src: put (de)serialization code into node_snapshotable.h/cc

So that it's easier to find the corresponding code.

PR-URL: https://github.com/nodejs/node/pull/37114
Refs: https://github.com/nodejs/node/pull/36943
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>

node.gyp

@@ -636,6 +636,7 @@
         'src/node_report_module.cc',
         'src/node_report_utils.cc',
         'src/node_serdes.cc',
+        'src/node_snapshotable.cc',
         'src/node_sockaddr.cc',
         'src/node_stat_watcher.cc',
         'src/node_symbols.cc',
@@ -738,6 +739,7 @@
         'src/node_report.h',
         'src/node_revert.h',
         'src/node_root_certs.h',
+        'src/node_snapshotable.h',
         'src/node_sockaddr.h',
         'src/node_sockaddr-inl.h',
         'src/node_stat_watcher.h',

src/node_main_instance.cc

@@ -5,6 +5,7 @@
 #include "node_external_reference.h"
 #include "node_internals.h"
 #include "node_options-inl.h"
+#include "node_snapshotable.h"
 #include "node_v8_platform-inl.h"
 #include "util-inl.h"
 #if defined(LEAK_SANITIZER)
@@ -22,7 +23,6 @@ using v8::HandleScope;
 using v8::Isolate;
 using v8::Local;
 using v8::Locker;
-using v8::Object;
 
 std::unique_ptr<ExternalReferenceRegistry> NodeMainInstance::registry_ =
     nullptr;
@@ -167,18 +167,6 @@ int NodeMainInstance::Run(const EnvSerializeInfo* env_info) {
   return exit_code;
 }
 
-void DeserializeNodeInternalFields(Local<Object> holder,
-                                   int index,
-                                   v8::StartupData payload,
-                                   void* env) {
-  if (payload.raw_size == 0) {
-    holder->SetAlignedPointerInInternalField(index, nullptr);
-    return;
-  }
-  // No embedder object in the builtin snapshot yet.
-  UNREACHABLE();
-}
-
 DeleteFnPtr<Environment, FreeEnvironment>
 NodeMainInstance::CreateMainEnvironment(int* exit_code,
                                         const EnvSerializeInfo* env_info) {

src/node_snapshotable.cc

@@ -0,0 +1,39 @@
+
+#include "node_snapshotable.h"
+#include "base_object-inl.h"
+
+namespace node {
+
+using v8::Local;
+using v8::Object;
+using v8::StartupData;
+
+void DeserializeNodeInternalFields(Local<Object> holder,
+                                   int index,
+                                   v8::StartupData payload,
+                                   void* env) {
+  if (payload.raw_size == 0) {
+    holder->SetAlignedPointerInInternalField(index, nullptr);
+    return;
+  }
+  // No embedder object in the builtin snapshot yet.
+  UNREACHABLE();
+}
+
+StartupData SerializeNodeContextInternalFields(Local<Object> holder,
+                                               int index,
+                                               void* env) {
+  void* ptr = holder->GetAlignedPointerFromInternalField(index);
+  if (ptr == nullptr || ptr == env) {
+    return StartupData{nullptr, 0};
+  }
+  if (ptr == env && index == ContextEmbedderIndex::kEnvironment) {
+    return StartupData{nullptr, 0};
+  }
+
+  // No embedder objects in the builtin snapshot yet.
+  UNREACHABLE();
+  return StartupData{nullptr, 0};
+}
+
+}  // namespace node

src/node_snapshotable.h

@@ -0,0 +1,21 @@
+
+#ifndef SRC_NODE_SNAPSHOTABLE_H_
+#define SRC_NODE_SNAPSHOTABLE_H_
+
+#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
+#include "v8.h"
+namespace node {
+
+v8::StartupData SerializeNodeContextInternalFields(v8::Local<v8::Object> holder,
+                                                   int index,
+                                                   void* env);
+void DeserializeNodeInternalFields(v8::Local<v8::Object> holder,
+                                   int index,
+                                   v8::StartupData payload,
+                                   void* env);
+}  // namespace node
+
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
+#endif  // SRC_NODE_SNAPSHOTABLE_H_

tools/snapshot/snapshot_builder.cc

@@ -6,6 +6,7 @@
 #include "node_external_reference.h"
 #include "node_internals.h"
 #include "node_main_instance.h"
+#include "node_snapshotable.h"
 #include "node_v8_platform-inl.h"
 
 namespace node {
@@ -14,7 +15,6 @@ using v8::Context;
 using v8::HandleScope;
 using v8::Isolate;
 using v8::Local;
-using v8::Object;
 using v8::SnapshotCreator;
 using v8::StartupData;
 
@@ -75,22 +75,6 @@ const EnvSerializeInfo* NodeMainInstance::GetEnvSerializeInfo() {
   return ss.str();
 }
 
-static StartupData SerializeNodeContextInternalFields(Local<Object> holder,
-                                                      int index,
-                                                      void* env) {
-  void* ptr = holder->GetAlignedPointerFromInternalField(index);
-  if (ptr == nullptr || ptr == env) {
-    return StartupData{nullptr, 0};
-  }
-  if (ptr == env && index == ContextEmbedderIndex::kEnvironment) {
-    return StartupData{nullptr, 0};
-  }
-
-  // No embedder objects in the builtin snapshot yet.
-  UNREACHABLE();
-  return StartupData{nullptr, 0};
-}
-
 std::string SnapshotBuilder::Generate(
     const std::vector<std::string> args,
     const std::vector<std::string> exec_args) {