cli: add --node-memory-debug option

Add a public switch that turns on features for debugging memory
leaks inside of Node.js core.

PR-URL: #35537
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>

Author: addaleax

doc/api/cli.md

@@ -546,6 +546,14 @@ added: v6.0.0
 
 Silence all process warnings (including deprecations).
 
+### `--node-memory-debug`
+<!-- YAML
+added: REPLACEME
+-->
+
+Enable extra debug checks for memory leaks in Node.js internals. This is
+usually only useful for developers debugging Node.js itself.
+
 ### `--openssl-config=file`
 <!-- YAML
 added: v6.9.0
@@ -1282,6 +1290,7 @@ Node.js options that are allowed are:
 * `--no-deprecation`
 * `--no-force-async-hooks-checks`
 * `--no-warnings`
+* `--node-memory-debug`
 * `--openssl-config`
 * `--pending-deprecation`
 * `--policy-integrity`

doc/node.1

@@ -278,6 +278,10 @@ These will still be enabled dynamically when `async_hooks` is enabled.
 .It Fl -no-warnings
 Silence all process warnings (including deprecations).
 .
+.It Fl -node-memory-debug
+Enable extra debug checks for memory leaks in Node.js internals. This is
+usually only useful for developers debugging Node.js itself.
+.
 .It Fl -openssl-config Ns = Ns Ar file
 Load an OpenSSL configuration file on startup.
 Among other uses, this can be used to enable FIPS-compliant crypto if Node.js is built with

src/node_options.cc

@@ -762,6 +762,12 @@ PerProcessOptionsParser::PerProcessOptionsParser(
             kAllowedInEnvironment);
 
   Insert(iop, &PerProcessOptions::get_per_isolate_options);
+
+  AddOption("--node-memory-debug",
+            "Run with extra debug checks for memory leaks in Node.js itself",
+            NoOp{}, kAllowedInEnvironment);
+  Implies("--node-memory-debug", "--debug-arraybuffer-allocations");
+  Implies("--node-memory-debug", "--verify-base-objects");
 }
 
 inline std::string RemoveBrackets(const std::string& host) {