src: implement runtime option --no-node-snapshot for debugging

PR-URL: https://github.com/nodejs/node/pull/28567
Refs: https://github.com/nodejs/node/issues/28558
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>

1 files changed, 15 insertions, 10 deletions

diff --git a/src/node.cc b/src/node.cc
index 371e7c9f02..ea3bc5688e 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -1052,16 +1052,21 @@ int Start(int argc, char** argv) {
 
   {
     Isolate::CreateParams params;
-    // TODO(joyeecheung): collect external references and set it in
-    // params.external_references.
-    std::vector<intptr_t> external_references = {
-        reinterpret_cast<intptr_t>(nullptr)};
-    v8::StartupData* blob = NodeMainInstance::GetEmbeddedSnapshotBlob();
-    const std::vector<size_t>* indexes =
-        NodeMainInstance::GetIsolateDataIndexes();
-    if (blob != nullptr) {
-      params.external_references = external_references.data();
-      params.snapshot_blob = blob;
+    const std::vector<size_t>* indexes = nullptr;
+    std::vector<intptr_t> external_references;
+
+    bool force_no_snapshot =
+        per_process::cli_options->per_isolate->no_node_snapshot;
+    if (!force_no_snapshot) {
+      v8::StartupData* blob = NodeMainInstance::GetEmbeddedSnapshotBlob();
+      if (blob != nullptr) {
+        // TODO(joyeecheung): collect external references and set it in
+        // params.external_references.
+        external_references.push_back(reinterpret_cast<intptr_t>(nullptr));
+        params.external_references = external_references.data();
+        params.snapshot_blob = blob;
+        indexes = NodeMainInstance::GetIsolateDataIndexes();
+      }
     }
 
     NodeMainInstance main_instance(&params,