v8: export cpu_profiler_metadata_size in getHeapCodeStatistics

Author: theanarkh

doc/api/v8.md

@@ -41,19 +41,23 @@ added: v12.8.0
 
 * Returns: {Object}
 
-Returns an object with the following properties:
+Get statistics about code and its metadata in the heap, see V8
+`GetHeapCodeAndMetadataStatistics` API. Returns an object with the
+following properties:
 
 * `code_and_metadata_size` {number}
 * `bytecode_and_metadata_size` {number}
 * `external_script_source_size` {number}
+* `cpu_profiler_metadata_size` {number}
 
 <!-- eslint-skip -->
 
 ```js
 {
   code_and_metadata_size: 212208,
   bytecode_and_metadata_size: 161368,
-  external_script_source_size: 1410794
+  external_script_source_size: 1410794,
+  cpu_profiler_metadata_size: 0
 }
 ```
 

lib/v8.js

@@ -118,7 +118,8 @@ const {
   // Properties for heap code statistics buffer extraction.
   kCodeAndMetadataSizeIndex,
   kBytecodeAndMetadataSizeIndex,
-  kExternalScriptSourceSizeIndex
+  kExternalScriptSourceSizeIndex,
+  kCPUProfilerMetaDataSizeIndex
 } = binding;
 
 const kNumberOfHeapSpaces = kHeapSpaces.length;
@@ -212,7 +213,8 @@ function getHeapCodeStatistics() {
   return {
     code_and_metadata_size: buffer[kCodeAndMetadataSizeIndex],
     bytecode_and_metadata_size: buffer[kBytecodeAndMetadataSizeIndex],
-    external_script_source_size: buffer[kExternalScriptSourceSizeIndex]
+    external_script_source_size: buffer[kExternalScriptSourceSizeIndex],
+    cpu_profiler_metadata_size: buffer[kCPUProfilerMetaDataSizeIndex]
   };
 }
 

src/node_v8.cc

@@ -80,7 +80,8 @@ static constexpr size_t kHeapSpaceStatisticsPropertiesCount =
 #define HEAP_CODE_STATISTICS_PROPERTIES(V)                                     \
   V(0, code_and_metadata_size, kCodeAndMetadataSizeIndex)                      \
   V(1, bytecode_and_metadata_size, kBytecodeAndMetadataSizeIndex)              \
-  V(2, external_script_source_size, kExternalScriptSourceSizeIndex)
+  V(2, external_script_source_size, kExternalScriptSourceSizeIndex)            \
+  V(3, cpu_profiler_metadata_size, kCPUProfilerMetaDataSizeIndex)
 
 #define V(a, b, c) +1
 static const size_t kHeapCodeStatisticsPropertiesCount =

test/parallel/test-v8-stats.js

@@ -26,6 +26,7 @@ const heapCodeStatistics = v8.getHeapCodeStatistics();
 const heapCodeStatisticsKeys = [
   'bytecode_and_metadata_size',
   'code_and_metadata_size',
+  'cpu_profiler_metadata_size',
   'external_script_source_size'];
 assert.deepStrictEqual(Object.keys(heapCodeStatistics).sort(),
                        heapCodeStatisticsKeys);