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

src/isolate.h

 // 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.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <queue>
 #include <set>
 
 #include "include/v8-debug.h"
 #include "src/allocation.h"
 #include "src/assert-scope.h"
+#include "src/base/accounting_allocator.h"
 #include "src/base/atomicops.h"
 #include "src/builtins.h"
 #include "src/cancelable-task.h"
 #include "src/contexts.h"
 #include "src/date.h"
 #include "src/execution.h"
 #include "src/frames.h"
 #include "src/futex-emulation.h"
 #include "src/global-handles.h"
 #include "src/handles.h"
 #include "src/hashmap.h"
 #include "src/heap/heap.h"
 #include "src/messages.h"
 #include "src/optimizing-compile-dispatcher.h"
 #include "src/regexp/regexp-stack.h"
+#include "src/runtime-profiler.h"
 #include "src/runtime/runtime.h"
-#include "src/runtime-profiler.h"
 #include "src/zone.h"
 
 namespace v8 {
 
 namespace base {
 class RandomNumberGenerator;
 }
 
 namespace internal {
 
@@ skipping 1070 matching lines @@
   }
 
   FutexWaitListNode* futex_wait_list_node() { return &futex_wait_list_node_; }
 
   CancelableTaskManager* cancelable_task_manager() {
     return cancelable_task_manager_;
   }
 
   interpreter::Interpreter* interpreter() const { return interpreter_; }
 
+  base::AccountingAllocator* allocator() { return &allocator_; }
+
  protected:
   explicit Isolate(bool enable_serializer);
 
  private:
   friend struct GlobalState;
   friend struct InitializeGlobalState;
   Handle<JSObject> SetUpSubregistry(Handle<JSObject> registry, Handle<Map> map,
                                     const char* name);
 
   // These fields are accessed through the API, offsets must be kept in sync
@@ skipping 120 matching lines @@
   bool capture_stack_trace_for_uncaught_exceptions_;
   int stack_trace_for_uncaught_exceptions_frame_limit_;
   StackTrace::StackTraceOptions stack_trace_for_uncaught_exceptions_options_;
   MemoryAllocator* memory_allocator_;
   KeyedLookupCache* keyed_lookup_cache_;
   ContextSlotCache* context_slot_cache_;
   DescriptorLookupCache* descriptor_lookup_cache_;
   HandleScopeData handle_scope_data_;
   HandleScopeImplementer* handle_scope_implementer_;
   UnicodeCache* unicode_cache_;
+  base::AccountingAllocator allocator_;
   Zone runtime_zone_;
   Zone interface_descriptor_zone_;
   InnerPointerToCodeCache* inner_pointer_to_code_cache_;
   GlobalHandles* global_handles_;
   EternalHandles* eternal_handles_;
   ThreadManager* thread_manager_;
   RuntimeState runtime_state_;
   Builtins builtins_;
   bool has_installed_extensions_;
   unibrow::Mapping<unibrow::Ecma262UnCanonicalize> jsregexp_uncanonicalize_;
@@ skipping 322 matching lines @@
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_