From 90cd7401debe44d9938c4dca52bd2eb9384bb636 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bartek=20Iwa=C5=84czuk?= <biwanczuk@gmail.com>
Date: Sun, 29 May 2022 14:45:36 +0200
Subject: [PATCH] v8::Context::from_snapshot()

---
 src/binding.cc |  7 +++++++
 src/context.rs | 18 ++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/src/binding.cc b/src/binding.cc
index 339c6be4..5a908f68 100644
--- a/src/binding.cc
+++ b/src/binding.cc
@@ -1682,6 +1682,13 @@ void v8__Context__SetPromiseHooks(v8::Context& self, v8::Function& init_hook,
       ptr_to_local(&after_hook), ptr_to_local(&resolve_hook));
 }
 
+const v8::Context* v8__Context__FromSnapshot(v8::Isolate* isolate, 
+                                             size_t context_snapshot_index) {
+  v8::MaybeLocal<v8::Context> maybe_local = v8::Context::FromSnapshot(
+      isolate, context_snapshot_index);
+  return maybe_local_to_ptr(maybe_local);
+}
+
 const v8::String* v8__Message__Get(const v8::Message& self) {
   return local_to_ptr(self.Get());
 }
diff --git a/src/context.rs b/src/context.rs
index d086e256..e48de6ee 100644
--- a/src/context.rs
+++ b/src/context.rs
@@ -44,6 +44,10 @@ extern "C" {
     index: c_int,
     value: *mut c_void,
   );
+  fn v8__Context__FromSnapshot(
+    isolate: *mut Isolate,
+    context_snapshot_index: usize,
+  ) -> *const Context;
 }
 
 impl Context {
@@ -302,6 +306,20 @@ impl Context {
       };
     }
   }
+
+  /// Create a new context from a (non-default) context snapshot. There
+  /// is no way to provide a global object template since we do not create
+  /// a new global object from template, but we can reuse a global object.
+  pub fn from_snapshot<'a>(
+    scope: &'a mut HandleScope,
+    context_snapshot_index: usize,
+  ) -> Option<Local<'a, Context>> {
+    unsafe {
+      scope.cast_local(|sd| {
+        v8__Context__FromSnapshot(sd.get_isolate_mut(), context_snapshot_index)
+      })
+    }
+  }
 }
 
 struct ContextAnnex {