growth_time_ratio) {
+                             FLAG_heap_growth_time_ratio),
+      gc_time_micros_(0),
+      collections_(0) {
 }
 
 
 PageSpace::~PageSpace() {
   FreePages(pages_);
   FreePages(large_pages_);
 }
 
 
 intptr_t PageSpace::LargePageSizeInWordsFor(intptr_t size) {
@@ skipping 239 matching lines @@
     page = page->next();
   }
   page = large_pages_;
   while (page != NULL) {
     page->WriteProtect(read_only);
     page = page->next();
   }
 }
 
 
+void PageSpace::PrintToJSONObject(JSONObject* object) {
+  JSONObject space(object, "old");
+  space.AddProperty("type", "PageSpace");
+  space.AddProperty("id", "heaps/old");
+  space.AddProperty("name", "PageSpace");
+  space.AddProperty("user_name", "old");
+  space.AddProperty("collections", collections());
+  space.AddProperty("used", UsedInWords() * kWordSize);
+  space.AddProperty("capacity", CapacityInWords() * kWordSize);
+  space.AddProperty("time", RoundMicrosecondsToSeconds(gc_time_micros()));
+}
+
+
 bool PageSpace::ShouldCollectCode() {
   // Try to collect code if enough time has passed since the last attempt.
   const int64_t start = OS::GetCurrentTimeMicros();
   const int64_t last_code_collection_in_us =
       page_space_controller_.last_code_collection_in_us();
 
   if ((start - last_code_collection_in_us) >
       FLAG_code_collection_interval_in_us) {
     if (FLAG_log_code_drop) {
       OS::Print("Trying to detach code.\n");
@@ skipping 222 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