build: add --node-snapshot-main configure option

This adds a --build-snapshot runtime option which is currently only
supported by the node_mksnapshot binary, and a --node-snapshot-main
configure option that makes use it to run a custom script when
building the embedded snapshot. The idea is to have this experimental
feature in core as a configure-time feature for now, and investigate
the renaming V8 bugs before we make it available to more users via
making it a runtime option.

PR-URL: https://github.com/nodejs/node/pull/42466
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/node.cc b/src/node.cc
index e503fd9f5b4..5ba03b75407 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -495,6 +495,10 @@ MaybeLocal<Value> StartExecution(Environment* env, StartExecutionCallback cb) {
     return StartExecution(env, "internal/main/inspect");
   }
 
+  if (per_process::cli_options->build_snapshot) {
+    return StartExecution(env, "internal/main/mksnapshot");
+  }
+
   if (per_process::cli_options->print_help) {
     return StartExecution(env, "internal/main/print_help");
   }
@@ -1153,6 +1157,12 @@ int Start(int argc, char** argv) {
     return result.exit_code;
   }
 
+  if (per_process::cli_options->build_snapshot) {
+    fprintf(stderr,
+            "--build-snapshot is not yet supported in the node binary\n");
+    return 1;
+  }
+
   {
     bool use_node_snapshot =
         per_process::cli_options->per_isolate->node_snapshot;