src: make build_snapshot a per-Isolate option, rather than a global one

PR-URL: #45888
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

Author: addaleax

src/node.cc

@@ -307,7 +307,7 @@ MaybeLocal<Value> StartExecution(Environment* env, StartExecutionCallback cb) {
     return StartExecution(env, "internal/main/inspect");
   }
 
-  if (per_process::cli_options->build_snapshot) {
+  if (env->isolate_data()->options()->build_snapshot) {
     return StartExecution(env, "internal/main/mksnapshot");
   }
 
@@ -1221,7 +1221,7 @@ static ExitCode StartInternal(int argc, char** argv) {
   uv_loop_configure(uv_default_loop(), UV_METRICS_IDLE_TIME);
 
   // --build-snapshot indicates that we are in snapshot building mode.
-  if (per_process::cli_options->build_snapshot) {
+  if (per_process::cli_options->per_isolate->build_snapshot) {
     if (result->args().size() < 2) {
       fprintf(stderr,
               "--build-snapshot must be used with an entry point script.\n"

src/node_options.cc

@@ -777,6 +777,11 @@ PerIsolateOptionsParser::PerIsolateOptionsParser(
   Implies("--experimental-shadow-realm", "--harmony-shadow-realm");
   Implies("--harmony-shadow-realm", "--experimental-shadow-realm");
   ImpliesNot("--no-harmony-shadow-realm", "--experimental-shadow-realm");
+  AddOption("--build-snapshot",
+            "Generate a snapshot blob when the process exits."
+            " Currently only supported in the node_mksnapshot binary.",
+            &PerIsolateOptions::build_snapshot,
+            kDisallowedInEnvvar);
 
   Insert(eop, &PerIsolateOptions::get_per_env_options);
 }
@@ -815,11 +820,6 @@ PerProcessOptionsParser::PerProcessOptionsParser(
             "disable Object.prototype.__proto__",
             &PerProcessOptions::disable_proto,
             kAllowedInEnvvar);
-  AddOption("--build-snapshot",
-            "Generate a snapshot blob when the process exits."
-            " Currently only supported in the node_mksnapshot binary.",
-            &PerProcessOptions::build_snapshot,
-            kDisallowedInEnvvar);
   AddOption("--node-snapshot",
             "",  // It's a debug-only option.
             &PerProcessOptions::node_snapshot,

src/node_options.h

@@ -224,6 +224,7 @@ class PerIsolateOptions : public Options {
   bool report_on_signal = false;
   bool experimental_shadow_realm = false;
   std::string report_signal = "SIGUSR2";
+  bool build_snapshot = false;
   inline EnvironmentOptions* get_per_env_options();
   void CheckOptions(std::vector<std::string>* errors,
                     std::vector<std::string>* argv) override;
@@ -248,7 +249,6 @@ class PerProcessOptions : public Options {
   bool zero_fill_all_buffers = false;
   bool debug_arraybuffer_allocations = false;
   std::string disable_proto;
-  bool build_snapshot = false;
   // We enable the shared read-only heap which currently requires that the
   // snapshot used in different isolates in the same process to be the same.
   // Therefore --node-snapshot is a per-process option.

src/node_snapshotable.cc

@@ -1136,7 +1136,7 @@ ExitCode SnapshotBuilder::Generate(SnapshotData* out,
 
   // It's only possible to be kDefault in node_mksnapshot.
   SnapshotMetadata::Type snapshot_type =
-      per_process::cli_options->build_snapshot
+      per_process::cli_options->per_isolate->build_snapshot
           ? SnapshotMetadata::Type::kFullyCustomized
           : SnapshotMetadata::Type::kDefault;
 

tools/snapshot/node_mksnapshot.cc

@@ -72,7 +72,7 @@ int BuildSnapshot(int argc, char* argv[]) {
   CHECK_EQ(result->exit_code(), 0);
 
   std::string out_path;
-  if (node::per_process::cli_options->build_snapshot) {
+  if (node::per_process::cli_options->per_isolate->build_snapshot) {
     out_path = result->args()[2];
   } else {
     out_path = result->args()[1];