Adds support for collecting statistics about code and its metadata.

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 5486 matching lines @@
                                             space_available_size_(0),
                                             physical_space_size_(0) { }
 
 
 HeapObjectStatistics::HeapObjectStatistics()
     : object_type_(nullptr),
       object_sub_type_(nullptr),
       object_count_(0),
       object_size_(0) {}
 
+HeapCodeStatistics::HeapCodeStatistics()
+    : code_and_metadata_size_(0), bytecode_and_metadata_size_(0) {}
 
 bool v8::V8::InitializeICU(const char* icu_data_file) {
   return i::InitializeICU(icu_data_file);
 }
 
 
 void v8::V8::InitializeExternalStartupData(const char* directory_path) {
   i::InitializeExternalStartupData(directory_path);
 }
 
@@ skipping 1934 matching lines @@
     return false;
   }
 
   object_statistics->object_type_ = object_type;
   object_statistics->object_sub_type_ = object_sub_type;
   object_statistics->object_count_ = object_count;
   object_statistics->object_size_ = object_size;
   return true;
 }
 
+bool Isolate::GetHeapCodeAndMetadataStatistics(
+    HeapCodeStatistics* code_statistics) {
+  if (!code_statistics) return false;
+
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  isolate->heap()->CollectCodeStatistics();
+
+  code_statistics->code_and_metadata_size_ = isolate->code_and_metadata_size();
+  code_statistics->bytecode_and_metadata_size_ =
+      isolate->bytecode_and_metadata_size();
+  return true;
+}
 
 void Isolate::GetStackSample(const RegisterState& state, void** frames,
                              size_t frames_limit, SampleInfo* sample_info) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
 #if defined(USE_SIMULATOR)
   RegisterState regs;
   regs.pc = state.pc;
   regs.sp = state.sp;
   regs.fp = state.fp;
   i::SimulatorHelper::FillRegisters(isolate, &regs);
@@ skipping 1327 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