cli: add --trace-exit cli option

It could be convenient to trace abnormal exit of the Node.js processes
that printing stacktrace on each `process.exit` call with a cli option.
This also takes effects on worker threads.

PR-URL: https://github.com/nodejs/node/pull/30516
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/test/parallel/test-trace-exit.js b/test/parallel/test-trace-exit.js
new file mode 100644
index 00000000000..237512ac273
--- /dev/null
+++ b/test/parallel/test-trace-exit.js
@@ -0,0 +1,59 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const { promisify } = require('util');
+const execFile = promisify(require('child_process').execFile);
+const { Worker, isMainThread, workerData } = require('worker_threads');
+
+const variant = process.argv[process.argv.length - 1];
+switch (true) {
+  case variant === 'main-thread': {
+    return;
+  }
+  case variant === 'main-thread-exit': {
+    return process.exit(0);
+  }
+  case variant.startsWith('worker-thread'): {
+    const worker = new Worker(__filename, { workerData: variant });
+    worker.on('error', common.mustNotCall());
+    worker.on('exit', common.mustCall((code) => {
+      assert.strictEqual(code, 0);
+    }));
+    return;
+  }
+  case !isMainThread: {
+    if (workerData === 'worker-thread-exit') {
+      process.exit(0);
+    }
+    return;
+  }
+}
+
+(async function() {
+  for (const { execArgv, variant, warnings } of [
+    { execArgv: ['--trace-exit'], variant: 'main-thread-exit', warnings: 1 },
+    { execArgv: [], variant: 'main-thread-exit', warnings: 0 },
+    { execArgv: ['--trace-exit'], variant: 'main-thread', warnings: 0 },
+    { execArgv: [], variant: 'main-thread', warnings: 0 },
+    { execArgv: ['--trace-exit'], variant: 'worker-thread-exit', warnings: 1 },
+    { execArgv: [], variant: 'worker-thread-exit', warnings: 0 },
+    { execArgv: ['--trace-exit'], variant: 'worker-thread', warnings: 0 },
+    { execArgv: [], variant: 'worker-thread', warnings: 0 },
+  ]) {
+    const { stdout, stderr } =
+      await execFile(process.execPath, [...execArgv, __filename, variant]);
+    assert.strictEqual(stdout, '');
+    const actualWarnings =
+      stderr.match(/WARNING: Exited the environment with code 0/g);
+    if (warnings === 0) {
+      assert.strictEqual(actualWarnings, null);
+      return;
+    }
+    assert.strictEqual(actualWarnings.length, warnings);
+
+    if (variant.startsWith('worker')) {
+      const workerIds = stderr.match(/\(node:\d+, thread:\d+)/g);
+      assert.strictEqual(workerIds.length, warnings);
+    }
+  }
+})().then(common.mustCall());