tools: refactor snapshot builder

This patch:

- Moves the snapshot building code to src/ so that we can reuse it
  later when generating custom snapshots from an entry point accepted
  by the node binary.
- Create a SnapshotData struct that incorporates all the data useful
  for a snapshot blob, including both the V8 data and the Node.js
  data.

PR-URL: https://github.com/nodejs/node/pull/38902
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/node_snapshotable.h b/src/node_snapshotable.h
index c3b82c6edc7..38da68f6d28 100644
--- a/src/node_snapshotable.h
+++ b/src/node_snapshotable.h
@@ -11,6 +11,7 @@ namespace node {
 
 class Environment;
 struct EnvSerializeInfo;
+struct SnapshotData;
 
 #define SERIALIZABLE_OBJECT_TYPES(V)                                           \
   V(fs_binding_data, fs::BindingData)                                          \
@@ -119,6 +120,15 @@ void SerializeBindingData(Environment* env,
                           EnvSerializeInfo* info);
 
 bool IsSnapshotableType(FastStringKey key);
+
+class SnapshotBuilder {
+ public:
+  static std::string Generate(const std::vector<std::string> args,
+                              const std::vector<std::string> exec_args);
+  static void Generate(SnapshotData* out,
+                       const std::vector<std::string> args,
+                       const std::vector<std::string> exec_args);
+};
 }  // namespace node
 
 #endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS