Expose a lower bound of malloc'd memory via heap statistics

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 5472 matching lines @@
 
 
 bool v8::V8::Dispose() {
   i::V8::TearDown();
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
   i::DisposeNatives();
 #endif
   return true;
 }
 
-
-HeapStatistics::HeapStatistics(): total_heap_size_(0),
-                                  total_heap_size_executable_(0),
-                                  total_physical_size_(0),
-                                  used_heap_size_(0),
-                                  heap_size_limit_(0) { }
-
+HeapStatistics::HeapStatistics()
+    : total_heap_size_(0),
+      total_heap_size_executable_(0),
+      total_physical_size_(0),
+      total_available_size_(0),
+      used_heap_size_(0),
+      heap_size_limit_(0),
+      malloced_memory_(0),
+      does_zap_garbage_(0) {}
 
 HeapSpaceStatistics::HeapSpaceStatistics(): space_name_(0),
                                             space_size_(0),
                                             space_used_size_(0),
                                             space_available_size_(0),
                                             physical_space_size_(0) { }
 
 
 HeapObjectStatistics::HeapObjectStatistics()
     : object_type_(nullptr),
@@ skipping 1876 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->total_available_size_ = heap->Available();
   heap_statistics->used_heap_size_ = heap->SizeOfObjects();
   heap_statistics->heap_size_limit_ = heap->MaxReserved();
+  heap_statistics->malloced_memory_ =
+      isolate->allocator()->GetCurrentMemoryUsage();
   heap_statistics->does_zap_garbage_ = heap->ShouldZapGarbage();
 }
 
 
 size_t Isolate::NumberOfHeapSpaces() {
   return i::LAST_SPACE - i::FIRST_SPACE + 1;
 }
 
 
 bool Isolate::GetHeapSpaceStatistics(HeapSpaceStatistics* space_statistics,
@@ skipping 1364 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8