v8: add cachedDataVersionTag

Adds `v8.cachedDataVersionTag()`, which returns an integer
representing the version tag for `cachedData` for the current V8
version & flags.

PR-URL: https://github.com/nodejs/node/pull/11515
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/node_v8.cc b/src/node_v8.cc
index 7059922607..4dfb88a539 100644
--- a/src/node_v8.cc
+++ b/src/node_v8.cc
@@ -13,10 +13,12 @@ using v8::Context;
 using v8::FunctionCallbackInfo;
 using v8::HeapSpaceStatistics;
 using v8::HeapStatistics;
+using v8::Integer;
 using v8::Isolate;
 using v8::Local;
 using v8::NewStringType;
 using v8::Object;
+using v8::ScriptCompiler;
 using v8::String;
 using v8::Uint32;
 using v8::V8;
@@ -53,6 +55,15 @@ static const size_t kHeapSpaceStatisticsPropertiesCount =
 static size_t number_of_heap_spaces = 0;
 
 
+void CachedDataVersionTag(const FunctionCallbackInfo<Value>& args) {
+  Environment* env = Environment::GetCurrent(args);
+  Local<Integer> result =
+      Integer::NewFromUnsigned(env->isolate(),
+                               ScriptCompiler::CachedDataVersionTag());
+  args.GetReturnValue().Set(result);
+}
+
+
 void UpdateHeapStatisticsArrayBuffer(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
   HeapStatistics s;
@@ -99,6 +110,8 @@ void InitializeV8Bindings(Local<Object> target,
                           Local<Context> context) {
   Environment* env = Environment::GetCurrent(context);
 
+  env->SetMethod(target, "cachedDataVersionTag", CachedDataVersionTag);
+
   env->SetMethod(target,
                  "updateHeapStatisticsArrayBuffer",
                  UpdateHeapStatisticsArrayBuffer);