Adding V8 api to get memory statistics of spaces in V8::Heap.

src/api.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/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 6948 matching lines @@
 
 void Isolate::GetHeapStatistics(HeapStatistics* heap_statistics) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   i::Heap* heap = isolate->heap();
   heap_statistics->total_heap_size_ = heap->CommittedMemory();
   heap_statistics->total_heap_size_executable_ =
       heap->CommittedMemoryExecutable();
   heap_statistics->total_physical_size_ = heap->CommittedPhysicalMemory();
   heap_statistics->used_heap_size_ = heap->SizeOfObjects();
   heap_statistics->heap_size_limit_ = heap->MaxReserved();
+
+  HeapStatistics::SpaceStatistics new_space_stats(
+      heap->new_space()->Size(), heap->new_space()->CommittedMemory(),
+      heap->new_space()->Available());
+  heap_statistics->spaces_statistics().push_back(new_space_stats);
+
+  for (int space = i::AllocationSpace::FIRST_PAGED_SPACE;
+       space < i::AllocationSpace::LAST_PAGED_SPACE; space++) {
+    HeapStatistics::SpaceStatistics space_stats(
+        heap->paged_space(space)->Size(),

[rmcilroy, 2015/04/13 17:40:08]

This should be SizeOfObjects()

[ssid, 2015/04/14 16:59:16]

Done.

+        heap->paged_space(space)->CommittedMemory(),
+        heap->paged_space(space)->Available());
+    heap_statistics->spaces_statistics().push_back(space_stats);
+  }
+  HeapStatistics::SpaceStatistics lo_space_stats(

[rmcilroy, 2015/04/13 17:40:08]

nit - newline above

[ssid, 2015/04/14 16:59:16]

Done.

+      heap->lo_space()->Size(), heap->lo_space()->CommittedMemory(),
+      heap->lo_space()->Available());
+  heap_statistics->spaces_statistics().push_back(lo_space_stats);
 }
 
 
 void Isolate::GetStackSample(const RegisterState& state, void** frames,
                              size_t frames_limit, SampleInfo* sample_info) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   i::TickSample::GetStackSample(isolate, state, i::TickSample::kSkipCEntryFrame,
                                 frames, frames_limit, sample_info);
 }
 
@@ skipping 1100 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal