src: replace heap_utils.createHeapSnapshot with v8.getHeapSnapshot

Remove the internal testing utility and use the public API instead.

PR-URL: https://github.com/nodejs/node/pull/26671
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

lib/internal/test/heap.js

@@ -1,89 +0,0 @@
-'use strict';
-
-process.emitWarning(
-  'These APIs are for internal testing only. Do not use them.',
-  'internal/test/heap');
-
-const {
-  createHeapSnapshot,
-  buildEmbedderGraph
-} = internalBinding('heap_utils');
-const assert = require('internal/assert');
-
-// This is not suitable for production code. It creates a full V8 heap dump,
-// parses it as JSON, and then creates complex objects from it, leading
-// to significantly increased memory usage.
-function createJSHeapSnapshot() {
-  const dump = createHeapSnapshot();
-  const meta = dump.snapshot.meta;
-
-  const nodes =
-    readHeapInfo(dump.nodes, meta.node_fields, meta.node_types, dump.strings);
-  const edges =
-    readHeapInfo(dump.edges, meta.edge_fields, meta.edge_types, dump.strings);
-
-  for (const node of nodes) {
-    node.incomingEdges = [];
-    node.outgoingEdges = [];
-  }
-
-  let fromNodeIndex = 0;
-  let edgeIndex = 0;
-  for (const { type, name_or_index, to_node } of edges) {
-    while (edgeIndex === nodes[fromNodeIndex].edge_count) {
-      edgeIndex = 0;
-      fromNodeIndex++;
-    }
-    const toNode = nodes[to_node / meta.node_fields.length];
-    const fromNode = nodes[fromNodeIndex];
-    const edge = {
-      type,
-      to: toNode,
-      from: fromNode,
-      name: typeof name_or_index === 'string' ? name_or_index : null
-    };
-    toNode.incomingEdges.push(edge);
-    fromNode.outgoingEdges.push(edge);
-    edgeIndex++;
-  }
-
-  for (const node of nodes) {
-    assert(node.edge_count === node.outgoingEdges.length,
-           `${node.edge_count} !== ${node.outgoingEdges.length}`);
-  }
-  return nodes;
-}
-
-function readHeapInfo(raw, fields, types, strings) {
-  const items = [];
-
-  for (var i = 0; i < raw.length; i += fields.length) {
-    const item = {};
-    for (var j = 0; j < fields.length; j++) {
-      const name = fields[j];
-      let type = types[j];
-      if (Array.isArray(type)) {
-        item[name] = type[raw[i + j]];
-      } else if (name === 'name_or_index') {  // type === 'string_or_number'
-        if (item.type === 'element' || item.type === 'hidden')
-          type = 'number';
-        else
-          type = 'string';
-      }
-
-      if (type === 'string') {
-        item[name] = strings[raw[i + j]];
-      } else if (type === 'number' || type === 'node') {
-        item[name] = raw[i + j];
-      }
-    }
-    items.push(item);
-  }
-
-  return items;
-}
-
-module.exports = {
-  createJSHeapSnapshot,
-  buildEmbedderGraph
-};